blob: 38c8d38de4fdd5566d065c6e697aa8c6c57637ca [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/slab.h>
33#include <linux/delay.h>
34#include <linux/init.h>
35#include <linux/fb.h>
36#include <video/maxinefb.h>
37
38/* bootinfo.h defines the machine type values, needed when checking */
39/* whether are really running on a maxine, KM */
40#include <asm/bootinfo.h>
41
42static struct fb_info fb_info;
43
44static struct fb_var_screeninfo maxinefb_defined = {
45 .xres = 1024,
46 .yres = 768,
47 .xres_virtual = 1024,
48 .yres_virtual = 768,
49 .bits_per_pixel =8,
50 .activate = FB_ACTIVATE_NOW,
51 .height = -1,
52 .width = -1,
53 .vmode = FB_VMODE_NONINTERLACED,
54};
55
56static struct fb_fix_screeninfo maxinefb_fix = {
Martin Michlmayr8fd66ab2006-05-30 21:27:02 -070057 .id = "Maxine",
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 .smem_len = (1024*768),
59 .type = FB_TYPE_PACKED_PIXELS,
60 .visual = FB_VISUAL_PSEUDOCOLOR,
61 .line_length = 1024,
62};
63
64/* Handle the funny Inmos RamDAC/video controller ... */
65
66void maxinefb_ims332_write_register(int regno, register unsigned int val)
67{
68 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
69 unsigned char *wptr;
70
71 wptr = regs + 0xa0000 + (regno << 4);
72 *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
73 *((volatile unsigned short *) (wptr)) = val;
74}
75
76unsigned int maxinefb_ims332_read_register(int regno)
77{
78 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
79 unsigned char *rptr;
80 register unsigned int j, k;
81
82 rptr = regs + 0x80000 + (regno << 4);
83 j = *((volatile unsigned short *) rptr);
84 k = *((volatile unsigned short *) regs);
85
86 return (j & 0xffff) | ((k & 0xff00) << 8);
87}
88
89/* Set the palette */
90static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
91 unsigned blue, unsigned transp, struct fb_info *info)
92{
93 /* value to be written into the palette reg. */
94 unsigned long hw_colorvalue = 0;
95
96 red >>= 8; /* The cmap fields are 16 bits */
97 green >>= 8; /* wide, but the harware colormap */
98 blue >>= 8; /* registers are only 8 bits wide */
99
100 hw_colorvalue = (blue << 16) + (green << 8) + (red);
101
102 maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
103 hw_colorvalue);
104 return 0;
105}
106
107static struct fb_ops maxinefb_ops = {
108 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 .fb_setcolreg = maxinefb_setcolreg,
110 .fb_fillrect = cfb_fillrect,
111 .fb_copyarea = cfb_copyarea,
112 .fb_imageblit = cfb_imageblit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113};
114
115int __init maxinefb_init(void)
116{
117 unsigned long fboff;
118 unsigned long fb_start;
119 int i;
120
121 if (fb_get_options("maxinefb", NULL))
122 return -ENODEV;
123
124 /* Validate we're on the proper machine type */
125 if (mips_machtype != MACH_DS5000_XX) {
126 return -EINVAL;
127 }
128
129 printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
130 printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
131
132 /* Framebuffer display memory base address */
133 fb_start = DS5000_xx_ONBOARD_FBMEM_START;
134
135 /* Clear screen */
136 for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
137 *(volatile unsigned char *)fboff = 0x0;
138
139 maxinefb_fix.smem_start = fb_start;
140
141 /* erase hardware cursor */
142 for (i = 0; i < 512; i++) {
143 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
144 0);
145 /*
146 if (i&0x8 == 0)
147 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
148 else
149 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
150 */
151 }
152
153 fb_info.fbops = &maxinefb_ops;
154 fb_info.screen_base = (char *)maxinefb_fix.smem_start;
155 fb_info.var = maxinefb_defined;
156 fb_info.fix = maxinefb_fix;
157 fb_info.flags = FBINFO_DEFAULT;
158
159 fb_alloc_cmap(&fb_info.cmap, 256, 0);
160
161 if (register_framebuffer(&fb_info) < 0)
162 return 1;
163 return 0;
164}
165
166static void __exit maxinefb_exit(void)
167{
168 unregister_framebuffer(&fb_info);
169}
170
171#ifdef MODULE
172MODULE_LICENSE("GPL");
173#endif
174module_init(maxinefb_init);
175module_exit(maxinefb_exit);
176