/*
 * linux/drivers/video/q40fb.c -- Q40 frame buffer device
 *
 * Copyright (C) 2001
 *
 *      Richard Zidlicky <rz@linux-m68k.org>
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License. See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <linux/uaccess.h>
#include <asm/setup.h>
#include <asm/q40_master.h>
#include <linux/fb.h>
#include <linux/module.h>

#define Q40_PHYS_SCREEN_ADDR 0xFE800000

static struct fb_fix_screeninfo q40fb_fix = {
        .id             = "Q40",
        .smem_len       = 1024*1024,
        .type           = FB_TYPE_PACKED_PIXELS,
        .visual         = FB_VISUAL_TRUECOLOR,
        .line_length    = 1024*2,
        .accel          = FB_ACCEL_NONE,
};

static const struct fb_var_screeninfo q40fb_var = {
        .xres           = 1024,
        .yres           = 512,
        .xres_virtual   = 1024,
        .yres_virtual   = 512,
        .bits_per_pixel = 16,
        .red            = {6, 5, 0},
        .green          = {11, 5, 0},
        .blue           = {0, 6, 0},
        .activate       = FB_ACTIVATE_NOW,
        .height         = 230,
        .width          = 300,
        .vmode          = FB_VMODE_NONINTERLACED,
};

static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
                           unsigned blue, unsigned transp,
                           struct fb_info *info)
{
    /*
     *  Set a single color register. The values supplied have a 16 bit
     *  magnitude.
     *  Return != 0 for invalid regno.
     */

    if (regno > 255)
            return 1;
    red>>=11;
    green>>=11;
    blue>>=10;

    if (regno < 16) {
        ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
                                               ((green & 31) << 11) |
                                               (blue & 63);
    }
    return 0;
}

static const struct fb_ops q40fb_ops = {
        .owner          = THIS_MODULE,
        FB_DEFAULT_IOMEM_OPS,
        .fb_setcolreg   = q40fb_setcolreg,
};

static int q40fb_probe(struct platform_device *dev)
{
        struct fb_info *info;

        if (!MACH_IS_Q40)
                return -ENXIO;

        /* mapped in q40/config.c */
        q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;

        info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
        if (!info)
                return -ENOMEM;

        info->var = q40fb_var;
        info->fix = q40fb_fix;
        info->fbops = &q40fb_ops;
        info->pseudo_palette = info->par;
        info->par = NULL;
        info->screen_base = (char *) q40fb_fix.smem_start;

        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
                framebuffer_release(info);
                return -ENOMEM;
        }

        master_outb(3, DISPLAY_CONTROL_REG);

        if (register_framebuffer(info) < 0) {
                printk(KERN_ERR "Unable to register Q40 frame buffer\n");
                fb_dealloc_cmap(&info->cmap);
                framebuffer_release(info);
                return -EINVAL;
        }

        fb_info(info, "Q40 frame buffer alive and kicking !\n");
        return 0;
}

static struct platform_driver q40fb_driver = {
        .probe  = q40fb_probe,
        .driver = {
                .name   = "q40fb",
        },
};

static struct platform_device q40fb_device = {
        .name   = "q40fb",
};

static int __init q40fb_init(void)
{
        int ret = 0;

        if (fb_get_options("q40fb", NULL))
                return -ENODEV;

        ret = platform_driver_register(&q40fb_driver);

        if (!ret) {
                ret = platform_device_register(&q40fb_device);
                if (ret)
                        platform_driver_unregister(&q40fb_driver);
        }
        return ret;
}

module_init(q40fb_init);
MODULE_LICENSE("GPL");