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