LXR linux/drivers/pcmcia/pxa2xx

   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_BUFF_CTL         120
  32#define SG2_S0_POWER_CTL        108
  33#define SG2_S0_GPIO_RESET       82
  34#define SG2_S0_GPIO_DETECT      53
  35#define SG2_S0_GPIO_READY       81
  36
  37static struct pcmcia_irqs irqs[] = {
  38        { 0, IRQ_GPIO(SG2_S0_GPIO_DETECT), "PCMCIA0 CD" },
  39};
  40
  41static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  42{
  43        skt->socket.pci_irq = IRQ_GPIO(SG2_S0_GPIO_READY);
  44        return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  45}
  46
  47static void sg2_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  48{
  49        soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  50}
  51
  52static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  53                                    struct pcmcia_state *state)
  54{
  55        state->detect = !gpio_get_value(SG2_S0_GPIO_DETECT);
  56        state->ready  = !!gpio_get_value(SG2_S0_GPIO_READY);
  57        state->bvd1   = 0; /* not available - battery detect on card */
  58        state->bvd2   = 0; /* not available */
  59        state->vs_3v  = 1; /* not available - voltage detect for card */
  60        state->vs_Xv  = 0; /* not available */
  61        state->wrprot = 0; /* not available - write protect */
  62}
  63
  64static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  65                                       const socket_state_t *state)
  66{
  67        /* Enable card power */
  68        switch (state->Vcc) {
  69        case 0:
  70                /* sets power ctl register high */
  71                gpio_set_value(SG2_S0_POWER_CTL, 1);
  72                break;
  73        case 33:
  74        case 50:
  75                /* sets power control register low (clear) */
  76                gpio_set_value(SG2_S0_POWER_CTL, 0);
  77                msleep(100);
  78                break;
  79        default:
  80                pr_err("%s(): bad Vcc %u\n",
  81                       __func__, state->Vcc);
  82                return -1;
  83        }
  84
  85        /* reset */
  86        gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
  87
  88        return 0;
  89}
  90
  91static void sg2_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
  92{
  93        soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
  94}
  95
  96static void sg2_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
  97{
  98        soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
  99}
 100
 101static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
 102        .owner                  = THIS_MODULE,
 103        .hw_init                = sg2_pcmcia_hw_init,
 104        .hw_shutdown            = sg2_pcmcia_hw_shutdown,
 105        .socket_state           = sg2_pcmcia_socket_state,
 106        .configure_socket       = sg2_pcmcia_configure_socket,
 107        .socket_init            = sg2_pcmcia_socket_init,
 108        .socket_suspend         = sg2_pcmcia_socket_suspend,
 109        .nr                     = 1,
 110};
 111
 112static struct platform_device *sg2_pcmcia_device;
 113
 114static int __init sg2_pcmcia_init(void)
 115{
 116        int ret;
 117
 118        if (!machine_is_stargate2())
 119                return -ENODEV;
 120
 121        sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 122        if (!sg2_pcmcia_device)
 123                return -ENOMEM;
 124
 125        ret = gpio_request(SG2_S0_BUFF_CTL, "SG2 CF buff ctl");
 126        if (ret)
 127                goto error_put_platform_device;
 128        ret = gpio_request(SG2_S0_POWER_CTL, "SG2 CF power ctl");
 129        if (ret)
 130                goto error_free_gpio_buff_ctl;
 131        ret = gpio_request(SG2_S0_GPIO_RESET, "SG2 CF reset");
 132        if (ret)
 133                goto error_free_gpio_power_ctl;
 134        /* Set gpio directions */
 135        gpio_direction_output(SG2_S0_BUFF_CTL, 0);
 136        gpio_direction_output(SG2_S0_POWER_CTL, 1);
 137        gpio_direction_output(SG2_S0_GPIO_RESET, 1);
 138
 139        ret = platform_device_add_data(sg2_pcmcia_device,
 140                                       &sg2_pcmcia_ops,
 141                                       sizeof(sg2_pcmcia_ops));
 142        if (ret)
 143                goto error_free_gpio_reset;
 144
 145        ret = platform_device_add(sg2_pcmcia_device);
 146        if (ret)
 147                goto error_free_gpio_reset;
 148
 149        return 0;
 150error_free_gpio_reset:
 151        gpio_free(SG2_S0_GPIO_RESET);
 152error_free_gpio_power_ctl:
 153        gpio_free(SG2_S0_POWER_CTL);
 154error_free_gpio_buff_ctl:
 155        gpio_free(SG2_S0_BUFF_CTL);
 156error_put_platform_device:
 157        platform_device_put(sg2_pcmcia_device);
 158
 159        return ret;
 160}
 161
 162static void __exit sg2_pcmcia_exit(void)
 163{
 164        platform_device_unregister(sg2_pcmcia_device);
 165        gpio_free(SG2_S0_BUFF_CTL);
 166        gpio_free(SG2_S0_POWER_CTL);
 167        gpio_free(SG2_S0_GPIO_RESET);
 168}
 169
 170fs_initcall(sg2_pcmcia_init);
 171module_exit(sg2_pcmcia_exit);
 172
 173MODULE_LICENSE("GPL");
 174MODULE_ALIAS("platform:pxa2xx-pcmcia");
 175