/*
 * Copyright (c) 2008-2011 Atheros Communications Inc.
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/ath9k_platform.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/relay.h>
#include <linux/dmi.h>
#include <net/ieee80211_radiotap.h>

#include "ath9k.h"

struct ath9k_eeprom_ctx {
        struct completion complete;
        struct ath_hw *ah;
};

static char *dev_info = "ath9k";

MODULE_AUTHOR("Atheros Communications");
MODULE_DESCRIPTION("Support for Atheros 802.11n wireless LAN cards.");
MODULE_SUPPORTED_DEVICE("Atheros 802.11n WLAN cards");
MODULE_LICENSE("Dual BSD/GPL");

static unsigned int ath9k_debug = ATH_DBG_DEFAULT;
module_param_named(debug, ath9k_debug, uint, 0);
MODULE_PARM_DESC(debug, "Debugging mask");

int ath9k_modparam_nohwcrypt;
module_param_named(nohwcrypt, ath9k_modparam_nohwcrypt, int, 0444);
MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption");

int ath9k_led_blink;
module_param_named(blink, ath9k_led_blink, int, 0444);
MODULE_PARM_DESC(blink, "Enable LED blink on activity");

static int ath9k_led_active_high = -1;
module_param_named(led_active_high, ath9k_led_active_high, int, 0444);
MODULE_PARM_DESC(led_active_high, "Invert LED polarity");

static int ath9k_btcoex_enable;
module_param_named(btcoex_enable, ath9k_btcoex_enable, int, 0444);
MODULE_PARM_DESC(btcoex_enable, "Enable wifi-BT coexistence");

static int ath9k_bt_ant_diversity;
module_param_named(bt_ant_diversity, ath9k_bt_ant_diversity, int, 0444);
MODULE_PARM_DESC(bt_ant_diversity, "Enable WLAN/BT RX antenna diversity");

static int ath9k_ps_enable;
module_param_named(ps_enable, ath9k_ps_enable, int, 0444);
MODULE_PARM_DESC(ps_enable, "Enable WLAN PowerSave");

#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT

int ath9k_use_chanctx;
module_param_named(use_chanctx, ath9k_use_chanctx, int, 0444);
MODULE_PARM_DESC(use_chanctx, "Enable channel context for concurrency");

#endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */

int ath9k_use_msi;
module_param_named(use_msi, ath9k_use_msi, int, 0444);
MODULE_PARM_DESC(use_msi, "Use MSI instead of INTx if possible");

bool is_ath9k_unloaded;

#ifdef CONFIG_MAC80211_LEDS
static const struct ieee80211_tpt_blink ath9k_tpt_blink[] = {
        { .throughput = 0 * 1024, .blink_time = 334 },
        { .throughput = 1 * 1024, .blink_time = 260 },
        { .throughput = 5 * 1024, .blink_time = 220 },
        { .throughput = 10 * 1024, .blink_time = 190 },
        { .throughput = 20 * 1024, .blink_time = 170 },
        { .throughput = 50 * 1024, .blink_time = 150 },
        { .throughput = 70 * 1024, .blink_time = 130 },
        { .throughput = 100 * 1024, .blink_time = 110 },
        { .throughput = 200 * 1024, .blink_time = 80 },
        { .throughput = 300 * 1024, .blink_time = 50 },
};
#endif

static int __init set_use_msi(const struct dmi_system_id *dmi)
{
        ath9k_use_msi = 1;
        return 1;
}

static const struct dmi_system_id ath9k_quirks[] __initconst = {
        {
                .callback = set_use_msi,
                .ident = "Dell Inspiron 24-3460",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 24-3460"),
                },
        },
        {
                .callback = set_use_msi,
                .ident = "Dell Vostro 3262",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3262"),
                },
        },
        {
                .callback = set_use_msi,
                .ident = "Dell Inspiron 3472",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 3472"),
                },
        },
        {
                .callback = set_use_msi,
                .ident = "Dell Vostro 15-3572",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15-3572"),
                },
        },
        {
                .callback = set_use_msi,
                .ident = "Dell Inspiron 14-3473",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 14-3473"),
                },
        },
        {}
};

static void ath9k_deinit_softc(struct ath_softc *sc);

static void ath9k_op_ps_wakeup(struct ath_common *common)
{
        ath9k_ps_wakeup((struct ath_softc *) common->priv);
}

static void ath9k_op_ps_restore(struct ath_common *common)
{
        ath9k_ps_restore((struct ath_softc *) common->priv);
}

static const struct ath_ps_ops ath9k_ps_ops = {
        .wakeup = ath9k_op_ps_wakeup,
        .restore = ath9k_op_ps_restore,
};

/*
 * Read and write, they both share the same lock. We do this to serialize
 * reads and writes on Atheros 802.11n PCI devices only. This is required
 * as the FIFO on these devices can only accept sanely 2 requests.
 */

static void ath9k_iowrite32(void *hw_priv, u32 val, u32 reg_offset)
{
        struct ath_hw *ah = hw_priv;
        struct ath_common *common = ath9k_hw_common(ah);
        struct ath_softc *sc = (struct ath_softc *) common->priv;

        if (NR_CPUS > 1 && ah->config.serialize_regmode == SER_REG_MODE_ON) {
                unsigned long flags;
                spin_lock_irqsave(&sc->sc_serial_rw, flags);
                iowrite32(val, sc->mem + reg_offset);
                spin_unlock_irqrestore(&sc->sc_serial_rw, flags);
        } else
                iowrite32(val, sc->mem + reg_offset);
}

static unsigned int ath9k_ioread32(void *hw_priv, u32 reg_offset)
{
        struct ath_hw *ah = hw_priv;
        struct ath_common *common = ath9k_hw_common(ah);
        struct ath_softc *sc = (struct ath_softc *) common->priv;
        u32 val;

        if (NR_CPUS > 1 && ah->config.serialize_regmode == SER_REG_MODE_ON) {
                unsigned long flags;
                spin_lock_irqsave(&sc->sc_serial_rw, flags);
                val = ioread32(sc->mem + reg_offset);
                spin_unlock_irqrestore(&sc->sc_serial_rw, flags);
        } else
                val = ioread32(sc->mem + reg_offset);
        return val;
}

static void ath9k_multi_ioread32(void *hw_priv, u32 *addr,
                                u32 *val, u16 count)
{
        int i;

        for (i = 0; i < count; i++)
                val[i] = ath9k_ioread32(hw_priv, addr[i]);
}


static unsigned int __ath9k_reg_rmw(struct ath_softc *sc, u32 reg_offset,
                                    u32 set, u32 clr)
{
        u32 val;

        val = ioread32(sc->mem + reg_offset);
        val &= ~clr;
        val |= set;
        iowrite32(val, sc->mem + reg_offset);

        return val;
}

static unsigned int ath9k_reg_rmw(void *hw_priv, u32 reg_offset, u32 set, u32 clr)
{
        struct ath_hw *ah = hw_priv;
        struct ath_common *common = ath9k_hw_common(ah);
        struct ath_softc *sc = (struct ath_softc *) common->priv;
        unsigned long uninitialized_var(flags);
        u32 val;

        if (NR_CPUS > 1 && ah->config.serialize_regmode == SER_REG_MODE_ON) {
                spin_lock_irqsave(&sc->sc_serial_rw, flags);
                val = __ath9k_reg_rmw(sc, reg_offset, set, clr);
                spin_unlock_irqrestore(&sc->sc_serial_rw, flags);
        } else
                val = __ath9k_reg_rmw(sc, reg_offset, set, clr);

        return val;
}

/**************************/
/*     Initialization     */
/**************************/

static void ath9k_reg_notifier(struct wiphy *wiphy,
                               struct regulatory_request *request)
{
        struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
        struct ath_softc *sc = hw->priv;
        struct ath_hw *ah = sc->sc_ah;
        struct ath_regulatory *reg = ath9k_hw_regulatory(ah);

        ath_reg_notifier_apply(wiphy, request, reg);

        /* synchronize DFS detector if regulatory domain changed */
        if (sc->dfs_detector != NULL)
                sc->dfs_detector->set_dfs_domain(sc->dfs_detector,
                                                 request->dfs_region);

        /* Set tx power */
        if (!ah->curchan)
                return;

        sc->cur_chan->txpower = 2 * ah->curchan->chan->max_power;
        ath9k_ps_wakeup(sc);
        ath9k_hw_set_txpowerlimit(ah, sc->cur_chan->txpower, false);
        ath9k_cmn_update_txpow(ah, sc->cur_chan->cur_txpower,
                               sc->cur_chan->txpower,
                               &sc->cur_chan->cur_txpower);
        ath9k_ps_restore(sc);
}

/*
 *  This function will allocate both the DMA descriptor structure, and the
 *  buffers it contains.  These are used to contain the descriptors used
 *  by the system.
*/
int ath_descdma_setup(struct ath_softc *sc, struct ath_descdma *dd,
                      struct list_head *head, const char *name,
                      int nbuf, int ndesc, bool is_tx)
{
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
        u8 *ds;
        int i, bsize, desc_len;

        ath_dbg(common, CONFIG, "%s DMA: %u buffers %u desc/buf\n",
                name, nbuf, ndesc);

        INIT_LIST_HEAD(head);

        if (is_tx)
                desc_len = sc->sc_ah->caps.tx_desc_len;
        else
                desc_len = sizeof(struct ath_desc);

        /* ath_desc must be a multiple of DWORDs */
        if ((desc_len % 4) != 0) {
                ath_err(common, "ath_desc not DWORD aligned\n");
                BUG_ON((desc_len % 4) != 0);
                return -ENOMEM;
        }

        dd->dd_desc_len = desc_len * nbuf * ndesc;

        /*
         * Need additional DMA memory because we can't use
         * descriptors that cross the 4K page boundary. Assume
         * one skipped descriptor per 4K page.
         */
        if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_4KB_SPLITTRANS)) {
                u32 ndesc_skipped =
                        ATH_DESC_4KB_BOUND_NUM_SKIPPED(dd->dd_desc_len);
                u32 dma_len;

                while (ndesc_skipped) {
                        dma_len = ndesc_skipped * desc_len;
                        dd->dd_desc_len += dma_len;

                        ndesc_skipped = ATH_DESC_4KB_BOUND_NUM_SKIPPED(dma_len);
                }
        }

        /* allocate descriptors */
        dd->dd_desc = dmam_alloc_coherent(sc->dev, dd->dd_desc_len,
                                          &dd->dd_desc_paddr, GFP_KERNEL);
        if (!dd->dd_desc)
                return -ENOMEM;

        ds = dd->dd_desc;
        ath_dbg(common, CONFIG, "%s DMA map: %p (%u) -> %llx (%u)\n",
                name, ds, (u32) dd->dd_desc_len,
                ito64(dd->dd_desc_paddr), /*XXX*/(u32) dd->dd_desc_len);

        /* allocate buffers */
        if (is_tx) {
                struct ath_buf *bf;

                bsize = sizeof(struct ath_buf) * nbuf;
                bf = devm_kzalloc(sc->dev, bsize, GFP_KERNEL);
                if (!bf)
                        return -ENOMEM;

                for (i = 0; i < nbuf; i++, bf++, ds += (desc_len * ndesc)) {
                        bf->bf_desc = ds;
                        bf->bf_daddr = DS2PHYS(dd, ds);

                        if (!(sc->sc_ah->caps.hw_caps &
                                  ATH9K_HW_CAP_4KB_SPLITTRANS)) {
                                /*
                                 * Skip descriptor addresses which can cause 4KB
                                 * boundary crossing (addr + length) with a 32 dword
                                 * descriptor fetch.
                                 */
                                while (ATH_DESC_4KB_BOUND_CHECK(bf->bf_daddr)) {
                                        BUG_ON((caddr_t) bf->bf_desc >=
                                                   ((caddr_t) dd->dd_desc +
                                                dd->dd_desc_len));

                                        ds += (desc_len * ndesc);
                                        bf->bf_desc = ds;
                                        bf->bf_daddr = DS2PHYS(dd, ds);
                                }
                        }
                        list_add_tail(&bf->list, head);
                }
        } else {
                struct ath_rxbuf *bf;

                bsize = sizeof(struct ath_rxbuf) * nbuf;
                bf = devm_kzalloc(sc->dev, bsize, GFP_KERNEL);
                if (!bf)
                        return -ENOMEM;

                for (i = 0; i < nbuf; i++, bf++, ds += (desc_len * ndesc)) {
                        bf->bf_desc = ds;
                        bf->bf_daddr = DS2PHYS(dd, ds);

                        if (!(sc->sc_ah->caps.hw_caps &
                                  ATH9K_HW_CAP_4KB_SPLITTRANS)) {
                                /*
                                 * Skip descriptor addresses which can cause 4KB
                                 * boundary crossing (addr + length) with a 32 dword
                                 * descriptor fetch.
                                 */
                                while (ATH_DESC_4KB_BOUND_CHECK(bf->bf_daddr)) {
                                        BUG_ON((caddr_t) bf->bf_desc >=
                                                   ((caddr_t) dd->dd_desc +
                                                dd->dd_desc_len));

                                        ds += (desc_len * ndesc);
                                        bf->bf_desc = ds;
                                        bf->bf_daddr = DS2PHYS(dd, ds);
                                }
                        }
                        list_add_tail(&bf->list, head);
                }
        }
        return 0;
}

static int ath9k_init_queues(struct ath_softc *sc)
{
        int i = 0;

        sc->beacon.beaconq = ath9k_hw_beaconq_setup(sc->sc_ah);
        sc->beacon.cabq = ath_txq_setup(sc, ATH9K_TX_QUEUE_CAB, 0);
        ath_cabq_update(sc);

        sc->tx.uapsdq = ath_txq_setup(sc, ATH9K_TX_QUEUE_UAPSD, 0);

        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
                sc->tx.txq_map[i] = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, i);
                sc->tx.txq_map[i]->mac80211_qnum = i;
        }
        return 0;
}

static void ath9k_init_misc(struct ath_softc *sc)
{
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
        int i = 0;

        timer_setup(&common->ani.timer, ath_ani_calibrate, 0);

        common->last_rssi = ATH_RSSI_DUMMY_MARKER;
        eth_broadcast_addr(common->bssidmask);
        sc->beacon.slottime = 9;

        for (i = 0; i < ARRAY_SIZE(sc->beacon.bslot); i++)
                sc->beacon.bslot[i] = NULL;

        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)
                sc->ant_comb.count = ATH_ANT_DIV_COMB_INIT_COUNT;

        sc->spec_priv.ah = sc->sc_ah;
        sc->spec_priv.spec_config.enabled = 0;
        sc->spec_priv.spec_config.short_repeat = true;
        sc->spec_priv.spec_config.count = 8;
        sc->spec_priv.spec_config.endless = false;
        sc->spec_priv.spec_config.period = 0xFF;
        sc->spec_priv.spec_config.fft_period = 0xF;
}

static void ath9k_init_pcoem_platform(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;
        struct ath9k_hw_capabilities *pCap = &ah->caps;
        struct ath_common *common = ath9k_hw_common(ah);

        if (!IS_ENABLED(CONFIG_ATH9K_PCOEM))
                return;

        if (common->bus_ops->ath_bus_type != ATH_PCI)
                return;

        if (sc->driver_data & (ATH9K_PCI_CUS198 |
                               ATH9K_PCI_CUS230)) {
                ah->config.xlna_gpio = 9;
                ah->config.xatten_margin_cfg = true;
                ah->config.alt_mingainidx = true;
                ah->config.ant_ctrl_comm2g_switch_enable = 0x000BBB88;
                sc->ant_comb.low_rssi_thresh = 20;
                sc->ant_comb.fast_div_bias = 3;

                ath_info(common, "Set parameters for %s\n",
                         (sc->driver_data & ATH9K_PCI_CUS198) ?
                         "CUS198" : "CUS230");
        }

        if (sc->driver_data & ATH9K_PCI_CUS217)
                ath_info(common, "CUS217 card detected\n");

        if (sc->driver_data & ATH9K_PCI_CUS252)
                ath_info(common, "CUS252 card detected\n");

        if (sc->driver_data & ATH9K_PCI_AR9565_1ANT)
                ath_info(common, "WB335 1-ANT card detected\n");

        if (sc->driver_data & ATH9K_PCI_AR9565_2ANT)
                ath_info(common, "WB335 2-ANT card detected\n");

        if (sc->driver_data & ATH9K_PCI_KILLER)
                ath_info(common, "Killer Wireless card detected\n");

        /*
         * Some WB335 cards do not support antenna diversity. Since
         * we use a hardcoded value for AR9565 instead of using the
         * EEPROM/OTP data, remove the combining feature from
         * the HW capabilities bitmap.
         */
        if (sc->driver_data & (ATH9K_PCI_AR9565_1ANT | ATH9K_PCI_AR9565_2ANT)) {
                if (!(sc->driver_data & ATH9K_PCI_BT_ANT_DIV))
                        pCap->hw_caps &= ~ATH9K_HW_CAP_ANT_DIV_COMB;
        }

        if (sc->driver_data & ATH9K_PCI_BT_ANT_DIV) {
                pCap->hw_caps |= ATH9K_HW_CAP_BT_ANT_DIV;
                ath_info(common, "Set BT/WLAN RX diversity capability\n");
        }

        if (sc->driver_data & ATH9K_PCI_D3_L1_WAR) {
                ah->config.pcie_waen = 0x0040473b;
                ath_info(common, "Enable WAR for ASPM D3/L1\n");
        }

        /*
         * The default value of pll_pwrsave is 1.
         * For certain AR9485 cards, it is set to 0.
         * For AR9462, AR9565 it's set to 7.
         */
        ah->config.pll_pwrsave = 1;

        if (sc->driver_data & ATH9K_PCI_NO_PLL_PWRSAVE) {
                ah->config.pll_pwrsave = 0;
                ath_info(common, "Disable PLL PowerSave\n");
        }

        if (sc->driver_data & ATH9K_PCI_LED_ACT_HI)
                ah->config.led_active_high = true;
}

static void ath9k_eeprom_request_cb(const struct firmware *eeprom_blob,
                                    void *ctx)
{
        struct ath9k_eeprom_ctx *ec = ctx;

        if (eeprom_blob)
                ec->ah->eeprom_blob = eeprom_blob;

        complete(&ec->complete);
}

static int ath9k_eeprom_request(struct ath_softc *sc, const char *name)
{
        struct ath9k_eeprom_ctx ec;
        struct ath_hw *ah = sc->sc_ah;
        int err;

        /* try to load the EEPROM content asynchronously */
        init_completion(&ec.complete);
        ec.ah = sc->sc_ah;

        err = request_firmware_nowait(THIS_MODULE, 1, name, sc->dev, GFP_KERNEL,
                                      &ec, ath9k_eeprom_request_cb);
        if (err < 0) {
                ath_err(ath9k_hw_common(ah),
                        "EEPROM request failed\n");
                return err;
        }

        wait_for_completion(&ec.complete);

        if (!ah->eeprom_blob) {
                ath_err(ath9k_hw_common(ah),
                        "Unable to load EEPROM file %s\n", name);
                return -EINVAL;
        }

        return 0;
}

static void ath9k_eeprom_release(struct ath_softc *sc)
{
        release_firmware(sc->sc_ah->eeprom_blob);
}

static int ath9k_init_platform(struct ath_softc *sc)
{
        struct ath9k_platform_data *pdata = sc->dev->platform_data;
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
        int ret;

        if (!pdata)
                return 0;

        if (!pdata->use_eeprom) {
                ah->ah_flags &= ~AH_USE_EEPROM;
                ah->gpio_mask = pdata->gpio_mask;
                ah->gpio_val = pdata->gpio_val;
                ah->led_pin = pdata->led_pin;
                ah->is_clk_25mhz = pdata->is_clk_25mhz;
                ah->get_mac_revision = pdata->get_mac_revision;
                ah->external_reset = pdata->external_reset;
                ah->disable_2ghz = pdata->disable_2ghz;
                ah->disable_5ghz = pdata->disable_5ghz;

                if (!pdata->endian_check)
                        ah->ah_flags |= AH_NO_EEP_SWAP;
        }

        if (pdata->eeprom_name) {
                ret = ath9k_eeprom_request(sc, pdata->eeprom_name);
                if (ret)
                        return ret;
        }

        if (pdata->led_active_high)
                ah->config.led_active_high = true;

        if (pdata->tx_gain_buffalo)
                ah->config.tx_gain_buffalo = true;

        if (pdata->macaddr)
                ether_addr_copy(common->macaddr, pdata->macaddr);

        return 0;
}

static int ath9k_of_init(struct ath_softc *sc)
{
        struct device_node *np = sc->dev->of_node;
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
        enum ath_bus_type bus_type = common->bus_ops->ath_bus_type;
        const char *mac;
        char eeprom_name[100];
        int ret;

        if (!of_device_is_available(np))
                return 0;

        ath_dbg(common, CONFIG, "parsing configuration from OF node\n");

        if (of_property_read_bool(np, "qca,no-eeprom")) {
                /* ath9k-eeprom-<bus>-<id>.bin */
                scnprintf(eeprom_name, sizeof(eeprom_name),
                          "ath9k-eeprom-%s-%s.bin",
                          ath_bus_type_to_string(bus_type), dev_name(ah->dev));

                ret = ath9k_eeprom_request(sc, eeprom_name);
                if (ret)
                        return ret;
        }

        mac = of_get_mac_address(np);
        if (mac)
                ether_addr_copy(common->macaddr, mac);

        ah->ah_flags &= ~AH_USE_EEPROM;
        ah->ah_flags |= AH_NO_EEP_SWAP;

        return 0;
}

static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
                            const struct ath_bus_ops *bus_ops)
{
        struct ath_hw *ah = NULL;
        struct ath9k_hw_capabilities *pCap;
        struct ath_common *common;
        int ret = 0, i;
        int csz = 0;

        ah = devm_kzalloc(sc->dev, sizeof(struct ath_hw), GFP_KERNEL);
        if (!ah)
                return -ENOMEM;

        ah->dev = sc->dev;
        ah->hw = sc->hw;
        ah->hw_version.devid = devid;
        ah->ah_flags |= AH_USE_EEPROM;
        ah->led_pin = -1;
        ah->reg_ops.read = ath9k_ioread32;
        ah->reg_ops.multi_read = ath9k_multi_ioread32;
        ah->reg_ops.write = ath9k_iowrite32;
        ah->reg_ops.rmw = ath9k_reg_rmw;
        pCap = &ah->caps;

        common = ath9k_hw_common(ah);

        /* Will be cleared in ath9k_start() */
        set_bit(ATH_OP_INVALID, &common->op_flags);
        sc->airtime_flags = (AIRTIME_USE_TX | AIRTIME_USE_RX |
                             AIRTIME_USE_NEW_QUEUES);

        sc->sc_ah = ah;
        sc->dfs_detector = dfs_pattern_detector_init(common, NL80211_DFS_UNSET);
        sc->tx99_power = MAX_RATE_POWER + 1;
        init_waitqueue_head(&sc->tx_wait);
        sc->cur_chan = &sc->chanctx[0];
        if (!ath9k_is_chanctx_enabled())
                sc->cur_chan->hw_queue_base = 0;

        common->ops = &ah->reg_ops;
        common->bus_ops = bus_ops;
        common->ps_ops = &ath9k_ps_ops;
        common->ah = ah;
        common->hw = sc->hw;
        common->priv = sc;
        common->debug_mask = ath9k_debug;
        common->btcoex_enabled = ath9k_btcoex_enable == 1;
        common->disable_ani = false;

        /*
         * Platform quirks.
         */
        ath9k_init_pcoem_platform(sc);

        ret = ath9k_init_platform(sc);
        if (ret)
                return ret;

        ret = ath9k_of_init(sc);
        if (ret)
                return ret;

        if (ath9k_led_active_high != -1)
                ah->config.led_active_high = ath9k_led_active_high == 1;

        /*
         * Enable WLAN/BT RX Antenna diversity only when:
         *
         * - BTCOEX is disabled.
         * - the user manually requests the feature.
         * - the HW cap is set using the platform data.
         */
        if (!common->btcoex_enabled && ath9k_bt_ant_diversity &&
            (pCap->hw_caps & ATH9K_HW_CAP_BT_ANT_DIV))
                common->bt_ant_diversity = 1;

        spin_lock_init(&common->cc_lock);
        spin_lock_init(&sc->intr_lock);
        spin_lock_init(&sc->sc_serial_rw);
        spin_lock_init(&sc->sc_pm_lock);
        spin_lock_init(&sc->chan_lock);
        mutex_init(&sc->mutex);
        tasklet_init(&sc->intr_tq, ath9k_tasklet, (unsigned long)sc);
        tasklet_init(&sc->bcon_tasklet, ath9k_beacon_tasklet,
                     (unsigned long)sc);

        timer_setup(&sc->sleep_timer, ath_ps_full_sleep, 0);
        INIT_WORK(&sc->hw_reset_work, ath_reset_work);
        INIT_WORK(&sc->paprd_work, ath_paprd_calibrate);
        INIT_DELAYED_WORK(&sc->hw_pll_work, ath_hw_pll_work);
        INIT_DELAYED_WORK(&sc->hw_check_work, ath_hw_check_work);

        ath9k_init_channel_context(sc);

        /*
         * Cache line size is used to size and align various
         * structures used to communicate with the hardware.
         */
        ath_read_cachesize(common, &csz);
        common->cachelsz = csz << 2; /* convert to bytes */

        /* Initializes the hardware for all supported chipsets */
        ret = ath9k_hw_init(ah);
        if (ret)
                goto err_hw;

        ret = ath9k_init_queues(sc);
        if (ret)
                goto err_queues;

        ret =  ath9k_init_btcoex(sc);
        if (ret)
                goto err_btcoex;

        ret = ath9k_cmn_init_channels_rates(common);
        if (ret)
                goto err_btcoex;

        ret = ath9k_init_p2p(sc);
        if (ret)
                goto err_btcoex;

        ath9k_cmn_init_crypto(sc->sc_ah);
        ath9k_init_misc(sc);
        ath_chanctx_init(sc);
        ath9k_offchannel_init(sc);

        if (common->bus_ops->aspm_init)
                common->bus_ops->aspm_init(common);

        return 0;

err_btcoex:
        for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++)
                if (ATH_TXQ_SETUP(sc, i))
                        ath_tx_cleanupq(sc, &sc->tx.txq[i]);
err_queues:
        ath9k_hw_deinit(ah);
err_hw:
        ath9k_eeprom_release(sc);
        dev_kfree_skb_any(sc->tx99_skb);
        return ret;
}

static void ath9k_init_band_txpower(struct ath_softc *sc, int band)
{
        struct ieee80211_supported_band *sband;
        struct ieee80211_channel *chan;
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
        struct cfg80211_chan_def chandef;
        int i;

        sband = &common->sbands[band];
        for (i = 0; i < sband->n_channels; i++) {
                chan = &sband->channels[i];
                ah->curchan = &ah->channels[chan->hw_value];
                cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_HT20);
                ath9k_cmn_get_channel(sc->hw, ah, &chandef);
                ath9k_hw_set_txpowerlimit(ah, MAX_RATE_POWER, true);
        }
}

static void ath9k_init_txpower_limits(struct ath_softc *sc)
{
        struct ath_hw *ah = sc->sc_ah;
        struct ath9k_channel *curchan = ah->curchan;

        if (ah->caps.hw_caps & ATH9K_HW_CAP_2GHZ)
                ath9k_init_band_txpower(sc, NL80211_BAND_2GHZ);
        if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ)
                ath9k_init_band_txpower(sc, NL80211_BAND_5GHZ);

        ah->curchan = curchan;
}

static const struct ieee80211_iface_limit if_limits[] = {
        { .max = 2048,  .types = BIT(NL80211_IFTYPE_STATION) },
        { .max = 8,     .types =
#ifdef CONFIG_MAC80211_MESH
                                 BIT(NL80211_IFTYPE_MESH_POINT) |
#endif
                                 BIT(NL80211_IFTYPE_AP) },
        { .max = 1,     .types = BIT(NL80211_IFTYPE_P2P_CLIENT) |
                                 BIT(NL80211_IFTYPE_P2P_GO) },
};

#ifdef CONFIG_WIRELESS_WDS
static const struct ieee80211_iface_limit wds_limits[] = {
        { .max = 2048,  .types = BIT(NL80211_IFTYPE_WDS) },
};
#endif

#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT

static const struct ieee80211_iface_limit if_limits_multi[] = {
        { .max = 2,     .types = BIT(NL80211_IFTYPE_STATION) |
                                 BIT(NL80211_IFTYPE_AP) |
                                 BIT(NL80211_IFTYPE_P2P_CLIENT) |
                                 BIT(NL80211_IFTYPE_P2P_GO) },
        { .max = 1,     .types = BIT(NL80211_IFTYPE_ADHOC) },
        { .max = 1,     .types = BIT(NL80211_IFTYPE_P2P_DEVICE) },
};

static const struct ieee80211_iface_combination if_comb_multi[] = {
        {
                .limits = if_limits_multi,
                .n_limits = ARRAY_SIZE(if_limits_multi),
                .max_interfaces = 3,
                .num_different_channels = 2,
                .beacon_int_infra_match = true,
        },
};

#endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */

static const struct ieee80211_iface_combination if_comb[] = {
        {
                .limits = if_limits,
                .n_limits = ARRAY_SIZE(if_limits),
                .max_interfaces = 2048,
                .num_different_channels = 1,
                .beacon_int_infra_match = true,
#ifdef CONFIG_ATH9K_DFS_CERTIFIED
                .radar_detect_widths =  BIT(NL80211_CHAN_WIDTH_20_NOHT) |
                                        BIT(NL80211_CHAN_WIDTH_20) |
                                        BIT(NL80211_CHAN_WIDTH_40),
#endif
        },
#ifdef CONFIG_WIRELESS_WDS
        {
                .limits = wds_limits,
                .n_limits = ARRAY_SIZE(wds_limits),
                .max_interfaces = 2048,
                .num_different_channels = 1,
                .beacon_int_infra_match = true,
        },
#endif
};

#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
static void ath9k_set_mcc_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
{
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);

        if (!ath9k_is_chanctx_enabled())
                return;

        ieee80211_hw_set(hw, QUEUE_CONTROL);
        hw->queues = ATH9K_NUM_TX_QUEUES;
        hw->offchannel_tx_hw_queue = hw->queues - 1;
        hw->wiphy->interface_modes &= ~ BIT(NL80211_IFTYPE_WDS);
        hw->wiphy->iface_combinations = if_comb_multi;
        hw->wiphy->n_iface_combinations = ARRAY_SIZE(if_comb_multi);
        hw->wiphy->max_scan_ssids = 255;
        hw->wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
        hw->wiphy->max_remain_on_channel_duration = 10000;
        hw->chanctx_data_size = sizeof(void *);
        hw->extra_beacon_tailroom =
                sizeof(struct ieee80211_p2p_noa_attr) + 9;

        ath_dbg(common, CHAN_CTX, "Use channel contexts\n");
}
#endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */

static void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
{
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);

        ieee80211_hw_set(hw, SUPPORTS_HT_CCK_RATES);
        ieee80211_hw_set(hw, SUPPORTS_RC_TABLE);
        ieee80211_hw_set(hw, REPORTS_TX_ACK_STATUS);
        ieee80211_hw_set(hw, SPECTRUM_MGMT);
        ieee80211_hw_set(hw, PS_NULLFUNC_STACK);
        ieee80211_hw_set(hw, SIGNAL_DBM);
        ieee80211_hw_set(hw, RX_INCLUDES_FCS);
        ieee80211_hw_set(hw, HOST_BROADCAST_PS_BUFFERING);
        ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
        ieee80211_hw_set(hw, SUPPORTS_CLONED_SKBS);

        if (ath9k_ps_enable)
                ieee80211_hw_set(hw, SUPPORTS_PS);

        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) {
                ieee80211_hw_set(hw, AMPDU_AGGREGATION);

                if (AR_SREV_9280_20_OR_LATER(ah))
                        hw->radiotap_mcs_details |=
                                IEEE80211_RADIOTAP_MCS_HAVE_STBC;
        }

        if (AR_SREV_9160_10_OR_LATER(sc->sc_ah) || ath9k_modparam_nohwcrypt)
                ieee80211_hw_set(hw, MFP_CAPABLE);

        hw->wiphy->features |= NL80211_FEATURE_ACTIVE_MONITOR |
                               NL80211_FEATURE_AP_MODE_CHAN_WIDTH_CHANGE |
                               NL80211_FEATURE_P2P_GO_CTWIN;

        if (!IS_ENABLED(CONFIG_ATH9K_TX99)) {
                hw->wiphy->interface_modes =
                        BIT(NL80211_IFTYPE_P2P_GO) |
                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
                        BIT(NL80211_IFTYPE_AP) |
                        BIT(NL80211_IFTYPE_STATION) |
                        BIT(NL80211_IFTYPE_ADHOC) |
                        BIT(NL80211_IFTYPE_MESH_POINT) |
#ifdef CONFIG_WIRELESS_WDS
                        BIT(NL80211_IFTYPE_WDS) |
#endif
                        BIT(NL80211_IFTYPE_OCB);

                if (ath9k_is_chanctx_enabled())
                        hw->wiphy->interface_modes |=
                                        BIT(NL80211_IFTYPE_P2P_DEVICE);

                hw->wiphy->iface_combinations = if_comb;
                hw->wiphy->n_iface_combinations = ARRAY_SIZE(if_comb);
        }

        hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;

        hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
        hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS;
        hw->wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
        hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_5_10_MHZ;
        hw->wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
        hw->wiphy->flags |= WIPHY_FLAG_AP_UAPSD;

        hw->queues = 4;
        hw->max_rates = 4;
        hw->max_listen_interval = 10;
        hw->max_rate_tries = 10;
        hw->sta_data_size = sizeof(struct ath_node);
        hw->vif_data_size = sizeof(struct ath_vif);
        hw->txq_data_size = sizeof(struct ath_atx_tid);
        hw->extra_tx_headroom = 4;

        hw->wiphy->available_antennas_rx = BIT(ah->caps.max_rxchains) - 1;
        hw->wiphy->available_antennas_tx = BIT(ah->caps.max_txchains) - 1;

        /* single chain devices with rx diversity */
        if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)
                hw->wiphy->available_antennas_rx = BIT(0) | BIT(1);

        sc->ant_rx = hw->wiphy->available_antennas_rx;
        sc->ant_tx = hw->wiphy->available_antennas_tx;

        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_2GHZ)

                hw->wiphy->bands[NL80211_BAND_2GHZ] =
                        &common->sbands[NL80211_BAND_2GHZ];
        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ)
                hw->wiphy->bands[NL80211_BAND_5GHZ] =
                        &common->sbands[NL80211_BAND_5GHZ];

#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
        ath9k_set_mcc_capab(sc, hw);
#endif
        ath9k_init_wow(hw);
        ath9k_cmn_reload_chainmask(ah);

        SET_IEEE80211_PERM_ADDR(hw, common->macaddr);

        wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
}

int ath9k_init_device(u16 devid, struct ath_softc *sc,
                    const struct ath_bus_ops *bus_ops)
{
        struct ieee80211_hw *hw = sc->hw;
        struct ath_common *common;
        struct ath_hw *ah;
        int error = 0;
        struct ath_regulatory *reg;

        /* Bring up device */
        error = ath9k_init_softc(devid, sc, bus_ops);
        if (error)
                return error;

        ah = sc->sc_ah;
        common = ath9k_hw_common(ah);
        ath9k_set_hw_capab(sc, hw);

        /* Initialize regulatory */
        error = ath_regd_init(&common->regulatory, sc->hw->wiphy,
                              ath9k_reg_notifier);
        if (error)
                goto deinit;

        reg = &common->regulatory;

        /* Setup TX DMA */
        error = ath_tx_init(sc, ATH_TXBUF);
        if (error != 0)
                goto deinit;

        /* Setup RX DMA */
        error = ath_rx_init(sc, ATH_RXBUF);
        if (error != 0)
                goto deinit;

        ath9k_init_txpower_limits(sc);

#ifdef CONFIG_MAC80211_LEDS
        /* must be initialized before ieee80211_register_hw */
        sc->led_cdev.default_trigger = ieee80211_create_tpt_led_trigger(sc->hw,
                IEEE80211_TPT_LEDTRIG_FL_RADIO, ath9k_tpt_blink,
                ARRAY_SIZE(ath9k_tpt_blink));
#endif

        /* Register with mac80211 */
        error = ieee80211_register_hw(hw);
        if (error)
                goto rx_cleanup;

        error = ath9k_init_debug(ah);
        if (error) {
                ath_err(common, "Unable to create debugfs files\n");
                goto unregister;
        }

        /* Handle world regulatory */
        if (!ath_is_world_regd(reg)) {
                error = regulatory_hint(hw->wiphy, reg->alpha2);
                if (error)
                        goto debug_cleanup;
        }

        ath_init_leds(sc);
        ath_start_rfkill_poll(sc);

        return 0;

debug_cleanup:
        ath9k_deinit_debug(sc);
unregister:
        ieee80211_unregister_hw(hw);
rx_cleanup:
        ath_rx_cleanup(sc);
deinit:
        ath9k_deinit_softc(sc);
        return error;
}

/*****************************/
/*     De-Initialization     */
/*****************************/

static void ath9k_deinit_softc(struct ath_softc *sc)
{
        int i = 0;

        ath9k_deinit_p2p(sc);
        ath9k_deinit_btcoex(sc);

        for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++)
                if (ATH_TXQ_SETUP(sc, i))
                        ath_tx_cleanupq(sc, &sc->tx.txq[i]);

        del_timer_sync(&sc->sleep_timer);
        ath9k_hw_deinit(sc->sc_ah);
        if (sc->dfs_detector != NULL)
                sc->dfs_detector->exit(sc->dfs_detector);

        ath9k_eeprom_release(sc);
}

void ath9k_deinit_device(struct ath_softc *sc)
{
        struct ieee80211_hw *hw = sc->hw;

        ath9k_ps_wakeup(sc);

        wiphy_rfkill_stop_polling(sc->hw->wiphy);
        ath_deinit_leds(sc);

        ath9k_ps_restore(sc);

        ath9k_deinit_debug(sc);
        ath9k_deinit_wow(hw);
        ieee80211_unregister_hw(hw);
        ath_rx_cleanup(sc);
        ath9k_deinit_softc(sc);
}

/************************/
/*     Module Hooks     */
/************************/

static int __init ath9k_init(void)
{
        int error;

        error = ath_pci_init();
        if (error < 0) {
                pr_err("No PCI devices found, driver not installed\n");
                error = -ENODEV;
                goto err_out;
        }

        error = ath_ahb_init();
        if (error < 0) {
                error = -ENODEV;
                goto err_pci_exit;
        }

        dmi_check_system(ath9k_quirks);

        return 0;

 err_pci_exit:
        ath_pci_exit();
 err_out:
        return error;
}
module_init(ath9k_init);

static void __exit ath9k_exit(void)
{
        is_ath9k_unloaded = true;
        ath_ahb_exit();
        ath_pci_exit();
        pr_info("%s: Driver unloaded\n", dev_info);
}
module_exit(ath9k_exit);