[RFC PATCH 7/7] DMA: tegra-adma: Add support for Tegra210 ADMA
From: Jon Hunter
Date: Tue Aug 18 2015 - 09:50:42 EST
Add support for the Tegra210 Audio DMA controller that is used for
transferring data between system memory and the Audio sub-system.
This driver is based upon the work by Dara Ramesh <dramesh@xxxxxxxxxx>.
Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
---
drivers/dma/Kconfig | 12 +
drivers/dma/Makefile | 1 +
drivers/dma/tegra-common.c | 3 +-
drivers/dma/tegra-common.h | 42 ++-
drivers/dma/tegra20-apb-dma.c | 37 +--
drivers/dma/tegra210-adma.c | 710 ++++++++++++++++++++++++++++++++++++++++++
6 files changed, 782 insertions(+), 23 deletions(-)
create mode 100644 drivers/dma/tegra210-adma.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index dd79b0bf0876..25b474965d66 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -205,6 +205,18 @@ config TEGRA20_APB_DMA
This DMA controller transfers data from memory to peripheral fifo
or vice versa. It does not support memory to memory data transfer.
+config TEGRA210_ADMA
+ bool "NVIDIA Tegra210 ADMA support"
+ depends on ARCH_TEGRA
+ select DMA_ENGINE
+ select TEGRA_DMA_COMMON
+ help
+ Support for the NVIDIA Tegra210 ADMA controller driver. The
+ DMA controller is having multiple DMA channel and it configured
+ for audio. This DMA controller transfers data from memory to
+ peripheral fifo or vice versa. It does not support memory to
+ memory data transfer.
+
config S3C24XX_DMAC
tristate "Samsung S3C24XX DMA support"
depends on ARCH_S3C24XX
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index d9c2bf5ef0bd..9c5b8afc53a1 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_SIRF_DMA) += sirf-dma.o
obj-$(CONFIG_TI_EDMA) += edma.o
obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
+obj-$(CONFIG_TEGRA210_ADMA) += tegra210-adma.o
obj-$(CONFIG_TEGRA_DMA_COMMON) += tegra-common.o
obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
obj-$(CONFIG_PL330_DMA) += pl330.o
diff --git a/drivers/dma/tegra-common.c b/drivers/dma/tegra-common.c
index fff0a143f5bb..b3f7e3322c15 100644
--- a/drivers/dma/tegra-common.c
+++ b/drivers/dma/tegra-common.c
@@ -620,7 +620,8 @@ struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
return NULL;
}
- if (ops->get_xfer_params_cyclic(tdc, &sg_base, direction, flags) < 0)
+ if (ops->get_xfer_params_cyclic(tdc, &sg_base, buf_len, period_len,
+ direction, flags) < 0)
return NULL;
dma_desc = tegra_dma_desc_get(tdc);
diff --git a/drivers/dma/tegra-common.h b/drivers/dma/tegra-common.h
index e0d4d2b13cb8..c1a369e7efa6 100644
--- a/drivers/dma/tegra-common.h
+++ b/drivers/dma/tegra-common.h
@@ -34,7 +34,7 @@ struct tegra_dma_chip_data {
/*
* DMA channel registers
*/
-struct tegra_dma_channel_regs {
+struct tegra_apb_chan_regs {
unsigned long csr;
unsigned long ahb_ptr;
unsigned long apb_ptr;
@@ -44,6 +44,18 @@ struct tegra_dma_channel_regs {
};
/*
+ * ADMA channel registers
+ */
+struct tegra_adma_chan_regs {
+ unsigned long ctrl;
+ unsigned long config;
+ unsigned long src_ptr;
+ unsigned long tgt_ptr;
+ unsigned long ahub_fifo_ctrl;
+ unsigned long tc;
+};
+
+/*
* tegra_dma_sg_req: Dma request details to configure hardware. This
* contains the details for one transfer to configure DMA hw.
* The client's request for data transfer can be broken into multiple
@@ -52,7 +64,10 @@ struct tegra_dma_channel_regs {
* DMA descriptor which manages the transfer details.
*/
struct tegra_dma_sg_req {
- struct tegra_dma_channel_regs ch_regs;
+ union {
+ struct tegra_apb_chan_regs apb_ch_regs;
+ struct tegra_adma_chan_regs adma_ch_regs;
+ };
int req_len;
bool configured;
bool last_sg;
@@ -109,7 +124,10 @@ struct tegra_dma_channel {
/* Channel-slave specific configuration */
unsigned int slave_id;
struct dma_slave_config dma_sconfig;
- struct tegra_dma_channel_regs channel_reg;
+ union {
+ struct tegra_apb_chan_regs apb_ch_regs;
+ struct tegra_adma_chan_regs adma_ch_regs;
+ };
};
/*
@@ -119,6 +137,7 @@ struct tegra_dma_ops {
u32 (*get_xfer_count)(struct tegra_dma_channel *tdc);
int (*get_xfer_params_cyclic)(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req,
+ size_t buf_len, size_t period_len,
enum dma_transfer_direction direction,
unsigned int flags);
int (*get_xfer_params_sg)(struct tegra_dma_channel *tdc,
@@ -149,6 +168,7 @@ struct tegra_dma {
struct dma_device dma_dev;
struct device *dev;
struct clk *dma_clk;
+ struct clk *domain_clk;
struct reset_control *rst;
spinlock_t global_lock;
void __iomem *base_addr;
@@ -163,7 +183,10 @@ struct tegra_dma {
u32 global_pause_count;
/* Some register need to be cache before suspend */
- u32 reg_gen;
+ union {
+ u32 reg_gen;
+ u32 reg_global;
+ };
/* Last member of the structure */
struct tegra_dma_channel channels[0];
@@ -190,6 +213,17 @@ static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
return readl(tdc->chan_addr + reg);
}
+static inline void tdc_set_field(struct tegra_dma_channel *tdc, u32 reg,
+ u32 shift, u32 mask, u32 val)
+{
+ u32 t;
+
+ t = tdc_read(tdc, reg);
+ t &= ~(mask << shift);
+ t |= (val & mask) << shift;
+ tdc_write(tdc, reg, t);
+}
+
static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
{
return container_of(dc, struct tegra_dma_channel, dma_chan);
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 0895732aaa28..b800f10860eb 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -188,13 +188,13 @@ static u32 tegra_dma_irq_clear(struct tegra_dma_channel *tdc)
static void tegra_dma_program(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *nsg_req)
{
- tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr);
- tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->apb_ch_regs.apb_ptr);
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->apb_ch_regs.ahb_ptr);
if (tdc->tdma->chip_data->support_separate_wcount_reg)
tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
- nsg_req->ch_regs.wcount);
+ nsg_req->apb_ch_regs.wcount);
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
- nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
+ nsg_req->apb_ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
nsg_req->configured = true;
}
@@ -246,7 +246,7 @@ static void tegra_dma_stop(struct tegra_dma_channel *tdc)
static void tegra_dma_start(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req)
{
- struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
+ struct tegra_apb_chan_regs *ch_regs = &sg_req->apb_ch_regs;
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, ch_regs->csr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_regs->apb_seq);
@@ -327,7 +327,7 @@ static inline int get_burst_size(struct tegra_dma_channel *tdc,
}
static int tegra_dma_get_xfer_params(struct tegra_dma_channel *tdc,
- struct tegra_dma_channel_regs *ch_regs,
+ struct tegra_apb_chan_regs *ch_regs,
enum dma_transfer_direction direction,
unsigned int flags)
{
@@ -367,7 +367,7 @@ static int tegra_dma_get_xfer_params_sg(struct tegra_dma_channel *tdc,
enum dma_transfer_direction direction,
unsigned int flags)
{
- struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
+ struct tegra_apb_chan_regs *ch_regs = &sg_req->apb_ch_regs;
int ret;
ret = tegra_dma_get_xfer_params(tdc, ch_regs, direction, flags);
@@ -381,16 +381,17 @@ static int tegra_dma_get_xfer_params_sg(struct tegra_dma_channel *tdc,
static int tegra_dma_get_xfer_params_cyclic(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req,
+ size_t buf_len, size_t period_len,
enum dma_transfer_direction direction,
unsigned int flags)
{
- struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
+ struct tegra_apb_chan_regs *ch_regs = &sg_req->apb_ch_regs;
return tegra_dma_get_xfer_params(tdc, ch_regs, direction, flags);
}
static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc,
- struct tegra_dma_channel_regs *ch_regs, u32 len)
+ struct tegra_apb_chan_regs *ch_regs, u32 len)
{
u32 len_field = (len - 4) & 0xFFFC;
@@ -406,13 +407,13 @@ static void tegra_dma_set_xfer_params(struct tegra_dma_channel *tdc,
enum dma_transfer_direction direction,
u32 mem, u32 len)
{
- sg_req->ch_regs.ahb_seq |= get_burst_size(tdc, direction, len);
- sg_req->ch_regs.apb_ptr = sg_base->ch_regs.apb_ptr;
- sg_req->ch_regs.ahb_ptr = mem;
- sg_req->ch_regs.csr = sg_base->ch_regs.csr;
- tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len);
- sg_req->ch_regs.apb_seq = sg_base->ch_regs.apb_seq;
- sg_req->ch_regs.ahb_seq = sg_base->ch_regs.ahb_seq;
+ sg_req->apb_ch_regs.ahb_seq |= get_burst_size(tdc, direction, len);
+ sg_req->apb_ch_regs.apb_ptr = sg_base->apb_ch_regs.apb_ptr;
+ sg_req->apb_ch_regs.ahb_ptr = mem;
+ sg_req->apb_ch_regs.csr = sg_base->apb_ch_regs.csr;
+ tegra_dma_prep_wcount(tdc, &sg_req->apb_ch_regs, len);
+ sg_req->apb_ch_regs.apb_seq = sg_base->apb_ch_regs.apb_seq;
+ sg_req->apb_ch_regs.ahb_seq = sg_base->apb_ch_regs.ahb_seq;
sg_req->configured = false;
sg_req->last_sg = false;
sg_req->req_len = len;
@@ -742,7 +743,7 @@ static int tegra_dma_pm_suspend(struct device *dev)
tdma->reg_gen = tdma_read(tdma, TEGRA_APBDMA_GENERAL);
for (i = 0; i < tdma->chip_data->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
- struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
+ struct tegra_apb_chan_regs *ch_reg = &tdc->apb_ch_regs;
ch_reg->csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
ch_reg->ahb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBPTR);
@@ -773,7 +774,7 @@ static int tegra_dma_pm_resume(struct device *dev)
for (i = 0; i < tdma->chip_data->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
- struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
+ struct tegra_apb_chan_regs *ch_reg = &tdc->apb_ch_regs;
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_reg->apb_seq);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_reg->apb_ptr);
diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
new file mode 100644
index 000000000000..23e4ee15f147
--- /dev/null
+++ b/drivers/dma/tegra210-adma.c
@@ -0,0 +1,710 @@
+/*
+ * ADMA driver for Nvidia's Tegra210 ADMA controller.
+ *
+ * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.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/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/clk/tegra.h>
+
+#include "dmaengine.h"
+
+#include "tegra-common.h"
+
+/* Register offsets from ADMA*_BASE */
+#define ADMA_CH_CMD 0x00
+#define ADMA_CH_STATUS 0x0c
+#define ADMA_CH_STATUS_TRANSFER_PAUSED BIT(1)
+#define ADMA_CH_STATUS_TRANSFER_ENABLED BIT(0)
+
+#define ADMA_CH_INT_STATUS 0x10
+#define ADMA_CH_INT_TD_STATUS BIT(0)
+
+#define ADMA_CH_INT_CLEAR 0x1c
+#define ADMA_CH_CTRL 0x24
+#define ADMA_CH_CTRL_TX_REQUEST_SELECT_SHIFT 28
+#define ADMA_CH_CTRL_TX_REQUEST_SELECT_MASK \
+ (0xf << ADMA_CH_CTRL_TX_REQUEST_SELECT_SHIFT)
+#define ADMA_CH_CTRL_RX_REQUEST_SELECT_SHIFT 24
+#define ADMA_CH_CTRL_RX_REQUEST_SELECT_MASK \
+ (0xf << ADMA_CH_CTRL_RX_REQUEST_SELECT_SHIFT)
+#define ADMA_CH_CTRL_TRANSFER_DIRECTION_SHIFT 12
+#define ADMA_CH_CTRL_TRANSFER_DIRECTION_MASK \
+ (0xf << ADMA_CH_CTRL_TRANSFER_DIRECTION_SHIFT)
+#define ADMA_CH_CTRL_TRANSFER_MODE_SHIFT 8
+#define ADMA_CH_CTRL_TRANSFER_MODE_MASK \
+ (0x7 << ADMA_CH_CTRL_TRANSFER_MODE_SHIFT)
+#define ADMA_CH_CTRL_TRANSFER_PAUSE_SHIFT 0
+#define ADMA_CH_CTRL_TRANSFER_PAUSE_MASK \
+ (0x1 << ADMA_CH_CTRL_TRANSFER_PAUSE_SHIFT)
+#define ADMA_CH_CTRL_TRANSFER_PAUSE BIT(0)
+
+#define ADMA_CH_CONFIG 0x28
+#define ADMA_CH_CONFIG_SOURCE_MEMORY_BUFFER_SHIFT 28
+#define ADMA_CH_CONFIG_SOURCE_MEMORY_BUFFER_MASK \
+ (0x7 << ADMA_CH_CONFIG_SOURCE_MEMORY_BUFFER_SHIFT)
+#define ADMA_CH_CONFIG_TARGET_MEMORY_BUFFER_SHIFT 24
+#define ADMA_CH_CONFIG_TARGET_MEMORY_BUFFER_MASK \
+ (0x7 << ADMA_CH_CONFIG_TARGET_MEMORY_BUFFER_SHIFT)
+#define ADMA_CH_CONFIG_BURST_SIZE_SHIFT 20
+#define ADMA_CH_CONFIG_BURST_SIZE_MASK \
+ (0x7 << ADMA_CH_CONFIG_BURST_SIZE_SHIFT)
+#define ADMA_CH_CONFIG_MAX_MEM_BUFFERS 8
+
+#define ADMA_CH_AHUB_FIFO_CTRL 0x2c
+#define ADMA_CH_AHUB_FIFO_CTRL_FETCHING_POLICY_SHIFT 31
+#define ADMA_CH_AHUB_FIFO_CTRL_TX_FIFO_SIZE_SHIFT 8
+#define ADMA_CH_AHUB_FIFO_CTRL_TX_FIFO_SIZE_MASK \
+ (0xf << ADMA_CH_AHUB_FIFO_CTRL_TX_FIFO_SIZE_SHIFT)
+#define ADMA_CH_AHUB_FIFO_CTRL_RX_FIFO_SIZE_SHIFT 0
+#define ADMA_CH_AHUB_FIFO_CTRL_RX_FIFO_SIZE_MASK \
+ (0xf << ADMA_CH_AHUB_FIFO_CTRL_RX_FIFO_SIZE_SHIFT)
+
+#define ADMA_CH_TC_STATUS 0x30
+#define ADMA_CH_TC_STATUS_COUNT_MASK 0x3ffffffc
+
+#define ADMA_CH_LOWER_SOURCE_ADDR 0x34
+#define ADMA_CH_LOWER_TARGET_ADDR 0x3c
+#define ADMA_CH_TC 0x44
+
+#define ADMA_GLOBAL_CMD 0xc00
+#define ADMA_GLOBAL_SOFT_RESET 0xc04
+#define ADMA_GLOBAL_INT_CLEAR 0xc20
+#define ADMA_GLOBAL_CTRL 0xc24
+
+#define ADMA_BURSTSIZE_16 5
+#define ADMA_FIFO_DEFAULT_SIZE 3
+#define ADMA_MODE_ONESHOT 1
+#define ADMA_MODE_CONTINUOUS 2
+#define AHUB_TO_MEMORY 2
+#define MEMORY_TO_AHUB 4
+
+/*
+ * If any burst is in flight and ADMA paused then this is the time to complete
+ * on-flight burst and update ADMA status register.
+ */
+#define TEGRA_ADMA_BURST_COMPLETE_TIME 20
+
+static int tegra_adma_runtime_suspend(struct device *dev);
+static int tegra_adma_runtime_resume(struct device *dev);
+
+static int tegra_adma_global_soft_reset(struct tegra_dma *tdma)
+{
+ u32 status;
+
+ /* Clear any interrupts */
+ tdma_write(tdma, ADMA_GLOBAL_INT_CLEAR, 0x1);
+
+ /* Assert soft reset */
+ tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
+
+ /* Wait for reset to clear */
+ return readx_poll_timeout(readl,
+ tdma->base_addr + ADMA_GLOBAL_SOFT_RESET,
+ status, status == 0,
+ TEGRA_ADMA_BURST_COMPLETE_TIME, 10000);
+}
+
+static u32 tegra_adma_get_xfer_count(struct tegra_dma_channel *tdc)
+{
+ u32 wcount = tdc_read(tdc, ADMA_CH_TC_STATUS);
+
+ return wcount & ADMA_CH_TC_STATUS_COUNT_MASK;
+}
+
+static u32 tegra_adma_irq_status(struct tegra_dma_channel *tdc)
+{
+ u32 status = tdc_read(tdc, ADMA_CH_INT_STATUS);
+
+ return status & ADMA_CH_INT_TD_STATUS;
+}
+
+static u32 tegra_adma_irq_clear(struct tegra_dma_channel *tdc)
+{
+ u32 status = tegra_adma_irq_status(tdc);
+
+ if (status) {
+ dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
+ tdc_write(tdc, ADMA_CH_INT_CLEAR, status);
+ }
+
+ return status;
+}
+
+static void tegra_adma_pause(struct tegra_dma_channel *tdc,
+ bool wait_for_burst_complete)
+{
+ u32 status;
+
+ tdc_set_field(tdc, ADMA_CH_CTRL, ADMA_CH_CTRL_TRANSFER_PAUSE_SHIFT,
+ ADMA_CH_CTRL_TRANSFER_PAUSE_MASK, 1);
+
+ if (readx_poll_timeout(readl, tdc->chan_addr + ADMA_CH_STATUS, status,
+ status & ADMA_CH_STATUS_TRANSFER_PAUSED,
+ TEGRA_ADMA_BURST_COMPLETE_TIME, 10000))
+ dev_err(tdc2dev(tdc), "%s(): unable to pause DMA\n", __func__);
+}
+
+static void tegra_adma_program(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *nsg_req)
+{
+ tdc_write(tdc, ADMA_CH_LOWER_SOURCE_ADDR,
+ nsg_req->adma_ch_regs.src_ptr);
+ tdc_write(tdc, ADMA_CH_LOWER_TARGET_ADDR,
+ nsg_req->adma_ch_regs.tgt_ptr);
+ tdc_write(tdc, ADMA_CH_TC, nsg_req->adma_ch_regs.tc);
+ tdc_write(tdc, ADMA_CH_CTRL, nsg_req->adma_ch_regs.ctrl);
+ tdc_write(tdc, ADMA_CH_AHUB_FIFO_CTRL,
+ nsg_req->adma_ch_regs.ahub_fifo_ctrl);
+ tdc_write(tdc, ADMA_CH_CONFIG, nsg_req->adma_ch_regs.config);
+ tdc_write(tdc, ADMA_CH_CMD, 1);
+ nsg_req->configured = true;
+}
+
+static void tegra_adma_resume(struct tegra_dma_channel *tdc)
+{
+ tdc_set_field(tdc, ADMA_CH_CTRL, ADMA_CH_CTRL_TRANSFER_PAUSE_SHIFT,
+ ADMA_CH_CTRL_TRANSFER_PAUSE_MASK, 0);
+}
+
+static void tegra_adma_stop(struct tegra_dma_channel *tdc)
+{
+ u32 status;
+
+ /* TODO: Do we need to disable interrupts here? */
+
+ /* Disable ADMA */
+ tdc_write(tdc, ADMA_CH_CMD, 0);
+
+ /* Clear interrupt status */
+ tegra_adma_irq_clear(tdc);
+
+ if (readx_poll_timeout(readl, tdc->chan_addr + ADMA_CH_STATUS, status,
+ !(status & ADMA_CH_STATUS_TRANSFER_ENABLED),
+ TEGRA_ADMA_BURST_COMPLETE_TIME, 10000))
+ dev_err(tdc2dev(tdc), "%s(): unable to stop DMA\n", __func__);
+ else
+ tdc->busy = false;
+}
+
+static void tegra_adma_start(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_req)
+{
+ struct tegra_adma_chan_regs *ch_regs = &sg_req->adma_ch_regs;
+
+ /* Update transfer done count for position calculation */
+ tdc->adma_ch_regs.tc = ch_regs->tc;
+ tdc_write(tdc, ADMA_CH_TC, ch_regs->tc);
+ tdc_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
+ tdc_write(tdc, ADMA_CH_LOWER_SOURCE_ADDR, ch_regs->src_ptr);
+ tdc_write(tdc, ADMA_CH_LOWER_TARGET_ADDR, ch_regs->tgt_ptr);
+ tdc_write(tdc, ADMA_CH_AHUB_FIFO_CTRL, ch_regs->ahub_fifo_ctrl);
+ tdc_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
+ /* Start ADMA */
+ tdc_write(tdc, ADMA_CH_CMD, 1);
+}
+
+static int tegra_adma_get_xfer_params(struct tegra_dma_channel *tdc,
+ struct tegra_adma_chan_regs *ch_regs,
+ enum dma_transfer_direction direction)
+{
+ u32 burst_size, ctrl, ctrl_mask, slave_id, fifo_mask, fifo_shift;
+
+ ch_regs->ahub_fifo_ctrl = tdc_read(tdc, ADMA_CH_AHUB_FIFO_CTRL);
+ ch_regs->config = tdc_read(tdc, ADMA_CH_CONFIG);
+ ch_regs->ctrl = tdc_read(tdc, ADMA_CH_CTRL);
+ slave_id = tdc->dma_sconfig.slave_id;
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ burst_size = fls(tdc->dma_sconfig.dst_maxburst);
+ ctrl_mask = ADMA_CH_CTRL_TX_REQUEST_SELECT_MASK;
+ ctrl = MEMORY_TO_AHUB << ADMA_CH_CTRL_TRANSFER_DIRECTION_SHIFT;
+ ctrl |= slave_id << ADMA_CH_CTRL_TX_REQUEST_SELECT_SHIFT;
+ fifo_mask = ADMA_CH_AHUB_FIFO_CTRL_TX_FIFO_SIZE_MASK;
+ fifo_shift = ADMA_CH_AHUB_FIFO_CTRL_TX_FIFO_SIZE_SHIFT;
+ break;
+ case DMA_DEV_TO_MEM:
+ burst_size = fls(tdc->dma_sconfig.src_maxburst);
+ ctrl_mask = ADMA_CH_CTRL_RX_REQUEST_SELECT_MASK;
+ ctrl = AHUB_TO_MEMORY << ADMA_CH_CTRL_TRANSFER_DIRECTION_SHIFT;
+ ctrl |= slave_id << ADMA_CH_CTRL_RX_REQUEST_SELECT_SHIFT;
+ fifo_mask = ADMA_CH_AHUB_FIFO_CTRL_RX_FIFO_SIZE_MASK;
+ fifo_shift = ADMA_CH_AHUB_FIFO_CTRL_RX_FIFO_SIZE_SHIFT;
+ break;
+ default:
+ dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
+ return -EINVAL;
+ }
+
+ if (!burst_size || burst_size > ADMA_BURSTSIZE_16)
+ burst_size = ADMA_BURSTSIZE_16;
+
+ ch_regs->ahub_fifo_ctrl &= ~fifo_mask;
+ ch_regs->ahub_fifo_ctrl |= ADMA_FIFO_DEFAULT_SIZE << fifo_shift;
+ ch_regs->config &= ~ADMA_CH_CONFIG_BURST_SIZE_MASK;
+ ch_regs->config |= burst_size << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
+ ch_regs->ctrl &= ~(ctrl_mask | ADMA_CH_CTRL_TRANSFER_DIRECTION_MASK);
+ ch_regs->ctrl |= ctrl;
+
+ return -EINVAL;
+}
+
+static int tegra_adma_get_xfer_params_sg(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_base,
+ enum dma_transfer_direction direction,
+ unsigned int flags)
+{
+ struct tegra_adma_chan_regs *ch_regs = &sg_base->adma_ch_regs;
+ int ret;
+
+ ret = tegra_adma_get_xfer_params(tdc, ch_regs, direction);
+ if (ret < 0)
+ return ret;
+
+ ch_regs->ctrl &= ~ADMA_CH_CTRL_TRANSFER_MODE_MASK;
+ ch_regs->ctrl |= ADMA_MODE_ONESHOT << ADMA_CH_CTRL_TRANSFER_MODE_SHIFT;
+
+ return 0;
+}
+
+static int tegra_adma_get_xfer_params_cyclic(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_base,
+ size_t buf_len, size_t period_len,
+ enum dma_transfer_direction direction,
+ unsigned int flags)
+{
+ struct tegra_adma_chan_regs *ch_regs = &sg_base->adma_ch_regs;
+ unsigned int num_bufs, mask, shift;
+ int ret;
+
+ ret = tegra_adma_get_xfer_params(tdc, ch_regs, direction);
+ if (ret < 0)
+ return ret;
+
+ ch_regs->ctrl &= ~ADMA_CH_CTRL_TRANSFER_MODE_MASK;
+ ch_regs->ctrl |= ADMA_MODE_CONTINUOUS <<
+ ADMA_CH_CTRL_TRANSFER_MODE_SHIFT;
+
+ num_bufs = buf_len / period_len;
+
+ if (num_bufs <= ADMA_CH_CONFIG_MAX_MEM_BUFFERS) {
+ if (direction == DMA_MEM_TO_DEV) {
+ mask = ADMA_CH_CONFIG_SOURCE_MEMORY_BUFFER_MASK;
+ shift = ADMA_CH_CONFIG_SOURCE_MEMORY_BUFFER_SHIFT;
+ } else {
+ mask = ADMA_CH_CONFIG_TARGET_MEMORY_BUFFER_MASK;
+ shift = ADMA_CH_CONFIG_TARGET_MEMORY_BUFFER_SHIFT;
+ }
+ ch_regs->config &= ~mask;
+ ch_regs->config |= (num_bufs - 1) << shift;
+ }
+
+ return 0;
+}
+
+static void tegra_adma_set_xfer_params(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_req,
+ struct tegra_dma_sg_req *sg_base,
+ enum dma_transfer_direction direction,
+ u32 mem, u32 len)
+{
+ if (direction == DMA_MEM_TO_DEV)
+ sg_req->adma_ch_regs.src_ptr = mem;
+ else
+ sg_req->adma_ch_regs.tgt_ptr = mem;
+
+ sg_req->adma_ch_regs.tc = len;
+ sg_req->adma_ch_regs.ctrl = sg_base->adma_ch_regs.ctrl;
+ sg_req->adma_ch_regs.ahub_fifo_ctrl =
+ sg_base->adma_ch_regs.ahub_fifo_ctrl;
+ sg_req->adma_ch_regs.config = sg_base->adma_ch_regs.config;
+ sg_req->configured = false;
+ sg_req->last_sg = false;
+ sg_req->req_len = len;
+}
+
+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 dma_chan *chan;
+
+ chan = dma_get_any_slave_channel(&tdma->dma_dev);
+ if (!chan)
+ return NULL;
+
+ return chan;
+}
+
+static const struct tegra_dma_chip_data tegra210_adma_chip_data = {
+ .burst_time = TEGRA_ADMA_BURST_COMPLETE_TIME,
+ .channel_reg_size = 0x80,
+ .max_dma_count = 1024UL * 64,
+ .nr_channels = 10,
+};
+
+static const struct of_device_id tegra_adma_of_match[] = {
+ {
+ .compatible = "nvidia,tegra210-adma",
+ .data = &tegra210_adma_chip_data,
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
+
+static struct platform_device_id tegra_adma_devtype[] = {
+ {
+ .name = "tegra210-adma",
+ .driver_data = (unsigned long)&tegra210_adma_chip_data,
+ },
+};
+
+static const struct tegra_dma_ops tegra_adma_ops = {
+ .get_xfer_count = tegra_adma_get_xfer_count,
+ .get_xfer_params_sg = tegra_adma_get_xfer_params_sg,
+ .get_xfer_params_cyclic = tegra_adma_get_xfer_params_cyclic,
+ .irq_clear = tegra_adma_irq_clear,
+ .irq_status = tegra_adma_irq_status,
+ .pause = tegra_adma_pause,
+ .program = tegra_adma_program,
+ .resume = tegra_adma_resume,
+ .set_xfer_params = tegra_adma_set_xfer_params,
+ .start = tegra_adma_start,
+ .stop = tegra_adma_stop,
+};
+
+static struct device *dma_device;
+
+static int tegra_adma_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct tegra_dma *tdma;
+ int ret, i;
+
+ const struct tegra_dma_chip_data *cdata = NULL;
+ const struct of_device_id *match;
+
+ if (!pdev->dev.of_node) {
+ dev_err(&pdev->dev, "No device tree node for ADMA driver");
+ return -ENODEV;
+ }
+
+ match = of_match_device(of_match_ptr(tegra_adma_of_match),
+ &pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "Error: No device match found\n");
+ return -ENODEV;
+ }
+ cdata = match->data;
+
+ 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);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "No mem resource for ADMA\n");
+ return -EINVAL;
+ }
+
+ tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(tdma->base_addr))
+ return PTR_ERR(tdma->base_addr);
+
+ tdma->dma_clk = devm_clk_get(&pdev->dev, "adma");
+ if (IS_ERR(tdma->dma_clk)) {
+ dev_err(&pdev->dev, "Error: Missing controller clock\n");
+ return PTR_ERR(tdma->dma_clk);
+ }
+
+ tdma->domain_clk = devm_clk_get(&pdev->dev, "adma.ape");
+ if (IS_ERR(tdma->domain_clk)) {
+ dev_err(&pdev->dev, "Error: Missing APE clock\n");
+ return PTR_ERR(tdma->domain_clk);
+ }
+
+ spin_lock_init(&tdma->global_lock);
+
+ dma_device = &pdev->dev;
+
+ pm_runtime_enable(&pdev->dev);
+ if (!pm_runtime_enabled(&pdev->dev))
+ ret = tegra_adma_runtime_resume(&pdev->dev);
+ else
+ ret = pm_runtime_get_sync(&pdev->dev);
+
+ if (ret)
+ goto err_pm_disable;
+
+ /* Reset ADMA controller */
+ ret = tegra_adma_global_soft_reset(tdma);
+ if (ret)
+ return ret;
+
+ 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_addr = tdma->base_addr + cdata->channel_reg_size * i;
+
+ tdc->irq = platform_get_irq(pdev, i);
+ if (tdc->irq < 0) {
+ ret = -EPROBE_DEFER;
+ dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
+ goto err_irq;
+ }
+
+ snprintf(tdc->name, sizeof(tdc->name), "adma.%d", i);
+ ret = devm_request_irq(&pdev->dev, tdc->irq,
+ tegra_dma_isr, 0, tdc->name, tdc);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "request_irq failed with err %d channel %d\n",
+ ret, i);
+ goto err_irq;
+ }
+
+ tdc->dma_chan.device = &tdma->dma_dev;
+ dma_cookie_init(&tdc->dma_chan);
+ list_add_tail(&tdc->dma_chan.device_node,
+ &tdma->dma_dev.channels);
+ tdc->tdma = tdma;
+ tdc->id = i;
+
+ tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
+ (unsigned long)tdc);
+ spin_lock_init(&tdc->lock);
+
+ INIT_LIST_HEAD(&tdc->pending_sg_req);
+ INIT_LIST_HEAD(&tdc->free_sg_req);
+ INIT_LIST_HEAD(&tdc->free_dma_desc);
+ INIT_LIST_HEAD(&tdc->cb_desc);
+ }
+
+ dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
+
+ tdma->dma_dev.dev = &pdev->dev;
+ 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_cyclic = tegra_dma_prep_dma_cyclic;
+ tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
+ tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
+
+ tdma->ops = &tegra_adma_ops;
+
+ /* Enable global ADMA registers */
+ tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
+
+ ret = dma_async_device_register(&tdma->dma_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "Tegra210 ADMA driver registration failed %d\n", ret);
+ goto err_irq;
+ }
+
+ ret = of_dma_controller_register(pdev->dev.of_node,
+ tegra_dma_of_xlate, tdma);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "Tegra210 ADMA OF registration failed %d\n", ret);
+ goto err_unregister_dma_dev;
+ }
+
+ pm_runtime_put(&pdev->dev);
+
+ dev_info(&pdev->dev, "Tegra210 ADMA driver register %d channels\n",
+ cdata->nr_channels);
+ return 0;
+
+err_unregister_dma_dev:
+ dma_async_device_unregister(&tdma->dma_dev);
+err_irq:
+ while (--i >= 0) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ tasklet_kill(&tdc->tasklet);
+ }
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ tegra_adma_runtime_suspend(&pdev->dev);
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+
+ return ret;
+}
+
+static int tegra_adma_remove(struct platform_device *pdev)
+{
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+ int i;
+ struct tegra_dma_channel *tdc;
+
+ dma_async_device_unregister(&tdma->dma_dev);
+
+ for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
+ tdc = &tdma->channels[i];
+ tasklet_kill(&tdc->tasklet);
+ }
+
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ tegra_adma_runtime_suspend(&pdev->dev);
+
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static int tegra_adma_runtime_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(tdma->dma_clk);
+ clk_disable_unprepare(tdma->domain_clk);
+ return 0;
+}
+
+static int tegra_adma_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct tegra_dma *tdma = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = clk_prepare_enable(tdma->domain_clk);
+ if (ret < 0) {
+ dev_err(dev, "clk_prepare_enable failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(tdma->dma_clk);
+ if (ret < 0) {
+ dev_err(dev, "clk_prepare_enable failed: %d\n", ret);
+ return ret;
+ }
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tegra_adma_pm_suspend(struct device *dev)
+{
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
+ int i;
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ return ret;
+
+ tdma->reg_global = tdma_read(tdma, ADMA_GLOBAL_CMD);
+ for (i = 0; i < tdma->chip_data->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+ struct tegra_adma_chan_regs *ch_reg = &tdc->adma_ch_regs;
+
+ ch_reg->tc = tdc_read(tdc, ADMA_CH_TC);
+ ch_reg->src_ptr = tdc_read(tdc, ADMA_CH_LOWER_SOURCE_ADDR);
+ ch_reg->tgt_ptr = tdc_read(tdc, ADMA_CH_LOWER_TARGET_ADDR);
+ ch_reg->ctrl = tdc_read(tdc, ADMA_CH_CTRL);
+ ch_reg->ahub_fifo_ctrl =
+ tdc_read(tdc, ADMA_CH_AHUB_FIFO_CTRL);
+ ch_reg->config = tdc_read(tdc, ADMA_CH_CONFIG);
+ }
+ pm_runtime_put(dev);
+ return 0;
+}
+
+static int tegra_adma_pm_resume(struct device *dev)
+{
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
+ int i;
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ return ret;
+
+ tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->reg_global);
+
+ for (i = 0; i < tdma->chip_data->nr_channels; i++) {
+ struct tegra_dma_channel *tdc = &tdma->channels[i];
+ struct tegra_adma_chan_regs *ch_reg = &tdc->adma_ch_regs;
+
+ tdc_write(tdc, ADMA_CH_TC, ch_reg->tc);
+ tdc_write(tdc, ADMA_CH_LOWER_SOURCE_ADDR, ch_reg->src_ptr);
+ tdc_write(tdc, ADMA_CH_LOWER_TARGET_ADDR, ch_reg->tgt_ptr);
+ tdc_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
+ tdc_write(tdc, ADMA_CH_AHUB_FIFO_CTRL,
+ ch_reg->ahub_fifo_ctrl);
+ tdc_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
+ }
+ pm_runtime_put(dev);
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
+#ifdef CONFIG_PM
+ .runtime_suspend = tegra_adma_runtime_suspend,
+ .runtime_resume = tegra_adma_runtime_resume,
+#endif
+ SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, tegra_adma_pm_resume)
+};
+
+static struct platform_driver tegra_admac_driver = {
+ .driver = {
+ .name = "tegra-adma",
+ .owner = THIS_MODULE,
+ .pm = &tegra_adma_dev_pm_ops,
+ .of_match_table = of_match_ptr(tegra_adma_of_match),
+ },
+ .probe = tegra_adma_probe,
+ .remove = tegra_adma_remove,
+ .id_table = tegra_adma_devtype,
+};
+
+module_platform_driver(tegra_admac_driver);
+
+MODULE_ALIAS("platform:tegra210-adma");
+MODULE_DESCRIPTION("NVIDIA Tegra ADMA Controller driver");
+MODULE_AUTHOR("Dara Ramesh <dramesh@xxxxxxxxxx>");
+MODULE_AUTHOR("Jon Hunter <jonathanh@xxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
--
2.1.4
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