// 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())
                ret = sa11xx_drv_pcmcia_probe(dev, &h3600_pcmcia_ops, 0, 2);

        return ret;
}