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