/* Copyright (c) 2006 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Neither the name of the Advanced Micro Devices, Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 * */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/* Includes that are used by all drivers */
#include <xf86.h>
#include <xf86_OSproc.h>
#include <xf86_ansic.h>
#include <xf86_libc.h>
#include <xf86Resources.h>
#include <xf86_ansic.h>
#include <compiler.h>

#include "amd.h"

/* OLPC board revision */

#define REV_TESTA 0
#define REV_TESTB 1

/* Values in the embedded controller */

#define TESTA_REVISION 0x09
#define EC_VER_CMD 0x09

/* This is a special color map used for video in the GX engine */
/* on a rev-B DCON, this should be adjusted */

extern unsigned long gfx_gamma_ram_redcloud[];

/* Get the current board revision in a roundabout way by querying the
   embedded controller 
*/

static int
eccmd(ScrnInfoPtr pScrni, unsigned char cmd)
{

    unsigned char ret;
    int i;

    ret = inb(0x6c);

    if (ret & 1)
	ret = inb(0x68);

    /* Write the command */
    outb(0x6C, cmd);

    /* Wait for the 2 response */
    for (i = 0; i < 1000; i++) {
	ret = inb(0x6C);
	if ((ret & 3) == 1)
	    break;
    }

    if (i == 100) {
	xf86DrvMsg(pScrni->scrnIndex, X_ERROR,
	    "Error waiting for the EC command (%x)\n", ret);
	ret = -1;
	goto eread;
    }

    /* get the response */
    ret = inb(0x68);

  eread:
    /* Clear the "ownership flag" */
    outb(0x6C, 0xFF);
    return ret;
}

static int
boardrev(ScrnInfoPtr pScrni)
{
    int i, ret;

    ret = eccmd(pScrni, 0x09);

    if (ret == -1)
	return -1;

    return ret == TESTA_REVISION ? REV_TESTA : REV_TESTB;
}

#define RTC_BASE_PORT 0x70
#define RTC_PORT(x)     (RTC_BASE_PORT + (x))

static inline char
cmos_read(unsigned char addr)
{
    outb(RTC_PORT(0), addr);
    return inb(RTC_PORT(1));
}

static inline void
cmos_write(unsigned char val, unsigned char addr)
{
    outb(RTC_PORT(0), addr);
    outb(RTC_PORT(1), val);
}

static int
dcon_avail(void)
{
    return cmos_read(440 / 8) & 1;
}

Bool
gx_dcon_init(ScrnInfoPtr pScrni)
{
    GeodeRec *pGeode = GEODEPTR(pScrni);
    int rev = boardrev(pScrni);
    int i;

    if (rev == -1) {
	xf86DrvMsg(pScrni->scrnIndex, X_DEFAULT,
	    "This is not an OLPC board\n");
	return FALSE;
    }
    if (dcon_avail() == 0) {
	xf86DrvMsg(pScrni->scrnIndex, X_DEFAULT, "No DCON is present\n");
	return FALSE;
    }

    xf86DrvMsg(pScrni->scrnIndex, X_DEFAULT, "OLPC board revision %s\n",
	rev == REV_TESTB ? "testB" : "testA");
    xf86DrvMsg(pScrni->scrnIndex, X_DEFAULT, "DCON detected.\n");

    /* Panel size setup */
    pGeode->PanelX = DCON_DEFAULT_XRES;
    pGeode->PanelY = DCON_DEFAULT_YRES;

    /* FIXME:  Mode setup should go here */
    /* FIXME:  Controller setup should go here */

    /* Update the Xv map on a rev-b board */

    if (rev == REV_TESTB) {
	for (i = 0; i < 256; i++) {
	    unsigned char r, g, b;

	    r = (gfx_gamma_ram_redcloud[i] >> 16) & 0xFF;
	    g = (gfx_gamma_ram_redcloud[i] >> 8) & 0xFF;
	    b = gfx_gamma_ram_redcloud[i] & 0xFF;

	    gfx_gamma_ram_redcloud[i] =
		((r >> 2) << 16) | ((g >> 1) << 8) | (b >> 2);
	}
    }

    return TRUE;
}