xref: /openbmc/linux/drivers/video/fbdev/q40fb.c (revision 11c416e3)
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 
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_setcolreg	= q40fb_setcolreg,
80 	.fb_fillrect	= cfb_fillrect,
81 	.fb_copyarea	= cfb_copyarea,
82 	.fb_imageblit	= cfb_imageblit,
83 };
84 
85 static int q40fb_probe(struct platform_device *dev)
86 {
87 	struct fb_info *info;
88 
89 	if (!MACH_IS_Q40)
90 		return -ENXIO;
91 
92 	/* mapped in q40/config.c */
93 	q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
94 
95 	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
96 	if (!info)
97 		return -ENOMEM;
98 
99 	info->var = q40fb_var;
100 	info->fix = q40fb_fix;
101 	info->fbops = &q40fb_ops;
102 	info->flags = FBINFO_DEFAULT;  /* not as module for now */
103 	info->pseudo_palette = info->par;
104 	info->par = NULL;
105 	info->screen_base = (char *) q40fb_fix.smem_start;
106 
107 	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
108 		framebuffer_release(info);
109 		return -ENOMEM;
110 	}
111 
112 	master_outb(3, DISPLAY_CONTROL_REG);
113 
114 	if (register_framebuffer(info) < 0) {
115 		printk(KERN_ERR "Unable to register Q40 frame buffer\n");
116 		fb_dealloc_cmap(&info->cmap);
117 		framebuffer_release(info);
118 		return -EINVAL;
119 	}
120 
121 	fb_info(info, "Q40 frame buffer alive and kicking !\n");
122 	return 0;
123 }
124 
125 static struct platform_driver q40fb_driver = {
126 	.probe	= q40fb_probe,
127 	.driver	= {
128 		.name	= "q40fb",
129 	},
130 };
131 
132 static struct platform_device q40fb_device = {
133 	.name	= "q40fb",
134 };
135 
136 int __init q40fb_init(void)
137 {
138 	int ret = 0;
139 
140 	if (fb_get_options("q40fb", NULL))
141 		return -ENODEV;
142 
143 	ret = platform_driver_register(&q40fb_driver);
144 
145 	if (!ret) {
146 		ret = platform_device_register(&q40fb_device);
147 		if (ret)
148 			platform_driver_unregister(&q40fb_driver);
149 	}
150 	return ret;
151 }
152 
153 module_init(q40fb_init);
154 MODULE_LICENSE("GPL");
155