1/*
  2 *  Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
  3 *
  4 *  This program is free software; you can redistribute it and/or modify
  5 *  it under the terms of the GNU General Public License version 2 as
  6 *  published by the Free Software Foundation.
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/platform_device.h>
 11#include <linux/err.h>
 12#include <linux/gpio.h>
 13#include <linux/irq.h>
 14
 15#include <asm/mach-types.h>
 16#include <mach/hx4700.h>
 17
 18#include "soc_common.h"
 19
 20static struct gpio gpios[] = {
 21	{ GPIO114_HX4700_CF_RESET,    GPIOF_OUT_INIT_LOW,   "CF reset"        },
 22	{ EGPIO4_CF_3V3_ON,           GPIOF_OUT_INIT_LOW,   "CF 3.3V enable"  },
 23};
 24
 25static int hx4700_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
 26{
 27	int ret;
 28
 29	ret = gpio_request_array(gpios, ARRAY_SIZE(gpios));
 30	if (ret)
 31		goto out;
 32
 33	/*
 34	 * IRQ type must be set before soc_pcmcia_hw_init() calls request_irq().
 35	 * The asic3 default IRQ type is level trigger low level detect, exactly
 36	 * the the signal present on GPIOD4_CF_nCD when a CF card is inserted.
 37	 * If the IRQ type is not changed, the asic3 interrupt handler will loop
 38	 * repeatedly because it is unable to clear the level trigger interrupt.
 39	 */
 40	irq_set_irq_type(gpio_to_irq(GPIOD4_CF_nCD), IRQ_TYPE_EDGE_BOTH);
 41
 42	skt->stat[SOC_STAT_CD].gpio = GPIOD4_CF_nCD;
 43	skt->stat[SOC_STAT_CD].name = "PCMCIA CD";
 44	skt->stat[SOC_STAT_RDY].gpio = GPIO60_HX4700_CF_RNB;
 45	skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
 46
 47out:
 48	return ret;
 49}
 50
 51static void hx4700_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
 52{
 53	gpio_free_array(gpios, ARRAY_SIZE(gpios));
 54}
 55
 56static void hx4700_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
 57	struct pcmcia_state *state)
 58{
 59	state->vs_3v = 1;
 60	state->vs_Xv = 0;
 61}
 62
 63static int hx4700_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 64	const socket_state_t *state)
 65{
 66	switch (state->Vcc) {
 67	case 0:
 68		gpio_set_value(EGPIO4_CF_3V3_ON, 0);
 69		break;
 70	case 33:
 71		gpio_set_value(EGPIO4_CF_3V3_ON, 1);
 72		break;
 73	default:
 74		printk(KERN_ERR "pcmcia: Unsupported Vcc: %d\n", state->Vcc);
 75		return -EINVAL;
 76	}
 77
 78	gpio_set_value(GPIO114_HX4700_CF_RESET, (state->flags & SS_RESET) != 0);
 79
 80	return 0;
 81}
 82
 83static struct pcmcia_low_level hx4700_pcmcia_ops = {
 84	.owner          = THIS_MODULE,
 85	.nr             = 1,
 86	.hw_init        = hx4700_pcmcia_hw_init,
 87	.hw_shutdown    = hx4700_pcmcia_hw_shutdown,
 88	.socket_state   = hx4700_pcmcia_socket_state,
 89	.configure_socket = hx4700_pcmcia_configure_socket,
 90};
 91
 92static struct platform_device *hx4700_pcmcia_device;
 93
 94static int __init hx4700_pcmcia_init(void)
 95{
 96	struct platform_device *pdev;
 97
 98	if (!machine_is_h4700())
 99		return -ENODEV;
100
101	pdev = platform_device_register_data(NULL, "pxa2xx-pcmcia", -1,
102		&hx4700_pcmcia_ops, sizeof(hx4700_pcmcia_ops));
103	if (IS_ERR(pdev))
104		return PTR_ERR(pdev);
105
106	hx4700_pcmcia_device = pdev;
107
108	return 0;
109}
110
111static void __exit hx4700_pcmcia_exit(void)
112{
113	platform_device_unregister(hx4700_pcmcia_device);
114}
115
116module_init(hx4700_pcmcia_init);
117module_exit(hx4700_pcmcia_exit);
118
119MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
120MODULE_DESCRIPTION("HP iPAQ hx4700 PCMCIA driver");
121MODULE_LICENSE("GPL");