drivers/video/fbdev/geode/gxfb_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Geode GX framebuffer driver.
   4  *
   5  *   Copyright (C) 2006 Arcom Control Systems Ltd.
   6  *
   7  * This driver assumes that the BIOS has created a virtual PCI device header
   8  * for the video device. The PCI header is assumed to contain the following
   9  * BARs:
  10  *
  11  *    BAR0 - framebuffer memory
  12  *    BAR1 - graphics processor registers
  13  *    BAR2 - display controller registers
  14  *    BAR3 - video processor and flat panel control registers.
  15  *
  16  * 16 MiB of framebuffer memory is assumed to be available.
  17  */
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/errno.h>
  21 #include <linux/string.h>
  22 #include <linux/mm.h>
  23 #include <linux/delay.h>
  24 #include <linux/fb.h>
  25 #include <linux/console.h>
  26 #include <linux/suspend.h>
  27 #include <linux/init.h>
  28 #include <linux/pci.h>
  29 #include <linux/cs5535.h>
  30
  31 #include <asm/olpc.h>
  32
  33 #include "gxfb.h"
  34
  35 static char *mode_option;
  36 static int vram;
  37 static int vt_switch;
  38
  39 /* Modes relevant to the GX (taken from modedb.c) */
  40 static struct fb_videomode gx_modedb[] = {
  41         /* 640x480-60 VESA */
  42         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
  43           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  44         /* 640x480-75 VESA */
  45         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
  46           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  47         /* 640x480-85 VESA */
  48         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
  49           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  50         /* 800x600-60 VESA */
  51         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
  52           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  53           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  54         /* 800x600-75 VESA */
  55         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
  56           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  57           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  58         /* 800x600-85 VESA */
  59         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
  60           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  61           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  62         /* 1024x768-60 VESA */
  63         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
  64           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  65         /* 1024x768-75 VESA */
  66         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
  67           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  68           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  69         /* 1024x768-85 VESA */
  70         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
  71           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  72           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  73         /* 1280x960-60 VESA */
  74         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
  75           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  76           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  77         /* 1280x960-85 VESA */
  78         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
  79           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  80           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  81         /* 1280x1024-60 VESA */
  82         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
  83           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  84           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  85         /* 1280x1024-75 VESA */
  86         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
  87           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  88           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  89         /* 1280x1024-85 VESA */
  90         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
  91           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  92           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  93         /* 1600x1200-60 VESA */
  94         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
  95           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  96           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  97         /* 1600x1200-75 VESA */
  98         { NULL, 75, 1600, 1200, 4938, 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         /* 1600x1200-85 VESA */
 102         { NULL, 85, 1600, 1200, 4357, 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 };
 106
 107 static struct fb_videomode gx_dcon_modedb[] = {
 108         /* The only mode the DCON has is 1200x900 */
 109         { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
 110           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 111           FB_VMODE_NONINTERLACED, 0 }
 112 };
 113
 114 static void get_modedb(struct fb_videomode **modedb, unsigned int *size)
 115 {
 116         if (olpc_has_dcon()) {
 117                 *modedb = (struct fb_videomode *) gx_dcon_modedb;
 118                 *size = ARRAY_SIZE(gx_dcon_modedb);
 119         } else {
 120                 *modedb = (struct fb_videomode *) gx_modedb;
 121                 *size = ARRAY_SIZE(gx_modedb);
 122         }
 123 }
 124
 125 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 126 {
 127         if (var->xres > 1600 || var->yres > 1200)
 128                 return -EINVAL;
 129         if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
 130                 return -EINVAL;
 131
 132         if (var->bits_per_pixel == 32) {
 133                 var->red.offset   = 16; var->red.length   = 8;
 134                 var->green.offset =  8; var->green.length = 8;
 135                 var->blue.offset  =  0; var->blue.length  = 8;
 136         } else if (var->bits_per_pixel == 16) {
 137                 var->red.offset   = 11; var->red.length   = 5;
 138                 var->green.offset =  5; var->green.length = 6;
 139                 var->blue.offset  =  0; var->blue.length  = 5;
 140         } else if (var->bits_per_pixel == 8) {
 141                 var->red.offset   = 0; var->red.length   = 8;
 142                 var->green.offset = 0; var->green.length = 8;
 143                 var->blue.offset  = 0; var->blue.length  = 8;
 144         } else
 145                 return -EINVAL;
 146         var->transp.offset = 0; var->transp.length = 0;
 147
 148         /* Enough video memory? */
 149         if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
 150                 return -EINVAL;
 151
 152         /* FIXME: Check timing parameters here? */
 153
 154         return 0;
 155 }
 156
 157 static int gxfb_set_par(struct fb_info *info)
 158 {
 159         if (info->var.bits_per_pixel > 8)
 160                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 161         else
 162                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 163
 164         info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
 165
 166         gx_set_mode(info);
 167
 168         return 0;
 169 }
 170
 171 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 172 {
 173         chan &= 0xffff;
 174         chan >>= 16 - bf->length;
 175         return chan << bf->offset;
 176 }
 177
 178 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 179                            unsigned blue, unsigned transp,
 180                            struct fb_info *info)
 181 {
 182         if (info->var.grayscale) {
 183                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 184                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 185         }
 186
 187         /* Truecolor has hardware independent palette */
 188         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 189                 u32 *pal = info->pseudo_palette;
 190                 u32 v;
 191
 192                 if (regno >= 16)
 193                         return -EINVAL;
 194
 195                 v  = chan_to_field(red, &info->var.red);
 196                 v |= chan_to_field(green, &info->var.green);
 197                 v |= chan_to_field(blue, &info->var.blue);
 198
 199                 pal[regno] = v;
 200         } else {
 201                 if (regno >= 256)
 202                         return -EINVAL;
 203
 204                 gx_set_hw_palette_reg(info, regno, red, green, blue);
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int gxfb_blank(int blank_mode, struct fb_info *info)
 211 {
 212         return gx_blank_display(info, blank_mode);
 213 }
 214
 215 static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 216 {
 217         struct gxfb_par *par = info->par;
 218         int ret;
 219
 220         ret = pci_enable_device(dev);
 221         if (ret < 0)
 222                 return ret;
 223
 224         ret = pci_request_region(dev, 3, "gxfb (video processor)");
 225         if (ret < 0)
 226                 return ret;
 227         par->vid_regs = pci_ioremap_bar(dev, 3);
 228         if (!par->vid_regs)
 229                 return -ENOMEM;
 230
 231         ret = pci_request_region(dev, 2, "gxfb (display controller)");
 232         if (ret < 0)
 233                 return ret;
 234         par->dc_regs = pci_ioremap_bar(dev, 2);
 235         if (!par->dc_regs)
 236                 return -ENOMEM;
 237
 238         ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
 239         if (ret < 0)
 240                 return ret;
 241         par->gp_regs = pci_ioremap_bar(dev, 1);
 242
 243         if (!par->gp_regs)
 244                 return -ENOMEM;
 245
 246         ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
 247         if (ret < 0)
 248                 return ret;
 249
 250         info->fix.smem_start = pci_resource_start(dev, 0);
 251         info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
 252         info->screen_base = ioremap_wc(info->fix.smem_start,
 253                                        info->fix.smem_len);
 254         if (!info->screen_base)
 255                 return -ENOMEM;
 256
 257         /* Set the 16MiB aligned base address of the graphics memory region
 258          * in the display controller */
 259
 260         write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
 261
 262         dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
 263                  info->fix.smem_len / 1024, info->fix.smem_start);
 264
 265         return 0;
 266 }
 267
 268 static const struct fb_ops gxfb_ops = {
 269         .owner          = THIS_MODULE,
 270         .fb_check_var   = gxfb_check_var,
 271         .fb_set_par     = gxfb_set_par,
 272         .fb_setcolreg   = gxfb_setcolreg,
 273         .fb_blank       = gxfb_blank,
 274         /* No HW acceleration for now. */
 275         .fb_fillrect    = cfb_fillrect,
 276         .fb_copyarea    = cfb_copyarea,
 277         .fb_imageblit   = cfb_imageblit,
 278 };
 279
 280 static struct fb_info *gxfb_init_fbinfo(struct device *dev)
 281 {
 282         struct gxfb_par *par;
 283         struct fb_info *info;
 284
 285         /* Alloc enough space for the pseudo palette. */
 286         info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
 287                         dev);
 288         if (!info)
 289                 return NULL;
 290
 291         par = info->par;
 292
 293         strcpy(info->fix.id, "Geode GX");
 294
 295         info->fix.type          = FB_TYPE_PACKED_PIXELS;
 296         info->fix.type_aux      = 0;
 297         info->fix.xpanstep      = 0;
 298         info->fix.ypanstep      = 0;
 299         info->fix.ywrapstep     = 0;
 300         info->fix.accel         = FB_ACCEL_NONE;
 301
 302         info->var.nonstd        = 0;
 303         info->var.activate      = FB_ACTIVATE_NOW;
 304         info->var.height        = -1;
 305         info->var.width = -1;
 306         info->var.accel_flags = 0;
 307         info->var.vmode = FB_VMODE_NONINTERLACED;
 308
 309         info->fbops             = &gxfb_ops;
 310         info->flags             = FBINFO_DEFAULT;
 311         info->node              = -1;
 312
 313         info->pseudo_palette    = (void *)par + sizeof(struct gxfb_par);
 314
 315         info->var.grayscale     = 0;
 316
 317         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 318                 framebuffer_release(info);
 319                 return NULL;
 320         }
 321
 322         return info;
 323 }
 324
 325 static int __maybe_unused gxfb_suspend(struct device *dev)
 326 {
 327         struct fb_info *info = dev_get_drvdata(dev);
 328
 329         console_lock();
 330         gx_powerdown(info);
 331         fb_set_suspend(info, 1);
 332         console_unlock();
 333
 334         /* there's no point in setting PCI states; we emulate PCI, so
 335          * we don't end up getting power savings anyways */
 336
 337         return 0;
 338 }
 339
 340 static int __maybe_unused gxfb_resume(struct device *dev)
 341 {
 342         struct fb_info *info = dev_get_drvdata(dev);
 343         int ret;
 344
 345         console_lock();
 346         ret = gx_powerup(info);
 347         if (ret) {
 348                 printk(KERN_ERR "gxfb:  power up failed!\n");
 349                 return ret;
 350         }
 351
 352         fb_set_suspend(info, 0);
 353         console_unlock();
 354         return 0;
 355 }
 356
 357 static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 358 {
 359         struct gxfb_par *par;
 360         struct fb_info *info;
 361         int ret;
 362         unsigned long val;
 363
 364         struct fb_videomode *modedb_ptr;
 365         unsigned int modedb_size;
 366
 367         info = gxfb_init_fbinfo(&pdev->dev);
 368         if (!info)
 369                 return -ENOMEM;
 370         par = info->par;
 371
 372         if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
 373                 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
 374                 goto err;
 375         }
 376
 377         /* Figure out if this is a TFT or CRT part */
 378
 379         rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
 380
 381         if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
 382                 par->enable_crt = 0;
 383         else
 384                 par->enable_crt = 1;
 385
 386         get_modedb(&modedb_ptr, &modedb_size);
 387         ret = fb_find_mode(&info->var, info, mode_option,
 388                            modedb_ptr, modedb_size, NULL, 16);
 389         if (ret == 0 || ret == 4) {
 390                 dev_err(&pdev->dev, "could not find valid video mode\n");
 391                 ret = -EINVAL;
 392                 goto err;
 393         }
 394
 395
 396         /* Clear the frame buffer of garbage. */
 397         memset_io(info->screen_base, 0, info->fix.smem_len);
 398
 399         gxfb_check_var(&info->var, info);
 400         gxfb_set_par(info);
 401
 402         pm_set_vt_switch(vt_switch);
 403
 404         if (register_framebuffer(info) < 0) {
 405                 ret = -EINVAL;
 406                 goto err;
 407         }
 408         pci_set_drvdata(pdev, info);
 409         fb_info(info, "%s frame buffer device\n", info->fix.id);
 410         return 0;
 411
 412   err:
 413         if (info->screen_base) {
 414                 iounmap(info->screen_base);
 415                 pci_release_region(pdev, 0);
 416         }
 417         if (par->vid_regs) {
 418                 iounmap(par->vid_regs);
 419                 pci_release_region(pdev, 3);
 420         }
 421         if (par->dc_regs) {
 422                 iounmap(par->dc_regs);
 423                 pci_release_region(pdev, 2);
 424         }
 425         if (par->gp_regs) {
 426                 iounmap(par->gp_regs);
 427                 pci_release_region(pdev, 1);
 428         }
 429
 430         fb_dealloc_cmap(&info->cmap);
 431         framebuffer_release(info);
 432         return ret;
 433 }
 434
 435 static void gxfb_remove(struct pci_dev *pdev)
 436 {
 437         struct fb_info *info = pci_get_drvdata(pdev);
 438         struct gxfb_par *par = info->par;
 439
 440         unregister_framebuffer(info);
 441
 442         iounmap((void __iomem *)info->screen_base);
 443         pci_release_region(pdev, 0);
 444
 445         iounmap(par->vid_regs);
 446         pci_release_region(pdev, 3);
 447
 448         iounmap(par->dc_regs);
 449         pci_release_region(pdev, 2);
 450
 451         iounmap(par->gp_regs);
 452         pci_release_region(pdev, 1);
 453
 454         fb_dealloc_cmap(&info->cmap);
 455
 456         framebuffer_release(info);
 457 }
 458
 459 static const struct pci_device_id gxfb_id_table[] = {
 460         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
 461         { 0, }
 462 };
 463
 464 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
 465
 466 static const struct dev_pm_ops gxfb_pm_ops = {
 467 #ifdef CONFIG_PM_SLEEP
 468         .suspend        = gxfb_suspend,
 469         .resume         = gxfb_resume,
 470         .freeze         = NULL,
 471         .thaw           = gxfb_resume,
 472         .poweroff       = NULL,
 473         .restore        = gxfb_resume,
 474 #endif
 475 };
 476
 477 static struct pci_driver gxfb_driver = {
 478         .name           = "gxfb",
 479         .id_table       = gxfb_id_table,
 480         .probe          = gxfb_probe,
 481         .remove         = gxfb_remove,
 482         .driver.pm      = &gxfb_pm_ops,
 483 };
 484
 485 #ifndef MODULE
 486 static int __init gxfb_setup(char *options)
 487 {
 488
 489         char *opt;
 490
 491         if (!options || !*options)
 492                 return 0;
 493
 494         while ((opt = strsep(&options, ",")) != NULL) {
 495                 if (!*opt)
 496                         continue;
 497
 498                 mode_option = opt;
 499         }
 500
 501         return 0;
 502 }
 503 #endif
 504
 505 static int __init gxfb_init(void)
 506 {
 507 #ifndef MODULE
 508         char *option = NULL;
 509
 510         if (fb_get_options("gxfb", &option))
 511                 return -ENODEV;
 512
 513         gxfb_setup(option);
 514 #endif
 515         return pci_register_driver(&gxfb_driver);
 516 }
 517
 518 static void __exit gxfb_cleanup(void)
 519 {
 520         pci_unregister_driver(&gxfb_driver);
 521 }
 522
 523 module_init(gxfb_init);
 524 module_exit(gxfb_cleanup);
 525
 526 module_param(mode_option, charp, 0);
 527 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 528
 529 module_param(vram, int, 0);
 530 MODULE_PARM_DESC(vram, "video memory size");
 531
 532 module_param(vt_switch, int, 0);
 533 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
 534
 535 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 536 MODULE_LICENSE("GPL");