// SPDX-License-Identifier: GPL-2.0-only
/*
 * wl12xx SDIO routines
 *
 * Copyright (C) 2005 Texas Instruments Incorporated
 * Copyright (C) 2008 Google Inc
 * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
 */
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_irq.h>

#include "wl1251.h"

struct wl1251_sdio {
        struct sdio_func *func;
        u32 elp_val;
};

static struct sdio_func *wl_to_func(struct wl1251 *wl)
{
        struct wl1251_sdio *wl_sdio = wl->if_priv;
        return wl_sdio->func;
}

static void wl1251_sdio_interrupt(struct sdio_func *func)
{
        struct wl1251 *wl = sdio_get_drvdata(func);

        wl1251_debug(DEBUG_IRQ, "IRQ");

        /* FIXME should be synchronous for sdio */
        ieee80211_queue_work(wl->hw, &wl->irq_work);
}

static const struct sdio_device_id wl1251_devices[] = {
        { SDIO_DEVICE(SDIO_VENDOR_ID_TI_WL1251, SDIO_DEVICE_ID_TI_WL1251) },
        {}
};
MODULE_DEVICE_TABLE(sdio, wl1251_devices);


static void wl1251_sdio_read(struct wl1251 *wl, int addr,
                             void *buf, size_t len)
{
        int ret;
        struct sdio_func *func = wl_to_func(wl);

        sdio_claim_host(func);
        ret = sdio_memcpy_fromio(func, buf, addr, len);
        if (ret)
                wl1251_error("sdio read failed (%d)", ret);
        sdio_release_host(func);
}

static void wl1251_sdio_write(struct wl1251 *wl, int addr,
                              void *buf, size_t len)
{
        int ret;
        struct sdio_func *func = wl_to_func(wl);

        sdio_claim_host(func);
        ret = sdio_memcpy_toio(func, addr, buf, len);
        if (ret)
                wl1251_error("sdio write failed (%d)", ret);
        sdio_release_host(func);
}

static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
{
        int ret = 0;
        struct wl1251_sdio *wl_sdio = wl->if_priv;
        struct sdio_func *func = wl_sdio->func;

        /*
         * The hardware only supports RAW (read after write) access for
         * reading, regular sdio_readb won't work here (it interprets
         * the unused bits of CMD52 as write data even if we send read
         * request).
         */
        sdio_claim_host(func);
        *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
        sdio_release_host(func);

        if (ret)
                wl1251_error("sdio_readb failed (%d)", ret);
}

static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
{
        int ret = 0;
        struct wl1251_sdio *wl_sdio = wl->if_priv;
        struct sdio_func *func = wl_sdio->func;

        sdio_claim_host(func);
        sdio_writeb(func, val, addr, &ret);
        sdio_release_host(func);

        if (ret)
                wl1251_error("sdio_writeb failed (%d)", ret);
        else
                wl_sdio->elp_val = val;
}

static void wl1251_sdio_reset(struct wl1251 *wl)
{
}

static void wl1251_sdio_enable_irq(struct wl1251 *wl)
{
        struct sdio_func *func = wl_to_func(wl);

        sdio_claim_host(func);
        sdio_claim_irq(func, wl1251_sdio_interrupt);
        sdio_release_host(func);
}

static void wl1251_sdio_disable_irq(struct wl1251 *wl)
{
        struct sdio_func *func = wl_to_func(wl);

        sdio_claim_host(func);
        sdio_release_irq(func);
        sdio_release_host(func);
}

/* Interrupts when using dedicated WLAN_IRQ pin */
static irqreturn_t wl1251_line_irq(int irq, void *cookie)
{
        struct wl1251 *wl = cookie;

        ieee80211_queue_work(wl->hw, &wl->irq_work);

        return IRQ_HANDLED;
}

static void wl1251_enable_line_irq(struct wl1251 *wl)
{
        return enable_irq(wl->irq);
}

static void wl1251_disable_line_irq(struct wl1251 *wl)
{
        return disable_irq(wl->irq);
}

static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
{
        struct sdio_func *func = wl_to_func(wl);
        int ret;

        if (enable) {
                ret = pm_runtime_get_sync(&func->dev);
                if (ret < 0) {
                        pm_runtime_put_sync(&func->dev);
                        goto out;
                }

                sdio_claim_host(func);
                sdio_enable_func(func);
                sdio_release_host(func);
        } else {
                sdio_claim_host(func);
                sdio_disable_func(func);
                sdio_release_host(func);

                ret = pm_runtime_put_sync(&func->dev);
                if (ret < 0)
                        goto out;
        }

out:
        return ret;
}

static struct wl1251_if_operations wl1251_sdio_ops = {
        .read = wl1251_sdio_read,
        .write = wl1251_sdio_write,
        .write_elp = wl1251_sdio_write_elp,
        .read_elp = wl1251_sdio_read_elp,
        .reset = wl1251_sdio_reset,
        .power = wl1251_sdio_set_power,
};

static int wl1251_sdio_probe(struct sdio_func *func,
                             const struct sdio_device_id *id)
{
        int ret;
        struct wl1251 *wl;
        struct ieee80211_hw *hw;
        struct wl1251_sdio *wl_sdio;
        struct device_node *np = func->dev.of_node;

        hw = wl1251_alloc_hw();
        if (IS_ERR(hw))
                return PTR_ERR(hw);

        wl = hw->priv;

        wl_sdio = kzalloc_obj(*wl_sdio);
        if (wl_sdio == NULL) {
                ret = -ENOMEM;
                goto out_free_hw;
        }

        sdio_claim_host(func);
        ret = sdio_enable_func(func);
        if (ret)
                goto release;

        sdio_set_block_size(func, 512);
        sdio_release_host(func);

        SET_IEEE80211_DEV(hw, &func->dev);
        wl_sdio->func = func;
        wl->if_priv = wl_sdio;
        wl->if_ops = &wl1251_sdio_ops;

        if (np) {
                wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
                wl->irq = of_irq_get(np, 0);
                if (wl->irq == -EPROBE_DEFER) {
                        ret = -EPROBE_DEFER;
                        goto disable;
                }
        }

        if (wl->irq) {
                ret = request_irq(wl->irq, wl1251_line_irq, IRQF_NO_AUTOEN,
                                  "wl1251", wl);
                if (ret < 0) {
                        wl1251_error("request_irq() failed: %d", ret);
                        goto disable;
                }

                irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);

                wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
                wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;

                wl1251_info("using dedicated interrupt line");
        } else {
                wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
                wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;

                wl1251_info("using SDIO interrupt");
        }

        ret = wl1251_init_ieee80211(wl);
        if (ret)
                goto out_free_irq;

        sdio_set_drvdata(func, wl);

        /* Tell PM core that we don't need the card to be powered now */
        pm_runtime_put_noidle(&func->dev);

        return ret;

out_free_irq:
        if (wl->irq)
                free_irq(wl->irq, wl);
disable:
        sdio_claim_host(func);
        sdio_disable_func(func);
release:
        sdio_release_host(func);
        kfree(wl_sdio);
out_free_hw:
        wl1251_free_hw(wl);
        return ret;
}

static void wl1251_sdio_remove(struct sdio_func *func)
{
        struct wl1251 *wl = sdio_get_drvdata(func);
        struct wl1251_sdio *wl_sdio = wl->if_priv;

        /* Undo decrement done above in wl1251_probe */
        pm_runtime_get_noresume(&func->dev);

        if (wl->irq)
                free_irq(wl->irq, wl);
        wl1251_free_hw(wl);
        kfree(wl_sdio);

        sdio_claim_host(func);
        sdio_release_irq(func);
        sdio_disable_func(func);
        sdio_release_host(func);
}

static int wl1251_suspend(struct device *dev)
{
        /*
         * Tell MMC/SDIO core it's OK to power down the card
         * (if it isn't already), but not to remove it completely.
         */
        return 0;
}

static int wl1251_resume(struct device *dev)
{
        return 0;
}

static const struct dev_pm_ops wl1251_sdio_pm_ops = {
        .suspend        = wl1251_suspend,
        .resume         = wl1251_resume,
};

static struct sdio_driver wl1251_sdio_driver = {
        .name           = "wl1251_sdio",
        .id_table       = wl1251_devices,
        .probe          = wl1251_sdio_probe,
        .remove         = wl1251_sdio_remove,
        .drv.pm         = &wl1251_sdio_pm_ops,
};
module_sdio_driver(wl1251_sdio_driver);

MODULE_DESCRIPTION("TI WL1251 SDIO helpers");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");