xref: /openbmc/linux/drivers/video/fbdev/q40fb.c (revision b2765275)
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 #include <asm/pgtable.h>
27 
28 #define Q40_PHYS_SCREEN_ADDR 0xFE800000
29 
30 static struct fb_fix_screeninfo q40fb_fix = {
31 	.id		= "Q40",
32 	.smem_len	= 1024*1024,
33 	.type		= FB_TYPE_PACKED_PIXELS,
34 	.visual		= FB_VISUAL_TRUECOLOR,
35 	.line_length	= 1024*2,
36 	.accel		= FB_ACCEL_NONE,
37 };
38 
39 static const struct fb_var_screeninfo q40fb_var = {
40 	.xres		= 1024,
41 	.yres		= 512,
42 	.xres_virtual	= 1024,
43 	.yres_virtual	= 512,
44 	.bits_per_pixel	= 16,
45     	.red		= {6, 5, 0},
46 	.green		= {11, 5, 0},
47 	.blue		= {0, 6, 0},
48 	.activate	= FB_ACTIVATE_NOW,
49 	.height		= 230,
50 	.width		= 300,
51 	.vmode		= FB_VMODE_NONINTERLACED,
52 };
53 
54 static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
55 			   unsigned blue, unsigned transp,
56 			   struct fb_info *info)
57 {
58     /*
59      *  Set a single color register. The values supplied have a 16 bit
60      *  magnitude.
61      *  Return != 0 for invalid regno.
62      */
63 
64     if (regno > 255)
65 	    return 1;
66     red>>=11;
67     green>>=11;
68     blue>>=10;
69 
70     if (regno < 16) {
71 	((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
72 					       ((green & 31) << 11) |
73 					       (blue & 63);
74     }
75     return 0;
76 }
77 
78 static const struct fb_ops q40fb_ops = {
79 	.owner		= THIS_MODULE,
80 	.fb_setcolreg	= q40fb_setcolreg,
81 	.fb_fillrect	= cfb_fillrect,
82 	.fb_copyarea	= cfb_copyarea,
83 	.fb_imageblit	= cfb_imageblit,
84 };
85 
86 static int q40fb_probe(struct platform_device *dev)
87 {
88 	struct fb_info *info;
89 
90 	if (!MACH_IS_Q40)
91 		return -ENXIO;
92 
93 	/* mapped in q40/config.c */
94 	q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
95 
96 	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
97 	if (!info)
98 		return -ENOMEM;
99 
100 	info->var = q40fb_var;
101 	info->fix = q40fb_fix;
102 	info->fbops = &q40fb_ops;
103 	info->flags = FBINFO_DEFAULT;  /* not as module for now */
104 	info->pseudo_palette = info->par;
105 	info->par = NULL;
106 	info->screen_base = (char *) q40fb_fix.smem_start;
107 
108 	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
109 		framebuffer_release(info);
110 		return -ENOMEM;
111 	}
112 
113 	master_outb(3, DISPLAY_CONTROL_REG);
114 
115 	if (register_framebuffer(info) < 0) {
116 		printk(KERN_ERR "Unable to register Q40 frame buffer\n");
117 		fb_dealloc_cmap(&info->cmap);
118 		framebuffer_release(info);
119 		return -EINVAL;
120 	}
121 
122 	fb_info(info, "Q40 frame buffer alive and kicking !\n");
123 	return 0;
124 }
125 
126 static struct platform_driver q40fb_driver = {
127 	.probe	= q40fb_probe,
128 	.driver	= {
129 		.name	= "q40fb",
130 	},
131 };
132 
133 static struct platform_device q40fb_device = {
134 	.name	= "q40fb",
135 };
136 
137 int __init q40fb_init(void)
138 {
139 	int ret = 0;
140 
141 	if (fb_get_options("q40fb", NULL))
142 		return -ENODEV;
143 
144 	ret = platform_driver_register(&q40fb_driver);
145 
146 	if (!ret) {
147 		ret = platform_device_register(&q40fb_device);
148 		if (ret)
149 			platform_driver_unregister(&q40fb_driver);
150 	}
151 	return ret;
152 }
153 
154 module_init(q40fb_init);
155 MODULE_LICENSE("GPL");
156