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authorBen Dooks <ben-linux@fluff.org>2008-01-28 13:01:20 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-01-28 13:20:50 +0000
commitc6709e8ef5752314c22c75bc7575f9be390e215b (patch)
treeb263b43370faf705141dfee1bd2d8300c00fe2c5 /arch
parent[ARM] 4779/1: S3C2412: Add s3c2412_gpio_set_sleepcfg() call (diff)
downloadlinux-dev-c6709e8ef5752314c22c75bc7575f9be390e215b.tar.xz
linux-dev-c6709e8ef5752314c22c75bc7575f9be390e215b.zip
[ARM] 4780/1: S3C2412: Allow for seperate DMA channels for TX and RX
The current S3C24XX DMA code does not allow for an peripheral that has one channel for RX and another for TX. This patch adds a per-cpu dma operation to select the transmit or receive channel, and adds support to the S3C2412 for the seperate DMA channels for TX and RX. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-s3c2412/dma.c39
-rw-r--r--arch/arm/plat-s3c24xx/dma.c16
2 files changed, 49 insertions, 6 deletions
diff --git a/arch/arm/mach-s3c2412/dma.c b/arch/arm/mach-s3c2412/dma.c
index c9cd51439126..1dd864993566 100644
--- a/arch/arm/mach-s3c2412/dma.c
+++ b/arch/arm/mach-s3c2412/dma.c
@@ -40,106 +40,141 @@ static struct s3c24xx_dma_map __initdata s3c2412_dma_mappings[] = {
[DMACH_XD0] = {
.name = "xdreq0",
.channels = MAP(S3C2412_DMAREQSEL_XDREQ0),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_XDREQ0),
},
[DMACH_XD1] = {
.name = "xdreq1",
.channels = MAP(S3C2412_DMAREQSEL_XDREQ1),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_XDREQ1),
},
[DMACH_SDI] = {
.name = "sdi",
.channels = MAP(S3C2412_DMAREQSEL_SDI),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_SDI),
.hw_addr.to = S3C2410_PA_SDI + S3C2410_SDIDATA,
.hw_addr.from = S3C2410_PA_SDI + S3C2410_SDIDATA,
},
[DMACH_SPI0] = {
.name = "spi0",
.channels = MAP(S3C2412_DMAREQSEL_SPI0TX),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_SPI0RX),
.hw_addr.to = S3C2410_PA_SPI + S3C2410_SPTDAT,
.hw_addr.from = S3C2410_PA_SPI + S3C2410_SPRDAT,
},
[DMACH_SPI1] = {
.name = "spi1",
.channels = MAP(S3C2412_DMAREQSEL_SPI1TX),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_SPI1RX),
.hw_addr.to = S3C2410_PA_SPI + S3C2412_SPI1 + S3C2410_SPTDAT,
.hw_addr.from = S3C2410_PA_SPI + S3C2412_SPI1 + S3C2410_SPRDAT,
},
[DMACH_UART0] = {
.name = "uart0",
.channels = MAP(S3C2412_DMAREQSEL_UART0_0),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_UART0_0),
.hw_addr.to = S3C2410_PA_UART0 + S3C2410_UTXH,
.hw_addr.from = S3C2410_PA_UART0 + S3C2410_URXH,
},
[DMACH_UART1] = {
.name = "uart1",
.channels = MAP(S3C2412_DMAREQSEL_UART1_0),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_UART1_0),
.hw_addr.to = S3C2410_PA_UART1 + S3C2410_UTXH,
.hw_addr.from = S3C2410_PA_UART1 + S3C2410_URXH,
},
[DMACH_UART2] = {
.name = "uart2",
.channels = MAP(S3C2412_DMAREQSEL_UART2_0),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_UART2_0),
.hw_addr.to = S3C2410_PA_UART2 + S3C2410_UTXH,
.hw_addr.from = S3C2410_PA_UART2 + S3C2410_URXH,
},
[DMACH_UART0_SRC2] = {
.name = "uart0",
.channels = MAP(S3C2412_DMAREQSEL_UART0_1),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_UART0_1),
.hw_addr.to = S3C2410_PA_UART0 + S3C2410_UTXH,
.hw_addr.from = S3C2410_PA_UART0 + S3C2410_URXH,
},
[DMACH_UART1_SRC2] = {
.name = "uart1",
.channels = MAP(S3C2412_DMAREQSEL_UART1_1),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_UART1_1),
.hw_addr.to = S3C2410_PA_UART1 + S3C2410_UTXH,
.hw_addr.from = S3C2410_PA_UART1 + S3C2410_URXH,
},
[DMACH_UART2_SRC2] = {
.name = "uart2",
.channels = MAP(S3C2412_DMAREQSEL_UART2_1),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_UART2_1),
.hw_addr.to = S3C2410_PA_UART2 + S3C2410_UTXH,
.hw_addr.from = S3C2410_PA_UART2 + S3C2410_URXH,
},
[DMACH_TIMER] = {
.name = "timer",
.channels = MAP(S3C2412_DMAREQSEL_TIMER),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_TIMER),
},
[DMACH_I2S_IN] = {
.name = "i2s-sdi",
.channels = MAP(S3C2412_DMAREQSEL_I2SRX),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_I2SRX),
.hw_addr.from = S3C2410_PA_IIS + S3C2412_IISRXD,
},
[DMACH_I2S_OUT] = {
.name = "i2s-sdo",
.channels = MAP(S3C2412_DMAREQSEL_I2STX),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_I2STX),
.hw_addr.to = S3C2410_PA_IIS + S3C2412_IISTXD,
},
[DMACH_USB_EP1] = {
.name = "usb-ep1",
.channels = MAP(S3C2412_DMAREQSEL_USBEP1),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_USBEP1),
},
[DMACH_USB_EP2] = {
.name = "usb-ep2",
.channels = MAP(S3C2412_DMAREQSEL_USBEP2),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_USBEP2),
},
[DMACH_USB_EP3] = {
.name = "usb-ep3",
.channels = MAP(S3C2412_DMAREQSEL_USBEP3),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_USBEP3),
},
[DMACH_USB_EP4] = {
.name = "usb-ep4",
.channels = MAP(S3C2412_DMAREQSEL_USBEP4),
+ .channels_rx = MAP(S3C2412_DMAREQSEL_USBEP4),
},
};
+static void s3c2412_dma_direction(struct s3c2410_dma_chan *chan,
+ struct s3c24xx_dma_map *map,
+ enum s3c2410_dmasrc dir)
+{
+ unsigned long chsel;
+
+ if (dir == S3C2410_DMASRC_HW)
+ chsel = map->channels_rx[0];
+ else
+ chsel = map->channels[0];
+
+ chsel &= ~DMA_CH_VALID;
+ chsel |= S3C2412_DMAREQSEL_HW;
+
+ writel(chsel, chan->regs + S3C2412_DMA_DMAREQSEL);
+}
+
static void s3c2412_dma_select(struct s3c2410_dma_chan *chan,
struct s3c24xx_dma_map *map)
{
- writel(map->channels[0] | S3C2412_DMAREQSEL_HW,
- chan->regs + S3C2412_DMA_DMAREQSEL);
+ s3c2412_dma_direction(chan, map, chan->source);
}
static struct s3c24xx_dma_selection __initdata s3c2412_dma_sel = {
.select = s3c2412_dma_select,
+ .direction = s3c2412_dma_direction,
.dcon_mask = 0,
.map = s3c2412_dma_mappings,
.map_size = ARRAY_SIZE(s3c2412_dma_mappings),
diff --git a/arch/arm/plat-s3c24xx/dma.c b/arch/arm/plat-s3c24xx/dma.c
index aae1b9cbaf44..10ef3995b114 100644
--- a/arch/arm/plat-s3c24xx/dma.c
+++ b/arch/arm/plat-s3c24xx/dma.c
@@ -1184,7 +1184,7 @@ int s3c2410_dma_devconfig(int channel,
dma_wrreg(chan, S3C2410_DMA_DIDSTC, (0<<1) | (0<<0));
chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DIDST);
- return 0;
+ break;
case S3C2410_DMASRC_MEM:
/* source is memory */
@@ -1195,11 +1195,19 @@ int s3c2410_dma_devconfig(int channel,
dma_wrreg(chan, S3C2410_DMA_DIDSTC, hwcfg & 3);
chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DISRC);
- return 0;
+ break;
+
+ default:
+ printk(KERN_ERR "dma%d: invalid source type (%d)\n",
+ channel, source);
+
+ return -EINVAL;
}
- printk(KERN_ERR "dma%d: invalid source type (%d)\n", channel, source);
- return -EINVAL;
+ if (dma_sel.direction != NULL)
+ (dma_sel.direction)(chan, chan->map, source);
+
+ return 0;
}
EXPORT_SYMBOL(s3c2410_dma_devconfig);