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");