drivers/video/geode/gxfb_core.c

   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
  38 static char *mode_option;
  39 static int vram;
  40 static int vt_switch;
  41
  42 /* Modes relevant to the GX (taken from modedb.c) */
  43 static 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
 113 static 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
 120 static 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
 133 static 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
 141 static 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
 173 static 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
 187 static 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
 194 static 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
 226 static int gxfb_blank(int blank_mode, struct fb_info *info)
 227 {
 228         return gx_blank_display(info, blank_mode);
 229 }
 230
 231 static 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
 284 static 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
 296 static 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
 342 static 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                 acquire_console_sem();
 348                 gx_powerdown(info);
 349                 fb_set_suspend(info, 1);
 350                 release_console_sem();
 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
 359 static int gxfb_resume(struct pci_dev *pdev)
 360 {
 361         struct fb_info *info = pci_get_drvdata(pdev);
 362         int ret;
 363
 364         acquire_console_sem();
 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         release_console_sem();
 373         return 0;
 374 }
 375 #endif
 376
 377 static 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
 458 static 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
 483 static struct pci_device_id gxfb_id_table[] = {
 484         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
 485         { 0, }
 486 };
 487
 488 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
 489
 490 static 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
 502 static 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
 521 static 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
 534 static void __exit gxfb_cleanup(void)
 535 {
 536         pci_unregister_driver(&gxfb_driver);
 537 }
 538
 539 module_init(gxfb_init);
 540 module_exit(gxfb_cleanup);
 541
 542 module_param(mode_option, charp, 0);
 543 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 544
 545 module_param(vram, int, 0);
 546 MODULE_PARM_DESC(vram, "video memory size");
 547
 548 module_param(vt_switch, int, 0);
 549 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
 550
 551 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 552 MODULE_LICENSE("GPL");