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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.c168
1 files changed, 75 insertions, 93 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 1dbdcc7b9ea7..9e2020df9e0f 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -849,16 +849,12 @@ static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
}
}
-static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
- struct spi_message *msg)
+static int s3c64xx_spi_prepare_message(struct spi_master *master,
+ struct spi_message *msg)
{
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
struct spi_device *spi = msg->spi;
struct s3c64xx_spi_csinfo *cs = spi->controller_data;
- struct spi_transfer *xfer;
- int status = 0, cs_toggle = 0;
- u32 speed;
- u8 bpw;
/* If Master's(controller) state differs from that needed by Slave */
if (sdd->cur_speed != spi->max_speed_hz
@@ -874,116 +870,98 @@ static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
if (s3c64xx_spi_map_mssg(sdd, msg)) {
dev_err(&spi->dev,
"Xfer: Unable to map message buffers!\n");
- status = -ENOMEM;
- goto out;
+ return -ENOMEM;
}
/* Configure feedback delay */
writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
- list_for_each_entry(xfer, &msg->transfers, transfer_list) {
-
- unsigned long flags;
- int use_dma;
-
- INIT_COMPLETION(sdd->xfer_completion);
-
- /* Only BPW and Speed may change across transfers */
- bpw = xfer->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;
- s3c64xx_spi_config(sdd);
- }
-
- /* Slave Select */
- enable_cs(sdd, spi);
+ return 0;
+}
- /* Polling method for xfers not bigger than FIFO capacity */
- use_dma = 0;
- if (!is_polling(sdd) &&
- (sdd->rx_dma.ch && sdd->tx_dma.ch &&
- (xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1))))
- use_dma = 1;
+static int s3c64xx_spi_transfer_one(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
+ int status;
+ u32 speed;
+ u8 bpw;
+ unsigned long flags;
+ int use_dma;
- spin_lock_irqsave(&sdd->lock, flags);
+ INIT_COMPLETION(sdd->xfer_completion);
- /* Pending only which is to be done */
- sdd->state &= ~RXBUSY;
- sdd->state &= ~TXBUSY;
+ /* Only BPW and Speed may change across transfers */
+ bpw = xfer->bits_per_word;
+ speed = xfer->speed_hz ? : spi->max_speed_hz;
- enable_datapath(sdd, spi, xfer, use_dma);
-
- /* Start the signals */
- writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
+ if (xfer->len % (bpw / 8)) {
+ dev_err(&spi->dev,
+ "Xfer length(%u) not a multiple of word size(%u)\n",
+ xfer->len, bpw / 8);
+ return -EIO;
+ }
- /* Start the signals */
- writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
+ if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
+ sdd->cur_bpw = bpw;
+ sdd->cur_speed = speed;
+ s3c64xx_spi_config(sdd);
+ }
- spin_unlock_irqrestore(&sdd->lock, flags);
+ /* Polling method for xfers not bigger than FIFO capacity */
+ use_dma = 0;
+ if (!is_polling(sdd) &&
+ (sdd->rx_dma.ch && sdd->tx_dma.ch &&
+ (xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1))))
+ use_dma = 1;
- status = wait_for_xfer(sdd, xfer, use_dma);
+ spin_lock_irqsave(&sdd->lock, flags);
- if (status) {
- dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
- xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
- (sdd->state & RXBUSY) ? 'f' : 'p',
- (sdd->state & TXBUSY) ? 'f' : 'p',
- xfer->len);
+ /* Pending only which is to be done */
+ sdd->state &= ~RXBUSY;
+ sdd->state &= ~TXBUSY;
- if (use_dma) {
- if (xfer->tx_buf != NULL
- && (sdd->state & TXBUSY))
- s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma);
- if (xfer->rx_buf != NULL
- && (sdd->state & RXBUSY))
- s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma);
- }
+ enable_datapath(sdd, spi, xfer, use_dma);
- goto out;
- }
+ /* Start the signals */
+ writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
- flush_fifo(sdd);
+ /* Start the signals */
+ writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
- if (xfer->delay_usecs)
- udelay(xfer->delay_usecs);
+ spin_unlock_irqrestore(&sdd->lock, flags);
- if (xfer->cs_change) {
- /* Hint that the next mssg is gonna be
- for the same device */
- if (list_is_last(&xfer->transfer_list,
- &msg->transfers))
- cs_toggle = 1;
+ status = wait_for_xfer(sdd, xfer, use_dma);
+
+ if (status) {
+ dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
+ xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
+ (sdd->state & RXBUSY) ? 'f' : 'p',
+ (sdd->state & TXBUSY) ? 'f' : 'p',
+ xfer->len);
+
+ if (use_dma) {
+ if (xfer->tx_buf != NULL
+ && (sdd->state & TXBUSY))
+ s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma);
+ if (xfer->rx_buf != NULL
+ && (sdd->state & RXBUSY))
+ s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma);
}
-
- msg->actual_length += xfer->len;
- }
-
-out:
- if (!cs_toggle || status) {
- /* Quiese the signals */
- writel(S3C64XX_SPI_SLAVE_SIG_INACT,
- sdd->regs + S3C64XX_SPI_SLAVE_SEL);
- disable_cs(sdd, spi);
} else {
- sdd->tgl_spi = spi;
+ flush_fifo(sdd);
}
- s3c64xx_spi_unmap_mssg(sdd, msg);
+ return status;
+}
- msg->status = status;
+static int s3c64xx_spi_unprepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
- spi_finalize_current_message(master);
+ s3c64xx_spi_unmap_mssg(sdd, msg);
return 0;
}
@@ -1121,6 +1099,7 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
return 0;
setup_exit:
+ pm_runtime_put(&sdd->pdev->dev);
/* setup() returns with device de-selected */
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
disable_cs(sdd, spi);
@@ -1360,7 +1339,9 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
master->setup = s3c64xx_spi_setup;
master->cleanup = s3c64xx_spi_cleanup;
master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
- master->transfer_one_message = s3c64xx_spi_transfer_one_message;
+ master->prepare_message = s3c64xx_spi_prepare_message;
+ master->transfer_one = s3c64xx_spi_transfer_one;
+ master->unprepare_message = s3c64xx_spi_unprepare_message;
master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
master->num_chipselect = sci->num_cs;
master->dma_alignment = 8;
@@ -1429,6 +1410,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
sdd->regs + S3C64XX_SPI_INT_EN);
+ pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = devm_spi_register_master(&pdev->dev, master);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-23 04:24:55 +0300