ux500: Add DMA support for U5500

Add basic DMA configuration for u5500 supporting memcpy.
Make way for SDI0 dma support by setting SDI0 to -1,
indicating it will be configured in runtime.

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>

1 files changed, 120 insertions, 0 deletions

diff --git a/arch/arm/mach-ux500/dma-db5500.c b/arch/arm/mach-ux500/dma-db5500.c
new file mode 100644
index 000000000000..32a061f8a95b
--- /dev/null
+++ b/arch/arm/mach-ux500/dma-db5500.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
+ * Author: Rabin Vincent <rabinv.vincent@stericsson.com> for ST-Ericsson
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+
+#include <plat/ste_dma40.h>
+#include <mach/setup.h>
+#include <mach/hardware.h>
+
+#include "ste-dma40-db5500.h"
+
+static struct resource dma40_resources[] = {
+	[0] = {
+		.start = U5500_DMA_BASE,
+		.end   = U5500_DMA_BASE + SZ_4K - 1,
+		.flags = IORESOURCE_MEM,
+		.name  = "base",
+	},
+	[1] = {
+		.start = U5500_DMA_LCPA_BASE,
+		.end   = U5500_DMA_LCPA_BASE + 2 * SZ_1K - 1,
+		.flags = IORESOURCE_MEM,
+		.name  = "lcpa",
+	},
+	[2] = {
+		.start = IRQ_DB5500_DMA,
+		.end   = IRQ_DB5500_DMA,
+		.flags = IORESOURCE_IRQ
+	}
+};
+
+/* Default configuration for physical memcpy */
+static struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
+	.mode = STEDMA40_MODE_PHYSICAL,
+	.dir = STEDMA40_MEM_TO_MEM,
+
+	.src_info.data_width = STEDMA40_BYTE_WIDTH,
+	.src_info.psize = STEDMA40_PSIZE_PHY_1,
+	.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+
+	.dst_info.data_width = STEDMA40_BYTE_WIDTH,
+	.dst_info.psize = STEDMA40_PSIZE_PHY_1,
+	.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+};
+
+/* Default configuration for logical memcpy */
+static struct stedma40_chan_cfg dma40_memcpy_conf_log = {
+	.dir = STEDMA40_MEM_TO_MEM,
+
+	.src_info.data_width = STEDMA40_BYTE_WIDTH,
+	.src_info.psize = STEDMA40_PSIZE_LOG_1,
+	.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+
+	.dst_info.data_width = STEDMA40_BYTE_WIDTH,
+	.dst_info.psize = STEDMA40_PSIZE_LOG_1,
+	.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
+};
+
+/*
+ * Mapping between soruce event lines and physical device address This was
+ * created assuming that the event line is tied to a device and therefore the
+ * address is constant, however this is not true for at least USB, and the
+ * values are just placeholders for USB.  This table is preserved and used for
+ * now.
+ */
+static const dma_addr_t dma40_rx_map[DB5500_DMA_NR_DEV] = {
+	[DB5500_DMA_DEV24_SDMMC0_RX] = -1,
+};
+
+/* Mapping between destination event lines and physical device address */
+static const dma_addr_t dma40_tx_map[DB5500_DMA_NR_DEV] = {
+	[DB5500_DMA_DEV24_SDMMC0_TX] = -1,
+};
+
+static int dma40_memcpy_event[] = {
+	DB5500_DMA_MEMCPY_TX_1,
+	DB5500_DMA_MEMCPY_TX_2,
+	DB5500_DMA_MEMCPY_TX_3,
+	DB5500_DMA_MEMCPY_TX_4,
+	DB5500_DMA_MEMCPY_TX_5,
+};
+
+static struct stedma40_platform_data dma40_plat_data = {
+	.dev_len		= ARRAY_SIZE(dma40_rx_map),
+	.dev_rx			= dma40_rx_map,
+	.dev_tx			= dma40_tx_map,
+	.memcpy			= dma40_memcpy_event,
+	.memcpy_len		= ARRAY_SIZE(dma40_memcpy_event),
+	.memcpy_conf_phy	= &dma40_memcpy_conf_phy,
+	.memcpy_conf_log	= &dma40_memcpy_conf_log,
+	.disabled_channels	= {-1},
+};
+
+static struct platform_device dma40_device = {
+	.dev = {
+		.platform_data = &dma40_plat_data,
+	},
+	.name		= "dma40",
+	.id		= 0,
+	.num_resources	= ARRAY_SIZE(dma40_resources),
+	.resource	= dma40_resources
+};
+
+void __init db5500_dma_init(void)
+{
+	int ret;
+
+	ret = platform_device_register(&dma40_device);
+	if (ret)
+		dev_err(&dma40_device.dev, "unable to register device: %d\n", ret);
+
+}