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 <asm/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
30static 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
39static 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
54static 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
78static 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
86static 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
126static struct platform_driver q40fb_driver = {
127	.probe	= q40fb_probe,
128	.driver	= {
129		.name	= "q40fb",
130	},
131};
132
133static struct platform_device q40fb_device = {
134	.name	= "q40fb",
135};
136
137int __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
154module_init(q40fb_init);
155MODULE_LICENSE("GPL");
156