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177 lines
4.6 KiB
177 lines
4.6 KiB
/* |
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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 <[email protected]> 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 <[email protected]> and |
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* Karsten Merker <[email protected]>. |
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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 const 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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