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 static int gx1_line_delta(int xres, int bpp)
  34 {
  35         int line_delta = xres * (bpp >> 3);
  36
  37         if (line_delta > 2048)
  38                 line_delta = 4096;
  39         else if (line_delta > 1024)
  40                 line_delta = 2048;
  41         else
  42                 line_delta = 1024;
  43         return line_delta;
  44 }
  45
  46 static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
  47 {
  48         struct geodefb_par *par = info->par;
  49
  50         printk(KERN_DEBUG "%s()\n", __FUNCTION__);
  51
  52         /* Maximum resolution is 1280x1024. */
  53         if (var->xres > 1280 || var->yres > 1024)
  54                 return -EINVAL;
  55
  56         if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y))
  57                 return -EINVAL;
  58
  59         /* Only 16 bpp and 8 bpp is supported by the hardware. */
  60         if (var->bits_per_pixel == 16) {
  61                 var->red.offset   = 11; var->red.length   = 5;
  62                 var->green.offset =  5; var->green.length = 6;
  63                 var->blue.offset  =  0; var->blue.length  = 5;
  64                 var->transp.offset = 0; var->transp.length = 0;
  65         } else if (var->bits_per_pixel == 8) {
  66                 var->red.offset   = 0; var->red.length   = 8;
  67                 var->green.offset = 0; var->green.length = 8;
  68                 var->blue.offset  = 0; var->blue.length  = 8;
  69                 var->transp.offset = 0; var->transp.length = 0;
  70         } else
  71                 return -EINVAL;
  72
  73         /* Enough video memory? */
  74         if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
  75                 return -EINVAL;
  76
  77         /* FIXME: Check timing parameters here? */
  78
  79         return 0;
  80 }
  81
  82 static int gx1fb_set_par(struct fb_info *info)
  83 {
  84         struct geodefb_par *par = info->par;
  85
  86         if (info->var.bits_per_pixel == 16) {
  87                 info->fix.visual = FB_VISUAL_TRUECOLOR;
  88                 fb_dealloc_cmap(&info->cmap);
  89         } else {
  90                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  91                 fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
  92         }
  93
  94         info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel);
  95
  96         par->dc_ops->set_mode(info);
  97
  98         return 0;
  99 }
 100
 101 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 102 {
 103         chan &= 0xffff;
 104         chan >>= 16 - bf->length;
 105         return chan << bf->offset;
 106 }
 107
 108 static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 109                            unsigned blue, unsigned transp,
 110                            struct fb_info *info)
 111 {
 112         struct geodefb_par *par = info->par;
 113
 114         if (info->var.grayscale) {
 115                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 116                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 117         }
 118
 119         /* Truecolor has hardware independent palette */
 120         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 121                 u32 *pal = info->pseudo_palette;
 122                 u32 v;
 123
 124                 if (regno >= 16)
 125                         return -EINVAL;
 126
 127                 v  = chan_to_field(red, &info->var.red);
 128                 v |= chan_to_field(green, &info->var.green);
 129                 v |= chan_to_field(blue, &info->var.blue);
 130
 131                 pal[regno] = v;
 132         } else {
 133                 if (regno >= 256)
 134                         return -EINVAL;
 135
 136                 par->dc_ops->set_palette_reg(info, regno, red, green, blue);
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int gx1fb_blank(int blank_mode, struct fb_info *info)
 143 {
 144         struct geodefb_par *par = info->par;
 145
 146         return par->vid_ops->blank_display(info, blank_mode);
 147 }
 148
 149 static int __init gx1fb_map_video_memory(struct fb_info *info)
 150 {
 151         struct geodefb_par *par = info->par;
 152         unsigned gx_base;
 153         int fb_len;
 154
 155         gx_base = gx1_gx_base();
 156         if (!gx_base)
 157                 return -ENODEV;
 158
 159         par->vid_dev = pci_get_device(PCI_VENDOR_ID_CYRIX,
 160                                       PCI_DEVICE_ID_CYRIX_5530_VIDEO, NULL);
 161         if (!par->vid_dev)
 162                 return -ENODEV;
 163
 164         par->vid_regs = ioremap(pci_resource_start(par->vid_dev, 1),
 165                                 pci_resource_len(par->vid_dev, 1));
 166         if (!par->vid_regs)
 167                 return -ENOMEM;
 168
 169         par->dc_regs = ioremap(gx_base + 0x8300, 0x100);
 170         if (!par->dc_regs)
 171                 return -ENOMEM;
 172
 173         info->fix.smem_start = gx_base + 0x800000;
 174         if ((fb_len = gx1_frame_buffer_size()) < 0)
 175                 return -ENOMEM;
 176         info->fix.smem_len = fb_len;
 177         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 178         if (!info->screen_base)
 179                 return -ENOMEM;
 180
 181         printk(KERN_INFO "%s: %d Kibyte of video memory at 0x%lx\n",
 182                info->fix.id, info->fix.smem_len / 1024, info->fix.smem_start);
 183
 184         return 0;
 185 }
 186
 187 static int parse_panel_option(struct fb_info *info)
 188 {
 189         struct geodefb_par *par = info->par;
 190
 191         if (strcmp(panel_option, "") != 0) {
 192                 int x, y;
 193                 char *s;
 194                 x = simple_strtol(panel_option, &s, 10);
 195                 if (!x)
 196                         return -EINVAL;
 197                 y = simple_strtol(s + 1, NULL, 10);
 198                 if (!y)
 199                         return -EINVAL;
 200                 par->panel_x = x;
 201                 par->panel_y = y;
 202         }
 203         return 0;
 204 }
 205
 206 static struct fb_ops gx1fb_ops = {
 207         .owner          = THIS_MODULE,
 208         .fb_check_var   = gx1fb_check_var,
 209         .fb_set_par     = gx1fb_set_par,
 210         .fb_setcolreg   = gx1fb_setcolreg,
 211         .fb_blank       = gx1fb_blank,
 212         /* No HW acceleration for now. */
 213         .fb_fillrect    = cfb_fillrect,
 214         .fb_copyarea    = cfb_copyarea,
 215         .fb_imageblit   = cfb_imageblit,
 216         .fb_cursor      = soft_cursor,
 217 };
 218
 219 static struct fb_info * __init gx1fb_init_fbinfo(void)
 220 {
 221         struct fb_info *info;
 222         struct geodefb_par *par;
 223
 224         /* Alloc enough space for the pseudo palette. */
 225         info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, NULL);
 226         if (!info)
 227                 return NULL;
 228
 229         par = info->par;
 230
 231         strcpy(info->fix.id, "GX1");
 232
 233         info->fix.type          = FB_TYPE_PACKED_PIXELS;
 234         info->fix.type_aux      = 0;
 235         info->fix.xpanstep      = 0;
 236         info->fix.ypanstep      = 0;
 237         info->fix.ywrapstep     = 0;
 238         info->fix.accel         = FB_ACCEL_NONE;
 239
 240         info->var.nonstd        = 0;
 241         info->var.activate      = FB_ACTIVATE_NOW;
 242         info->var.height        = -1;
 243         info->var.width = -1;
 244         info->var.accel_flags = 0;
 245         info->var.vmode = FB_VMODE_NONINTERLACED;
 246
 247         info->fbops             = &gx1fb_ops;
 248         info->flags             = FBINFO_DEFAULT;
 249         info->node              = -1;
 250
 251         info->pseudo_palette    = (void *)par + sizeof(struct geodefb_par);
 252
 253         info->var.grayscale     = 0;
 254
 255         /* CRT and panel options */
 256         par->enable_crt = crt_option;
 257         if (parse_panel_option(info) < 0)
 258                 printk(KERN_WARNING "%s: invalid 'panel' option -- disabling flat panel\n",
 259                        info->fix.id);
 260         if (!par->panel_x)
 261                 par->enable_crt = 1; /* fall back to CRT if no panel is specified */
 262
 263         return info;
 264 }
 265
 266
 267 static struct fb_info *gx1fb_info;
 268
 269 static int __init gx1fb_init(void)
 270 {
 271         struct fb_info *info;
 272         struct geodefb_par *par;
 273         int ret;
 274
 275 #ifndef MODULE
 276         if (fb_get_options("gx1fb", NULL))
 277                 return -ENODEV;
 278 #endif
 279
 280         info = gx1fb_init_fbinfo();
 281         if (!info)
 282                 return -ENOMEM;
 283         gx1fb_info = info;
 284
 285         par = info->par;
 286
 287         /* GX1 display controller and CS5530 video device */
 288         par->dc_ops  = &gx1_dc_ops;
 289         par->vid_ops = &cs5530_vid_ops;
 290
 291         if ((ret = gx1fb_map_video_memory(info)) < 0) {
 292                 printk(KERN_ERR "%s: gx1fb_map_video_memory() failed\n", info->fix.id);
 293                 goto err;
 294         }
 295
 296         ret = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL, 16);
 297         if (ret == 0 || ret == 4) {
 298                 printk(KERN_ERR "%s: could not find valid video mode\n", info->fix.id);
 299                 ret = -EINVAL;
 300                 goto err;
 301         }
 302
 303         /* Clear the frame buffer of garbage. */
 304         memset_io(info->screen_base, 0, info->fix.smem_len);
 305
 306         gx1fb_check_var(&info->var, info);
 307         gx1fb_set_par(info);
 308
 309         if (register_framebuffer(info) < 0) {
 310                 ret = -EINVAL;
 311                 goto err;
 312         }
 313         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
 314         return 0;
 315
 316   err:
 317         if (info->screen_base)
 318                 iounmap(info->screen_base);
 319         if (par->vid_regs)
 320                 iounmap(par->vid_regs);
 321         if (par->dc_regs)
 322                 iounmap(par->dc_regs);
 323         if (par->vid_dev)
 324                 pci_dev_put(par->vid_dev);
 325         if (info)
 326                 framebuffer_release(info);
 327         return ret;
 328 }
 329
 330 static void __exit gx1fb_cleanup(void)
 331 {
 332         struct fb_info *info = gx1fb_info;
 333         struct geodefb_par *par = gx1fb_info->par;
 334
 335         unregister_framebuffer(info);
 336
 337         iounmap((void __iomem *)info->screen_base);
 338         iounmap(par->vid_regs);
 339         iounmap(par->dc_regs);
 340
 341         pci_dev_put(par->vid_dev);
 342
 343         framebuffer_release(info);
 344 }
 345
 346 module_init(gx1fb_init);
 347 module_exit(gx1fb_cleanup);
 348
 349 module_param_string(mode, mode_option, sizeof(mode_option), 0444);
 350 MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 351
 352 module_param_named(crt, crt_option, int, 0444);
 353 MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");
 354
 355 module_param_string(panel, panel_option, sizeof(panel_option), 0444);
 356 MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");
 357
 358 MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
 359 MODULE_LICENSE("GPL");