tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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");