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