ahb.c

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/*
 * Copyright (c) 2008-2011 Atheros Communications Inc.
 * Copyright (c) 2009 Gabor Juhos <[email protected]>
 * Copyright (c) 2009 Imre Kaloz <[email protected]>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/nl80211.h>
#include <linux/platform_device.h>
#include <linux/ath9k_platform.h>
#include <linux/module.h>
#include "ath9k.h"

static const struct platform_device_id ath9k_platform_id_table[] = {
    {
        .name = "ath9k",
        .driver_data = AR5416_AR9100_DEVID,
    },
    {
        .name = "ar933x_wmac",
        .driver_data = AR9300_DEVID_AR9330,
    },
    {
        .name = "ar934x_wmac",
        .driver_data = AR9300_DEVID_AR9340,
    },
    {
        .name = "qca955x_wmac",
        .driver_data = AR9300_DEVID_QCA955X,
    },
    {},
};

/* return bus cachesize in 4B word units */
static void ath_ahb_read_cachesize(struct ath_common *common, int *csz)
{
    *csz = L1_CACHE_BYTES >> 2;
}

static bool ath_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
{
    struct ath_softc *sc = (struct ath_softc *)common->priv;
    struct platform_device *pdev = to_platform_device(sc->dev);
    struct ath9k_platform_data *pdata;

    pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
    if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
        ath_err(common,
            "%s: flash read failed, offset %08x is out of range\n",
            __func__, off);
        return false;
    }

    *data = pdata->eeprom_data[off];
    return true;
}

static struct ath_bus_ops ath_ahb_bus_ops  = {
    .ath_bus_type = ATH_AHB,
    .read_cachesize = ath_ahb_read_cachesize,
    .eeprom_read = ath_ahb_eeprom_read,
};

static int ath_ahb_probe(struct platform_device *pdev)
{
    void __iomem *mem;
    struct ath_softc *sc;
    struct ieee80211_hw *hw;
    struct resource *res;
    const struct platform_device_id *id = platform_get_device_id(pdev);
    int irq;
    int ret = 0;
    struct ath_hw *ah;
    char hw_name[64];

    if (!pdev->dev.platform_data) {
        dev_err(&pdev->dev, "no platform data specified\n");
        ret = -EINVAL;
        goto err_out;
    }

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "no memory resource found\n");
        ret = -ENXIO;
        goto err_out;
    }

    mem = ioremap_nocache(res->start, resource_size(res));
    if (mem == NULL) {
        dev_err(&pdev->dev, "ioremap failed\n");
        ret = -ENOMEM;
        goto err_out;
    }

    res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "no IRQ resource found\n");
        ret = -ENXIO;
        goto err_iounmap;
    }

    irq = res->start;

    hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
    if (hw == NULL) {
        dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
        ret = -ENOMEM;
        goto err_iounmap;
    }

    SET_IEEE80211_DEV(hw, &pdev->dev);
    platform_set_drvdata(pdev, hw);

    sc = hw->priv;
    sc->hw = hw;
    sc->dev = &pdev->dev;
    sc->mem = mem;
    sc->irq = irq;

    /* Will be cleared in ath9k_start() */
    set_bit(SC_OP_INVALID, &sc->sc_flags);

    ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
    if (ret) {
        dev_err(&pdev->dev, "request_irq failed\n");
        goto err_free_hw;
    }

    ret = ath9k_init_device(id->driver_data, sc, &ath_ahb_bus_ops);
    if (ret) {
        dev_err(&pdev->dev, "failed to initialize device\n");
        goto err_irq;
    }

    ah = sc->sc_ah;
    ath9k_hw_name(ah, hw_name, sizeof(hw_name));
    wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
           hw_name, (unsigned long)mem, irq);

    return 0;

 err_irq:
    free_irq(irq, sc);
 err_free_hw:
    ieee80211_free_hw(hw);
    platform_set_drvdata(pdev, NULL);
 err_iounmap:
    iounmap(mem);
 err_out:
    return ret;
}

static int ath_ahb_remove(struct platform_device *pdev)
{
    struct ieee80211_hw *hw = platform_get_drvdata(pdev);

    if (hw) {
        struct ath_softc *sc = hw->priv;
        void __iomem *mem = sc->mem;

        ath9k_deinit_device(sc);
        free_irq(sc->irq, sc);
        ieee80211_free_hw(sc->hw);
        iounmap(mem);
        platform_set_drvdata(pdev, NULL);
    }

    return 0;
}

static struct platform_driver ath_ahb_driver = {
    .probe      = ath_ahb_probe,
    .remove     = ath_ahb_remove,
    .driver     = {
        .name   = "ath9k",
        .owner  = THIS_MODULE,
    },
    .id_table    = ath9k_platform_id_table,
};

MODULE_DEVICE_TABLE(platform, ath9k_platform_id_table);

int ath_ahb_init(void)
{
    return platform_driver_register(&ath_ahb_driver);
}

void ath_ahb_exit(void)
{
    platform_driver_unregister(&ath_ahb_driver);
}