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spi/s3c64xx: Add support DMA engine API
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This patch adds to support DMA generic API to transfer raw
SPI data. Basiclly the spi driver uses DMA generic API if
architecture supports it. Otherwise, uses Samsung specific
S3C-PL330 APIs.

Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Boojin Kim authored and Vinod Koul committed Sep 14, 2011
1 parent 978ce50 commit 39d3e80
Showing 1 changed file with 69 additions and 72 deletions.
141 changes: 69 additions & 72 deletions drivers/spi/spi-s3c64xx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,9 @@ struct s3c64xx_spi_driver_data {
unsigned state;
unsigned cur_mode, cur_bpw;
unsigned cur_speed;
unsigned rx_ch;
unsigned tx_ch;
struct samsung_dma_ops *ops;
};

static struct s3c2410_dma_client s3c64xx_spi_dma_client = {
Expand Down Expand Up @@ -226,13 +229,46 @@ static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
writel(val, regs + S3C64XX_SPI_CH_CFG);
}

static void s3c64xx_spi_dma_rxcb(void *data)
{
struct s3c64xx_spi_driver_data *sdd
= (struct s3c64xx_spi_driver_data *)data;
unsigned long flags;

spin_lock_irqsave(&sdd->lock, flags);

sdd->state &= ~RXBUSY;
/* If the other done */
if (!(sdd->state & TXBUSY))
complete(&sdd->xfer_completion);

spin_unlock_irqrestore(&sdd->lock, flags);
}

static void s3c64xx_spi_dma_txcb(void *data)
{
struct s3c64xx_spi_driver_data *sdd
= (struct s3c64xx_spi_driver_data *)data;
unsigned long flags;

spin_lock_irqsave(&sdd->lock, flags);

sdd->state &= ~TXBUSY;
/* If the other done */
if (!(sdd->state & RXBUSY))
complete(&sdd->xfer_completion);

spin_unlock_irqrestore(&sdd->lock, flags);
}

static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
struct spi_device *spi,
struct spi_transfer *xfer, int dma_mode)
{
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
void __iomem *regs = sdd->regs;
u32 modecfg, chcfg;
struct samsung_dma_prep_info info;

modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
Expand All @@ -258,10 +294,14 @@ static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
chcfg |= S3C64XX_SPI_CH_TXCH_ON;
if (dma_mode) {
modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
s3c2410_dma_config(sdd->tx_dmach, sdd->cur_bpw / 8);
s3c2410_dma_enqueue(sdd->tx_dmach, (void *)sdd,
xfer->tx_dma, xfer->len);
s3c2410_dma_ctrl(sdd->tx_dmach, S3C2410_DMAOP_START);
info.cap = DMA_SLAVE;
info.direction = DMA_TO_DEVICE;
info.buf = xfer->tx_dma;
info.len = xfer->len;
info.fp = s3c64xx_spi_dma_txcb;
info.fp_param = sdd;
sdd->ops->prepare(sdd->tx_ch, &info);
sdd->ops->trigger(sdd->tx_ch);
} else {
switch (sdd->cur_bpw) {
case 32:
Expand Down Expand Up @@ -293,10 +333,14 @@ static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
| S3C64XX_SPI_PACKET_CNT_EN,
regs + S3C64XX_SPI_PACKET_CNT);
s3c2410_dma_config(sdd->rx_dmach, sdd->cur_bpw / 8);
s3c2410_dma_enqueue(sdd->rx_dmach, (void *)sdd,
xfer->rx_dma, xfer->len);
s3c2410_dma_ctrl(sdd->rx_dmach, S3C2410_DMAOP_START);
info.cap = DMA_SLAVE;
info.direction = DMA_FROM_DEVICE;
info.buf = xfer->rx_dma;
info.len = xfer->len;
info.fp = s3c64xx_spi_dma_rxcb;
info.fp_param = sdd;
sdd->ops->prepare(sdd->rx_ch, &info);
sdd->ops->trigger(sdd->rx_ch);
}
}

Expand Down Expand Up @@ -482,46 +526,6 @@ static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
}
}

static void s3c64xx_spi_dma_rxcb(struct s3c2410_dma_chan *chan, void *buf_id,
int size, enum s3c2410_dma_buffresult res)
{
struct s3c64xx_spi_driver_data *sdd = buf_id;
unsigned long flags;

spin_lock_irqsave(&sdd->lock, flags);

if (res == S3C2410_RES_OK)
sdd->state &= ~RXBUSY;
else
dev_err(&sdd->pdev->dev, "DmaAbrtRx-%d\n", size);

/* If the other done */
if (!(sdd->state & TXBUSY))
complete(&sdd->xfer_completion);

spin_unlock_irqrestore(&sdd->lock, flags);
}

static void s3c64xx_spi_dma_txcb(struct s3c2410_dma_chan *chan, void *buf_id,
int size, enum s3c2410_dma_buffresult res)
{
struct s3c64xx_spi_driver_data *sdd = buf_id;
unsigned long flags;

spin_lock_irqsave(&sdd->lock, flags);

if (res == S3C2410_RES_OK)
sdd->state &= ~TXBUSY;
else
dev_err(&sdd->pdev->dev, "DmaAbrtTx-%d \n", size);

/* If the other done */
if (!(sdd->state & RXBUSY))
complete(&sdd->xfer_completion);

spin_unlock_irqrestore(&sdd->lock, flags);
}

#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)

static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
Expand Down Expand Up @@ -696,12 +700,10 @@ static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
if (use_dma) {
if (xfer->tx_buf != NULL
&& (sdd->state & TXBUSY))
s3c2410_dma_ctrl(sdd->tx_dmach,
S3C2410_DMAOP_FLUSH);
sdd->ops->stop(sdd->tx_ch);
if (xfer->rx_buf != NULL
&& (sdd->state & RXBUSY))
s3c2410_dma_ctrl(sdd->rx_dmach,
S3C2410_DMAOP_FLUSH);
sdd->ops->stop(sdd->rx_ch);
}

goto out;
Expand Down Expand Up @@ -741,24 +743,19 @@ static void handle_msg(struct s3c64xx_spi_driver_data *sdd,

static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
{
if (s3c2410_dma_request(sdd->rx_dmach,
&s3c64xx_spi_dma_client, NULL) < 0) {
dev_err(&sdd->pdev->dev, "cannot get RxDMA\n");
return 0;
}
s3c2410_dma_set_buffdone_fn(sdd->rx_dmach, s3c64xx_spi_dma_rxcb);
s3c2410_dma_devconfig(sdd->rx_dmach, S3C2410_DMASRC_HW,
sdd->sfr_start + S3C64XX_SPI_RX_DATA);

if (s3c2410_dma_request(sdd->tx_dmach,
&s3c64xx_spi_dma_client, NULL) < 0) {
dev_err(&sdd->pdev->dev, "cannot get TxDMA\n");
s3c2410_dma_free(sdd->rx_dmach, &s3c64xx_spi_dma_client);
return 0;
}
s3c2410_dma_set_buffdone_fn(sdd->tx_dmach, s3c64xx_spi_dma_txcb);
s3c2410_dma_devconfig(sdd->tx_dmach, S3C2410_DMASRC_MEM,
sdd->sfr_start + S3C64XX_SPI_TX_DATA);

struct samsung_dma_info info;
sdd->ops = samsung_dma_get_ops();

info.cap = DMA_SLAVE;
info.client = &s3c64xx_spi_dma_client;
info.direction = DMA_FROM_DEVICE;
info.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
info.width = sdd->cur_bpw / 8;
sdd->rx_ch = sdd->ops->request(sdd->rx_dmach, &info);
info.direction = DMA_TO_DEVICE;
info.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
sdd->tx_ch = sdd->ops->request(sdd->tx_dmach, &info);

return 1;
}
Expand Down Expand Up @@ -799,8 +796,8 @@ static void s3c64xx_spi_work(struct work_struct *work)
spin_unlock_irqrestore(&sdd->lock, flags);

/* Free DMA channels */
s3c2410_dma_free(sdd->tx_dmach, &s3c64xx_spi_dma_client);
s3c2410_dma_free(sdd->rx_dmach, &s3c64xx_spi_dma_client);
sdd->ops->release(sdd->rx_ch, &s3c64xx_spi_dma_client);
sdd->ops->release(sdd->tx_ch, &s3c64xx_spi_dma_client);
}

static int s3c64xx_spi_transfer(struct spi_device *spi,
Expand Down

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