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a1383655cf
Tested on bcm2710 (Raspberry Pi 3B). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
102 lines
3.0 KiB
Diff
102 lines
3.0 KiB
Diff
From 9a111b4b03340341604941cb7611a2b1d16e8edd Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
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Date: Sat, 3 Oct 2015 22:22:55 +0200
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Subject: [PATCH] dmaengine: bcm2835: Load driver early and support
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legacy API
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Load driver early since at least bcm2708_fb doesn't support deferred
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probing and even if it did, we don't want the video driver deferred.
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Support the legacy DMA API which is needed by bcm2708_fb.
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Don't mask out channel 2.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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---
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drivers/dma/Kconfig | 2 +-
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drivers/dma/bcm2835-dma.c | 26 +++++++++++++++++++++++++-
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2 files changed, 26 insertions(+), 2 deletions(-)
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--- a/drivers/dma/Kconfig
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+++ b/drivers/dma/Kconfig
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@@ -133,7 +133,7 @@ config COH901318
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config DMA_BCM2835
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tristate "BCM2835 DMA engine support"
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- depends on ARCH_BCM2835
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+ depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709
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select DMA_ENGINE
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select DMA_VIRTUAL_CHANNELS
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--- a/drivers/dma/bcm2835-dma.c
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+++ b/drivers/dma/bcm2835-dma.c
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@@ -25,6 +25,7 @@
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/module.h>
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+#include <linux/platform_data/dma-bcm2708.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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@@ -36,6 +37,7 @@
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#define BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED 14
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#define BCM2835_DMA_CHAN_NAME_SIZE 8
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+#define BCM2835_DMA_BULK_MASK BIT(0)
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/**
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* struct bcm2835_dmadev - BCM2835 DMA controller
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@@ -912,6 +914,9 @@ static int bcm2835_dma_probe(struct plat
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base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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+ rc = bcm_dmaman_probe(pdev, base, BCM2835_DMA_BULK_MASK);
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+ if (rc)
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+ dev_err(&pdev->dev, "Failed to initialize the legacy API\n");
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od->base = base;
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@@ -957,6 +962,9 @@ static int bcm2835_dma_probe(struct plat
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goto err_no_dma;
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}
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+ /* Channel 0 is used by the legacy API */
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+ chans_available &= ~BCM2835_DMA_BULK_MASK;
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+
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/* get irqs for each channel that we support */
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for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) {
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/* skip masked out channels */
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@@ -1031,6 +1039,7 @@ static int bcm2835_dma_remove(struct pla
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{
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struct bcm2835_dmadev *od = platform_get_drvdata(pdev);
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+ bcm_dmaman_remove(pdev);
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dma_async_device_unregister(&od->ddev);
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bcm2835_dma_free(od);
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@@ -1046,7 +1055,22 @@ static struct platform_driver bcm2835_dm
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},
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};
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-module_platform_driver(bcm2835_dma_driver);
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+static int bcm2835_dma_init(void)
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+{
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+ return platform_driver_register(&bcm2835_dma_driver);
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+}
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+
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+static void bcm2835_dma_exit(void)
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+{
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+ platform_driver_unregister(&bcm2835_dma_driver);
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+}
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+
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+/*
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+ * Load after serial driver (arch_initcall) so we see the messages if it fails,
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+ * but before drivers (module_init) that need a DMA channel.
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+ */
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+subsys_initcall(bcm2835_dma_init);
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+module_exit(bcm2835_dma_exit);
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MODULE_ALIAS("platform:bcm2835-dma");
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MODULE_DESCRIPTION("BCM2835 DMA engine driver");
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