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 pcmcia_irqs irqs[] = {
37	{.sock = 0, .str = "PCMCIA0 CD" },
38};
39
40static struct gpio sg2_pcmcia_gpios[] = {
41	{ SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
42	{ SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
43};
44
45static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
46{
47	skt->socket.pci_irq = gpio_to_irq(SG2_S0_GPIO_READY);
48	irqs[0].irq = gpio_to_irq(SG2_S0_GPIO_DETECT);
49
50	return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
51}
52
53static void sg2_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
54{
55	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
56}
57
58static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
59				    struct pcmcia_state *state)
60{
61	state->detect = !gpio_get_value(SG2_S0_GPIO_DETECT);
62	state->ready  = !!gpio_get_value(SG2_S0_GPIO_READY);
63	state->bvd1   = 0; /* not available - battery detect on card */
64	state->bvd2   = 0; /* not available */
65	state->vs_3v  = 1; /* not available - voltage detect for card */
66	state->vs_Xv  = 0; /* not available */
67	state->wrprot = 0; /* not available - write protect */
68}
69
70static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
71				       const socket_state_t *state)
72{
73	/* Enable card power */
74	switch (state->Vcc) {
75	case 0:
76		/* sets power ctl register high */
77		gpio_set_value(SG2_S0_POWER_CTL, 1);
78		break;
79	case 33:
80	case 50:
81		/* sets power control register low (clear) */
82		gpio_set_value(SG2_S0_POWER_CTL, 0);
83		msleep(100);
84		break;
85	default:
86		pr_err("%s(): bad Vcc %u\n",
87		       __func__, state->Vcc);
88		return -1;
89	}
90
91	/* reset */
92	gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
93
94	return 0;
95}
96
97static void sg2_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
98{
99	soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
100}
101
102static void sg2_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
103{
104	soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
105}
106
107static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
108	.owner			= THIS_MODULE,
109	.hw_init		= sg2_pcmcia_hw_init,
110	.hw_shutdown		= sg2_pcmcia_hw_shutdown,
111	.socket_state		= sg2_pcmcia_socket_state,
112	.configure_socket	= sg2_pcmcia_configure_socket,
113	.socket_init		= sg2_pcmcia_socket_init,
114	.socket_suspend		= sg2_pcmcia_socket_suspend,
115	.nr			= 1,
116};
117
118static struct platform_device *sg2_pcmcia_device;
119
120static int __init sg2_pcmcia_init(void)
121{
122	int ret;
123
124	if (!machine_is_stargate2())
125		return -ENODEV;
126
127	sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
128	if (!sg2_pcmcia_device)
129		return -ENOMEM;
130
131	ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
132	if (ret)
133		goto error_put_platform_device;
134
135	ret = platform_device_add_data(sg2_pcmcia_device,
136				       &sg2_pcmcia_ops,
137				       sizeof(sg2_pcmcia_ops));
138	if (ret)
139		goto error_free_gpios;
140
141	ret = platform_device_add(sg2_pcmcia_device);
142	if (ret)
143		goto error_free_gpios;
144
145	return 0;
146error_free_gpios:
147	gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
148error_put_platform_device:
149	platform_device_put(sg2_pcmcia_device);
150
151	return ret;
152}
153
154static void __exit sg2_pcmcia_exit(void)
155{
156	platform_device_unregister(sg2_pcmcia_device);
157	gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
158}
159
160fs_initcall(sg2_pcmcia_init);
161module_exit(sg2_pcmcia_exit);
162
163MODULE_LICENSE("GPL");
164MODULE_ALIAS("platform:pxa2xx-pcmcia");
165