1/* 2 * linux/drivers/video/maxinefb.c 3 * 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 be 7 * found in the file hpfb.c in the same directory. 8 * 9 * DECstation related code Copyright (C) 1999,2000,2001 by 10 * Michael Engel <engel@unix-ag.org> and 11 * Karsten Merker <merker@linuxtag.org>. 12 * This file is subject to the terms and conditions of the GNU General 13 * Public License. See the file COPYING in the main directory of this 14 * archive for more details. 15 * 16 */ 17 18/* 19 * Changes: 20 * 2001/01/27 removed debugging and testing code, fixed fb_ops 21 * 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/slab.h> 32#include <linux/delay.h> 33#include <linux/init.h> 34#include <linux/fb.h> 35#include <video/maxinefb.h> 36 37/* bootinfo.h defines the machine type values, needed when checking */ 38/* whether are really running on a maxine, KM */ 39#include <asm/bootinfo.h> 40 41static struct fb_info fb_info; 42 43static struct fb_var_screeninfo maxinefb_defined = { 44 .xres = 1024, 45 .yres = 768, 46 .xres_virtual = 1024, 47 .yres_virtual = 768, 48 .bits_per_pixel =8, 49 .activate = FB_ACTIVATE_NOW, 50 .height = -1, 51 .width = -1, 52 .vmode = FB_VMODE_NONINTERLACED, 53}; 54 55static struct fb_fix_screeninfo maxinefb_fix = { 56 .id = "Maxine", 57 .smem_len = (1024*768), 58 .type = FB_TYPE_PACKED_PIXELS, 59 .visual = FB_VISUAL_PSEUDOCOLOR, 60 .line_length = 1024, 61}; 62 63/* Handle the funny Inmos RamDAC/video controller ... */ 64 65void maxinefb_ims332_write_register(int regno, register unsigned int val) 66{ 67 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS; 68 unsigned char *wptr; 69 70 wptr = regs + 0xa0000 + (regno << 4); 71 *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00; 72 *((volatile unsigned short *) (wptr)) = val; 73} 74 75unsigned int maxinefb_ims332_read_register(int regno) 76{ 77 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS; 78 unsigned char *rptr; 79 register unsigned int j, k; 80 81 rptr = regs + 0x80000 + (regno << 4); 82 j = *((volatile unsigned short *) rptr); 83 k = *((volatile unsigned short *) regs); 84 85 return (j & 0xffff) | ((k & 0xff00) << 8); 86} 87 88/* Set the palette */ 89static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green, 90 unsigned blue, unsigned transp, struct fb_info *info) 91{ 92 /* value to be written into the palette reg. */ 93 unsigned long hw_colorvalue = 0; 94 95 red >>= 8; /* The cmap fields are 16 bits */ 96 green >>= 8; /* wide, but the harware colormap */ 97 blue >>= 8; /* registers are only 8 bits wide */ 98 99 hw_colorvalue = (blue << 16) + (green << 8) + (red); 100 101 maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno, 102 hw_colorvalue); 103 return 0; 104} 105 106static struct fb_ops maxinefb_ops = { 107 .owner = THIS_MODULE, 108 .fb_setcolreg = maxinefb_setcolreg, 109 .fb_fillrect = cfb_fillrect, 110 .fb_copyarea = cfb_copyarea, 111 .fb_imageblit = cfb_imageblit, 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 else 148 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 fb_info.flags = FBINFO_DEFAULT; 157 158 fb_alloc_cmap(&fb_info.cmap, 256, 0); 159 160 if (register_framebuffer(&fb_info) < 0) 161 return 1; 162 return 0; 163} 164 165static void __exit maxinefb_exit(void) 166{ 167 unregister_framebuffer(&fb_info); 168} 169 170#ifdef MODULE 171MODULE_LICENSE("GPL"); 172#endif 173module_init(maxinefb_init); 174module_exit(maxinefb_exit); 175