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dsp56k.c

/*
 * The DSP56001 Device Driver, saviour of the Free World(tm)
 *
 * Authors: Fredrik Noring   <noring@nocrew.org>
 *          lars brinkhoff   <lars@nocrew.org>
 *          Tomas Berndtsson <tomas@nocrew.org>
 *
 * First version May 1996
 *
 * History:
 *  97-01-29   Tomas Berndtsson,
 *               Integrated with Linux 2.1.21 kernel sources.
 *  97-02-15   Tomas Berndtsson,
 *               Fixed for kernel 2.1.26
 *
 * BUGS:
 *  Hmm... there must be something here :)
 *
 * Copyright (C) 1996,1997 Fredrik Noring, lars brinkhoff & Tomas Berndtsson
 *
 * 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/slab.h> /* for kmalloc() and kfree() */
#include <linux/major.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>      /* guess what */
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/device.h>

#include <asm/atarihw.h>
#include <asm/traps.h>
#include <asm/uaccess.h>      /* For put_user and get_user */

#include <asm/dsp56k.h>

/* minor devices */
#define DSP56K_DEV_56001        0    /* The only device so far */

#define TIMEOUT    10   /* Host port timeout in number of tries */
#define MAXIO    2048   /* Maximum number of words before sleep */
#define DSP56K_MAX_BINARY_LENGTH (3*64*1024)

#define DSP56K_TX_INT_ON      dsp56k_host_interface.icr |=  DSP56K_ICR_TREQ
#define DSP56K_RX_INT_ON      dsp56k_host_interface.icr |=  DSP56K_ICR_RREQ
#define DSP56K_TX_INT_OFF     dsp56k_host_interface.icr &= ~DSP56K_ICR_TREQ
#define DSP56K_RX_INT_OFF     dsp56k_host_interface.icr &= ~DSP56K_ICR_RREQ

#define DSP56K_TRANSMIT       (dsp56k_host_interface.isr & DSP56K_ISR_TXDE)
#define DSP56K_RECEIVE        (dsp56k_host_interface.isr & DSP56K_ISR_RXDF)

#define handshake(count, maxio, timeout, ENABLE, f) \
{ \
      long i, t, m; \
      while (count > 0) { \
            m = min_t(unsigned long, count, maxio); \
            for (i = 0; i < m; i++) { \
                  for (t = 0; t < timeout && !ENABLE; t++) \
                        msleep(20); \
                  if(!ENABLE) \
                        return -EIO; \
                  f; \
            } \
            count -= m; \
            if (m == maxio) msleep(20); \
      } \
}

#define tx_wait(n) \
{ \
      int t; \
      for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
            msleep(10); \
      if(!DSP56K_TRANSMIT) { \
            return -EIO; \
      } \
}

#define rx_wait(n) \
{ \
      int t; \
      for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
            msleep(10); \
      if(!DSP56K_RECEIVE) { \
            return -EIO; \
      } \
}

/* DSP56001 bootstrap code */
static char bootstrap[] = {
      0x0c, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x60, 0xf4, 0x00, 0x00, 0x00, 0x4f, 0x61, 0xf4,
      0x00, 0x00, 0x7e, 0xa9, 0x06, 0x2e, 0x80, 0x00, 0x00, 0x47,
      0x07, 0xd8, 0x84, 0x07, 0x59, 0x84, 0x08, 0xf4, 0xa8, 0x00,
      0x00, 0x04, 0x08, 0xf4, 0xbf, 0x00, 0x0c, 0x00, 0x00, 0xfe,
      0xb8, 0x0a, 0xf0, 0x80, 0x00, 0x7e, 0xa9, 0x08, 0xf4, 0xa0,
      0x00, 0x00, 0x01, 0x08, 0xf4, 0xbe, 0x00, 0x00, 0x00, 0x0a,
      0xa9, 0x80, 0x00, 0x7e, 0xad, 0x08, 0x4e, 0x2b, 0x44, 0xf4,
      0x00, 0x00, 0x00, 0x03, 0x44, 0xf4, 0x45, 0x00, 0x00, 0x01,
      0x0e, 0xa0, 0x00, 0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xb5, 0x08,
      0x50, 0x2b, 0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xb8, 0x08, 0x46,
      0x2b, 0x44, 0xf4, 0x45, 0x00, 0x00, 0x02, 0x0a, 0xf0, 0xaa,
      0x00, 0x7e, 0xc9, 0x20, 0x00, 0x45, 0x0a, 0xf0, 0xaa, 0x00,
      0x7e, 0xd0, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xc6, 0x0a, 0xa9,
      0x80, 0x00, 0x7e, 0xc4, 0x08, 0x58, 0x6b, 0x0a, 0xf0, 0x80,
      0x00, 0x7e, 0xad, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xcd, 0x0a,
      0xa9, 0x80, 0x00, 0x7e, 0xcb, 0x08, 0x58, 0xab, 0x0a, 0xf0,
      0x80, 0x00, 0x7e, 0xad, 0x06, 0xc6, 0x00, 0x00, 0x7e, 0xd4,
      0x0a, 0xa9, 0x80, 0x00, 0x7e, 0xd2, 0x08, 0x58, 0xeb, 0x0a,
      0xf0, 0x80, 0x00, 0x7e, 0xad};
static int sizeof_bootstrap = 375;


static struct dsp56k_device {
      unsigned long in_use;
      long maxio, timeout;
      int tx_wsize, rx_wsize;
} dsp56k;

static struct class *dsp56k_class;

static int dsp56k_reset(void)
{
      u_char status;
      
      /* Power down the DSP */
      sound_ym.rd_data_reg_sel = 14;
      status = sound_ym.rd_data_reg_sel & 0xef;
      sound_ym.wd_data = status;
      sound_ym.wd_data = status | 0x10;
  
      udelay(10);
  
      /* Power up the DSP */
      sound_ym.rd_data_reg_sel = 14;
      sound_ym.wd_data = sound_ym.rd_data_reg_sel & 0xef;

      return 0;
}

static int dsp56k_upload(u_char __user *bin, int len)
{
      int i;
      u_char *p;
      
      dsp56k_reset();
  
      p = bootstrap;
      for (i = 0; i < sizeof_bootstrap/3; i++) {
            /* tx_wait(10); */
            dsp56k_host_interface.data.b[1] = *p++;
            dsp56k_host_interface.data.b[2] = *p++;
            dsp56k_host_interface.data.b[3] = *p++;
      }
      for (; i < 512; i++) {
            /* tx_wait(10); */
            dsp56k_host_interface.data.b[1] = 0;
            dsp56k_host_interface.data.b[2] = 0;
            dsp56k_host_interface.data.b[3] = 0;
      }
  
      for (i = 0; i < len; i++) {
            tx_wait(10);
            get_user(dsp56k_host_interface.data.b[1], bin++);
            get_user(dsp56k_host_interface.data.b[2], bin++);
            get_user(dsp56k_host_interface.data.b[3], bin++);
      }

      tx_wait(10);
      dsp56k_host_interface.data.l = 3;    /* Magic execute */

      return 0;
}

static ssize_t dsp56k_read(struct file *file, char __user *buf, size_t count,
                     loff_t *ppos)
{
      struct inode *inode = file->f_path.dentry->d_inode;
      int dev = iminor(inode) & 0x0f;

      switch(dev)
      {
      case DSP56K_DEV_56001:
      {

            long n;

            /* Don't do anything if nothing is to be done */
            if (!count) return 0;

            n = 0;
            switch (dsp56k.rx_wsize) {
            case 1:  /* 8 bit */
            {
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
                          put_user(dsp56k_host_interface.data.b[3], buf+n++));
                  return n;
            }
            case 2:  /* 16 bit */
            {
                  short __user *data;

                  count /= 2;
                  data = (short __user *) buf;
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
                          put_user(dsp56k_host_interface.data.w[1], data+n++));
                  return 2*n;
            }
            case 3:  /* 24 bit */
            {
                  count /= 3;
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
                          put_user(dsp56k_host_interface.data.b[1], buf+n++);
                          put_user(dsp56k_host_interface.data.b[2], buf+n++);
                          put_user(dsp56k_host_interface.data.b[3], buf+n++));
                  return 3*n;
            }
            case 4:  /* 32 bit */
            {
                  long __user *data;

                  count /= 4;
                  data = (long __user *) buf;
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
                          put_user(dsp56k_host_interface.data.l, data+n++));
                  return 4*n;
            }
            }
            return -EFAULT;
      }

      default:
            printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
            return -ENXIO;
      }
}

static ssize_t dsp56k_write(struct file *file, const char __user *buf, size_t count,
                      loff_t *ppos)
{
      struct inode *inode = file->f_path.dentry->d_inode;
      int dev = iminor(inode) & 0x0f;

      switch(dev)
      {
      case DSP56K_DEV_56001:
      {
            long n;

            /* Don't do anything if nothing is to be done */
            if (!count) return 0;

            n = 0;
            switch (dsp56k.tx_wsize) {
            case 1:  /* 8 bit */
            {
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
                          get_user(dsp56k_host_interface.data.b[3], buf+n++));
                  return n;
            }
            case 2:  /* 16 bit */
            {
                  const short __user *data;

                  count /= 2;
                  data = (const short __user *)buf;
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
                          get_user(dsp56k_host_interface.data.w[1], data+n++));
                  return 2*n;
            }
            case 3:  /* 24 bit */
            {
                  count /= 3;
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
                          get_user(dsp56k_host_interface.data.b[1], buf+n++);
                          get_user(dsp56k_host_interface.data.b[2], buf+n++);
                          get_user(dsp56k_host_interface.data.b[3], buf+n++));
                  return 3*n;
            }
            case 4:  /* 32 bit */
            {
                  const long __user *data;

                  count /= 4;
                  data = (const long __user *)buf;
                  handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
                          get_user(dsp56k_host_interface.data.l, data+n++));
                  return 4*n;
            }
            }

            return -EFAULT;
      }
      default:
            printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
            return -ENXIO;
      }
}

static int dsp56k_ioctl(struct inode *inode, struct file *file,
                  unsigned int cmd, unsigned long arg)
{
      int dev = iminor(inode) & 0x0f;
      void __user *argp = (void __user *)arg;

      switch(dev)
      {
      case DSP56K_DEV_56001:

            switch(cmd) {
            case DSP56K_UPLOAD:
            {
                  char __user *bin;
                  int r, len;
                  struct dsp56k_upload __user *binary = argp;
    
                  if(get_user(len, &binary->len) < 0)
                        return -EFAULT;
                  if(get_user(bin, &binary->bin) < 0)
                        return -EFAULT;
            
                  if (len == 0) {
                        return -EINVAL;      /* nothing to upload?!? */
                  }
                  if (len > DSP56K_MAX_BINARY_LENGTH) {
                        return -EINVAL;
                  }
    
                  r = dsp56k_upload(bin, len);
                  if (r < 0) {
                        return r;
                  }
    
                  break;
            }
            case DSP56K_SET_TX_WSIZE:
                  if (arg > 4 || arg < 1)
                        return -EINVAL;
                  dsp56k.tx_wsize = (int) arg;
                  break;
            case DSP56K_SET_RX_WSIZE:
                  if (arg > 4 || arg < 1)
                        return -EINVAL;
                  dsp56k.rx_wsize = (int) arg;
                  break;
            case DSP56K_HOST_FLAGS:
            {
                  int dir, out, status;
                  struct dsp56k_host_flags __user *hf = argp;
    
                  if(get_user(dir, &hf->dir) < 0)
                        return -EFAULT;
                  if(get_user(out, &hf->out) < 0)
                        return -EFAULT;

                  if ((dir & 0x1) && (out & 0x1))
                        dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
                  else if (dir & 0x1)
                        dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
                  if ((dir & 0x2) && (out & 0x2))
                        dsp56k_host_interface.icr |= DSP56K_ICR_HF1;
                  else if (dir & 0x2)
                        dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;

                  status = 0;
                  if (dsp56k_host_interface.icr & DSP56K_ICR_HF0) status |= 0x1;
                  if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
                  if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
                  if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;

                  return put_user(status, &hf->status);
            }
            case DSP56K_HOST_CMD:
                  if (arg > 31 || arg < 0)
                        return -EINVAL;
                  dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
                                               DSP56K_CVR_HC);
                  break;
            default:
                  return -EINVAL;
            }
            return 0;

      default:
            printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
            return -ENXIO;
      }
}

/* As of 2.1.26 this should be dsp56k_poll,
 * but how do I then check device minor number?
 * Do I need this function at all???
 */
#if 0
static unsigned int dsp56k_poll(struct file *file, poll_table *wait)
{
      int dev = iminor(file->f_path.dentry->d_inode) & 0x0f;

      switch(dev)
      {
      case DSP56K_DEV_56001:
            /* poll_wait(file, ???, wait); */
            return POLLIN | POLLRDNORM | POLLOUT;

      default:
            printk("DSP56k driver: Unknown minor device: %d\n", dev);
            return 0;
      }
}
#endif

static int dsp56k_open(struct inode *inode, struct file *file)
{
      int dev = iminor(inode) & 0x0f;

      switch(dev)
      {
      case DSP56K_DEV_56001:

            if (test_and_set_bit(0, &dsp56k.in_use))
                  return -EBUSY;

            dsp56k.timeout = TIMEOUT;
            dsp56k.maxio = MAXIO;
            dsp56k.rx_wsize = dsp56k.tx_wsize = 4; 

            DSP56K_TX_INT_OFF;
            DSP56K_RX_INT_OFF;

            /* Zero host flags */
            dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
            dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;

            break;

      default:
            return -ENODEV;
      }

      return 0;
}

static int dsp56k_release(struct inode *inode, struct file *file)
{
      int dev = iminor(inode) & 0x0f;

      switch(dev)
      {
      case DSP56K_DEV_56001:
            clear_bit(0, &dsp56k.in_use);
            break;
      default:
            printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
            return -ENXIO;
      }

      return 0;
}

static const struct file_operations dsp56k_fops = {
      .owner            = THIS_MODULE,
      .read       = dsp56k_read,
      .write            = dsp56k_write,
      .ioctl            = dsp56k_ioctl,
      .open       = dsp56k_open,
      .release    = dsp56k_release,
};


/****** Init and module functions ******/

static char banner[] __initdata = KERN_INFO "DSP56k driver installed\n";

static int __init dsp56k_init_driver(void)
{
      int err = 0;

      if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
            printk("DSP56k driver: Hardware not present\n");
            return -ENODEV;
      }

      if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
            printk("DSP56k driver: Unable to register driver\n");
            return -ENODEV;
      }
      dsp56k_class = class_create(THIS_MODULE, "dsp56k");
      if (IS_ERR(dsp56k_class)) {
            err = PTR_ERR(dsp56k_class);
            goto out_chrdev;
      }
      device_create(dsp56k_class, NULL, MKDEV(DSP56K_MAJOR, 0), "dsp56k");

      printk(banner);
      goto out;

out_chrdev:
      unregister_chrdev(DSP56K_MAJOR, "dsp56k");
out:
      return err;
}
module_init(dsp56k_init_driver);

static void __exit dsp56k_cleanup_driver(void)
{
      device_destroy(dsp56k_class, MKDEV(DSP56K_MAJOR, 0));
      class_destroy(dsp56k_class);
      unregister_chrdev(DSP56K_MAJOR, "dsp56k");
}
module_exit(dsp56k_cleanup_driver);

MODULE_LICENSE("GPL");

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