xref: /kernel/linux/linux-5.10/drivers/pcmcia/sa1100_simpad.c (revision 8c2ecf20)

// SPDX-License-Identifier: GPL-2.0
/*
 * drivers/pcmcia/sa1100_simpad.c
 *
 * PCMCIA implementation routines for simpad
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/init.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <mach/simpad.h>
#include "sa1100_generic.h"

static int simpad_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{

	simpad_clear_cs3_bit(VCC_3V_EN|VCC_5V_EN|EN0|EN1);

	skt->stat[SOC_STAT_CD].name = "cf-detect";
	skt->stat[SOC_STAT_RDY].name = "cf-ready";

	return soc_pcmcia_request_gpiods(skt);
}

static void simpad_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
	/* Disable CF bus: */
	/*simpad_set_cs3_bit(PCMCIA_BUFF_DIS);*/
	simpad_clear_cs3_bit(PCMCIA_RESET);
}

static void
simpad_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
			   struct pcmcia_state *state)
{
	long cs3reg = simpad_get_cs3_ro();

	/* bvd1 might be cs3reg & PCMCIA_BVD1 */
	/* bvd2 might be cs3reg & PCMCIA_BVD2 */

	if ((cs3reg & (PCMCIA_VS1|PCMCIA_VS2)) ==
			(PCMCIA_VS1|PCMCIA_VS2)) {
		state->vs_3v=0;
		state->vs_Xv=0;
	} else {
		state->vs_3v=1;
		state->vs_Xv=0;
	}
}

static int
simpad_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
			       const socket_state_t *state)
{
	unsigned long flags;

	local_irq_save(flags);

	/* Murphy: see table of MIC2562a-1 */
	switch (state->Vcc) {
	case 0:
		simpad_clear_cs3_bit(VCC_3V_EN|VCC_5V_EN|EN0|EN1);
		break;

	case 33:
		simpad_clear_cs3_bit(VCC_3V_EN|EN1);
		simpad_set_cs3_bit(VCC_5V_EN|EN0);
		break;

	case 50:
		simpad_clear_cs3_bit(VCC_5V_EN|EN1);
		simpad_set_cs3_bit(VCC_3V_EN|EN0);
		break;

	default:
		printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
			__func__, state->Vcc);
		simpad_clear_cs3_bit(VCC_3V_EN|VCC_5V_EN|EN0|EN1);
		local_irq_restore(flags);
		return -1;
	}


	local_irq_restore(flags);

	return 0;
}

static void simpad_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
{
	simpad_set_cs3_bit(PCMCIA_RESET);
}

static struct pcmcia_low_level simpad_pcmcia_ops = {
	.owner			= THIS_MODULE,
	.hw_init		= simpad_pcmcia_hw_init,
	.hw_shutdown		= simpad_pcmcia_hw_shutdown,
	.socket_state		= simpad_pcmcia_socket_state,
	.configure_socket	= simpad_pcmcia_configure_socket,
	.socket_suspend		= simpad_pcmcia_socket_suspend,
};

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

	if (machine_is_simpad())
		ret = sa11xx_drv_pcmcia_probe(dev, &simpad_pcmcia_ops, 1, 1);

	return ret;
}