spi: tegra: remove support of legacy DMA driver based access

Remove the support code which uses the legacy APB DMA driver
for accessing the SPI FIFO.
The driver will use the dmaengine based APB DMA driver for
accessing reqding/writing to SPI FIFO.
Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

drivers/spi/Kconfig

@@ -366,7 +366,7 @@ config SPI_STMP3XXX
 
 config SPI_TEGRA
 	tristate "Nvidia Tegra SPI controller"
-	depends on ARCH_TEGRA && (TEGRA_SYSTEM_DMA || TEGRA20_APB_DMA)
+	depends on ARCH_TEGRA && TEGRA20_APB_DMA
 	help
 	  SPI driver for NVidia Tegra SoCs
 

drivers/spi/spi-tegra.c

@@ -164,23 +164,15 @@ struct spi_tegra_data {
 	 * 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)
 {
@@ -204,10 +196,6 @@ static void spi_tegra_go(struct spi_tegra_data *tspi)
 	val &= ~SLINK_DMA_BLOCK_SIZE(~0) & ~SLINK_DMA_EN;
 	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);
@@ -219,7 +207,6 @@ static void spi_tegra_go(struct spi_tegra_data *tspi)
 	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);
@@ -405,19 +392,12 @@ static void handle_spi_rx_dma_complete(struct spi_tegra_data *tspi)
 
 	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)
 {
@@ -509,9 +489,7 @@ 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) {
@@ -563,14 +541,6 @@ 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);
@@ -580,8 +550,6 @@ static int __devinit spi_tegra_probe(struct platform_device *pdev)
 		goto err3;
 	}
 
-#endif
-
 	tspi->rx_bb = dma_alloc_coherent(&pdev->dev, sizeof(u32) * BB_LEN,
 					 &tspi->rx_bb_phys, GFP_KERNEL);
 	if (!tspi->rx_bb) {
@@ -590,17 +558,6 @@ 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;
-	tspi->rx_dma_req.dest_bus_width = 32;
-	tspi->rx_dma_req.source_addr = tspi->phys + SLINK_RX_FIFO;
-	tspi->rx_dma_req.source_bus_width = 32;
-	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;
@@ -616,7 +573,6 @@ static int __devinit spi_tegra_probe(struct platform_device *pdev)
 			ret);
 		goto err4;
 	}
-#endif
 
 	master->dev.of_node = pdev->dev.of_node;
 	ret = spi_register_master(master);
@@ -630,11 +586,7 @@ static int __devinit spi_tegra_probe(struct platform_device *pdev)
 	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:
@@ -656,12 +608,7 @@ 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);