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 gpio sg2_pcmcia_gpios[] = {
  37        { SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
  38        { SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
  39};
  40
  41static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  42{
  43        skt->stat[SOC_STAT_CD].gpio = SG2_S0_GPIO_DETECT;
  44        skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  45        skt->stat[SOC_STAT_RDY].gpio = SG2_S0_GPIO_READY;
  46        skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
  47        return 0;
  48}
  49
  50static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  51                                    struct pcmcia_state *state)
  52{
  53        state->bvd1   = 0; /* not available - battery detect on card */
  54        state->bvd2   = 0; /* not available */
  55        state->vs_3v  = 1; /* not available - voltage detect for card */
  56        state->vs_Xv  = 0; /* not available */
  57}
  58
  59static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  60                                       const socket_state_t *state)
  61{
  62        /* Enable card power */
  63        switch (state->Vcc) {
  64        case 0:
  65                /* sets power ctl register high */
  66                gpio_set_value(SG2_S0_POWER_CTL, 1);
  67                break;
  68        case 33:
  69        case 50:
  70                /* sets power control register low (clear) */
  71                gpio_set_value(SG2_S0_POWER_CTL, 0);
  72                msleep(100);
  73                break;
  74        default:
  75                pr_err("%s(): bad Vcc %u\n",
  76                       __func__, state->Vcc);
  77                return -1;
  78        }
  79
  80        /* reset */
  81        gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
  82
  83        return 0;
  84}
  85
  86static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
  87        .owner                  = THIS_MODULE,
  88        .hw_init                = sg2_pcmcia_hw_init,
  89        .socket_state           = sg2_pcmcia_socket_state,
  90        .configure_socket       = sg2_pcmcia_configure_socket,
  91        .nr                     = 1,
  92};
  93
  94static struct platform_device *sg2_pcmcia_device;
  95
  96static int __init sg2_pcmcia_init(void)
  97{
  98        int ret;
  99
 100        if (!machine_is_stargate2())
 101                return -ENODEV;
 102
 103        sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 104        if (!sg2_pcmcia_device)
 105                return -ENOMEM;
 106
 107        ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 108        if (ret)
 109                goto error_put_platform_device;
 110
 111        ret = platform_device_add_data(sg2_pcmcia_device,
 112                                       &sg2_pcmcia_ops,
 113                                       sizeof(sg2_pcmcia_ops));
 114        if (ret)
 115                goto error_free_gpios;
 116
 117        ret = platform_device_add(sg2_pcmcia_device);
 118        if (ret)
 119                goto error_free_gpios;
 120
 121        return 0;
 122error_free_gpios:
 123        gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 124error_put_platform_device:
 125        platform_device_put(sg2_pcmcia_device);
 126
 127        return ret;
 128}
 129
 130static void __exit sg2_pcmcia_exit(void)
 131{
 132        platform_device_unregister(sg2_pcmcia_device);
 133        gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
 134}
 135
 136fs_initcall(sg2_pcmcia_init);
 137module_exit(sg2_pcmcia_exit);
 138
 139MODULE_LICENSE("GPL");
 140MODULE_ALIAS("platform:pxa2xx-pcmcia");
 141
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