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/aperture.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/string.h>
  23 #include <linux/mm.h>
  24 #include <linux/delay.h>
  25 #include <linux/fb.h>
  26 #include <linux/console.h>
  27 #include <linux/suspend.h>
  28 #include <linux/init.h>
  29 #include <linux/pci.h>
  30 #include <linux/cs5535.h>
  31
  32 #include <asm/olpc.h>
  33
  34 #include "gxfb.h"
  35
  36 static char *mode_option;
  37 static int vram;
  38 static int vt_switch;
  39
  40 /* Modes relevant to the GX (taken from modedb.c) */
  41 static struct fb_videomode gx_modedb[] = {
  42         /* 640x480-60 VESA */
  43         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
  44           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  45         /* 640x480-75 VESA */
  46         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
  47           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  48         /* 640x480-85 VESA */
  49         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
  50           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  51         /* 800x600-60 VESA */
  52         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
  53           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  54           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  55         /* 800x600-75 VESA */
  56         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
  57           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  58           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  59         /* 800x600-85 VESA */
  60         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
  61           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  62           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  63         /* 1024x768-60 VESA */
  64         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
  65           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  66         /* 1024x768-75 VESA */
  67         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
  68           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  69           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  70         /* 1024x768-85 VESA */
  71         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
  72           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  73           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  74         /* 1280x960-60 VESA */
  75         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
  76           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  77           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  78         /* 1280x960-85 VESA */
  79         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
  80           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  81           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  82         /* 1280x1024-60 VESA */
  83         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
  84           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  85           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  86         /* 1280x1024-75 VESA */
  87         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
  88           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  89           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  90         /* 1280x1024-85 VESA */
  91         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
  92           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  93           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  94         /* 1600x1200-60 VESA */
  95         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
  96           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  97           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  98         /* 1600x1200-75 VESA */
  99         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 100           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 101           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 102         /* 1600x1200-85 VESA */
 103         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 104           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 105           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 106 };
 107
 108 static struct fb_videomode gx_dcon_modedb[] = {
 109         /* The only mode the DCON has is 1200x900 */
 110         { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
 111           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 112           FB_VMODE_NONINTERLACED, 0 }
 113 };
 114
 115 static void get_modedb(struct fb_videomode **modedb, unsigned int *size)
 116 {
 117         if (olpc_has_dcon()) {
 118                 *modedb = (struct fb_videomode *) gx_dcon_modedb;
 119                 *size = ARRAY_SIZE(gx_dcon_modedb);
 120         } else {
 121                 *modedb = (struct fb_videomode *) gx_modedb;
 122                 *size = ARRAY_SIZE(gx_modedb);
 123         }
 124 }
 125
 126 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 127 {
 128         if (var->xres > 1600 || var->yres > 1200)
 129                 return -EINVAL;
 130         if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
 131                 return -EINVAL;
 132
 133         if (var->bits_per_pixel == 32) {
 134                 var->red.offset   = 16; var->red.length   = 8;
 135                 var->green.offset =  8; var->green.length = 8;
 136                 var->blue.offset  =  0; var->blue.length  = 8;
 137         } else if (var->bits_per_pixel == 16) {
 138                 var->red.offset   = 11; var->red.length   = 5;
 139                 var->green.offset =  5; var->green.length = 6;
 140                 var->blue.offset  =  0; var->blue.length  = 5;
 141         } else if (var->bits_per_pixel == 8) {
 142                 var->red.offset   = 0; var->red.length   = 8;
 143                 var->green.offset = 0; var->green.length = 8;
 144                 var->blue.offset  = 0; var->blue.length  = 8;
 145         } else
 146                 return -EINVAL;
 147         var->transp.offset = 0; var->transp.length = 0;
 148
 149         /* Enough video memory? */
 150         if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
 151                 return -EINVAL;
 152
 153         /* FIXME: Check timing parameters here? */
 154
 155         return 0;
 156 }
 157
 158 static int gxfb_set_par(struct fb_info *info)
 159 {
 160         if (info->var.bits_per_pixel > 8)
 161                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 162         else
 163                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 164
 165         info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
 166
 167         gx_set_mode(info);
 168
 169         return 0;
 170 }
 171
 172 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 173 {
 174         chan &= 0xffff;
 175         chan >>= 16 - bf->length;
 176         return chan << bf->offset;
 177 }
 178
 179 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 180                            unsigned blue, unsigned transp,
 181                            struct fb_info *info)
 182 {
 183         if (info->var.grayscale) {
 184                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 185                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 186         }
 187
 188         /* Truecolor has hardware independent palette */
 189         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 190                 u32 *pal = info->pseudo_palette;
 191                 u32 v;
 192
 193                 if (regno >= 16)
 194                         return -EINVAL;
 195
 196                 v  = chan_to_field(red, &info->var.red);
 197                 v |= chan_to_field(green, &info->var.green);
 198                 v |= chan_to_field(blue, &info->var.blue);
 199
 200                 pal[regno] = v;
 201         } else {
 202                 if (regno >= 256)
 203                         return -EINVAL;
 204
 205                 gx_set_hw_palette_reg(info, regno, red, green, blue);
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int gxfb_blank(int blank_mode, struct fb_info *info)
 212 {
 213         return gx_blank_display(info, blank_mode);
 214 }
 215
 216 static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 217 {
 218         struct gxfb_par *par = info->par;
 219         int ret;
 220
 221         ret = pci_enable_device(dev);
 222         if (ret < 0)
 223                 return ret;
 224
 225         ret = pci_request_region(dev, 3, "gxfb (video processor)");
 226         if (ret < 0)
 227                 return ret;
 228         par->vid_regs = pci_ioremap_bar(dev, 3);
 229         if (!par->vid_regs)
 230                 return -ENOMEM;
 231
 232         ret = pci_request_region(dev, 2, "gxfb (display controller)");
 233         if (ret < 0)
 234                 return ret;
 235         par->dc_regs = pci_ioremap_bar(dev, 2);
 236         if (!par->dc_regs)
 237                 return -ENOMEM;
 238
 239         ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
 240         if (ret < 0)
 241                 return ret;
 242         par->gp_regs = pci_ioremap_bar(dev, 1);
 243
 244         if (!par->gp_regs)
 245                 return -ENOMEM;
 246
 247         ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
 248         if (ret < 0)
 249                 return ret;
 250
 251         info->fix.smem_start = pci_resource_start(dev, 0);
 252         info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
 253         info->screen_base = ioremap_wc(info->fix.smem_start,
 254                                        info->fix.smem_len);
 255         if (!info->screen_base)
 256                 return -ENOMEM;
 257
 258         /* Set the 16MiB aligned base address of the graphics memory region
 259          * in the display controller */
 260
 261         write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
 262
 263         dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
 264                  info->fix.smem_len / 1024, info->fix.smem_start);
 265
 266         return 0;
 267 }
 268
 269 static const struct fb_ops gxfb_ops = {
 270         .owner          = THIS_MODULE,
 271         FB_DEFAULT_IOMEM_OPS,
 272         .fb_check_var   = gxfb_check_var,
 273         .fb_set_par     = gxfb_set_par,
 274         .fb_setcolreg   = gxfb_setcolreg,
 275         .fb_blank       = gxfb_blank,
 276 };
 277
 278 static struct fb_info *gxfb_init_fbinfo(struct device *dev)
 279 {
 280         struct gxfb_par *par;
 281         struct fb_info *info;
 282
 283         /* Alloc enough space for the pseudo palette. */
 284         info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
 285                         dev);
 286         if (!info)
 287                 return NULL;
 288
 289         par = info->par;
 290
 291         strcpy(info->fix.id, "Geode GX");
 292
 293         info->fix.type          = FB_TYPE_PACKED_PIXELS;
 294         info->fix.type_aux      = 0;
 295         info->fix.xpanstep      = 0;
 296         info->fix.ypanstep      = 0;
 297         info->fix.ywrapstep     = 0;
 298         info->fix.accel         = FB_ACCEL_NONE;
 299
 300         info->var.nonstd        = 0;
 301         info->var.activate      = FB_ACTIVATE_NOW;
 302         info->var.height        = -1;
 303         info->var.width = -1;
 304         info->var.accel_flags = 0;
 305         info->var.vmode = FB_VMODE_NONINTERLACED;
 306
 307         info->fbops             = &gxfb_ops;
 308         info->node              = -1;
 309
 310         info->pseudo_palette    = (void *)par + sizeof(struct gxfb_par);
 311
 312         info->var.grayscale     = 0;
 313
 314         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 315                 framebuffer_release(info);
 316                 return NULL;
 317         }
 318
 319         return info;
 320 }
 321
 322 static int __maybe_unused gxfb_suspend(struct device *dev)
 323 {
 324         struct fb_info *info = dev_get_drvdata(dev);
 325
 326         console_lock();
 327         gx_powerdown(info);
 328         fb_set_suspend(info, 1);
 329         console_unlock();
 330
 331         /* there's no point in setting PCI states; we emulate PCI, so
 332          * we don't end up getting power savings anyways */
 333
 334         return 0;
 335 }
 336
 337 static int __maybe_unused gxfb_resume(struct device *dev)
 338 {
 339         struct fb_info *info = dev_get_drvdata(dev);
 340         int ret;
 341
 342         console_lock();
 343         ret = gx_powerup(info);
 344         if (ret) {
 345                 printk(KERN_ERR "gxfb:  power up failed!\n");
 346                 return ret;
 347         }
 348
 349         fb_set_suspend(info, 0);
 350         console_unlock();
 351         return 0;
 352 }
 353
 354 static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 355 {
 356         struct gxfb_par *par;
 357         struct fb_info *info;
 358         int ret;
 359         unsigned long val;
 360
 361         struct fb_videomode *modedb_ptr;
 362         unsigned int modedb_size;
 363
 364         ret = aperture_remove_conflicting_pci_devices(pdev, "gxfb");
 365         if (ret)
 366                 return ret;
 367
 368         info = gxfb_init_fbinfo(&pdev->dev);
 369         if (!info)
 370                 return -ENOMEM;
 371         par = info->par;
 372
 373         if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
 374                 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
 375                 goto err;
 376         }
 377
 378         /* Figure out if this is a TFT or CRT part */
 379
 380         rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
 381
 382         if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
 383                 par->enable_crt = 0;
 384         else
 385                 par->enable_crt = 1;
 386
 387         get_modedb(&modedb_ptr, &modedb_size);
 388         ret = fb_find_mode(&info->var, info, mode_option,
 389                            modedb_ptr, modedb_size, NULL, 16);
 390         if (ret == 0 || ret == 4) {
 391                 dev_err(&pdev->dev, "could not find valid video mode\n");
 392                 ret = -EINVAL;
 393                 goto err;
 394         }
 395
 396
 397         /* Clear the frame buffer of garbage. */
 398         memset_io(info->screen_base, 0, info->fix.smem_len);
 399
 400         gxfb_check_var(&info->var, info);
 401         gxfb_set_par(info);
 402
 403         pm_set_vt_switch(vt_switch);
 404
 405         if (register_framebuffer(info) < 0) {
 406                 ret = -EINVAL;
 407                 goto err;
 408         }
 409         pci_set_drvdata(pdev, info);
 410         fb_info(info, "%s frame buffer device\n", info->fix.id);
 411         return 0;
 412
 413   err:
 414         if (info->screen_base) {
 415                 iounmap(info->screen_base);
 416                 pci_release_region(pdev, 0);
 417         }
 418         if (par->vid_regs) {
 419                 iounmap(par->vid_regs);
 420                 pci_release_region(pdev, 3);
 421         }
 422         if (par->dc_regs) {
 423                 iounmap(par->dc_regs);
 424                 pci_release_region(pdev, 2);
 425         }
 426         if (par->gp_regs) {
 427                 iounmap(par->gp_regs);
 428                 pci_release_region(pdev, 1);
 429         }
 430
 431         fb_dealloc_cmap(&info->cmap);
 432         framebuffer_release(info);
 433         return ret;
 434 }
 435
 436 static void gxfb_remove(struct pci_dev *pdev)
 437 {
 438         struct fb_info *info = pci_get_drvdata(pdev);
 439         struct gxfb_par *par = info->par;
 440
 441         unregister_framebuffer(info);
 442
 443         iounmap((void __iomem *)info->screen_base);
 444         pci_release_region(pdev, 0);
 445
 446         iounmap(par->vid_regs);
 447         pci_release_region(pdev, 3);
 448
 449         iounmap(par->dc_regs);
 450         pci_release_region(pdev, 2);
 451
 452         iounmap(par->gp_regs);
 453         pci_release_region(pdev, 1);
 454
 455         fb_dealloc_cmap(&info->cmap);
 456
 457         framebuffer_release(info);
 458 }
 459
 460 static const struct pci_device_id gxfb_id_table[] = {
 461         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
 462         { 0, }
 463 };
 464
 465 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
 466
 467 static const struct dev_pm_ops gxfb_pm_ops = {
 468 #ifdef CONFIG_PM_SLEEP
 469         .suspend        = gxfb_suspend,
 470         .resume         = gxfb_resume,
 471         .freeze         = NULL,
 472         .thaw           = gxfb_resume,
 473         .poweroff       = NULL,
 474         .restore        = gxfb_resume,
 475 #endif
 476 };
 477
 478 static struct pci_driver gxfb_driver = {
 479         .name           = "gxfb",
 480         .id_table       = gxfb_id_table,
 481         .probe          = gxfb_probe,
 482         .remove         = gxfb_remove,
 483         .driver.pm      = &gxfb_pm_ops,
 484 };
 485
 486 #ifndef MODULE
 487 static int __init gxfb_setup(char *options)
 488 {
 489
 490         char *opt;
 491
 492         if (!options || !*options)
 493                 return 0;
 494
 495         while ((opt = strsep(&options, ",")) != NULL) {
 496                 if (!*opt)
 497                         continue;
 498
 499                 mode_option = opt;
 500         }
 501
 502         return 0;
 503 }
 504 #endif
 505
 506 static int __init gxfb_init(void)
 507 {
 508 #ifndef MODULE
 509         char *option = NULL;
 510 #endif
 511
 512         if (fb_modesetting_disabled("gxfb"))
 513                 return -ENODEV;
 514
 515 #ifndef MODULE
 516         if (fb_get_options("gxfb", &option))
 517                 return -ENODEV;
 518
 519         gxfb_setup(option);
 520 #endif
 521         return pci_register_driver(&gxfb_driver);
 522 }
 523
 524 static void __exit gxfb_cleanup(void)
 525 {
 526         pci_unregister_driver(&gxfb_driver);
 527 }
 528
 529 module_init(gxfb_init);
 530 module_exit(gxfb_cleanup);
 531
 532 module_param(mode_option, charp, 0);
 533 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 534
 535 module_param(vram, int, 0);
 536 MODULE_PARM_DESC(vram, "video memory size");
 537
 538 module_param(vt_switch, int, 0);
 539 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
 540
 541 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 542 MODULE_LICENSE("GPL");