1 /* 2 * valkyriefb.c -- frame buffer device for the PowerMac 'valkyrie' display 3 * 4 * Created 8 August 1998 by 5 * Martin Costabel <costabel@wanadoo.fr> and Kevin Schoedel 6 * 7 * Vmode-switching changes and vmode 15/17 modifications created 29 August 8 * 1998 by Barry K. Nathan <barryn@pobox.com>. 9 * 10 * Ported to m68k Macintosh by David Huggins-Daines <dhd@debian.org> 11 * 12 * Derived directly from: 13 * 14 * controlfb.c -- frame buffer device for the PowerMac 'control' display 15 * Copyright (C) 1998 Dan Jacobowitz <dan@debian.org> 16 * 17 * pmc-valkyrie.c -- Console support for PowerMac "valkyrie" display adaptor. 18 * Copyright (C) 1997 Paul Mackerras. 19 * 20 * and indirectly: 21 * 22 * Frame buffer structure from: 23 * drivers/video/chipsfb.c -- frame buffer device for 24 * Chips & Technologies 65550 chip. 25 * 26 * Copyright (C) 1998 Paul Mackerras 27 * 28 * This file is derived from the Powermac "chips" driver: 29 * Copyright (C) 1997 Fabio Riccardi. 30 * And from the frame buffer device for Open Firmware-initialized devices: 31 * Copyright (C) 1997 Geert Uytterhoeven. 32 * 33 * Hardware information from: 34 * control.c: Console support for PowerMac "control" display adaptor. 35 * Copyright (C) 1996 Paul Mackerras 36 * 37 * This file is subject to the terms and conditions of the GNU General Public 38 * License. See the file COPYING in the main directory of this archive for 39 * more details. 40 */ 41 42 #include <linux/module.h> 43 #include <linux/kernel.h> 44 #include <linux/errno.h> 45 #include <linux/string.h> 46 #include <linux/mm.h> 47 #include <linux/slab.h> 48 #include <linux/vmalloc.h> 49 #include <linux/delay.h> 50 #include <linux/interrupt.h> 51 #include <linux/fb.h> 52 #include <linux/selection.h> 53 #include <linux/init.h> 54 #include <linux/nvram.h> 55 #include <linux/adb.h> 56 #include <linux/cuda.h> 57 #include <asm/io.h> 58 #ifdef CONFIG_MAC 59 #include <asm/macintosh.h> 60 #else 61 #include <asm/prom.h> 62 #endif 63 #include <asm/pgtable.h> 64 65 #include "macmodes.h" 66 #include "valkyriefb.h" 67 68 #ifdef CONFIG_MAC 69 /* We don't yet have functions to read the PRAM... perhaps we can 70 adapt them from the PPC code? */ 71 static int default_vmode = VMODE_CHOOSE; 72 static int default_cmode = CMODE_8; 73 #else 74 static int default_vmode = VMODE_NVRAM; 75 static int default_cmode = CMODE_NVRAM; 76 #endif 77 78 struct fb_par_valkyrie { 79 int vmode, cmode; 80 int xres, yres; 81 int vxres, vyres; 82 struct valkyrie_regvals *init; 83 }; 84 85 struct fb_info_valkyrie { 86 struct fb_info info; 87 struct fb_par_valkyrie par; 88 struct cmap_regs __iomem *cmap_regs; 89 unsigned long cmap_regs_phys; 90 91 struct valkyrie_regs __iomem *valkyrie_regs; 92 unsigned long valkyrie_regs_phys; 93 94 __u8 __iomem *frame_buffer; 95 unsigned long frame_buffer_phys; 96 97 int sense; 98 unsigned long total_vram; 99 100 u32 pseudo_palette[16]; 101 }; 102 103 /* 104 * Exported functions 105 */ 106 int valkyriefb_init(void); 107 int valkyriefb_setup(char*); 108 109 static int valkyriefb_check_var(struct fb_var_screeninfo *var, 110 struct fb_info *info); 111 static int valkyriefb_set_par(struct fb_info *info); 112 static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 113 u_int transp, struct fb_info *info); 114 static int valkyriefb_blank(int blank_mode, struct fb_info *info); 115 116 static int read_valkyrie_sense(struct fb_info_valkyrie *p); 117 static void set_valkyrie_clock(unsigned char *params); 118 static int valkyrie_var_to_par(struct fb_var_screeninfo *var, 119 struct fb_par_valkyrie *par, const struct fb_info *fb_info); 120 121 static int valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p); 122 static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix); 123 static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p); 124 125 static struct fb_ops valkyriefb_ops = { 126 .owner = THIS_MODULE, 127 .fb_check_var = valkyriefb_check_var, 128 .fb_set_par = valkyriefb_set_par, 129 .fb_setcolreg = valkyriefb_setcolreg, 130 .fb_blank = valkyriefb_blank, 131 .fb_fillrect = cfb_fillrect, 132 .fb_copyarea = cfb_copyarea, 133 .fb_imageblit = cfb_imageblit, 134 }; 135 136 /* Sets the video mode according to info->var */ 137 static int valkyriefb_set_par(struct fb_info *info) 138 { 139 struct fb_info_valkyrie *p = 140 container_of(info, struct fb_info_valkyrie, info); 141 volatile struct valkyrie_regs __iomem *valkyrie_regs = p->valkyrie_regs; 142 struct fb_par_valkyrie *par = info->par; 143 struct valkyrie_regvals *init; 144 int err; 145 146 if ((err = valkyrie_var_to_par(&info->var, par, info))) 147 return err; 148 149 valkyrie_par_to_fix(par, &info->fix); 150 151 /* Reset the valkyrie */ 152 out_8(&valkyrie_regs->status.r, 0); 153 udelay(100); 154 155 /* Initialize display timing registers */ 156 init = par->init; 157 out_8(&valkyrie_regs->mode.r, init->mode | 0x80); 158 out_8(&valkyrie_regs->depth.r, par->cmode + 3); 159 set_valkyrie_clock(init->clock_params); 160 udelay(100); 161 162 /* Turn on display */ 163 out_8(&valkyrie_regs->mode.r, init->mode); 164 165 return 0; 166 } 167 168 static inline int valkyrie_par_to_var(struct fb_par_valkyrie *par, 169 struct fb_var_screeninfo *var) 170 { 171 return mac_vmode_to_var(par->vmode, par->cmode, var); 172 } 173 174 static int 175 valkyriefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 176 { 177 int err; 178 struct fb_par_valkyrie par; 179 180 if ((err = valkyrie_var_to_par(var, &par, info))) 181 return err; 182 valkyrie_par_to_var(&par, var); 183 return 0; 184 } 185 186 /* 187 * Blank the screen if blank_mode != 0, else unblank. If blank_mode == NULL 188 * then the caller blanks by setting the CLUT (Color Look Up Table) to all 189 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due 190 * to e.g. a video mode which doesn't support it. Implements VESA suspend 191 * and powerdown modes on hardware that supports disabling hsync/vsync: 192 * blank_mode == 2: suspend vsync 193 * blank_mode == 3: suspend hsync 194 * blank_mode == 4: powerdown 195 */ 196 static int valkyriefb_blank(int blank_mode, struct fb_info *info) 197 { 198 struct fb_info_valkyrie *p = 199 container_of(info, struct fb_info_valkyrie, info); 200 struct fb_par_valkyrie *par = info->par; 201 struct valkyrie_regvals *init = par->init; 202 203 if (init == NULL) 204 return 1; 205 206 switch (blank_mode) { 207 case FB_BLANK_UNBLANK: /* unblank */ 208 out_8(&p->valkyrie_regs->mode.r, init->mode); 209 break; 210 case FB_BLANK_NORMAL: 211 return 1; /* get caller to set CLUT to all black */ 212 case FB_BLANK_VSYNC_SUSPEND: 213 case FB_BLANK_HSYNC_SUSPEND: 214 /* 215 * [kps] Value extracted from MacOS. I don't know 216 * whether this bit disables hsync or vsync, or 217 * whether the hardware can do the other as well. 218 */ 219 out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40); 220 break; 221 case FB_BLANK_POWERDOWN: 222 out_8(&p->valkyrie_regs->mode.r, 0x66); 223 break; 224 } 225 return 0; 226 } 227 228 static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 229 u_int transp, struct fb_info *info) 230 { 231 struct fb_info_valkyrie *p = 232 container_of(info, struct fb_info_valkyrie, info); 233 volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs; 234 struct fb_par_valkyrie *par = info->par; 235 236 if (regno > 255) 237 return 1; 238 red >>= 8; 239 green >>= 8; 240 blue >>= 8; 241 242 /* tell clut which address to fill */ 243 out_8(&p->cmap_regs->addr, regno); 244 udelay(1); 245 /* send one color channel at a time */ 246 out_8(&cmap_regs->lut, red); 247 out_8(&cmap_regs->lut, green); 248 out_8(&cmap_regs->lut, blue); 249 250 if (regno < 16 && par->cmode == CMODE_16) 251 ((u32 *)info->pseudo_palette)[regno] = 252 (regno << 10) | (regno << 5) | regno; 253 254 return 0; 255 } 256 257 static inline int valkyrie_vram_reqd(int video_mode, int color_mode) 258 { 259 int pitch; 260 struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1]; 261 262 if ((pitch = init->pitch[color_mode]) == 0) 263 pitch = 2 * init->pitch[0]; 264 return init->vres * pitch; 265 } 266 267 static void set_valkyrie_clock(unsigned char *params) 268 { 269 #ifdef CONFIG_ADB_CUDA 270 struct adb_request req; 271 int i; 272 273 for (i = 0; i < 3; ++i) { 274 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC, 275 0x50, i + 1, params[i]); 276 while (!req.complete) 277 cuda_poll(); 278 } 279 #endif 280 } 281 282 static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p) 283 { 284 p->sense = read_valkyrie_sense(p); 285 printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense); 286 287 /* Try to pick a video mode out of NVRAM if we have one. */ 288 #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM) 289 if (default_vmode == VMODE_NVRAM) { 290 default_vmode = nvram_read_byte(NV_VMODE); 291 if (default_vmode <= 0 292 || default_vmode > VMODE_MAX 293 || !valkyrie_reg_init[default_vmode - 1]) 294 default_vmode = VMODE_CHOOSE; 295 } 296 #endif 297 if (default_vmode == VMODE_CHOOSE) 298 default_vmode = mac_map_monitor_sense(p->sense); 299 if (!valkyrie_reg_init[default_vmode - 1]) 300 default_vmode = VMODE_640_480_67; 301 #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM) 302 if (default_cmode == CMODE_NVRAM) 303 default_cmode = nvram_read_byte(NV_CMODE); 304 #endif 305 306 /* 307 * Reduce the pixel size if we don't have enough VRAM or bandwidth. 308 */ 309 if (default_cmode < CMODE_8 || default_cmode > CMODE_16 310 || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0 311 || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram) 312 default_cmode = CMODE_8; 313 314 printk(KERN_INFO "using video mode %d and color mode %d.\n", 315 default_vmode, default_cmode); 316 } 317 318 int __init valkyriefb_init(void) 319 { 320 struct fb_info_valkyrie *p; 321 unsigned long frame_buffer_phys, cmap_regs_phys, flags; 322 int err; 323 char *option = NULL; 324 325 if (fb_get_options("valkyriefb", &option)) 326 return -ENODEV; 327 valkyriefb_setup(option); 328 329 #ifdef CONFIG_MAC 330 if (!MACH_IS_MAC) 331 return -ENODEV; 332 if (!(mac_bi_data.id == MAC_MODEL_Q630 333 /* I'm not sure about this one */ 334 || mac_bi_data.id == MAC_MODEL_P588)) 335 return -ENODEV; 336 337 /* Hardcoded addresses... welcome to 68k Macintosh country :-) */ 338 frame_buffer_phys = 0xf9000000; 339 cmap_regs_phys = 0x50f24000; 340 flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */ 341 #else /* ppc (!CONFIG_MAC) */ 342 { 343 struct device_node *dp; 344 struct resource r; 345 346 dp = of_find_node_by_name(NULL, "valkyrie"); 347 if (dp == 0) 348 return 0; 349 350 if (of_address_to_resource(dp, 0, &r)) { 351 printk(KERN_ERR "can't find address for valkyrie\n"); 352 return 0; 353 } 354 355 frame_buffer_phys = r.start; 356 cmap_regs_phys = r.start + 0x304000; 357 flags = _PAGE_WRITETHRU; 358 } 359 #endif /* ppc (!CONFIG_MAC) */ 360 361 p = kzalloc(sizeof(*p), GFP_ATOMIC); 362 if (p == 0) 363 return -ENOMEM; 364 365 /* Map in frame buffer and registers */ 366 if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) { 367 kfree(p); 368 return 0; 369 } 370 p->total_vram = 0x100000; 371 p->frame_buffer_phys = frame_buffer_phys; 372 p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags); 373 p->cmap_regs_phys = cmap_regs_phys; 374 p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000); 375 p->valkyrie_regs_phys = cmap_regs_phys+0x6000; 376 p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000); 377 err = -ENOMEM; 378 if (p->frame_buffer == NULL || p->cmap_regs == NULL 379 || p->valkyrie_regs == NULL) { 380 printk(KERN_ERR "valkyriefb: couldn't map resources\n"); 381 goto out_free; 382 } 383 384 valkyrie_choose_mode(p); 385 mac_vmode_to_var(default_vmode, default_cmode, &p->info.var); 386 err = valkyrie_init_info(&p->info, p); 387 if (err < 0) 388 goto out_free; 389 valkyrie_init_fix(&p->info.fix, p); 390 if (valkyriefb_set_par(&p->info)) 391 /* "can't happen" */ 392 printk(KERN_ERR "valkyriefb: can't set default video mode\n"); 393 394 if ((err = register_framebuffer(&p->info)) != 0) 395 goto out_cmap_free; 396 397 fb_info(&p->info, "valkyrie frame buffer device\n"); 398 return 0; 399 400 out_cmap_free: 401 fb_dealloc_cmap(&p->info.cmap); 402 out_free: 403 if (p->frame_buffer) 404 iounmap(p->frame_buffer); 405 if (p->cmap_regs) 406 iounmap(p->cmap_regs); 407 if (p->valkyrie_regs) 408 iounmap(p->valkyrie_regs); 409 kfree(p); 410 return err; 411 } 412 413 /* 414 * Get the monitor sense value. 415 */ 416 static int read_valkyrie_sense(struct fb_info_valkyrie *p) 417 { 418 int sense, in; 419 420 out_8(&p->valkyrie_regs->msense.r, 0); /* release all lines */ 421 __delay(20000); 422 sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4; 423 /* drive each sense line low in turn and collect the other 2 */ 424 out_8(&p->valkyrie_regs->msense.r, 4); /* drive A low */ 425 __delay(20000); 426 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30); 427 out_8(&p->valkyrie_regs->msense.r, 2); /* drive B low */ 428 __delay(20000); 429 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3; 430 sense |= (in & 0x10) >> 2; 431 out_8(&p->valkyrie_regs->msense.r, 1); /* drive C low */ 432 __delay(20000); 433 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5; 434 435 out_8(&p->valkyrie_regs->msense.r, 7); 436 437 return sense; 438 } 439 440 /* 441 * This routine takes a user-supplied var, 442 * and picks the best vmode/cmode from it. 443 */ 444 445 /* [bkn] I did a major overhaul of this function. 446 * 447 * Much of the old code was "swiped by jonh from atyfb.c". Because 448 * macmodes has mac_var_to_vmode, I felt that it would be better to 449 * rework this function to use that, instead of reinventing the wheel to 450 * add support for vmode 17. This was reinforced by the fact that 451 * the previously swiped atyfb.c code is no longer there. 452 * 453 * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing 454 * most, but not all, of the old code in the process. One side benefit of 455 * swiping the platinumfb code is that we now have more comprehensible error 456 * messages when a vmode/cmode switch fails. (Most of the error messages are 457 * platinumfb.c, but I added two of my own, and I also changed some commas 458 * into colons to make the messages more consistent with other Linux error 459 * messages.) In addition, I think the new code *might* fix some vmode- 460 * switching oddities, but I'm not sure. 461 * 462 * There may be some more opportunities for cleanup in here, but this is a 463 * good start... 464 */ 465 466 static int valkyrie_var_to_par(struct fb_var_screeninfo *var, 467 struct fb_par_valkyrie *par, const struct fb_info *fb_info) 468 { 469 int vmode, cmode; 470 struct valkyrie_regvals *init; 471 struct fb_info_valkyrie *p = 472 container_of(fb_info, struct fb_info_valkyrie, info); 473 474 if (mac_var_to_vmode(var, &vmode, &cmode) != 0) { 475 printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n", 476 var->xres, var->yres, var->bits_per_pixel); 477 return -EINVAL; 478 } 479 480 /* Check if we know about the wanted video mode */ 481 if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) { 482 printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode); 483 return -EINVAL; 484 } 485 486 if (cmode != CMODE_8 && cmode != CMODE_16) { 487 printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode); 488 return -EINVAL; 489 } 490 491 if (var->xres_virtual > var->xres || var->yres_virtual > var->yres 492 || var->xoffset != 0 || var->yoffset != 0) { 493 return -EINVAL; 494 } 495 496 init = valkyrie_reg_init[vmode-1]; 497 if (init->pitch[cmode] == 0) { 498 printk(KERN_ERR "valkyriefb: vmode %d does not support " 499 "cmode %d.\n", vmode, cmode); 500 return -EINVAL; 501 } 502 503 if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) { 504 printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, " 505 "cmode %d.\n", vmode, cmode); 506 return -EINVAL; 507 } 508 509 par->vmode = vmode; 510 par->cmode = cmode; 511 par->init = init; 512 par->xres = var->xres; 513 par->yres = var->yres; 514 par->vxres = par->xres; 515 par->vyres = par->yres; 516 517 return 0; 518 } 519 520 static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p) 521 { 522 memset(fix, 0, sizeof(*fix)); 523 strcpy(fix->id, "valkyrie"); 524 fix->mmio_start = p->valkyrie_regs_phys; 525 fix->mmio_len = sizeof(struct valkyrie_regs); 526 fix->type = FB_TYPE_PACKED_PIXELS; 527 fix->smem_start = p->frame_buffer_phys + 0x1000; 528 fix->smem_len = p->total_vram; 529 530 fix->type_aux = 0; 531 fix->ywrapstep = 0; 532 fix->ypanstep = 0; 533 fix->xpanstep = 0; 534 535 } 536 537 /* Fix must already be inited above */ 538 static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, 539 struct fb_fix_screeninfo *fix) 540 { 541 fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode); 542 fix->visual = (par->cmode == CMODE_8) ? 543 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR; 544 fix->line_length = par->vxres << par->cmode; 545 /* ywrapstep, xpanstep, ypanstep */ 546 } 547 548 static int __init valkyrie_init_info(struct fb_info *info, 549 struct fb_info_valkyrie *p) 550 { 551 info->fbops = &valkyriefb_ops; 552 info->screen_base = p->frame_buffer + 0x1000; 553 info->flags = FBINFO_DEFAULT; 554 info->pseudo_palette = p->pseudo_palette; 555 info->par = &p->par; 556 return fb_alloc_cmap(&info->cmap, 256, 0); 557 } 558 559 560 /* 561 * Parse user specified options (`video=valkyriefb:') 562 */ 563 int __init valkyriefb_setup(char *options) 564 { 565 char *this_opt; 566 567 if (!options || !*options) 568 return 0; 569 570 while ((this_opt = strsep(&options, ",")) != NULL) { 571 if (!strncmp(this_opt, "vmode:", 6)) { 572 int vmode = simple_strtoul(this_opt+6, NULL, 0); 573 if (vmode > 0 && vmode <= VMODE_MAX) 574 default_vmode = vmode; 575 } 576 else if (!strncmp(this_opt, "cmode:", 6)) { 577 int depth = simple_strtoul(this_opt+6, NULL, 0); 578 switch (depth) { 579 case 8: 580 default_cmode = CMODE_8; 581 break; 582 case 15: 583 case 16: 584 default_cmode = CMODE_16; 585 break; 586 } 587 } 588 } 589 return 0; 590 } 591 592 module_init(valkyriefb_init); 593 MODULE_LICENSE("GPL"); 594