From 0b04ddf8638ca5652b1f7ab7794beb363942407d Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Fri, 7 Nov 2014 12:15:47 +0800 Subject: dmaengine: sun6i: Add support for Allwinner A23 (sun8i) variant The A23 SoC has the same dma engine as the A31 (sun6i), with a reduced amount of endpoints and physical channels. Add the proper config data and compatible string to support it. A slight difference in sun8i is an undocumented register needs to be toggled for dma to function. Signed-off-by: Chen-Yu Tsai Acked-by: Maxime Ripard Signed-off-by: Vinod Koul --- drivers/dma/Kconfig | 4 ++-- drivers/dma/sun6i-dma.c | 27 +++++++++++++++++++++++++++ 2 files changed, 29 insertions(+), 2 deletions(-) (limited to 'drivers/dma') diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 607271a..aef8b9d 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -402,12 +402,12 @@ config XILINX_VDMA config DMA_SUN6I tristate "Allwinner A31 SoCs DMA support" - depends on MACH_SUN6I || COMPILE_TEST + depends on MACH_SUN6I || MACH_SUN8I || COMPILE_TEST depends on RESET_CONTROLLER select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help - Support for the DMA engine for Allwinner A31 SoCs. + Support for the DMA engine first found in Allwinner A31 SoCs. config NBPFAXI_DMA tristate "Renesas Type-AXI NBPF DMA support" diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c index 531abbf..f9f8f4d 100644 --- a/drivers/dma/sun6i-dma.c +++ b/drivers/dma/sun6i-dma.c @@ -43,6 +43,12 @@ #define DMA_STAT 0x30 /* + * sun8i specific registers + */ +#define SUN8I_DMA_GATE 0x20 +#define SUN8I_DMA_GATE_ENABLE 0x4 + +/* * Channels specific registers */ #define DMA_CHAN_ENABLE 0x00 @@ -878,8 +884,20 @@ static struct sun6i_dma_config sun6i_a31_dma_cfg = { .nr_max_vchans = 53, }; +/* + * The A23 only has 8 physical channels, a maximum DRQ port id of 24, + * and a total of 37 usable source and destination endpoints. + */ + +static struct sun6i_dma_config sun8i_a23_dma_cfg = { + .nr_max_channels = 8, + .nr_max_requests = 24, + .nr_max_vchans = 37, +}; + static struct of_device_id sun6i_dma_match[] = { { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg }, + { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg }, { /* sentinel */ } }; @@ -1007,6 +1025,15 @@ static int sun6i_dma_probe(struct platform_device *pdev) goto err_dma_unregister; } + /* + * sun8i variant requires us to toggle a dma gating register, + * as seen in Allwinner's SDK. This register is not documented + * in the A23 user manual. + */ + if (of_device_is_compatible(pdev->dev.of_node, + "allwinner,sun8i-a23-dma")) + writel(SUN8I_DMA_GATE_ENABLE, sdc->base + SUN8I_DMA_GATE); + return 0; err_dma_unregister: -- cgit v1.1