332 строки
6.4 KiB
C
332 строки
6.4 KiB
C
/*
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* sound/oss/sh_dac_audio.c
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*
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* SH DAC based sound :(
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*
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* Copyright (C) 2004,2005 Andriy Skulysh
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/linkage.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/sound.h>
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#include <linux/soundcard.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/irq.h>
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#include <asm/delay.h>
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#include <asm/clock.h>
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#include <asm/cpu/dac.h>
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#include <asm/cpu/timer.h>
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#include <asm/machvec.h>
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#include <asm/hp6xx.h>
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#include <asm/hd64461.h>
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#define MODNAME "sh_dac_audio"
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#define TMU_TOCR_INIT 0x00
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#define TMU1_TCR_INIT 0x0020 /* Clock/4, rising edge; interrupt on */
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#define TMU1_TSTR_INIT 0x02 /* Bit to turn on TMU1 */
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#define BUFFER_SIZE 48000
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static int rate;
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static int empty;
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static char *data_buffer, *buffer_begin, *buffer_end;
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static int in_use, device_major;
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static void dac_audio_start_timer(void)
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{
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u8 tstr;
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tstr = ctrl_inb(TMU_TSTR);
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tstr |= TMU1_TSTR_INIT;
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ctrl_outb(tstr, TMU_TSTR);
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}
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static void dac_audio_stop_timer(void)
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{
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u8 tstr;
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tstr = ctrl_inb(TMU_TSTR);
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tstr &= ~TMU1_TSTR_INIT;
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ctrl_outb(tstr, TMU_TSTR);
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}
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static void dac_audio_reset(void)
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{
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dac_audio_stop_timer();
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buffer_begin = buffer_end = data_buffer;
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empty = 1;
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}
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static void dac_audio_sync(void)
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{
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while (!empty)
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schedule();
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}
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static void dac_audio_start(void)
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{
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if (mach_is_hp6xx()) {
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u16 v = inw(HD64461_GPADR);
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v &= ~HD64461_GPADR_SPEAKER;
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outw(v, HD64461_GPADR);
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}
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sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
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ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
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}
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static void dac_audio_stop(void)
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{
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dac_audio_stop_timer();
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if (mach_is_hp6xx()) {
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u16 v = inw(HD64461_GPADR);
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v |= HD64461_GPADR_SPEAKER;
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outw(v, HD64461_GPADR);
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}
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sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
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sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
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}
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static void dac_audio_set_rate(void)
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{
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unsigned long interval;
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struct clk *clk;
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clk = clk_get("module_clk");
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interval = (clk_get_rate(clk) / 4) / rate;
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clk_put(clk);
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ctrl_outl(interval, TMU1_TCOR);
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ctrl_outl(interval, TMU1_TCNT);
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}
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static int dac_audio_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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int val;
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switch (cmd) {
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case OSS_GETVERSION:
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return put_user(SOUND_VERSION, (int *)arg);
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case SNDCTL_DSP_SYNC:
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dac_audio_sync();
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return 0;
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case SNDCTL_DSP_RESET:
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dac_audio_reset();
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return 0;
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case SNDCTL_DSP_GETFMTS:
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return put_user(AFMT_U8, (int *)arg);
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case SNDCTL_DSP_SETFMT:
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return put_user(AFMT_U8, (int *)arg);
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case SNDCTL_DSP_NONBLOCK:
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file->f_flags |= O_NONBLOCK;
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return 0;
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case SNDCTL_DSP_GETCAPS:
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return 0;
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case SOUND_PCM_WRITE_RATE:
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val = *(int *)arg;
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if (val > 0) {
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rate = val;
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dac_audio_set_rate();
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}
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return put_user(rate, (int *)arg);
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case SNDCTL_DSP_STEREO:
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return put_user(0, (int *)arg);
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case SOUND_PCM_WRITE_CHANNELS:
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return put_user(1, (int *)arg);
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case SNDCTL_DSP_SETDUPLEX:
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return -EINVAL;
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case SNDCTL_DSP_PROFILE:
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return -EINVAL;
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case SNDCTL_DSP_GETBLKSIZE:
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return put_user(BUFFER_SIZE, (int *)arg);
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case SNDCTL_DSP_SETFRAGMENT:
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return 0;
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default:
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printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
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cmd);
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return -EINVAL;
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}
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return -EINVAL;
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}
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static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
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loff_t * ppos)
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{
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int free;
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int nbytes;
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if (count < 0)
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return -EINVAL;
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if (!count) {
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dac_audio_sync();
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return 0;
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}
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free = buffer_begin - buffer_end;
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if (free < 0)
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free += BUFFER_SIZE;
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if ((free == 0) && (empty))
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free = BUFFER_SIZE;
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if (count > free)
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count = free;
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if (buffer_begin > buffer_end) {
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if (copy_from_user((void *)buffer_end, buf, count))
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return -EFAULT;
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buffer_end += count;
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} else {
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nbytes = data_buffer + BUFFER_SIZE - buffer_end;
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if (nbytes > count) {
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if (copy_from_user((void *)buffer_end, buf, count))
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return -EFAULT;
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buffer_end += count;
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} else {
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if (copy_from_user((void *)buffer_end, buf, nbytes))
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return -EFAULT;
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if (copy_from_user
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((void *)data_buffer, buf + nbytes, count - nbytes))
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return -EFAULT;
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buffer_end = data_buffer + count - nbytes;
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}
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}
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if (empty) {
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empty = 0;
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dac_audio_start_timer();
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}
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return count;
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}
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static ssize_t dac_audio_read(struct file *file, char *buf, size_t count,
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loff_t * ppos)
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{
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return -EINVAL;
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}
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static int dac_audio_open(struct inode *inode, struct file *file)
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{
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if (file->f_mode & FMODE_READ)
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return -ENODEV;
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if (in_use)
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return -EBUSY;
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in_use = 1;
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dac_audio_start();
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return 0;
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}
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static int dac_audio_release(struct inode *inode, struct file *file)
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{
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dac_audio_sync();
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dac_audio_stop();
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in_use = 0;
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return 0;
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}
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const struct file_operations dac_audio_fops = {
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.read = dac_audio_read,
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.write = dac_audio_write,
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.ioctl = dac_audio_ioctl,
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.open = dac_audio_open,
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.release = dac_audio_release,
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};
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static irqreturn_t timer1_interrupt(int irq, void *dev)
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{
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unsigned long timer_status;
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timer_status = ctrl_inw(TMU1_TCR);
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timer_status &= ~0x100;
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ctrl_outw(timer_status, TMU1_TCR);
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if (!empty) {
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sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
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buffer_begin++;
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if (buffer_begin == data_buffer + BUFFER_SIZE)
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buffer_begin = data_buffer;
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if (buffer_begin == buffer_end) {
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empty = 1;
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dac_audio_stop_timer();
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}
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}
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return IRQ_HANDLED;
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}
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static int __init dac_audio_init(void)
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{
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int retval;
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if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
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printk(KERN_ERR "Cannot register dsp device");
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return device_major;
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}
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in_use = 0;
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data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
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if (data_buffer == NULL)
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return -ENOMEM;
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dac_audio_reset();
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rate = 8000;
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dac_audio_set_rate();
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retval =
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request_irq(TIMER1_IRQ, timer1_interrupt, IRQF_DISABLED, MODNAME, 0);
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if (retval < 0) {
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printk(KERN_ERR "sh_dac_audio: IRQ %d request failed\n",
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TIMER1_IRQ);
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return retval;
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}
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return 0;
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}
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static void __exit dac_audio_exit(void)
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{
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free_irq(TIMER1_IRQ, 0);
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unregister_sound_dsp(device_major);
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kfree((void *)data_buffer);
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}
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module_init(dac_audio_init);
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module_exit(dac_audio_exit);
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MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
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MODULE_DESCRIPTION("SH DAC sound driver");
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MODULE_LICENSE("GPL");
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