1 /* 2 * Geode GX framebuffer driver. 3 * 4 * Copyright (C) 2006 Arcom Control Systems Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 * 11 * 12 * This driver assumes that the BIOS has created a virtual PCI device header 13 * for the video device. The PCI header is assumed to contain the following 14 * BARs: 15 * 16 * BAR0 - framebuffer memory 17 * BAR1 - graphics processor registers 18 * BAR2 - display controller registers 19 * BAR3 - video processor and flat panel control registers. 20 * 21 * 16 MiB of framebuffer memory is assumed to be available. 22 */ 23 #include <linux/module.h> 24 #include <linux/kernel.h> 25 #include <linux/errno.h> 26 #include <linux/string.h> 27 #include <linux/mm.h> 28 #include <linux/delay.h> 29 #include <linux/fb.h> 30 #include <linux/console.h> 31 #include <linux/suspend.h> 32 #include <linux/init.h> 33 #include <linux/pci.h> 34 #include <linux/cs5535.h> 35 36 #include "gxfb.h" 37 38 static char *mode_option; 39 static int vram; 40 static int vt_switch; 41 42 /* Modes relevant to the GX (taken from modedb.c) */ 43 static struct fb_videomode gx_modedb[] = { 44 /* 640x480-60 VESA */ 45 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2, 46 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 47 /* 640x480-75 VESA */ 48 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3, 49 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 50 /* 640x480-85 VESA */ 51 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3, 52 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 53 /* 800x600-60 VESA */ 54 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4, 55 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 56 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 57 /* 800x600-75 VESA */ 58 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3, 59 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 60 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 61 /* 800x600-85 VESA */ 62 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3, 63 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 64 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 65 /* 1024x768-60 VESA */ 66 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6, 67 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 68 /* 1024x768-75 VESA */ 69 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3, 70 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 71 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 72 /* 1024x768-85 VESA */ 73 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3, 74 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 75 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 76 /* 1280x960-60 VESA */ 77 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3, 78 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 79 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 80 /* 1280x960-85 VESA */ 81 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3, 82 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 83 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 84 /* 1280x1024-60 VESA */ 85 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3, 86 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 87 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 88 /* 1280x1024-75 VESA */ 89 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3, 90 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 91 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 92 /* 1280x1024-85 VESA */ 93 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3, 94 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 95 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 96 /* 1600x1200-60 VESA */ 97 { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3, 98 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 99 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 100 /* 1600x1200-75 VESA */ 101 { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3, 102 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 103 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 104 /* 1600x1200-85 VESA */ 105 { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3, 106 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 107 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 108 }; 109 110 #ifdef CONFIG_OLPC 111 #include <asm/olpc.h> 112 113 static struct fb_videomode gx_dcon_modedb[] = { 114 /* The only mode the DCON has is 1200x900 */ 115 { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3, 116 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 117 FB_VMODE_NONINTERLACED, 0 } 118 }; 119 120 static void get_modedb(struct fb_videomode **modedb, unsigned int *size) 121 { 122 if (olpc_has_dcon()) { 123 *modedb = (struct fb_videomode *) gx_dcon_modedb; 124 *size = ARRAY_SIZE(gx_dcon_modedb); 125 } else { 126 *modedb = (struct fb_videomode *) gx_modedb; 127 *size = ARRAY_SIZE(gx_modedb); 128 } 129 } 130 131 #else 132 static void get_modedb(struct fb_videomode **modedb, unsigned int *size) 133 { 134 *modedb = (struct fb_videomode *) gx_modedb; 135 *size = ARRAY_SIZE(gx_modedb); 136 } 137 #endif 138 139 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 140 { 141 if (var->xres > 1600 || var->yres > 1200) 142 return -EINVAL; 143 if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16) 144 return -EINVAL; 145 146 if (var->bits_per_pixel == 32) { 147 var->red.offset = 16; var->red.length = 8; 148 var->green.offset = 8; var->green.length = 8; 149 var->blue.offset = 0; var->blue.length = 8; 150 } else if (var->bits_per_pixel == 16) { 151 var->red.offset = 11; var->red.length = 5; 152 var->green.offset = 5; var->green.length = 6; 153 var->blue.offset = 0; var->blue.length = 5; 154 } else if (var->bits_per_pixel == 8) { 155 var->red.offset = 0; var->red.length = 8; 156 var->green.offset = 0; var->green.length = 8; 157 var->blue.offset = 0; var->blue.length = 8; 158 } else 159 return -EINVAL; 160 var->transp.offset = 0; var->transp.length = 0; 161 162 /* Enough video memory? */ 163 if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len) 164 return -EINVAL; 165 166 /* FIXME: Check timing parameters here? */ 167 168 return 0; 169 } 170 171 static int gxfb_set_par(struct fb_info *info) 172 { 173 if (info->var.bits_per_pixel > 8) 174 info->fix.visual = FB_VISUAL_TRUECOLOR; 175 else 176 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 177 178 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel); 179 180 gx_set_mode(info); 181 182 return 0; 183 } 184 185 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 186 { 187 chan &= 0xffff; 188 chan >>= 16 - bf->length; 189 return chan << bf->offset; 190 } 191 192 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green, 193 unsigned blue, unsigned transp, 194 struct fb_info *info) 195 { 196 if (info->var.grayscale) { 197 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 198 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; 199 } 200 201 /* Truecolor has hardware independent palette */ 202 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 203 u32 *pal = info->pseudo_palette; 204 u32 v; 205 206 if (regno >= 16) 207 return -EINVAL; 208 209 v = chan_to_field(red, &info->var.red); 210 v |= chan_to_field(green, &info->var.green); 211 v |= chan_to_field(blue, &info->var.blue); 212 213 pal[regno] = v; 214 } else { 215 if (regno >= 256) 216 return -EINVAL; 217 218 gx_set_hw_palette_reg(info, regno, red, green, blue); 219 } 220 221 return 0; 222 } 223 224 static int gxfb_blank(int blank_mode, struct fb_info *info) 225 { 226 return gx_blank_display(info, blank_mode); 227 } 228 229 static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev) 230 { 231 struct gxfb_par *par = info->par; 232 int ret; 233 234 ret = pci_enable_device(dev); 235 if (ret < 0) 236 return ret; 237 238 ret = pci_request_region(dev, 3, "gxfb (video processor)"); 239 if (ret < 0) 240 return ret; 241 par->vid_regs = pci_ioremap_bar(dev, 3); 242 if (!par->vid_regs) 243 return -ENOMEM; 244 245 ret = pci_request_region(dev, 2, "gxfb (display controller)"); 246 if (ret < 0) 247 return ret; 248 par->dc_regs = pci_ioremap_bar(dev, 2); 249 if (!par->dc_regs) 250 return -ENOMEM; 251 252 ret = pci_request_region(dev, 1, "gxfb (graphics processor)"); 253 if (ret < 0) 254 return ret; 255 par->gp_regs = pci_ioremap_bar(dev, 1); 256 257 if (!par->gp_regs) 258 return -ENOMEM; 259 260 ret = pci_request_region(dev, 0, "gxfb (framebuffer)"); 261 if (ret < 0) 262 return ret; 263 264 info->fix.smem_start = pci_resource_start(dev, 0); 265 info->fix.smem_len = vram ? vram : gx_frame_buffer_size(); 266 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); 267 if (!info->screen_base) 268 return -ENOMEM; 269 270 /* Set the 16MiB aligned base address of the graphics memory region 271 * in the display controller */ 272 273 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000); 274 275 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n", 276 info->fix.smem_len / 1024, info->fix.smem_start); 277 278 return 0; 279 } 280 281 static struct fb_ops gxfb_ops = { 282 .owner = THIS_MODULE, 283 .fb_check_var = gxfb_check_var, 284 .fb_set_par = gxfb_set_par, 285 .fb_setcolreg = gxfb_setcolreg, 286 .fb_blank = gxfb_blank, 287 /* No HW acceleration for now. */ 288 .fb_fillrect = cfb_fillrect, 289 .fb_copyarea = cfb_copyarea, 290 .fb_imageblit = cfb_imageblit, 291 }; 292 293 static struct fb_info *gxfb_init_fbinfo(struct device *dev) 294 { 295 struct gxfb_par *par; 296 struct fb_info *info; 297 298 /* Alloc enough space for the pseudo palette. */ 299 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16, 300 dev); 301 if (!info) 302 return NULL; 303 304 par = info->par; 305 306 strcpy(info->fix.id, "Geode GX"); 307 308 info->fix.type = FB_TYPE_PACKED_PIXELS; 309 info->fix.type_aux = 0; 310 info->fix.xpanstep = 0; 311 info->fix.ypanstep = 0; 312 info->fix.ywrapstep = 0; 313 info->fix.accel = FB_ACCEL_NONE; 314 315 info->var.nonstd = 0; 316 info->var.activate = FB_ACTIVATE_NOW; 317 info->var.height = -1; 318 info->var.width = -1; 319 info->var.accel_flags = 0; 320 info->var.vmode = FB_VMODE_NONINTERLACED; 321 322 info->fbops = &gxfb_ops; 323 info->flags = FBINFO_DEFAULT; 324 info->node = -1; 325 326 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par); 327 328 info->var.grayscale = 0; 329 330 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 331 framebuffer_release(info); 332 return NULL; 333 } 334 335 return info; 336 } 337 338 #ifdef CONFIG_PM 339 static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state) 340 { 341 struct fb_info *info = pci_get_drvdata(pdev); 342 343 if (state.event == PM_EVENT_SUSPEND) { 344 console_lock(); 345 gx_powerdown(info); 346 fb_set_suspend(info, 1); 347 console_unlock(); 348 } 349 350 /* there's no point in setting PCI states; we emulate PCI, so 351 * we don't end up getting power savings anyways */ 352 353 return 0; 354 } 355 356 static int gxfb_resume(struct pci_dev *pdev) 357 { 358 struct fb_info *info = pci_get_drvdata(pdev); 359 int ret; 360 361 console_lock(); 362 ret = gx_powerup(info); 363 if (ret) { 364 printk(KERN_ERR "gxfb: power up failed!\n"); 365 return ret; 366 } 367 368 fb_set_suspend(info, 0); 369 console_unlock(); 370 return 0; 371 } 372 #endif 373 374 static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id) 375 { 376 struct gxfb_par *par; 377 struct fb_info *info; 378 int ret; 379 unsigned long val; 380 381 struct fb_videomode *modedb_ptr; 382 unsigned int modedb_size; 383 384 info = gxfb_init_fbinfo(&pdev->dev); 385 if (!info) 386 return -ENOMEM; 387 par = info->par; 388 389 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) { 390 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n"); 391 goto err; 392 } 393 394 /* Figure out if this is a TFT or CRT part */ 395 396 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val); 397 398 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP) 399 par->enable_crt = 0; 400 else 401 par->enable_crt = 1; 402 403 get_modedb(&modedb_ptr, &modedb_size); 404 ret = fb_find_mode(&info->var, info, mode_option, 405 modedb_ptr, modedb_size, NULL, 16); 406 if (ret == 0 || ret == 4) { 407 dev_err(&pdev->dev, "could not find valid video mode\n"); 408 ret = -EINVAL; 409 goto err; 410 } 411 412 413 /* Clear the frame buffer of garbage. */ 414 memset_io(info->screen_base, 0, info->fix.smem_len); 415 416 gxfb_check_var(&info->var, info); 417 gxfb_set_par(info); 418 419 pm_set_vt_switch(vt_switch); 420 421 if (register_framebuffer(info) < 0) { 422 ret = -EINVAL; 423 goto err; 424 } 425 pci_set_drvdata(pdev, info); 426 fb_info(info, "%s frame buffer device\n", info->fix.id); 427 return 0; 428 429 err: 430 if (info->screen_base) { 431 iounmap(info->screen_base); 432 pci_release_region(pdev, 0); 433 } 434 if (par->vid_regs) { 435 iounmap(par->vid_regs); 436 pci_release_region(pdev, 3); 437 } 438 if (par->dc_regs) { 439 iounmap(par->dc_regs); 440 pci_release_region(pdev, 2); 441 } 442 if (par->gp_regs) { 443 iounmap(par->gp_regs); 444 pci_release_region(pdev, 1); 445 } 446 447 fb_dealloc_cmap(&info->cmap); 448 framebuffer_release(info); 449 return ret; 450 } 451 452 static void gxfb_remove(struct pci_dev *pdev) 453 { 454 struct fb_info *info = pci_get_drvdata(pdev); 455 struct gxfb_par *par = info->par; 456 457 unregister_framebuffer(info); 458 459 iounmap((void __iomem *)info->screen_base); 460 pci_release_region(pdev, 0); 461 462 iounmap(par->vid_regs); 463 pci_release_region(pdev, 3); 464 465 iounmap(par->dc_regs); 466 pci_release_region(pdev, 2); 467 468 iounmap(par->gp_regs); 469 pci_release_region(pdev, 1); 470 471 fb_dealloc_cmap(&info->cmap); 472 473 framebuffer_release(info); 474 } 475 476 static struct pci_device_id gxfb_id_table[] = { 477 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) }, 478 { 0, } 479 }; 480 481 MODULE_DEVICE_TABLE(pci, gxfb_id_table); 482 483 static struct pci_driver gxfb_driver = { 484 .name = "gxfb", 485 .id_table = gxfb_id_table, 486 .probe = gxfb_probe, 487 .remove = gxfb_remove, 488 #ifdef CONFIG_PM 489 .suspend = gxfb_suspend, 490 .resume = gxfb_resume, 491 #endif 492 }; 493 494 #ifndef MODULE 495 static int __init gxfb_setup(char *options) 496 { 497 498 char *opt; 499 500 if (!options || !*options) 501 return 0; 502 503 while ((opt = strsep(&options, ",")) != NULL) { 504 if (!*opt) 505 continue; 506 507 mode_option = opt; 508 } 509 510 return 0; 511 } 512 #endif 513 514 static int __init gxfb_init(void) 515 { 516 #ifndef MODULE 517 char *option = NULL; 518 519 if (fb_get_options("gxfb", &option)) 520 return -ENODEV; 521 522 gxfb_setup(option); 523 #endif 524 return pci_register_driver(&gxfb_driver); 525 } 526 527 static void __exit gxfb_cleanup(void) 528 { 529 pci_unregister_driver(&gxfb_driver); 530 } 531 532 module_init(gxfb_init); 533 module_exit(gxfb_cleanup); 534 535 module_param(mode_option, charp, 0); 536 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])"); 537 538 module_param(vram, int, 0); 539 MODULE_PARM_DESC(vram, "video memory size"); 540 541 module_param(vt_switch, int, 0); 542 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume"); 543 544 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX"); 545 MODULE_LICENSE("GPL"); 546