178 lines
4.6 KiB
C
178 lines
4.6 KiB
C
/*
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* linux/drivers/video/maxinefb.c
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*
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* DECstation 5000/xx onboard framebuffer support ... derived from:
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* "HP300 Topcat framebuffer support (derived from macfb of all things)
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* Phil Blundell <philb@gnu.org> 1998", the original code can be
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* found in the file hpfb.c in the same directory.
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*
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* DECstation related code Copyright (C) 1999,2000,2001 by
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* Michael Engel <engel@unix-ag.org> and
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* Karsten Merker <merker@linuxtag.org>.
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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*/
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/*
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* Changes:
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* 2001/01/27 removed debugging and testing code, fixed fb_ops
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* initialization which had caused a crash before,
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* general cleanup, first official release (KM)
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/fb.h>
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#include <video/maxinefb.h>
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/* bootinfo.h defines the machine type values, needed when checking */
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/* whether are really running on a maxine, KM */
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#include <asm/bootinfo.h>
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static struct fb_info fb_info;
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static const struct fb_var_screeninfo maxinefb_defined = {
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.xres = 1024,
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.yres = 768,
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.xres_virtual = 1024,
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.yres_virtual = 768,
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.bits_per_pixel =8,
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.activate = FB_ACTIVATE_NOW,
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.height = -1,
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.width = -1,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static struct fb_fix_screeninfo maxinefb_fix __initdata = {
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.id = "Maxine",
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.smem_len = (1024*768),
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_PSEUDOCOLOR,
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.line_length = 1024,
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};
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/* Handle the funny Inmos RamDAC/video controller ... */
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void maxinefb_ims332_write_register(int regno, register unsigned int val)
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{
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register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
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unsigned char *wptr;
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wptr = regs + 0xa0000 + (regno << 4);
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*((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
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*((volatile unsigned short *) (wptr)) = val;
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}
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unsigned int maxinefb_ims332_read_register(int regno)
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{
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register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
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unsigned char *rptr;
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register unsigned int j, k;
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rptr = regs + 0x80000 + (regno << 4);
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j = *((volatile unsigned short *) rptr);
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k = *((volatile unsigned short *) regs);
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return (j & 0xffff) | ((k & 0xff00) << 8);
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}
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/* Set the palette */
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static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
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unsigned blue, unsigned transp, struct fb_info *info)
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{
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/* value to be written into the palette reg. */
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unsigned long hw_colorvalue = 0;
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if (regno > 255)
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return 1;
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red >>= 8; /* The cmap fields are 16 bits */
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green >>= 8; /* wide, but the harware colormap */
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blue >>= 8; /* registers are only 8 bits wide */
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hw_colorvalue = (blue << 16) + (green << 8) + (red);
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maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
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hw_colorvalue);
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return 0;
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}
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static struct fb_ops maxinefb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = maxinefb_setcolreg,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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};
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int __init maxinefb_init(void)
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{
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unsigned long fboff;
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unsigned long fb_start;
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int i;
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if (fb_get_options("maxinefb", NULL))
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return -ENODEV;
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/* Validate we're on the proper machine type */
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if (mips_machtype != MACH_DS5000_XX) {
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return -EINVAL;
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}
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printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
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printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
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/* Framebuffer display memory base address */
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fb_start = DS5000_xx_ONBOARD_FBMEM_START;
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/* Clear screen */
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for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
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*(volatile unsigned char *)fboff = 0x0;
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maxinefb_fix.smem_start = fb_start;
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/* erase hardware cursor */
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for (i = 0; i < 512; i++) {
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maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
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0);
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/*
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if (i&0x8 == 0)
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maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
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else
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maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
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*/
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}
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fb_info.fbops = &maxinefb_ops;
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fb_info.screen_base = (char *)maxinefb_fix.smem_start;
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fb_info.var = maxinefb_defined;
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fb_info.fix = maxinefb_fix;
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fb_info.flags = FBINFO_DEFAULT;
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fb_alloc_cmap(&fb_info.cmap, 256, 0);
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if (register_framebuffer(&fb_info) < 0)
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return 1;
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return 0;
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}
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static void __exit maxinefb_exit(void)
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{
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unregister_framebuffer(&fb_info);
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}
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#ifdef MODULE
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MODULE_LICENSE("GPL");
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#endif
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module_init(maxinefb_init);
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module_exit(maxinefb_exit);
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