2b1c6b21b5
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also adds support for Raspberry Pi Compute Module 3 (untested). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
66 lines
2.0 KiB
Diff
66 lines
2.0 KiB
Diff
From 17025015a60ffc92d09ade98131ed080bbf09106 Mon Sep 17 00:00:00 2001
|
|
From: Matthias Reichl <hias@horus.com>
|
|
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 <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 =
|