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/*

 *      linux/drivers/video/maxinefb.c

 *

 *      DECstation 5000/xx onboard framebuffer support ... derived from:

 *      "HP300 Topcat framebuffer support (derived from macfb of all things)

 *      Phil Blundell <philb@gnu.org> 1998", the original code can be

 *      found in the file hpfb.c in the same directory.

 *

 *      DECstation related code Copyright (C) 1999,2000,2001 by

 *      Michael Engel <engel@unix-ag.org> and

 *      Karsten Merker <merker@linuxtag.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.

 *

 */

/*

 * Changes:

 * 2001/01/27 removed debugging and testing code, fixed fb_ops

 *            initialization which had caused a crash before,

 *            general cleanup, first official release (KM)

 *

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/fb.h>

#include <video/maxinefb.h>

/* bootinfo.h defines the machine type values, needed when checking */

/* whether are really running on a maxine, KM                       */

#include <asm/bootinfo.h>

static struct fb_info fb_info;

static struct fb_var_screeninfo maxinefb_defined = {

        .xres =         1024,

        .yres =         768,

        .xres_virtual = 1024,

        .yres_virtual = 768,

        .bits_per_pixel =8,

        .activate =     FB_ACTIVATE_NOW,

        .height =       -1,

        .width =        -1,

        .vmode =        FB_VMODE_NONINTERLACED,

};

static struct fb_fix_screeninfo maxinefb_fix = {

        .id =           "Maxine",

        .smem_len =     (1024*768),

        .type =         FB_TYPE_PACKED_PIXELS,

        .visual =       FB_VISUAL_PSEUDOCOLOR,

        .line_length =  1024,

};

/* Handle the funny Inmos RamDAC/video controller ... */

void maxinefb_ims332_write_register(int regno, register unsigned int val)

{

        register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;

        unsigned char *wptr;

        wptr = regs + 0xa0000 + (regno << 4);

        *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;

        *((volatile unsigned short *) (wptr)) = val;

}

unsigned int maxinefb_ims332_read_register(int regno)

{

        register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;

        unsigned char *rptr;

        register unsigned int j, k;

        rptr = regs + 0x80000 + (regno << 4);

        j = *((volatile unsigned short *) rptr);

        k = *((volatile unsigned short *) regs);

        return (j & 0xffff) | ((k & 0xff00) << 8);

}

/* Set the palette */

static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,

                              unsigned blue, unsigned transp, struct fb_info *info)

{

        /* value to be written into the palette reg. */

        unsigned long hw_colorvalue = 0;

        red   >>= 8;    /* The cmap fields are 16 bits    */

        green >>= 8;    /* wide, but the harware colormap */

        blue  >>= 8;    /* registers are only 8 bits wide */

        hw_colorvalue = (blue << 16) + (green << 8) + (red);

        maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,

                                       hw_colorvalue);

        return 0;

}

static struct fb_ops maxinefb_ops = {

        .owner          = THIS_MODULE,

        .fb_setcolreg   = maxinefb_setcolreg,

        .fb_fillrect    = cfb_fillrect,

        .fb_copyarea    = cfb_copyarea,

        .fb_imageblit   = cfb_imageblit,

};

int __init maxinefb_init(void)

{

        unsigned long fboff;

        unsigned long fb_start;

        int i;

        if (fb_get_options("maxinefb", NULL))

                return -ENODEV;

        /* Validate we're on the proper machine type */

        if (mips_machtype != MACH_DS5000_XX) {

                return -EINVAL;

        }

        printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");

        printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");

        /* Framebuffer display memory base address */

        fb_start = DS5000_xx_ONBOARD_FBMEM_START;

        /* Clear screen */

        for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)

                *(volatile unsigned char *)fboff = 0x0;

        maxinefb_fix.smem_start = fb_start;

        /* erase hardware cursor */

        for (i = 0; i < 512; i++) {

                maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,

                                               0);

                /*

                   if (i&0x8 == 0)

                   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);

                   else

                   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);

                 */

        }

        fb_info.fbops = &maxinefb_ops;

        fb_info.screen_base = (char *)maxinefb_fix.smem_start;

        fb_info.var = maxinefb_defined;

        fb_info.fix = maxinefb_fix;

        fb_info.flags = FBINFO_DEFAULT;

        fb_alloc_cmap(&fb_info.cmap, 256, 0);

        if (register_framebuffer(&fb_info) < 0)

                return 1;

        return 0;

}

static void __exit maxinefb_exit(void)

{

        unregister_framebuffer(&fb_info);

}

#ifdef MODULE

MODULE_LICENSE("GPL");

#endif

module_init(maxinefb_init);

module_exit(maxinefb_exit);