ahb.c

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/*
 * Copyright (c) 2008-2009 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/etherdevice.h>
#include <linux/export.h>
#include <ar231x_platform.h>
#include "ath5k.h"
#include "debug.h"
#include "base.h"
#include "reg.h"

/* return bus cachesize in 4B word units */
static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
{
    *csz = L1_CACHE_BYTES >> 2;
}

static bool
ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
{
    struct ath5k_hw *ah = common->priv;
    struct platform_device *pdev = to_platform_device(ah->dev);
    struct ar231x_board_config *bcfg = pdev->dev.platform_data;
    u16 *eeprom, *eeprom_end;



    bcfg = pdev->dev.platform_data;
    eeprom = (u16 *) bcfg->radio;
    eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;

    eeprom += off;
    if (eeprom > eeprom_end)
        return false;

    *data = *eeprom;
    return true;
}

int ath5k_hw_read_srev(struct ath5k_hw *ah)
{
    struct platform_device *pdev = to_platform_device(ah->dev);
    struct ar231x_board_config *bcfg = pdev->dev.platform_data;
    ah->ah_mac_srev = bcfg->devid;
    return 0;
}

static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
{
    struct platform_device *pdev = to_platform_device(ah->dev);
    struct ar231x_board_config *bcfg = pdev->dev.platform_data;
    u8 *cfg_mac;

    if (to_platform_device(ah->dev)->id == 0)
        cfg_mac = bcfg->config->wlan0_mac;
    else
        cfg_mac = bcfg->config->wlan1_mac;

    memcpy(mac, cfg_mac, ETH_ALEN);
    return 0;
}

static const struct ath_bus_ops ath_ahb_bus_ops = {
    .ath_bus_type = ATH_AHB,
    .read_cachesize = ath5k_ahb_read_cachesize,
    .eeprom_read = ath5k_ahb_eeprom_read,
    .eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
};

/*Initialization*/
static int ath_ahb_probe(struct platform_device *pdev)
{
    struct ar231x_board_config *bcfg = pdev->dev.platform_data;
    struct ath5k_hw *ah;
    struct ieee80211_hw *hw;
    struct resource *res;
    void __iomem *mem;
    int irq;
    int ret = 0;
    u32 reg;

    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 ath5k_hw), &ath5k_hw_ops);
    if (hw == NULL) {
        dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
        ret = -ENOMEM;
        goto err_iounmap;
    }

    ah = hw->priv;
    ah->hw = hw;
    ah->dev = &pdev->dev;
    ah->iobase = mem;
    ah->irq = irq;
    ah->devid = bcfg->devid;

    if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
        /* Enable WMAC AHB arbitration */
        reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
        reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
        iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);

        /* Enable global WMAC swapping */
        reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
        reg |= AR5K_AR2315_BYTESWAP_WMAC;
        iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
    } else {
        /* Enable WMAC DMA access (assuming 5312 or 231x*/
        /* TODO: check other platforms */
        reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
        if (to_platform_device(ah->dev)->id == 0)
            reg |= AR5K_AR5312_ENABLE_WLAN0;
        else
            reg |= AR5K_AR5312_ENABLE_WLAN1;
        iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);

        /*
         * On a dual-band AR5312, the multiband radio is only
         * used as pass-through. Disable 2 GHz support in the
         * driver for it
         */
        if (to_platform_device(ah->dev)->id == 0 &&
            (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
             (BD_WLAN1 | BD_WLAN0))
            ah->ah_capabilities.cap_needs_2GHz_ovr = true;
        else
            ah->ah_capabilities.cap_needs_2GHz_ovr = false;
    }

    ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
    if (ret != 0) {
        dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
        ret = -ENODEV;
        goto err_free_hw;
    }

    platform_set_drvdata(pdev, hw);

    return 0;

 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 ar231x_board_config *bcfg = pdev->dev.platform_data;
    struct ieee80211_hw *hw = platform_get_drvdata(pdev);
    struct ath5k_hw *ah;
    u32 reg;

    if (!hw)
        return 0;

    ah = hw->priv;

    if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
        /* Disable WMAC AHB arbitration */
        reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
        reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
        iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
    } else {
        /*Stop DMA access */
        reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
        if (to_platform_device(ah->dev)->id == 0)
            reg &= ~AR5K_AR5312_ENABLE_WLAN0;
        else
            reg &= ~AR5K_AR5312_ENABLE_WLAN1;
        iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
    }

    ath5k_deinit_ah(ah);
    iounmap(ah->iobase);
    platform_set_drvdata(pdev, NULL);
    ieee80211_free_hw(hw);

    return 0;
}

static struct platform_driver ath_ahb_driver = {
    .probe      = ath_ahb_probe,
    .remove     = ath_ahb_remove,
    .driver     = {
        .name   = "ar231x-wmac",
        .owner  = THIS_MODULE,
    },
};

static int __init
ath5k_ahb_init(void)
{
    return platform_driver_register(&ath_ahb_driver);
}

static void __exit
ath5k_ahb_exit(void)
{
    platform_driver_unregister(&ath_ahb_driver);
}

module_init(ath5k_ahb_init);
module_exit(ath5k_ahb_exit);