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_cursor(struct fb_info *info, struct fb_cursor *cursor); 112 static int g364fb_blank(int blank, struct fb_info *info); 113 114 static 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 }; 124 125 int 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 */ 149 static 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 */ 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"); 256