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/slab.h>
  29 #include <linux/delay.h>
  30 #include <linux/fb.h>
  31 #include <linux/console.h>
  32 #include <linux/suspend.h>
  33 #include <linux/init.h>
  34 #include <linux/pci.h>
  35 #include <asm/geode.h>
  36
  37 #include "gxfb.h"
  38
  39 static char *mode_option;
  40 static int vram;
  41 static int vt_switch;
  42
  43 /* Modes relevant to the GX (taken from modedb.c) */
  44 static struct fb_videomode gx_modedb[] __initdata = {
  45         /* 640x480-60 VESA */
  46         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
  47           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  48         /* 640x480-75 VESA */
  49         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
  50           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  51         /* 640x480-85 VESA */
  52         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
  53           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  54         /* 800x600-60 VESA */
  55         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
  56           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  57           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  58         /* 800x600-75 VESA */
  59         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
  60           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  61           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  62         /* 800x600-85 VESA */
  63         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
  64           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  65           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  66         /* 1024x768-60 VESA */
  67         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
  68           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  69         /* 1024x768-75 VESA */
  70         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
  71           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  72           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  73         /* 1024x768-85 VESA */
  74         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
  75           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  76           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  77         /* 1280x960-60 VESA */
  78         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
  79           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  80           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  81         /* 1280x960-85 VESA */
  82         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
  83           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  84           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  85         /* 1280x1024-60 VESA */
  86         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
  87           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  88           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  89         /* 1280x1024-75 VESA */
  90         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
  91           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  92           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  93         /* 1280x1024-85 VESA */
  94         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
  95           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  96           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  97         /* 1600x1200-60 VESA */
  98         { NULL, 60, 1600, 1200, 6172, 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         /* 1600x1200-75 VESA */
 102         { NULL, 75, 1600, 1200, 4938, 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         /* 1600x1200-85 VESA */
 106         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 107           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 108           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 109 };
 110
 111 #ifdef CONFIG_OLPC
 112 #include <asm/olpc.h>
 113
 114 static struct fb_videomode gx_dcon_modedb[] __initdata = {
 115         /* The only mode the DCON has is 1200x900 */
 116         { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
 117           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 118           FB_VMODE_NONINTERLACED, 0 }
 119 };
 120
 121 static void __init get_modedb(struct fb_videomode **modedb, 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 __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
 134 {
 135         *modedb = (struct fb_videomode *) gx_modedb;
 136         *size = ARRAY_SIZE(gx_modedb);
 137 }
 138 #endif
 139
 140 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 141 {
 142         if (var->xres > 1600 || var->yres > 1200)
 143                 return -EINVAL;
 144         if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
 145                 return -EINVAL;
 146
 147         if (var->bits_per_pixel == 32) {
 148                 var->red.offset   = 16; var->red.length   = 8;
 149                 var->green.offset =  8; var->green.length = 8;
 150                 var->blue.offset  =  0; var->blue.length  = 8;
 151         } else if (var->bits_per_pixel == 16) {
 152                 var->red.offset   = 11; var->red.length   = 5;
 153                 var->green.offset =  5; var->green.length = 6;
 154                 var->blue.offset  =  0; var->blue.length  = 5;
 155         } else if (var->bits_per_pixel == 8) {
 156                 var->red.offset   = 0; var->red.length   = 8;
 157                 var->green.offset = 0; var->green.length = 8;
 158                 var->blue.offset  = 0; var->blue.length  = 8;
 159         } else
 160                 return -EINVAL;
 161         var->transp.offset = 0; var->transp.length = 0;
 162
 163         /* Enough video memory? */
 164         if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
 165                 return -EINVAL;
 166
 167         /* FIXME: Check timing parameters here? */
 168
 169         return 0;
 170 }
 171
 172 static 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
 186 static 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
 193 static 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
 225 static int gxfb_blank(int blank_mode, struct fb_info *info)
 226 {
 227         return gx_blank_display(info, blank_mode);
 228 }
 229
 230 static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 231 {
 232         struct gxfb_par *par = info->par;
 233         int ret;
 234
 235         ret = pci_enable_device(dev);
 236         if (ret < 0)
 237                 return ret;
 238
 239         ret = pci_request_region(dev, 3, "gxfb (video processor)");
 240         if (ret < 0)
 241                 return ret;
 242         par->vid_regs = pci_ioremap_bar(dev, 3);
 243         if (!par->vid_regs)
 244                 return -ENOMEM;
 245
 246         ret = pci_request_region(dev, 2, "gxfb (display controller)");
 247         if (ret < 0)
 248                 return ret;
 249         par->dc_regs = pci_ioremap_bar(dev, 2);
 250         if (!par->dc_regs)
 251                 return -ENOMEM;
 252
 253         ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
 254         if (ret < 0)
 255                 return ret;
 256         par->gp_regs = pci_ioremap_bar(dev, 1);
 257
 258         if (!par->gp_regs)
 259                 return -ENOMEM;
 260
 261         ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
 262         if (ret < 0)
 263                 return ret;
 264
 265         info->fix.smem_start = pci_resource_start(dev, 0);
 266         info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
 267         info->screen_base = ioremap(info->fix.smem_start, 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
 282 static 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
 294 static struct fb_info * __init 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
 340 static 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                 acquire_console_sem();
 346                 gx_powerdown(info);
 347                 fb_set_suspend(info, 1);
 348                 release_console_sem();
 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
 357 static int gxfb_resume(struct pci_dev *pdev)
 358 {
 359         struct fb_info *info = pci_get_drvdata(pdev);
 360         int ret;
 361
 362         acquire_console_sem();
 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         release_console_sem();
 371         return 0;
 372 }
 373 #endif
 374
 375 static int __init 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         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, 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         if (info) {
 449                 fb_dealloc_cmap(&info->cmap);
 450                 framebuffer_release(info);
 451         }
 452         return ret;
 453 }
 454
 455 static void gxfb_remove(struct pci_dev *pdev)
 456 {
 457         struct fb_info *info = pci_get_drvdata(pdev);
 458         struct gxfb_par *par = info->par;
 459
 460         unregister_framebuffer(info);
 461
 462         iounmap((void __iomem *)info->screen_base);
 463         pci_release_region(pdev, 0);
 464
 465         iounmap(par->vid_regs);
 466         pci_release_region(pdev, 3);
 467
 468         iounmap(par->dc_regs);
 469         pci_release_region(pdev, 2);
 470
 471         iounmap(par->gp_regs);
 472         pci_release_region(pdev, 1);
 473
 474         fb_dealloc_cmap(&info->cmap);
 475         pci_set_drvdata(pdev, NULL);
 476
 477         framebuffer_release(info);
 478 }
 479
 480 static struct pci_device_id gxfb_id_table[] = {
 481         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
 482         { 0, }
 483 };
 484
 485 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
 486
 487 static struct pci_driver gxfb_driver = {
 488         .name           = "gxfb",
 489         .id_table       = gxfb_id_table,
 490         .probe          = gxfb_probe,
 491         .remove         = gxfb_remove,
 492 #ifdef CONFIG_PM
 493         .suspend        = gxfb_suspend,
 494         .resume         = gxfb_resume,
 495 #endif
 496 };
 497
 498 #ifndef MODULE
 499 static int __init gxfb_setup(char *options)
 500 {
 501
 502         char *opt;
 503
 504         if (!options || !*options)
 505                 return 0;
 506
 507         while ((opt = strsep(&options, ",")) != NULL) {
 508                 if (!*opt)
 509                         continue;
 510
 511                 mode_option = opt;
 512         }
 513
 514         return 0;
 515 }
 516 #endif
 517
 518 static int __init gxfb_init(void)
 519 {
 520 #ifndef MODULE
 521         char *option = NULL;
 522
 523         if (fb_get_options("gxfb", &option))
 524                 return -ENODEV;
 525
 526         gxfb_setup(option);
 527 #endif
 528         return pci_register_driver(&gxfb_driver);
 529 }
 530
 531 static void __exit gxfb_cleanup(void)
 532 {
 533         pci_unregister_driver(&gxfb_driver);
 534 }
 535
 536 module_init(gxfb_init);
 537 module_exit(gxfb_cleanup);
 538
 539 module_param(mode_option, charp, 0);
 540 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 541
 542 module_param(vram, int, 0);
 543 MODULE_PARM_DESC(vram, "video memory size");
 544
 545 module_param(vt_switch, int, 0);
 546 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
 547
 548 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 549 MODULE_LICENSE("GPL");