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