q40fb.c

  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
 29static 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
 38static 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
 53static 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
 77static const struct fb_ops q40fb_ops = {
 78	.owner		= THIS_MODULE,
 79	FB_DEFAULT_IOMEM_OPS,
 80	.fb_setcolreg	= q40fb_setcolreg,
 81};
 82
 83static 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
122static struct platform_driver q40fb_driver = {
123	.probe	= q40fb_probe,
124	.driver	= {
125		.name	= "q40fb",
126	},
127};
128
129static struct platform_device q40fb_device = {
130	.name	= "q40fb",
131};
132
133static 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
150module_init(q40fb_init);
151MODULE_LICENSE("GPL");