linux/drivers/pcmcia/pxa2xx_stargate2.c
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   1/*
   2 * linux/drivers/pcmcia/pxa2xx_stargate2.c
   3 *
   4 * Stargate 2 PCMCIA specific routines.
   5 *
   6 * Created:     December 6, 2005
   7 * Author:      Ed C. Epp
   8 * Copyright:   Intel Corp 2005
   9 *              Jonathan Cameron <jic23@cam.ac.uk> 2009
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License version 2 as
  13 * published by the Free Software Foundation.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/kernel.h>
  19#include <linux/interrupt.h>
  20#include <linux/delay.h>
  21#include <linux/platform_device.h>
  22#include <linux/gpio.h>
  23
  24#include <pcmcia/ss.h>
  25
  26#include <asm/irq.h>
  27#include <asm/mach-types.h>
  28
  29#include "soc_common.h"
  30
  31#define SG2_S0_POWER_CTL        108
  32#define SG2_S0_GPIO_RESET       82
  33#define SG2_S0_GPIO_DETECT      53
  34#define SG2_S0_GPIO_READY       81
  35
  36static struct pcmcia_irqs irqs[] = {
  37        {.sock = 0, .str = "PCMCIA0 CD" },
  38};
  39
  40static struct gpio sg2_pcmcia_gpios[] = {
  41        { SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
  42        { SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
  43};
  44
  45static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  46{
  47        skt->socket.pci_irq = gpio_to_irq(SG2_S0_GPIO_READY);
  48        irqs[0].irq = gpio_to_irq(SG2_S0_GPIO_DETECT);
  49
  50        return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  51}
  52
  53static void sg2_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  54{
  55        soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  56}
  57
  58static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  59                                    struct pcmcia_state *state)
  60{
  61        state->detect = !gpio_get_value(SG2_S0_GPIO_DETECT);
  62        state->ready  = !!gpio_get_value(SG2_S0_GPIO_READY);
  63        state->bvd1   = 0; /* not available - battery detect on card */
  64        state->bvd2   = 0; /* not available */
  65        state->vs_3v  = 1; /* not available - voltage detect for card */
  66        state->vs_Xv  = 0; /* not available */
  67        state->wrprot = 0; /* not available - write protect */
  68}
  69
  70static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  71                                       const socket_state_t *state)
  72{
  73        /* Enable card power */
  74        switch (state->Vcc) {
  75        case 0:
  76                /* sets power ctl register high */
  77                gpio_set_value(SG2_S0_POWER_CTL, 1);
  78                break;
  79        case 33:
  80        case 50:
  81                /* sets power control register low (clear) */
  82                gpio_set_value(SG2_S0_POWER_CTL, 0);
  83                msleep(100);
  84                break;
  85        default:
  86                pr_err("%s(): bad Vcc %u\n",
  87                       __func__, state->Vcc);
  88                return -1;
  89        }
  90
  91        /* reset */
  92        gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
  93
  94        return 0;
  95}
  96
  97static void sg2_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
  98{
  99        soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
 100}
 101
 102static void sg2_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 103{
 104        soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
 105}
 106
 107static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
 108        .owner                  = THIS_MODULE,
 109        .hw_init                = sg2_pcmcia_hw_init,
 110        .hw_shutdown            = sg2_pcmcia_hw_shutdown,
 111        .socket_state           = sg2_pcmcia_socket_state,
 112        .configure_socket       = sg2_pcmcia_configure_socket,
 113        .socket_init            = sg2_pcmcia_socket_init,
 114        .socket_suspend         = sg2_pcmcia_socket_suspend,
 115        .nr                     = 1,
 116};
 117
 118static struct platform_device *sg2_pcmcia_device;
 119
 120static int __init sg2_pcmcia_init(void)
 121{
 122        int ret;
 123
 124        if (!machine_is_stargate2())
 125                return -ENODEV;
 126
 127        sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 128        if (!sg2_pcmcia_device)
 129                return -ENOMEM;
 130
 131        ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 132        if (ret)
 133                goto error_put_platform_device;
 134
 135        ret = platform_device_add_data(sg2_pcmcia_device,
 136                                       &sg2_pcmcia_ops,
 137                                       sizeof(sg2_pcmcia_ops));
 138        if (ret)
 139                goto error_free_gpios;
 140
 141        ret = platform_device_add(sg2_pcmcia_device);
 142        if (ret)
 143                goto error_free_gpios;
 144
 145        return 0;
 146error_free_gpios:
 147        gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 148error_put_platform_device:
 149        platform_device_put(sg2_pcmcia_device);
 150
 151        return ret;
 152}
 153
 154static void __exit sg2_pcmcia_exit(void)
 155{
 156        platform_device_unregister(sg2_pcmcia_device);
 157        gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 158}
 159
 160fs_initcall(sg2_pcmcia_init);
 161module_exit(sg2_pcmcia_exit);
 162
 163MODULE_LICENSE("GPL");
 164MODULE_ALIAS("platform:pxa2xx-pcmcia");
 165