drivers/video/geode/gx1fb_core.c

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