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From ef68b1e7c830c23cf87a927474b5e53da14d9bac Mon Sep 17 00:00:00 2001
From: Martin Sperl <kernel@martin.sperl.org>
Date: Fri, 22 Apr 2016 17:17:30 +0000
Subject: [PATCH] Revert "dmaengine: bcm2835: Load driver early and support
legacy API"
This reverts commit 6f56fff39c811953809b011f59c49a2122c4d173.
---
drivers/dma/Kconfig | 2 +-
drivers/dma/bcm2835-dma.c | 30 ++++++------------------------
2 files changed, 7 insertions(+), 25 deletions(-)
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -108,7 +108,7 @@ config COH901318
config DMA_BCM2835
tristate "BCM2835 DMA engine support"
- depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709
+ depends on ARCH_BCM2835
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -36,7 +36,6 @@
#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>
@@ -787,10 +786,6 @@ static int bcm2835_dma_probe(struct plat
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;
dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
@@ -823,8 +818,11 @@ 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;
+ /*
+ * Do not use the FIQ and BULK channels,
+ * because they are used by the GPU.
+ */
+ chans_available &= ~(BCM2835_DMA_FIQ_MASK | BCM2835_DMA_BULK_MASK);
for (i = 0; i < pdev->num_resources; i++) {
irq = platform_get_irq(pdev, i);
@@ -868,7 +866,6 @@ 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);
@@ -884,22 +881,7 @@ static struct platform_driver bcm2835_dm
},
};
-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_platform_driver(bcm2835_dma_driver);
MODULE_ALIAS("platform:bcm2835-dma");
MODULE_DESCRIPTION("BCM2835 DMA engine driver");
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