From 4972a80e16a206149729be887285f4494b6826dc Mon Sep 17 00:00:00 2001 From: Thomas Abraham Date: Mon, 24 Oct 2011 11:43:38 +0200 Subject: [PATCH] ARM: SAMSUNG: Add device tree support for pl330 dma engine wrappers A new dma request id 'DMACH_DT_PROP' is introduced for client drivers requesting a dma channel. This request indicates that a device tree node property represting the dma channel is available in 'struct samsung_dma_info'. The dma channel request wrapper uses the node property value as the value for the filter parameter. Signed-off-by: Thomas Abraham Acked-by: Grant Likely Signed-off-by: Kukjin Kim --- arch/arm/plat-samsung/dma-ops.c | 9 ++++++++- arch/arm/plat-samsung/include/plat/dma-ops.h | 1 + arch/arm/plat-samsung/include/plat/dma-pl330.h | 3 ++- 3 files changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c index 889c2c2..2cded87 100644 --- a/arch/arm/plat-samsung/dma-ops.c +++ b/arch/arm/plat-samsung/dma-ops.c @@ -24,11 +24,18 @@ static unsigned samsung_dmadev_request(enum dma_ch dma_ch, struct dma_chan *chan; dma_cap_mask_t mask; struct dma_slave_config slave_config; + void *filter_param; dma_cap_zero(mask); dma_cap_set(info->cap, mask); - chan = dma_request_channel(mask, pl330_filter, (void *)dma_ch); + /* + * If a dma channel property of a device node from device tree is + * specified, use that as the fliter parameter. + */ + filter_param = (dma_ch == DMACH_DT_PROP) ? (void *)info->dt_dmach_prop : + (void *)dma_ch; + chan = dma_request_channel(mask, pl330_filter, filter_param); if (info->direction == DMA_FROM_DEVICE) { memset(&slave_config, 0, sizeof(struct dma_slave_config)); diff --git a/arch/arm/plat-samsung/include/plat/dma-ops.h b/arch/arm/plat-samsung/include/plat/dma-ops.h index 4c1a363..22eafc3 100644 --- a/arch/arm/plat-samsung/include/plat/dma-ops.h +++ b/arch/arm/plat-samsung/include/plat/dma-ops.h @@ -31,6 +31,7 @@ struct samsung_dma_info { enum dma_slave_buswidth width; dma_addr_t fifo; struct s3c2410_dma_client *client; + struct property *dt_dmach_prop; }; struct samsung_dma_ops { diff --git a/arch/arm/plat-samsung/include/plat/dma-pl330.h b/arch/arm/plat-samsung/include/plat/dma-pl330.h index 2e55e59..c5eaad5 100644 --- a/arch/arm/plat-samsung/include/plat/dma-pl330.h +++ b/arch/arm/plat-samsung/include/plat/dma-pl330.h @@ -21,7 +21,8 @@ * use these just as IDs. */ enum dma_ch { - DMACH_UART0_RX, + DMACH_DT_PROP = -1, + DMACH_UART0_RX = 0, DMACH_UART0_TX, DMACH_UART1_RX, DMACH_UART1_TX, -- 2.7.4