From fba1570f5f2fa5a65e933db49d3fc36126561a15 Mon Sep 17 00:00:00 2001 From: Matthias Reichl Date: Sun, 11 Oct 2015 16:44:05 +0200 Subject: [PATCH] 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 --- 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 #include #include +#include #include #include @@ -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 =