/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2000 AG Electronics Ltd.
 * Copyright (C) 2003-2004 Linux Networx
 * Copyright (C) 2004 Tyan
 * Copyright (C) 2005 Digital Design Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

/* RAM-based driver for SMSC LPC47N217 Super I/O chip. */

#include <arch/io.h>
#include <device/device.h>
#include <device/pnp.h>
#include <console/console.h>
#include <device/smbus.h>
#include <string.h>
#include <uart8250.h>
#include <assert.h>
#include <stdlib.h>
#include "lpc47n217.h"

/* Forward declarations */
static void enable_dev(device_t dev);
static void lpc47n217_pnp_set_resources(device_t dev);
static void lpc47n217_pnp_enable_resources(device_t dev);
static void lpc47n217_pnp_enable(device_t dev);
static void lpc47n217_init(device_t dev);
static void lpc47n217_pnp_set_resource(device_t dev, struct resource *resource);
static void lpc47n217_pnp_set_iobase(device_t dev, u16 iobase);
static void lpc47n217_pnp_set_drq(device_t dev, u8 drq);
static void lpc47n217_pnp_set_irq(device_t dev, u8 irq);
static void lpc47n217_pnp_set_enable(device_t dev, int enable);
static void pnp_enter_conf_state(device_t dev);
static void pnp_exit_conf_state(device_t dev);

struct chip_operations superio_smsc_lpc47n217_ops = {
	CHIP_NAME("SMSC LPC47N217 Super I/O")
	.enable_dev = enable_dev,
};

static struct device_operations ops = {
	.read_resources   = pnp_read_resources,
	.set_resources    = lpc47n217_pnp_set_resources,
	.enable_resources = lpc47n217_pnp_enable_resources,
	.enable           = lpc47n217_pnp_enable,
	.init             = lpc47n217_init,
};

static struct pnp_info pnp_dev_info[] = {
	{ &ops, LPC47N217_PP,   PNP_IO0 | PNP_IRQ0 | PNP_DRQ0, {0x07f8, 0}, },
	{ &ops, LPC47N217_SP1,  PNP_IO0 | PNP_IRQ0, {0x07f8, 0}, },
	{ &ops, LPC47N217_SP2,  PNP_IO0 | PNP_IRQ0, {0x07f8, 0}, }
};

/**
 * Create device structures and allocate resources to devices specified in the
 * pnp_dev_info array (above).
 *
 * @param dev Pointer to structure describing a Super I/O device.
 */
static void enable_dev(device_t dev)
{
	pnp_enable_devices(dev, &pnp_ops, ARRAY_SIZE(pnp_dev_info),
			   pnp_dev_info);
}

/**
 * Configure the specified Super I/O device with the resources (I/O space,
 * etc.) that have been allocate for it.
 *
 * NOTE: Cannot use pnp_set_resources() here because it assumes chip
 * support for logical devices, which the LPC47N217 doesn't have.
 *
 * @param dev Pointer to structure describing a Super I/O device.
 */
static void lpc47n217_pnp_set_resources(device_t dev)
{
	struct resource *res;

	pnp_enter_conf_state(dev);
	for (res = dev->resource_list; res; res = res->next)
		lpc47n217_pnp_set_resource(dev, res);
	/* dump_pnp_device(dev); */
   	pnp_exit_conf_state(dev);
}

/*
 * NOTE: Cannot use pnp_enable_resources() here because it assumes chip
 * support for logical devices, which the LPC47N217 doesn't have.
 */
static void lpc47n217_pnp_enable_resources(device_t dev)
{
	pnp_enter_conf_state(dev);
	lpc47n217_pnp_set_enable(dev, 1);
	pnp_exit_conf_state(dev);
}

/*
 * NOTE: Cannot use pnp_set_enable() here because it assumes chip
 * support for logical devices, which the LPC47N217 doesn't have.
 */
static void lpc47n217_pnp_enable(device_t dev)
{
	pnp_enter_conf_state(dev);
	lpc47n217_pnp_set_enable(dev, !!dev->enabled);
	pnp_exit_conf_state(dev);
}

/**
 * Initialize the specified Super I/O device.
 *
 * Devices other than COM ports are ignored. For COM ports, we configure the
 * baud rate.
 *
 * @param dev Pointer to structure describing a Super I/O device.
 */
static void lpc47n217_init(device_t dev)
{
	if (!dev->enabled)
		return;
}

static void lpc47n217_pnp_set_resource(device_t dev, struct resource *resource)
{
	if (!(resource->flags & IORESOURCE_ASSIGNED)) {
		printk(BIOS_ERR, "ERROR: %s %02lx not allocated\n",
		       dev_path(dev), resource->index);
		return;
	}

	/* Now store the resource. */

	/*
	 * NOTE: Cannot use pnp_set_XXX() here because they assume chip
	 * support for logical devices, which the LPC47N217 doesn't have.
	 */
	if (resource->flags & IORESOURCE_IO) {
		lpc47n217_pnp_set_iobase(dev, resource->base);
	} else if (resource->flags & IORESOURCE_DRQ) {
		lpc47n217_pnp_set_drq(dev, resource->base);
	} else if (resource->flags & IORESOURCE_IRQ) {
		lpc47n217_pnp_set_irq(dev, resource->base);
	} else {
		printk(BIOS_ERR, "ERROR: %s %02lx unknown resource type\n",
		       dev_path(dev), resource->index);
		return;
	}
	resource->flags |= IORESOURCE_STORED;

	report_resource_stored(dev, resource, "");
}

static void lpc47n217_pnp_set_iobase(device_t dev, u16 iobase)
{
	ASSERT(!(iobase & 0x3));

	switch(dev->path.pnp.device) {
	case LPC47N217_PP:
		pnp_write_config(dev, 0x23, (iobase >> 2) & 0xff);
		break;
	case LPC47N217_SP1:
		pnp_write_config(dev, 0x24, (iobase >> 2) & 0xff);
		break;
	case LPC47N217_SP2:
		pnp_write_config(dev, 0x25, (iobase >> 2) & 0xff);
		break;
	default:
		BUG();
		break;
	}
}

static void lpc47n217_pnp_set_drq(device_t dev, u8 drq)
{
	const u8 PP_DMA_MASK = 0x0F;
	const u8 PP_DMA_SELECTION_REGISTER = 0x26;
	u8 current_config, new_config;

	if (dev->path.pnp.device == LPC47N217_PP) {
		current_config = pnp_read_config(dev,
						 PP_DMA_SELECTION_REGISTER);
		ASSERT(!(drq & ~PP_DMA_MASK)); /* DRQ out of range? */
		new_config = (current_config & ~PP_DMA_MASK) | drq;
		pnp_write_config(dev, PP_DMA_SELECTION_REGISTER, new_config);
	} else {
		BUG();
	}
}

static void lpc47n217_pnp_set_irq(device_t dev, u8 irq)
{
	u8 irq_config_register = 0, irq_config_mask = 0;
	u8 current_config, new_config;

	switch(dev->path.pnp.device) {
	case LPC47N217_PP:
		irq_config_register = 0x27;
		irq_config_mask = 0x0F;
		break;
	case LPC47N217_SP1:
		irq_config_register = 0x28;
		irq_config_mask = 0xF0;
		irq <<= 4;
		break;
	case LPC47N217_SP2:
		irq_config_register = 0x28;
		irq_config_mask = 0x0F;
		break;
	default:
		BUG();
		return;
	}

	ASSERT(!(irq & ~irq_config_mask)); /* IRQ out of range? */

	current_config = pnp_read_config(dev, irq_config_register);
	new_config = (current_config & ~irq_config_mask) | irq;
	pnp_write_config(dev, irq_config_register, new_config);
}

static void lpc47n217_pnp_set_enable(device_t dev, int enable)
{
	u8 power_register = 0, power_mask = 0, current_power, new_power;

	switch(dev->path.pnp.device) {
	case LPC47N217_PP:
		power_register = 0x01;
		power_mask = 0x04;
		break;
	case LPC47N217_SP1:
		power_register = 0x02;
		power_mask = 0x08;
		break;
	case LPC47N217_SP2:
		power_register = 0x02;
		power_mask = 0x80;
		break;
	default:
		BUG();
		return;
	}

	current_power = pnp_read_config(dev, power_register);
	new_power = current_power & ~power_mask; /* Disable by default. */
	if (enable) {
		struct resource* ioport_resource;
		ioport_resource = find_resource(dev, PNP_IDX_IO0);
		lpc47n217_pnp_set_iobase(dev, ioport_resource->base);
		new_power |= power_mask; /* Enable. */
	} else {
		lpc47n217_pnp_set_iobase(dev, 0);
	}
	pnp_write_config(dev, power_register, new_power);
}

static void pnp_enter_conf_state(device_t dev)
{
	outb(0x55, dev->path.pnp.port);
}

static void pnp_exit_conf_state(device_t dev)
{
	outb(0xaa, dev->path.pnp.port);
}

#if 0
/**
 * Print the values of all of the LPC47N217's configuration registers.
 *
 * NOTE: The LPC47N217 must be in config mode when this function is called.
 *
 * @param dev Pointer to structure describing a Super I/O device.
 */
static void dump_pnp_device(device_t dev)
{
	int i;
	print_debug("\n");

	for (i = 0; i <= LPC47N217_MAX_CONFIG_REGISTER; i++) {
		u8 register_value;

		if ((i & 0x0f) == 0) {
			print_debug_hex8(i);
			print_debug_char(':');
		}

		/*
		 * Skip over 'register' that would cause exit from
		 * configuration mode.
		 */
		if (i == 0xaa)
			register_value = 0xaa;
		else
			register_value = pnp_read_config(dev, i);

		print_debug_char(' ');
		print_debug_hex8(register_value);
		if ((i & 0x0f) == 0x0f)
			print_debug("\n");
	}

	print_debug("\n");
}
#endif