/*
 *
 * Alchemy Semi Au1000 pcmcia driver
 *
 * Copyright 2001-2003 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *         	ppopov@embeddedalley.com or source@mvista.com
 *
 * Copyright 2004 Pete Popov, Embedded Alley Solutions, Inc.
 * Updated the driver to 2.6. Followed the sa11xx API and largely
 * copied many of the hardware independent functions.
 *
 * ########################################################################
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope 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.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * ########################################################################
 *
 * 
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/notifier.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>

#include <asm/mach-au1x00/au1000.h>
#include "au1000_generic.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pete Popov <ppopov@embeddedalley.com>");
MODULE_DESCRIPTION("Linux PCMCIA Card Services: Au1x00 Socket Controller");

#if 0
#define debug(x,args...) printk(KERN_DEBUG "%s: " x, __func__ , ##args)
#else
#define debug(x,args...)
#endif

#define MAP_SIZE 0x100000
extern struct au1000_pcmcia_socket au1000_pcmcia_socket[];
#define PCMCIA_SOCKET(x)	(au1000_pcmcia_socket + (x))
#define to_au1000_socket(x)	container_of(x, struct au1000_pcmcia_socket, socket)

/* Some boards like to support CF cards as IDE root devices, so they
 * grab pcmcia sockets directly.
 */
u32 *pcmcia_base_vaddrs[2];
extern const unsigned long mips_io_port_base;

static DEFINE_MUTEX(pcmcia_sockets_lock);

static int (*au1x00_pcmcia_hw_init[])(struct device *dev) = {
	au1x_board_init,
};

static int
au1x00_pcmcia_skt_state(struct au1000_pcmcia_socket *skt)
{
	struct pcmcia_state state;
	unsigned int stat;

	memset(&state, 0, sizeof(struct pcmcia_state));

	skt->ops->socket_state(skt, &state);

	stat = state.detect  ? SS_DETECT : 0;
	stat |= state.ready  ? SS_READY  : 0;
	stat |= state.wrprot ? SS_WRPROT : 0;
	stat |= state.vs_3v  ? SS_3VCARD : 0;
	stat |= state.vs_Xv  ? SS_XVCARD : 0;
	stat |= skt->cs_state.Vcc ? SS_POWERON : 0;

	if (skt->cs_state.flags & SS_IOCARD)
		stat |= state.bvd1 ? SS_STSCHG : 0;
	else {
		if (state.bvd1 == 0)
			stat |= SS_BATDEAD;
		else if (state.bvd2 == 0)
			stat |= SS_BATWARN;
	}
	return stat;
}

/*
 * au100_pcmcia_config_skt
 *
 * Convert PCMCIA socket state to our socket configure structure.
 */
static int
au1x00_pcmcia_config_skt(struct au1000_pcmcia_socket *skt, socket_state_t *state)
{
	int ret;

	ret = skt->ops->configure_socket(skt, state);
	if (ret == 0) {
		skt->cs_state = *state;
	}

	if (ret < 0)
		debug("unable to configure socket %d\n", skt->nr);

	return ret;
}

/* au1x00_pcmcia_sock_init()
 *
 * (Re-)Initialise the socket, turning on status interrupts
 * and PCMCIA bus.  This must wait for power to stabilise
 * so that the card status signals report correctly.
 *
 * Returns: 0
 */
static int au1x00_pcmcia_sock_init(struct pcmcia_socket *sock)
{
	struct au1000_pcmcia_socket *skt = to_au1000_socket(sock);

	debug("initializing socket %u\n", skt->nr);

	skt->ops->socket_init(skt);
	return 0;
}

/*
 * au1x00_pcmcia_suspend()
 *
 * Remove power on the socket, disable IRQs from the card.
 * Turn off status interrupts, and disable the PCMCIA bus.
 *
 * Returns: 0
 */
static int au1x00_pcmcia_suspend(struct pcmcia_socket *sock)
{
	struct au1000_pcmcia_socket *skt = to_au1000_socket(sock);

	debug("suspending socket %u\n", skt->nr);

	skt->ops->socket_suspend(skt);

	return 0;
}

static DEFINE_SPINLOCK(status_lock);

/*
 * au1x00_check_status()
 */
static void au1x00_check_status(struct au1000_pcmcia_socket *skt)
{
	unsigned int events;

	debug("entering PCMCIA monitoring thread\n");

	do {
		unsigned int status;
		unsigned long flags;

		status = au1x00_pcmcia_skt_state(skt);

		spin_lock_irqsave(&status_lock, flags);
		events = (status ^ skt->status) & skt->cs_state.csc_mask;
		skt->status = status;
		spin_unlock_irqrestore(&status_lock, flags);

		debug("events: %s%s%s%s%s%s\n",
			events == 0         ? "<NONE>"   : "",
			events & SS_DETECT  ? "DETECT "  : "",
			events & SS_READY   ? "READY "   : "",
			events & SS_BATDEAD ? "BATDEAD " : "",
			events & SS_BATWARN ? "BATWARN " : "",
			events & SS_STSCHG  ? "STSCHG "  : "");

		if (events)
			pcmcia_parse_events(&skt->socket, events);
	} while (events);
}

/* 
 * au1x00_pcmcia_poll_event()
 * Let's poll for events in addition to IRQs since IRQ only is unreliable...
 */
static void au1x00_pcmcia_poll_event(unsigned long dummy)
{
	struct au1000_pcmcia_socket *skt = (struct au1000_pcmcia_socket *)dummy;
	debug("polling for events\n");

	mod_timer(&skt->poll_timer, jiffies + AU1000_PCMCIA_POLL_PERIOD);

	au1x00_check_status(skt);
}

/* au1x00_pcmcia_get_status()
 *
 * From the sa11xx_core.c:
 * Implements the get_status() operation for the in-kernel PCMCIA
 * service (formerly SS_GetStatus in Card Services). Essentially just
 * fills in bits in `status' according to internal driver state or
 * the value of the voltage detect chipselect register.
 *
 * As a debugging note, during card startup, the PCMCIA core issues
 * three set_socket() commands in a row the first with RESET deasserted,
 * the second with RESET asserted, and the last with RESET deasserted
 * again. Following the third set_socket(), a get_status() command will
 * be issued. The kernel is looking for the SS_READY flag (see
 * setup_socket(), reset_socket(), and unreset_socket() in cs.c).
 *
 * Returns: 0
 */
static int
au1x00_pcmcia_get_status(struct pcmcia_socket *sock, unsigned int *status)
{
	struct au1000_pcmcia_socket *skt = to_au1000_socket(sock);

	skt->status = au1x00_pcmcia_skt_state(skt);
	*status = skt->status;

	return 0;
}

/* au1x00_pcmcia_set_socket()
 * Implements the set_socket() operation for the in-kernel PCMCIA
 * service (formerly SS_SetSocket in Card Services). We more or
 * less punt all of this work and let the kernel handle the details
 * of power configuration, reset, &c. We also record the value of
 * `state' in order to regurgitate it to the PCMCIA core later.
 *
 * Returns: 0
 */
static int
au1x00_pcmcia_set_socket(struct pcmcia_socket *sock, socket_state_t *state)
{
  struct au1000_pcmcia_socket *skt = to_au1000_socket(sock);

  debug("for sock %u\n", skt->nr);

  debug("\tmask:  %s%s%s%s%s%s\n\tflags: %s%s%s%s%s%s\n",
	(state->csc_mask==0)?"<NONE>":"",
	(state->csc_mask&SS_DETECT)?"DETECT ":"",
	(state->csc_mask&SS_READY)?"READY ":"",
	(state->csc_mask&SS_BATDEAD)?"BATDEAD ":"",
	(state->csc_mask&SS_BATWARN)?"BATWARN ":"",
	(state->csc_mask&SS_STSCHG)?"STSCHG ":"",
	(state->flags==0)?"<NONE>":"",
	(state->flags&SS_PWR_AUTO)?"PWR_AUTO ":"",
	(state->flags&SS_IOCARD)?"IOCARD ":"",
	(state->flags&SS_RESET)?"RESET ":"",
	(state->flags&SS_SPKR_ENA)?"SPKR_ENA ":"",
	(state->flags&SS_OUTPUT_ENA)?"OUTPUT_ENA ":"");
  debug("\tVcc %d  Vpp %d  irq %d\n",
	state->Vcc, state->Vpp, state->io_irq);

  return au1x00_pcmcia_config_skt(skt, state);
}

int 
au1x00_pcmcia_set_io_map(struct pcmcia_socket *sock, struct pccard_io_map *map)
{
	struct au1000_pcmcia_socket *skt = to_au1000_socket(sock);
	unsigned int speed;

	if(map->map>=MAX_IO_WIN){
		debug("map (%d) out of range\n", map->map);
		return -1;
	}

	if(map->flags&MAP_ACTIVE){
		speed=(map->speed>0)?map->speed:AU1000_PCMCIA_IO_SPEED;
		skt->spd_io[map->map] = speed;
	}

	map->start=(unsigned int)(u32)skt->virt_io;
	map->stop=map->start+MAP_SIZE;
	return 0;

}  /* au1x00_pcmcia_set_io_map() */


static int 
au1x00_pcmcia_set_mem_map(struct pcmcia_socket *sock, struct pccard_mem_map *map)
{
	struct au1000_pcmcia_socket *skt = to_au1000_socket(sock);
	unsigned short speed = map->speed;

	if(map->map>=MAX_WIN){
		debug("map (%d) out of range\n", map->map);
		return -1;
	}

	if (map->flags & MAP_ATTRIB) {
		skt->spd_attr[map->map] = speed;
		skt->spd_mem[map->map] = 0;
	} else {
		skt->spd_attr[map->map] = 0;
		skt->spd_mem[map->map] = speed;
	}

	if (map->flags & MAP_ATTRIB) {
		map->static_start = skt->phys_attr + map->card_start;
	}
	else {
		map->static_start = skt->phys_mem + map->card_start;
	}

	debug("set_mem_map %d start %08lx card_start %08x\n",
			map->map, map->static_start, map->card_start);
	return 0;

}  /* au1x00_pcmcia_set_mem_map() */

static struct pccard_operations au1x00_pcmcia_operations = {
	.init			= au1x00_pcmcia_sock_init,
	.suspend		= au1x00_pcmcia_suspend,
	.get_status		= au1x00_pcmcia_get_status,
	.set_socket		= au1x00_pcmcia_set_socket,
	.set_io_map		= au1x00_pcmcia_set_io_map,
	.set_mem_map		= au1x00_pcmcia_set_mem_map,
};

static const char *skt_names[] = {
	"PCMCIA socket 0",
	"PCMCIA socket 1",
};

struct skt_dev_info {
	int nskt;
};

int au1x00_pcmcia_socket_probe(struct device *dev, struct pcmcia_low_level *ops, int first, int nr)
{
	struct skt_dev_info *sinfo;
	struct au1000_pcmcia_socket *skt;
	int ret, i;

	sinfo = kzalloc(sizeof(struct skt_dev_info), GFP_KERNEL);
	if (!sinfo) {
		ret = -ENOMEM;
		goto out;
	}

	sinfo->nskt = nr;

	/*
	 * Initialise the per-socket structure.
	 */
	for (i = 0; i < nr; i++) {
		skt = PCMCIA_SOCKET(i);
		memset(skt, 0, sizeof(*skt));

		skt->socket.resource_ops = &pccard_static_ops;
		skt->socket.ops = &au1x00_pcmcia_operations;
		skt->socket.owner = ops->owner;
		skt->socket.dev.parent = dev;

		init_timer(&skt->poll_timer);
		skt->poll_timer.function = au1x00_pcmcia_poll_event;
		skt->poll_timer.data = (unsigned long)skt;
		skt->poll_timer.expires = jiffies + AU1000_PCMCIA_POLL_PERIOD;

		skt->nr		= first + i;
		skt->irq	= 255;
		skt->dev	= dev;
		skt->ops	= ops;

		skt->res_skt.name	= skt_names[skt->nr];
		skt->res_io.name	= "io";
		skt->res_io.flags	= IORESOURCE_MEM | IORESOURCE_BUSY;
		skt->res_mem.name	= "memory";
		skt->res_mem.flags	= IORESOURCE_MEM;
		skt->res_attr.name	= "attribute";
		skt->res_attr.flags	= IORESOURCE_MEM;

		/*
		 * PCMCIA client drivers use the inb/outb macros to access the
		 * IO registers. Since mips_io_port_base is added to the
		 * access address of the mips implementation of inb/outb,
		 * we need to subtract it here because we want to access the
		 * I/O or MEM address directly, without going through this
		 * "mips_io_port_base" mechanism.
		 */
		if (i == 0) {
			skt->virt_io = (void *)
				(ioremap((phys_t)AU1X_SOCK0_IO, 0x1000) -
				(u32)mips_io_port_base);
			skt->phys_attr = AU1X_SOCK0_PHYS_ATTR;
			skt->phys_mem = AU1X_SOCK0_PHYS_MEM;
		}
		else  {
			skt->virt_io = (void *)
				(ioremap((phys_t)AU1X_SOCK1_IO, 0x1000) -
				(u32)mips_io_port_base);
			skt->phys_attr = AU1X_SOCK1_PHYS_ATTR;
			skt->phys_mem = AU1X_SOCK1_PHYS_MEM;
		}
		pcmcia_base_vaddrs[i] = (u32 *)skt->virt_io;
		ret = ops->hw_init(skt);

		skt->socket.features = SS_CAP_STATIC_MAP|SS_CAP_PCCARD;
		skt->socket.irq_mask = 0;
		skt->socket.map_size = MAP_SIZE;
		skt->socket.pci_irq = skt->irq;
		skt->socket.io_offset = (unsigned long)skt->virt_io;

		skt->status = au1x00_pcmcia_skt_state(skt);

		ret = pcmcia_register_socket(&skt->socket);
		if (ret)
			goto out_err;

		WARN_ON(skt->socket.sock != i);

		add_timer(&skt->poll_timer);
	}

	dev_set_drvdata(dev, sinfo);
	return 0;


out_err:
	ops->hw_shutdown(skt);
	while (i-- > 0) {
		skt = PCMCIA_SOCKET(i);

		del_timer_sync(&skt->poll_timer);
		pcmcia_unregister_socket(&skt->socket);
		if (i == 0) {
			iounmap(skt->virt_io + (u32)mips_io_port_base);
			skt->virt_io = NULL;
		}
#ifndef CONFIG_MIPS_XXS1500
		else {
			iounmap(skt->virt_io + (u32)mips_io_port_base);
			skt->virt_io = NULL;
		}
#endif
		ops->hw_shutdown(skt);

	}
	kfree(sinfo);
out:
	return ret;
}

int au1x00_drv_pcmcia_remove(struct platform_device *dev)
{
	struct skt_dev_info *sinfo = platform_get_drvdata(dev);
	int i;

	mutex_lock(&pcmcia_sockets_lock);
	platform_set_drvdata(dev, NULL);

	for (i = 0; i < sinfo->nskt; i++) {
		struct au1000_pcmcia_socket *skt = PCMCIA_SOCKET(i);

		del_timer_sync(&skt->poll_timer);
		pcmcia_unregister_socket(&skt->socket);
		skt->ops->hw_shutdown(skt);
		au1x00_pcmcia_config_skt(skt, &dead_socket);
		iounmap(skt->virt_io + (u32)mips_io_port_base);
		skt->virt_io = NULL;
	}

	kfree(sinfo);
	mutex_unlock(&pcmcia_sockets_lock);
	return 0;
}


/*
 * PCMCIA "Driver" API
 */

static int au1x00_drv_pcmcia_probe(struct platform_device *dev)
{
	int i, ret = -ENODEV;

	mutex_lock(&pcmcia_sockets_lock);
	for (i=0; i < ARRAY_SIZE(au1x00_pcmcia_hw_init); i++) {
		ret = au1x00_pcmcia_hw_init[i](&dev->dev);
		if (ret == 0)
			break;
	}
	mutex_unlock(&pcmcia_sockets_lock);
	return ret;
}

static struct platform_driver au1x00_pcmcia_driver = {
	.driver = {
		.name		= "au1x00-pcmcia",
		.owner		= THIS_MODULE,
	},
	.probe		= au1x00_drv_pcmcia_probe,
	.remove		= au1x00_drv_pcmcia_remove,
};


/* au1x00_pcmcia_init()
 *
 * This routine performs low-level PCMCIA initialization and then
 * registers this socket driver with Card Services.
 *
 * Returns: 0 on success, -ve error code on failure
 */
static int __init au1x00_pcmcia_init(void)
{
	int error = 0;
	error = platform_driver_register(&au1x00_pcmcia_driver);
	return error;
}

/* au1x00_pcmcia_exit()
 * Invokes the low-level kernel service to free IRQs associated with this
 * socket controller and reset GPIO edge detection.
 */
static void __exit au1x00_pcmcia_exit(void)
{
	platform_driver_unregister(&au1x00_pcmcia_driver);
}

module_init(au1x00_pcmcia_init);
module_exit(au1x00_pcmcia_exit);