video/fbdev/maxinefb.c

0001 /*
0002  *      linux/drivers/video/maxinefb.c
0003  *
0004  *  DECstation 5000/xx onboard framebuffer support ... derived from:
0005  *  "HP300 Topcat framebuffer support (derived from macfb of all things)
0006  *  Phil Blundell <philb@gnu.org> 1998", the original code can be
0007  *      found in the file hpfb.c in the same directory.
0008  *
0009  *      DECstation related code Copyright (C) 1999,2000,2001 by
0010  *      Michael Engel <engel@unix-ag.org> and
0011  *      Karsten Merker <merker@linuxtag.org>.
0012  *      This file is subject to the terms and conditions of the GNU General
0013  *      Public License.  See the file COPYING in the main directory of this
0014  *      archive for more details.
0015  *
0016  */
0017
0018 /*
0019  * Changes:
0020  * 2001/01/27 removed debugging and testing code, fixed fb_ops
0021  *            initialization which had caused a crash before,
0022  *            general cleanup, first official release (KM)
0023  *
0024  */
0025
0026 #include <linux/module.h>
0027 #include <linux/kernel.h>
0028 #include <linux/errno.h>
0029 #include <linux/string.h>
0030 #include <linux/mm.h>
0031 #include <linux/delay.h>
0032 #include <linux/init.h>
0033 #include <linux/fb.h>
0034 #include <video/maxinefb.h>
0035
0036 /* bootinfo.h defines the machine type values, needed when checking */
0037 /* whether are really running on a maxine, KM                       */
0038 #include <asm/bootinfo.h>
0039
0040 static struct fb_info fb_info;
0041
0042 static const struct fb_var_screeninfo maxinefb_defined = {
0043     .xres =     1024,
0044     .yres =     768,
0045     .xres_virtual = 1024,
0046     .yres_virtual = 768,
0047     .bits_per_pixel =8,
0048     .activate = FB_ACTIVATE_NOW,
0049     .height =   -1,
0050     .width =    -1,
0051     .vmode =    FB_VMODE_NONINTERLACED,
0052 };
0053
0054 static struct fb_fix_screeninfo maxinefb_fix __initdata = {
0055     .id =       "Maxine",
0056     .smem_len = (1024*768),
0057     .type =     FB_TYPE_PACKED_PIXELS,
0058     .visual =   FB_VISUAL_PSEUDOCOLOR,
0059     .line_length =  1024,
0060 };
0061
0062 /* Handle the funny Inmos RamDAC/video controller ... */
0063
0064 void maxinefb_ims332_write_register(int regno, register unsigned int val)
0065 {
0066     register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
0067     unsigned char *wptr;
0068
0069     wptr = regs + 0xa0000 + (regno << 4);
0070     *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
0071     *((volatile unsigned short *) (wptr)) = val;
0072 }
0073
0074 unsigned int maxinefb_ims332_read_register(int regno)
0075 {
0076     register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
0077     unsigned char *rptr;
0078     register unsigned int j, k;
0079
0080     rptr = regs + 0x80000 + (regno << 4);
0081     j = *((volatile unsigned short *) rptr);
0082     k = *((volatile unsigned short *) regs);
0083
0084     return (j & 0xffff) | ((k & 0xff00) << 8);
0085 }
0086
0087 /* Set the palette */
0088 static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
0089                   unsigned blue, unsigned transp, struct fb_info *info)
0090 {
0091     /* value to be written into the palette reg. */
0092     unsigned long hw_colorvalue = 0;
0093
0094     if (regno > 255)
0095         return 1;
0096
0097     red   >>= 8;    /* The cmap fields are 16 bits    */
0098     green >>= 8;    /* wide, but the harware colormap */
0099     blue  >>= 8;    /* registers are only 8 bits wide */
0100
0101     hw_colorvalue = (blue << 16) + (green << 8) + (red);
0102
0103     maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
0104                        hw_colorvalue);
0105     return 0;
0106 }
0107
0108 static const struct fb_ops maxinefb_ops = {
0109     .owner      = THIS_MODULE,
0110     .fb_setcolreg   = maxinefb_setcolreg,
0111     .fb_fillrect    = cfb_fillrect,
0112     .fb_copyarea    = cfb_copyarea,
0113     .fb_imageblit   = cfb_imageblit,
0114 };
0115
0116 int __init maxinefb_init(void)
0117 {
0118     unsigned long fboff;
0119     unsigned long fb_start;
0120     int i;
0121
0122     if (fb_get_options("maxinefb", NULL))
0123         return -ENODEV;
0124
0125     /* Validate we're on the proper machine type */
0126     if (mips_machtype != MACH_DS5000_XX) {
0127         return -EINVAL;
0128     }
0129
0130     printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
0131     printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
0132
0133     /* Framebuffer display memory base address */
0134     fb_start = DS5000_xx_ONBOARD_FBMEM_START;
0135
0136     /* Clear screen */
0137     for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
0138         *(volatile unsigned char *)fboff = 0x0;
0139
0140     maxinefb_fix.smem_start = fb_start;
0141
0142     /* erase hardware cursor */
0143     for (i = 0; i < 512; i++) {
0144         maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
0145                            0);
0146         /*
0147            if (i&0x8 == 0)
0148            maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
0149            else
0150            maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
0151          */
0152     }
0153
0154     fb_info.fbops = &maxinefb_ops;
0155     fb_info.screen_base = (char *)maxinefb_fix.smem_start;
0156     fb_info.var = maxinefb_defined;
0157     fb_info.fix = maxinefb_fix;
0158     fb_info.flags = FBINFO_DEFAULT;
0159
0160     fb_alloc_cmap(&fb_info.cmap, 256, 0);
0161
0162     if (register_framebuffer(&fb_info) < 0)
0163         return 1;
0164     return 0;
0165 }
0166
0167 static void __exit maxinefb_exit(void)
0168 {
0169     unregister_framebuffer(&fb_info);
0170 }
0171
0172 #ifdef MODULE
0173 MODULE_LICENSE("GPL");
0174 #endif
0175 module_init(maxinefb_init);
0176 module_exit(maxinefb_exit);
0177