// SPDX-License-Identifier: GPL-2.0
/*
 * drivers/pcmcia/sa1100_jornada720.c
 *
 * Jornada720 PCMCIA specific routines
 *
 */
#include <linux/module.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/io.h>

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

#include "sa1111_generic.h"

/*
 * Socket 0 power: GPIO A0
 * Socket 0 3V: GPIO A2
 * Socket 1 power: GPIO A1 & GPIO A3
 * Socket 1 3V: GPIO A3
 * Does Socket 1 3V actually do anything?
 */
enum {
        J720_GPIO_PWR,
        J720_GPIO_3V,
        J720_GPIO_MAX,
};
struct jornada720_data {
        struct gpio_desc *gpio[J720_GPIO_MAX];
};

static int jornada720_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
        struct device *dev = skt->socket.dev.parent;
        struct jornada720_data *j;

        j = devm_kzalloc(dev, sizeof(*j), GFP_KERNEL);
        if (!j)
                return -ENOMEM;

        j->gpio[J720_GPIO_PWR] = devm_gpiod_get(dev, skt->nr ? "s1-power" :
                                                "s0-power", GPIOD_OUT_LOW);
        if (IS_ERR(j->gpio[J720_GPIO_PWR]))
                return PTR_ERR(j->gpio[J720_GPIO_PWR]);

        j->gpio[J720_GPIO_3V] = devm_gpiod_get(dev, skt->nr ? "s1-3v" :
                                               "s0-3v", GPIOD_OUT_LOW);
        if (IS_ERR(j->gpio[J720_GPIO_3V]))
                return PTR_ERR(j->gpio[J720_GPIO_3V]);

        skt->driver_data = j;

        return 0;
}

static int
jornada720_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
{
        struct jornada720_data *j = skt->driver_data;
        DECLARE_BITMAP(values, J720_GPIO_MAX) = { 0, };
        int ret;

        printk(KERN_INFO "%s(): config socket %d vcc %d vpp %d\n", __func__,
                skt->nr, state->Vcc, state->Vpp);

        switch (skt->nr) {
        case 0:
                switch (state->Vcc) {
                default:
                case  0:
                        __assign_bit(J720_GPIO_PWR, values, 0);
                        __assign_bit(J720_GPIO_3V, values, 0);
                        break;
                case 33:
                        __assign_bit(J720_GPIO_PWR, values, 1);
                        __assign_bit(J720_GPIO_3V, values, 1);
                        break;
                case 50:
                        __assign_bit(J720_GPIO_PWR, values, 1);
                        __assign_bit(J720_GPIO_3V, values, 0);
                        break;
                }
                break;

        case 1:
                switch (state->Vcc) {
                default:
                case 0:
                        __assign_bit(J720_GPIO_PWR, values, 0);
                        __assign_bit(J720_GPIO_3V, values, 0);
                        break;
                case 33:
                case 50:
                        __assign_bit(J720_GPIO_PWR, values, 1);
                        __assign_bit(J720_GPIO_3V, values, 1);
                        break;
                }
                break;

        default:
                return -1;
        }

        if (state->Vpp != state->Vcc && state->Vpp != 0) {
                printk(KERN_ERR "%s(): slot cannot support VPP %u\n",
                        __func__, state->Vpp);
                return -EPERM;
        }

        ret = sa1111_pcmcia_configure_socket(skt, state);
        if (ret == 0)
                ret = gpiod_set_array_value_cansleep(J720_GPIO_MAX, j->gpio,
                                                     NULL, values);

        return ret;
}

static struct pcmcia_low_level jornada720_pcmcia_ops = {
        .owner                  = THIS_MODULE,
        .hw_init                = jornada720_pcmcia_hw_init,
        .configure_socket       = jornada720_pcmcia_configure_socket,
        .first                  = 0,
        .nr                     = 2,
};

int pcmcia_jornada720_init(struct sa1111_dev *sadev)
{
        /* Fixme: why messing around with SA11x0's GPIO1? */
        GRER |= 0x00000002;

        sa11xx_drv_pcmcia_ops(&jornada720_pcmcia_ops);
        return sa1111_pcmcia_add(sadev, &jornada720_pcmcia_ops,
                                 sa11xx_drv_pcmcia_add_one);
}