drivers/video/fbdev/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/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
  72 static struct fb_info fb_info;
  73
  74 static 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
  83 static 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  */
 104 int g364fb_init(void);
 105
 106 static int g364fb_pan_display(struct fb_var_screeninfo *var,
 107                               struct fb_info *info);
 108 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
 109                             u_int blue, u_int transp,
 110                             struct fb_info *info);
 111 static int g364fb_blank(int blank, struct fb_info *info);
 112
 113 static const struct fb_ops g364fb_ops = {
 114         .owner          = THIS_MODULE,
 115         .fb_setcolreg   = g364fb_setcolreg,
 116         .fb_pan_display = g364fb_pan_display,
 117         .fb_blank       = g364fb_blank,
 118         .fb_fillrect    = cfb_fillrect,
 119         .fb_copyarea    = cfb_copyarea,
 120         .fb_imageblit   = cfb_imageblit,
 121 };
 122
 123 /*
 124  *  Pan or Wrap the Display
 125  *
 126  *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
 127  */
 128 static int g364fb_pan_display(struct fb_var_screeninfo *var,
 129                               struct fb_info *info)
 130 {
 131         if (var->xoffset ||
 132             var->yoffset + info->var.yres > info->var.yres_virtual)
 133                 return -EINVAL;
 134
 135         *(unsigned int *) TOP_REG = var->yoffset * info->var.xres;
 136         return 0;
 137 }
 138
 139 /*
 140  *  Blank the display.
 141  */
 142 static int g364fb_blank(int blank, struct fb_info *info)
 143 {
 144         if (blank)
 145                 *(unsigned int *) CTLA_REG |= FORCE_BLANK;
 146         else
 147                 *(unsigned int *) CTLA_REG &= ~FORCE_BLANK;
 148         return 0;
 149 }
 150
 151 /*
 152  *  Set a single color register. Return != 0 for invalid regno.
 153  */
 154 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
 155                             u_int blue, u_int transp, struct fb_info *info)
 156 {
 157         volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
 158
 159         if (regno > 255)
 160                 return 1;
 161
 162         red >>= 8;
 163         green >>= 8;
 164         blue >>= 8;
 165
 166         ptr[regno << 1] = (red << 16) | (green << 8) | blue;
 167
 168         return 0;
 169 }
 170
 171 /*
 172  *  Initialisation
 173  */
 174 int __init g364fb_init(void)
 175 {
 176         volatile unsigned int *curs_pal_ptr =
 177             (volatile unsigned int *) CURS_PAL_REG;
 178         int mem, i;
 179
 180         if (fb_get_options("g364fb", NULL))
 181                 return -ENODEV;
 182
 183         /* TBD: G364 detection */
 184
 185         /* get the resolution set by ARC console */
 186         *(volatile unsigned int *) CTLA_REG &= ~ENABLE_VTG;
 187         fb_var.xres =
 188             (*((volatile unsigned int *) DISPLAY_REG) & 0x00ffffff) * 4;
 189         fb_var.yres =
 190             (*((volatile unsigned int *) VDISPLAY_REG) & 0x00ffffff) / 2;
 191         *(volatile unsigned int *) CTLA_REG |= ENABLE_VTG;
 192
 193         /* setup cursor */
 194         curs_pal_ptr[0] |= 0x00ffffff;
 195         curs_pal_ptr[2] |= 0x00ffffff;
 196         curs_pal_ptr[4] |= 0x00ffffff;
 197
 198         /*
 199          * first set the whole cursor to transparent
 200          */
 201         for (i = 0; i < 512; i++)
 202                 *(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
 203
 204         /*
 205          * switch the last two lines to cursor palette 3
 206          * we assume here, that FONTSIZE_X is 8
 207          */
 208         *(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
 209         *(unsigned short *) (CURS_PAT_REG + 15 * 64) = 0xffff;
 210         fb_var.xres_virtual = fb_var.xres;
 211         fb_fix.line_length = fb_var.xres_virtual * fb_var.bits_per_pixel / 8;
 212         fb_fix.smem_start = 0x40000000; /* physical address */
 213         /* get size of video memory; this is special for the JAZZ hardware */
 214         mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
 215         fb_fix.smem_len = (1 << (mem * 2)) * 512 * 1024;
 216         fb_var.yres_virtual = fb_fix.smem_len / fb_var.xres;
 217
 218         fb_info.fbops = &g364fb_ops;
 219         fb_info.screen_base = (char *) G364_MEM_BASE;   /* virtual kernel address */
 220         fb_info.var = fb_var;
 221         fb_info.fix = fb_fix;
 222         fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 223
 224         fb_alloc_cmap(&fb_info.cmap, 255, 0);
 225
 226         if (register_framebuffer(&fb_info) < 0)
 227                 return -EINVAL;
 228         return 0;
 229 }
 230
 231 module_init(g364fb_init);
 232 MODULE_LICENSE("GPL");