1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Geode GX framebuffer driver. 4 * 5 * Copyright (C) 2006 Arcom Control Systems Ltd. 6 * 7 * This driver assumes that the BIOS has created a virtual PCI device header 8 * for the video device. The PCI header is assumed to contain the following 9 * BARs: 10 * 11 * BAR0 - framebuffer memory 12 * BAR1 - graphics processor registers 13 * BAR2 - display controller registers 14 * BAR3 - video processor and flat panel control registers. 15 * 16 * 16 MiB of framebuffer memory is assumed to be available. 17 */ 18 #include <linux/aperture.h> 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/errno.h> 22 #include <linux/string.h> 23 #include <linux/mm.h> 24 #include <linux/delay.h> 25 #include <linux/fb.h> 26 #include <linux/console.h> 27 #include <linux/suspend.h> 28 #include <linux/init.h> 29 #include <linux/pci.h> 30 #include <linux/cs5535.h> 31 32 #include <asm/olpc.h> 33 34 #include "gxfb.h" 35 36 static char *mode_option; 37 static int vram; 38 static int vt_switch; 39 40 /* Modes relevant to the GX (taken from modedb.c) */ 41 static struct fb_videomode gx_modedb[] = { 42 /* 640x480-60 VESA */ 43 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2, 44 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 45 /* 640x480-75 VESA */ 46 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3, 47 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 48 /* 640x480-85 VESA */ 49 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3, 50 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 51 /* 800x600-60 VESA */ 52 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4, 53 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 54 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 55 /* 800x600-75 VESA */ 56 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3, 57 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 58 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 59 /* 800x600-85 VESA */ 60 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3, 61 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 62 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 63 /* 1024x768-60 VESA */ 64 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6, 65 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 66 /* 1024x768-75 VESA */ 67 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3, 68 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 69 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 70 /* 1024x768-85 VESA */ 71 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3, 72 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 73 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 74 /* 1280x960-60 VESA */ 75 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3, 76 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 77 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 78 /* 1280x960-85 VESA */ 79 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3, 80 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 81 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 82 /* 1280x1024-60 VESA */ 83 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3, 84 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 85 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 86 /* 1280x1024-75 VESA */ 87 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3, 88 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 89 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 90 /* 1280x1024-85 VESA */ 91 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3, 92 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 93 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 94 /* 1600x1200-60 VESA */ 95 { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3, 96 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 97 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 98 /* 1600x1200-75 VESA */ 99 { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3, 100 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 101 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 102 /* 1600x1200-85 VESA */ 103 { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3, 104 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 105 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, 106 }; 107 108 static struct fb_videomode gx_dcon_modedb[] = { 109 /* The only mode the DCON has is 1200x900 */ 110 { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3, 111 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, 112 FB_VMODE_NONINTERLACED, 0 } 113 }; 114 115 static void get_modedb(struct fb_videomode **modedb, unsigned int *size) 116 { 117 if (olpc_has_dcon()) { 118 *modedb = (struct fb_videomode *) gx_dcon_modedb; 119 *size = ARRAY_SIZE(gx_dcon_modedb); 120 } else { 121 *modedb = (struct fb_videomode *) gx_modedb; 122 *size = ARRAY_SIZE(gx_modedb); 123 } 124 } 125 126 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 127 { 128 if (var->xres > 1600 || var->yres > 1200) 129 return -EINVAL; 130 if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16) 131 return -EINVAL; 132 133 if (var->bits_per_pixel == 32) { 134 var->red.offset = 16; var->red.length = 8; 135 var->green.offset = 8; var->green.length = 8; 136 var->blue.offset = 0; var->blue.length = 8; 137 } else if (var->bits_per_pixel == 16) { 138 var->red.offset = 11; var->red.length = 5; 139 var->green.offset = 5; var->green.length = 6; 140 var->blue.offset = 0; var->blue.length = 5; 141 } else if (var->bits_per_pixel == 8) { 142 var->red.offset = 0; var->red.length = 8; 143 var->green.offset = 0; var->green.length = 8; 144 var->blue.offset = 0; var->blue.length = 8; 145 } else 146 return -EINVAL; 147 var->transp.offset = 0; var->transp.length = 0; 148 149 /* Enough video memory? */ 150 if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len) 151 return -EINVAL; 152 153 /* FIXME: Check timing parameters here? */ 154 155 return 0; 156 } 157 158 static int gxfb_set_par(struct fb_info *info) 159 { 160 if (info->var.bits_per_pixel > 8) 161 info->fix.visual = FB_VISUAL_TRUECOLOR; 162 else 163 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 164 165 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel); 166 167 gx_set_mode(info); 168 169 return 0; 170 } 171 172 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 173 { 174 chan &= 0xffff; 175 chan >>= 16 - bf->length; 176 return chan << bf->offset; 177 } 178 179 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green, 180 unsigned blue, unsigned transp, 181 struct fb_info *info) 182 { 183 if (info->var.grayscale) { 184 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 185 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; 186 } 187 188 /* Truecolor has hardware independent palette */ 189 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 190 u32 *pal = info->pseudo_palette; 191 u32 v; 192 193 if (regno >= 16) 194 return -EINVAL; 195 196 v = chan_to_field(red, &info->var.red); 197 v |= chan_to_field(green, &info->var.green); 198 v |= chan_to_field(blue, &info->var.blue); 199 200 pal[regno] = v; 201 } else { 202 if (regno >= 256) 203 return -EINVAL; 204 205 gx_set_hw_palette_reg(info, regno, red, green, blue); 206 } 207 208 return 0; 209 } 210 211 static int gxfb_blank(int blank_mode, struct fb_info *info) 212 { 213 return gx_blank_display(info, blank_mode); 214 } 215 216 static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev) 217 { 218 struct gxfb_par *par = info->par; 219 int ret; 220 221 ret = pci_enable_device(dev); 222 if (ret < 0) 223 return ret; 224 225 ret = pci_request_region(dev, 3, "gxfb (video processor)"); 226 if (ret < 0) 227 return ret; 228 par->vid_regs = pci_ioremap_bar(dev, 3); 229 if (!par->vid_regs) 230 return -ENOMEM; 231 232 ret = pci_request_region(dev, 2, "gxfb (display controller)"); 233 if (ret < 0) 234 return ret; 235 par->dc_regs = pci_ioremap_bar(dev, 2); 236 if (!par->dc_regs) 237 return -ENOMEM; 238 239 ret = pci_request_region(dev, 1, "gxfb (graphics processor)"); 240 if (ret < 0) 241 return ret; 242 par->gp_regs = pci_ioremap_bar(dev, 1); 243 244 if (!par->gp_regs) 245 return -ENOMEM; 246 247 ret = pci_request_region(dev, 0, "gxfb (framebuffer)"); 248 if (ret < 0) 249 return ret; 250 251 info->fix.smem_start = pci_resource_start(dev, 0); 252 info->fix.smem_len = vram ? vram : gx_frame_buffer_size(); 253 info->screen_base = ioremap_wc(info->fix.smem_start, 254 info->fix.smem_len); 255 if (!info->screen_base) 256 return -ENOMEM; 257 258 /* Set the 16MiB aligned base address of the graphics memory region 259 * in the display controller */ 260 261 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000); 262 263 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n", 264 info->fix.smem_len / 1024, info->fix.smem_start); 265 266 return 0; 267 } 268 269 static const struct fb_ops gxfb_ops = { 270 .owner = THIS_MODULE, 271 .fb_check_var = gxfb_check_var, 272 .fb_set_par = gxfb_set_par, 273 .fb_setcolreg = gxfb_setcolreg, 274 .fb_blank = gxfb_blank, 275 /* No HW acceleration for now. */ 276 .fb_fillrect = cfb_fillrect, 277 .fb_copyarea = cfb_copyarea, 278 .fb_imageblit = cfb_imageblit, 279 }; 280 281 static struct fb_info *gxfb_init_fbinfo(struct device *dev) 282 { 283 struct gxfb_par *par; 284 struct fb_info *info; 285 286 /* Alloc enough space for the pseudo palette. */ 287 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16, 288 dev); 289 if (!info) 290 return NULL; 291 292 par = info->par; 293 294 strcpy(info->fix.id, "Geode GX"); 295 296 info->fix.type = FB_TYPE_PACKED_PIXELS; 297 info->fix.type_aux = 0; 298 info->fix.xpanstep = 0; 299 info->fix.ypanstep = 0; 300 info->fix.ywrapstep = 0; 301 info->fix.accel = FB_ACCEL_NONE; 302 303 info->var.nonstd = 0; 304 info->var.activate = FB_ACTIVATE_NOW; 305 info->var.height = -1; 306 info->var.width = -1; 307 info->var.accel_flags = 0; 308 info->var.vmode = FB_VMODE_NONINTERLACED; 309 310 info->fbops = &gxfb_ops; 311 info->flags = FBINFO_DEFAULT; 312 info->node = -1; 313 314 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par); 315 316 info->var.grayscale = 0; 317 318 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 319 framebuffer_release(info); 320 return NULL; 321 } 322 323 return info; 324 } 325 326 static int __maybe_unused gxfb_suspend(struct device *dev) 327 { 328 struct fb_info *info = dev_get_drvdata(dev); 329 330 console_lock(); 331 gx_powerdown(info); 332 fb_set_suspend(info, 1); 333 console_unlock(); 334 335 /* there's no point in setting PCI states; we emulate PCI, so 336 * we don't end up getting power savings anyways */ 337 338 return 0; 339 } 340 341 static int __maybe_unused gxfb_resume(struct device *dev) 342 { 343 struct fb_info *info = dev_get_drvdata(dev); 344 int ret; 345 346 console_lock(); 347 ret = gx_powerup(info); 348 if (ret) { 349 printk(KERN_ERR "gxfb: power up failed!\n"); 350 return ret; 351 } 352 353 fb_set_suspend(info, 0); 354 console_unlock(); 355 return 0; 356 } 357 358 static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id) 359 { 360 struct gxfb_par *par; 361 struct fb_info *info; 362 int ret; 363 unsigned long val; 364 365 struct fb_videomode *modedb_ptr; 366 unsigned int modedb_size; 367 368 ret = aperture_remove_conflicting_pci_devices(pdev, "gxfb"); 369 if (ret) 370 return ret; 371 372 info = gxfb_init_fbinfo(&pdev->dev); 373 if (!info) 374 return -ENOMEM; 375 par = info->par; 376 377 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) { 378 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n"); 379 goto err; 380 } 381 382 /* Figure out if this is a TFT or CRT part */ 383 384 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val); 385 386 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP) 387 par->enable_crt = 0; 388 else 389 par->enable_crt = 1; 390 391 get_modedb(&modedb_ptr, &modedb_size); 392 ret = fb_find_mode(&info->var, info, mode_option, 393 modedb_ptr, modedb_size, NULL, 16); 394 if (ret == 0 || ret == 4) { 395 dev_err(&pdev->dev, "could not find valid video mode\n"); 396 ret = -EINVAL; 397 goto err; 398 } 399 400 401 /* Clear the frame buffer of garbage. */ 402 memset_io(info->screen_base, 0, info->fix.smem_len); 403 404 gxfb_check_var(&info->var, info); 405 gxfb_set_par(info); 406 407 pm_set_vt_switch(vt_switch); 408 409 if (register_framebuffer(info) < 0) { 410 ret = -EINVAL; 411 goto err; 412 } 413 pci_set_drvdata(pdev, info); 414 fb_info(info, "%s frame buffer device\n", info->fix.id); 415 return 0; 416 417 err: 418 if (info->screen_base) { 419 iounmap(info->screen_base); 420 pci_release_region(pdev, 0); 421 } 422 if (par->vid_regs) { 423 iounmap(par->vid_regs); 424 pci_release_region(pdev, 3); 425 } 426 if (par->dc_regs) { 427 iounmap(par->dc_regs); 428 pci_release_region(pdev, 2); 429 } 430 if (par->gp_regs) { 431 iounmap(par->gp_regs); 432 pci_release_region(pdev, 1); 433 } 434 435 fb_dealloc_cmap(&info->cmap); 436 framebuffer_release(info); 437 return ret; 438 } 439 440 static void gxfb_remove(struct pci_dev *pdev) 441 { 442 struct fb_info *info = pci_get_drvdata(pdev); 443 struct gxfb_par *par = info->par; 444 445 unregister_framebuffer(info); 446 447 iounmap((void __iomem *)info->screen_base); 448 pci_release_region(pdev, 0); 449 450 iounmap(par->vid_regs); 451 pci_release_region(pdev, 3); 452 453 iounmap(par->dc_regs); 454 pci_release_region(pdev, 2); 455 456 iounmap(par->gp_regs); 457 pci_release_region(pdev, 1); 458 459 fb_dealloc_cmap(&info->cmap); 460 461 framebuffer_release(info); 462 } 463 464 static const struct pci_device_id gxfb_id_table[] = { 465 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) }, 466 { 0, } 467 }; 468 469 MODULE_DEVICE_TABLE(pci, gxfb_id_table); 470 471 static const struct dev_pm_ops gxfb_pm_ops = { 472 #ifdef CONFIG_PM_SLEEP 473 .suspend = gxfb_suspend, 474 .resume = gxfb_resume, 475 .freeze = NULL, 476 .thaw = gxfb_resume, 477 .poweroff = NULL, 478 .restore = gxfb_resume, 479 #endif 480 }; 481 482 static struct pci_driver gxfb_driver = { 483 .name = "gxfb", 484 .id_table = gxfb_id_table, 485 .probe = gxfb_probe, 486 .remove = gxfb_remove, 487 .driver.pm = &gxfb_pm_ops, 488 }; 489 490 #ifndef MODULE 491 static int __init gxfb_setup(char *options) 492 { 493 494 char *opt; 495 496 if (!options || !*options) 497 return 0; 498 499 while ((opt = strsep(&options, ",")) != NULL) { 500 if (!*opt) 501 continue; 502 503 mode_option = opt; 504 } 505 506 return 0; 507 } 508 #endif 509 510 static int __init gxfb_init(void) 511 { 512 #ifndef MODULE 513 char *option = NULL; 514 #endif 515 516 if (fb_modesetting_disabled("gxfb")) 517 return -ENODEV; 518 519 #ifndef MODULE 520 if (fb_get_options("gxfb", &option)) 521 return -ENODEV; 522 523 gxfb_setup(option); 524 #endif 525 return pci_register_driver(&gxfb_driver); 526 } 527 528 static void __exit gxfb_cleanup(void) 529 { 530 pci_unregister_driver(&gxfb_driver); 531 } 532 533 module_init(gxfb_init); 534 module_exit(gxfb_cleanup); 535 536 module_param(mode_option, charp, 0); 537 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])"); 538 539 module_param(vram, int, 0); 540 MODULE_PARM_DESC(vram, "video memory size"); 541 542 module_param(vt_switch, int, 0); 543 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume"); 544 545 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX"); 546 MODULE_LICENSE("GPL"); 547