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/firmware.h>
37 #include <linux/platform_device.h>
39 #include <asm/atarihw.h>
40 #include <asm/traps.h>
41 #include <asm/uaccess.h> /* For put_user and get_user */
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 struct dsp56k_device
{
100 int tx_wsize
, rx_wsize
;
103 static struct class *dsp56k_class
;
105 static int dsp56k_reset(void)
109 /* Power down the DSP */
110 sound_ym
.rd_data_reg_sel
= 14;
111 status
= sound_ym
.rd_data_reg_sel
& 0xef;
112 sound_ym
.wd_data
= status
;
113 sound_ym
.wd_data
= status
| 0x10;
117 /* Power up the DSP */
118 sound_ym
.rd_data_reg_sel
= 14;
119 sound_ym
.wd_data
= sound_ym
.rd_data_reg_sel
& 0xef;
124 static int dsp56k_upload(u_char __user
*bin
, int len
)
126 struct platform_device
*pdev
;
127 const struct firmware
*fw
;
128 const char fw_name
[] = "dsp56k/bootstrap.bin";
134 pdev
= platform_device_register_simple("dsp56k", 0, NULL
, 0);
136 printk(KERN_ERR
"Failed to register device for \"%s\"\n",
140 err
= request_firmware(&fw
, fw_name
, &pdev
->dev
);
141 platform_device_unregister(pdev
);
143 printk(KERN_ERR
"Failed to load image \"%s\" err %d\n",
148 printk(KERN_ERR
"Bogus length %d in image \"%s\"\n",
150 release_firmware(fw
);
153 for (i
= 0; i
< fw
->size
; i
= i
+ 3) {
155 dsp56k_host_interface
.data
.b
[1] = fw
->data
[i
];
156 dsp56k_host_interface
.data
.b
[2] = fw
->data
[i
+ 1];
157 dsp56k_host_interface
.data
.b
[3] = fw
->data
[i
+ 2];
159 release_firmware(fw
);
160 for (; i
< 512; i
++) {
162 dsp56k_host_interface
.data
.b
[1] = 0;
163 dsp56k_host_interface
.data
.b
[2] = 0;
164 dsp56k_host_interface
.data
.b
[3] = 0;
167 for (i
= 0; i
< len
; i
++) {
169 get_user(dsp56k_host_interface
.data
.b
[1], bin
++);
170 get_user(dsp56k_host_interface
.data
.b
[2], bin
++);
171 get_user(dsp56k_host_interface
.data
.b
[3], bin
++);
175 dsp56k_host_interface
.data
.l
= 3; /* Magic execute */
180 static ssize_t
dsp56k_read(struct file
*file
, char __user
*buf
, size_t count
,
183 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
184 int dev
= iminor(inode
) & 0x0f;
188 case DSP56K_DEV_56001
:
193 /* Don't do anything if nothing is to be done */
194 if (!count
) return 0;
197 switch (dsp56k
.rx_wsize
) {
200 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_RECEIVE
,
201 put_user(dsp56k_host_interface
.data
.b
[3], buf
+n
++));
209 data
= (short __user
*) buf
;
210 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_RECEIVE
,
211 put_user(dsp56k_host_interface
.data
.w
[1], data
+n
++));
217 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_RECEIVE
,
218 put_user(dsp56k_host_interface
.data
.b
[1], buf
+n
++);
219 put_user(dsp56k_host_interface
.data
.b
[2], buf
+n
++);
220 put_user(dsp56k_host_interface
.data
.b
[3], buf
+n
++));
228 data
= (long __user
*) buf
;
229 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_RECEIVE
,
230 put_user(dsp56k_host_interface
.data
.l
, data
+n
++));
238 printk(KERN_ERR
"DSP56k driver: Unknown minor device: %d\n", dev
);
243 static ssize_t
dsp56k_write(struct file
*file
, const char __user
*buf
, size_t count
,
246 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
247 int dev
= iminor(inode
) & 0x0f;
251 case DSP56K_DEV_56001
:
255 /* Don't do anything if nothing is to be done */
256 if (!count
) return 0;
259 switch (dsp56k
.tx_wsize
) {
262 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_TRANSMIT
,
263 get_user(dsp56k_host_interface
.data
.b
[3], buf
+n
++));
268 const short __user
*data
;
271 data
= (const short __user
*)buf
;
272 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_TRANSMIT
,
273 get_user(dsp56k_host_interface
.data
.w
[1], data
+n
++));
279 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_TRANSMIT
,
280 get_user(dsp56k_host_interface
.data
.b
[1], buf
+n
++);
281 get_user(dsp56k_host_interface
.data
.b
[2], buf
+n
++);
282 get_user(dsp56k_host_interface
.data
.b
[3], buf
+n
++));
287 const long __user
*data
;
290 data
= (const long __user
*)buf
;
291 handshake(count
, dsp56k
.maxio
, dsp56k
.timeout
, DSP56K_TRANSMIT
,
292 get_user(dsp56k_host_interface
.data
.l
, data
+n
++));
300 printk(KERN_ERR
"DSP56k driver: Unknown minor device: %d\n", dev
);
305 static int dsp56k_ioctl(struct inode
*inode
, struct file
*file
,
306 unsigned int cmd
, unsigned long arg
)
308 int dev
= iminor(inode
) & 0x0f;
309 void __user
*argp
= (void __user
*)arg
;
313 case DSP56K_DEV_56001
:
320 struct dsp56k_upload __user
*binary
= argp
;
322 if(get_user(len
, &binary
->len
) < 0)
324 if(get_user(bin
, &binary
->bin
) < 0)
328 return -EINVAL
; /* nothing to upload?!? */
330 if (len
> DSP56K_MAX_BINARY_LENGTH
) {
334 r
= dsp56k_upload(bin
, len
);
341 case DSP56K_SET_TX_WSIZE
:
342 if (arg
> 4 || arg
< 1)
344 dsp56k
.tx_wsize
= (int) arg
;
346 case DSP56K_SET_RX_WSIZE
:
347 if (arg
> 4 || arg
< 1)
349 dsp56k
.rx_wsize
= (int) arg
;
351 case DSP56K_HOST_FLAGS
:
353 int dir
, out
, status
;
354 struct dsp56k_host_flags __user
*hf
= argp
;
356 if(get_user(dir
, &hf
->dir
) < 0)
358 if(get_user(out
, &hf
->out
) < 0)
361 if ((dir
& 0x1) && (out
& 0x1))
362 dsp56k_host_interface
.icr
|= DSP56K_ICR_HF0
;
364 dsp56k_host_interface
.icr
&= ~DSP56K_ICR_HF0
;
365 if ((dir
& 0x2) && (out
& 0x2))
366 dsp56k_host_interface
.icr
|= DSP56K_ICR_HF1
;
368 dsp56k_host_interface
.icr
&= ~DSP56K_ICR_HF1
;
371 if (dsp56k_host_interface
.icr
& DSP56K_ICR_HF0
) status
|= 0x1;
372 if (dsp56k_host_interface
.icr
& DSP56K_ICR_HF1
) status
|= 0x2;
373 if (dsp56k_host_interface
.isr
& DSP56K_ISR_HF2
) status
|= 0x4;
374 if (dsp56k_host_interface
.isr
& DSP56K_ISR_HF3
) status
|= 0x8;
376 return put_user(status
, &hf
->status
);
378 case DSP56K_HOST_CMD
:
379 if (arg
> 31 || arg
< 0)
381 dsp56k_host_interface
.cvr
= (u_char
)((arg
& DSP56K_CVR_HV_MASK
) |
390 printk(KERN_ERR
"DSP56k driver: Unknown minor device: %d\n", dev
);
395 /* As of 2.1.26 this should be dsp56k_poll,
396 * but how do I then check device minor number?
397 * Do I need this function at all???
400 static unsigned int dsp56k_poll(struct file
*file
, poll_table
*wait
)
402 int dev
= iminor(file
->f_path
.dentry
->d_inode
) & 0x0f;
406 case DSP56K_DEV_56001
:
407 /* poll_wait(file, ???, wait); */
408 return POLLIN
| POLLRDNORM
| POLLOUT
;
411 printk("DSP56k driver: Unknown minor device: %d\n", dev
);
417 static int dsp56k_open(struct inode
*inode
, struct file
*file
)
419 int dev
= iminor(inode
) & 0x0f;
423 case DSP56K_DEV_56001
:
425 if (test_and_set_bit(0, &dsp56k
.in_use
))
428 dsp56k
.timeout
= TIMEOUT
;
429 dsp56k
.maxio
= MAXIO
;
430 dsp56k
.rx_wsize
= dsp56k
.tx_wsize
= 4;
435 /* Zero host flags */
436 dsp56k_host_interface
.icr
&= ~DSP56K_ICR_HF0
;
437 dsp56k_host_interface
.icr
&= ~DSP56K_ICR_HF1
;
448 static int dsp56k_release(struct inode
*inode
, struct file
*file
)
450 int dev
= iminor(inode
) & 0x0f;
454 case DSP56K_DEV_56001
:
455 clear_bit(0, &dsp56k
.in_use
);
458 printk(KERN_ERR
"DSP56k driver: Unknown minor device: %d\n", dev
);
465 static const struct file_operations dsp56k_fops
= {
466 .owner
= THIS_MODULE
,
468 .write
= dsp56k_write
,
469 .ioctl
= dsp56k_ioctl
,
471 .release
= dsp56k_release
,
475 /****** Init and module functions ******/
477 static char banner
[] __initdata
= KERN_INFO
"DSP56k driver installed\n";
479 static int __init
dsp56k_init_driver(void)
483 if(!MACH_IS_ATARI
|| !ATARIHW_PRESENT(DSP56K
)) {
484 printk("DSP56k driver: Hardware not present\n");
488 if(register_chrdev(DSP56K_MAJOR
, "dsp56k", &dsp56k_fops
)) {
489 printk("DSP56k driver: Unable to register driver\n");
492 dsp56k_class
= class_create(THIS_MODULE
, "dsp56k");
493 if (IS_ERR(dsp56k_class
)) {
494 err
= PTR_ERR(dsp56k_class
);
497 device_create(dsp56k_class
, NULL
, MKDEV(DSP56K_MAJOR
, 0), "dsp56k");
503 unregister_chrdev(DSP56K_MAJOR
, "dsp56k");
507 module_init(dsp56k_init_driver
);
509 static void __exit
dsp56k_cleanup_driver(void)
511 device_destroy(dsp56k_class
, MKDEV(DSP56K_MAJOR
, 0));
512 class_destroy(dsp56k_class
);
513 unregister_chrdev(DSP56K_MAJOR
, "dsp56k");
515 module_exit(dsp56k_cleanup_driver
);
517 MODULE_LICENSE("GPL");
518 MODULE_FIRMWARE("dsp56k/bootstrap.bin");