diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0016-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0016-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0016-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch b/target/linux/brcm2708/patches-4.14/950-0016-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch new file mode 100644 index 0000000000..bb14791bad --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0016-dmaengine-bcm2835-Load-driver-early-and-support-lega.patch @@ -0,0 +1,101 @@ +From 8a9eb6f0ef9e548aaa5ac60e95e4c0c9c99adcab Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org> +Date: Sat, 3 Oct 2015 22:22:55 +0200 +Subject: [PATCH 016/454] 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 <noralf@tronnes.org> +--- + 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 <linux/interrupt.h> + #include <linux/list.h> + #include <linux/module.h> ++#include <linux/platform_data/dma-bcm2708.h> + #include <linux/platform_device.h> + #include <linux/slab.h> + #include <linux/io.h> +@@ -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; +@@ -925,6 +927,9 @@ 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; + +@@ -962,6 +967,9 @@ 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 */ +@@ -1036,6 +1044,7 @@ 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); + +@@ -1051,7 +1060,22 @@ 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"); |