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/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 40 static struct fb_info fb_info; 41 42 static 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 54 static 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 64 void 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 74 unsigned 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 */ 88 static 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 } 107 108 static const struct fb_ops maxinefb_ops = { 109 .owner = THIS_MODULE, 110 .fb_setcolreg = maxinefb_setcolreg, 111 .fb_fillrect = cfb_fillrect, 112 .fb_copyarea = cfb_copyarea, 113 .fb_imageblit = cfb_imageblit, 114 }; 115 116 int __init maxinefb_init(void) 117 { 118 unsigned long fboff; 119 unsigned long fb_start; 120 int i; 121 122 if (fb_get_options("maxinefb", NULL)) 123 return -ENODEV; 124 125 /* Validate we're on the proper machine type */ 126 if (mips_machtype != MACH_DS5000_XX) { 127 return -EINVAL; 128 } 129 130 printk(KERN_INFO "Maxinefb: Personal DECstation detected\n"); 131 printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n"); 132 133 /* Framebuffer display memory base address */ 134 fb_start = DS5000_xx_ONBOARD_FBMEM_START; 135 136 /* Clear screen */ 137 for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++) 138 *(volatile unsigned char *)fboff = 0x0; 139 140 maxinefb_fix.smem_start = fb_start; 141 142 /* erase hardware cursor */ 143 for (i = 0; i < 512; i++) { 144 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i, 145 0); 146 /* 147 if (i&0x8 == 0) 148 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f); 149 else 150 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0); 151 */ 152 } 153 154 fb_info.fbops = &maxinefb_ops; 155 fb_info.screen_base = (char *)maxinefb_fix.smem_start; 156 fb_info.var = maxinefb_defined; 157 fb_info.fix = maxinefb_fix; 158 fb_info.flags = FBINFO_DEFAULT; 159 160 fb_alloc_cmap(&fb_info.cmap, 256, 0); 161 162 if (register_framebuffer(&fb_info) < 0) 163 return 1; 164 return 0; 165 } 166 167 static void __exit maxinefb_exit(void) 168 { 169 unregister_framebuffer(&fb_info); 170 } 171 172 #ifdef MODULE 173 MODULE_LICENSE("GPL"); 174 #endif 175 module_init(maxinefb_init); 176 module_exit(maxinefb_exit); 177 178