linux/drivers/pcmcia/pxa2xx_palmtc.c
<<
>>
Prefs
   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 = gpio_to_irq(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");
 171