linux/linux-5.4.31/drivers/pcmcia/sa1100_h3600.c

// SPDX-License-Identifier: GPL-2.0
/*
 * drivers/pcmcia/sa1100_h3600.c
 *
 * PCMCIA implementation routines for H3600
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/gpio.h>

#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <mach/h3xxx.h>

#include "sa1100_generic.h"

static int h3600_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
	int err;

	skt->stat[SOC_STAT_CD].name = skt->nr ? "pcmcia1-detect" : "pcmcia0-detect";
	skt->stat[SOC_STAT_RDY].name = skt->nr ? "pcmcia1-ready" : "pcmcia0-ready";

	err = soc_pcmcia_request_gpiods(skt);
	if (err)
		return err;

	switch (skt->nr) {
	case 0:
		err = gpio_request(H3XXX_EGPIO_OPT_NVRAM_ON, "OPT NVRAM ON");
		if (err)
			goto err01;
		err = gpio_direction_output(H3XXX_EGPIO_OPT_NVRAM_ON, 0);
		if (err)
			goto err03;
		err = gpio_request(H3XXX_EGPIO_OPT_ON, "OPT ON");
		if (err)
			goto err03;
		err = gpio_direction_output(H3XXX_EGPIO_OPT_ON, 0);
		if (err)
			goto err04;
		err = gpio_request(H3XXX_EGPIO_OPT_RESET, "OPT RESET");
		if (err)
			goto err04;
		err = gpio_direction_output(H3XXX_EGPIO_OPT_RESET, 0);
		if (err)
			goto err05;
		err = gpio_request(H3XXX_EGPIO_CARD_RESET, "PCMCIA CARD RESET");
		if (err)
			goto err05;
		err = gpio_direction_output(H3XXX_EGPIO_CARD_RESET, 0);
		if (err)
			goto err06;
		break;
	case 1:
		break;
	}
	return 0;

err06:	gpio_free(H3XXX_EGPIO_CARD_RESET);
err05:	gpio_free(H3XXX_EGPIO_OPT_RESET);
err04:	gpio_free(H3XXX_EGPIO_OPT_ON);
err03:	gpio_free(H3XXX_EGPIO_OPT_NVRAM_ON);
err01:	gpio_free(H3XXX_GPIO_PCMCIA_IRQ0);
	return err;
}

static void h3600_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
	switch (skt->nr) {
	case 0:
		/* Disable CF bus: */
		gpio_set_value(H3XXX_EGPIO_OPT_NVRAM_ON, 0);
		gpio_set_value(H3XXX_EGPIO_OPT_ON, 0);
		gpio_set_value(H3XXX_EGPIO_OPT_RESET, 1);

		gpio_free(H3XXX_EGPIO_CARD_RESET);
		gpio_free(H3XXX_EGPIO_OPT_RESET);
		gpio_free(H3XXX_EGPIO_OPT_ON);
		gpio_free(H3XXX_EGPIO_OPT_NVRAM_ON);
		break;
	case 1:
		break;
	}
}

static void
h3600_pcmcia_socket_state(struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
{
	state->bvd1 = 0;
	state->bvd2 = 0;
	state->vs_3v = 0;
	state->vs_Xv = 0;
}

static int
h3600_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
{
	if (state->Vcc != 0 && state->Vcc != 33 && state->Vcc != 50) {
		printk(KERN_ERR "h3600_pcmcia: unrecognized Vcc %u.%uV\n",
		       state->Vcc / 10, state->Vcc % 10);
		return -1;
	}

	gpio_set_value(H3XXX_EGPIO_CARD_RESET, !!(state->flags & SS_RESET));

	/* Silently ignore Vpp, output enable, speaker enable. */

	return 0;
}

static void h3600_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
{
	/* Enable CF bus: */
	gpio_set_value(H3XXX_EGPIO_OPT_NVRAM_ON, 1);
	gpio_set_value(H3XXX_EGPIO_OPT_ON, 1);
	gpio_set_value(H3XXX_EGPIO_OPT_RESET, 0);

	msleep(10);
}

static void h3600_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
{
	/*
	 * FIXME:  This doesn't fit well.  We don't have the mechanism in
	 * the generic PCMCIA layer to deal with the idea of two sockets
	 * on one bus.  We rely on the cs.c behaviour shutting down
	 * socket 0 then socket 1.
	 */
	if (skt->nr == 1) {
		gpio_set_value(H3XXX_EGPIO_OPT_ON, 0);
		gpio_set_value(H3XXX_EGPIO_OPT_NVRAM_ON, 0);
		/* hmm, does this suck power? */
		gpio_set_value(H3XXX_EGPIO_OPT_RESET, 1);
	}
}

struct pcmcia_low_level h3600_pcmcia_ops = { 
	.owner			= THIS_MODULE,
	.hw_init		= h3600_pcmcia_hw_init,
	.hw_shutdown		= h3600_pcmcia_hw_shutdown,
	.socket_state		= h3600_pcmcia_socket_state,
	.configure_socket	= h3600_pcmcia_configure_socket,

	.socket_init		= h3600_pcmcia_socket_init,
	.socket_suspend		= h3600_pcmcia_socket_suspend,
};

int pcmcia_h3600_init(struct device *dev)
{
	int ret = -ENODEV;

	if (machine_is_h3600() || machine_is_h3100())
		ret = sa11xx_drv_pcmcia_probe(dev, &h3600_pcmcia_ops, 0, 2);

	return ret;
}