1/*
  2 * linux/drivers/pcmcia/pxa2xx_palmtc.c
  3 *
  4 * Driver for Palm Tungsten|C PCMCIA
  5 *
  6 * Copyright (C) 2008 Alex Osborne <ato@meshy.org>
  7 * Copyright (C) 2009-2011 Marek Vasut <marek.vasut@gmail.com>
  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
 24static 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" },
 29	{ GPIO_NR_PALMTC_PCMCIA_READY,	GPIOF_IN,	"PCMCIA Ready" },
 30	{ GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN,	"PCMCIA Power Ready" },
 31};
 32
 33static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
 34{
 35	int ret;
 36
 37	ret = gpio_request_array(palmtc_pcmcia_gpios,
 38				ARRAY_SIZE(palmtc_pcmcia_gpios));
 39
 40	skt->socket.pci_irq = IRQ_GPIO(GPIO_NR_PALMTC_PCMCIA_READY);
 41
 42	return ret;
 43}
 44
 45static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
 46{
 47	gpio_free_array(palmtc_pcmcia_gpios, ARRAY_SIZE(palmtc_pcmcia_gpios));
 48}
 49
 50static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
 51					struct pcmcia_state *state)
 52{
 53	state->detect = 1; /* always inserted */
 54	state->ready  = !!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_READY);
 55	state->bvd1   = 1;
 56	state->bvd2   = 1;
 57	state->wrprot = 0;
 58	state->vs_3v  = 1;
 59	state->vs_Xv  = 0;
 60}
 61
 62static int palmtc_wifi_powerdown(void)
 63{
 64	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
 65	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
 66	mdelay(40);
 67	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
 68	return 0;
 69}
 70
 71static int palmtc_wifi_powerup(void)
 72{
 73	int timeout = 50;
 74
 75	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
 76	mdelay(50);
 77
 78	/* Power up the card, 1.8V first, after a while 3.3V */
 79	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 1);
 80	mdelay(100);
 81	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 1);
 82
 83	/* Wait till the card is ready */
 84	while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
 85		timeout) {
 86		mdelay(1);
 87		timeout--;
 88	}
 89
 90	/* Power down the WiFi in case of error */
 91	if (!timeout) {
 92		palmtc_wifi_powerdown();
 93		return 1;
 94	}
 95
 96	/* Reset the card */
 97	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
 98	mdelay(20);
 99	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 0);
100	mdelay(25);
101
102	gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
103
104	return 0;
105}
106
107static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
108					const socket_state_t *state)
109{
110	int ret = 1;
111
112	if (state->Vcc == 0)
113		ret = palmtc_wifi_powerdown();
114	else if (state->Vcc == 33)
115		ret = palmtc_wifi_powerup();
116
117	return ret;
118}
119
120static struct pcmcia_low_level palmtc_pcmcia_ops = {
121	.owner			= THIS_MODULE,
122
123	.first			= 0,
124	.nr			= 1,
125
126	.hw_init		= palmtc_pcmcia_hw_init,
127	.hw_shutdown		= palmtc_pcmcia_hw_shutdown,
128
129	.socket_state		= palmtc_pcmcia_socket_state,
130	.configure_socket	= palmtc_pcmcia_configure_socket,
131};
132
133static struct platform_device *palmtc_pcmcia_device;
134
135static int __init palmtc_pcmcia_init(void)
136{
137	int ret;
138
139	if (!machine_is_palmtc())
140		return -ENODEV;
141
142	palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
143	if (!palmtc_pcmcia_device)
144		return -ENOMEM;
145
146	ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
147					sizeof(palmtc_pcmcia_ops));
148
149	if (!ret)
150		ret = platform_device_add(palmtc_pcmcia_device);
151
152	if (ret)
153		platform_device_put(palmtc_pcmcia_device);
154
155	return ret;
156}
157
158static void __exit palmtc_pcmcia_exit(void)
159{
160	platform_device_unregister(palmtc_pcmcia_device);
161}
162
163module_init(palmtc_pcmcia_init);
164module_exit(palmtc_pcmcia_exit);
165
166MODULE_AUTHOR("Alex Osborne <ato@meshy.org>,"
167	    " Marek Vasut <marek.vasut@gmail.com>");
168MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
169MODULE_ALIAS("platform:pxa2xx-pcmcia");
170MODULE_LICENSE("GPL");