drivers/video/g364fb.c

   1 /* $Id: g364fb.c,v 1.3 1998/08/28 22:43:00 tsbogend Exp $
   2  *
   3  * linux/drivers/video/g364fb.c -- Mips Magnum frame buffer device
   4  *
   5  * (C) 1998 Thomas Bogendoerfer
   6  *
   7  *  This driver is based on tgafb.c
   8  *
   9  *      Copyright (C) 1997 Geert Uytterhoeven
  10  *      Copyright (C) 1995  Jay Estabrook
  11  *
  12  *  This file is subject to the terms and conditions of the GNU General Public
  13  *  License. See the file COPYING in the main directory of this archive for
  14  *  more details.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/console.h>
  19 #include <linux/kernel.h>
  20 #include <linux/errno.h>
  21 #include <linux/string.h>
  22 #include <linux/mm.h>
  23 #include <linux/slab.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/fb.h>
  28 #include <linux/init.h>
  29 #include <asm/io.h>
  30 #include <asm/jazz.h>
  31
  32 /*
  33  * Various defines for the G364
  34  */
  35 #define G364_MEM_BASE   0xe4400000
  36 #define G364_PORT_BASE  0xe4000000
  37 #define ID_REG          0xe4000000      /* Read only */
  38 #define BOOT_REG        0xe4080000
  39 #define TIMING_REG      0xe4080108      /* to 0x080170 - DON'T TOUCH! */
  40 #define DISPLAY_REG     0xe4080118
  41 #define VDISPLAY_REG    0xe4080150
  42 #define MASK_REG        0xe4080200
  43 #define CTLA_REG        0xe4080300
  44 #define CURS_TOGGLE     0x800000
  45 #define BIT_PER_PIX     0x700000        /* bits 22 to 20 of Control A */
  46 #define DELAY_SAMPLE    0x080000
  47 #define PORT_INTER      0x040000
  48 #define PIX_PIPE_DEL    0x030000        /* bits 17 and 16 of Control A */
  49 #define PIX_PIPE_DEL2   0x008000        /* same as above - don't ask me why */
  50 #define TR_CYCLE_TOG    0x004000
  51 #define VRAM_ADR_INC    0x003000        /* bits 13 and 12 of Control A */
  52 #define BLANK_OFF       0x000800
  53 #define FORCE_BLANK     0x000400
  54 #define BLK_FUN_SWTCH   0x000200
  55 #define BLANK_IO        0x000100
  56 #define BLANK_LEVEL     0x000080
  57 #define A_VID_FORM      0x000040
  58 #define D_SYNC_FORM     0x000020
  59 #define FRAME_FLY_PAT   0x000010
  60 #define OP_MODE         0x000008
  61 #define INTL_STAND      0x000004
  62 #define SCRN_FORM       0x000002
  63 #define ENABLE_VTG      0x000001
  64 #define TOP_REG         0xe4080400
  65 #define CURS_PAL_REG    0xe4080508      /* to 0x080518 */
  66 #define CHKSUM_REG      0xe4080600      /* to 0x080610 - unused */
  67 #define CURS_POS_REG    0xe4080638
  68 #define CLR_PAL_REG     0xe4080800      /* to 0x080ff8 */
  69 #define CURS_PAT_REG    0xe4081000      /* to 0x081ff8 */
  70 #define MON_ID_REG      0xe4100000      /* unused */
  71 #define RESET_REG       0xe4180000      /* Write only */
  72
  73 static struct fb_info fb_info;
  74
  75 static struct fb_fix_screeninfo fb_fix __initdata = {
  76         .id             = "G364 8plane",
  77         .smem_start     = 0x40000000,   /* physical address */
  78         .type           = FB_TYPE_PACKED_PIXELS,
  79         .visual         = FB_VISUAL_PSEUDOCOLOR,
  80         .ypanstep       = 1,
  81         .accel          = FB_ACCEL_NONE,
  82 };
  83
  84 static struct fb_var_screeninfo fb_var __initdata = {
  85         .bits_per_pixel = 8,
  86         .red            = { 0, 8, 0 },
  87         .green          = { 0, 8, 0 },
  88         .blue           = { 0, 8, 0 },
  89         .activate       = FB_ACTIVATE_NOW,
  90         .height         = -1,
  91         .width          = -1,
  92         .pixclock       = 39722,
  93         .left_margin    = 40,
  94         .right_margin   = 24,
  95         .upper_margin   = 32,
  96         .lower_margin   = 11,
  97         .hsync_len      = 96,
  98         .vsync_len      = 2,
  99         .vmode          = FB_VMODE_NONINTERLACED,
 100 };
 101
 102 /*
 103  *  Interface used by the world
 104  */
 105 int g364fb_init(void);
 106
 107 static int g364fb_pan_display(struct fb_var_screeninfo *var,
 108                               struct fb_info *info);
 109 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
 110                             u_int blue, u_int transp,
 111                             struct fb_info *info);
 112 static int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor);
 113 static int g364fb_blank(int blank, struct fb_info *info);
 114
 115 static struct fb_ops g364fb_ops = {
 116         .owner          = THIS_MODULE,
 117         .fb_setcolreg   = g364fb_setcolreg,
 118         .fb_pan_display = g364fb_pan_display,
 119         .fb_blank       = g364fb_blank,
 120         .fb_fillrect    = cfb_fillrect,
 121         .fb_copyarea    = cfb_copyarea,
 122         .fb_imageblit   = cfb_imageblit,
 123         .fb_cursor      = g364fb_cursor,
 124 };
 125
 126 int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 127 {
 128
 129         switch (cursor->enable) {
 130         case CM_ERASE:
 131                 *(unsigned int *) CTLA_REG |= CURS_TOGGLE;
 132                 break;
 133
 134         case CM_MOVE:
 135         case CM_DRAW:
 136                 *(unsigned int *) CTLA_REG &= ~CURS_TOGGLE;
 137                 *(unsigned int *) CURS_POS_REG =
 138                     ((x * fontwidth(p)) << 12) | ((y * fontheight(p)) -
 139                                                   info->var.yoffset);
 140                 break;
 141         }
 142         return 0;
 143 }
 144
 145 /*
 146  *  Pan or Wrap the Display
 147  *
 148  *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
 149  */
 150 static int g364fb_pan_display(struct fb_var_screeninfo *var,
 151                               struct fb_info *info)
 152 {
 153         if (var->xoffset || var->yoffset + var->yres > var->yres_virtual)
 154                 return -EINVAL;
 155
 156         *(unsigned int *) TOP_REG = var->yoffset * var->xres;
 157         return 0;
 158 }
 159
 160 /*
 161  *  Blank the display.
 162  */
 163 static int g364fb_blank(int blank, struct fb_info *info)
 164 {
 165         if (blank)
 166                 *(unsigned int *) CTLA_REG |= FORCE_BLANK;
 167         else
 168                 *(unsigned int *) CTLA_REG &= ~FORCE_BLANK;
 169         return 0;
 170 }
 171
 172 /*
 173  *  Set a single color register. Return != 0 for invalid regno.
 174  */
 175 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
 176                             u_int blue, u_int transp, struct fb_info *info)
 177 {
 178         volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
 179
 180         if (regno > 255)
 181                 return 1;
 182
 183         red >>= 8;
 184         green >>= 8;
 185         blue >>= 8;
 186
 187         ptr[regno << 1] = (red << 16) | (green << 8) | blue;
 188
 189         return 0;
 190 }
 191
 192 /*
 193  *  Initialisation
 194  */
 195 int __init g364fb_init(void)
 196 {
 197         volatile unsigned int *pal_ptr =
 198             (volatile unsigned int *) CLR_PAL_REG;
 199         volatile unsigned int *curs_pal_ptr =
 200             (volatile unsigned int *) CURS_PAL_REG;
 201         int mem, i, j;
 202
 203         if (fb_get_options("g364fb", NULL))
 204                 return -ENODEV;
 205
 206         /* TBD: G364 detection */
 207
 208         /* get the resolution set by ARC console */
 209         *(volatile unsigned int *) CTLA_REG &= ~ENABLE_VTG;
 210         fb_var.xres =
 211             (*((volatile unsigned int *) DISPLAY_REG) & 0x00ffffff) * 4;
 212         fb_var.yres =
 213             (*((volatile unsigned int *) VDISPLAY_REG) & 0x00ffffff) / 2;
 214         *(volatile unsigned int *) CTLA_REG |= ENABLE_VTG;
 215
 216         /* setup cursor */
 217         curs_pal_ptr[0] |= 0x00ffffff;
 218         curs_pal_ptr[2] |= 0x00ffffff;
 219         curs_pal_ptr[4] |= 0x00ffffff;
 220
 221         /*
 222          * first set the whole cursor to transparent
 223          */
 224         for (i = 0; i < 512; i++)
 225                 *(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
 226
 227         /*
 228          * switch the last two lines to cursor palette 3
 229          * we assume here, that FONTSIZE_X is 8
 230          */
 231         *(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
 232         *(unsigned short *) (CURS_PAT_REG + 15 * 64) = 0xffff;
 233         fb_var.xres_virtual = fbvar.xres;
 234         fb_fix.line_length = (xres / 8) * fb_var.bits_per_pixel;
 235         fb_fix.smem_start = 0x40000000; /* physical address */
 236         /* get size of video memory; this is special for the JAZZ hardware */
 237         mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
 238         fb_fix.smem_len = (1 << (mem * 2)) * 512 * 1024;
 239         fb_var.yres_virtual = fb_fix.smem_len / fb_var.xres;
 240
 241         fb_info.fbops = &g364fb_ops;
 242         fb_info.screen_base = (char *) G364_MEM_BASE;   /* virtual kernel address */
 243         fb_info.var = fb_var;
 244         fb_info.fix = fb_fix;
 245         fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 246
 247         fb_alloc_cmap(&fb_info.cmap, 255, 0);
 248
 249         if (register_framebuffer(&fb_info) < 0)
 250                 return -EINVAL;
 251         return 0;
 252 }
 253
 254 module_init(g364fb_init);
 255 MODULE_LICENSE("GPL");