ARM: add DMA support to sh7372, enable DMA for SDHI

This adds DMA support for the sh7372 sh-mobile ARM core, using the shdma
dmaengine driver, and uses DMA for the SDHI SD-card controller on this SoC.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 242 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/board-ap4evb.c b/arch/arm/mach-shmobile/board-ap4evb.c
index 353ff8d120b1..5c41b958e022 100644
--- a/arch/arm/mach-shmobile/board-ap4evb.c
+++ b/arch/arm/mach-shmobile/board-ap4evb.c
@@ -24,6 +24,7 @@
 #include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
+#include <linux/mfd/sh_mobile_sdhi.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/physmap.h>
@@ -231,6 +232,11 @@ static struct platform_device keysc_device = {
 };
 
 /* SDHI0 */
+static struct sh_mobile_sdhi_info sdhi0_info = {
+        .dma_slave_tx = SHDMA_SLAVE_SDHI0_TX,
+        .dma_slave_rx = SHDMA_SLAVE_SDHI0_RX,
+};
+
 static struct resource sdhi0_resources[] = {
         [0] = {
                 .name   = "SDHI0",
@@ -249,6 +255,9 @@ static struct platform_device sdhi0_device = {
         .num_resources  = ARRAY_SIZE(sdhi0_resources),
         .resource       = sdhi0_resources,
         .id             = 0,
+        .dev    = {
+                .platform_data  = &sdhi0_info,
+        },
 };
 
 /* USB1 */
diff --git a/arch/arm/mach-shmobile/include/mach/sh7372.h b/arch/arm/mach-shmobile/include/mach/sh7372.h
index dc34f00c56b8..57e033a1e529 100644
--- a/arch/arm/mach-shmobile/include/mach/sh7372.h
+++ b/arch/arm/mach-shmobile/include/mach/sh7372.h
@@ -431,4 +431,14 @@ enum {
         GPIO_FN_SDENC_DV_CLKI,
 };
 
+/* DMA slave IDs */
+enum {
+        SHDMA_SLAVE_SDHI0_RX,
+        SHDMA_SLAVE_SDHI0_TX,
+        SHDMA_SLAVE_SDHI1_RX,
+        SHDMA_SLAVE_SDHI1_TX,
+        SHDMA_SLAVE_SDHI2_RX,
+        SHDMA_SLAVE_SDHI2_TX,
+};
+
 #endif /* __ASM_SH7372_H__ */
diff --git a/arch/arm/mach-shmobile/setup-sh7372.c b/arch/arm/mach-shmobile/setup-sh7372.c
index d1a8095a19eb..bf6974b4afd0 100644
--- a/arch/arm/mach-shmobile/setup-sh7372.c
+++ b/arch/arm/mach-shmobile/setup-sh7372.c
@@ -26,9 +26,11 @@
 #include <linux/input.h>
 #include <linux/io.h>
 #include <linux/serial_sci.h>
+#include <linux/sh_dma.h>
 #include <linux/sh_intc.h>
 #include <linux/sh_timer.h>
 #include <mach/hardware.h>
+#include <mach/sh7372.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 
@@ -227,6 +229,224 @@ static struct platform_device iic1_device = {
         .resource       = iic1_resources,
 };
 
+/* DMA */
+/* Transmit sizes and respective CHCR register values */
+enum {
+        XMIT_SZ_8BIT            = 0,
+        XMIT_SZ_16BIT           = 1,
+        XMIT_SZ_32BIT           = 2,
+        XMIT_SZ_64BIT           = 7,
+        XMIT_SZ_128BIT          = 3,
+        XMIT_SZ_256BIT          = 4,
+        XMIT_SZ_512BIT          = 5,
+};
+
+/* log2(size / 8) - used to calculate number of transfers */
+#define TS_SHIFT {                      \
+        [XMIT_SZ_8BIT]          = 0,    \
+        [XMIT_SZ_16BIT]         = 1,    \
+        [XMIT_SZ_32BIT]         = 2,    \
+        [XMIT_SZ_64BIT]         = 3,    \
+        [XMIT_SZ_128BIT]        = 4,    \
+        [XMIT_SZ_256BIT]        = 5,    \
+        [XMIT_SZ_512BIT]        = 6,    \
+}
+
+#define TS_INDEX2VAL(i) ((((i) & 3) << 3) | \
+                         (((i) & 0xc) << (20 - 2)))
+
+static const struct sh_dmae_slave_config sh7372_dmae_slaves[] = {
+        {
+                .slave_id       = SHDMA_SLAVE_SDHI0_TX,
+                .addr           = 0xe6850030,
+                .chcr           = DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+                .mid_rid        = 0xc1,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI0_RX,
+                .addr           = 0xe6850030,
+                .chcr           = DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+                .mid_rid        = 0xc2,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI1_TX,
+                .addr           = 0xe6860030,
+                .chcr           = DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+                .mid_rid        = 0xc9,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI1_RX,
+                .addr           = 0xe6860030,
+                .chcr           = DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+                .mid_rid        = 0xca,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI2_TX,
+                .addr           = 0xe6870030,
+                .chcr           = DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+                .mid_rid        = 0xcd,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI2_RX,
+                .addr           = 0xe6870030,
+                .chcr           = DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL(XMIT_SZ_16BIT),
+                .mid_rid        = 0xce,
+        },
+};
+
+static const struct sh_dmae_channel sh7372_dmae_channels[] = {
+        {
+                .offset = 0,
+                .dmars = 0,
+                .dmars_bit = 0,
+        }, {
+                .offset = 0x10,
+                .dmars = 0,
+                .dmars_bit = 8,
+        }, {
+                .offset = 0x20,
+                .dmars = 4,
+                .dmars_bit = 0,
+        }, {
+                .offset = 0x30,
+                .dmars = 4,
+                .dmars_bit = 8,
+        }, {
+                .offset = 0x50,
+                .dmars = 8,
+                .dmars_bit = 0,
+        }, {
+                .offset = 0x60,
+                .dmars = 8,
+                .dmars_bit = 8,
+        }
+};
+
+static const unsigned int ts_shift[] = TS_SHIFT;
+
+static struct sh_dmae_pdata dma_platform_data = {
+        .slave          = sh7372_dmae_slaves,
+        .slave_num      = ARRAY_SIZE(sh7372_dmae_slaves),
+        .channel        = sh7372_dmae_channels,
+        .channel_num    = ARRAY_SIZE(sh7372_dmae_channels),
+        .ts_low_shift   = 3,
+        .ts_low_mask    = 0x18,
+        .ts_high_shift  = (20 - 2),     /* 2 bits for shifted low TS */
+        .ts_high_mask   = 0x00300000,
+        .ts_shift       = ts_shift,
+        .ts_shift_num   = ARRAY_SIZE(ts_shift),
+        .dmaor_init     = DMAOR_DME,
+};
+
+/* Resource order important! */
+static struct resource sh7372_dmae0_resources[] = {
+        {
+                /* Channel registers and DMAOR */
+                .start  = 0xfe008020,
+                .end    = 0xfe00808f,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* DMARSx */
+                .start  = 0xfe009000,
+                .end    = 0xfe00900b,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* DMA error IRQ */
+                .start  = 246,
+                .end    = 246,
+                .flags  = IORESOURCE_IRQ,
+        },
+        {
+                /* IRQ for channels 0-5 */
+                .start  = 240,
+                .end    = 245,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+/* Resource order important! */
+static struct resource sh7372_dmae1_resources[] = {
+        {
+                /* Channel registers and DMAOR */
+                .start  = 0xfe018020,
+                .end    = 0xfe01808f,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* DMARSx */
+                .start  = 0xfe019000,
+                .end    = 0xfe01900b,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* DMA error IRQ */
+                .start  = 254,
+                .end    = 254,
+                .flags  = IORESOURCE_IRQ,
+        },
+        {
+                /* IRQ for channels 0-5 */
+                .start  = 248,
+                .end    = 253,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+/* Resource order important! */
+static struct resource sh7372_dmae2_resources[] = {
+        {
+                /* Channel registers and DMAOR */
+                .start  = 0xfe028020,
+                .end    = 0xfe02808f,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* DMARSx */
+                .start  = 0xfe029000,
+                .end    = 0xfe02900b,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* DMA error IRQ */
+                .start  = 262,
+                .end    = 262,
+                .flags  = IORESOURCE_IRQ,
+        },
+        {
+                /* IRQ for channels 0-5 */
+                .start  = 256,
+                .end    = 261,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct platform_device dma0_device = {
+        .name           = "sh-dma-engine",
+        .id             = 0,
+        .resource       = sh7372_dmae0_resources,
+        .num_resources  = ARRAY_SIZE(sh7372_dmae0_resources),
+        .dev            = {
+                .platform_data  = &dma_platform_data,
+        },
+};
+
+static struct platform_device dma1_device = {
+        .name           = "sh-dma-engine",
+        .id             = 1,
+        .resource       = sh7372_dmae1_resources,
+        .num_resources  = ARRAY_SIZE(sh7372_dmae1_resources),
+        .dev            = {
+                .platform_data  = &dma_platform_data,
+        },
+};
+
+static struct platform_device dma2_device = {
+        .name           = "sh-dma-engine",
+        .id             = 2,
+        .resource       = sh7372_dmae2_resources,
+        .num_resources  = ARRAY_SIZE(sh7372_dmae2_resources),
+        .dev            = {
+                .platform_data  = &dma_platform_data,
+        },
+};
+
 static struct platform_device *sh7372_early_devices[] __initdata = {
         &scif0_device,
         &scif1_device,
@@ -238,6 +458,9 @@ static struct platform_device *sh7372_early_devices[] __initdata = {
         &cmt10_device,
         &iic0_device,
         &iic1_device,
+        &dma0_device,
+        &dma1_device,
+        &dma2_device,
 };
 
 void __init sh7372_add_standard_devices(void)