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1/*2 * linux/drivers/video/maxinefb.c3 *4 * DECstation 5000/xx onboard framebuffer support ... derived from:5 * "HP300 Topcat framebuffer support (derived from macfb of all things)6 * Phil Blundell <philb@gnu.org> 1998", the original code can be7 * found in the file hpfb.c in the same directory.8 *9 * DECstation related code Copyright (C) 1999,2000,2001 by10 * Michael Engel <engel@unix-ag.org> and11 * Karsten Merker <merker@linuxtag.org>.12 * This file is subject to the terms and conditions of the GNU General13 * Public License. See the file COPYING in the main directory of this14 * archive for more details.15 *16 */17 18/*19 * Changes:20 * 2001/01/27 removed debugging and testing code, fixed fb_ops21 * initialization which had caused a crash before,22 * general cleanup, first official release (KM)23 *24 */25 26#include <linux/module.h>27#include <linux/kernel.h>28#include <linux/errno.h>29#include <linux/string.h>30#include <linux/mm.h>31#include <linux/delay.h>32#include <linux/init.h>33#include <linux/fb.h>34#include <video/maxinefb.h>35 36/* bootinfo.h defines the machine type values, needed when checking */37/* whether are really running on a maxine, KM */38#include <asm/bootinfo.h>39 40static struct fb_info fb_info;41 42static const struct fb_var_screeninfo maxinefb_defined = {43 .xres = 1024,44 .yres = 768,45 .xres_virtual = 1024,46 .yres_virtual = 768,47 .bits_per_pixel =8,48 .activate = FB_ACTIVATE_NOW,49 .height = -1,50 .width = -1,51 .vmode = FB_VMODE_NONINTERLACED,52};53 54static struct fb_fix_screeninfo maxinefb_fix __initdata = {55 .id = "Maxine",56 .smem_len = (1024*768),57 .type = FB_TYPE_PACKED_PIXELS,58 .visual = FB_VISUAL_PSEUDOCOLOR,59 .line_length = 1024,60};61 62/* Handle the funny Inmos RamDAC/video controller ... */63 64void maxinefb_ims332_write_register(int regno, register unsigned int val)65{66 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;67 unsigned char *wptr;68 69 wptr = regs + 0xa0000 + (regno << 4);70 *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;71 *((volatile unsigned short *) (wptr)) = val;72}73 74unsigned int maxinefb_ims332_read_register(int regno)75{76 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;77 unsigned char *rptr;78 register unsigned int j, k;79 80 rptr = regs + 0x80000 + (regno << 4);81 j = *((volatile unsigned short *) rptr);82 k = *((volatile unsigned short *) regs);83 84 return (j & 0xffff) | ((k & 0xff00) << 8);85}86 87/* Set the palette */88static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,89 unsigned blue, unsigned transp, struct fb_info *info)90{91 /* value to be written into the palette reg. */92 unsigned long hw_colorvalue = 0;93 94 if (regno > 255)95 return 1;96 97 red >>= 8; /* The cmap fields are 16 bits */98 green >>= 8; /* wide, but the harware colormap */99 blue >>= 8; /* registers are only 8 bits wide */100 101 hw_colorvalue = (blue << 16) + (green << 8) + (red);102 103 maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,104 hw_colorvalue);105 return 0;106}107 108static const struct fb_ops maxinefb_ops = {109 .owner = THIS_MODULE,110 FB_DEFAULT_IOMEM_OPS,111 .fb_setcolreg = maxinefb_setcolreg,112};113 114int __init maxinefb_init(void)115{116 unsigned long fboff;117 unsigned long fb_start;118 int i;119 120 if (fb_get_options("maxinefb", NULL))121 return -ENODEV;122 123 /* Validate we're on the proper machine type */124 if (mips_machtype != MACH_DS5000_XX) {125 return -EINVAL;126 }127 128 printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");129 printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");130 131 /* Framebuffer display memory base address */132 fb_start = DS5000_xx_ONBOARD_FBMEM_START;133 134 /* Clear screen */135 for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)136 *(volatile unsigned char *)fboff = 0x0;137 138 maxinefb_fix.smem_start = fb_start;139 140 /* erase hardware cursor */141 for (i = 0; i < 512; i++) {142 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,143 0);144 /*145 if (i&0x8 == 0)146 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);147 else148 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);149 */150 }151 152 fb_info.fbops = &maxinefb_ops;153 fb_info.screen_base = (char *)maxinefb_fix.smem_start;154 fb_info.var = maxinefb_defined;155 fb_info.fix = maxinefb_fix;156 157 fb_alloc_cmap(&fb_info.cmap, 256, 0);158 159 if (register_framebuffer(&fb_info) < 0)160 return 1;161 return 0;162}163 164static void __exit maxinefb_exit(void)165{166 unregister_framebuffer(&fb_info);167}168 169#ifdef MODULE170MODULE_LICENSE("GPL");171#endif172module_init(maxinefb_init);173module_exit(maxinefb_exit);174 175