blob: 743e7ad26acc3299f32e5903b9c4bc474a249fcb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/sched.h>
29#include <linux/errno.h>
30#include <linux/string.h>
31#include <linux/mm.h>
32#include <linux/tty.h>
33#include <linux/slab.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/fb.h>
37#include <video/maxinefb.h>
38
39/* bootinfo.h defines the machine type values, needed when checking */
40/* whether are really running on a maxine, KM */
41#include <asm/bootinfo.h>
42
43static struct fb_info fb_info;
44
45static struct fb_var_screeninfo maxinefb_defined = {
46 .xres = 1024,
47 .yres = 768,
48 .xres_virtual = 1024,
49 .yres_virtual = 768,
50 .bits_per_pixel =8,
51 .activate = FB_ACTIVATE_NOW,
52 .height = -1,
53 .width = -1,
54 .vmode = FB_VMODE_NONINTERLACED,
55};
56
57static struct fb_fix_screeninfo maxinefb_fix = {
58 .id = "Maxine onboard graphics 1024x768x8",
59 .smem_len = (1024*768),
60 .type = FB_TYPE_PACKED_PIXELS,
61 .visual = FB_VISUAL_PSEUDOCOLOR,
62 .line_length = 1024,
63};
64
65/* Handle the funny Inmos RamDAC/video controller ... */
66
67void maxinefb_ims332_write_register(int regno, register unsigned int val)
68{
69 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
70 unsigned char *wptr;
71
72 wptr = regs + 0xa0000 + (regno << 4);
73 *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
74 *((volatile unsigned short *) (wptr)) = val;
75}
76
77unsigned int maxinefb_ims332_read_register(int regno)
78{
79 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
80 unsigned char *rptr;
81 register unsigned int j, k;
82
83 rptr = regs + 0x80000 + (regno << 4);
84 j = *((volatile unsigned short *) rptr);
85 k = *((volatile unsigned short *) regs);
86
87 return (j & 0xffff) | ((k & 0xff00) << 8);
88}
89
90/* Set the palette */
91static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
92 unsigned blue, unsigned transp, struct fb_info *info)
93{
94 /* value to be written into the palette reg. */
95 unsigned long hw_colorvalue = 0;
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
108static struct fb_ops maxinefb_ops = {
109 .owner = THIS_MODULE,
110 .fb_get_fix = gen_get_fix,
111 .fb_get_var = gen_get_var,
112 .fb_setcolreg = maxinefb_setcolreg,
113 .fb_fillrect = cfb_fillrect,
114 .fb_copyarea = cfb_copyarea,
115 .fb_imageblit = cfb_imageblit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116};
117
118int __init maxinefb_init(void)
119{
120 unsigned long fboff;
121 unsigned long fb_start;
122 int i;
123
124 if (fb_get_options("maxinefb", NULL))
125 return -ENODEV;
126
127 /* Validate we're on the proper machine type */
128 if (mips_machtype != MACH_DS5000_XX) {
129 return -EINVAL;
130 }
131
132 printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
133 printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
134
135 /* Framebuffer display memory base address */
136 fb_start = DS5000_xx_ONBOARD_FBMEM_START;
137
138 /* Clear screen */
139 for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
140 *(volatile unsigned char *)fboff = 0x0;
141
142 maxinefb_fix.smem_start = fb_start;
143
144 /* erase hardware cursor */
145 for (i = 0; i < 512; i++) {
146 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
147 0);
148 /*
149 if (i&0x8 == 0)
150 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
151 else
152 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
153 */
154 }
155
156 fb_info.fbops = &maxinefb_ops;
157 fb_info.screen_base = (char *)maxinefb_fix.smem_start;
158 fb_info.var = maxinefb_defined;
159 fb_info.fix = maxinefb_fix;
160 fb_info.flags = FBINFO_DEFAULT;
161
162 fb_alloc_cmap(&fb_info.cmap, 256, 0);
163
164 if (register_framebuffer(&fb_info) < 0)
165 return 1;
166 return 0;
167}
168
169static void __exit maxinefb_exit(void)
170{
171 unregister_framebuffer(&fb_info);
172}
173
174#ifdef MODULE
175MODULE_LICENSE("GPL");
176#endif
177module_init(maxinefb_init);
178module_exit(maxinefb_exit);
179