ARM: mach-shmobile: sh73a0 DMA Engine support for SY-DMAC

Add SY-DMAC support via shdma.c to the sh73a0 SoC
including slave ids, platform data and clock bindings.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 277 insertions, 1 deletions

diff --git a/arch/arm/mach-shmobile/clock-sh73a0.c b/arch/arm/mach-shmobile/clock-sh73a0.c
index f86e463f174d..bcacb1e8cf85 100644
--- a/arch/arm/mach-shmobile/clock-sh73a0.c
+++ b/arch/arm/mach-shmobile/clock-sh73a0.c
@@ -266,7 +266,8 @@ enum { MSTP001,
         MSTP129, MSTP128, MSTP127, MSTP126, MSTP125, MSTP118, MSTP116, MSTP100,
         MSTP219,
         MSTP207, MSTP206, MSTP204, MSTP203, MSTP202, MSTP201, MSTP200,
-        MSTP331, MSTP329, MSTP325, MSTP323, MSTP314, MSTP313, MSTP312, MSTP311,
+        MSTP331, MSTP329, MSTP325, MSTP323, MSTP318,
+        MSTP314, MSTP313, MSTP312, MSTP311,
         MSTP411, MSTP410, MSTP403,
         MSTP_NR };
 
@@ -295,6 +296,7 @@ static struct clk mstp_clks[MSTP_NR] = {
         [MSTP329] = MSTP(&r_clk, SMSTPCR3, 29, 0), /* CMT10 */
         [MSTP325] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR3, 25, 0), /* IrDA */
         [MSTP323] = MSTP(&div4_clks[DIV4_HP], SMSTPCR3, 23, 0), /* IIC1 */
+        [MSTP318] = MSTP(&div4_clks[DIV4_HP], SMSTPCR3, 18, 0), /* SY-DMAC */
         [MSTP314] = MSTP(&div6_clks[DIV6_SDHI0], SMSTPCR3, 14, 0), /* SDHI0 */
         [MSTP313] = MSTP(&div6_clks[DIV6_SDHI1], SMSTPCR3, 13, 0), /* SDHI1 */
         [MSTP312] = MSTP(&div4_clks[DIV4_HP], SMSTPCR3, 12, 0), /* MMCIF0 */
@@ -347,6 +349,7 @@ static struct clk_lookup lookups[] = {
         CLKDEV_DEV_ID("sh_cmt.10", &mstp_clks[MSTP329]), /* CMT10 */
         CLKDEV_DEV_ID("sh_irda.0", &mstp_clks[MSTP325]), /* IrDA */
         CLKDEV_DEV_ID("i2c-sh_mobile.1", &mstp_clks[MSTP323]), /* I2C1 */
+        CLKDEV_DEV_ID("sh-dma-engine.0", &mstp_clks[MSTP318]), /* SY-DMAC */
         CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[MSTP314]), /* SDHI0 */
         CLKDEV_DEV_ID("sh_mobile_sdhi.1", &mstp_clks[MSTP313]), /* SDHI1 */
         CLKDEV_DEV_ID("sh_mmcif.0", &mstp_clks[MSTP312]), /* MMCIF0 */
diff --git a/arch/arm/mach-shmobile/include/mach/sh73a0.h b/arch/arm/mach-shmobile/include/mach/sh73a0.h
index ceb2cdc92bf9..97c47f43ccf9 100644
--- a/arch/arm/mach-shmobile/include/mach/sh73a0.h
+++ b/arch/arm/mach-shmobile/include/mach/sh73a0.h
@@ -463,5 +463,34 @@ enum {
         GPIO_FN_FSIAIBT_PU,
         GPIO_FN_FSIAISLD_PU,
 };
+/* DMA slave IDs */
+enum {
+        SHDMA_SLAVE_SCIF0_TX,
+        SHDMA_SLAVE_SCIF0_RX,
+        SHDMA_SLAVE_SCIF1_TX,
+        SHDMA_SLAVE_SCIF1_RX,
+        SHDMA_SLAVE_SCIF2_TX,
+        SHDMA_SLAVE_SCIF2_RX,
+        SHDMA_SLAVE_SCIF3_TX,
+        SHDMA_SLAVE_SCIF3_RX,
+        SHDMA_SLAVE_SCIF4_TX,
+        SHDMA_SLAVE_SCIF4_RX,
+        SHDMA_SLAVE_SCIF5_TX,
+        SHDMA_SLAVE_SCIF5_RX,
+        SHDMA_SLAVE_SCIF6_TX,
+        SHDMA_SLAVE_SCIF6_RX,
+        SHDMA_SLAVE_SCIF7_TX,
+        SHDMA_SLAVE_SCIF7_RX,
+        SHDMA_SLAVE_SCIF8_TX,
+        SHDMA_SLAVE_SCIF8_RX,
+        SHDMA_SLAVE_SDHI0_TX,
+        SHDMA_SLAVE_SDHI0_RX,
+        SHDMA_SLAVE_SDHI1_TX,
+        SHDMA_SLAVE_SDHI1_RX,
+        SHDMA_SLAVE_SDHI2_TX,
+        SHDMA_SLAVE_SDHI2_RX,
+        SHDMA_SLAVE_MMCIF_TX,
+        SHDMA_SLAVE_MMCIF_RX,
+};
 
 #endif /* __ASM_SH73A0_H__ */
diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c
index 685c40a2f5e6..e46821c0a62e 100644
--- a/arch/arm/mach-shmobile/setup-sh73a0.c
+++ b/arch/arm/mach-shmobile/setup-sh73a0.c
@@ -27,9 +27,11 @@
 #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/sh73a0.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 
@@ -392,6 +394,242 @@ static struct platform_device i2c4_device = {
         .num_resources  = ARRAY_SIZE(i2c4_resources),
 };
 
+/* 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)))
+#define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL((xmit_sz)))
+#define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL((xmit_sz)))
+
+static const struct sh_dmae_slave_config sh73a0_dmae_slaves[] = {
+        {
+                .slave_id       = SHDMA_SLAVE_SCIF0_TX,
+                .addr           = 0xe6c40020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x21,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF0_RX,
+                .addr           = 0xe6c40024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x22,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF1_TX,
+                .addr           = 0xe6c50020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x25,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF1_RX,
+                .addr           = 0xe6c50024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x26,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF2_TX,
+                .addr           = 0xe6c60020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x29,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF2_RX,
+                .addr           = 0xe6c60024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x2a,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF3_TX,
+                .addr           = 0xe6c70020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x2d,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF3_RX,
+                .addr           = 0xe6c70024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x2e,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF4_TX,
+                .addr           = 0xe6c80020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x39,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF4_RX,
+                .addr           = 0xe6c80024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x3a,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF5_TX,
+                .addr           = 0xe6cb0020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x35,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF5_RX,
+                .addr           = 0xe6cb0024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x36,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF6_TX,
+                .addr           = 0xe6cc0020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x1d,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF6_RX,
+                .addr           = 0xe6cc0024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x1e,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF7_TX,
+                .addr           = 0xe6cd0020,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x19,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF7_RX,
+                .addr           = 0xe6cd0024,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x1a,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF8_TX,
+                .addr           = 0xe6c30040,
+                .chcr           = CHCR_TX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x3d,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SCIF8_RX,
+                .addr           = 0xe6c30060,
+                .chcr           = CHCR_RX(XMIT_SZ_8BIT),
+                .mid_rid        = 0x3e,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI0_TX,
+                .addr           = 0xee100030,
+                .chcr           = CHCR_TX(XMIT_SZ_16BIT),
+                .mid_rid        = 0xc1,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI0_RX,
+                .addr           = 0xee100030,
+                .chcr           = CHCR_RX(XMIT_SZ_16BIT),
+                .mid_rid        = 0xc2,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI1_TX,
+                .addr           = 0xee120030,
+                .chcr           = CHCR_TX(XMIT_SZ_16BIT),
+                .mid_rid        = 0xc9,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI1_RX,
+                .addr           = 0xee120030,
+                .chcr           = CHCR_RX(XMIT_SZ_16BIT),
+                .mid_rid        = 0xca,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI2_TX,
+                .addr           = 0xee140030,
+                .chcr           = CHCR_TX(XMIT_SZ_16BIT),
+                .mid_rid        = 0xcd,
+        }, {
+                .slave_id       = SHDMA_SLAVE_SDHI2_RX,
+                .addr           = 0xee140030,
+                .chcr           = CHCR_RX(XMIT_SZ_16BIT),
+                .mid_rid        = 0xce,
+        }, {
+                .slave_id       = SHDMA_SLAVE_MMCIF_TX,
+                .addr           = 0xe6bd0034,
+                .chcr           = CHCR_TX(XMIT_SZ_32BIT),
+                .mid_rid        = 0xd1,
+        }, {
+                .slave_id       = SHDMA_SLAVE_MMCIF_RX,
+                .addr           = 0xe6bd0034,
+                .chcr           = CHCR_RX(XMIT_SZ_32BIT),
+                .mid_rid        = 0xd2,
+        },
+};
+
+#define DMAE_CHANNEL(_offset)                                   \
+        {                                                       \
+                .offset         = _offset - 0x20,               \
+                .dmars          = _offset - 0x20 + 0x40,        \
+        }
+
+static const struct sh_dmae_channel sh73a0_dmae_channels[] = {
+        DMAE_CHANNEL(0x8000),
+        DMAE_CHANNEL(0x8080),
+        DMAE_CHANNEL(0x8100),
+        DMAE_CHANNEL(0x8180),
+        DMAE_CHANNEL(0x8200),
+        DMAE_CHANNEL(0x8280),
+        DMAE_CHANNEL(0x8300),
+        DMAE_CHANNEL(0x8380),
+        DMAE_CHANNEL(0x8400),
+        DMAE_CHANNEL(0x8480),
+        DMAE_CHANNEL(0x8500),
+        DMAE_CHANNEL(0x8580),
+        DMAE_CHANNEL(0x8600),
+        DMAE_CHANNEL(0x8680),
+        DMAE_CHANNEL(0x8700),
+        DMAE_CHANNEL(0x8780),
+        DMAE_CHANNEL(0x8800),
+        DMAE_CHANNEL(0x8880),
+        DMAE_CHANNEL(0x8900),
+        DMAE_CHANNEL(0x8980),
+};
+
+static const unsigned int ts_shift[] = TS_SHIFT;
+
+static struct sh_dmae_pdata sh73a0_dmae_platform_data = {
+        .slave          = sh73a0_dmae_slaves,
+        .slave_num      = ARRAY_SIZE(sh73a0_dmae_slaves),
+        .channel        = sh73a0_dmae_channels,
+        .channel_num    = ARRAY_SIZE(sh73a0_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,
+};
+
+static struct resource sh73a0_dmae_resources[] = {
+        {
+                /* Registers including DMAOR and channels including DMARSx */
+                .start  = 0xfe000020,
+                .end    = 0xfe008a00 - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* DMA error IRQ */
+                .start  = gic_spi(129),
+                .end    = gic_spi(129),
+                .flags  = IORESOURCE_IRQ,
+        },
+        {
+                /* IRQ for channels 0-19 */
+                .start  = gic_spi(109),
+                .end    = gic_spi(128),
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct platform_device dma0_device = {
+        .name           = "sh-dma-engine",
+        .id             = 0,
+        .resource       = sh73a0_dmae_resources,
+        .num_resources  = ARRAY_SIZE(sh73a0_dmae_resources),
+        .dev            = {
+                .platform_data  = &sh73a0_dmae_platform_data,
+        },
+};
+
 static struct platform_device *sh73a0_early_devices[] __initdata = {
         &scif0_device,
         &scif1_device,
@@ -413,10 +651,16 @@ static struct platform_device *sh73a0_late_devices[] __initdata = {
         &i2c2_device,
         &i2c3_device,
         &i2c4_device,
+        &dma0_device,
 };
 
+#define SRCR2          0xe61580b0
+
 void __init sh73a0_add_standard_devices(void)
 {
+        /* Clear software reset bit on SY-DMAC module */
+        __raw_writel(__raw_readl(SRCR2) & ~(1 << 18), SRCR2);
+
         platform_add_devices(sh73a0_early_devices,
                             ARRAY_SIZE(sh73a0_early_devices));
         platform_add_devices(sh73a0_late_devices,