diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0014-bcm2835-i2s-get-base-address-for-DMA-from-devicetree.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0014-bcm2835-i2s-get-base-address-for-DMA-from-devicetree.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0014-bcm2835-i2s-get-base-address-for-DMA-from-devicetree.patch b/target/linux/brcm2708/patches-4.4/0014-bcm2835-i2s-get-base-address-for-DMA-from-devicetree.patch new file mode 100644 index 0000000000..0c36bda8bf --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0014-bcm2835-i2s-get-base-address-for-DMA-from-devicetree.patch @@ -0,0 +1,65 @@ +From c8225021ad8a8e8d2b4560bed644c5552f9f6684 Mon Sep 17 00:00:00 2001 +From: Matthias Reichl <hias@horus.com> +Date: Sun, 11 Oct 2015 16:44:05 +0200 +Subject: [PATCH 014/127] bcm2835-i2s: get base address for DMA from devicetree + +Code copied from spi-bcm2835. Get physical address from devicetree +instead of using hardcoded constant. + +Signed-off-by: Matthias Reichl <hias@horus.com> +--- + sound/soc/bcm/bcm2835-i2s.c | 20 ++++++++++++-------- + 1 file changed, 12 insertions(+), 8 deletions(-) + +--- a/sound/soc/bcm/bcm2835-i2s.c ++++ b/sound/soc/bcm/bcm2835-i2s.c +@@ -38,6 +38,7 @@ + #include <linux/delay.h> + #include <linux/io.h> + #include <linux/clk.h> ++#include <linux/of_address.h> + + #include <sound/core.h> + #include <sound/pcm.h> +@@ -158,10 +159,6 @@ static const unsigned int bcm2835_clk_fr + #define BCM2835_I2S_INT_RXR BIT(1) + #define BCM2835_I2S_INT_TXW BIT(0) + +-/* I2S DMA interface */ +-/* FIXME: Needs IOMMU support */ +-#define BCM2835_VCMMU_SHIFT (0x7E000000 - 0x20000000) +- + /* General device struct */ + struct bcm2835_i2s_dev { + struct device *dev; +@@ -791,6 +788,15 @@ static int bcm2835_i2s_probe(struct plat + int ret; + struct regmap *regmap[2]; + struct resource *mem[2]; ++ const __be32 *addr; ++ dma_addr_t dma_reg_base; ++ ++ addr = of_get_address(pdev->dev.of_node, 0, NULL, NULL); ++ if (!addr) { ++ dev_err(&pdev->dev, "could not get DMA-register address\n"); ++ return -ENODEV; ++ } ++ dma_reg_base = be32_to_cpup(addr); + + /* Request both ioareas */ + for (i = 0; i <= 1; i++) { +@@ -817,12 +823,10 @@ static int bcm2835_i2s_probe(struct plat + + /* Set the DMA address */ + dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr = +- (dma_addr_t)mem[0]->start + BCM2835_I2S_FIFO_A_REG +- + BCM2835_VCMMU_SHIFT; ++ dma_reg_base + BCM2835_I2S_FIFO_A_REG; + + dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr = +- (dma_addr_t)mem[0]->start + BCM2835_I2S_FIFO_A_REG +- + BCM2835_VCMMU_SHIFT; ++ dma_reg_base + BCM2835_I2S_FIFO_A_REG; + + /* Set the bus width */ + dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr_width = |