// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Broadcom B43 wireless driver
 *
 * SDIO over Sonics Silicon Backplane bus glue for b43.
 *
 * Copyright (C) 2009 Albert Herranz
 * Copyright (C) 2009 Michael Buesch <m@bues.ch>
 */

#include <linux/kernel.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/slab.h>
#include <linux/ssb/ssb.h>

#include "sdio.h"
#include "b43.h"


#define HNBU_CHIPID             0x01    /* vendor & device id */

#define B43_SDIO_BLOCK_SIZE     64      /* rx fifo max size in bytes */


static const struct b43_sdio_quirk {
        u16 vendor;
        u16 device;
        unsigned int quirks;
} b43_sdio_quirks[] = {
        { 0x14E4, 0x4318, SSB_QUIRK_SDIO_READ_AFTER_WRITE32, },
        { },
};


static unsigned int b43_sdio_get_quirks(u16 vendor, u16 device)
{
        const struct b43_sdio_quirk *q;

        for (q = b43_sdio_quirks; q->quirks; q++) {
                if (vendor == q->vendor && device == q->device)
                        return q->quirks;
        }

        return 0;
}

static void b43_sdio_interrupt_dispatcher(struct sdio_func *func)
{
        struct b43_sdio *sdio = sdio_get_drvdata(func);
        struct b43_wldev *dev = sdio->irq_handler_opaque;

        if (unlikely(b43_status(dev) < B43_STAT_STARTED))
                return;

        sdio_release_host(func);
        sdio->irq_handler(dev);
        sdio_claim_host(func);
}

int b43_sdio_request_irq(struct b43_wldev *dev,
                         void (*handler)(struct b43_wldev *dev))
{
        struct ssb_bus *bus = dev->dev->sdev->bus;
        struct sdio_func *func = bus->host_sdio;
        struct b43_sdio *sdio = sdio_get_drvdata(func);
        int err;

        sdio->irq_handler_opaque = dev;
        sdio->irq_handler = handler;
        sdio_claim_host(func);
        err = sdio_claim_irq(func, b43_sdio_interrupt_dispatcher);
        sdio_release_host(func);

        return err;
}

void b43_sdio_free_irq(struct b43_wldev *dev)
{
        struct ssb_bus *bus = dev->dev->sdev->bus;
        struct sdio_func *func = bus->host_sdio;
        struct b43_sdio *sdio = sdio_get_drvdata(func);

        sdio_claim_host(func);
        sdio_release_irq(func);
        sdio_release_host(func);
        sdio->irq_handler_opaque = NULL;
        sdio->irq_handler = NULL;
}

static int b43_sdio_probe(struct sdio_func *func,
                                    const struct sdio_device_id *id)
{
        struct b43_sdio *sdio;
        struct sdio_func_tuple *tuple;
        u16 vendor = 0, device = 0;
        int error;

        /* Look for the card chip identifier. */
        tuple = func->tuples;
        while (tuple) {
                switch (tuple->code) {
                case 0x80:
                        switch (tuple->data[0]) {
                        case HNBU_CHIPID:
                                if (tuple->size != 5)
                                        break;
                                vendor = tuple->data[1] | (tuple->data[2]<<8);
                                device = tuple->data[3] | (tuple->data[4]<<8);
                                dev_info(&func->dev, "Chip ID %04x:%04x\n",
                                         vendor, device);
                                break;
                        default:
                                break;
                        }
                        break;
                default:
                        break;
                }
                tuple = tuple->next;
        }
        if (!vendor || !device) {
                error = -ENODEV;
                goto out;
        }

        sdio_claim_host(func);
        error = sdio_set_block_size(func, B43_SDIO_BLOCK_SIZE);
        if (error) {
                dev_err(&func->dev, "failed to set block size to %u bytes,"
                        " error %d\n", B43_SDIO_BLOCK_SIZE, error);
                goto err_release_host;
        }
        error = sdio_enable_func(func);
        if (error) {
                dev_err(&func->dev, "failed to enable func, error %d\n", error);
                goto err_release_host;
        }
        sdio_release_host(func);

        sdio = kzalloc_obj(*sdio);
        if (!sdio) {
                error = -ENOMEM;
                dev_err(&func->dev, "failed to allocate ssb bus\n");
                goto err_disable_func;
        }
        error = ssb_bus_sdiobus_register(&sdio->ssb, func,
                                         b43_sdio_get_quirks(vendor, device));
        if (error) {
                dev_err(&func->dev, "failed to register ssb sdio bus,"
                        " error %d\n", error);
                goto err_free_ssb;
        }
        sdio_set_drvdata(func, sdio);

        return 0;

err_free_ssb:
        kfree(sdio);
err_disable_func:
        sdio_claim_host(func);
        sdio_disable_func(func);
err_release_host:
        sdio_release_host(func);
out:
        return error;
}

static void b43_sdio_remove(struct sdio_func *func)
{
        struct b43_sdio *sdio = sdio_get_drvdata(func);

        ssb_bus_unregister(&sdio->ssb);
        sdio_claim_host(func);
        sdio_disable_func(func);
        sdio_release_host(func);
        kfree(sdio);
        sdio_set_drvdata(func, NULL);
}

static const struct sdio_device_id b43_sdio_ids[] = {
        { SDIO_DEVICE(SDIO_VENDOR_ID_BROADCOM, SDIO_DEVICE_ID_BROADCOM_NINTENDO_WII) },
        { SDIO_DEVICE(SDIO_VENDOR_ID_CGUYS, SDIO_DEVICE_ID_CGUYS_EW_CG1102GC) },
        { },
};

static struct sdio_driver b43_sdio_driver = {
        .name           = "b43-sdio",
        .id_table       = b43_sdio_ids,
        .probe          = b43_sdio_probe,
        .remove         = b43_sdio_remove,
};

int b43_sdio_init(void)
{
        return sdio_register_driver(&b43_sdio_driver);
}

void b43_sdio_exit(void)
{
        sdio_unregister_driver(&b43_sdio_driver);
}