[PATCH v7 0/2] Add Intel LGM soc DMA support

[PATCH v7 0/2] Add Intel LGM soc DMA support

[Amireddy Mallikarjuna reddy]

Add DMA controller driver for Lightning Mountain(LGM) family of SoCs.

The main function of the DMA controller is the transfer of data from/to any
DPlus compliant peripheral to/from the memory. A memory to memory copy
capability can also be configured.
This ldma driver is used for configure the device and channnels for data
and control paths.

These controllers provide DMA capabilities for a variety of on-chip
devices such as SSC, HSNAND and GSWIP.

-------------
Future Plans:
-------------
LGM SOC also supports Hardware Memory Copy engine.
The role of the HW Memory copy engine is to offload memory copy operations
from the CPU.

Amireddy Mallikarjuna reddy (2):
  dt-bindings: dma: Add bindings for intel LGM SOC
  Add Intel LGM soc DMA support.

 .../devicetree/bindings/dma/intel,ldma.yaml        |  135 ++
 drivers/dma/Kconfig                                |    2 +
 drivers/dma/Makefile                               |    1 +
 drivers/dma/lgm/Kconfig                            |    9 +
 drivers/dma/lgm/Makefile                           |    2 +
 drivers/dma/lgm/lgm-dma.c                          | 1765 ++++++++++++++++++++
 include/linux/dma/lgm_dma.h                        |   27 +
 7 files changed, 1941 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/intel,ldma.yaml
 create mode 100644 drivers/dma/lgm/Kconfig
 create mode 100644 drivers/dma/lgm/Makefile
 create mode 100644 drivers/dma/lgm/lgm-dma.c
 create mode 100644 include/linux/dma/lgm_dma.h

-- 
2.11.0

[PATCH v7 0/2] Add Intel LGM soc DMA support

[Amireddy Mallikarjuna reddy]

Add DMA controller driver for Lightning Mountain(LGM) family of SoCs.

The main function of the DMA controller is the transfer of data from/to any
DPlus compliant peripheral to/from the memory. A memory to memory copy
capability can also be configured.
This ldma driver is used for configure the device and channnels for data
and control paths.

These controllers provide DMA capabilities for a variety of on-chip
devices such as SSC, HSNAND and GSWIP.

-------------
Future Plans:
-------------
LGM SOC also supports Hardware Memory Copy engine.
The role of the HW Memory copy engine is to offload memory copy operations
from the CPU.

Amireddy Mallikarjuna reddy (2):
  dt-bindings: dma: Add bindings for intel LGM SOC
  Add Intel LGM soc DMA support.

 .../devicetree/bindings/dma/intel,ldma.yaml        |  135 ++
 drivers/dma/Kconfig                                |    2 +
 drivers/dma/Makefile                               |    1 +
 drivers/dma/lgm/Kconfig                            |    9 +
 drivers/dma/lgm/Makefile                           |    2 +
 drivers/dma/lgm/lgm-dma.c                          | 1765 ++++++++++++++++++++
 include/linux/dma/lgm_dma.h                        |   27 +
 7 files changed, 1941 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/intel,ldma.yaml
 create mode 100644 drivers/dma/lgm/Kconfig
 create mode 100644 drivers/dma/lgm/Makefile
 create mode 100644 drivers/dma/lgm/lgm-dma.c
 create mode 100644 include/linux/dma/lgm_dma.h

-- 
2.11.0

[PATCH v7 1/2] dt-bindings: dma: Add bindings for intel LGM SOC

[Amireddy Mallikarjuna reddy]

Add DT bindings YAML schema for DMA controller driver
of Lightning Mountain(LGM) SoC.

Signed-off-by: Amireddy Mallikarjuna reddy <mallikarjunax.reddy@linux.intel.com>
---
v1:
- Initial version.

v2:
- Fix bot errors.

v3:
- No change.

v4:
- Address Thomas langer comments
  - use node name pattern as dma-controller as in common binding.
  - Remove "_" (underscore) in instance name.
  - Remove "port-" and "chan-" in attribute name for both 'dma-ports' & 'dma-channels' child nodes.

v5:
- Moved some of the attributes in 'dma-ports' & 'dma-channels' child nodes to dma client/consumer side as cells in 'dmas' properties.

v6:
- Add additionalProperties: false
- completely removed 'dma-ports' and 'dma-channels' child nodes.
- Moved channel dt properties to client side dmas.
- Use standard dma-channels and dma-channel-mask properties.
- Documented reset-names
- Add description for dma-cells

v7:
- modified compatible to oneof
- Reduced number of dma-cells to 3
- Fine tune the description of some properties.
---
 .../devicetree/bindings/dma/intel,ldma.yaml        | 135 +++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/intel,ldma.yaml

diff --git a/Documentation/devicetree/bindings/dma/intel,ldma.yaml b/Documentation/devicetree/bindings/dma/intel,ldma.yaml
new file mode 100644
index 000000000000..d38143932b05
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/intel,ldma.yaml
@@ -0,0 +1,135 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/intel,ldma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lightning Mountain centralized low speed DMA and high speed DMA controllers.
+
+maintainers:
+  - chuanhua.lei@intel.com
+  - mallikarjunax.reddy@intel.com
+
+allOf:
+  - $ref: "dma-controller.yaml#"
+
+properties:
+ $nodename:
+   pattern: "^dma-controller(@.*)?$"
+
+ compatible:
+  oneOf:
+   - const: intel,lgm-cdma
+   - const: intel,lgm-dma2tx
+   - const: intel,lgm-dma1rx
+   - const: intel,lgm-dma1tx
+   - const: intel,lgm-dma0tx
+   - const: intel,lgm-dma3
+   - const: intel,lgm-toe-dma30
+   - const: intel,lgm-toe-dma31
+
+ reg:
+  maxItems: 1
+
+ "#dma-cells":
+  const: 3
+  description:
+     The first cell is the peripheral's DMA request line.
+     The second cell is the peripheral's (port) number corresponding to the channel.
+     The third cell is the burst length of the channel.
+
+ dma-channels:
+  minimum: 1
+  maximum: 16
+
+ dma-channel-mask:
+  items:
+    minItems: 1
+
+ clocks:
+  maxItems: 1
+
+ resets:
+  maxItems: 1
+
+ reset-names:
+  items:
+    - const: ctrl
+
+ interrupts:
+  maxItems: 1
+
+ intel,dma-poll-cnt:
+   $ref: /schemas/types.yaml#definitions/uint32
+   description:
+     DMA descriptor polling counter is used to control the poling mechanism
+     for the descriptor fetching for all channels.
+
+ intel,dma-byte-en:
+   type: boolean
+   description:
+     DMA byte enable is only valid for DMA write(RX).
+     Byte enable(1) means DMA write will be based on the number of dwords
+     instead of the whole burst.
+
+ intel,dma-drb:
+    type: boolean
+    description:
+      DMA descriptor read back to make sure data and desc synchronization.
+
+ intel,dma-desc-in-sram:
+    type: boolean
+    description:
+       DMA descritpors in SRAM or not. Some old controllers descriptors
+       can be in DRAM or SRAM. The new ones are all in SRAM.
+
+ intel,dma-orrc:
+    $ref: /schemas/types.yaml#definitions/uint32
+    description:
+       DMA outstanding read counter value determine the number of
+       ORR-Outstanding Read Request. The maximum value is 16.
+
+ intel,dma-dburst-wr:
+    type: boolean
+    description:
+       Enable RX dynamic burst write. When it is enabled, the DMA does RX dynamic burst;
+       if it is disabled, the DMA RX will still support programmable fixed burst size of 2,4,8,16.
+       It only applies to RX DMA and memcopy DMA.
+
+required:
+ - compatible
+ - reg
+ - '#dma-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+   dma0: dma-controller@e0e00000 {
+     compatible = "intel,lgm-cdma";
+     reg = <0xe0e00000 0x1000>;
+     #dma-cells = <3>;
+     dma-channels = <16>;
+     dma-channel-mask = <0xFFFF>;
+     interrupt-parent = <&ioapic1>;
+     interrupts = <82 1>;
+     resets = <&rcu0 0x30 0>;
+     reset-names = "ctrl";
+     clocks = <&cgu0 80>;
+     intel,dma-poll-cnt = <4>;
+     intel,dma-byte-en;
+     intel,dma-drb;
+   };
+ - |
+   dma3: dma-controller@ec800000 {
+     compatible = "intel,lgm-dma3";
+     reg = <0xec800000 0x1000>;
+     clocks = <&cgu0 71>;
+     resets = <&rcu0 0x10 9>;
+     #dma-cells = <3>;
+     intel,dma-poll-cnt = <16>;
+     intel,dma-desc-in-sram;
+     intel,dma-orrc = <16>;
+     intel,dma-byte-en;
+     intel,dma-dburst-wr;
+   };
-- 
2.11.0

[PATCH v7 2/2] Add Intel LGM soc DMA support.

[Amireddy Mallikarjuna reddy]

Add DMA controller driver for Lightning Mountain(LGM) family of SoCs.

The main function of the DMA controller is the transfer of data from/to any
DPlus compliant peripheral to/from the memory. A memory to memory copy
capability can also be configured.

This ldma driver is used for configure the device and channnels for data
and control paths.

Signed-off-by: Amireddy Mallikarjuna reddy <mallikarjunax.reddy@linux.intel.com>
---
v1:
- Initial version.

v2:
- Fix device tree bot issues, correspondign driver changes done.
- Fix kerntel test robot warnings.
  --------------------------------------------------------
  >> drivers/dma/lgm/lgm-dma.c:729:5: warning: no previous prototype for function 'intel_dma_chan_desc_cfg' [-Wmissing-prototypes]
  int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base,
  ^
  drivers/dma/lgm/lgm-dma.c:729:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
  int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base,
  ^
  static
  1 warning generated.

  vim +/intel_dma_chan_desc_cfg +729 drivers/dma/lgm/lgm-dma.c

    728
  > 729 int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base,
    730                             int desc_num)
    731 {
    732         return ldma_chan_desc_cfg(to_ldma_chan(chan), desc_base, desc_num);
    733 }
    734 EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg);
    735

   Reported-by: kernel test robot <lkp@intel.com>
   ---------------------------------------------------------------

v3:
- Fix smatch warning.
  ----------------------------------------------------------------
  smatch warnings:
  drivers/dma/lgm/lgm-dma.c:1306 ldma_cfg_init() error: uninitialized symbol 'ret'.

  Reported-by: kernel test robot <lkp@intel.com>
  Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
  ----------------------------------------------------------------

v4:
- Address Thomas Langer comments in dtbinding and corresponding driver side changes.
- Driver side changes to corresponding device tree changes.

v5:
- Add changes to read 'dmas' properties and update the config properties driver side.
- Add virt_dma_desc utilizes virt-dma API.

v6:
- Driver changes corresponding to the device tree changes.
- Restructure things to have less activity with the spinlock.
- Save the slave config in dma_slave_config() and used in prepare time.
- Addressed & fixed issues related to desc_free callback _free_ up the memory.
- Addressed peter review comments.

v7:
- Change bool to tristate in Kconfig
- Explained the _initcall()
- change of_property*() to device_property_*()
- split the code to functions at version checks
- Remove the dma caller capability restrictions
- used for_each_set_bit()
- Addressed minor comments and fine tune the code.
---
 drivers/dma/Kconfig         |    2 +
 drivers/dma/Makefile        |    1 +
 drivers/dma/lgm/Kconfig     |    9 +
 drivers/dma/lgm/Makefile    |    2 +
 drivers/dma/lgm/lgm-dma.c   | 1765 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/dma/lgm_dma.h |   27 +
 6 files changed, 1806 insertions(+)
 create mode 100644 drivers/dma/lgm/Kconfig
 create mode 100644 drivers/dma/lgm/Makefile
 create mode 100644 drivers/dma/lgm/lgm-dma.c
 create mode 100644 include/linux/dma/lgm_dma.h

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index de41d7928bff..caeaf12fd524 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -737,6 +737,8 @@ source "drivers/dma/ti/Kconfig"
 
 source "drivers/dma/fsl-dpaa2-qdma/Kconfig"
 
+source "drivers/dma/lgm/Kconfig"
+
 # clients
 comment "DMA Clients"
 	depends on DMA_ENGINE
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index e60f81331d4c..0b899b076f4e 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -83,6 +83,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
 obj-$(CONFIG_ZX_DMA) += zx_dma.o
 obj-$(CONFIG_ST_FDMA) += st_fdma.o
 obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/
+obj-$(CONFIG_INTEL_LDMA) += lgm/
 
 obj-y += mediatek/
 obj-y += qcom/
diff --git a/drivers/dma/lgm/Kconfig b/drivers/dma/lgm/Kconfig
new file mode 100644
index 000000000000..bdb5b0d91afb
--- /dev/null
+++ b/drivers/dma/lgm/Kconfig
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config INTEL_LDMA
+	bool "Lightning Mountain centralized low speed DMA and high speed DMA controllers"
+	select DMA_ENGINE
+	select DMA_VIRTUAL_CHANNELS
+	help
+	  Enable support for intel Lightning Mountain SOC DMA controllers.
+	  These controllers provide DMA capabilities for a variety of on-chip
+	  devices such as SSC, HSNAND and GSWIP.
diff --git a/drivers/dma/lgm/Makefile b/drivers/dma/lgm/Makefile
new file mode 100644
index 000000000000..f318a8eff464
--- /dev/null
+++ b/drivers/dma/lgm/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_INTEL_LDMA)	+= lgm-dma.o
diff --git a/drivers/dma/lgm/lgm-dma.c b/drivers/dma/lgm/lgm-dma.c
new file mode 100644
index 000000000000..bd9bd450a50a
--- /dev/null
+++ b/drivers/dma/lgm/lgm-dma.c
@@ -0,0 +1,1765 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Lightning Mountain centralized low speed and high speed DMA controller driver
+ *
+ * Copyright (c) 2016 ~ 2020 Intel Corporation.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/dma/lgm_dma.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "../dmaengine.h"
+#include "../virt-dma.h"
+
+#define DRIVER_NAME			"lgm-ldma"
+
+#define DMA_ID				0x0008
+#define DMA_ID_REV			GENMASK(7, 0)
+#define DMA_ID_PNR			GENMASK(19, 16)
+#define DMA_ID_CHNR			GENMASK(26, 20)
+#define DMA_ID_DW_128B			BIT(27)
+#define DMA_ID_AW_36B			BIT(28)
+#define DMA_VER32			0x32
+#define DMA_VER31			0x31
+#define DMA_VER22			0x0A
+
+#define DMA_CTRL			0x0010
+#define DMA_CTRL_RST			BIT(0)
+#define DMA_CTRL_DSRAM_PATH		BIT(1)
+#define DMA_CTRL_DBURST_WR		BIT(3)
+#define DMA_CTRL_VLD_DF_ACK		BIT(4)
+#define DMA_CTRL_CH_FL			BIT(6)
+#define DMA_CTRL_DS_FOD			BIT(7)
+#define DMA_CTRL_DRB			BIT(8)
+#define DMA_CTRL_ENBE			BIT(9)
+#define DMA_CTRL_DESC_TMOUT_CNT_V31	GENMASK(27, 16)
+#define DMA_CTRL_DESC_TMOUT_EN_V31	BIT(30)
+#define DMA_CTRL_PKTARB			BIT(31)
+
+#define DMA_CPOLL			0x0014
+#define DMA_CPOLL_CNT			GENMASK(15, 4)
+#define DMA_CPOLL_EN			BIT(31)
+
+#define DMA_CS				0x0018
+#define DMA_CS_MASK			GENMASK(5, 0)
+
+#define DMA_CCTRL			0x001C
+#define DMA_CCTRL_ON			BIT(0)
+#define DMA_CCTRL_RST			BIT(1)
+#define DMA_CCTRL_CH_POLL_EN		BIT(2)
+#define DMA_CCTRL_CH_ABC		BIT(3) /* Adaptive Burst Chop */
+#define DMA_CDBA_MSB			GENMASK(7, 4)
+#define DMA_CCTRL_DIR_TX		BIT(8)
+#define DMA_CCTRL_CLASS			GENMASK(11, 9)
+#define DMA_CCTRL_CLASSH		GENMASK(19, 18)
+#define DMA_CCTRL_WR_NP_EN		BIT(21)
+#define DMA_CCTRL_PDEN			BIT(23)
+#define DMA_MAX_CLASS			(SZ_32 - 1)
+
+#define DMA_CDBA			0x0020
+#define DMA_CDLEN			0x0024
+#define DMA_CIS				0x0028
+#define DMA_CIE				0x002C
+#define DMA_CI_EOP			BIT(1)
+#define DMA_CI_DUR			BIT(2)
+#define DMA_CI_DESCPT			BIT(3)
+#define DMA_CI_CHOFF			BIT(4)
+#define DMA_CI_RDERR			BIT(5)
+#define DMA_CI_ALL							\
+	(DMA_CI_EOP | DMA_CI_DUR | DMA_CI_DESCPT | DMA_CI_CHOFF | DMA_CI_RDERR)
+
+#define DMA_PS				0x0040
+#define DMA_PCTRL			0x0044
+#define DMA_PCTRL_RXBL16		BIT(0)
+#define DMA_PCTRL_TXBL16		BIT(1)
+#define DMA_PCTRL_RXBL			GENMASK(3, 2)
+#define DMA_PCTRL_RXBL_8		3
+#define DMA_PCTRL_TXBL			GENMASK(5, 4)
+#define DMA_PCTRL_TXBL_8		3
+#define DMA_PCTRL_PDEN			BIT(6)
+#define DMA_PCTRL_RXBL32		BIT(7)
+#define DMA_PCTRL_RXENDI		GENMASK(9, 8)
+#define DMA_PCTRL_TXENDI		GENMASK(11, 10)
+#define DMA_PCTRL_TXBL32		BIT(15)
+#define DMA_PCTRL_MEM_FLUSH		BIT(16)
+
+#define DMA_IRNEN1			0x00E8
+#define DMA_IRNCR1			0x00EC
+#define DMA_IRNEN			0x00F4
+#define DMA_IRNCR			0x00F8
+#define DMA_C_DP_TICK			0x100
+#define DMA_C_DP_TICK_TIKNARB		GENMASK(15, 0)
+#define DMA_C_DP_TICK_TIKARB		GENMASK(31, 16)
+
+#define DMA_C_HDRM			0x110
+/*
+ * If header mode is set in DMA descriptor,
+ *   If bit 30 is disabled, HDR_LEN must be configured according to channel
+ *     requirement.
+ *   If bit 30 is enabled(checksum with heade mode), HDR_LEN has no need to
+ *     be configured. It will enable check sum for switch
+ * If header mode is not set in DMA descriptor,
+ *   This register setting doesn't matter
+ */
+#define DMA_C_HDRM_HDR_SUM		BIT(30)
+
+#define DMA_C_BOFF			0x120
+#define DMA_C_BOFF_BOF_LEN		GENMASK(7, 0)
+#define DMA_C_BOFF_EN			BIT(31)
+
+#define DMA_ORRC			0x190
+#define DMA_ORRC_ORRCNT			GENMASK(8, 4)
+#define DMA_ORRC_EN			BIT(31)
+
+#define DMA_C_ENDIAN			0x200
+#define DMA_C_END_DATAENDI		GENMASK(1, 0)
+#define DMA_C_END_DE_EN			BIT(7)
+#define DMA_C_END_DESENDI		GENMASK(9, 8)
+#define DMA_C_END_DES_EN		BIT(16)
+
+/* DMA controller capability */
+#define DMA_ADDR_36BIT			BIT(0)
+#define DMA_DATA_128BIT			BIT(1)
+#define DMA_CHAN_FLOW_CTL		BIT(2)
+#define DMA_DESC_FTOD			BIT(3)
+#define DMA_DESC_IN_SRAM		BIT(4)
+#define DMA_EN_BYTE_EN			BIT(5)
+#define DMA_DBURST_WR			BIT(6)
+#define DMA_VLD_FETCH_ACK		BIT(7)
+#define DMA_DFT_DRB			BIT(8)
+
+#define DMA_ORRC_MAX_CNT		(SZ_32 - 1)
+#define DMA_DFT_POLL_CNT		SZ_4
+
+#define DMA_DFT_BURST_V22		2
+#define DMA_BURSTL_8DW			8
+#define DMA_BURSTL_16DW			16
+#define DMA_BURSTL_32DW			32
+#define DMA_DFT_BURST			DMA_BURSTL_16DW
+
+#define DMA_MAX_DESC_NUM		(SZ_8K - 1)
+#define DMA_CHAN_BOFF_MAX		(SZ_256 - 1)
+
+#define DMA_DFT_ENDIAN			DMA_ENDIAN_TYPE0
+
+#define DMA_DFT_DESC_TCNT		50
+#define DMA_HDR_LEN_MAX			(SZ_16K - 1)
+
+/* DMA flags */
+#define DMA_TX_CH			BIT(0)
+#define DMA_RX_CH			BIT(1)
+#define DEVICE_ALLOC_DESC		BIT(2)
+#define CHAN_IN_USE			BIT(3)
+#define DMA_HW_DESC			BIT(4)
+
+#define DMA_CHAN_RST			1
+#define DMA_MAX_SIZE			(BIT(16) - 1)
+#define MAX_LOWER_CHANS			32
+#define MASK_LOWER_CHANS		GENMASK(4, 0)
+#define DMA_OWN				1
+#define HIGH_4_BITS			GENMASK(3, 0)
+#define DMA_DFT_DESC_NUM		1
+
+enum ldma_chan_on_off {
+	DMA_CH_OFF = 0,
+	DMA_CH_ON = 1,
+};
+
+enum ldma_pkt_drop {
+	DMA_PKT_DROP_DIS = 0,
+	DMA_PKT_DROP_EN,
+};
+
+enum ldma_endian {
+	DMA_ENDIAN_TYPE0 = 0,
+	DMA_ENDIAN_TYPE1,
+	DMA_ENDIAN_TYPE2,
+	DMA_ENDIAN_TYPE3,
+};
+
+enum {
+	DMA_TYPE_TX = 0,
+	DMA_TYPE_RX,
+	DMA_TYPE_MCPY,
+};
+
+enum ldma_port_name {
+	PORT0_SPI0 = 0,
+	PORT1_SPI1,
+	PORT2_SPI2,
+	PORT3_SPI3,
+	PORT4_HSNAND,
+	PORT5_PCM,
+};
+
+struct ldma_dev;
+struct ldma_port;
+
+struct ldma_chan {
+	struct virt_dma_chan	vchan;
+	struct ldma_port	*port; /* back pointer */
+	char			name[8]; /* Channel name */
+	int			nr; /* Channel id in hardware */
+	u32			flags; /* central way or channel based way */
+	enum ldma_chan_on_off	onoff;
+	dma_addr_t		desc_phys;
+	void			*desc_base; /* Virtual address */
+	u32			desc_cnt; /* Number of descriptors */
+	int			rst;
+	u32			hdrm_len;
+	bool			hdrm_csum;
+	u32			boff_len;
+	u32			data_endian;
+	u32			desc_endian;
+	bool			pden;
+	bool			desc_rx_np;
+	bool			data_endian_en;
+	bool			desc_endian_en;
+	bool			abc_en;
+	bool			desc_init;
+	struct dma_pool		*desc_pool; /* Descriptors pool */
+	u32			desc_num;
+	struct dw2_desc_sw	*ds;
+	struct work_struct	work;
+	struct dma_slave_config config;
+};
+
+struct ldma_port {
+	struct ldma_dev		*ldev; /* back pointer */
+	u32			portid;
+	u32			rxbl;
+	u32			txbl;
+	enum ldma_endian	rxendi;
+	enum ldma_endian	txendi;
+	enum ldma_pkt_drop	pkt_drop;
+};
+
+/* Instance specific data */
+struct ldma_inst_data {
+	struct dma_dev_ops	*ops;
+	const char	*name;
+	u32 type;
+};
+
+struct ldma_dev {
+	struct device		*dev;
+	void __iomem		*base;
+	struct reset_control	*rst;
+	struct clk		*core_clk;
+	struct dma_device	dma_dev;
+	u32			ver;
+	int			irq;
+	struct ldma_port	*ports;
+	struct ldma_chan	*chans; /* channel list on this DMA or port */
+	spinlock_t		dev_lock; /* Controller register execlusive */
+	u32			chan_nrs;
+	u32			port_nrs;
+	u32                     channels_mask;
+	u32			flags;
+	u32			pollcnt;
+	u32			orrc; /* Outstanding read count */
+	const struct ldma_inst_data *inst;
+	struct workqueue_struct *wq;
+};
+
+struct dw2_desc {
+	struct {
+		u32 len		:16;
+		u32 res0	:7;
+		u32 bofs	:2;
+		u32 res1	:3;
+		u32 eop		:1;
+		u32 sop		:1;
+		u32 c		:1;
+		u32 own		:1;
+	} __packed field;
+	u32 addr;
+} __packed __aligned(8);
+
+struct dw2_desc_sw {
+	struct virt_dma_desc	vdesc;
+	struct ldma_chan	*chan;
+	dma_addr_t		desc_phys;
+	size_t			desc_cnt;
+	size_t			size;
+	struct dw2_desc		*desc_hw;
+};
+
+struct dma_dev_ops {
+	int (*device_alloc_chan_resources)(struct dma_chan *chan);
+	void (*device_free_chan_resources)(struct dma_chan *chan);
+	int (*device_config)(struct dma_chan *chan,
+			     struct dma_slave_config *config);
+	int (*device_pause)(struct dma_chan *chan);
+	int (*device_resume)(struct dma_chan *chan);
+	int (*device_terminate_all)(struct dma_chan *chan);
+	void (*device_synchronize)(struct dma_chan *chan);
+	enum dma_status (*device_tx_status)(struct dma_chan *chan,
+					    dma_cookie_t cookie,
+					    struct dma_tx_state *txstate);
+	struct dma_async_tx_descriptor *(*device_prep_slave_sg)
+		(struct dma_chan *chan, struct scatterlist *sgl,
+		unsigned int sg_len, enum dma_transfer_direction direction,
+		unsigned long flags, void *context);
+	void (*device_issue_pending)(struct dma_chan *chan);
+};
+
+static inline void
+ldma_update_bits(struct ldma_dev *d, u32 mask, u32 val, u32 ofs)
+{
+	u32 old_val, new_val;
+
+	old_val = readl(d->base +  ofs);
+	new_val = (old_val & ~mask) | (val & mask);
+
+	if (new_val != old_val)
+		writel(new_val, d->base + ofs);
+}
+
+static inline struct ldma_chan *to_ldma_chan(struct dma_chan *chan)
+{
+	return container_of(chan, struct ldma_chan, vchan.chan);
+}
+
+static inline struct ldma_dev *to_ldma_dev(struct dma_device *dma_dev)
+{
+	return container_of(dma_dev, struct ldma_dev, dma_dev);
+}
+
+static inline struct dw2_desc_sw *to_lgm_dma_desc(struct virt_dma_desc *vdesc)
+{
+	return container_of(vdesc, struct dw2_desc_sw, vdesc);
+}
+
+static inline bool ldma_chan_tx(struct ldma_chan *c)
+{
+	return !!(c->flags & DMA_TX_CH);
+}
+
+static inline bool ldma_chan_is_hw_desc(struct ldma_chan *c)
+{
+	return !!(c->flags & DMA_HW_DESC);
+}
+
+static void ldma_dev_reset(struct ldma_dev *d)
+
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, DMA_CTRL_RST, DMA_CTRL_RST, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_pkt_arb_cfg(struct ldma_dev *d, bool enable)
+{
+	unsigned long flags;
+	u32 mask = DMA_CTRL_PKTARB;
+	u32 val = enable ? DMA_CTRL_PKTARB : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_sram_desc_cfg(struct ldma_dev *d, bool enable)
+{
+	unsigned long flags;
+	u32 mask = DMA_CTRL_DSRAM_PATH;
+	u32 val = enable ? DMA_CTRL_DSRAM_PATH : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_chan_flow_ctl_cfg(struct ldma_dev *d, bool enable)
+{
+	unsigned long flags;
+	u32 mask, val;
+
+	if (d->inst->type != DMA_TYPE_TX)
+		return;
+
+	mask = DMA_CTRL_CH_FL;
+	val = enable ? DMA_CTRL_CH_FL : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_global_polling_enable(struct ldma_dev *d)
+{
+	unsigned long flags;
+	u32 mask = DMA_CPOLL_EN | DMA_CPOLL_CNT;
+	u32 val = DMA_CPOLL_EN;
+
+	val |= FIELD_PREP(DMA_CPOLL_CNT, d->pollcnt);
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CPOLL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_desc_fetch_on_demand_cfg(struct ldma_dev *d, bool enable)
+{
+	unsigned long flags;
+	u32 mask, val;
+
+	if (d->inst->type == DMA_TYPE_MCPY)
+		return;
+
+	mask = DMA_CTRL_DS_FOD;
+	val = enable ? DMA_CTRL_DS_FOD : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_byte_enable_cfg(struct ldma_dev *d, bool enable)
+{
+	unsigned long flags;
+	u32 mask = DMA_CTRL_ENBE;
+	u32 val = enable ? DMA_CTRL_ENBE : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+/*
+ * orr_cnt >= 16, it will be 16
+ * 4 <= orr_cnt < 16, it ill be orr_cnt
+ * orr_cnt < 4, it will be 3. Minimum 3 orr supported
+ */
+static void ldma_dev_orrc_cfg(struct ldma_dev *d)
+{
+	unsigned long flags;
+	u32 val = 0;
+	u32 mask;
+
+	if (d->inst->type == DMA_TYPE_RX)
+		return;
+
+	mask = DMA_ORRC_EN | DMA_ORRC_ORRCNT;
+	if (d->orrc > 0 && d->orrc <= DMA_ORRC_MAX_CNT)
+		val = DMA_ORRC_EN | FIELD_PREP(DMA_ORRC_ORRCNT, d->orrc);
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_ORRC);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_df_tout_cfg(struct ldma_dev *d, bool enable, int tcnt)
+{
+	u32 mask = DMA_CTRL_DESC_TMOUT_CNT_V31;
+	unsigned long flags;
+	u32 val;
+
+	if (enable)
+		val = DMA_CTRL_DESC_TMOUT_EN_V31 | FIELD_PREP(DMA_CTRL_DESC_TMOUT_CNT_V31, tcnt);
+	else
+		val = 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_dburst_wr_cfg(struct ldma_dev *d, bool enable)
+{
+	unsigned long flags;
+	u32 mask, val;
+
+	if (d->inst->type != DMA_TYPE_RX && d->inst->type != DMA_TYPE_MCPY)
+		return;
+
+	mask = DMA_CTRL_DBURST_WR;
+	val = enable ? DMA_CTRL_DBURST_WR : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_vld_fetch_ack_cfg(struct ldma_dev *d, bool enable)
+{
+	unsigned long flags;
+	u32 mask, val;
+
+	if (d->inst->type != DMA_TYPE_TX)
+		return;
+
+	mask = DMA_CTRL_VLD_DF_ACK;
+	val = enable ? DMA_CTRL_VLD_DF_ACK : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_dev_drb_cfg(struct ldma_dev *d, int enable)
+{
+	unsigned long flags;
+	u32 mask = DMA_CTRL_DRB;
+	u32 val = enable ? DMA_CTRL_DRB : 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, mask, val, DMA_CTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static int ldma_dev_cfg(struct ldma_dev *d)
+{
+	bool enable;
+
+	ldma_dev_pkt_arb_cfg(d, true);
+	ldma_dev_global_polling_enable(d);
+
+	enable = !!(d->flags & DMA_DFT_DRB);
+	ldma_dev_drb_cfg(d, enable);
+
+	enable = !!(d->flags & DMA_EN_BYTE_EN);
+	ldma_dev_byte_enable_cfg(d, enable);
+
+	enable = !!(d->flags & DMA_CHAN_FLOW_CTL);
+	ldma_dev_chan_flow_ctl_cfg(d, enable);
+
+	enable = !!(d->flags & DMA_DESC_FTOD);
+	ldma_dev_desc_fetch_on_demand_cfg(d, enable);
+
+	enable = !!(d->flags & DMA_DESC_IN_SRAM);
+	ldma_dev_sram_desc_cfg(d, enable);
+
+	enable = !!(d->flags & DMA_DBURST_WR);
+	ldma_dev_dburst_wr_cfg(d, enable);
+
+	enable = !!(d->flags & DMA_VLD_FETCH_ACK);
+	ldma_dev_vld_fetch_ack_cfg(d, enable);
+
+	if (d->ver > DMA_VER22) {
+		ldma_dev_orrc_cfg(d);
+		ldma_dev_df_tout_cfg(d, true, DMA_DFT_DESC_TCNT);
+	}
+
+	dev_dbg(d->dev, "%s Controller 0x%08x configuration done\n",
+		d->inst->name, readl(d->base + DMA_CTRL));
+
+	return 0;
+}
+
+static int ldma_chan_cctrl_cfg(struct ldma_chan *c, u32 val)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 class_low, class_high;
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	reg = readl(d->base + DMA_CCTRL);
+	/* Read from hardware */
+	if (reg & DMA_CCTRL_DIR_TX)
+		c->flags |= DMA_TX_CH;
+	else
+		c->flags |= DMA_RX_CH;
+
+	/* Keep the class value unchanged */
+	class_low = FIELD_GET(DMA_CCTRL_CLASS, reg);
+	class_high = FIELD_GET(DMA_CCTRL_CLASSH, reg);
+	val &= ~DMA_CCTRL_CLASS;
+	val |= FIELD_PREP(DMA_CCTRL_CLASS, class_low);
+	val &= ~DMA_CCTRL_CLASSH;
+	val |= FIELD_PREP(DMA_CCTRL_CLASSH, class_high);
+	writel(val, d->base + DMA_CCTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+
+	return 0;
+}
+
+static void ldma_chan_irq_init(struct ldma_chan *c)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+	u32 enofs, crofs;
+	u32 cn_bit;
+
+	if (c->nr < MAX_LOWER_CHANS) {
+		enofs = DMA_IRNEN;
+		crofs = DMA_IRNCR;
+	} else {
+		enofs = DMA_IRNEN1;
+		crofs = DMA_IRNCR1;
+	}
+
+	cn_bit = BIT(c->nr & MASK_LOWER_CHANS);
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+
+	/* Clear all interrupts and disabled it */
+	writel(0, d->base + DMA_CIE);
+	writel(DMA_CI_ALL, d->base + DMA_CIS);
+
+	ldma_update_bits(d, cn_bit, 0, enofs);
+	writel(cn_bit, d->base + crofs);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void ldma_chan_set_class(struct ldma_chan *c, u32 val)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 class_val;
+
+	if (d->inst->type == DMA_TYPE_MCPY || val > DMA_MAX_CLASS)
+		return;
+
+	/* 3 bits low */
+	class_val = FIELD_PREP(DMA_CCTRL_CLASS, val & 0x7);
+	/* 2 bits high */
+	class_val |= FIELD_PREP(DMA_CCTRL_CLASSH, (val >> 3) & 0x3);
+
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH, class_val,
+			 DMA_CCTRL);
+}
+
+static int ldma_chan_on(struct ldma_chan *c)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+
+	/* If descriptors not configured, not allow to turn on channel */
+	if (WARN_ON(!c->desc_init))
+		return -EINVAL;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, DMA_CCTRL_ON, DMA_CCTRL_ON, DMA_CCTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+
+	c->onoff = DMA_CH_ON;
+
+	return 0;
+}
+
+static int ldma_chan_off(struct ldma_chan *c)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+	u32 val;
+	int ret;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, DMA_CCTRL_ON, 0, DMA_CCTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+
+	ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
+					!(val & DMA_CCTRL_ON), 0, 10000);
+	if (ret)
+		return ret;
+
+	c->onoff = DMA_CH_OFF;
+
+	return 0;
+}
+
+static void ldma_chan_desc_hw_cfg(struct ldma_chan *c, dma_addr_t desc_base,
+				  int desc_num)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	writel(lower_32_bits(desc_base), d->base + DMA_CDBA);
+
+	/* Higher 4 bits of 36 bit addressing */
+	if (IS_ENABLED(CONFIG_64BIT)) {
+		u32 hi = upper_32_bits(desc_base) & HIGH_4_BITS;
+
+		ldma_update_bits(d, DMA_CDBA_MSB,
+				 FIELD_PREP(DMA_CDBA_MSB, hi), DMA_CCTRL);
+	}
+	writel(desc_num, d->base + DMA_CDLEN);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+
+	c->desc_init = true;
+}
+
+/*
+ * Descriptor base address and data pointer must be physical address when
+ * writen to the register.
+ * This API will be used by CBM which configure hardware descriptor.
+ */
+static int ldma_chan_desc_cfg(struct ldma_chan *c, dma_addr_t desc_base,
+			      int desc_num)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+
+	if (!desc_num) {
+		dev_err(d->dev, "Channel %d must allocate descriptor first\n",
+			c->nr);
+		return -EINVAL;
+	}
+
+	if (desc_num > DMA_MAX_DESC_NUM) {
+		dev_err(d->dev, "Channel %d descriptor number out of range %d\n",
+			c->nr, desc_num);
+		return -EINVAL;
+	}
+
+	ldma_chan_desc_hw_cfg(c, desc_base, desc_num);
+
+	c->flags |= DMA_HW_DESC;
+	c->desc_cnt = desc_num;
+	c->desc_phys = desc_base;
+
+	return 0;
+}
+
+int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base,
+			    int desc_num)
+{
+	return ldma_chan_desc_cfg(to_ldma_chan(chan), desc_base, desc_num);
+}
+EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg);
+
+static int ldma_chan_reset(struct ldma_chan *c)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+	u32 val;
+	int ret;
+
+	ret = ldma_chan_off(c);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, DMA_CCTRL_RST, DMA_CCTRL_RST, DMA_CCTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+
+	ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
+					!(val & DMA_CCTRL_RST), 0, 10000);
+	if (ret)
+		return ret;
+
+	c->rst = 1;
+	c->desc_init = false;
+
+	return 0;
+}
+
+static void ldma_chan_byte_offset_cfg(struct ldma_chan *c, u32 boff_len)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 mask = DMA_C_BOFF_EN | DMA_C_BOFF_BOF_LEN;
+	u32 val;
+
+	if (boff_len > 0 && boff_len <= DMA_CHAN_BOFF_MAX)
+		val = FIELD_PREP(DMA_C_BOFF_BOF_LEN, boff_len) | DMA_C_BOFF_EN;
+	else
+		val = 0;
+
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, mask, val, DMA_C_BOFF);
+}
+
+static void ldma_chan_data_endian_cfg(struct ldma_chan *c, bool enable,
+				      u32 endian_type)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 mask = DMA_C_END_DE_EN | DMA_C_END_DATAENDI;
+	u32 val;
+
+	if (enable)
+		val = DMA_C_END_DE_EN | FIELD_PREP(DMA_C_END_DATAENDI, endian_type);
+	else
+		val = 0;
+
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
+}
+
+static void ldma_chan_desc_endian_cfg(struct ldma_chan *c, bool enable,
+				      u32 endian_type)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 mask = DMA_C_END_DES_EN | DMA_C_END_DESENDI;
+	u32 val;
+
+	if (enable)
+		val = DMA_C_END_DES_EN | FIELD_PREP(DMA_C_END_DESENDI, endian_type);
+	else
+		val = 0;
+
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
+}
+
+static void ldma_chan_hdr_mode_cfg(struct ldma_chan *c, u32 hdr_len, bool csum)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 mask, val;
+
+	/* NB, csum disabled, hdr length must be provided */
+	if (!csum && (!hdr_len || hdr_len > DMA_HDR_LEN_MAX))
+		return;
+
+	mask = DMA_C_HDRM_HDR_SUM;
+	val = DMA_C_HDRM_HDR_SUM;
+
+	if (!csum && hdr_len)
+		val = hdr_len;
+
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, mask, val, DMA_C_HDRM);
+}
+
+static void ldma_chan_rxwr_np_cfg(struct ldma_chan *c, bool enable)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 mask, val;
+
+	/* Only valid for RX channel */
+	if (ldma_chan_tx(c))
+		return;
+
+	mask = DMA_CCTRL_WR_NP_EN;
+	val = enable ? DMA_CCTRL_WR_NP_EN : 0;
+
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, mask, val, DMA_CCTRL);
+}
+
+static void ldma_chan_abc_cfg(struct ldma_chan *c, bool enable)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 mask, val;
+
+	if (d->ver < DMA_VER32 || ldma_chan_tx(c))
+		return;
+
+	mask = DMA_CCTRL_CH_ABC;
+	val = enable ? DMA_CCTRL_CH_ABC : 0;
+
+	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
+	ldma_update_bits(d, mask, val, DMA_CCTRL);
+}
+
+static int ldma_port_cfg(struct ldma_port *p)
+{
+	unsigned long flags;
+	struct ldma_dev *d;
+	u32 reg;
+
+	d = p->ldev;
+	reg = FIELD_PREP(DMA_PCTRL_TXENDI, p->txendi);
+	reg |= FIELD_PREP(DMA_PCTRL_RXENDI, p->rxendi);
+
+	if (d->ver == DMA_VER22) {
+		reg |= FIELD_PREP(DMA_PCTRL_TXBL, p->txbl);
+		reg |= FIELD_PREP(DMA_PCTRL_RXBL, p->rxbl);
+	} else {
+		reg |= FIELD_PREP(DMA_PCTRL_PDEN, p->pkt_drop);
+
+		if (p->txbl == DMA_BURSTL_32DW)
+			reg |= DMA_PCTRL_TXBL32;
+		else if (p->txbl == DMA_BURSTL_16DW)
+			reg |= DMA_PCTRL_TXBL16;
+		else
+			reg |= FIELD_PREP(DMA_PCTRL_TXBL, DMA_PCTRL_TXBL_8);
+
+		if (p->rxbl == DMA_BURSTL_32DW)
+			reg |= DMA_PCTRL_RXBL32;
+		else if (p->rxbl == DMA_BURSTL_16DW)
+			reg |= DMA_PCTRL_RXBL16;
+		else
+			reg |= FIELD_PREP(DMA_PCTRL_RXBL, DMA_PCTRL_RXBL_8);
+	}
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	writel(p->portid, d->base + DMA_PS);
+	writel(reg, d->base + DMA_PCTRL);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+
+	reg = readl(d->base + DMA_PCTRL); /* read back */
+	dev_dbg(d->dev, "Port Control 0x%08x configuration done\n", reg);
+
+	return 0;
+}
+
+static int ldma_chan_cfg(struct ldma_chan *c)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+	u32 reg;
+
+	reg = c->pden ? DMA_CCTRL_PDEN : 0;
+	reg |= c->onoff ? DMA_CCTRL_ON : 0;
+	reg |= c->rst ? DMA_CCTRL_RST : 0;
+
+	ldma_chan_cctrl_cfg(c, reg);
+	ldma_chan_irq_init(c);
+
+	if (d->ver <= DMA_VER22)
+		return 0;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	ldma_chan_set_class(c, c->nr);
+	ldma_chan_byte_offset_cfg(c, c->boff_len);
+	ldma_chan_data_endian_cfg(c, c->data_endian_en, c->data_endian);
+	ldma_chan_desc_endian_cfg(c, c->desc_endian_en, c->desc_endian);
+	ldma_chan_hdr_mode_cfg(c, c->hdrm_len, c->hdrm_csum);
+	ldma_chan_rxwr_np_cfg(c, c->desc_rx_np);
+	ldma_chan_abc_cfg(c, c->abc_en);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+
+	if (ldma_chan_is_hw_desc(c))
+		ldma_chan_desc_hw_cfg(c, c->desc_phys, c->desc_cnt);
+
+	return 0;
+}
+
+static void ldma_dev_init(struct ldma_dev *d)
+{
+	unsigned long ch_mask = (unsigned long)d->channels_mask;
+	struct ldma_port *p;
+	struct ldma_chan *c;
+	int i;
+	u32 j;
+
+	spin_lock_init(&d->dev_lock);
+	ldma_dev_reset(d);
+	ldma_dev_cfg(d);
+
+	/* DMA port initialization */
+	for (i = 0; i < d->port_nrs; i++) {
+		p = &d->ports[i];
+		ldma_port_cfg(p);
+	}
+
+	/* DMA channel initialization */
+	for_each_set_bit(j, &ch_mask, d->chan_nrs) {
+		c = &d->chans[j];
+		ldma_chan_cfg(c);
+	}
+}
+
+static int ldma_cfg_init(struct ldma_dev *d)
+{
+	struct fwnode_handle *fwnode = dev_fwnode(d->dev);
+	struct ldma_port *p;
+	u32 val;
+	int i;
+
+	if (fwnode_property_read_bool(fwnode, "intel,dma-chan-fc"))
+		d->flags |= DMA_CHAN_FLOW_CTL;
+
+	if (fwnode_property_read_bool(fwnode, "intel,dma-desc-fod"))
+		d->flags |= DMA_DESC_FTOD;
+
+	if (fwnode_property_read_bool(fwnode, "intel,dma-desc-in-sram"))
+		d->flags |= DMA_DESC_IN_SRAM;
+
+	if (fwnode_property_read_bool(fwnode, "intel,dma-byte-en"))
+		d->flags |= DMA_EN_BYTE_EN;
+
+	if (fwnode_property_read_bool(fwnode, "intel,dma-dfetch-ack"))
+		d->flags |= DMA_VLD_FETCH_ACK;
+
+	if (fwnode_property_read_bool(fwnode, "intel,dma-dburst-wr"))
+		d->flags |= DMA_DBURST_WR;
+
+	if (fwnode_property_read_bool(fwnode, "intel,dma-drb"))
+		d->flags |= DMA_DFT_DRB;
+
+	if (fwnode_property_read_u32(fwnode, "intel,dma-poll-cnt",
+				     &d->pollcnt))
+		d->pollcnt = DMA_DFT_POLL_CNT;
+
+	if (!fwnode_property_read_u32(fwnode, "intel,dma-orrc", &val)) {
+		if (val > DMA_ORRC_MAX_CNT)
+			return -EINVAL;
+		d->orrc = val;
+	}
+
+	if (d->ver > DMA_VER22) {
+		if (!d->port_nrs)
+			return -EINVAL;
+
+		for (i = 0; i < d->port_nrs; i++) {
+			p = &d->ports[i];
+			p->rxendi = DMA_DFT_ENDIAN;
+			p->txendi = DMA_DFT_ENDIAN;
+			p->rxbl = DMA_DFT_BURST;
+			p->txbl = DMA_DFT_BURST;
+			p->pkt_drop = DMA_PKT_DROP_DIS;
+		}
+	}
+
+	return 0;
+}
+
+static void dma_free_desc_resource(struct virt_dma_desc *vdesc)
+{
+	struct dw2_desc_sw *ds = to_lgm_dma_desc(vdesc);
+	struct ldma_chan *c = ds->chan;
+
+	dma_pool_free(c->desc_pool, ds->desc_hw, ds->desc_phys);
+	kfree(ds);
+}
+
+static struct dw2_desc_sw *
+dma_alloc_desc_resource(int num, struct ldma_chan *c)
+{
+	struct device *dev = c->vchan.chan.device->dev;
+	struct dw2_desc_sw *ds;
+
+	if (num > c->desc_num) {
+		dev_err(dev, "sg num %d exceed max %d\n", num, c->desc_num);
+		return NULL;
+	}
+
+	ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
+	if (!ds)
+		return NULL;
+
+	ds->chan = c;
+	ds->desc_hw = dma_pool_zalloc(c->desc_pool, GFP_ATOMIC,
+				      &ds->desc_phys);
+	if (!ds->desc_hw) {
+		dev_dbg(dev, "out of memory for link descriptor\n");
+		kfree(ds);
+		return NULL;
+	}
+	ds->desc_cnt = num;
+
+	return ds;
+}
+
+static void ldma_chan_irq_en(struct ldma_chan *c)
+{
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+
+	spin_lock_irqsave(&d->dev_lock, flags);
+	writel(c->nr, d->base + DMA_CS);
+	writel(DMA_CI_EOP, d->base + DMA_CIE);
+	writel(BIT(c->nr), d->base + DMA_IRNEN);
+	spin_unlock_irqrestore(&d->dev_lock, flags);
+}
+
+static void dma_issue_pending(struct dma_chan *chan)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	unsigned long flags;
+
+	if (d->ver == DMA_VER22) {
+		spin_lock_irqsave(&c->vchan.lock, flags);
+		if (vchan_issue_pending(&c->vchan)) {
+			struct virt_dma_desc *vdesc;
+
+			/* Get the next descriptor */
+			vdesc = vchan_next_desc(&c->vchan);
+			if (!vdesc) {
+				c->ds = NULL;
+				spin_unlock_irqrestore(&c->vchan.lock, flags);
+				return;
+			}
+			list_del(&vdesc->node);
+			c->ds = to_lgm_dma_desc(vdesc);
+			ldma_chan_desc_hw_cfg(c, c->ds->desc_phys, c->ds->desc_cnt);
+			ldma_chan_irq_en(c);
+		}
+		spin_unlock_irqrestore(&c->vchan.lock, flags);
+	}
+	ldma_chan_on(c);
+}
+
+static void dma_synchronize(struct dma_chan *chan)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+
+	/*
+	 * clear any pending work if any. In that
+	 * case the resource needs to be free here.
+	 */
+	cancel_work_sync(&c->work);
+	vchan_synchronize(&c->vchan);
+	if (c->ds)
+		dma_free_desc_resource(&c->ds->vdesc);
+}
+
+static int dma_terminate_all(struct dma_chan *chan)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock_irqsave(&c->vchan.lock, flags);
+	vchan_get_all_descriptors(&c->vchan, &head);
+	spin_unlock_irqrestore(&c->vchan.lock, flags);
+	vchan_dma_desc_free_list(&c->vchan, &head);
+
+	return ldma_chan_reset(c);
+}
+
+static int dma_resume_chan(struct dma_chan *chan)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+
+	ldma_chan_on(c);
+
+	return 0;
+}
+
+static int dma_pause_chan(struct dma_chan *chan)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+
+	return ldma_chan_off(c);
+}
+
+static enum dma_status
+dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
+	      struct dma_tx_state *txstate)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	enum dma_status status = DMA_COMPLETE;
+
+	if (d->ver == DMA_VER22)
+		status = dma_cookie_status(chan, cookie, txstate);
+
+	return status;
+}
+
+static void dma_chan_irq(int irq, void *data)
+{
+	struct ldma_chan *c = data;
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	u32 stat;
+
+	/* Disable channel interrupts  */
+	writel(c->nr, d->base + DMA_CS);
+	stat = readl(d->base + DMA_CIS);
+	if (!stat)
+		return;
+
+	writel(readl(d->base + DMA_CIE) & ~DMA_CI_ALL, d->base + DMA_CIE);
+	writel(stat, d->base + DMA_CIS);
+	queue_work(d->wq, &c->work);
+}
+
+static irqreturn_t dma_interrupt(int irq, void *dev_id)
+{
+	struct ldma_dev *d = dev_id;
+	struct ldma_chan *c;
+	unsigned long irncr;
+	u32 cid;
+
+	irncr = readl(d->base + DMA_IRNCR);
+	if (!irncr) {
+		dev_err(d->dev, "dummy interrupt\n");
+		return IRQ_NONE;
+	}
+
+	for_each_set_bit(cid, &irncr, d->chan_nrs) {
+		/* Mask */
+		writel(readl(d->base + DMA_IRNEN) & ~BIT(cid), d->base + DMA_IRNEN);
+		/* Ack */
+		writel(readl(d->base + DMA_IRNCR) | BIT(cid), d->base + DMA_IRNCR);
+
+		c = &d->chans[cid];
+		dma_chan_irq(irq, c);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void prep_slave_burst_len(struct ldma_chan *c)
+{
+	struct ldma_port *p = c->port;
+	struct dma_slave_config *cfg = &c->config;
+
+	if (cfg->dst_maxburst)
+		cfg->src_maxburst = cfg->dst_maxburst;
+
+	/* TX and RX has the same burst length */
+	p->txbl = ilog2(cfg->src_maxburst);
+	p->rxbl = p->txbl;
+}
+
+static struct dma_async_tx_descriptor *
+dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
+		  unsigned int sglen, enum dma_transfer_direction dir,
+		  unsigned long flags, void *context)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+	size_t len, avail, total = 0;
+	struct dw2_desc *hw_ds;
+	struct dw2_desc_sw *ds;
+	struct scatterlist *sg;
+	int num = sglen, i;
+	dma_addr_t addr;
+
+	if (!sgl)
+		return NULL;
+
+	for_each_sg(sgl, sg, sglen, i) {
+		avail = sg_dma_len(sg);
+		if (avail > DMA_MAX_SIZE)
+			num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
+	}
+
+	ds = dma_alloc_desc_resource(num, c);
+	if (!ds)
+		return NULL;
+
+	c->ds = ds;
+
+	num = 0;
+	/* sop and eop has to be handled nicely */
+	for_each_sg(sgl, sg, sglen, i) {
+		addr = sg_dma_address(sg);
+		avail = sg_dma_len(sg);
+		total += avail;
+
+		do {
+			len = min_t(size_t, avail, DMA_MAX_SIZE);
+
+			hw_ds = &ds->desc_hw[num];
+			switch (sglen) {
+			case 1:
+				hw_ds->field.sop = 1;
+				hw_ds->field.eop = 1;
+				break;
+			default:
+				if (num == 0) {
+					hw_ds->field.sop = 1;
+					hw_ds->field.eop = 0;
+				} else if (num == (sglen - 1)) {
+					hw_ds->field.sop = 0;
+					hw_ds->field.eop = 1;
+				} else {
+					hw_ds->field.sop = 0;
+					hw_ds->field.eop = 0;
+				}
+				break;
+			}
+
+			/* Only 32 bit address supported */
+			hw_ds->addr = (u32)addr;
+			hw_ds->field.len = len;
+			hw_ds->field.c = 0;
+			hw_ds->field.bofs = addr & 0x3;
+			/* Ensure data ready before ownership change */
+			wmb();
+			hw_ds->field.own = DMA_OWN;
+			/* Ensure ownership changed before moving forward */
+			wmb();
+			num++;
+			addr += len;
+			avail -= len;
+		} while (avail);
+	}
+
+	ds->size = total;
+	prep_slave_burst_len(c);
+
+	return vchan_tx_prep(&c->vchan, &ds->vdesc, DMA_CTRL_ACK);
+}
+
+static int
+dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+
+	memcpy(&c->config, cfg, sizeof(c->config));
+
+	return 0;
+}
+
+static int dma_alloc_chan_resources(struct dma_chan *chan)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+	struct device *dev = c->vchan.chan.device->dev;
+	size_t	desc_sz;
+
+	if (d->ver > DMA_VER22) {
+		c->flags |= CHAN_IN_USE;
+		return 0;
+	}
+
+	if (c->desc_pool)
+		return c->desc_num;
+
+	desc_sz = c->desc_num * sizeof(struct dw2_desc);
+	c->desc_pool = dma_pool_create(c->name, dev, desc_sz,
+				       __alignof__(struct dw2_desc), 0);
+
+	if (!c->desc_pool) {
+		dev_err(dev, "unable to allocate descriptor pool\n");
+		return -ENOMEM;
+	}
+
+	return c->desc_num;
+}
+
+static void dma_free_chan_resources(struct dma_chan *chan)
+{
+	struct ldma_chan *c = to_ldma_chan(chan);
+	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
+
+	if (d->ver == DMA_VER22) {
+		dma_pool_destroy(c->desc_pool);
+		c->desc_pool = NULL;
+		vchan_free_chan_resources(to_virt_chan(chan));
+		ldma_chan_reset(c);
+	} else {
+		c->flags &= ~CHAN_IN_USE;
+	}
+}
+
+static void dma_work(struct work_struct *work)
+{
+	struct ldma_chan *c = container_of(work, struct ldma_chan, work);
+	struct dma_async_tx_descriptor *tx = &c->ds->vdesc.tx;
+	struct virt_dma_chan *vc = &c->vchan;
+	struct dmaengine_desc_callback cb;
+	struct virt_dma_desc *vd, *_vd;
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock_irqsave(&c->vchan.lock, flags);
+	list_splice_tail_init(&vc->desc_completed, &head);
+	spin_unlock_irqrestore(&c->vchan.lock, flags);
+	dmaengine_desc_get_callback(tx, &cb);
+	dma_cookie_complete(tx);
+	dmaengine_desc_callback_invoke(&cb, NULL);
+
+	list_for_each_entry_safe(vd, _vd, &head, node) {
+		dmaengine_desc_get_callback(tx, &cb);
+		dma_cookie_complete(tx);
+		list_del(&vd->node);
+		dmaengine_desc_callback_invoke(&cb, NULL);
+
+		vchan_vdesc_fini(vd);
+	}
+	c->ds = NULL;
+}
+
+static void
+update_burst_len_v22(struct ldma_chan *c, struct ldma_port *p, u32 burst)
+{
+	if (ldma_chan_tx(c))
+		p->txbl = ilog2(burst);
+	else
+		p->rxbl = ilog2(burst);
+}
+
+static void
+update_burst_len_v3X(struct ldma_chan *c, struct ldma_port *p, u32 burst)
+{
+	if (ldma_chan_tx(c))
+		p->txbl = burst;
+	else
+		p->rxbl = burst;
+}
+
+static int
+update_client_configs(struct of_dma *ofdma, struct of_phandle_args *spec)
+{
+	struct ldma_dev *d = ofdma->of_dma_data;
+	u32 chan_id =  spec->args[0];
+	u32 port_id =  spec->args[1];
+	u32 burst = spec->args[2];
+	struct ldma_port *p;
+	struct ldma_chan *c;
+
+	if (chan_id >= d->chan_nrs || port_id >= d->port_nrs)
+		return 0;
+
+	p = &d->ports[port_id];
+	c = &d->chans[chan_id];
+	c->port = p;
+
+	if (d->ver == DMA_VER22)
+		update_burst_len_v22(c, p, burst);
+	else
+		update_burst_len_v3X(c, p, burst);
+
+	ldma_port_cfg(p);
+
+	return 1;
+}
+
+static struct dma_chan *ldma_xlate(struct of_phandle_args *spec,
+				   struct of_dma *ofdma)
+{
+	struct ldma_dev *d = ofdma->of_dma_data;
+	u32 chan_id =  spec->args[0];
+	int ret;
+
+	if (!spec->args_count)
+		return NULL;
+
+	/* if args_count is 1 driver use default settings */
+	if (spec->args_count > 1) {
+		ret = update_client_configs(ofdma, spec);
+		if (!ret)
+			return NULL;
+	}
+
+	return dma_get_slave_channel(&d->chans[chan_id].vchan.chan);
+}
+
+static void ldma_dma_init_v22(int i, struct ldma_dev *d)
+{
+	struct ldma_chan *c;
+
+	c = &d->chans[i];
+	c->nr = i; /* Real channel number */
+	c->rst = DMA_CHAN_RST;
+	c->desc_num = DMA_DFT_DESC_NUM;
+	snprintf(c->name, sizeof(c->name), "chan%d", c->nr);
+	INIT_WORK(&c->work, dma_work);
+	c->vchan.desc_free = dma_free_desc_resource;
+	vchan_init(&c->vchan, &d->dma_dev);
+}
+
+static void ldma_dma_init_v3X(int i, struct ldma_dev *d)
+{
+	struct ldma_chan *c;
+
+	c = &d->chans[i];
+	c->data_endian = DMA_DFT_ENDIAN;
+	c->desc_endian = DMA_DFT_ENDIAN;
+	c->data_endian_en = false;
+	c->desc_endian_en = false;
+	c->desc_rx_np = false;
+	c->flags |= DEVICE_ALLOC_DESC;
+	c->onoff = DMA_CH_OFF;
+	c->rst = DMA_CHAN_RST;
+	c->abc_en = true;
+	c->hdrm_csum = false;
+	c->boff_len = 0;
+	c->nr = i;
+	c->vchan.desc_free = dma_free_desc_resource;
+	vchan_init(&c->vchan, &d->dma_dev);
+}
+
+static int ldma_init_v22(struct ldma_dev *d, struct platform_device *pdev)
+{
+	int ret;
+
+	ret = device_property_read_u32(d->dev, "dma-channels", &d->chan_nrs);
+	if (ret < 0) {
+		dev_err(d->dev, "unable to read dma-channels property\n");
+		return ret;
+	}
+
+	d->irq = platform_get_irq(pdev, 0);
+	if (d->irq < 0)
+		return d->irq;
+
+	ret = devm_request_irq(&pdev->dev, d->irq, dma_interrupt, 0,
+			       DRIVER_NAME, d);
+	if (ret)
+		return ret;
+
+	d->wq = alloc_ordered_workqueue("dma_wq", WQ_MEM_RECLAIM |
+			WQ_HIGHPRI);
+	if (!d->wq)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void ldma_clk_disable(void *data)
+{
+	struct ldma_dev *d = data;
+
+	clk_disable_unprepare(d->core_clk);
+	reset_control_assert(d->rst);
+}
+
+static struct dma_dev_ops dma0_ops = {
+	.device_alloc_chan_resources = dma_alloc_chan_resources,
+	.device_free_chan_resources = dma_free_chan_resources,
+	.device_config = dma_slave_config,
+	.device_prep_slave_sg = dma_prep_slave_sg,
+	.device_tx_status = dma_tx_status,
+	.device_pause = dma_pause_chan,
+	.device_resume = dma_resume_chan,
+	.device_terminate_all = dma_terminate_all,
+	.device_synchronize = dma_synchronize,
+	.device_issue_pending = dma_issue_pending,
+};
+
+static struct dma_dev_ops hdma_ops = {
+	.device_alloc_chan_resources = dma_alloc_chan_resources,
+	.device_free_chan_resources = dma_free_chan_resources,
+	.device_terminate_all = dma_terminate_all,
+	.device_issue_pending = dma_issue_pending,
+	.device_tx_status = dma_tx_status,
+	.device_resume = dma_resume_chan,
+	.device_pause = dma_pause_chan,
+};
+
+static const struct ldma_inst_data dma0 = {
+	.name = "dma0",
+	.ops = &dma0_ops,
+};
+
+static const struct ldma_inst_data dma2tx = {
+	.name = "dma2tx",
+	.type = DMA_TYPE_TX,
+	.ops = &hdma_ops,
+};
+
+static const struct ldma_inst_data dma1rx = {
+	.name = "dma1rx",
+	.type = DMA_TYPE_RX,
+	.ops = &hdma_ops,
+};
+
+static const struct ldma_inst_data dma1tx = {
+	.name = "dma1tx",
+	.type = DMA_TYPE_TX,
+	.ops = &hdma_ops,
+};
+
+static const struct ldma_inst_data dma0tx = {
+	.name = "dma0tx",
+	.type = DMA_TYPE_TX,
+	.ops = &hdma_ops,
+};
+
+static const struct ldma_inst_data dma3 = {
+	.name = "dma3",
+	.type = DMA_TYPE_MCPY,
+	.ops = &hdma_ops,
+};
+
+static const struct ldma_inst_data toe_dma30 = {
+	.name = "toe_dma30",
+	.type = DMA_TYPE_MCPY,
+	.ops = &hdma_ops,
+};
+
+static const struct ldma_inst_data toe_dma31 = {
+	.name = "toe_dma31",
+	.type = DMA_TYPE_MCPY,
+	.ops = &hdma_ops,
+};
+
+static const struct of_device_id intel_ldma_match[] = {
+	{ .compatible = "intel,lgm-cdma", .data = &dma0},
+	{ .compatible = "intel,lgm-dma2tx", .data = &dma2tx},
+	{ .compatible = "intel,lgm-dma1rx", .data = &dma1rx},
+	{ .compatible = "intel,lgm-dma1tx", .data = &dma1tx},
+	{ .compatible = "intel,lgm-dma0tx", .data = &dma0tx},
+	{ .compatible = "intel,lgm-dma3", .data = &dma3},
+	{ .compatible = "intel,lgm-toe-dma30", .data = &toe_dma30},
+	{ .compatible = "intel,lgm-toe-dma31", .data = &toe_dma31},
+	{}
+};
+
+static int intel_ldma_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct dma_device *dma_dev;
+	unsigned long ch_mask;
+	struct ldma_chan *c;
+	struct ldma_port *p;
+	struct ldma_dev *d;
+	u32 id, bitn = 32, j;
+	int i, ret;
+
+	d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
+	if (!d)
+		return -ENOMEM;
+
+	/* Link controller to platform device */
+	d->dev = &pdev->dev;
+
+	d->inst = device_get_match_data(dev);
+	if (!d->inst) {
+		dev_err(dev, "No device match found\n");
+		return -ENODEV;
+	}
+
+	d->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(d->base))
+		return PTR_ERR(d->base);
+
+	/* Power up and reset the dma engine, some DMAs always on?? */
+	d->core_clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(d->core_clk))
+		return PTR_ERR(d->core_clk);
+	clk_prepare_enable(d->core_clk);
+
+	d->rst = devm_reset_control_get_optional(dev, NULL);
+	if (IS_ERR(d->rst))
+		return PTR_ERR(d->rst);
+	reset_control_deassert(d->rst);
+
+	ret = devm_add_action_or_reset(dev, ldma_clk_disable, d);
+	if (ret) {
+		dev_err(dev, "Failed to devm_add_action_or_reset, %d\n", ret);
+		return ret;
+	}
+
+	id = readl(d->base + DMA_ID);
+	d->chan_nrs = FIELD_GET(DMA_ID_CHNR, id);
+	d->port_nrs = FIELD_GET(DMA_ID_PNR, id);
+	d->ver = FIELD_GET(DMA_ID_REV, id);
+
+	if (id & DMA_ID_AW_36B)
+		d->flags |= DMA_ADDR_36BIT;
+
+	if (IS_ENABLED(CONFIG_64BIT) && (id & DMA_ID_AW_36B))
+		bitn = 36;
+
+	if (id & DMA_ID_DW_128B)
+		d->flags |= DMA_DATA_128BIT;
+
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(bitn));
+	if (ret) {
+		dev_err(dev, "No usable DMA configuration\n");
+		return ret;
+	}
+
+	if (d->ver == DMA_VER22) {
+		ret = ldma_init_v22(d, pdev);
+		if (ret)
+			return ret;
+	}
+
+	ret = device_property_read_u32(dev, "dma-channel-mask", &d->channels_mask);
+	if (ret < 0)
+		d->channels_mask = GENMASK(d->chan_nrs - 1, 0);
+
+	dma_dev = &d->dma_dev;
+
+	dma_cap_zero(dma_dev->cap_mask);
+	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
+
+	/* Channel initializations */
+	INIT_LIST_HEAD(&dma_dev->channels);
+
+	/* Port Initializations */
+	d->ports = devm_kcalloc(dev, d->port_nrs, sizeof(*p), GFP_KERNEL);
+	if (!d->ports)
+		return -ENOMEM;
+
+	/* Channels Initializations */
+	d->chans = devm_kcalloc(d->dev, d->chan_nrs, sizeof(*c), GFP_KERNEL);
+	if (!d->chans)
+		return -ENOMEM;
+
+	for (i = 0; i < d->port_nrs; i++) {
+		p = &d->ports[i];
+		p->portid = i;
+		p->ldev = d;
+	}
+
+	ret = ldma_cfg_init(d);
+	if (ret)
+		return ret;
+
+	dma_dev->dev = &pdev->dev;
+
+	ch_mask = (unsigned long)d->channels_mask;
+	for_each_set_bit(j, &ch_mask, d->chan_nrs) {
+		if (d->ver == DMA_VER22)
+			ldma_dma_init_v22(j, d);
+		else
+			ldma_dma_init_v3X(j, d);
+	}
+
+	dma_dev->device_alloc_chan_resources =
+		d->inst->ops->device_alloc_chan_resources;
+	dma_dev->device_free_chan_resources =
+		d->inst->ops->device_free_chan_resources;
+	dma_dev->device_terminate_all = d->inst->ops->device_terminate_all;
+	dma_dev->device_issue_pending = d->inst->ops->device_issue_pending;
+	dma_dev->device_tx_status = d->inst->ops->device_tx_status;
+	dma_dev->device_resume = d->inst->ops->device_resume;
+	dma_dev->device_pause = d->inst->ops->device_pause;
+	dma_dev->device_config = d->inst->ops->device_config;
+	dma_dev->device_prep_slave_sg = d->inst->ops->device_prep_slave_sg;
+	dma_dev->device_synchronize = d->inst->ops->device_synchronize;
+
+	if (d->ver == DMA_VER22) {
+		dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+		dma_dev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+		dma_dev->directions = BIT(DMA_MEM_TO_DEV) |
+				      BIT(DMA_DEV_TO_MEM);
+		dma_dev->residue_granularity =
+					DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
+	}
+
+	platform_set_drvdata(pdev, d);
+
+	ldma_dev_init(d);
+
+	ret = dma_async_device_register(dma_dev);
+	if (ret) {
+		dev_err(dev, "Failed to register slave DMA engine device\n");
+		return ret;
+	}
+
+	ret = of_dma_controller_register(pdev->dev.of_node, ldma_xlate, d);
+	if (ret) {
+		dev_err(dev, "Failed to register of DMA controller\n");
+		dma_async_device_unregister(dma_dev);
+		return ret;
+	}
+
+	dev_info(dev, "Init done - rev: %x, ports: %d channels: %d\n", d->ver,
+		 d->port_nrs, d->chan_nrs);
+
+	return 0;
+}
+
+static struct platform_driver intel_ldma_driver = {
+	.probe = intel_ldma_probe,
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = intel_ldma_match,
+	},
+};
+
+/*
+ * Perform this driver as device_initcall to make sure initialization happens
+ * before its DMA clients of some are platform specific and also to provide
+ * registered DMA channels and DMA capabilities to clients before their
+ * initialization.
+ */
+static int __init intel_ldma_init(void)
+{
+	return platform_driver_register(&intel_ldma_driver);
+}
+
+device_initcall(intel_ldma_init);
diff --git a/include/linux/dma/lgm_dma.h b/include/linux/dma/lgm_dma.h
new file mode 100644
index 000000000000..3a2ee6ad0710
--- /dev/null
+++ b/include/linux/dma/lgm_dma.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2016 ~ 2019 Intel Corporation.
+ */
+#ifndef LGM_DMA_H
+#define LGM_DMA_H
+
+#include <linux/types.h>
+#include <linux/dmaengine.h>
+
+/*!
+ * \fn int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base,
+ *                                 int desc_num)
+ * \brief Configure low level channel descriptors
+ * \param[in] chan   pointer to DMA channel that the client is using
+ * \param[in] desc_base   descriptor base physical address
+ * \param[in] desc_num   number of descriptors
+ * \return   0 on success
+ * \return   kernel bug reported on failure
+ *
+ * This function configure the low level channel descriptors. It will be
+ * used by CBM whose descriptor is not DDR, actually some registers.
+ */
+int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base,
+			    int desc_num);
+
+#endif /* LGM_DMA_H */
-- 
2.11.0

RE: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel LGM SOC

[Thomas Langer]

Hello Reddy,

I think "Intel" should always be written with a capital "I" (like in the Subject, but except in the binding below)

> + compatible:
> +  oneOf:
> +   - const: intel,lgm-cdma
> +   - const: intel,lgm-dma2tx
> +   - const: intel,lgm-dma1rx
> +   - const: intel,lgm-dma1tx
> +   - const: intel,lgm-dma0tx
> +   - const: intel,lgm-dma3
> +   - const: intel,lgm-toe-dma30
> +   - const: intel,lgm-toe-dma31

Bindings are normally not per instance.
What if next generation chip gets more DMA modules but has no other changes in the HW block?
What is wrong with
  - const: intel,lgm-cdma
  - const: intel,lgm-hdma
and extra attributes to define the rx/tx restriction (or what do it mean?)? 
From the driver code I saw that "toe" is also just of type "hdma" and no further differences in code are done.

Best regards,
Thomas

RE: [PATCH v7 2/2] Add Intel LGM soc DMA support.

[Thomas Langer]

Hello Reddy,

some comments below. I only commented regarding some structural things,
as I am not so familiar with the functional side of DMA.

> -----Original Message-----
> From: Amireddy Mallikarjuna reddy
> <mallikarjunax.reddy@linux.intel.com>
> Sent: Dienstag, 27. Oktober 2020 09:03
> To: dmaengine@vger.kernel.org; vkoul@kernel.org;
> devicetree@vger.kernel.org; robh+dt@kernel.org
> Cc: linux-kernel@vger.kernel.org; Shevchenko, Andriy
> <andriy.shevchenko@intel.com>; chuanhua.lei@linux.intel.com; Kim,
> Cheol Yong <cheol.yong.kim@intel.com>; Wu, Qiming <qi-
> ming.wu@intel.com>; mallikarjunax.reddy@linux.intel.com;
> malliamireddy009@gmail.com; peter.ujfalusi@ti.com
> Subject: [PATCH v7 2/2] Add Intel LGM soc DMA support.
> 
> Add DMA controller driver for Lightning Mountain(LGM) family of SoCs.
> 
> The main function of the DMA controller is the transfer of data
> from/to any
> DPlus compliant peripheral to/from the memory. A memory to memory copy
> capability can also be configured.

What is "DPlus compliant"? This needs some explanation.

> 
> This ldma driver is used for configure the device and channnels for
> data
> and control paths.
> 
> Signed-off-by: Amireddy Mallikarjuna reddy
> <mallikarjunax.reddy@linux.intel.com>
> ---
> v1:
> - Initial version.
> 
> v2:
> - Fix device tree bot issues, correspondign driver changes done.
> - Fix kerntel test robot warnings.
>   --------------------------------------------------------
>   >> drivers/dma/lgm/lgm-dma.c:729:5: warning: no previous prototype
> for function 'intel_dma_chan_desc_cfg' [-Wmissing-prototypes]
>   int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
> desc_base,
>   ^
>   drivers/dma/lgm/lgm-dma.c:729:1: note: declare 'static' if the
> function is not intended to be used outside of this translation unit
>   int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
> desc_base,
>   ^
>   static
>   1 warning generated.
> 
>   vim +/intel_dma_chan_desc_cfg +729 drivers/dma/lgm/lgm-dma.c
> 
>     728
>   > 729 int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
> desc_base,
>     730                             int desc_num)
>     731 {
>     732         return ldma_chan_desc_cfg(to_ldma_chan(chan),
> desc_base, desc_num);
>     733 }
>     734 EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg);
>     735
> 
>    Reported-by: kernel test robot <lkp@intel.com>
>    ---------------------------------------------------------------
> 
> v3:
> - Fix smatch warning.
>   ----------------------------------------------------------------
>   smatch warnings:
>   drivers/dma/lgm/lgm-dma.c:1306 ldma_cfg_init() error: uninitialized
> symbol 'ret'.
> 
>   Reported-by: kernel test robot <lkp@intel.com>
>   Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>   ----------------------------------------------------------------
> 
> v4:
> - Address Thomas Langer comments in dtbinding and corresponding driver
> side changes.
> - Driver side changes to corresponding device tree changes.
> 
> v5:
> - Add changes to read 'dmas' properties and update the config
> properties driver side.
> - Add virt_dma_desc utilizes virt-dma API.
> 
> v6:
> - Driver changes corresponding to the device tree changes.
> - Restructure things to have less activity with the spinlock.
> - Save the slave config in dma_slave_config() and used in prepare
> time.
> - Addressed & fixed issues related to desc_free callback _free_ up the
> memory.
> - Addressed peter review comments.
> 
> v7:
> - Change bool to tristate in Kconfig

I see this "tristate" (compile as module) and the explanation
for the _initcall confusing. Either this is a driver for the SoC
that must be available early or it can be used as module (which
is typically loaded late). You cannot fulfill both things.

> - Explained the _initcall()
> - change of_property*() to device_property_*()
> - split the code to functions at version checks
> - Remove the dma caller capability restrictions
> - used for_each_set_bit()
> - Addressed minor comments and fine tune the code.
> ---
>  drivers/dma/Kconfig         |    2 +
>  drivers/dma/Makefile        |    1 +
>  drivers/dma/lgm/Kconfig     |    9 +
>  drivers/dma/lgm/Makefile    |    2 +
>  drivers/dma/lgm/lgm-dma.c   | 1765
> +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/dma/lgm_dma.h |   27 +
>  6 files changed, 1806 insertions(+)
>  create mode 100644 drivers/dma/lgm/Kconfig
>  create mode 100644 drivers/dma/lgm/Makefile
>  create mode 100644 drivers/dma/lgm/lgm-dma.c
>  create mode 100644 include/linux/dma/lgm_dma.h
> 
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index de41d7928bff..caeaf12fd524 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -737,6 +737,8 @@ source "drivers/dma/ti/Kconfig"
> 
>  source "drivers/dma/fsl-dpaa2-qdma/Kconfig"
> 
> +source "drivers/dma/lgm/Kconfig"
> +
>  # clients
>  comment "DMA Clients"
>  	depends on DMA_ENGINE
> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
> index e60f81331d4c..0b899b076f4e 100644
> --- a/drivers/dma/Makefile
> +++ b/drivers/dma/Makefile
> @@ -83,6 +83,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
>  obj-$(CONFIG_ZX_DMA) += zx_dma.o
>  obj-$(CONFIG_ST_FDMA) += st_fdma.o
>  obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/
> +obj-$(CONFIG_INTEL_LDMA) += lgm/
> 
>  obj-y += mediatek/
>  obj-y += qcom/
> diff --git a/drivers/dma/lgm/Kconfig b/drivers/dma/lgm/Kconfig
> new file mode 100644
> index 000000000000..bdb5b0d91afb
> --- /dev/null
> +++ b/drivers/dma/lgm/Kconfig
> @@ -0,0 +1,9 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +config INTEL_LDMA
> +	bool "Lightning Mountain centralized low speed DMA and high speed
> DMA controllers"
> +	select DMA_ENGINE
> +	select DMA_VIRTUAL_CHANNELS
> +	help
> +	  Enable support for intel Lightning Mountain SOC DMA
> controllers.
> +	  These controllers provide DMA capabilities for a variety of on-
> chip
> +	  devices such as SSC, HSNAND and GSWIP.
> diff --git a/drivers/dma/lgm/Makefile b/drivers/dma/lgm/Makefile
> new file mode 100644
> index 000000000000..f318a8eff464
> --- /dev/null
> +++ b/drivers/dma/lgm/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_INTEL_LDMA)	+= lgm-dma.o
> diff --git a/drivers/dma/lgm/lgm-dma.c b/drivers/dma/lgm/lgm-dma.c
> new file mode 100644
> index 000000000000..bd9bd450a50a
> --- /dev/null
> +++ b/drivers/dma/lgm/lgm-dma.c
> @@ -0,0 +1,1765 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Lightning Mountain centralized low speed and high speed DMA
> controller driver
> + *
> + * Copyright (c) 2016 ~ 2020 Intel Corporation.
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/dmapool.h>
> +#include <linux/dma/lgm_dma.h>
> +#include <linux/err.h>
> +#include <linux/export.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/iopoll.h>
> +#include <linux/of_dma.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +
> +#include "../dmaengine.h"
> +#include "../virt-dma.h"
> +
> +#define DRIVER_NAME			"lgm-ldma"

Why "ldma"? Same applies to most functions with the prefix "ldma_".

> +
> +#define DMA_ID				0x0008
> +#define DMA_ID_REV			GENMASK(7, 0)
> +#define DMA_ID_PNR			GENMASK(19, 16)
> +#define DMA_ID_CHNR			GENMASK(26, 20)
> +#define DMA_ID_DW_128B			BIT(27)
> +#define DMA_ID_AW_36B			BIT(28)
> +#define DMA_VER32			0x32
> +#define DMA_VER31			0x31
> +#define DMA_VER22			0x0A
> +
> +#define DMA_CTRL			0x0010
> +#define DMA_CTRL_RST			BIT(0)
> +#define DMA_CTRL_DSRAM_PATH		BIT(1)
> +#define DMA_CTRL_DBURST_WR		BIT(3)
> +#define DMA_CTRL_VLD_DF_ACK		BIT(4)
> +#define DMA_CTRL_CH_FL			BIT(6)
> +#define DMA_CTRL_DS_FOD			BIT(7)
> +#define DMA_CTRL_DRB			BIT(8)
> +#define DMA_CTRL_ENBE			BIT(9)
> +#define DMA_CTRL_DESC_TMOUT_CNT_V31	GENMASK(27, 16)
> +#define DMA_CTRL_DESC_TMOUT_EN_V31	BIT(30)
> +#define DMA_CTRL_PKTARB			BIT(31)
> +
> +#define DMA_CPOLL			0x0014
> +#define DMA_CPOLL_CNT			GENMASK(15, 4)
> +#define DMA_CPOLL_EN			BIT(31)
> +
> +#define DMA_CS				0x0018
> +#define DMA_CS_MASK			GENMASK(5, 0)
> +
> +#define DMA_CCTRL			0x001C
> +#define DMA_CCTRL_ON			BIT(0)
> +#define DMA_CCTRL_RST			BIT(1)
> +#define DMA_CCTRL_CH_POLL_EN		BIT(2)
> +#define DMA_CCTRL_CH_ABC		BIT(3) /* Adaptive Burst Chop */
> +#define DMA_CDBA_MSB			GENMASK(7, 4)
> +#define DMA_CCTRL_DIR_TX		BIT(8)
> +#define DMA_CCTRL_CLASS			GENMASK(11, 9)
> +#define DMA_CCTRL_CLASSH		GENMASK(19, 18)
> +#define DMA_CCTRL_WR_NP_EN		BIT(21)
> +#define DMA_CCTRL_PDEN			BIT(23)
> +#define DMA_MAX_CLASS			(SZ_32 - 1)
> +
> +#define DMA_CDBA			0x0020
> +#define DMA_CDLEN			0x0024
> +#define DMA_CIS				0x0028
> +#define DMA_CIE				0x002C
> +#define DMA_CI_EOP			BIT(1)
> +#define DMA_CI_DUR			BIT(2)
> +#define DMA_CI_DESCPT			BIT(3)
> +#define DMA_CI_CHOFF			BIT(4)
> +#define DMA_CI_RDERR			BIT(5)
> +#define DMA_CI_ALL							\
> +	(DMA_CI_EOP | DMA_CI_DUR | DMA_CI_DESCPT | DMA_CI_CHOFF |
> DMA_CI_RDERR)
> +
> +#define DMA_PS				0x0040
> +#define DMA_PCTRL			0x0044
> +#define DMA_PCTRL_RXBL16		BIT(0)
> +#define DMA_PCTRL_TXBL16		BIT(1)
> +#define DMA_PCTRL_RXBL			GENMASK(3, 2)
> +#define DMA_PCTRL_RXBL_8		3
> +#define DMA_PCTRL_TXBL			GENMASK(5, 4)
> +#define DMA_PCTRL_TXBL_8		3
> +#define DMA_PCTRL_PDEN			BIT(6)
> +#define DMA_PCTRL_RXBL32		BIT(7)
> +#define DMA_PCTRL_RXENDI		GENMASK(9, 8)
> +#define DMA_PCTRL_TXENDI		GENMASK(11, 10)
> +#define DMA_PCTRL_TXBL32		BIT(15)
> +#define DMA_PCTRL_MEM_FLUSH		BIT(16)
> +
> +#define DMA_IRNEN1			0x00E8
> +#define DMA_IRNCR1			0x00EC
> +#define DMA_IRNEN			0x00F4
> +#define DMA_IRNCR			0x00F8
> +#define DMA_C_DP_TICK			0x100
> +#define DMA_C_DP_TICK_TIKNARB		GENMASK(15, 0)
> +#define DMA_C_DP_TICK_TIKARB		GENMASK(31, 16)
> +
> +#define DMA_C_HDRM			0x110
> +/*
> + * If header mode is set in DMA descriptor,
> + *   If bit 30 is disabled, HDR_LEN must be configured according to
> channel
> + *     requirement.
> + *   If bit 30 is enabled(checksum with heade mode), HDR_LEN has no
> need to
> + *     be configured. It will enable check sum for switch
> + * If header mode is not set in DMA descriptor,
> + *   This register setting doesn't matter
> + */
> +#define DMA_C_HDRM_HDR_SUM		BIT(30)
> +
> +#define DMA_C_BOFF			0x120
> +#define DMA_C_BOFF_BOF_LEN		GENMASK(7, 0)
> +#define DMA_C_BOFF_EN			BIT(31)
> +
> +#define DMA_ORRC			0x190
> +#define DMA_ORRC_ORRCNT			GENMASK(8, 4)
> +#define DMA_ORRC_EN			BIT(31)
> +
> +#define DMA_C_ENDIAN			0x200
> +#define DMA_C_END_DATAENDI		GENMASK(1, 0)
> +#define DMA_C_END_DE_EN			BIT(7)
> +#define DMA_C_END_DESENDI		GENMASK(9, 8)
> +#define DMA_C_END_DES_EN		BIT(16)
> +
> +/* DMA controller capability */
> +#define DMA_ADDR_36BIT			BIT(0)
> +#define DMA_DATA_128BIT			BIT(1)
> +#define DMA_CHAN_FLOW_CTL		BIT(2)
> +#define DMA_DESC_FTOD			BIT(3)
> +#define DMA_DESC_IN_SRAM		BIT(4)
> +#define DMA_EN_BYTE_EN			BIT(5)
> +#define DMA_DBURST_WR			BIT(6)
> +#define DMA_VLD_FETCH_ACK		BIT(7)
> +#define DMA_DFT_DRB			BIT(8)
> +
> +#define DMA_ORRC_MAX_CNT		(SZ_32 - 1)
> +#define DMA_DFT_POLL_CNT		SZ_4
> +
> +#define DMA_DFT_BURST_V22		2
> +#define DMA_BURSTL_8DW			8
> +#define DMA_BURSTL_16DW			16
> +#define DMA_BURSTL_32DW			32
> +#define DMA_DFT_BURST			DMA_BURSTL_16DW
> +
> +#define DMA_MAX_DESC_NUM		(SZ_8K - 1)
> +#define DMA_CHAN_BOFF_MAX		(SZ_256 - 1)
> +
> +#define DMA_DFT_ENDIAN			DMA_ENDIAN_TYPE0
> +
> +#define DMA_DFT_DESC_TCNT		50
> +#define DMA_HDR_LEN_MAX			(SZ_16K - 1)
> +
> +/* DMA flags */
> +#define DMA_TX_CH			BIT(0)
> +#define DMA_RX_CH			BIT(1)
> +#define DEVICE_ALLOC_DESC		BIT(2)
> +#define CHAN_IN_USE			BIT(3)
> +#define DMA_HW_DESC			BIT(4)
> +
> +#define DMA_CHAN_RST			1
> +#define DMA_MAX_SIZE			(BIT(16) - 1)
> +#define MAX_LOWER_CHANS			32
> +#define MASK_LOWER_CHANS		GENMASK(4, 0)
> +#define DMA_OWN				1
> +#define HIGH_4_BITS			GENMASK(3, 0)
> +#define DMA_DFT_DESC_NUM		1
> +
> +enum ldma_chan_on_off {
> +	DMA_CH_OFF = 0,
> +	DMA_CH_ON = 1,
> +};
> +
> +enum ldma_pkt_drop {
> +	DMA_PKT_DROP_DIS = 0,
> +	DMA_PKT_DROP_EN,
> +};

What is the use of this enum if only "DMA_PKT_DROP_DIS" is used in the code?

> +
> +enum ldma_endian {
> +	DMA_ENDIAN_TYPE0 = 0,
> +	DMA_ENDIAN_TYPE1,
> +	DMA_ENDIAN_TYPE2,
> +	DMA_ENDIAN_TYPE3,
> +};

And from this enum only "DMA_ENDIAN_TYPE0" is used (indirectly via a define)

> +
> +enum {
> +	DMA_TYPE_TX = 0,
> +	DMA_TYPE_RX,
> +	DMA_TYPE_MCPY,
> +};
> +
> +enum ldma_port_name {
> +	PORT0_SPI0 = 0,
> +	PORT1_SPI1,
> +	PORT2_SPI2,
> +	PORT3_SPI3,
> +	PORT4_HSNAND,
> +	PORT5_PCM,
> +};

And this enum is not used at all!

> +
> +struct ldma_dev;
> +struct ldma_port;
> +
> +struct ldma_chan {
> +	struct virt_dma_chan	vchan;
> +	struct ldma_port	*port; /* back pointer */
> +	char			name[8]; /* Channel name */
> +	int			nr; /* Channel id in hardware */
> +	u32			flags; /* central way or channel based way */
> +	enum ldma_chan_on_off	onoff;
> +	dma_addr_t		desc_phys;
> +	void			*desc_base; /* Virtual address */
> +	u32			desc_cnt; /* Number of descriptors */
> +	int			rst;
> +	u32			hdrm_len;
> +	bool			hdrm_csum;
> +	u32			boff_len;
> +	u32			data_endian;
> +	u32			desc_endian;
> +	bool			pden;
> +	bool			desc_rx_np;
> +	bool			data_endian_en;
> +	bool			desc_endian_en;
> +	bool			abc_en;
> +	bool			desc_init;
> +	struct dma_pool		*desc_pool; /* Descriptors pool */
> +	u32			desc_num;
> +	struct dw2_desc_sw	*ds;
> +	struct work_struct	work;
> +	struct dma_slave_config config;
> +};
> +
> +struct ldma_port {
> +	struct ldma_dev		*ldev; /* back pointer */
> +	u32			portid;
> +	u32			rxbl;
> +	u32			txbl;
> +	enum ldma_endian	rxendi;
> +	enum ldma_endian	txendi;
> +	enum ldma_pkt_drop	pkt_drop;
> +};
> +
> +/* Instance specific data */
> +struct ldma_inst_data {
> +	struct dma_dev_ops	*ops;
> +	const char	*name;
> +	u32 type;

Why are the element names not aligned, as in other structs?

> +};
> +
> +struct ldma_dev {
> +	struct device		*dev;
> +	void __iomem		*base;
> +	struct reset_control	*rst;
> +	struct clk		*core_clk;
> +	struct dma_device	dma_dev;
> +	u32			ver;
> +	int			irq;
> +	struct ldma_port	*ports;
> +	struct ldma_chan	*chans; /* channel list on this DMA or port */
> +	spinlock_t		dev_lock; /* Controller register execlusive */

typo: exclusive

> +	u32			chan_nrs;
> +	u32			port_nrs;
> +	u32                     channels_mask;

Why do you use space in this line?

> +	u32			flags;
> +	u32			pollcnt;
> +	u32			orrc; /* Outstanding read count */
> +	const struct ldma_inst_data *inst;
> +	struct workqueue_struct *wq;
> +};
> +
> +struct dw2_desc {
> +	struct {
> +		u32 len		:16;
> +		u32 res0	:7;
> +		u32 bofs	:2;
> +		u32 res1	:3;
> +		u32 eop		:1;
> +		u32 sop		:1;
> +		u32 c		:1;
> +		u32 own		:1;

Typically, bitfields are written without spaces.
And you are really sure that this driver will never be used for the older SoCs (MIPS based)?
Because bitfields are difficult to handle when it comes to support both endianess variants.

> +	} __packed field;
> +	u32 addr;
> +} __packed __aligned(8);
> +
> +struct dw2_desc_sw {
> +	struct virt_dma_desc	vdesc;
> +	struct ldma_chan	*chan;
> +	dma_addr_t		desc_phys;
> +	size_t			desc_cnt;
> +	size_t			size;
> +	struct dw2_desc		*desc_hw;
> +};
> +
> +struct dma_dev_ops {
> +	int (*device_alloc_chan_resources)(struct dma_chan *chan);
> +	void (*device_free_chan_resources)(struct dma_chan *chan);
> +	int (*device_config)(struct dma_chan *chan,
> +			     struct dma_slave_config *config);
> +	int (*device_pause)(struct dma_chan *chan);
> +	int (*device_resume)(struct dma_chan *chan);
> +	int (*device_terminate_all)(struct dma_chan *chan);
> +	void (*device_synchronize)(struct dma_chan *chan);
> +	enum dma_status (*device_tx_status)(struct dma_chan *chan,
> +					    dma_cookie_t cookie,
> +					    struct dma_tx_state *txstate);
> +	struct dma_async_tx_descriptor *(*device_prep_slave_sg)
> +		(struct dma_chan *chan, struct scatterlist *sgl,
> +		unsigned int sg_len, enum dma_transfer_direction direction,
> +		unsigned long flags, void *context);
> +	void (*device_issue_pending)(struct dma_chan *chan);
> +};
> +
> +static inline void
> +ldma_update_bits(struct ldma_dev *d, u32 mask, u32 val, u32 ofs)
> +{
> +	u32 old_val, new_val;
> +
> +	old_val = readl(d->base +  ofs);
> +	new_val = (old_val & ~mask) | (val & mask);
> +
> +	if (new_val != old_val)
> +		writel(new_val, d->base + ofs);
> +}
> +
> +static inline struct ldma_chan *to_ldma_chan(struct dma_chan *chan)
> +{
> +	return container_of(chan, struct ldma_chan, vchan.chan);
> +}
> +
> +static inline struct ldma_dev *to_ldma_dev(struct dma_device
> *dma_dev)
> +{
> +	return container_of(dma_dev, struct ldma_dev, dma_dev);
> +}
> +
> +static inline struct dw2_desc_sw *to_lgm_dma_desc(struct
> virt_dma_desc *vdesc)
> +{
> +	return container_of(vdesc, struct dw2_desc_sw, vdesc);
> +}
> +
> +static inline bool ldma_chan_tx(struct ldma_chan *c)
> +{
> +	return !!(c->flags & DMA_TX_CH);
> +}
> +
> +static inline bool ldma_chan_is_hw_desc(struct ldma_chan *c)
> +{
> +	return !!(c->flags & DMA_HW_DESC);
> +}
> +
> +static void ldma_dev_reset(struct ldma_dev *d)
> +
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, DMA_CTRL_RST, DMA_CTRL_RST, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_pkt_arb_cfg(struct ldma_dev *d, bool enable)
> +{
> +	unsigned long flags;
> +	u32 mask = DMA_CTRL_PKTARB;
> +	u32 val = enable ? DMA_CTRL_PKTARB : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_sram_desc_cfg(struct ldma_dev *d, bool enable)
> +{
> +	unsigned long flags;
> +	u32 mask = DMA_CTRL_DSRAM_PATH;
> +	u32 val = enable ? DMA_CTRL_DSRAM_PATH : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_chan_flow_ctl_cfg(struct ldma_dev *d, bool
> enable)
> +{
> +	unsigned long flags;
> +	u32 mask, val;
> +
> +	if (d->inst->type != DMA_TYPE_TX)
> +		return;
> +
> +	mask = DMA_CTRL_CH_FL;
> +	val = enable ? DMA_CTRL_CH_FL : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_global_polling_enable(struct ldma_dev *d)
> +{
> +	unsigned long flags;
> +	u32 mask = DMA_CPOLL_EN | DMA_CPOLL_CNT;
> +	u32 val = DMA_CPOLL_EN;
> +
> +	val |= FIELD_PREP(DMA_CPOLL_CNT, d->pollcnt);
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CPOLL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_desc_fetch_on_demand_cfg(struct ldma_dev *d,
> bool enable)
> +{
> +	unsigned long flags;
> +	u32 mask, val;
> +
> +	if (d->inst->type == DMA_TYPE_MCPY)
> +		return;
> +
> +	mask = DMA_CTRL_DS_FOD;
> +	val = enable ? DMA_CTRL_DS_FOD : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_byte_enable_cfg(struct ldma_dev *d, bool enable)
> +{
> +	unsigned long flags;
> +	u32 mask = DMA_CTRL_ENBE;
> +	u32 val = enable ? DMA_CTRL_ENBE : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +/*
> + * orr_cnt >= 16, it will be 16
> + * 4 <= orr_cnt < 16, it ill be orr_cnt
> + * orr_cnt < 4, it will be 3. Minimum 3 orr supported
> + */
> +static void ldma_dev_orrc_cfg(struct ldma_dev *d)
> +{
> +	unsigned long flags;
> +	u32 val = 0;
> +	u32 mask;
> +
> +	if (d->inst->type == DMA_TYPE_RX)
> +		return;
> +
> +	mask = DMA_ORRC_EN | DMA_ORRC_ORRCNT;
> +	if (d->orrc > 0 && d->orrc <= DMA_ORRC_MAX_CNT)
> +		val = DMA_ORRC_EN | FIELD_PREP(DMA_ORRC_ORRCNT, d->orrc);
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_ORRC);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_df_tout_cfg(struct ldma_dev *d, bool enable, int
> tcnt)
> +{
> +	u32 mask = DMA_CTRL_DESC_TMOUT_CNT_V31;
> +	unsigned long flags;
> +	u32 val;
> +
> +	if (enable)
> +		val = DMA_CTRL_DESC_TMOUT_EN_V31 |
> FIELD_PREP(DMA_CTRL_DESC_TMOUT_CNT_V31, tcnt);
> +	else
> +		val = 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_dburst_wr_cfg(struct ldma_dev *d, bool enable)
> +{
> +	unsigned long flags;
> +	u32 mask, val;
> +
> +	if (d->inst->type != DMA_TYPE_RX && d->inst->type !=
> DMA_TYPE_MCPY)
> +		return;
> +
> +	mask = DMA_CTRL_DBURST_WR;
> +	val = enable ? DMA_CTRL_DBURST_WR : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_vld_fetch_ack_cfg(struct ldma_dev *d, bool
> enable)
> +{
> +	unsigned long flags;
> +	u32 mask, val;
> +
> +	if (d->inst->type != DMA_TYPE_TX)
> +		return;
> +
> +	mask = DMA_CTRL_VLD_DF_ACK;
> +	val = enable ? DMA_CTRL_VLD_DF_ACK : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_dev_drb_cfg(struct ldma_dev *d, int enable)
> +{
> +	unsigned long flags;
> +	u32 mask = DMA_CTRL_DRB;
> +	u32 val = enable ? DMA_CTRL_DRB : 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, mask, val, DMA_CTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static int ldma_dev_cfg(struct ldma_dev *d)
> +{
> +	bool enable;
> +
> +	ldma_dev_pkt_arb_cfg(d, true);
> +	ldma_dev_global_polling_enable(d);
> +
> +	enable = !!(d->flags & DMA_DFT_DRB);
> +	ldma_dev_drb_cfg(d, enable);
> +
> +	enable = !!(d->flags & DMA_EN_BYTE_EN);
> +	ldma_dev_byte_enable_cfg(d, enable);
> +
> +	enable = !!(d->flags & DMA_CHAN_FLOW_CTL);
> +	ldma_dev_chan_flow_ctl_cfg(d, enable);
> +
> +	enable = !!(d->flags & DMA_DESC_FTOD);
> +	ldma_dev_desc_fetch_on_demand_cfg(d, enable);
> +
> +	enable = !!(d->flags & DMA_DESC_IN_SRAM);
> +	ldma_dev_sram_desc_cfg(d, enable);
> +
> +	enable = !!(d->flags & DMA_DBURST_WR);
> +	ldma_dev_dburst_wr_cfg(d, enable);
> +
> +	enable = !!(d->flags & DMA_VLD_FETCH_ACK);
> +	ldma_dev_vld_fetch_ack_cfg(d, enable);
> +
> +	if (d->ver > DMA_VER22) {
> +		ldma_dev_orrc_cfg(d);
> +		ldma_dev_df_tout_cfg(d, true, DMA_DFT_DESC_TCNT);
> +	}
> +
> +	dev_dbg(d->dev, "%s Controller 0x%08x configuration done\n",
> +		d->inst->name, readl(d->base + DMA_CTRL));
> +
> +	return 0;
> +}
> +
> +static int ldma_chan_cctrl_cfg(struct ldma_chan *c, u32 val)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 class_low, class_high;
> +	unsigned long flags;
> +	u32 reg;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	reg = readl(d->base + DMA_CCTRL);
> +	/* Read from hardware */
> +	if (reg & DMA_CCTRL_DIR_TX)
> +		c->flags |= DMA_TX_CH;
> +	else
> +		c->flags |= DMA_RX_CH;
> +
> +	/* Keep the class value unchanged */
> +	class_low = FIELD_GET(DMA_CCTRL_CLASS, reg);
> +	class_high = FIELD_GET(DMA_CCTRL_CLASSH, reg);
> +	val &= ~DMA_CCTRL_CLASS;
> +	val |= FIELD_PREP(DMA_CCTRL_CLASS, class_low);
> +	val &= ~DMA_CCTRL_CLASSH;
> +	val |= FIELD_PREP(DMA_CCTRL_CLASSH, class_high);
> +	writel(val, d->base + DMA_CCTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +
> +	return 0;
> +}
> +
> +static void ldma_chan_irq_init(struct ldma_chan *c)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +	u32 enofs, crofs;
> +	u32 cn_bit;
> +
> +	if (c->nr < MAX_LOWER_CHANS) {
> +		enofs = DMA_IRNEN;
> +		crofs = DMA_IRNCR;
> +	} else {
> +		enofs = DMA_IRNEN1;
> +		crofs = DMA_IRNCR1;
> +	}
> +
> +	cn_bit = BIT(c->nr & MASK_LOWER_CHANS);
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +
> +	/* Clear all interrupts and disabled it */
> +	writel(0, d->base + DMA_CIE);
> +	writel(DMA_CI_ALL, d->base + DMA_CIS);
> +
> +	ldma_update_bits(d, cn_bit, 0, enofs);
> +	writel(cn_bit, d->base + crofs);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void ldma_chan_set_class(struct ldma_chan *c, u32 val)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 class_val;
> +
> +	if (d->inst->type == DMA_TYPE_MCPY || val > DMA_MAX_CLASS)
> +		return;
> +
> +	/* 3 bits low */
> +	class_val = FIELD_PREP(DMA_CCTRL_CLASS, val & 0x7);
> +	/* 2 bits high */
> +	class_val |= FIELD_PREP(DMA_CCTRL_CLASSH, (val >> 3) & 0x3);
> +
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH,
> class_val,
> +			 DMA_CCTRL);
> +}
> +
> +static int ldma_chan_on(struct ldma_chan *c)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +
> +	/* If descriptors not configured, not allow to turn on channel */
> +	if (WARN_ON(!c->desc_init))
> +		return -EINVAL;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, DMA_CCTRL_ON, DMA_CCTRL_ON, DMA_CCTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +
> +	c->onoff = DMA_CH_ON;
> +
> +	return 0;
> +}
> +
> +static int ldma_chan_off(struct ldma_chan *c)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +	u32 val;
> +	int ret;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, DMA_CCTRL_ON, 0, DMA_CCTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +
> +	ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
> +					!(val & DMA_CCTRL_ON), 0, 10000);
> +	if (ret)
> +		return ret;
> +
> +	c->onoff = DMA_CH_OFF;
> +
> +	return 0;
> +}
> +
> +static void ldma_chan_desc_hw_cfg(struct ldma_chan *c, dma_addr_t
> desc_base,
> +				  int desc_num)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	writel(lower_32_bits(desc_base), d->base + DMA_CDBA);
> +
> +	/* Higher 4 bits of 36 bit addressing */
> +	if (IS_ENABLED(CONFIG_64BIT)) {
> +		u32 hi = upper_32_bits(desc_base) & HIGH_4_BITS;
> +
> +		ldma_update_bits(d, DMA_CDBA_MSB,
> +				 FIELD_PREP(DMA_CDBA_MSB, hi), DMA_CCTRL);
> +	}
> +	writel(desc_num, d->base + DMA_CDLEN);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +
> +	c->desc_init = true;
> +}
> +
> +/*
> + * Descriptor base address and data pointer must be physical address
> when
> + * writen to the register.
> + * This API will be used by CBM which configure hardware descriptor.
> + */
> +static int ldma_chan_desc_cfg(struct ldma_chan *c, dma_addr_t
> desc_base,
> +			      int desc_num)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +
> +	if (!desc_num) {
> +		dev_err(d->dev, "Channel %d must allocate descriptor
> first\n",
> +			c->nr);
> +		return -EINVAL;
> +	}
> +
> +	if (desc_num > DMA_MAX_DESC_NUM) {
> +		dev_err(d->dev, "Channel %d descriptor number out of range
> %d\n",
> +			c->nr, desc_num);
> +		return -EINVAL;
> +	}
> +
> +	ldma_chan_desc_hw_cfg(c, desc_base, desc_num);
> +
> +	c->flags |= DMA_HW_DESC;
> +	c->desc_cnt = desc_num;
> +	c->desc_phys = desc_base;
> +
> +	return 0;
> +}
> +
> +int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
> desc_base,
> +			    int desc_num)
> +{
> +	return ldma_chan_desc_cfg(to_ldma_chan(chan), desc_base,
> desc_num);
> +}
> +EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg);
> +
> +static int ldma_chan_reset(struct ldma_chan *c)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +	u32 val;
> +	int ret;
> +
> +	ret = ldma_chan_off(c);
> +	if (ret)
> +		return ret;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, DMA_CCTRL_RST, DMA_CCTRL_RST, DMA_CCTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +
> +	ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
> +					!(val & DMA_CCTRL_RST), 0, 10000);
> +	if (ret)
> +		return ret;
> +
> +	c->rst = 1;
> +	c->desc_init = false;
> +
> +	return 0;
> +}
> +
> +static void ldma_chan_byte_offset_cfg(struct ldma_chan *c, u32
> boff_len)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 mask = DMA_C_BOFF_EN | DMA_C_BOFF_BOF_LEN;
> +	u32 val;
> +
> +	if (boff_len > 0 && boff_len <= DMA_CHAN_BOFF_MAX)
> +		val = FIELD_PREP(DMA_C_BOFF_BOF_LEN, boff_len) |
> DMA_C_BOFF_EN;
> +	else
> +		val = 0;
> +
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, mask, val, DMA_C_BOFF);
> +}
> +
> +static void ldma_chan_data_endian_cfg(struct ldma_chan *c, bool
> enable,
> +				      u32 endian_type)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 mask = DMA_C_END_DE_EN | DMA_C_END_DATAENDI;
> +	u32 val;
> +
> +	if (enable)
> +		val = DMA_C_END_DE_EN | FIELD_PREP(DMA_C_END_DATAENDI,
> endian_type);
> +	else
> +		val = 0;
> +
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
> +}
> +
> +static void ldma_chan_desc_endian_cfg(struct ldma_chan *c, bool
> enable,
> +				      u32 endian_type)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 mask = DMA_C_END_DES_EN | DMA_C_END_DESENDI;
> +	u32 val;
> +
> +	if (enable)
> +		val = DMA_C_END_DES_EN | FIELD_PREP(DMA_C_END_DESENDI,
> endian_type);
> +	else
> +		val = 0;
> +
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
> +}
> +
> +static void ldma_chan_hdr_mode_cfg(struct ldma_chan *c, u32 hdr_len,
> bool csum)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 mask, val;
> +
> +	/* NB, csum disabled, hdr length must be provided */
> +	if (!csum && (!hdr_len || hdr_len > DMA_HDR_LEN_MAX))
> +		return;
> +
> +	mask = DMA_C_HDRM_HDR_SUM;
> +	val = DMA_C_HDRM_HDR_SUM;
> +
> +	if (!csum && hdr_len)
> +		val = hdr_len;
> +
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, mask, val, DMA_C_HDRM);
> +}
> +
> +static void ldma_chan_rxwr_np_cfg(struct ldma_chan *c, bool enable)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 mask, val;
> +
> +	/* Only valid for RX channel */
> +	if (ldma_chan_tx(c))
> +		return;
> +
> +	mask = DMA_CCTRL_WR_NP_EN;
> +	val = enable ? DMA_CCTRL_WR_NP_EN : 0;
> +
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, mask, val, DMA_CCTRL);
> +}
> +
> +static void ldma_chan_abc_cfg(struct ldma_chan *c, bool enable)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 mask, val;
> +
> +	if (d->ver < DMA_VER32 || ldma_chan_tx(c))
> +		return;
> +
> +	mask = DMA_CCTRL_CH_ABC;
> +	val = enable ? DMA_CCTRL_CH_ABC : 0;
> +
> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
> +	ldma_update_bits(d, mask, val, DMA_CCTRL);
> +}
> +
> +static int ldma_port_cfg(struct ldma_port *p)
> +{
> +	unsigned long flags;
> +	struct ldma_dev *d;
> +	u32 reg;
> +
> +	d = p->ldev;
> +	reg = FIELD_PREP(DMA_PCTRL_TXENDI, p->txendi);
> +	reg |= FIELD_PREP(DMA_PCTRL_RXENDI, p->rxendi);
> +
> +	if (d->ver == DMA_VER22) {
> +		reg |= FIELD_PREP(DMA_PCTRL_TXBL, p->txbl);
> +		reg |= FIELD_PREP(DMA_PCTRL_RXBL, p->rxbl);
> +	} else {
> +		reg |= FIELD_PREP(DMA_PCTRL_PDEN, p->pkt_drop);
> +
> +		if (p->txbl == DMA_BURSTL_32DW)
> +			reg |= DMA_PCTRL_TXBL32;
> +		else if (p->txbl == DMA_BURSTL_16DW)
> +			reg |= DMA_PCTRL_TXBL16;
> +		else
> +			reg |= FIELD_PREP(DMA_PCTRL_TXBL, DMA_PCTRL_TXBL_8);
> +
> +		if (p->rxbl == DMA_BURSTL_32DW)
> +			reg |= DMA_PCTRL_RXBL32;
> +		else if (p->rxbl == DMA_BURSTL_16DW)
> +			reg |= DMA_PCTRL_RXBL16;
> +		else
> +			reg |= FIELD_PREP(DMA_PCTRL_RXBL, DMA_PCTRL_RXBL_8);
> +	}
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	writel(p->portid, d->base + DMA_PS);
> +	writel(reg, d->base + DMA_PCTRL);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +
> +	reg = readl(d->base + DMA_PCTRL); /* read back */
> +	dev_dbg(d->dev, "Port Control 0x%08x configuration done\n", reg);
> +
> +	return 0;
> +}
> +
> +static int ldma_chan_cfg(struct ldma_chan *c)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +	u32 reg;
> +
> +	reg = c->pden ? DMA_CCTRL_PDEN : 0;
> +	reg |= c->onoff ? DMA_CCTRL_ON : 0;
> +	reg |= c->rst ? DMA_CCTRL_RST : 0;
> +
> +	ldma_chan_cctrl_cfg(c, reg);
> +	ldma_chan_irq_init(c);
> +
> +	if (d->ver <= DMA_VER22)
> +		return 0;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	ldma_chan_set_class(c, c->nr);
> +	ldma_chan_byte_offset_cfg(c, c->boff_len);
> +	ldma_chan_data_endian_cfg(c, c->data_endian_en, c->data_endian);
> +	ldma_chan_desc_endian_cfg(c, c->desc_endian_en, c->desc_endian);
> +	ldma_chan_hdr_mode_cfg(c, c->hdrm_len, c->hdrm_csum);
> +	ldma_chan_rxwr_np_cfg(c, c->desc_rx_np);
> +	ldma_chan_abc_cfg(c, c->abc_en);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +
> +	if (ldma_chan_is_hw_desc(c))
> +		ldma_chan_desc_hw_cfg(c, c->desc_phys, c->desc_cnt);
> +
> +	return 0;
> +}
> +
> +static void ldma_dev_init(struct ldma_dev *d)
> +{
> +	unsigned long ch_mask = (unsigned long)d->channels_mask;
> +	struct ldma_port *p;
> +	struct ldma_chan *c;
> +	int i;
> +	u32 j;
> +
> +	spin_lock_init(&d->dev_lock);
> +	ldma_dev_reset(d);
> +	ldma_dev_cfg(d);
> +
> +	/* DMA port initialization */
> +	for (i = 0; i < d->port_nrs; i++) {
> +		p = &d->ports[i];
> +		ldma_port_cfg(p);
> +	}
> +
> +	/* DMA channel initialization */
> +	for_each_set_bit(j, &ch_mask, d->chan_nrs) {
> +		c = &d->chans[j];
> +		ldma_chan_cfg(c);
> +	}
> +}
> +
> +static int ldma_cfg_init(struct ldma_dev *d)
> +{
> +	struct fwnode_handle *fwnode = dev_fwnode(d->dev);
> +	struct ldma_port *p;
> +	u32 val;
> +	int i;
> +
> +	if (fwnode_property_read_bool(fwnode, "intel,dma-chan-fc"))
> +		d->flags |= DMA_CHAN_FLOW_CTL;
> +
> +	if (fwnode_property_read_bool(fwnode, "intel,dma-desc-fod"))
> +		d->flags |= DMA_DESC_FTOD;
> +
> +	if (fwnode_property_read_bool(fwnode, "intel,dma-desc-in-sram"))
> +		d->flags |= DMA_DESC_IN_SRAM;
> +
> +	if (fwnode_property_read_bool(fwnode, "intel,dma-byte-en"))
> +		d->flags |= DMA_EN_BYTE_EN;
> +
> +	if (fwnode_property_read_bool(fwnode, "intel,dma-dfetch-ack"))
> +		d->flags |= DMA_VLD_FETCH_ACK;
> +
> +	if (fwnode_property_read_bool(fwnode, "intel,dma-dburst-wr"))
> +		d->flags |= DMA_DBURST_WR;
> +
> +	if (fwnode_property_read_bool(fwnode, "intel,dma-drb"))
> +		d->flags |= DMA_DFT_DRB;
> +
> +	if (fwnode_property_read_u32(fwnode, "intel,dma-poll-cnt",
> +				     &d->pollcnt))
> +		d->pollcnt = DMA_DFT_POLL_CNT;
> +
> +	if (!fwnode_property_read_u32(fwnode, "intel,dma-orrc", &val)) {
> +		if (val > DMA_ORRC_MAX_CNT)
> +			return -EINVAL;
> +		d->orrc = val;
> +	}
> +
> +	if (d->ver > DMA_VER22) {
> +		if (!d->port_nrs)
> +			return -EINVAL;
> +
> +		for (i = 0; i < d->port_nrs; i++) {
> +			p = &d->ports[i];
> +			p->rxendi = DMA_DFT_ENDIAN;
> +			p->txendi = DMA_DFT_ENDIAN;
> +			p->rxbl = DMA_DFT_BURST;
> +			p->txbl = DMA_DFT_BURST;
> +			p->pkt_drop = DMA_PKT_DROP_DIS;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void dma_free_desc_resource(struct virt_dma_desc *vdesc)
> +{
> +	struct dw2_desc_sw *ds = to_lgm_dma_desc(vdesc);
> +	struct ldma_chan *c = ds->chan;
> +
> +	dma_pool_free(c->desc_pool, ds->desc_hw, ds->desc_phys);
> +	kfree(ds);
> +}
> +
> +static struct dw2_desc_sw *
> +dma_alloc_desc_resource(int num, struct ldma_chan *c)
> +{
> +	struct device *dev = c->vchan.chan.device->dev;
> +	struct dw2_desc_sw *ds;
> +
> +	if (num > c->desc_num) {
> +		dev_err(dev, "sg num %d exceed max %d\n", num, c-
> >desc_num);
> +		return NULL;
> +	}
> +
> +	ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
> +	if (!ds)
> +		return NULL;
> +
> +	ds->chan = c;
> +	ds->desc_hw = dma_pool_zalloc(c->desc_pool, GFP_ATOMIC,
> +				      &ds->desc_phys);
> +	if (!ds->desc_hw) {
> +		dev_dbg(dev, "out of memory for link descriptor\n");
> +		kfree(ds);
> +		return NULL;
> +	}
> +	ds->desc_cnt = num;
> +
> +	return ds;
> +}
> +
> +static void ldma_chan_irq_en(struct ldma_chan *c)
> +{
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&d->dev_lock, flags);
> +	writel(c->nr, d->base + DMA_CS);
> +	writel(DMA_CI_EOP, d->base + DMA_CIE);
> +	writel(BIT(c->nr), d->base + DMA_IRNEN);
> +	spin_unlock_irqrestore(&d->dev_lock, flags);
> +}
> +
> +static void dma_issue_pending(struct dma_chan *chan)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	unsigned long flags;
> +
> +	if (d->ver == DMA_VER22) {
> +		spin_lock_irqsave(&c->vchan.lock, flags);
> +		if (vchan_issue_pending(&c->vchan)) {
> +			struct virt_dma_desc *vdesc;
> +
> +			/* Get the next descriptor */
> +			vdesc = vchan_next_desc(&c->vchan);
> +			if (!vdesc) {
> +				c->ds = NULL;
> +				spin_unlock_irqrestore(&c->vchan.lock, flags);
> +				return;
> +			}
> +			list_del(&vdesc->node);
> +			c->ds = to_lgm_dma_desc(vdesc);
> +			ldma_chan_desc_hw_cfg(c, c->ds->desc_phys, c->ds-
> >desc_cnt);
> +			ldma_chan_irq_en(c);
> +		}
> +		spin_unlock_irqrestore(&c->vchan.lock, flags);
> +	}
> +	ldma_chan_on(c);
> +}
> +
> +static void dma_synchronize(struct dma_chan *chan)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +
> +	/*
> +	 * clear any pending work if any. In that
> +	 * case the resource needs to be free here.
> +	 */
> +	cancel_work_sync(&c->work);
> +	vchan_synchronize(&c->vchan);
> +	if (c->ds)
> +		dma_free_desc_resource(&c->ds->vdesc);
> +}
> +
> +static int dma_terminate_all(struct dma_chan *chan)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +	unsigned long flags;
> +	LIST_HEAD(head);
> +
> +	spin_lock_irqsave(&c->vchan.lock, flags);
> +	vchan_get_all_descriptors(&c->vchan, &head);
> +	spin_unlock_irqrestore(&c->vchan.lock, flags);
> +	vchan_dma_desc_free_list(&c->vchan, &head);
> +
> +	return ldma_chan_reset(c);
> +}
> +
> +static int dma_resume_chan(struct dma_chan *chan)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +
> +	ldma_chan_on(c);
> +
> +	return 0;
> +}
> +
> +static int dma_pause_chan(struct dma_chan *chan)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +
> +	return ldma_chan_off(c);
> +}
> +
> +static enum dma_status
> +dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
> +	      struct dma_tx_state *txstate)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	enum dma_status status = DMA_COMPLETE;
> +
> +	if (d->ver == DMA_VER22)
> +		status = dma_cookie_status(chan, cookie, txstate);
> +
> +	return status;
> +}
> +
> +static void dma_chan_irq(int irq, void *data)
> +{
> +	struct ldma_chan *c = data;
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	u32 stat;
> +
> +	/* Disable channel interrupts  */
> +	writel(c->nr, d->base + DMA_CS);
> +	stat = readl(d->base + DMA_CIS);
> +	if (!stat)
> +		return;
> +
> +	writel(readl(d->base + DMA_CIE) & ~DMA_CI_ALL, d->base +
> DMA_CIE);
> +	writel(stat, d->base + DMA_CIS);
> +	queue_work(d->wq, &c->work);
> +}
> +
> +static irqreturn_t dma_interrupt(int irq, void *dev_id)
> +{
> +	struct ldma_dev *d = dev_id;
> +	struct ldma_chan *c;
> +	unsigned long irncr;
> +	u32 cid;
> +
> +	irncr = readl(d->base + DMA_IRNCR);
> +	if (!irncr) {
> +		dev_err(d->dev, "dummy interrupt\n");
> +		return IRQ_NONE;
> +	}
> +
> +	for_each_set_bit(cid, &irncr, d->chan_nrs) {
> +		/* Mask */
> +		writel(readl(d->base + DMA_IRNEN) & ~BIT(cid), d->base +
> DMA_IRNEN);
> +		/* Ack */
> +		writel(readl(d->base + DMA_IRNCR) | BIT(cid), d->base +
> DMA_IRNCR);
> +
> +		c = &d->chans[cid];
> +		dma_chan_irq(irq, c);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static void prep_slave_burst_len(struct ldma_chan *c)
> +{
> +	struct ldma_port *p = c->port;
> +	struct dma_slave_config *cfg = &c->config;
> +
> +	if (cfg->dst_maxburst)
> +		cfg->src_maxburst = cfg->dst_maxburst;
> +
> +	/* TX and RX has the same burst length */
> +	p->txbl = ilog2(cfg->src_maxburst);
> +	p->rxbl = p->txbl;
> +}
> +
> +static struct dma_async_tx_descriptor *
> +dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
> +		  unsigned int sglen, enum dma_transfer_direction dir,
> +		  unsigned long flags, void *context)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +	size_t len, avail, total = 0;
> +	struct dw2_desc *hw_ds;
> +	struct dw2_desc_sw *ds;
> +	struct scatterlist *sg;
> +	int num = sglen, i;
> +	dma_addr_t addr;
> +
> +	if (!sgl)
> +		return NULL;
> +
> +	for_each_sg(sgl, sg, sglen, i) {
> +		avail = sg_dma_len(sg);
> +		if (avail > DMA_MAX_SIZE)
> +			num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
> +	}
> +
> +	ds = dma_alloc_desc_resource(num, c);
> +	if (!ds)
> +		return NULL;
> +
> +	c->ds = ds;
> +
> +	num = 0;
> +	/* sop and eop has to be handled nicely */
> +	for_each_sg(sgl, sg, sglen, i) {
> +		addr = sg_dma_address(sg);
> +		avail = sg_dma_len(sg);
> +		total += avail;
> +
> +		do {
> +			len = min_t(size_t, avail, DMA_MAX_SIZE);
> +
> +			hw_ds = &ds->desc_hw[num];
> +			switch (sglen) {
> +			case 1:
> +				hw_ds->field.sop = 1;
> +				hw_ds->field.eop = 1;
> +				break;
> +			default:
> +				if (num == 0) {
> +					hw_ds->field.sop = 1;
> +					hw_ds->field.eop = 0;
> +				} else if (num == (sglen - 1)) {
> +					hw_ds->field.sop = 0;
> +					hw_ds->field.eop = 1;
> +				} else {
> +					hw_ds->field.sop = 0;
> +					hw_ds->field.eop = 0;
> +				}
> +				break;
> +			}
> +
> +			/* Only 32 bit address supported */
> +			hw_ds->addr = (u32)addr;
> +			hw_ds->field.len = len;
> +			hw_ds->field.c = 0;
> +			hw_ds->field.bofs = addr & 0x3;
> +			/* Ensure data ready before ownership change */
> +			wmb();
> +			hw_ds->field.own = DMA_OWN;
> +			/* Ensure ownership changed before moving forward */
> +			wmb();
> +			num++;
> +			addr += len;
> +			avail -= len;
> +		} while (avail);
> +	}
> +
> +	ds->size = total;
> +	prep_slave_burst_len(c);
> +
> +	return vchan_tx_prep(&c->vchan, &ds->vdesc, DMA_CTRL_ACK);
> +}
> +
> +static int
> +dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +
> +	memcpy(&c->config, cfg, sizeof(c->config));
> +
> +	return 0;
> +}
> +
> +static int dma_alloc_chan_resources(struct dma_chan *chan)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +	struct device *dev = c->vchan.chan.device->dev;
> +	size_t	desc_sz;
> +
> +	if (d->ver > DMA_VER22) {
> +		c->flags |= CHAN_IN_USE;
> +		return 0;
> +	}
> +
> +	if (c->desc_pool)
> +		return c->desc_num;
> +
> +	desc_sz = c->desc_num * sizeof(struct dw2_desc);
> +	c->desc_pool = dma_pool_create(c->name, dev, desc_sz,
> +				       __alignof__(struct dw2_desc), 0);
> +
> +	if (!c->desc_pool) {
> +		dev_err(dev, "unable to allocate descriptor pool\n");
> +		return -ENOMEM;
> +	}
> +
> +	return c->desc_num;
> +}
> +
> +static void dma_free_chan_resources(struct dma_chan *chan)
> +{
> +	struct ldma_chan *c = to_ldma_chan(chan);
> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
> +
> +	if (d->ver == DMA_VER22) {
> +		dma_pool_destroy(c->desc_pool);
> +		c->desc_pool = NULL;
> +		vchan_free_chan_resources(to_virt_chan(chan));
> +		ldma_chan_reset(c);
> +	} else {
> +		c->flags &= ~CHAN_IN_USE;
> +	}
> +}
> +
> +static void dma_work(struct work_struct *work)
> +{
> +	struct ldma_chan *c = container_of(work, struct ldma_chan, work);
> +	struct dma_async_tx_descriptor *tx = &c->ds->vdesc.tx;
> +	struct virt_dma_chan *vc = &c->vchan;
> +	struct dmaengine_desc_callback cb;
> +	struct virt_dma_desc *vd, *_vd;
> +	unsigned long flags;
> +	LIST_HEAD(head);
> +
> +	spin_lock_irqsave(&c->vchan.lock, flags);
> +	list_splice_tail_init(&vc->desc_completed, &head);
> +	spin_unlock_irqrestore(&c->vchan.lock, flags);
> +	dmaengine_desc_get_callback(tx, &cb);
> +	dma_cookie_complete(tx);
> +	dmaengine_desc_callback_invoke(&cb, NULL);
> +
> +	list_for_each_entry_safe(vd, _vd, &head, node) {
> +		dmaengine_desc_get_callback(tx, &cb);
> +		dma_cookie_complete(tx);
> +		list_del(&vd->node);
> +		dmaengine_desc_callback_invoke(&cb, NULL);
> +
> +		vchan_vdesc_fini(vd);
> +	}
> +	c->ds = NULL;
> +}
> +
> +static void
> +update_burst_len_v22(struct ldma_chan *c, struct ldma_port *p, u32
> burst)
> +{
> +	if (ldma_chan_tx(c))
> +		p->txbl = ilog2(burst);
> +	else
> +		p->rxbl = ilog2(burst);
> +}
> +
> +static void
> +update_burst_len_v3X(struct ldma_chan *c, struct ldma_port *p, u32
> burst)
> +{
> +	if (ldma_chan_tx(c))
> +		p->txbl = burst;
> +	else
> +		p->rxbl = burst;
> +}
> +
> +static int
> +update_client_configs(struct of_dma *ofdma, struct of_phandle_args
> *spec)
> +{
> +	struct ldma_dev *d = ofdma->of_dma_data;
> +	u32 chan_id =  spec->args[0];
> +	u32 port_id =  spec->args[1];
> +	u32 burst = spec->args[2];
> +	struct ldma_port *p;
> +	struct ldma_chan *c;
> +
> +	if (chan_id >= d->chan_nrs || port_id >= d->port_nrs)
> +		return 0;
> +
> +	p = &d->ports[port_id];
> +	c = &d->chans[chan_id];
> +	c->port = p;
> +
> +	if (d->ver == DMA_VER22)
> +		update_burst_len_v22(c, p, burst);
> +	else
> +		update_burst_len_v3X(c, p, burst);
> +
> +	ldma_port_cfg(p);
> +
> +	return 1;
> +}
> +
> +static struct dma_chan *ldma_xlate(struct of_phandle_args *spec,
> +				   struct of_dma *ofdma)
> +{
> +	struct ldma_dev *d = ofdma->of_dma_data;
> +	u32 chan_id =  spec->args[0];
> +	int ret;
> +
> +	if (!spec->args_count)
> +		return NULL;
> +
> +	/* if args_count is 1 driver use default settings */
> +	if (spec->args_count > 1) {
> +		ret = update_client_configs(ofdma, spec);
> +		if (!ret)
> +			return NULL;
> +	}
> +
> +	return dma_get_slave_channel(&d->chans[chan_id].vchan.chan);
> +}
> +
> +static void ldma_dma_init_v22(int i, struct ldma_dev *d)
> +{
> +	struct ldma_chan *c;
> +
> +	c = &d->chans[i];
> +	c->nr = i; /* Real channel number */
> +	c->rst = DMA_CHAN_RST;
> +	c->desc_num = DMA_DFT_DESC_NUM;
> +	snprintf(c->name, sizeof(c->name), "chan%d", c->nr);
> +	INIT_WORK(&c->work, dma_work);
> +	c->vchan.desc_free = dma_free_desc_resource;
> +	vchan_init(&c->vchan, &d->dma_dev);
> +}
> +
> +static void ldma_dma_init_v3X(int i, struct ldma_dev *d)
> +{
> +	struct ldma_chan *c;
> +
> +	c = &d->chans[i];
> +	c->data_endian = DMA_DFT_ENDIAN;
> +	c->desc_endian = DMA_DFT_ENDIAN;
> +	c->data_endian_en = false;
> +	c->desc_endian_en = false;
> +	c->desc_rx_np = false;
> +	c->flags |= DEVICE_ALLOC_DESC;
> +	c->onoff = DMA_CH_OFF;
> +	c->rst = DMA_CHAN_RST;
> +	c->abc_en = true;
> +	c->hdrm_csum = false;
> +	c->boff_len = 0;
> +	c->nr = i;
> +	c->vchan.desc_free = dma_free_desc_resource;
> +	vchan_init(&c->vchan, &d->dma_dev);
> +}
> +
> +static int ldma_init_v22(struct ldma_dev *d, struct platform_device
> *pdev)
> +{
> +	int ret;
> +
> +	ret = device_property_read_u32(d->dev, "dma-channels", &d-
> >chan_nrs);
> +	if (ret < 0) {
> +		dev_err(d->dev, "unable to read dma-channels property\n");
> +		return ret;
> +	}
> +
> +	d->irq = platform_get_irq(pdev, 0);
> +	if (d->irq < 0)
> +		return d->irq;
> +
> +	ret = devm_request_irq(&pdev->dev, d->irq, dma_interrupt, 0,
> +			       DRIVER_NAME, d);
> +	if (ret)
> +		return ret;
> +
> +	d->wq = alloc_ordered_workqueue("dma_wq", WQ_MEM_RECLAIM |
> +			WQ_HIGHPRI);
> +	if (!d->wq)
> +		return -ENOMEM;
> +
> +	return 0;
> +}
> +
> +static void ldma_clk_disable(void *data)
> +{
> +	struct ldma_dev *d = data;
> +
> +	clk_disable_unprepare(d->core_clk);
> +	reset_control_assert(d->rst);
> +}
> +
> +static struct dma_dev_ops dma0_ops = {
> +	.device_alloc_chan_resources = dma_alloc_chan_resources,
> +	.device_free_chan_resources = dma_free_chan_resources,
> +	.device_config = dma_slave_config,
> +	.device_prep_slave_sg = dma_prep_slave_sg,
> +	.device_tx_status = dma_tx_status,
> +	.device_pause = dma_pause_chan,
> +	.device_resume = dma_resume_chan,
> +	.device_terminate_all = dma_terminate_all,
> +	.device_synchronize = dma_synchronize,
> +	.device_issue_pending = dma_issue_pending,
> +};
> +
> +static struct dma_dev_ops hdma_ops = {
> +	.device_alloc_chan_resources = dma_alloc_chan_resources,
> +	.device_free_chan_resources = dma_free_chan_resources,
> +	.device_terminate_all = dma_terminate_all,
> +	.device_issue_pending = dma_issue_pending,
> +	.device_tx_status = dma_tx_status,
> +	.device_resume = dma_resume_chan,
> +	.device_pause = dma_pause_chan,
> +};

It is not easy to see, as the ordering is different, but all the functions
for hdma_ops are the same as for dma0_ops. And these structs are only used
as template, assigning the function pointers one by one to the dma_device struct.
So why not assign the functions directly in the probe function,
with a check for "dma0" on the slave functions?
Anyway, if you keep this, you should change them to "const".

> +
> +static const struct ldma_inst_data dma0 = {
> +	.name = "dma0",
> +	.ops = &dma0_ops,
> +};
> +
> +static const struct ldma_inst_data dma2tx = {
> +	.name = "dma2tx",
> +	.type = DMA_TYPE_TX,
> +	.ops = &hdma_ops,
> +};
> +
> +static const struct ldma_inst_data dma1rx = {
> +	.name = "dma1rx",
> +	.type = DMA_TYPE_RX,
> +	.ops = &hdma_ops,
> +};
> +
> +static const struct ldma_inst_data dma1tx = {
> +	.name = "dma1tx",
> +	.type = DMA_TYPE_TX,
> +	.ops = &hdma_ops,
> +};
> +
> +static const struct ldma_inst_data dma0tx = {
> +	.name = "dma0tx",
> +	.type = DMA_TYPE_TX,
> +	.ops = &hdma_ops,
> +};
> +
> +static const struct ldma_inst_data dma3 = {
> +	.name = "dma3",
> +	.type = DMA_TYPE_MCPY,
> +	.ops = &hdma_ops,
> +};
> +
> +static const struct ldma_inst_data toe_dma30 = {
> +	.name = "toe_dma30",
> +	.type = DMA_TYPE_MCPY,
> +	.ops = &hdma_ops,
> +};
> +
> +static const struct ldma_inst_data toe_dma31 = {
> +	.name = "toe_dma31",
> +	.type = DMA_TYPE_MCPY,
> +	.ops = &hdma_ops,
> +};
> +
> +static const struct of_device_id intel_ldma_match[] = {
> +	{ .compatible = "intel,lgm-cdma", .data = &dma0},
> +	{ .compatible = "intel,lgm-dma2tx", .data = &dma2tx},
> +	{ .compatible = "intel,lgm-dma1rx", .data = &dma1rx},
> +	{ .compatible = "intel,lgm-dma1tx", .data = &dma1tx},
> +	{ .compatible = "intel,lgm-dma0tx", .data = &dma0tx},
> +	{ .compatible = "intel,lgm-dma3", .data = &dma3},
> +	{ .compatible = "intel,lgm-toe-dma30", .data = &toe_dma30},
> +	{ .compatible = "intel,lgm-toe-dma31", .data = &toe_dma31},
> +	{}
> +};

If you accept the suggestion I did on the binding, the ".data" should
probably point directly to the ".ops", or just a flag for the type.
Which also makes the "name" in the structs obsolete, as they are not
per instance anymore.

> +
> +static int intel_ldma_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct dma_device *dma_dev;
> +	unsigned long ch_mask;
> +	struct ldma_chan *c;
> +	struct ldma_port *p;
> +	struct ldma_dev *d;
> +	u32 id, bitn = 32, j;
> +	int i, ret;
> +
> +	d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
> +	if (!d)
> +		return -ENOMEM;
> +
> +	/* Link controller to platform device */
> +	d->dev = &pdev->dev;
> +
> +	d->inst = device_get_match_data(dev);
> +	if (!d->inst) {
> +		dev_err(dev, "No device match found\n");
> +		return -ENODEV;
> +	}
> +
> +	d->base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(d->base))
> +		return PTR_ERR(d->base);
> +
> +	/* Power up and reset the dma engine, some DMAs always on?? */
> +	d->core_clk = devm_clk_get_optional(dev, NULL);
> +	if (IS_ERR(d->core_clk))
> +		return PTR_ERR(d->core_clk);
> +	clk_prepare_enable(d->core_clk);
> +
> +	d->rst = devm_reset_control_get_optional(dev, NULL);
> +	if (IS_ERR(d->rst))
> +		return PTR_ERR(d->rst);
> +	reset_control_deassert(d->rst);
> +
> +	ret = devm_add_action_or_reset(dev, ldma_clk_disable, d);
> +	if (ret) {
> +		dev_err(dev, "Failed to devm_add_action_or_reset, %d\n",
> ret);
> +		return ret;
> +	}
> +
> +	id = readl(d->base + DMA_ID);
> +	d->chan_nrs = FIELD_GET(DMA_ID_CHNR, id);
> +	d->port_nrs = FIELD_GET(DMA_ID_PNR, id);
> +	d->ver = FIELD_GET(DMA_ID_REV, id);
> +
> +	if (id & DMA_ID_AW_36B)
> +		d->flags |= DMA_ADDR_36BIT;
> +
> +	if (IS_ENABLED(CONFIG_64BIT) && (id & DMA_ID_AW_36B))
> +		bitn = 36;
> +
> +	if (id & DMA_ID_DW_128B)
> +		d->flags |= DMA_DATA_128BIT;
> +
> +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(bitn));
> +	if (ret) {
> +		dev_err(dev, "No usable DMA configuration\n");
> +		return ret;
> +	}
> +
> +	if (d->ver == DMA_VER22) {
> +		ret = ldma_init_v22(d, pdev);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = device_property_read_u32(dev, "dma-channel-mask", &d-
> >channels_mask);
> +	if (ret < 0)
> +		d->channels_mask = GENMASK(d->chan_nrs - 1, 0);
> +
> +	dma_dev = &d->dma_dev;
> +
> +	dma_cap_zero(dma_dev->cap_mask);
> +	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
> +
> +	/* Channel initializations */
> +	INIT_LIST_HEAD(&dma_dev->channels);
> +
> +	/* Port Initializations */
> +	d->ports = devm_kcalloc(dev, d->port_nrs, sizeof(*p),
> GFP_KERNEL);
> +	if (!d->ports)
> +		return -ENOMEM;
> +
> +	/* Channels Initializations */
> +	d->chans = devm_kcalloc(d->dev, d->chan_nrs, sizeof(*c),
> GFP_KERNEL);
> +	if (!d->chans)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < d->port_nrs; i++) {
> +		p = &d->ports[i];
> +		p->portid = i;
> +		p->ldev = d;
> +	}
> +
> +	ret = ldma_cfg_init(d);
> +	if (ret)
> +		return ret;
> +
> +	dma_dev->dev = &pdev->dev;
> +
> +	ch_mask = (unsigned long)d->channels_mask;
> +	for_each_set_bit(j, &ch_mask, d->chan_nrs) {
> +		if (d->ver == DMA_VER22)
> +			ldma_dma_init_v22(j, d);
> +		else
> +			ldma_dma_init_v3X(j, d);
> +	}
> +
> +	dma_dev->device_alloc_chan_resources =
> +		d->inst->ops->device_alloc_chan_resources;
> +	dma_dev->device_free_chan_resources =
> +		d->inst->ops->device_free_chan_resources;
> +	dma_dev->device_terminate_all = d->inst->ops-
> >device_terminate_all;
> +	dma_dev->device_issue_pending = d->inst->ops-
> >device_issue_pending;
> +	dma_dev->device_tx_status = d->inst->ops->device_tx_status;
> +	dma_dev->device_resume = d->inst->ops->device_resume;
> +	dma_dev->device_pause = d->inst->ops->device_pause;
> +	dma_dev->device_config = d->inst->ops->device_config;
> +	dma_dev->device_prep_slave_sg = d->inst->ops-
> >device_prep_slave_sg;
> +	dma_dev->device_synchronize = d->inst->ops->device_synchronize;
> +
> +	if (d->ver == DMA_VER22) {
> +		dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
> +		dma_dev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
> +		dma_dev->directions = BIT(DMA_MEM_TO_DEV) |
> +				      BIT(DMA_DEV_TO_MEM);
> +		dma_dev->residue_granularity =
> +					DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
> +	}
> +
> +	platform_set_drvdata(pdev, d);
> +
> +	ldma_dev_init(d);
> +
> +	ret = dma_async_device_register(dma_dev);
> +	if (ret) {
> +		dev_err(dev, "Failed to register slave DMA engine
> device\n");
> +		return ret;
> +	}
> +
> +	ret = of_dma_controller_register(pdev->dev.of_node, ldma_xlate,
> d);
> +	if (ret) {
> +		dev_err(dev, "Failed to register of DMA controller\n");
> +		dma_async_device_unregister(dma_dev);
> +		return ret;
> +	}
> +
> +	dev_info(dev, "Init done - rev: %x, ports: %d channels: %d\n", d-
> >ver,
> +		 d->port_nrs, d->chan_nrs);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver intel_ldma_driver = {
> +	.probe = intel_ldma_probe,
> +	.driver = {
> +		.name = DRIVER_NAME,
> +		.of_match_table = intel_ldma_match,
> +	},
> +};
> +
> +/*
> + * Perform this driver as device_initcall to make sure initialization
> happens
> + * before its DMA clients of some are platform specific and also to
> provide
> + * registered DMA channels and DMA capabilities to clients before
> their
> + * initialization.
> + */
> +static int __init intel_ldma_init(void)
> +{
> +	return platform_driver_register(&intel_ldma_driver);
> +}
> +
> +device_initcall(intel_ldma_init);
> diff --git a/include/linux/dma/lgm_dma.h b/include/linux/dma/lgm_dma.h
> new file mode 100644
> index 000000000000..3a2ee6ad0710
> --- /dev/null
> +++ b/include/linux/dma/lgm_dma.h
> @@ -0,0 +1,27 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2016 ~ 2019 Intel Corporation.

We already have 2020

> + */
> +#ifndef LGM_DMA_H
> +#define LGM_DMA_H
> +
> +#include <linux/types.h>
> +#include <linux/dmaengine.h>
> +
> +/*!
> + * \fn int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
> desc_base,
> + *                                 int desc_num)
> + * \brief Configure low level channel descriptors
> + * \param[in] chan   pointer to DMA channel that the client is using
> + * \param[in] desc_base   descriptor base physical address
> + * \param[in] desc_num   number of descriptors
> + * \return   0 on success
> + * \return   kernel bug reported on failure
> + *
> + * This function configure the low level channel descriptors. It will
> be
> + * used by CBM whose descriptor is not DDR, actually some registers.

The term "CBM" is not known to the community.
If this is needed for the CBM driver, I would suggest adding it together with that driver.

> + */
> +int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
> desc_base,
> +			    int desc_num);
> +
> +#endif /* LGM_DMA_H */
> --
> 2.11.0


Best regards,
Thomas

Re: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel LGM SOC

[Rob Herring]

On Tue, 27 Oct 2020 16:03:06 +0800, Amireddy Mallikarjuna reddy wrote:
> Add DT bindings YAML schema for DMA controller driver
> of Lightning Mountain(LGM) SoC.
> 
> Signed-off-by: Amireddy Mallikarjuna reddy <mallikarjunax.reddy@linux.intel.com>
> ---
> v1:
> - Initial version.
> 
> v2:
> - Fix bot errors.
> 
> v3:
> - No change.
> 
> v4:
> - Address Thomas langer comments
>   - use node name pattern as dma-controller as in common binding.
>   - Remove "_" (underscore) in instance name.
>   - Remove "port-" and "chan-" in attribute name for both 'dma-ports' & 'dma-channels' child nodes.
> 
> v5:
> - Moved some of the attributes in 'dma-ports' & 'dma-channels' child nodes to dma client/consumer side as cells in 'dmas' properties.
> 
> v6:
> - Add additionalProperties: false
> - completely removed 'dma-ports' and 'dma-channels' child nodes.
> - Moved channel dt properties to client side dmas.
> - Use standard dma-channels and dma-channel-mask properties.
> - Documented reset-names
> - Add description for dma-cells
> 
> v7:
> - modified compatible to oneof
> - Reduced number of dma-cells to 3
> - Fine tune the description of some properties.
> ---
>  .../devicetree/bindings/dma/intel,ldma.yaml        | 135 +++++++++++++++++++++
>  1 file changed, 135 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/intel,ldma.yaml
> 


My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:17:2: [warning] wrong indentation: expected 2 but found 1 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:21:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:22:4: [warning] wrong indentation: expected 4 but found 3 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:32:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:35:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:37:6: [warning] wrong indentation: expected 4 but found 5 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:42:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:46:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:50:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:53:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:56:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:60:3: [warning] wrong indentation: expected 3 but found 2 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:76:5: [warning] wrong indentation: expected 3 but found 4 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:81:5: [warning] wrong indentation: expected 3 but found 4 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:83:8: [warning] wrong indentation: expected 6 but found 7 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:87:5: [warning] wrong indentation: expected 3 but found 4 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:89:8: [warning] wrong indentation: expected 6 but found 7 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:93:5: [warning] wrong indentation: expected 3 but found 4 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:95:8: [warning] wrong indentation: expected 6 but found 7 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:100:2: [warning] wrong indentation: expected 2 but found 1 (indentation)
./Documentation/devicetree/bindings/dma/intel,ldma.yaml:107:2: [warning] wrong indentation: expected 2 but found 1 (indentation)

dtschema/dtc warnings/errors:


See https://patchwork.ozlabs.org/patch/1388332

The base for the patch is generally the last rc1. Any dependencies
should be noted.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit.

Re: [PATCH v7 2/2] Add Intel LGM soc DMA support.

[Reddy, MallikarjunaX]

Hi Thomas,
Thanks for valuable review, My comments inline.

On 10/28/2020 3:24 AM, Thomas Langer wrote:
> Hello Reddy,
>
> some comments below. I only commented regarding some structural things,
> as I am not so familiar with the functional side of DMA.
>
>> -----Original Message-----
>> From: Amireddy Mallikarjuna reddy
>> <mallikarjunax.reddy@linux.intel.com>
>> Sent: Dienstag, 27. Oktober 2020 09:03
>> To: dmaengine@vger.kernel.org; vkoul@kernel.org;
>> devicetree@vger.kernel.org; robh+dt@kernel.org
>> Cc: linux-kernel@vger.kernel.org; Shevchenko, Andriy
>> <andriy.shevchenko@intel.com>; chuanhua.lei@linux.intel.com; Kim,
>> Cheol Yong <cheol.yong.kim@intel.com>; Wu, Qiming <qi-
>> ming.wu@intel.com>; mallikarjunax.reddy@linux.intel.com;
>> malliamireddy009@gmail.com; peter.ujfalusi@ti.com
>> Subject: [PATCH v7 2/2] Add Intel LGM soc DMA support.
>>
>> Add DMA controller driver for Lightning Mountain(LGM) family of SoCs.
>>
>> The main function of the DMA controller is the transfer of data
>> from/to any
>> DPlus compliant peripheral to/from the memory. A memory to memory copy
>> capability can also be configured.
> What is "DPlus compliant"? This needs some explanation.
HAS Document described D+ or Dplus as 'Proprietary Parallel Data 
Interface for DMA and Peripherals'

To make the things simple can change the description like this.
'The main function of the DMA controller is the transfer of data from/to 
any peripheral to/from the memory.'
>
>> This ldma driver is used for configure the device and channnels for
>> data
>> and control paths.
>>
>> Signed-off-by: Amireddy Mallikarjuna reddy
>> <mallikarjunax.reddy@linux.intel.com>
>> ---
>> v1:
>> - Initial version.
>>
>> v2:
>> - Fix device tree bot issues, correspondign driver changes done.
>> - Fix kerntel test robot warnings.
>>    --------------------------------------------------------
>>    >> drivers/dma/lgm/lgm-dma.c:729:5: warning: no previous prototype
>> for function 'intel_dma_chan_desc_cfg' [-Wmissing-prototypes]
>>    int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
>> desc_base,
>>    ^
>>    drivers/dma/lgm/lgm-dma.c:729:1: note: declare 'static' if the
>> function is not intended to be used outside of this translation unit
>>    int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
>> desc_base,
>>    ^
>>    static
>>    1 warning generated.
>>
>>    vim +/intel_dma_chan_desc_cfg +729 drivers/dma/lgm/lgm-dma.c
>>
>>      728
>>    > 729 int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
>> desc_base,
>>      730                             int desc_num)
>>      731 {
>>      732         return ldma_chan_desc_cfg(to_ldma_chan(chan),
>> desc_base, desc_num);
>>      733 }
>>      734 EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg);
>>      735
>>
>>     Reported-by: kernel test robot <lkp@intel.com>
>>     ---------------------------------------------------------------
>>
>> v3:
>> - Fix smatch warning.
>>    ----------------------------------------------------------------
>>    smatch warnings:
>>    drivers/dma/lgm/lgm-dma.c:1306 ldma_cfg_init() error: uninitialized
>> symbol 'ret'.
>>
>>    Reported-by: kernel test robot <lkp@intel.com>
>>    Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>>    ----------------------------------------------------------------
>>
>> v4:
>> - Address Thomas Langer comments in dtbinding and corresponding driver
>> side changes.
>> - Driver side changes to corresponding device tree changes.
>>
>> v5:
>> - Add changes to read 'dmas' properties and update the config
>> properties driver side.
>> - Add virt_dma_desc utilizes virt-dma API.
>>
>> v6:
>> - Driver changes corresponding to the device tree changes.
>> - Restructure things to have less activity with the spinlock.
>> - Save the slave config in dma_slave_config() and used in prepare
>> time.
>> - Addressed & fixed issues related to desc_free callback _free_ up the
>> memory.
>> - Addressed peter review comments.
>>
>> v7:
>> - Change bool to tristate in Kconfig
> I see this "tristate" (compile as module) and the explanation
> for the _initcall confusing. Either this is a driver for the SoC
> that must be available early or it can be used as module (which
> is typically loaded late). You cannot fulfill both things.
For LGM Soc it must be available early. I will update accordingly.
>
>> - Explained the _initcall()
>> - change of_property*() to device_property_*()
>> - split the code to functions at version checks
>> - Remove the dma caller capability restrictions
>> - used for_each_set_bit()
>> - Addressed minor comments and fine tune the code.
>> ---
>>   drivers/dma/Kconfig         |    2 +
>>   drivers/dma/Makefile        |    1 +
>>   drivers/dma/lgm/Kconfig     |    9 +
>>   drivers/dma/lgm/Makefile    |    2 +
>>   drivers/dma/lgm/lgm-dma.c   | 1765
>> +++++++++++++++++++++++++++++++++++++++++++
>>   include/linux/dma/lgm_dma.h |   27 +
>>   6 files changed, 1806 insertions(+)
>>   create mode 100644 drivers/dma/lgm/Kconfig
>>   create mode 100644 drivers/dma/lgm/Makefile
>>   create mode 100644 drivers/dma/lgm/lgm-dma.c
>>   create mode 100644 include/linux/dma/lgm_dma.h
>>
>> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
>> index de41d7928bff..caeaf12fd524 100644
>> --- a/drivers/dma/Kconfig
>> +++ b/drivers/dma/Kconfig
>> @@ -737,6 +737,8 @@ source "drivers/dma/ti/Kconfig"
>>
>>   source "drivers/dma/fsl-dpaa2-qdma/Kconfig"
>>
>> +source "drivers/dma/lgm/Kconfig"
>> +
>>   # clients
>>   comment "DMA Clients"
>>   	depends on DMA_ENGINE
>> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
>> index e60f81331d4c..0b899b076f4e 100644
>> --- a/drivers/dma/Makefile
>> +++ b/drivers/dma/Makefile
>> @@ -83,6 +83,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
>>   obj-$(CONFIG_ZX_DMA) += zx_dma.o
>>   obj-$(CONFIG_ST_FDMA) += st_fdma.o
>>   obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/
>> +obj-$(CONFIG_INTEL_LDMA) += lgm/
>>
>>   obj-y += mediatek/
>>   obj-y += qcom/
>> diff --git a/drivers/dma/lgm/Kconfig b/drivers/dma/lgm/Kconfig
>> new file mode 100644
>> index 000000000000..bdb5b0d91afb
>> --- /dev/null
>> +++ b/drivers/dma/lgm/Kconfig
>> @@ -0,0 +1,9 @@
>> +# SPDX-License-Identifier: GPL-2.0-only
>> +config INTEL_LDMA
>> +	bool "Lightning Mountain centralized low speed DMA and high speed
>> DMA controllers"
>> +	select DMA_ENGINE
>> +	select DMA_VIRTUAL_CHANNELS
>> +	help
>> +	  Enable support for intel Lightning Mountain SOC DMA
>> controllers.
>> +	  These controllers provide DMA capabilities for a variety of on-
>> chip
>> +	  devices such as SSC, HSNAND and GSWIP.
>> diff --git a/drivers/dma/lgm/Makefile b/drivers/dma/lgm/Makefile
>> new file mode 100644
>> index 000000000000..f318a8eff464
>> --- /dev/null
>> +++ b/drivers/dma/lgm/Makefile
>> @@ -0,0 +1,2 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +obj-$(CONFIG_INTEL_LDMA)	+= lgm-dma.o
>> diff --git a/drivers/dma/lgm/lgm-dma.c b/drivers/dma/lgm/lgm-dma.c
>> new file mode 100644
>> index 000000000000..bd9bd450a50a
>> --- /dev/null
>> +++ b/drivers/dma/lgm/lgm-dma.c
>> @@ -0,0 +1,1765 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Lightning Mountain centralized low speed and high speed DMA
>> controller driver
>> + *
>> + * Copyright (c) 2016 ~ 2020 Intel Corporation.
>> + */
>> +
>> +#include <linux/bitfield.h>
>> +#include <linux/clk.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/dmapool.h>
>> +#include <linux/dma/lgm_dma.h>
>> +#include <linux/err.h>
>> +#include <linux/export.h>
>> +#include <linux/init.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/of_dma.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/reset.h>
>> +
>> +#include "../dmaengine.h"
>> +#include "../virt-dma.h"
>> +
>> +#define DRIVER_NAME			"lgm-ldma"
> Why "ldma"? Same applies to most functions with the prefix "ldma_".
i will use file name as DRIVER_NAME.

#define DRIVER_NAME "lgm-dma"

is it ok or do you have any suggestions.
>
>> +
>> +#define DMA_ID				0x0008
>> +#define DMA_ID_REV			GENMASK(7, 0)
>> +#define DMA_ID_PNR			GENMASK(19, 16)
>> +#define DMA_ID_CHNR			GENMASK(26, 20)
>> +#define DMA_ID_DW_128B			BIT(27)
>> +#define DMA_ID_AW_36B			BIT(28)
>> +#define DMA_VER32			0x32
>> +#define DMA_VER31			0x31
>> +#define DMA_VER22			0x0A
>> +
>> +#define DMA_CTRL			0x0010
>> +#define DMA_CTRL_RST			BIT(0)
>> +#define DMA_CTRL_DSRAM_PATH		BIT(1)
>> +#define DMA_CTRL_DBURST_WR		BIT(3)
>> +#define DMA_CTRL_VLD_DF_ACK		BIT(4)
>> +#define DMA_CTRL_CH_FL			BIT(6)
>> +#define DMA_CTRL_DS_FOD			BIT(7)
>> +#define DMA_CTRL_DRB			BIT(8)
>> +#define DMA_CTRL_ENBE			BIT(9)
>> +#define DMA_CTRL_DESC_TMOUT_CNT_V31	GENMASK(27, 16)
>> +#define DMA_CTRL_DESC_TMOUT_EN_V31	BIT(30)
>> +#define DMA_CTRL_PKTARB			BIT(31)
>> +
>> +#define DMA_CPOLL			0x0014
>> +#define DMA_CPOLL_CNT			GENMASK(15, 4)
>> +#define DMA_CPOLL_EN			BIT(31)
>> +
>> +#define DMA_CS				0x0018
>> +#define DMA_CS_MASK			GENMASK(5, 0)
>> +
>> +#define DMA_CCTRL			0x001C
>> +#define DMA_CCTRL_ON			BIT(0)
>> +#define DMA_CCTRL_RST			BIT(1)
>> +#define DMA_CCTRL_CH_POLL_EN		BIT(2)
>> +#define DMA_CCTRL_CH_ABC		BIT(3) /* Adaptive Burst Chop */
>> +#define DMA_CDBA_MSB			GENMASK(7, 4)
>> +#define DMA_CCTRL_DIR_TX		BIT(8)
>> +#define DMA_CCTRL_CLASS			GENMASK(11, 9)
>> +#define DMA_CCTRL_CLASSH		GENMASK(19, 18)
>> +#define DMA_CCTRL_WR_NP_EN		BIT(21)
>> +#define DMA_CCTRL_PDEN			BIT(23)
>> +#define DMA_MAX_CLASS			(SZ_32 - 1)
>> +
>> +#define DMA_CDBA			0x0020
>> +#define DMA_CDLEN			0x0024
>> +#define DMA_CIS				0x0028
>> +#define DMA_CIE				0x002C
>> +#define DMA_CI_EOP			BIT(1)
>> +#define DMA_CI_DUR			BIT(2)
>> +#define DMA_CI_DESCPT			BIT(3)
>> +#define DMA_CI_CHOFF			BIT(4)
>> +#define DMA_CI_RDERR			BIT(5)
>> +#define DMA_CI_ALL							\
>> +	(DMA_CI_EOP | DMA_CI_DUR | DMA_CI_DESCPT | DMA_CI_CHOFF |
>> DMA_CI_RDERR)
>> +
>> +#define DMA_PS				0x0040
>> +#define DMA_PCTRL			0x0044
>> +#define DMA_PCTRL_RXBL16		BIT(0)
>> +#define DMA_PCTRL_TXBL16		BIT(1)
>> +#define DMA_PCTRL_RXBL			GENMASK(3, 2)
>> +#define DMA_PCTRL_RXBL_8		3
>> +#define DMA_PCTRL_TXBL			GENMASK(5, 4)
>> +#define DMA_PCTRL_TXBL_8		3
>> +#define DMA_PCTRL_PDEN			BIT(6)
>> +#define DMA_PCTRL_RXBL32		BIT(7)
>> +#define DMA_PCTRL_RXENDI		GENMASK(9, 8)
>> +#define DMA_PCTRL_TXENDI		GENMASK(11, 10)
>> +#define DMA_PCTRL_TXBL32		BIT(15)
>> +#define DMA_PCTRL_MEM_FLUSH		BIT(16)
>> +
>> +#define DMA_IRNEN1			0x00E8
>> +#define DMA_IRNCR1			0x00EC
>> +#define DMA_IRNEN			0x00F4
>> +#define DMA_IRNCR			0x00F8
>> +#define DMA_C_DP_TICK			0x100
>> +#define DMA_C_DP_TICK_TIKNARB		GENMASK(15, 0)
>> +#define DMA_C_DP_TICK_TIKARB		GENMASK(31, 16)
>> +
>> +#define DMA_C_HDRM			0x110
>> +/*
>> + * If header mode is set in DMA descriptor,
>> + *   If bit 30 is disabled, HDR_LEN must be configured according to
>> channel
>> + *     requirement.
>> + *   If bit 30 is enabled(checksum with heade mode), HDR_LEN has no
>> need to
>> + *     be configured. It will enable check sum for switch
>> + * If header mode is not set in DMA descriptor,
>> + *   This register setting doesn't matter
>> + */
>> +#define DMA_C_HDRM_HDR_SUM		BIT(30)
>> +
>> +#define DMA_C_BOFF			0x120
>> +#define DMA_C_BOFF_BOF_LEN		GENMASK(7, 0)
>> +#define DMA_C_BOFF_EN			BIT(31)
>> +
>> +#define DMA_ORRC			0x190
>> +#define DMA_ORRC_ORRCNT			GENMASK(8, 4)
>> +#define DMA_ORRC_EN			BIT(31)
>> +
>> +#define DMA_C_ENDIAN			0x200
>> +#define DMA_C_END_DATAENDI		GENMASK(1, 0)
>> +#define DMA_C_END_DE_EN			BIT(7)
>> +#define DMA_C_END_DESENDI		GENMASK(9, 8)
>> +#define DMA_C_END_DES_EN		BIT(16)
>> +
>> +/* DMA controller capability */
>> +#define DMA_ADDR_36BIT			BIT(0)
>> +#define DMA_DATA_128BIT			BIT(1)
>> +#define DMA_CHAN_FLOW_CTL		BIT(2)
>> +#define DMA_DESC_FTOD			BIT(3)
>> +#define DMA_DESC_IN_SRAM		BIT(4)
>> +#define DMA_EN_BYTE_EN			BIT(5)
>> +#define DMA_DBURST_WR			BIT(6)
>> +#define DMA_VLD_FETCH_ACK		BIT(7)
>> +#define DMA_DFT_DRB			BIT(8)
>> +
>> +#define DMA_ORRC_MAX_CNT		(SZ_32 - 1)
>> +#define DMA_DFT_POLL_CNT		SZ_4
>> +
>> +#define DMA_DFT_BURST_V22		2
>> +#define DMA_BURSTL_8DW			8
>> +#define DMA_BURSTL_16DW			16
>> +#define DMA_BURSTL_32DW			32
>> +#define DMA_DFT_BURST			DMA_BURSTL_16DW
>> +
>> +#define DMA_MAX_DESC_NUM		(SZ_8K - 1)
>> +#define DMA_CHAN_BOFF_MAX		(SZ_256 - 1)
>> +
>> +#define DMA_DFT_ENDIAN			DMA_ENDIAN_TYPE0
>> +
>> +#define DMA_DFT_DESC_TCNT		50
>> +#define DMA_HDR_LEN_MAX			(SZ_16K - 1)
>> +
>> +/* DMA flags */
>> +#define DMA_TX_CH			BIT(0)
>> +#define DMA_RX_CH			BIT(1)
>> +#define DEVICE_ALLOC_DESC		BIT(2)
>> +#define CHAN_IN_USE			BIT(3)
>> +#define DMA_HW_DESC			BIT(4)
>> +
>> +#define DMA_CHAN_RST			1
>> +#define DMA_MAX_SIZE			(BIT(16) - 1)
>> +#define MAX_LOWER_CHANS			32
>> +#define MASK_LOWER_CHANS		GENMASK(4, 0)
>> +#define DMA_OWN				1
>> +#define HIGH_4_BITS			GENMASK(3, 0)
>> +#define DMA_DFT_DESC_NUM		1
>> +
>> +enum ldma_chan_on_off {
>> +	DMA_CH_OFF = 0,
>> +	DMA_CH_ON = 1,
>> +};
>> +
>> +enum ldma_pkt_drop {
>> +	DMA_PKT_DROP_DIS = 0,
>> +	DMA_PKT_DROP_EN,
>> +};
> What is the use of this enum if only "DMA_PKT_DROP_DIS" is used in the code?
ok, i will drop the enum and just define it.
>
>> +
>> +enum ldma_endian {
>> +	DMA_ENDIAN_TYPE0 = 0,
>> +	DMA_ENDIAN_TYPE1,
>> +	DMA_ENDIAN_TYPE2,
>> +	DMA_ENDIAN_TYPE3,
>> +};
> And from this enum only "DMA_ENDIAN_TYPE0" is used (indirectly via a define)
same here also.
>
>> +
>> +enum {
>> +	DMA_TYPE_TX = 0,
>> +	DMA_TYPE_RX,
>> +	DMA_TYPE_MCPY,
>> +};
>> +
>> +enum ldma_port_name {
>> +	PORT0_SPI0 = 0,
>> +	PORT1_SPI1,
>> +	PORT2_SPI2,
>> +	PORT3_SPI3,
>> +	PORT4_HSNAND,
>> +	PORT5_PCM,
>> +};
> And this enum is not used at all!
Redundant. i will remove it.
>
>> +
>> +struct ldma_dev;
>> +struct ldma_port;
>> +
>> +struct ldma_chan {
>> +	struct virt_dma_chan	vchan;
>> +	struct ldma_port	*port; /* back pointer */
>> +	char			name[8]; /* Channel name */
>> +	int			nr; /* Channel id in hardware */
>> +	u32			flags; /* central way or channel based way */
>> +	enum ldma_chan_on_off	onoff;
>> +	dma_addr_t		desc_phys;
>> +	void			*desc_base; /* Virtual address */
>> +	u32			desc_cnt; /* Number of descriptors */
>> +	int			rst;
>> +	u32			hdrm_len;
>> +	bool			hdrm_csum;
>> +	u32			boff_len;
>> +	u32			data_endian;
>> +	u32			desc_endian;
>> +	bool			pden;
>> +	bool			desc_rx_np;
>> +	bool			data_endian_en;
>> +	bool			desc_endian_en;
>> +	bool			abc_en;
>> +	bool			desc_init;
>> +	struct dma_pool		*desc_pool; /* Descriptors pool */
>> +	u32			desc_num;
>> +	struct dw2_desc_sw	*ds;
>> +	struct work_struct	work;
>> +	struct dma_slave_config config;
>> +};
>> +
>> +struct ldma_port {
>> +	struct ldma_dev		*ldev; /* back pointer */
>> +	u32			portid;
>> +	u32			rxbl;
>> +	u32			txbl;
>> +	enum ldma_endian	rxendi;
>> +	enum ldma_endian	txendi;
>> +	enum ldma_pkt_drop	pkt_drop;
>> +};
>> +
>> +/* Instance specific data */
>> +struct ldma_inst_data {
>> +	struct dma_dev_ops	*ops;
>> +	const char	*name;
>> +	u32 type;
> Why are the element names not aligned, as in other structs?
thanks, i will update in the next patch.
>
>> +};
>> +
>> +struct ldma_dev {
>> +	struct device		*dev;
>> +	void __iomem		*base;
>> +	struct reset_control	*rst;
>> +	struct clk		*core_clk;
>> +	struct dma_device	dma_dev;
>> +	u32			ver;
>> +	int			irq;
>> +	struct ldma_port	*ports;
>> +	struct ldma_chan	*chans; /* channel list on this DMA or port */
>> +	spinlock_t		dev_lock; /* Controller register execlusive */
> typo: exclusive
Thank you very much. i will update it in the next patch.
>
>> +	u32			chan_nrs;
>> +	u32			port_nrs;
>> +	u32                     channels_mask;
> Why do you use space in this line?
Missed. i will fix it.
>
>> +	u32			flags;
>> +	u32			pollcnt;
>> +	u32			orrc; /* Outstanding read count */
>> +	const struct ldma_inst_data *inst;
>> +	struct workqueue_struct *wq;
>> +};
>> +
>> +struct dw2_desc {
>> +	struct {
>> +		u32 len		:16;
>> +		u32 res0	:7;
>> +		u32 bofs	:2;
>> +		u32 res1	:3;
>> +		u32 eop		:1;
>> +		u32 sop		:1;
>> +		u32 c		:1;
>> +		u32 own		:1;
> Typically, bitfields are written without spaces.
> And you are really sure that this driver will never be used for the older SoCs (MIPS based)?
> Because bitfields are difficult to handle when it comes to support both endianess variants.
This is driver is intended only for LGM and later versions. i won't 
support older SoCs.
>
>> +	} __packed field;
>> +	u32 addr;
>> +} __packed __aligned(8);
>> +
>> +struct dw2_desc_sw {
>> +	struct virt_dma_desc	vdesc;
>> +	struct ldma_chan	*chan;
>> +	dma_addr_t		desc_phys;
>> +	size_t			desc_cnt;
>> +	size_t			size;
>> +	struct dw2_desc		*desc_hw;
>> +};
>> +
>> +struct dma_dev_ops {
>> +	int (*device_alloc_chan_resources)(struct dma_chan *chan);
>> +	void (*device_free_chan_resources)(struct dma_chan *chan);
>> +	int (*device_config)(struct dma_chan *chan,
>> +			     struct dma_slave_config *config);
>> +	int (*device_pause)(struct dma_chan *chan);
>> +	int (*device_resume)(struct dma_chan *chan);
>> +	int (*device_terminate_all)(struct dma_chan *chan);
>> +	void (*device_synchronize)(struct dma_chan *chan);
>> +	enum dma_status (*device_tx_status)(struct dma_chan *chan,
>> +					    dma_cookie_t cookie,
>> +					    struct dma_tx_state *txstate);
>> +	struct dma_async_tx_descriptor *(*device_prep_slave_sg)
>> +		(struct dma_chan *chan, struct scatterlist *sgl,
>> +		unsigned int sg_len, enum dma_transfer_direction direction,
>> +		unsigned long flags, void *context);
>> +	void (*device_issue_pending)(struct dma_chan *chan);
>> +};
>> +
>> +static inline void
>> +ldma_update_bits(struct ldma_dev *d, u32 mask, u32 val, u32 ofs)
>> +{
>> +	u32 old_val, new_val;
>> +
>> +	old_val = readl(d->base +  ofs);
>> +	new_val = (old_val & ~mask) | (val & mask);
>> +
>> +	if (new_val != old_val)
>> +		writel(new_val, d->base + ofs);
>> +}
>> +
>> +static inline struct ldma_chan *to_ldma_chan(struct dma_chan *chan)
>> +{
>> +	return container_of(chan, struct ldma_chan, vchan.chan);
>> +}
>> +
>> +static inline struct ldma_dev *to_ldma_dev(struct dma_device
>> *dma_dev)
>> +{
>> +	return container_of(dma_dev, struct ldma_dev, dma_dev);
>> +}
>> +
>> +static inline struct dw2_desc_sw *to_lgm_dma_desc(struct
>> virt_dma_desc *vdesc)
>> +{
>> +	return container_of(vdesc, struct dw2_desc_sw, vdesc);
>> +}
>> +
>> +static inline bool ldma_chan_tx(struct ldma_chan *c)
>> +{
>> +	return !!(c->flags & DMA_TX_CH);
>> +}
>> +
>> +static inline bool ldma_chan_is_hw_desc(struct ldma_chan *c)
>> +{
>> +	return !!(c->flags & DMA_HW_DESC);
>> +}
>> +
>> +static void ldma_dev_reset(struct ldma_dev *d)
>> +
>> +{
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, DMA_CTRL_RST, DMA_CTRL_RST, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_pkt_arb_cfg(struct ldma_dev *d, bool enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask = DMA_CTRL_PKTARB;
>> +	u32 val = enable ? DMA_CTRL_PKTARB : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_sram_desc_cfg(struct ldma_dev *d, bool enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask = DMA_CTRL_DSRAM_PATH;
>> +	u32 val = enable ? DMA_CTRL_DSRAM_PATH : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_chan_flow_ctl_cfg(struct ldma_dev *d, bool
>> enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask, val;
>> +
>> +	if (d->inst->type != DMA_TYPE_TX)
>> +		return;
>> +
>> +	mask = DMA_CTRL_CH_FL;
>> +	val = enable ? DMA_CTRL_CH_FL : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_global_polling_enable(struct ldma_dev *d)
>> +{
>> +	unsigned long flags;
>> +	u32 mask = DMA_CPOLL_EN | DMA_CPOLL_CNT;
>> +	u32 val = DMA_CPOLL_EN;
>> +
>> +	val |= FIELD_PREP(DMA_CPOLL_CNT, d->pollcnt);
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CPOLL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_desc_fetch_on_demand_cfg(struct ldma_dev *d,
>> bool enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask, val;
>> +
>> +	if (d->inst->type == DMA_TYPE_MCPY)
>> +		return;
>> +
>> +	mask = DMA_CTRL_DS_FOD;
>> +	val = enable ? DMA_CTRL_DS_FOD : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_byte_enable_cfg(struct ldma_dev *d, bool enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask = DMA_CTRL_ENBE;
>> +	u32 val = enable ? DMA_CTRL_ENBE : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +/*
>> + * orr_cnt >= 16, it will be 16
>> + * 4 <= orr_cnt < 16, it ill be orr_cnt
>> + * orr_cnt < 4, it will be 3. Minimum 3 orr supported
>> + */
>> +static void ldma_dev_orrc_cfg(struct ldma_dev *d)
>> +{
>> +	unsigned long flags;
>> +	u32 val = 0;
>> +	u32 mask;
>> +
>> +	if (d->inst->type == DMA_TYPE_RX)
>> +		return;
>> +
>> +	mask = DMA_ORRC_EN | DMA_ORRC_ORRCNT;
>> +	if (d->orrc > 0 && d->orrc <= DMA_ORRC_MAX_CNT)
>> +		val = DMA_ORRC_EN | FIELD_PREP(DMA_ORRC_ORRCNT, d->orrc);
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_ORRC);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_df_tout_cfg(struct ldma_dev *d, bool enable, int
>> tcnt)
>> +{
>> +	u32 mask = DMA_CTRL_DESC_TMOUT_CNT_V31;
>> +	unsigned long flags;
>> +	u32 val;
>> +
>> +	if (enable)
>> +		val = DMA_CTRL_DESC_TMOUT_EN_V31 |
>> FIELD_PREP(DMA_CTRL_DESC_TMOUT_CNT_V31, tcnt);
>> +	else
>> +		val = 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_dburst_wr_cfg(struct ldma_dev *d, bool enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask, val;
>> +
>> +	if (d->inst->type != DMA_TYPE_RX && d->inst->type !=
>> DMA_TYPE_MCPY)
>> +		return;
>> +
>> +	mask = DMA_CTRL_DBURST_WR;
>> +	val = enable ? DMA_CTRL_DBURST_WR : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_vld_fetch_ack_cfg(struct ldma_dev *d, bool
>> enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask, val;
>> +
>> +	if (d->inst->type != DMA_TYPE_TX)
>> +		return;
>> +
>> +	mask = DMA_CTRL_VLD_DF_ACK;
>> +	val = enable ? DMA_CTRL_VLD_DF_ACK : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_dev_drb_cfg(struct ldma_dev *d, int enable)
>> +{
>> +	unsigned long flags;
>> +	u32 mask = DMA_CTRL_DRB;
>> +	u32 val = enable ? DMA_CTRL_DRB : 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, mask, val, DMA_CTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static int ldma_dev_cfg(struct ldma_dev *d)
>> +{
>> +	bool enable;
>> +
>> +	ldma_dev_pkt_arb_cfg(d, true);
>> +	ldma_dev_global_polling_enable(d);
>> +
>> +	enable = !!(d->flags & DMA_DFT_DRB);
>> +	ldma_dev_drb_cfg(d, enable);
>> +
>> +	enable = !!(d->flags & DMA_EN_BYTE_EN);
>> +	ldma_dev_byte_enable_cfg(d, enable);
>> +
>> +	enable = !!(d->flags & DMA_CHAN_FLOW_CTL);
>> +	ldma_dev_chan_flow_ctl_cfg(d, enable);
>> +
>> +	enable = !!(d->flags & DMA_DESC_FTOD);
>> +	ldma_dev_desc_fetch_on_demand_cfg(d, enable);
>> +
>> +	enable = !!(d->flags & DMA_DESC_IN_SRAM);
>> +	ldma_dev_sram_desc_cfg(d, enable);
>> +
>> +	enable = !!(d->flags & DMA_DBURST_WR);
>> +	ldma_dev_dburst_wr_cfg(d, enable);
>> +
>> +	enable = !!(d->flags & DMA_VLD_FETCH_ACK);
>> +	ldma_dev_vld_fetch_ack_cfg(d, enable);
>> +
>> +	if (d->ver > DMA_VER22) {
>> +		ldma_dev_orrc_cfg(d);
>> +		ldma_dev_df_tout_cfg(d, true, DMA_DFT_DESC_TCNT);
>> +	}
>> +
>> +	dev_dbg(d->dev, "%s Controller 0x%08x configuration done\n",
>> +		d->inst->name, readl(d->base + DMA_CTRL));
>> +
>> +	return 0;
>> +}
>> +
>> +static int ldma_chan_cctrl_cfg(struct ldma_chan *c, u32 val)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 class_low, class_high;
>> +	unsigned long flags;
>> +	u32 reg;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	reg = readl(d->base + DMA_CCTRL);
>> +	/* Read from hardware */
>> +	if (reg & DMA_CCTRL_DIR_TX)
>> +		c->flags |= DMA_TX_CH;
>> +	else
>> +		c->flags |= DMA_RX_CH;
>> +
>> +	/* Keep the class value unchanged */
>> +	class_low = FIELD_GET(DMA_CCTRL_CLASS, reg);
>> +	class_high = FIELD_GET(DMA_CCTRL_CLASSH, reg);
>> +	val &= ~DMA_CCTRL_CLASS;
>> +	val |= FIELD_PREP(DMA_CCTRL_CLASS, class_low);
>> +	val &= ~DMA_CCTRL_CLASSH;
>> +	val |= FIELD_PREP(DMA_CCTRL_CLASSH, class_high);
>> +	writel(val, d->base + DMA_CCTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static void ldma_chan_irq_init(struct ldma_chan *c)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +	u32 enofs, crofs;
>> +	u32 cn_bit;
>> +
>> +	if (c->nr < MAX_LOWER_CHANS) {
>> +		enofs = DMA_IRNEN;
>> +		crofs = DMA_IRNCR;
>> +	} else {
>> +		enofs = DMA_IRNEN1;
>> +		crofs = DMA_IRNCR1;
>> +	}
>> +
>> +	cn_bit = BIT(c->nr & MASK_LOWER_CHANS);
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +
>> +	/* Clear all interrupts and disabled it */
>> +	writel(0, d->base + DMA_CIE);
>> +	writel(DMA_CI_ALL, d->base + DMA_CIS);
>> +
>> +	ldma_update_bits(d, cn_bit, 0, enofs);
>> +	writel(cn_bit, d->base + crofs);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void ldma_chan_set_class(struct ldma_chan *c, u32 val)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 class_val;
>> +
>> +	if (d->inst->type == DMA_TYPE_MCPY || val > DMA_MAX_CLASS)
>> +		return;
>> +
>> +	/* 3 bits low */
>> +	class_val = FIELD_PREP(DMA_CCTRL_CLASS, val & 0x7);
>> +	/* 2 bits high */
>> +	class_val |= FIELD_PREP(DMA_CCTRL_CLASSH, (val >> 3) & 0x3);
>> +
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH,
>> class_val,
>> +			 DMA_CCTRL);
>> +}
>> +
>> +static int ldma_chan_on(struct ldma_chan *c)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +
>> +	/* If descriptors not configured, not allow to turn on channel */
>> +	if (WARN_ON(!c->desc_init))
>> +		return -EINVAL;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, DMA_CCTRL_ON, DMA_CCTRL_ON, DMA_CCTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +
>> +	c->onoff = DMA_CH_ON;
>> +
>> +	return 0;
>> +}
>> +
>> +static int ldma_chan_off(struct ldma_chan *c)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +	u32 val;
>> +	int ret;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, DMA_CCTRL_ON, 0, DMA_CCTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +
>> +	ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
>> +					!(val & DMA_CCTRL_ON), 0, 10000);
>> +	if (ret)
>> +		return ret;
>> +
>> +	c->onoff = DMA_CH_OFF;
>> +
>> +	return 0;
>> +}
>> +
>> +static void ldma_chan_desc_hw_cfg(struct ldma_chan *c, dma_addr_t
>> desc_base,
>> +				  int desc_num)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	writel(lower_32_bits(desc_base), d->base + DMA_CDBA);
>> +
>> +	/* Higher 4 bits of 36 bit addressing */
>> +	if (IS_ENABLED(CONFIG_64BIT)) {
>> +		u32 hi = upper_32_bits(desc_base) & HIGH_4_BITS;
>> +
>> +		ldma_update_bits(d, DMA_CDBA_MSB,
>> +				 FIELD_PREP(DMA_CDBA_MSB, hi), DMA_CCTRL);
>> +	}
>> +	writel(desc_num, d->base + DMA_CDLEN);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +
>> +	c->desc_init = true;
>> +}
>> +
>> +/*
>> + * Descriptor base address and data pointer must be physical address
>> when
>> + * writen to the register.
>> + * This API will be used by CBM which configure hardware descriptor.
>> + */
>> +static int ldma_chan_desc_cfg(struct ldma_chan *c, dma_addr_t
>> desc_base,
>> +			      int desc_num)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +
>> +	if (!desc_num) {
>> +		dev_err(d->dev, "Channel %d must allocate descriptor
>> first\n",
>> +			c->nr);
>> +		return -EINVAL;
>> +	}
>> +
>> +	if (desc_num > DMA_MAX_DESC_NUM) {
>> +		dev_err(d->dev, "Channel %d descriptor number out of range
>> %d\n",
>> +			c->nr, desc_num);
>> +		return -EINVAL;
>> +	}
>> +
>> +	ldma_chan_desc_hw_cfg(c, desc_base, desc_num);
>> +
>> +	c->flags |= DMA_HW_DESC;
>> +	c->desc_cnt = desc_num;
>> +	c->desc_phys = desc_base;
>> +
>> +	return 0;
>> +}
>> +
>> +int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
>> desc_base,
>> +			    int desc_num)
>> +{
>> +	return ldma_chan_desc_cfg(to_ldma_chan(chan), desc_base,
>> desc_num);
>> +}
>> +EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg);
>> +
>> +static int ldma_chan_reset(struct ldma_chan *c)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +	u32 val;
>> +	int ret;
>> +
>> +	ret = ldma_chan_off(c);
>> +	if (ret)
>> +		return ret;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, DMA_CCTRL_RST, DMA_CCTRL_RST, DMA_CCTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +
>> +	ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
>> +					!(val & DMA_CCTRL_RST), 0, 10000);
>> +	if (ret)
>> +		return ret;
>> +
>> +	c->rst = 1;
>> +	c->desc_init = false;
>> +
>> +	return 0;
>> +}
>> +
>> +static void ldma_chan_byte_offset_cfg(struct ldma_chan *c, u32
>> boff_len)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 mask = DMA_C_BOFF_EN | DMA_C_BOFF_BOF_LEN;
>> +	u32 val;
>> +
>> +	if (boff_len > 0 && boff_len <= DMA_CHAN_BOFF_MAX)
>> +		val = FIELD_PREP(DMA_C_BOFF_BOF_LEN, boff_len) |
>> DMA_C_BOFF_EN;
>> +	else
>> +		val = 0;
>> +
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, mask, val, DMA_C_BOFF);
>> +}
>> +
>> +static void ldma_chan_data_endian_cfg(struct ldma_chan *c, bool
>> enable,
>> +				      u32 endian_type)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 mask = DMA_C_END_DE_EN | DMA_C_END_DATAENDI;
>> +	u32 val;
>> +
>> +	if (enable)
>> +		val = DMA_C_END_DE_EN | FIELD_PREP(DMA_C_END_DATAENDI,
>> endian_type);
>> +	else
>> +		val = 0;
>> +
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
>> +}
>> +
>> +static void ldma_chan_desc_endian_cfg(struct ldma_chan *c, bool
>> enable,
>> +				      u32 endian_type)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 mask = DMA_C_END_DES_EN | DMA_C_END_DESENDI;
>> +	u32 val;
>> +
>> +	if (enable)
>> +		val = DMA_C_END_DES_EN | FIELD_PREP(DMA_C_END_DESENDI,
>> endian_type);
>> +	else
>> +		val = 0;
>> +
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
>> +}
>> +
>> +static void ldma_chan_hdr_mode_cfg(struct ldma_chan *c, u32 hdr_len,
>> bool csum)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 mask, val;
>> +
>> +	/* NB, csum disabled, hdr length must be provided */
>> +	if (!csum && (!hdr_len || hdr_len > DMA_HDR_LEN_MAX))
>> +		return;
>> +
>> +	mask = DMA_C_HDRM_HDR_SUM;
>> +	val = DMA_C_HDRM_HDR_SUM;
>> +
>> +	if (!csum && hdr_len)
>> +		val = hdr_len;
>> +
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, mask, val, DMA_C_HDRM);
>> +}
>> +
>> +static void ldma_chan_rxwr_np_cfg(struct ldma_chan *c, bool enable)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 mask, val;
>> +
>> +	/* Only valid for RX channel */
>> +	if (ldma_chan_tx(c))
>> +		return;
>> +
>> +	mask = DMA_CCTRL_WR_NP_EN;
>> +	val = enable ? DMA_CCTRL_WR_NP_EN : 0;
>> +
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, mask, val, DMA_CCTRL);
>> +}
>> +
>> +static void ldma_chan_abc_cfg(struct ldma_chan *c, bool enable)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 mask, val;
>> +
>> +	if (d->ver < DMA_VER32 || ldma_chan_tx(c))
>> +		return;
>> +
>> +	mask = DMA_CCTRL_CH_ABC;
>> +	val = enable ? DMA_CCTRL_CH_ABC : 0;
>> +
>> +	ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
>> +	ldma_update_bits(d, mask, val, DMA_CCTRL);
>> +}
>> +
>> +static int ldma_port_cfg(struct ldma_port *p)
>> +{
>> +	unsigned long flags;
>> +	struct ldma_dev *d;
>> +	u32 reg;
>> +
>> +	d = p->ldev;
>> +	reg = FIELD_PREP(DMA_PCTRL_TXENDI, p->txendi);
>> +	reg |= FIELD_PREP(DMA_PCTRL_RXENDI, p->rxendi);
>> +
>> +	if (d->ver == DMA_VER22) {
>> +		reg |= FIELD_PREP(DMA_PCTRL_TXBL, p->txbl);
>> +		reg |= FIELD_PREP(DMA_PCTRL_RXBL, p->rxbl);
>> +	} else {
>> +		reg |= FIELD_PREP(DMA_PCTRL_PDEN, p->pkt_drop);
>> +
>> +		if (p->txbl == DMA_BURSTL_32DW)
>> +			reg |= DMA_PCTRL_TXBL32;
>> +		else if (p->txbl == DMA_BURSTL_16DW)
>> +			reg |= DMA_PCTRL_TXBL16;
>> +		else
>> +			reg |= FIELD_PREP(DMA_PCTRL_TXBL, DMA_PCTRL_TXBL_8);
>> +
>> +		if (p->rxbl == DMA_BURSTL_32DW)
>> +			reg |= DMA_PCTRL_RXBL32;
>> +		else if (p->rxbl == DMA_BURSTL_16DW)
>> +			reg |= DMA_PCTRL_RXBL16;
>> +		else
>> +			reg |= FIELD_PREP(DMA_PCTRL_RXBL, DMA_PCTRL_RXBL_8);
>> +	}
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	writel(p->portid, d->base + DMA_PS);
>> +	writel(reg, d->base + DMA_PCTRL);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +
>> +	reg = readl(d->base + DMA_PCTRL); /* read back */
>> +	dev_dbg(d->dev, "Port Control 0x%08x configuration done\n", reg);
>> +
>> +	return 0;
>> +}
>> +
>> +static int ldma_chan_cfg(struct ldma_chan *c)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +	u32 reg;
>> +
>> +	reg = c->pden ? DMA_CCTRL_PDEN : 0;
>> +	reg |= c->onoff ? DMA_CCTRL_ON : 0;
>> +	reg |= c->rst ? DMA_CCTRL_RST : 0;
>> +
>> +	ldma_chan_cctrl_cfg(c, reg);
>> +	ldma_chan_irq_init(c);
>> +
>> +	if (d->ver <= DMA_VER22)
>> +		return 0;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	ldma_chan_set_class(c, c->nr);
>> +	ldma_chan_byte_offset_cfg(c, c->boff_len);
>> +	ldma_chan_data_endian_cfg(c, c->data_endian_en, c->data_endian);
>> +	ldma_chan_desc_endian_cfg(c, c->desc_endian_en, c->desc_endian);
>> +	ldma_chan_hdr_mode_cfg(c, c->hdrm_len, c->hdrm_csum);
>> +	ldma_chan_rxwr_np_cfg(c, c->desc_rx_np);
>> +	ldma_chan_abc_cfg(c, c->abc_en);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +
>> +	if (ldma_chan_is_hw_desc(c))
>> +		ldma_chan_desc_hw_cfg(c, c->desc_phys, c->desc_cnt);
>> +
>> +	return 0;
>> +}
>> +
>> +static void ldma_dev_init(struct ldma_dev *d)
>> +{
>> +	unsigned long ch_mask = (unsigned long)d->channels_mask;
>> +	struct ldma_port *p;
>> +	struct ldma_chan *c;
>> +	int i;
>> +	u32 j;
>> +
>> +	spin_lock_init(&d->dev_lock);
>> +	ldma_dev_reset(d);
>> +	ldma_dev_cfg(d);
>> +
>> +	/* DMA port initialization */
>> +	for (i = 0; i < d->port_nrs; i++) {
>> +		p = &d->ports[i];
>> +		ldma_port_cfg(p);
>> +	}
>> +
>> +	/* DMA channel initialization */
>> +	for_each_set_bit(j, &ch_mask, d->chan_nrs) {
>> +		c = &d->chans[j];
>> +		ldma_chan_cfg(c);
>> +	}
>> +}
>> +
>> +static int ldma_cfg_init(struct ldma_dev *d)
>> +{
>> +	struct fwnode_handle *fwnode = dev_fwnode(d->dev);
>> +	struct ldma_port *p;
>> +	u32 val;
>> +	int i;
>> +
>> +	if (fwnode_property_read_bool(fwnode, "intel,dma-chan-fc"))
>> +		d->flags |= DMA_CHAN_FLOW_CTL;
>> +
>> +	if (fwnode_property_read_bool(fwnode, "intel,dma-desc-fod"))
>> +		d->flags |= DMA_DESC_FTOD;
>> +
>> +	if (fwnode_property_read_bool(fwnode, "intel,dma-desc-in-sram"))
>> +		d->flags |= DMA_DESC_IN_SRAM;
>> +
>> +	if (fwnode_property_read_bool(fwnode, "intel,dma-byte-en"))
>> +		d->flags |= DMA_EN_BYTE_EN;
>> +
>> +	if (fwnode_property_read_bool(fwnode, "intel,dma-dfetch-ack"))
>> +		d->flags |= DMA_VLD_FETCH_ACK;
>> +
>> +	if (fwnode_property_read_bool(fwnode, "intel,dma-dburst-wr"))
>> +		d->flags |= DMA_DBURST_WR;
>> +
>> +	if (fwnode_property_read_bool(fwnode, "intel,dma-drb"))
>> +		d->flags |= DMA_DFT_DRB;
>> +
>> +	if (fwnode_property_read_u32(fwnode, "intel,dma-poll-cnt",
>> +				     &d->pollcnt))
>> +		d->pollcnt = DMA_DFT_POLL_CNT;
>> +
>> +	if (!fwnode_property_read_u32(fwnode, "intel,dma-orrc", &val)) {
>> +		if (val > DMA_ORRC_MAX_CNT)
>> +			return -EINVAL;
>> +		d->orrc = val;
>> +	}
>> +
>> +	if (d->ver > DMA_VER22) {
>> +		if (!d->port_nrs)
>> +			return -EINVAL;
>> +
>> +		for (i = 0; i < d->port_nrs; i++) {
>> +			p = &d->ports[i];
>> +			p->rxendi = DMA_DFT_ENDIAN;
>> +			p->txendi = DMA_DFT_ENDIAN;
>> +			p->rxbl = DMA_DFT_BURST;
>> +			p->txbl = DMA_DFT_BURST;
>> +			p->pkt_drop = DMA_PKT_DROP_DIS;
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void dma_free_desc_resource(struct virt_dma_desc *vdesc)
>> +{
>> +	struct dw2_desc_sw *ds = to_lgm_dma_desc(vdesc);
>> +	struct ldma_chan *c = ds->chan;
>> +
>> +	dma_pool_free(c->desc_pool, ds->desc_hw, ds->desc_phys);
>> +	kfree(ds);
>> +}
>> +
>> +static struct dw2_desc_sw *
>> +dma_alloc_desc_resource(int num, struct ldma_chan *c)
>> +{
>> +	struct device *dev = c->vchan.chan.device->dev;
>> +	struct dw2_desc_sw *ds;
>> +
>> +	if (num > c->desc_num) {
>> +		dev_err(dev, "sg num %d exceed max %d\n", num, c-
>>> desc_num);
>> +		return NULL;
>> +	}
>> +
>> +	ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
>> +	if (!ds)
>> +		return NULL;
>> +
>> +	ds->chan = c;
>> +	ds->desc_hw = dma_pool_zalloc(c->desc_pool, GFP_ATOMIC,
>> +				      &ds->desc_phys);
>> +	if (!ds->desc_hw) {
>> +		dev_dbg(dev, "out of memory for link descriptor\n");
>> +		kfree(ds);
>> +		return NULL;
>> +	}
>> +	ds->desc_cnt = num;
>> +
>> +	return ds;
>> +}
>> +
>> +static void ldma_chan_irq_en(struct ldma_chan *c)
>> +{
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&d->dev_lock, flags);
>> +	writel(c->nr, d->base + DMA_CS);
>> +	writel(DMA_CI_EOP, d->base + DMA_CIE);
>> +	writel(BIT(c->nr), d->base + DMA_IRNEN);
>> +	spin_unlock_irqrestore(&d->dev_lock, flags);
>> +}
>> +
>> +static void dma_issue_pending(struct dma_chan *chan)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	unsigned long flags;
>> +
>> +	if (d->ver == DMA_VER22) {
>> +		spin_lock_irqsave(&c->vchan.lock, flags);
>> +		if (vchan_issue_pending(&c->vchan)) {
>> +			struct virt_dma_desc *vdesc;
>> +
>> +			/* Get the next descriptor */
>> +			vdesc = vchan_next_desc(&c->vchan);
>> +			if (!vdesc) {
>> +				c->ds = NULL;
>> +				spin_unlock_irqrestore(&c->vchan.lock, flags);
>> +				return;
>> +			}
>> +			list_del(&vdesc->node);
>> +			c->ds = to_lgm_dma_desc(vdesc);
>> +			ldma_chan_desc_hw_cfg(c, c->ds->desc_phys, c->ds-
>>> desc_cnt);
>> +			ldma_chan_irq_en(c);
>> +		}
>> +		spin_unlock_irqrestore(&c->vchan.lock, flags);
>> +	}
>> +	ldma_chan_on(c);
>> +}
>> +
>> +static void dma_synchronize(struct dma_chan *chan)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +
>> +	/*
>> +	 * clear any pending work if any. In that
>> +	 * case the resource needs to be free here.
>> +	 */
>> +	cancel_work_sync(&c->work);
>> +	vchan_synchronize(&c->vchan);
>> +	if (c->ds)
>> +		dma_free_desc_resource(&c->ds->vdesc);
>> +}
>> +
>> +static int dma_terminate_all(struct dma_chan *chan)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +	unsigned long flags;
>> +	LIST_HEAD(head);
>> +
>> +	spin_lock_irqsave(&c->vchan.lock, flags);
>> +	vchan_get_all_descriptors(&c->vchan, &head);
>> +	spin_unlock_irqrestore(&c->vchan.lock, flags);
>> +	vchan_dma_desc_free_list(&c->vchan, &head);
>> +
>> +	return ldma_chan_reset(c);
>> +}
>> +
>> +static int dma_resume_chan(struct dma_chan *chan)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +
>> +	ldma_chan_on(c);
>> +
>> +	return 0;
>> +}
>> +
>> +static int dma_pause_chan(struct dma_chan *chan)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +
>> +	return ldma_chan_off(c);
>> +}
>> +
>> +static enum dma_status
>> +dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
>> +	      struct dma_tx_state *txstate)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	enum dma_status status = DMA_COMPLETE;
>> +
>> +	if (d->ver == DMA_VER22)
>> +		status = dma_cookie_status(chan, cookie, txstate);
>> +
>> +	return status;
>> +}
>> +
>> +static void dma_chan_irq(int irq, void *data)
>> +{
>> +	struct ldma_chan *c = data;
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	u32 stat;
>> +
>> +	/* Disable channel interrupts  */
>> +	writel(c->nr, d->base + DMA_CS);
>> +	stat = readl(d->base + DMA_CIS);
>> +	if (!stat)
>> +		return;
>> +
>> +	writel(readl(d->base + DMA_CIE) & ~DMA_CI_ALL, d->base +
>> DMA_CIE);
>> +	writel(stat, d->base + DMA_CIS);
>> +	queue_work(d->wq, &c->work);
>> +}
>> +
>> +static irqreturn_t dma_interrupt(int irq, void *dev_id)
>> +{
>> +	struct ldma_dev *d = dev_id;
>> +	struct ldma_chan *c;
>> +	unsigned long irncr;
>> +	u32 cid;
>> +
>> +	irncr = readl(d->base + DMA_IRNCR);
>> +	if (!irncr) {
>> +		dev_err(d->dev, "dummy interrupt\n");
>> +		return IRQ_NONE;
>> +	}
>> +
>> +	for_each_set_bit(cid, &irncr, d->chan_nrs) {
>> +		/* Mask */
>> +		writel(readl(d->base + DMA_IRNEN) & ~BIT(cid), d->base +
>> DMA_IRNEN);
>> +		/* Ack */
>> +		writel(readl(d->base + DMA_IRNCR) | BIT(cid), d->base +
>> DMA_IRNCR);
>> +
>> +		c = &d->chans[cid];
>> +		dma_chan_irq(irq, c);
>> +	}
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static void prep_slave_burst_len(struct ldma_chan *c)
>> +{
>> +	struct ldma_port *p = c->port;
>> +	struct dma_slave_config *cfg = &c->config;
>> +
>> +	if (cfg->dst_maxburst)
>> +		cfg->src_maxburst = cfg->dst_maxburst;
>> +
>> +	/* TX and RX has the same burst length */
>> +	p->txbl = ilog2(cfg->src_maxburst);
>> +	p->rxbl = p->txbl;
>> +}
>> +
>> +static struct dma_async_tx_descriptor *
>> +dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
>> +		  unsigned int sglen, enum dma_transfer_direction dir,
>> +		  unsigned long flags, void *context)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +	size_t len, avail, total = 0;
>> +	struct dw2_desc *hw_ds;
>> +	struct dw2_desc_sw *ds;
>> +	struct scatterlist *sg;
>> +	int num = sglen, i;
>> +	dma_addr_t addr;
>> +
>> +	if (!sgl)
>> +		return NULL;
>> +
>> +	for_each_sg(sgl, sg, sglen, i) {
>> +		avail = sg_dma_len(sg);
>> +		if (avail > DMA_MAX_SIZE)
>> +			num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
>> +	}
>> +
>> +	ds = dma_alloc_desc_resource(num, c);
>> +	if (!ds)
>> +		return NULL;
>> +
>> +	c->ds = ds;
>> +
>> +	num = 0;
>> +	/* sop and eop has to be handled nicely */
>> +	for_each_sg(sgl, sg, sglen, i) {
>> +		addr = sg_dma_address(sg);
>> +		avail = sg_dma_len(sg);
>> +		total += avail;
>> +
>> +		do {
>> +			len = min_t(size_t, avail, DMA_MAX_SIZE);
>> +
>> +			hw_ds = &ds->desc_hw[num];
>> +			switch (sglen) {
>> +			case 1:
>> +				hw_ds->field.sop = 1;
>> +				hw_ds->field.eop = 1;
>> +				break;
>> +			default:
>> +				if (num == 0) {
>> +					hw_ds->field.sop = 1;
>> +					hw_ds->field.eop = 0;
>> +				} else if (num == (sglen - 1)) {
>> +					hw_ds->field.sop = 0;
>> +					hw_ds->field.eop = 1;
>> +				} else {
>> +					hw_ds->field.sop = 0;
>> +					hw_ds->field.eop = 0;
>> +				}
>> +				break;
>> +			}
>> +
>> +			/* Only 32 bit address supported */
>> +			hw_ds->addr = (u32)addr;
>> +			hw_ds->field.len = len;
>> +			hw_ds->field.c = 0;
>> +			hw_ds->field.bofs = addr & 0x3;
>> +			/* Ensure data ready before ownership change */
>> +			wmb();
>> +			hw_ds->field.own = DMA_OWN;
>> +			/* Ensure ownership changed before moving forward */
>> +			wmb();
>> +			num++;
>> +			addr += len;
>> +			avail -= len;
>> +		} while (avail);
>> +	}
>> +
>> +	ds->size = total;
>> +	prep_slave_burst_len(c);
>> +
>> +	return vchan_tx_prep(&c->vchan, &ds->vdesc, DMA_CTRL_ACK);
>> +}
>> +
>> +static int
>> +dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +
>> +	memcpy(&c->config, cfg, sizeof(c->config));
>> +
>> +	return 0;
>> +}
>> +
>> +static int dma_alloc_chan_resources(struct dma_chan *chan)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +	struct device *dev = c->vchan.chan.device->dev;
>> +	size_t	desc_sz;
>> +
>> +	if (d->ver > DMA_VER22) {
>> +		c->flags |= CHAN_IN_USE;
>> +		return 0;
>> +	}
>> +
>> +	if (c->desc_pool)
>> +		return c->desc_num;
>> +
>> +	desc_sz = c->desc_num * sizeof(struct dw2_desc);
>> +	c->desc_pool = dma_pool_create(c->name, dev, desc_sz,
>> +				       __alignof__(struct dw2_desc), 0);
>> +
>> +	if (!c->desc_pool) {
>> +		dev_err(dev, "unable to allocate descriptor pool\n");
>> +		return -ENOMEM;
>> +	}
>> +
>> +	return c->desc_num;
>> +}
>> +
>> +static void dma_free_chan_resources(struct dma_chan *chan)
>> +{
>> +	struct ldma_chan *c = to_ldma_chan(chan);
>> +	struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
>> +
>> +	if (d->ver == DMA_VER22) {
>> +		dma_pool_destroy(c->desc_pool);
>> +		c->desc_pool = NULL;
>> +		vchan_free_chan_resources(to_virt_chan(chan));
>> +		ldma_chan_reset(c);
>> +	} else {
>> +		c->flags &= ~CHAN_IN_USE;
>> +	}
>> +}
>> +
>> +static void dma_work(struct work_struct *work)
>> +{
>> +	struct ldma_chan *c = container_of(work, struct ldma_chan, work);
>> +	struct dma_async_tx_descriptor *tx = &c->ds->vdesc.tx;
>> +	struct virt_dma_chan *vc = &c->vchan;
>> +	struct dmaengine_desc_callback cb;
>> +	struct virt_dma_desc *vd, *_vd;
>> +	unsigned long flags;
>> +	LIST_HEAD(head);
>> +
>> +	spin_lock_irqsave(&c->vchan.lock, flags);
>> +	list_splice_tail_init(&vc->desc_completed, &head);
>> +	spin_unlock_irqrestore(&c->vchan.lock, flags);
>> +	dmaengine_desc_get_callback(tx, &cb);
>> +	dma_cookie_complete(tx);
>> +	dmaengine_desc_callback_invoke(&cb, NULL);
>> +
>> +	list_for_each_entry_safe(vd, _vd, &head, node) {
>> +		dmaengine_desc_get_callback(tx, &cb);
>> +		dma_cookie_complete(tx);
>> +		list_del(&vd->node);
>> +		dmaengine_desc_callback_invoke(&cb, NULL);
>> +
>> +		vchan_vdesc_fini(vd);
>> +	}
>> +	c->ds = NULL;
>> +}
>> +
>> +static void
>> +update_burst_len_v22(struct ldma_chan *c, struct ldma_port *p, u32
>> burst)
>> +{
>> +	if (ldma_chan_tx(c))
>> +		p->txbl = ilog2(burst);
>> +	else
>> +		p->rxbl = ilog2(burst);
>> +}
>> +
>> +static void
>> +update_burst_len_v3X(struct ldma_chan *c, struct ldma_port *p, u32
>> burst)
>> +{
>> +	if (ldma_chan_tx(c))
>> +		p->txbl = burst;
>> +	else
>> +		p->rxbl = burst;
>> +}
>> +
>> +static int
>> +update_client_configs(struct of_dma *ofdma, struct of_phandle_args
>> *spec)
>> +{
>> +	struct ldma_dev *d = ofdma->of_dma_data;
>> +	u32 chan_id =  spec->args[0];
>> +	u32 port_id =  spec->args[1];
>> +	u32 burst = spec->args[2];
>> +	struct ldma_port *p;
>> +	struct ldma_chan *c;
>> +
>> +	if (chan_id >= d->chan_nrs || port_id >= d->port_nrs)
>> +		return 0;
>> +
>> +	p = &d->ports[port_id];
>> +	c = &d->chans[chan_id];
>> +	c->port = p;
>> +
>> +	if (d->ver == DMA_VER22)
>> +		update_burst_len_v22(c, p, burst);
>> +	else
>> +		update_burst_len_v3X(c, p, burst);
>> +
>> +	ldma_port_cfg(p);
>> +
>> +	return 1;
>> +}
>> +
>> +static struct dma_chan *ldma_xlate(struct of_phandle_args *spec,
>> +				   struct of_dma *ofdma)
>> +{
>> +	struct ldma_dev *d = ofdma->of_dma_data;
>> +	u32 chan_id =  spec->args[0];
>> +	int ret;
>> +
>> +	if (!spec->args_count)
>> +		return NULL;
>> +
>> +	/* if args_count is 1 driver use default settings */
>> +	if (spec->args_count > 1) {
>> +		ret = update_client_configs(ofdma, spec);
>> +		if (!ret)
>> +			return NULL;
>> +	}
>> +
>> +	return dma_get_slave_channel(&d->chans[chan_id].vchan.chan);
>> +}
>> +
>> +static void ldma_dma_init_v22(int i, struct ldma_dev *d)
>> +{
>> +	struct ldma_chan *c;
>> +
>> +	c = &d->chans[i];
>> +	c->nr = i; /* Real channel number */
>> +	c->rst = DMA_CHAN_RST;
>> +	c->desc_num = DMA_DFT_DESC_NUM;
>> +	snprintf(c->name, sizeof(c->name), "chan%d", c->nr);
>> +	INIT_WORK(&c->work, dma_work);
>> +	c->vchan.desc_free = dma_free_desc_resource;
>> +	vchan_init(&c->vchan, &d->dma_dev);
>> +}
>> +
>> +static void ldma_dma_init_v3X(int i, struct ldma_dev *d)
>> +{
>> +	struct ldma_chan *c;
>> +
>> +	c = &d->chans[i];
>> +	c->data_endian = DMA_DFT_ENDIAN;
>> +	c->desc_endian = DMA_DFT_ENDIAN;
>> +	c->data_endian_en = false;
>> +	c->desc_endian_en = false;
>> +	c->desc_rx_np = false;
>> +	c->flags |= DEVICE_ALLOC_DESC;
>> +	c->onoff = DMA_CH_OFF;
>> +	c->rst = DMA_CHAN_RST;
>> +	c->abc_en = true;
>> +	c->hdrm_csum = false;
>> +	c->boff_len = 0;
>> +	c->nr = i;
>> +	c->vchan.desc_free = dma_free_desc_resource;
>> +	vchan_init(&c->vchan, &d->dma_dev);
>> +}
>> +
>> +static int ldma_init_v22(struct ldma_dev *d, struct platform_device
>> *pdev)
>> +{
>> +	int ret;
>> +
>> +	ret = device_property_read_u32(d->dev, "dma-channels", &d-
>>> chan_nrs);
>> +	if (ret < 0) {
>> +		dev_err(d->dev, "unable to read dma-channels property\n");
>> +		return ret;
>> +	}
>> +
>> +	d->irq = platform_get_irq(pdev, 0);
>> +	if (d->irq < 0)
>> +		return d->irq;
>> +
>> +	ret = devm_request_irq(&pdev->dev, d->irq, dma_interrupt, 0,
>> +			       DRIVER_NAME, d);
>> +	if (ret)
>> +		return ret;
>> +
>> +	d->wq = alloc_ordered_workqueue("dma_wq", WQ_MEM_RECLAIM |
>> +			WQ_HIGHPRI);
>> +	if (!d->wq)
>> +		return -ENOMEM;
>> +
>> +	return 0;
>> +}
>> +
>> +static void ldma_clk_disable(void *data)
>> +{
>> +	struct ldma_dev *d = data;
>> +
>> +	clk_disable_unprepare(d->core_clk);
>> +	reset_control_assert(d->rst);
>> +}
>> +
>> +static struct dma_dev_ops dma0_ops = {
>> +	.device_alloc_chan_resources = dma_alloc_chan_resources,
>> +	.device_free_chan_resources = dma_free_chan_resources,
>> +	.device_config = dma_slave_config,
>> +	.device_prep_slave_sg = dma_prep_slave_sg,
>> +	.device_tx_status = dma_tx_status,
>> +	.device_pause = dma_pause_chan,
>> +	.device_resume = dma_resume_chan,
>> +	.device_terminate_all = dma_terminate_all,
>> +	.device_synchronize = dma_synchronize,
>> +	.device_issue_pending = dma_issue_pending,
>> +};
>> +
>> +static struct dma_dev_ops hdma_ops = {
>> +	.device_alloc_chan_resources = dma_alloc_chan_resources,
>> +	.device_free_chan_resources = dma_free_chan_resources,
>> +	.device_terminate_all = dma_terminate_all,
>> +	.device_issue_pending = dma_issue_pending,
>> +	.device_tx_status = dma_tx_status,
>> +	.device_resume = dma_resume_chan,
>> +	.device_pause = dma_pause_chan,
>> +};
> It is not easy to see, as the ordering is different, but all the functions
> for hdma_ops are the same as for dma0_ops. And these structs are only used
> as template, assigning the function pointers one by one to the dma_device struct.
> So why not assign the functions directly in the probe function,
> with a check for "dma0" on the slave functions?
> Anyway, if you keep this, you should change them to "const".
If we use "const" here
  .ops = &hdma_ops,
initialization discards 'const' qualifier from pointer target type

>
>> +
>> +static const struct ldma_inst_data dma0 = {
>> +	.name = "dma0",
>> +	.ops = &dma0_ops,
>> +};
>> +
>> +static const struct ldma_inst_data dma2tx = {
>> +	.name = "dma2tx",
>> +	.type = DMA_TYPE_TX,
>> +	.ops = &hdma_ops,
>> +};
>> +
>> +static const struct ldma_inst_data dma1rx = {
>> +	.name = "dma1rx",
>> +	.type = DMA_TYPE_RX,
>> +	.ops = &hdma_ops,
>> +};
>> +
>> +static const struct ldma_inst_data dma1tx = {
>> +	.name = "dma1tx",
>> +	.type = DMA_TYPE_TX,
>> +	.ops = &hdma_ops,
>> +};
>> +
>> +static const struct ldma_inst_data dma0tx = {
>> +	.name = "dma0tx",
>> +	.type = DMA_TYPE_TX,
>> +	.ops = &hdma_ops,
>> +};
>> +
>> +static const struct ldma_inst_data dma3 = {
>> +	.name = "dma3",
>> +	.type = DMA_TYPE_MCPY,
>> +	.ops = &hdma_ops,
>> +};
>> +
>> +static const struct ldma_inst_data toe_dma30 = {
>> +	.name = "toe_dma30",
>> +	.type = DMA_TYPE_MCPY,
>> +	.ops = &hdma_ops,
>> +};
>> +
>> +static const struct ldma_inst_data toe_dma31 = {
>> +	.name = "toe_dma31",
>> +	.type = DMA_TYPE_MCPY,
>> +	.ops = &hdma_ops,
>> +};
>> +
>> +static const struct of_device_id intel_ldma_match[] = {
>> +	{ .compatible = "intel,lgm-cdma", .data = &dma0},
>> +	{ .compatible = "intel,lgm-dma2tx", .data = &dma2tx},
>> +	{ .compatible = "intel,lgm-dma1rx", .data = &dma1rx},
>> +	{ .compatible = "intel,lgm-dma1tx", .data = &dma1tx},
>> +	{ .compatible = "intel,lgm-dma0tx", .data = &dma0tx},
>> +	{ .compatible = "intel,lgm-dma3", .data = &dma3},
>> +	{ .compatible = "intel,lgm-toe-dma30", .data = &toe_dma30},
>> +	{ .compatible = "intel,lgm-toe-dma31", .data = &toe_dma31},
>> +	{}
>> +};
> If you accept the suggestion I did on the binding, the ".data" should
> probably point directly to the ".ops", or just a flag for the type.
> Which also makes the "name" in the structs obsolete, as they are not
> per instance anymore.
>
>> +
>> +static int intel_ldma_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct dma_device *dma_dev;
>> +	unsigned long ch_mask;
>> +	struct ldma_chan *c;
>> +	struct ldma_port *p;
>> +	struct ldma_dev *d;
>> +	u32 id, bitn = 32, j;
>> +	int i, ret;
>> +
>> +	d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
>> +	if (!d)
>> +		return -ENOMEM;
>> +
>> +	/* Link controller to platform device */
>> +	d->dev = &pdev->dev;
>> +
>> +	d->inst = device_get_match_data(dev);
>> +	if (!d->inst) {
>> +		dev_err(dev, "No device match found\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	d->base = devm_platform_ioremap_resource(pdev, 0);
>> +	if (IS_ERR(d->base))
>> +		return PTR_ERR(d->base);
>> +
>> +	/* Power up and reset the dma engine, some DMAs always on?? */
>> +	d->core_clk = devm_clk_get_optional(dev, NULL);
>> +	if (IS_ERR(d->core_clk))
>> +		return PTR_ERR(d->core_clk);
>> +	clk_prepare_enable(d->core_clk);
>> +
>> +	d->rst = devm_reset_control_get_optional(dev, NULL);
>> +	if (IS_ERR(d->rst))
>> +		return PTR_ERR(d->rst);
>> +	reset_control_deassert(d->rst);
>> +
>> +	ret = devm_add_action_or_reset(dev, ldma_clk_disable, d);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to devm_add_action_or_reset, %d\n",
>> ret);
>> +		return ret;
>> +	}
>> +
>> +	id = readl(d->base + DMA_ID);
>> +	d->chan_nrs = FIELD_GET(DMA_ID_CHNR, id);
>> +	d->port_nrs = FIELD_GET(DMA_ID_PNR, id);
>> +	d->ver = FIELD_GET(DMA_ID_REV, id);
>> +
>> +	if (id & DMA_ID_AW_36B)
>> +		d->flags |= DMA_ADDR_36BIT;
>> +
>> +	if (IS_ENABLED(CONFIG_64BIT) && (id & DMA_ID_AW_36B))
>> +		bitn = 36;
>> +
>> +	if (id & DMA_ID_DW_128B)
>> +		d->flags |= DMA_DATA_128BIT;
>> +
>> +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(bitn));
>> +	if (ret) {
>> +		dev_err(dev, "No usable DMA configuration\n");
>> +		return ret;
>> +	}
>> +
>> +	if (d->ver == DMA_VER22) {
>> +		ret = ldma_init_v22(d, pdev);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	ret = device_property_read_u32(dev, "dma-channel-mask", &d-
>>> channels_mask);
>> +	if (ret < 0)
>> +		d->channels_mask = GENMASK(d->chan_nrs - 1, 0);
>> +
>> +	dma_dev = &d->dma_dev;
>> +
>> +	dma_cap_zero(dma_dev->cap_mask);
>> +	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
>> +
>> +	/* Channel initializations */
>> +	INIT_LIST_HEAD(&dma_dev->channels);
>> +
>> +	/* Port Initializations */
>> +	d->ports = devm_kcalloc(dev, d->port_nrs, sizeof(*p),
>> GFP_KERNEL);
>> +	if (!d->ports)
>> +		return -ENOMEM;
>> +
>> +	/* Channels Initializations */
>> +	d->chans = devm_kcalloc(d->dev, d->chan_nrs, sizeof(*c),
>> GFP_KERNEL);
>> +	if (!d->chans)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < d->port_nrs; i++) {
>> +		p = &d->ports[i];
>> +		p->portid = i;
>> +		p->ldev = d;
>> +	}
>> +
>> +	ret = ldma_cfg_init(d);
>> +	if (ret)
>> +		return ret;
>> +
>> +	dma_dev->dev = &pdev->dev;
>> +
>> +	ch_mask = (unsigned long)d->channels_mask;
>> +	for_each_set_bit(j, &ch_mask, d->chan_nrs) {
>> +		if (d->ver == DMA_VER22)
>> +			ldma_dma_init_v22(j, d);
>> +		else
>> +			ldma_dma_init_v3X(j, d);
>> +	}
>> +
>> +	dma_dev->device_alloc_chan_resources =
>> +		d->inst->ops->device_alloc_chan_resources;
>> +	dma_dev->device_free_chan_resources =
>> +		d->inst->ops->device_free_chan_resources;
>> +	dma_dev->device_terminate_all = d->inst->ops-
>>> device_terminate_all;
>> +	dma_dev->device_issue_pending = d->inst->ops-
>>> device_issue_pending;
>> +	dma_dev->device_tx_status = d->inst->ops->device_tx_status;
>> +	dma_dev->device_resume = d->inst->ops->device_resume;
>> +	dma_dev->device_pause = d->inst->ops->device_pause;
>> +	dma_dev->device_config = d->inst->ops->device_config;
>> +	dma_dev->device_prep_slave_sg = d->inst->ops-
>>> device_prep_slave_sg;
>> +	dma_dev->device_synchronize = d->inst->ops->device_synchronize;
>> +
>> +	if (d->ver == DMA_VER22) {
>> +		dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
>> +		dma_dev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
>> +		dma_dev->directions = BIT(DMA_MEM_TO_DEV) |
>> +				      BIT(DMA_DEV_TO_MEM);
>> +		dma_dev->residue_granularity =
>> +					DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
>> +	}
>> +
>> +	platform_set_drvdata(pdev, d);
>> +
>> +	ldma_dev_init(d);
>> +
>> +	ret = dma_async_device_register(dma_dev);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to register slave DMA engine
>> device\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = of_dma_controller_register(pdev->dev.of_node, ldma_xlate,
>> d);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to register of DMA controller\n");
>> +		dma_async_device_unregister(dma_dev);
>> +		return ret;
>> +	}
>> +
>> +	dev_info(dev, "Init done - rev: %x, ports: %d channels: %d\n", d-
>>> ver,
>> +		 d->port_nrs, d->chan_nrs);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct platform_driver intel_ldma_driver = {
>> +	.probe = intel_ldma_probe,
>> +	.driver = {
>> +		.name = DRIVER_NAME,
>> +		.of_match_table = intel_ldma_match,
>> +	},
>> +};
>> +
>> +/*
>> + * Perform this driver as device_initcall to make sure initialization
>> happens
>> + * before its DMA clients of some are platform specific and also to
>> provide
>> + * registered DMA channels and DMA capabilities to clients before
>> their
>> + * initialization.
>> + */
>> +static int __init intel_ldma_init(void)
>> +{
>> +	return platform_driver_register(&intel_ldma_driver);
>> +}
>> +
>> +device_initcall(intel_ldma_init);
>> diff --git a/include/linux/dma/lgm_dma.h b/include/linux/dma/lgm_dma.h
>> new file mode 100644
>> index 000000000000..3a2ee6ad0710
>> --- /dev/null
>> +++ b/include/linux/dma/lgm_dma.h
>> @@ -0,0 +1,27 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (c) 2016 ~ 2019 Intel Corporation.
> We already have 2020
thanks, i will update to 2020.
>
>> + */
>> +#ifndef LGM_DMA_H
>> +#define LGM_DMA_H
>> +
>> +#include <linux/types.h>
>> +#include <linux/dmaengine.h>
>> +
>> +/*!
>> + * \fn int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
>> desc_base,
>> + *                                 int desc_num)
>> + * \brief Configure low level channel descriptors
>> + * \param[in] chan   pointer to DMA channel that the client is using
>> + * \param[in] desc_base   descriptor base physical address
>> + * \param[in] desc_num   number of descriptors
>> + * \return   0 on success
>> + * \return   kernel bug reported on failure
>> + *
>> + * This function configure the low level channel descriptors. It will
>> be
>> + * used by CBM whose descriptor is not DDR, actually some registers.
> The term "CBM" is not known to the community.
> If this is needed for the CBM driver, I would suggest adding it together with that driver.
"CBM" refers central buffer manager. Next we are going to upstream "CBM" 
as a part of datapath drivers.
>
>> + */
>> +int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t
>> desc_base,
>> +			    int desc_num);
>> +
>> +#endif /* LGM_DMA_H */
>> --
>> 2.11.0
>
> Best regards,
> Thomas

Re: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel LGM SOC

[Reddy, MallikarjunaX]

Hi Thomas,
Thanks for the review, my comments inline.

On 10/28/2020 3:24 AM, Thomas Langer wrote:
> Hello Reddy,
>
> I think "Intel" should always be written with a capital "I" (like in the Subject, but except in the binding below)
OK.
>
>> + compatible:
>> +  oneOf:
>> +   - const: intel,lgm-cdma
>> +   - const: intel,lgm-dma2tx
>> +   - const: intel,lgm-dma1rx
>> +   - const: intel,lgm-dma1tx
>> +   - const: intel,lgm-dma0tx
>> +   - const: intel,lgm-dma3
>> +   - const: intel,lgm-toe-dma30
>> +   - const: intel,lgm-toe-dma31
> Bindings are normally not per instance.
> What if next generation chip gets more DMA modules but has no other changes in the HW block?
> What is wrong with
>    - const: intel,lgm-cdma
>    - const: intel,lgm-hdma
> and extra attributes to define the rx/tx restriction (or what do it mean?)?
>  From the driver code I saw that "toe" is also just of type "hdma" and no further differences in code are done.
We had a discussion on the same in the previous patches and Rob Herring 
said Okay using Different compatibles.
below the snippet.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 >>> + compatible:
 >>> +  anyOf:
 >>> +   - const: intel,lgm-cdma
 >>> +   - const: intel,lgm-dma2tx
 >>> +   - const: intel,lgm-dma1rx
 >>> +   - const: intel,lgm-dma1tx
 >>> +   - const: intel,lgm-dma0tx
 >>> +   - const: intel,lgm-dma3
 >>> +   - const: intel,lgm-toe-dma30
 >>> +   - const: intel,lgm-toe-dma31
 >> Please explain why you need so many different compatible strings.
 > This hw dma has 7 DMA instances.
 > Some for datapath, some for memcpy  and some for TOE.
 > Some for TX only, some for RX only, and some for TX/RX(memcpy and ToE).
 >
 > dma TX/RX type we considered as driver specific data of each instance and
 > used different compatible strings for each instance.
 > And also idea is in future if any driver specific data of any particular
 > instance we can handle.
 >
 > Here if dma name and type(tx or rx) will be accepted as devicetree
 > attributes then we can move .name = "toe_dma31", & .type = DMA_TYPE_MCPY
 > to devicetree. So that the compatible strings can be limited to two.
 > intel,lgm-cdma & intel,lgm-hdma .

[Rob]
Different compatibles are okay if the instances are different and we
don't have properties to describe the differences.

For some of what you have in this binding, I think it should be part of
the consumer cells.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
> Best regards,
> Thomas
>

RE: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel LGM SOC

[Thomas Langer]

> -----Original Message-----
> From: Reddy, MallikarjunaX <mallikarjunax.reddy@linux.intel.com>
> Sent: Montag, 2. November 2020 15:42
> To: Thomas Langer <tlanger@maxlinear.com>; dmaengine@vger.kernel.org;
> vkoul@kernel.org; devicetree@vger.kernel.org; robh+dt@kernel.org
> Cc: linux-kernel@vger.kernel.org; Shevchenko, Andriy
> <andriy.shevchenko@intel.com>; chuanhua.lei@linux.intel.com; Kim,
> Cheol Yong <Cheol.Yong.Kim@intel.com>; Wu, Qiming <qi-
> ming.wu@intel.com>; malliamireddy009@gmail.com; peter.ujfalusi@ti.com;
> Langer, Thomas <thomas.langer@intel.com>
> Subject: Re: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel
> LGM SOC
> 
> This email was sent from outside of MaxLinear.
> 
> 
> Hi Thomas,
> Thanks for the review, my comments inline.
> 
> On 10/28/2020 3:24 AM, Thomas Langer wrote:
> > Hello Reddy,
> >
> > I think "Intel" should always be written with a capital "I" (like in
> the Subject, but except in the binding below)
> OK.
> >
> >> + compatible:
> >> +  oneOf:
> >> +   - const: intel,lgm-cdma
> >> +   - const: intel,lgm-dma2tx
> >> +   - const: intel,lgm-dma1rx
> >> +   - const: intel,lgm-dma1tx
> >> +   - const: intel,lgm-dma0tx
> >> +   - const: intel,lgm-dma3
> >> +   - const: intel,lgm-toe-dma30
> >> +   - const: intel,lgm-toe-dma31
> > Bindings are normally not per instance.
> > What if next generation chip gets more DMA modules but has no other
> changes in the HW block?
> > What is wrong with
> >    - const: intel,lgm-cdma
> >    - const: intel,lgm-hdma
> > and extra attributes to define the rx/tx restriction (or what do it
> mean?)?
> >  From the driver code I saw that "toe" is also just of type "hdma"
> and no further differences in code are done.
> We had a discussion on the same in the previous patches and Rob
> Herring
> said Okay using Different compatibles.
> below the snippet.
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +
>  >>> + compatible:
>  >>> +  anyOf:
>  >>> +   - const: intel,lgm-cdma
>  >>> +   - const: intel,lgm-dma2tx
>  >>> +   - const: intel,lgm-dma1rx
>  >>> +   - const: intel,lgm-dma1tx
>  >>> +   - const: intel,lgm-dma0tx
>  >>> +   - const: intel,lgm-dma3
>  >>> +   - const: intel,lgm-toe-dma30
>  >>> +   - const: intel,lgm-toe-dma31
>  >> Please explain why you need so many different compatible strings.
>  > This hw dma has 7 DMA instances.
>  > Some for datapath, some for memcpy  and some for TOE.
>  > Some for TX only, some for RX only, and some for TX/RX(memcpy and
> ToE).
>  >
>  > dma TX/RX type we considered as driver specific data of each
> instance and
>  > used different compatible strings for each instance.
>  > And also idea is in future if any driver specific data of any
> particular
>  > instance we can handle.
>  >
>  > Here if dma name and type(tx or rx) will be accepted as devicetree
>  > attributes then we can move .name = "toe_dma31", & .type =
> DMA_TYPE_MCPY
>  > to devicetree. So that the compatible strings can be limited to
> two.
>  > intel,lgm-cdma & intel,lgm-hdma .
> 
> [Rob]
> Different compatibles are okay if the instances are different and we
> don't have properties to describe the differences.

Okay, but then explain what the differences are, that cannot be described
by other properties/attributes. In the driver code I cannot see anything,
except the "name". But for printouts in driver, "drv_dbg" or similar will
just use the node path for the instance.

> 
> For some of what you have in this binding, I think it should be part
> of
> the consumer cells.
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ++
> >
> > Best regards,
> > Thomas
> >

Re: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel LGM SOC

[Reddy, MallikarjunaX]

Hi Thomas,

On 11/11/2020 1:39 AM, Thomas Langer wrote:
>
>> -----Original Message-----
>> From: Reddy, MallikarjunaX <mallikarjunax.reddy@linux.intel.com>
>> Sent: Montag, 2. November 2020 15:42
>> To: Thomas Langer <tlanger@maxlinear.com>; dmaengine@vger.kernel.org;
>> vkoul@kernel.org; devicetree@vger.kernel.org; robh+dt@kernel.org
>> Cc: linux-kernel@vger.kernel.org; Shevchenko, Andriy
>> <andriy.shevchenko@intel.com>; chuanhua.lei@linux.intel.com; Kim,
>> Cheol Yong <Cheol.Yong.Kim@intel.com>; Wu, Qiming <qi-
>> ming.wu@intel.com>; malliamireddy009@gmail.com; peter.ujfalusi@ti.com;
>> Langer, Thomas <thomas.langer@intel.com>
>> Subject: Re: [PATCH v7 1/2] dt-bindings: dma: Add bindings for intel
>> LGM SOC
>>
>> This email was sent from outside of MaxLinear.
>>
>>
>> Hi Thomas,
>> Thanks for the review, my comments inline.
>>
>> On 10/28/2020 3:24 AM, Thomas Langer wrote:
>>> Hello Reddy,
>>>
>>> I think "Intel" should always be written with a capital "I" (like in
>> the Subject, but except in the binding below)
>> OK.
>>>> + compatible:
>>>> +  oneOf:
>>>> +   - const: intel,lgm-cdma
>>>> +   - const: intel,lgm-dma2tx
>>>> +   - const: intel,lgm-dma1rx
>>>> +   - const: intel,lgm-dma1tx
>>>> +   - const: intel,lgm-dma0tx
>>>> +   - const: intel,lgm-dma3
>>>> +   - const: intel,lgm-toe-dma30
>>>> +   - const: intel,lgm-toe-dma31
>>> Bindings are normally not per instance.
>>> What if next generation chip gets more DMA modules but has no other
>> changes in the HW block?
>>> What is wrong with
>>>     - const: intel,lgm-cdma
>>>     - const: intel,lgm-hdma
>>> and extra attributes to define the rx/tx restriction (or what do it
>> mean?)?
>>>   From the driver code I saw that "toe" is also just of type "hdma"
>> and no further differences in code are done.
>> We had a discussion on the same in the previous patches and Rob
>> Herring
>> said Okay using Different compatibles.
>> below the snippet.
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> +
>>   >>> + compatible:
>>   >>> +  anyOf:
>>   >>> +   - const: intel,lgm-cdma
>>   >>> +   - const: intel,lgm-dma2tx
>>   >>> +   - const: intel,lgm-dma1rx
>>   >>> +   - const: intel,lgm-dma1tx
>>   >>> +   - const: intel,lgm-dma0tx
>>   >>> +   - const: intel,lgm-dma3
>>   >>> +   - const: intel,lgm-toe-dma30
>>   >>> +   - const: intel,lgm-toe-dma31
>>   >> Please explain why you need so many different compatible strings.
>>   > This hw dma has 7 DMA instances.
>>   > Some for datapath, some for memcpy  and some for TOE.
>>   > Some for TX only, some for RX only, and some for TX/RX(memcpy and
>> ToE).
>>   >
>>   > dma TX/RX type we considered as driver specific data of each
>> instance and
>>   > used different compatible strings for each instance.
>>   > And also idea is in future if any driver specific data of any
>> particular
>>   > instance we can handle.
>>   >
>>   > Here if dma name and type(tx or rx) will be accepted as devicetree
>>   > attributes then we can move .name = "toe_dma31", & .type =
>> DMA_TYPE_MCPY
>>   > to devicetree. So that the compatible strings can be limited to
>> two.
>>   > intel,lgm-cdma & intel,lgm-hdma .
>>
>> [Rob]
>> Different compatibles are okay if the instances are different and we
>> don't have properties to describe the differences.
> Okay, but then explain what the differences are, that cannot be described
> by other properties/attributes. In the driver code I cannot see anything,
> except the "name". But for printouts in driver, "drv_dbg" or similar will
> just use the node path for the instance.
On patch4 series we had the same discussion.
i will brief it here again.

This hw dma has 7 DMA instances, and each Some for TX only, some for RX 
only, and some for TX/RX.

dma TX/RX type we considered as driver specific data and it cant be used 
as dt property as per the previous reviewers.

So i moved it to driver specific data.

If type(tx or rx) will be accepted as devicetree attributes then we can 
move it to devicetree.

So as you said we can limit compatible strings can be limited to two. 
intel,lgm-cdma & intel,lgm-hdma .

One more advantage i see with this model is in future if any driver 
specific data of any particular instance we can handle easily.
>
>> For some of what you have in this binding, I think it should be part
>> of
>> the consumer cells.
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> ++
>>> Best regards,
>>> Thomas
>>>