256 lines
6.8 KiB
C
256 lines
6.8 KiB
C
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/* $Id: g364fb.c,v 1.3 1998/08/28 22:43:00 tsbogend Exp $
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*
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* linux/drivers/video/g364fb.c -- Mips Magnum frame buffer device
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*
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* (C) 1998 Thomas Bogendoerfer
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*
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* This driver is based on tgafb.c
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*
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* Copyright (C) 1997 Geert Uytterhoeven
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* Copyright (C) 1995 Jay Estabrook
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <asm/jazz.h>
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/*
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* Various defines for the G364
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*/
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#define G364_MEM_BASE 0xe4400000
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#define G364_PORT_BASE 0xe4000000
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#define ID_REG 0xe4000000 /* Read only */
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#define BOOT_REG 0xe4080000
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#define TIMING_REG 0xe4080108 /* to 0x080170 - DON'T TOUCH! */
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#define DISPLAY_REG 0xe4080118
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#define VDISPLAY_REG 0xe4080150
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#define MASK_REG 0xe4080200
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#define CTLA_REG 0xe4080300
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#define CURS_TOGGLE 0x800000
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#define BIT_PER_PIX 0x700000 /* bits 22 to 20 of Control A */
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#define DELAY_SAMPLE 0x080000
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#define PORT_INTER 0x040000
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#define PIX_PIPE_DEL 0x030000 /* bits 17 and 16 of Control A */
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#define PIX_PIPE_DEL2 0x008000 /* same as above - don't ask me why */
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#define TR_CYCLE_TOG 0x004000
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#define VRAM_ADR_INC 0x003000 /* bits 13 and 12 of Control A */
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#define BLANK_OFF 0x000800
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#define FORCE_BLANK 0x000400
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#define BLK_FUN_SWTCH 0x000200
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#define BLANK_IO 0x000100
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#define BLANK_LEVEL 0x000080
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#define A_VID_FORM 0x000040
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#define D_SYNC_FORM 0x000020
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#define FRAME_FLY_PAT 0x000010
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#define OP_MODE 0x000008
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#define INTL_STAND 0x000004
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#define SCRN_FORM 0x000002
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#define ENABLE_VTG 0x000001
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#define TOP_REG 0xe4080400
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#define CURS_PAL_REG 0xe4080508 /* to 0x080518 */
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#define CHKSUM_REG 0xe4080600 /* to 0x080610 - unused */
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#define CURS_POS_REG 0xe4080638
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#define CLR_PAL_REG 0xe4080800 /* to 0x080ff8 */
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#define CURS_PAT_REG 0xe4081000 /* to 0x081ff8 */
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#define MON_ID_REG 0xe4100000 /* unused */
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#define RESET_REG 0xe4180000 /* Write only */
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static struct fb_info fb_info;
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static struct fb_fix_screeninfo fb_fix __initdata = {
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.id = "G364 8plane",
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.smem_start = 0x40000000, /* physical address */
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_PSEUDOCOLOR,
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.ypanstep = 1,
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.accel = FB_ACCEL_NONE,
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};
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static struct fb_var_screeninfo fb_var __initdata = {
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.bits_per_pixel = 8,
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.red = { 0, 8, 0 },
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.green = { 0, 8, 0 },
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.blue = { 0, 8, 0 },
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.activate = FB_ACTIVATE_NOW,
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.height = -1,
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.width = -1,
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.pixclock = 39722,
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.left_margin = 40,
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.right_margin = 24,
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.upper_margin = 32,
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.lower_margin = 11,
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.hsync_len = 96,
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.vsync_len = 2,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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/*
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* Interface used by the world
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*/
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int g364fb_init(void);
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static int g364fb_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info);
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static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
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u_int blue, u_int transp,
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struct fb_info *info);
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static int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor);
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static int g364fb_blank(int blank, struct fb_info *info);
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static struct fb_ops g364fb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = g364fb_setcolreg,
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.fb_pan_display = g364fb_pan_display,
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.fb_blank = g364fb_blank,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_cursor = g364fb_cursor,
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};
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int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
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{
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switch (cursor->enable) {
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case CM_ERASE:
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*(unsigned int *) CTLA_REG |= CURS_TOGGLE;
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break;
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case CM_MOVE:
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case CM_DRAW:
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*(unsigned int *) CTLA_REG &= ~CURS_TOGGLE;
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*(unsigned int *) CURS_POS_REG =
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((x * fontwidth(p)) << 12) | ((y * fontheight(p)) -
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info->var.yoffset);
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break;
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}
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return 0;
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}
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/*
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* Pan or Wrap the Display
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*
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* This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
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*/
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static int g364fb_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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if (var->xoffset ||
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var->yoffset + info->var.yres > info->var.yres_virtual)
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return -EINVAL;
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*(unsigned int *) TOP_REG = var->yoffset * info->var.xres;
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return 0;
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}
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/*
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* Blank the display.
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*/
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static int g364fb_blank(int blank, struct fb_info *info)
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{
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if (blank)
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*(unsigned int *) CTLA_REG |= FORCE_BLANK;
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else
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*(unsigned int *) CTLA_REG &= ~FORCE_BLANK;
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return 0;
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}
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/*
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* Set a single color register. Return != 0 for invalid regno.
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*/
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static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
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u_int blue, u_int transp, struct fb_info *info)
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{
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volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
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if (regno > 255)
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return 1;
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red >>= 8;
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green >>= 8;
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blue >>= 8;
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ptr[regno << 1] = (red << 16) | (green << 8) | blue;
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return 0;
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}
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/*
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* Initialisation
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*/
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int __init g364fb_init(void)
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{
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volatile unsigned int *pal_ptr =
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(volatile unsigned int *) CLR_PAL_REG;
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volatile unsigned int *curs_pal_ptr =
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(volatile unsigned int *) CURS_PAL_REG;
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int mem, i, j;
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if (fb_get_options("g364fb", NULL))
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return -ENODEV;
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/* TBD: G364 detection */
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/* get the resolution set by ARC console */
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*(volatile unsigned int *) CTLA_REG &= ~ENABLE_VTG;
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fb_var.xres =
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(*((volatile unsigned int *) DISPLAY_REG) & 0x00ffffff) * 4;
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fb_var.yres =
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(*((volatile unsigned int *) VDISPLAY_REG) & 0x00ffffff) / 2;
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*(volatile unsigned int *) CTLA_REG |= ENABLE_VTG;
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/* setup cursor */
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curs_pal_ptr[0] |= 0x00ffffff;
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curs_pal_ptr[2] |= 0x00ffffff;
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curs_pal_ptr[4] |= 0x00ffffff;
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/*
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* first set the whole cursor to transparent
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*/
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for (i = 0; i < 512; i++)
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*(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
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/*
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* switch the last two lines to cursor palette 3
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* we assume here, that FONTSIZE_X is 8
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*/
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*(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
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*(unsigned short *) (CURS_PAT_REG + 15 * 64) = 0xffff;
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fb_var.xres_virtual = fbvar.xres;
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fb_fix.line_length = (xres / 8) * fb_var.bits_per_pixel;
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fb_fix.smem_start = 0x40000000; /* physical address */
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/* get size of video memory; this is special for the JAZZ hardware */
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mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
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fb_fix.smem_len = (1 << (mem * 2)) * 512 * 1024;
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fb_var.yres_virtual = fb_fix.smem_len / fb_var.xres;
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fb_info.fbops = &g364fb_ops;
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fb_info.screen_base = (char *) G364_MEM_BASE; /* virtual kernel address */
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fb_info.var = fb_var;
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fb_info.fix = fb_fix;
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fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
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fb_alloc_cmap(&fb_info.cmap, 255, 0);
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if (register_framebuffer(&fb_info) < 0)
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return -EINVAL;
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return 0;
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}
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module_init(g364fb_init);
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MODULE_LICENSE("GPL");
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