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1/*
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 <[email protected]> 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 <[email protected]> and
11 * Karsten Merker <[email protected]>.
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/errno.h>
29#include <linux/string.h>
30#include <linux/mm.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/fb.h>
34#include <video/maxinefb.h>
35
36/* bootinfo.h defines the machine type values, needed when checking */
37/* whether are really running on a maxine, KM */
38#include <asm/bootinfo.h>
39
40static struct fb_info fb_info;
41
42static const struct fb_var_screeninfo maxinefb_defined = {
43 .xres = 1024,
44 .yres = 768,
45 .xres_virtual = 1024,
46 .yres_virtual = 768,
47 .bits_per_pixel =8,
48 .activate = FB_ACTIVATE_NOW,
49 .height = -1,
50 .width = -1,
51 .vmode = FB_VMODE_NONINTERLACED,
52};
53
54static struct fb_fix_screeninfo maxinefb_fix __initdata = {
55 .id = "Maxine",
56 .smem_len = (1024*768),
57 .type = FB_TYPE_PACKED_PIXELS,
58 .visual = FB_VISUAL_PSEUDOCOLOR,
59 .line_length = 1024,
60};
61
62/* Handle the funny Inmos RamDAC/video controller ... */
63
64static void maxinefb_ims332_write_register(int regno, register unsigned int val)
65{
66 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
67 unsigned char *wptr;
68
69 wptr = regs + 0xa0000 + (regno << 4);
70 *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
71 *((volatile unsigned short *) (wptr)) = val;
72}
73
74#if 0
75/* dead code: leave here for hardware interface documentation */
76static unsigned 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#endif
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 if (regno > 255)
98 return 1;
99
100 red >>= 8; /* The cmap fields are 16 bits */
101 green >>= 8; /* wide, but the harware colormap */
102 blue >>= 8; /* registers are only 8 bits wide */
103
104 hw_colorvalue = (blue << 16) + (green << 8) + (red);
105
106 maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
107 hw_colorvalue);
108 return 0;
109}
110
111static const struct fb_ops maxinefb_ops = {
112 .owner = THIS_MODULE,
113 FB_DEFAULT_IOMEM_OPS,
114 .fb_setcolreg = maxinefb_setcolreg,
115};
116
117static int __init maxinefb_init(void)
118{
119 unsigned long fboff;
120 unsigned long fb_start;
121 int i;
122
123 if (fb_get_options("maxinefb", NULL))
124 return -ENODEV;
125
126 /* Validate we're on the proper machine type */
127 if (mips_machtype != MACH_DS5000_XX) {
128 return -EINVAL;
129 }
130
131 printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
132 printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
133
134 /* Framebuffer display memory base address */
135 fb_start = DS5000_xx_ONBOARD_FBMEM_START;
136
137 /* Clear screen */
138 for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
139 *(volatile unsigned char *)fboff = 0x0;
140
141 maxinefb_fix.smem_start = fb_start;
142
143 /* erase hardware cursor */
144 for (i = 0; i < 512; i++) {
145 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
146 0);
147 /*
148 if (i&0x8 == 0)
149 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
150 else
151 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
152 */
153 }
154
155 fb_info.fbops = &maxinefb_ops;
156 fb_info.screen_base = (char *)maxinefb_fix.smem_start;
157 fb_info.var = maxinefb_defined;
158 fb_info.fix = maxinefb_fix;
159
160 fb_alloc_cmap(&fb_info.cmap, 256, 0);
161
162 if (register_framebuffer(&fb_info) < 0)
163 return -ENODEV;
164 return 0;
165}
166
167static void __exit maxinefb_exit(void)
168{
169 unregister_framebuffer(&fb_info);
170}
171
172module_init(maxinefb_init);
173module_exit(maxinefb_exit);
174
175MODULE_LICENSE("GPL");