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