231 lines · 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 device4 *5 * (C) 1998 Thomas Bogendoerfer6 *7 * This driver is based on tgafb.c8 *9 * Copyright (C) 1997 Geert Uytterhoeven10 * Copyright (C) 1995 Jay Estabrook11 *12 * This file is subject to the terms and conditions of the GNU General Public13 * License. See the file COPYING in the main directory of this archive for14 * 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 G36433 */34#define G364_MEM_BASE 0xe440000035#define G364_PORT_BASE 0xe400000036#define ID_REG 0xe4000000 /* Read only */37#define BOOT_REG 0xe408000038#define TIMING_REG 0xe4080108 /* to 0x080170 - DON'T TOUCH! */39#define DISPLAY_REG 0xe408011840#define VDISPLAY_REG 0xe408015041#define MASK_REG 0xe408020042#define CTLA_REG 0xe408030043#define CURS_TOGGLE 0x80000044#define BIT_PER_PIX 0x700000 /* bits 22 to 20 of Control A */45#define DELAY_SAMPLE 0x08000046#define PORT_INTER 0x04000047#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 0x00400050#define VRAM_ADR_INC 0x003000 /* bits 13 and 12 of Control A */51#define BLANK_OFF 0x00080052#define FORCE_BLANK 0x00040053#define BLK_FUN_SWTCH 0x00020054#define BLANK_IO 0x00010055#define BLANK_LEVEL 0x00008056#define A_VID_FORM 0x00004057#define D_SYNC_FORM 0x00002058#define FRAME_FLY_PAT 0x00001059#define OP_MODE 0x00000860#define INTL_STAND 0x00000461#define SCRN_FORM 0x00000262#define ENABLE_VTG 0x00000163#define TOP_REG 0xe408040064#define CURS_PAL_REG 0xe4080508 /* to 0x080518 */65#define CHKSUM_REG 0xe4080600 /* to 0x080610 - unused */66#define CURS_POS_REG 0xe408063867#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 world103 */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_blank(int blank, struct fb_info *info);112 113static 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 Display123 *124 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag125 */126static 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 */140static int g364fb_blank(int blank, struct fb_info *info)141{142 if (blank)143 *(unsigned int *) CTLA_REG |= FORCE_BLANK;144 else145 *(unsigned int *) CTLA_REG &= ~FORCE_BLANK;146 return 0;147}148 149/*150 * Set a single color register. Return != 0 for invalid regno.151 */152static 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 * Initialisation171 */172int __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 transparent198 */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 3204 * we assume here, that FONTSIZE_X is 8205 */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 229module_init(g364fb_init);230MODULE_LICENSE("GPL");231