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 <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/errno.h>
29 #include <linux/string.h>
30 #include <linux/mm.h>
31 #include <linux/slab.h>
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/fb.h>
35 #include <video/maxinefb.h>
36
37 /* bootinfo.h defines the machine type values, needed when checking */
38 /* whether are really running on a maxine, KM */
39 #include <asm/bootinfo.h>
40
41 static struct fb_info fb_info;
42
43 static struct fb_var_screeninfo maxinefb_defined = {
44 .xres = 1024,
45 .yres = 768,
46 .xres_virtual = 1024,
47 .yres_virtual = 768,
48 .bits_per_pixel =8,
49 .activate = FB_ACTIVATE_NOW,
50 .height = -1,
51 .width = -1,
52 .vmode = FB_VMODE_NONINTERLACED,
53 };
54
55 static struct fb_fix_screeninfo maxinefb_fix = {
56 .id = "Maxine",
57 .smem_len = (1024*768),
58 .type = FB_TYPE_PACKED_PIXELS,
59 .visual = FB_VISUAL_PSEUDOCOLOR,
60 .line_length = 1024,
61 };
62
63 /* Handle the funny Inmos RamDAC/video controller ... */
64
65 void maxinefb_ims332_write_register(int regno, register unsigned int val)
66 {
67 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
68 unsigned char *wptr;
69
70 wptr = regs + 0xa0000 + (regno << 4);
71 *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
72 *((volatile unsigned short *) (wptr)) = val;
73 }
74
75 unsigned int maxinefb_ims332_read_register(int regno)
76 {
77 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
78 unsigned char *rptr;
79 register unsigned int j, k;
80
81 rptr = regs + 0x80000 + (regno << 4);
82 j = *((volatile unsigned short *) rptr);
83 k = *((volatile unsigned short *) regs);
84
85 return (j & 0xffff) | ((k & 0xff00) << 8);
86 }
87
88 /* Set the palette */
89 static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
90 unsigned blue, unsigned transp, struct fb_info *info)
91 {
92 /* value to be written into the palette reg. */
93 unsigned long hw_colorvalue = 0;
94
95 red >>= 8; /* The cmap fields are 16 bits */
96 green >>= 8; /* wide, but the harware colormap */
97 blue >>= 8; /* registers are only 8 bits wide */
98
99 hw_colorvalue = (blue << 16) + (green << 8) + (red);
100
101 maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
102 hw_colorvalue);
103 return 0;
104 }
105
106 static struct fb_ops maxinefb_ops = {
107 .owner = THIS_MODULE,
108 .fb_setcolreg = maxinefb_setcolreg,
109 .fb_fillrect = cfb_fillrect,
110 .fb_copyarea = cfb_copyarea,
111 .fb_imageblit = cfb_imageblit,
112 };
113
114 int __init maxinefb_init(void)
115 {
116 unsigned long fboff;
117 unsigned long fb_start;
118 int i;
119
120 if (fb_get_options("maxinefb", NULL))
121 return -ENODEV;
122
123 /* Validate we're on the proper machine type */
124 if (mips_machtype != MACH_DS5000_XX) {
125 return -EINVAL;
126 }
127
128 printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
129 printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
130
131 /* Framebuffer display memory base address */
132 fb_start = DS5000_xx_ONBOARD_FBMEM_START;
133
134 /* Clear screen */
135 for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
136 *(volatile unsigned char *)fboff = 0x0;
137
138 maxinefb_fix.smem_start = fb_start;
139
140 /* erase hardware cursor */
141 for (i = 0; i < 512; i++) {
142 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
143 0);
144 /*
145 if (i&0x8 == 0)
146 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
147 else
148 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
149 */
150 }
151
152 fb_info.fbops = &maxinefb_ops;
153 fb_info.screen_base = (char *)maxinefb_fix.smem_start;
154 fb_info.var = maxinefb_defined;
155 fb_info.fix = maxinefb_fix;
156 fb_info.flags = FBINFO_DEFAULT;
157
158 fb_alloc_cmap(&fb_info.cmap, 256, 0);
159
160 if (register_framebuffer(&fb_info) < 0)
161 return 1;
162 return 0;
163 }
164
165 static void __exit maxinefb_exit(void)
166 {
167 unregister_framebuffer(&fb_info);
168 }
169
170 #ifdef MODULE
171 MODULE_LICENSE("GPL");
172 #endif
173 module_init(maxinefb_init);
174 module_exit(maxinefb_exit);
175
176
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