2 * The DSP56001 Device Driver, saviour of the Free World(tm)
4 * Authors: Fredrik Noring <noring@nocrew.org>
5 * lars brinkhoff <lars@nocrew.org>
6 * Tomas Berndtsson <tomas@nocrew.org>
8 * First version May 1996
11 * 97-01-29 Tomas Berndtsson,
12 * Integrated with Linux 2.1.21 kernel sources.
13 * 97-02-15 Tomas Berndtsson,
14 * Fixed for kernel 2.1.26
17 * Hmm... there must be something here :)
19 * Copyright (C) 1996,1997 Fredrik Noring, lars brinkhoff & Tomas Berndtsson
21 * This file is subject to the terms and conditions of the GNU General Public
22 * License. See the file COPYING in the main directory of this archive
26 #include <linux/module.h>
27 #include <linux/slab.h> /* for kmalloc() and kfree() */
28 #include <linux/major.h>
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/delay.h> /* guess what */
34 #include <linux/init.h>
35 #include <linux/device.h>
36 #include <linux/smp_lock.h>
37 #include <linux/firmware.h>
38 #include <linux/platform_device.h>
39 #include <linux/uaccess.h> /* For put_user and get_user */
41 #include <asm/atarihw.h>
42 #include <asm/traps.h>
44 #include <asm/dsp56k.h>
47 #define DSP56K_DEV_56001 0 /* The only device so far */
49 #define TIMEOUT 10 /* Host port timeout in number of tries */
50 #define MAXIO 2048 /* Maximum number of words before sleep */
51 #define DSP56K_MAX_BINARY_LENGTH (3*64*1024)
53 #define DSP56K_TX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_TREQ
54 #define DSP56K_RX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_RREQ
55 #define DSP56K_TX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_TREQ
56 #define DSP56K_RX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_RREQ
58 #define DSP56K_TRANSMIT (dsp56k_host_interface.isr & DSP56K_ISR_TXDE)
59 #define DSP56K_RECEIVE (dsp56k_host_interface.isr & DSP56K_ISR_RXDF)
61 #define handshake(count, maxio, timeout, ENABLE, f) \
65 m = min_t(unsigned long, count, maxio); \
66 for (i = 0; i < m; i++) { \
67 for (t = 0; t < timeout && !ENABLE; t++) \
74 if (m == maxio) msleep(20); \
81 for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
83 if(!DSP56K_TRANSMIT) { \
91 for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
93 if(!DSP56K_RECEIVE) { \
98 static struct dsp56k_device {
101 int tx_wsize, rx_wsize;
104 static struct class *dsp56k_class;
106 static int dsp56k_reset(void)
110 /* Power down the DSP */
111 sound_ym.rd_data_reg_sel = 14;
112 status = sound_ym.rd_data_reg_sel & 0xef;
113 sound_ym.wd_data = status;
114 sound_ym.wd_data = status | 0x10;
118 /* Power up the DSP */
119 sound_ym.rd_data_reg_sel = 14;
120 sound_ym.wd_data = sound_ym.rd_data_reg_sel & 0xef;
125 static int dsp56k_upload(u_char __user *bin, int len)
127 struct platform_device *pdev;
128 const struct firmware *fw;
129 const char fw_name[] = "dsp56k/bootstrap.bin";
135 pdev = platform_device_register_simple("dsp56k", 0, NULL, 0);
137 printk(KERN_ERR "Failed to register device for \"%s\"\n",
141 err = request_firmware(&fw, fw_name, &pdev->dev);
142 platform_device_unregister(pdev);
144 printk(KERN_ERR "Failed to load image \"%s\" err %d\n",
149 printk(KERN_ERR "Bogus length %d in image \"%s\"\n",
151 release_firmware(fw);
154 for (i = 0; i < fw->size; i = i + 3) {
156 dsp56k_host_interface.data.b[1] = fw->data[i];
157 dsp56k_host_interface.data.b[2] = fw->data[i + 1];
158 dsp56k_host_interface.data.b[3] = fw->data[i + 2];
160 release_firmware(fw);
161 for (; i < 512; i++) {
163 dsp56k_host_interface.data.b[1] = 0;
164 dsp56k_host_interface.data.b[2] = 0;
165 dsp56k_host_interface.data.b[3] = 0;
168 for (i = 0; i < len; i++) {
170 get_user(dsp56k_host_interface.data.b[1], bin++);
171 get_user(dsp56k_host_interface.data.b[2], bin++);
172 get_user(dsp56k_host_interface.data.b[3], bin++);
176 dsp56k_host_interface.data.l = 3; /* Magic execute */
181 static ssize_t dsp56k_read(struct file *file, char __user *buf, size_t count,
184 struct inode *inode = file->f_path.dentry->d_inode;
185 int dev = iminor(inode) & 0x0f;
189 case DSP56K_DEV_56001:
194 /* Don't do anything if nothing is to be done */
195 if (!count) return 0;
198 switch (dsp56k.rx_wsize) {
201 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
202 put_user(dsp56k_host_interface.data.b[3], buf+n++));
210 data = (short __user *) buf;
211 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
212 put_user(dsp56k_host_interface.data.w[1], data+n++));
218 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
219 put_user(dsp56k_host_interface.data.b[1], buf+n++);
220 put_user(dsp56k_host_interface.data.b[2], buf+n++);
221 put_user(dsp56k_host_interface.data.b[3], buf+n++));
229 data = (long __user *) buf;
230 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
231 put_user(dsp56k_host_interface.data.l, data+n++));
239 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
244 static ssize_t dsp56k_write(struct file *file, const char __user *buf, size_t count,
247 struct inode *inode = file->f_path.dentry->d_inode;
248 int dev = iminor(inode) & 0x0f;
252 case DSP56K_DEV_56001:
256 /* Don't do anything if nothing is to be done */
257 if (!count) return 0;
260 switch (dsp56k.tx_wsize) {
263 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
264 get_user(dsp56k_host_interface.data.b[3], buf+n++));
269 const short __user *data;
272 data = (const short __user *)buf;
273 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
274 get_user(dsp56k_host_interface.data.w[1], data+n++));
280 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
281 get_user(dsp56k_host_interface.data.b[1], buf+n++);
282 get_user(dsp56k_host_interface.data.b[2], buf+n++);
283 get_user(dsp56k_host_interface.data.b[3], buf+n++));
288 const long __user *data;
291 data = (const long __user *)buf;
292 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
293 get_user(dsp56k_host_interface.data.l, data+n++));
301 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
306 static long dsp56k_ioctl(struct file *file, unsigned int cmd,
309 int dev = iminor(file->f_path.dentry->d_inode) & 0x0f;
310 void __user *argp = (void __user *)arg;
314 case DSP56K_DEV_56001:
321 struct dsp56k_upload __user *binary = argp;
323 if(get_user(len, &binary->len) < 0)
325 if(get_user(bin, &binary->bin) < 0)
329 return -EINVAL; /* nothing to upload?!? */
331 if (len > DSP56K_MAX_BINARY_LENGTH) {
335 r = dsp56k_upload(bin, len);
343 case DSP56K_SET_TX_WSIZE:
344 if (arg > 4 || arg < 1)
347 dsp56k.tx_wsize = (int) arg;
350 case DSP56K_SET_RX_WSIZE:
351 if (arg > 4 || arg < 1)
354 dsp56k.rx_wsize = (int) arg;
357 case DSP56K_HOST_FLAGS:
359 int dir, out, status;
360 struct dsp56k_host_flags __user *hf = argp;
362 if(get_user(dir, &hf->dir) < 0)
364 if(get_user(out, &hf->out) < 0)
368 if ((dir & 0x1) && (out & 0x1))
369 dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
371 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
372 if ((dir & 0x2) && (out & 0x2))
373 dsp56k_host_interface.icr |= DSP56K_ICR_HF1;
375 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
378 if (dsp56k_host_interface.icr & DSP56K_ICR_HF0) status |= 0x1;
379 if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
380 if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
381 if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;
383 return put_user(status, &hf->status);
385 case DSP56K_HOST_CMD:
386 if (arg > 31 || arg < 0)
389 dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
399 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
404 /* As of 2.1.26 this should be dsp56k_poll,
405 * but how do I then check device minor number?
406 * Do I need this function at all???
409 static unsigned int dsp56k_poll(struct file *file, poll_table *wait)
411 int dev = iminor(file->f_path.dentry->d_inode) & 0x0f;
415 case DSP56K_DEV_56001:
416 /* poll_wait(file, ???, wait); */
417 return POLLIN | POLLRDNORM | POLLOUT;
420 printk("DSP56k driver: Unknown minor device: %d\n", dev);
426 static int dsp56k_open(struct inode *inode, struct file *file)
428 int dev = iminor(inode) & 0x0f;
434 case DSP56K_DEV_56001:
436 if (test_and_set_bit(0, &dsp56k.in_use)) {
441 dsp56k.timeout = TIMEOUT;
442 dsp56k.maxio = MAXIO;
443 dsp56k.rx_wsize = dsp56k.tx_wsize = 4;
448 /* Zero host flags */
449 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
450 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
462 static int dsp56k_release(struct inode *inode, struct file *file)
464 int dev = iminor(inode) & 0x0f;
468 case DSP56K_DEV_56001:
469 clear_bit(0, &dsp56k.in_use);
472 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
479 static const struct file_operations dsp56k_fops = {
480 .owner = THIS_MODULE,
482 .write = dsp56k_write,
483 .unlocked_ioctl = dsp56k_ioctl,
485 .release = dsp56k_release,
489 /****** Init and module functions ******/
491 static char banner[] __initdata = KERN_INFO "DSP56k driver installed\n";
493 static int __init dsp56k_init_driver(void)
497 if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
498 printk("DSP56k driver: Hardware not present\n");
502 if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
503 printk("DSP56k driver: Unable to register driver\n");
506 dsp56k_class = class_create(THIS_MODULE, "dsp56k");
507 if (IS_ERR(dsp56k_class)) {
508 err = PTR_ERR(dsp56k_class);
511 device_create(dsp56k_class, NULL, MKDEV(DSP56K_MAJOR, 0), NULL,
518 unregister_chrdev(DSP56K_MAJOR, "dsp56k");
522 module_init(dsp56k_init_driver);
524 static void __exit dsp56k_cleanup_driver(void)
526 device_destroy(dsp56k_class, MKDEV(DSP56K_MAJOR, 0));
527 class_destroy(dsp56k_class);
528 unregister_chrdev(DSP56K_MAJOR, "dsp56k");
530 module_exit(dsp56k_cleanup_driver);
532 MODULE_LICENSE("GPL");
533 MODULE_FIRMWARE("dsp56k/bootstrap.bin");