tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/tty.h>
18#include <linux/slab.h>
19#include <linux/delay.h>
20#include <linux/interrupt.h>
21
22#include <asm/uaccess.h>
23#include <asm/setup.h>
24#include <asm/segment.h>
25#include <asm/system.h>
26#include <asm/q40_master.h>
27#include <linux/fb.h>
28#include <linux/module.h>
29#include <asm/pgtable.h>
30
31#define Q40_PHYS_SCREEN_ADDR 0xFE800000
32
33static struct fb_fix_screeninfo q40fb_fix __initdata = {
34 .id = "Q40",
35 .smem_len = 1024*1024,
36 .type = FB_TYPE_PACKED_PIXELS,
37 .visual = FB_VISUAL_TRUECOLOR,
38 .line_length = 1024*2,
39 .accel = FB_ACCEL_NONE,
40};
41
42static struct fb_var_screeninfo q40fb_var __initdata = {
43 .xres = 1024,
44 .yres = 512,
45 .xres_virtual = 1024,
46 .yres_virtual = 512,
47 .bits_per_pixel = 16,
48 .red = {6, 5, 0},
49 .green = {11, 5, 0},
50 .blue = {0, 6, 0},
51 .activate = FB_ACTIVATE_NOW,
52 .height = 230,
53 .width = 300,
54 .vmode = FB_VMODE_NONINTERLACED,
55};
56
57static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
58 unsigned blue, unsigned transp,
59 struct fb_info *info)
60{
61 /*
62 * Set a single color register. The values supplied have a 16 bit
63 * magnitude.
64 * Return != 0 for invalid regno.
65 */
66
67 if (regno > 255)
68 return 1;
69 red>>=11;
70 green>>=11;
71 blue>>=10;
72
73 if (regno < 16) {
74 ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
75 ((green & 31) << 11) |
76 (blue & 63);
77 }
78 return 0;
79}
80
81static struct fb_ops q40fb_ops = {
82 .owner = THIS_MODULE,
83 .fb_setcolreg = q40fb_setcolreg,
84 .fb_fillrect = cfb_fillrect,
85 .fb_copyarea = cfb_copyarea,
86 .fb_imageblit = cfb_imageblit,
87 .fb_cursor = soft_cursor,
88};
89
90static int __init q40fb_probe(struct device *device)
91{
92 struct platform_device *dev = to_platform_device(device);
93 struct fb_info *info;
94
95 if (!MACH_IS_Q40)
96 return -ENXIO;
97
98 /* mapped in q40/config.c */
99 q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
100
101 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
102 if (!info)
103 return -ENOMEM;
104
105 info->var = q40fb_var;
106 info->fix = q40fb_fix;
107 info->fbops = &q40fb_ops;
108 info->flags = FBINFO_DEFAULT; /* not as module for now */
109 info->pseudo_palette = info->par;
110 info->par = NULL;
111 info->screen_base = (char *) q40fb_fix.smem_start;
112
113 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
114 framebuffer_release(info);
115 return -ENOMEM;
116 }
117
118 master_outb(3, DISPLAY_CONTROL_REG);
119
120 if (register_framebuffer(info) < 0) {
121 printk(KERN_ERR "Unable to register Q40 frame buffer\n");
122 fb_dealloc_cmap(&info->cmap);
123 framebuffer_release(info);
124 return -EINVAL;
125 }
126
127 printk(KERN_INFO "fb%d: Q40 frame buffer alive and kicking !\n",
128 info->node);
129 return 0;
130}
131
132static struct device_driver q40fb_driver = {
133 .name = "q40fb",
134 .bus = &platform_bus_type,
135 .probe = q40fb_probe,
136};
137
138static struct platform_device q40fb_device = {
139 .name = "q40fb",
140};
141
142int __init q40fb_init(void)
143{
144 int ret = 0;
145
146 if (fb_get_options("q40fb", NULL))
147 return -ENODEV;
148
149 ret = driver_register(&q40fb_driver);
150
151 if (!ret) {
152 ret = platform_device_register(&q40fb_device);
153 if (ret)
154 driver_unregister(&q40fb_driver);
155 }
156 return ret;
157}
158
159module_init(q40fb_init);
160MODULE_LICENSE("GPL");