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 /* FIXME: Check timing parameters here? */ 169 170 return 0; 171} 172 173static int gxfb_set_par(struct fb_info *info) 174{ 175 if (info->var.bits_per_pixel > 8) 176 info->fix.visual = FB_VISUAL_TRUECOLOR; 177 else 178 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 179 180 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel); 181 182 gx_set_mode(info); 183 184 return 0; 185} 186 187static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 188{ 189 chan &= 0xffff; 190 chan >>= 16 - bf->length; 191 return chan << bf->offset; 192} 193 194static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green, 195 unsigned blue, unsigned transp, 196 struct fb_info *info) 197{ 198 if (info->var.grayscale) { 199 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 200 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; 201 } 202 203 /* Truecolor has hardware independent palette */ 204 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 205 u32 *pal = info->pseudo_palette; 206 u32 v; 207 208 if (regno >= 16) 209 return -EINVAL; 210 211 v = chan_to_field(red, &info->var.red); 212 v |= chan_to_field(green, &info->var.green); 213 v |= chan_to_field(blue, &info->var.blue); 214 215 pal[regno] = v; 216 } else { 217 if (regno >= 256) 218 return -EINVAL; 219 220 gx_set_hw_palette_reg(info, regno, red, green, blue); 221 } 222 223 return 0; 224} 225 226static int gxfb_blank(int blank_mode, struct fb_info *info) 227{ 228 return gx_blank_display(info, blank_mode); 229} 230 231static int __devinit gxfb_map_video_memory(struct fb_info *info, 232 struct pci_dev *dev) 233{ 234 struct gxfb_par *par = info->par; 235 int ret; 236 237 ret = pci_enable_device(dev); 238 if (ret < 0) 239 return ret; 240 241 ret = pci_request_region(dev, 3, "gxfb (video processor)"); 242 if (ret < 0) 243 return ret; 244 par->vid_regs = pci_ioremap_bar(dev, 3); 245 if (!par->vid_regs) 246 return -ENOMEM; 247 248 ret = pci_request_region(dev, 2, "gxfb (display controller)"); 249 if (ret < 0) 250 return ret; 251 par->dc_regs = pci_ioremap_bar(dev, 2); 252 if (!par->dc_regs) 253 return -ENOMEM; 254 255 ret = pci_request_region(dev, 1, "gxfb (graphics processor)"); 256 if (ret < 0) 257 return ret; 258 par->gp_regs = pci_ioremap_bar(dev, 1); 259 260 if (!par->gp_regs) 261 return -ENOMEM; 262 263 ret = pci_request_region(dev, 0, "gxfb (framebuffer)"); 264 if (ret < 0) 265 return ret; 266 267 info->fix.smem_start = pci_resource_start(dev, 0); 268 info->fix.smem_len = vram ? vram : gx_frame_buffer_size(); 269 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); 270 if (!info->screen_base) 271 return -ENOMEM; 272 273 /* Set the 16MiB aligned base address of the graphics memory region 274 * in the display controller */ 275 276 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000); 277 278 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n", 279 info->fix.smem_len / 1024, info->fix.smem_start); 280 281 return 0; 282} 283 284static struct fb_ops gxfb_ops = { 285 .owner = THIS_MODULE, 286 .fb_check_var = gxfb_check_var, 287 .fb_set_par = gxfb_set_par, 288 .fb_setcolreg = gxfb_setcolreg, 289 .fb_blank = gxfb_blank, 290 /* No HW acceleration for now. */ 291 .fb_fillrect = cfb_fillrect, 292 .fb_copyarea = cfb_copyarea, 293 .fb_imageblit = cfb_imageblit, 294}; 295 296static struct fb_info *__devinit gxfb_init_fbinfo(struct device *dev) 297{ 298 struct gxfb_par *par; 299 struct fb_info *info; 300 301 /* Alloc enough space for the pseudo palette. */ 302 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16, 303 dev); 304 if (!info) 305 return NULL; 306 307 par = info->par; 308 309 strcpy(info->fix.id, "Geode GX"); 310 311 info->fix.type = FB_TYPE_PACKED_PIXELS; 312 info->fix.type_aux = 0; 313 info->fix.xpanstep = 0; 314 info->fix.ypanstep = 0; 315 info->fix.ywrapstep = 0; 316 info->fix.accel = FB_ACCEL_NONE; 317 318 info->var.nonstd = 0; 319 info->var.activate = FB_ACTIVATE_NOW; 320 info->var.height = -1; 321 info->var.width = -1; 322 info->var.accel_flags = 0; 323 info->var.vmode = FB_VMODE_NONINTERLACED; 324 325 info->fbops = &gxfb_ops; 326 info->flags = FBINFO_DEFAULT; 327 info->node = -1; 328 329 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par); 330 331 info->var.grayscale = 0; 332 333 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 334 framebuffer_release(info); 335 return NULL; 336 } 337 338 return info; 339} 340 341#ifdef CONFIG_PM 342static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state) 343{ 344 struct fb_info *info = pci_get_drvdata(pdev); 345 346 if (state.event == PM_EVENT_SUSPEND) { 347 console_lock(); 348 gx_powerdown(info); 349 fb_set_suspend(info, 1); 350 console_unlock(); 351 } 352 353 /* there's no point in setting PCI states; we emulate PCI, so 354 * we don't end up getting power savings anyways */ 355 356 return 0; 357} 358 359static int gxfb_resume(struct pci_dev *pdev) 360{ 361 struct fb_info *info = pci_get_drvdata(pdev); 362 int ret; 363 364 console_lock(); 365 ret = gx_powerup(info); 366 if (ret) { 367 printk(KERN_ERR "gxfb: power up failed!\n"); 368 return ret; 369 } 370 371 fb_set_suspend(info, 0); 372 console_unlock(); 373 return 0; 374} 375#endif 376 377static int __devinit gxfb_probe(struct pci_dev *pdev, 378 const struct pci_device_id *id) 379{ 380 struct gxfb_par *par; 381 struct fb_info *info; 382 int ret; 383 unsigned long val; 384 385 struct fb_videomode *modedb_ptr; 386 unsigned int modedb_size; 387 388 info = gxfb_init_fbinfo(&pdev->dev); 389 if (!info) 390 return -ENOMEM; 391 par = info->par; 392 393 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) { 394 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n"); 395 goto err; 396 } 397 398 /* Figure out if this is a TFT or CRT part */ 399 400 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val); 401 402 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP) 403 par->enable_crt = 0; 404 else 405 par->enable_crt = 1; 406 407 get_modedb(&modedb_ptr, &modedb_size); 408 ret = fb_find_mode(&info->var, info, mode_option, 409 modedb_ptr, modedb_size, NULL, 16); 410 if (ret == 0 || ret == 4) { 411 dev_err(&pdev->dev, "could not find valid video mode\n"); 412 ret = -EINVAL; 413 goto err; 414 } 415 416 417 /* Clear the frame buffer of garbage. */ 418 memset_io(info->screen_base, 0, info->fix.smem_len); 419 420 gxfb_check_var(&info->var, info); 421 gxfb_set_par(info); 422 423 pm_set_vt_switch(vt_switch); 424 425 if (register_framebuffer(info) < 0) { 426 ret = -EINVAL; 427 goto err; 428 } 429 pci_set_drvdata(pdev, info); 430 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id); 431 return 0; 432 433 err: 434 if (info->screen_base) { 435 iounmap(info->screen_base); 436 pci_release_region(pdev, 0); 437 } 438 if (par->vid_regs) { 439 iounmap(par->vid_regs); 440 pci_release_region(pdev, 3); 441 } 442 if (par->dc_regs) { 443 iounmap(par->dc_regs); 444 pci_release_region(pdev, 2); 445 } 446 if (par->gp_regs) { 447 iounmap(par->gp_regs); 448 pci_release_region(pdev, 1); 449 } 450 451 if (info) { 452 fb_dealloc_cmap(&info->cmap); 453 framebuffer_release(info); 454 } 455 return ret; 456} 457 458static void __devexit gxfb_remove(struct pci_dev *pdev) 459{ 460 struct fb_info *info = pci_get_drvdata(pdev); 461 struct gxfb_par *par = info->par; 462 463 unregister_framebuffer(info); 464 465 iounmap((void __iomem *)info->screen_base); 466 pci_release_region(pdev, 0); 467 468 iounmap(par->vid_regs); 469 pci_release_region(pdev, 3); 470 471 iounmap(par->dc_regs); 472 pci_release_region(pdev, 2); 473 474 iounmap(par->gp_regs); 475 pci_release_region(pdev, 1); 476 477 fb_dealloc_cmap(&info->cmap); 478 pci_set_drvdata(pdev, NULL); 479 480 framebuffer_release(info); 481} 482 483static struct pci_device_id gxfb_id_table[] = { 484 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) }, 485 { 0, } 486}; 487 488MODULE_DEVICE_TABLE(pci, gxfb_id_table); 489 490static struct pci_driver gxfb_driver = { 491 .name = "gxfb", 492 .id_table = gxfb_id_table, 493 .probe = gxfb_probe, 494 .remove = gxfb_remove, 495#ifdef CONFIG_PM 496 .suspend = gxfb_suspend, 497 .resume = gxfb_resume, 498#endif 499}; 500 501#ifndef MODULE 502static int __init gxfb_setup(char *options) 503{ 504 505 char *opt; 506 507 if (!options || !*options) 508 return 0; 509 510 while ((opt = strsep(&options, ",")) != NULL) { 511 if (!*opt) 512 continue; 513 514 mode_option = opt; 515 } 516 517 return 0; 518} 519#endif 520 521static int __init gxfb_init(void) 522{ 523#ifndef MODULE 524 char *option = NULL; 525 526 if (fb_get_options("gxfb", &option)) 527 return -ENODEV; 528 529 gxfb_setup(option); 530#endif 531 return pci_register_driver(&gxfb_driver); 532} 533 534static void __exit gxfb_cleanup(void) 535{ 536 pci_unregister_driver(&gxfb_driver); 537} 538 539module_init(gxfb_init); 540module_exit(gxfb_cleanup); 541 542module_param(mode_option, charp, 0); 543MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])"); 544 545module_param(vram, int, 0); 546MODULE_PARM_DESC(vram, "video memory size"); 547 548module_param(vt_switch, int, 0); 549MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume"); 550 551MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX"); 552MODULE_LICENSE("GPL"); 553