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ARM: shmobile: r8a7740: add DMAEngine support for USB

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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>
This commit is contained in:
Kuninori Morimoto
2012-06-25 03:37:10 -07:00
committed by Rafael J. Wysocki
parent cb76eb812e
commit dbf382e556
3 changed files with 92 additions and 1 deletions
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87
arch/arm/mach-shmobile/setup-r8a7740.c
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@@ -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,
};
/*