Skip to content

Commit

Permalink
dmaengine: tegra210-adma: prepare for supporting newer Tegra chips
Browse files Browse the repository at this point in the history 
This is a preparatory patch to add support for Tegra186 and Tegra194 chips.
Following changes are necessary to make driver code generic.
 * chip_data structure is enhanced to have chip specific details and
   following are the additions to the structure
   * Offset addresses for ADMA global and channel registers
   * Offset values for Tx and Rx channel selection
   * Maximum supported Tx and Rx channels
   * Tx and Rx channel request mask
   * ADMA channel register space size
 * Make use of above chip_data to generalise the driver code

Support for Tegra186 and Tegra194 will be added in subsequent patches of
the series.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
  • Loading branch information
Sameer Pujar authored and Vinod Koul committed May 4, 2019
1 parent 0b515ab commit ded1f3d
Showing 1 changed file with 57 additions and 34 deletions.
91 changes: 57 additions & 34 deletions drivers/dma/tegra210-adma.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,10 +36,6 @@

#define ADMA_CH_INT_CLEAR 0x1c
#define ADMA_CH_CTRL 0x24
#define ADMA_CH_CTRL_TX_REQ(val) (((val) & 0xf) << 28)
#define ADMA_CH_CTRL_TX_REQ_MAX 10
#define ADMA_CH_CTRL_RX_REQ(val) (((val) & 0xf) << 24)
#define ADMA_CH_CTRL_RX_REQ_MAX 10
#define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12)
#define ADMA_CH_CTRL_DIR_AHUB2MEM 2
#define ADMA_CH_CTRL_DIR_MEM2AHUB 4
Expand All @@ -57,8 +53,8 @@
#define ADMA_CH_FIFO_CTRL 0x2c
#define ADMA_CH_FIFO_CTRL_OVRFW_THRES(val) (((val) & 0xf) << 24)
#define ADMA_CH_FIFO_CTRL_STARV_THRES(val) (((val) & 0xf) << 16)
#define ADMA_CH_FIFO_CTRL_TX_SIZE(val) (((val) & 0xf) << 8)
#define ADMA_CH_FIFO_CTRL_RX_SIZE(val) ((val) & 0xf)
#define ADMA_CH_FIFO_CTRL_TX_FIFO_SIZE_SHIFT 8
#define ADMA_CH_FIFO_CTRL_RX_FIFO_SIZE_SHIFT 0

#define ADMA_CH_LOWER_SRC_ADDR 0x34
#define ADMA_CH_LOWER_TRG_ADDR 0x3c
Expand All @@ -68,25 +64,38 @@
#define ADMA_CH_XFER_STATUS 0x54
#define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff

#define ADMA_GLOBAL_CMD 0xc00
#define ADMA_GLOBAL_SOFT_RESET 0xc04
#define ADMA_GLOBAL_INT_CLEAR 0xc20
#define ADMA_GLOBAL_CTRL 0xc24

#define ADMA_CH_REG_OFFSET(a) (a * 0x80)
#define ADMA_GLOBAL_CMD 0x00
#define ADMA_GLOBAL_SOFT_RESET 0x04

#define ADMA_CH_FIFO_CTRL_DEFAULT (ADMA_CH_FIFO_CTRL_OVRFW_THRES(1) | \
ADMA_CH_FIFO_CTRL_STARV_THRES(1) | \
ADMA_CH_FIFO_CTRL_TX_SIZE(3) | \
ADMA_CH_FIFO_CTRL_RX_SIZE(3))
ADMA_CH_FIFO_CTRL_STARV_THRES(1))

#define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift)

struct tegra_adma;

/*
* struct tegra_adma_chip_data - Tegra chip specific data
* @global_reg_offset: Register offset of DMA global register.
* @global_int_clear: Register offset of DMA global interrupt clear.
* @ch_req_tx_shift: Register offset for AHUB transmit channel select.
* @ch_req_rx_shift: Register offset for AHUB receive channel select.
* @ch_base_offset: Reister offset of DMA channel registers.
* @ch_req_mask: Mask for Tx or Rx channel select.
* @ch_req_max: Maximum number of Tx or Rx channels available.
* @ch_reg_size: Size of DMA channel register space.
* @nr_channels: Number of DMA channels available.
*/
struct tegra_adma_chip_data {
int nr_channels;
unsigned int global_reg_offset;
unsigned int global_int_clear;
unsigned int ch_req_tx_shift;
unsigned int ch_req_rx_shift;
unsigned int ch_base_offset;
unsigned int ch_req_mask;
unsigned int ch_req_max;
unsigned int ch_reg_size;
unsigned int nr_channels;
};

/*
Expand Down Expand Up @@ -148,18 +157,20 @@ struct tegra_adma {
/* Used to store global command register state when suspending */
unsigned int global_cmd;

const struct tegra_adma_chip_data *cdata;

/* Last member of the structure */
struct tegra_adma_chan channels[0];
};

static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
{
writel(val, tdma->base_addr + reg);
writel(val, tdma->base_addr + tdma->cdata->global_reg_offset + reg);
}

static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
{
return readl(tdma->base_addr + reg);
return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg);
}

static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
Expand Down Expand Up @@ -209,14 +220,16 @@ static int tegra_adma_init(struct tegra_adma *tdma)
int ret;

/* Clear any interrupts */
tdma_write(tdma, ADMA_GLOBAL_INT_CLEAR, 0x1);
tdma_write(tdma, tdma->cdata->global_int_clear, 0x1);

/* Assert soft reset */
tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);

/* Wait for reset to clear */
ret = readx_poll_timeout(readl,
tdma->base_addr + ADMA_GLOBAL_SOFT_RESET,
tdma->base_addr +
tdma->cdata->global_reg_offset +
ADMA_GLOBAL_SOFT_RESET,
status, status == 0, 20, 10000);
if (ret)
return ret;
Expand All @@ -236,25 +249,20 @@ static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
if (tdc->sreq_reserved)
return tdc->sreq_dir == direction ? 0 : -EINVAL;

if (sreq_index > tdma->cdata->ch_req_max) {
dev_err(tdma->dev, "invalid DMA request\n");
return -EINVAL;
}

switch (direction) {
case DMA_MEM_TO_DEV:
if (sreq_index > ADMA_CH_CTRL_TX_REQ_MAX) {
dev_err(tdma->dev, "invalid DMA request\n");
return -EINVAL;
}

if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
dev_err(tdma->dev, "DMA request reserved\n");
return -EINVAL;
}
break;

case DMA_DEV_TO_MEM:
if (sreq_index > ADMA_CH_CTRL_RX_REQ_MAX) {
dev_err(tdma->dev, "invalid DMA request\n");
return -EINVAL;
}

if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
dev_err(tdma->dev, "DMA request reserved\n");
return -EINVAL;
Expand Down Expand Up @@ -487,6 +495,7 @@ static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
enum dma_transfer_direction direction)
{
struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata;
unsigned int burst_size, adma_dir;

if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
Expand All @@ -497,15 +506,19 @@ static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
burst_size = fls(tdc->sconfig.dst_maxburst);
ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
ch_regs->ctrl = ADMA_CH_CTRL_TX_REQ(tdc->sreq_index);
ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
cdata->ch_req_mask,
cdata->ch_req_tx_shift);
ch_regs->src_addr = buf_addr;
break;

case DMA_DEV_TO_MEM:
adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
burst_size = fls(tdc->sconfig.src_maxburst);
ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->sreq_index);
ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
cdata->ch_req_mask,
cdata->ch_req_rx_shift);
ch_regs->trg_addr = buf_addr;
break;

Expand Down Expand Up @@ -658,7 +671,15 @@ static int tegra_adma_runtime_resume(struct device *dev)
}

static const struct tegra_adma_chip_data tegra210_chip_data = {
.nr_channels = 22,
.global_reg_offset = 0xc00,
.global_int_clear = 0x20,
.ch_req_tx_shift = 28,
.ch_req_rx_shift = 24,
.ch_base_offset = 0,
.ch_req_mask = 0xf,
.ch_req_max = 10,
.ch_reg_size = 0x80,
.nr_channels = 22,
};

static const struct of_device_id tegra_adma_of_match[] = {
Expand Down Expand Up @@ -687,6 +708,7 @@ static int tegra_adma_probe(struct platform_device *pdev)
return -ENOMEM;

tdma->dev = &pdev->dev;
tdma->cdata = cdata;
tdma->nr_channels = cdata->nr_channels;
platform_set_drvdata(pdev, tdma);

Expand Down Expand Up @@ -715,7 +737,8 @@ static int tegra_adma_probe(struct platform_device *pdev)
for (i = 0; i < tdma->nr_channels; i++) {
struct tegra_adma_chan *tdc = &tdma->channels[i];

tdc->chan_addr = tdma->base_addr + ADMA_CH_REG_OFFSET(i);
tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
+ (cdata->ch_reg_size * i);

tdc->irq = of_irq_get(pdev->dev.of_node, i);
if (tdc->irq <= 0) {
Expand Down

0 comments on commit ded1f3d

Please sign in to comment.