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