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_setcolreg = maxinefb_setcolreg,
111 .fb_fillrect = cfb_fillrect,
112 .fb_copyarea = cfb_copyarea,
113 .fb_imageblit = cfb_imageblit,
114 };
115
maxinefb_init(void)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
maxinefb_exit(void)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