From: Ben Dooks Date: Mon, 28 Jan 2008 12:01:20 +0000 (+0100) Subject: [ARM] 4780/1: S3C2412: Allow for seperate DMA channels for TX and RX X-Git-Tag: v2.6.25-rc1~1175^2~2^9~15 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c6709e8ef5752314c22c75bc7575f9be390e215b;p=linux-2.6 [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 Signed-off-by: Russell King --- diff --git a/arch/arm/mach-s3c2412/dma.c b/arch/arm/mach-s3c2412/dma.c index c9cd514391..1dd8649935 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 aae1b9cbaf..10ef3995b1 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); diff --git a/include/asm-arm/plat-s3c24xx/dma.h b/include/asm-arm/plat-s3c24xx/dma.h index 2c59406435..c78efe316f 100644 --- a/include/asm-arm/plat-s3c24xx/dma.h +++ b/include/asm-arm/plat-s3c24xx/dma.h @@ -32,6 +32,7 @@ struct s3c24xx_dma_map { struct s3c24xx_dma_addr hw_addr; unsigned long channels[S3C2410_DMA_CHANNELS]; + unsigned long channels_rx[S3C2410_DMA_CHANNELS]; }; struct s3c24xx_dma_selection { @@ -41,6 +42,10 @@ struct s3c24xx_dma_selection { void (*select)(struct s3c2410_dma_chan *chan, struct s3c24xx_dma_map *map); + + void (*direction)(struct s3c2410_dma_chan *chan, + struct s3c24xx_dma_map *map, + enum s3c2410_dmasrc dir); }; extern int s3c24xx_dma_init_map(struct s3c24xx_dma_selection *sel);