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/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
40 static struct fb_info fb_info;
41
42 static 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
54 static 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
maxinefb_ims332_write_register(int regno,register unsigned int val)64 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
maxinefb_ims332_read_register(int regno)74 unsigned int maxinefb_ims332_read_register(int regno)
75 {
76 register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
77 unsigned char *rptr;
78 register unsigned int j, k;
79
80 rptr = regs + 0x80000 + (regno << 4);
81 j = *((volatile unsigned short *) rptr);
82 k = *((volatile unsigned short *) regs);
83
84 return (j & 0xffff) | ((k & 0xff00) << 8);
85 }
86
87 /* Set the palette */
maxinefb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)88 static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
89 unsigned blue, unsigned transp, struct fb_info *info)
90 {
91 /* value to be written into the palette reg. */
92 unsigned long hw_colorvalue = 0;
93
94 if (regno > 255)
95 return 1;
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 const struct fb_ops maxinefb_ops = {
109 .owner = THIS_MODULE,
110 FB_DEFAULT_IOMEM_OPS,
111 .fb_setcolreg = maxinefb_setcolreg,
112 };
113
maxinefb_init(void)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
157 fb_alloc_cmap(&fb_info.cmap, 256, 0);
158
159 if (register_framebuffer(&fb_info) < 0)
160 return 1;
161 return 0;
162 }
163
maxinefb_exit(void)164 static void __exit maxinefb_exit(void)
165 {
166 unregister_framebuffer(&fb_info);
167 }
168
169 #ifdef MODULE
170 MODULE_LICENSE("GPL");
171 #endif
172 module_init(maxinefb_init);
173 module_exit(maxinefb_exit);
174
175