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65 lines
2.0 KiB
65 lines
2.0 KiB
From 32530970c34f0e8e447fd9a7f8991df6f04b8ccc Mon Sep 17 00:00:00 2001
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From: Matthias Reichl <hias@horus.com>
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Date: Sun, 11 Oct 2015 16:44:05 +0200
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Subject: [PATCH] bcm2835-i2s: get base address for DMA from devicetree
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Code copied from spi-bcm2835. Get physical address from devicetree
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instead of using hardcoded constant.
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Signed-off-by: Matthias Reichl <hias@horus.com>
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---
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sound/soc/bcm/bcm2835-i2s.c | 20 ++++++++++++--------
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1 file changed, 12 insertions(+), 8 deletions(-)
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--- a/sound/soc/bcm/bcm2835-i2s.c
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+++ b/sound/soc/bcm/bcm2835-i2s.c
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@@ -38,6 +38,7 @@
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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+#include <linux/of_address.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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@@ -158,10 +159,6 @@ static const unsigned int bcm2835_clk_fr
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#define BCM2835_I2S_INT_RXR BIT(1)
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#define BCM2835_I2S_INT_TXW BIT(0)
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-/* I2S DMA interface */
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-/* FIXME: Needs IOMMU support */
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-#define BCM2835_VCMMU_SHIFT (0x7E000000 - 0x20000000)
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-
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/* General device struct */
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struct bcm2835_i2s_dev {
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struct device *dev;
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@@ -791,6 +788,15 @@ static int bcm2835_i2s_probe(struct plat
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int ret;
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struct regmap *regmap[2];
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struct resource *mem[2];
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+ const __be32 *addr;
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+ dma_addr_t dma_reg_base;
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+
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+ addr = of_get_address(pdev->dev.of_node, 0, NULL, NULL);
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+ if (!addr) {
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+ dev_err(&pdev->dev, "could not get DMA-register address\n");
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+ return -ENODEV;
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+ }
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+ dma_reg_base = be32_to_cpup(addr);
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/* Request both ioareas */
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for (i = 0; i <= 1; i++) {
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@@ -817,12 +823,10 @@ static int bcm2835_i2s_probe(struct plat
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/* Set the DMA address */
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dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
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- (dma_addr_t)mem[0]->start + BCM2835_I2S_FIFO_A_REG
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- + BCM2835_VCMMU_SHIFT;
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+ dma_reg_base + BCM2835_I2S_FIFO_A_REG;
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dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
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- (dma_addr_t)mem[0]->start + BCM2835_I2S_FIFO_A_REG
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- + BCM2835_VCMMU_SHIFT;
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+ dma_reg_base + BCM2835_I2S_FIFO_A_REG;
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/* Set the bus width */
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dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr_width =
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