ARM: shmobile: r8a7740: add DMAEngine support for USB

Current shdmac can support USB DMAC on r8a7740.
This support reduce CPU duty when USB access.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

3 files changed, 92 insertions, 1 deletions

diff --git a/arch/arm/mach-shmobile/clock-r8a7740.c b/arch/arm/mach-shmobile/clock-r8a7740.c
index 39b131101167..daf3eace5dcf 100644
--- a/arch/arm/mach-shmobile/clock-r8a7740.c
+++ b/arch/arm/mach-shmobile/clock-r8a7740.c
@@ -463,7 +463,7 @@ enum {
 
         MSTP230,
         MSTP222,
-        MSTP218, MSTP217, MSTP216,
+        MSTP218, MSTP217, MSTP216, MSTP214,
         MSTP207, MSTP206, MSTP204, MSTP203, MSTP202, MSTP201, MSTP200,
 
         MSTP329, MSTP328, MSTP323, MSTP320,
@@ -489,6 +489,7 @@ static struct clk mstp_clks[MSTP_NR] = {
         [MSTP218] = SH_CLK_MSTP32(&div4_clks[DIV4_HP],  SMSTPCR2, 18, 0), /* DMAC1 */
         [MSTP217] = SH_CLK_MSTP32(&div4_clks[DIV4_HP],  SMSTPCR2, 17, 0), /* DMAC2 */
         [MSTP216] = SH_CLK_MSTP32(&div4_clks[DIV4_HP],  SMSTPCR2, 16, 0), /* DMAC3 */
+        [MSTP214] = SH_CLK_MSTP32(&div4_clks[DIV4_HP],  SMSTPCR2, 14, 0), /* USBDMAC */
         [MSTP207] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB], SMSTPCR2,  7, 0), /* SCIFA5 */
         [MSTP206] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB], SMSTPCR2,  6, 0), /* SCIFB */
         [MSTP204] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB], SMSTPCR2,  4, 0), /* SCIFA0 */
@@ -567,6 +568,7 @@ static struct clk_lookup lookups[] = {
         CLKDEV_DEV_ID("sh-sci.0",               &mstp_clks[MSTP204]),
         CLKDEV_DEV_ID("sh-sci.8",               &mstp_clks[MSTP206]),
         CLKDEV_DEV_ID("sh-sci.5",               &mstp_clks[MSTP207]),
+        CLKDEV_DEV_ID("sh-dma-engine.3",        &mstp_clks[MSTP214]),
         CLKDEV_DEV_ID("sh-dma-engine.2",        &mstp_clks[MSTP216]),
         CLKDEV_DEV_ID("sh-dma-engine.1",        &mstp_clks[MSTP217]),
         CLKDEV_DEV_ID("sh-dma-engine.0",        &mstp_clks[MSTP218]),
diff --git a/arch/arm/mach-shmobile/include/mach/r8a7740.h b/arch/arm/mach-shmobile/include/mach/r8a7740.h
index 0f14ce8d9f01..8bd7b9c136a1 100644
--- a/arch/arm/mach-shmobile/include/mach/r8a7740.h
+++ b/arch/arm/mach-shmobile/include/mach/r8a7740.h
@@ -600,6 +600,8 @@ enum {
         SHDMA_SLAVE_FSIA_RX,
         SHDMA_SLAVE_FSIA_TX,
         SHDMA_SLAVE_FSIB_TX,
+        SHDMA_SLAVE_USBHS_TX,
+        SHDMA_SLAVE_USBHS_RX,
 };
 
 #endif /* __ASM_R8A7740_H__ */
diff --git a/arch/arm/mach-shmobile/setup-r8a7740.c b/arch/arm/mach-shmobile/setup-r8a7740.c
index 320c43af8614..5e84609e82d2 100644
--- a/arch/arm/mach-shmobile/setup-r8a7740.c
+++ b/arch/arm/mach-shmobile/setup-r8a7740.c
@@ -501,6 +501,92 @@ static struct platform_device dma2_device = {
         },
 };
 
+/* USB-DMAC */
+/* Transmit sizes and respective CHCR register values */
+enum {
+        USBTS_XMIT_SZ_8BYTE             = 0,
+        USBTS_XMIT_SZ_16BYTE            = 1,
+        USBTS_XMIT_SZ_32BYTE            = 2,
+};
+
+/* log2(size / 8) - used to calculate number of transfers */
+static const unsigned int dma_usbts_shift[] = {
+        [USBTS_XMIT_SZ_8BYTE]   = 3,
+        [USBTS_XMIT_SZ_16BYTE]  = 4,
+        [USBTS_XMIT_SZ_32BYTE]  = 5,
+};
+
+static const struct sh_dmae_channel r8a7740_usb_dma_channels[] = {
+        {
+                .offset = 0,
+        }, {
+                .offset = 0x20,
+        },
+};
+
+#define USBTS_INDEX2VAL(i) (((i) & 3) << 6)
+
+static const struct sh_dmae_slave_config r8a7740_usb_dma_slaves[] = {
+        {
+                .slave_id       = SHDMA_SLAVE_USBHS_TX,
+                .chcr           = USBTS_INDEX2VAL(USBTS_XMIT_SZ_8BYTE),
+        }, {
+                .slave_id       = SHDMA_SLAVE_USBHS_RX,
+                .chcr           = USBTS_INDEX2VAL(USBTS_XMIT_SZ_8BYTE),
+        },
+};
+
+static struct sh_dmae_pdata usb_dma_platform_data = {
+        .slave          = r8a7740_usb_dma_slaves,
+        .slave_num      = ARRAY_SIZE(r8a7740_usb_dma_slaves),
+        .channel        = r8a7740_usb_dma_channels,
+        .channel_num    = ARRAY_SIZE(r8a7740_usb_dma_channels),
+        .ts_low_shift   = 6,
+        .ts_low_mask    = 0xc0,
+        .ts_high_shift  = 0,
+        .ts_high_mask   = 0,
+        .ts_shift       = dma_usbts_shift,
+        .ts_shift_num   = ARRAY_SIZE(dma_usbts_shift),
+        .dmaor_init     = DMAOR_DME,
+        .chcr_offset    = 0x14,
+        .chcr_ie_bit    = 1 << 5,
+        .dmaor_is_32bit = 1,
+        .needs_tend_set = 1,
+        .no_dmars       = 1,
+        .slave_only     = 1,
+};
+
+static struct resource r8a7740_usb_dma_resources[] = {
+        {
+                /* Channel registers and DMAOR */
+                .start  = 0xe68a0020,
+                .end    = 0xe68a0064 - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* VCR/SWR/DMICR */
+                .start  = 0xe68a0000,
+                .end    = 0xe68a0014 - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                /* IRQ for channels */
+                .start  = evt2irq(0x0a00),
+                .end    = evt2irq(0x0a00),
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct platform_device usb_dma_device = {
+        .name           = "sh-dma-engine",
+        .id             = 3,
+        .resource       = r8a7740_usb_dma_resources,
+        .num_resources  = ARRAY_SIZE(r8a7740_usb_dma_resources),
+        .dev            = {
+                .platform_data  = &usb_dma_platform_data,
+        },
+};
+
 /* I2C */
 static struct resource i2c0_resources[] = {
         [0] = {
@@ -550,6 +636,7 @@ static struct platform_device *r8a7740_late_devices[] __initdata = {
         &dma0_device,
         &dma1_device,
         &dma2_device,
+        &usb_dma_device,
 };
 
 /*