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