linux/drivers/video/geode/gx1fb_core.c
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   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
  27static char mode_option[32] = "640x480-16@60";
  28static int  crt_option = 1;
  29static char panel_option[32] = "";
  30
  31/* Modes relevant to the GX1 (taken from modedb.c) */
  32static 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
  87static 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
 100static 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
 134static 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
 150static 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
 157static 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
 191static 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
 198static 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
 240static 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
 259static 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
 271static 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
 321static 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
 385static 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
 408static 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
 431static 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
 438MODULE_DEVICE_TABLE(pci, gx1fb_id_table);
 439
 440static struct pci_driver gx1fb_driver = {
 441        .name           = "gx1fb",
 442        .id_table       = gx1fb_id_table,
 443        .probe          = gx1fb_probe,
 444        .remove         = gx1fb_remove,
 445};
 446
 447static 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
 459static void __exit gx1fb_cleanup(void)
 460{
 461        pci_unregister_driver(&gx1fb_driver);
 462}
 463
 464module_init(gx1fb_init);
 465module_exit(gx1fb_cleanup);
 466
 467module_param_string(mode, mode_option, sizeof(mode_option), 0444);
 468MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 469
 470module_param_named(crt, crt_option, int, 0444);
 471MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");
 472
 473module_param_string(panel, panel_option, sizeof(panel_option), 0444);
 474MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");
 475
 476MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
 477MODULE_LICENSE("GPL");
 478