From: Mark Brown broonie@linaro.org
All the platforms which use the old S3C_DMA API have now been converted to dmaengine so we can remove the legacy code from the driver, simplifying maintenance.
Signed-off-by: Mark Brown broonie@linaro.org --- drivers/spi/spi-s3c64xx.c | 191 ---------------------------------------------- 1 file changed, 191 deletions(-)
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 4490e8c499c0..18ec7e65a319 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -34,10 +34,6 @@
#include <linux/platform_data/spi-s3c64xx.h>
-#ifdef CONFIG_S3C_DMA -#include <mach/dma.h> -#endif - #define MAX_SPI_PORTS 3 #define S3C64XX_SPI_QUIRK_POLL (1 << 0)
@@ -200,9 +196,6 @@ struct s3c64xx_spi_driver_data { unsigned cur_speed; struct s3c64xx_spi_dma_data rx_dma; struct s3c64xx_spi_dma_data tx_dma; -#ifdef CONFIG_S3C_DMA - struct samsung_dma_ops *ops; -#endif struct s3c64xx_spi_port_config *port_conf; unsigned int port_id; bool cs_gpio; @@ -284,180 +277,6 @@ static void s3c64xx_spi_dmacb(void *data) spin_unlock_irqrestore(&sdd->lock, flags); }
-#ifdef CONFIG_S3C_DMA -/* FIXME: remove this section once arch/arm/mach-s3c64xx uses dmaengine */ - -static struct s3c2410_dma_client s3c64xx_spi_dma_client = { - .name = "samsung-spi-dma", -}; - -static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd, - struct spi_message *msg) -{ - struct device *dev = &sdd->pdev->dev; - struct spi_transfer *xfer; - - if (is_polling(sdd) || msg->is_dma_mapped) - return 0; - - /* First mark all xfer unmapped */ - list_for_each_entry(xfer, &msg->transfers, transfer_list) { - xfer->rx_dma = XFER_DMAADDR_INVALID; - xfer->tx_dma = XFER_DMAADDR_INVALID; - } - - /* Map until end or first fail */ - list_for_each_entry(xfer, &msg->transfers, transfer_list) { - - if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) - continue; - - if (xfer->tx_buf != NULL) { - xfer->tx_dma = dma_map_single(dev, - (void *)xfer->tx_buf, xfer->len, - DMA_TO_DEVICE); - if (dma_mapping_error(dev, xfer->tx_dma)) { - dev_err(dev, "dma_map_single Tx failed\n"); - xfer->tx_dma = XFER_DMAADDR_INVALID; - return -ENOMEM; - } - } - - if (xfer->rx_buf != NULL) { - xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, - xfer->len, DMA_FROM_DEVICE); - if (dma_mapping_error(dev, xfer->rx_dma)) { - dev_err(dev, "dma_map_single Rx failed\n"); - dma_unmap_single(dev, xfer->tx_dma, - xfer->len, DMA_TO_DEVICE); - xfer->tx_dma = XFER_DMAADDR_INVALID; - xfer->rx_dma = XFER_DMAADDR_INVALID; - return -ENOMEM; - } - } - } - - return 0; -} - -static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd, - struct spi_message *msg) -{ - struct device *dev = &sdd->pdev->dev; - struct spi_transfer *xfer; - - if (is_polling(sdd) || msg->is_dma_mapped) - return; - - list_for_each_entry(xfer, &msg->transfers, transfer_list) { - - if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) - continue; - - if (xfer->rx_buf != NULL - && xfer->rx_dma != XFER_DMAADDR_INVALID) - dma_unmap_single(dev, xfer->rx_dma, - xfer->len, DMA_FROM_DEVICE); - - if (xfer->tx_buf != NULL - && xfer->tx_dma != XFER_DMAADDR_INVALID) - dma_unmap_single(dev, xfer->tx_dma, - xfer->len, DMA_TO_DEVICE); - } -} - -static void prepare_dma(struct s3c64xx_spi_dma_data *dma, - unsigned len, dma_addr_t buf) -{ - struct s3c64xx_spi_driver_data *sdd; - struct samsung_dma_prep info; - struct samsung_dma_config config; - - if (dma->direction == DMA_DEV_TO_MEM) { - sdd = container_of((void *)dma, - struct s3c64xx_spi_driver_data, rx_dma); - config.direction = sdd->rx_dma.direction; - config.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA; - config.width = sdd->cur_bpw / 8; - sdd->ops->config((enum dma_ch)sdd->rx_dma.ch, &config); - } else { - sdd = container_of((void *)dma, - struct s3c64xx_spi_driver_data, tx_dma); - config.direction = sdd->tx_dma.direction; - config.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA; - config.width = sdd->cur_bpw / 8; - sdd->ops->config((enum dma_ch)sdd->tx_dma.ch, &config); - } - - 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((enum dma_ch)dma->ch, &info); - sdd->ops->trigger((enum dma_ch)dma->ch); -} - -static int acquire_dma(struct s3c64xx_spi_driver_data *sdd) -{ - struct samsung_dma_req req; - struct device *dev = &sdd->pdev->dev; - - sdd->ops = samsung_dma_get_ops(); - - req.cap = DMA_SLAVE; - req.client = &s3c64xx_spi_dma_client; - - sdd->rx_dma.ch = (struct dma_chan *)(unsigned long)sdd->ops->request( - sdd->rx_dma.dmach, &req, dev, "rx"); - sdd->tx_dma.ch = (struct dma_chan *)(unsigned long)sdd->ops->request( - sdd->tx_dma.dmach, &req, dev, "tx"); - - return 1; -} - -static int s3c64xx_spi_prepare_transfer(struct spi_master *spi) -{ - struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); - - /* - * If DMA resource was not available during - * probe, no need to continue with dma requests - * else Acquire DMA channels - */ - while (!is_polling(sdd) && !acquire_dma(sdd)) - usleep_range(10000, 11000); - - return 0; -} - -static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi) -{ - struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); - - /* Free DMA channels */ - if (!is_polling(sdd)) { - sdd->ops->release((enum dma_ch)sdd->rx_dma.ch, - &s3c64xx_spi_dma_client); - sdd->ops->release((enum dma_ch)sdd->tx_dma.ch, - &s3c64xx_spi_dma_client); - } - - return 0; -} - -static void s3c64xx_spi_dma_stop(struct s3c64xx_spi_driver_data *sdd, - struct s3c64xx_spi_dma_data *dma) -{ - sdd->ops->stop((enum dma_ch)dma->ch); -} - -#define s3c64xx_spi_can_dma NULL - -#else - static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd, struct spi_message *msg) { @@ -583,8 +402,6 @@ static bool s3c64xx_spi_can_dma(struct spi_master *master, return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1; }
-#endif - static void enable_datapath(struct s3c64xx_spi_driver_data *sdd, struct spi_device *spi, struct spi_transfer *xfer, int dma_mode) @@ -616,11 +433,7 @@ 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; -#ifndef CONFIG_S3C_DMA prepare_dma(&sdd->tx_dma, &xfer->tx_sg); -#else - prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma); -#endif } else { switch (sdd->cur_bpw) { case 32: @@ -652,11 +465,7 @@ 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); -#ifndef CONFIG_S3C_DMA prepare_dma(&sdd->rx_dma, &xfer->rx_sg); -#else - prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma); -#endif } }