On Sat, Jul 16, 2011 at 03:44:24PM +0900, Kukjin Kim wrote: > From: Boojin Kim <[email protected]> > > 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 <[email protected]> > Cc: Grant Likely <[email protected]> > Signed-off-by: Kukjin Kim <[email protected]>
Acked-by: Grant Likely <[email protected]> > --- > drivers/spi/spi_s3c64xx.c | 141 > ++++++++++++++++++++++----------------------- > 1 files changed, 69 insertions(+), 72 deletions(-) > > diff --git a/drivers/spi/spi_s3c64xx.c b/drivers/spi/spi_s3c64xx.c > index 8945e20..a4cf76a 100644 > --- a/drivers/spi/spi_s3c64xx.c > +++ b/drivers/spi/spi_s3c64xx.c > @@ -172,6 +172,9 @@ 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 = { > @@ -227,6 +230,38 @@ 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) > @@ -234,6 +269,7 @@ 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); > @@ -259,10 +295,14 @@ 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: > @@ -294,10 +334,14 @@ 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); > } > } > > @@ -483,46 +527,6 @@ 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, > @@ -697,12 +701,10 @@ 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; > @@ -742,24 +744,19 @@ 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; > } > @@ -800,8 +797,8 @@ 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, > -- > 1.7.1 > > > _______________________________________________ > linux-arm-kernel mailing list > [email protected] > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
