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