dsp56k.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:13k
- /*
- * 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/version.h>
- #include <linux/slab.h> /* for kmalloc() and kfree() */
- #include <linux/sched.h> /* for struct wait_queue etc */
- #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/devfs_fs_kernel.h>
- #include <linux/smp_lock.h>
- #include <asm/segment.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 wait_some(n)
- {
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(n);
- }
- #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++)
- wait_some(HZ/50);
- if(!ENABLE)
- return -EIO;
- f;
- }
- count -= m;
- if (m == maxio) wait_some(HZ/50);
- }
- }
- #define tx_wait(n)
- {
- int t;
- for(t = 0; t < n && !DSP56K_TRANSMIT; t++)
- wait_some(HZ/100);
- if(!DSP56K_TRANSMIT) {
- return -EIO;
- }
- }
- #define rx_wait(n)
- {
- int t;
- for(t = 0; t < n && !DSP56K_RECEIVE; t++)
- wait_some(HZ/100);
- 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 {
- long in_use;
- long maxio, timeout;
- int tx_wsize, rx_wsize;
- } dsp56k;
- 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 *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 *buf, size_t count,
- loff_t *ppos)
- {
- struct inode *inode = file->f_dentry->d_inode;
- int dev = MINOR(inode->i_rdev) & 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 *data;
- count /= 2;
- data = (short*) 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 *data;
- count /= 4;
- data = (long*) 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: %dn", dev);
- return -ENXIO;
- }
- }
- static ssize_t dsp56k_write(struct file *file, const char *buf, size_t count,
- loff_t *ppos)
- {
- struct inode *inode = file->f_dentry->d_inode;
- int dev = MINOR(inode->i_rdev) & 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 */
- {
- short *data;
- count /= 2;
- data = (short*) 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 */
- {
- long *data;
- count /= 4;
- data = (long*) 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: %dn", dev);
- return -ENXIO;
- }
- }
- static int dsp56k_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- int dev = MINOR(inode->i_rdev) & 0x0f;
- switch(dev)
- {
- case DSP56K_DEV_56001:
- switch(cmd) {
- case DSP56K_UPLOAD:
- {
- char *bin;
- int r, len;
- struct dsp56k_upload *binary = (struct dsp56k_upload *) arg;
-
- 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 *hf = (struct dsp56k_host_flags*) arg;
-
- 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: %dn", 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 = MINOR(file->f_dentry->d_inode->i_rdev) & 0x0f;
- switch(dev)
- {
- case DSP56K_DEV_56001:
- /* poll_wait(file, ???, wait); */
- return POLLIN | POLLRDNORM | POLLOUT;
- default:
- printk("DSP56k driver: Unknown minor device: %dn", dev);
- return 0;
- }
- }
- #endif
- static int dsp56k_open(struct inode *inode, struct file *file)
- {
- int dev = MINOR(inode->i_rdev) & 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 = MINOR(inode->i_rdev) & 0x0f;
- switch(dev)
- {
- case DSP56K_DEV_56001:
- clear_bit(0, &dsp56k.in_use);
- break;
- default:
- printk(KERN_ERR "DSP56k driver: Unknown minor device: %dn", dev);
- return -ENXIO;
- }
- return 0;
- }
- static 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 devfs_handle_t devfs_handle;
- static char banner[] __initdata = KERN_INFO "DSP56k driver installedn";
- static int __init dsp56k_init_driver(void)
- {
- if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
- printk("DSP56k driver: Hardware not presentn");
- return -ENODEV;
- }
- if(devfs_register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
- printk("DSP56k driver: Unable to register drivern");
- return -ENODEV;
- }
- devfs_handle = devfs_register(NULL, "dsp56k", DEVFS_FL_DEFAULT,
- DSP56K_MAJOR, 0,
- S_IFCHR | S_IRUSR | S_IWUSR,
- &dsp56k_fops, NULL);
- printk(banner);
- return 0;
- }
- module_init(dsp56k_init_driver);
- static void __exit dsp56k_cleanup_driver(void)
- {
- devfs_unregister_chrdev(DSP56K_MAJOR, "dsp56k");
- devfs_unregister(devfs_handle);
- }
- module_exit(dsp56k_cleanup_driver);
- MODULE_LICENSE("GPL");