Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / pcmcia / pxa2xx_palmtc.c
blob81225a7a8cbbdb893bb2b3b163b4d5d8c90683f0
1 /*
2 * linux/drivers/pcmcia/pxa2xx_palmtc.c
4 * Driver for Palm Tungsten|C PCMCIA
6 * Copyright (C) 2008 Alex Osborne <ato@meshy.org>
7 * Copyright (C) 2009-2011 Marek Vasut <marek.vasut@gmail.com>
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.
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/gpio.h>
18 #include <linux/delay.h>
20 #include <asm/mach-types.h>
21 #include <mach/palmtc.h>
22 #include "soc_common.h"
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" },
29 { GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN, "PCMCIA Power Ready" },
32 static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
34 int ret;
36 ret = gpio_request_array(palmtc_pcmcia_gpios,
37 ARRAY_SIZE(palmtc_pcmcia_gpios));
39 skt->stat[SOC_STAT_RDY].gpio = GPIO_NR_PALMTC_PCMCIA_READY;
40 skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
42 return ret;
45 static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
47 gpio_free_array(palmtc_pcmcia_gpios, ARRAY_SIZE(palmtc_pcmcia_gpios));
50 static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
51 struct pcmcia_state *state)
53 state->detect = 1; /* always inserted */
54 state->vs_3v = 1;
55 state->vs_Xv = 0;
58 static int palmtc_wifi_powerdown(void)
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;
67 static int palmtc_wifi_powerup(void)
69 int timeout = 50;
71 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
72 mdelay(50);
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);
79 /* Wait till the card is ready */
80 while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
81 timeout) {
82 mdelay(1);
83 timeout--;
86 /* Power down the WiFi in case of error */
87 if (!timeout) {
88 palmtc_wifi_powerdown();
89 return 1;
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);
98 gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
100 return 0;
103 static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
104 const socket_state_t *state)
106 int ret = 1;
108 if (state->Vcc == 0)
109 ret = palmtc_wifi_powerdown();
110 else if (state->Vcc == 33)
111 ret = palmtc_wifi_powerup();
113 return ret;
116 static struct pcmcia_low_level palmtc_pcmcia_ops = {
117 .owner = THIS_MODULE,
119 .first = 0,
120 .nr = 1,
122 .hw_init = palmtc_pcmcia_hw_init,
123 .hw_shutdown = palmtc_pcmcia_hw_shutdown,
125 .socket_state = palmtc_pcmcia_socket_state,
126 .configure_socket = palmtc_pcmcia_configure_socket,
129 static struct platform_device *palmtc_pcmcia_device;
131 static int __init palmtc_pcmcia_init(void)
133 int ret;
135 if (!machine_is_palmtc())
136 return -ENODEV;
138 palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
139 if (!palmtc_pcmcia_device)
140 return -ENOMEM;
142 ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
143 sizeof(palmtc_pcmcia_ops));
145 if (!ret)
146 ret = platform_device_add(palmtc_pcmcia_device);
148 if (ret)
149 platform_device_put(palmtc_pcmcia_device);
151 return ret;
154 static void __exit palmtc_pcmcia_exit(void)
156 platform_device_unregister(palmtc_pcmcia_device);
159 module_init(palmtc_pcmcia_init);
160 module_exit(palmtc_pcmcia_exit);
162 MODULE_AUTHOR("Alex Osborne <ato@meshy.org>,"
163 " Marek Vasut <marek.vasut@gmail.com>");
164 MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
165 MODULE_ALIAS("platform:pxa2xx-pcmcia");
166 MODULE_LICENSE("GPL");