1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/pcmcia/pxa2xx_stargate2.c
4 *
5 * Stargate 2 PCMCIA specific routines.
6 *
7 * Created:	December 6, 2005
8 * Author:	Ed C. Epp
9 * Copyright:	Intel Corp 2005
10 *              Jonathan Cameron <jic23@cam.ac.uk> 2009
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/interrupt.h>
17#include <linux/delay.h>
18#include <linux/platform_device.h>
19#include <linux/gpio.h>
20
21#include <pcmcia/ss.h>
22
23#include <asm/irq.h>
24#include <asm/mach-types.h>
25
26#include "soc_common.h"
27
28#define SG2_S0_POWER_CTL	108
29#define SG2_S0_GPIO_RESET	82
30#define SG2_S0_GPIO_DETECT	53
31#define SG2_S0_GPIO_READY	81
32
33static struct gpio sg2_pcmcia_gpios[] = {
34	{ SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
35	{ SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
36};
37
38static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
39{
40	skt->stat[SOC_STAT_CD].gpio = SG2_S0_GPIO_DETECT;
41	skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
42	skt->stat[SOC_STAT_RDY].gpio = SG2_S0_GPIO_READY;
43	skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
44	return 0;
45}
46
47static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
48				    struct pcmcia_state *state)
49{
50	state->bvd1   = 0; /* not available - battery detect on card */
51	state->bvd2   = 0; /* not available */
52	state->vs_3v  = 1; /* not available - voltage detect for card */
53	state->vs_Xv  = 0; /* not available */
54}
55
56static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
57				       const socket_state_t *state)
58{
59	/* Enable card power */
60	switch (state->Vcc) {
61	case 0:
62		/* sets power ctl register high */
63		gpio_set_value(SG2_S0_POWER_CTL, 1);
64		break;
65	case 33:
66	case 50:
67		/* sets power control register low (clear) */
68		gpio_set_value(SG2_S0_POWER_CTL, 0);
69		msleep(100);
70		break;
71	default:
72		pr_err("%s(): bad Vcc %u\n",
73		       __func__, state->Vcc);
74		return -1;
75	}
76
77	/* reset */
78	gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
79
80	return 0;
81}
82
83static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
84	.owner			= THIS_MODULE,
85	.hw_init		= sg2_pcmcia_hw_init,
86	.socket_state		= sg2_pcmcia_socket_state,
87	.configure_socket	= sg2_pcmcia_configure_socket,
88	.nr			= 1,
89};
90
91static struct platform_device *sg2_pcmcia_device;
92
93static int __init sg2_pcmcia_init(void)
94{
95	int ret;
96
97	if (!machine_is_stargate2())
98		return -ENODEV;
99
100	sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
101	if (!sg2_pcmcia_device)
102		return -ENOMEM;
103
104	ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
105	if (ret)
106		goto error_put_platform_device;
107
108	ret = platform_device_add_data(sg2_pcmcia_device,
109				       &sg2_pcmcia_ops,
110				       sizeof(sg2_pcmcia_ops));
111	if (ret)
112		goto error_free_gpios;
113
114	ret = platform_device_add(sg2_pcmcia_device);
115	if (ret)
116		goto error_free_gpios;
117
118	return 0;
119error_free_gpios:
120	gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
121error_put_platform_device:
122	platform_device_put(sg2_pcmcia_device);
123
124	return ret;
125}
126
127static void __exit sg2_pcmcia_exit(void)
128{
129	platform_device_unregister(sg2_pcmcia_device);
130	gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
131}
132
133fs_initcall(sg2_pcmcia_init);
134module_exit(sg2_pcmcia_exit);
135
136MODULE_LICENSE("GPL");
137MODULE_ALIAS("platform:pxa2xx-pcmcia");
138