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acornfb.c
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linux-6.19.14/drivers/video/fbdev/acornfb.c
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/drivers/video/acornfb.c 4 * 5 * Copyright (C) 1998-2001 Russell King 6 * 7 * Frame buffer code for Acorn platforms 8 * 9 * NOTE: Most of the modes with X!=640 will disappear shortly. 10 * NOTE: Startup setting of HS & VS polarity not supported. 11 * (do we need to support it if we're coming up in 640x480?) 12 * 13 * FIXME: (things broken by the "new improved" FBCON API) 14 * - Blanking 8bpp displays with VIDC 15 */ 16 17#include <linux/module.h> 18#include <linux/kernel.h> 19#include <linux/errno.h> 20#include <linux/string.h> 21#include <linux/ctype.h> 22#include <linux/mm.h> 23#include <linux/init.h> 24#include <linux/fb.h> 25#include <linux/platform_device.h> 26#include <linux/dma-mapping.h> 27#include <linux/io.h> 28#include <linux/gfp.h> 29 30#include <mach/hardware.h> 31#include <asm/irq.h> 32#include <asm/mach-types.h> 33 34#include "acornfb.h" 35 36/* 37 * Default resolution. 38 * NOTE that it has to be supported in the table towards 39 * the end of this file. 40 */ 41#define DEFAULT_XRES 640 42#define DEFAULT_YRES 480 43#define DEFAULT_BPP 4 44 45/* 46 * define this to debug the video mode selection 47 */ 48#undef DEBUG_MODE_SELECTION 49 50/* 51 * Translation from RISC OS monitor types to actual 52 * HSYNC and VSYNC frequency ranges. These are 53 * probably not right, but they're the best info I 54 * have. Allow 1% either way on the nominal for TVs. 55 */ 56#define NR_MONTYPES 6 57static struct fb_monspecs monspecs[NR_MONTYPES] = { 58 { /* TV */ 59 .hfmin = 15469, 60 .hfmax = 15781, 61 .vfmin = 49, 62 .vfmax = 51, 63 }, { /* Multi Freq */ 64 .hfmin = 0, 65 .hfmax = 99999, 66 .vfmin = 0, 67 .vfmax = 199, 68 }, { /* Hi-res mono */ 69 .hfmin = 58608, 70 .hfmax = 58608, 71 .vfmin = 64, 72 .vfmax = 64, 73 }, { /* VGA */ 74 .hfmin = 30000, 75 .hfmax = 70000, 76 .vfmin = 60, 77 .vfmax = 60, 78 }, { /* SVGA */ 79 .hfmin = 30000, 80 .hfmax = 70000, 81 .vfmin = 56, 82 .vfmax = 75, 83 }, { 84 .hfmin = 30000, 85 .hfmax = 70000, 86 .vfmin = 60, 87 .vfmax = 60, 88 } 89}; 90 91static struct fb_info fb_info; 92static struct acornfb_par current_par; 93static struct vidc_timing current_vidc; 94 95extern unsigned int vram_size; /* set by setup.c */ 96 97#ifdef HAS_VIDC20 98#include <mach/acornfb.h> 99 100#define MAX_SIZE (2*1024*1024) 101 102/* VIDC20 has a different set of rules from the VIDC: 103 * hcr : must be multiple of 4 104 * hswr : must be even 105 * hdsr : must be even 106 * hder : must be even 107 * vcr : >= 2, (interlace, must be odd) 108 * vswr : >= 1 109 * vdsr : >= 1 110 * vder : >= vdsr 111 */ 112static void acornfb_set_timing(struct fb_info *info) 113{ 114 struct fb_var_screeninfo *var = &info->var; 115 struct vidc_timing vidc; 116 u_int vcr, fsize; 117 u_int ext_ctl, dat_ctl; 118 u_int words_per_line; 119 120 memset(&vidc, 0, sizeof(vidc)); 121 122 vidc.h_sync_width = var->hsync_len - 8; 123 vidc.h_border_start = vidc.h_sync_width + var->left_margin + 8 - 12; 124 vidc.h_display_start = vidc.h_border_start + 12 - 18; 125 vidc.h_display_end = vidc.h_display_start + var->xres; 126 vidc.h_border_end = vidc.h_display_end + 18 - 12; 127 vidc.h_cycle = vidc.h_border_end + var->right_margin + 12 - 8; 128 vidc.h_interlace = vidc.h_cycle / 2; 129 vidc.v_sync_width = var->vsync_len - 1; 130 vidc.v_border_start = vidc.v_sync_width + var->upper_margin; 131 vidc.v_display_start = vidc.v_border_start; 132 vidc.v_display_end = vidc.v_display_start + var->yres; 133 vidc.v_border_end = vidc.v_display_end; 134 vidc.control = acornfb_default_control(); 135 136 vcr = var->vsync_len + var->upper_margin + var->yres + 137 var->lower_margin; 138 139 if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) { 140 vidc.v_cycle = (vcr - 3) / 2; 141 vidc.control |= VIDC20_CTRL_INT; 142 } else 143 vidc.v_cycle = vcr - 2; 144 145 switch (var->bits_per_pixel) { 146 case 1: vidc.control |= VIDC20_CTRL_1BPP; break; 147 case 2: vidc.control |= VIDC20_CTRL_2BPP; break; 148 case 4: vidc.control |= VIDC20_CTRL_4BPP; break; 149 default: 150 case 8: vidc.control |= VIDC20_CTRL_8BPP; break; 151 case 16: vidc.control |= VIDC20_CTRL_16BPP; break; 152 case 32: vidc.control |= VIDC20_CTRL_32BPP; break; 153 } 154 155 acornfb_vidc20_find_rates(&vidc, var); 156 fsize = var->vsync_len + var->upper_margin + var->lower_margin - 1; 157 158 if (memcmp(¤t_vidc, &vidc, sizeof(vidc))) { 159 current_vidc = vidc; 160 161 vidc_writel(VIDC20_CTRL | vidc.control); 162 vidc_writel(0xd0000000 | vidc.pll_ctl); 163 vidc_writel(0x80000000 | vidc.h_cycle); 164 vidc_writel(0x81000000 | vidc.h_sync_width); 165 vidc_writel(0x82000000 | vidc.h_border_start); 166 vidc_writel(0x83000000 | vidc.h_display_start); 167 vidc_writel(0x84000000 | vidc.h_display_end); 168 vidc_writel(0x85000000 | vidc.h_border_end); 169 vidc_writel(0x86000000); 170 vidc_writel(0x87000000 | vidc.h_interlace); 171 vidc_writel(0x90000000 | vidc.v_cycle); 172 vidc_writel(0x91000000 | vidc.v_sync_width); 173 vidc_writel(0x92000000 | vidc.v_border_start); 174 vidc_writel(0x93000000 | vidc.v_display_start); 175 vidc_writel(0x94000000 | vidc.v_display_end); 176 vidc_writel(0x95000000 | vidc.v_border_end); 177 vidc_writel(0x96000000); 178 vidc_writel(0x97000000); 179 } 180 181 iomd_writel(fsize, IOMD_FSIZE); 182 183 ext_ctl = acornfb_default_econtrol(); 184 185 if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */ 186 ext_ctl |= VIDC20_ECTL_HS_NCSYNC | VIDC20_ECTL_VS_NCSYNC; 187 else { 188 if (var->sync & FB_SYNC_HOR_HIGH_ACT) 189 ext_ctl |= VIDC20_ECTL_HS_HSYNC; 190 else 191 ext_ctl |= VIDC20_ECTL_HS_NHSYNC; 192 193 if (var->sync & FB_SYNC_VERT_HIGH_ACT) 194 ext_ctl |= VIDC20_ECTL_VS_VSYNC; 195 else 196 ext_ctl |= VIDC20_ECTL_VS_NVSYNC; 197 } 198 199 vidc_writel(VIDC20_ECTL | ext_ctl); 200 201 words_per_line = var->xres * var->bits_per_pixel / 32; 202 203 if (current_par.using_vram && info->fix.smem_len == 2048*1024) 204 words_per_line /= 2; 205 206 /* RiscPC doesn't use the VIDC's VRAM control. */ 207 dat_ctl = VIDC20_DCTL_VRAM_DIS | VIDC20_DCTL_SNA | words_per_line; 208 209 /* The data bus width is dependent on both the type 210 * and amount of video memory. 211 * DRAM 32bit low 212 * 1MB VRAM 32bit 213 * 2MB VRAM 64bit 214 */ 215 if (current_par.using_vram && current_par.vram_half_sam == 2048) 216 dat_ctl |= VIDC20_DCTL_BUS_D63_0; 217 else 218 dat_ctl |= VIDC20_DCTL_BUS_D31_0; 219 220 vidc_writel(VIDC20_DCTL | dat_ctl); 221 222#ifdef DEBUG_MODE_SELECTION 223 printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres, 224 var->yres, var->bits_per_pixel); 225 printk(KERN_DEBUG " H-cycle : %d\n", vidc.h_cycle); 226 printk(KERN_DEBUG " H-sync-width : %d\n", vidc.h_sync_width); 227 printk(KERN_DEBUG " H-border-start : %d\n", vidc.h_border_start); 228 printk(KERN_DEBUG " H-display-start : %d\n", vidc.h_display_start); 229 printk(KERN_DEBUG " H-display-end : %d\n", vidc.h_display_end); 230 printk(KERN_DEBUG " H-border-end : %d\n", vidc.h_border_end); 231 printk(KERN_DEBUG " H-interlace : %d\n", vidc.h_interlace); 232 printk(KERN_DEBUG " V-cycle : %d\n", vidc.v_cycle); 233 printk(KERN_DEBUG " V-sync-width : %d\n", vidc.v_sync_width); 234 printk(KERN_DEBUG " V-border-start : %d\n", vidc.v_border_start); 235 printk(KERN_DEBUG " V-display-start : %d\n", vidc.v_display_start); 236 printk(KERN_DEBUG " V-display-end : %d\n", vidc.v_display_end); 237 printk(KERN_DEBUG " V-border-end : %d\n", vidc.v_border_end); 238 printk(KERN_DEBUG " Ext Ctrl (C) : 0x%08X\n", ext_ctl); 239 printk(KERN_DEBUG " PLL Ctrl (D) : 0x%08X\n", vidc.pll_ctl); 240 printk(KERN_DEBUG " Ctrl (E) : 0x%08X\n", vidc.control); 241 printk(KERN_DEBUG " Data Ctrl (F) : 0x%08X\n", dat_ctl); 242 printk(KERN_DEBUG " Fsize : 0x%08X\n", fsize); 243#endif 244} 245 246/* 247 * We have to take note of the VIDC20's 16-bit palette here. 248 * The VIDC20 looks up a 16 bit pixel as follows: 249 * 250 * bits 111111 251 * 5432109876543210 252 * red ++++++++ (8 bits, 7 to 0) 253 * green ++++++++ (8 bits, 11 to 4) 254 * blue ++++++++ (8 bits, 15 to 8) 255 * 256 * We use a pixel which looks like: 257 * 258 * bits 111111 259 * 5432109876543210 260 * red +++++ (5 bits, 4 to 0) 261 * green +++++ (5 bits, 9 to 5) 262 * blue +++++ (5 bits, 14 to 10) 263 */ 264static int 265acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 266 u_int trans, struct fb_info *info) 267{ 268 union palette pal; 269 270 if (regno >= current_par.palette_size) 271 return 1; 272 273 if (regno < 16 && info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 274 u32 pseudo_val; 275 276 pseudo_val = regno << info->var.red.offset; 277 pseudo_val |= regno << info->var.green.offset; 278 pseudo_val |= regno << info->var.blue.offset; 279 280 ((u32 *)info->pseudo_palette)[regno] = pseudo_val; 281 } 282 283 pal.p = 0; 284 pal.vidc20.red = red >> 8; 285 pal.vidc20.green = green >> 8; 286 pal.vidc20.blue = blue >> 8; 287 288 current_par.palette[regno] = pal; 289 290 if (info->var.bits_per_pixel == 16) { 291 int i; 292 293 pal.p = 0; 294 vidc_writel(0x10000000); 295 for (i = 0; i < 256; i += 1) { 296 pal.vidc20.red = current_par.palette[i & 31].vidc20.red; 297 pal.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green; 298 pal.vidc20.blue = current_par.palette[(i >> 2) & 31].vidc20.blue; 299 vidc_writel(pal.p); 300 /* Palette register pointer auto-increments */ 301 } 302 } else { 303 vidc_writel(0x10000000 | regno); 304 vidc_writel(pal.p); 305 } 306 307 return 0; 308} 309#endif 310 311/* 312 * Before selecting the timing parameters, adjust 313 * the resolution to fit the rules. 314 */ 315static int 316acornfb_adjust_timing(struct fb_info *info, struct fb_var_screeninfo *var, u_int fontht) 317{ 318 u_int font_line_len, sam_size, min_size, size, nr_y; 319 320 /* xres must be even */ 321 var->xres = (var->xres + 1) & ~1; 322 323 /* 324 * We don't allow xres_virtual to differ from xres 325 */ 326 var->xres_virtual = var->xres; 327 var->xoffset = 0; 328 329 if (current_par.using_vram) 330 sam_size = current_par.vram_half_sam * 2; 331 else 332 sam_size = 16; 333 334 /* 335 * Now, find a value for yres_virtual which allows 336 * us to do ywrap scrolling. The value of 337 * yres_virtual must be such that the end of the 338 * displayable frame buffer must be aligned with 339 * the start of a font line. 340 */ 341 font_line_len = var->xres * var->bits_per_pixel * fontht / 8; 342 min_size = var->xres * var->yres * var->bits_per_pixel / 8; 343 344 /* 345 * If minimum screen size is greater than that we have 346 * available, reject it. 347 */ 348 if (min_size > info->fix.smem_len) 349 return -EINVAL; 350 351 /* Find int 'y', such that y * fll == s * sam < maxsize 352 * y = s * sam / fll; s = maxsize / sam 353 */ 354 for (size = info->fix.smem_len; 355 nr_y = size / font_line_len, min_size <= size; 356 size -= sam_size) { 357 if (nr_y * font_line_len == size) 358 break; 359 } 360 nr_y *= fontht; 361 362 if (var->accel_flags & FB_ACCELF_TEXT) { 363 if (min_size > size) { 364 /* 365 * failed, use ypan 366 */ 367 size = info->fix.smem_len; 368 var->yres_virtual = size / (font_line_len / fontht); 369 } else 370 var->yres_virtual = nr_y; 371 } else if (var->yres_virtual > nr_y) 372 var->yres_virtual = nr_y; 373 374 current_par.screen_end = info->fix.smem_start + size; 375 376 /* 377 * Fix yres & yoffset if needed. 378 */ 379 if (var->yres > var->yres_virtual) 380 var->yres = var->yres_virtual; 381 382 if (var->vmode & FB_VMODE_YWRAP) { 383 if (var->yoffset > var->yres_virtual) 384 var->yoffset = var->yres_virtual; 385 } else { 386 if (var->yoffset + var->yres > var->yres_virtual) 387 var->yoffset = var->yres_virtual - var->yres; 388 } 389 390 /* hsync_len must be even */ 391 var->hsync_len = (var->hsync_len + 1) & ~1; 392 393#if defined(HAS_VIDC20) 394 /* left_margin must be even */ 395 if (var->left_margin & 1) { 396 var->left_margin += 1; 397 var->right_margin -= 1; 398 } 399 400 /* right_margin must be even */ 401 if (var->right_margin & 1) 402 var->right_margin += 1; 403#endif 404 405 if (var->vsync_len < 1) 406 var->vsync_len = 1; 407 408 return 0; 409} 410 411static int 412acornfb_validate_timing(struct fb_var_screeninfo *var, 413 struct fb_monspecs *monspecs) 414{ 415 unsigned long hs, vs; 416 417 /* 418 * hs(Hz) = 10^12 / (pixclock * xtotal) 419 * vs(Hz) = hs(Hz) / ytotal 420 * 421 * No need to do long long divisions or anything 422 * like that if you factor it correctly 423 */ 424 hs = 1953125000 / var->pixclock; 425 hs = hs * 512 / 426 (var->xres + var->left_margin + var->right_margin + var->hsync_len); 427 vs = hs / 428 (var->yres + var->upper_margin + var->lower_margin + var->vsync_len); 429 430 return (vs >= monspecs->vfmin && vs <= monspecs->vfmax && 431 hs >= monspecs->hfmin && hs <= monspecs->hfmax) ? 0 : -EINVAL; 432} 433 434static inline void 435acornfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var) 436{ 437 u_int off = var->yoffset * info->fix.line_length; 438 439#if defined(HAS_MEMC) 440 memc_write(VDMA_INIT, off >> 2); 441#elif defined(HAS_IOMD) 442 iomd_writel(info->fix.smem_start + off, IOMD_VIDINIT); 443#endif 444} 445 446static int 447acornfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 448{ 449 u_int fontht; 450 int err; 451 452 /* 453 * FIXME: Find the font height 454 */ 455 fontht = 8; 456 457 var->red.msb_right = 0; 458 var->green.msb_right = 0; 459 var->blue.msb_right = 0; 460 var->transp.msb_right = 0; 461 462 switch (var->bits_per_pixel) { 463 case 1: case 2: case 4: case 8: 464 var->red.offset = 0; 465 var->red.length = var->bits_per_pixel; 466 var->green = var->red; 467 var->blue = var->red; 468 var->transp.offset = 0; 469 var->transp.length = 0; 470 break; 471 472#ifdef HAS_VIDC20 473 case 16: 474 var->red.offset = 0; 475 var->red.length = 5; 476 var->green.offset = 5; 477 var->green.length = 5; 478 var->blue.offset = 10; 479 var->blue.length = 5; 480 var->transp.offset = 15; 481 var->transp.length = 1; 482 break; 483 484 case 32: 485 var->red.offset = 0; 486 var->red.length = 8; 487 var->green.offset = 8; 488 var->green.length = 8; 489 var->blue.offset = 16; 490 var->blue.length = 8; 491 var->transp.offset = 24; 492 var->transp.length = 4; 493 break; 494#endif 495 default: 496 return -EINVAL; 497 } 498 499 /* 500 * Check to see if the pixel rate is valid. 501 */ 502 if (!acornfb_valid_pixrate(var)) 503 return -EINVAL; 504 505 /* 506 * Validate and adjust the resolution to 507 * match the video generator hardware. 508 */ 509 err = acornfb_adjust_timing(info, var, fontht); 510 if (err) 511 return err; 512 513 /* 514 * Validate the timing against the 515 * monitor hardware. 516 */ 517 return acornfb_validate_timing(var, &info->monspecs); 518} 519 520static int acornfb_set_par(struct fb_info *info) 521{ 522 switch (info->var.bits_per_pixel) { 523 case 1: 524 current_par.palette_size = 2; 525 info->fix.visual = FB_VISUAL_MONO10; 526 break; 527 case 2: 528 current_par.palette_size = 4; 529 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 530 break; 531 case 4: 532 current_par.palette_size = 16; 533 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 534 break; 535 case 8: 536 current_par.palette_size = VIDC_PALETTE_SIZE; 537 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 538 break; 539#ifdef HAS_VIDC20 540 case 16: 541 current_par.palette_size = 32; 542 info->fix.visual = FB_VISUAL_DIRECTCOLOR; 543 break; 544 case 32: 545 current_par.palette_size = VIDC_PALETTE_SIZE; 546 info->fix.visual = FB_VISUAL_DIRECTCOLOR; 547 break; 548#endif 549 default: 550 BUG(); 551 } 552 553 info->fix.line_length = (info->var.xres * info->var.bits_per_pixel) / 8; 554 555#if defined(HAS_MEMC) 556 { 557 unsigned long size = info->fix.smem_len - VDMA_XFERSIZE; 558 559 memc_write(VDMA_START, 0); 560 memc_write(VDMA_END, size >> 2); 561 } 562#elif defined(HAS_IOMD) 563 { 564 unsigned long start, size; 565 u_int control; 566 567 start = info->fix.smem_start; 568 size = current_par.screen_end; 569 570 if (current_par.using_vram) { 571 size -= current_par.vram_half_sam; 572 control = DMA_CR_E | (current_par.vram_half_sam / 256); 573 } else { 574 size -= 16; 575 control = DMA_CR_E | DMA_CR_D | 16; 576 } 577 578 iomd_writel(start, IOMD_VIDSTART); 579 iomd_writel(size, IOMD_VIDEND); 580 iomd_writel(control, IOMD_VIDCR); 581 } 582#endif 583 584 acornfb_update_dma(info, &info->var); 585 acornfb_set_timing(info); 586 587 return 0; 588} 589 590static int 591acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) 592{ 593 u_int y_bottom = var->yoffset; 594 595 if (!(var->vmode & FB_VMODE_YWRAP)) 596 y_bottom += info->var.yres; 597 598 if (y_bottom > info->var.yres_virtual) 599 return -EINVAL; 600 601 acornfb_update_dma(info, var); 602 603 return 0; 604} 605 606static const struct fb_ops acornfb_ops = { 607 .owner = THIS_MODULE, 608 FB_DEFAULT_IOMEM_OPS, 609 .fb_check_var = acornfb_check_var, 610 .fb_set_par = acornfb_set_par, 611 .fb_setcolreg = acornfb_setcolreg, 612 .fb_pan_display = acornfb_pan_display, 613}; 614 615/* 616 * Everything after here is initialisation!!! 617 */ 618static struct fb_videomode modedb[] = { 619 { /* 320x256 @ 50Hz */ 620 NULL, 50, 320, 256, 125000, 92, 62, 35, 19, 38, 2, 621 FB_SYNC_COMP_HIGH_ACT, 622 FB_VMODE_NONINTERLACED 623 }, { /* 640x250 @ 50Hz, 15.6 kHz hsync */ 624 NULL, 50, 640, 250, 62500, 185, 123, 38, 21, 76, 3, 625 0, 626 FB_VMODE_NONINTERLACED 627 }, { /* 640x256 @ 50Hz, 15.6 kHz hsync */ 628 NULL, 50, 640, 256, 62500, 185, 123, 35, 18, 76, 3, 629 0, 630 FB_VMODE_NONINTERLACED 631 }, { /* 640x512 @ 50Hz, 26.8 kHz hsync */ 632 NULL, 50, 640, 512, 41667, 113, 87, 18, 1, 56, 3, 633 0, 634 FB_VMODE_NONINTERLACED 635 }, { /* 640x250 @ 70Hz, 31.5 kHz hsync */ 636 NULL, 70, 640, 250, 39722, 48, 16, 109, 88, 96, 2, 637 0, 638 FB_VMODE_NONINTERLACED 639 }, { /* 640x256 @ 70Hz, 31.5 kHz hsync */ 640 NULL, 70, 640, 256, 39722, 48, 16, 106, 85, 96, 2, 641 0, 642 FB_VMODE_NONINTERLACED 643 }, { /* 640x352 @ 70Hz, 31.5 kHz hsync */ 644 NULL, 70, 640, 352, 39722, 48, 16, 58, 37, 96, 2, 645 0, 646 FB_VMODE_NONINTERLACED 647 }, { /* 640x480 @ 60Hz, 31.5 kHz hsync */ 648 NULL, 60, 640, 480, 39722, 48, 16, 32, 11, 96, 2, 649 0, 650 FB_VMODE_NONINTERLACED 651 }, { /* 800x600 @ 56Hz, 35.2 kHz hsync */ 652 NULL, 56, 800, 600, 27778, 101, 23, 22, 1, 100, 2, 653 0, 654 FB_VMODE_NONINTERLACED 655 }, { /* 896x352 @ 60Hz, 21.8 kHz hsync */ 656 NULL, 60, 896, 352, 41667, 59, 27, 9, 0, 118, 3, 657 0, 658 FB_VMODE_NONINTERLACED 659 }, { /* 1024x 768 @ 60Hz, 48.4 kHz hsync */ 660 NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6, 661 0, 662 FB_VMODE_NONINTERLACED 663 }, { /* 1280x1024 @ 60Hz, 63.8 kHz hsync */ 664 NULL, 60, 1280, 1024, 9090, 186, 96, 38, 1, 160, 3, 665 0, 666 FB_VMODE_NONINTERLACED 667 } 668}; 669 670static struct fb_videomode acornfb_default_mode = { 671 .name = NULL, 672 .refresh = 60, 673 .xres = 640, 674 .yres = 480, 675 .pixclock = 39722, 676 .left_margin = 56, 677 .right_margin = 16, 678 .upper_margin = 34, 679 .lower_margin = 9, 680 .hsync_len = 88, 681 .vsync_len = 2, 682 .sync = 0, 683 .vmode = FB_VMODE_NONINTERLACED 684}; 685 686static void acornfb_init_fbinfo(void) 687{ 688 static int first = 1; 689 690 if (!first) 691 return; 692 first = 0; 693 694 fb_info.fbops = &acornfb_ops; 695 fb_info.flags = FBINFO_HWACCEL_YPAN; 696 fb_info.pseudo_palette = current_par.pseudo_palette; 697 698 strcpy(fb_info.fix.id, "Acorn"); 699 fb_info.fix.type = FB_TYPE_PACKED_PIXELS; 700 fb_info.fix.type_aux = 0; 701 fb_info.fix.xpanstep = 0; 702 fb_info.fix.ypanstep = 1; 703 fb_info.fix.ywrapstep = 1; 704 fb_info.fix.line_length = 0; 705 fb_info.fix.accel = FB_ACCEL_NONE; 706 707 /* 708 * setup initial parameters 709 */ 710 memset(&fb_info.var, 0, sizeof(fb_info.var)); 711 712#if defined(HAS_VIDC20) 713 fb_info.var.red.length = 8; 714 fb_info.var.transp.length = 4; 715#endif 716 fb_info.var.green = fb_info.var.red; 717 fb_info.var.blue = fb_info.var.red; 718 fb_info.var.nonstd = 0; 719 fb_info.var.activate = FB_ACTIVATE_NOW; 720 fb_info.var.height = -1; 721 fb_info.var.width = -1; 722 fb_info.var.vmode = FB_VMODE_NONINTERLACED; 723 fb_info.var.accel_flags = FB_ACCELF_TEXT; 724 725 current_par.dram_size = 0; 726 current_par.montype = -1; 727 current_par.dpms = 0; 728} 729 730/* 731 * setup acornfb options: 732 * 733 * mon:hmin-hmax:vmin-vmax:dpms:width:height 734 * Set monitor parameters: 735 * hmin = horizontal minimum frequency (Hz) 736 * hmax = horizontal maximum frequency (Hz) (optional) 737 * vmin = vertical minimum frequency (Hz) 738 * vmax = vertical maximum frequency (Hz) (optional) 739 * dpms = DPMS supported? (optional) 740 * width = width of picture in mm. (optional) 741 * height = height of picture in mm. (optional) 742 * 743 * montype:type 744 * Set RISC-OS style monitor type: 745 * 0 (or tv) - TV frequency 746 * 1 (or multi) - Multi frequency 747 * 2 (or hires) - Hi-res monochrome 748 * 3 (or vga) - VGA 749 * 4 (or svga) - SVGA 750 * auto, or option missing 751 * - try hardware detect 752 * 753 * dram:size 754 * Set the amount of DRAM to use for the frame buffer 755 * (even if you have VRAM). 756 * size can optionally be followed by 'M' or 'K' for 757 * MB or KB respectively. 758 */ 759static void acornfb_parse_mon(char *opt) 760{ 761 char *p = opt; 762 763 current_par.montype = -2; 764 765 fb_info.monspecs.hfmin = simple_strtoul(p, &p, 0); 766 if (*p == '-') 767 fb_info.monspecs.hfmax = simple_strtoul(p + 1, &p, 0); 768 else 769 fb_info.monspecs.hfmax = fb_info.monspecs.hfmin; 770 771 if (*p != ':') 772 goto bad; 773 774 fb_info.monspecs.vfmin = simple_strtoul(p + 1, &p, 0); 775 if (*p == '-') 776 fb_info.monspecs.vfmax = simple_strtoul(p + 1, &p, 0); 777 else 778 fb_info.monspecs.vfmax = fb_info.monspecs.vfmin; 779 780 if (*p != ':') 781 goto check_values; 782 783 fb_info.monspecs.dpms = simple_strtoul(p + 1, &p, 0); 784 785 if (*p != ':') 786 goto check_values; 787 788 fb_info.var.width = simple_strtoul(p + 1, &p, 0); 789 790 if (*p != ':') 791 goto check_values; 792 793 fb_info.var.height = simple_strtoul(p + 1, NULL, 0); 794 795check_values: 796 if (fb_info.monspecs.hfmax < fb_info.monspecs.hfmin || 797 fb_info.monspecs.vfmax < fb_info.monspecs.vfmin) 798 goto bad; 799 return; 800 801bad: 802 printk(KERN_ERR "Acornfb: bad monitor settings: %s\n", opt); 803 current_par.montype = -1; 804} 805 806static void acornfb_parse_montype(char *opt) 807{ 808 current_par.montype = -2; 809 810 if (strncmp(opt, "tv", 2) == 0) { 811 opt += 2; 812 current_par.montype = 0; 813 } else if (strncmp(opt, "multi", 5) == 0) { 814 opt += 5; 815 current_par.montype = 1; 816 } else if (strncmp(opt, "hires", 5) == 0) { 817 opt += 5; 818 current_par.montype = 2; 819 } else if (strncmp(opt, "vga", 3) == 0) { 820 opt += 3; 821 current_par.montype = 3; 822 } else if (strncmp(opt, "svga", 4) == 0) { 823 opt += 4; 824 current_par.montype = 4; 825 } else if (strncmp(opt, "auto", 4) == 0) { 826 opt += 4; 827 current_par.montype = -1; 828 } else if (isdigit(*opt)) 829 current_par.montype = simple_strtoul(opt, &opt, 0); 830 831 if (current_par.montype == -2 || 832 current_par.montype > NR_MONTYPES) { 833 printk(KERN_ERR "acornfb: unknown monitor type: %s\n", 834 opt); 835 current_par.montype = -1; 836 } else 837 if (opt && *opt) { 838 if (strcmp(opt, ",dpms") == 0) 839 current_par.dpms = 1; 840 else 841 printk(KERN_ERR 842 "acornfb: unknown monitor option: %s\n", 843 opt); 844 } 845} 846 847static void acornfb_parse_dram(char *opt) 848{ 849 unsigned int size; 850 851 size = simple_strtoul(opt, &opt, 0); 852 853 if (opt) { 854 switch (*opt) { 855 case 'M': 856 case 'm': 857 size *= 1024; 858 fallthrough; 859 case 'K': 860 case 'k': 861 size *= 1024; 862 default: 863 break; 864 } 865 } 866 867 current_par.dram_size = size; 868} 869 870static struct options { 871 char *name; 872 void (*parse)(char *opt); 873} opt_table[] = { 874 { "mon", acornfb_parse_mon }, 875 { "montype", acornfb_parse_montype }, 876 { "dram", acornfb_parse_dram }, 877 { NULL, NULL } 878}; 879 880static int acornfb_setup(char *options) 881{ 882 struct options *optp; 883 char *opt; 884 885 if (!options || !*options) 886 return 0; 887 888 acornfb_init_fbinfo(); 889 890 while ((opt = strsep(&options, ",")) != NULL) { 891 if (!*opt) 892 continue; 893 894 for (optp = opt_table; optp->name; optp++) { 895 int optlen; 896 897 optlen = strlen(optp->name); 898 899 if (strncmp(opt, optp->name, optlen) == 0 && 900 opt[optlen] == ':') { 901 optp->parse(opt + optlen + 1); 902 break; 903 } 904 } 905 906 if (!optp->name) 907 printk(KERN_ERR "acornfb: unknown parameter: %s\n", 908 opt); 909 } 910 return 0; 911} 912 913/* 914 * Detect type of monitor connected 915 * For now, we just assume SVGA 916 */ 917static int acornfb_detect_monitortype(void) 918{ 919 return 4; 920} 921 922static int acornfb_probe(struct platform_device *dev) 923{ 924 unsigned long size; 925 u_int h_sync, v_sync; 926 int rc, i; 927 char *option = NULL; 928 929 if (fb_get_options("acornfb", &option)) 930 return -ENODEV; 931 acornfb_setup(option); 932 933 acornfb_init_fbinfo(); 934 935 current_par.dev = &dev->dev; 936 937 if (current_par.montype == -1) 938 current_par.montype = acornfb_detect_monitortype(); 939 940 if (current_par.montype == -1 || current_par.montype > NR_MONTYPES) 941 current_par.montype = 4; 942 943 if (current_par.montype >= 0) { 944 fb_info.monspecs = monspecs[current_par.montype]; 945 fb_info.monspecs.dpms = current_par.dpms; 946 } 947 948 /* 949 * Try to select a suitable default mode 950 */ 951 for (i = 0; i < ARRAY_SIZE(modedb); i++) { 952 unsigned long hs; 953 954 hs = modedb[i].refresh * 955 (modedb[i].yres + modedb[i].upper_margin + 956 modedb[i].lower_margin + modedb[i].vsync_len); 957 if (modedb[i].xres == DEFAULT_XRES && 958 modedb[i].yres == DEFAULT_YRES && 959 modedb[i].refresh >= fb_info.monspecs.vfmin && 960 modedb[i].refresh <= fb_info.monspecs.vfmax && 961 hs >= fb_info.monspecs.hfmin && 962 hs <= fb_info.monspecs.hfmax) { 963 acornfb_default_mode = modedb[i]; 964 break; 965 } 966 } 967 968 fb_info.screen_base = (char *)SCREEN_BASE; 969 fb_info.fix.smem_start = SCREEN_START; 970 current_par.using_vram = 0; 971 972 /* 973 * If vram_size is set, we are using VRAM in 974 * a Risc PC. However, if the user has specified 975 * an amount of DRAM then use that instead. 976 */ 977 if (vram_size && !current_par.dram_size) { 978 size = vram_size; 979 current_par.vram_half_sam = vram_size / 1024; 980 current_par.using_vram = 1; 981 } else if (current_par.dram_size) 982 size = current_par.dram_size; 983 else 984 size = MAX_SIZE; 985 986 /* 987 * Limit maximum screen size. 988 */ 989 if (size > MAX_SIZE) 990 size = MAX_SIZE; 991 992 size = PAGE_ALIGN(size); 993 994#if defined(HAS_VIDC20) 995 if (!current_par.using_vram) { 996 dma_addr_t handle; 997 void *base; 998 999 /* 1000 * RiscPC needs to allocate the DRAM memory 1001 * for the framebuffer if we are not using 1002 * VRAM. 1003 */ 1004 base = dma_alloc_wc(current_par.dev, size, &handle, 1005 GFP_KERNEL); 1006 if (base == NULL) { 1007 printk(KERN_ERR "acornfb: unable to allocate screen memory\n"); 1008 return -ENOMEM; 1009 } 1010 1011 fb_info.screen_base = base; 1012 fb_info.fix.smem_start = handle; 1013 } 1014#endif 1015 fb_info.fix.smem_len = size; 1016 current_par.palette_size = VIDC_PALETTE_SIZE; 1017 1018 /* 1019 * Lookup the timing for this resolution. If we can't 1020 * find it, then we can't restore it if we change 1021 * the resolution, so we disable this feature. 1022 */ 1023 do { 1024 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb, 1025 ARRAY_SIZE(modedb), 1026 &acornfb_default_mode, DEFAULT_BPP); 1027 /* 1028 * If we found an exact match, all ok. 1029 */ 1030 if (rc == 1) 1031 break; 1032 1033 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0, 1034 &acornfb_default_mode, DEFAULT_BPP); 1035 /* 1036 * If we found an exact match, all ok. 1037 */ 1038 if (rc == 1) 1039 break; 1040 1041 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb, 1042 ARRAY_SIZE(modedb), 1043 &acornfb_default_mode, DEFAULT_BPP); 1044 if (rc) 1045 break; 1046 1047 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0, 1048 &acornfb_default_mode, DEFAULT_BPP); 1049 } while (0); 1050 1051 /* 1052 * If we didn't find an exact match, try the 1053 * generic database. 1054 */ 1055 if (rc == 0) { 1056 printk("Acornfb: no valid mode found\n"); 1057 return -EINVAL; 1058 } 1059 1060 h_sync = 1953125000 / fb_info.var.pixclock; 1061 h_sync = h_sync * 512 / (fb_info.var.xres + fb_info.var.left_margin + 1062 fb_info.var.right_margin + fb_info.var.hsync_len); 1063 v_sync = h_sync / (fb_info.var.yres + fb_info.var.upper_margin + 1064 fb_info.var.lower_margin + fb_info.var.vsync_len); 1065 1066 printk(KERN_INFO "Acornfb: %dkB %cRAM, %s, using %dx%d, %d.%03dkHz, %dHz\n", 1067 fb_info.fix.smem_len / 1024, 1068 current_par.using_vram ? 'V' : 'D', 1069 VIDC_NAME, fb_info.var.xres, fb_info.var.yres, 1070 h_sync / 1000, h_sync % 1000, v_sync); 1071 1072 printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%s\n", 1073 fb_info.monspecs.hfmin / 1000, fb_info.monspecs.hfmin % 1000, 1074 fb_info.monspecs.hfmax / 1000, fb_info.monspecs.hfmax % 1000, 1075 fb_info.monspecs.vfmin, fb_info.monspecs.vfmax, 1076 fb_info.monspecs.dpms ? ", DPMS" : ""); 1077 1078 if (fb_set_var(&fb_info, &fb_info.var)) 1079 printk(KERN_ERR "Acornfb: unable to set display parameters\n"); 1080 1081 if (register_framebuffer(&fb_info) < 0) 1082 return -EINVAL; 1083 return 0; 1084} 1085 1086static struct platform_driver acornfb_driver = { 1087 .probe = acornfb_probe, 1088 .driver = { 1089 .name = "acornfb", 1090 }, 1091}; 1092 1093static int __init acornfb_init(void) 1094{ 1095 return platform_driver_register(&acornfb_driver); 1096} 1097 1098module_init(acornfb_init); 1099 1100MODULE_AUTHOR("Russell King"); 1101MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver"); 1102MODULE_LICENSE("GPL");
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