/*
   * linux/drivers/pcmcia/pxa2xx_palmtc.c
   *
   * Driver for Palm Tungsten|C PCMCIA
   *
   * Copyright (C) 2008 Alex Osborne <ato@meshy.org>

   * Copyright (C) 2009-2011 Marek Vasut <marek.vasut@gmail.com>

   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   */
  
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/gpio.h>
  #include <linux/delay.h>
  
  #include <asm/mach-types.h>
  #include <mach/palmtc.h>
  #include "soc_common.h"

  static struct gpio palmtc_pcmcia_gpios[] = {
  	{ GPIO_NR_PALMTC_PCMCIA_POWER1,	GPIOF_INIT_LOW,	"PCMCIA Power 1" },
  	{ GPIO_NR_PALMTC_PCMCIA_POWER2,	GPIOF_INIT_LOW,	"PCMCIA Power 2" },
  	{ GPIO_NR_PALMTC_PCMCIA_POWER3,	GPIOF_INIT_LOW,	"PCMCIA Power 3" },
  	{ GPIO_NR_PALMTC_PCMCIA_RESET,	GPIOF_INIT_HIGH,"PCMCIA Reset" },
  	{ GPIO_NR_PALMTC_PCMCIA_READY,	GPIOF_IN,	"PCMCIA Ready" },
  	{ GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN,	"PCMCIA Power Ready" },
  };

  static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  {
  	int ret;

  	ret = gpio_request_array(palmtc_pcmcia_gpios,
  				ARRAY_SIZE(palmtc_pcmcia_gpios));

  	skt->socket.pci_irq = gpio_to_irq(GPIO_NR_PALMTC_PCMCIA_READY);

  	return ret;
  }
  
  static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  {

  	gpio_free_array(palmtc_pcmcia_gpios, ARRAY_SIZE(palmtc_pcmcia_gpios));

  }
  
  static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  					struct pcmcia_state *state)
  {
  	state->detect = 1; /* always inserted */
  	state->ready  = !!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_READY);
  	state->bvd1   = 1;
  	state->bvd2   = 1;
  	state->wrprot = 0;
  	state->vs_3v  = 1;
  	state->vs_Xv  = 0;
  }
  
  static int palmtc_wifi_powerdown(void)
  {
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
  	mdelay(40);
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
  	return 0;
  }
  
  static int palmtc_wifi_powerup(void)
  {
  	int timeout = 50;
  
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
  	mdelay(50);
  
  	/* Power up the card, 1.8V first, after a while 3.3V */
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 1);
  	mdelay(100);
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 1);
  
  	/* Wait till the card is ready */
  	while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
  		timeout) {
  		mdelay(1);
  		timeout--;
  	}
  
  	/* Power down the WiFi in case of error */
  	if (!timeout) {
  		palmtc_wifi_powerdown();
  		return 1;
  	}
  
  	/* Reset the card */
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
  	mdelay(20);
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 0);
  	mdelay(25);
  
  	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
  
  	return 0;
  }
  
  static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  					const socket_state_t *state)
  {

  	int ret = 1;

  
  	if (state->Vcc == 0)
  		ret = palmtc_wifi_powerdown();
  	else if (state->Vcc == 33)
  		ret = palmtc_wifi_powerup();
  
  	return ret;
  }

  static struct pcmcia_low_level palmtc_pcmcia_ops = {
  	.owner			= THIS_MODULE,
  
  	.first			= 0,
  	.nr			= 1,
  
  	.hw_init		= palmtc_pcmcia_hw_init,
  	.hw_shutdown		= palmtc_pcmcia_hw_shutdown,
  
  	.socket_state		= palmtc_pcmcia_socket_state,
  	.configure_socket	= palmtc_pcmcia_configure_socket,

  };
  
  static struct platform_device *palmtc_pcmcia_device;
  
  static int __init palmtc_pcmcia_init(void)
  {
  	int ret;
  
  	if (!machine_is_palmtc())
  		return -ENODEV;
  
  	palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
  	if (!palmtc_pcmcia_device)
  		return -ENOMEM;
  
  	ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
  					sizeof(palmtc_pcmcia_ops));
  
  	if (!ret)
  		ret = platform_device_add(palmtc_pcmcia_device);
  
  	if (ret)
  		platform_device_put(palmtc_pcmcia_device);
  
  	return ret;
  }
  
  static void __exit palmtc_pcmcia_exit(void)
  {
  	platform_device_unregister(palmtc_pcmcia_device);
  }
  
  module_init(palmtc_pcmcia_init);
  module_exit(palmtc_pcmcia_exit);
  
  MODULE_AUTHOR("Alex Osborne <ato@meshy.org>,"
  	    " Marek Vasut <marek.vasut@gmail.com>");
  MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
  MODULE_ALIAS("platform:pxa2xx-pcmcia");
  MODULE_LICENSE("GPL");