RT5350 I2S audio问题

前面有弄RT5350的wifi开发板做ipcam，本来规划增加audio功能上去。
当时找了官方SDK user manual 看下，RT5350的I2S有预留，但原厂并未有驱动和支持的解码芯片出来。

而后，最近看到openwrt中，有支持WM8960,ES9023芯片。
也参考PI中，有搞定I2S audio功能。
所以我也想试试，淘宝了ES9023。坐等收货试验，openwrt已经build好。

参考链接：
ES9023
http://transing.xyz/2015/07/27/wifi-audio-on-rt5350-with-openwrt/
https://github.com/qdk0901/openwrt-rt5350

WM8960
http://vonger.cn/?p=1970
附上 8960 audio driver code

#include <linux/init.h>
#include <linux/module.h>#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/dma-mapping.h>
#include <linux/sysfs.h>#include <linux/vmalloc.h>#define MAX_BUFF    0x200000struct vocore_data {void __iomem *gdma;void __iomem *i2s;dma_addr_t addr;void *vaddr;u8 *buf;u32 size;       // current data size in buffer.u32 curr;       // current data pointer.
};irqreturn_t vocore_gdma_irq_handler(int irq, void *dev_id)
{struct vocore_data *p = (struct vocore_data *)dev_get_drvdata(dev_id);u32 mask, done;mask = readl(p->gdma + 0x0200);done = readl(p->gdma + 0x0204);// MASK, DONE their register type is W1C(write one to clean)writel(mask, p->gdma + 0x0200);writel(done, p->gdma + 0x0204);memcpy(p->vaddr, p->buf + p->curr, PAGE_SIZE);p->curr += PAGE_SIZE;if(p->curr >= p->size)p->curr = 0;// must fill the address again, or it will send some "random" data.writel(p->addr, p->gdma + 0x0020);writel(0x10000A10, p->gdma + 0x0024);writel(0x10000046, p->gdma + 0x0028);return IRQ_HANDLED;
}// input format must be 44.1KHz, 16bits, stereo pcm data, max data size is 2MB
static ssize_t vocore_gdma_data_store(struct device *dev,struct device_attribute *attr, const char *buf, size_t count)
{struct vocore_data *p = (struct vocore_data *)dev_get_drvdata(dev);if(p->buf == NULL)p->buf = (u8 *)vmalloc(MAX_BUFF);   // 2MB bufferif(p->size + count > MAX_BUFF) {printk("buffer has full = %d.\n", p->size);return count;}memcpy(p->buf + p->size, buf, count);p->size += count;return count;
}static ssize_t vocore_gdma_play_store(struct device *dev,struct device_attribute *attr, const char *buf, size_t count)
{struct vocore_data *p = (struct vocore_data *)dev_get_drvdata(dev);switch(buf[0]) {case '0': {     // stopwritel(0x00000044, p->gdma + 0x0028);writel(0x00004040, p->i2s + 0x0000);p->size = 0; // clean buffer.printk("vocore_gdma_play_store: stop!\n");break; }case '1': {     // startif(p->size < PAGE_SIZE) {printk("not enough data, can not start.\n");break;}memcpy(p->vaddr, p->buf, PAGE_SIZE);p->curr = PAGE_SIZE;// setup i2swritel(0x80000058, p->i2s + 0x0020);writel(0x0000000E, p->i2s + 0x0024);writel(0xC1004040, p->i2s + 0x0000);// start dma transferwritel(p->addr, p->gdma + 0x0020);writel(0x10000A10, p->gdma + 0x0024);writel(0x00200210, p->gdma + 0x002c);writel(0x10000046, p->gdma + 0x0028);printk("vocore_gdma_play_store: start!\n");break; }}return count;
}static DEVICE_ATTR(data, S_IWUSR, NULL, vocore_gdma_data_store);
static DEVICE_ATTR(play, S_IWUSR, NULL, vocore_gdma_play_store);static int vocore_gdma_probe(struct platform_device* dev)
{int irq, r;struct resource *res;struct vocore_data *p;p = (struct vocore_data *)kmalloc(sizeof(struct vocore_data), GFP_KERNEL);memset(p, 0, sizeof(struct vocore_data));platform_set_drvdata(dev, p);irq = platform_get_irq(dev, 0);printk("platform_get_irq %d\n", irq);r = request_irq(irq, vocore_gdma_irq_handler, IRQF_SHARED, "vocore-gdma", &dev->dev);if(r < 0) {printk("request_irq failed %d.\n", r);return 0;}printk("request_irq %d success.\n", irq);res = platform_get_resource(dev, IORESOURCE_MEM, 0);p->gdma = devm_ioremap_resource(&dev->dev, res);p->i2s = p->gdma - 0x00002800 + 0x00000a00;p->vaddr = dma_alloc_coherent(&dev->dev, PAGE_SIZE, &p->addr, GFP_DMA);printk("virtual address: %p, physics address: %p\n", p->vaddr, (void *)p->addr);device_create_file(&dev->dev, &dev_attr_data);device_create_file(&dev->dev, &dev_attr_play);return 0;
}static int vocore_gdma_remove(struct platform_device* dev)
{struct vocore_data *p = (struct vocore_data *)platform_get_drvdata(dev);int irq = platform_get_irq(dev, 0);free_irq(irq, &dev->dev);printk("free_irq %d done.\n", irq);dma_free_coherent(&dev->dev, PAGE_SIZE, p->vaddr, p->addr);printk("free virtual address: %p, physics address: %p\n", p->vaddr, (void *)p->addr);if(p->buf)vfree(p->buf);kfree(p);device_remove_file(&dev->dev, &dev_attr_data);device_remove_file(&dev->dev, &dev_attr_play);return 0;
}static const struct of_device_id gdma_rt_dt_ids[] = {{ .compatible = "ralink,rt2880-gdma", },{ }
};static struct platform_driver rt_gdma_driver = {.probe = vocore_gdma_probe,.remove = vocore_gdma_remove,.driver = {.owner = THIS_MODULE,.name = "ralink-gdma",.of_match_table = gdma_rt_dt_ids,},
};static int vocore_gdma_init(void)
{printk("vocore_gdma_init\n");return platform_driver_register(&rt_gdma_driver);
}static void vocore_gdma_exit(void)
{platform_driver_unregister(&rt_gdma_driver);printk("vocore_gdma_exit\n");
}module_init(vocore_gdma_init);
module_exit(vocore_gdma_exit);MODULE_AUTHOR("Qin Wei <me@vonger.cn>");
MODULE_DESCRIPTION("VoCore Test GDMA&I2S driver");
MODULE_LICENSE("GPL");

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