drivers/video/geode/gxfb_core.c

   1 /*
   2  * Geode GX framebuffer driver.
   3  *
   4  *   Copyright (C) 2006 Arcom Control Systems Ltd.
   5  *
   6  *   This program is free software; you can redistribute it and/or modify it
   7  *   under the terms of the GNU General Public License as published by the
   8  *   Free Software Foundation; either version 2 of the License, or (at your
   9  *   option) any later version.
  10  *
  11  *
  12  * This driver assumes that the BIOS has created a virtual PCI device header
  13  * for the video device. The PCI header is assumed to contain the following
  14  * BARs:
  15  *
  16  *    BAR0 - framebuffer memory
  17  *    BAR1 - graphics processor registers
  18  *    BAR2 - display controller registers
  19  *    BAR3 - video processor and flat panel control registers.
  20  *
  21  * 16 MiB of framebuffer memory is assumed to be available.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/string.h>
  27 #include <linux/mm.h>
  28 #include <linux/tty.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/fb.h>
  32 #include <linux/init.h>
  33 #include <linux/pci.h>
  34
  35 #include "geodefb.h"
  36 #include "display_gx.h"
  37 #include "video_gx.h"
  38
  39 static char mode_option[32] = "640x480-16@60";
  40
  41 /* Modes relevant to the GX (taken from modedb.c) */
  42 static const struct fb_videomode __initdata gx_modedb[] = {
  43         /* 640x480-60 VESA */
  44         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
  45           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  46         /* 640x480-75 VESA */
  47         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
  48           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  49         /* 640x480-85 VESA */
  50         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
  51           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  52         /* 800x600-60 VESA */
  53         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
  54           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  55           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  56         /* 800x600-75 VESA */
  57         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
  58           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  59           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  60         /* 800x600-85 VESA */
  61         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
  62           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  63           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  64         /* 1024x768-60 VESA */
  65         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
  66           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  67         /* 1024x768-75 VESA */
  68         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
  69           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  70           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  71         /* 1024x768-85 VESA */
  72         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
  73           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  74           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  75         /* 1280x960-60 VESA */
  76         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
  77           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  78           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  79         /* 1280x960-85 VESA */
  80         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
  81           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  82           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  83         /* 1280x1024-60 VESA */
  84         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
  85           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  86           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  87         /* 1280x1024-75 VESA */
  88         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
  89           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  90           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  91         /* 1280x1024-85 VESA */
  92         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
  93           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  94           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  95         /* 1600x1200-60 VESA */
  96         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
  97           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  98           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  99         /* 1600x1200-75 VESA */
 100         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 101           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 102           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 103         /* 1600x1200-85 VESA */
 104         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 105           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 106           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 107 };
 108
 109 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 110 {
 111         if (var->xres > 1600 || var->yres > 1200)
 112                 return -EINVAL;
 113         if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
 114                 return -EINVAL;
 115
 116         if (var->bits_per_pixel == 32) {
 117                 var->red.offset   = 16; var->red.length   = 8;
 118                 var->green.offset =  8; var->green.length = 8;
 119                 var->blue.offset  =  0; var->blue.length  = 8;
 120         } else if (var->bits_per_pixel == 16) {
 121                 var->red.offset   = 11; var->red.length   = 5;
 122                 var->green.offset =  5; var->green.length = 6;
 123                 var->blue.offset  =  0; var->blue.length  = 5;
 124         } else if (var->bits_per_pixel == 8) {
 125                 var->red.offset   = 0; var->red.length   = 8;
 126                 var->green.offset = 0; var->green.length = 8;
 127                 var->blue.offset  = 0; var->blue.length  = 8;
 128         } else
 129                 return -EINVAL;
 130         var->transp.offset = 0; var->transp.length = 0;
 131
 132         /* Enough video memory? */
 133         if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
 134                 return -EINVAL;
 135
 136         /* FIXME: Check timing parameters here? */
 137
 138         return 0;
 139 }
 140
 141 static int gxfb_set_par(struct fb_info *info)
 142 {
 143         struct geodefb_par *par = info->par;
 144
 145         if (info->var.bits_per_pixel > 8) {
 146                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 147                 fb_dealloc_cmap(&info->cmap);
 148         } else {
 149                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 150                 fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
 151         }
 152
 153         info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
 154
 155         par->dc_ops->set_mode(info);
 156
 157         return 0;
 158 }
 159
 160 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 161 {
 162         chan &= 0xffff;
 163         chan >>= 16 - bf->length;
 164         return chan << bf->offset;
 165 }
 166
 167 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 168                            unsigned blue, unsigned transp,
 169                            struct fb_info *info)
 170 {
 171         struct geodefb_par *par = info->par;
 172
 173         if (info->var.grayscale) {
 174                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 175                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 176         }
 177
 178         /* Truecolor has hardware independent palette */
 179         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 180                 u32 *pal = info->pseudo_palette;
 181                 u32 v;
 182
 183                 if (regno >= 16)
 184                         return -EINVAL;
 185
 186                 v  = chan_to_field(red, &info->var.red);
 187                 v |= chan_to_field(green, &info->var.green);
 188                 v |= chan_to_field(blue, &info->var.blue);
 189
 190                 pal[regno] = v;
 191         } else {
 192                 if (regno >= 256)
 193                         return -EINVAL;
 194
 195                 par->dc_ops->set_palette_reg(info, regno, red, green, blue);
 196         }
 197
 198         return 0;
 199 }
 200
 201 static int gxfb_blank(int blank_mode, struct fb_info *info)
 202 {
 203         struct geodefb_par *par = info->par;
 204
 205         return par->vid_ops->blank_display(info, blank_mode);
 206 }
 207
 208 static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 209 {
 210         struct geodefb_par *par = info->par;
 211         int fb_len;
 212         int ret;
 213
 214         ret = pci_enable_device(dev);
 215         if (ret < 0)
 216                 return ret;
 217
 218         ret = pci_request_region(dev, 3, "gxfb (video processor)");
 219         if (ret < 0)
 220                 return ret;
 221         par->vid_regs = ioremap(pci_resource_start(dev, 3),
 222                                 pci_resource_len(dev, 3));
 223         if (!par->vid_regs)
 224                 return -ENOMEM;
 225
 226         ret = pci_request_region(dev, 2, "gxfb (display controller)");
 227         if (ret < 0)
 228                 return ret;
 229         par->dc_regs = ioremap(pci_resource_start(dev, 2), pci_resource_len(dev, 2));
 230         if (!par->dc_regs)
 231                 return -ENOMEM;
 232
 233         ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
 234         if (ret < 0)
 235                 return ret;
 236         if ((fb_len = gx_frame_buffer_size()) < 0)
 237                 return -ENOMEM;
 238         info->fix.smem_start = pci_resource_start(dev, 0);
 239         info->fix.smem_len = fb_len;
 240         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 241         if (!info->screen_base)
 242                 return -ENOMEM;
 243
 244         dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
 245                  info->fix.smem_len / 1024, info->fix.smem_start);
 246
 247         return 0;
 248 }
 249
 250 static struct fb_ops gxfb_ops = {
 251         .owner          = THIS_MODULE,
 252         .fb_check_var   = gxfb_check_var,
 253         .fb_set_par     = gxfb_set_par,
 254         .fb_setcolreg   = gxfb_setcolreg,
 255         .fb_blank       = gxfb_blank,
 256         /* No HW acceleration for now. */
 257         .fb_fillrect    = cfb_fillrect,
 258         .fb_copyarea    = cfb_copyarea,
 259         .fb_imageblit   = cfb_imageblit,
 260 };
 261
 262 static struct fb_info * __init gxfb_init_fbinfo(struct device *dev)
 263 {
 264         struct geodefb_par *par;
 265         struct fb_info *info;
 266
 267         /* Alloc enough space for the pseudo palette. */
 268         info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev);
 269         if (!info)
 270                 return NULL;
 271
 272         par = info->par;
 273
 274         strcpy(info->fix.id, "Geode GX");
 275
 276         info->fix.type          = FB_TYPE_PACKED_PIXELS;
 277         info->fix.type_aux      = 0;
 278         info->fix.xpanstep      = 0;
 279         info->fix.ypanstep      = 0;
 280         info->fix.ywrapstep     = 0;
 281         info->fix.accel         = FB_ACCEL_NONE;
 282
 283         info->var.nonstd        = 0;
 284         info->var.activate      = FB_ACTIVATE_NOW;
 285         info->var.height        = -1;
 286         info->var.width = -1;
 287         info->var.accel_flags = 0;
 288         info->var.vmode = FB_VMODE_NONINTERLACED;
 289
 290         info->fbops             = &gxfb_ops;
 291         info->flags             = FBINFO_DEFAULT;
 292         info->node              = -1;
 293
 294         info->pseudo_palette    = (void *)par + sizeof(struct geodefb_par);
 295
 296         info->var.grayscale     = 0;
 297
 298         return info;
 299 }
 300
 301 static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 302 {
 303         struct geodefb_par *par;
 304         struct fb_info *info;
 305         int ret;
 306
 307         info = gxfb_init_fbinfo(&pdev->dev);
 308         if (!info)
 309                 return -ENOMEM;
 310         par = info->par;
 311
 312         /* GX display controller and GX video device. */
 313         par->dc_ops  = &gx_dc_ops;
 314         par->vid_ops = &gx_vid_ops;
 315
 316         if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
 317                 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
 318                 goto err;
 319         }
 320
 321         ret = fb_find_mode(&info->var, info, mode_option,
 322                            gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
 323         if (ret == 0 || ret == 4) {
 324                 dev_err(&pdev->dev, "could not find valid video mode\n");
 325                 ret = -EINVAL;
 326                 goto err;
 327         }
 328
 329         /* Clear the frame buffer of garbage. */
 330         memset_io(info->screen_base, 0, info->fix.smem_len);
 331
 332         gxfb_check_var(&info->var, info);
 333         gxfb_set_par(info);
 334
 335         if (register_framebuffer(info) < 0) {
 336                 ret = -EINVAL;
 337                 goto err;
 338         }
 339         pci_set_drvdata(pdev, info);
 340         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
 341         return 0;
 342
 343   err:
 344         if (info->screen_base) {
 345                 iounmap(info->screen_base);
 346                 pci_release_region(pdev, 0);
 347         }
 348         if (par->vid_regs) {
 349                 iounmap(par->vid_regs);
 350                 pci_release_region(pdev, 3);
 351         }
 352         if (par->dc_regs) {
 353                 iounmap(par->dc_regs);
 354                 pci_release_region(pdev, 2);
 355         }
 356
 357         pci_disable_device(pdev);
 358
 359         if (info)
 360                 framebuffer_release(info);
 361         return ret;
 362 }
 363
 364 static void gxfb_remove(struct pci_dev *pdev)
 365 {
 366         struct fb_info *info = pci_get_drvdata(pdev);
 367         struct geodefb_par *par = info->par;
 368
 369         unregister_framebuffer(info);
 370
 371         iounmap((void __iomem *)info->screen_base);
 372         pci_release_region(pdev, 0);
 373
 374         iounmap(par->vid_regs);
 375         pci_release_region(pdev, 3);
 376
 377         iounmap(par->dc_regs);
 378         pci_release_region(pdev, 2);
 379
 380         pci_disable_device(pdev);
 381         pci_set_drvdata(pdev, NULL);
 382
 383         framebuffer_release(info);
 384 }
 385
 386 static struct pci_device_id gxfb_id_table[] = {
 387         { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_VIDEO,
 388           PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
 389           0xff0000, 0 },
 390         { 0, }
 391 };
 392
 393 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
 394
 395 static struct pci_driver gxfb_driver = {
 396         .name           = "gxfb",
 397         .id_table       = gxfb_id_table,
 398         .probe          = gxfb_probe,
 399         .remove         = gxfb_remove,
 400 };
 401
 402 static int __init gxfb_init(void)
 403 {
 404 #ifndef MODULE
 405         if (fb_get_options("gxfb", NULL))
 406                 return -ENODEV;
 407 #endif
 408         return pci_register_driver(&gxfb_driver);
 409 }
 410
 411 static void __exit gxfb_cleanup(void)
 412 {
 413         pci_unregister_driver(&gxfb_driver);
 414 }
 415
 416 module_init(gxfb_init);
 417 module_exit(gxfb_cleanup);
 418
 419 module_param_string(mode, mode_option, sizeof(mode_option), 0444);
 420 MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 421
 422 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 423 MODULE_LICENSE("GPL");