From 10d11b6b5410b9d31845efd23147fd08477a5151 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= Date: Sat, 3 Oct 2015 22:22:55 +0200 Subject: [PATCH] dmaengine: bcm2835: Load driver early and support legacy API MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Load driver early since at least bcm2708_fb doesn't support deferred probing and even if it did, we don't want the video driver deferred. Support the legacy DMA API which is needed by bcm2708_fb. Don't mask out channel 2. Signed-off-by: Noralf Trønnes --- drivers/dma/Kconfig | 2 +- drivers/dma/bcm2835-dma.c | 26 +++++++++++++++++++++++++- 2 files changed, 26 insertions(+), 2 deletions(-) --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -131,7 +131,7 @@ config COH901318 config DMA_BCM2835 tristate "BCM2835 DMA engine support" - depends on ARCH_BCM2835 + depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709 select DMA_ENGINE select DMA_VIRTUAL_CHANNELS --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -48,6 +49,7 @@ #define BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED 14 #define BCM2835_DMA_CHAN_NAME_SIZE 8 +#define BCM2835_DMA_BULK_MASK BIT(0) struct bcm2835_dmadev { struct dma_device ddev; @@ -914,6 +916,9 @@ static int bcm2835_dma_probe(struct plat base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); + rc = bcm_dmaman_probe(pdev, base, BCM2835_DMA_BULK_MASK); + if (rc) + dev_err(&pdev->dev, "Failed to initialize the legacy API\n"); od->base = base; @@ -952,6 +957,9 @@ static int bcm2835_dma_probe(struct plat goto err_no_dma; } + /* Channel 0 is used by the legacy API */ + chans_available &= ~BCM2835_DMA_BULK_MASK; + /* get irqs for each channel that we support */ for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) { /* skip masked out channels */ @@ -1026,6 +1034,7 @@ static int bcm2835_dma_remove(struct pla { struct bcm2835_dmadev *od = platform_get_drvdata(pdev); + bcm_dmaman_remove(pdev); dma_async_device_unregister(&od->ddev); bcm2835_dma_free(od); @@ -1041,7 +1050,22 @@ static struct platform_driver bcm2835_dm }, }; -module_platform_driver(bcm2835_dma_driver); +static int bcm2835_dma_init(void) +{ + return platform_driver_register(&bcm2835_dma_driver); +} + +static void bcm2835_dma_exit(void) +{ + platform_driver_unregister(&bcm2835_dma_driver); +} + +/* + * Load after serial driver (arch_initcall) so we see the messages if it fails, + * but before drivers (module_init) that need a DMA channel. + */ +subsys_initcall(bcm2835_dma_init); +module_exit(bcm2835_dma_exit); MODULE_ALIAS("platform:bcm2835-dma"); MODULE_DESCRIPTION("BCM2835 DMA engine driver");