1 /* 2 * Frame buffer device for IBM GXT4500P/6500P and GXT4000P/6000P 3 * display adaptors 4 * 5 * Copyright (C) 2006 Paul Mackerras, IBM Corp. <paulus@samba.org> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/fb.h> 11 #include <linux/console.h> 12 #include <linux/pci.h> 13 #include <linux/pci_ids.h> 14 #include <linux/delay.h> 15 #include <linux/string.h> 16 17 #define PCI_DEVICE_ID_IBM_GXT4500P 0x21c 18 #define PCI_DEVICE_ID_IBM_GXT6500P 0x21b 19 #define PCI_DEVICE_ID_IBM_GXT4000P 0x16e 20 #define PCI_DEVICE_ID_IBM_GXT6000P 0x170 21 22 /* GXT4500P registers */ 23 24 /* Registers in PCI config space */ 25 #define CFG_ENDIAN0 0x40 26 27 /* Misc control/status registers */ 28 #define STATUS 0x1000 29 #define CTRL_REG0 0x1004 30 #define CR0_HALT_DMA 0x4 31 #define CR0_RASTER_RESET 0x8 32 #define CR0_GEOM_RESET 0x10 33 #define CR0_MEM_CTRLER_RESET 0x20 34 35 /* Framebuffer control registers */ 36 #define FB_AB_CTRL 0x1100 37 #define FB_CD_CTRL 0x1104 38 #define FB_WID_CTRL 0x1108 39 #define FB_Z_CTRL 0x110c 40 #define FB_VGA_CTRL 0x1110 41 #define REFRESH_AB_CTRL 0x1114 42 #define REFRESH_CD_CTRL 0x1118 43 #define FB_OVL_CTRL 0x111c 44 #define FB_CTRL_TYPE 0x80000000 45 #define FB_CTRL_WIDTH_MASK 0x007f0000 46 #define FB_CTRL_WIDTH_SHIFT 16 47 #define FB_CTRL_START_SEG_MASK 0x00003fff 48 49 #define REFRESH_START 0x1098 50 #define REFRESH_SIZE 0x109c 51 52 /* "Direct" framebuffer access registers */ 53 #define DFA_FB_A 0x11e0 54 #define DFA_FB_B 0x11e4 55 #define DFA_FB_C 0x11e8 56 #define DFA_FB_D 0x11ec 57 #define DFA_FB_ENABLE 0x80000000 58 #define DFA_FB_BASE_MASK 0x03f00000 59 #define DFA_FB_STRIDE_1k 0x00000000 60 #define DFA_FB_STRIDE_2k 0x00000010 61 #define DFA_FB_STRIDE_4k 0x00000020 62 #define DFA_PIX_8BIT 0x00000000 63 #define DFA_PIX_16BIT_565 0x00000001 64 #define DFA_PIX_16BIT_1555 0x00000002 65 #define DFA_PIX_24BIT 0x00000004 66 #define DFA_PIX_32BIT 0x00000005 67 68 /* maps DFA_PIX_* to pixel size in bytes */ 69 static const unsigned char pixsize[] = { 70 1, 2, 2, 2, 4, 4 71 }; 72 73 /* Display timing generator registers */ 74 #define DTG_CONTROL 0x1900 75 #define DTG_CTL_SCREEN_REFRESH 2 76 #define DTG_CTL_ENABLE 1 77 #define DTG_HORIZ_EXTENT 0x1904 78 #define DTG_HORIZ_DISPLAY 0x1908 79 #define DTG_HSYNC_START 0x190c 80 #define DTG_HSYNC_END 0x1910 81 #define DTG_HSYNC_END_COMP 0x1914 82 #define DTG_VERT_EXTENT 0x1918 83 #define DTG_VERT_DISPLAY 0x191c 84 #define DTG_VSYNC_START 0x1920 85 #define DTG_VSYNC_END 0x1924 86 #define DTG_VERT_SHORT 0x1928 87 88 /* PLL/RAMDAC registers */ 89 #define DISP_CTL 0x402c 90 #define DISP_CTL_OFF 2 91 #define SYNC_CTL 0x4034 92 #define SYNC_CTL_SYNC_ON_RGB 1 93 #define SYNC_CTL_SYNC_OFF 2 94 #define SYNC_CTL_HSYNC_INV 8 95 #define SYNC_CTL_VSYNC_INV 0x10 96 #define SYNC_CTL_HSYNC_OFF 0x20 97 #define SYNC_CTL_VSYNC_OFF 0x40 98 99 #define PLL_M 0x4040 100 #define PLL_N 0x4044 101 #define PLL_POSTDIV 0x4048 102 #define PLL_C 0x404c 103 104 /* Hardware cursor */ 105 #define CURSOR_X 0x4078 106 #define CURSOR_Y 0x407c 107 #define CURSOR_HOTSPOT 0x4080 108 #define CURSOR_MODE 0x4084 109 #define CURSOR_MODE_OFF 0 110 #define CURSOR_MODE_4BPP 1 111 #define CURSOR_PIXMAP 0x5000 112 #define CURSOR_CMAP 0x7400 113 114 /* Window attribute table */ 115 #define WAT_FMT 0x4100 116 #define WAT_FMT_24BIT 0 117 #define WAT_FMT_16BIT_565 1 118 #define WAT_FMT_16BIT_1555 2 119 #define WAT_FMT_32BIT 3 /* 0 vs. 3 is a guess */ 120 #define WAT_FMT_8BIT_332 9 121 #define WAT_FMT_8BIT 0xa 122 #define WAT_FMT_NO_CMAP 4 /* ORd in to other values */ 123 #define WAT_CMAP_OFFSET 0x4104 /* 4-bit value gets << 6 */ 124 #define WAT_CTRL 0x4108 125 #define WAT_CTRL_SEL_B 1 /* select B buffer if 1 */ 126 #define WAT_CTRL_NO_INC 2 127 #define WAT_GAMMA_CTRL 0x410c 128 #define WAT_GAMMA_DISABLE 1 /* disables gamma cmap */ 129 #define WAT_OVL_CTRL 0x430c /* controls overlay */ 130 131 /* Indexed by DFA_PIX_* values */ 132 static const unsigned char watfmt[] = { 133 WAT_FMT_8BIT, WAT_FMT_16BIT_565, WAT_FMT_16BIT_1555, 0, 134 WAT_FMT_24BIT, WAT_FMT_32BIT 135 }; 136 137 /* Colormap array; 1k entries of 4 bytes each */ 138 #define CMAP 0x6000 139 140 #define readreg(par, reg) readl((par)->regs + (reg)) 141 #define writereg(par, reg, val) writel((val), (par)->regs + (reg)) 142 143 struct gxt4500_par { 144 void __iomem *regs; 145 146 int pixfmt; /* pixel format, see DFA_PIX_* values */ 147 148 /* PLL parameters */ 149 int refclk_ps; /* ref clock period in picoseconds */ 150 int pll_m; /* ref clock divisor */ 151 int pll_n; /* VCO divisor */ 152 int pll_pd1; /* first post-divisor */ 153 int pll_pd2; /* second post-divisor */ 154 155 u32 pseudo_palette[16]; /* used in color blits */ 156 }; 157 158 /* mode requested by user */ 159 static char *mode_option; 160 161 /* default mode: 1280x1024 @ 60 Hz, 8 bpp */ 162 static const struct fb_videomode defaultmode = { 163 .refresh = 60, 164 .xres = 1280, 165 .yres = 1024, 166 .pixclock = 9295, 167 .left_margin = 248, 168 .right_margin = 48, 169 .upper_margin = 38, 170 .lower_margin = 1, 171 .hsync_len = 112, 172 .vsync_len = 3, 173 .vmode = FB_VMODE_NONINTERLACED 174 }; 175 176 /* List of supported cards */ 177 enum gxt_cards { 178 GXT4500P, 179 GXT6500P, 180 GXT4000P, 181 GXT6000P 182 }; 183 184 /* Card-specific information */ 185 static const struct cardinfo { 186 int refclk_ps; /* period of PLL reference clock in ps */ 187 const char *cardname; 188 } cardinfo[] = { 189 [GXT4500P] = { .refclk_ps = 9259, .cardname = "IBM GXT4500P" }, 190 [GXT6500P] = { .refclk_ps = 9259, .cardname = "IBM GXT6500P" }, 191 [GXT4000P] = { .refclk_ps = 40000, .cardname = "IBM GXT4000P" }, 192 [GXT6000P] = { .refclk_ps = 40000, .cardname = "IBM GXT6000P" }, 193 }; 194 195 /* 196 * The refclk and VCO dividers appear to use a linear feedback shift 197 * register, which gets reloaded when it reaches a terminal value, at 198 * which point the divider output is toggled. Thus one can obtain 199 * whatever divisor is required by putting the appropriate value into 200 * the reload register. For a divisor of N, one puts the value from 201 * the LFSR sequence that comes N-1 places before the terminal value 202 * into the reload register. 203 */ 204 205 static const unsigned char mdivtab[] = { 206 /* 1 */ 0x3f, 0x00, 0x20, 0x10, 0x28, 0x14, 0x2a, 0x15, 0x0a, 207 /* 10 */ 0x25, 0x32, 0x19, 0x0c, 0x26, 0x13, 0x09, 0x04, 0x22, 0x11, 208 /* 20 */ 0x08, 0x24, 0x12, 0x29, 0x34, 0x1a, 0x2d, 0x36, 0x1b, 0x0d, 209 /* 30 */ 0x06, 0x23, 0x31, 0x38, 0x1c, 0x2e, 0x17, 0x0b, 0x05, 0x02, 210 /* 40 */ 0x21, 0x30, 0x18, 0x2c, 0x16, 0x2b, 0x35, 0x3a, 0x1d, 0x0e, 211 /* 50 */ 0x27, 0x33, 0x39, 0x3c, 0x1e, 0x2f, 0x37, 0x3b, 0x3d, 0x3e, 212 /* 60 */ 0x1f, 0x0f, 0x07, 0x03, 0x01, 213 }; 214 215 static const unsigned char ndivtab[] = { 216 /* 2 */ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0x78, 0xbc, 0x5e, 217 /* 10 */ 0x2f, 0x17, 0x0b, 0x85, 0xc2, 0xe1, 0x70, 0x38, 0x9c, 0x4e, 218 /* 20 */ 0xa7, 0xd3, 0xe9, 0xf4, 0xfa, 0xfd, 0xfe, 0x7f, 0xbf, 0xdf, 219 /* 30 */ 0xef, 0x77, 0x3b, 0x1d, 0x8e, 0xc7, 0xe3, 0x71, 0xb8, 0xdc, 220 /* 40 */ 0x6e, 0xb7, 0x5b, 0x2d, 0x16, 0x8b, 0xc5, 0xe2, 0xf1, 0xf8, 221 /* 50 */ 0xfc, 0x7e, 0x3f, 0x9f, 0xcf, 0x67, 0xb3, 0xd9, 0x6c, 0xb6, 222 /* 60 */ 0xdb, 0x6d, 0x36, 0x9b, 0x4d, 0x26, 0x13, 0x89, 0xc4, 0x62, 223 /* 70 */ 0xb1, 0xd8, 0xec, 0xf6, 0xfb, 0x7d, 0xbe, 0x5f, 0xaf, 0x57, 224 /* 80 */ 0x2b, 0x95, 0x4a, 0x25, 0x92, 0x49, 0xa4, 0x52, 0x29, 0x94, 225 /* 90 */ 0xca, 0x65, 0xb2, 0x59, 0x2c, 0x96, 0xcb, 0xe5, 0xf2, 0x79, 226 /* 100 */ 0x3c, 0x1e, 0x0f, 0x07, 0x83, 0x41, 0x20, 0x90, 0x48, 0x24, 227 /* 110 */ 0x12, 0x09, 0x84, 0x42, 0xa1, 0x50, 0x28, 0x14, 0x8a, 0x45, 228 /* 120 */ 0xa2, 0xd1, 0xe8, 0x74, 0xba, 0xdd, 0xee, 0xf7, 0x7b, 0x3d, 229 /* 130 */ 0x9e, 0x4f, 0x27, 0x93, 0xc9, 0xe4, 0x72, 0x39, 0x1c, 0x0e, 230 /* 140 */ 0x87, 0xc3, 0x61, 0x30, 0x18, 0x8c, 0xc6, 0x63, 0x31, 0x98, 231 /* 150 */ 0xcc, 0xe6, 0x73, 0xb9, 0x5c, 0x2e, 0x97, 0x4b, 0xa5, 0xd2, 232 /* 160 */ 0x69, 233 }; 234 235 static int calc_pll(int period_ps, struct gxt4500_par *par) 236 { 237 int m, n, pdiv1, pdiv2, postdiv; 238 int pll_period, best_error, t, intf; 239 240 /* only deal with range 5MHz - 300MHz */ 241 if (period_ps < 3333 || period_ps > 200000) 242 return -1; 243 244 best_error = 1000000; 245 for (pdiv1 = 1; pdiv1 <= 8; ++pdiv1) { 246 for (pdiv2 = 1; pdiv2 <= pdiv1; ++pdiv2) { 247 postdiv = pdiv1 * pdiv2; 248 pll_period = DIV_ROUND_UP(period_ps, postdiv); 249 /* keep pll in range 350..600 MHz */ 250 if (pll_period < 1666 || pll_period > 2857) 251 continue; 252 for (m = 1; m <= 64; ++m) { 253 intf = m * par->refclk_ps; 254 if (intf > 500000) 255 break; 256 n = intf * postdiv / period_ps; 257 if (n < 3 || n > 160) 258 continue; 259 t = par->refclk_ps * m * postdiv / n; 260 t -= period_ps; 261 if (t >= 0 && t < best_error) { 262 par->pll_m = m; 263 par->pll_n = n; 264 par->pll_pd1 = pdiv1; 265 par->pll_pd2 = pdiv2; 266 best_error = t; 267 } 268 } 269 } 270 } 271 if (best_error == 1000000) 272 return -1; 273 return 0; 274 } 275 276 static int calc_pixclock(struct gxt4500_par *par) 277 { 278 return par->refclk_ps * par->pll_m * par->pll_pd1 * par->pll_pd2 279 / par->pll_n; 280 } 281 282 static int gxt4500_var_to_par(struct fb_var_screeninfo *var, 283 struct gxt4500_par *par) 284 { 285 if (var->xres + var->xoffset > var->xres_virtual || 286 var->yres + var->yoffset > var->yres_virtual || 287 var->xres_virtual > 4096) 288 return -EINVAL; 289 if ((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED) 290 return -EINVAL; 291 292 if (calc_pll(var->pixclock, par) < 0) 293 return -EINVAL; 294 295 switch (var->bits_per_pixel) { 296 case 32: 297 if (var->transp.length) 298 par->pixfmt = DFA_PIX_32BIT; 299 else 300 par->pixfmt = DFA_PIX_24BIT; 301 break; 302 case 24: 303 par->pixfmt = DFA_PIX_24BIT; 304 break; 305 case 16: 306 if (var->green.length == 5) 307 par->pixfmt = DFA_PIX_16BIT_1555; 308 else 309 par->pixfmt = DFA_PIX_16BIT_565; 310 break; 311 case 8: 312 par->pixfmt = DFA_PIX_8BIT; 313 break; 314 default: 315 return -EINVAL; 316 } 317 318 return 0; 319 } 320 321 static const struct fb_bitfield eightbits = {0, 8}; 322 static const struct fb_bitfield nobits = {0, 0}; 323 324 static void gxt4500_unpack_pixfmt(struct fb_var_screeninfo *var, 325 int pixfmt) 326 { 327 var->bits_per_pixel = pixsize[pixfmt] * 8; 328 var->red = eightbits; 329 var->green = eightbits; 330 var->blue = eightbits; 331 var->transp = nobits; 332 333 switch (pixfmt) { 334 case DFA_PIX_16BIT_565: 335 var->red.length = 5; 336 var->green.length = 6; 337 var->blue.length = 5; 338 break; 339 case DFA_PIX_16BIT_1555: 340 var->red.length = 5; 341 var->green.length = 5; 342 var->blue.length = 5; 343 var->transp.length = 1; 344 break; 345 case DFA_PIX_32BIT: 346 var->transp.length = 8; 347 break; 348 } 349 if (pixfmt != DFA_PIX_8BIT) { 350 var->green.offset = var->red.length; 351 var->blue.offset = var->green.offset + var->green.length; 352 if (var->transp.length) 353 var->transp.offset = 354 var->blue.offset + var->blue.length; 355 } 356 } 357 358 static int gxt4500_check_var(struct fb_var_screeninfo *var, 359 struct fb_info *info) 360 { 361 struct gxt4500_par par; 362 int err; 363 364 par = *(struct gxt4500_par *)info->par; 365 err = gxt4500_var_to_par(var, &par); 366 if (!err) { 367 var->pixclock = calc_pixclock(&par); 368 gxt4500_unpack_pixfmt(var, par.pixfmt); 369 } 370 return err; 371 } 372 373 static int gxt4500_set_par(struct fb_info *info) 374 { 375 struct gxt4500_par *par = info->par; 376 struct fb_var_screeninfo *var = &info->var; 377 int err; 378 u32 ctrlreg, tmp; 379 unsigned int dfa_ctl, pixfmt, stride; 380 unsigned int wid_tiles, i; 381 unsigned int prefetch_pix, htot; 382 struct gxt4500_par save_par; 383 384 save_par = *par; 385 err = gxt4500_var_to_par(var, par); 386 if (err) { 387 *par = save_par; 388 return err; 389 } 390 391 /* turn off DTG for now */ 392 ctrlreg = readreg(par, DTG_CONTROL); 393 ctrlreg &= ~(DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH); 394 writereg(par, DTG_CONTROL, ctrlreg); 395 396 /* set PLL registers */ 397 tmp = readreg(par, PLL_C) & ~0x7f; 398 if (par->pll_n < 38) 399 tmp |= 0x29; 400 if (par->pll_n < 69) 401 tmp |= 0x35; 402 else if (par->pll_n < 100) 403 tmp |= 0x76; 404 else 405 tmp |= 0x7e; 406 writereg(par, PLL_C, tmp); 407 writereg(par, PLL_M, mdivtab[par->pll_m - 1]); 408 writereg(par, PLL_N, ndivtab[par->pll_n - 2]); 409 tmp = ((8 - par->pll_pd2) << 3) | (8 - par->pll_pd1); 410 if (par->pll_pd1 == 8 || par->pll_pd2 == 8) { 411 /* work around erratum */ 412 writereg(par, PLL_POSTDIV, tmp | 0x9); 413 udelay(1); 414 } 415 writereg(par, PLL_POSTDIV, tmp); 416 msleep(20); 417 418 /* turn off hardware cursor */ 419 writereg(par, CURSOR_MODE, CURSOR_MODE_OFF); 420 421 /* reset raster engine */ 422 writereg(par, CTRL_REG0, CR0_RASTER_RESET | (CR0_RASTER_RESET << 16)); 423 udelay(10); 424 writereg(par, CTRL_REG0, CR0_RASTER_RESET << 16); 425 426 /* set display timing generator registers */ 427 htot = var->xres + var->left_margin + var->right_margin + 428 var->hsync_len; 429 writereg(par, DTG_HORIZ_EXTENT, htot - 1); 430 writereg(par, DTG_HORIZ_DISPLAY, var->xres - 1); 431 writereg(par, DTG_HSYNC_START, var->xres + var->right_margin - 1); 432 writereg(par, DTG_HSYNC_END, 433 var->xres + var->right_margin + var->hsync_len - 1); 434 writereg(par, DTG_HSYNC_END_COMP, 435 var->xres + var->right_margin + var->hsync_len - 1); 436 writereg(par, DTG_VERT_EXTENT, 437 var->yres + var->upper_margin + var->lower_margin + 438 var->vsync_len - 1); 439 writereg(par, DTG_VERT_DISPLAY, var->yres - 1); 440 writereg(par, DTG_VSYNC_START, var->yres + var->lower_margin - 1); 441 writereg(par, DTG_VSYNC_END, 442 var->yres + var->lower_margin + var->vsync_len - 1); 443 prefetch_pix = 3300000 / var->pixclock; 444 if (prefetch_pix >= htot) 445 prefetch_pix = htot - 1; 446 writereg(par, DTG_VERT_SHORT, htot - prefetch_pix - 1); 447 ctrlreg |= DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH; 448 writereg(par, DTG_CONTROL, ctrlreg); 449 450 /* calculate stride in DFA aperture */ 451 if (var->xres_virtual > 2048) { 452 stride = 4096; 453 dfa_ctl = DFA_FB_STRIDE_4k; 454 } else if (var->xres_virtual > 1024) { 455 stride = 2048; 456 dfa_ctl = DFA_FB_STRIDE_2k; 457 } else { 458 stride = 1024; 459 dfa_ctl = DFA_FB_STRIDE_1k; 460 } 461 462 /* Set up framebuffer definition */ 463 wid_tiles = (var->xres_virtual + 63) >> 6; 464 465 /* XXX add proper FB allocation here someday */ 466 writereg(par, FB_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); 467 writereg(par, REFRESH_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); 468 writereg(par, FB_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); 469 writereg(par, REFRESH_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); 470 writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset); 471 writereg(par, REFRESH_SIZE, (var->xres << 16) | var->yres); 472 473 /* Set up framebuffer access by CPU */ 474 475 pixfmt = par->pixfmt; 476 dfa_ctl |= DFA_FB_ENABLE | pixfmt; 477 writereg(par, DFA_FB_A, dfa_ctl); 478 479 /* 480 * Set up window attribute table. 481 * We set all WAT entries the same so it doesn't matter what the 482 * window ID (WID) plane contains. 483 */ 484 for (i = 0; i < 32; ++i) { 485 writereg(par, WAT_FMT + (i << 4), watfmt[pixfmt]); 486 writereg(par, WAT_CMAP_OFFSET + (i << 4), 0); 487 writereg(par, WAT_CTRL + (i << 4), 0); 488 writereg(par, WAT_GAMMA_CTRL + (i << 4), WAT_GAMMA_DISABLE); 489 } 490 491 /* Set sync polarity etc. */ 492 ctrlreg = readreg(par, SYNC_CTL) & 493 ~(SYNC_CTL_SYNC_ON_RGB | SYNC_CTL_HSYNC_INV | 494 SYNC_CTL_VSYNC_INV); 495 if (var->sync & FB_SYNC_ON_GREEN) 496 ctrlreg |= SYNC_CTL_SYNC_ON_RGB; 497 if (!(var->sync & FB_SYNC_HOR_HIGH_ACT)) 498 ctrlreg |= SYNC_CTL_HSYNC_INV; 499 if (!(var->sync & FB_SYNC_VERT_HIGH_ACT)) 500 ctrlreg |= SYNC_CTL_VSYNC_INV; 501 writereg(par, SYNC_CTL, ctrlreg); 502 503 info->fix.line_length = stride * pixsize[pixfmt]; 504 info->fix.visual = (pixfmt == DFA_PIX_8BIT)? FB_VISUAL_PSEUDOCOLOR: 505 FB_VISUAL_DIRECTCOLOR; 506 507 return 0; 508 } 509 510 static int gxt4500_setcolreg(unsigned int reg, unsigned int red, 511 unsigned int green, unsigned int blue, 512 unsigned int transp, struct fb_info *info) 513 { 514 u32 cmap_entry; 515 struct gxt4500_par *par = info->par; 516 517 if (reg > 1023) 518 return 1; 519 cmap_entry = ((transp & 0xff00) << 16) | ((red & 0xff00) << 8) | 520 (green & 0xff00) | (blue >> 8); 521 writereg(par, CMAP + reg * 4, cmap_entry); 522 523 if (reg < 16 && par->pixfmt != DFA_PIX_8BIT) { 524 u32 *pal = info->pseudo_palette; 525 u32 val = reg; 526 switch (par->pixfmt) { 527 case DFA_PIX_16BIT_565: 528 val |= (reg << 11) | (reg << 6); 529 break; 530 case DFA_PIX_16BIT_1555: 531 val |= (reg << 10) | (reg << 5); 532 break; 533 case DFA_PIX_32BIT: 534 val |= (reg << 24); 535 /* fall through */ 536 case DFA_PIX_24BIT: 537 val |= (reg << 16) | (reg << 8); 538 break; 539 } 540 pal[reg] = val; 541 } 542 543 return 0; 544 } 545 546 static int gxt4500_pan_display(struct fb_var_screeninfo *var, 547 struct fb_info *info) 548 { 549 struct gxt4500_par *par = info->par; 550 551 if (var->xoffset & 7) 552 return -EINVAL; 553 if (var->xoffset + info->var.xres > info->var.xres_virtual || 554 var->yoffset + info->var.yres > info->var.yres_virtual) 555 return -EINVAL; 556 557 writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset); 558 return 0; 559 } 560 561 static int gxt4500_blank(int blank, struct fb_info *info) 562 { 563 struct gxt4500_par *par = info->par; 564 int ctrl, dctl; 565 566 ctrl = readreg(par, SYNC_CTL); 567 ctrl &= ~(SYNC_CTL_SYNC_OFF | SYNC_CTL_HSYNC_OFF | SYNC_CTL_VSYNC_OFF); 568 dctl = readreg(par, DISP_CTL); 569 dctl |= DISP_CTL_OFF; 570 switch (blank) { 571 case FB_BLANK_UNBLANK: 572 dctl &= ~DISP_CTL_OFF; 573 break; 574 case FB_BLANK_POWERDOWN: 575 ctrl |= SYNC_CTL_SYNC_OFF; 576 break; 577 case FB_BLANK_HSYNC_SUSPEND: 578 ctrl |= SYNC_CTL_HSYNC_OFF; 579 break; 580 case FB_BLANK_VSYNC_SUSPEND: 581 ctrl |= SYNC_CTL_VSYNC_OFF; 582 break; 583 default: ; 584 } 585 writereg(par, SYNC_CTL, ctrl); 586 writereg(par, DISP_CTL, dctl); 587 588 return 0; 589 } 590 591 static const struct fb_fix_screeninfo gxt4500_fix = { 592 .id = "IBM GXT4500P", 593 .type = FB_TYPE_PACKED_PIXELS, 594 .visual = FB_VISUAL_PSEUDOCOLOR, 595 .xpanstep = 8, 596 .ypanstep = 1, 597 .mmio_len = 0x20000, 598 }; 599 600 static struct fb_ops gxt4500_ops = { 601 .owner = THIS_MODULE, 602 .fb_check_var = gxt4500_check_var, 603 .fb_set_par = gxt4500_set_par, 604 .fb_setcolreg = gxt4500_setcolreg, 605 .fb_pan_display = gxt4500_pan_display, 606 .fb_blank = gxt4500_blank, 607 .fb_fillrect = cfb_fillrect, 608 .fb_copyarea = cfb_copyarea, 609 .fb_imageblit = cfb_imageblit, 610 }; 611 612 /* PCI functions */ 613 static int gxt4500_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 614 { 615 int err; 616 unsigned long reg_phys, fb_phys; 617 struct gxt4500_par *par; 618 struct fb_info *info; 619 struct fb_var_screeninfo var; 620 enum gxt_cards cardtype; 621 622 err = pci_enable_device(pdev); 623 if (err) { 624 dev_err(&pdev->dev, "gxt4500: cannot enable PCI device: %d\n", 625 err); 626 return err; 627 } 628 629 reg_phys = pci_resource_start(pdev, 0); 630 if (!request_mem_region(reg_phys, pci_resource_len(pdev, 0), 631 "gxt4500 regs")) { 632 dev_err(&pdev->dev, "gxt4500: cannot get registers\n"); 633 goto err_nodev; 634 } 635 636 fb_phys = pci_resource_start(pdev, 1); 637 if (!request_mem_region(fb_phys, pci_resource_len(pdev, 1), 638 "gxt4500 FB")) { 639 dev_err(&pdev->dev, "gxt4500: cannot get framebuffer\n"); 640 goto err_free_regs; 641 } 642 643 info = framebuffer_alloc(sizeof(struct gxt4500_par), &pdev->dev); 644 if (!info) { 645 dev_err(&pdev->dev, "gxt4500: cannot alloc FB info record\n"); 646 goto err_free_fb; 647 } 648 par = info->par; 649 cardtype = ent->driver_data; 650 par->refclk_ps = cardinfo[cardtype].refclk_ps; 651 info->fix = gxt4500_fix; 652 strlcpy(info->fix.id, cardinfo[cardtype].cardname, 653 sizeof(info->fix.id)); 654 info->pseudo_palette = par->pseudo_palette; 655 656 info->fix.mmio_start = reg_phys; 657 par->regs = pci_ioremap_bar(pdev, 0); 658 if (!par->regs) { 659 dev_err(&pdev->dev, "gxt4500: cannot map registers\n"); 660 goto err_free_all; 661 } 662 663 info->fix.smem_start = fb_phys; 664 info->fix.smem_len = pci_resource_len(pdev, 1); 665 info->screen_base = pci_ioremap_bar(pdev, 1); 666 if (!info->screen_base) { 667 dev_err(&pdev->dev, "gxt4500: cannot map framebuffer\n"); 668 goto err_unmap_regs; 669 } 670 671 pci_set_drvdata(pdev, info); 672 673 /* Set byte-swapping for DFA aperture for all pixel sizes */ 674 pci_write_config_dword(pdev, CFG_ENDIAN0, 0x333300); 675 676 info->fbops = &gxt4500_ops; 677 info->flags = FBINFO_FLAG_DEFAULT; 678 679 err = fb_alloc_cmap(&info->cmap, 256, 0); 680 if (err) { 681 dev_err(&pdev->dev, "gxt4500: cannot allocate cmap\n"); 682 goto err_unmap_all; 683 } 684 685 gxt4500_blank(FB_BLANK_UNBLANK, info); 686 687 if (!fb_find_mode(&var, info, mode_option, NULL, 0, &defaultmode, 8)) { 688 dev_err(&pdev->dev, "gxt4500: cannot find valid video mode\n"); 689 goto err_free_cmap; 690 } 691 info->var = var; 692 if (gxt4500_set_par(info)) { 693 printk(KERN_ERR "gxt4500: cannot set video mode\n"); 694 goto err_free_cmap; 695 } 696 697 if (register_framebuffer(info) < 0) { 698 dev_err(&pdev->dev, "gxt4500: cannot register framebuffer\n"); 699 goto err_free_cmap; 700 } 701 fb_info(info, "%s frame buffer device\n", info->fix.id); 702 703 return 0; 704 705 err_free_cmap: 706 fb_dealloc_cmap(&info->cmap); 707 err_unmap_all: 708 iounmap(info->screen_base); 709 err_unmap_regs: 710 iounmap(par->regs); 711 err_free_all: 712 framebuffer_release(info); 713 err_free_fb: 714 release_mem_region(fb_phys, pci_resource_len(pdev, 1)); 715 err_free_regs: 716 release_mem_region(reg_phys, pci_resource_len(pdev, 0)); 717 err_nodev: 718 return -ENODEV; 719 } 720 721 static void gxt4500_remove(struct pci_dev *pdev) 722 { 723 struct fb_info *info = pci_get_drvdata(pdev); 724 struct gxt4500_par *par; 725 726 if (!info) 727 return; 728 par = info->par; 729 unregister_framebuffer(info); 730 fb_dealloc_cmap(&info->cmap); 731 iounmap(par->regs); 732 iounmap(info->screen_base); 733 release_mem_region(pci_resource_start(pdev, 0), 734 pci_resource_len(pdev, 0)); 735 release_mem_region(pci_resource_start(pdev, 1), 736 pci_resource_len(pdev, 1)); 737 framebuffer_release(info); 738 } 739 740 /* supported chipsets */ 741 static const struct pci_device_id gxt4500_pci_tbl[] = { 742 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4500P), 743 .driver_data = GXT4500P }, 744 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT6500P), 745 .driver_data = GXT6500P }, 746 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4000P), 747 .driver_data = GXT4000P }, 748 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT6000P), 749 .driver_data = GXT6000P }, 750 { 0 } 751 }; 752 753 MODULE_DEVICE_TABLE(pci, gxt4500_pci_tbl); 754 755 static struct pci_driver gxt4500_driver = { 756 .name = "gxt4500", 757 .id_table = gxt4500_pci_tbl, 758 .probe = gxt4500_probe, 759 .remove = gxt4500_remove, 760 }; 761 762 static int gxt4500_init(void) 763 { 764 #ifndef MODULE 765 if (fb_get_options("gxt4500", &mode_option)) 766 return -ENODEV; 767 #endif 768 769 return pci_register_driver(&gxt4500_driver); 770 } 771 module_init(gxt4500_init); 772 773 static void __exit gxt4500_exit(void) 774 { 775 pci_unregister_driver(&gxt4500_driver); 776 } 777 module_exit(gxt4500_exit); 778 779 MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>"); 780 MODULE_DESCRIPTION("FBDev driver for IBM GXT4500P/6500P and GXT4000P/6000P"); 781 MODULE_LICENSE("GPL"); 782 module_param(mode_option, charp, 0); 783 MODULE_PARM_DESC(mode_option, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\""); 784