diff options
| -rw-r--r-- | drivers/spi/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/spi/spi-tegra.c | 89 |
2 files changed, 85 insertions, 6 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 00c024039c97..6eeb8a286a20 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -357,7 +357,7 @@ config SPI_STMP3XXX config SPI_TEGRA tristate "Nvidia Tegra SPI controller" - depends on ARCH_TEGRA && TEGRA_SYSTEM_DMA + depends on ARCH_TEGRA && (TEGRA_SYSTEM_DMA || TEGRA20_APB_DMA) help SPI driver for NVidia Tegra SoCs diff --git a/drivers/spi/spi-tegra.c b/drivers/spi/spi-tegra.c index ae6d78a3e912..956ff4a0827b 100644 --- a/drivers/spi/spi-tegra.c +++ b/drivers/spi/spi-tegra.c @@ -30,6 +30,7 @@ #include <linux/delay.h> #include <linux/spi/spi.h> +#include <linux/dmaengine.h> #include <mach/dma.h> @@ -162,12 +163,23 @@ struct spi_tegra_data { * require transfers to be 4 byte aligned we need a bounce buffer * for the generic case. */ + int dma_req_len; +#if defined(CONFIG_TEGRA_SYSTEM_DMA) struct tegra_dma_req rx_dma_req; struct tegra_dma_channel *rx_dma; +#else + struct dma_chan *rx_dma; + struct dma_slave_config sconfig; + struct dma_async_tx_descriptor *rx_dma_desc; + dma_cookie_t rx_cookie; +#endif u32 *rx_bb; dma_addr_t rx_bb_phys; }; +#if !defined(CONFIG_TEGRA_SYSTEM_DMA) +static void tegra_spi_rx_dma_complete(void *args); +#endif static inline unsigned long spi_tegra_readl(struct spi_tegra_data *tspi, unsigned long reg) @@ -190,10 +202,24 @@ static void spi_tegra_go(struct spi_tegra_data *tspi) val = spi_tegra_readl(tspi, SLINK_DMA_CTL); val &= ~SLINK_DMA_BLOCK_SIZE(~0) & ~SLINK_DMA_EN; - val |= SLINK_DMA_BLOCK_SIZE(tspi->rx_dma_req.size / 4 - 1); + val |= SLINK_DMA_BLOCK_SIZE(tspi->dma_req_len / 4 - 1); spi_tegra_writel(tspi, val, SLINK_DMA_CTL); - +#if defined(CONFIG_TEGRA_SYSTEM_DMA) + tspi->rx_dma_req.size = tspi->dma_req_len; tegra_dma_enqueue_req(tspi->rx_dma, &tspi->rx_dma_req); +#else + tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma, + tspi->rx_bb_phys, tspi->dma_req_len, + DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); + if (!tspi->rx_dma_desc) { + dev_err(&tspi->pdev->dev, "dmaengine slave prep failed\n"); + return; + } + tspi->rx_dma_desc->callback = tegra_spi_rx_dma_complete; + tspi->rx_dma_desc->callback_param = tspi; + tspi->rx_cookie = dmaengine_submit(tspi->rx_dma_desc); + dma_async_issue_pending(tspi->rx_dma); +#endif val |= SLINK_DMA_EN; spi_tegra_writel(tspi, val, SLINK_DMA_CTL); @@ -221,7 +247,7 @@ static unsigned spi_tegra_fill_tx_fifo(struct spi_tegra_data *tspi, spi_tegra_writel(tspi, val, SLINK_TX_FIFO); } - tspi->rx_dma_req.size = len / tspi->cur_bytes_per_word * 4; + tspi->dma_req_len = len / tspi->cur_bytes_per_word * 4; return len; } @@ -318,9 +344,8 @@ static void spi_tegra_start_message(struct spi_device *spi, spi_tegra_start_transfer(spi, t); } -static void tegra_spi_rx_dma_complete(struct tegra_dma_req *req) +static void handle_spi_rx_dma_complete(struct spi_tegra_data *tspi) { - struct spi_tegra_data *tspi = req->dev; unsigned long flags; struct spi_message *m; struct spi_device *spi; @@ -380,6 +405,19 @@ static void tegra_spi_rx_dma_complete(struct tegra_dma_req *req) spin_unlock_irqrestore(&tspi->lock, flags); } +#if defined(CONFIG_TEGRA_SYSTEM_DMA) +static void tegra_spi_rx_dma_complete(struct tegra_dma_req *req) +{ + struct spi_tegra_data *tspi = req->dev; + handle_spi_rx_dma_complete(tspi); +} +#else +static void tegra_spi_rx_dma_complete(void *args) +{ + struct spi_tegra_data *tspi = args; + handle_spi_rx_dma_complete(tspi); +} +#endif static int spi_tegra_setup(struct spi_device *spi) { @@ -471,6 +509,9 @@ static int __devinit spi_tegra_probe(struct platform_device *pdev) struct spi_tegra_data *tspi; struct resource *r; int ret; +#if !defined(CONFIG_TEGRA_SYSTEM_DMA) + dma_cap_mask_t mask; +#endif master = spi_alloc_master(&pdev->dev, sizeof *tspi); if (master == NULL) { @@ -522,12 +563,24 @@ static int __devinit spi_tegra_probe(struct platform_device *pdev) INIT_LIST_HEAD(&tspi->queue); +#if defined(CONFIG_TEGRA_SYSTEM_DMA) tspi->rx_dma = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT); if (!tspi->rx_dma) { dev_err(&pdev->dev, "can not allocate rx dma channel\n"); ret = -ENODEV; goto err3; } +#else + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + tspi->rx_dma = dma_request_channel(mask, NULL, NULL); + if (!tspi->rx_dma) { + dev_err(&pdev->dev, "can not allocate rx dma channel\n"); + ret = -ENODEV; + goto err3; + } + +#endif tspi->rx_bb = dma_alloc_coherent(&pdev->dev, sizeof(u32) * BB_LEN, &tspi->rx_bb_phys, GFP_KERNEL); @@ -537,6 +590,7 @@ static int __devinit spi_tegra_probe(struct platform_device *pdev) goto err4; } +#if defined(CONFIG_TEGRA_SYSTEM_DMA) tspi->rx_dma_req.complete = tegra_spi_rx_dma_complete; tspi->rx_dma_req.to_memory = 1; tspi->rx_dma_req.dest_addr = tspi->rx_bb_phys; @@ -546,6 +600,23 @@ static int __devinit spi_tegra_probe(struct platform_device *pdev) tspi->rx_dma_req.source_wrap = 4; tspi->rx_dma_req.req_sel = spi_tegra_req_sels[pdev->id]; tspi->rx_dma_req.dev = tspi; +#else + /* Dmaengine Dma slave config */ + tspi->sconfig.src_addr = tspi->phys + SLINK_RX_FIFO; + tspi->sconfig.dst_addr = tspi->phys + SLINK_RX_FIFO; + tspi->sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + tspi->sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + tspi->sconfig.slave_id = spi_tegra_req_sels[pdev->id]; + tspi->sconfig.src_maxburst = 1; + tspi->sconfig.dst_maxburst = 1; + ret = dmaengine_device_control(tspi->rx_dma, + DMA_SLAVE_CONFIG, (unsigned long) &tspi->sconfig); + if (ret < 0) { + dev_err(&pdev->dev, "can not do slave configure for dma %d\n", + ret); + goto err4; + } +#endif master->dev.of_node = pdev->dev.of_node; ret = spi_register_master(master); @@ -559,7 +630,11 @@ err5: dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN, tspi->rx_bb, tspi->rx_bb_phys); err4: +#if defined(CONFIG_TEGRA_SYSTEM_DMA) tegra_dma_free_channel(tspi->rx_dma); +#else + dma_release_channel(tspi->rx_dma); +#endif err3: clk_put(tspi->clk); err2: @@ -581,7 +656,11 @@ static int __devexit spi_tegra_remove(struct platform_device *pdev) tspi = spi_master_get_devdata(master); spi_unregister_master(master); +#if defined(CONFIG_TEGRA_SYSTEM_DMA) tegra_dma_free_channel(tspi->rx_dma); +#else + dma_release_channel(tspi->rx_dma); +#endif dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN, tspi->rx_bb, tspi->rx_bb_phys); |