xref: /kernel/linux/linux-5.10/drivers/pcmcia/pxa2xx_stargate2.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/drivers/pcmcia/pxa2xx_stargate2.c
 *
 * Stargate 2 PCMCIA specific routines.
 *
 * Created:	December 6, 2005
 * Author:	Ed C. Epp
 * Copyright:	Intel Corp 2005
 *              Jonathan Cameron <jic23@cam.ac.uk> 2009
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>

#include <pcmcia/ss.h>

#include <asm/irq.h>
#include <asm/mach-types.h>

#include "soc_common.h"

#define SG2_S0_POWER_CTL	108
#define SG2_S0_GPIO_RESET	82
#define SG2_S0_GPIO_DETECT	53
#define SG2_S0_GPIO_READY	81

static struct gpio sg2_pcmcia_gpios[] = {
	{ SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
	{ SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
};

static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
	skt->stat[SOC_STAT_CD].gpio = SG2_S0_GPIO_DETECT;
	skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
	skt->stat[SOC_STAT_RDY].gpio = SG2_S0_GPIO_READY;
	skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
	return 0;
}

static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
				    struct pcmcia_state *state)
{
	state->bvd1   = 0; /* not available - battery detect on card */
	state->bvd2   = 0; /* not available */
	state->vs_3v  = 1; /* not available - voltage detect for card */
	state->vs_Xv  = 0; /* not available */
}

static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
				       const socket_state_t *state)
{
	/* Enable card power */
	switch (state->Vcc) {
	case 0:
		/* sets power ctl register high */
		gpio_set_value(SG2_S0_POWER_CTL, 1);
		break;
	case 33:
	case 50:
		/* sets power control register low (clear) */
		gpio_set_value(SG2_S0_POWER_CTL, 0);
		msleep(100);
		break;
	default:
		pr_err("%s(): bad Vcc %u\n",
		       __func__, state->Vcc);
		return -1;
	}

	/* reset */
	gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));

	return 0;
}

static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
	.owner			= THIS_MODULE,
	.hw_init		= sg2_pcmcia_hw_init,
	.socket_state		= sg2_pcmcia_socket_state,
	.configure_socket	= sg2_pcmcia_configure_socket,
	.nr			= 1,
};

static struct platform_device *sg2_pcmcia_device;

static int __init sg2_pcmcia_init(void)
{
	int ret;

	if (!machine_is_stargate2())
		return -ENODEV;

	sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
	if (!sg2_pcmcia_device)
		return -ENOMEM;

	ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
	if (ret)
		goto error_put_platform_device;

	ret = platform_device_add_data(sg2_pcmcia_device,
				       &sg2_pcmcia_ops,
				       sizeof(sg2_pcmcia_ops));
	if (ret)
		goto error_free_gpios;

	ret = platform_device_add(sg2_pcmcia_device);
	if (ret)
		goto error_free_gpios;

	return 0;
error_free_gpios:
	gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
error_put_platform_device:
	platform_device_put(sg2_pcmcia_device);

	return ret;
}

static void __exit sg2_pcmcia_exit(void)
{
	platform_device_unregister(sg2_pcmcia_device);
	gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
}

fs_initcall(sg2_pcmcia_init);
module_exit(sg2_pcmcia_exit);

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-pcmcia");