最近做了博创2410开发板上uda1341的驱动,从网上下了一些源代码,直接拿过来在2.6.24上行不通。然后就自己去看内核中和dma相关的代码,最终把驱动弄好了,能顺利播放音乐了。把移植过程介绍一下,供大家参考。
遇到的第一个问题是dma通道的映射问题。
通道映射不正确的话,uda1341就没有输出。这个问题我觉得是移植过程中解决的主要问题。关于2.6.24中dma的基本建立过程在我的另一篇文章中有介绍,大家可以看一下:
http://blog.chinaunix.net/u1/57747/showart_718784.html
然后直接介绍移植过程中需要修改的地方。首先还是dma通道的问题。在内核的arch/arm/plat-s3c24xx/dma.c的s3c2410_dma_map_channel函数中修改如下:
static struct s3c2410_dma_chan *s3c2410_dma_map_channel(int channel)
{ struct s3c24xx_dma_order_ch *ord = NULL; struct s3c24xx_dma_map *ch_map; struct s3c2410_dma_chan *dmach; int ch;
if (dma_sel.map == NULL || channel > dma_sel.map_size)
return NULL;
ch_map = dma_sel.map + channel;
/* first, try the board mapping */
#if 0 //这里 if (dma_order) { ord = &dma_order->channels[channel];
for (ch = 0; ch < dma_channels; ch++) {
if (!is_channel_valid(ord->list[ch])) continue;
if (s3c2410_chans[ord->list[ch]].in_use == 0) {
ch = ord->list[ch] & ~DMA_CH_VALID; goto found; } }
if (ord->flags & DMA_CH_NEVER)
return NULL; } #endif //这里 /* second, search the channel map for first free */ 就是注释掉一段代码就行了。
然后,还是同一个文件中,修改这个函数:s3c2410_dma_enqueue
这个函数的结尾:
} else if (chan->state == S3C2410_DMA_IDLE) {
if (chan->flags & S3C2410_DMAF_AUTOSTART) { s3c2410_dma_ctrl(channel, S3C2410_DMAOP_START); //修改的只有这一行 } }
local_irq_restore(flags);
return 0; }
上面注释的那行,把第一个参数chan->number,换成了现在的channel。
ok,这个文件就改这些。
下面贴出uda1341.c这个文件:
#include <linux/module.h>
#include <linux/device.h> #include <linux/init.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/sched.h> #include <linux/poll.h> #include <linux/interrupt.h> #include <linux/errno.h> #include <linux/sound.h> #include <linux/soundcard.h> #include <linux/clk.h> #include <linux/platform_device.h>
#include <linux/pm.h>
#include <asm/uaccess.h> #include <asm/io.h> #include <asm/hardware.h> #include <asm/semaphore.h> #include <asm/dma.h> #include <asm/arch/dma.h> #include <asm/arch/regs-gpio.h> #include <asm-arm/plat-s3c24xx/regs-iis.h> #include <asm-arm/plat-s3c24xx/clock.h> #include <asm/arch/regs-clock.h> #include <linux/dma-mapping.h> #include <asm/dma-mapping.h> #include <asm/arch/hardware.h> #include <asm/arch/map.h>
#define DMA_BUF_WR 1
#define DMA_BUF_RD 0
#define DMA_CH1 DMACH_I2S_IN
#define DMA_CH2 DMACH_I2S_OUT
static struct clk *iis_clock;
static void __iomem *iis_base;
static struct s3c2410_dma_client s3c2410iis_dma_out= {
.name = "I2SSDO", };
static struct s3c2410_dma_client s3c2410iis_dma_in = {
.name = "I2SSDI", };
static void init_s3c2410_iis_bus(void);
#define DEF_VOLUME 65
/* UDA1341 Register bits */
#define UDA1341_ADDR 0x14
#define UDA1341_REG_DATA0 (UDA1341_ADDR + 0)
#define UDA1341_REG_STATUS (UDA1341_ADDR + 2)
/* status control */
#define STAT0 (0x00) #define STAT0_RST (1 << 6) #define STAT0_SC_MASK (3 << 4) #define STAT0_SC_512FS (0 << 4) #define STAT0_SC_384FS (1 << 4) #define STAT0_SC_256FS (2 << 4) #define STAT0_IF_MASK (7 << 1) #define STAT0_IF_I2S (0 << 1) #define STAT0_IF_LSB16 (1 << 1) #define STAT0_IF_LSB18 (2 << 1) #define STAT0_IF_LSB20 (3 << 1) #define STAT0_IF_MSB (4 << 1) #define STAT0_IF_LSB16MSB (5 << 1) #define STAT0_IF_LSB18MSB (6 << 1) #define STAT0_IF_LSB20MSB (7 << 1) #define STAT0_DC_FILTER (1 << 0) #define STAT0_DC_NO_FILTER (0 << 0)
#define STAT1 (0x80)
#define STAT1_DAC_GAIN (1 << 6) /* gain of DAC */ #define STAT1_ADC_GAIN (1 << 5) /* gain of ADC */ #define STAT1_ADC_POL (1 << 4) /* polarity of ADC */ #define STAT1_DAC_POL (1 << 3) /* polarity of DAC */ #define STAT1_DBL_SPD (1 << 2) /* double speed playback */ #define STAT1_ADC_ON (1 << 1) /* ADC powered */ #define STAT1_DAC_ON (1 << 0) /* DAC powered */
/* data0 direct control */
#define DATA0 (0x00) #define DATA0_VOLUME_MASK (0x3f) #define DATA0_VOLUME(x) (x)
#define DATA1 (0x40)
#define DATA1_BASS(x) ((x) << 2) #define DATA1_BASS_MASK (15 << 2) #define DATA1_TREBLE(x) ((x)) #define DATA1_TREBLE_MASK (3)
#define DATA2 (0x80)
#define DATA2_PEAKAFTER (0x1 << 5) #define DATA2_DEEMP_NONE (0x0 << 3) #define DATA2_DEEMP_32KHz (0x1 << 3) #define DATA2_DEEMP_44KHz (0x2 << 3) #define DATA2_DEEMP_48KHz (0x3 << 3) #define DATA2_MUTE (0x1 << 2) #define DATA2_FILTER_FLAT (0x0 << 0) #define DATA2_FILTER_MIN (0x1 << 0) #define DATA2_FILTER_MAX (0x3 << 0) /* data0 extend control */ #define EXTADDR(n) (0xc0 | (n)) #define EXTDATA(d) (0xe0 | (d))
#define EXT0 0
#define EXT0_CH1_GAIN(x) (x) #define EXT1 1 #define EXT1_CH2_GAIN(x) (x) #define EXT2 2 #define EXT2_MIC_GAIN_MASK (7 << 2) #define EXT2_MIC_GAIN(x) ((x) << 2) #define EXT2_MIXMODE_DOUBLEDIFF (0) #define EXT2_MIXMODE_CH1 (1) #define EXT2_MIXMODE_CH2 (2) #define EXT2_MIXMODE_MIX (3) #define EXT4 4 #define EXT4_AGC_ENABLE (1 << 4) #define EXT4_INPUT_GAIN_MASK (3) #define EXT4_INPUT_GAIN(x) ((x) & 3) #define EXT5 5 #define EXT5_INPUT_GAIN(x) ((x) >> 2) #define EXT6 6 #define EXT6_AGC_CONSTANT_MASK (7 << 2) #define EXT6_AGC_CONSTANT(x) ((x) << 2) #define EXT6_AGC_LEVEL_MASK (3) #define EXT6_AGC_LEVEL(x) (x)
#define AUDIO_NAME "UDA1341"
#define AUDIO_NAME_VERBOSE "UDA1341 audio driver"
#define AUDIO_FMT_MASK (AFMT_S16_LE)
#define AUDIO_FMT_DEFAULT (AFMT_S16_LE)
#define AUDIO_CHANNELS_DEFAULT 2
#define AUDIO_RATE_DEFAULT 8000
#define AUDIO_NBFRAGS_DEFAULT 8
#define AUDIO_FRAGSIZE_DEFAULT 8192
#define S_CLOCK_FREQ 384
typedef struct { int size; /* buffer size */ char *start; /* point to actual buffer */ dma_addr_t dma_addr; /* physical buffer address */ struct semaphore sem; /* down before touching the buffer */ int master; /* owner for buffer allocation, contain size when true */ } audio_buf_t;
typedef struct {
audio_buf_t *buffers; /* pointer to audio buffer structures */ audio_buf_t *buf; /* current buffer used by read/write */ u_int buf_idx; /* index for the pointer above */ u_int fragsize; /* fragment i.e. buffer size */ u_int nbfrags; /* nbr of fragments */ enum dma_ch dmach; } audio_stream_t;
static audio_stream_t output_stream;
static audio_stream_t input_stream;
#define NEXT_BUF(_s_,_b_) { /
(_s_)->_b_##_idx++; / (_s_)->_b_##_idx %= (_s_)->nbfrags; / (_s_)->_b_ = (_s_)->buffers + (_s_)->_b_##_idx; }
static u_int audio_rate;
static int audio_channels; static int audio_fmt; static u_int audio_fragsize; static u_int audio_nbfrags; static int audio_rd_refcount; static int audio_wr_refcount; #define audio_active (audio_rd_refcount | audio_wr_refcount)
static int audio_dev_dsp;
static int audio_dev_mixer; static int audio_mix_modcnt;
static int uda1341_volume;
static u8 uda_sampling; static int uda1341_boost; static int mixer_igain=0x4; /* -6db*/
static void uda1341_l3_address(u8 data)
{ int i; unsigned long flags; local_irq_save(flags); s3c2410_gpio_setpin(S3C2410_GPG9,1); s3c2410_gpio_setpin(S3C2410_GPG0,0); udelay(10); s3c2410_gpio_setpin(S3C2410_GPG8,0); udelay(5); for (i = 0; i < 8; i++) { if (data & 0x1) { s3c2410_gpio_setpin(S3C2410_GPG9,0); s3c2410_gpio_setpin(S3C2410_GPG0,1); udelay(1); s3c2410_gpio_setpin(S3C2410_GPG9,1); udelay(1); } else { s3c2410_gpio_setpin(S3C2410_GPG9,0); s3c2410_gpio_setpin(S3C2410_GPG0,0); udelay(1); s3c2410_gpio_setpin(S3C2410_GPG9,1); udelay(1); } data >>= 1; } udelay(5); s3c2410_gpio_setpin(S3C2410_GPG8,1); udelay(1); local_irq_restore(flags); }
static void uda1341_l3_data(u8 data)
{ int i; unsigned long flags;
local_irq_save(flags);
s3c2410_gpio_setpin(S3C2410_GPG8,1); udelay(5); for (i = 0; i < 8; i++) { if (data & 0x1) { s3c2410_gpio_setpin(S3C2410_GPG9,0); s3c2410_gpio_setpin(S3C2410_GPG0,1); udelay(1); s3c2410_gpio_setpin(S3C2410_GPG9,1); udelay(1); } else { s3c2410_gpio_setpin(S3C2410_GPG9,0); s3c2410_gpio_setpin(S3C2410_GPG0,0); udelay(1); s3c2410_gpio_setpin(S3C2410_GPG9,1); udelay(1); } data >>= 1; } udelay(1); s3c2410_gpio_setpin(S3C2410_GPG8, 0); udelay(2); s3c2410_gpio_setpin(S3C2410_GPG8, 1); local_irq_restore(flags); }
static void audio_clear_buf(audio_stream_t * s)
{ s3c2410_dma_ctrl(s->dmach, S3C2410_DMAOP_FLUSH); if (s->buffers) { int frag; for (frag = 0; frag < s->nbfrags; frag++) { if (!s->buffers[frag].master) continue; dma_free_coherent(NULL, s->buffers[frag].master, s->buffers[frag].start, s->buffers[frag].dma_addr); } kfree(s->buffers); s->buffers = NULL; } s->buf_idx = 0; s->buf = NULL; }
static int audio_setup_buf(audio_stream_t * s)
{ int frag; int dmasize = 0; char *dmabuf = 0; dma_addr_t dmaphys = 0; if (s->buffers) return -EBUSY; s->nbfrags = audio_nbfrags; s->fragsize = audio_fragsize; s->buffers = (audio_buf_t *) kmalloc(sizeof(audio_buf_t) * s->nbfrags, GFP_KERNEL); if (!s->buffers) goto err; memset(s->buffers, 0, sizeof(audio_buf_t) * s->nbfrags); for (frag = 0; frag < s->nbfrags; frag++) { audio_buf_t *b = &s->buffers[frag]; if (!dmasize) { dmasize = (s->nbfrags - frag) * s->fragsize; do { dmabuf = dma_alloc_coherent(NULL, dmasize, &dmaphys, GFP_KERNEL|GFP_DMA); if (!dmabuf) dmasize -= s->fragsize; } while (!dmabuf && dmasize); if (!dmabuf) goto err; b->master = dmasize; } b->start = dmabuf; b->dma_addr = dmaphys; sema_init(&b->sem, 1); dmabuf += s->fragsize; dmaphys += s->fragsize; dmasize -= s->fragsize; } s->buf_idx = 0; s->buf = &s->buffers[0]; return 0; err: printk(AUDIO_NAME ": unable to allocate audio memory/n "); audio_clear_buf(s); return -ENOMEM; }
static void audio_dmaout_done_callback(struct s3c2410_dma_chan *ch, void *buf, int size,enum s3c2410_dma_buffresult result)
{ audio_buf_t *b = (audio_buf_t *) buf; up(&b->sem); wake_up(&b->sem.wait); }
static void audio_dmain_done_callback(struct s3c2410_dma_chan *ch, void *buf, int size,enum s3c2410_dma_buffresult result)
{ audio_buf_t *b = (audio_buf_t *) buf; b->size = size; up(&b->sem); wake_up(&b->sem.wait); } /* using when write */ static int audio_sync(struct file *file) { audio_stream_t *s = &output_stream; audio_buf_t *b = s->buf; printk("audio_sync/n"); if (!s->buffers) return 0; if (b->size != 0) { down(&b->sem); s3c2410_dma_enqueue(s->dmach, (void *) b, b->dma_addr, b->size); b->size = 0; NEXT_BUF(s, buf); } b = s->buffers + ((s->nbfrags + s->buf_idx - 1) % s->nbfrags); if (down_interruptible(&b->sem)) return -EINTR; up(&b->sem); return 0; }
static inline int copy_from_user_mono_stereo(char *to, const char *from, int count)
{ u_int *dst = (u_int *)to; const char *end = from + count; if (!access_ok(VERIFY_READ, from, count)) return -EFAULT; if ((int)from & 0x2) { u_int v; __get_user(v, (const u_short *)from); from += 2; *dst++ = v | (v << 16); } while (from < end-2) { u_int v, x, y; __get_user(v, (const u_int *)from); from += 4; x = v << 16; x |= x >> 16; y = v >> 16; y |= y << 16; *dst++ = x; *dst++ = y; } if (from < end) { u_int v; __get_user(v, (const u_short *)from); *dst = v | (v << 16); } return 0; }
static ssize_t smdk2410_audio_write(struct file *file, const char *buffer,
size_t count, loff_t * ppos) { const char *buffer0 = buffer; audio_stream_t *s = &output_stream; int chunksize, ret = 0;
switch (file->f_flags & O_ACCMODE) {
case O_WRONLY: case O_RDWR: break; default: return -EPERM; }
if (!s->buffers && audio_setup_buf(s))
return -ENOMEM;
count &= ~0x03;
while (count > 0) {
audio_buf_t *b = s->buf;
if (file->f_flags & O_NONBLOCK) {
ret = -EAGAIN; if (down_trylock(&b->sem)) break; } else { ret = -ERESTARTSYS; if (down_interruptible(&b->sem)) break; }
if (audio_channels == 2) {
chunksize = s->fragsize - b->size; if (chunksize > count) chunksize = count; if (copy_from_user(b->start + b->size, buffer, chunksize)) { up(&b->sem); return -EFAULT; } b->size += chunksize; } else { chunksize = (s->fragsize - b->size) >> 1;
if (chunksize > count)
chunksize = count; if (copy_from_user_mono_stereo(b->start + b->size, buffer, chunksize)) { up(&b->sem); return -EFAULT; }
b->size += chunksize*2;
}
buffer += chunksize;
count -= chunksize; if (b->size < s->fragsize) { up(&b->sem); break; } ret = s3c2410_dma_enqueue(s->dmach, (void *)b, b->dma_addr, b->size);
if(ret) {
printk("dma enqueue failed./n"); return ret; } b->size = 0; NEXT_BUF(s, buf); }
if ((buffer - buffer0))
ret = buffer - buffer0;
return ret;
} static ssize_t smdk2410_audio_read(struct file *file, char *buffer, size_t count, loff_t * ppos) { const char *buffer0 = buffer; audio_stream_t *s = &input_stream; int chunksize, ret = 0; printk("audio_read: count=%d/n", count); if (ppos != &file->f_pos) return -ESPIPE; if (!s->buffers) { int i; if (audio_setup_buf(s)) return -ENOMEM; for (i = 0; i < s->nbfrags; i++) { audio_buf_t *b = s->buf; down(&b->sem); s3c2410_dma_enqueue(s->dmach, (void *) b, b->dma_addr, s->fragsize); NEXT_BUF(s, buf); } } while (count > 0) { audio_buf_t *b = s->buf; /* Wait for a buffer to become full */ if (file->f_flags & O_NONBLOCK) { ret = -EAGAIN; if (down_trylock(&b->sem)) break; } else { ret = -ERESTARTSYS; if (down_interruptible(&b->sem)) break; } chunksize = b->size; if (chunksize > count) chunksize = count; if (copy_to_user(buffer, b->start + s->fragsize - b->size, chunksize)) { up(&b->sem); return -EFAULT; } b->size -= chunksize; buffer += chunksize; count -= chunksize; if (b->size > 0) { up(&b->sem); break; } /* Make current buffer available for DMA again */ s3c2410_dma_enqueue(s->dmach, (void *) b, b->dma_addr, s->fragsize); NEXT_BUF(s, buf); } if ((buffer - buffer0)) ret = buffer - buffer0; printk("audio_read: return=%d/n", ret); return ret; } static unsigned int smdk2410_audio_poll(struct file *file, struct poll_table_struct *wait) { unsigned int mask = 0; int i; printk("audio_poll(): mode=%s/n", (file->f_mode & FMODE_WRITE) ? "w" : ""); if (file->f_mode & FMODE_READ) { if (!input_stream.buffers && audio_setup_buf(&input_stream)) return -ENOMEM; poll_wait(file, &input_stream.buf->sem.wait, wait); for (i = 0; i < input_stream.nbfrags; i++) { if (atomic_read(&input_stream.buffers[i].sem.count) > 0) mask |= POLLIN | POLLWRNORM; break; } } if (file->f_mode & FMODE_WRITE) { if (!output_stream.buffers && audio_setup_buf(&output_stream)) return -ENOMEM; poll_wait(file, &output_stream.buf->sem.wait, wait); for (i = 0; i < output_stream.nbfrags; i++) { if (atomic_read(&output_stream.buffers[i].sem.count) > 0) mask |= POLLOUT | POLLWRNORM; break; } }
return mask;
} static loff_t smdk2410_audio_llseek(struct file *file, loff_t offset, int origin) { return -ESPIPE; } static int smdk2410_mixer_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { int ret; long val = 0; switch (cmd) { case SOUND_MIXER_INFO: { mixer_info info; strncpy(info.id, "UDA1341", sizeof(info.id)); strncpy(info.name,"Philips UDA1341", sizeof(info.name)); info.modify_counter = audio_mix_modcnt; return copy_to_user((void *)arg, &info, sizeof(info)); } case SOUND_OLD_MIXER_INFO: { _old_mixer_info info; strncpy(info.id, "UDA1341", sizeof(info.id)); strncpy(info.name,"Philips UDA1341", sizeof(info.name)); return copy_to_user((void *)arg, &info, sizeof(info)); } case SOUND_MIXER_READ_STEREODEVS: return put_user(0, (long *) arg); case SOUND_MIXER_READ_CAPS: val = SOUND_CAP_EXCL_INPUT; return put_user(val, (long *) arg); case SOUND_MIXER_WRITE_VOLUME: ret = get_user(val, (long *) arg); if (ret) return ret; uda1341_volume = 63 - (((val & 0xff) + 1) * 63) / 100; uda1341_l3_address(UDA1341_REG_DATA0); uda1341_l3_data(uda1341_volume); break; case SOUND_MIXER_READ_VOLUME: val = ((63 - uda1341_volume) * 100) / 63; val |= val << 8; return put_user(val, (long *) arg); case SOUND_MIXER_READ_IGAIN: val = ((31- mixer_igain) * 100) / 31; return put_user(val, (int *) arg); case SOUND_MIXER_WRITE_IGAIN: ret = get_user(val, (int *) arg); if (ret) return ret; mixer_igain = 31 - (val * 31 / 100); /* use mixer gain channel 1*/ uda1341_l3_address(UDA1341_REG_DATA0); uda1341_l3_data(EXTADDR(EXT0)); uda1341_l3_data(EXTDATA(EXT0_CH1_GAIN(mixer_igain))); break; default: return -ENOSYS; } audio_mix_modcnt++; return 0; }
static int iispsr_value(int s_bit_clock, int sample_rate)
{ unsigned int i,j,prescaler = 0; i = s_bit_clock*sample_rate;
prescaler = clk_get_rate(iis_clock)/i;
j = clk_get_rate(iis_clock)%i;
if(j<(i/2))
return (prescaler - 1); return prescaler; }
static int audio_set_dsp_speed(long val)
{ unsigned long iispsr = 0; unsigned long value = 0;
value = iispsr_value(S_CLOCK_FREQ, val);
iispsr = (value<<5)|value; writel(iispsr, iis_base + S3C2410_IISPSR); iispsr = readl(iis_base + S3C2410_IISPSR); return (audio_rate = val); }
static int smdk2410_audio_ioctl(struct inode *inode, struct file *file,
uint cmd, ulong arg) { long val;
switch (cmd) {
case SNDCTL_DSP_SETFMT: get_user(val, (long *) arg); if (val & AUDIO_FMT_MASK) { audio_fmt = val; break; } else return -EINVAL;
case SNDCTL_DSP_CHANNELS:
case SNDCTL_DSP_STEREO: get_user(val, (long *) arg); if (cmd == SNDCTL_DSP_STEREO) val = val ? 2 : 1; if (val != 1 && val != 2) return -EINVAL; audio_channels = val; break;
case SOUND_PCM_READ_CHANNELS:
put_user(audio_channels, (long *) arg); break;
case SNDCTL_DSP_SPEED:
get_user(val, (long *) arg); val = audio_set_dsp_speed(val); if (val < 0) return -EINVAL; put_user(val, (long *) arg); break;
case SOUND_PCM_READ_RATE:
put_user(audio_rate, (long *) arg); break;
case SNDCTL_DSP_GETFMTS:
put_user(AUDIO_FMT_MASK, (long *) arg); break;
case SNDCTL_DSP_GETBLKSIZE:
if(file->f_mode & FMODE_WRITE) return put_user(audio_fragsize, (long *) arg); else return put_user(audio_fragsize, (int *) arg);
case SNDCTL_DSP_SETFRAGMENT:
if (file->f_mode & FMODE_WRITE) { if (output_stream.buffers) return -EBUSY; get_user(val, (long *) arg); audio_fragsize = 1 << (val & 0xFFFF); if (audio_fragsize < 16) audio_fragsize = 16; if (audio_fragsize > 16384) audio_fragsize = 16384; audio_nbfrags = (val >> 16) & 0x7FFF; if (audio_nbfrags < 2) audio_nbfrags = 2; if (audio_nbfrags * audio_fragsize > 128 * 1024) audio_nbfrags = 128 * 1024 / audio_fragsize; if (audio_setup_buf(&output_stream)) return -ENOMEM;
}
if (file->f_mode & FMODE_READ) { if (input_stream.buffers) return -EBUSY; get_user(val, (int *) arg); audio_fragsize = 1 << (val & 0xFFFF); if (audio_fragsize < 16) audio_fragsize = 16; if (audio_fragsize > 16384) audio_fragsize = 16384; audio_nbfrags = (val >> 16) & 0x7FFF; if (audio_nbfrags < 2) audio_nbfrags = 2; if (audio_nbfrags * audio_fragsize > 128 * 1024) audio_nbfrags = 128 * 1024 / audio_fragsize; if (audio_setup_buf(&input_stream)) return -ENOMEM;
}
break;
case SNDCTL_DSP_SYNC:
return audio_sync(file);
case SNDCTL_DSP_GETOSPACE:
{ audio_stream_t *s = &output_stream; audio_buf_info *inf = (audio_buf_info *) arg; int err = access_ok(VERIFY_WRITE, inf, sizeof(*inf)); int i; int frags = 0, bytes = 0;
if (err)
return err; for (i = 0; i < s->nbfrags; i++) { if (atomic_read(&s->buffers[i].sem.count) > 0) { if (s->buffers[i].size == 0) frags++; bytes += s->fragsize - s->buffers[i].size; } } put_user(frags, &inf->fragments); put_user(s->nbfrags, &inf->fragstotal); put_user(s->fragsize, &inf->fragsize); put_user(bytes, &inf->bytes); break; }
case SNDCTL_DSP_GETISPACE:
{ audio_stream_t *s = &input_stream; audio_buf_info *inf = (audio_buf_info *) arg; int err = access_ok(VERIFY_WRITE, inf, sizeof(*inf)); int i; int frags = 0, bytes = 0;
if (!(file->f_mode & FMODE_READ))
return -EINVAL;
if (err)
return err; for(i = 0; i < s->nbfrags; i++){ if (atomic_read(&s->buffers[i].sem.count) > 0) { if (s->buffers[i].size == s->fragsize) frags++; bytes += s->buffers[i].size; } } put_user(frags, &inf->fragments); put_user(s->nbfrags, &inf->fragstotal); put_user(s->fragsize, &inf->fragsize); put_user(bytes, &inf->bytes); break; } case SNDCTL_DSP_RESET: if (file->f_mode & FMODE_READ) { audio_clear_buf(&input_stream); } if (file->f_mode & FMODE_WRITE) { audio_clear_buf(&output_stream); } return 0; case SNDCTL_DSP_NONBLOCK: file->f_flags |= O_NONBLOCK; return 0; case SNDCTL_DSP_POST: case SNDCTL_DSP_SUBDIVIDE: case SNDCTL_DSP_GETCAPS: case SNDCTL_DSP_GETTRIGGER: case SNDCTL_DSP_SETTRIGGER: case SNDCTL_DSP_GETIPTR: case SNDCTL_DSP_GETOPTR: case SNDCTL_DSP_MAPINBUF: case SNDCTL_DSP_MAPOUTBUF: case SNDCTL_DSP_SETSYNCRO: case SNDCTL_DSP_SETDUPLEX: return -ENOSYS; default: return smdk2410_mixer_ioctl(inode, file, cmd, arg); }
return 0;
} static int smdk2410_audio_open(struct inode *inode, struct file *file) { int cold = !audio_active; printk("audio open/n");
if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
if (audio_rd_refcount || audio_wr_refcount) return -EBUSY; audio_rd_refcount++; } else if ((file->f_flags & O_ACCMODE) == O_WRONLY) { if (audio_wr_refcount) return -EBUSY; audio_wr_refcount++; } else if ((file->f_flags & O_ACCMODE) == O_RDWR) { if (audio_rd_refcount || audio_wr_refcount) return -EBUSY; audio_rd_refcount++; audio_wr_refcount++; } else return -EINVAL; if (cold) { audio_rate = AUDIO_RATE_DEFAULT; audio_channels = AUDIO_CHANNELS_DEFAULT; audio_fragsize = AUDIO_FRAGSIZE_DEFAULT; audio_nbfrags = AUDIO_NBFRAGS_DEFAULT; init_s3c2410_iis_bus(); if ((file->f_mode & FMODE_WRITE)){ audio_clear_buf(&output_stream); } if ((file->f_mode & FMODE_READ)) audio_clear_buf(&input_stream); } return 0; } static int smdk2410_mixer_open(struct inode *inode, struct file *file) { return 0; } static int smdk2410_audio_release(struct inode *inode, struct file *file) {
if (file->f_mode & FMODE_READ) {
if (audio_rd_refcount == 1) audio_clear_buf(&input_stream); audio_rd_refcount = 0; } if(file->f_mode & FMODE_WRITE) { if (audio_wr_refcount == 1) { audio_sync(file); audio_clear_buf(&output_stream); audio_wr_refcount = 0; } } return 0; } static int smdk2410_mixer_release(struct inode *inode, struct file *file) { return 0; } static struct file_operations smdk2410_audio_fops = { .llseek = smdk2410_audio_llseek, .write = smdk2410_audio_write, .read = smdk2410_audio_read, .poll = smdk2410_audio_poll, .ioctl = smdk2410_audio_ioctl, .open = smdk2410_audio_open, .release = smdk2410_audio_release };
static struct file_operations smdk2410_mixer_fops = {
.ioctl = smdk2410_mixer_ioctl, .open = smdk2410_mixer_open, .release = smdk2410_mixer_release };
static void init_uda1341(void)
{ unsigned long flags; uda1341_volume = 62 - ((DEF_VOLUME * 61) / 100); uda1341_boost = 0; uda_sampling = DATA2_DEEMP_NONE; uda_sampling &= ~(DATA2_MUTE);
local_irq_save(flags);
s3c2410_gpio_setpin(S3C2410_GPG9, 1); s3c2410_gpio_setpin(S3C2410_GPG8, 1); local_irq_restore(flags);
uda1341_l3_address(UDA1341_REG_STATUS);
uda1341_l3_data(STAT0_RST); uda1341_l3_address(UDA1341_REG_STATUS); uda1341_l3_data(STAT0_SC_384FS | STAT0_IF_MSB | STAT0_DC_FILTER); uda1341_l3_data(STAT1 | STAT1_DAC_GAIN | STAT1_ADC_GAIN | STAT1_ADC_ON | STAT1_DAC_ON);
uda1341_l3_address(UDA1341_REG_DATA0);
uda1341_l3_data(DATA0 |DATA0_VOLUME(uda1341_volume)); uda1341_l3_data(DATA1 |DATA1_BASS(uda1341_boost)| DATA1_TREBLE(0)); uda1341_l3_data(DATA2 |uda_sampling); uda1341_l3_data(EXTADDR(EXT2)); uda1341_l3_data(EXTDATA(EXT2_MIC_GAIN(0x6)| EXT2_MIXMODE_CH2)); uda1341_l3_data(EXTADDR(EXT5)); uda1341_l3_data(EXTDATA(0x7));
local_irq_save(flags);
s3c2410_gpio_setpin(S3C2410_GPG9, 1); s3c2410_gpio_setpin(S3C2410_GPG8, 0); local_irq_restore(flags); }
static void init_s3c2410_iis_bus(void){
unsigned long iiscon, iismod, iisfcon; clk_enable(iis_clock); iiscon = iismod = iisfcon = 0;
iiscon |= S3C2410_IISCON_PSCEN; // Enable prescaler
iiscon |= S3C2410_IISCON_IISEN; // Enable interface iiscon |= S3C2410_IISCON_RXDMAEN; //Enable RX DMA service request iiscon |= S3C2410_IISCON_TXDMAEN; //Enable TX DMA service request iismod |= S3C2410_IISMOD_LR_LLOW; // Low for left channel iismod |= S3C2410_IISMOD_MSB; iismod |= S3C2410_IISMOD_16BIT; // Serial data bit/channel is 16 bit iismod |= S3C2410_IISMOD_384FS; // Master clock freq = 384 fs iismod |= S3C2410_IISMOD_TXRXMODE; //Set RX Mode iismod |= S3C2410_IISMOD_32FS; // 32 fs iisfcon|= S3C2410_IISFCON_RXDMA; //Set RX FIFO acces mode to DMA iisfcon|= S3C2410_IISFCON_RXENABLE; //Enable RX Fifo iisfcon|= S3C2410_IISFCON_TXDMA; //Set RX FIFO acces mode to DMA iisfcon|= S3C2410_IISFCON_TXENABLE;
audio_set_dsp_speed(44100);
writel(iismod, iis_base + S3C2410_IISMOD); writel(iisfcon, iis_base + S3C2410_IISFCON); writel(iiscon, iis_base + S3C2410_IISCON); }
static int __init audio_init_dma(audio_stream_t * s, char *desc)
{ int ret ; enum s3c2410_dmasrc source; int hwcfg; unsigned long devaddr; int dcon; unsigned int flags = 0; if(s->dmach == DMA_CH2){ source = S3C2410_DMASRC_MEM; hwcfg = 3; devaddr = 0x55000010; dcon = 0xa0800000; flags = S3C2410_DMAF_AUTOSTART; ret = s3c2410_dma_request(s->dmach, &s3c2410iis_dma_out, NULL); s3c2410_dma_devconfig(s->dmach, source, hwcfg, devaddr); s3c2410_dma_config(s->dmach, 2, dcon); s3c2410_dma_set_buffdone_fn(s->dmach, audio_dmaout_done_callback); s3c2410_dma_setflags(s->dmach, flags); return ret; } else if(s->dmach == DMA_CH1){ source =S3C2410_DMASRC_HW; hwcfg =3; devaddr = 0x55000010; dcon = 0xa2900000; flags = S3C2410_DMAF_AUTOSTART; ret = s3c2410_dma_request(s->dmach, &s3c2410iis_dma_in, NULL); s3c2410_dma_devconfig(s->dmach, source, hwcfg, devaddr); s3c2410_dma_config(s->dmach, 2, dcon); s3c2410_dma_set_buffdone_fn(s->dmach, audio_dmain_done_callback); s3c2410_dma_setflags(s->dmach, flags); return ret ; } else return 1; }
static int audio_clear_dma(audio_stream_t * s,struct s3c2410_dma_client *client)
{ s3c2410_dma_set_buffdone_fn(s->dmach, NULL); s3c2410_dma_free(s->dmach, client); return 0; }
static int __init s3c2410iis_probe(struct platform_device *pdev) {
struct resource *res; int size; unsigned long flags;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) { printk(KERN_INFO "failed to get memory region resouce/n"); return -ENOENT; } if (!request_mem_region(res->start, 0x20, pdev->name)) { printk(KERN_INFO "failed to get memory region/n"); return -EBUSY; } size = (res->end - res->start) + 1; iis_base = ioremap(res->start, size); if (iis_base == NULL) { printk(KERN_INFO "failed to ioremap() region/n"); return -EINVAL; } iis_clock = clk_get(&pdev->dev, "iis"); if (iis_clock == NULL) { printk(KERN_INFO "failed to find clock source/n"); return -ENOENT; } clk_enable(iis_clock); local_irq_save(flags); /* GPB 4: L3CLOCK, OUTPUT */ s3c2410_gpio_cfgpin(S3C2410_GPG9, S3C2410_GPG9_OUTP); s3c2410_gpio_pullup(S3C2410_GPG9, 1); /* GPB 3: L3DATA, OUTPUT */ s3c2410_gpio_cfgpin(S3C2410_GPG0,S3C2410_GPG0_OUTP); s3c2410_gpio_pullup(S3C2410_GPG0, 1); /* GPB 2: L3MODE, OUTPUT */ s3c2410_gpio_cfgpin(S3C2410_GPG8,S3C2410_GPG8_OUTP); s3c2410_gpio_pullup(S3C2410_GPG8, 1); /* GPE 3: I2SSDI */ s3c2410_gpio_cfgpin(S3C2410_GPE3,S3C2410_GPE3_I2SSDI); s3c2410_gpio_pullup(S3C2410_GPE3, 0); /* GPE 0: I2SLRCK */ s3c2410_gpio_cfgpin(S3C2410_GPE0,S3C2410_GPE0_I2SLRCK); s3c2410_gpio_pullup(S3C2410_GPE0, 0); /* GPE 1: I2SSCLK */ s3c2410_gpio_cfgpin(S3C2410_GPE1,S3C2410_GPE1_I2SSCLK); s3c2410_gpio_pullup(S3C2410_GPE1, 0); /* GPE 2: CDCLK */ s3c2410_gpio_cfgpin(S3C2410_GPE2,S3C2410_GPE2_CDCLK); s3c2410_gpio_pullup(S3C2410_GPE2, 0); /* GPE 4: I2SSDO */ s3c2410_gpio_cfgpin(S3C2410_GPE4,S3C2410_GPE4_I2SSDO); s3c2410_gpio_pullup(S3C2410_GPE4, 0); local_irq_restore(flags); init_uda1341(); output_stream.dmach = DMA_CH2; if (audio_init_dma(&output_stream, "UDA1341 out")) { audio_clear_dma(&output_stream,&s3c2410iis_dma_out); printk( KERN_WARNING AUDIO_NAME_VERBOSE ": unable to get DMA channels/n" ); return -EBUSY; } input_stream.dmach = DMA_CH1; if (audio_init_dma(&input_stream, "UDA1341 in")) { audio_clear_dma(&input_stream,&s3c2410iis_dma_in); printk( KERN_WARNING AUDIO_NAME_VERBOSE ": unable to get DMA channels/n" ); return -EBUSY; } audio_dev_dsp = register_sound_dsp(&smdk2410_audio_fops, -1); audio_dev_mixer = register_sound_mixer(&smdk2410_mixer_fops, -1); printk(AUDIO_NAME_VERBOSE " initialized/n"); return 0; } static int s3c2410iis_remove(struct platform_device *dev) { unregister_sound_dsp(audio_dev_dsp); unregister_sound_mixer(audio_dev_mixer); audio_clear_dma(&output_stream,&s3c2410iis_dma_out); audio_clear_dma(&input_stream,&s3c2410iis_dma_in); /* input */ printk(AUDIO_NAME_VERBOSE " unloaded/n"); return 0; } static struct platform_driver s3c2410iis_driver = { .probe = s3c2410iis_probe, .remove = s3c2410iis_remove, .driver = { .name = "s3c2410-iis", .owner = THIS_MODULE, }, };
static int __init s3c2410_uda1341_init(void) {
memzero(&input_stream, sizeof(audio_stream_t)); memzero(&output_stream, sizeof(audio_stream_t)); return platform_driver_register(&s3c2410iis_driver); }
static void __exit s3c2410_uda1341_exit(void) {
platform_driver_unregister(&s3c2410iis_driver); } module_init(s3c2410_uda1341_init); module_exit(s3c2410_uda1341_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("S3C2410 uda1341 sound driver");
把上面的文件保存到sound/oss中,然后修改sound/oss中的kconfig和makefile,使内核加入该文件,然后编译就可以了。
值得注意的地方是,在驱动程序中DMA_CH1和DMA_CH2我是定义成DMACH_I2S_IN和DMACH_I2S_OUT,与其他人的程序中有一定的区别。上面两个量是枚举类型,大家可以查看include/asm-arm/plat-s3c24xx/dma.h文件,里面有它们的定义。
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原文地址 http://blog.chinaunix.net/u1/57747/showart_722754.html