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 38static char *mode_option; 39static int vram; 40static int vt_switch; 41 42/* Modes relevant to the GX (taken from modedb.c) */ 43static struct fb_videomode gx_modedb[] __devinitdata = { 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 113static struct fb_videomode gx_dcon_modedb[] __devinitdata = { 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 120static void __devinit get_modedb(struct fb_videomode **modedb, 121 unsigned int *size) 122{ 123 if (olpc_has_dcon()) { 124 *modedb = (struct fb_videomode *) gx_dcon_modedb; 125 *size = ARRAY_SIZE(gx_dcon_modedb); 126 } else { 127 *modedb = (struct fb_videomode *) gx_modedb; 128 *size = ARRAY_SIZE(gx_modedb); 129 } 130} 131 132#else 133static void __devinit get_modedb(struct fb_videomode **modedb, 134 unsigned int *size) 135{ 136 *modedb = (struct fb_videomode *) gx_modedb; 137 *size = ARRAY_SIZE(gx_modedb); 138} 139#endif 140 141static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 142{ 143 if (var->xres > 1600 || var->yres > 1200) 144 return -EINVAL; 145 if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16) 146 return -EINVAL; 147 148 if (var->bits_per_pixel == 32) { 149 var->red.offset = 16; var->red.length = 8; 150 var->green.offset = 8; var->green.length = 8; 151 var->blue.offset = 0; var->blue.length = 8; 152 } else if (var->bits_per_pixel == 16) { 153 var->red.offset = 11; var->red.length = 5; 154 var->green.offset = 5; var->green.length = 6; 155 var->blue.offset = 0; var->blue.length = 5; 156 } else if (var->bits_per_pixel == 8) { 157 var->red.offset = 0; var->red.length = 8; 158 var->green.offset = 0; var->green.length = 8; 159 var->blue.offset = 0; var->blue.length = 8; 160 } else 161 return -EINVAL; 162 var->transp.offset = 0; var->transp.length = 0; 163 164 /* Enough video memory? */ 165 if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len) 166 return -EINVAL; 167 168 169 return 0; 170} 171 172static int gxfb_set_par(struct fb_info *info) 173{ 174 if (info->var.bits_per_pixel > 8) 175 info->fix.visual = FB_VISUAL_TRUECOLOR; 176 else 177 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 178 179 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel); 180 181 gx_set_mode(info); 182 183 return 0; 184} 185 186static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 187{ 188 chan &= 0xffff; 189 chan >>= 16 - bf->length; 190 return chan << bf->offset; 191} 192 193static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green, 194 unsigned blue, unsigned transp, 195 struct fb_info *info) 196{ 197 if (info->var.grayscale) { 198 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 199 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; 200 } 201 202 /* Truecolor has hardware independent palette */ 203 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 204 u32 *pal = info->pseudo_palette; 205 u32 v; 206 207 if (regno >= 16) 208 return -EINVAL; 209 210 v = chan_to_field(red, &info->var.red); 211 v |= chan_to_field(green, &info->var.green); 212 v |= chan_to_field(blue, &info->var.blue); 213 214 pal[regno] = v; 215 } else { 216 if (regno >= 256) 217 return -EINVAL; 218 219 gx_set_hw_palette_reg(info, regno, red, green, blue); 220 } 221 222 return 0; 223} 224 225static int gxfb_blank(int blank_mode, struct fb_info *info) 226{ 227 return gx_blank_display(info, blank_mode); 228} 229 230static int __devinit gxfb_map_video_memory(struct fb_info *info, 231 struct pci_dev *dev) 232{ 233 struct gxfb_par *par = info->par; 234 int ret; 235 236 ret = pci_enable_device(dev); 237 if (ret < 0) 238 return ret; 239 240 ret = pci_request_region(dev, 3, "gxfb (video processor)"); 241 if (ret < 0) 242 return ret; 243 par->vid_regs = pci_ioremap_bar(dev, 3); 244 if (!par->vid_regs) 245 return -ENOMEM; 246 247 ret = pci_request_region(dev, 2, "gxfb (display controller)"); 248 if (ret < 0) 249 return ret; 250 par->dc_regs = pci_ioremap_bar(dev, 2); 251 if (!par->dc_regs) 252 return -ENOMEM; 253 254 ret = pci_request_region(dev, 1, "gxfb (graphics processor)"); 255 if (ret < 0) 256 return ret; 257 par->gp_regs = pci_ioremap_bar(dev, 1); 258 259 if (!par->gp_regs) 260 return -ENOMEM; 261 262 ret = pci_request_region(dev, 0, "gxfb (framebuffer)"); 263 if (ret < 0) 264 return ret; 265 266 info->fix.smem_start = pci_resource_start(dev, 0); 267 info->fix.smem_len = vram ? vram : gx_frame_buffer_size(); 268 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); 269 if (!info->screen_base) 270 return -ENOMEM; 271 272 /* Set the 16MiB aligned base address of the graphics memory region 273 * in the display controller */ 274 275 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000); 276 277 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n", 278 info->fix.smem_len / 1024, info->fix.smem_start); 279 280 return 0; 281} 282 283static struct fb_ops gxfb_ops = { 284 .owner = THIS_MODULE, 285 .fb_check_var = gxfb_check_var, 286 .fb_set_par = gxfb_set_par, 287 .fb_setcolreg = gxfb_setcolreg, 288 .fb_blank = gxfb_blank, 289 /* No HW acceleration for now. */ 290 .fb_fillrect = cfb_fillrect, 291 .fb_copyarea = cfb_copyarea, 292 .fb_imageblit = cfb_imageblit, 293}; 294 295static struct fb_info *__devinit gxfb_init_fbinfo(struct device *dev) 296{ 297 struct gxfb_par *par; 298 struct fb_info *info; 299 300 /* Alloc enough space for the pseudo palette. */ 301 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16, 302 dev); 303 if (!info) 304 return NULL; 305 306 par = info->par; 307 308 strcpy(info->fix.id, "Geode GX"); 309 310 info->fix.type = FB_TYPE_PACKED_PIXELS; 311 info->fix.type_aux = 0; 312 info->fix.xpanstep = 0; 313 info->fix.ypanstep = 0; 314 info->fix.ywrapstep = 0; 315 info->fix.accel = FB_ACCEL_NONE; 316 317 info->var.nonstd = 0; 318 info->var.activate = FB_ACTIVATE_NOW; 319 info->var.height = -1; 320 info->var.width = -1; 321 info->var.accel_flags = 0; 322 info->var.vmode = FB_VMODE_NONINTERLACED; 323 324 info->fbops = &gxfb_ops; 325 info->flags = FBINFO_DEFAULT; 326 info->node = -1; 327 328 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par); 329 330 info->var.grayscale = 0; 331 332 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 333 framebuffer_release(info); 334 return NULL; 335 } 336 337 return info; 338} 339 340#ifdef CONFIG_PM 341static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state) 342{ 343 struct fb_info *info = pci_get_drvdata(pdev); 344 345 if (state.event == PM_EVENT_SUSPEND) { 346 acquire_console_sem(); 347 gx_powerdown(info); 348 fb_set_suspend(info, 1); 349 release_console_sem(); 350 } 351 352 /* there's no point in setting PCI states; we emulate PCI, so 353 * we don't end up getting power savings anyways */ 354 355 return 0; 356} 357 358static int gxfb_resume(struct pci_dev *pdev) 359{ 360 struct fb_info *info = pci_get_drvdata(pdev); 361 int ret; 362 363 acquire_console_sem(); 364 ret = gx_powerup(info); 365 if (ret) { 366 printk(KERN_ERR "gxfb: power up failed!\n"); 367 return ret; 368 } 369 370 fb_set_suspend(info, 0); 371 release_console_sem(); 372 return 0; 373} 374#endif 375 376static int __devinit gxfb_probe(struct pci_dev *pdev, 377 const struct pci_device_id *id) 378{ 379 struct gxfb_par *par; 380 struct fb_info *info; 381 int ret; 382 unsigned long val; 383 384 struct fb_videomode *modedb_ptr; 385 unsigned int modedb_size; 386 387 info = gxfb_init_fbinfo(&pdev->dev); 388 if (!info) 389 return -ENOMEM; 390 par = info->par; 391 392 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) { 393 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n"); 394 goto err; 395 } 396 397 /* Figure out if this is a TFT or CRT part */ 398 399 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val); 400 401 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP) 402 par->enable_crt = 0; 403 else 404 par->enable_crt = 1; 405 406 get_modedb(&modedb_ptr, &modedb_size); 407 ret = fb_find_mode(&info->var, info, mode_option, 408 modedb_ptr, modedb_size, NULL, 16); 409 if (ret == 0 || ret == 4) { 410 dev_err(&pdev->dev, "could not find valid video mode\n"); 411 ret = -EINVAL; 412 goto err; 413 } 414 415 416 /* Clear the frame buffer of garbage. */ 417 memset_io(info->screen_base, 0, info->fix.smem_len); 418 419 gxfb_check_var(&info->var, info); 420 gxfb_set_par(info); 421 422 pm_set_vt_switch(vt_switch); 423 424 if (register_framebuffer(info) < 0) { 425 ret = -EINVAL; 426 goto err; 427 } 428 pci_set_drvdata(pdev, info); 429 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id); 430 return 0; 431 432 err: 433 if (info->screen_base) { 434 iounmap(info->screen_base); 435 pci_release_region(pdev, 0); 436 } 437 if (par->vid_regs) { 438 iounmap(par->vid_regs); 439 pci_release_region(pdev, 3); 440 } 441 if (par->dc_regs) { 442 iounmap(par->dc_regs); 443 pci_release_region(pdev, 2); 444 } 445 if (par->gp_regs) { 446 iounmap(par->gp_regs); 447 pci_release_region(pdev, 1); 448 } 449 450 if (info) { 451 fb_dealloc_cmap(&info->cmap); 452 framebuffer_release(info); 453 } 454 return ret; 455} 456 457static void __devexit gxfb_remove(struct pci_dev *pdev) 458{ 459 struct fb_info *info = pci_get_drvdata(pdev); 460 struct gxfb_par *par = info->par; 461 462 unregister_framebuffer(info); 463 464 iounmap((void __iomem *)info->screen_base); 465 pci_release_region(pdev, 0); 466 467 iounmap(par->vid_regs); 468 pci_release_region(pdev, 3); 469 470 iounmap(par->dc_regs); 471 pci_release_region(pdev, 2); 472 473 iounmap(par->gp_regs); 474 pci_release_region(pdev, 1); 475 476 fb_dealloc_cmap(&info->cmap); 477 pci_set_drvdata(pdev, NULL); 478 479 framebuffer_release(info); 480} 481 482static struct pci_device_id gxfb_id_table[] = { 483 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) }, 484 { 0, } 485}; 486 487MODULE_DEVICE_TABLE(pci, gxfb_id_table); 488 489static struct pci_driver gxfb_driver = { 490 .name = "gxfb", 491 .id_table = gxfb_id_table, 492 .probe = gxfb_probe, 493 .remove = gxfb_remove, 494#ifdef CONFIG_PM 495 .suspend = gxfb_suspend, 496 .resume = gxfb_resume, 497#endif 498}; 499 500#ifndef MODULE 501static int __init gxfb_setup(char *options) 502{ 503 504 char *opt; 505 506 if (!options || !*options) 507 return 0; 508 509 while ((opt = strsep(&options, ",")) != NULL) { 510 if (!*opt) 511 continue; 512 513 mode_option = opt; 514 } 515 516 return 0; 517} 518#endif 519 520static int __init gxfb_init(void) 521{ 522#ifndef MODULE 523 char *option = NULL; 524 525 if (fb_get_options("gxfb", &option)) 526 return -ENODEV; 527 528 gxfb_setup(option); 529#endif 530 return pci_register_driver(&gxfb_driver); 531} 532 533static void __exit gxfb_cleanup(void) 534{ 535 pci_unregister_driver(&gxfb_driver); 536} 537 538module_init(gxfb_init); 539module_exit(gxfb_cleanup); 540 541module_param(mode_option, charp, 0); 542MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])"); 543 544module_param(vram, int, 0); 545MODULE_PARM_DESC(vram, "video memory size"); 546 547module_param(vt_switch, int, 0); 548MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume"); 549 550MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX"); 551MODULE_LICENSE("GPL"); 552