diff options
author | Mark Brown <broonie@linaro.org> | 2013-09-01 12:49:09 (GMT) |
---|---|---|
committer | Mark Brown <broonie@linaro.org> | 2013-09-01 12:49:09 (GMT) |
commit | 2dc745b6ef6d72cec863e93554df9108061c6ffd (patch) | |
tree | 95a75d61584dea85bdb867ee35d2317eccaa23e1 /drivers/spi | |
parent | 121a39661b8424d4207c94d46b84c924724c47bd (diff) | |
parent | c12f964357fc6de54252a4134720083d687caa22 (diff) | |
download | linux-2dc745b6ef6d72cec863e93554df9108061c6ffd.tar.xz |
Merge remote-tracking branch 'spi/topic/s3c64xx' into spi-next
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | drivers/spi/spi-s3c64xx.c | 112 |
1 files changed, 43 insertions, 69 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index c5bc961..512b8893 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -172,7 +172,6 @@ struct s3c64xx_spi_port_config { * @master: Pointer to the SPI Protocol master. * @cntrlr_info: Platform specific data for the controller this driver manages. * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint. - * @queue: To log SPI xfer requests. * @lock: Controller specific lock. * @state: Set of FLAGS to indicate status. * @rx_dmach: Controller's DMA channel for Rx. @@ -193,7 +192,6 @@ struct s3c64xx_spi_driver_data { struct spi_master *master; struct s3c64xx_spi_info *cntrlr_info; struct spi_device *tgl_spi; - struct list_head queue; spinlock_t lock; unsigned long sfr_start; struct completion xfer_completion; @@ -338,8 +336,10 @@ static int acquire_dma(struct s3c64xx_spi_driver_data *sdd) req.cap = DMA_SLAVE; req.client = &s3c64xx_spi_dma_client; - sdd->rx_dma.ch = (void *)sdd->ops->request(sdd->rx_dma.dmach, &req, dev, "rx"); - sdd->tx_dma.ch = (void *)sdd->ops->request(sdd->tx_dma.dmach, &req, dev, "tx"); + 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; } @@ -386,9 +386,10 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma, { struct s3c64xx_spi_driver_data *sdd; struct dma_slave_config config; - struct scatterlist sg; struct dma_async_tx_descriptor *desc; + memset(&config, 0, sizeof(config)); + if (dma->direction == DMA_DEV_TO_MEM) { sdd = container_of((void *)dma, struct s3c64xx_spi_driver_data, rx_dma); @@ -407,14 +408,8 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma, dmaengine_slave_config(dma->ch, &config); } - sg_init_table(&sg, 1); - sg_dma_len(&sg) = len; - sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf)), - len, offset_in_page(buf)); - sg_dma_address(&sg) = buf; - - desc = dmaengine_prep_slave_sg(dma->ch, - &sg, 1, dma->direction, DMA_PREP_INTERRUPT); + desc = dmaengine_prep_slave_single(dma->ch, buf, len, + dma->direction, DMA_PREP_INTERRUPT); desc->callback = s3c64xx_spi_dmacb; desc->callback_param = dma; @@ -431,27 +426,26 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi) dma_cap_mask_t mask; int ret; - if (is_polling(sdd)) - return 0; - - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - - /* Acquire DMA channels */ - sdd->rx_dma.ch = dma_request_slave_channel_compat(mask, filter, - (void*)sdd->rx_dma.dmach, dev, "rx"); - if (!sdd->rx_dma.ch) { - dev_err(dev, "Failed to get RX DMA channel\n"); - ret = -EBUSY; - goto out; - } + if (!is_polling(sdd)) { + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + /* Acquire DMA channels */ + sdd->rx_dma.ch = dma_request_slave_channel_compat(mask, filter, + (void *)sdd->rx_dma.dmach, dev, "rx"); + if (!sdd->rx_dma.ch) { + dev_err(dev, "Failed to get RX DMA channel\n"); + ret = -EBUSY; + goto out; + } - sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter, - (void*)sdd->tx_dma.dmach, dev, "tx"); - if (!sdd->tx_dma.ch) { - dev_err(dev, "Failed to get TX DMA channel\n"); - ret = -EBUSY; - goto out_rx; + sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter, + (void *)sdd->tx_dma.dmach, dev, "tx"); + if (!sdd->tx_dma.ch) { + dev_err(dev, "Failed to get TX DMA channel\n"); + ret = -EBUSY; + goto out_rx; + } } ret = pm_runtime_get_sync(&sdd->pdev->dev); @@ -1053,8 +1047,6 @@ static int s3c64xx_spi_setup(struct spi_device *spi) struct s3c64xx_spi_csinfo *cs = spi->controller_data; struct s3c64xx_spi_driver_data *sdd; struct s3c64xx_spi_info *sci; - struct spi_message *msg; - unsigned long flags; int err; sdd = spi_master_get_devdata(spi->master); @@ -1068,37 +1060,23 @@ static int s3c64xx_spi_setup(struct spi_device *spi) return -ENODEV; } - /* Request gpio only if cs line is asserted by gpio pins */ - if (sdd->cs_gpio) { - err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, - dev_name(&spi->dev)); - if (err) { - dev_err(&spi->dev, - "Failed to get /CS gpio [%d]: %d\n", - cs->line, err); - goto err_gpio_req; + if (!spi_get_ctldata(spi)) { + /* Request gpio only if cs line is asserted by gpio pins */ + if (sdd->cs_gpio) { + err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, + dev_name(&spi->dev)); + if (err) { + dev_err(&spi->dev, + "Failed to get /CS gpio [%d]: %d\n", + cs->line, err); + goto err_gpio_req; + } } - } - if (!spi_get_ctldata(spi)) spi_set_ctldata(spi, cs); - - sci = sdd->cntrlr_info; - - spin_lock_irqsave(&sdd->lock, flags); - - list_for_each_entry(msg, &sdd->queue, queue) { - /* Is some mssg is already queued for this device */ - if (msg->spi == spi) { - dev_err(&spi->dev, - "setup: attempt while mssg in queue!\n"); - spin_unlock_irqrestore(&sdd->lock, flags); - err = -EBUSY; - goto err_msgq; - } } - spin_unlock_irqrestore(&sdd->lock, flags); + sci = sdd->cntrlr_info; pm_runtime_get_sync(&sdd->pdev->dev); @@ -1146,7 +1124,6 @@ setup_exit: /* setup() returns with device de-selected */ disable_cs(sdd, spi); -err_msgq: gpio_free(cs->line); spi_set_ctldata(spi, NULL); @@ -1361,16 +1338,14 @@ static int s3c64xx_spi_probe(struct platform_device *pdev) if (!sdd->pdev->dev.of_node) { res = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!res) { - dev_warn(&pdev->dev, "Unable to get SPI tx dma " - "resource. Switching to poll mode\n"); + dev_warn(&pdev->dev, "Unable to get SPI tx dma resource. Switching to poll mode\n"); sdd->port_conf->quirks = S3C64XX_SPI_QUIRK_POLL; } else sdd->tx_dma.dmach = res->start; res = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!res) { - dev_warn(&pdev->dev, "Unable to get SPI rx dma " - "resource. Switching to poll mode\n"); + dev_warn(&pdev->dev, "Unable to get SPI rx dma resource. Switching to poll mode\n"); sdd->port_conf->quirks = S3C64XX_SPI_QUIRK_POLL; } else sdd->rx_dma.dmach = res->start; @@ -1440,7 +1415,6 @@ static int s3c64xx_spi_probe(struct platform_device *pdev) spin_lock_init(&sdd->lock); init_completion(&sdd->xfer_completion); - INIT_LIST_HEAD(&sdd->queue); ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0, "spi-s3c64xx", sdd); @@ -1462,8 +1436,8 @@ static int s3c64xx_spi_probe(struct platform_device *pdev) dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n", sdd->port_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, + dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tDMA=[Rx-%d, Tx-%d]\n", + mem_res, sdd->rx_dma.dmach, sdd->tx_dma.dmach); pm_runtime_enable(&pdev->dev); |