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/major.h>
28 #include <linux/types.h>
29 #include <linux/errno.h>
30 #include <linux/delay.h> /* guess what */
33 #include <linux/init.h>
34 #include <linux/device.h>
35 #include <linux/mutex.h>
36 #include <linux/firmware.h>
37 #include <linux/platform_device.h>
38 #include <linux/uaccess.h> /* For put_user and get_user */
40 #include <asm/atarihw.h>
41 #include <asm/traps.h>
43 #include <asm/dsp56k.h>
46 #define DSP56K_DEV_56001 0 /* The only device so far */
48 #define TIMEOUT 10 /* Host port timeout in number of tries */
49 #define MAXIO 2048 /* Maximum number of words before sleep */
50 #define DSP56K_MAX_BINARY_LENGTH (3*64*1024)
52 #define DSP56K_TX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_TREQ
53 #define DSP56K_RX_INT_ON dsp56k_host_interface.icr |= DSP56K_ICR_RREQ
54 #define DSP56K_TX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_TREQ
55 #define DSP56K_RX_INT_OFF dsp56k_host_interface.icr &= ~DSP56K_ICR_RREQ
57 #define DSP56K_TRANSMIT (dsp56k_host_interface.isr & DSP56K_ISR_TXDE)
58 #define DSP56K_RECEIVE (dsp56k_host_interface.isr & DSP56K_ISR_RXDF)
60 #define handshake(count, maxio, timeout, ENABLE, f) \
64 m = min_t(unsigned long, count, maxio); \
65 for (i = 0; i < m; i++) { \
66 for (t = 0; t < timeout && !ENABLE; t++) \
73 if (m == maxio) msleep(20); \
80 for(t = 0; t < n && !DSP56K_TRANSMIT; t++) \
82 if(!DSP56K_TRANSMIT) { \
90 for(t = 0; t < n && !DSP56K_RECEIVE; t++) \
92 if(!DSP56K_RECEIVE) { \
97 static DEFINE_MUTEX(dsp56k_mutex);
98 static struct dsp56k_device {
101 int tx_wsize, rx_wsize;
104 static const struct class dsp56k_class = {
108 static int dsp56k_reset(void)
112 /* Power down the DSP */
113 sound_ym.rd_data_reg_sel = 14;
114 status = sound_ym.rd_data_reg_sel & 0xef;
115 sound_ym.wd_data = status;
116 sound_ym.wd_data = status | 0x10;
120 /* Power up the DSP */
121 sound_ym.rd_data_reg_sel = 14;
122 sound_ym.wd_data = sound_ym.rd_data_reg_sel & 0xef;
127 static int dsp56k_upload(u_char __user *bin, int len)
129 struct platform_device *pdev;
130 const struct firmware *fw;
131 const char fw_name[] = "dsp56k/bootstrap.bin";
137 pdev = platform_device_register_simple("dsp56k", 0, NULL, 0);
139 printk(KERN_ERR "Failed to register device for \"%s\"\n",
143 err = request_firmware(&fw, fw_name, &pdev->dev);
144 platform_device_unregister(pdev);
146 printk(KERN_ERR "Failed to load image \"%s\" err %d\n",
151 printk(KERN_ERR "Bogus length %d in image \"%s\"\n",
153 release_firmware(fw);
156 for (i = 0; i < fw->size; i = i + 3) {
158 dsp56k_host_interface.data.b[1] = fw->data[i];
159 dsp56k_host_interface.data.b[2] = fw->data[i + 1];
160 dsp56k_host_interface.data.b[3] = fw->data[i + 2];
162 release_firmware(fw);
163 for (; i < 512; i++) {
165 dsp56k_host_interface.data.b[1] = 0;
166 dsp56k_host_interface.data.b[2] = 0;
167 dsp56k_host_interface.data.b[3] = 0;
170 for (i = 0; i < len; i++) {
172 get_user(dsp56k_host_interface.data.b[1], bin++);
173 get_user(dsp56k_host_interface.data.b[2], bin++);
174 get_user(dsp56k_host_interface.data.b[3], bin++);
178 dsp56k_host_interface.data.l = 3; /* Magic execute */
183 static ssize_t dsp56k_read(struct file *file, char __user *buf, size_t count,
186 struct inode *inode = file_inode(file);
187 int dev = iminor(inode) & 0x0f;
191 case DSP56K_DEV_56001:
196 /* Don't do anything if nothing is to be done */
197 if (!count) return 0;
200 switch (dsp56k.rx_wsize) {
203 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
204 put_user(dsp56k_host_interface.data.b[3], buf+n++));
212 data = (short __user *) buf;
213 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
214 put_user(dsp56k_host_interface.data.w[1], data+n++));
220 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
221 put_user(dsp56k_host_interface.data.b[1], buf+n++);
222 put_user(dsp56k_host_interface.data.b[2], buf+n++);
223 put_user(dsp56k_host_interface.data.b[3], buf+n++));
231 data = (long __user *) buf;
232 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_RECEIVE,
233 put_user(dsp56k_host_interface.data.l, data+n++));
241 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
246 static ssize_t dsp56k_write(struct file *file, const char __user *buf, size_t count,
249 struct inode *inode = file_inode(file);
250 int dev = iminor(inode) & 0x0f;
254 case DSP56K_DEV_56001:
258 /* Don't do anything if nothing is to be done */
259 if (!count) return 0;
262 switch (dsp56k.tx_wsize) {
265 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
266 get_user(dsp56k_host_interface.data.b[3], buf+n++));
271 const short __user *data;
274 data = (const short __user *)buf;
275 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
276 get_user(dsp56k_host_interface.data.w[1], data+n++));
282 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
283 get_user(dsp56k_host_interface.data.b[1], buf+n++);
284 get_user(dsp56k_host_interface.data.b[2], buf+n++);
285 get_user(dsp56k_host_interface.data.b[3], buf+n++));
290 const long __user *data;
293 data = (const long __user *)buf;
294 handshake(count, dsp56k.maxio, dsp56k.timeout, DSP56K_TRANSMIT,
295 get_user(dsp56k_host_interface.data.l, data+n++));
303 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
308 static long dsp56k_ioctl(struct file *file, unsigned int cmd,
311 int dev = iminor(file_inode(file)) & 0x0f;
312 void __user *argp = (void __user *)arg;
316 case DSP56K_DEV_56001:
323 struct dsp56k_upload __user *binary = argp;
325 if(get_user(len, &binary->len) < 0)
327 if(get_user(bin, &binary->bin) < 0)
331 return -EINVAL; /* nothing to upload?!? */
333 if (len > DSP56K_MAX_BINARY_LENGTH) {
336 mutex_lock(&dsp56k_mutex);
337 r = dsp56k_upload(bin, len);
338 mutex_unlock(&dsp56k_mutex);
345 case DSP56K_SET_TX_WSIZE:
346 if (arg > 4 || arg < 1)
348 mutex_lock(&dsp56k_mutex);
349 dsp56k.tx_wsize = (int) arg;
350 mutex_unlock(&dsp56k_mutex);
352 case DSP56K_SET_RX_WSIZE:
353 if (arg > 4 || arg < 1)
355 mutex_lock(&dsp56k_mutex);
356 dsp56k.rx_wsize = (int) arg;
357 mutex_unlock(&dsp56k_mutex);
359 case DSP56K_HOST_FLAGS:
361 int dir, out, status;
362 struct dsp56k_host_flags __user *hf = argp;
364 if(get_user(dir, &hf->dir) < 0)
366 if(get_user(out, &hf->out) < 0)
369 mutex_lock(&dsp56k_mutex);
370 if ((dir & 0x1) && (out & 0x1))
371 dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
373 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
374 if ((dir & 0x2) && (out & 0x2))
375 dsp56k_host_interface.icr |= DSP56K_ICR_HF1;
377 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
380 if (dsp56k_host_interface.icr & DSP56K_ICR_HF0) status |= 0x1;
381 if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
382 if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
383 if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;
384 mutex_unlock(&dsp56k_mutex);
385 return put_user(status, &hf->status);
387 case DSP56K_HOST_CMD:
390 mutex_lock(&dsp56k_mutex);
391 dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
393 mutex_unlock(&dsp56k_mutex);
401 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
406 /* As of 2.1.26 this should be dsp56k_poll,
407 * but how do I then check device minor number?
408 * Do I need this function at all???
411 static __poll_t dsp56k_poll(struct file *file, poll_table *wait)
413 int dev = iminor(file_inode(file)) & 0x0f;
417 case DSP56K_DEV_56001:
418 /* poll_wait(file, ???, wait); */
419 return EPOLLIN | EPOLLRDNORM | EPOLLOUT;
422 printk("DSP56k driver: Unknown minor device: %d\n", dev);
428 static int dsp56k_open(struct inode *inode, struct file *file)
430 int dev = iminor(inode) & 0x0f;
433 mutex_lock(&dsp56k_mutex);
436 case DSP56K_DEV_56001:
438 if (test_and_set_bit(0, &dsp56k.in_use)) {
443 dsp56k.timeout = TIMEOUT;
444 dsp56k.maxio = MAXIO;
445 dsp56k.rx_wsize = dsp56k.tx_wsize = 4;
450 /* Zero host flags */
451 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF0;
452 dsp56k_host_interface.icr &= ~DSP56K_ICR_HF1;
460 mutex_unlock(&dsp56k_mutex);
464 static int dsp56k_release(struct inode *inode, struct file *file)
466 int dev = iminor(inode) & 0x0f;
470 case DSP56K_DEV_56001:
471 clear_bit(0, &dsp56k.in_use);
474 printk(KERN_ERR "DSP56k driver: Unknown minor device: %d\n", dev);
481 static const struct file_operations dsp56k_fops = {
482 .owner = THIS_MODULE,
484 .write = dsp56k_write,
485 .unlocked_ioctl = dsp56k_ioctl,
487 .release = dsp56k_release,
488 .llseek = noop_llseek,
492 /****** Init and module functions ******/
494 static const char banner[] __initconst = KERN_INFO "DSP56k driver installed\n";
496 static int __init dsp56k_init_driver(void)
500 if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
501 printk("DSP56k driver: Hardware not present\n");
505 if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
506 printk("DSP56k driver: Unable to register driver\n");
509 err = class_register(&dsp56k_class);
512 device_create(&dsp56k_class, NULL, MKDEV(DSP56K_MAJOR, 0), NULL,
519 unregister_chrdev(DSP56K_MAJOR, "dsp56k");
523 module_init(dsp56k_init_driver);
525 static void __exit dsp56k_cleanup_driver(void)
527 device_destroy(&dsp56k_class, MKDEV(DSP56K_MAJOR, 0));
528 class_unregister(&dsp56k_class);
529 unregister_chrdev(DSP56K_MAJOR, "dsp56k");
531 module_exit(dsp56k_cleanup_driver);
533 MODULE_LICENSE("GPL");
534 MODULE_FIRMWARE("dsp56k/bootstrap.bin");