drivers/video/fbdev/geode/gx1fb_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/video/geode/gx1fb_core.c
   4  *   -- Geode GX1 framebuffer driver
   5  *
   6  * Copyright (C) 2005 Arcom Control Systems Ltd.
   7  */
   8
   9 #include <linux/aperture.h>
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/string.h>
  14 #include <linux/mm.h>
  15 #include <linux/delay.h>
  16 #include <linux/fb.h>
  17 #include <linux/init.h>
  18 #include <linux/pci.h>
  19
  20 #include "geodefb.h"
  21 #include "display_gx1.h"
  22 #include "video_cs5530.h"
  23
  24 static char mode_option[32] = "640x480-16@60";
  25 static int  crt_option = 1;
  26 static char panel_option[32] = "";
  27
  28 /* Modes relevant to the GX1 (taken from modedb.c) */
  29 static const struct fb_videomode gx1_modedb[] = {
  30         /* 640x480-60 VESA */
  31         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
  32           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  33         /* 640x480-75 VESA */
  34         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
  35           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  36         /* 640x480-85 VESA */
  37         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
  38           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  39         /* 800x600-60 VESA */
  40         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
  41           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  42           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  43         /* 800x600-75 VESA */
  44         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
  45           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  46           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  47         /* 800x600-85 VESA */
  48         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
  49           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  50           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  51         /* 1024x768-60 VESA */
  52         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
  53           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  54         /* 1024x768-75 VESA */
  55         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
  56           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  57           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  58         /* 1024x768-85 VESA */
  59         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
  60           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  61           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  62         /* 1280x960-60 VESA */
  63         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
  64           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  65           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  66         /* 1280x960-85 VESA */
  67         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
  68           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  69           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  70         /* 1280x1024-60 VESA */
  71         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
  72           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  73           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  74         /* 1280x1024-75 VESA */
  75         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
  76           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  77           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  78         /* 1280x1024-85 VESA */
  79         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
  80           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  81           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  82 };
  83
  84 static int gx1_line_delta(int xres, int bpp)
  85 {
  86         int line_delta = xres * (bpp >> 3);
  87
  88         if (line_delta > 2048)
  89                 line_delta = 4096;
  90         else if (line_delta > 1024)
  91                 line_delta = 2048;
  92         else
  93                 line_delta = 1024;
  94         return line_delta;
  95 }
  96
  97 static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
  98 {
  99         struct geodefb_par *par = info->par;
 100
 101         /* Maximum resolution is 1280x1024. */
 102         if (var->xres > 1280 || var->yres > 1024)
 103                 return -EINVAL;
 104
 105         if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y))
 106                 return -EINVAL;
 107
 108         /* Only 16 bpp and 8 bpp is supported by the hardware. */
 109         if (var->bits_per_pixel == 16) {
 110                 var->red.offset   = 11; var->red.length   = 5;
 111                 var->green.offset =  5; var->green.length = 6;
 112                 var->blue.offset  =  0; var->blue.length  = 5;
 113                 var->transp.offset = 0; var->transp.length = 0;
 114         } else if (var->bits_per_pixel == 8) {
 115                 var->red.offset   = 0; var->red.length   = 8;
 116                 var->green.offset = 0; var->green.length = 8;
 117                 var->blue.offset  = 0; var->blue.length  = 8;
 118                 var->transp.offset = 0; var->transp.length = 0;
 119         } else
 120                 return -EINVAL;
 121
 122         /* Enough video memory? */
 123         if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
 124                 return -EINVAL;
 125
 126         /* FIXME: Check timing parameters here? */
 127
 128         return 0;
 129 }
 130
 131 static int gx1fb_set_par(struct fb_info *info)
 132 {
 133         struct geodefb_par *par = info->par;
 134
 135         if (info->var.bits_per_pixel == 16)
 136                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 137         else
 138                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 139
 140         info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel);
 141
 142         par->dc_ops->set_mode(info);
 143
 144         return 0;
 145 }
 146
 147 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 148 {
 149         chan &= 0xffff;
 150         chan >>= 16 - bf->length;
 151         return chan << bf->offset;
 152 }
 153
 154 static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 155                            unsigned blue, unsigned transp,
 156                            struct fb_info *info)
 157 {
 158         struct geodefb_par *par = info->par;
 159
 160         if (info->var.grayscale) {
 161                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 162                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 163         }
 164
 165         /* Truecolor has hardware independent palette */
 166         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 167                 u32 *pal = info->pseudo_palette;
 168                 u32 v;
 169
 170                 if (regno >= 16)
 171                         return -EINVAL;
 172
 173                 v  = chan_to_field(red, &info->var.red);
 174                 v |= chan_to_field(green, &info->var.green);
 175                 v |= chan_to_field(blue, &info->var.blue);
 176
 177                 pal[regno] = v;
 178         } else {
 179                 if (regno >= 256)
 180                         return -EINVAL;
 181
 182                 par->dc_ops->set_palette_reg(info, regno, red, green, blue);
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int gx1fb_blank(int blank_mode, struct fb_info *info)
 189 {
 190         struct geodefb_par *par = info->par;
 191
 192         return par->vid_ops->blank_display(info, blank_mode);
 193 }
 194
 195 static int gx1fb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 196 {
 197         struct geodefb_par *par = info->par;
 198         unsigned gx_base;
 199         int fb_len;
 200         int ret;
 201
 202         gx_base = gx1_gx_base();
 203         if (!gx_base)
 204                 return -ENODEV;
 205
 206         ret = pci_enable_device(dev);
 207         if (ret < 0)
 208                 return ret;
 209
 210         ret = pci_request_region(dev, 0, "gx1fb (video)");
 211         if (ret < 0)
 212                 return ret;
 213         par->vid_regs = pci_ioremap_bar(dev, 0);
 214         if (!par->vid_regs)
 215                 return -ENOMEM;
 216
 217         if (!request_mem_region(gx_base + 0x8300, 0x100, "gx1fb (display controller)"))
 218                 return -EBUSY;
 219         par->dc_regs = ioremap(gx_base + 0x8300, 0x100);
 220         if (!par->dc_regs)
 221                 return -ENOMEM;
 222
 223         if ((fb_len = gx1_frame_buffer_size()) < 0)
 224                 return -ENOMEM;
 225         info->fix.smem_start = gx_base + 0x800000;
 226         info->fix.smem_len = fb_len;
 227         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 228         if (!info->screen_base)
 229                 return -ENOMEM;
 230
 231         dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
 232                  info->fix.smem_len / 1024, info->fix.smem_start);
 233
 234         return 0;
 235 }
 236
 237 static int parse_panel_option(struct fb_info *info)
 238 {
 239         struct geodefb_par *par = info->par;
 240
 241         if (strcmp(panel_option, "") != 0) {
 242                 int x, y;
 243                 char *s;
 244                 x = simple_strtol(panel_option, &s, 10);
 245                 if (!x)
 246                         return -EINVAL;
 247                 y = simple_strtol(s + 1, NULL, 10);
 248                 if (!y)
 249                         return -EINVAL;
 250                 par->panel_x = x;
 251                 par->panel_y = y;
 252         }
 253         return 0;
 254 }
 255
 256 static const struct fb_ops gx1fb_ops = {
 257         .owner          = THIS_MODULE,
 258         FB_DEFAULT_IOMEM_OPS,
 259         .fb_check_var   = gx1fb_check_var,
 260         .fb_set_par     = gx1fb_set_par,
 261         .fb_setcolreg   = gx1fb_setcolreg,
 262         .fb_blank       = gx1fb_blank,
 263 };
 264
 265 static struct fb_info *gx1fb_init_fbinfo(struct device *dev)
 266 {
 267         struct geodefb_par *par;
 268         struct fb_info *info;
 269
 270         /* Alloc enough space for the pseudo palette. */
 271         info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev);
 272         if (!info)
 273                 return NULL;
 274
 275         par = info->par;
 276
 277         strcpy(info->fix.id, "GX1");
 278
 279         info->fix.type          = FB_TYPE_PACKED_PIXELS;
 280         info->fix.type_aux      = 0;
 281         info->fix.xpanstep      = 0;
 282         info->fix.ypanstep      = 0;
 283         info->fix.ywrapstep     = 0;
 284         info->fix.accel         = FB_ACCEL_NONE;
 285
 286         info->var.nonstd        = 0;
 287         info->var.activate      = FB_ACTIVATE_NOW;
 288         info->var.height        = -1;
 289         info->var.width = -1;
 290         info->var.accel_flags = 0;
 291         info->var.vmode = FB_VMODE_NONINTERLACED;
 292
 293         info->fbops             = &gx1fb_ops;
 294         info->node              = -1;
 295
 296         info->pseudo_palette    = (void *)par + sizeof(struct geodefb_par);
 297
 298         info->var.grayscale     = 0;
 299
 300         /* CRT and panel options */
 301         par->enable_crt = crt_option;
 302         if (parse_panel_option(info) < 0)
 303                 printk(KERN_WARNING "gx1fb: invalid 'panel' option -- disabling flat panel\n");
 304         if (!par->panel_x)
 305                 par->enable_crt = 1; /* fall back to CRT if no panel is specified */
 306
 307         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 308                 framebuffer_release(info);
 309                 return NULL;
 310         }
 311         return info;
 312 }
 313
 314 static int gx1fb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 315 {
 316         struct geodefb_par *par;
 317         struct fb_info *info;
 318         int ret;
 319
 320         ret = aperture_remove_conflicting_pci_devices(pdev, "gx1fb");
 321         if (ret)
 322                 return ret;
 323
 324         info = gx1fb_init_fbinfo(&pdev->dev);
 325         if (!info)
 326                 return -ENOMEM;
 327         par = info->par;
 328
 329         /* GX1 display controller and CS5530 video device */
 330         par->dc_ops  = &gx1_dc_ops;
 331         par->vid_ops = &cs5530_vid_ops;
 332
 333         if ((ret = gx1fb_map_video_memory(info, pdev)) < 0) {
 334                 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
 335                 goto err;
 336         }
 337
 338         ret = fb_find_mode(&info->var, info, mode_option,
 339                            gx1_modedb, ARRAY_SIZE(gx1_modedb), NULL, 16);
 340         if (ret == 0 || ret == 4) {
 341                 dev_err(&pdev->dev, "could not find valid video mode\n");
 342                 ret = -EINVAL;
 343                 goto err;
 344         }
 345
 346         /* Clear the frame buffer of garbage. */
 347         memset_io(info->screen_base, 0, info->fix.smem_len);
 348
 349         gx1fb_check_var(&info->var, info);
 350         gx1fb_set_par(info);
 351
 352         if (register_framebuffer(info) < 0) {
 353                 ret = -EINVAL;
 354                 goto err;
 355         }
 356         pci_set_drvdata(pdev, info);
 357         fb_info(info, "%s frame buffer device\n", info->fix.id);
 358         return 0;
 359
 360   err:
 361         if (info->screen_base) {
 362                 iounmap(info->screen_base);
 363                 pci_release_region(pdev, 0);
 364         }
 365         if (par->vid_regs) {
 366                 iounmap(par->vid_regs);
 367                 pci_release_region(pdev, 1);
 368         }
 369         if (par->dc_regs) {
 370                 iounmap(par->dc_regs);
 371                 release_mem_region(gx1_gx_base() + 0x8300, 0x100);
 372         }
 373
 374         fb_dealloc_cmap(&info->cmap);
 375         framebuffer_release(info);
 376
 377         return ret;
 378 }
 379
 380 static void gx1fb_remove(struct pci_dev *pdev)
 381 {
 382         struct fb_info *info = pci_get_drvdata(pdev);
 383         struct geodefb_par *par = info->par;
 384
 385         unregister_framebuffer(info);
 386
 387         iounmap((void __iomem *)info->screen_base);
 388         pci_release_region(pdev, 0);
 389
 390         iounmap(par->vid_regs);
 391         pci_release_region(pdev, 1);
 392
 393         iounmap(par->dc_regs);
 394         release_mem_region(gx1_gx_base() + 0x8300, 0x100);
 395
 396         fb_dealloc_cmap(&info->cmap);
 397
 398         framebuffer_release(info);
 399 }
 400
 401 #ifndef MODULE
 402 static void __init gx1fb_setup(char *options)
 403 {
 404         char *this_opt;
 405
 406         if (!options || !*options)
 407                 return;
 408
 409         while ((this_opt = strsep(&options, ","))) {
 410                 if (!*this_opt)
 411                         continue;
 412
 413                 if (!strncmp(this_opt, "mode:", 5))
 414                         strscpy(mode_option, this_opt + 5, sizeof(mode_option));
 415                 else if (!strncmp(this_opt, "crt:", 4))
 416                         crt_option = !!simple_strtoul(this_opt + 4, NULL, 0);
 417                 else if (!strncmp(this_opt, "panel:", 6))
 418                         strscpy(panel_option, this_opt + 6, sizeof(panel_option));
 419                 else
 420                         strscpy(mode_option, this_opt, sizeof(mode_option));
 421         }
 422 }
 423 #endif
 424
 425 static struct pci_device_id gx1fb_id_table[] = {
 426         { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_VIDEO,
 427           PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
 428           0xff0000, 0 },
 429         { 0, }
 430 };
 431
 432 MODULE_DEVICE_TABLE(pci, gx1fb_id_table);
 433
 434 static struct pci_driver gx1fb_driver = {
 435         .name           = "gx1fb",
 436         .id_table       = gx1fb_id_table,
 437         .probe          = gx1fb_probe,
 438         .remove         = gx1fb_remove,
 439 };
 440
 441 static int __init gx1fb_init(void)
 442 {
 443 #ifndef MODULE
 444         char *option = NULL;
 445 #endif
 446
 447         if (fb_modesetting_disabled("gx1fb"))
 448                 return -ENODEV;
 449
 450 #ifndef MODULE
 451         if (fb_get_options("gx1fb", &option))
 452                 return -ENODEV;
 453         gx1fb_setup(option);
 454 #endif
 455         return pci_register_driver(&gx1fb_driver);
 456 }
 457
 458 static void gx1fb_cleanup(void)
 459 {
 460         pci_unregister_driver(&gx1fb_driver);
 461 }
 462
 463 module_init(gx1fb_init);
 464 module_exit(gx1fb_cleanup);
 465
 466 module_param_string(mode, mode_option, sizeof(mode_option), 0444);
 467 MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 468
 469 module_param_named(crt, crt_option, int, 0444);
 470 MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");
 471
 472 module_param_string(panel, panel_option, sizeof(panel_option), 0444);
 473 MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");
 474
 475 MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
 476 MODULE_LICENSE("GPL");