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path: root/drivers/spi/spi-s3c64xx.c
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Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
-rw-r--r--drivers/spi/spi-s3c64xx.c140
1 files changed, 76 insertions, 64 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 24f49032ec35..019a7163572f 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -131,6 +131,12 @@
#define RXBUSY (1<<2)
#define TXBUSY (1<<3)
+struct s3c64xx_spi_dma_data {
+ unsigned ch;
+ enum dma_data_direction direction;
+ enum dma_ch dmach;
+};
+
/**
* struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
* @clk: Pointer to the spi clock.
@@ -164,15 +170,13 @@ struct s3c64xx_spi_driver_data {
struct work_struct work;
struct list_head queue;
spinlock_t lock;
- enum dma_ch rx_dmach;
- enum dma_ch tx_dmach;
unsigned long sfr_start;
struct completion xfer_completion;
unsigned state;
unsigned cur_mode, cur_bpw;
unsigned cur_speed;
- unsigned rx_ch;
- unsigned tx_ch;
+ struct s3c64xx_spi_dma_data rx_dma;
+ struct s3c64xx_spi_dma_data tx_dma;
struct samsung_dma_ops *ops;
};
@@ -229,36 +233,76 @@ 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)
+static void s3c64xx_spi_dmacb(void *data)
{
- struct s3c64xx_spi_driver_data *sdd
- = (struct s3c64xx_spi_driver_data *)data;
+ struct s3c64xx_spi_driver_data *sdd;
+ struct s3c64xx_spi_dma_data *dma = data;
unsigned long flags;
+ if (dma->direction == DMA_FROM_DEVICE)
+ sdd = container_of(data,
+ struct s3c64xx_spi_driver_data, rx_dma);
+ else
+ sdd = container_of(data,
+ struct s3c64xx_spi_driver_data, tx_dma);
+
spin_lock_irqsave(&sdd->lock, flags);
- sdd->state &= ~RXBUSY;
- /* If the other done */
- if (!(sdd->state & TXBUSY))
- complete(&sdd->xfer_completion);
+ if (dma->direction == DMA_FROM_DEVICE) {
+ sdd->state &= ~RXBUSY;
+ if (!(sdd->state & TXBUSY))
+ complete(&sdd->xfer_completion);
+ } else {
+ sdd->state &= ~TXBUSY;
+ if (!(sdd->state & RXBUSY))
+ complete(&sdd->xfer_completion);
+ }
spin_unlock_irqrestore(&sdd->lock, flags);
}
-static void s3c64xx_spi_dma_txcb(void *data)
+static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
+ unsigned len, dma_addr_t buf)
{
- struct s3c64xx_spi_driver_data *sdd
- = (struct s3c64xx_spi_driver_data *)data;
- unsigned long flags;
+ struct s3c64xx_spi_driver_data *sdd;
+ struct samsung_dma_prep_info info;
- spin_lock_irqsave(&sdd->lock, flags);
+ if (dma->direction == DMA_FROM_DEVICE)
+ sdd = container_of((void *)dma,
+ struct s3c64xx_spi_driver_data, rx_dma);
+ else
+ sdd = container_of((void *)dma,
+ struct s3c64xx_spi_driver_data, tx_dma);
- sdd->state &= ~TXBUSY;
- /* If the other done */
- if (!(sdd->state & RXBUSY))
- complete(&sdd->xfer_completion);
+ info.cap = DMA_SLAVE;
+ info.len = len;
+ info.fp = s3c64xx_spi_dmacb;
+ info.fp_param = dma;
+ info.direction = dma->direction;
+ info.buf = buf;
+
+ sdd->ops->prepare(dma->ch, &info);
+ sdd->ops->trigger(dma->ch);
+}
- spin_unlock_irqrestore(&sdd->lock, flags);
+static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
+{
+ struct samsung_dma_info info;
+
+ sdd->ops = samsung_dma_get_ops();
+
+ info.cap = DMA_SLAVE;
+ info.client = &s3c64xx_spi_dma_client;
+ info.width = sdd->cur_bpw / 8;
+
+ info.direction = sdd->rx_dma.direction;
+ info.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
+ sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &info);
+ info.direction = sdd->tx_dma.direction;
+ info.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
+ sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &info);
+
+ return 1;
}
static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
@@ -268,7 +312,6 @@ 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);
@@ -294,14 +337,7 @@ 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;
- 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);
+ prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma);
} else {
switch (sdd->cur_bpw) {
case 32:
@@ -333,14 +369,7 @@ 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);
- 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);
+ prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma);
}
}
@@ -700,10 +729,10 @@ static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
if (use_dma) {
if (xfer->tx_buf != NULL
&& (sdd->state & TXBUSY))
- sdd->ops->stop(sdd->tx_ch);
+ sdd->ops->stop(sdd->tx_dma.ch);
if (xfer->rx_buf != NULL
&& (sdd->state & RXBUSY))
- sdd->ops->stop(sdd->rx_ch);
+ sdd->ops->stop(sdd->rx_dma.ch);
}
goto out;
@@ -741,25 +770,6 @@ out:
msg->complete(msg->context);
}
-static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
-{
-
- 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;
-}
-
static void s3c64xx_spi_work(struct work_struct *work)
{
struct s3c64xx_spi_driver_data *sdd = container_of(work,
@@ -796,8 +806,8 @@ static void s3c64xx_spi_work(struct work_struct *work)
spin_unlock_irqrestore(&sdd->lock, flags);
/* Free DMA channels */
- sdd->ops->release(sdd->rx_ch, &s3c64xx_spi_dma_client);
- sdd->ops->release(sdd->tx_ch, &s3c64xx_spi_dma_client);
+ sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
+ sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
}
static int s3c64xx_spi_transfer(struct spi_device *spi,
@@ -1014,8 +1024,10 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
sdd->cntrlr_info = sci;
sdd->pdev = pdev;
sdd->sfr_start = mem_res->start;
- sdd->tx_dmach = dmatx_res->start;
- sdd->rx_dmach = dmarx_res->start;
+ sdd->tx_dma.dmach = dmatx_res->start;
+ sdd->tx_dma.direction = DMA_TO_DEVICE;
+ sdd->rx_dma.dmach = dmarx_res->start;
+ sdd->rx_dma.direction = DMA_FROM_DEVICE;
sdd->cur_bpw = 8;
@@ -1103,7 +1115,7 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
pdev->id, master->num_chipselect);
dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n",
mem_res->end, mem_res->start,
- sdd->rx_dmach, sdd->tx_dmach);
+ sdd->rx_dma.dmach, sdd->tx_dma.dmach);
return 0;
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-06 09:29:58 +0000