drivers/video/tx3912fb.c

   1 /*
   2  *  drivers/video/tx3912fb.c
   3  *
   4  *  Copyright (C) 1999 Harald Koerfgen
   5  *  Copyright (C) 2001 Steven Hill (sjhill@realitydiluted.com)
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License. See the file COPYING in the main directory of this archive for
   9  * more details.
  10  *
  11  *  Framebuffer for LCD controller in TMPR3912/05 and PR31700 processors
  12  */
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/string.h>
  17 #include <linux/tty.h>
  18 #include <linux/delay.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/init.h>
  21 #include <linux/pm.h>
  22 #include <linux/fb.h>
  23 #include <asm/io.h>
  24 #include <asm/bootinfo.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/tx3912.h>
  27 #include <video/tx3912.h>
  28
  29 /*
  30  * Frame buffer, palette and console structures
  31  */
  32 static struct fb_info fb_info;
  33 static u32 cfb8[16];
  34
  35 static struct fb_fix_screeninfo tx3912fb_fix __initdata = {
  36         .id =           "tx3912fb",
  37         .smem_len =     ((240 * 320)/2),
  38         .type =         FB_TYPE_PACKED_PIXELS,
  39         .visual =       FB_VISUAL_TRUECOLOR,
  40         .xpanstep =     1,
  41         .ypanstep =     1,
  42         .ywrapstep =    1,
  43         .accel =        FB_ACCEL_NONE,
  44 };
  45
  46 static struct fb_var_screeninfo tx3912fb_var = {
  47         .xres =         240,
  48         .yres =         320,
  49         .xres_virtual = 240,
  50         .yres_virtual = 320,
  51         .bits_per_pixel =4,
  52         .red =          { 0, 4, 0 },    /* ??? */
  53         .green =        { 0, 4, 0 },
  54         .blue =         { 0, 4, 0 },
  55         .activate =     FB_ACTIVATE_NOW,
  56         .width =        -1,
  57         .height =       -1,
  58         .pixclock =     20000,
  59         .left_margin =  64,
  60         .right_margin = 64,
  61         .upper_margin = 32,
  62         .lower_margin = 32,
  63         .hsync_len =    64,
  64         .vsync_len =    2,
  65         .vmode =        FB_VMODE_NONINTERLACED,
  66 };
  67
  68 /*
  69  * Interface used by the world
  70  */
  71 int tx3912fb_init(void);
  72
  73 static int tx3912fb_setcolreg(u_int regno, u_int red, u_int green,
  74                               u_int blue, u_int transp,
  75                               struct fb_info *info);
  76
  77 /*
  78  * Macros
  79  */
  80 #define get_line_length(xres_virtual, bpp) \
  81                 (u_long) (((int) xres_virtual * (int) bpp + 7) >> 3)
  82
  83 /*
  84  * Frame buffer operations structure used by console driver
  85  */
  86 static struct fb_ops tx3912fb_ops = {
  87         .owner          = THIS_MODULE,
  88         .fb_setcolreg   = tx3912fb_setcolreg,
  89         .fb_fillrect    = cfb_fillrect,
  90         .fb_copyarea    = cfb_copyarea,
  91         .fb_imageblit   = cfb_imageblit,
  92         .fb_cursor      = soft_cursor,
  93 };
  94
  95 static int tx3912fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
  96 {
  97         /*
  98          * Memory limit
  99          */
 100         line_length =
 101             get_line_length(var->xres_virtual, var->bits_per_pixel);
 102         if ((line_length * var->yres_virtual) > info->fix.smem_len)
 103                 return -ENOMEM;
 104
 105         return 0;
 106 }
 107
 108 static int tx3912fb_set_par(struct fb_info *info)
 109 {
 110         u_long tx3912fb_paddr = 0;
 111
 112         /* Disable the video logic */
 113         outl(inl(TX3912_VIDEO_CTRL1) &
 114              ~(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
 115              TX3912_VIDEO_CTRL1);
 116         udelay(200);
 117
 118         /* Set start address for DMA transfer */
 119         outl(tx3912fb_paddr, TX3912_VIDEO_CTRL3);
 120
 121         /* Set end address for DMA transfer */
 122         outl((tx3912fb_paddr + tx3912fb_fix.smem_len + 1), TX3912_VIDEO_CTRL4);
 123
 124         /* Set the pixel depth */
 125         switch (info->var.bits_per_pixel) {
 126         case 1:
 127                 /* Monochrome */
 128                 outl(inl(TX3912_VIDEO_CTRL1) &
 129                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 130                 info->fix.visual = FB_VISUAL_MONO10;
 131                 break;
 132         case 4:
 133                 /* 4-bit gray */
 134                 outl(inl(TX3912_VIDEO_CTRL1) &
 135                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 136                 outl(inl(TX3912_VIDEO_CTRL1) |
 137                      TX3912_VIDEO_CTRL1_BITSEL_4BIT_GRAY,
 138                      TX3912_VIDEO_CTRL1);
 139                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 140                 break;
 141         case 8:
 142                 /* 8-bit color */
 143                 outl(inl(TX3912_VIDEO_CTRL1) &
 144                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 145                 outl(inl(TX3912_VIDEO_CTRL1) |
 146                      TX3912_VIDEO_CTRL1_BITSEL_8BIT_COLOR,
 147                      TX3912_VIDEO_CTRL1);
 148                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 149                 break;
 150         case 2:
 151         default:
 152                 /* 2-bit gray */
 153                 outl(inl(TX3912_VIDEO_CTRL1) &
 154                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 155                 outl(inl(TX3912_VIDEO_CTRL1) |
 156                      TX3912_VIDEO_CTRL1_BITSEL_2BIT_GRAY,
 157                      TX3912_VIDEO_CTRL1);
 158                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 159                 break;
 160         }
 161
 162         /* Enable the video clock */
 163         outl(inl(TX3912_CLK_CTRL) | TX3912_CLK_CTRL_ENVIDCLK,
 164              TX3912_CLK_CTRL);
 165
 166         /* Unfreeze video logic and enable DF toggle */
 167         outl(inl(TX3912_VIDEO_CTRL1) &
 168              ~(TX3912_VIDEO_CTRL1_ENFREEZEFRAME |
 169                TX3912_VIDEO_CTRL1_DFMODE)
 170              , TX3912_VIDEO_CTRL1);
 171         udelay(200);
 172
 173         /* Enable the video logic */
 174         outl(inl(TX3912_VIDEO_CTRL1) |
 175              (TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
 176              TX3912_VIDEO_CTRL1);
 177
 178         info->fix.line_length = get_line_length(var->xres_virtual,
 179                                             var->bits_per_pixel);
 180 }
 181
 182 /*
 183  * Set a single color register
 184  */
 185 static int tx3912fb_setcolreg(u_int regno, u_int red, u_int green,
 186                               u_int blue, u_int transp,
 187                               struct fb_info *info)
 188 {
 189         if (regno > 255)
 190                 return 1;
 191
 192         if (regno < 16)
 193                 ((u32 *)(info->pseudo_palette))[regno] = ((red & 0xe000) >> 8)
 194                     | ((green & 0xe000) >> 11)
 195                     | ((blue & 0xc000) >> 14);
 196         return 0;
 197 }
 198
 199 int __init tx3912fb_setup(char *options);
 200
 201 /*
 202  * Initialization of the framebuffer
 203  */
 204 int __init tx3912fb_init(void)
 205 {
 206         u_long tx3912fb_paddr = 0;
 207         int size = (info->var.bits_per_pixel == 8) ? 256 : 16;
 208         char *option = NULL;
 209
 210         if (fb_get_options("tx3912fb", &option))
 211                 return -ENODEV;
 212         tx3912fb_setup(option);
 213
 214         /* Disable the video logic */
 215         outl(inl(TX3912_VIDEO_CTRL1) &
 216              ~(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
 217              TX3912_VIDEO_CTRL1);
 218         udelay(200);
 219
 220         /* Set start address for DMA transfer */
 221         outl(tx3912fb_paddr, TX3912_VIDEO_CTRL3);
 222
 223         /* Set end address for DMA transfer */
 224         outl((tx3912fb_paddr + tx3912fb_fix.smem_len + 1), TX3912_VIDEO_CTRL4);
 225
 226         /* Set the pixel depth */
 227         switch (tx3912fb_var.bits_per_pixel) {
 228         case 1:
 229                 /* Monochrome */
 230                 outl(inl(TX3912_VIDEO_CTRL1) &
 231                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 232                 tx3912fb_fix.visual = FB_VISUAL_MONO10;
 233                 break;
 234         case 4:
 235                 /* 4-bit gray */
 236                 outl(inl(TX3912_VIDEO_CTRL1) &
 237                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 238                 outl(inl(TX3912_VIDEO_CTRL1) |
 239                      TX3912_VIDEO_CTRL1_BITSEL_4BIT_GRAY,
 240                      TX3912_VIDEO_CTRL1);
 241                 tx3912fb_fix.visual = FB_VISUAL_TRUECOLOR;
 242                 tx3912fb_fix.grayscale = 1;
 243                 break;
 244         case 8:
 245                 /* 8-bit color */
 246                 outl(inl(TX3912_VIDEO_CTRL1) &
 247                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 248                 outl(inl(TX3912_VIDEO_CTRL1) |
 249                      TX3912_VIDEO_CTRL1_BITSEL_8BIT_COLOR,
 250                      TX3912_VIDEO_CTRL1);
 251                 tx3912fb_fix.visual = FB_VISUAL_TRUECOLOR;
 252                 break;
 253         case 2:
 254         default:
 255                 /* 2-bit gray */
 256                 outl(inl(TX3912_VIDEO_CTRL1) &
 257                      ~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
 258                 outl(inl(TX3912_VIDEO_CTRL1) |
 259                      TX3912_VIDEO_CTRL1_BITSEL_2BIT_GRAY,
 260                      TX3912_VIDEO_CTRL1);
 261                 tx3912fb_fix.visual = FB_VISUAL_PSEUDOCOLOR;
 262                 tx3912fb_fix.grayscale = 1;
 263                 break;
 264         }
 265
 266         /* Enable the video clock */
 267         outl(inl(TX3912_CLK_CTRL) | TX3912_CLK_CTRL_ENVIDCLK,
 268                 TX3912_CLK_CTRL);
 269
 270         /* Unfreeze video logic and enable DF toggle */
 271         outl(inl(TX3912_VIDEO_CTRL1) &
 272                 ~(TX3912_VIDEO_CTRL1_ENFREEZEFRAME | TX3912_VIDEO_CTRL1_DFMODE),
 273                 TX3912_VIDEO_CTRL1);
 274         udelay(200);
 275
 276         /* Clear the framebuffer */
 277         memset((void *) tx3912fb_fix.smem_start, 0xff, tx3912fb_fix.smem_len);
 278         udelay(200);
 279
 280         /* Enable the video logic */
 281         outl(inl(TX3912_VIDEO_CTRL1) |
 282                 (TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
 283                 TX3912_VIDEO_CTRL1);
 284
 285         /*
 286          * Memory limit
 287          */
 288         tx3912fb_fix.line_length =
 289             get_line_length(tx3912fb_var.xres_virtual, tx3912fb_var.bits_per_pixel);
 290         if ((tx3912fb_fix.line_length * tx3912fb_var.yres_virtual) > tx3912fb_fix.smem_len)
 291                 return -ENOMEM;
 292
 293         fb_info.fbops = &tx3912fb_ops;
 294         fb_info.var = tx3912fb_var;
 295         fb_info.fix = tx3912fb_fix;
 296         fb_info.pseudo_palette = pseudo_palette;
 297         fb_info.flags = FBINFO_DEFAULT;
 298
 299         /* Clear the framebuffer */
 300         memset((void *) fb_info.fix.smem_start, 0xff, fb_info.fix.smem_len);
 301         udelay(200);
 302
 303         fb_alloc_cmap(&info->cmap, size, 0);
 304
 305         if (register_framebuffer(&fb_info) < 0)
 306                 return -1;
 307
 308         printk(KERN_INFO "fb%d: TX3912 frame buffer using %uKB.\n",
 309                fb_info.node, (u_int) (fb_info.fix.smem_len >> 10));
 310         return 0;
 311 }
 312
 313 int __init tx3912fb_setup(char *options)
 314 {
 315         char *this_opt;
 316
 317         if (!options || !*options)
 318                 return 0;
 319
 320         while ((this_opt = strsep(&options, ","))) {
 321                 if (!strncmp(options, "bpp:", 4))
 322                         tx3912fb_var.bits_per_pixel = simple_strtoul(options+4, NULL, 0);
 323         }
 324         return 0;
 325 }
 326
 327 module_init(tx3912fb_init);
 328 MODULE_LICENSE("GPL");