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