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/bootinfo.h> 60#include <asm/macintosh.h> 61#else 62#include <asm/prom.h> 63#endif 64#include <asm/pgtable.h> 65 66#include "macmodes.h" 67#include "valkyriefb.h" 68 69#ifdef CONFIG_MAC 70/* We don't yet have functions to read the PRAM... perhaps we can 71 adapt them from the PPC code? */ 72static int default_vmode = VMODE_640_480_67; 73static int default_cmode = CMODE_8; 74#else 75static int default_vmode = VMODE_NVRAM; 76static int default_cmode = CMODE_NVRAM; 77#endif 78 79struct fb_par_valkyrie { 80 int vmode, cmode; 81 int xres, yres; 82 int vxres, vyres; 83 struct valkyrie_regvals *init; 84}; 85 86struct fb_info_valkyrie { 87 struct fb_info info; 88 struct fb_par_valkyrie par; 89 struct cmap_regs __iomem *cmap_regs; 90 unsigned long cmap_regs_phys; 91 92 struct valkyrie_regs __iomem *valkyrie_regs; 93 unsigned long valkyrie_regs_phys; 94 95 __u8 __iomem *frame_buffer; 96 unsigned long frame_buffer_phys; 97 98 int sense; 99 unsigned long total_vram; 100 101 u32 pseudo_palette[16]; 102}; 103 104/* 105 * Exported functions 106 */ 107int valkyriefb_init(void); 108int valkyriefb_setup(char*); 109 110static int valkyriefb_check_var(struct fb_var_screeninfo *var, 111 struct fb_info *info); 112static int valkyriefb_set_par(struct fb_info *info); 113static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 114 u_int transp, struct fb_info *info); 115static int valkyriefb_blank(int blank_mode, struct fb_info *info); 116 117static int read_valkyrie_sense(struct fb_info_valkyrie *p); 118static void set_valkyrie_clock(unsigned char *params); 119static int valkyrie_var_to_par(struct fb_var_screeninfo *var, 120 struct fb_par_valkyrie *par, const struct fb_info *fb_info); 121 122static void valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p); 123static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix); 124static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p); 125 126static struct fb_ops valkyriefb_ops = { 127 .owner = THIS_MODULE, 128 .fb_check_var = valkyriefb_check_var, 129 .fb_set_par = valkyriefb_set_par, 130 .fb_setcolreg = valkyriefb_setcolreg, 131 .fb_blank = valkyriefb_blank, 132 .fb_fillrect = cfb_fillrect, 133 .fb_copyarea = cfb_copyarea, 134 .fb_imageblit = cfb_imageblit, 135}; 136 137/* Sets the video mode according to info->var */ 138static int valkyriefb_set_par(struct fb_info *info) 139{ 140 struct fb_info_valkyrie *p = (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 168static 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 174static int 175valkyriefb_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 */ 196static int valkyriefb_blank(int blank_mode, struct fb_info *info) 197{ 198 struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info; 199 struct fb_par_valkyrie *par = info->par; 200 struct valkyrie_regvals *init = par->init; 201 202 if (init == NULL) 203 return 1; 204 205 switch (blank_mode) { 206 case FB_BLANK_UNBLANK: /* unblank */ 207 out_8(&p->valkyrie_regs->mode.r, init->mode); 208 break; 209 case FB_BLANK_NORMAL: 210 return 1; /* get caller to set CLUT to all black */ 211 case FB_BLANK_VSYNC_SUSPEND: 212 case FB_BLANK_HSYNC_SUSPEND: 213 /* 214 * [kps] Value extracted from MacOS. I don't know 215 * whether this bit disables hsync or vsync, or 216 * whether the hardware can do the other as well. 217 */ 218 out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40); 219 break; 220 case FB_BLANK_POWERDOWN: 221 out_8(&p->valkyrie_regs->mode.r, 0x66); 222 break; 223 } 224 return 0; 225} 226 227static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 228 u_int transp, struct fb_info *info) 229{ 230 struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info; 231 volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs; 232 struct fb_par_valkyrie *par = info->par; 233 234 if (regno > 255) 235 return 1; 236 red >>= 8; 237 green >>= 8; 238 blue >>= 8; 239 240 /* tell clut which address to fill */ 241 out_8(&p->cmap_regs->addr, regno); 242 udelay(1); 243 /* send one color channel at a time */ 244 out_8(&cmap_regs->lut, red); 245 out_8(&cmap_regs->lut, green); 246 out_8(&cmap_regs->lut, blue); 247 248 if (regno < 16 && par->cmode == CMODE_16) 249 ((u32 *)info->pseudo_palette)[regno] = 250 (regno << 10) | (regno << 5) | regno; 251 252 return 0; 253} 254 255static inline int valkyrie_vram_reqd(int video_mode, int color_mode) 256{ 257 int pitch; 258 struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1]; 259 260 if ((pitch = init->pitch[color_mode]) == 0) 261 pitch = 2 * init->pitch[0]; 262 return init->vres * pitch; 263} 264 265static void set_valkyrie_clock(unsigned char *params) 266{ 267 struct adb_request req; 268 int i; 269 270#ifdef CONFIG_ADB_CUDA 271 for (i = 0; i < 3; ++i) { 272 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC, 273 0x50, i + 1, params[i]); 274 while (!req.complete) 275 cuda_poll(); 276 } 277#endif 278} 279 280static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p) 281{ 282 p->sense = read_valkyrie_sense(p); 283 printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense); 284 285 /* Try to pick a video mode out of NVRAM if we have one. */ 286#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM) 287 if (default_vmode == VMODE_NVRAM) { 288 default_vmode = nvram_read_byte(NV_VMODE); 289 if (default_vmode <= 0 290 || default_vmode > VMODE_MAX 291 || !valkyrie_reg_init[default_vmode - 1]) 292 default_vmode = VMODE_CHOOSE; 293 } 294#endif 295 if (default_vmode == VMODE_CHOOSE) 296 default_vmode = mac_map_monitor_sense(p->sense); 297 if (!valkyrie_reg_init[default_vmode - 1]) 298 default_vmode = VMODE_640_480_67; 299#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM) 300 if (default_cmode == CMODE_NVRAM) 301 default_cmode = nvram_read_byte(NV_CMODE); 302#endif 303 304 /* 305 * Reduce the pixel size if we don't have enough VRAM or bandwidth. 306 */ 307 if (default_cmode < CMODE_8 || default_cmode > CMODE_16 308 || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0 309 || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram) 310 default_cmode = CMODE_8; 311 312 printk(KERN_INFO "using video mode %d and color mode %d.\n", 313 default_vmode, default_cmode); 314} 315 316int __init valkyriefb_init(void) 317{ 318 struct fb_info_valkyrie *p; 319 unsigned long frame_buffer_phys, cmap_regs_phys, flags; 320 int err; 321 char *option = NULL; 322 323 if (fb_get_options("valkyriefb", &option)) 324 return -ENODEV; 325 valkyriefb_setup(option); 326 327#ifdef CONFIG_MAC 328 if (!MACH_IS_MAC) 329 return 0; 330 if (!(mac_bi_data.id == MAC_MODEL_Q630 331 /* I'm not sure about this one */ 332 || mac_bi_data.id == MAC_MODEL_P588)) 333 return 0; 334 335 /* Hardcoded addresses... welcome to 68k Macintosh country :-) */ 336 frame_buffer_phys = 0xf9000000; 337 cmap_regs_phys = 0x50f24000; 338 flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */ 339#else /* ppc (!CONFIG_MAC) */ 340 { 341 struct device_node *dp; 342 struct resource r; 343 344 dp = of_find_node_by_name(NULL, "valkyrie"); 345 if (dp == 0) 346 return 0; 347 348 if (of_address_to_resource(dp, 0, &r)) { 349 printk(KERN_ERR "can't find address for valkyrie\n"); 350 return 0; 351 } 352 353 frame_buffer_phys = r.start; 354 cmap_regs_phys = r.start + 0x304000; 355 flags = _PAGE_WRITETHRU; 356 } 357#endif /* ppc (!CONFIG_MAC) */ 358 359 p = kmalloc(sizeof(*p), GFP_ATOMIC); 360 if (p == 0) 361 return -ENOMEM; 362 memset(p, 0, sizeof(*p)); 363 364 /* Map in frame buffer and registers */ 365 if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) { 366 kfree(p); 367 return 0; 368 } 369 p->total_vram = 0x100000; 370 p->frame_buffer_phys = frame_buffer_phys; 371 p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags); 372 p->cmap_regs_phys = cmap_regs_phys; 373 p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000); 374 p->valkyrie_regs_phys = cmap_regs_phys+0x6000; 375 p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000); 376 err = -ENOMEM; 377 if (p->frame_buffer == NULL || p->cmap_regs == NULL 378 || p->valkyrie_regs == NULL) { 379 printk(KERN_ERR "valkyriefb: couldn't map resources\n"); 380 goto out_free; 381 } 382 383 valkyrie_choose_mode(p); 384 mac_vmode_to_var(default_vmode, default_cmode, &p->info.var); 385 valkyrie_init_info(&p->info, p); 386 valkyrie_init_fix(&p->info.fix, p); 387 if (valkyriefb_set_par(&p->info)) 388 /* "can't happen" */ 389 printk(KERN_ERR "valkyriefb: can't set default video mode\n"); 390 391 if ((err = register_framebuffer(&p->info)) != 0) 392 goto out_free; 393 394 printk(KERN_INFO "fb%d: valkyrie frame buffer device\n", p->info.node); 395 return 0; 396 397 out_free: 398 if (p->frame_buffer) 399 iounmap(p->frame_buffer); 400 if (p->cmap_regs) 401 iounmap(p->cmap_regs); 402 if (p->valkyrie_regs) 403 iounmap(p->valkyrie_regs); 404 kfree(p); 405 return err; 406} 407 408/* 409 * Get the monitor sense value. 410 */ 411static int read_valkyrie_sense(struct fb_info_valkyrie *p) 412{ 413 int sense, in; 414 415 out_8(&p->valkyrie_regs->msense.r, 0); /* release all lines */ 416 __delay(20000); 417 sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4; 418 /* drive each sense line low in turn and collect the other 2 */ 419 out_8(&p->valkyrie_regs->msense.r, 4); /* drive A low */ 420 __delay(20000); 421 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30); 422 out_8(&p->valkyrie_regs->msense.r, 2); /* drive B low */ 423 __delay(20000); 424 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3; 425 sense |= (in & 0x10) >> 2; 426 out_8(&p->valkyrie_regs->msense.r, 1); /* drive C low */ 427 __delay(20000); 428 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5; 429 430 out_8(&p->valkyrie_regs->msense.r, 7); 431 432 return sense; 433} 434 435/* 436 * This routine takes a user-supplied var, 437 * and picks the best vmode/cmode from it. 438 */ 439 440/* [bkn] I did a major overhaul of this function. 441 * 442 * Much of the old code was "swiped by jonh from atyfb.c". Because 443 * macmodes has mac_var_to_vmode, I felt that it would be better to 444 * rework this function to use that, instead of reinventing the wheel to 445 * add support for vmode 17. This was reinforced by the fact that 446 * the previously swiped atyfb.c code is no longer there. 447 * 448 * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing 449 * most, but not all, of the old code in the process. One side benefit of 450 * swiping the platinumfb code is that we now have more comprehensible error 451 * messages when a vmode/cmode switch fails. (Most of the error messages are 452 * platinumfb.c, but I added two of my own, and I also changed some commas 453 * into colons to make the messages more consistent with other Linux error 454 * messages.) In addition, I think the new code *might* fix some vmode- 455 * switching oddities, but I'm not sure. 456 * 457 * There may be some more opportunities for cleanup in here, but this is a 458 * good start... 459 */ 460 461static int valkyrie_var_to_par(struct fb_var_screeninfo *var, 462 struct fb_par_valkyrie *par, const struct fb_info *fb_info) 463{ 464 int vmode, cmode; 465 struct valkyrie_regvals *init; 466 struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) fb_info; 467 468 if (mac_var_to_vmode(var, &vmode, &cmode) != 0) { 469 printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n", 470 var->xres, var->yres, var->bits_per_pixel); 471 return -EINVAL; 472 } 473 474 /* Check if we know about the wanted video mode */ 475 if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) { 476 printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode); 477 return -EINVAL; 478 } 479 480 if (cmode != CMODE_8 && cmode != CMODE_16) { 481 printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode); 482 return -EINVAL; 483 } 484 485 if (var->xres_virtual > var->xres || var->yres_virtual > var->yres 486 || var->xoffset != 0 || var->yoffset != 0) { 487 return -EINVAL; 488 } 489 490 init = valkyrie_reg_init[vmode-1]; 491 if (init->pitch[cmode] == 0) { 492 printk(KERN_ERR "valkyriefb: vmode %d does not support " 493 "cmode %d.\n", vmode, cmode); 494 return -EINVAL; 495 } 496 497 if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) { 498 printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, " 499 "cmode %d.\n", vmode, cmode); 500 return -EINVAL; 501 } 502 503 par->vmode = vmode; 504 par->cmode = cmode; 505 par->init = init; 506 par->xres = var->xres; 507 par->yres = var->yres; 508 par->vxres = par->xres; 509 par->vyres = par->yres; 510 511 return 0; 512} 513 514static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p) 515{ 516 memset(fix, 0, sizeof(*fix)); 517 strcpy(fix->id, "valkyrie"); 518 fix->mmio_start = p->valkyrie_regs_phys; 519 fix->mmio_len = sizeof(struct valkyrie_regs); 520 fix->type = FB_TYPE_PACKED_PIXELS; 521 fix->smem_start = p->frame_buffer_phys + 0x1000; 522 fix->smem_len = p->total_vram; 523 524 fix->type_aux = 0; 525 fix->ywrapstep = 0; 526 fix->ypanstep = 0; 527 fix->xpanstep = 0; 528 529} 530 531/* Fix must already be inited above */ 532static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, 533 struct fb_fix_screeninfo *fix) 534{ 535 fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode); 536 fix->visual = (par->cmode == CMODE_8) ? 537 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR; 538 fix->line_length = par->vxres << par->cmode; 539 /* ywrapstep, xpanstep, ypanstep */ 540} 541 542static void __init valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p) 543{ 544 info->fbops = &valkyriefb_ops; 545 info->screen_base = p->frame_buffer + 0x1000; 546 info->flags = FBINFO_DEFAULT; 547 info->pseudo_palette = p->pseudo_palette; 548 fb_alloc_cmap(&info->cmap, 256, 0); 549 info->par = &p->par; 550} 551 552 553/* 554 * Parse user speficied options (`video=valkyriefb:') 555 */ 556int __init valkyriefb_setup(char *options) 557{ 558 char *this_opt; 559 560 if (!options || !*options) 561 return 0; 562 563 while ((this_opt = strsep(&options, ",")) != NULL) { 564 if (!strncmp(this_opt, "vmode:", 6)) { 565 int vmode = simple_strtoul(this_opt+6, NULL, 0); 566 if (vmode > 0 && vmode <= VMODE_MAX) 567 default_vmode = vmode; 568 } 569 else if (!strncmp(this_opt, "cmode:", 6)) { 570 int depth = simple_strtoul(this_opt+6, NULL, 0); 571 switch (depth) { 572 case 8: 573 default_cmode = CMODE_8; 574 break; 575 case 15: 576 case 16: 577 default_cmode = CMODE_16; 578 break; 579 } 580 } 581 } 582 return 0; 583} 584 585module_init(valkyriefb_init); 586MODULE_LICENSE("GPL"); 587