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* [PATCH v5 0/8] Add Rockchip SFC(serial flash controller) support
@ 2021-06-07 12:42 Jon Lin
  2021-06-07 12:42 ` [PATCH v5 1/8] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller Jon Lin
                   ` (4 more replies)
  0 siblings, 5 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:42 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel



Changes in v5:
- Add support in device trees for rv1126
- Support sfc tx_dual, tx_quad
- Simplify the code, such as remove "rockchip_sfc_register_all"
- Support SFC ver4 ver5

Changes in v4:
- Changing patch back to an "RFC". An engineer from Rockchip
  reached out to me to let me know they are working on this patch for
  upstream, I am submitting this v4 for the community to see however
  I expect Jon Lin (jon.lin@rock-chips.com) will submit new patches
  soon and these are the ones we should pursue for mainlining. Jon's
  patch series should include support for more hardware than this
  series.
- Clean up documentation more and ensure it is correct per
  make dt_binding_check.
- Add support in device trees for rk3036, rk3308, and rv1108.
- Add ahb clock (hclk_sfc) support for rk3036.
- Change rockchip_sfc_wait_fifo_ready() to use a switch statement.
- Change IRQ code to only mark IRQ as handled if it handles the
  specific IRQ (DMA transfer finish) it is supposed to handle.

Changes in v3:
- Changed the name of the clocks to sfc/ahb (from clk-sfc/clk-hsfc).
- Changed the compatible string from rockchip,sfc to
  rockchip,rk3036-sfc. A quick glance at the datasheets suggests this
  driver should work for the PX30, RK180x, RK3036, RK312x, RK3308 and
  RV1108 SoCs, and possibly more. However, I am currently only able
  to test this on a PX30 (an RK3326). The technical reference manuals
  appear to list the same registers for each device.
- Corrected devicetree documentation for formatting and to note these
  changes.
- Replaced the maintainer with Heiko Stuebner and myself, as we will
  take ownership of this going forward.
- Noted that the device (per the reference manual) supports 4 CS, but
  I am only able to test a single CS (CS 0).
- Reordered patches to comply with upstream rules.

Changes in v2:
- Reimplemented driver using spi-mem subsystem.
- Removed power management code as I couldn't get it working properly.
- Added device tree bindings for Odroid Go Advance.

Changes in v1:
hanges made in this new series versus the v8 of the old series:
- Added function to read spi-rx-bus-width from device tree, in the
  event that the SPI chip supports 4x mode but only has 2 pins
  wired (such as the Odroid Go Advance).
- Changed device tree documentation from txt to yaml format.
- Made "reset" message a dev_dbg from a dev_info.
- Changed read and write fifo functions to remove redundant checks.
- Changed the write and read from relaxed to non-relaxed when
  starting the DMA transfer or reading the DMA IRQ.
- Changed from dma_coerce_mask_and_coherent to just
  dma_set_mask_and_coherent.
- Changed name of get_if_type to rockchip_sfc_get_if_type.

Chris Morgan (8):
  dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash
    controller
  spi: rockchip-sfc: add rockchip serial flash controller
  arm64: dts: rockchip: Add SFC to PX30
  clk: rockchip: Add support for hclk_sfc on rk3036
  arm: dts: rockchip: Add SFC to RK3036
  arm: dts: rockchip: Add SFC to RV1108
  arm64: dts: rockchip: Add SFC to RK3308
  arm64: dts: rockchip: Enable SFC for Odroid Go Advance

 .../devicetree/bindings/spi/rockchip-sfc.yaml |  86 ++
 arch/arm/boot/dts/rk3036.dtsi                 |  42 +
 arch/arm/boot/dts/rv1108.dtsi                 |  37 +
 arch/arm64/boot/dts/rockchip/px30.dtsi        |  38 +
 arch/arm64/boot/dts/rockchip/rk3308.dtsi      |  37 +
 .../boot/dts/rockchip/rk3326-odroid-go2.dts   |  16 +
 drivers/clk/rockchip/clk-rk3036.c             |   2 +-
 drivers/spi/Kconfig                           |   9 +
 drivers/spi/Makefile                          |   1 +
 drivers/spi/spi-rockchip-sfc.c                | 863 ++++++++++++++++++
 include/dt-bindings/clock/rk3036-cru.h        |   1 +
 11 files changed, 1131 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/spi/rockchip-sfc.yaml
 create mode 100644 drivers/spi/spi-rockchip-sfc.c

-- 
2.17.1




^ permalink raw reply	[flat|nested] 10+ messages in thread

* [PATCH v5 1/8] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller
  2021-06-07 12:42 [PATCH v5 0/8] Add Rockchip SFC(serial flash controller) support Jon Lin
@ 2021-06-07 12:42 ` Jon Lin
  2021-06-07 12:42 ` [PATCH v5 2/8] spi: rockchip-sfc: add rockchip " Jon Lin
                   ` (3 subsequent siblings)
  4 siblings, 0 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:42 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

Add bindings for the Rockchip serial flash controller. New device
specific parameter of rockchip,sfc-no-dma included in documentation.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5:
- Add support in device trees for rv1126
- Support sfc tx_dual, tx_quad
- Simplify the code, such as remove "rockchip_sfc_register_all"
- Support SFC ver4 ver5

Changes in v4:
- Changing patch back to an "RFC". An engineer from Rockchip
  reached out to me to let me know they are working on this patch for
  upstream, I am submitting this v4 for the community to see however
  I expect Jon Lin (jon.lin@rock-chips.com) will submit new patches
  soon and these are the ones we should pursue for mainlining. Jon's
  patch series should include support for more hardware than this
  series.
- Clean up documentation more and ensure it is correct per
  make dt_binding_check.
- Add support in device trees for rk3036, rk3308, and rv1108.
- Add ahb clock (hclk_sfc) support for rk3036.
- Change rockchip_sfc_wait_fifo_ready() to use a switch statement.
- Change IRQ code to only mark IRQ as handled if it handles the
  specific IRQ (DMA transfer finish) it is supposed to handle.

Changes in v3:
- Changed the name of the clocks to sfc/ahb (from clk-sfc/clk-hsfc).
- Changed the compatible string from rockchip,sfc to
  rockchip,rk3036-sfc. A quick glance at the datasheets suggests this
  driver should work for the PX30, RK180x, RK3036, RK312x, RK3308 and
  RV1108 SoCs, and possibly more. However, I am currently only able
  to test this on a PX30 (an RK3326). The technical reference manuals
  appear to list the same registers for each device.
- Corrected devicetree documentation for formatting and to note these
  changes.
- Replaced the maintainer with Heiko Stuebner and myself, as we will
  take ownership of this going forward.
- Noted that the device (per the reference manual) supports 4 CS, but
  I am only able to test a single CS (CS 0).
- Reordered patches to comply with upstream rules.

Changes in v2:
- Reimplemented driver using spi-mem subsystem.
- Removed power management code as I couldn't get it working properly.
- Added device tree bindings for Odroid Go Advance.

Changes in v1:
hanges made in this new series versus the v8 of the old series:
- Added function to read spi-rx-bus-width from device tree, in the
  event that the SPI chip supports 4x mode but only has 2 pins
  wired (such as the Odroid Go Advance).
- Changed device tree documentation from txt to yaml format.
- Made "reset" message a dev_dbg from a dev_info.
- Changed read and write fifo functions to remove redundant checks.
- Changed the write and read from relaxed to non-relaxed when
  starting the DMA transfer or reading the DMA IRQ.
- Changed from dma_coerce_mask_and_coherent to just
  dma_set_mask_and_coherent.
- Changed name of get_if_type to rockchip_sfc_get_if_type.

 .../devicetree/bindings/spi/rockchip-sfc.yaml | 86 +++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/rockchip-sfc.yaml

diff --git a/Documentation/devicetree/bindings/spi/rockchip-sfc.yaml b/Documentation/devicetree/bindings/spi/rockchip-sfc.yaml
new file mode 100644
index 000000000000..120c06f86a28
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/rockchip-sfc.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/rockchip-sfc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip Serial Flash Controller (SFC)
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+  - Chris Morgan <macromorgan@hotmail.com>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - const: rockchip,rk3036-sfc
+      - items:
+          - enum:
+              - rockchip,px30-sfc
+              - rockchip,rk3308-sfc
+              - rockchip,rv1108-sfc
+          - const: rockchip,rk3036-sfc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Bus Clock
+      - description: Module Clock
+
+  clock-names:
+    items:
+      - const: ahb
+      - const: sfc
+
+  power-domains:
+    maxItems: 1
+
+  rockchip,sfc-no-dma:
+    description: Disable DMA and utilize FIFO mode only
+    type: boolean
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/px30-cru.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/px30-power.h>
+
+    sfc: spi@ff3a0000 {
+        compatible = "rockchip,px30-sfc","rockchip,rk3036-sfc";
+        reg = <0xff3a0000 0x4000>;
+        interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&cru HCLK_SFC>, <&cru SCLK_SFC>;
+        clock-names = "ahb", "sfc";
+        pinctrl-0 = <&sfc_clk &sfc_cs &sfc_bus2>;
+        pinctrl-names = "default";
+        power-domains = <&power PX30_PD_MMC_NAND>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+            compatible = "jedec,spi-nor";
+            reg = <0>;
+            spi-max-frequency = <108000000>;
+            spi-rx-bus-width = <2>;
+            spi-tx-bus-width = <2>;
+        };
+    };
+
+...
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH v5 2/8] spi: rockchip-sfc: add rockchip serial flash controller
  2021-06-07 12:42 [PATCH v5 0/8] Add Rockchip SFC(serial flash controller) support Jon Lin
  2021-06-07 12:42 ` [PATCH v5 1/8] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller Jon Lin
@ 2021-06-07 12:42 ` Jon Lin
  2021-06-07 15:28   ` Chris Morgan
  2021-06-07 12:42 ` [PATCH v5 3/8] arm64: dts: rockchip: Add SFC to PX30 Jon Lin
                   ` (2 subsequent siblings)
  4 siblings, 1 reply; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:42 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

Add the rockchip serial flash controller (SFC) driver.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 drivers/spi/Kconfig            |   9 +
 drivers/spi/Makefile           |   1 +
 drivers/spi/spi-rockchip-sfc.c | 863 +++++++++++++++++++++++++++++++++
 3 files changed, 873 insertions(+)
 create mode 100644 drivers/spi/spi-rockchip-sfc.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index e71a4c514f7b..d89e5f3c9107 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -658,6 +658,15 @@ config SPI_ROCKCHIP
 	  The main usecase of this controller is to use spi flash as boot
 	  device.
 
+config SPI_ROCKCHIP_SFC
+	tristate "Rockchip Serial Flash Controller (SFC)"
+	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	depends on HAS_IOMEM && HAS_DMA
+	help
+	  This enables support for Rockchip serial flash controller. This
+	  is a specialized controller used to access SPI flash on some
+	  Rockchip SOCs.
+
 config SPI_RB4XX
 	tristate "Mikrotik RB4XX SPI master"
 	depends on SPI_MASTER && ATH79
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 13e54c45e9df..699db95c8441 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_SPI_QCOM_GENI)		+= spi-geni-qcom.o
 obj-$(CONFIG_SPI_QCOM_QSPI)		+= spi-qcom-qspi.o
 obj-$(CONFIG_SPI_QUP)			+= spi-qup.o
 obj-$(CONFIG_SPI_ROCKCHIP)		+= spi-rockchip.o
+obj-$(CONFIG_SPI_ROCKCHIP_SFC)		+= spi-rockchip-sfc.o
 obj-$(CONFIG_SPI_RB4XX)			+= spi-rb4xx.o
 obj-$(CONFIG_MACH_REALTEK_RTL)		+= spi-realtek-rtl.o
 obj-$(CONFIG_SPI_RPCIF)			+= spi-rpc-if.o
diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c
new file mode 100644
index 000000000000..ddce87a2f319
--- /dev/null
+++ b/drivers/spi/spi-rockchip-sfc.c
@@ -0,0 +1,863 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Rockchip Serial Flash Controller Driver
+//
+// Copyright (c) 2017, Rockchip Inc.
+// Author: Shawn Lin <shawn.lin@rock-chips.com>
+//
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/dma-mapping.h>
+#include <linux/iopoll.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/spi/spi-mem.h>
+
+/* System control */
+#define SFC_CTRL			0x0
+#define  SFC_CTRL_COMMON_BITS_1		0x0
+#define  SFC_CTRL_COMMON_BITS_2		0x1
+#define  SFC_CTRL_COMMON_BITS_4		0x2
+#define  SFC_CTRL_DATA_BITS_SHIFT	12
+#define  SFC_CTRL_ADDR_BITS_SHIFT	10
+#define  SFC_CTRL_CMD_BITS_SHIFT	8
+#define  SFC_CTRL_PHASE_SEL_NEGETIVE	BIT(1)
+
+/* Interrupt mask */
+#define SFC_IMR				0x4
+#define  SFC_IMR_RX_FULL		BIT(0)
+#define  SFC_IMR_RX_UFLOW		BIT(1)
+#define  SFC_IMR_TX_OFLOW		BIT(2)
+#define  SFC_IMR_TX_EMPTY		BIT(3)
+#define  SFC_IMR_TRAN_FINISH		BIT(4)
+#define  SFC_IMR_BUS_ERR		BIT(5)
+#define  SFC_IMR_NSPI_ERR		BIT(6)
+#define  SFC_IMR_DMA			BIT(7)
+
+/* Interrupt clear */
+#define SFC_ICLR			0x8
+#define  SFC_ICLR_RX_FULL		BIT(0)
+#define  SFC_ICLR_RX_UFLOW		BIT(1)
+#define  SFC_ICLR_TX_OFLOW		BIT(2)
+#define  SFC_ICLR_TX_EMPTY		BIT(3)
+#define  SFC_ICLR_TRAN_FINISH		BIT(4)
+#define  SFC_ICLR_BUS_ERR		BIT(5)
+#define  SFC_ICLR_NSPI_ERR		BIT(6)
+#define  SFC_ICLR_DMA			BIT(7)
+
+/* FIFO threshold level */
+#define SFC_FTLR			0xc
+#define  SFC_FTLR_TX_SHIFT		0
+#define  SFC_FTLR_TX_MASK		0x1f
+#define  SFC_FTLR_RX_SHIFT		8
+#define  SFC_FTLR_RX_MASK		0x1f
+
+/* Reset FSM and FIFO */
+#define SFC_RCVR			0x10
+#define  SFC_RCVR_RESET			BIT(0)
+
+/* Enhanced mode */
+#define SFC_AX				0x14
+
+/* Address Bit number */
+#define SFC_ABIT			0x18
+
+/* Interrupt status */
+#define SFC_ISR				0x1c
+#define  SFC_ISR_RX_FULL_SHIFT		BIT(0)
+#define  SFC_ISR_RX_UFLOW_SHIFT		BIT(1)
+#define  SFC_ISR_TX_OFLOW_SHIFT		BIT(2)
+#define  SFC_ISR_TX_EMPTY_SHIFT		BIT(3)
+#define  SFC_ISR_TX_FINISH_SHIFT	BIT(4)
+#define  SFC_ISR_BUS_ERR_SHIFT		BIT(5)
+#define  SFC_ISR_NSPI_ERR_SHIFT		BIT(6)
+#define  SFC_ISR_DMA_SHIFT		BIT(7)
+
+/* FIFO status */
+#define SFC_FSR				0x20
+#define  SFC_FSR_TX_IS_FULL		BIT(0)
+#define  SFC_FSR_TX_IS_EMPTY		BIT(1)
+#define  SFC_FSR_RX_IS_EMPTY		BIT(2)
+#define  SFC_FSR_RX_IS_FULL		BIT(3)
+#define  SFC_FSR_TXLV_MASK		GENMASK(12, 8)
+#define  SFC_FSR_TXLV_SHIFT		8
+#define  SFC_FSR_RXLV_MASK		GENMASK(20, 16)
+#define  SFC_FSR_RXLV_SHIFT		16
+
+/* FSM status */
+#define SFC_SR				0x24
+#define  SFC_SR_IS_IDLE			0x0
+#define  SFC_SR_IS_BUSY			0x1
+
+/* Raw interrupt status */
+#define SFC_RISR			0x28
+#define  SFC_RISR_RX_FULL		BIT(0)
+#define  SFC_RISR_RX_UNDERFLOW		BIT(1)
+#define  SFC_RISR_TX_OVERFLOW		BIT(2)
+#define  SFC_RISR_TX_EMPTY		BIT(3)
+#define  SFC_RISR_TRAN_FINISH		BIT(4)
+#define  SFC_RISR_BUS_ERR		BIT(5)
+#define  SFC_RISR_NSPI_ERR		BIT(6)
+#define  SFC_RISR_DMA			BIT(7)
+
+/* Master trigger */
+#define SFC_DMA_TRIGGER			0x80
+
+/* Src or Dst addr for master */
+#define SFC_DMA_ADDR			0x84
+
+/* Command */
+#define SFC_CMD				0x100
+#define  SFC_CMD_IDX_SHIFT		0
+#define  SFC_CMD_DUMMY_SHIFT		8
+#define  SFC_CMD_DIR_RD			0
+#define  SFC_CMD_DIR_WR			1
+#define  SFC_CMD_DIR_SHIFT		12
+#define  SFC_CMD_ADDR_ZERO		(0x0 << 14)
+#define  SFC_CMD_ADDR_24BITS		(0x1 << 14)
+#define  SFC_CMD_ADDR_32BITS		(0x2 << 14)
+#define  SFC_CMD_ADDR_FRS		(0x3 << 14)
+#define  SFC_CMD_TRAN_BYTES_SHIFT	16
+#define  SFC_CMD_CS_SHIFT		30
+
+/* Address */
+#define SFC_ADDR			0x104
+
+/* Data */
+#define SFC_DATA			0x108
+
+/* The controller and documentation reports that it supports up to 4 CS
+ * devices (0-3), however I have only been able to test a single CS (CS 0)
+ * due to the configuration of my device.
+ */
+#define SFC_MAX_CHIPSELECT_NUM		4
+
+/* The SFC can transfer max 16KB - 1 at one time
+ * we set it to 15.5KB here for alignment.
+ */
+#define SFC_MAX_TRANS_BYTES		(512 * 31)
+
+/* Maximum clock values from datasheet suggest keeping clock value under
+ * 150MHz. No minimum or average value is suggested, but the U-boot BSP driver
+ * has a minimum of 10MHz and a default of 80MHz which seems reasonable.
+ */
+#define SFC_MIN_SPEED_HZ		(10 * 1000 * 1000)
+#define SFC_DEFAULT_SPEED_HZ		(80 * 1000 * 1000)
+#define SFC_MAX_SPEED_HZ		(150 * 1000 * 1000)
+
+#define SFC_CMD_DUMMY(x) \
+	((x) << SFC_CMD_DUMMY_SHIFT)
+
+enum rockchip_sfc_iftype {
+	IF_TYPE_STD,
+	IF_TYPE_DUAL,
+	IF_TYPE_QUAD,
+};
+
+struct rockchip_sfc;
+struct rockchip_sfc_chip_priv {
+	u8 cs;
+	u32 clk_rate;
+	struct rockchip_sfc *sfc;
+};
+
+struct rockchip_sfc {
+	struct device *dev;
+	void __iomem *regbase;
+	struct clk *hclk;
+	struct clk *clk;
+	/* virtual mapped addr for dma_buffer */
+	void *buffer;
+	dma_addr_t dma_buffer;
+	struct completion cp;
+	struct rockchip_sfc_chip_priv flash[SFC_MAX_CHIPSELECT_NUM];
+	u8 num_chip;
+	bool use_dma;
+};
+
+static int rockchip_sfc_get_if_type(const struct spi_mem_op *op,
+				    struct rockchip_sfc *sfc)
+{
+	switch (op->data.buswidth) {
+	case 1:
+		return IF_TYPE_STD;
+	case 2:
+		return IF_TYPE_DUAL;
+	case 4:
+		return IF_TYPE_QUAD;
+	default:
+		dev_err(sfc->dev, "unsupported SPI read mode\n");
+		return -EINVAL;
+	}
+}
+
+static int rockchip_sfc_reset(struct rockchip_sfc *sfc)
+{
+	int err;
+	u32 status;
+
+	writel_relaxed(SFC_RCVR_RESET, sfc->regbase + SFC_RCVR);
+
+	err = readl_poll_timeout(sfc->regbase + SFC_RCVR, status,
+				 !(status & SFC_RCVR_RESET), 20,
+				 jiffies_to_usecs(HZ));
+	if (err)
+		dev_err(sfc->dev, "SFC reset never finished\n");
+
+	/* Still need to clear the masked interrupt from RISR */
+	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
+		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
+		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
+		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
+		       sfc->regbase + SFC_ICLR);
+
+	dev_dbg(sfc->dev, "reset\n");
+
+	return err;
+}
+
+static int rockchip_sfc_init(struct rockchip_sfc *sfc)
+{
+	int err;
+
+	err = clk_set_rate(sfc->clk, SFC_DEFAULT_SPEED_HZ);
+	if (err)
+		return err;
+
+	err = rockchip_sfc_reset(sfc);
+	if (err)
+		return err;
+
+	/* Mask all eight interrupts */
+	writel_relaxed(0xff, sfc->regbase + SFC_IMR);
+
+	writel_relaxed(SFC_CTRL_PHASE_SEL_NEGETIVE, sfc->regbase + SFC_CTRL);
+
+	return 0;
+}
+
+static inline int rockchip_sfc_get_fifo_level(struct rockchip_sfc *sfc, int wr)
+{
+	u32 fsr = readl_relaxed(sfc->regbase + SFC_FSR);
+	int level;
+
+	if (wr)
+		level = (fsr & SFC_FSR_TXLV_MASK) >> SFC_FSR_TXLV_SHIFT;
+	else
+		level = (fsr & SFC_FSR_RXLV_MASK) >> SFC_FSR_RXLV_SHIFT;
+
+	return level;
+}
+
+static int rockchip_sfc_wait_fifo_ready(struct rockchip_sfc *sfc, int wr, u32 timeout)
+{
+	unsigned long deadline = jiffies + timeout;
+	int level;
+
+	while (!(level = rockchip_sfc_get_fifo_level(sfc, wr))) {
+		if (time_after_eq(jiffies, deadline)) {
+			dev_warn(sfc->dev, "%s fifo timeout\n", wr ? "write" : "read");
+			return -ETIMEDOUT;
+		}
+		udelay(1);
+	}
+
+	return level;
+}
+
+/* The SFC_CTRL register is a global control register,
+ * when the controller is in busy state(SFC_SR),
+ * SFC_CTRL cannot be set.
+ */
+static void rockchip_sfc_wait_idle(struct rockchip_sfc *sfc, u32 timeout_us)
+{
+	u32 status;
+	int ret;
+
+	ret = readl_poll_timeout(sfc->regbase + SFC_SR, status,
+				 !(status & SFC_SR_IS_BUSY),
+				 20, timeout_us);
+	if (ret) {
+		dev_err(sfc->dev, "wait sfc idle timeout\n");
+		rockchip_sfc_reset(sfc);
+	}
+}
+
+static void rockchip_sfc_setup_ctrl(struct rockchip_sfc *sfc)
+{
+	u32 reg;
+
+	reg = IF_TYPE_STD << SFC_CTRL_DATA_BITS_SHIFT;
+	reg |= IF_TYPE_STD << SFC_CTRL_ADDR_BITS_SHIFT;
+	reg |= IF_TYPE_STD << SFC_CTRL_CMD_BITS_SHIFT;
+	reg |= SFC_CTRL_PHASE_SEL_NEGETIVE;
+
+	rockchip_sfc_wait_idle(sfc, 10000);
+
+	writel_relaxed(reg, sfc->regbase + SFC_CTRL);
+}
+
+static int rockchip_sfc_op_reg(struct rockchip_sfc_chip_priv *priv,
+			       u8 opcode, int len, u8 optype)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	u32 reg;
+
+	rockchip_sfc_setup_ctrl(sfc);
+
+	reg = opcode << SFC_CMD_IDX_SHIFT;
+	reg |= len << SFC_CMD_TRAN_BYTES_SHIFT;
+	reg |= priv->cs << SFC_CMD_CS_SHIFT;
+	reg |= optype << SFC_CMD_DIR_SHIFT;
+	writel_relaxed(reg, sfc->regbase + SFC_CMD);
+
+	return 0;
+}
+
+static int rockchip_sfc_write_fifo(struct rockchip_sfc *sfc, const u8 *buf, int len)
+{
+	u8 bytes = len & 0x3;
+	u32 dwords;
+	int tx_level;
+	u32 write_words;
+	u32 tmp = 0;
+
+	dwords = len >> 2;
+	while (dwords) {
+		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
+		if (tx_level < 0)
+			return tx_level;
+		write_words = min_t(u32, tx_level, dwords);
+		iowrite32_rep(sfc->regbase + SFC_DATA, buf, write_words);
+		buf += write_words << 2;
+		dwords -= write_words;
+	}
+
+	/* write the rest of the bytes that are not a multiple of word size */
+	if (bytes) {
+		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
+		if (tx_level < 0)
+			return tx_level;
+		memcpy(&tmp, buf, bytes);
+		writel_relaxed(tmp, sfc->regbase + SFC_DATA);
+	}
+
+	return len;
+}
+
+static int rockchip_sfc_read_fifo(struct rockchip_sfc *sfc, u8 *buf, int len)
+{
+	u8 bytes = len & 0x3;
+	u32 dwords;
+	u8 read_words;
+	int rx_level;
+	int tmp;
+
+	/* word aligned access only */
+	dwords = len >> 2;
+	while (dwords) {
+		rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
+		if (rx_level < 0)
+			return rx_level;
+		read_words = min_t(u32, rx_level, dwords);
+		ioread32_rep(sfc->regbase + SFC_DATA, buf, read_words);
+		buf += read_words << 2;
+		dwords -= read_words;
+	}
+
+	/* read the rest of the bytes that are not a multiple of word size */
+	if (bytes) {
+		rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
+		if (rx_level < 0)
+			return rx_level;
+		tmp = readl_relaxed(sfc->regbase + SFC_DATA);
+		memcpy(buf, &tmp, bytes);
+	}
+
+	return len;
+}
+
+static int rockchip_sfc_read_reg(struct rockchip_sfc_chip_priv *priv,
+				 const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	int ret;
+	int trans;
+	size_t n_rx = op->data.nbytes;
+	u8 opcode = op->cmd.opcode;
+	u8 *rxbuf = op->data.buf.in;
+
+	trans = min_t(int, n_rx, SFC_MAX_TRANS_BYTES);
+	ret = rockchip_sfc_op_reg(priv, opcode, trans, SFC_CMD_DIR_RD);
+	if (ret)
+		return ret;
+
+	ret = rockchip_sfc_read_fifo(sfc, rxbuf, trans);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int rockchip_sfc_write_reg(struct rockchip_sfc_chip_priv *priv,
+				  const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	int ret;
+	size_t n_tx = op->data.nbytes;
+	u8 opcode = op->cmd.opcode;
+	const u8 *txbuf = op->data.buf.out;
+
+	ret = rockchip_sfc_op_reg(priv, opcode, n_tx, SFC_CMD_DIR_WR);
+	if (ret)
+		return ret;
+	ret = rockchip_sfc_write_fifo(sfc, txbuf, n_tx);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int rockchip_sfc_setup_transfer(struct rockchip_sfc_chip_priv *priv,
+				       const struct spi_mem_op *op,
+				       loff_t from_to, size_t len, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	u8 if_type = IF_TYPE_STD;
+	u8 addr_width = op->addr.nbytes;
+	u8 read_dummy_bits = op->dummy.nbytes << 3;
+	u32 reg;
+
+	if (op_type == SFC_CMD_DIR_RD)
+		if_type = rockchip_sfc_get_if_type(op, sfc);
+
+	rockchip_sfc_wait_idle(sfc, 10000);
+
+	writel_relaxed((if_type << SFC_CTRL_DATA_BITS_SHIFT) |
+		       (IF_TYPE_STD << SFC_CTRL_ADDR_BITS_SHIFT) |
+		       (IF_TYPE_STD << SFC_CTRL_CMD_BITS_SHIFT) |
+		       SFC_CTRL_PHASE_SEL_NEGETIVE,
+		       sfc->regbase + SFC_CTRL);
+
+	reg = op->cmd.opcode << SFC_CMD_IDX_SHIFT;
+
+	reg |= op_type << SFC_CMD_DIR_SHIFT;
+	reg |= (addr_width == 4) ?
+		SFC_CMD_ADDR_32BITS : SFC_CMD_ADDR_24BITS;
+
+	reg |= priv->cs << SFC_CMD_CS_SHIFT;
+	reg |= len << SFC_CMD_TRAN_BYTES_SHIFT;
+
+	if (op_type == SFC_CMD_DIR_RD)
+		reg |= SFC_CMD_DUMMY(read_dummy_bits);
+
+	writel_relaxed(reg, sfc->regbase + SFC_CMD);
+	writel_relaxed(from_to, sfc->regbase + SFC_ADDR);
+
+	return 0;
+}
+
+static int rockchip_sfc_do_dma_transfer(struct rockchip_sfc_chip_priv *priv,
+					const struct spi_mem_op *op, loff_t from_to,
+					dma_addr_t dma_buf, size_t len, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	u32 reg;
+	int err = 0;
+
+	init_completion(&sfc->cp);
+
+	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
+		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
+		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
+		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
+		       sfc->regbase + SFC_ICLR);
+
+	/* Enable transfer complete interrupt */
+	reg = readl_relaxed(sfc->regbase + SFC_IMR);
+	reg &= ~SFC_IMR_TRAN_FINISH;
+	writel_relaxed(reg, sfc->regbase + SFC_IMR);
+
+	err = rockchip_sfc_setup_transfer(priv, op, from_to, len, op_type);
+	if (err < 0)
+		return err;
+
+	writel_relaxed(dma_buf, sfc->regbase + SFC_DMA_ADDR);
+
+	/*
+	 * Start dma but note that the sfc->dma_buffer is derived from
+	 * dmam_alloc_coherent so we don't actually need any sync operations
+	 * for coherent dma memory.
+	 */
+	writel(0x1, sfc->regbase + SFC_DMA_TRIGGER);
+
+	/* Wait for the interrupt. */
+	if (!wait_for_completion_timeout(&sfc->cp, msecs_to_jiffies(2000))) {
+		dev_err(sfc->dev, "DMA wait for transfer finish timeout\n");
+		err = -ETIMEDOUT;
+	}
+
+	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
+		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
+		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
+		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
+		       sfc->regbase + SFC_ICLR);
+	/* Disable transfer finish interrupt */
+	reg = readl_relaxed(sfc->regbase + SFC_IMR);
+	reg |= SFC_IMR_TRAN_FINISH;
+	writel_relaxed(reg, sfc->regbase + SFC_IMR);
+
+	if (err) {
+		rockchip_sfc_reset(sfc);
+		return err;
+	}
+
+	return 0;
+}
+
+static inline int rockchip_sfc_pio_write(struct rockchip_sfc *sfc, u_char *buf,
+					 size_t len)
+{
+	return rockchip_sfc_write_fifo(sfc, buf, len);
+}
+
+static inline int rockchip_sfc_pio_read(struct rockchip_sfc *sfc, u_char *buf,
+					size_t len)
+{
+	return rockchip_sfc_read_fifo(sfc, buf, len);
+}
+
+static int rockchip_sfc_pio_transfer(struct rockchip_sfc_chip_priv *priv,
+				     const struct spi_mem_op *op, loff_t from_to, size_t len,
+				     u_char *buf, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	size_t trans;
+	int ret;
+
+	trans = min_t(size_t, SFC_MAX_TRANS_BYTES, len);
+	ret = rockchip_sfc_setup_transfer(priv, op, from_to, trans, op_type);
+	if (ret < 0)
+		return ret;
+
+	if (op_type == SFC_CMD_DIR_WR)
+		ret = rockchip_sfc_pio_write(sfc, buf, trans);
+	else
+		ret = rockchip_sfc_pio_read(sfc, buf, trans);
+
+	return ret;
+}
+
+static int rockchip_sfc_dma_transfer(struct rockchip_sfc_chip_priv *priv,
+				     const struct spi_mem_op *op, loff_t from_to, size_t len,
+				     u_char *buf, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	size_t trans;
+	int ret;
+
+	trans = min_t(size_t, SFC_MAX_TRANS_BYTES, len);
+
+	if (op_type == SFC_CMD_DIR_WR)
+		memcpy(sfc->buffer, buf, trans);
+
+	ret = rockchip_sfc_do_dma_transfer(priv, op, from_to, sfc->dma_buffer,
+					   trans, op_type);
+	if (ret) {
+		dev_warn(sfc->dev, "DMA timeout\n");
+		return ret;
+	}
+
+	if (op_type == SFC_CMD_DIR_RD)
+		memcpy(buf, sfc->buffer, trans);
+
+	return trans;
+}
+
+static ssize_t rockchip_sfc_do_rd_wr(struct rockchip_sfc_chip_priv *priv,
+				     const struct spi_mem_op *op, loff_t from_to, size_t len,
+				     u_char *buf, u32 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+
+	/* DMA can only handle word aligned transfer chunks */
+	if (likely(sfc->use_dma) && !(len & 0x3))
+		return rockchip_sfc_dma_transfer(priv, op, from_to, len, buf, op_type);
+	else
+		return rockchip_sfc_pio_transfer(priv, op, from_to, len, buf, op_type);
+}
+
+static ssize_t rockchip_sfc_read(struct rockchip_sfc_chip_priv *priv,
+				 const struct spi_mem_op *op)
+{
+	loff_t from = op->addr.val;
+	size_t len = op->data.nbytes;
+	u_char *read_buf = op->data.buf.in;
+
+	return rockchip_sfc_do_rd_wr(priv, op, from, len, read_buf, SFC_CMD_DIR_RD);
+}
+
+static ssize_t rockchip_sfc_write(struct rockchip_sfc_chip_priv *priv,
+				  const struct spi_mem_op *op)
+{
+	loff_t to = op->addr.val;
+	size_t len = op->data.nbytes;
+	const u_char *write_buf = op->data.buf.out;
+
+	return rockchip_sfc_do_rd_wr(priv, op, to, len, (u_char *)write_buf, SFC_CMD_DIR_WR);
+}
+
+static int rockchip_sfc_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+	struct rockchip_sfc_chip_priv *priv = &sfc->flash[mem->spi->chip_select];
+
+	if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) {
+		if (!op->addr.nbytes)
+			return rockchip_sfc_read_reg(priv, op);
+
+		return rockchip_sfc_read(priv, op);
+	}
+
+	if (!op->addr.nbytes || !op->data.buf.out)
+		return rockchip_sfc_write_reg(priv, op);
+
+	return rockchip_sfc_write(priv, op);
+}
+
+static int rockchip_sfc_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+	struct rockchip_sfc_chip_priv *priv = &sfc->flash[mem->spi->chip_select];
+	int ret;
+
+	ret = clk_set_rate(sfc->clk, priv->clk_rate);
+	if (ret)
+		return ret;
+
+	ret = rockchip_sfc_mem_process(mem, op);
+	if (ret < 0) {
+		dev_err(&mem->spi->dev, "operation failed with %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const char *rockchip_sfc_get_name(struct spi_mem *mem)
+{
+	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+	struct device *dev = sfc->dev;
+
+	return devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev), mem->spi->chip_select);
+}
+
+static const struct spi_controller_mem_ops rockchip_sfc_mem_ops = {
+	.exec_op = rockchip_sfc_exec_mem_op,
+	.get_name = rockchip_sfc_get_name,
+};
+
+static int rockchip_sfc_register(struct device_node *np,
+				 struct rockchip_sfc *sfc)
+{
+	struct device *dev = sfc->dev;
+	int ret;
+
+	ret = of_property_read_u8(np, "reg", &sfc->flash[sfc->num_chip].cs);
+	if (ret) {
+		dev_err(dev, "No reg property for %s\n",
+			np->full_name);
+		return ret;
+	}
+
+	ret = of_property_read_u32(np, "spi-max-frequency",
+				   &sfc->flash[sfc->num_chip].clk_rate);
+	if (ret) {
+		dev_err(dev, "No spi-max-frequency property for %s\n",
+			np->full_name);
+		return ret;
+	}
+
+	sfc->flash[sfc->num_chip].sfc = sfc;
+	sfc->num_chip++;
+	return 0;
+}
+
+static int rockchip_sfc_register_all(struct rockchip_sfc *sfc)
+{
+	struct device *dev = sfc->dev;
+	struct device_node *np;
+	int ret;
+
+	for_each_available_child_of_node(dev->of_node, np) {
+		ret = rockchip_sfc_register(np, sfc);
+		if (ret)
+			dev_err(dev, "Failed to register all chips\n");
+			return ret;
+
+		if (sfc->num_chip >= SFC_MAX_CHIPSELECT_NUM) {
+			dev_warn(dev, "Exceeds the max cs limitation\n");
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static irqreturn_t rockchip_sfc_irq_handler(int irq, void *dev_id)
+{
+	struct rockchip_sfc *sfc = dev_id;
+	u32 reg;
+
+	reg = readl(sfc->regbase + SFC_RISR);
+
+	/* Clear interrupt if transfer is finished */
+	if (reg & SFC_RISR_TRAN_FINISH) {
+		writel_relaxed(reg, sfc->regbase + SFC_ICLR);
+		complete(&sfc->cp);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static int rockchip_sfc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct spi_master *master;
+	struct resource *res;
+	struct rockchip_sfc *sfc;
+	int ret;
+
+	master = spi_alloc_master(&pdev->dev, sizeof(*sfc));
+	if (!master) {
+		dev_err(&pdev->dev, "spi_alloc_master failed\n");
+		return -ENOMEM;
+	}
+
+	master->mem_ops = &rockchip_sfc_mem_ops;
+	master->dev.of_node = pdev->dev.of_node;
+	master->mode_bits = SPI_RX_QUAD | SPI_RX_DUAL;
+	master->min_speed_hz = SFC_MIN_SPEED_HZ;
+	master->max_speed_hz = SFC_MAX_SPEED_HZ;
+
+	sfc = spi_master_get_devdata(master);
+	sfc->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	sfc->regbase = devm_ioremap_resource(dev, res);
+	if (IS_ERR(sfc->regbase))
+		return PTR_ERR(sfc->regbase);
+
+	sfc->clk = devm_clk_get(&pdev->dev, "sfc");
+	if (IS_ERR(sfc->clk)) {
+		dev_err(&pdev->dev, "Failed to get sfc interface clk\n");
+		return PTR_ERR(sfc->clk);
+	}
+
+	sfc->hclk = devm_clk_get(&pdev->dev, "ahb");
+	if (IS_ERR(sfc->hclk)) {
+		dev_err(&pdev->dev, "Failed to get sfc ahb clk\n");
+		return PTR_ERR(sfc->hclk);
+	}
+
+	sfc->use_dma = !of_property_read_bool(sfc->dev->of_node,
+					      "rockchip,sfc-no-dma");
+
+	if (sfc->use_dma) {
+		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_warn(dev, "Unable to set dma mask\n");
+			return ret;
+		}
+
+		sfc->buffer = dmam_alloc_coherent(dev, SFC_MAX_TRANS_BYTES,
+						  &sfc->dma_buffer,
+						  GFP_KERNEL);
+		if (!sfc->buffer)
+			return -ENOMEM;
+	}
+
+	ret = clk_prepare_enable(sfc->hclk);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable ahb clk\n");
+		goto err_hclk;
+	}
+
+	ret = clk_prepare_enable(sfc->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable interface clk\n");
+		goto err_clk;
+	}
+
+	/* Find the irq */
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0) {
+		dev_err(dev, "Failed to get the irq\n");
+		goto err_irq;
+	}
+
+	ret = devm_request_irq(dev, ret, rockchip_sfc_irq_handler,
+			       0, pdev->name, sfc);
+	if (ret) {
+		dev_err(dev, "Failed to request irq\n");
+		goto err_irq;
+	}
+
+	sfc->num_chip = 0;
+	ret = rockchip_sfc_init(sfc);
+	if (ret)
+		goto err_irq;
+
+	ret = rockchip_sfc_register_all(sfc);
+	if (ret)
+		goto err_irq;
+
+	ret = devm_spi_register_master(dev, master);
+	if (ret)
+		goto err_irq;
+
+	return 0;
+
+err_irq:
+	clk_disable_unprepare(sfc->clk);
+err_clk:
+	clk_disable_unprepare(sfc->hclk);
+err_hclk:
+	return ret;
+}
+
+static int rockchip_sfc_remove(struct platform_device *pdev)
+{
+	struct rockchip_sfc *sfc = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(sfc->clk);
+	clk_disable_unprepare(sfc->hclk);
+	return 0;
+}
+
+static const struct of_device_id rockchip_sfc_dt_ids[] = {
+	{ .compatible = "rockchip,rk3036-sfc"},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rockchip_sfc_dt_ids);
+
+static struct platform_driver rockchip_sfc_driver = {
+	.driver = {
+		.name	= "rockchip-sfc",
+		.of_match_table = rockchip_sfc_dt_ids,
+	},
+	.probe	= rockchip_sfc_probe,
+	.remove	= rockchip_sfc_remove,
+};
+module_platform_driver(rockchip_sfc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Rockchip Serial Flash Controller Driver");
+MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>");
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH v5 3/8] arm64: dts: rockchip: Add SFC to PX30
  2021-06-07 12:42 [PATCH v5 0/8] Add Rockchip SFC(serial flash controller) support Jon Lin
  2021-06-07 12:42 ` [PATCH v5 1/8] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller Jon Lin
  2021-06-07 12:42 ` [PATCH v5 2/8] spi: rockchip-sfc: add rockchip " Jon Lin
@ 2021-06-07 12:42 ` Jon Lin
  2021-06-07 12:42 ` [PATCH v5 4/8] clk: rockchip: Add support for hclk_sfc on rk3036 Jon Lin
  2021-06-07 12:44 ` [PATCH v5 5/8] arm: dts: rockchip: Add SFC to RK3036 Jon Lin
  4 siblings, 0 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:42 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

Add a devicetree entry for the Rockchip SFC for the PX30 SOC.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 arch/arm64/boot/dts/rockchip/px30.dtsi | 38 ++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/px30.dtsi b/arch/arm64/boot/dts/rockchip/px30.dtsi
index 09baa8a167ce..cc7aced2dde9 100644
--- a/arch/arm64/boot/dts/rockchip/px30.dtsi
+++ b/arch/arm64/boot/dts/rockchip/px30.dtsi
@@ -966,6 +966,18 @@
 		status = "disabled";
 	};
 
+	sfc: spi@ff3a0000 {
+		compatible = "rockchip,px30-sfc","rockchip,rk3036-sfc";
+		reg = <0x0 0xff3a0000 0x0 0x4000>;
+		interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru HCLK_SFC>, <&cru SCLK_SFC>;
+		clock-names = "ahb", "sfc";
+		pinctrl-0 = <&sfc_clk &sfc_cs0 &sfc_bus4>;
+		pinctrl-names = "default";
+		power-domains = <&power PX30_PD_MMC_NAND>;
+		status = "disabled";
+	};
+
 	nfc: nand-controller@ff3b0000 {
 		compatible = "rockchip,px30-nfc";
 		reg = <0x0 0xff3b0000 0x0 0x4000>;
@@ -1967,6 +1979,32 @@
 			};
 		};
 
+		serial_flash {
+			sfc_bus4: sfc-bus4 {
+				rockchip,pins =
+					<1 RK_PA0 3 &pcfg_pull_none>,
+					<1 RK_PA1 3 &pcfg_pull_none>,
+					<1 RK_PA2 3 &pcfg_pull_none>,
+					<1 RK_PA3 3 &pcfg_pull_none>;
+			};
+
+			sfc_bus2: sfc-bus2 {
+				rockchip,pins =
+					<1 RK_PA0 3 &pcfg_pull_none>,
+					<1 RK_PA1 3 &pcfg_pull_none>;
+			};
+
+			sfc_cs0: sfc-cs0 {
+				rockchip,pins =
+					<1 RK_PA4 3 &pcfg_pull_none>;
+			};
+
+			sfc_clk: sfc-clk {
+				rockchip,pins =
+					<1 RK_PB1 3 &pcfg_pull_none>;
+			};
+		};
+
 		lcdc {
 			lcdc_rgb_dclk_pin: lcdc-rgb-dclk-pin {
 				rockchip,pins =
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH v5 4/8] clk: rockchip: Add support for hclk_sfc on rk3036
  2021-06-07 12:42 [PATCH v5 0/8] Add Rockchip SFC(serial flash controller) support Jon Lin
                   ` (2 preceding siblings ...)
  2021-06-07 12:42 ` [PATCH v5 3/8] arm64: dts: rockchip: Add SFC to PX30 Jon Lin
@ 2021-06-07 12:42 ` Jon Lin
  2021-06-07 12:44 ` [PATCH v5 5/8] arm: dts: rockchip: Add SFC to RK3036 Jon Lin
  4 siblings, 0 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:42 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

Add support for the bus clock for the serial flash controller on the
rk3036. Taken from the Rockchip BSP kernel but not tested on real
hardware (as I lack a 3036 based SoC to test).

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 drivers/clk/rockchip/clk-rk3036.c      | 2 +-
 include/dt-bindings/clock/rk3036-cru.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/rockchip/clk-rk3036.c b/drivers/clk/rockchip/clk-rk3036.c
index 91d56ad45817..ebb628733f6d 100644
--- a/drivers/clk/rockchip/clk-rk3036.c
+++ b/drivers/clk/rockchip/clk-rk3036.c
@@ -403,7 +403,7 @@ static struct rockchip_clk_branch rk3036_clk_branches[] __initdata = {
 	GATE(HCLK_OTG0, "hclk_otg0", "hclk_peri", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(5), 13, GFLAGS),
 	GATE(HCLK_OTG1, "hclk_otg1", "hclk_peri", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(7), 3, GFLAGS),
 	GATE(HCLK_I2S, "hclk_i2s", "hclk_peri", 0, RK2928_CLKGATE_CON(7), 2, GFLAGS),
-	GATE(0, "hclk_sfc", "hclk_peri", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(3), 14, GFLAGS),
+	GATE(HCLK_SFC, "hclk_sfc", "hclk_peri", CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(3), 14, GFLAGS),
 	GATE(HCLK_MAC, "hclk_mac", "hclk_peri", 0, RK2928_CLKGATE_CON(3), 5, GFLAGS),
 
 	/* pclk_peri gates */
diff --git a/include/dt-bindings/clock/rk3036-cru.h b/include/dt-bindings/clock/rk3036-cru.h
index 35a5a01f9697..a96a9870ad59 100644
--- a/include/dt-bindings/clock/rk3036-cru.h
+++ b/include/dt-bindings/clock/rk3036-cru.h
@@ -81,6 +81,7 @@
 #define HCLK_OTG0		449
 #define HCLK_OTG1		450
 #define HCLK_NANDC		453
+#define HCLK_SFC		454
 #define HCLK_SDMMC		456
 #define HCLK_SDIO		457
 #define HCLK_EMMC		459
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH v5 5/8] arm: dts: rockchip: Add SFC to RK3036
  2021-06-07 12:42 [PATCH v5 0/8] Add Rockchip SFC(serial flash controller) support Jon Lin
                   ` (3 preceding siblings ...)
  2021-06-07 12:42 ` [PATCH v5 4/8] clk: rockchip: Add support for hclk_sfc on rk3036 Jon Lin
@ 2021-06-07 12:44 ` Jon Lin
  2021-06-07 12:44   ` [PATCH v5 6/8] arm: dts: rockchip: Add SFC to RV1108 Jon Lin
                     ` (2 more replies)
  4 siblings, 3 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:44 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

Add a devicetree entry for the Rockchip SFC for the RK3036 SOC.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 arch/arm/boot/dts/rk3036.dtsi | 42 +++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/arch/arm/boot/dts/rk3036.dtsi b/arch/arm/boot/dts/rk3036.dtsi
index e24230d50a78..0dba2956dfb8 100644
--- a/arch/arm/boot/dts/rk3036.dtsi
+++ b/arch/arm/boot/dts/rk3036.dtsi
@@ -206,6 +206,17 @@
 		status = "disabled";
 	};
 
+	sfc: spi@10208000 {
+		compatible = "rockchip,rk3036-sfc";
+		reg = <0x10208000 0x4000>;
+		interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru HCLK_SFC>, <&cru SCLK_SFC>;
+		clock-names = "ahb", "sfc";
+		pinctrl-0 = <&sfc_clk &sfc_cs0 &sfc_bus4>;
+		pinctrl-names = "default";
+		status = "disabled";
+	};
+
 	sdmmc: mmc@10214000 {
 		compatible = "rockchip,rk3036-dw-mshc", "rockchip,rk3288-dw-mshc";
 		reg = <0x10214000 0x4000>;
@@ -684,6 +695,37 @@
 			};
 		};
 
+		serial_flash {
+			sfc_bus4: sfc-bus4 {
+				rockchip,pins =
+					<1 RK_PD0 3 &pcfg_pull_none>,
+					<1 RK_PD1 3 &pcfg_pull_none>,
+					<1 RK_PD2 3 &pcfg_pull_none>,
+					<1 RK_PD3 3 &pcfg_pull_none>;
+			};
+
+			sfc_bus2: sfc-bus2 {
+				rockchip,pins =
+					<1 RK_PD0 3 &pcfg_pull_none>,
+					<1 RK_PD1 3 &pcfg_pull_none>;
+			};
+
+			sfc_cs0: sfc-cs0 {
+				rockchip,pins =
+					<2 RK_PA2 3 &pcfg_pull_none>;
+			};
+
+			sfc_cs1: sfc-cs1 {
+				rockchip,pins =
+					<2 RK_PA3 3 &pcfg_pull_none>;
+			};
+
+			sfc_clk: sfc-clk {
+				rockchip,pins =
+					<2 RK_PA4 3 &pcfg_pull_none>;
+			};
+		};
+
 		emac {
 			emac_xfer: emac-xfer {
 				rockchip,pins = <2 RK_PB2 1 &pcfg_pull_default>, /* crs_dvalid */
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH v5 6/8] arm: dts: rockchip: Add SFC to RV1108
  2021-06-07 12:44 ` [PATCH v5 5/8] arm: dts: rockchip: Add SFC to RK3036 Jon Lin
@ 2021-06-07 12:44   ` Jon Lin
  2021-06-07 12:44   ` [PATCH v5 7/8] arm64: dts: rockchip: Add SFC to RK3308 Jon Lin
  2021-06-07 12:44   ` [PATCH v5 8/8] arm64: dts: rockchip: Enable SFC for Odroid Go Advance Jon Lin
  2 siblings, 0 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:44 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

Add a devicetree entry for the Rockchip SFC for the RV1108 SOC.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 arch/arm/boot/dts/rv1108.dtsi | 37 +++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm/boot/dts/rv1108.dtsi b/arch/arm/boot/dts/rv1108.dtsi
index 884872ca5207..c0d95e13add4 100644
--- a/arch/arm/boot/dts/rv1108.dtsi
+++ b/arch/arm/boot/dts/rv1108.dtsi
@@ -536,6 +536,17 @@
 		status = "disabled";
 	};
 
+	sfc: spi@301c0000 {
+		compatible = "rockchip,rv1108-sfc", "rockchip,rk3036-sfc";
+		reg = <0x301c0000 0x4000>;
+		interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru HCLK_SFC>, <&cru SCLK_SFC>;
+		clock-names = "ahb", "sfc";
+		pinctrl-0 = <&sfc_clk &sfc_cs0 &sfc_bus4>;
+		pinctrl-names = "default";
+		status = "disabled";
+	};
+
 	gmac: eth@30200000 {
 		compatible = "rockchip,rv1108-gmac";
 		reg = <0x30200000 0x10000>;
@@ -704,6 +715,32 @@
 			};
 		};
 
+		serial_flash {
+			sfc_bus4: sfc-bus4 {
+				rockchip,pins =
+					<2 RK_PA0 3 &pcfg_pull_none>,
+					<2 RK_PA1 3 &pcfg_pull_none>,
+					<2 RK_PA2 3 &pcfg_pull_none>,
+					<2 RK_PA3 3 &pcfg_pull_none>;
+			};
+
+			sfc_bus2: sfc-bus2 {
+				rockchip,pins =
+					<2 RK_PA0 3 &pcfg_pull_none>,
+					<2 RK_PA1 3 &pcfg_pull_none>;
+			};
+
+			sfc_cs0: sfc-cs0 {
+				rockchip,pins =
+					<2 RK_PB4 3 &pcfg_pull_none>;
+			};
+
+			sfc_clk: sfc-clk {
+				rockchip,pins =
+					<2 RK_PB7 2 &pcfg_pull_none>;
+			};
+		};
+
 		gmac {
 			rmii_pins: rmii-pins {
 				rockchip,pins =	<1 RK_PC5 2 &pcfg_pull_none>,
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH v5 7/8] arm64: dts: rockchip: Add SFC to RK3308
  2021-06-07 12:44 ` [PATCH v5 5/8] arm: dts: rockchip: Add SFC to RK3036 Jon Lin
  2021-06-07 12:44   ` [PATCH v5 6/8] arm: dts: rockchip: Add SFC to RV1108 Jon Lin
@ 2021-06-07 12:44   ` Jon Lin
  2021-06-07 12:44   ` [PATCH v5 8/8] arm64: dts: rockchip: Enable SFC for Odroid Go Advance Jon Lin
  2 siblings, 0 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:44 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

Add a devicetree entry for the Rockchip SFC for the RK3308 SOC.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 arch/arm64/boot/dts/rockchip/rk3308.dtsi | 37 ++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3308.dtsi b/arch/arm64/boot/dts/rockchip/rk3308.dtsi
index 0c5fa9801e6f..2d922b1d51d5 100644
--- a/arch/arm64/boot/dts/rockchip/rk3308.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3308.dtsi
@@ -637,6 +637,17 @@
 		status = "disabled";
 	};
 
+	sfc: spi@ff4c0000 {
+		compatible = "rockchip,rk3308-sfc", "rockchip,rk3036-sfc";
+		reg = <0x0 0xff4c0000 0x0 0x4000>;
+		interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru HCLK_SFC>, <&cru SCLK_SFC>;
+		clock-names = "ahb", "sfc";
+		pinctrl-0 = <&sfc_clk &sfc_cs0 &sfc_bus4>;
+		pinctrl-names = "default";
+		status = "disabled";
+	};
+
 	cru: clock-controller@ff500000 {
 		compatible = "rockchip,rk3308-cru";
 		reg = <0x0 0xff500000 0x0 0x1000>;
@@ -910,6 +921,32 @@
 			};
 		};
 
+		serial_flash {
+			sfc_bus4: sfc-bus4 {
+				rockchip,pins =
+					<3 RK_PA0 3 &pcfg_pull_none>,
+					<3 RK_PA1 3 &pcfg_pull_none>,
+					<3 RK_PA2 3 &pcfg_pull_none>,
+					<3 RK_PA3 3 &pcfg_pull_none>;
+			};
+
+			sfc_bus2: sfc-bus2 {
+				rockchip,pins =
+					<3 RK_PA0 3 &pcfg_pull_none>,
+					<3 RK_PA1 3 &pcfg_pull_none>;
+			};
+
+			sfc_cs0: sfc-cs0 {
+				rockchip,pins =
+					<3 RK_PA4 3 &pcfg_pull_none>;
+			};
+
+			sfc_clk: sfc-clk {
+				rockchip,pins =
+					<3 RK_PA5 3 &pcfg_pull_none>;
+			};
+		};
+
 		gmac {
 			rmii_pins: rmii-pins {
 				rockchip,pins =
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH v5 8/8] arm64: dts: rockchip: Enable SFC for Odroid Go Advance
  2021-06-07 12:44 ` [PATCH v5 5/8] arm: dts: rockchip: Add SFC to RK3036 Jon Lin
  2021-06-07 12:44   ` [PATCH v5 6/8] arm: dts: rockchip: Add SFC to RV1108 Jon Lin
  2021-06-07 12:44   ` [PATCH v5 7/8] arm64: dts: rockchip: Add SFC to RK3308 Jon Lin
@ 2021-06-07 12:44   ` Jon Lin
  2 siblings, 0 replies; 10+ messages in thread
From: Jon Lin @ 2021-06-07 12:44 UTC (permalink / raw)
  To: linux-spi
  Cc: jon.lin, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, macroalpha82,
	devicetree, linux-arm-kernel, linux-kernel, Chris Morgan

From: Chris Morgan <macromorgan@hotmail.com>

This enables the Rockchip Serial Flash Controller for the Odroid Go
Advance. Note that while the attached SPI NOR flash and the controller
both support quad read mode, only 2 of the required 4 pins are present.
The rx and tx bus width is set to 2 for this reason.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

 .../boot/dts/rockchip/rk3326-odroid-go2.dts      | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
index 49c97f76df77..f78e11dd8447 100644
--- a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
@@ -484,6 +484,22 @@
 	status = "okay";
 };
 
+&sfc {
+	pinctrl-0 = <&sfc_clk &sfc_cs0 &sfc_bus2>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <108000000>;
+		spi-rx-bus-width = <2>;
+		spi-tx-bus-width = <2>;
+	};
+};
+
 &tsadc {
 	status = "okay";
 };
-- 
2.17.1




^ permalink raw reply related	[flat|nested] 10+ messages in thread

* Re: [PATCH v5 2/8] spi: rockchip-sfc: add rockchip serial flash controller
  2021-06-07 12:42 ` [PATCH v5 2/8] spi: rockchip-sfc: add rockchip " Jon Lin
@ 2021-06-07 15:28   ` Chris Morgan
  0 siblings, 0 replies; 10+ messages in thread
From: Chris Morgan @ 2021-06-07 15:28 UTC (permalink / raw)
  To: Jon Lin
  Cc: linux-spi, broonie, robh+dt, heiko, jbx6244, hjc, yifeng.zhao,
	sugar.zhang, linux-rockchip, linux-mtd, p.yadav, devicetree,
	linux-arm-kernel, linux-kernel, Chris Morgan

On Mon, Jun 07, 2021 at 08:42:57PM +0800, Jon Lin wrote:
> From: Chris Morgan <macromorgan@hotmail.com>
> 
> Add the rockchip serial flash controller (SFC) driver.
> 
> Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
> Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
> ---

Lukas Wunner provided me some comments on my last patch series
which I am including in here to make sure they get seen.

Thank you.

> 
> Changes in v5: None
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
> Changes in v1: None
> 
>  drivers/spi/Kconfig            |   9 +
>  drivers/spi/Makefile           |   1 +
>  drivers/spi/spi-rockchip-sfc.c | 863 +++++++++++++++++++++++++++++++++
>  3 files changed, 873 insertions(+)
>  create mode 100644 drivers/spi/spi-rockchip-sfc.c
> 
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index e71a4c514f7b..d89e5f3c9107 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -658,6 +658,15 @@ config SPI_ROCKCHIP
>  	  The main usecase of this controller is to use spi flash as boot
>  	  device.
>  
> +config SPI_ROCKCHIP_SFC
> +	tristate "Rockchip Serial Flash Controller (SFC)"
> +	depends on ARCH_ROCKCHIP || COMPILE_TEST
> +	depends on HAS_IOMEM && HAS_DMA
> +	help
> +	  This enables support for Rockchip serial flash controller. This
> +	  is a specialized controller used to access SPI flash on some
> +	  Rockchip SOCs.
> +
>  config SPI_RB4XX
>  	tristate "Mikrotik RB4XX SPI master"
>  	depends on SPI_MASTER && ATH79
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 13e54c45e9df..699db95c8441 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -95,6 +95,7 @@ obj-$(CONFIG_SPI_QCOM_GENI)		+= spi-geni-qcom.o
>  obj-$(CONFIG_SPI_QCOM_QSPI)		+= spi-qcom-qspi.o
>  obj-$(CONFIG_SPI_QUP)			+= spi-qup.o
>  obj-$(CONFIG_SPI_ROCKCHIP)		+= spi-rockchip.o
> +obj-$(CONFIG_SPI_ROCKCHIP_SFC)		+= spi-rockchip-sfc.o
>  obj-$(CONFIG_SPI_RB4XX)			+= spi-rb4xx.o
>  obj-$(CONFIG_MACH_REALTEK_RTL)		+= spi-realtek-rtl.o
>  obj-$(CONFIG_SPI_RPCIF)			+= spi-rpc-if.o
> diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c
> new file mode 100644
> index 000000000000..ddce87a2f319
> --- /dev/null
> +++ b/drivers/spi/spi-rockchip-sfc.c
> @@ -0,0 +1,863 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// Rockchip Serial Flash Controller Driver
> +//
> +// Copyright (c) 2017, Rockchip Inc.

Should we change this to you?

> +// Author: Shawn Lin <shawn.lin@rock-chips.com>
> +//
> +
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/iopoll.h>
> +#include <linux/mm.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/spi/spi-mem.h>
> +
> +/* System control */
> +#define SFC_CTRL			0x0
> +#define  SFC_CTRL_COMMON_BITS_1		0x0
> +#define  SFC_CTRL_COMMON_BITS_2		0x1
> +#define  SFC_CTRL_COMMON_BITS_4		0x2
> +#define  SFC_CTRL_DATA_BITS_SHIFT	12
> +#define  SFC_CTRL_ADDR_BITS_SHIFT	10
> +#define  SFC_CTRL_CMD_BITS_SHIFT	8
> +#define  SFC_CTRL_PHASE_SEL_NEGETIVE	BIT(1)
> +
> +/* Interrupt mask */
> +#define SFC_IMR				0x4
> +#define  SFC_IMR_RX_FULL		BIT(0)
> +#define  SFC_IMR_RX_UFLOW		BIT(1)
> +#define  SFC_IMR_TX_OFLOW		BIT(2)
> +#define  SFC_IMR_TX_EMPTY		BIT(3)
> +#define  SFC_IMR_TRAN_FINISH		BIT(4)
> +#define  SFC_IMR_BUS_ERR		BIT(5)
> +#define  SFC_IMR_NSPI_ERR		BIT(6)
> +#define  SFC_IMR_DMA			BIT(7)
> +
> +/* Interrupt clear */
> +#define SFC_ICLR			0x8
> +#define  SFC_ICLR_RX_FULL		BIT(0)
> +#define  SFC_ICLR_RX_UFLOW		BIT(1)
> +#define  SFC_ICLR_TX_OFLOW		BIT(2)
> +#define  SFC_ICLR_TX_EMPTY		BIT(3)
> +#define  SFC_ICLR_TRAN_FINISH		BIT(4)
> +#define  SFC_ICLR_BUS_ERR		BIT(5)
> +#define  SFC_ICLR_NSPI_ERR		BIT(6)
> +#define  SFC_ICLR_DMA			BIT(7)
> +
> +/* FIFO threshold level */
> +#define SFC_FTLR			0xc
> +#define  SFC_FTLR_TX_SHIFT		0
> +#define  SFC_FTLR_TX_MASK		0x1f
> +#define  SFC_FTLR_RX_SHIFT		8
> +#define  SFC_FTLR_RX_MASK		0x1f
> +
> +/* Reset FSM and FIFO */
> +#define SFC_RCVR			0x10
> +#define  SFC_RCVR_RESET			BIT(0)
> +
> +/* Enhanced mode */
> +#define SFC_AX				0x14
> +
> +/* Address Bit number */
> +#define SFC_ABIT			0x18
> +
> +/* Interrupt status */
> +#define SFC_ISR				0x1c
> +#define  SFC_ISR_RX_FULL_SHIFT		BIT(0)
> +#define  SFC_ISR_RX_UFLOW_SHIFT		BIT(1)
> +#define  SFC_ISR_TX_OFLOW_SHIFT		BIT(2)
> +#define  SFC_ISR_TX_EMPTY_SHIFT		BIT(3)
> +#define  SFC_ISR_TX_FINISH_SHIFT	BIT(4)
> +#define  SFC_ISR_BUS_ERR_SHIFT		BIT(5)
> +#define  SFC_ISR_NSPI_ERR_SHIFT		BIT(6)
> +#define  SFC_ISR_DMA_SHIFT		BIT(7)
> +
> +/* FIFO status */
> +#define SFC_FSR				0x20
> +#define  SFC_FSR_TX_IS_FULL		BIT(0)
> +#define  SFC_FSR_TX_IS_EMPTY		BIT(1)
> +#define  SFC_FSR_RX_IS_EMPTY		BIT(2)
> +#define  SFC_FSR_RX_IS_FULL		BIT(3)
> +#define  SFC_FSR_TXLV_MASK		GENMASK(12, 8)
> +#define  SFC_FSR_TXLV_SHIFT		8
> +#define  SFC_FSR_RXLV_MASK		GENMASK(20, 16)
> +#define  SFC_FSR_RXLV_SHIFT		16
> +
> +/* FSM status */
> +#define SFC_SR				0x24
> +#define  SFC_SR_IS_IDLE			0x0
> +#define  SFC_SR_IS_BUSY			0x1
> +
> +/* Raw interrupt status */
> +#define SFC_RISR			0x28
> +#define  SFC_RISR_RX_FULL		BIT(0)
> +#define  SFC_RISR_RX_UNDERFLOW		BIT(1)
> +#define  SFC_RISR_TX_OVERFLOW		BIT(2)
> +#define  SFC_RISR_TX_EMPTY		BIT(3)
> +#define  SFC_RISR_TRAN_FINISH		BIT(4)
> +#define  SFC_RISR_BUS_ERR		BIT(5)
> +#define  SFC_RISR_NSPI_ERR		BIT(6)
> +#define  SFC_RISR_DMA			BIT(7)
> +
> +/* Master trigger */
> +#define SFC_DMA_TRIGGER			0x80
> +
> +/* Src or Dst addr for master */
> +#define SFC_DMA_ADDR			0x84
> +
> +/* Command */
> +#define SFC_CMD				0x100
> +#define  SFC_CMD_IDX_SHIFT		0
> +#define  SFC_CMD_DUMMY_SHIFT		8
> +#define  SFC_CMD_DIR_RD			0
> +#define  SFC_CMD_DIR_WR			1
> +#define  SFC_CMD_DIR_SHIFT		12
> +#define  SFC_CMD_ADDR_ZERO		(0x0 << 14)
> +#define  SFC_CMD_ADDR_24BITS		(0x1 << 14)
> +#define  SFC_CMD_ADDR_32BITS		(0x2 << 14)
> +#define  SFC_CMD_ADDR_FRS		(0x3 << 14)
> +#define  SFC_CMD_TRAN_BYTES_SHIFT	16
> +#define  SFC_CMD_CS_SHIFT		30
> +
> +/* Address */
> +#define SFC_ADDR			0x104
> +
> +/* Data */
> +#define SFC_DATA			0x108
> +
> +/* The controller and documentation reports that it supports up to 4 CS
> + * devices (0-3), however I have only been able to test a single CS (CS 0)
> + * due to the configuration of my device.
> + */
> +#define SFC_MAX_CHIPSELECT_NUM		4
> +
> +/* The SFC can transfer max 16KB - 1 at one time
> + * we set it to 15.5KB here for alignment.
> + */
> +#define SFC_MAX_TRANS_BYTES		(512 * 31)
> +
> +/* Maximum clock values from datasheet suggest keeping clock value under
> + * 150MHz. No minimum or average value is suggested, but the U-boot BSP driver
> + * has a minimum of 10MHz and a default of 80MHz which seems reasonable.
> + */
> +#define SFC_MIN_SPEED_HZ		(10 * 1000 * 1000)
> +#define SFC_DEFAULT_SPEED_HZ		(80 * 1000 * 1000)
> +#define SFC_MAX_SPEED_HZ		(150 * 1000 * 1000)
> +
> +#define SFC_CMD_DUMMY(x) \
> +	((x) << SFC_CMD_DUMMY_SHIFT)
> +
> +enum rockchip_sfc_iftype {
> +	IF_TYPE_STD,
> +	IF_TYPE_DUAL,
> +	IF_TYPE_QUAD,
> +};
> +
> +struct rockchip_sfc;
> +struct rockchip_sfc_chip_priv {
> +	u8 cs;
> +	u32 clk_rate;
> +	struct rockchip_sfc *sfc;
> +};
> +
> +struct rockchip_sfc {
> +	struct device *dev;
> +	void __iomem *regbase;
> +	struct clk *hclk;
> +	struct clk *clk;
> +	/* virtual mapped addr for dma_buffer */
> +	void *buffer;
> +	dma_addr_t dma_buffer;
> +	struct completion cp;
> +	struct rockchip_sfc_chip_priv flash[SFC_MAX_CHIPSELECT_NUM];
> +	u8 num_chip;
> +	bool use_dma;
> +};
> +
> +static int rockchip_sfc_get_if_type(const struct spi_mem_op *op,
> +				    struct rockchip_sfc *sfc)
> +{
> +	switch (op->data.buswidth) {
> +	case 1:
> +		return IF_TYPE_STD;
> +	case 2:
> +		return IF_TYPE_DUAL;
> +	case 4:
> +		return IF_TYPE_QUAD;
> +	default:
> +		dev_err(sfc->dev, "unsupported SPI read mode\n");
> +		return -EINVAL;
> +	}
> +}
> +
> +static int rockchip_sfc_reset(struct rockchip_sfc *sfc)
> +{
> +	int err;
> +	u32 status;
> +
> +	writel_relaxed(SFC_RCVR_RESET, sfc->regbase + SFC_RCVR);
> +
> +	err = readl_poll_timeout(sfc->regbase + SFC_RCVR, status,
> +				 !(status & SFC_RCVR_RESET), 20,
> +				 jiffies_to_usecs(HZ));
> +	if (err)
> +		dev_err(sfc->dev, "SFC reset never finished\n");
> +
> +	/* Still need to clear the masked interrupt from RISR */
> +	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
> +		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
> +		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
> +		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
> +		       sfc->regbase + SFC_ICLR);
> +
> +	dev_dbg(sfc->dev, "reset\n");
> +
> +	return err;
> +}
> +
> +static int rockchip_sfc_init(struct rockchip_sfc *sfc)
> +{
> +	int err;
> +
> +	err = clk_set_rate(sfc->clk, SFC_DEFAULT_SPEED_HZ);
> +	if (err)
> +		return err;
> +
> +	err = rockchip_sfc_reset(sfc);
> +	if (err)
> +		return err;
> +
> +	/* Mask all eight interrupts */
> +	writel_relaxed(0xff, sfc->regbase + SFC_IMR);
> +
> +	writel_relaxed(SFC_CTRL_PHASE_SEL_NEGETIVE, sfc->regbase + SFC_CTRL);
> +
> +	return 0;
> +}
> +
> +static inline int rockchip_sfc_get_fifo_level(struct rockchip_sfc *sfc, int wr)
> +{
> +	u32 fsr = readl_relaxed(sfc->regbase + SFC_FSR);
> +	int level;
> +
> +	if (wr)
> +		level = (fsr & SFC_FSR_TXLV_MASK) >> SFC_FSR_TXLV_SHIFT;
> +	else
> +		level = (fsr & SFC_FSR_RXLV_MASK) >> SFC_FSR_RXLV_SHIFT;
> +
> +	return level;
> +}
> +
> +static int rockchip_sfc_wait_fifo_ready(struct rockchip_sfc *sfc, int wr, u32 timeout)
> +{
> +	unsigned long deadline = jiffies + timeout;
> +	int level;
> +
> +	while (!(level = rockchip_sfc_get_fifo_level(sfc, wr))) {
> +		if (time_after_eq(jiffies, deadline)) {
> +			dev_warn(sfc->dev, "%s fifo timeout\n", wr ? "write" : "read");
> +			return -ETIMEDOUT;
> +		}
> +		udelay(1);
> +	}
> +
> +	return level;
> +}
> +
> +/* The SFC_CTRL register is a global control register,
> + * when the controller is in busy state(SFC_SR),
> + * SFC_CTRL cannot be set.
> + */
> +static void rockchip_sfc_wait_idle(struct rockchip_sfc *sfc, u32 timeout_us)
> +{
> +	u32 status;
> +	int ret;
> +
> +	ret = readl_poll_timeout(sfc->regbase + SFC_SR, status,
> +				 !(status & SFC_SR_IS_BUSY),
> +				 20, timeout_us);
> +	if (ret) {
> +		dev_err(sfc->dev, "wait sfc idle timeout\n");
> +		rockchip_sfc_reset(sfc);
> +	}
> +}
> +
> +static void rockchip_sfc_setup_ctrl(struct rockchip_sfc *sfc)
> +{
> +	u32 reg;
> +
> +	reg = IF_TYPE_STD << SFC_CTRL_DATA_BITS_SHIFT;
> +	reg |= IF_TYPE_STD << SFC_CTRL_ADDR_BITS_SHIFT;
> +	reg |= IF_TYPE_STD << SFC_CTRL_CMD_BITS_SHIFT;
> +	reg |= SFC_CTRL_PHASE_SEL_NEGETIVE;
> +
> +	rockchip_sfc_wait_idle(sfc, 10000);
> +
> +	writel_relaxed(reg, sfc->regbase + SFC_CTRL);
> +}
> +
> +static int rockchip_sfc_op_reg(struct rockchip_sfc_chip_priv *priv,
> +			       u8 opcode, int len, u8 optype)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +	u32 reg;
> +
> +	rockchip_sfc_setup_ctrl(sfc);
> +
> +	reg = opcode << SFC_CMD_IDX_SHIFT;
> +	reg |= len << SFC_CMD_TRAN_BYTES_SHIFT;
> +	reg |= priv->cs << SFC_CMD_CS_SHIFT;
> +	reg |= optype << SFC_CMD_DIR_SHIFT;
> +	writel_relaxed(reg, sfc->regbase + SFC_CMD);
> +
> +	return 0;
> +}
> +
> +static int rockchip_sfc_write_fifo(struct rockchip_sfc *sfc, const u8 *buf, int len)
> +{
> +	u8 bytes = len & 0x3;
> +	u32 dwords;
> +	int tx_level;
> +	u32 write_words;
> +	u32 tmp = 0;
> +
> +	dwords = len >> 2;
> +	while (dwords) {
> +		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
> +		if (tx_level < 0)
> +			return tx_level;
> +		write_words = min_t(u32, tx_level, dwords);
> +		iowrite32_rep(sfc->regbase + SFC_DATA, buf, write_words);
> +		buf += write_words << 2;
> +		dwords -= write_words;
> +	}
> +
> +	/* write the rest of the bytes that are not a multiple of word size */
> +	if (bytes) {
> +		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
> +		if (tx_level < 0)
> +			return tx_level;
> +		memcpy(&tmp, buf, bytes);
> +		writel_relaxed(tmp, sfc->regbase + SFC_DATA);
> +	}
> +
> +	return len;
> +}
> +
> +static int rockchip_sfc_read_fifo(struct rockchip_sfc *sfc, u8 *buf, int len)
> +{
> +	u8 bytes = len & 0x3;
> +	u32 dwords;
> +	u8 read_words;
> +	int rx_level;
> +	int tmp;
> +
> +	/* word aligned access only */
> +	dwords = len >> 2;
> +	while (dwords) {
> +		rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
> +		if (rx_level < 0)
> +			return rx_level;
> +		read_words = min_t(u32, rx_level, dwords);
> +		ioread32_rep(sfc->regbase + SFC_DATA, buf, read_words);
> +		buf += read_words << 2;
> +		dwords -= read_words;
> +	}
> +
> +	/* read the rest of the bytes that are not a multiple of word size */
> +	if (bytes) {
> +		rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
> +		if (rx_level < 0)
> +			return rx_level;
> +		tmp = readl_relaxed(sfc->regbase + SFC_DATA);
> +		memcpy(buf, &tmp, bytes);
> +	}
> +
> +	return len;
> +}
> +
> +static int rockchip_sfc_read_reg(struct rockchip_sfc_chip_priv *priv,
> +				 const struct spi_mem_op *op)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +	int ret;
> +	int trans;
> +	size_t n_rx = op->data.nbytes;
> +	u8 opcode = op->cmd.opcode;
> +	u8 *rxbuf = op->data.buf.in;
> +
> +	trans = min_t(int, n_rx, SFC_MAX_TRANS_BYTES);
> +	ret = rockchip_sfc_op_reg(priv, opcode, trans, SFC_CMD_DIR_RD);
> +	if (ret)
> +		return ret;
> +
> +	ret = rockchip_sfc_read_fifo(sfc, rxbuf, trans);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int rockchip_sfc_write_reg(struct rockchip_sfc_chip_priv *priv,
> +				  const struct spi_mem_op *op)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +	int ret;
> +	size_t n_tx = op->data.nbytes;
> +	u8 opcode = op->cmd.opcode;
> +	const u8 *txbuf = op->data.buf.out;
> +
> +	ret = rockchip_sfc_op_reg(priv, opcode, n_tx, SFC_CMD_DIR_WR);
> +	if (ret)
> +		return ret;
> +	ret = rockchip_sfc_write_fifo(sfc, txbuf, n_tx);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int rockchip_sfc_setup_transfer(struct rockchip_sfc_chip_priv *priv,
> +				       const struct spi_mem_op *op,
> +				       loff_t from_to, size_t len, u8 op_type)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +	u8 if_type = IF_TYPE_STD;
> +	u8 addr_width = op->addr.nbytes;
> +	u8 read_dummy_bits = op->dummy.nbytes << 3;
> +	u32 reg;
> +
> +	if (op_type == SFC_CMD_DIR_RD)
> +		if_type = rockchip_sfc_get_if_type(op, sfc);
> +
> +	rockchip_sfc_wait_idle(sfc, 10000);
> +
> +	writel_relaxed((if_type << SFC_CTRL_DATA_BITS_SHIFT) |
> +		       (IF_TYPE_STD << SFC_CTRL_ADDR_BITS_SHIFT) |
> +		       (IF_TYPE_STD << SFC_CTRL_CMD_BITS_SHIFT) |
> +		       SFC_CTRL_PHASE_SEL_NEGETIVE,
> +		       sfc->regbase + SFC_CTRL);
> +
> +	reg = op->cmd.opcode << SFC_CMD_IDX_SHIFT;
> +
> +	reg |= op_type << SFC_CMD_DIR_SHIFT;
> +	reg |= (addr_width == 4) ?
> +		SFC_CMD_ADDR_32BITS : SFC_CMD_ADDR_24BITS;
> +
> +	reg |= priv->cs << SFC_CMD_CS_SHIFT;
> +	reg |= len << SFC_CMD_TRAN_BYTES_SHIFT;
> +
> +	if (op_type == SFC_CMD_DIR_RD)
> +		reg |= SFC_CMD_DUMMY(read_dummy_bits);
> +
> +	writel_relaxed(reg, sfc->regbase + SFC_CMD);
> +	writel_relaxed(from_to, sfc->regbase + SFC_ADDR);
> +
> +	return 0;
> +}
> +
> +static int rockchip_sfc_do_dma_transfer(struct rockchip_sfc_chip_priv *priv,
> +					const struct spi_mem_op *op, loff_t from_to,
> +					dma_addr_t dma_buf, size_t len, u8 op_type)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +	u32 reg;
> +	int err = 0;
> +
> +	init_completion(&sfc->cp);
> +
> +	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
> +		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
> +		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
> +		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
> +		       sfc->regbase + SFC_ICLR);
> +
> +	/* Enable transfer complete interrupt */
> +	reg = readl_relaxed(sfc->regbase + SFC_IMR);
> +	reg &= ~SFC_IMR_TRAN_FINISH;
> +	writel_relaxed(reg, sfc->regbase + SFC_IMR);
> +
> +	err = rockchip_sfc_setup_transfer(priv, op, from_to, len, op_type);
> +	if (err < 0)
> +		return err;
> +
> +	writel_relaxed(dma_buf, sfc->regbase + SFC_DMA_ADDR);
> +
> +	/*
> +	 * Start dma but note that the sfc->dma_buffer is derived from
> +	 * dmam_alloc_coherent so we don't actually need any sync operations
> +	 * for coherent dma memory.
> +	 */
> +	writel(0x1, sfc->regbase + SFC_DMA_TRIGGER);
> +
> +	/* Wait for the interrupt. */
> +	if (!wait_for_completion_timeout(&sfc->cp, msecs_to_jiffies(2000))) {
> +		dev_err(sfc->dev, "DMA wait for transfer finish timeout\n");
> +		err = -ETIMEDOUT;
> +	}
> +
> +	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
> +		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
> +		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
> +		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
> +		       sfc->regbase + SFC_ICLR);
> +	/* Disable transfer finish interrupt */
> +	reg = readl_relaxed(sfc->regbase + SFC_IMR);
> +	reg |= SFC_IMR_TRAN_FINISH;
> +	writel_relaxed(reg, sfc->regbase + SFC_IMR);
> +
> +	if (err) {
> +		rockchip_sfc_reset(sfc);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static inline int rockchip_sfc_pio_write(struct rockchip_sfc *sfc, u_char *buf,
> +					 size_t len)
> +{
> +	return rockchip_sfc_write_fifo(sfc, buf, len);
> +}
> +
> +static inline int rockchip_sfc_pio_read(struct rockchip_sfc *sfc, u_char *buf,
> +					size_t len)
> +{
> +	return rockchip_sfc_read_fifo(sfc, buf, len);
> +}
> +
> +static int rockchip_sfc_pio_transfer(struct rockchip_sfc_chip_priv *priv,
> +				     const struct spi_mem_op *op, loff_t from_to, size_t len,
> +				     u_char *buf, u8 op_type)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +	size_t trans;
> +	int ret;
> +
> +	trans = min_t(size_t, SFC_MAX_TRANS_BYTES, len);
> +	ret = rockchip_sfc_setup_transfer(priv, op, from_to, trans, op_type);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (op_type == SFC_CMD_DIR_WR)
> +		ret = rockchip_sfc_pio_write(sfc, buf, trans);
> +	else
> +		ret = rockchip_sfc_pio_read(sfc, buf, trans);
> +
> +	return ret;
> +}
> +
> +static int rockchip_sfc_dma_transfer(struct rockchip_sfc_chip_priv *priv,
> +				     const struct spi_mem_op *op, loff_t from_to, size_t len,
> +				     u_char *buf, u8 op_type)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +	size_t trans;
> +	int ret;
> +
> +	trans = min_t(size_t, SFC_MAX_TRANS_BYTES, len);
> +
> +	if (op_type == SFC_CMD_DIR_WR)
> +		memcpy(sfc->buffer, buf, trans);
> +
> +	ret = rockchip_sfc_do_dma_transfer(priv, op, from_to, sfc->dma_buffer,
> +					   trans, op_type);
> +	if (ret) {
> +		dev_warn(sfc->dev, "DMA timeout\n");
> +		return ret;
> +	}
> +
> +	if (op_type == SFC_CMD_DIR_RD)
> +		memcpy(buf, sfc->buffer, trans);
> +
> +	return trans;
> +}
> +
> +static ssize_t rockchip_sfc_do_rd_wr(struct rockchip_sfc_chip_priv *priv,
> +				     const struct spi_mem_op *op, loff_t from_to, size_t len,
> +				     u_char *buf, u32 op_type)
> +{
> +	struct rockchip_sfc *sfc = priv->sfc;
> +
> +	/* DMA can only handle word aligned transfer chunks */
> +	if (likely(sfc->use_dma) && !(len & 0x3))
> +		return rockchip_sfc_dma_transfer(priv, op, from_to, len, buf, op_type);
> +	else
> +		return rockchip_sfc_pio_transfer(priv, op, from_to, len, buf, op_type);
> +}
> +
> +static ssize_t rockchip_sfc_read(struct rockchip_sfc_chip_priv *priv,
> +				 const struct spi_mem_op *op)
> +{
> +	loff_t from = op->addr.val;
> +	size_t len = op->data.nbytes;
> +	u_char *read_buf = op->data.buf.in;
> +
> +	return rockchip_sfc_do_rd_wr(priv, op, from, len, read_buf, SFC_CMD_DIR_RD);
> +}
> +
> +static ssize_t rockchip_sfc_write(struct rockchip_sfc_chip_priv *priv,
> +				  const struct spi_mem_op *op)
> +{
> +	loff_t to = op->addr.val;
> +	size_t len = op->data.nbytes;
> +	const u_char *write_buf = op->data.buf.out;
> +
> +	return rockchip_sfc_do_rd_wr(priv, op, to, len, (u_char *)write_buf, SFC_CMD_DIR_WR);
> +}
> +
> +static int rockchip_sfc_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
> +{
> +	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
> +	struct rockchip_sfc_chip_priv *priv = &sfc->flash[mem->spi->chip_select];
> +
> +	if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) {
> +		if (!op->addr.nbytes)
> +			return rockchip_sfc_read_reg(priv, op);
> +
> +		return rockchip_sfc_read(priv, op);
> +	}
> +
> +	if (!op->addr.nbytes || !op->data.buf.out)
> +		return rockchip_sfc_write_reg(priv, op);
> +
> +	return rockchip_sfc_write(priv, op);
> +}
> +
> +static int rockchip_sfc_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
> +{
> +	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
> +	struct rockchip_sfc_chip_priv *priv = &sfc->flash[mem->spi->chip_select];
> +	int ret;
> +
> +	ret = clk_set_rate(sfc->clk, priv->clk_rate);
> +	if (ret)
> +		return ret;
> +
> +	ret = rockchip_sfc_mem_process(mem, op);
> +	if (ret < 0) {
> +		dev_err(&mem->spi->dev, "operation failed with %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static const char *rockchip_sfc_get_name(struct spi_mem *mem)
> +{
> +	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
> +	struct device *dev = sfc->dev;
> +
> +	return devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev), mem->spi->chip_select);
> +}
> +
> +static const struct spi_controller_mem_ops rockchip_sfc_mem_ops = {
> +	.exec_op = rockchip_sfc_exec_mem_op,
> +	.get_name = rockchip_sfc_get_name,
> +};
> +
> +static int rockchip_sfc_register(struct device_node *np,
> +				 struct rockchip_sfc *sfc)
> +{
> +	struct device *dev = sfc->dev;
> +	int ret;
> +
> +	ret = of_property_read_u8(np, "reg", &sfc->flash[sfc->num_chip].cs);
> +	if (ret) {
> +		dev_err(dev, "No reg property for %s\n",
> +			np->full_name);
> +		return ret;
> +	}
> +
> +	ret = of_property_read_u32(np, "spi-max-frequency",
> +				   &sfc->flash[sfc->num_chip].clk_rate);
> +	if (ret) {
> +		dev_err(dev, "No spi-max-frequency property for %s\n",
> +			np->full_name);
> +		return ret;
> +	}
> +
> +	sfc->flash[sfc->num_chip].sfc = sfc;
> +	sfc->num_chip++;
> +	return 0;
> +}
> +
> +static int rockchip_sfc_register_all(struct rockchip_sfc *sfc)
> +{
> +	struct device *dev = sfc->dev;
> +	struct device_node *np;
> +	int ret;
> +
> +	for_each_available_child_of_node(dev->of_node, np) {
> +		ret = rockchip_sfc_register(np, sfc);
> +		if (ret)
> +			dev_err(dev, "Failed to register all chips\n");
> +			return ret;
> +
> +		if (sfc->num_chip >= SFC_MAX_CHIPSELECT_NUM) {
> +			dev_warn(dev, "Exceeds the max cs limitation\n");
> +			break;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static irqreturn_t rockchip_sfc_irq_handler(int irq, void *dev_id)
> +{
> +	struct rockchip_sfc *sfc = dev_id;
> +	u32 reg;
> +
> +	reg = readl(sfc->regbase + SFC_RISR);
> +
> +	/* Clear interrupt if transfer is finished */
> +	if (reg & SFC_RISR_TRAN_FINISH) {
> +		writel_relaxed(reg, sfc->regbase + SFC_ICLR);
> +		complete(&sfc->cp);
> +		return IRQ_HANDLED;
> +	}
> +
> +	return IRQ_NONE;
> +}
> +
> +static int rockchip_sfc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct spi_master *master;
> +	struct resource *res;
> +	struct rockchip_sfc *sfc;
> +	int ret;
> +
> +	master = spi_alloc_master(&pdev->dev, sizeof(*sfc));

We should use devm_spi_alloc_master here since we're not freeing
the allocation if we fail.

> +	if (!master) {

We should just return here (no dev_err) since an error will stackdump.

> +		dev_err(&pdev->dev, "spi_alloc_master failed\n");
> +		return -ENOMEM;
> +	}
> +
> +	master->mem_ops = &rockchip_sfc_mem_ops;
> +	master->dev.of_node = pdev->dev.of_node;
> +	master->mode_bits = SPI_RX_QUAD | SPI_RX_DUAL;
> +	master->min_speed_hz = SFC_MIN_SPEED_HZ;
> +	master->max_speed_hz = SFC_MAX_SPEED_HZ;
> +
> +	sfc = spi_master_get_devdata(master);
> +	sfc->dev = dev;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	sfc->regbase = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(sfc->regbase))
> +		return PTR_ERR(sfc->regbase);
> +
> +	sfc->clk = devm_clk_get(&pdev->dev, "sfc");
> +	if (IS_ERR(sfc->clk)) {
> +		dev_err(&pdev->dev, "Failed to get sfc interface clk\n");
> +		return PTR_ERR(sfc->clk);
> +	}
> +
> +	sfc->hclk = devm_clk_get(&pdev->dev, "ahb");
> +	if (IS_ERR(sfc->hclk)) {
> +		dev_err(&pdev->dev, "Failed to get sfc ahb clk\n");
> +		return PTR_ERR(sfc->hclk);
> +	}
> +
> +	sfc->use_dma = !of_property_read_bool(sfc->dev->of_node,
> +					      "rockchip,sfc-no-dma");
> +
> +	if (sfc->use_dma) {
> +		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> +		if (ret) {
> +			dev_warn(dev, "Unable to set dma mask\n");
> +			return ret;
> +		}
> +
> +		sfc->buffer = dmam_alloc_coherent(dev, SFC_MAX_TRANS_BYTES,
> +						  &sfc->dma_buffer,
> +						  GFP_KERNEL);
> +		if (!sfc->buffer)
> +			return -ENOMEM;
> +	}
> +
> +	ret = clk_prepare_enable(sfc->hclk);
> +	if (ret) {

We don't need to print an error and goto anything, we should just return
a failure at this point. No need for the err_hclk label either.

> +		dev_err(&pdev->dev, "Failed to enable ahb clk\n");
> +		goto err_hclk;
> +	}
> +
> +	ret = clk_prepare_enable(sfc->clk);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to enable interface clk\n");
> +		goto err_clk;
> +	}
> +
> +	/* Find the irq */
> +	ret = platform_get_irq(pdev, 0);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to get the irq\n");
> +		goto err_irq;
> +	}
> +
> +	ret = devm_request_irq(dev, ret, rockchip_sfc_irq_handler,
> +			       0, pdev->name, sfc);
> +	if (ret) {
> +		dev_err(dev, "Failed to request irq\n");
> +		goto err_irq;
> +	}
> +
> +	sfc->num_chip = 0;
> +	ret = rockchip_sfc_init(sfc);
> +	if (ret)
> +		goto err_irq;
> +
> +	ret = rockchip_sfc_register_all(sfc);
> +	if (ret)
> +		goto err_irq;
> +

We should use spi_register_master, not devm_spi_register_master here.

> +	ret = devm_spi_register_master(dev, master);
> +	if (ret)
> +		goto err_irq;
> +
> +	return 0;
> +
> +err_irq:
> +	clk_disable_unprepare(sfc->clk);
> +err_clk:
> +	clk_disable_unprepare(sfc->hclk);
> +err_hclk:
> +	return ret;
> +}
> +
> +static int rockchip_sfc_remove(struct platform_device *pdev)
> +{
> +	struct rockchip_sfc *sfc = platform_get_drvdata(pdev);
> +

We need to add an spi_unregister_master here.

The comments for these changes from Lukas are as follows:

You need to use spi_register_master() here (*not* the devm variant)
and add spi_unregister_master() at the top of rockchip_sfc_remove().

The reason is that ->remove() is executed *before* devres resources
are freed and rockchip_sfc_remove() disables the clocks, presumably
rendering the chip inaccessible.

However the chip may be performing SPI transfers until
spi_unregister_master() returns, so the chip needs to be accessible
as long.

Because you're using devm_spi_register_master(), the chip may try
to perform SPI transfers even though its clocks have been disabled.
So you've got an ordering problem with the devm variant.

> +	clk_disable_unprepare(sfc->clk);
> +	clk_disable_unprepare(sfc->hclk);
> +	return 0;
> +}
> +
> +static const struct of_device_id rockchip_sfc_dt_ids[] = {
> +	{ .compatible = "rockchip,rk3036-sfc"},
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rockchip_sfc_dt_ids);
> +
> +static struct platform_driver rockchip_sfc_driver = {
> +	.driver = {
> +		.name	= "rockchip-sfc",
> +		.of_match_table = rockchip_sfc_dt_ids,
> +	},
> +	.probe	= rockchip_sfc_probe,
> +	.remove	= rockchip_sfc_remove,
> +};
> +module_platform_driver(rockchip_sfc_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Rockchip Serial Flash Controller Driver");

Should we change this to you?  Thanks.

> +MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>");
> -- 
> 2.17.1
> 
> 
> 

^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2021-06-07 15:28 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-07 12:42 [PATCH v5 0/8] Add Rockchip SFC(serial flash controller) support Jon Lin
2021-06-07 12:42 ` [PATCH v5 1/8] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller Jon Lin
2021-06-07 12:42 ` [PATCH v5 2/8] spi: rockchip-sfc: add rockchip " Jon Lin
2021-06-07 15:28   ` Chris Morgan
2021-06-07 12:42 ` [PATCH v5 3/8] arm64: dts: rockchip: Add SFC to PX30 Jon Lin
2021-06-07 12:42 ` [PATCH v5 4/8] clk: rockchip: Add support for hclk_sfc on rk3036 Jon Lin
2021-06-07 12:44 ` [PATCH v5 5/8] arm: dts: rockchip: Add SFC to RK3036 Jon Lin
2021-06-07 12:44   ` [PATCH v5 6/8] arm: dts: rockchip: Add SFC to RV1108 Jon Lin
2021-06-07 12:44   ` [PATCH v5 7/8] arm64: dts: rockchip: Add SFC to RK3308 Jon Lin
2021-06-07 12:44   ` [PATCH v5 8/8] arm64: dts: rockchip: Enable SFC for Odroid Go Advance Jon Lin

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