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/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
43 static struct fb_info fb_info;
44
45 static 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
57 static 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
67 void 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
77 unsigned 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 */
91 static 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
108 static 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,
116 .fb_cursor = soft_cursor,
117 };
118
119 int __init maxinefb_init(void)
120 {
121 unsigned long fboff;
122 unsigned long fb_start;
123 int i;
124
125 if (fb_get_options("maxinefb", NULL))
126 return -ENODEV;
127
128 /* Validate we're on the proper machine type */
129 if (mips_machtype != MACH_DS5000_XX) {
130 return -EINVAL;
131 }
132
133 printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
134 printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
135
136 /* Framebuffer display memory base address */
137 fb_start = DS5000_xx_ONBOARD_FBMEM_START;
138
139 /* Clear screen */
140 for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
141 *(volatile unsigned char *)fboff = 0x0;
142
143 maxinefb_fix.smem_start = fb_start;
144
145 /* erase hardware cursor */
146 for (i = 0; i < 512; i++) {
147 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
148 0);
149 /*
150 if (i&0x8 == 0)
151 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
152 else
153 maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
154 */
155 }
156
157 fb_info.fbops = &maxinefb_ops;
158 fb_info.screen_base = (char *)maxinefb_fix.smem_start;
159 fb_info.var = maxinefb_defined;
160 fb_info.fix = maxinefb_fix;
161 fb_info.flags = FBINFO_DEFAULT;
162
163 fb_alloc_cmap(&fb_info.cmap, 256, 0);
164
165 if (register_framebuffer(&fb_info) < 0)
166 return 1;
167 return 0;
168 }
169
170 static void __exit maxinefb_exit(void)
171 {
172 unregister_framebuffer(&fb_info);
173 }
174
175 #ifdef MODULE
176 MODULE_LICENSE("GPL");
177 #endif
178 module_init(maxinefb_init);
179 module_exit(maxinefb_exit);
180
181
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