1 /* 2 * SGI GBE frame buffer driver 3 * 4 * Copyright (C) 1999 Silicon Graphics, Inc. - Jeffrey Newquist 5 * Copyright (C) 2002 Vivien Chappelier <vivien.chappelier@linux-mips.org> 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file COPYING in the main directory of this archive for 9 * more details. 10 */ 11 12 #include <linux/delay.h> 13 #include <linux/platform_device.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/errno.h> 16 #include <linux/gfp.h> 17 #include <linux/fb.h> 18 #include <linux/init.h> 19 #include <linux/interrupt.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/module.h> 23 #include <linux/io.h> 24 25 #ifdef CONFIG_MIPS 26 #include <asm/addrspace.h> 27 #endif 28 #include <asm/byteorder.h> 29 #include <asm/tlbflush.h> 30 31 #include <video/gbe.h> 32 33 static struct sgi_gbe *gbe; 34 35 struct gbefb_par { 36 struct fb_var_screeninfo var; 37 struct gbe_timing_info timing; 38 int wc_cookie; 39 int valid; 40 }; 41 42 #ifdef CONFIG_SGI_IP32 43 #define GBE_BASE 0x16000000 /* SGI O2 */ 44 #endif 45 46 /* macro for fastest write-though access to the framebuffer */ 47 #ifdef CONFIG_MIPS 48 #ifdef CONFIG_CPU_R10000 49 #define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_UNCACHED_ACCELERATED) 50 #else 51 #define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_CACHABLE_NO_WA) 52 #endif 53 #endif 54 #ifdef CONFIG_X86 55 #define pgprot_fb(_prot) (((_prot) & ~_PAGE_CACHE_MASK) | \ 56 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS)) 57 #endif 58 59 /* 60 * RAM we reserve for the frame buffer. This defines the maximum screen 61 * size 62 */ 63 #if CONFIG_FB_GBE_MEM > 8 64 #error GBE Framebuffer cannot use more than 8MB of memory 65 #endif 66 67 #define TILE_SHIFT 16 68 #define TILE_SIZE (1 << TILE_SHIFT) 69 #define TILE_MASK (TILE_SIZE - 1) 70 71 static unsigned int gbe_mem_size = CONFIG_FB_GBE_MEM * 1024*1024; 72 static void *gbe_mem; 73 static dma_addr_t gbe_dma_addr; 74 static unsigned long gbe_mem_phys; 75 76 static struct { 77 uint16_t *cpu; 78 dma_addr_t dma; 79 } gbe_tiles; 80 81 static int gbe_revision; 82 83 static int ypan, ywrap; 84 85 static uint32_t pseudo_palette[16]; 86 static uint32_t gbe_cmap[256]; 87 static int gbe_turned_on; /* 0 turned off, 1 turned on */ 88 89 static char *mode_option = NULL; 90 91 /* default CRT mode */ 92 static struct fb_var_screeninfo default_var_CRT = { 93 /* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */ 94 .xres = 640, 95 .yres = 480, 96 .xres_virtual = 640, 97 .yres_virtual = 480, 98 .xoffset = 0, 99 .yoffset = 0, 100 .bits_per_pixel = 8, 101 .grayscale = 0, 102 .red = { 0, 8, 0 }, 103 .green = { 0, 8, 0 }, 104 .blue = { 0, 8, 0 }, 105 .transp = { 0, 0, 0 }, 106 .nonstd = 0, 107 .activate = 0, 108 .height = -1, 109 .width = -1, 110 .accel_flags = 0, 111 .pixclock = 39722, /* picoseconds */ 112 .left_margin = 48, 113 .right_margin = 16, 114 .upper_margin = 33, 115 .lower_margin = 10, 116 .hsync_len = 96, 117 .vsync_len = 2, 118 .sync = 0, 119 .vmode = FB_VMODE_NONINTERLACED, 120 }; 121 122 /* default LCD mode */ 123 static struct fb_var_screeninfo default_var_LCD = { 124 /* 1600x1024, 8 bpp */ 125 .xres = 1600, 126 .yres = 1024, 127 .xres_virtual = 1600, 128 .yres_virtual = 1024, 129 .xoffset = 0, 130 .yoffset = 0, 131 .bits_per_pixel = 8, 132 .grayscale = 0, 133 .red = { 0, 8, 0 }, 134 .green = { 0, 8, 0 }, 135 .blue = { 0, 8, 0 }, 136 .transp = { 0, 0, 0 }, 137 .nonstd = 0, 138 .activate = 0, 139 .height = -1, 140 .width = -1, 141 .accel_flags = 0, 142 .pixclock = 9353, 143 .left_margin = 20, 144 .right_margin = 30, 145 .upper_margin = 37, 146 .lower_margin = 3, 147 .hsync_len = 20, 148 .vsync_len = 3, 149 .sync = 0, 150 .vmode = FB_VMODE_NONINTERLACED 151 }; 152 153 /* default modedb mode */ 154 /* 640x480, 60 Hz, Non-Interlaced (25.172 MHz dotclock) */ 155 static struct fb_videomode default_mode_CRT = { 156 .refresh = 60, 157 .xres = 640, 158 .yres = 480, 159 .pixclock = 39722, 160 .left_margin = 48, 161 .right_margin = 16, 162 .upper_margin = 33, 163 .lower_margin = 10, 164 .hsync_len = 96, 165 .vsync_len = 2, 166 .sync = 0, 167 .vmode = FB_VMODE_NONINTERLACED, 168 }; 169 /* 1600x1024 SGI flatpanel 1600sw */ 170 static struct fb_videomode default_mode_LCD = { 171 /* 1600x1024, 8 bpp */ 172 .xres = 1600, 173 .yres = 1024, 174 .pixclock = 9353, 175 .left_margin = 20, 176 .right_margin = 30, 177 .upper_margin = 37, 178 .lower_margin = 3, 179 .hsync_len = 20, 180 .vsync_len = 3, 181 .vmode = FB_VMODE_NONINTERLACED, 182 }; 183 184 static struct fb_videomode *default_mode = &default_mode_CRT; 185 static struct fb_var_screeninfo *default_var = &default_var_CRT; 186 187 static int flat_panel_enabled = 0; 188 189 static void gbe_reset(void) 190 { 191 /* Turn on dotclock PLL */ 192 gbe->ctrlstat = 0x300aa000; 193 } 194 195 196 /* 197 * Function: gbe_turn_off 198 * Parameters: (None) 199 * Description: This should turn off the monitor and gbe. This is used 200 * when switching between the serial console and the graphics 201 * console. 202 */ 203 204 static void gbe_turn_off(void) 205 { 206 int i; 207 unsigned int val, x, y, vpixen_off; 208 209 gbe_turned_on = 0; 210 211 /* check if pixel counter is on */ 212 val = gbe->vt_xy; 213 if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 1) 214 return; 215 216 /* turn off DMA */ 217 val = gbe->ovr_control; 218 SET_GBE_FIELD(OVR_CONTROL, OVR_DMA_ENABLE, val, 0); 219 gbe->ovr_control = val; 220 udelay(1000); 221 val = gbe->frm_control; 222 SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 0); 223 gbe->frm_control = val; 224 udelay(1000); 225 val = gbe->did_control; 226 SET_GBE_FIELD(DID_CONTROL, DID_DMA_ENABLE, val, 0); 227 gbe->did_control = val; 228 udelay(1000); 229 230 /* We have to wait through two vertical retrace periods before 231 * the pixel DMA is turned off for sure. */ 232 for (i = 0; i < 10000; i++) { 233 val = gbe->frm_inhwctrl; 234 if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val)) { 235 udelay(10); 236 } else { 237 val = gbe->ovr_inhwctrl; 238 if (GET_GBE_FIELD(OVR_INHWCTRL, OVR_DMA_ENABLE, val)) { 239 udelay(10); 240 } else { 241 val = gbe->did_inhwctrl; 242 if (GET_GBE_FIELD(DID_INHWCTRL, DID_DMA_ENABLE, val)) { 243 udelay(10); 244 } else 245 break; 246 } 247 } 248 } 249 if (i == 10000) 250 printk(KERN_ERR "gbefb: turn off DMA timed out\n"); 251 252 /* wait for vpixen_off */ 253 val = gbe->vt_vpixen; 254 vpixen_off = GET_GBE_FIELD(VT_VPIXEN, VPIXEN_OFF, val); 255 256 for (i = 0; i < 100000; i++) { 257 val = gbe->vt_xy; 258 x = GET_GBE_FIELD(VT_XY, X, val); 259 y = GET_GBE_FIELD(VT_XY, Y, val); 260 if (y < vpixen_off) 261 break; 262 udelay(1); 263 } 264 if (i == 100000) 265 printk(KERN_ERR 266 "gbefb: wait for vpixen_off timed out\n"); 267 for (i = 0; i < 10000; i++) { 268 val = gbe->vt_xy; 269 x = GET_GBE_FIELD(VT_XY, X, val); 270 y = GET_GBE_FIELD(VT_XY, Y, val); 271 if (y > vpixen_off) 272 break; 273 udelay(1); 274 } 275 if (i == 10000) 276 printk(KERN_ERR "gbefb: wait for vpixen_off timed out\n"); 277 278 /* turn off pixel counter */ 279 val = 0; 280 SET_GBE_FIELD(VT_XY, FREEZE, val, 1); 281 gbe->vt_xy = val; 282 udelay(10000); 283 for (i = 0; i < 10000; i++) { 284 val = gbe->vt_xy; 285 if (GET_GBE_FIELD(VT_XY, FREEZE, val) != 1) 286 udelay(10); 287 else 288 break; 289 } 290 if (i == 10000) 291 printk(KERN_ERR "gbefb: turn off pixel clock timed out\n"); 292 293 /* turn off dot clock */ 294 val = gbe->dotclock; 295 SET_GBE_FIELD(DOTCLK, RUN, val, 0); 296 gbe->dotclock = val; 297 udelay(10000); 298 for (i = 0; i < 10000; i++) { 299 val = gbe->dotclock; 300 if (GET_GBE_FIELD(DOTCLK, RUN, val)) 301 udelay(10); 302 else 303 break; 304 } 305 if (i == 10000) 306 printk(KERN_ERR "gbefb: turn off dotclock timed out\n"); 307 308 /* reset the frame DMA FIFO */ 309 val = gbe->frm_size_tile; 310 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 1); 311 gbe->frm_size_tile = val; 312 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 0); 313 gbe->frm_size_tile = val; 314 } 315 316 static void gbe_turn_on(void) 317 { 318 unsigned int val, i; 319 320 /* 321 * Check if pixel counter is off, for unknown reason this 322 * code hangs Visual Workstations 323 */ 324 if (gbe_revision < 2) { 325 val = gbe->vt_xy; 326 if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 0) 327 return; 328 } 329 330 /* turn on dot clock */ 331 val = gbe->dotclock; 332 SET_GBE_FIELD(DOTCLK, RUN, val, 1); 333 gbe->dotclock = val; 334 udelay(10000); 335 for (i = 0; i < 10000; i++) { 336 val = gbe->dotclock; 337 if (GET_GBE_FIELD(DOTCLK, RUN, val) != 1) 338 udelay(10); 339 else 340 break; 341 } 342 if (i == 10000) 343 printk(KERN_ERR "gbefb: turn on dotclock timed out\n"); 344 345 /* turn on pixel counter */ 346 val = 0; 347 SET_GBE_FIELD(VT_XY, FREEZE, val, 0); 348 gbe->vt_xy = val; 349 udelay(10000); 350 for (i = 0; i < 10000; i++) { 351 val = gbe->vt_xy; 352 if (GET_GBE_FIELD(VT_XY, FREEZE, val)) 353 udelay(10); 354 else 355 break; 356 } 357 if (i == 10000) 358 printk(KERN_ERR "gbefb: turn on pixel clock timed out\n"); 359 360 /* turn on DMA */ 361 val = gbe->frm_control; 362 SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 1); 363 gbe->frm_control = val; 364 udelay(1000); 365 for (i = 0; i < 10000; i++) { 366 val = gbe->frm_inhwctrl; 367 if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val) != 1) 368 udelay(10); 369 else 370 break; 371 } 372 if (i == 10000) 373 printk(KERN_ERR "gbefb: turn on DMA timed out\n"); 374 375 gbe_turned_on = 1; 376 } 377 378 static void gbe_loadcmap(void) 379 { 380 int i, j; 381 382 for (i = 0; i < 256; i++) { 383 for (j = 0; j < 1000 && gbe->cm_fifo >= 63; j++) 384 udelay(10); 385 if (j == 1000) 386 printk(KERN_ERR "gbefb: cmap FIFO timeout\n"); 387 388 gbe->cmap[i] = gbe_cmap[i]; 389 } 390 } 391 392 /* 393 * Blank the display. 394 */ 395 static int gbefb_blank(int blank, struct fb_info *info) 396 { 397 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */ 398 switch (blank) { 399 case FB_BLANK_UNBLANK: /* unblank */ 400 gbe_turn_on(); 401 gbe_loadcmap(); 402 break; 403 404 case FB_BLANK_NORMAL: /* blank */ 405 gbe_turn_off(); 406 break; 407 408 default: 409 /* Nothing */ 410 break; 411 } 412 return 0; 413 } 414 415 /* 416 * Setup flatpanel related registers. 417 */ 418 static void gbefb_setup_flatpanel(struct gbe_timing_info *timing) 419 { 420 int fp_wid, fp_hgt, fp_vbs, fp_vbe; 421 u32 outputVal = 0; 422 423 SET_GBE_FIELD(VT_FLAGS, HDRV_INVERT, outputVal, 424 (timing->flags & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1); 425 SET_GBE_FIELD(VT_FLAGS, VDRV_INVERT, outputVal, 426 (timing->flags & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1); 427 gbe->vt_flags = outputVal; 428 429 /* Turn on the flat panel */ 430 fp_wid = 1600; 431 fp_hgt = 1024; 432 fp_vbs = 0; 433 fp_vbe = 1600; 434 timing->pll_m = 4; 435 timing->pll_n = 1; 436 timing->pll_p = 0; 437 438 outputVal = 0; 439 SET_GBE_FIELD(FP_DE, ON, outputVal, fp_vbs); 440 SET_GBE_FIELD(FP_DE, OFF, outputVal, fp_vbe); 441 gbe->fp_de = outputVal; 442 outputVal = 0; 443 SET_GBE_FIELD(FP_HDRV, OFF, outputVal, fp_wid); 444 gbe->fp_hdrv = outputVal; 445 outputVal = 0; 446 SET_GBE_FIELD(FP_VDRV, ON, outputVal, 1); 447 SET_GBE_FIELD(FP_VDRV, OFF, outputVal, fp_hgt + 1); 448 gbe->fp_vdrv = outputVal; 449 } 450 451 struct gbe_pll_info { 452 int clock_rate; 453 int fvco_min; 454 int fvco_max; 455 }; 456 457 static struct gbe_pll_info gbe_pll_table[2] = { 458 { 20, 80, 220 }, 459 { 27, 80, 220 }, 460 }; 461 462 static int compute_gbe_timing(struct fb_var_screeninfo *var, 463 struct gbe_timing_info *timing) 464 { 465 int pll_m, pll_n, pll_p, error, best_m, best_n, best_p, best_error; 466 int pixclock; 467 struct gbe_pll_info *gbe_pll; 468 469 if (gbe_revision < 2) 470 gbe_pll = &gbe_pll_table[0]; 471 else 472 gbe_pll = &gbe_pll_table[1]; 473 474 /* Determine valid resolution and timing 475 * GBE crystal runs at 20Mhz or 27Mhz 476 * pll_m, pll_n, pll_p define the following frequencies 477 * fvco = pll_m * 20Mhz / pll_n 478 * fout = fvco / (2**pll_p) */ 479 best_error = 1000000000; 480 best_n = best_m = best_p = 0; 481 for (pll_p = 0; pll_p < 4; pll_p++) 482 for (pll_m = 1; pll_m < 256; pll_m++) 483 for (pll_n = 1; pll_n < 64; pll_n++) { 484 pixclock = (1000000 / gbe_pll->clock_rate) * 485 (pll_n << pll_p) / pll_m; 486 487 error = var->pixclock - pixclock; 488 489 if (error < 0) 490 error = -error; 491 492 if (error < best_error && 493 pll_m / pll_n > 494 gbe_pll->fvco_min / gbe_pll->clock_rate && 495 pll_m / pll_n < 496 gbe_pll->fvco_max / gbe_pll->clock_rate) { 497 best_error = error; 498 best_m = pll_m; 499 best_n = pll_n; 500 best_p = pll_p; 501 } 502 } 503 504 if (!best_n || !best_m) 505 return -EINVAL; /* Resolution to high */ 506 507 pixclock = (1000000 / gbe_pll->clock_rate) * 508 (best_n << best_p) / best_m; 509 510 /* set video timing information */ 511 if (timing) { 512 timing->width = var->xres; 513 timing->height = var->yres; 514 timing->pll_m = best_m; 515 timing->pll_n = best_n; 516 timing->pll_p = best_p; 517 timing->cfreq = gbe_pll->clock_rate * 1000 * timing->pll_m / 518 (timing->pll_n << timing->pll_p); 519 timing->htotal = var->left_margin + var->xres + 520 var->right_margin + var->hsync_len; 521 timing->vtotal = var->upper_margin + var->yres + 522 var->lower_margin + var->vsync_len; 523 timing->fields_sec = 1000 * timing->cfreq / timing->htotal * 524 1000 / timing->vtotal; 525 timing->hblank_start = var->xres; 526 timing->vblank_start = var->yres; 527 timing->hblank_end = timing->htotal; 528 timing->hsync_start = var->xres + var->right_margin + 1; 529 timing->hsync_end = timing->hsync_start + var->hsync_len; 530 timing->vblank_end = timing->vtotal; 531 timing->vsync_start = var->yres + var->lower_margin + 1; 532 timing->vsync_end = timing->vsync_start + var->vsync_len; 533 } 534 535 return pixclock; 536 } 537 538 static void gbe_set_timing_info(struct gbe_timing_info *timing) 539 { 540 int temp; 541 unsigned int val; 542 543 /* setup dot clock PLL */ 544 val = 0; 545 SET_GBE_FIELD(DOTCLK, M, val, timing->pll_m - 1); 546 SET_GBE_FIELD(DOTCLK, N, val, timing->pll_n - 1); 547 SET_GBE_FIELD(DOTCLK, P, val, timing->pll_p); 548 SET_GBE_FIELD(DOTCLK, RUN, val, 0); /* do not start yet */ 549 gbe->dotclock = val; 550 udelay(10000); 551 552 /* setup pixel counter */ 553 val = 0; 554 SET_GBE_FIELD(VT_XYMAX, MAXX, val, timing->htotal); 555 SET_GBE_FIELD(VT_XYMAX, MAXY, val, timing->vtotal); 556 gbe->vt_xymax = val; 557 558 /* setup video timing signals */ 559 val = 0; 560 SET_GBE_FIELD(VT_VSYNC, VSYNC_ON, val, timing->vsync_start); 561 SET_GBE_FIELD(VT_VSYNC, VSYNC_OFF, val, timing->vsync_end); 562 gbe->vt_vsync = val; 563 val = 0; 564 SET_GBE_FIELD(VT_HSYNC, HSYNC_ON, val, timing->hsync_start); 565 SET_GBE_FIELD(VT_HSYNC, HSYNC_OFF, val, timing->hsync_end); 566 gbe->vt_hsync = val; 567 val = 0; 568 SET_GBE_FIELD(VT_VBLANK, VBLANK_ON, val, timing->vblank_start); 569 SET_GBE_FIELD(VT_VBLANK, VBLANK_OFF, val, timing->vblank_end); 570 gbe->vt_vblank = val; 571 val = 0; 572 SET_GBE_FIELD(VT_HBLANK, HBLANK_ON, val, 573 timing->hblank_start - 5); 574 SET_GBE_FIELD(VT_HBLANK, HBLANK_OFF, val, 575 timing->hblank_end - 3); 576 gbe->vt_hblank = val; 577 578 /* setup internal timing signals */ 579 val = 0; 580 SET_GBE_FIELD(VT_VCMAP, VCMAP_ON, val, timing->vblank_start); 581 SET_GBE_FIELD(VT_VCMAP, VCMAP_OFF, val, timing->vblank_end); 582 gbe->vt_vcmap = val; 583 val = 0; 584 SET_GBE_FIELD(VT_HCMAP, HCMAP_ON, val, timing->hblank_start); 585 SET_GBE_FIELD(VT_HCMAP, HCMAP_OFF, val, timing->hblank_end); 586 gbe->vt_hcmap = val; 587 588 val = 0; 589 temp = timing->vblank_start - timing->vblank_end - 1; 590 if (temp > 0) 591 temp = -temp; 592 593 if (flat_panel_enabled) 594 gbefb_setup_flatpanel(timing); 595 596 SET_GBE_FIELD(DID_START_XY, DID_STARTY, val, (u32) temp); 597 if (timing->hblank_end >= 20) 598 SET_GBE_FIELD(DID_START_XY, DID_STARTX, val, 599 timing->hblank_end - 20); 600 else 601 SET_GBE_FIELD(DID_START_XY, DID_STARTX, val, 602 timing->htotal - (20 - timing->hblank_end)); 603 gbe->did_start_xy = val; 604 605 val = 0; 606 SET_GBE_FIELD(CRS_START_XY, CRS_STARTY, val, (u32) (temp + 1)); 607 if (timing->hblank_end >= GBE_CRS_MAGIC) 608 SET_GBE_FIELD(CRS_START_XY, CRS_STARTX, val, 609 timing->hblank_end - GBE_CRS_MAGIC); 610 else 611 SET_GBE_FIELD(CRS_START_XY, CRS_STARTX, val, 612 timing->htotal - (GBE_CRS_MAGIC - 613 timing->hblank_end)); 614 gbe->crs_start_xy = val; 615 616 val = 0; 617 SET_GBE_FIELD(VC_START_XY, VC_STARTY, val, (u32) temp); 618 SET_GBE_FIELD(VC_START_XY, VC_STARTX, val, timing->hblank_end - 4); 619 gbe->vc_start_xy = val; 620 621 val = 0; 622 temp = timing->hblank_end - GBE_PIXEN_MAGIC_ON; 623 if (temp < 0) 624 temp += timing->htotal; /* allow blank to wrap around */ 625 626 SET_GBE_FIELD(VT_HPIXEN, HPIXEN_ON, val, temp); 627 SET_GBE_FIELD(VT_HPIXEN, HPIXEN_OFF, val, 628 ((temp + timing->width - 629 GBE_PIXEN_MAGIC_OFF) % timing->htotal)); 630 gbe->vt_hpixen = val; 631 632 val = 0; 633 SET_GBE_FIELD(VT_VPIXEN, VPIXEN_ON, val, timing->vblank_end); 634 SET_GBE_FIELD(VT_VPIXEN, VPIXEN_OFF, val, timing->vblank_start); 635 gbe->vt_vpixen = val; 636 637 /* turn off sync on green */ 638 val = 0; 639 SET_GBE_FIELD(VT_FLAGS, SYNC_LOW, val, 1); 640 gbe->vt_flags = val; 641 } 642 643 /* 644 * Set the hardware according to 'par'. 645 */ 646 647 static int gbefb_set_par(struct fb_info *info) 648 { 649 int i; 650 unsigned int val; 651 int wholeTilesX, partTilesX, maxPixelsPerTileX; 652 int height_pix; 653 int xpmax, ypmax; /* Monitor resolution */ 654 int bytesPerPixel; /* Bytes per pixel */ 655 struct gbefb_par *par = (struct gbefb_par *) info->par; 656 657 compute_gbe_timing(&info->var, &par->timing); 658 659 bytesPerPixel = info->var.bits_per_pixel / 8; 660 info->fix.line_length = info->var.xres_virtual * bytesPerPixel; 661 xpmax = par->timing.width; 662 ypmax = par->timing.height; 663 664 /* turn off GBE */ 665 gbe_turn_off(); 666 667 /* set timing info */ 668 gbe_set_timing_info(&par->timing); 669 670 /* initialize DIDs */ 671 val = 0; 672 switch (bytesPerPixel) { 673 case 1: 674 SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_I8); 675 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 676 break; 677 case 2: 678 SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_ARGB5); 679 info->fix.visual = FB_VISUAL_TRUECOLOR; 680 break; 681 case 4: 682 SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_RGB8); 683 info->fix.visual = FB_VISUAL_TRUECOLOR; 684 break; 685 } 686 SET_GBE_FIELD(WID, BUF, val, GBE_BMODE_BOTH); 687 688 for (i = 0; i < 32; i++) 689 gbe->mode_regs[i] = val; 690 691 /* Initialize interrupts */ 692 gbe->vt_intr01 = 0xffffffff; 693 gbe->vt_intr23 = 0xffffffff; 694 695 /* HACK: 696 The GBE hardware uses a tiled memory to screen mapping. Tiles are 697 blocks of 512x128, 256x128 or 128x128 pixels, respectively for 8bit, 698 16bit and 32 bit modes (64 kB). They cover the screen with partial 699 tiles on the right and/or bottom of the screen if needed. 700 For example in 640x480 8 bit mode the mapping is: 701 702 <-------- 640 -----> 703 <---- 512 ----><128|384 offscreen> 704 ^ ^ 705 | 128 [tile 0] [tile 1] 706 | v 707 ^ 708 4 128 [tile 2] [tile 3] 709 8 v 710 0 ^ 711 128 [tile 4] [tile 5] 712 | v 713 | ^ 714 v 96 [tile 6] [tile 7] 715 32 offscreen 716 717 Tiles have the advantage that they can be allocated individually in 718 memory. However, this mapping is not linear at all, which is not 719 really convenient. In order to support linear addressing, the GBE 720 DMA hardware is fooled into thinking the screen is only one tile 721 large and but has a greater height, so that the DMA transfer covers 722 the same region. 723 Tiles are still allocated as independent chunks of 64KB of 724 continuous physical memory and remapped so that the kernel sees the 725 framebuffer as a continuous virtual memory. The GBE tile table is 726 set up so that each tile references one of these 64k blocks: 727 728 GBE -> tile list framebuffer TLB <------------ CPU 729 [ tile 0 ] -> [ 64KB ] <- [ 16x 4KB page entries ] ^ 730 ... ... ... linear virtual FB 731 [ tile n ] -> [ 64KB ] <- [ 16x 4KB page entries ] v 732 733 734 The GBE hardware is then told that the buffer is 512*tweaked_height, 735 with tweaked_height = real_width*real_height/pixels_per_tile. 736 Thus the GBE hardware will scan the first tile, filing the first 64k 737 covered region of the screen, and then will proceed to the next 738 tile, until the whole screen is covered. 739 740 Here is what would happen at 640x480 8bit: 741 742 normal tiling linear 743 ^ 11111111111111112222 11111111111111111111 ^ 744 128 11111111111111112222 11111111111111111111 102 lines 745 11111111111111112222 11111111111111111111 v 746 V 11111111111111112222 11111111222222222222 747 33333333333333334444 22222222222222222222 748 33333333333333334444 22222222222222222222 749 < 512 > < 256 > 102*640+256 = 64k 750 751 NOTE: The only mode for which this is not working is 800x600 8bit, 752 as 800*600/512 = 937.5 which is not integer and thus causes 753 flickering. 754 I guess this is not so important as one can use 640x480 8bit or 755 800x600 16bit anyway. 756 */ 757 758 /* Tell gbe about the tiles table location */ 759 /* tile_ptr -> [ tile 1 ] -> FB mem */ 760 /* [ tile 2 ] -> FB mem */ 761 /* ... */ 762 val = 0; 763 SET_GBE_FIELD(FRM_CONTROL, FRM_TILE_PTR, val, gbe_tiles.dma >> 9); 764 SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 0); /* do not start */ 765 SET_GBE_FIELD(FRM_CONTROL, FRM_LINEAR, val, 0); 766 gbe->frm_control = val; 767 768 maxPixelsPerTileX = 512 / bytesPerPixel; 769 wholeTilesX = 1; 770 partTilesX = 0; 771 772 /* Initialize the framebuffer */ 773 val = 0; 774 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_WIDTH_TILE, val, wholeTilesX); 775 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_RHS, val, partTilesX); 776 777 switch (bytesPerPixel) { 778 case 1: 779 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val, 780 GBE_FRM_DEPTH_8); 781 break; 782 case 2: 783 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val, 784 GBE_FRM_DEPTH_16); 785 break; 786 case 4: 787 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val, 788 GBE_FRM_DEPTH_32); 789 break; 790 } 791 gbe->frm_size_tile = val; 792 793 /* compute tweaked height */ 794 height_pix = xpmax * ypmax / maxPixelsPerTileX; 795 796 val = 0; 797 SET_GBE_FIELD(FRM_SIZE_PIXEL, FB_HEIGHT_PIX, val, height_pix); 798 gbe->frm_size_pixel = val; 799 800 /* turn off DID and overlay DMA */ 801 gbe->did_control = 0; 802 gbe->ovr_width_tile = 0; 803 804 /* Turn off mouse cursor */ 805 gbe->crs_ctl = 0; 806 807 /* Turn on GBE */ 808 gbe_turn_on(); 809 810 /* Initialize the gamma map */ 811 udelay(10); 812 for (i = 0; i < 256; i++) 813 gbe->gmap[i] = (i << 24) | (i << 16) | (i << 8); 814 815 /* Initialize the color map */ 816 for (i = 0; i < 256; i++) 817 gbe_cmap[i] = (i << 8) | (i << 16) | (i << 24); 818 819 gbe_loadcmap(); 820 821 return 0; 822 } 823 824 static void gbefb_encode_fix(struct fb_fix_screeninfo *fix, 825 struct fb_var_screeninfo *var) 826 { 827 memset(fix, 0, sizeof(struct fb_fix_screeninfo)); 828 strcpy(fix->id, "SGI GBE"); 829 fix->smem_start = (unsigned long) gbe_mem; 830 fix->smem_len = gbe_mem_size; 831 fix->type = FB_TYPE_PACKED_PIXELS; 832 fix->type_aux = 0; 833 fix->accel = FB_ACCEL_NONE; 834 switch (var->bits_per_pixel) { 835 case 8: 836 fix->visual = FB_VISUAL_PSEUDOCOLOR; 837 break; 838 default: 839 fix->visual = FB_VISUAL_TRUECOLOR; 840 break; 841 } 842 fix->ywrapstep = 0; 843 fix->xpanstep = 0; 844 fix->ypanstep = 0; 845 fix->line_length = var->xres_virtual * var->bits_per_pixel / 8; 846 fix->mmio_start = GBE_BASE; 847 fix->mmio_len = sizeof(struct sgi_gbe); 848 } 849 850 /* 851 * Set a single color register. The values supplied are already 852 * rounded down to the hardware's capabilities (according to the 853 * entries in the var structure). Return != 0 for invalid regno. 854 */ 855 856 static int gbefb_setcolreg(unsigned regno, unsigned red, unsigned green, 857 unsigned blue, unsigned transp, 858 struct fb_info *info) 859 { 860 int i; 861 862 if (regno > 255) 863 return 1; 864 red >>= 8; 865 green >>= 8; 866 blue >>= 8; 867 868 if (info->var.bits_per_pixel <= 8) { 869 gbe_cmap[regno] = (red << 24) | (green << 16) | (blue << 8); 870 if (gbe_turned_on) { 871 /* wait for the color map FIFO to have a free entry */ 872 for (i = 0; i < 1000 && gbe->cm_fifo >= 63; i++) 873 udelay(10); 874 if (i == 1000) { 875 printk(KERN_ERR "gbefb: cmap FIFO timeout\n"); 876 return 1; 877 } 878 gbe->cmap[regno] = gbe_cmap[regno]; 879 } 880 } else if (regno < 16) { 881 switch (info->var.bits_per_pixel) { 882 case 15: 883 case 16: 884 red >>= 3; 885 green >>= 3; 886 blue >>= 3; 887 pseudo_palette[regno] = 888 (red << info->var.red.offset) | 889 (green << info->var.green.offset) | 890 (blue << info->var.blue.offset); 891 break; 892 case 32: 893 pseudo_palette[regno] = 894 (red << info->var.red.offset) | 895 (green << info->var.green.offset) | 896 (blue << info->var.blue.offset); 897 break; 898 } 899 } 900 901 return 0; 902 } 903 904 /* 905 * Check video mode validity, eventually modify var to best match. 906 */ 907 static int gbefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 908 { 909 unsigned int line_length; 910 struct gbe_timing_info timing; 911 int ret; 912 913 /* Limit bpp to 8, 16, and 32 */ 914 if (var->bits_per_pixel <= 8) 915 var->bits_per_pixel = 8; 916 else if (var->bits_per_pixel <= 16) 917 var->bits_per_pixel = 16; 918 else if (var->bits_per_pixel <= 32) 919 var->bits_per_pixel = 32; 920 else 921 return -EINVAL; 922 923 /* Check the mode can be mapped linearly with the tile table trick. */ 924 /* This requires width x height x bytes/pixel be a multiple of 512 */ 925 if ((var->xres * var->yres * var->bits_per_pixel) & 4095) 926 return -EINVAL; 927 928 var->grayscale = 0; /* No grayscale for now */ 929 930 ret = compute_gbe_timing(var, &timing); 931 var->pixclock = ret; 932 if (ret < 0) 933 return -EINVAL; 934 935 /* Adjust virtual resolution, if necessary */ 936 if (var->xres > var->xres_virtual || (!ywrap && !ypan)) 937 var->xres_virtual = var->xres; 938 if (var->yres > var->yres_virtual || (!ywrap && !ypan)) 939 var->yres_virtual = var->yres; 940 941 if (var->vmode & FB_VMODE_CONUPDATE) { 942 var->vmode |= FB_VMODE_YWRAP; 943 var->xoffset = info->var.xoffset; 944 var->yoffset = info->var.yoffset; 945 } 946 947 /* No grayscale for now */ 948 var->grayscale = 0; 949 950 /* Memory limit */ 951 line_length = var->xres_virtual * var->bits_per_pixel / 8; 952 if (line_length * var->yres_virtual > gbe_mem_size) 953 return -ENOMEM; /* Virtual resolution too high */ 954 955 switch (var->bits_per_pixel) { 956 case 8: 957 var->red.offset = 0; 958 var->red.length = 8; 959 var->green.offset = 0; 960 var->green.length = 8; 961 var->blue.offset = 0; 962 var->blue.length = 8; 963 var->transp.offset = 0; 964 var->transp.length = 0; 965 break; 966 case 16: /* RGB 1555 */ 967 var->red.offset = 10; 968 var->red.length = 5; 969 var->green.offset = 5; 970 var->green.length = 5; 971 var->blue.offset = 0; 972 var->blue.length = 5; 973 var->transp.offset = 0; 974 var->transp.length = 0; 975 break; 976 case 32: /* RGB 8888 */ 977 var->red.offset = 24; 978 var->red.length = 8; 979 var->green.offset = 16; 980 var->green.length = 8; 981 var->blue.offset = 8; 982 var->blue.length = 8; 983 var->transp.offset = 0; 984 var->transp.length = 8; 985 break; 986 } 987 var->red.msb_right = 0; 988 var->green.msb_right = 0; 989 var->blue.msb_right = 0; 990 var->transp.msb_right = 0; 991 992 var->left_margin = timing.htotal - timing.hsync_end; 993 var->right_margin = timing.hsync_start - timing.width; 994 var->upper_margin = timing.vtotal - timing.vsync_end; 995 var->lower_margin = timing.vsync_start - timing.height; 996 var->hsync_len = timing.hsync_end - timing.hsync_start; 997 var->vsync_len = timing.vsync_end - timing.vsync_start; 998 999 return 0; 1000 } 1001 1002 static int gbefb_mmap(struct fb_info *info, 1003 struct vm_area_struct *vma) 1004 { 1005 unsigned long size = vma->vm_end - vma->vm_start; 1006 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 1007 unsigned long addr; 1008 unsigned long phys_addr, phys_size; 1009 u16 *tile; 1010 1011 /* check range */ 1012 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) 1013 return -EINVAL; 1014 if (size > gbe_mem_size) 1015 return -EINVAL; 1016 if (offset > gbe_mem_size - size) 1017 return -EINVAL; 1018 1019 /* remap using the fastest write-through mode on architecture */ 1020 /* try not polluting the cache when possible */ 1021 pgprot_val(vma->vm_page_prot) = 1022 pgprot_fb(pgprot_val(vma->vm_page_prot)); 1023 1024 /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */ 1025 1026 /* look for the starting tile */ 1027 tile = &gbe_tiles.cpu[offset >> TILE_SHIFT]; 1028 addr = vma->vm_start; 1029 offset &= TILE_MASK; 1030 1031 /* remap each tile separately */ 1032 do { 1033 phys_addr = (((unsigned long) (*tile)) << TILE_SHIFT) + offset; 1034 if ((offset + size) < TILE_SIZE) 1035 phys_size = size; 1036 else 1037 phys_size = TILE_SIZE - offset; 1038 1039 if (remap_pfn_range(vma, addr, phys_addr >> PAGE_SHIFT, 1040 phys_size, vma->vm_page_prot)) 1041 return -EAGAIN; 1042 1043 offset = 0; 1044 size -= phys_size; 1045 addr += phys_size; 1046 tile++; 1047 } while (size); 1048 1049 return 0; 1050 } 1051 1052 static struct fb_ops gbefb_ops = { 1053 .owner = THIS_MODULE, 1054 .fb_check_var = gbefb_check_var, 1055 .fb_set_par = gbefb_set_par, 1056 .fb_setcolreg = gbefb_setcolreg, 1057 .fb_mmap = gbefb_mmap, 1058 .fb_blank = gbefb_blank, 1059 .fb_fillrect = cfb_fillrect, 1060 .fb_copyarea = cfb_copyarea, 1061 .fb_imageblit = cfb_imageblit, 1062 }; 1063 1064 /* 1065 * sysfs 1066 */ 1067 1068 static ssize_t gbefb_show_memsize(struct device *dev, struct device_attribute *attr, char *buf) 1069 { 1070 return snprintf(buf, PAGE_SIZE, "%u\n", gbe_mem_size); 1071 } 1072 1073 static DEVICE_ATTR(size, S_IRUGO, gbefb_show_memsize, NULL); 1074 1075 static ssize_t gbefb_show_rev(struct device *device, struct device_attribute *attr, char *buf) 1076 { 1077 return snprintf(buf, PAGE_SIZE, "%d\n", gbe_revision); 1078 } 1079 1080 static DEVICE_ATTR(revision, S_IRUGO, gbefb_show_rev, NULL); 1081 1082 static void gbefb_remove_sysfs(struct device *dev) 1083 { 1084 device_remove_file(dev, &dev_attr_size); 1085 device_remove_file(dev, &dev_attr_revision); 1086 } 1087 1088 static void gbefb_create_sysfs(struct device *dev) 1089 { 1090 device_create_file(dev, &dev_attr_size); 1091 device_create_file(dev, &dev_attr_revision); 1092 } 1093 1094 /* 1095 * Initialization 1096 */ 1097 1098 static int gbefb_setup(char *options) 1099 { 1100 char *this_opt; 1101 1102 if (!options || !*options) 1103 return 0; 1104 1105 while ((this_opt = strsep(&options, ",")) != NULL) { 1106 if (!strncmp(this_opt, "monitor:", 8)) { 1107 if (!strncmp(this_opt + 8, "crt", 3)) { 1108 flat_panel_enabled = 0; 1109 default_var = &default_var_CRT; 1110 default_mode = &default_mode_CRT; 1111 } else if (!strncmp(this_opt + 8, "1600sw", 6) || 1112 !strncmp(this_opt + 8, "lcd", 3)) { 1113 flat_panel_enabled = 1; 1114 default_var = &default_var_LCD; 1115 default_mode = &default_mode_LCD; 1116 } 1117 } else if (!strncmp(this_opt, "mem:", 4)) { 1118 gbe_mem_size = memparse(this_opt + 4, &this_opt); 1119 if (gbe_mem_size > CONFIG_FB_GBE_MEM * 1024 * 1024) 1120 gbe_mem_size = CONFIG_FB_GBE_MEM * 1024 * 1024; 1121 if (gbe_mem_size < TILE_SIZE) 1122 gbe_mem_size = TILE_SIZE; 1123 } else 1124 mode_option = this_opt; 1125 } 1126 return 0; 1127 } 1128 1129 static int gbefb_probe(struct platform_device *p_dev) 1130 { 1131 int i, ret = 0; 1132 struct fb_info *info; 1133 struct gbefb_par *par; 1134 #ifndef MODULE 1135 char *options = NULL; 1136 #endif 1137 1138 info = framebuffer_alloc(sizeof(struct gbefb_par), &p_dev->dev); 1139 if (!info) 1140 return -ENOMEM; 1141 1142 #ifndef MODULE 1143 if (fb_get_options("gbefb", &options)) { 1144 ret = -ENODEV; 1145 goto out_release_framebuffer; 1146 } 1147 gbefb_setup(options); 1148 #endif 1149 1150 if (!request_mem_region(GBE_BASE, sizeof(struct sgi_gbe), "GBE")) { 1151 printk(KERN_ERR "gbefb: couldn't reserve mmio region\n"); 1152 ret = -EBUSY; 1153 goto out_release_framebuffer; 1154 } 1155 1156 gbe = (struct sgi_gbe *) devm_ioremap(&p_dev->dev, GBE_BASE, 1157 sizeof(struct sgi_gbe)); 1158 if (!gbe) { 1159 printk(KERN_ERR "gbefb: couldn't map mmio region\n"); 1160 ret = -ENXIO; 1161 goto out_release_mem_region; 1162 } 1163 gbe_revision = gbe->ctrlstat & 15; 1164 1165 gbe_tiles.cpu = dmam_alloc_coherent(&p_dev->dev, 1166 GBE_TLB_SIZE * sizeof(uint16_t), 1167 &gbe_tiles.dma, GFP_KERNEL); 1168 if (!gbe_tiles.cpu) { 1169 printk(KERN_ERR "gbefb: couldn't allocate tiles table\n"); 1170 ret = -ENOMEM; 1171 goto out_release_mem_region; 1172 } 1173 1174 if (gbe_mem_phys) { 1175 /* memory was allocated at boot time */ 1176 gbe_mem = devm_ioremap_wc(&p_dev->dev, gbe_mem_phys, 1177 gbe_mem_size); 1178 if (!gbe_mem) { 1179 printk(KERN_ERR "gbefb: couldn't map framebuffer\n"); 1180 ret = -ENOMEM; 1181 goto out_release_mem_region; 1182 } 1183 1184 gbe_dma_addr = 0; 1185 } else { 1186 /* try to allocate memory with the classical allocator 1187 * this has high chance to fail on low memory machines */ 1188 gbe_mem = dmam_alloc_attrs(&p_dev->dev, gbe_mem_size, 1189 &gbe_dma_addr, GFP_KERNEL, 1190 DMA_ATTR_WRITE_COMBINE); 1191 if (!gbe_mem) { 1192 printk(KERN_ERR "gbefb: couldn't allocate framebuffer memory\n"); 1193 ret = -ENOMEM; 1194 goto out_release_mem_region; 1195 } 1196 1197 gbe_mem_phys = (unsigned long) gbe_dma_addr; 1198 } 1199 1200 par = info->par; 1201 par->wc_cookie = arch_phys_wc_add(gbe_mem_phys, gbe_mem_size); 1202 1203 /* map framebuffer memory into tiles table */ 1204 for (i = 0; i < (gbe_mem_size >> TILE_SHIFT); i++) 1205 gbe_tiles.cpu[i] = (gbe_mem_phys >> TILE_SHIFT) + i; 1206 1207 info->fbops = &gbefb_ops; 1208 info->pseudo_palette = pseudo_palette; 1209 info->flags = FBINFO_DEFAULT; 1210 info->screen_base = gbe_mem; 1211 fb_alloc_cmap(&info->cmap, 256, 0); 1212 1213 /* reset GBE */ 1214 gbe_reset(); 1215 1216 /* turn on default video mode */ 1217 if (fb_find_mode(&par->var, info, mode_option, NULL, 0, 1218 default_mode, 8) == 0) 1219 par->var = *default_var; 1220 info->var = par->var; 1221 gbefb_check_var(&par->var, info); 1222 gbefb_encode_fix(&info->fix, &info->var); 1223 1224 if (register_framebuffer(info) < 0) { 1225 printk(KERN_ERR "gbefb: couldn't register framebuffer\n"); 1226 ret = -ENXIO; 1227 goto out_gbe_unmap; 1228 } 1229 1230 platform_set_drvdata(p_dev, info); 1231 gbefb_create_sysfs(&p_dev->dev); 1232 1233 fb_info(info, "%s rev %d @ 0x%08x using %dkB memory\n", 1234 info->fix.id, gbe_revision, (unsigned)GBE_BASE, 1235 gbe_mem_size >> 10); 1236 1237 return 0; 1238 1239 out_gbe_unmap: 1240 arch_phys_wc_del(par->wc_cookie); 1241 out_release_mem_region: 1242 release_mem_region(GBE_BASE, sizeof(struct sgi_gbe)); 1243 out_release_framebuffer: 1244 framebuffer_release(info); 1245 1246 return ret; 1247 } 1248 1249 static int gbefb_remove(struct platform_device* p_dev) 1250 { 1251 struct fb_info *info = platform_get_drvdata(p_dev); 1252 struct gbefb_par *par = info->par; 1253 1254 unregister_framebuffer(info); 1255 gbe_turn_off(); 1256 arch_phys_wc_del(par->wc_cookie); 1257 release_mem_region(GBE_BASE, sizeof(struct sgi_gbe)); 1258 gbefb_remove_sysfs(&p_dev->dev); 1259 framebuffer_release(info); 1260 1261 return 0; 1262 } 1263 1264 static struct platform_driver gbefb_driver = { 1265 .probe = gbefb_probe, 1266 .remove = gbefb_remove, 1267 .driver = { 1268 .name = "gbefb", 1269 }, 1270 }; 1271 1272 static struct platform_device *gbefb_device; 1273 1274 static int __init gbefb_init(void) 1275 { 1276 int ret = platform_driver_register(&gbefb_driver); 1277 if (!ret) { 1278 gbefb_device = platform_device_alloc("gbefb", 0); 1279 if (gbefb_device) { 1280 ret = platform_device_add(gbefb_device); 1281 } else { 1282 ret = -ENOMEM; 1283 } 1284 if (ret) { 1285 platform_device_put(gbefb_device); 1286 platform_driver_unregister(&gbefb_driver); 1287 } 1288 } 1289 return ret; 1290 } 1291 1292 static void __exit gbefb_exit(void) 1293 { 1294 platform_device_unregister(gbefb_device); 1295 platform_driver_unregister(&gbefb_driver); 1296 } 1297 1298 module_init(gbefb_init); 1299 module_exit(gbefb_exit); 1300 1301 MODULE_LICENSE("GPL"); 1302