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authorBoojin Kim <boojin.kim@samsung.com>2011-09-02 09:44:41 +0900
committerVinod Koul <vinod.koul@intel.com>2011-09-14 11:10:03 +0530
commit39d3e8074e44c1953928a0b91bc328f552c5fc79 (patch)
treeb7cf213415d43309a71e4366d5a9a6da93d0d8ee /drivers
parent978ce50dd5cfd93380ded89d61de9d8109ebd814 (diff)
downloadop-kernel-dev-39d3e8074e44c1953928a0b91bc328f552c5fc79.zip
op-kernel-dev-39d3e8074e44c1953928a0b91bc328f552c5fc79.tar.gz
spi/s3c64xx: Add support DMA engine API
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/spi/spi-s3c64xx.c141
1 files changed, 69 insertions, 72 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 595dacc..24f4903 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -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 = {
@@ -226,6 +229,38 @@ 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)
@@ -233,6 +268,7 @@ static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
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);
@@ -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:
@@ -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);
}
}
@@ -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,
@@ -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;
@@ -741,24 +743,19 @@ out:
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;
}
@@ -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,
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