1 /*
2 * linux/drivers/video/q40fb.c -- Q40 frame buffer device
3 *
4 * Copyright (C) 2001
5 *
6 * Richard Zidlicky <rz@linux-m68k.org>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
10 * more details.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/mm.h>
17 #include <linux/delay.h>
18 #include <linux/interrupt.h>
19 #include <linux/platform_device.h>
20
21 #include <linux/uaccess.h>
22 #include <asm/setup.h>
23 #include <asm/q40_master.h>
24 #include <linux/fb.h>
25 #include <linux/module.h>
26
27 #define Q40_PHYS_SCREEN_ADDR 0xFE800000
28
29 static struct fb_fix_screeninfo q40fb_fix = {
30 .id = "Q40",
31 .smem_len = 1024*1024,
32 .type = FB_TYPE_PACKED_PIXELS,
33 .visual = FB_VISUAL_TRUECOLOR,
34 .line_length = 1024*2,
35 .accel = FB_ACCEL_NONE,
36 };
37
38 static const struct fb_var_screeninfo q40fb_var = {
39 .xres = 1024,
40 .yres = 512,
41 .xres_virtual = 1024,
42 .yres_virtual = 512,
43 .bits_per_pixel = 16,
44 .red = {6, 5, 0},
45 .green = {11, 5, 0},
46 .blue = {0, 6, 0},
47 .activate = FB_ACTIVATE_NOW,
48 .height = 230,
49 .width = 300,
50 .vmode = FB_VMODE_NONINTERLACED,
51 };
52
q40fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)53 static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
54 unsigned blue, unsigned transp,
55 struct fb_info *info)
56 {
57 /*
58 * Set a single color register. The values supplied have a 16 bit
59 * magnitude.
60 * Return != 0 for invalid regno.
61 */
62
63 if (regno > 255)
64 return 1;
65 red>>=11;
66 green>>=11;
67 blue>>=10;
68
69 if (regno < 16) {
70 ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
71 ((green & 31) << 11) |
72 (blue & 63);
73 }
74 return 0;
75 }
76
77 static const struct fb_ops q40fb_ops = {
78 .owner = THIS_MODULE,
79 FB_DEFAULT_IOMEM_OPS,
80 .fb_setcolreg = q40fb_setcolreg,
81 };
82
q40fb_probe(struct platform_device * dev)83 static int q40fb_probe(struct platform_device *dev)
84 {
85 struct fb_info *info;
86
87 if (!MACH_IS_Q40)
88 return -ENXIO;
89
90 /* mapped in q40/config.c */
91 q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
92
93 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
94 if (!info)
95 return -ENOMEM;
96
97 info->var = q40fb_var;
98 info->fix = q40fb_fix;
99 info->fbops = &q40fb_ops;
100 info->pseudo_palette = info->par;
101 info->par = NULL;
102 info->screen_base = (char *) q40fb_fix.smem_start;
103
104 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
105 framebuffer_release(info);
106 return -ENOMEM;
107 }
108
109 master_outb(3, DISPLAY_CONTROL_REG);
110
111 if (register_framebuffer(info) < 0) {
112 printk(KERN_ERR "Unable to register Q40 frame buffer\n");
113 fb_dealloc_cmap(&info->cmap);
114 framebuffer_release(info);
115 return -EINVAL;
116 }
117
118 fb_info(info, "Q40 frame buffer alive and kicking !\n");
119 return 0;
120 }
121
122 static struct platform_driver q40fb_driver = {
123 .probe = q40fb_probe,
124 .driver = {
125 .name = "q40fb",
126 },
127 };
128
129 static struct platform_device q40fb_device = {
130 .name = "q40fb",
131 };
132
q40fb_init(void)133 static int __init q40fb_init(void)
134 {
135 int ret = 0;
136
137 if (fb_get_options("q40fb", NULL))
138 return -ENODEV;
139
140 ret = platform_driver_register(&q40fb_driver);
141
142 if (!ret) {
143 ret = platform_device_register(&q40fb_device);
144 if (ret)
145 platform_driver_unregister(&q40fb_driver);
146 }
147 return ret;
148 }
149
150 module_init(q40fb_init);
151 MODULE_LICENSE("GPL");
152