drivers/pcmcia/pxa2xx_palmtc.c

   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
  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_READY,  GPIOF_IN,       "PCMCIA Ready" },
  30         { GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN,     "PCMCIA Power Ready" },
  31 };
  32
  33 static 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
  45 static 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
  50 static 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
  62 static 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
  71 static 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
 107 static 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
 120 static 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
 133 static struct platform_device *palmtc_pcmcia_device;
 134
 135 static 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
 158 static void __exit palmtc_pcmcia_exit(void)
 159 {
 160         platform_device_unregister(palmtc_pcmcia_device);
 161 }
 162
 163 module_init(palmtc_pcmcia_init);
 164 module_exit(palmtc_pcmcia_exit);
 165
 166 MODULE_AUTHOR("Alex Osborne <ato@meshy.org>,"
 167             " Marek Vasut <marek.vasut@gmail.com>");
 168 MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
 169 MODULE_ALIAS("platform:pxa2xx-pcmcia");
 170 MODULE_LICENSE("GPL");