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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.c158
1 files changed, 105 insertions, 53 deletions
diff --git a/drivers/spi/spi_s3c64xx.c b/drivers/spi/spi_s3c64xx.c
index c3038da2648..795828b90f4 100644
--- a/drivers/spi/spi_s3c64xx.c
+++ b/drivers/spi/spi_s3c64xx.c
@@ -261,15 +261,25 @@ 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, 1);
+ 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);
} else {
- unsigned char *buf = (unsigned char *) xfer->tx_buf;
- int i = 0;
- while (i < xfer->len)
- writeb(buf[i++], regs + S3C64XX_SPI_TX_DATA);
+ switch (sdd->cur_bpw) {
+ case 32:
+ iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
+ xfer->tx_buf, xfer->len / 4);
+ break;
+ case 16:
+ iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
+ xfer->tx_buf, xfer->len / 2);
+ break;
+ default:
+ iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
+ xfer->tx_buf, xfer->len);
+ break;
+ }
}
}
@@ -286,7 +296,7 @@ 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);
- s3c2410_dma_config(sdd->rx_dmach, 1);
+ 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);
@@ -366,20 +376,26 @@ static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
return -EIO;
}
} else {
- unsigned char *buf;
- int i;
-
/* If it was only Tx */
if (xfer->rx_buf == NULL) {
sdd->state &= ~TXBUSY;
return 0;
}
- i = 0;
- buf = xfer->rx_buf;
- while (i < xfer->len)
- buf[i++] = readb(regs + S3C64XX_SPI_RX_DATA);
-
+ switch (sdd->cur_bpw) {
+ case 32:
+ ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
+ xfer->rx_buf, xfer->len / 4);
+ break;
+ case 16:
+ ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
+ xfer->rx_buf, xfer->len / 2);
+ break;
+ default:
+ ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
+ xfer->rx_buf, xfer->len);
+ break;
+ }
sdd->state &= ~RXBUSY;
}
@@ -399,13 +415,18 @@ static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
{
+ struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
void __iomem *regs = sdd->regs;
u32 val;
/* Disable Clock */
- val = readl(regs + S3C64XX_SPI_CLK_CFG);
- val &= ~S3C64XX_SPI_ENCLK_ENABLE;
- writel(val, regs + S3C64XX_SPI_CLK_CFG);
+ if (sci->clk_from_cmu) {
+ clk_disable(sdd->src_clk);
+ } else {
+ val = readl(regs + S3C64XX_SPI_CLK_CFG);
+ val &= ~S3C64XX_SPI_ENCLK_ENABLE;
+ writel(val, regs + S3C64XX_SPI_CLK_CFG);
+ }
/* Set Polarity and Phase */
val = readl(regs + S3C64XX_SPI_CH_CFG);
@@ -429,29 +450,39 @@ static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
switch (sdd->cur_bpw) {
case 32:
val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
+ val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
break;
case 16:
val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
+ val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
break;
default:
val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
+ val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
break;
}
- val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE; /* Always 8bits wide */
writel(val, regs + S3C64XX_SPI_MODE_CFG);
- /* Configure Clock */
- val = readl(regs + S3C64XX_SPI_CLK_CFG);
- val &= ~S3C64XX_SPI_PSR_MASK;
- val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
- & S3C64XX_SPI_PSR_MASK);
- writel(val, regs + S3C64XX_SPI_CLK_CFG);
-
- /* Enable Clock */
- val = readl(regs + S3C64XX_SPI_CLK_CFG);
- val |= S3C64XX_SPI_ENCLK_ENABLE;
- writel(val, regs + S3C64XX_SPI_CLK_CFG);
+ if (sci->clk_from_cmu) {
+ /* Configure Clock */
+ /* There is half-multiplier before the SPI */
+ clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
+ /* Enable Clock */
+ clk_enable(sdd->src_clk);
+ } else {
+ /* Configure Clock */
+ val = readl(regs + S3C64XX_SPI_CLK_CFG);
+ val &= ~S3C64XX_SPI_PSR_MASK;
+ val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
+ & S3C64XX_SPI_PSR_MASK);
+ writel(val, regs + S3C64XX_SPI_CLK_CFG);
+
+ /* Enable Clock */
+ val = readl(regs + S3C64XX_SPI_CLK_CFG);
+ val |= S3C64XX_SPI_ENCLK_ENABLE;
+ writel(val, regs + S3C64XX_SPI_CLK_CFG);
+ }
}
static void s3c64xx_spi_dma_rxcb(struct s3c2410_dma_chan *chan, void *buf_id,
@@ -499,6 +530,7 @@ static void s3c64xx_spi_dma_txcb(struct s3c2410_dma_chan *chan, void *buf_id,
static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
+ struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
struct device *dev = &sdd->pdev->dev;
struct spi_transfer *xfer;
@@ -514,6 +546,9 @@ static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
/* Map until end or first fail */
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+ if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
+ continue;
+
if (xfer->tx_buf != NULL) {
xfer->tx_dma = dma_map_single(dev,
(void *)xfer->tx_buf, xfer->len,
@@ -545,6 +580,7 @@ static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
+ struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
struct device *dev = &sdd->pdev->dev;
struct spi_transfer *xfer;
@@ -553,6 +589,9 @@ static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+ if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
+ continue;
+
if (xfer->rx_buf != NULL
&& xfer->rx_dma != XFER_DMAADDR_INVALID)
dma_unmap_single(dev, xfer->rx_dma,
@@ -608,6 +647,14 @@ static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
bpw = xfer->bits_per_word ? : spi->bits_per_word;
speed = xfer->speed_hz ? : spi->max_speed_hz;
+ if (xfer->len % (bpw / 8)) {
+ dev_err(&spi->dev,
+ "Xfer length(%u) not a multiple of word size(%u)\n",
+ xfer->len, bpw / 8);
+ status = -EIO;
+ goto out;
+ }
+
if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
sdd->cur_bpw = bpw;
sdd->cur_speed = speed;
@@ -798,7 +845,6 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
struct s3c64xx_spi_driver_data *sdd;
struct s3c64xx_spi_info *sci;
struct spi_message *msg;
- u32 psr, speed;
unsigned long flags;
int err = 0;
@@ -841,32 +887,37 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
/* Check if we can provide the requested rate */
- speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1); /* Max possible */
-
- if (spi->max_speed_hz > speed)
- spi->max_speed_hz = speed;
-
- psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
- psr &= S3C64XX_SPI_PSR_MASK;
- if (psr == S3C64XX_SPI_PSR_MASK)
- psr--;
+ if (!sci->clk_from_cmu) {
+ u32 psr, speed;
+
+ /* Max possible */
+ speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
+
+ if (spi->max_speed_hz > speed)
+ spi->max_speed_hz = speed;
+
+ psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
+ psr &= S3C64XX_SPI_PSR_MASK;
+ if (psr == S3C64XX_SPI_PSR_MASK)
+ psr--;
+
+ speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
+ if (spi->max_speed_hz < speed) {
+ if (psr+1 < S3C64XX_SPI_PSR_MASK) {
+ psr++;
+ } else {
+ err = -EINVAL;
+ goto setup_exit;
+ }
+ }
- speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
- if (spi->max_speed_hz < speed) {
- if (psr+1 < S3C64XX_SPI_PSR_MASK) {
- psr++;
- } else {
+ speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
+ if (spi->max_speed_hz >= speed)
+ spi->max_speed_hz = speed;
+ else
err = -EINVAL;
- goto setup_exit;
- }
}
- speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
- if (spi->max_speed_hz >= speed)
- spi->max_speed_hz = speed;
- else
- err = -EINVAL;
-
setup_exit:
/* setup() returns with device de-selected */
@@ -888,7 +939,8 @@ static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
/* Disable Interrupts - we use Polling if not DMA mode */
writel(0, regs + S3C64XX_SPI_INT_EN);
- writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
+ if (!sci->clk_from_cmu)
+ writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
regs + S3C64XX_SPI_CLK_CFG);
writel(0, regs + S3C64XX_SPI_MODE_CFG);
writel(0, regs + S3C64XX_SPI_PACKET_CNT);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 08:47:03 +0000