linux/drivers/video/g364fb.c
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   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/vmalloc.h>
  24#include <linux/delay.h>
  25#include <linux/interrupt.h>
  26#include <linux/fb.h>
  27#include <linux/init.h>
  28#include <asm/io.h>
  29#include <asm/jazz.h>
  30
  31/* 
  32 * Various defines for the G364
  33 */
  34#define G364_MEM_BASE   0xe4400000
  35#define G364_PORT_BASE  0xe4000000
  36#define ID_REG          0xe4000000      /* Read only */
  37#define BOOT_REG        0xe4080000
  38#define TIMING_REG      0xe4080108      /* to 0x080170 - DON'T TOUCH! */
  39#define DISPLAY_REG     0xe4080118
  40#define VDISPLAY_REG    0xe4080150
  41#define MASK_REG        0xe4080200
  42#define CTLA_REG        0xe4080300
  43#define CURS_TOGGLE     0x800000
  44#define BIT_PER_PIX     0x700000        /* bits 22 to 20 of Control A */
  45#define DELAY_SAMPLE    0x080000
  46#define PORT_INTER      0x040000
  47#define PIX_PIPE_DEL    0x030000        /* bits 17 and 16 of Control A */
  48#define PIX_PIPE_DEL2   0x008000        /* same as above - don't ask me why */
  49#define TR_CYCLE_TOG    0x004000
  50#define VRAM_ADR_INC    0x003000        /* bits 13 and 12 of Control A */
  51#define BLANK_OFF       0x000800
  52#define FORCE_BLANK     0x000400
  53#define BLK_FUN_SWTCH   0x000200
  54#define BLANK_IO        0x000100
  55#define BLANK_LEVEL     0x000080
  56#define A_VID_FORM      0x000040
  57#define D_SYNC_FORM     0x000020
  58#define FRAME_FLY_PAT   0x000010
  59#define OP_MODE         0x000008
  60#define INTL_STAND      0x000004
  61#define SCRN_FORM       0x000002
  62#define ENABLE_VTG      0x000001
  63#define TOP_REG         0xe4080400
  64#define CURS_PAL_REG    0xe4080508      /* to 0x080518 */
  65#define CHKSUM_REG      0xe4080600      /* to 0x080610 - unused */
  66#define CURS_POS_REG    0xe4080638
  67#define CLR_PAL_REG     0xe4080800      /* to 0x080ff8 */
  68#define CURS_PAT_REG    0xe4081000      /* to 0x081ff8 */
  69#define MON_ID_REG      0xe4100000      /* unused */
  70#define RESET_REG       0xe4180000      /* Write only */
  71
  72static struct fb_info fb_info;
  73
  74static struct fb_fix_screeninfo fb_fix __initdata = {
  75        .id             = "G364 8plane",
  76        .smem_start     = 0x40000000,   /* physical address */
  77        .type           = FB_TYPE_PACKED_PIXELS,
  78        .visual         = FB_VISUAL_PSEUDOCOLOR,
  79        .ypanstep       = 1,
  80        .accel          = FB_ACCEL_NONE,
  81};
  82
  83static struct fb_var_screeninfo fb_var __initdata = {
  84        .bits_per_pixel = 8,
  85        .red            = { 0, 8, 0 },
  86        .green          = { 0, 8, 0 },
  87        .blue           = { 0, 8, 0 },
  88        .activate       = FB_ACTIVATE_NOW,
  89        .height         = -1,
  90        .width          = -1,
  91        .pixclock       = 39722,
  92        .left_margin    = 40,
  93        .right_margin   = 24,
  94        .upper_margin   = 32,
  95        .lower_margin   = 11,
  96        .hsync_len      = 96,
  97        .vsync_len      = 2,
  98        .vmode          = FB_VMODE_NONINTERLACED,
  99};
 100
 101/*
 102 *  Interface used by the world
 103 */
 104int g364fb_init(void);
 105
 106static int g364fb_pan_display(struct fb_var_screeninfo *var,
 107                              struct fb_info *info);
 108static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
 109                            u_int blue, u_int transp,
 110                            struct fb_info *info);
 111static int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor);
 112static int g364fb_blank(int blank, struct fb_info *info);
 113
 114static struct fb_ops g364fb_ops = {
 115        .owner          = THIS_MODULE,
 116        .fb_setcolreg   = g364fb_setcolreg,
 117        .fb_pan_display = g364fb_pan_display,
 118        .fb_blank       = g364fb_blank,
 119        .fb_fillrect    = cfb_fillrect,
 120        .fb_copyarea    = cfb_copyarea,
 121        .fb_imageblit   = cfb_imageblit,
 122        .fb_cursor      = g364fb_cursor,
 123};
 124
 125int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 126{
 127        
 128        switch (cursor->enable) {
 129        case CM_ERASE:
 130                *(unsigned int *) CTLA_REG |= CURS_TOGGLE;
 131                break;
 132
 133        case CM_MOVE:
 134        case CM_DRAW:
 135                *(unsigned int *) CTLA_REG &= ~CURS_TOGGLE;
 136                *(unsigned int *) CURS_POS_REG =
 137                    ((x * fontwidth(p)) << 12) | ((y * fontheight(p)) -
 138                                                  info->var.yoffset);
 139                break;
 140        }
 141        return 0;
 142}
 143
 144/*
 145 *  Pan or Wrap the Display
 146 *
 147 *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
 148 */
 149static int g364fb_pan_display(struct fb_var_screeninfo *var, 
 150                              struct fb_info *info)
 151{
 152        if (var->xoffset ||
 153            var->yoffset + info->var.yres > info->var.yres_virtual)
 154                return -EINVAL;
 155
 156        *(unsigned int *) TOP_REG = var->yoffset * info->var.xres;
 157        return 0;
 158}
 159
 160/*
 161 *  Blank the display.
 162 */
 163static 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 */
 175static 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 */
 195int __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
 254module_init(g364fb_init);
 255MODULE_LICENSE("GPL");
 256
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