* [PATCH v6 0/4] Add Nvidia Tegra GPC-DMA driver
@ 2021-09-17 14:11 Akhil R
2021-09-17 14:11 ` [PATCH v6 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
` (4 more replies)
0 siblings, 5 replies; 18+ messages in thread
From: Akhil R @ 2021-09-17 14:11 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Add support for Nvida Tegra general purpose DMA driver for
Tegra186 and Tegra194 platform.
Changes in patch v6:
* Removed stream-id from DT. Get stream_id in driver using iommu api
* Corrections/indentation in nvidia,tegra186-gpc-dma.yaml and dtsi
v5 - https://lkml.org/lkml/2021/9/16/455
v4 - https://lkml.org/lkml/2021/9/8/513
v3 - https://lkml.org/lkml/2021/8/27/34
v2 - https://lkml.org/lkml/2020/8/6/90
v1 - https://lkml.org/lkml/2020/7/20/96
Akhil R (4):
dt-bindings: dmaengine: Add doc for tegra gpcdma
dmaengine: tegra: Add tegra gpcdma driver
arm64: defconfig: tegra: Enable GPCDMA
arm64: tegra: Add GPCDMA node for tegra186 and tegra194
.../bindings/dma/nvidia,tegra186-gpc-dma.yaml | 98 ++
arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi | 4 +
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 44 +
arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi | 4 +
arch/arm64/boot/dts/nvidia/tegra194.dtsi | 44 +
arch/arm64/configs/defconfig | 1 +
drivers/dma/Kconfig | 12 +
drivers/dma/Makefile | 1 +
drivers/dma/tegra186-gpc-dma.c | 1375 ++++++++++++++++++++
9 files changed, 1583 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
create mode 100644 drivers/dma/tegra186-gpc-dma.c
--
2.7.4
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v6 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma
2021-09-17 14:11 [PATCH v6 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
@ 2021-09-17 14:11 ` Akhil R
2021-09-17 14:11 ` [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
` (3 subsequent siblings)
4 siblings, 0 replies; 18+ messages in thread
From: Akhil R @ 2021-09-17 14:11 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Add DT binding document for Nvidia Tegra GPCDMA controller.
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
.../bindings/dma/nvidia,tegra186-gpc-dma.yaml | 98 ++++++++++++++++++++++
1 file changed, 98 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
new file mode 100644
index 0000000..3dcf5a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/nvidia,tegra186-gpc-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nvidia Tegra GPC DMA Controller Device Tree Bindings
+
+description: |
+ The Tegra Genernal Purpose Central (GPC) DMA controller is used for faster
+ data transfers between memory to memory, memory to device and device to
+ memory.
+
+maintainers:
+ - Jon Hunter <jonathanh@nvidia.com>
+ - Rajesh Gumasta <rgumasta@nvidia.com>
+
+allOf:
+ - $ref: "dma-controller.yaml#"
+
+properties:
+ "#dma-cells":
+ const: 1
+
+ compatible:
+ - enum:
+ - nvidia,tegra186-gpcdma
+ - nvidia,tegra194-gpcdma
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 1
+ maxItems: 32
+
+ resets:
+ maxItems: 1
+
+ reset-names:
+ const: gpcdma
+
+ iommus:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - resets
+ - reset-names
+ - "#dma-cells"
+ - iommus
+
+examples:
+ - |
+ gpcdma: dma@2600000 {
+ compatible = "nvidia,tegra186-gpcdma";
+ reg = <0x0 0x2600000 0x0 0x210000>;
+ resets = <&bpmp TEGRA186_RESET_GPCDMA>;
+ reset-names = "gpcdma";
+ interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ iommus = <&smmu TEGRA_SID_GPCDMA_0>;
+ dma-coherent;
+ };
+...
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-17 14:11 [PATCH v6 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
2021-09-17 14:11 ` [PATCH v6 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
@ 2021-09-17 14:11 ` Akhil R
2021-09-17 15:36 ` Jon Hunter
2021-09-17 14:11 ` [PATCH v6 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
` (2 subsequent siblings)
4 siblings, 1 reply; 18+ messages in thread
From: Akhil R @ 2021-09-17 14:11 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul, Pavan Kunapuli
Adding GPC DMA controller driver for Tegra186 and Tegra194. The driver
supports dma transfers between memory to memory, IO peripheral to memory
and memory to IO peripheral.
Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
drivers/dma/Kconfig | 12 +
drivers/dma/Makefile | 1 +
drivers/dma/tegra186-gpc-dma.c | 1375 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1388 insertions(+)
create mode 100644 drivers/dma/tegra186-gpc-dma.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 39b5b46..7d7f69f 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -632,6 +632,18 @@ config TEGRA210_ADMA
peripheral and vice versa. It does not support memory to
memory data transfer.
+config TEGRA186_GPC_DMA
+ tristate "NVIDIA Tegra GPC DMA support"
+ depends on ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC || COMPILE_TEST
+ select DMA_ENGINE
+ help
+ Support for the NVIDIA Tegra186 and Tegra194 GPC DMA controller
+ driver. The DMA controller has multiple DMA channels which can
+ be configured for different peripherals like UART, SPI, etc
+ which are on APB bus.
+ This DMA controller transfers data from memory to peripheral FIFO
+ or vice versa. It also supports memory to memory data transfer.
+
config TIMB_DMA
tristate "Timberdale FPGA DMA support"
depends on MFD_TIMBERDALE || COMPILE_TEST
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index aa69094..d3941ec 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -73,6 +73,7 @@ obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
obj-$(CONFIG_TEGRA210_ADMA) += tegra210-adma.o
+obj-$(CONFIG_TEGRA186_GPC_DMA) += tegra186-gpc-dma.o
obj-$(CONFIG_TIMB_DMA) += timb_dma.o
obj-$(CONFIG_UNIPHIER_MDMAC) += uniphier-mdmac.o
obj-$(CONFIG_UNIPHIER_XDMAC) += uniphier-xdmac.o
diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c
new file mode 100644
index 0000000..50bde6f
--- /dev/null
+++ b/drivers/dma/tegra186-gpc-dma.c
@@ -0,0 +1,1375 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * DMA driver for Nvidia's Tegra186 and Tegra194 GPC DMA controller.
+ *
+ * Copyright (c) 2014-2021, NVIDIA CORPORATION. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/iommu.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <dt-bindings/memory/tegra186-mc.h>
+#include "virt-dma.h"
+
+/* CSR register */
+#define TEGRA_GPCDMA_CHAN_CSR 0x00
+#define TEGRA_GPCDMA_CSR_ENB BIT(31)
+#define TEGRA_GPCDMA_CSR_IE_EOC BIT(30)
+#define TEGRA_GPCDMA_CSR_ONCE BIT(27)
+
+#define TEGRA_GPCDMA_CSR_FC_MODE GENMASK(25, 24)
+#define TEGRA_GPCDMA_CSR_FC_MODE_NO_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 0)
+#define TEGRA_GPCDMA_CSR_FC_MODE_ONE_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 1)
+#define TEGRA_GPCDMA_CSR_FC_MODE_TWO_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 2)
+#define TEGRA_GPCDMA_CSR_FC_MODE_FOUR_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 3)
+
+#define TEGRA_GPCDMA_CSR_DMA GENMASK(23, 21)
+#define TEGRA_GPCDMA_CSR_DMA_IO2MEM_NO_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 0)
+#define TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 1)
+#define TEGRA_GPCDMA_CSR_DMA_MEM2IO_NO_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 2)
+#define TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 3)
+#define TEGRA_GPCDMA_CSR_DMA_MEM2MEM \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 4)
+#define TEGRA_GPCDMA_CSR_DMA_FIXED_PAT \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 6)
+
+#define TEGRA_GPCDMA_CSR_REQ_SEL_MASK GENMASK(20, 16)
+#define TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, 4)
+#define TEGRA_GPCDMA_CSR_IRQ_MASK BIT(15)
+#define TEGRA_GPCDMA_CSR_WEIGHT GENMASK(13, 10)
+
+/* STATUS register */
+#define TEGRA_GPCDMA_CHAN_STATUS 0x004
+#define TEGRA_GPCDMA_STATUS_BUSY BIT(31)
+#define TEGRA_GPCDMA_STATUS_ISE_EOC BIT(30)
+#define TEGRA_GPCDMA_STATUS_PING_PONG BIT(28)
+#define TEGRA_GPCDMA_STATUS_DMA_ACTIVITY BIT(27)
+#define TEGRA_GPCDMA_STATUS_CHANNEL_PAUSE BIT(26)
+#define TEGRA_GPCDMA_STATUS_CHANNEL_RX BIT(25)
+#define TEGRA_GPCDMA_STATUS_CHANNEL_TX BIT(24)
+#define TEGRA_GPCDMA_STATUS_IRQ_INTR_STA BIT(23)
+#define TEGRA_GPCDMA_STATUS_IRQ_STA BIT(21)
+#define TEGRA_GPCDMA_STATUS_IRQ_TRIG_STA BIT(20)
+
+#define TEGRA_GPCDMA_CHAN_CSRE 0x008
+#define TEGRA_GPCDMA_CHAN_CSRE_PAUSE BIT(31)
+
+/* Source address */
+#define TEGRA_GPCDMA_CHAN_SRC_PTR 0x00C
+
+/* Destination address */
+#define TEGRA_GPCDMA_CHAN_DST_PTR 0x010
+
+/* High address pointer */
+#define TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR 0x014
+#define TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR GENMASK(7, 0)
+#define TEGRA_GPCDMA_HIGH_ADDR_DST_PTR GENMASK(23, 16)
+
+/* MC sequence register */
+#define TEGRA_GPCDMA_CHAN_MCSEQ 0x18
+#define TEGRA_GPCDMA_MCSEQ_DATA_SWAP BIT(31)
+#define TEGRA_GPCDMA_MCSEQ_REQ_COUNT GENMASK(30, 25)
+#define TEGRA_GPCDMA_MCSEQ_BURST GENMASK(24, 23)
+#define TEGRA_GPCDMA_MCSEQ_BURST_2 \
+ FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 0)
+#define TEGRA_GPCDMA_MCSEQ_BURST_16 \
+ FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 3)
+#define TEGRA_GPCDMA_MCSEQ_WRAP1 GENMASK(22, 20)
+#define TEGRA_GPCDMA_MCSEQ_WRAP0 GENMASK(19, 17)
+#define TEGRA_GPCDMA_MCSEQ_WRAP_NONE 0
+
+#define TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK GENMASK(13, 7)
+#define TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK GENMASK(6, 0)
+
+/* MMIO sequence register */
+#define TEGRA_GPCDMA_CHAN_MMIOSEQ 0x01c
+#define TEGRA_GPCDMA_MMIOSEQ_DBL_BUF BIT(31)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH GENMASK(30, 28)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 0)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 1)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 2)
+#define TEGRA_GPCDMA_MMIOSEQ_DATA_SWAP BIT(27)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST GENMASK(26, 23)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_1 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 0)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_2 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 1)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_4 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 3)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_8 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 7)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_16 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 15)
+#define TEGRA_GPCDMA_MMIOSEQ_MASTER_ID GENMASK(22, 19)
+#define TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD GENMASK(18, 16)
+#define TEGRA_GPCDMA_MMIOSEQ_MMIO_PROT GENMASK(8, 7)
+
+/* Channel WCOUNT */
+#define TEGRA_GPCDMA_CHAN_WCOUNT 0x20
+
+/* Transfer count */
+#define TEGRA_GPCDMA_CHAN_XFER_COUNT 0x24
+
+/* DMA byte count status */
+#define TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS 0x28
+
+/* Error Status Register */
+#define TEGRA_GPCDMA_CHAN_ERR_STATUS 0x30
+#define TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT (8)
+#define TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK (0xF)
+#define TEGRA_GPCDMA_CHAN_ERR_TYPE(err) ( \
+ ((err) >> TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT) & \
+ TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK)
+#define TEGRA_DMA_BM_FIFO_FULL_ERR (0xF)
+#define TEGRA_DMA_PERIPH_FIFO_FULL_ERR (0xE)
+#define TEGRA_DMA_PERIPH_ID_ERR (0xD)
+#define TEGRA_DMA_STREAM_ID_ERR (0xC)
+#define TEGRA_DMA_MC_SLAVE_ERR (0xB)
+#define TEGRA_DMA_MMIO_SLAVE_ERR (0xA)
+
+/* Fixed Pattern */
+#define TEGRA_GPCDMA_CHAN_FIXED_PATTERN 0x34
+
+#define TEGRA_GPCDMA_CHAN_TZ 0x38
+#define TEGRA_GPCDMA_CHAN_TZ_MMIO_PROT_1 BIT(0)
+#define TEGRA_GPCDMA_CHAN_TZ_MC_PROT_1 BIT(1)
+
+#define TEGRA_GPCDMA_CHAN_SPARE 0x3c
+#define TEGRA_GPCDMA_CHAN_SPARE_EN_LEGACY_FC BIT(16)
+
+/*
+ * If any burst is in flight and DMA paused then this is the time to complete
+ * on-flight burst and update DMA status register.
+ */
+#define TEGRA_GPCDMA_BURST_COMPLETE_TIME 20
+#define TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT 100
+
+/* Channel base address offset from GPCDMA base address */
+#define TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET 0x10000
+
+struct tegra_dma;
+
+/*
+ * tegra_dma_chip_data Tegra chip specific DMA data
+ * @nr_channels: Number of channels available in the controller.
+ * @channel_reg_size: Channel register size.
+ * @max_dma_count: Maximum DMA transfer count supported by DMA controller.
+ * @hw_support_pause: DMA HW engine support pause of the channel.
+ */
+struct tegra_dma_chip_data {
+ int nr_channels;
+ int channel_reg_size;
+ int max_dma_count;
+ bool hw_support_pause;
+};
+
+/* DMA channel registers */
+struct tegra_dma_channel_regs {
+ unsigned long csr;
+ unsigned long src_ptr;
+ unsigned long dst_ptr;
+ unsigned long high_addr_ptr;
+ unsigned long mc_seq;
+ unsigned long mmio_seq;
+ unsigned long wcount;
+ unsigned long fixed_pattern;
+};
+
+/*
+ * tegra_dma_desc: Tegra DMA descriptors which uses virt_dma_desc to
+ * manage client request and keep track of transfer status, callbacks
+ * and request counts etc.
+ */
+struct tegra_dma_desc {
+ struct virt_dma_desc vd;
+ int bytes_requested;
+ int bytes_transferred;
+ struct tegra_dma_channel *tdc;
+ struct tegra_dma_channel_regs ch_regs;
+};
+
+struct tegra_dma_channel;
+
+/*
+ * tegra_dma_channel: Channel specific information
+ */
+struct tegra_dma_channel {
+ struct virt_dma_chan vc;
+ struct tegra_dma_desc *dma_desc;
+ char name[30];
+ bool config_init;
+ int id;
+ int irq;
+ unsigned int stream_id;
+ unsigned long chan_base_offset;
+ raw_spinlock_t lock;
+ bool busy;
+ struct tegra_dma *tdma;
+ int slave_id;
+ bool sid_reserved;
+ enum dma_transfer_direction sid_dir;
+ struct dma_slave_config dma_sconfig;
+};
+
+/*
+ * tegra_dma: Tegra DMA specific information
+ */
+struct tegra_dma {
+ struct dma_device dma_dev;
+ struct device *dev;
+ void __iomem *base_addr;
+ const struct tegra_dma_chip_data *chip_data;
+ struct reset_control *rst;
+ unsigned long sid_m2d_reserved;
+ unsigned long sid_d2m_reserved;
+ unsigned long sid_m2m_reserved;
+ struct tegra_dma_channel channels[0];
+};
+
+static inline void tdc_write(struct tegra_dma_channel *tdc,
+ u32 reg, u32 val)
+{
+ writel_relaxed(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+}
+
+static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
+{
+ return readl_relaxed(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+}
+
+static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
+{
+ return container_of(dc, struct tegra_dma_channel, vc.chan);
+}
+
+static inline struct tegra_dma_desc *vd_to_tegra_dma_desc(struct virt_dma_desc *vd)
+{
+ return container_of(vd, struct tegra_dma_desc, vd);
+}
+
+static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
+{
+ return tdc->vc.chan.device->dev;
+}
+
+static void tegra_dma_dump_chan_regs(struct tegra_dma_channel *tdc)
+{
+ dev_dbg(tdc2dev(tdc), "DMA Channel %d name %s register dump:\n",
+ tdc->id, tdc->name);
+ dev_dbg(tdc2dev(tdc), "CSR %x STA %x CSRE %x SRC %x DST %x\n",
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_DST_PTR)
+ );
+ dev_dbg(tdc2dev(tdc), "MCSEQ %x IOSEQ %x WCNT %x XFER %x BSTA %x\n",
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_WCOUNT),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS)
+ );
+ dev_dbg(tdc2dev(tdc), "DMA ERR_STA %x\n",
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS));
+}
+
+static void tegra_dma_desc_free(struct virt_dma_desc *vd)
+{
+ kfree(container_of(vd, struct tegra_dma_desc, vd));
+}
+
+static int tegra_dma_slave_config(struct dma_chan *dc,
+ struct dma_slave_config *sconfig)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ if (tdc->dma_desc) {
+ dev_err(tdc2dev(tdc), "Configuration not allowed\n");
+ return -EBUSY;
+ }
+
+ memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
+ if (tdc->slave_id == -1)
+ tdc->slave_id = sconfig->slave_id;
+
+ tdc->config_init = true;
+ return 0;
+}
+
+static int tegra_dma_pause(struct tegra_dma_channel *tdc)
+{
+ u32 val;
+ int ret;
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, TEGRA_GPCDMA_CHAN_CSRE_PAUSE);
+
+ /* Wait until busy bit is de-asserted */
+ ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
+ tdc->chan_base_offset + TEGRA_GPCDMA_CHAN_STATUS,
+ val,
+ !(val & TEGRA_GPCDMA_STATUS_BUSY),
+ TEGRA_GPCDMA_BURST_COMPLETE_TIME,
+ TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
+
+ if (ret)
+ dev_err(tdc2dev(tdc), "DMA pause timed out\n");
+
+ return ret;
+}
+
+static void tegra_dma_stop(struct tegra_dma_channel *tdc)
+{
+ u32 csr, status;
+
+ csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
+
+ /* Disable interrupts */
+ csr &= ~TEGRA_GPCDMA_CSR_IE_EOC;
+
+ /* Disable DMA */
+ csr &= ~TEGRA_GPCDMA_CSR_ENB;
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
+
+ /* Clear interrupt status if it is there */
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
+ dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS, status);
+ }
+ tdc->busy = false;
+}
+
+static void tegra_dma_start(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_channel_regs *ch_regs;
+ struct virt_dma_desc *vdesc;
+
+ if (tdc->busy)
+ return;
+
+ vdesc = vchan_next_desc(&tdc->vc);
+ if (!vdesc)
+ return;
+
+ tdc->dma_desc = vd_to_tegra_dma_desc(vdesc);
+ if (!tdc->dma_desc)
+ return;
+
+ list_del(&vdesc->node);
+
+ tdc->dma_desc->tdc = tdc;
+ ch_regs = &tdc->dma_desc->ch_regs;
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_regs->wcount);
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, 0);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_regs->src_ptr);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_regs->dst_ptr);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR, ch_regs->high_addr_ptr);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_FIXED_PATTERN, ch_regs->fixed_pattern);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ, ch_regs->mmio_seq);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, ch_regs->mc_seq);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, 0);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, ch_regs->csr);
+
+ /* Start DMA */
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
+ ch_regs->csr | TEGRA_GPCDMA_CSR_ENB);
+
+ tdc->busy = true;
+}
+
+static void tegra_dma_sid_free(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+ unsigned int sid = tdc->slave_id;
+
+ switch (tdc->sid_dir) {
+ case DMA_MEM_TO_DEV:
+ clear_bit(sid, &tdma->sid_m2d_reserved);
+ break;
+ case DMA_DEV_TO_MEM:
+ clear_bit(sid, &tdma->sid_d2m_reserved);
+ break;
+ case DMA_MEM_TO_MEM:
+ clear_bit(sid, &tdma->sid_m2m_reserved);
+ break;
+ }
+
+ tdc->sid_reserved = false;
+ tdc->sid_dir = DMA_TRANS_NONE;
+}
+
+static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
+{
+ tegra_dma_sid_free(tdc);
+ kfree(tdc->dma_desc);
+}
+
+static void tegra_dma_isr_callback(struct tegra_dma_channel *tdc,
+ bool to_terminate)
+{
+ struct tegra_dma_desc *dma_desc;
+
+ tdc->busy = false;
+ dma_desc = tdc->dma_desc;
+ dma_desc->bytes_transferred += dma_desc->bytes_requested;
+
+ vchan_cookie_complete(&tdc->dma_desc->vd);
+
+ if (to_terminate)
+ return;
+
+ tegra_dma_start(tdc);
+}
+
+static void tegra_dma_chan_decode_error(struct tegra_dma_channel *tdc,
+ unsigned int err_status)
+{
+ switch (TEGRA_GPCDMA_CHAN_ERR_TYPE(err_status)) {
+ case TEGRA_DMA_BM_FIFO_FULL_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d bm fifo full\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_PERIPH_FIFO_FULL_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d peripheral fifo full\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_PERIPH_ID_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d illegal peripheral id\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_STREAM_ID_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d illegal stream id\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_MC_SLAVE_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d mc slave error\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_MMIO_SLAVE_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d mmio slave error\n", tdc->id);
+ break;
+
+ default:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d security violation %x\n", tdc->id,
+ err_status);
+ }
+}
+
+static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
+{
+ struct tegra_dma_channel *tdc = dev_id;
+ irqreturn_t ret = IRQ_NONE;
+ unsigned int err_status;
+ unsigned long status;
+
+ raw_spin_lock(&tdc->lock);
+
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ err_status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS);
+
+ if (err_status) {
+ tegra_dma_chan_decode_error(tdc, err_status);
+ tegra_dma_dump_chan_regs(tdc);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS, 0xFFFFFFFF);
+ }
+
+ if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS,
+ TEGRA_GPCDMA_STATUS_ISE_EOC);
+ tegra_dma_isr_callback(tdc, false);
+
+ ret = IRQ_HANDLED;
+ }
+
+ raw_spin_unlock(&tdc->lock);
+ return ret;
+}
+
+static void tegra_dma_issue_pending(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+
+ if (!tdc->busy)
+ if (vchan_issue_pending(&tdc->vc))
+ tegra_dma_start(tdc);
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+}
+
+static void tegra_dma_reset_client(struct tegra_dma_channel *tdc)
+{
+ u32 csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
+
+ csr &= ~(TEGRA_GPCDMA_CSR_REQ_SEL_MASK);
+ csr |= TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED;
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
+}
+
+static void tegra_dma_stop_client(struct tegra_dma_channel *tdc)
+{
+ int ret;
+ unsigned long status;
+
+ /* Before Reading DMA status to figure out number
+ * of bytes transferred by DMA channel:
+ * Change the client associated with the DMA channel
+ * to stop DMA engine from starting any more bursts for
+ * the given client and wait for in flight bursts to complete
+ */
+ tegra_dma_reset_client(tdc);
+
+ /* Wait for in flight data transfer to finish */
+ udelay(TEGRA_GPCDMA_BURST_COMPLETE_TIME);
+
+ /* If TX/RX path is still active wait till it becomes
+ * inactive
+ */
+
+ ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
+ tdc->chan_base_offset +
+ TEGRA_GPCDMA_CHAN_STATUS,
+ status,
+ !(status & (TEGRA_GPCDMA_STATUS_CHANNEL_TX |
+ TEGRA_GPCDMA_STATUS_CHANNEL_RX)),
+ 5,
+ TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
+ if (ret) {
+ dev_err(tdc2dev(tdc), "Timeout waiting for DMA burst completion!\n");
+ tegra_dma_dump_chan_regs(tdc);
+ }
+}
+
+static int tegra_dma_terminate_all(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long wcount = 0;
+ unsigned long status;
+ unsigned long flags;
+ bool was_busy;
+ int err;
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+
+ if (!tdc->dma_desc) {
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return 0;
+ }
+
+ if (!tdc->busy)
+ goto skip_dma_stop;
+
+ if (tdc->tdma->chip_data->hw_support_pause) {
+ err = tegra_dma_pause(tdc);
+ if (err) {
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return err;
+ }
+ } else {
+ tegra_dma_stop_client(tdc);
+ }
+
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT);
+ if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
+ dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
+ tegra_dma_isr_callback(tdc, true);
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT);
+ }
+
+ was_busy = tdc->busy;
+
+ tegra_dma_stop(tdc);
+ if (tdc->dma_desc && was_busy)
+ tdc->dma_desc->bytes_transferred +=
+ tdc->dma_desc->bytes_requested - (wcount * 4);
+
+skip_dma_stop:
+ tegra_dma_abort_all(tdc);
+ vchan_free_chan_resources(&tdc->vc);
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return 0;
+}
+
+static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_desc *dma_desc = NULL;
+ struct virt_dma_desc *vd;
+ unsigned int residual;
+ enum dma_status ret;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+
+ ret = dma_cookie_status(dc, cookie, txstate);
+ if (ret == DMA_COMPLETE) {
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+ }
+
+ vd = vchan_find_desc(&tdc->vc, cookie);
+ if (vd)
+ dma_desc = vd_to_tegra_dma_desc(vd);
+
+ if (dma_desc) {
+ residual = dma_desc->bytes_requested -
+ (dma_desc->bytes_transferred %
+ dma_desc->bytes_requested);
+ dma_set_residue(txstate, residual);
+ kfree(dma_desc);
+ } else {
+ dev_err(tdc2dev(tdc), "cookie %d is not found\n", cookie);
+ }
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+}
+
+static inline int get_bus_width(struct tegra_dma_channel *tdc,
+ enum dma_slave_buswidth slave_bw)
+{
+ switch (slave_bw) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32;
+ default:
+ dev_err(tdc2dev(tdc), "given slave bw is not supported\n");
+ return -EINVAL;
+ }
+}
+
+static inline int get_burst_size_by_len(int len)
+{
+ int ret;
+
+ switch (len) {
+ case BIT(0) ... BIT(2):
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
+ break;
+ case BIT(3):
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
+ break;
+ case BIT(4):
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
+ break;
+ case BIT(5):
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
+ break;
+ default:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
+ break;
+ }
+
+ return ret;
+}
+
+static inline int get_burst_size(struct tegra_dma_channel *tdc,
+ u32 burst_size,
+ enum dma_slave_buswidth slave_bw,
+ int len)
+{
+ int burst_mmio_width, burst_byte, ret;
+
+ /*
+ * burst_size from client is in terms of the bus_width.
+ * convert that into words.
+ */
+ burst_byte = burst_size * slave_bw;
+ burst_mmio_width = burst_byte / 4;
+
+ switch (burst_mmio_width) {
+ case 0:
+ ret = get_burst_size_by_len(len);
+ break;
+ case 1:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
+ break;
+ case 2 ... 3:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
+ break;
+ case 4 ... 7:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
+ break;
+ case 8 ... 15:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
+ break;
+ default:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
+ break;
+ }
+
+ return ret;
+}
+
+static int tegra_dma_reserve_sid(struct tegra_dma_channel *tdc,
+ enum dma_transfer_direction direction)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+ unsigned int sid = tdc->slave_id;
+
+ if (tdc->sid_reserved)
+ return tdc->sid_dir == direction ? 0 : -EINVAL;
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ if (test_and_set_bit(sid, &tdma->sid_m2d_reserved)) {
+ dev_err(tdma->dev, "slave id already in use\n");
+ return -EINVAL;
+ }
+ break;
+ case DMA_DEV_TO_MEM:
+ if (test_and_set_bit(sid, &tdma->sid_d2m_reserved)) {
+ dev_err(tdma->dev, "slave id already in use\n");
+ return -EINVAL;
+ }
+ break;
+ case DMA_MEM_TO_MEM:
+ if (test_and_set_bit(sid, &tdma->sid_m2m_reserved)) {
+ dev_err(tdma->dev, "slave id already in use\n");
+ return -EINVAL;
+ }
+ break;
+ }
+
+ tdc->sid_reserved = true;
+ tdc->sid_dir = direction;
+
+ return 0;
+}
+
+static int get_transfer_param(struct tegra_dma_channel *tdc,
+ enum dma_transfer_direction direction,
+ unsigned long *apb_addr,
+ unsigned long *mmio_seq,
+ unsigned long *csr,
+ unsigned int *burst_size,
+ enum dma_slave_buswidth *slave_bw)
+{
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ *apb_addr = tdc->dma_sconfig.dst_addr;
+ *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
+ *burst_size = tdc->dma_sconfig.dst_maxburst;
+ *slave_bw = tdc->dma_sconfig.dst_addr_width;
+ *csr = TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC;
+ return 0;
+ case DMA_DEV_TO_MEM:
+ *apb_addr = tdc->dma_sconfig.src_addr;
+ *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
+ *burst_size = tdc->dma_sconfig.src_maxburst;
+ *slave_bw = tdc->dma_sconfig.src_addr_width;
+ *csr = TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC;
+ return 0;
+ case DMA_MEM_TO_MEM:
+ *burst_size = tdc->dma_sconfig.src_addr_width;
+ *csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
+ return 0;
+ default:
+ dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
+ return -EINVAL;
+ }
+ return -EINVAL;
+}
+
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_dma_memset(struct dma_chan *dc, dma_addr_t dest, int value,
+ size_t len, unsigned long flags)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_desc *dma_desc;
+ unsigned long csr, mc_seq;
+
+ /* Set dma mode to fixed pattern */
+ csr = TEGRA_GPCDMA_CSR_DMA_FIXED_PAT;
+ /* Enable once or continuous mode */
+ csr |= TEGRA_GPCDMA_CSR_ONCE;
+ /* Enable IRQ mask */
+ csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
+ /* Enable the dma interrupt */
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_GPCDMA_CSR_IE_EOC;
+ /* Configure default priority weight for the channel */
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
+
+ mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+ /* retain stream-id and clean rest */
+ mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
+
+ /* Set the address wrapping */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+
+ /* Program outstanding MC requests */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
+ /* Set burst size */
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
+
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+ if (!dma_desc)
+ return NULL;
+
+ dma_desc->bytes_requested = 0;
+ dma_desc->bytes_transferred = 0;
+
+ if ((len & 3) || (dest & 3) ||
+ len > tdc->tdma->chip_data->max_dma_count) {
+ dev_err(tdc2dev(tdc),
+ "Dma length/memory address is not supported\n");
+ kfree(dma_desc);
+ return NULL;
+ }
+
+ dma_desc->bytes_requested += len;
+ dma_desc->ch_regs.src_ptr = 0;
+ dma_desc->ch_regs.dst_ptr = dest;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
+ dma_desc->ch_regs.fixed_pattern = value;
+ /* Word count reg takes value as (N +1) words */
+ dma_desc->ch_regs.wcount = ((len - 4) >> 2);
+ dma_desc->ch_regs.csr = csr;
+ dma_desc->ch_regs.mmio_seq = 0;
+ dma_desc->ch_regs.mc_seq = mc_seq;
+
+ tdc->dma_desc = dma_desc;
+
+ return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
+}
+
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_dma_memcpy(struct dma_chan *dc, dma_addr_t dest,
+ dma_addr_t src, size_t len, unsigned long flags)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_desc *dma_desc;
+ unsigned long csr, mc_seq;
+
+ /* Set dma mode to memory to memory transfer */
+ csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
+ /* Enable once or continuous mode */
+ csr |= TEGRA_GPCDMA_CSR_ONCE;
+ /* Enable IRQ mask */
+ csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
+ /* Enable the dma interrupt */
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_GPCDMA_CSR_IE_EOC;
+ /* Configure default priority weight for the channel */
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
+
+ mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+ /* retain stream-id and clean rest */
+ mc_seq &= (TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK) |
+ (TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
+
+ /* Set the address wrapping */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+
+ /* Program outstanding MC requests */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
+ /* Set burst size */
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
+
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+ if (!dma_desc)
+ return NULL;
+
+ dma_desc->bytes_requested = 0;
+ dma_desc->bytes_transferred = 0;
+
+ if ((len & 3) || (src & 3) || (dest & 3) ||
+ len > tdc->tdma->chip_data->max_dma_count) {
+ dev_err(tdc2dev(tdc),
+ "Dma length/memory address is not supported\n");
+ kfree(dma_desc);
+ return NULL;
+ }
+
+ dma_desc->bytes_requested += len;
+ dma_desc->ch_regs.src_ptr = src;
+ dma_desc->ch_regs.dst_ptr = dest;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (src >> 32));
+ dma_desc->ch_regs.high_addr_ptr |=
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
+ /* Word count reg takes value as (N +1) words */
+ dma_desc->ch_regs.wcount = ((len - 4) >> 2);
+ dma_desc->ch_regs.csr = csr;
+ dma_desc->ch_regs.mmio_seq = 0;
+ dma_desc->ch_regs.mc_seq = mc_seq;
+
+ return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
+}
+
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_slave_sg(struct dma_chan *dc, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long csr, mc_seq, apb_ptr = 0, mmio_seq = 0;
+ enum dma_slave_buswidth slave_bw;
+ struct tegra_dma_desc *dma_desc;
+ struct scatterlist *sg;
+ u32 burst_size;
+ unsigned int i;
+ int ret;
+
+ if (!tdc->config_init) {
+ dev_err(tdc2dev(tdc), "dma channel is not configured\n");
+ return NULL;
+ }
+ if (sg_len < 1) {
+ dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
+ return NULL;
+ }
+
+ ret = tegra_dma_reserve_sid(tdc, direction);
+ if (ret)
+ return NULL;
+
+ ret = get_transfer_param(tdc, direction, &apb_ptr, &mmio_seq, &csr,
+ &burst_size, &slave_bw);
+ if (ret < 0)
+ return NULL;
+
+ /* Enable once or continuous mode */
+ csr |= TEGRA_GPCDMA_CSR_ONCE;
+ /* Program the slave id in requestor select */
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, tdc->slave_id);
+ /* Enable IRQ mask */
+ csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
+ /* Configure default priority weight for the channel*/
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
+
+ /* Enable the dma interrupt */
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_GPCDMA_CSR_IE_EOC;
+
+ mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+ /* retain stream-id and clean rest */
+ mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
+
+ /* Set the address wrapping on both MC and MMIO side */
+
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mmio_seq |= FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD, 1);
+
+ /* Program 2 MC outstanding requests by default. */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
+
+ /* Setting MC burst size depending on MMIO burst size */
+ if (burst_size == 64)
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
+ else
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_2;
+
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+ if (!dma_desc)
+ return NULL;
+
+ dma_desc->bytes_requested = 0;
+ dma_desc->bytes_transferred = 0;
+
+ /* Make transfer requests */
+ for_each_sg(sgl, sg, sg_len, i) {
+ u32 len;
+ dma_addr_t mem;
+
+ mem = sg_dma_address(sg);
+ len = sg_dma_len(sg);
+
+ if ((len & 3) || (mem & 3) ||
+ len > tdc->tdma->chip_data->max_dma_count) {
+ dev_err(tdc2dev(tdc),
+ "Dma length/memory address is not supported\n");
+ kfree(dma_desc);
+ return NULL;
+ }
+
+ mmio_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
+ dma_desc->bytes_requested += len;
+
+ if (direction == DMA_MEM_TO_DEV) {
+ dma_desc->ch_regs.src_ptr = mem;
+ dma_desc->ch_regs.dst_ptr = apb_ptr;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (mem >> 32));
+ } else if (direction == DMA_DEV_TO_MEM) {
+ dma_desc->ch_regs.src_ptr = apb_ptr;
+ dma_desc->ch_regs.dst_ptr = mem;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (mem >> 32));
+ }
+
+ /*
+ * Word count register takes input in words. Writing a value
+ * of N into word count register means a req of (N+1) words.
+ */
+ dma_desc->ch_regs.wcount = ((len - 4) >> 2);
+ dma_desc->ch_regs.csr = csr;
+ dma_desc->ch_regs.mmio_seq = mmio_seq;
+ dma_desc->ch_regs.mc_seq = mc_seq;
+ tdc->dma_desc = dma_desc;
+ }
+
+ return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
+}
+
+static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ dma_cookie_init(&tdc->vc.chan);
+ tdc->config_init = false;
+ return 0;
+}
+
+static void tegra_dma_chan_synchronize(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ vchan_synchronize(&tdc->vc);
+}
+
+static void tegra_dma_free_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long flags;
+
+ dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
+
+ if (tdc->busy)
+ tegra_dma_terminate_all(dc);
+
+ tegra_dma_chan_synchronize(dc);
+
+ tasklet_kill(&tdc->vc.task);
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+ tdc->config_init = false;
+ tdc->slave_id = -1;
+ tdc->sid_reserved = false;
+ tdc->sid_dir = DMA_TRANS_NONE;
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+}
+
+static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct tegra_dma *tdma = ofdma->of_dma_data;
+ struct tegra_dma_channel *tdc;
+ struct dma_chan *chan;
+
+ chan = dma_get_any_slave_channel(&tdma->dma_dev);
+ if (!chan)
+ return NULL;
+
+ tdc = to_tegra_dma_chan(chan);
+ tdc->slave_id = dma_spec->args[0];
+
+ return chan;
+}
+
+static const struct tegra_dma_chip_data tegra186_dma_chip_data = {
+ .nr_channels = 31,
+ .channel_reg_size = SZ_64K,
+ .max_dma_count = SZ_1G,
+ .hw_support_pause = false,
+};
+
+static const struct tegra_dma_chip_data tegra194_dma_chip_data = {
+ .nr_channels = 31,
+ .channel_reg_size = SZ_64K,
+ .max_dma_count = SZ_1G,
+ .hw_support_pause = true,
+};
+
+static const struct of_device_id tegra_dma_of_match[] = {
+ {
+ .compatible = "nvidia,tegra186-gpcdma",
+ .data = &tegra186_dma_chip_data,
+ }, {
+ .compatible = "nvidia,tegra194-gpcdma",
+ .data = &tegra194_dma_chip_data,
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
+
+static int tegra_dma_program_sid(struct tegra_dma_channel *tdc,
+ int chan, int stream_id)
+{
+ unsigned int reg_val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+
+ reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK);
+ reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
+
+ reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK, stream_id);
+ reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK, stream_id);
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, reg_val);
+ return 0;
+}
+
+static int tegra_dma_probe(struct platform_device *pdev)
+{
+ const struct tegra_dma_chip_data *cdata = NULL;
+ struct iommu_fwspec *iommu_spec;
+ unsigned int stream_id, i;
+ struct tegra_dma *tdma;
+ struct resource *res;
+ int ret;
+
+ cdata = of_device_get_match_data(&pdev->dev);
+
+ tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
+ sizeof(struct tegra_dma_channel), GFP_KERNEL);
+ if (!tdma)
+ return -ENOMEM;
+
+ tdma->dev = &pdev->dev;
+ tdma->chip_data = cdata;
+ platform_set_drvdata(pdev, tdma);
+
+ tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(tdma->base_addr))
+ return PTR_ERR(tdma->base_addr);
+
+ tdma->rst = devm_reset_control_get_exclusive(&pdev->dev, "gpcdma");
+ if (IS_ERR(tdma->rst)) {
+ dev_err_probe(&pdev->dev, PTR_ERR(tdma->rst),
+ "Missing controller reset\n");
+ return PTR_ERR(tdma->rst);
+ }
+ reset_control_reset(tdma->rst);
+
+ tdma->dma_dev.dev = &pdev->dev;
+
+ iommu_spec = dev_iommu_fwspec_get(&pdev->dev);
+ if (!iommu_spec) {
+ dev_err(&pdev->dev, "Missing iommu stream-id\n");
+ return -EINVAL;
+ }
+ stream_id = iommu_spec->ids[0] & 0xffff;
+
+ INIT_LIST_HEAD(&tdma->dma_dev.channels);
+ for (i = 0; i < cdata->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ tdc->chan_base_offset = TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET +
+ i * cdata->channel_reg_size;
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+ if (!res) {
+ dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
+ return -EINVAL;
+ }
+ tdc->irq = res->start;
+ snprintf(tdc->name, sizeof(tdc->name), "gpcdma.%d", i);
+
+ tdc->tdma = tdma;
+ tdc->id = i;
+ tdc->slave_id = -1;
+
+ vchan_init(&tdc->vc, &tdma->dma_dev);
+ tdc->vc.desc_free = tegra_dma_desc_free;
+ raw_spin_lock_init(&tdc->lock);
+
+ /* program stream-id for this channel */
+ tegra_dma_program_sid(tdc, i, stream_id);
+ tdc->stream_id = stream_id;
+ }
+
+ dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_MEMCPY, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_MEMSET, tdma->dma_dev.cap_mask);
+
+ /*
+ * Only word aligned transfers are supported. Set the copy
+ * alignment shift.
+ */
+ tdma->dma_dev.copy_align = 2;
+ tdma->dma_dev.fill_align = 2;
+ tdma->dma_dev.device_alloc_chan_resources =
+ tegra_dma_alloc_chan_resources;
+ tdma->dma_dev.device_free_chan_resources =
+ tegra_dma_free_chan_resources;
+ tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
+ tdma->dma_dev.device_prep_dma_memcpy = tegra_dma_prep_dma_memcpy;
+ tdma->dma_dev.device_prep_dma_memset = tegra_dma_prep_dma_memset;
+ tdma->dma_dev.device_config = tegra_dma_slave_config;
+ tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all;
+ tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
+ tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
+ tdma->dma_dev.device_synchronize = tegra_dma_chan_synchronize;
+ tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+
+ /* Register DMA channel interrupt handlers after everything is setup */
+ for (i = 0; i < cdata->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ ret = devm_request_irq(&pdev->dev, tdc->irq,
+ tegra_dma_isr, 0, tdc->name, tdc);
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret,
+ "request_irq failed for channel %d\n", i);
+ return ret;
+ }
+ }
+
+ ret = dma_async_device_register(&tdma->dma_dev);
+ if (ret < 0) {
+ dev_err_probe(&pdev->dev, ret,
+ "GPC DMA driver registration failed\n");
+ return ret;
+ }
+
+ ret = of_dma_controller_register(pdev->dev.of_node,
+ tegra_dma_of_xlate, tdma);
+ if (ret < 0) {
+ dev_err_probe(&pdev->dev, ret,
+ "GPC DMA OF registration failed\n");
+
+ dma_async_device_unregister(&tdma->dma_dev);
+ return ret;
+ }
+
+ dev_info(&pdev->dev, "GPC DMA driver register %d channels\n",
+ cdata->nr_channels);
+
+ return 0;
+}
+
+static int tegra_dma_remove(struct platform_device *pdev)
+{
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+
+ of_dma_controller_free(pdev->dev.of_node);
+ dma_async_device_unregister(&tdma->dma_dev);
+
+ return 0;
+}
+
+/*
+ * Save and restore csr and channel register on pm_suspend
+ * and pm_resume respectively
+ */
+static int __maybe_unused tegra_dma_pm_suspend(struct device *dev)
+{
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
+ unsigned long flags;
+ unsigned int i;
+ bool busy;
+
+ for (i = 0; i < tdma->chip_data->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+ busy = tdc->busy;
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+
+ if (busy) {
+ dev_err(tdma->dev, "channel %u busy\n", i);
+ return -EBUSY;
+ }
+ }
+
+ return 0;
+}
+
+static int __maybe_unused tegra_dma_pm_resume(struct device *dev)
+{
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
+ unsigned int i;
+
+ reset_control_reset(tdma->rst);
+
+ for (i = 0; i < tdma->chip_data->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ tegra_dma_program_sid(tdc, i, tdc->stream_id);
+ }
+
+ return 0;
+}
+
+static const struct __maybe_unused dev_pm_ops tegra_dma_dev_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
+};
+
+static struct platform_driver tegra_dmac_driver = {
+ .driver = {
+ .name = "tegra-gpcdma",
+ .owner = THIS_MODULE,
+ .pm = &tegra_dma_dev_pm_ops,
+ .of_match_table = tegra_dma_of_match,
+ },
+ .probe = tegra_dma_probe,
+ .remove = tegra_dma_remove,
+};
+
+module_platform_driver(tegra_dmac_driver);
+
+MODULE_ALIAS("platform:tegra-gpc-dma");
+MODULE_DESCRIPTION("NVIDIA Tegra GPC DMA Controller driver");
+MODULE_AUTHOR("Pavan Kunapuli <pkunapuli@nvidia.com>");
+MODULE_AUTHOR("Rajesh Gumasta <rgumasta@nvidia.com>");
+MODULE_LICENSE("GPL v2");
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v6 3/4] arm64: defconfig: tegra: Enable GPCDMA
2021-09-17 14:11 [PATCH v6 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
2021-09-17 14:11 ` [PATCH v6 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
2021-09-17 14:11 ` [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
@ 2021-09-17 14:11 ` Akhil R
2021-09-17 14:11 ` [PATCH v6 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
2021-09-23 7:51 ` [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
4 siblings, 0 replies; 18+ messages in thread
From: Akhil R @ 2021-09-17 14:11 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Enable TEGRA_GPC_DMA in defconfig for Tegra186 and Tegra196 gpc
dma controller driver
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
arch/arm64/configs/defconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index f423d08..54770c8 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -930,6 +930,7 @@ CONFIG_OWL_DMA=y
CONFIG_PL330_DMA=y
CONFIG_TEGRA20_APB_DMA=y
CONFIG_TEGRA210_ADMA=m
+CONFIG_TEGRA186_GPC_DMA=m
CONFIG_QCOM_BAM_DMA=y
CONFIG_QCOM_HIDMA_MGMT=y
CONFIG_QCOM_HIDMA=y
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v6 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194
2021-09-17 14:11 [PATCH v6 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
` (2 preceding siblings ...)
2021-09-17 14:11 ` [PATCH v6 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
@ 2021-09-17 14:11 ` Akhil R
2021-09-23 7:51 ` [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
4 siblings, 0 replies; 18+ messages in thread
From: Akhil R @ 2021-09-17 14:11 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Add device tree node for GPCDMA controller on Tegra186 target
and Tegra194 target.
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi | 4 +++
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 44 ++++++++++++++++++++++++++
arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi | 4 +++
arch/arm64/boot/dts/nvidia/tegra194.dtsi | 44 ++++++++++++++++++++++++++
4 files changed, 96 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
index fcd71bf..71dd10e 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
@@ -56,6 +56,10 @@
};
};
+ dma@2600000 {
+ status = "okay";
+ };
+
memory-controller@2c00000 {
status = "okay";
};
diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
index d02f6bf..3f9c4c4 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
@@ -73,6 +73,50 @@
snps,rxpbl = <8>;
};
+ gpcdma: dma@2600000 {
+ compatible = "nvidia,tegra186-gpcdma";
+ reg = <0x2600000 0x210000>;
+ resets = <&bpmp TEGRA186_RESET_GPCDMA>;
+ reset-names = "gpcdma";
+ interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
+ dma-coherent;
+ status = "disabled";
+ };
+
aconnect@2900000 {
compatible = "nvidia,tegra186-aconnect",
"nvidia,tegra210-aconnect";
diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
index 7e7b0eb..2d4ead1 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
@@ -49,6 +49,10 @@
};
};
+ dma@2600000 {
+ status = "okay";
+ };
+
memory-controller@2c00000 {
status = "okay";
};
diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
index b7d5328..3ce4b8d 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
@@ -72,6 +72,50 @@
snps,rxpbl = <8>;
};
+ gpcdma: dma@2600000 {
+ compatible = "nvidia,tegra194-gpcdma";
+ reg = <0x2600000 0x210000>;
+ resets = <&bpmp TEGRA194_RESET_GPCDMA>;
+ reset-names = "gpcdma";
+ interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ iommus = <&smmu TEGRA194_SID_GPCDMA_0>;
+ dma-coherent;
+ status = "disabled";
+ };
+
aconnect@2900000 {
compatible = "nvidia,tegra194-aconnect",
"nvidia,tegra210-aconnect";
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* Re: [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-17 14:11 ` [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
@ 2021-09-17 15:36 ` Jon Hunter
2021-09-22 14:46 ` Akhil R
0 siblings, 1 reply; 18+ messages in thread
From: Jon Hunter @ 2021-09-17 15:36 UTC (permalink / raw)
To: Akhil R
Cc: dan.j.williams, dmaengine, kyarlagadda, ldewangan, linux-kernel,
linux-tegra, p.zabel, rgumasta, thierry.reding, vkoul,
Pavan Kunapuli
On 17/09/2021 15:11, Akhil R wrote:
> Adding GPC DMA controller driver for Tegra186 and Tegra194. The driver
> supports dma transfers between memory to memory, IO peripheral to memory
> and memory to IO peripheral.
>
> Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
> Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
> Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
> ---
> drivers/dma/Kconfig | 12 +
> drivers/dma/Makefile | 1 +
> drivers/dma/tegra186-gpc-dma.c | 1375 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1388 insertions(+)
> create mode 100644 drivers/dma/tegra186-gpc-dma.c
...
> +static int tegra_dma_slave_config(struct dma_chan *dc,
> + struct dma_slave_config *sconfig)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> +
> + if (tdc->dma_desc) {
> + dev_err(tdc2dev(tdc), "Configuration not allowed\n");
> + return -EBUSY;
> + }
> +
> + memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
> + if (tdc->slave_id == -1)
> + tdc->slave_id = sconfig->slave_id;
> +
> + tdc->config_init = true;
> + return 0;
> +}
So you have a function to reserve a slave ID, but you don't check here
if it is already reserved.
> +
> +static int tegra_dma_pause(struct tegra_dma_channel *tdc)
> +{
> + u32 val;
> + int ret;
> +
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, TEGRA_GPCDMA_CHAN_CSRE_PAUSE);
> +
> + /* Wait until busy bit is de-asserted */
> + ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
> + tdc->chan_base_offset + TEGRA_GPCDMA_CHAN_STATUS,
> + val,
> + !(val & TEGRA_GPCDMA_STATUS_BUSY),
> + TEGRA_GPCDMA_BURST_COMPLETE_TIME,
> + TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
> +
> + if (ret)
> + dev_err(tdc2dev(tdc), "DMA pause timed out\n");
> +
> + return ret;
> +}
> +
> +static void tegra_dma_stop(struct tegra_dma_channel *tdc)
> +{
> + u32 csr, status;
> +
> + csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
> +
> + /* Disable interrupts */
> + csr &= ~TEGRA_GPCDMA_CSR_IE_EOC;
> +
> + /* Disable DMA */
> + csr &= ~TEGRA_GPCDMA_CSR_ENB;
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
> +
> + /* Clear interrupt status if it is there */
> + status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
> + if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
> + dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS, status);
> + }
> + tdc->busy = false;
> +}
> +
> +static void tegra_dma_start(struct tegra_dma_channel *tdc)
> +{
> + struct tegra_dma_channel_regs *ch_regs;
> + struct virt_dma_desc *vdesc;
> +
> + if (tdc->busy)
> + return;
> +
> + vdesc = vchan_next_desc(&tdc->vc);
> + if (!vdesc)
> + return;
> +
> + tdc->dma_desc = vd_to_tegra_dma_desc(vdesc);
> + if (!tdc->dma_desc)
> + return;
> +
> + list_del(&vdesc->node);
> +
> + tdc->dma_desc->tdc = tdc;
> + ch_regs = &tdc->dma_desc->ch_regs;
> +
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_regs->wcount);
> +
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, 0);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_regs->src_ptr);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_regs->dst_ptr);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR, ch_regs->high_addr_ptr);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_FIXED_PATTERN, ch_regs->fixed_pattern);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ, ch_regs->mmio_seq);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, ch_regs->mc_seq);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, 0);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, ch_regs->csr);
> +
> + /* Start DMA */
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
> + ch_regs->csr | TEGRA_GPCDMA_CSR_ENB);
> +
> + tdc->busy = true;
> +}
> +
> +static void tegra_dma_sid_free(struct tegra_dma_channel *tdc)
> +{
> + struct tegra_dma *tdma = tdc->tdma;
> + unsigned int sid = tdc->slave_id;
> +
> + switch (tdc->sid_dir) {
> + case DMA_MEM_TO_DEV:
> + clear_bit(sid, &tdma->sid_m2d_reserved);
> + break;
> + case DMA_DEV_TO_MEM:
> + clear_bit(sid, &tdma->sid_d2m_reserved);
> + break;
> + case DMA_MEM_TO_MEM:
> + clear_bit(sid, &tdma->sid_m2m_reserved);
> + break;
> + }
> +
> + tdc->sid_reserved = false;
> + tdc->sid_dir = DMA_TRANS_NONE;
> +}
I would keep the tegra_dma_reserve_sid() and tegra_dma_sid_free()
together. I would also be consistent in the naming and have
tegra_dma_sid_reserve/free().
> +static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
> +{
> + tegra_dma_sid_free(tdc);
> + kfree(tdc->dma_desc);
> +}
> +
> +static void tegra_dma_isr_callback(struct tegra_dma_channel *tdc,
> + bool to_terminate)
Is it more appropriate to call this tegra_dma_xfer_complete() or
something because this is also called from the terminate function?
> +{
> + struct tegra_dma_desc *dma_desc;
> +
> + tdc->busy = false;
> + dma_desc = tdc->dma_desc;
> + dma_desc->bytes_transferred += dma_desc->bytes_requested;
> +
> + vchan_cookie_complete(&tdc->dma_desc->vd);
> +
> + if (to_terminate)
> + return;
> +
> + tegra_dma_start(tdc);
I would be tempted to move this out of this function and call this in
the ISR then you can remove the 'to_terminate' variable.
> +}
> +
> +static void tegra_dma_chan_decode_error(struct tegra_dma_channel *tdc,
> + unsigned int err_status)
> +{
> + switch (TEGRA_GPCDMA_CHAN_ERR_TYPE(err_status)) {
> + case TEGRA_DMA_BM_FIFO_FULL_ERR:
> + dev_err(tdc->tdma->dev,
> + "GPCDMA CH%d bm fifo full\n", tdc->id);
> + break;
> +
> + case TEGRA_DMA_PERIPH_FIFO_FULL_ERR:
> + dev_err(tdc->tdma->dev,
> + "GPCDMA CH%d peripheral fifo full\n", tdc->id);
> + break;
> +
> + case TEGRA_DMA_PERIPH_ID_ERR:
> + dev_err(tdc->tdma->dev,
> + "GPCDMA CH%d illegal peripheral id\n", tdc->id);
> + break;
> +
> + case TEGRA_DMA_STREAM_ID_ERR:
> + dev_err(tdc->tdma->dev,
> + "GPCDMA CH%d illegal stream id\n", tdc->id);
> + break;
> +
> + case TEGRA_DMA_MC_SLAVE_ERR:
> + dev_err(tdc->tdma->dev,
> + "GPCDMA CH%d mc slave error\n", tdc->id);
> + break;
> +
> + case TEGRA_DMA_MMIO_SLAVE_ERR:
> + dev_err(tdc->tdma->dev,
> + "GPCDMA CH%d mmio slave error\n", tdc->id);
> + break;
> +
> + default:
> + dev_err(tdc->tdma->dev,
> + "GPCDMA CH%d security violation %x\n", tdc->id,
> + err_status);
> + }
> +}
> +
> +static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
> +{
> + struct tegra_dma_channel *tdc = dev_id;
> + irqreturn_t ret = IRQ_NONE;
> + unsigned int err_status;
> + unsigned long status;
err_status is an unsigned int and status is an unsigned long. tdc_read()
returns a u32 and so shouldn't these be u32? Do we need two variables?
> +
> + raw_spin_lock(&tdc->lock);
> +
> + status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
> + err_status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS);
> +
> + if (err_status) {
> + tegra_dma_chan_decode_error(tdc, err_status);
> + tegra_dma_dump_chan_regs(tdc);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS, 0xFFFFFFFF);
> + }
> +
> + if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS,
> + TEGRA_GPCDMA_STATUS_ISE_EOC);
> + tegra_dma_isr_callback(tdc, false);
> +
> + ret = IRQ_HANDLED;
> + }
> +
> + raw_spin_unlock(&tdc->lock);
> + return ret;
> +}
> +
> +static void tegra_dma_issue_pending(struct dma_chan *dc)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + unsigned long flags;
> +
> + raw_spin_lock_irqsave(&tdc->lock, flags);
> +
> + if (!tdc->busy)
> + if (vchan_issue_pending(&tdc->vc))
> + tegra_dma_start(tdc);
> +
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> +}
> +
> +static void tegra_dma_reset_client(struct tegra_dma_channel *tdc)
> +{
> + u32 csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
> +
> + csr &= ~(TEGRA_GPCDMA_CSR_REQ_SEL_MASK);
> + csr |= TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED;
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
> +}
> +
> +static void tegra_dma_stop_client(struct tegra_dma_channel *tdc)
Why not return the error code from this function?
> +{
> + int ret;
> + unsigned long status;
> +
> + /* Before Reading DMA status to figure out number
> + * of bytes transferred by DMA channel:
> + * Change the client associated with the DMA channel
> + * to stop DMA engine from starting any more bursts for
> + * the given client and wait for in flight bursts to complete
> + */
> + tegra_dma_reset_client(tdc);
> +
> + /* Wait for in flight data transfer to finish */
> + udelay(TEGRA_GPCDMA_BURST_COMPLETE_TIME);
> +
> + /* If TX/RX path is still active wait till it becomes
> + * inactive
> + */
> +
> + ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
> + tdc->chan_base_offset +
> + TEGRA_GPCDMA_CHAN_STATUS,
> + status,
> + !(status & (TEGRA_GPCDMA_STATUS_CHANNEL_TX |
> + TEGRA_GPCDMA_STATUS_CHANNEL_RX)),
> + 5,
> + TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
> + if (ret) {
> + dev_err(tdc2dev(tdc), "Timeout waiting for DMA burst completion!\n");
> + tegra_dma_dump_chan_regs(tdc);
> + }
> +}
> +
> +static int tegra_dma_terminate_all(struct dma_chan *dc)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + unsigned long wcount = 0;
> + unsigned long status;
> + unsigned long flags;
> + bool was_busy;
> + int err;
> +
> + raw_spin_lock_irqsave(&tdc->lock, flags);
> +
> + if (!tdc->dma_desc) {
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> + return 0;
> + }
> +
> + if (!tdc->busy)
> + goto skip_dma_stop;
> +
> + if (tdc->tdma->chip_data->hw_support_pause) {
> + err = tegra_dma_pause(tdc);
> + if (err) {
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> + return err;
> + }
> + } else {
> + tegra_dma_stop_client(tdc);
> + }
> +
> + status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
> + wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT);
> + if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
> + dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
> + tegra_dma_isr_callback(tdc, true);
> + status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
> + wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT);
Is it necessary to read the XFER_COUNT twice?
> + }
> +
> + was_busy = tdc->busy;
Isn't this always true? Otherwise we go to skip_dma_stop?
> +
> + tegra_dma_stop(tdc);
> + if (tdc->dma_desc && was_busy)
> + tdc->dma_desc->bytes_transferred +=
> + tdc->dma_desc->bytes_requested - (wcount * 4);
> +
> +skip_dma_stop:
> + tegra_dma_abort_all(tdc);
Do we need this function tegra_dma_abort_all()? I would inline the code.
> + vchan_free_chan_resources(&tdc->vc);
> +
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> + return 0;
> +}
> +
> +static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
> + dma_cookie_t cookie,
> + struct dma_tx_state *txstate)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + struct tegra_dma_desc *dma_desc = NULL;
> + struct virt_dma_desc *vd;
> + unsigned int residual;
> + enum dma_status ret;
> + unsigned long flags;
> +
> + raw_spin_lock_irqsave(&tdc->lock, flags);
> +
> + ret = dma_cookie_status(dc, cookie, txstate);
> + if (ret == DMA_COMPLETE) {
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> + return ret;
> + }
> +
> + vd = vchan_find_desc(&tdc->vc, cookie);
> + if (vd)
> + dma_desc = vd_to_tegra_dma_desc(vd);
> +
> + if (dma_desc) {
> + residual = dma_desc->bytes_requested -
> + (dma_desc->bytes_transferred %
> + dma_desc->bytes_requested);
> + dma_set_residue(txstate, residual);
> + kfree(dma_desc);
> + } else {
> + dev_err(tdc2dev(tdc), "cookie %d is not found\n", cookie);
What about the case where the vchan_find_desc() return NULL, but the
descriptor is in progress? Looking at the above this will be flagged as
an error. See the tegra210-adma.c driver.
> + }
> +
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> + return ret;
> +}
> +
> +static inline int get_bus_width(struct tegra_dma_channel *tdc,
> + enum dma_slave_buswidth slave_bw)
> +{
> + switch (slave_bw) {
> + case DMA_SLAVE_BUSWIDTH_1_BYTE:
> + return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8;
> + case DMA_SLAVE_BUSWIDTH_2_BYTES:
> + return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16;
> + case DMA_SLAVE_BUSWIDTH_4_BYTES:
> + return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32;
> + default:
> + dev_err(tdc2dev(tdc), "given slave bw is not supported\n");
'bw' usually implies bandwidth. This is bus width and so maybe say 'Bus
width is not supported'.
> + return -EINVAL;
> + }
> +}
> +
> +static inline int get_burst_size_by_len(int len)
> +{
> + int ret;
> +
> + switch (len) {
> + case BIT(0) ... BIT(2):
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
> + break;
> + case BIT(3):
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
> + break;
> + case BIT(4):
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
> + break;
> + case BIT(5):
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
> + break;
> + default:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
> + break;
> + }
> +
> + return ret;
> +}
> +
> +static inline int get_burst_size(struct tegra_dma_channel *tdc,
> + u32 burst_size,
> + enum dma_slave_buswidth slave_bw,
> + int len)
> +{
> + int burst_mmio_width, burst_byte, ret;
> +
> + /*
> + * burst_size from client is in terms of the bus_width.
> + * convert that into words.
> + */
> + burst_byte = burst_size * slave_bw;
> + burst_mmio_width = burst_byte / 4;
> +
> + switch (burst_mmio_width) {
> + case 0:
> + ret = get_burst_size_by_len(len);
> + break;
> + case 1:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
> + break;
> + case 2 ... 3:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
> + break;
> + case 4 ... 7:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
> + break;
> + case 8 ... 15:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
> + break;
> + default:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
> + break;
> + }
> +
> + return ret;
> +}
This seems very complicated. I wonder if there is a way to simplify all
of this?
> +
> +static int tegra_dma_reserve_sid(struct tegra_dma_channel *tdc,
> + enum dma_transfer_direction direction)
> +{
> + struct tegra_dma *tdma = tdc->tdma;
> + unsigned int sid = tdc->slave_id;
> +
> + if (tdc->sid_reserved)
> + return tdc->sid_dir == direction ? 0 : -EINVAL;
Is this really necessary? The slave ID should be reserved at channel
allocation time and freed when the channel is freed.
> +
> + switch (direction) {
> + case DMA_MEM_TO_DEV:
> + if (test_and_set_bit(sid, &tdma->sid_m2d_reserved)) {
> + dev_err(tdma->dev, "slave id already in use\n");
> + return -EINVAL;
> + }
> + break;
> + case DMA_DEV_TO_MEM:
> + if (test_and_set_bit(sid, &tdma->sid_d2m_reserved)) {
> + dev_err(tdma->dev, "slave id already in use\n");
> + return -EINVAL;
> + }
> + break;
> + case DMA_MEM_TO_MEM:
> + if (test_and_set_bit(sid, &tdma->sid_m2m_reserved)) {
> + dev_err(tdma->dev, "slave id already in use\n");
> + return -EINVAL;
> + }
Do we need slave IDs for memory to memory transfers? Maybe there are
cases, but there are probably other cases where we do not need one and
want the transfer to be performed immediately.
> + break;
> + }
> +
> + tdc->sid_reserved = true;
> + tdc->sid_dir = direction;
> +
> + return 0;
> +}
> +
> +static int get_transfer_param(struct tegra_dma_channel *tdc,
> + enum dma_transfer_direction direction,
> + unsigned long *apb_addr,
> + unsigned long *mmio_seq,
> + unsigned long *csr,
> + unsigned int *burst_size,
> + enum dma_slave_buswidth *slave_bw)
> +{
> + switch (direction) {
> + case DMA_MEM_TO_DEV:
> + *apb_addr = tdc->dma_sconfig.dst_addr;
> + *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
> + *burst_size = tdc->dma_sconfig.dst_maxburst;
> + *slave_bw = tdc->dma_sconfig.dst_addr_width;
> + *csr = TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC;
> + return 0;
> + case DMA_DEV_TO_MEM:
> + *apb_addr = tdc->dma_sconfig.src_addr;
> + *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
> + *burst_size = tdc->dma_sconfig.src_maxburst;
> + *slave_bw = tdc->dma_sconfig.src_addr_width;
> + *csr = TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC;
> + return 0;
> + case DMA_MEM_TO_MEM:
> + *burst_size = tdc->dma_sconfig.src_addr_width;
> + *csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
> + return 0;
> + default:
> + dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
s/Dma/DMA
> + return -EINVAL;
This return is not needed.
> + }
> + return -EINVAL;
> +}
> +
> +static struct dma_async_tx_descriptor *
> +tegra_dma_prep_dma_memset(struct dma_chan *dc, dma_addr_t dest, int value,
> + size_t len, unsigned long flags)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + struct tegra_dma_desc *dma_desc;
> + unsigned long csr, mc_seq;
> +
> + /* Set dma mode to fixed pattern */
> + csr = TEGRA_GPCDMA_CSR_DMA_FIXED_PAT;
> + /* Enable once or continuous mode */
> + csr |= TEGRA_GPCDMA_CSR_ONCE;
> + /* Enable IRQ mask */
> + csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
> + /* Enable the dma interrupt */
> + if (flags & DMA_PREP_INTERRUPT)
> + csr |= TEGRA_GPCDMA_CSR_IE_EOC;
> + /* Configure default priority weight for the channel */
> + csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
> +
> + mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
> + /* retain stream-id and clean rest */
> + mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
> +
> + /* Set the address wrapping */
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
> + TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
> + TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
> +
> + /* Program outstanding MC requests */
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
> + /* Set burst size */
> + mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
> +
> + dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
> + if (!dma_desc)
> + return NULL;
> +
> + dma_desc->bytes_requested = 0;
> + dma_desc->bytes_transferred = 0;
> +
> + if ((len & 3) || (dest & 3) ||
> + len > tdc->tdma->chip_data->max_dma_count) {
Why not check this before allocating the memory? Seems that we should do
this at the beginning of the function.
> + dev_err(tdc2dev(tdc),
> + "Dma length/memory address is not supported\n");
s/Dma/DMA
> + kfree(dma_desc);
> + return NULL;
> + }
> +
> + dma_desc->bytes_requested += len;
> + dma_desc->ch_regs.src_ptr = 0;
> + dma_desc->ch_regs.dst_ptr = dest;
> + dma_desc->ch_regs.high_addr_ptr =
> + FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
> + dma_desc->ch_regs.fixed_pattern = value;
> + /* Word count reg takes value as (N +1) words */
> + dma_desc->ch_regs.wcount = ((len - 4) >> 2);
> + dma_desc->ch_regs.csr = csr;
> + dma_desc->ch_regs.mmio_seq = 0;
> + dma_desc->ch_regs.mc_seq = mc_seq;
> +
> + tdc->dma_desc = dma_desc;
> +
> + return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
> +}
> +
> +static struct dma_async_tx_descriptor *
> +tegra_dma_prep_dma_memcpy(struct dma_chan *dc, dma_addr_t dest,
> + dma_addr_t src, size_t len, unsigned long flags)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + struct tegra_dma_desc *dma_desc;
> + unsigned long csr, mc_seq;
> +
> + /* Set dma mode to memory to memory transfer */
> + csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
> + /* Enable once or continuous mode */
> + csr |= TEGRA_GPCDMA_CSR_ONCE;
> + /* Enable IRQ mask */
> + csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
> + /* Enable the dma interrupt */
> + if (flags & DMA_PREP_INTERRUPT)
> + csr |= TEGRA_GPCDMA_CSR_IE_EOC;
> + /* Configure default priority weight for the channel */
> + csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
> +
> + mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
> + /* retain stream-id and clean rest */
> + mc_seq &= (TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK) |
> + (TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
> +
> + /* Set the address wrapping */
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
> + TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
> + TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
> +
> + /* Program outstanding MC requests */
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
> + /* Set burst size */
> + mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
> +
> + dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
> + if (!dma_desc)
> + return NULL;
> +
> + dma_desc->bytes_requested = 0;
> + dma_desc->bytes_transferred = 0;
> +
> + if ((len & 3) || (src & 3) || (dest & 3) ||
> + len > tdc->tdma->chip_data->max_dma_count) {
Same here.
> + dev_err(tdc2dev(tdc),
> + "Dma length/memory address is not supported\n");
> + kfree(dma_desc);
> + return NULL;
> + }
> +
> + dma_desc->bytes_requested += len;
> + dma_desc->ch_regs.src_ptr = src;
> + dma_desc->ch_regs.dst_ptr = dest;
> + dma_desc->ch_regs.high_addr_ptr =
> + FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (src >> 32));
> + dma_desc->ch_regs.high_addr_ptr |=
> + FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
> + /* Word count reg takes value as (N +1) words */
> + dma_desc->ch_regs.wcount = ((len - 4) >> 2);
> + dma_desc->ch_regs.csr = csr;
> + dma_desc->ch_regs.mmio_seq = 0;
> + dma_desc->ch_regs.mc_seq = mc_seq;
> +
> + return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
> +}
> +
> +static struct dma_async_tx_descriptor *
> +tegra_dma_prep_slave_sg(struct dma_chan *dc, struct scatterlist *sgl,
> + unsigned int sg_len, enum dma_transfer_direction direction,
> + unsigned long flags, void *context)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + unsigned long csr, mc_seq, apb_ptr = 0, mmio_seq = 0;
> + enum dma_slave_buswidth slave_bw;
> + struct tegra_dma_desc *dma_desc;
> + struct scatterlist *sg;
> + u32 burst_size;
> + unsigned int i;
> + int ret;
> +
> + if (!tdc->config_init) {
> + dev_err(tdc2dev(tdc), "dma channel is not configured\n");
> + return NULL;
> + }
> + if (sg_len < 1) {
> + dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
> + return NULL;
> + }
> +
> + ret = tegra_dma_reserve_sid(tdc, direction);
> + if (ret)
> + return NULL;
> +
> + ret = get_transfer_param(tdc, direction, &apb_ptr, &mmio_seq, &csr,
> + &burst_size, &slave_bw);
> + if (ret < 0)
> + return NULL;
> +
> + /* Enable once or continuous mode */
> + csr |= TEGRA_GPCDMA_CSR_ONCE;
> + /* Program the slave id in requestor select */
> + csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, tdc->slave_id);
> + /* Enable IRQ mask */
> + csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
> + /* Configure default priority weight for the channel*/
> + csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
> +
> + /* Enable the dma interrupt */
> + if (flags & DMA_PREP_INTERRUPT)
> + csr |= TEGRA_GPCDMA_CSR_IE_EOC;
> +
> + mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
> + /* retain stream-id and clean rest */
> + mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
> +
> + /* Set the address wrapping on both MC and MMIO side */
> +
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
> + TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
> + TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
> + mmio_seq |= FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD, 1);
> +
> + /* Program 2 MC outstanding requests by default. */
> + mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
> +
> + /* Setting MC burst size depending on MMIO burst size */
> + if (burst_size == 64)
> + mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
> + else
> + mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_2;
> +
> + dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
> + if (!dma_desc)
> + return NULL;
> +
> + dma_desc->bytes_requested = 0;
> + dma_desc->bytes_transferred = 0;
> +
> + /* Make transfer requests */
> + for_each_sg(sgl, sg, sg_len, i) {
> + u32 len;
> + dma_addr_t mem;
> +
> + mem = sg_dma_address(sg);
> + len = sg_dma_len(sg);
> +
> + if ((len & 3) || (mem & 3) ||
> + len > tdc->tdma->chip_data->max_dma_count) {
> + dev_err(tdc2dev(tdc),
> + "Dma length/memory address is not supported\n");
> + kfree(dma_desc);
> + return NULL;
> + }
> +
> + mmio_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
> + dma_desc->bytes_requested += len;
> +
> + if (direction == DMA_MEM_TO_DEV) {
> + dma_desc->ch_regs.src_ptr = mem;
> + dma_desc->ch_regs.dst_ptr = apb_ptr;
> + dma_desc->ch_regs.high_addr_ptr =
> + FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (mem >> 32));
> + } else if (direction == DMA_DEV_TO_MEM) {
> + dma_desc->ch_regs.src_ptr = apb_ptr;
> + dma_desc->ch_regs.dst_ptr = mem;
> + dma_desc->ch_regs.high_addr_ptr =
> + FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (mem >> 32));
> + }
> +
> + /*
> + * Word count register takes input in words. Writing a value
> + * of N into word count register means a req of (N+1) words.
> + */
> + dma_desc->ch_regs.wcount = ((len - 4) >> 2);
> + dma_desc->ch_regs.csr = csr;
> + dma_desc->ch_regs.mmio_seq = mmio_seq;
> + dma_desc->ch_regs.mc_seq = mc_seq;
> + tdc->dma_desc = dma_desc;
> + }
> +
> + return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
> +}
> +
> +static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> +
> + dma_cookie_init(&tdc->vc.chan);
> + tdc->config_init = false;
> + return 0;
> +}
> +
> +static void tegra_dma_chan_synchronize(struct dma_chan *dc)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> +
> + vchan_synchronize(&tdc->vc);
> +}
> +
> +static void tegra_dma_free_chan_resources(struct dma_chan *dc)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + unsigned long flags;
> +
> + dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
> +
> + if (tdc->busy)
Do you need to check this?
> + tegra_dma_terminate_all(dc);
> +
> + tegra_dma_chan_synchronize(dc);
> +
> + tasklet_kill(&tdc->vc.task);
> + raw_spin_lock_irqsave(&tdc->lock, flags);
> + tdc->config_init = false;
> + tdc->slave_id = -1;
> + tdc->sid_reserved = false;
> + tdc->sid_dir = DMA_TRANS_NONE;
> +
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> +}
> +
> +static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
> + struct of_dma *ofdma)
> +{
> + struct tegra_dma *tdma = ofdma->of_dma_data;
> + struct tegra_dma_channel *tdc;
> + struct dma_chan *chan;
> +
> + chan = dma_get_any_slave_channel(&tdma->dma_dev);
> + if (!chan)
> + return NULL;
> +
> + tdc = to_tegra_dma_chan(chan);
> + tdc->slave_id = dma_spec->args[0];
> +
> + return chan;
> +}
> +
> +static const struct tegra_dma_chip_data tegra186_dma_chip_data = {
> + .nr_channels = 31,
> + .channel_reg_size = SZ_64K,
> + .max_dma_count = SZ_1G,
> + .hw_support_pause = false,
> +};
> +
> +static const struct tegra_dma_chip_data tegra194_dma_chip_data = {
> + .nr_channels = 31,
> + .channel_reg_size = SZ_64K,
> + .max_dma_count = SZ_1G,
> + .hw_support_pause = true,
> +};
> +
> +static const struct of_device_id tegra_dma_of_match[] = {
> + {
> + .compatible = "nvidia,tegra186-gpcdma",
> + .data = &tegra186_dma_chip_data,
> + }, {
> + .compatible = "nvidia,tegra194-gpcdma",
> + .data = &tegra194_dma_chip_data,
> + }, {
> + },
> +};
> +MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
> +
> +static int tegra_dma_program_sid(struct tegra_dma_channel *tdc,
> + int chan, int stream_id)
> +{
> + unsigned int reg_val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
> +
> + reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK);
> + reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
> +
> + reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK, stream_id);
> + reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK, stream_id);
> +
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, reg_val);
> + return 0;
> +}
> +
> +static int tegra_dma_probe(struct platform_device *pdev)
> +{
> + const struct tegra_dma_chip_data *cdata = NULL;
> + struct iommu_fwspec *iommu_spec;
> + unsigned int stream_id, i;
> + struct tegra_dma *tdma;
> + struct resource *res;
> + int ret;
> +
> + cdata = of_device_get_match_data(&pdev->dev);
> +
> + tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
> + sizeof(struct tegra_dma_channel), GFP_KERNEL);
> + if (!tdma)
> + return -ENOMEM;
> +
> + tdma->dev = &pdev->dev;
> + tdma->chip_data = cdata;
> + platform_set_drvdata(pdev, tdma);
> +
> + tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(tdma->base_addr))
> + return PTR_ERR(tdma->base_addr);
> +
> + tdma->rst = devm_reset_control_get_exclusive(&pdev->dev, "gpcdma");
> + if (IS_ERR(tdma->rst)) {
> + dev_err_probe(&pdev->dev, PTR_ERR(tdma->rst),
> + "Missing controller reset\n");
> + return PTR_ERR(tdma->rst);
> + }
> + reset_control_reset(tdma->rst);
> +
> + tdma->dma_dev.dev = &pdev->dev;
> +
> + iommu_spec = dev_iommu_fwspec_get(&pdev->dev);
> + if (!iommu_spec) {
> + dev_err(&pdev->dev, "Missing iommu stream-id\n");
> + return -EINVAL;
> + }
> + stream_id = iommu_spec->ids[0] & 0xffff;
Is it an error if the ID is greater than 0xffff?
Jon
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
* RE: [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-17 15:36 ` Jon Hunter
@ 2021-09-22 14:46 ` Akhil R
2021-09-23 12:22 ` Jon Hunter
0 siblings, 1 reply; 18+ messages in thread
From: Akhil R @ 2021-09-22 14:46 UTC (permalink / raw)
To: Jonathan Hunter
Cc: dan.j.williams, dmaengine, Krishna Yarlagadda, Laxman Dewangan,
linux-kernel, linux-tegra, p.zabel, Rajesh Gumasta,
thierry.reding, vkoul, Pavan Kunapuli
> On 17/09/2021 15:11, Akhil R wrote:
> > +static int tegra_dma_slave_config(struct dma_chan *dc,
> > + struct dma_slave_config *sconfig) {
> > + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> > +
> > + if (tdc->dma_desc) {
> > + dev_err(tdc2dev(tdc), "Configuration not allowed\n");
> > + return -EBUSY;
> > + }
> > +
> > + memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
> > + if (tdc->slave_id == -1)
> > + tdc->slave_id = sconfig->slave_id;
> > +
> > + tdc->config_init = true;
> > + return 0;
> > +}
>
> So you have a function to reserve a slave ID, but you don't check here if it is
> already reserved.
slave-id is reserved considering the direction as well.
'direction' is available only during prep_slave_sg function, I guess.
>
> ...
>
> > +
> > + iommu_spec = dev_iommu_fwspec_get(&pdev->dev);
> > + if (!iommu_spec) {
> > + dev_err(&pdev->dev, "Missing iommu stream-id\n");
> > + return -EINVAL;
> > + }
> > + stream_id = iommu_spec->ids[0] & 0xffff;
>
> Is it an error if the ID is greater than 0xffff?
The value should correspond to one of the GPC DMA Clients listed in
include/dt-bindings/memory/tegra186-mc.h.
I saw similar masking in other tegra drivers also for stream-id.
Would add fixes for other comments in the next version.
Thanks,
Akhil
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver
2021-09-17 14:11 [PATCH v6 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
` (3 preceding siblings ...)
2021-09-17 14:11 ` [PATCH v6 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
@ 2021-09-23 7:51 ` Akhil R
2021-09-23 7:51 ` [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
` (3 more replies)
4 siblings, 4 replies; 18+ messages in thread
From: Akhil R @ 2021-09-23 7:51 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Add support for Nvida Tegra general purpose DMA driver for
Tegra186 and Tegra194 platform.
Changes in patch v7:
* changed function name / position changes for consistency.
* moved tegra_dma_start to isr and removed to_terminate flag.
* Updates in register reads, variables and checks based
on comments in v6.
* Corrections in prints as per comments in v6
* Updated the logic to get dma burst size
* Handled the case where the vchan_find_desc() return NULL, but the
descriptor is in progress
v6 - https://lkml.org/lkml/2021/9/17/652
v2..v5 - https://lkml.org/lkml/2021/9/16/455
v1 - https://lkml.org/lkml/2020/7/20/96
Akhil R (4):
dt-bindings: dmaengine: Add doc for tegra gpcdma
dmaengine: tegra: Add tegra gpcdma driver
arm64: defconfig: tegra: Enable GPCDMA
arm64: tegra: Add GPCDMA node for tegra186 and tegra194
.../bindings/dma/nvidia,tegra186-gpc-dma.yaml | 98 ++
arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi | 4 +
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 44 +
arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi | 4 +
arch/arm64/boot/dts/nvidia/tegra194.dtsi | 44 +
arch/arm64/configs/defconfig | 1 +
drivers/dma/Kconfig | 12 +
drivers/dma/Makefile | 1 +
drivers/dma/tegra186-gpc-dma.c | 1354 ++++++++++++++++++++
9 files changed, 1562 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
create mode 100644 drivers/dma/tegra186-gpc-dma.c
--
2.7.4
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma
2021-09-23 7:51 ` [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
@ 2021-09-23 7:51 ` Akhil R
2021-09-23 22:35 ` Jon Hunter
2021-09-23 7:51 ` [PATCH v7 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
` (2 subsequent siblings)
3 siblings, 1 reply; 18+ messages in thread
From: Akhil R @ 2021-09-23 7:51 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Add DT binding document for Nvidia Tegra GPCDMA controller.
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
.../bindings/dma/nvidia,tegra186-gpc-dma.yaml | 98 ++++++++++++++++++++++
1 file changed, 98 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
new file mode 100644
index 0000000..3dcf5a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/nvidia,tegra186-gpc-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nvidia Tegra GPC DMA Controller Device Tree Bindings
+
+description: |
+ The Tegra Genernal Purpose Central (GPC) DMA controller is used for faster
+ data transfers between memory to memory, memory to device and device to
+ memory.
+
+maintainers:
+ - Jon Hunter <jonathanh@nvidia.com>
+ - Rajesh Gumasta <rgumasta@nvidia.com>
+
+allOf:
+ - $ref: "dma-controller.yaml#"
+
+properties:
+ "#dma-cells":
+ const: 1
+
+ compatible:
+ - enum:
+ - nvidia,tegra186-gpcdma
+ - nvidia,tegra194-gpcdma
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 1
+ maxItems: 32
+
+ resets:
+ maxItems: 1
+
+ reset-names:
+ const: gpcdma
+
+ iommus:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - resets
+ - reset-names
+ - "#dma-cells"
+ - iommus
+
+examples:
+ - |
+ gpcdma: dma@2600000 {
+ compatible = "nvidia,tegra186-gpcdma";
+ reg = <0x0 0x2600000 0x0 0x210000>;
+ resets = <&bpmp TEGRA186_RESET_GPCDMA>;
+ reset-names = "gpcdma";
+ interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ iommus = <&smmu TEGRA_SID_GPCDMA_0>;
+ dma-coherent;
+ };
+...
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v7 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-23 7:51 ` [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
2021-09-23 7:51 ` [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
@ 2021-09-23 7:51 ` Akhil R
2021-09-23 23:27 ` Jon Hunter
2021-09-23 7:51 ` [PATCH v7 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
2021-09-23 7:51 ` [PATCH v7 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
3 siblings, 1 reply; 18+ messages in thread
From: Akhil R @ 2021-09-23 7:51 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul, Pavan Kunapuli
Adding GPC DMA controller driver for Tegra186 and Tegra194. The driver
supports dma transfers between memory to memory, IO peripheral to memory
and memory to IO peripheral.
Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
drivers/dma/Kconfig | 12 +
drivers/dma/Makefile | 1 +
drivers/dma/tegra186-gpc-dma.c | 1354 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1367 insertions(+)
create mode 100644 drivers/dma/tegra186-gpc-dma.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 80c2c03..2eb9062 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -654,6 +654,18 @@ config TEGRA210_ADMA
peripheral and vice versa. It does not support memory to
memory data transfer.
+config TEGRA186_GPC_DMA
+ tristate "NVIDIA Tegra GPC DMA support"
+ depends on ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC || COMPILE_TEST
+ select DMA_ENGINE
+ help
+ Support for the NVIDIA Tegra186 and Tegra194 GPC DMA controller
+ driver. The DMA controller has multiple DMA channels which can
+ be configured for different peripherals like UART, SPI, etc
+ which are on APB bus.
+ This DMA controller transfers data from memory to peripheral FIFO
+ or vice versa. It also supports memory to memory data transfer.
+
config TIMB_DMA
tristate "Timberdale FPGA DMA support"
depends on MFD_TIMBERDALE || COMPILE_TEST
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 616d926..b701006 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -74,6 +74,7 @@ obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
obj-$(CONFIG_TEGRA210_ADMA) += tegra210-adma.o
+obj-$(CONFIG_TEGRA186_GPC_DMA) += tegra186-gpc-dma.o
obj-$(CONFIG_TIMB_DMA) += timb_dma.o
obj-$(CONFIG_UNIPHIER_MDMAC) += uniphier-mdmac.o
obj-$(CONFIG_UNIPHIER_XDMAC) += uniphier-xdmac.o
diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c
new file mode 100644
index 0000000..17181b9
--- /dev/null
+++ b/drivers/dma/tegra186-gpc-dma.c
@@ -0,0 +1,1353 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * DMA driver for Nvidia's Tegra186 and Tegra194 GPC DMA controller.
+ *
+ * Copyright (c) 2014-2021, NVIDIA CORPORATION. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/iommu.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <dt-bindings/memory/tegra186-mc.h>
+#include "virt-dma.h"
+
+/* CSR register */
+#define TEGRA_GPCDMA_CHAN_CSR 0x00
+#define TEGRA_GPCDMA_CSR_ENB BIT(31)
+#define TEGRA_GPCDMA_CSR_IE_EOC BIT(30)
+#define TEGRA_GPCDMA_CSR_ONCE BIT(27)
+
+#define TEGRA_GPCDMA_CSR_FC_MODE GENMASK(25, 24)
+#define TEGRA_GPCDMA_CSR_FC_MODE_NO_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 0)
+#define TEGRA_GPCDMA_CSR_FC_MODE_ONE_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 1)
+#define TEGRA_GPCDMA_CSR_FC_MODE_TWO_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 2)
+#define TEGRA_GPCDMA_CSR_FC_MODE_FOUR_MMIO \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 3)
+
+#define TEGRA_GPCDMA_CSR_DMA GENMASK(23, 21)
+#define TEGRA_GPCDMA_CSR_DMA_IO2MEM_NO_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 0)
+#define TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 1)
+#define TEGRA_GPCDMA_CSR_DMA_MEM2IO_NO_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 2)
+#define TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 3)
+#define TEGRA_GPCDMA_CSR_DMA_MEM2MEM \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 4)
+#define TEGRA_GPCDMA_CSR_DMA_FIXED_PAT \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 6)
+
+#define TEGRA_GPCDMA_CSR_REQ_SEL_MASK GENMASK(20, 16)
+#define TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED \
+ FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, 4)
+#define TEGRA_GPCDMA_CSR_IRQ_MASK BIT(15)
+#define TEGRA_GPCDMA_CSR_WEIGHT GENMASK(13, 10)
+
+/* STATUS register */
+#define TEGRA_GPCDMA_CHAN_STATUS 0x004
+#define TEGRA_GPCDMA_STATUS_BUSY BIT(31)
+#define TEGRA_GPCDMA_STATUS_ISE_EOC BIT(30)
+#define TEGRA_GPCDMA_STATUS_PING_PONG BIT(28)
+#define TEGRA_GPCDMA_STATUS_DMA_ACTIVITY BIT(27)
+#define TEGRA_GPCDMA_STATUS_CHANNEL_PAUSE BIT(26)
+#define TEGRA_GPCDMA_STATUS_CHANNEL_RX BIT(25)
+#define TEGRA_GPCDMA_STATUS_CHANNEL_TX BIT(24)
+#define TEGRA_GPCDMA_STATUS_IRQ_INTR_STA BIT(23)
+#define TEGRA_GPCDMA_STATUS_IRQ_STA BIT(21)
+#define TEGRA_GPCDMA_STATUS_IRQ_TRIG_STA BIT(20)
+
+#define TEGRA_GPCDMA_CHAN_CSRE 0x008
+#define TEGRA_GPCDMA_CHAN_CSRE_PAUSE BIT(31)
+
+/* Source address */
+#define TEGRA_GPCDMA_CHAN_SRC_PTR 0x00C
+
+/* Destination address */
+#define TEGRA_GPCDMA_CHAN_DST_PTR 0x010
+
+/* High address pointer */
+#define TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR 0x014
+#define TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR GENMASK(7, 0)
+#define TEGRA_GPCDMA_HIGH_ADDR_DST_PTR GENMASK(23, 16)
+
+/* MC sequence register */
+#define TEGRA_GPCDMA_CHAN_MCSEQ 0x18
+#define TEGRA_GPCDMA_MCSEQ_DATA_SWAP BIT(31)
+#define TEGRA_GPCDMA_MCSEQ_REQ_COUNT GENMASK(30, 25)
+#define TEGRA_GPCDMA_MCSEQ_BURST GENMASK(24, 23)
+#define TEGRA_GPCDMA_MCSEQ_BURST_2 \
+ FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 0)
+#define TEGRA_GPCDMA_MCSEQ_BURST_16 \
+ FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 3)
+#define TEGRA_GPCDMA_MCSEQ_WRAP1 GENMASK(22, 20)
+#define TEGRA_GPCDMA_MCSEQ_WRAP0 GENMASK(19, 17)
+#define TEGRA_GPCDMA_MCSEQ_WRAP_NONE 0
+
+#define TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK GENMASK(13, 7)
+#define TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK GENMASK(6, 0)
+
+/* MMIO sequence register */
+#define TEGRA_GPCDMA_CHAN_MMIOSEQ 0x01c
+#define TEGRA_GPCDMA_MMIOSEQ_DBL_BUF BIT(31)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH GENMASK(30, 28)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 0)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 1)
+#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 2)
+#define TEGRA_GPCDMA_MMIOSEQ_DATA_SWAP BIT(27)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST GENMASK(26, 23)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_1 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 0)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_2 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 1)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_4 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 3)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_8 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 7)
+#define TEGRA_GPCDMA_MMIOSEQ_BURST_16 \
+ FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BURST, 15)
+#define TEGRA_GPCDMA_MMIOSEQ_MASTER_ID GENMASK(22, 19)
+#define TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD GENMASK(18, 16)
+#define TEGRA_GPCDMA_MMIOSEQ_MMIO_PROT GENMASK(8, 7)
+
+/* Channel WCOUNT */
+#define TEGRA_GPCDMA_CHAN_WCOUNT 0x20
+
+/* Transfer count */
+#define TEGRA_GPCDMA_CHAN_XFER_COUNT 0x24
+
+/* DMA byte count status */
+#define TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS 0x28
+
+/* Error Status Register */
+#define TEGRA_GPCDMA_CHAN_ERR_STATUS 0x30
+#define TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT (8)
+#define TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK (0xF)
+#define TEGRA_GPCDMA_CHAN_ERR_TYPE(err) ( \
+ ((err) >> TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT) & \
+ TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK)
+#define TEGRA_DMA_BM_FIFO_FULL_ERR (0xF)
+#define TEGRA_DMA_PERIPH_FIFO_FULL_ERR (0xE)
+#define TEGRA_DMA_PERIPH_ID_ERR (0xD)
+#define TEGRA_DMA_STREAM_ID_ERR (0xC)
+#define TEGRA_DMA_MC_SLAVE_ERR (0xB)
+#define TEGRA_DMA_MMIO_SLAVE_ERR (0xA)
+
+/* Fixed Pattern */
+#define TEGRA_GPCDMA_CHAN_FIXED_PATTERN 0x34
+
+#define TEGRA_GPCDMA_CHAN_TZ 0x38
+#define TEGRA_GPCDMA_CHAN_TZ_MMIO_PROT_1 BIT(0)
+#define TEGRA_GPCDMA_CHAN_TZ_MC_PROT_1 BIT(1)
+
+#define TEGRA_GPCDMA_CHAN_SPARE 0x3c
+#define TEGRA_GPCDMA_CHAN_SPARE_EN_LEGACY_FC BIT(16)
+
+/*
+ * If any burst is in flight and DMA paused then this is the time to complete
+ * on-flight burst and update DMA status register.
+ */
+#define TEGRA_GPCDMA_BURST_COMPLETE_TIME 20
+#define TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT 100
+
+/* Channel base address offset from GPCDMA base address */
+#define TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET 0x10000
+
+struct tegra_dma;
+
+/*
+ * tegra_dma_chip_data Tegra chip specific DMA data
+ * @nr_channels: Number of channels available in the controller.
+ * @channel_reg_size: Channel register size.
+ * @max_dma_count: Maximum DMA transfer count supported by DMA controller.
+ * @hw_support_pause: DMA HW engine support pause of the channel.
+ */
+struct tegra_dma_chip_data {
+ unsigned int nr_channels;
+ unsigned int channel_reg_size;
+ unsigned int max_dma_count;
+ bool hw_support_pause;
+};
+
+/* DMA channel registers */
+struct tegra_dma_channel_regs {
+ unsigned long csr;
+ unsigned long src_ptr;
+ unsigned long dst_ptr;
+ unsigned long high_addr_ptr;
+ unsigned long mc_seq;
+ unsigned long mmio_seq;
+ unsigned long wcount;
+ unsigned long fixed_pattern;
+};
+
+/*
+ * tegra_dma_desc: Tegra DMA descriptors which uses virt_dma_desc to
+ * manage client request and keep track of transfer status, callbacks
+ * and request counts etc.
+ */
+struct tegra_dma_desc {
+ struct virt_dma_desc vd;
+ int bytes_requested;
+ int bytes_transferred;
+ struct tegra_dma_channel *tdc;
+ struct tegra_dma_channel_regs ch_regs;
+};
+
+struct tegra_dma_channel;
+
+/*
+ * tegra_dma_channel: Channel specific information
+ */
+struct tegra_dma_channel {
+ struct virt_dma_chan vc;
+ struct tegra_dma_desc *dma_desc;
+ char name[30];
+ bool config_init;
+ int id;
+ int irq;
+ unsigned int stream_id;
+ unsigned long chan_base_offset;
+ raw_spinlock_t lock;
+ bool busy;
+ struct tegra_dma *tdma;
+ int slave_id;
+ enum dma_transfer_direction sid_dir;
+ struct dma_slave_config dma_sconfig;
+};
+
+/*
+ * tegra_dma: Tegra DMA specific information
+ */
+struct tegra_dma {
+ struct dma_device dma_dev;
+ struct device *dev;
+ void __iomem *base_addr;
+ const struct tegra_dma_chip_data *chip_data;
+ struct reset_control *rst;
+ unsigned long sid_m2d_reserved;
+ unsigned long sid_d2m_reserved;
+ unsigned long sid_m2m_reserved;
+ struct tegra_dma_channel channels[0];
+};
+
+static inline void tdc_write(struct tegra_dma_channel *tdc,
+ u32 reg, u32 val)
+{
+ writel_relaxed(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+}
+
+static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
+{
+ return readl_relaxed(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+}
+
+static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
+{
+ return container_of(dc, struct tegra_dma_channel, vc.chan);
+}
+
+static inline struct tegra_dma_desc *vd_to_tegra_dma_desc(struct virt_dma_desc *vd)
+{
+ return container_of(vd, struct tegra_dma_desc, vd);
+}
+
+static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
+{
+ return tdc->vc.chan.device->dev;
+}
+
+static void tegra_dma_dump_chan_regs(struct tegra_dma_channel *tdc)
+{
+ dev_dbg(tdc2dev(tdc), "DMA Channel %d name %s register dump:\n",
+ tdc->id, tdc->name);
+ dev_dbg(tdc2dev(tdc), "CSR %x STA %x CSRE %x SRC %x DST %x\n",
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_DST_PTR)
+ );
+ dev_dbg(tdc2dev(tdc), "MCSEQ %x IOSEQ %x WCNT %x XFER %x BSTA %x\n",
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_WCOUNT),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT),
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS)
+ );
+ dev_dbg(tdc2dev(tdc), "DMA ERR_STA %x\n",
+ tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS));
+}
+
+static int tegra_dma_sid_reserve(struct tegra_dma_channel *tdc,
+ enum dma_transfer_direction direction)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+ unsigned int sid = tdc->slave_id;
+
+ if (!is_slave_direction(direction))
+ return 0;
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ if (test_and_set_bit(sid, &tdma->sid_m2d_reserved)) {
+ dev_err(tdma->dev, "slave id already in use\n");
+ return -EINVAL;
+ }
+ break;
+ case DMA_DEV_TO_MEM:
+ if (test_and_set_bit(sid, &tdma->sid_d2m_reserved)) {
+ dev_err(tdma->dev, "slave id already in use\n");
+ return -EINVAL;
+ }
+ break;
+ }
+
+ tdc->sid_dir = direction;
+
+ return 0;
+}
+
+static void tegra_dma_sid_free(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+ unsigned int sid = tdc->slave_id;
+
+ switch (tdc->sid_dir) {
+ case DMA_MEM_TO_DEV:
+ clear_bit(sid, &tdma->sid_m2d_reserved);
+ break;
+ case DMA_DEV_TO_MEM:
+ clear_bit(sid, &tdma->sid_d2m_reserved);
+ break;
+ }
+
+ tdc->sid_dir = DMA_TRANS_NONE;
+}
+
+static void tegra_dma_desc_free(struct virt_dma_desc *vd)
+{
+ kfree(container_of(vd, struct tegra_dma_desc, vd));
+}
+
+static int tegra_dma_slave_config(struct dma_chan *dc,
+ struct dma_slave_config *sconfig)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ if (tdc->dma_desc) {
+ dev_err(tdc2dev(tdc), "Configuration not allowed\n");
+ return -EBUSY;
+ }
+
+ memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
+ if (tdc->slave_id == -1)
+ tdc->slave_id = sconfig->slave_id;
+
+ tdc->config_init = true;
+ return 0;
+}
+
+static int tegra_dma_pause(struct tegra_dma_channel *tdc)
+{
+ u32 val;
+ int ret;
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, TEGRA_GPCDMA_CHAN_CSRE_PAUSE);
+
+ /* Wait until busy bit is de-asserted */
+ ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
+ tdc->chan_base_offset + TEGRA_GPCDMA_CHAN_STATUS,
+ val,
+ !(val & TEGRA_GPCDMA_STATUS_BUSY),
+ TEGRA_GPCDMA_BURST_COMPLETE_TIME,
+ TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
+
+ if (ret)
+ dev_err(tdc2dev(tdc), "DMA pause timed out\n");
+
+ return ret;
+}
+
+static void tegra_dma_stop(struct tegra_dma_channel *tdc)
+{
+ u32 csr, status;
+
+ csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
+
+ /* Disable interrupts */
+ csr &= ~TEGRA_GPCDMA_CSR_IE_EOC;
+
+ /* Disable DMA */
+ csr &= ~TEGRA_GPCDMA_CSR_ENB;
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
+
+ /* Clear interrupt status if it is there */
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
+ dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS, status);
+ }
+ tdc->busy = false;
+}
+
+static void tegra_dma_start(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_channel_regs *ch_regs;
+ struct virt_dma_desc *vdesc;
+
+ if (tdc->busy)
+ return;
+
+ vdesc = vchan_next_desc(&tdc->vc);
+ if (!vdesc)
+ return;
+
+ tdc->dma_desc = vd_to_tegra_dma_desc(vdesc);
+ if (!tdc->dma_desc)
+ return;
+
+ list_del(&vdesc->node);
+
+ tdc->dma_desc->tdc = tdc;
+ ch_regs = &tdc->dma_desc->ch_regs;
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_regs->wcount);
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, 0);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_regs->src_ptr);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_regs->dst_ptr);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR, ch_regs->high_addr_ptr);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_FIXED_PATTERN, ch_regs->fixed_pattern);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ, ch_regs->mmio_seq);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, ch_regs->mc_seq);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, 0);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, ch_regs->csr);
+
+ /* Start DMA */
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
+ ch_regs->csr | TEGRA_GPCDMA_CSR_ENB);
+
+ tdc->busy = true;
+}
+
+static void tegra_dma_xfer_complete(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma_desc *dma_desc;
+
+ tdc->busy = false;
+ dma_desc = tdc->dma_desc;
+ dma_desc->bytes_transferred += dma_desc->bytes_requested;
+
+ vchan_cookie_complete(&tdc->dma_desc->vd);
+}
+
+static void tegra_dma_chan_decode_error(struct tegra_dma_channel *tdc,
+ unsigned int err_status)
+{
+ switch (TEGRA_GPCDMA_CHAN_ERR_TYPE(err_status)) {
+ case TEGRA_DMA_BM_FIFO_FULL_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d bm fifo full\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_PERIPH_FIFO_FULL_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d peripheral fifo full\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_PERIPH_ID_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d illegal peripheral id\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_STREAM_ID_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d illegal stream id\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_MC_SLAVE_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d mc slave error\n", tdc->id);
+ break;
+
+ case TEGRA_DMA_MMIO_SLAVE_ERR:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d mmio slave error\n", tdc->id);
+ break;
+
+ default:
+ dev_err(tdc->tdma->dev,
+ "GPCDMA CH%d security violation %x\n", tdc->id,
+ err_status);
+ }
+}
+
+static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
+{
+ struct tegra_dma_channel *tdc = dev_id;
+ irqreturn_t ret = IRQ_NONE;
+ u32 status;
+
+ raw_spin_lock(&tdc->lock);
+
+ /* Check channel error status register */
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS);
+ if (status) {
+ tegra_dma_chan_decode_error(tdc, status);
+ tegra_dma_dump_chan_regs(tdc);
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS, 0xFFFFFFFF);
+ }
+
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS,
+ TEGRA_GPCDMA_STATUS_ISE_EOC);
+
+ tegra_dma_xfer_complete(tdc);
+ tegra_dma_start(tdc);
+
+ ret = IRQ_HANDLED;
+ }
+
+ raw_spin_unlock(&tdc->lock);
+ return ret;
+}
+
+static void tegra_dma_issue_pending(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+
+ if (!tdc->busy)
+ if (vchan_issue_pending(&tdc->vc))
+ tegra_dma_start(tdc);
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+}
+
+static void tegra_dma_reset_client(struct tegra_dma_channel *tdc)
+{
+ u32 csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
+
+ csr &= ~(TEGRA_GPCDMA_CSR_REQ_SEL_MASK);
+ csr |= TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED;
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
+}
+
+static int tegra_dma_stop_client(struct tegra_dma_channel *tdc)
+{
+ int ret;
+ unsigned long status;
+
+ /* Before Reading DMA status to figure out number
+ * of bytes transferred by DMA channel:
+ * Change the client associated with the DMA channel
+ * to stop DMA engine from starting any more bursts for
+ * the given client and wait for in flight bursts to complete
+ */
+ tegra_dma_reset_client(tdc);
+
+ /* Wait for in flight data transfer to finish */
+ udelay(TEGRA_GPCDMA_BURST_COMPLETE_TIME);
+
+ /* If TX/RX path is still active wait till it becomes
+ * inactive
+ */
+
+ ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
+ tdc->chan_base_offset +
+ TEGRA_GPCDMA_CHAN_STATUS,
+ status,
+ !(status & (TEGRA_GPCDMA_STATUS_CHANNEL_TX |
+ TEGRA_GPCDMA_STATUS_CHANNEL_RX)),
+ 5,
+ TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
+ if (ret) {
+ dev_err(tdc2dev(tdc), "Timeout waiting for DMA burst completion!\n");
+ tegra_dma_dump_chan_regs(tdc);
+ }
+
+ return ret;
+}
+
+static int tegra_dma_terminate_all(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long wcount = 0;
+ unsigned long status;
+ unsigned long flags;
+ int err;
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+
+ if (!tdc->dma_desc) {
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return 0;
+ }
+
+ if (!tdc->busy)
+ goto skip_dma_stop;
+
+ if (tdc->tdma->chip_data->hw_support_pause)
+ err = tegra_dma_pause(tdc);
+ else
+ err = tegra_dma_stop_client(tdc);
+
+ if (err) {
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return err;
+ }
+
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
+ dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
+ tegra_dma_xfer_complete(tdc);
+ status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
+ }
+
+ wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT);
+ tegra_dma_stop(tdc);
+
+ if (tdc->dma_desc)
+ tdc->dma_desc->bytes_transferred +=
+ tdc->dma_desc->bytes_requested - (wcount * 4);
+
+skip_dma_stop:
+ tegra_dma_sid_free(tdc);
+ kfree(tdc->dma_desc);
+ vchan_free_chan_resources(&tdc->vc);
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return 0;
+}
+
+static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ struct tegra_dma_desc *dma_desc = NULL;
+ struct virt_dma_desc *vd;
+ unsigned int residual;
+ enum dma_status ret;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+
+ ret = dma_cookie_status(dc, cookie, txstate);
+ if (ret == DMA_COMPLETE) {
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+ }
+
+ vd = vchan_find_desc(&tdc->vc, cookie);
+ if (vd)
+ dma_desc = vd_to_tegra_dma_desc(vd);
+ else if (tdc->dma_desc && tdc->dma_desc->vd.tx.cookie == cookie)
+ dma_desc = tdc->dma_desc;
+
+ if (dma_desc) {
+ residual = dma_desc->bytes_requested -
+ (dma_desc->bytes_transferred %
+ dma_desc->bytes_requested);
+ dma_set_residue(txstate, residual);
+ } else {
+ dev_err(tdc2dev(tdc), "cookie %d is not found\n", cookie);
+ }
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+ return ret;
+}
+
+static inline int get_bus_width(struct tegra_dma_channel *tdc,
+ enum dma_slave_buswidth slave_bw)
+{
+ switch (slave_bw) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32;
+ default:
+ dev_err(tdc2dev(tdc), "given slave bus width is not supported\n");
+ return -EINVAL;
+ }
+}
+
+static inline int get_burst_size_by_len(int len)
+{
+ int ret;
+
+ /* Get burst size based on the first set bit */
+ switch (ffs(len)) {
+ case 0:
+ case 1:
+ case 2:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
+ break;
+ case 3:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
+ break;
+ case 4:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
+ break;
+ case 5:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
+ break;
+ default:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
+ break;
+ }
+
+ return ret;
+}
+
+static inline int get_burst_size(struct tegra_dma_channel *tdc,
+ u32 burst_size,
+ enum dma_slave_buswidth slave_bw,
+ int len)
+{
+ int burst_mmio_width, burst_byte, ret;
+
+ /*
+ * burst_size from client is in terms of the bus_width.
+ * convert that into words.
+ */
+ burst_byte = burst_size * slave_bw;
+ burst_mmio_width = ffs(burst_byte / 4);
+
+ /* Get burst size based on the first set bit */
+ switch (burst_mmio_width) {
+ case 0:
+ ret = get_burst_size_by_len(len);
+ break;
+ case 1:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
+ break;
+ case 2:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
+ break;
+ case 3:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
+ break;
+ case 4:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
+ break;
+ default:
+ ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
+ break;
+ }
+
+ return ret;
+}
+
+static int get_transfer_param(struct tegra_dma_channel *tdc,
+ enum dma_transfer_direction direction,
+ unsigned long *apb_addr,
+ unsigned long *mmio_seq,
+ unsigned long *csr,
+ unsigned int *burst_size,
+ enum dma_slave_buswidth *slave_bw)
+{
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ *apb_addr = tdc->dma_sconfig.dst_addr;
+ *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
+ *burst_size = tdc->dma_sconfig.dst_maxburst;
+ *slave_bw = tdc->dma_sconfig.dst_addr_width;
+ *csr = TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC;
+ return 0;
+ case DMA_DEV_TO_MEM:
+ *apb_addr = tdc->dma_sconfig.src_addr;
+ *mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
+ *burst_size = tdc->dma_sconfig.src_maxburst;
+ *slave_bw = tdc->dma_sconfig.src_addr_width;
+ *csr = TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC;
+ return 0;
+ case DMA_MEM_TO_MEM:
+ *burst_size = tdc->dma_sconfig.src_addr_width;
+ *csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
+ return 0;
+ default:
+ dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
+ }
+
+ return -EINVAL;
+}
+
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_dma_memset(struct dma_chan *dc, dma_addr_t dest, int value,
+ size_t len, unsigned long flags)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned int max_dma_count = tdc->tdma->chip_data->max_dma_count;
+ struct tegra_dma_desc *dma_desc;
+ unsigned long csr, mc_seq;
+
+ if ((len & 3) || (dest & 3) || len > max_dma_count) {
+ dev_err(tdc2dev(tdc),
+ "DMA length/memory address is not supported\n");
+ return NULL;
+ }
+
+ /* Set dma mode to fixed pattern */
+ csr = TEGRA_GPCDMA_CSR_DMA_FIXED_PAT;
+ /* Enable once or continuous mode */
+ csr |= TEGRA_GPCDMA_CSR_ONCE;
+ /* Enable IRQ mask */
+ csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
+ /* Enable the dma interrupt */
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_GPCDMA_CSR_IE_EOC;
+ /* Configure default priority weight for the channel */
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
+
+ mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+ /* retain stream-id and clean rest */
+ mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
+
+ /* Set the address wrapping */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+
+ /* Program outstanding MC requests */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
+ /* Set burst size */
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
+
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+ if (!dma_desc)
+ return NULL;
+
+ dma_desc->bytes_requested = 0;
+ dma_desc->bytes_transferred = 0;
+
+ dma_desc->bytes_requested += len;
+ dma_desc->ch_regs.src_ptr = 0;
+ dma_desc->ch_regs.dst_ptr = dest;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
+ dma_desc->ch_regs.fixed_pattern = value;
+ /* Word count reg takes value as (N +1) words */
+ dma_desc->ch_regs.wcount = ((len - 4) >> 2);
+ dma_desc->ch_regs.csr = csr;
+ dma_desc->ch_regs.mmio_seq = 0;
+ dma_desc->ch_regs.mc_seq = mc_seq;
+
+ tdc->dma_desc = dma_desc;
+
+ return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
+}
+
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_dma_memcpy(struct dma_chan *dc, dma_addr_t dest,
+ dma_addr_t src, size_t len, unsigned long flags)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned int max_dma_count = tdc->tdma->chip_data->max_dma_count;
+ struct tegra_dma_desc *dma_desc;
+ unsigned long csr, mc_seq;
+
+ if ((len & 3) || (src & 3) || (dest & 3) || len > max_dma_count) {
+ dev_err(tdc2dev(tdc),
+ "DMA length/memory address is not supported\n");
+ return NULL;
+ }
+
+ /* Set dma mode to memory to memory transfer */
+ csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
+ /* Enable once or continuous mode */
+ csr |= TEGRA_GPCDMA_CSR_ONCE;
+ /* Enable IRQ mask */
+ csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
+ /* Enable the dma interrupt */
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_GPCDMA_CSR_IE_EOC;
+ /* Configure default priority weight for the channel */
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
+
+ mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+ /* retain stream-id and clean rest */
+ mc_seq &= (TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK) |
+ (TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
+
+ /* Set the address wrapping */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+
+ /* Program outstanding MC requests */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
+ /* Set burst size */
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
+
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+ if (!dma_desc)
+ return NULL;
+
+ dma_desc->bytes_requested = 0;
+ dma_desc->bytes_transferred = 0;
+
+ dma_desc->bytes_requested += len;
+ dma_desc->ch_regs.src_ptr = src;
+ dma_desc->ch_regs.dst_ptr = dest;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (src >> 32));
+ dma_desc->ch_regs.high_addr_ptr |=
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
+ /* Word count reg takes value as (N +1) words */
+ dma_desc->ch_regs.wcount = ((len - 4) >> 2);
+ dma_desc->ch_regs.csr = csr;
+ dma_desc->ch_regs.mmio_seq = 0;
+ dma_desc->ch_regs.mc_seq = mc_seq;
+
+ return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
+}
+
+static struct dma_async_tx_descriptor *
+tegra_dma_prep_slave_sg(struct dma_chan *dc, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long csr, mc_seq, apb_ptr = 0, mmio_seq = 0;
+ enum dma_slave_buswidth slave_bw;
+ struct tegra_dma_desc *dma_desc;
+ struct scatterlist *sg;
+ u32 burst_size;
+ unsigned int i;
+ int ret;
+
+ if (!tdc->config_init) {
+ dev_err(tdc2dev(tdc), "DMA channel is not configured\n");
+ return NULL;
+ }
+ if (sg_len < 1) {
+ dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
+ return NULL;
+ }
+
+ ret = tegra_dma_sid_reserve(tdc, direction);
+ if (ret)
+ return NULL;
+
+ ret = get_transfer_param(tdc, direction, &apb_ptr, &mmio_seq, &csr,
+ &burst_size, &slave_bw);
+ if (ret < 0)
+ return NULL;
+
+ /* Enable once or continuous mode */
+ csr |= TEGRA_GPCDMA_CSR_ONCE;
+ /* Program the slave id in requestor select */
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, tdc->slave_id);
+ /* Enable IRQ mask */
+ csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
+ /* Configure default priority weight for the channel*/
+ csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
+
+ /* Enable the dma interrupt */
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_GPCDMA_CSR_IE_EOC;
+
+ mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+ /* retain stream-id and clean rest */
+ mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
+
+ /* Set the address wrapping on both MC and MMIO side */
+
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
+ TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
+ mmio_seq |= FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD, 1);
+
+ /* Program 2 MC outstanding requests by default. */
+ mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
+
+ /* Setting MC burst size depending on MMIO burst size */
+ if (burst_size == 64)
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
+ else
+ mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_2;
+
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+ if (!dma_desc)
+ return NULL;
+
+ dma_desc->bytes_requested = 0;
+ dma_desc->bytes_transferred = 0;
+
+ /* Make transfer requests */
+ for_each_sg(sgl, sg, sg_len, i) {
+ u32 len;
+ dma_addr_t mem;
+
+ mem = sg_dma_address(sg);
+ len = sg_dma_len(sg);
+
+ if ((len & 3) || (mem & 3) ||
+ len > tdc->tdma->chip_data->max_dma_count) {
+ dev_err(tdc2dev(tdc),
+ "DMA length/memory address is not supported\n");
+ kfree(dma_desc);
+ return NULL;
+ }
+
+ mmio_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
+ dma_desc->bytes_requested += len;
+
+ if (direction == DMA_MEM_TO_DEV) {
+ dma_desc->ch_regs.src_ptr = mem;
+ dma_desc->ch_regs.dst_ptr = apb_ptr;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (mem >> 32));
+ } else if (direction == DMA_DEV_TO_MEM) {
+ dma_desc->ch_regs.src_ptr = apb_ptr;
+ dma_desc->ch_regs.dst_ptr = mem;
+ dma_desc->ch_regs.high_addr_ptr =
+ FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (mem >> 32));
+ }
+
+ /*
+ * Word count register takes input in words. Writing a value
+ * of N into word count register means a req of (N+1) words.
+ */
+ dma_desc->ch_regs.wcount = ((len - 4) >> 2);
+ dma_desc->ch_regs.csr = csr;
+ dma_desc->ch_regs.mmio_seq = mmio_seq;
+ dma_desc->ch_regs.mc_seq = mc_seq;
+ tdc->dma_desc = dma_desc;
+ }
+
+ return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
+}
+
+static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ dma_cookie_init(&tdc->vc.chan);
+ tdc->config_init = false;
+ return 0;
+}
+
+static void tegra_dma_chan_synchronize(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ vchan_synchronize(&tdc->vc);
+}
+
+static void tegra_dma_free_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+ unsigned long flags;
+
+ dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
+
+ tegra_dma_terminate_all(dc);
+
+ tegra_dma_chan_synchronize(dc);
+
+ tasklet_kill(&tdc->vc.task);
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+ tdc->config_init = false;
+ tdc->slave_id = -1;
+ tdc->sid_dir = DMA_TRANS_NONE;
+
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+}
+
+static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct tegra_dma *tdma = ofdma->of_dma_data;
+ struct tegra_dma_channel *tdc;
+ struct dma_chan *chan;
+
+ chan = dma_get_any_slave_channel(&tdma->dma_dev);
+ if (!chan)
+ return NULL;
+
+ tdc = to_tegra_dma_chan(chan);
+ tdc->slave_id = dma_spec->args[0];
+
+ return chan;
+}
+
+static const struct tegra_dma_chip_data tegra186_dma_chip_data = {
+ .nr_channels = 32,
+ .channel_reg_size = SZ_64K,
+ .max_dma_count = SZ_1G,
+ .hw_support_pause = false,
+};
+
+static const struct tegra_dma_chip_data tegra194_dma_chip_data = {
+ .nr_channels = 32,
+ .channel_reg_size = SZ_64K,
+ .max_dma_count = SZ_1G,
+ .hw_support_pause = true,
+};
+
+static const struct of_device_id tegra_dma_of_match[] = {
+ {
+ .compatible = "nvidia,tegra186-gpcdma",
+ .data = &tegra186_dma_chip_data,
+ }, {
+ .compatible = "nvidia,tegra194-gpcdma",
+ .data = &tegra194_dma_chip_data,
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
+
+static int tegra_dma_program_sid(struct tegra_dma_channel *tdc,
+ int chan, int stream_id)
+{
+ unsigned int reg_val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
+
+ reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK);
+ reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
+
+ reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK, stream_id);
+ reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK, stream_id);
+
+ tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, reg_val);
+ return 0;
+}
+
+static int tegra_dma_probe(struct platform_device *pdev)
+{
+ const struct tegra_dma_chip_data *cdata = NULL;
+ struct iommu_fwspec *iommu_spec;
+ unsigned int stream_id, i;
+ struct tegra_dma *tdma;
+ struct resource *res;
+ int ret;
+
+ cdata = of_device_get_match_data(&pdev->dev);
+
+ tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
+ sizeof(struct tegra_dma_channel), GFP_KERNEL);
+ if (!tdma)
+ return -ENOMEM;
+
+ tdma->dev = &pdev->dev;
+ tdma->chip_data = cdata;
+ platform_set_drvdata(pdev, tdma);
+
+ tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(tdma->base_addr))
+ return PTR_ERR(tdma->base_addr);
+
+ tdma->rst = devm_reset_control_get_exclusive(&pdev->dev, "gpcdma");
+ if (IS_ERR(tdma->rst)) {
+ dev_err_probe(&pdev->dev, PTR_ERR(tdma->rst),
+ "Missing controller reset\n");
+ return PTR_ERR(tdma->rst);
+ }
+ reset_control_reset(tdma->rst);
+
+ tdma->dma_dev.dev = &pdev->dev;
+
+ iommu_spec = dev_iommu_fwspec_get(&pdev->dev);
+ if (!iommu_spec) {
+ dev_err(&pdev->dev, "Missing iommu stream-id\n");
+ return -EINVAL;
+ }
+ stream_id = iommu_spec->ids[0] & 0xffff;
+
+ INIT_LIST_HEAD(&tdma->dma_dev.channels);
+ for (i = 0; i < cdata->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ tdc->chan_base_offset = TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET +
+ i * cdata->channel_reg_size;
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+ if (!res) {
+ dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
+ return -EINVAL;
+ }
+ tdc->irq = res->start;
+ snprintf(tdc->name, sizeof(tdc->name), "gpcdma.%d", i);
+
+ tdc->tdma = tdma;
+ tdc->id = i;
+ tdc->slave_id = -1;
+
+ vchan_init(&tdc->vc, &tdma->dma_dev);
+ tdc->vc.desc_free = tegra_dma_desc_free;
+ raw_spin_lock_init(&tdc->lock);
+
+ /* program stream-id for this channel */
+ tegra_dma_program_sid(tdc, i, stream_id);
+ tdc->stream_id = stream_id;
+ }
+
+ dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_MEMCPY, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_MEMSET, tdma->dma_dev.cap_mask);
+
+ /*
+ * Only word aligned transfers are supported. Set the copy
+ * alignment shift.
+ */
+ tdma->dma_dev.copy_align = 2;
+ tdma->dma_dev.fill_align = 2;
+ tdma->dma_dev.device_alloc_chan_resources =
+ tegra_dma_alloc_chan_resources;
+ tdma->dma_dev.device_free_chan_resources =
+ tegra_dma_free_chan_resources;
+ tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
+ tdma->dma_dev.device_prep_dma_memcpy = tegra_dma_prep_dma_memcpy;
+ tdma->dma_dev.device_prep_dma_memset = tegra_dma_prep_dma_memset;
+ tdma->dma_dev.device_config = tegra_dma_slave_config;
+ tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all;
+ tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
+ tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
+ tdma->dma_dev.device_synchronize = tegra_dma_chan_synchronize;
+ tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+
+ /* Register DMA channel interrupt handlers after everything is setup */
+ for (i = 0; i < cdata->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ ret = devm_request_irq(&pdev->dev, tdc->irq,
+ tegra_dma_isr, 0, tdc->name, tdc);
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret,
+ "request_irq failed for channel %d\n", i);
+ return ret;
+ }
+ }
+
+ ret = dma_async_device_register(&tdma->dma_dev);
+ if (ret < 0) {
+ dev_err_probe(&pdev->dev, ret,
+ "GPC DMA driver registration failed\n");
+ return ret;
+ }
+
+ ret = of_dma_controller_register(pdev->dev.of_node,
+ tegra_dma_of_xlate, tdma);
+ if (ret < 0) {
+ dev_err_probe(&pdev->dev, ret,
+ "GPC DMA OF registration failed\n");
+
+ dma_async_device_unregister(&tdma->dma_dev);
+ return ret;
+ }
+
+ dev_info(&pdev->dev, "GPC DMA driver register %d channels\n",
+ cdata->nr_channels);
+
+ return 0;
+}
+
+static int tegra_dma_remove(struct platform_device *pdev)
+{
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+
+ of_dma_controller_free(pdev->dev.of_node);
+ dma_async_device_unregister(&tdma->dma_dev);
+
+ return 0;
+}
+
+/*
+ * Save and restore csr and channel register on pm_suspend
+ * and pm_resume respectively
+ */
+static int __maybe_unused tegra_dma_pm_suspend(struct device *dev)
+{
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
+ unsigned long flags;
+ unsigned int i;
+ bool busy;
+
+ for (i = 0; i < tdma->chip_data->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ raw_spin_lock_irqsave(&tdc->lock, flags);
+ busy = tdc->busy;
+ raw_spin_unlock_irqrestore(&tdc->lock, flags);
+
+ if (busy) {
+ dev_err(tdma->dev, "channel %u busy\n", i);
+ return -EBUSY;
+ }
+ }
+
+ return 0;
+}
+
+static int __maybe_unused tegra_dma_pm_resume(struct device *dev)
+{
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
+ unsigned int i;
+
+ reset_control_reset(tdma->rst);
+
+ for (i = 0; i < tdma->chip_data->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ tegra_dma_program_sid(tdc, i, tdc->stream_id);
+ }
+
+ return 0;
+}
+
+static const struct __maybe_unused dev_pm_ops tegra_dma_dev_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
+};
+
+static struct platform_driver tegra_dmac_driver = {
+ .driver = {
+ .name = "tegra-gpcdma",
+ .owner = THIS_MODULE,
+ .pm = &tegra_dma_dev_pm_ops,
+ .of_match_table = tegra_dma_of_match,
+ },
+ .probe = tegra_dma_probe,
+ .remove = tegra_dma_remove,
+};
+
+module_platform_driver(tegra_dmac_driver);
+
+MODULE_ALIAS("platform:tegra-gpc-dma");
+MODULE_DESCRIPTION("NVIDIA Tegra GPC DMA Controller driver");
+MODULE_AUTHOR("Pavan Kunapuli <pkunapuli@nvidia.com>");
+MODULE_AUTHOR("Rajesh Gumasta <rgumasta@nvidia.com>");
+MODULE_LICENSE("GPL v2");
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v7 3/4] arm64: defconfig: tegra: Enable GPCDMA
2021-09-23 7:51 ` [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
2021-09-23 7:51 ` [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
2021-09-23 7:51 ` [PATCH v7 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
@ 2021-09-23 7:51 ` Akhil R
2021-09-23 7:51 ` [PATCH v7 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
3 siblings, 0 replies; 18+ messages in thread
From: Akhil R @ 2021-09-23 7:51 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Enable TEGRA_GPC_DMA in defconfig for Tegra186 and Tegra196 gpc
dma controller driver
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
arch/arm64/configs/defconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 156d96a..06a6737 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -930,6 +930,7 @@ CONFIG_OWL_DMA=y
CONFIG_PL330_DMA=y
CONFIG_TEGRA20_APB_DMA=y
CONFIG_TEGRA210_ADMA=m
+CONFIG_TEGRA186_GPC_DMA=m
CONFIG_QCOM_BAM_DMA=y
CONFIG_QCOM_HIDMA_MGMT=y
CONFIG_QCOM_HIDMA=y
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v7 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194
2021-09-23 7:51 ` [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
` (2 preceding siblings ...)
2021-09-23 7:51 ` [PATCH v7 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
@ 2021-09-23 7:51 ` Akhil R
2021-09-23 23:20 ` Jon Hunter
3 siblings, 1 reply; 18+ messages in thread
From: Akhil R @ 2021-09-23 7:51 UTC (permalink / raw)
To: akhilrajeev
Cc: dan.j.williams, dmaengine, jonathanh, kyarlagadda, ldewangan,
linux-kernel, linux-tegra, p.zabel, rgumasta, thierry.reding,
vkoul
Add device tree node for GPCDMA controller on Tegra186 target
and Tegra194 target.
Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi | 4 +++
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 44 ++++++++++++++++++++++++++
arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi | 4 +++
arch/arm64/boot/dts/nvidia/tegra194.dtsi | 44 ++++++++++++++++++++++++++
4 files changed, 96 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
index fcd71bf..71dd10e 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
@@ -56,6 +56,10 @@
};
};
+ dma@2600000 {
+ status = "okay";
+ };
+
memory-controller@2c00000 {
status = "okay";
};
diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
index e94f8ad..6f62d78 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
@@ -73,6 +73,50 @@
snps,rxpbl = <8>;
};
+ gpcdma: dma@2600000 {
+ compatible = "nvidia,tegra186-gpcdma";
+ reg = <0x2600000 0x210000>;
+ resets = <&bpmp TEGRA186_RESET_GPCDMA>;
+ reset-names = "gpcdma";
+ interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
+ dma-coherent;
+ status = "disabled";
+ };
+
aconnect@2900000 {
compatible = "nvidia,tegra186-aconnect",
"nvidia,tegra210-aconnect";
diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
index c4058ee..9988717 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
@@ -49,6 +49,10 @@
};
};
+ dma@2600000 {
+ status = "okay";
+ };
+
memory-controller@2c00000 {
status = "okay";
};
diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
index c8250a3..27571da 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
@@ -72,6 +72,50 @@
snps,rxpbl = <8>;
};
+ gpcdma: dma@2600000 {
+ compatible = "nvidia,tegra194-gpcdma";
+ reg = <0x2600000 0x210000>;
+ resets = <&bpmp TEGRA194_RESET_GPCDMA>;
+ reset-names = "gpcdma";
+ interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+ #dma-cells = <1>;
+ iommus = <&smmu TEGRA194_SID_GPCDMA_0>;
+ dma-coherent;
+ status = "disabled";
+ };
+
aconnect@2900000 {
compatible = "nvidia,tegra194-aconnect",
"nvidia,tegra210-aconnect";
--
2.7.4
^ permalink raw reply related [flat|nested] 18+ messages in thread
* Re: [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-22 14:46 ` Akhil R
@ 2021-09-23 12:22 ` Jon Hunter
2021-09-23 12:51 ` Akhil R
0 siblings, 1 reply; 18+ messages in thread
From: Jon Hunter @ 2021-09-23 12:22 UTC (permalink / raw)
To: Akhil R
Cc: dan.j.williams, dmaengine, Krishna Yarlagadda, Laxman Dewangan,
linux-kernel, linux-tegra, p.zabel, Rajesh Gumasta,
thierry.reding, vkoul, Pavan Kunapuli
On 22/09/2021 15:46, Akhil R wrote:
>
>> On 17/09/2021 15:11, Akhil R wrote:
>>> +static int tegra_dma_slave_config(struct dma_chan *dc,
>>> + struct dma_slave_config *sconfig) {
>>> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
>>> +
>>> + if (tdc->dma_desc) {
>>> + dev_err(tdc2dev(tdc), "Configuration not allowed\n");
>>> + return -EBUSY;
>>> + }
>>> +
>>> + memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
>>> + if (tdc->slave_id == -1)
>>> + tdc->slave_id = sconfig->slave_id;
>>> +
>>> + tdc->config_init = true;
>>> + return 0;
>>> +}
>>
>> So you have a function to reserve a slave ID, but you don't check here if it is
>> already reserved.
> slave-id is reserved considering the direction as well.
> 'direction' is available only during prep_slave_sg function, I guess.
Sorry I don't understand what you mean by that.
Jon
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
* RE: [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-23 12:22 ` Jon Hunter
@ 2021-09-23 12:51 ` Akhil R
2021-09-23 13:20 ` Jon Hunter
0 siblings, 1 reply; 18+ messages in thread
From: Akhil R @ 2021-09-23 12:51 UTC (permalink / raw)
To: Jonathan Hunter
Cc: dan.j.williams, dmaengine, Krishna Yarlagadda, Laxman Dewangan,
linux-kernel, linux-tegra, p.zabel, Rajesh Gumasta,
thierry.reding, vkoul, Pavan Kunapuli
> On 22/09/2021 15:46, Akhil R wrote:
> >
> >> On 17/09/2021 15:11, Akhil R wrote:
> >>> +static int tegra_dma_slave_config(struct dma_chan *dc,
> >>> + struct dma_slave_config *sconfig) {
> >>> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> >>> +
> >>> + if (tdc->dma_desc) {
> >>> + dev_err(tdc2dev(tdc), "Configuration not allowed\n");
> >>> + return -EBUSY;
> >>> + }
> >>> +
> >>> + memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
> >>> + if (tdc->slave_id == -1)
> >>> + tdc->slave_id = sconfig->slave_id;
> >>> +
> >>> + tdc->config_init = true;
> >>> + return 0;
> >>> +}
> >>
> >> So you have a function to reserve a slave ID, but you don't check
> >> here if it is already reserved.
> > slave-id is reserved considering the direction as well.
> > 'direction' is available only during prep_slave_sg function, I guess.
>
> Sorry I don't understand what you mean by that.
I mean, it would not be possible to check if the sid is in use without knowing
if the direction is MEM_TO_DEV or DEV_TO_MEM. The bitmask to check the
sid reservation is separate for MEM_TO_DEV and DEV_TO_MEM.
To get the direction parameter, we would need to wait till dma_prep_slave_sg
is called, I guess. I saw in the documentation that the 'direction' element in
dma_slave_config struct is deprecated and should use the value passed to
dma_prep_slave_sg().
Regards,
Akhil
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-23 12:51 ` Akhil R
@ 2021-09-23 13:20 ` Jon Hunter
0 siblings, 0 replies; 18+ messages in thread
From: Jon Hunter @ 2021-09-23 13:20 UTC (permalink / raw)
To: Akhil R
Cc: dan.j.williams, dmaengine, Krishna Yarlagadda, Laxman Dewangan,
linux-kernel, linux-tegra, p.zabel, Rajesh Gumasta,
thierry.reding, vkoul, Pavan Kunapuli
On 23/09/2021 13:51, Akhil R wrote:
>> On 22/09/2021 15:46, Akhil R wrote:
>>>
>>>> On 17/09/2021 15:11, Akhil R wrote:
>>>>> +static int tegra_dma_slave_config(struct dma_chan *dc,
>>>>> + struct dma_slave_config *sconfig) {
>>>>> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
>>>>> +
>>>>> + if (tdc->dma_desc) {
>>>>> + dev_err(tdc2dev(tdc), "Configuration not allowed\n");
>>>>> + return -EBUSY;
>>>>> + }
>>>>> +
>>>>> + memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
>>>>> + if (tdc->slave_id == -1)
>>>>> + tdc->slave_id = sconfig->slave_id;
>>>>> +
>>>>> + tdc->config_init = true;
>>>>> + return 0;
>>>>> +}
>>>>
>>>> So you have a function to reserve a slave ID, but you don't check
>>>> here if it is already reserved.
>>> slave-id is reserved considering the direction as well.
>>> 'direction' is available only during prep_slave_sg function, I guess.
>>
>> Sorry I don't understand what you mean by that.
> I mean, it would not be possible to check if the sid is in use without knowing
> if the direction is MEM_TO_DEV or DEV_TO_MEM. The bitmask to check the
> sid reservation is separate for MEM_TO_DEV and DEV_TO_MEM.
> To get the direction parameter, we would need to wait till dma_prep_slave_sg
> is called, I guess. I saw in the documentation that the 'direction' element in
> dma_slave_config struct is deprecated and should use the value passed to
> dma_prep_slave_sg().
Do we even need to worry about slave_id here? Typically the slave_id is
coming from device-tree and so is handled by tegra_dma_of_xlate(). I
would drop this unless there is an actual use-case we need to support
that uses this.
Jon
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma
2021-09-23 7:51 ` [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
@ 2021-09-23 22:35 ` Jon Hunter
0 siblings, 0 replies; 18+ messages in thread
From: Jon Hunter @ 2021-09-23 22:35 UTC (permalink / raw)
To: Akhil R
Cc: dan.j.williams, dmaengine, kyarlagadda, ldewangan, linux-kernel,
linux-tegra, p.zabel, rgumasta, thierry.reding, vkoul
On 23/09/2021 08:51, Akhil R wrote:
> Add DT binding document for Nvidia Tegra GPCDMA controller.
>
> Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
> Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
> ---
> .../bindings/dma/nvidia,tegra186-gpc-dma.yaml | 98 ++++++++++++++++++++++
> 1 file changed, 98 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
>
> diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> new file mode 100644
> index 0000000..3dcf5a1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> @@ -0,0 +1,98 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/nvidia,tegra186-gpc-dma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nvidia Tegra GPC DMA Controller Device Tree Bindings
If you ...
grep -r "title: NVIDIA" Documentation/devicetree/
You will find the titles all start "title: NVIDIA" and not Nvidia.
Always good to be consistent.
> +
> +description: |
> + The Tegra Genernal Purpose Central (GPC) DMA controller is used for faster
s/Genernal/General
> + data transfers between memory to memory, memory to device and device to
> + memory.
> +
> +maintainers:
> + - Jon Hunter <jonathanh@nvidia.com>
> + - Rajesh Gumasta <rgumasta@nvidia.com>
> +
> +allOf:
> + - $ref: "dma-controller.yaml#"
> +
> +properties:
> + "#dma-cells":
> + const: 1
> +
> + compatible:
> + - enum:
> + - nvidia,tegra186-gpcdma
> + - nvidia,tegra194-gpcdma
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + minItems: 1
> + maxItems: 32
> +
> + resets:
> + maxItems: 1
> +
> + reset-names:
> + const: gpcdma
> +
> + iommus:
> + maxItems: 1
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - resets
> + - reset-names
> + - "#dma-cells"
> + - iommus
> +
> +examples:
> + - |
> + gpcdma: dma@2600000 {
The upstream convention is ...
gpcdma: dma-controller@2600000 {
> + compatible = "nvidia,tegra186-gpcdma";
> + reg = <0x0 0x2600000 0x0 0x210000>;
> + resets = <&bpmp TEGRA186_RESET_GPCDMA>;
> + reset-names = "gpcdma";
> + interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
> + #dma-cells = <1>;
> + iommus = <&smmu TEGRA_SID_GPCDMA_0>;
> + dma-coherent;
> + };
> +...
>
Please run ...
$ make dt_binding_check
CHKDT Documentation/devicetree/bindings/processed-schema-examples.json
./Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml:
while scanning for the next token
found character that cannot start any token
in "<unicode string>", line 34, column 1
For more details see ...
https://www.kernel.org/doc/Documentation/devicetree/writing-schema.rst
Jon
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v7 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194
2021-09-23 7:51 ` [PATCH v7 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
@ 2021-09-23 23:20 ` Jon Hunter
0 siblings, 0 replies; 18+ messages in thread
From: Jon Hunter @ 2021-09-23 23:20 UTC (permalink / raw)
To: Akhil R
Cc: dan.j.williams, dmaengine, kyarlagadda, ldewangan, linux-kernel,
linux-tegra, p.zabel, rgumasta, thierry.reding, vkoul
On 23/09/2021 08:51, Akhil R wrote:
> Add device tree node for GPCDMA controller on Tegra186 target
> and Tegra194 target.
>
> Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
> Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
> ---
> arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi | 4 +++
> arch/arm64/boot/dts/nvidia/tegra186.dtsi | 44 ++++++++++++++++++++++++++
> arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi | 4 +++
> arch/arm64/boot/dts/nvidia/tegra194.dtsi | 44 ++++++++++++++++++++++++++
> 4 files changed, 96 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
> index fcd71bf..71dd10e 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
> @@ -56,6 +56,10 @@
> };
> };
>
> + dma@2600000 {
> + status = "okay";
> + };
> +
> memory-controller@2c00000 {
> status = "okay";
> };
> diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> index e94f8ad..6f62d78 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> @@ -73,6 +73,50 @@
> snps,rxpbl = <8>;
> };
>
> + gpcdma: dma@2600000 {
gpcdma: dma-controller@2600000
> + compatible = "nvidia,tegra186-gpcdma";
Please fix the indent here.
> + reg = <0x2600000 0x210000>;
> + resets = <&bpmp TEGRA186_RESET_GPCDMA>;
> + reset-names = "gpcdma";
> + interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
> + #dma-cells = <1>;
> + iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
> + dma-coherent;
> + status = "disabled";
> + };
> +
> aconnect@2900000 {
> compatible = "nvidia,tegra186-aconnect",
> "nvidia,tegra210-aconnect";
> diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
> index c4058ee..9988717 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
> @@ -49,6 +49,10 @@
> };
> };
>
> + dma@2600000 {
> + status = "okay";
> + };
> +
> memory-controller@2c00000 {
> status = "okay";
> };
> diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> index c8250a3..27571da 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> @@ -72,6 +72,50 @@
> snps,rxpbl = <8>;
> };
>
> + gpcdma: dma@2600000 {
gpcdma: dma-controller@2600000
> + compatible = "nvidia,tegra194-gpcdma";
> + reg = <0x2600000 0x210000>;
> + resets = <&bpmp TEGRA194_RESET_GPCDMA>;
> + reset-names = "gpcdma";
> + interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
> + #dma-cells = <1>;
> + iommus = <&smmu TEGRA194_SID_GPCDMA_0>;
> + dma-coherent;
> + status = "disabled";
> + };
> +
> aconnect@2900000 {
> compatible = "nvidia,tegra194-aconnect",
> "nvidia,tegra210-aconnect";
>
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v7 2/4] dmaengine: tegra: Add tegra gpcdma driver
2021-09-23 7:51 ` [PATCH v7 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
@ 2021-09-23 23:27 ` Jon Hunter
0 siblings, 0 replies; 18+ messages in thread
From: Jon Hunter @ 2021-09-23 23:27 UTC (permalink / raw)
To: Akhil R
Cc: dan.j.williams, dmaengine, kyarlagadda, ldewangan, linux-kernel,
linux-tegra, p.zabel, rgumasta, thierry.reding, vkoul,
Pavan Kunapuli
On 23/09/2021 08:51, Akhil R wrote:
> Adding GPC DMA controller driver for Tegra186 and Tegra194. The driver
> supports dma transfers between memory to memory, IO peripheral to memory
> and memory to IO peripheral.
>
> Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
> Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
> Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
> ---
> drivers/dma/Kconfig | 12 +
> drivers/dma/Makefile | 1 +
> drivers/dma/tegra186-gpc-dma.c | 1354 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1367 insertions(+)
> create mode 100644 drivers/dma/tegra186-gpc-dma.c
...
> +static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
> + dma_cookie_t cookie,
> + struct dma_tx_state *txstate)
> +{
> + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> + struct tegra_dma_desc *dma_desc = NULL;
> + struct virt_dma_desc *vd;
> + unsigned int residual;
> + enum dma_status ret;
> + unsigned long flags;
> +
> + raw_spin_lock_irqsave(&tdc->lock, flags);
> +
> + ret = dma_cookie_status(dc, cookie, txstate);
> + if (ret == DMA_COMPLETE) {
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> + return ret;
> + }
> +
> + vd = vchan_find_desc(&tdc->vc, cookie);
> + if (vd)
> + dma_desc = vd_to_tegra_dma_desc(vd);
This first case implies that the transfer has not started yet and so the
residual is just dma_desc->bytes_requested.
> + else if (tdc->dma_desc && tdc->dma_desc->vd.tx.cookie == cookie)
> + dma_desc = tdc->dma_desc;
> +
> + if (dma_desc) {
> + residual = dma_desc->bytes_requested -
> + (dma_desc->bytes_transferred %
> + dma_desc->bytes_requested);
> + dma_set_residue(txstate, residual);
> + } else {
> + dev_err(tdc2dev(tdc), "cookie %d is not found\n", cookie);
> + }
> +
> + raw_spin_unlock_irqrestore(&tdc->lock, flags);
> + return ret;
> +}
> +
> +static inline int get_bus_width(struct tegra_dma_channel *tdc,
> + enum dma_slave_buswidth slave_bw)
> +{
> + switch (slave_bw) {
> + case DMA_SLAVE_BUSWIDTH_1_BYTE:
> + return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8;
> + case DMA_SLAVE_BUSWIDTH_2_BYTES:
> + return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16;
> + case DMA_SLAVE_BUSWIDTH_4_BYTES:
> + return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32;
> + default:
> + dev_err(tdc2dev(tdc), "given slave bus width is not supported\n");
> + return -EINVAL;
> + }
> +}
> +
> +static inline int get_burst_size_by_len(int len)
> +{
> + int ret;
> +
> + /* Get burst size based on the first set bit */
> + switch (ffs(len)) {
> + case 0:
> + case 1:
> + case 2:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
> + break;
> + case 3:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
> + break;
> + case 4:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
> + break;
> + case 5:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
> + break;
> + default:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
> + break;
> + }
> +
> + return ret;
> +}
> +
> +static inline int get_burst_size(struct tegra_dma_channel *tdc,
> + u32 burst_size,
> + enum dma_slave_buswidth slave_bw,
> + int len)
> +{
> + int burst_mmio_width, burst_byte, ret;
> +
> + /*
> + * burst_size from client is in terms of the bus_width.
> + * convert that into words.
> + */
> + burst_byte = burst_size * slave_bw;
> + burst_mmio_width = ffs(burst_byte / 4);
> +
> + /* Get burst size based on the first set bit */
> + switch (burst_mmio_width) {
> + case 0:
> + ret = get_burst_size_by_len(len);
> + break;
> + case 1:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_1;
> + break;
> + case 2:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_2;
> + break;
> + case 3:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_4;
> + break;
> + case 4:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_8;
> + break;
> + default:
> + ret = TEGRA_GPCDMA_MMIOSEQ_BURST_16;
> + break;
> + }
> +
> + return ret;
> +}
Something seems a bit odd here in the sense that if burst_mmio_width ==
0, we could still end up with a burst of 16? I am not sure I understand
this logic.
Jon
--
nvpublic
^ permalink raw reply [flat|nested] 18+ messages in thread
end of thread, other threads:[~2021-09-23 23:27 UTC | newest]
Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-17 14:11 [PATCH v6 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
2021-09-17 14:11 ` [PATCH v6 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
2021-09-17 14:11 ` [PATCH v6 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
2021-09-17 15:36 ` Jon Hunter
2021-09-22 14:46 ` Akhil R
2021-09-23 12:22 ` Jon Hunter
2021-09-23 12:51 ` Akhil R
2021-09-23 13:20 ` Jon Hunter
2021-09-17 14:11 ` [PATCH v6 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
2021-09-17 14:11 ` [PATCH v6 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
2021-09-23 7:51 ` [PATCH v7 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
2021-09-23 7:51 ` [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
2021-09-23 22:35 ` Jon Hunter
2021-09-23 7:51 ` [PATCH v7 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
2021-09-23 23:27 ` Jon Hunter
2021-09-23 7:51 ` [PATCH v7 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
2021-09-23 7:51 ` [PATCH v7 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
2021-09-23 23:20 ` Jon Hunter
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