summaryrefslogtreecommitdiffstats
path: root/drivers/pcmcia/pxa2xx_palmtc.c
blob: d0ad6a76bbde26812f764c4b8f8cd73cf7c9ba79 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
/*
 * 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 = IRQ_GPIO(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 void palmtc_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
{
}

static void palmtc_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
{
}

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,

	.socket_init		= palmtc_pcmcia_socket_init,
	.socket_suspend		= palmtc_pcmcia_socket_suspend,
};

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");
OpenPOWER on IntegriCloud