1 files changed, 325 insertions, 0 deletions

diff --git a/sound/oss/sh_dac_audio.c b/sound/oss/sh_dac_audio.c
new file mode 100644
index 000000000000..c09cdeedc191
--- /dev/null
+++ b/sound/oss/sh_dac_audio.c
@@ -0,0 +1,325 @@
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/version.h>
+#include <linux/linkage.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/sound.h>
+#include <linux/soundcard.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/irq.h>
+#include <asm/delay.h>
+#include <linux/interrupt.h>
+
+#include <asm/cpu/dac.h>
+
+#ifdef MACH_HP600
+#include <asm/hp6xx/hp6xx.h>
+#include <asm/hd64461/hd64461.h>
+#endif
+
+#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 TMU_TSTR        0xfffffe92
+#define TMU1_TCOR       0xfffffea0
+#define TMU1_TCNT       0xfffffea4
+#define TMU1_TCR        0xfffffea8
+
+#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)
+{
+#ifdef MACH_HP600
+        u16 v;
+        v = inw(HD64461_GPADR);
+        v &= ~HD64461_GPADR_SPEAKER;
+        outw(v, HD64461_GPADR);
+#endif
+        sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
+        ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
+}
+static void dac_audio_stop(void)
+{
+#ifdef MACH_HP600
+        u16 v;
+#endif
+        dac_audio_stop_timer();
+#ifdef MACH_HP600
+        v = inw(HD64461_GPADR);
+        v |= HD64461_GPADR_SPEAKER;
+        outw(v, HD64461_GPADR);
+#endif
+        sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
+}
+
+static void dac_audio_set_rate(void)
+{
+        unsigned long interval;
+
+        interval = (current_cpu_data.module_clock / 4) / rate;
+        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 = (char *)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, SA_INTERRUPT, 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");