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