Merge branch 'drm-nouveau-fixes' of git://anongit.freedesktop.org/git/nouveau/linux...

[karo-tx-linux.git] / drivers / spi / spi-tegra.c

diff --git a/drivers/spi/spi-tegra.c b/drivers/spi/spi-tegra.c
index 7f99ff3553a65fa1565aae949fd019d10762a452..ef52c1c6f5c5e6c78759149986ff0bf2af6b6c06 100644 (file)
--- 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);