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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 <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 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 = { |
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 | |
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 | |
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 */ |
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 struct fb_ops maxinefb_ops = { |
109 | .owner = THIS_MODULE, |
110 | .fb_setcolreg = maxinefb_setcolreg, |
111 | .fb_fillrect = cfb_fillrect, |
112 | .fb_copyarea = cfb_copyarea, |
113 | .fb_imageblit = cfb_imageblit, |
114 | }; |
115 | |
116 | int __init maxinefb_init(void) |
117 | { |
118 | unsigned long fboff; |
119 | unsigned long fb_start; |
120 | int i; |
121 | |
122 | if (fb_get_options("maxinefb", NULL)) |
123 | return -ENODEV; |
124 | |
125 | /* Validate we're on the proper machine type */ |
126 | if (mips_machtype != MACH_DS5000_XX) { |
127 | return -EINVAL; |
128 | } |
129 | |
130 | printk(KERN_INFO "Maxinefb: Personal DECstation detected\n"); |
131 | printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n"); |
132 | |
133 | /* Framebuffer display memory base address */ |
134 | fb_start = DS5000_xx_ONBOARD_FBMEM_START; |
135 | |
136 | /* Clear screen */ |
137 | for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++) |
138 | *(volatile unsigned char *)fboff = 0x0; |
139 | |
140 | maxinefb_fix.smem_start = fb_start; |
141 | |
142 | /* erase hardware cursor */ |
143 | for (i = 0; i < 512; i++) { |
144 | maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i, |
145 | 0); |
146 | /* |
147 | if (i&0x8 == 0) |
148 | maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f); |
149 | else |
150 | maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0); |
151 | */ |
152 | } |
153 | |
154 | fb_info.fbops = &maxinefb_ops; |
155 | fb_info.screen_base = (char *)maxinefb_fix.smem_start; |
156 | fb_info.var = maxinefb_defined; |
157 | fb_info.fix = maxinefb_fix; |
158 | fb_info.flags = FBINFO_DEFAULT; |
159 | |
160 | fb_alloc_cmap(&fb_info.cmap, 256, 0); |
161 | |
162 | if (register_framebuffer(&fb_info) < 0) |
163 | return 1; |
164 | return 0; |
165 | } |
166 | |
167 | static void __exit maxinefb_exit(void) |
168 | { |
169 | unregister_framebuffer(&fb_info); |
170 | } |
171 | |
172 | #ifdef MODULE |
173 | MODULE_LICENSE("GPL"); |
174 | #endif |
175 | module_init(maxinefb_init); |
176 | module_exit(maxinefb_exit); |
177 | |
178 |
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