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