LXR linux/drivers/pcmcia/pxa2xx

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
   4 */
   5
   6#include <linux/module.h>
   7#include <linux/platform_device.h>
   8#include <linux/err.h>
   9#include <linux/gpio.h>
  10#include <linux/irq.h>
  11
  12#include <asm/mach-types.h>
  13#include <mach/hx4700.h>
  14
  15#include "soc_common.h"
  16
  17static struct gpio gpios[] = {
  18        { GPIO114_HX4700_CF_RESET,    GPIOF_OUT_INIT_LOW,   "CF reset"        },
  19        { EGPIO4_CF_3V3_ON,           GPIOF_OUT_INIT_LOW,   "CF 3.3V enable"  },
  20};
  21
  22static int hx4700_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  23{
  24        int ret;
  25
  26        ret = gpio_request_array(gpios, ARRAY_SIZE(gpios));
  27        if (ret)
  28                goto out;
  29
  30        /*
  31         * IRQ type must be set before soc_pcmcia_hw_init() calls request_irq().
  32         * The asic3 default IRQ type is level trigger low level detect, exactly
  33         * the the signal present on GPIOD4_CF_nCD when a CF card is inserted.
  34         * If the IRQ type is not changed, the asic3 interrupt handler will loop
  35         * repeatedly because it is unable to clear the level trigger interrupt.
  36         */
  37        irq_set_irq_type(gpio_to_irq(GPIOD4_CF_nCD), IRQ_TYPE_EDGE_BOTH);
  38
  39        skt->stat[SOC_STAT_CD].gpio = GPIOD4_CF_nCD;
  40        skt->stat[SOC_STAT_CD].name = "PCMCIA CD";
  41        skt->stat[SOC_STAT_RDY].gpio = GPIO60_HX4700_CF_RNB;
  42        skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
  43
  44out:
  45        return ret;
  46}
  47
  48static void hx4700_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  49{
  50        gpio_free_array(gpios, ARRAY_SIZE(gpios));
  51}
  52
  53static void hx4700_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  54        struct pcmcia_state *state)
  55{
  56        state->vs_3v = 1;
  57        state->vs_Xv = 0;
  58}
  59
  60static int hx4700_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  61        const socket_state_t *state)
  62{
  63        switch (state->Vcc) {
  64        case 0:
  65                gpio_set_value(EGPIO4_CF_3V3_ON, 0);
  66                break;
  67        case 33:
  68                gpio_set_value(EGPIO4_CF_3V3_ON, 1);
  69                break;
  70        default:
  71                printk(KERN_ERR "pcmcia: Unsupported Vcc: %d\n", state->Vcc);
  72                return -EINVAL;
  73        }
  74
  75        gpio_set_value(GPIO114_HX4700_CF_RESET, (state->flags & SS_RESET) != 0);
  76
  77        return 0;
  78}
  79
  80static struct pcmcia_low_level hx4700_pcmcia_ops = {
  81        .owner          = THIS_MODULE,
  82        .nr             = 1,
  83        .hw_init        = hx4700_pcmcia_hw_init,
  84        .hw_shutdown    = hx4700_pcmcia_hw_shutdown,
  85        .socket_state   = hx4700_pcmcia_socket_state,
  86        .configure_socket = hx4700_pcmcia_configure_socket,
  87};
  88
  89static struct platform_device *hx4700_pcmcia_device;
  90
  91static int __init hx4700_pcmcia_init(void)
  92{
  93        struct platform_device *pdev;
  94
  95        if (!machine_is_h4700())
  96                return -ENODEV;
  97
  98        pdev = platform_device_register_data(NULL, "pxa2xx-pcmcia", -1,
  99                &hx4700_pcmcia_ops, sizeof(hx4700_pcmcia_ops));
 100        if (IS_ERR(pdev))
 101                return PTR_ERR(pdev);
 102
 103        hx4700_pcmcia_device = pdev;
 104
 105        return 0;
 106}
 107
 108static void __exit hx4700_pcmcia_exit(void)
 109{
 110        platform_device_unregister(hx4700_pcmcia_device);
 111}
 112
 113module_init(hx4700_pcmcia_init);
 114module_exit(hx4700_pcmcia_exit);
 115
 116MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
 117MODULE_DESCRIPTION("HP iPAQ hx4700 PCMCIA driver");
 118MODULE_LICENSE("GPL");
 119