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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 | /* * 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/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 <linux/mutex.h> #include <linux/firmware.h> #include <linux/platform_device.h> #include <linux/uaccess.h> /* For put_user and get_user */ #include <asm/atarihw.h> #include <asm/traps.h> #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; \ } \ } static DEFINE_MUTEX(dsp56k_mutex); static struct dsp56k_device { unsigned long in_use; long maxio, timeout; int tx_wsize, rx_wsize; } dsp56k; static const struct class dsp56k_class = { .name = "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 __user *bin, int len) { struct platform_device *pdev; const struct firmware *fw; const char fw_name[] = "dsp56k/bootstrap.bin"; int err; int i; dsp56k_reset(); pdev = platform_device_register_simple("dsp56k", 0, NULL, 0); if (IS_ERR(pdev)) { printk(KERN_ERR "Failed to register device for \"%s\"\n", fw_name); return -EINVAL; } err = request_firmware(&fw, fw_name, &pdev->dev); platform_device_unregister(pdev); if (err) { printk(KERN_ERR "Failed to load image \"%s\" err %d\n", fw_name, err); return err; } if (fw->size % 3) { printk(KERN_ERR "Bogus length %d in image \"%s\"\n", fw->size, fw_name); release_firmware(fw); return -EINVAL; } for (i = 0; i < fw->size; i = i + 3) { /* tx_wait(10); */ dsp56k_host_interface.data.b[1] = fw->data[i]; dsp56k_host_interface.data.b[2] = fw->data[i + 1]; dsp56k_host_interface.data.b[3] = fw->data[i + 2]; } release_firmware(fw); 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_inode(file); 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_inode(file); 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 long dsp56k_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int dev = iminor(file_inode(file)) & 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; } mutex_lock(&dsp56k_mutex); r = dsp56k_upload(bin, len); mutex_unlock(&dsp56k_mutex); if (r < 0) { return r; } break; } case DSP56K_SET_TX_WSIZE: if (arg > 4 || arg < 1) return -EINVAL; mutex_lock(&dsp56k_mutex); dsp56k.tx_wsize = (int) arg; mutex_unlock(&dsp56k_mutex); break; case DSP56K_SET_RX_WSIZE: if (arg > 4 || arg < 1) return -EINVAL; mutex_lock(&dsp56k_mutex); dsp56k.rx_wsize = (int) arg; mutex_unlock(&dsp56k_mutex); 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; mutex_lock(&dsp56k_mutex); 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; mutex_unlock(&dsp56k_mutex); return put_user(status, &hf->status); } case DSP56K_HOST_CMD: if (arg > 31) return -EINVAL; mutex_lock(&dsp56k_mutex); dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) | DSP56K_CVR_HC); mutex_unlock(&dsp56k_mutex); 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 __poll_t dsp56k_poll(struct file *file, poll_table *wait) { int dev = iminor(file_inode(file)) & 0x0f; switch(dev) { case DSP56K_DEV_56001: /* poll_wait(file, ???, wait); */ return EPOLLIN | EPOLLRDNORM | EPOLLOUT; 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; int ret = 0; mutex_lock(&dsp56k_mutex); switch(dev) { case DSP56K_DEV_56001: if (test_and_set_bit(0, &dsp56k.in_use)) { ret = -EBUSY; goto out; } 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: ret = -ENODEV; } out: mutex_unlock(&dsp56k_mutex); return ret; } 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, .unlocked_ioctl = dsp56k_ioctl, .open = dsp56k_open, .release = dsp56k_release, .llseek = noop_llseek, }; /****** Init and module functions ******/ static const char banner[] __initconst = KERN_INFO "DSP56k driver installed\n"; static int __init dsp56k_init_driver(void) { int err; 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; } err = class_register(&dsp56k_class); if (err) goto out_chrdev; device_create(&dsp56k_class, NULL, MKDEV(DSP56K_MAJOR, 0), NULL, "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_unregister(&dsp56k_class); unregister_chrdev(DSP56K_MAJOR, "dsp56k"); } module_exit(dsp56k_cleanup_driver); MODULE_DESCRIPTION("Atari DSP56001 Device Driver"); MODULE_LICENSE("GPL"); MODULE_FIRMWARE("dsp56k/bootstrap.bin"); |