[linux.git] / drivers / pcmcia / pxa2xx_palmtc.c

/*
 * linux/drivers/pcmcia/pxa2xx_palmtc.c
 *
 * Driver for Palm Tungsten|C PCMCIA
 *
 * Copyright (C) 2008 Alex Osborne <[email protected]>
 * Copyright (C) 2009-2011 Marek Vasut <[email protected]>
 *
 * 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_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->stat[SOC_STAT_RDY].gpio = GPIO_NR_PALMTC_PCMCIA_READY;
	skt->stat[SOC_STAT_RDY].name = "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->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 <[email protected]>,"
	    " Marek Vasut <[email protected]>");
MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
MODULE_ALIAS("platform:pxa2xx-pcmcia");
MODULE_LICENSE("GPL");
Commit	Line	Data
36d618be MV	1	/*
	2	* linux/drivers/pcmcia/pxa2xx_palmtc.c
	3	*
	4	* Driver for Palm Tungsten\|C PCMCIA
	5	*
	6	* Copyright (C) 2008 Alex Osborne <[email protected]>
9ed3fbf1	7	* Copyright (C) 2009-2011 Marek Vasut <[email protected]>
36d618be MV	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/gpio.h>
	18	#include <linux/delay.h>
	19
	20	#include <asm/mach-types.h>
	21	#include <mach/palmtc.h>
	22	#include "soc_common.h"
	23
ba388307 MV	24	static struct gpio palmtc_pcmcia_gpios[] = {
	25	{ GPIO_NR_PALMTC_PCMCIA_POWER1, GPIOF_INIT_LOW, "PCMCIA Power 1" },
	26	{ GPIO_NR_PALMTC_PCMCIA_POWER2, GPIOF_INIT_LOW, "PCMCIA Power 2" },
	27	{ GPIO_NR_PALMTC_PCMCIA_POWER3, GPIOF_INIT_LOW, "PCMCIA Power 3" },
	28	{ GPIO_NR_PALMTC_PCMCIA_RESET, GPIOF_INIT_HIGH,"PCMCIA Reset" },
ba388307 MV	29	{ GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN, "PCMCIA Power Ready" },
	30	};
	31
36d618be MV	32	static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
	33	{
	34	int ret;
	35
ba388307 MV	36	ret = gpio_request_array(palmtc_pcmcia_gpios,
ba388307 MV	37	ARRAY_SIZE(palmtc_pcmcia_gpios));
36d618be	38
a9bb5a4b RK	39	skt->stat[SOC_STAT_RDY].gpio = GPIO_NR_PALMTC_PCMCIA_READY;
a9bb5a4b RK	40	skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
36d618be	41
36d618be MV	42	return ret;
	43	}
	44
	45	static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
	46	{
ba388307	47	gpio_free_array(palmtc_pcmcia_gpios, ARRAY_SIZE(palmtc_pcmcia_gpios));
36d618be MV	48	}
	49
	50	static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
	51	struct pcmcia_state *state)
	52	{
	53	state->detect = 1; /* always inserted */
36d618be MV	54	state->vs_3v = 1;
	55	state->vs_Xv = 0;
	56	}
	57
	58	static int palmtc_wifi_powerdown(void)
	59	{
	60	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
	61	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
	62	mdelay(40);
	63	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
	64	return 0;
	65	}
	66
	67	static int palmtc_wifi_powerup(void)
	68	{
	69	int timeout = 50;
	70
	71	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
	72	mdelay(50);
	73
	74	/* Power up the card, 1.8V first, after a while 3.3V */
	75	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 1);
	76	mdelay(100);
	77	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 1);
	78
	79	/* Wait till the card is ready */
	80	while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
	81	timeout) {
	82	mdelay(1);
	83	timeout--;
	84	}
	85
	86	/* Power down the WiFi in case of error */
	87	if (!timeout) {
	88	palmtc_wifi_powerdown();
	89	return 1;
	90	}
	91
	92	/* Reset the card */
	93	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
	94	mdelay(20);
	95	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 0);
	96	mdelay(25);
	97
	98	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
	99
	100	return 0;
	101	}
	102
	103	static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
	104	const socket_state_t *state)
	105	{
6cf4442f	106	int ret = 1;
36d618be MV	107
	108	if (state->Vcc == 0)
	109	ret = palmtc_wifi_powerdown();
	110	else if (state->Vcc == 33)
	111	ret = palmtc_wifi_powerup();
	112
	113	return ret;
	114	}
	115
36d618be MV	116	static struct pcmcia_low_level palmtc_pcmcia_ops = {
	117	.owner = THIS_MODULE,
	118
	119	.first = 0,
	120	.nr = 1,
	121
	122	.hw_init = palmtc_pcmcia_hw_init,
	123	.hw_shutdown = palmtc_pcmcia_hw_shutdown,
	124
	125	.socket_state = palmtc_pcmcia_socket_state,
	126	.configure_socket = palmtc_pcmcia_configure_socket,
36d618be MV	127	};
	128
	129	static struct platform_device *palmtc_pcmcia_device;
	130
	131	static int __init palmtc_pcmcia_init(void)
	132	{
	133	int ret;
	134
	135	if (!machine_is_palmtc())
	136	return -ENODEV;
	137
	138	palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
	139	if (!palmtc_pcmcia_device)
	140	return -ENOMEM;
	141
	142	ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
	143	sizeof(palmtc_pcmcia_ops));
	144
	145	if (!ret)
	146	ret = platform_device_add(palmtc_pcmcia_device);
	147
	148	if (ret)
	149	platform_device_put(palmtc_pcmcia_device);
	150
	151	return ret;
	152	}
	153
	154	static void __exit palmtc_pcmcia_exit(void)
	155	{
	156	platform_device_unregister(palmtc_pcmcia_device);
	157	}
	158
	159	module_init(palmtc_pcmcia_init);
	160	module_exit(palmtc_pcmcia_exit);
	161
	162	MODULE_AUTHOR("Alex Osborne <[email protected]>,"
	163	" Marek Vasut <[email protected]>");
	164	MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten\|C");
	165	MODULE_ALIAS("platform:pxa2xx-pcmcia");
	166	MODULE_LICENSE("GPL");