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