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/slab.h>
  29 #include <linux/delay.h>
  30 #include <linux/fb.h>
  31 #include <linux/init.h>
  32 #include <linux/pci.h>
  33 #include <asm/geode.h>
  34
  35 #include "geodefb.h"
  36 #include "display_gx.h"
  37 #include "video_gx.h"
  38
  39 static char *mode_option;
  40 static int vram;
  41
  42 /* Modes relevant to the GX (taken from modedb.c) */
  43 static const struct fb_videomode gx_modedb[] __initdata = {
  44         /* 640x480-60 VESA */
  45         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
  46           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  47         /* 640x480-75 VESA */
  48         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
  49           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  50         /* 640x480-85 VESA */
  51         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
  52           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  53         /* 800x600-60 VESA */
  54         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
  55           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  56           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  57         /* 800x600-75 VESA */
  58         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
  59           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  60           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  61         /* 800x600-85 VESA */
  62         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
  63           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  64           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  65         /* 1024x768-60 VESA */
  66         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
  67           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  68         /* 1024x768-75 VESA */
  69         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
  70           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  71           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  72         /* 1024x768-85 VESA */
  73         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
  74           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  75           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  76         /* 1280x960-60 VESA */
  77         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
  78           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  79           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  80         /* 1280x960-85 VESA */
  81         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
  82           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  83           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  84         /* 1280x1024-60 VESA */
  85         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
  86           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  87           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  88         /* 1280x1024-75 VESA */
  89         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
  90           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  91           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  92         /* 1280x1024-85 VESA */
  93         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
  94           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  95           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
  96         /* 1600x1200-60 VESA */
  97         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
  98           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  99           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 100         /* 1600x1200-75 VESA */
 101         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 102           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 103           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 104         /* 1600x1200-85 VESA */
 105         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 106           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 107           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 108 };
 109
 110 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 111 {
 112         if (var->xres > 1600 || var->yres > 1200)
 113                 return -EINVAL;
 114         if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
 115                 return -EINVAL;
 116
 117         if (var->bits_per_pixel == 32) {
 118                 var->red.offset   = 16; var->red.length   = 8;
 119                 var->green.offset =  8; var->green.length = 8;
 120                 var->blue.offset  =  0; var->blue.length  = 8;
 121         } else if (var->bits_per_pixel == 16) {
 122                 var->red.offset   = 11; var->red.length   = 5;
 123                 var->green.offset =  5; var->green.length = 6;
 124                 var->blue.offset  =  0; var->blue.length  = 5;
 125         } else if (var->bits_per_pixel == 8) {
 126                 var->red.offset   = 0; var->red.length   = 8;
 127                 var->green.offset = 0; var->green.length = 8;
 128                 var->blue.offset  = 0; var->blue.length  = 8;
 129         } else
 130                 return -EINVAL;
 131         var->transp.offset = 0; var->transp.length = 0;
 132
 133         /* Enough video memory? */
 134         if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
 135                 return -EINVAL;
 136
 137         /* FIXME: Check timing parameters here? */
 138
 139         return 0;
 140 }
 141
 142 static int gxfb_set_par(struct fb_info *info)
 143 {
 144         struct geodefb_par *par = info->par;
 145
 146         if (info->var.bits_per_pixel > 8) {
 147                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 148                 fb_dealloc_cmap(&info->cmap);
 149         } else {
 150                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 151                 fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
 152         }
 153
 154         info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
 155
 156         par->dc_ops->set_mode(info);
 157
 158         return 0;
 159 }
 160
 161 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 162 {
 163         chan &= 0xffff;
 164         chan >>= 16 - bf->length;
 165         return chan << bf->offset;
 166 }
 167
 168 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 169                            unsigned blue, unsigned transp,
 170                            struct fb_info *info)
 171 {
 172         struct geodefb_par *par = info->par;
 173
 174         if (info->var.grayscale) {
 175                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 176                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 177         }
 178
 179         /* Truecolor has hardware independent palette */
 180         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 181                 u32 *pal = info->pseudo_palette;
 182                 u32 v;
 183
 184                 if (regno >= 16)
 185                         return -EINVAL;
 186
 187                 v  = chan_to_field(red, &info->var.red);
 188                 v |= chan_to_field(green, &info->var.green);
 189                 v |= chan_to_field(blue, &info->var.blue);
 190
 191                 pal[regno] = v;
 192         } else {
 193                 if (regno >= 256)
 194                         return -EINVAL;
 195
 196                 par->dc_ops->set_palette_reg(info, regno, red, green, blue);
 197         }
 198
 199         return 0;
 200 }
 201
 202 static int gxfb_blank(int blank_mode, struct fb_info *info)
 203 {
 204         struct geodefb_par *par = info->par;
 205
 206         return par->vid_ops->blank_display(info, blank_mode);
 207 }
 208
 209 static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 210 {
 211         struct geodefb_par *par = info->par;
 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
 237         info->fix.smem_start = pci_resource_start(dev, 0);
 238         info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
 239         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 240         if (!info->screen_base)
 241                 return -ENOMEM;
 242
 243         /* Set the 16MiB aligned base address of the graphics memory region
 244          * in the display controller */
 245
 246         writel(info->fix.smem_start & 0xFF000000,
 247                         par->dc_regs + DC_GLIU0_MEM_OFFSET);
 248
 249         dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
 250                  info->fix.smem_len / 1024, info->fix.smem_start);
 251
 252         return 0;
 253 }
 254
 255 static struct fb_ops gxfb_ops = {
 256         .owner          = THIS_MODULE,
 257         .fb_check_var   = gxfb_check_var,
 258         .fb_set_par     = gxfb_set_par,
 259         .fb_setcolreg   = gxfb_setcolreg,
 260         .fb_blank       = gxfb_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 * __init gxfb_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, "Geode GX");
 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             = &gxfb_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         return info;
 304 }
 305
 306 static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 307 {
 308         struct geodefb_par *par;
 309         struct fb_info *info;
 310         int ret;
 311         unsigned long val;
 312
 313         info = gxfb_init_fbinfo(&pdev->dev);
 314         if (!info)
 315                 return -ENOMEM;
 316         par = info->par;
 317
 318         /* GX display controller and GX video device. */
 319         par->dc_ops  = &gx_dc_ops;
 320         par->vid_ops = &gx_vid_ops;
 321
 322         if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
 323                 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
 324                 goto err;
 325         }
 326
 327         /* Figure out if this is a TFT or CRT part */
 328
 329         rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
 330
 331         if ((val & GLD_MSR_CONFIG_DM_FP) == GLD_MSR_CONFIG_DM_FP)
 332                 par->enable_crt = 0;
 333         else
 334                 par->enable_crt = 1;
 335
 336         ret = fb_find_mode(&info->var, info, mode_option,
 337                            gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
 338         if (ret == 0 || ret == 4) {
 339                 dev_err(&pdev->dev, "could not find valid video mode\n");
 340                 ret = -EINVAL;
 341                 goto err;
 342         }
 343
 344
 345         /* Clear the frame buffer of garbage. */
 346         memset_io(info->screen_base, 0, info->fix.smem_len);
 347
 348         gxfb_check_var(&info->var, info);
 349         gxfb_set_par(info);
 350
 351         if (register_framebuffer(info) < 0) {
 352                 ret = -EINVAL;
 353                 goto err;
 354         }
 355         pci_set_drvdata(pdev, info);
 356         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, 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, 3);
 367         }
 368         if (par->dc_regs) {
 369                 iounmap(par->dc_regs);
 370                 pci_release_region(pdev, 2);
 371         }
 372
 373         if (info)
 374                 framebuffer_release(info);
 375         return ret;
 376 }
 377
 378 static void gxfb_remove(struct pci_dev *pdev)
 379 {
 380         struct fb_info *info = pci_get_drvdata(pdev);
 381         struct geodefb_par *par = info->par;
 382
 383         unregister_framebuffer(info);
 384
 385         iounmap((void __iomem *)info->screen_base);
 386         pci_release_region(pdev, 0);
 387
 388         iounmap(par->vid_regs);
 389         pci_release_region(pdev, 3);
 390
 391         iounmap(par->dc_regs);
 392         pci_release_region(pdev, 2);
 393
 394         pci_set_drvdata(pdev, NULL);
 395
 396         framebuffer_release(info);
 397 }
 398
 399 static struct pci_device_id gxfb_id_table[] = {
 400         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
 401         { 0, }
 402 };
 403
 404 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
 405
 406 static struct pci_driver gxfb_driver = {
 407         .name           = "gxfb",
 408         .id_table       = gxfb_id_table,
 409         .probe          = gxfb_probe,
 410         .remove         = gxfb_remove,
 411 };
 412
 413 #ifndef MODULE
 414 static int __init gxfb_setup(char *options)
 415 {
 416
 417         char *opt;
 418
 419         if (!options || !*options)
 420                 return 0;
 421
 422         while ((opt = strsep(&options, ",")) != NULL) {
 423                 if (!*opt)
 424                         continue;
 425
 426                 mode_option = opt;
 427         }
 428
 429         return 0;
 430 }
 431 #endif
 432
 433 static int __init gxfb_init(void)
 434 {
 435 #ifndef MODULE
 436         char *option = NULL;
 437
 438         if (fb_get_options("gxfb", &option))
 439                 return -ENODEV;
 440
 441         gxfb_setup(option);
 442 #endif
 443         return pci_register_driver(&gxfb_driver);
 444 }
 445
 446 static void __exit gxfb_cleanup(void)
 447 {
 448         pci_unregister_driver(&gxfb_driver);
 449 }
 450
 451 module_init(gxfb_init);
 452 module_exit(gxfb_cleanup);
 453
 454 module_param(mode_option, charp, 0);
 455 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 456
 457 module_param(vram, int, 0);
 458 MODULE_PARM_DESC(vram, "video memory size");
 459
 460 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
 461 MODULE_LICENSE("GPL");