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