/*      Copyright (C) 2009 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
 *      Copyright (C) 2009 Alban Browaeys <prahal@yahoo.com>
 *      Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
 *      Copyright (C) 2009 Luis Correia <luis.f.correia@gmail.com>
 *      Copyright (C) 2009 Mattias Nissler <mattias.nissler@gmx.de>
 *      Copyright (C) 2009 Mark Asselstine <asselsm@gmail.com>
 *      Copyright (C) 2009 Xose Vazquez Perez <xose.vazquez@gmail.com>
 *      Copyright (C) 2009 Bart Zolnierkiewicz <bzolnier@gmail.com>
 *      <http://rt2x00.serialmonkey.com>
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the
 *      Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*      Module: rt2800mmio
 *      Abstract: rt2800 MMIO device routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/export.h>

#include "rt2x00.h"
#include "rt2x00mmio.h"
#include "rt2800.h"
#include "rt2800lib.h"
#include "rt2800mmio.h"

/*
 * TX descriptor initialization
 */
__le32 *rt2800mmio_get_txwi(struct queue_entry *entry)
{
        return (__le32 *) entry->skb->data;
}
EXPORT_SYMBOL_GPL(rt2800mmio_get_txwi);

void rt2800mmio_write_tx_desc(struct queue_entry *entry,
                              struct txentry_desc *txdesc)
{
        struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
        struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
        __le32 *txd = entry_priv->desc;
        u32 word;
        const unsigned int txwi_size = entry->queue->winfo_size;

        /*
         * The buffers pointed by SD_PTR0/SD_LEN0 and SD_PTR1/SD_LEN1
         * must contains a TXWI structure + 802.11 header + padding + 802.11
         * data. We choose to have SD_PTR0/SD_LEN0 only contains TXWI and
         * SD_PTR1/SD_LEN1 contains 802.11 header + padding + 802.11
         * data. It means that LAST_SEC0 is always 0.
         */

        /*
         * Initialize TX descriptor
         */
        word = 0;
        rt2x00_set_field32(&word, TXD_W0_SD_PTR0, skbdesc->skb_dma);
        rt2x00_desc_write(txd, 0, word);

        word = 0;
        rt2x00_set_field32(&word, TXD_W1_SD_LEN1, entry->skb->len);
        rt2x00_set_field32(&word, TXD_W1_LAST_SEC1,
                           !test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W1_BURST,
                           test_bit(ENTRY_TXD_BURST, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W1_SD_LEN0, txwi_size);
        rt2x00_set_field32(&word, TXD_W1_LAST_SEC0, 0);
        rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 0);
        rt2x00_desc_write(txd, 1, word);

        word = 0;
        rt2x00_set_field32(&word, TXD_W2_SD_PTR1,
                           skbdesc->skb_dma + txwi_size);
        rt2x00_desc_write(txd, 2, word);

        word = 0;
        rt2x00_set_field32(&word, TXD_W3_WIV,
                           !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W3_QSEL, 2);
        rt2x00_desc_write(txd, 3, word);

        /*
         * Register descriptor details in skb frame descriptor.
         */
        skbdesc->desc = txd;
        skbdesc->desc_len = TXD_DESC_SIZE;
}
EXPORT_SYMBOL_GPL(rt2800mmio_write_tx_desc);

/*
 * RX control handlers
 */
void rt2800mmio_fill_rxdone(struct queue_entry *entry,
                            struct rxdone_entry_desc *rxdesc)
{
        struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
        __le32 *rxd = entry_priv->desc;
        u32 word;

        rt2x00_desc_read(rxd, 3, &word);

        if (rt2x00_get_field32(word, RXD_W3_CRC_ERROR))
                rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;

        /*
         * Unfortunately we don't know the cipher type used during
         * decryption. This prevents us from correct providing
         * correct statistics through debugfs.
         */
        rxdesc->cipher_status = rt2x00_get_field32(word, RXD_W3_CIPHER_ERROR);

        if (rt2x00_get_field32(word, RXD_W3_DECRYPTED)) {
                /*
                 * Hardware has stripped IV/EIV data from 802.11 frame during
                 * decryption. Unfortunately the descriptor doesn't contain
                 * any fields with the EIV/IV data either, so they can't
                 * be restored by rt2x00lib.
                 */
                rxdesc->flags |= RX_FLAG_IV_STRIPPED;

                /*
                 * The hardware has already checked the Michael Mic and has
                 * stripped it from the frame. Signal this to mac80211.
                 */
                rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;

                if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
                        rxdesc->flags |= RX_FLAG_DECRYPTED;
                else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
                        rxdesc->flags |= RX_FLAG_MMIC_ERROR;
        }

        if (rt2x00_get_field32(word, RXD_W3_MY_BSS))
                rxdesc->dev_flags |= RXDONE_MY_BSS;

        if (rt2x00_get_field32(word, RXD_W3_L2PAD))
                rxdesc->dev_flags |= RXDONE_L2PAD;

        /*
         * Process the RXWI structure that is at the start of the buffer.
         */
        rt2800_process_rxwi(entry, rxdesc);
}
EXPORT_SYMBOL_GPL(rt2800mmio_fill_rxdone);

/*
 * Interrupt functions.
 */
static void rt2800mmio_wakeup(struct rt2x00_dev *rt2x00dev)
{
        struct ieee80211_conf conf = { .flags = 0 };
        struct rt2x00lib_conf libconf = { .conf = &conf };

        rt2800_config(rt2x00dev, &libconf, IEEE80211_CONF_CHANGE_PS);
}

static bool rt2800mmio_txdone_entry_check(struct queue_entry *entry, u32 status)
{
        __le32 *txwi;
        u32 word;
        int wcid, tx_wcid;

        wcid = rt2x00_get_field32(status, TX_STA_FIFO_WCID);

        txwi = rt2800_drv_get_txwi(entry);
        rt2x00_desc_read(txwi, 1, &word);
        tx_wcid = rt2x00_get_field32(word, TXWI_W1_WIRELESS_CLI_ID);

        return (tx_wcid == wcid);
}

static bool rt2800mmio_txdone_find_entry(struct queue_entry *entry, void *data)
{
        u32 status = *(u32 *)data;

        /*
         * rt2800pci hardware might reorder frames when exchanging traffic
         * with multiple BA enabled STAs.
         *
         * For example, a tx queue
         *    [ STA1 | STA2 | STA1 | STA2 ]
         * can result in tx status reports
         *    [ STA1 | STA1 | STA2 | STA2 ]
         * when the hw decides to aggregate the frames for STA1 into one AMPDU.
         *
         * To mitigate this effect, associate the tx status to the first frame
         * in the tx queue with a matching wcid.
         */
        if (rt2800mmio_txdone_entry_check(entry, status) &&
            !test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
                /*
                 * Got a matching frame, associate the tx status with
                 * the frame
                 */
                entry->status = status;
                set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
                return true;
        }

        /* Check the next frame */
        return false;
}

static bool rt2800mmio_txdone_match_first(struct queue_entry *entry, void *data)
{
        u32 status = *(u32 *)data;

        /*
         * Find the first frame without tx status and assign this status to it
         * regardless if it matches or not.
         */
        if (!test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
                /*
                 * Got a matching frame, associate the tx status with
                 * the frame
                 */
                entry->status = status;
                set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
                return true;
        }

        /* Check the next frame */
        return false;
}
static bool rt2800mmio_txdone_release_entries(struct queue_entry *entry,
                                              void *data)
{
        if (test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
                rt2800_txdone_entry(entry, entry->status,
                                    rt2800mmio_get_txwi(entry));
                return false;
        }

        /* No more frames to release */
        return true;
}

static bool rt2800mmio_txdone(struct rt2x00_dev *rt2x00dev)
{
        struct data_queue *queue;
        u32 status;
        u8 qid;
        int max_tx_done = 16;

        while (kfifo_get(&rt2x00dev->txstatus_fifo, &status)) {
                qid = rt2x00_get_field32(status, TX_STA_FIFO_PID_QUEUE);
                if (unlikely(qid >= QID_RX)) {
                        /*
                         * Unknown queue, this shouldn't happen. Just drop
                         * this tx status.
                         */
                        rt2x00_warn(rt2x00dev, "Got TX status report with unexpected pid %u, dropping\n",
                                    qid);
                        break;
                }

                queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
                if (unlikely(queue == NULL)) {
                        /*
                         * The queue is NULL, this shouldn't happen. Stop
                         * processing here and drop the tx status
                         */
                        rt2x00_warn(rt2x00dev, "Got TX status for an unavailable queue %u, dropping\n",
                                    qid);
                        break;
                }

                if (unlikely(rt2x00queue_empty(queue))) {
                        /*
                         * The queue is empty. Stop processing here
                         * and drop the tx status.
                         */
                        rt2x00_warn(rt2x00dev, "Got TX status for an empty queue %u, dropping\n",
                                    qid);
                        break;
                }

                /*
                 * Let's associate this tx status with the first
                 * matching frame.
                 */
                if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
                                                Q_INDEX, &status,
                                                rt2800mmio_txdone_find_entry)) {
                        /*
                         * We cannot match the tx status to any frame, so just
                         * use the first one.
                         */
                        if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
                                                        Q_INDEX, &status,
                                                        rt2800mmio_txdone_match_first)) {
                                rt2x00_warn(rt2x00dev, "No frame found for TX status on queue %u, dropping\n",
                                            qid);
                                break;
                        }
                }

                /*
                 * Release all frames with a valid tx status.
                 */
                rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
                                           Q_INDEX, NULL,
                                           rt2800mmio_txdone_release_entries);

                if (--max_tx_done == 0)
                        break;
        }

        return !max_tx_done;
}

static inline void rt2800mmio_enable_interrupt(struct rt2x00_dev *rt2x00dev,
                                               struct rt2x00_field32 irq_field)
{
        u32 reg;

        /*
         * Enable a single interrupt. The interrupt mask register
         * access needs locking.
         */
        spin_lock_irq(&rt2x00dev->irqmask_lock);
        rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
        rt2x00_set_field32(&reg, irq_field, 1);
        rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
        spin_unlock_irq(&rt2x00dev->irqmask_lock);
}

void rt2800mmio_txstatus_tasklet(unsigned long data)
{
        struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
        if (rt2800mmio_txdone(rt2x00dev))
                tasklet_schedule(&rt2x00dev->txstatus_tasklet);

        /*
         * No need to enable the tx status interrupt here as we always
         * leave it enabled to minimize the possibility of a tx status
         * register overflow. See comment in interrupt handler.
         */
}
EXPORT_SYMBOL_GPL(rt2800mmio_txstatus_tasklet);

void rt2800mmio_pretbtt_tasklet(unsigned long data)
{
        struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
        rt2x00lib_pretbtt(rt2x00dev);
        if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
                rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_PRE_TBTT);
}
EXPORT_SYMBOL_GPL(rt2800mmio_pretbtt_tasklet);

void rt2800mmio_tbtt_tasklet(unsigned long data)
{
        struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
        struct rt2800_drv_data *drv_data = rt2x00dev->drv_data;
        u32 reg;

        rt2x00lib_beacondone(rt2x00dev);

        if (rt2x00dev->intf_ap_count) {
                /*
                 * The rt2800pci hardware tbtt timer is off by 1us per tbtt
                 * causing beacon skew and as a result causing problems with
                 * some powersaving clients over time. Shorten the beacon
                 * interval every 64 beacons by 64us to mitigate this effect.
                 */
                if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 2)) {
                        rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
                        rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
                                           (rt2x00dev->beacon_int * 16) - 1);
                        rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
                } else if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 1)) {
                        rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
                        rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
                                           (rt2x00dev->beacon_int * 16));
                        rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
                }
                drv_data->tbtt_tick++;
                drv_data->tbtt_tick %= BCN_TBTT_OFFSET;
        }

        if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
                rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_TBTT);
}
EXPORT_SYMBOL_GPL(rt2800mmio_tbtt_tasklet);

void rt2800mmio_rxdone_tasklet(unsigned long data)
{
        struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
        if (rt2x00mmio_rxdone(rt2x00dev))
                tasklet_schedule(&rt2x00dev->rxdone_tasklet);
        else if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
                rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_RX_DONE);
}
EXPORT_SYMBOL_GPL(rt2800mmio_rxdone_tasklet);

void rt2800mmio_autowake_tasklet(unsigned long data)
{
        struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
        rt2800mmio_wakeup(rt2x00dev);
        if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
                rt2800mmio_enable_interrupt(rt2x00dev,
                                            INT_MASK_CSR_AUTO_WAKEUP);
}
EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);

static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev)
{
        u32 status;
        int i;

        /*
         * The TX_FIFO_STATUS interrupt needs special care. We should
         * read TX_STA_FIFO but we should do it immediately as otherwise
         * the register can overflow and we would lose status reports.
         *
         * Hence, read the TX_STA_FIFO register and copy all tx status
         * reports into a kernel FIFO which is handled in the txstatus
         * tasklet. We use a tasklet to process the tx status reports
         * because we can schedule the tasklet multiple times (when the
         * interrupt fires again during tx status processing).
         *
         * Furthermore we don't disable the TX_FIFO_STATUS
         * interrupt here but leave it enabled so that the TX_STA_FIFO
         * can also be read while the tx status tasklet gets executed.
         *
         * Since we have only one producer and one consumer we don't
         * need to lock the kfifo.
         */
        for (i = 0; i < rt2x00dev->tx->limit; i++) {
                rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO, &status);

                if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID))
                        break;

                if (!kfifo_put(&rt2x00dev->txstatus_fifo, status)) {
                        rt2x00_warn(rt2x00dev, "TX status FIFO overrun, drop tx status report\n");
                        break;
                }
        }

        /* Schedule the tasklet for processing the tx status. */
        tasklet_schedule(&rt2x00dev->txstatus_tasklet);
}

irqreturn_t rt2800mmio_interrupt(int irq, void *dev_instance)
{
        struct rt2x00_dev *rt2x00dev = dev_instance;
        u32 reg, mask;

        /* Read status and ACK all interrupts */
        rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
        rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);

        if (!reg)
                return IRQ_NONE;

        if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
                return IRQ_HANDLED;

        /*
         * Since INT_MASK_CSR and INT_SOURCE_CSR use the same bits
         * for interrupts and interrupt masks we can just use the value of
         * INT_SOURCE_CSR to create the interrupt mask.
         */
        mask = ~reg;

        if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) {
                rt2800mmio_txstatus_interrupt(rt2x00dev);
                /*
                 * Never disable the TX_FIFO_STATUS interrupt.
                 */
                rt2x00_set_field32(&mask, INT_MASK_CSR_TX_FIFO_STATUS, 1);
        }

        if (rt2x00_get_field32(reg, INT_SOURCE_CSR_PRE_TBTT))
                tasklet_hi_schedule(&rt2x00dev->pretbtt_tasklet);

        if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TBTT))
                tasklet_hi_schedule(&rt2x00dev->tbtt_tasklet);

        if (rt2x00_get_field32(reg, INT_SOURCE_CSR_RX_DONE))
                tasklet_schedule(&rt2x00dev->rxdone_tasklet);

        if (rt2x00_get_field32(reg, INT_SOURCE_CSR_AUTO_WAKEUP))
                tasklet_schedule(&rt2x00dev->autowake_tasklet);

        /*
         * Disable all interrupts for which a tasklet was scheduled right now,
         * the tasklet will reenable the appropriate interrupts.
         */
        spin_lock(&rt2x00dev->irqmask_lock);
        rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
        reg &= mask;
        rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
        spin_unlock(&rt2x00dev->irqmask_lock);

        return IRQ_HANDLED;
}
EXPORT_SYMBOL_GPL(rt2800mmio_interrupt);

void rt2800mmio_toggle_irq(struct rt2x00_dev *rt2x00dev,
                           enum dev_state state)
{
        u32 reg;
        unsigned long flags;

        /*
         * When interrupts are being enabled, the interrupt registers
         * should clear the register to assure a clean state.
         */
        if (state == STATE_RADIO_IRQ_ON) {
                rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
                rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
        }

        spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
        reg = 0;
        if (state == STATE_RADIO_IRQ_ON) {
                rt2x00_set_field32(&reg, INT_MASK_CSR_RX_DONE, 1);
                rt2x00_set_field32(&reg, INT_MASK_CSR_TBTT, 1);
                rt2x00_set_field32(&reg, INT_MASK_CSR_PRE_TBTT, 1);
                rt2x00_set_field32(&reg, INT_MASK_CSR_TX_FIFO_STATUS, 1);
                rt2x00_set_field32(&reg, INT_MASK_CSR_AUTO_WAKEUP, 1);
        }
        rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
        spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);

        if (state == STATE_RADIO_IRQ_OFF) {
                /*
                 * Wait for possibly running tasklets to finish.
                 */
                tasklet_kill(&rt2x00dev->txstatus_tasklet);
                tasklet_kill(&rt2x00dev->rxdone_tasklet);
                tasklet_kill(&rt2x00dev->autowake_tasklet);
                tasklet_kill(&rt2x00dev->tbtt_tasklet);
                tasklet_kill(&rt2x00dev->pretbtt_tasklet);
        }
}
EXPORT_SYMBOL_GPL(rt2800mmio_toggle_irq);

/*
 * Queue handlers.
 */
void rt2800mmio_start_queue(struct data_queue *queue)
{
        struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
        u32 reg;

        switch (queue->qid) {
        case QID_RX:
                rt2x00mmio_register_read(rt2x00dev, MAC_SYS_CTRL, &reg);
                rt2x00_set_field32(&reg, MAC_SYS_CTRL_ENABLE_RX, 1);
                rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
                break;
        case QID_BEACON:
                rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
                rt2x00_set_field32(&reg, BCN_TIME_CFG_TSF_TICKING, 1);
                rt2x00_set_field32(&reg, BCN_TIME_CFG_TBTT_ENABLE, 1);
                rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_GEN, 1);
                rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);

                rt2x00mmio_register_read(rt2x00dev, INT_TIMER_EN, &reg);
                rt2x00_set_field32(&reg, INT_TIMER_EN_PRE_TBTT_TIMER, 1);
                rt2x00mmio_register_write(rt2x00dev, INT_TIMER_EN, reg);
                break;
        default:
                break;
        }
}
EXPORT_SYMBOL_GPL(rt2800mmio_start_queue);

void rt2800mmio_kick_queue(struct data_queue *queue)
{
        struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
        struct queue_entry *entry;

        switch (queue->qid) {
        case QID_AC_VO:
        case QID_AC_VI:
        case QID_AC_BE:
        case QID_AC_BK:
                entry = rt2x00queue_get_entry(queue, Q_INDEX);
                rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX(queue->qid),
                                          entry->entry_idx);
                break;
        case QID_MGMT:
                entry = rt2x00queue_get_entry(queue, Q_INDEX);
                rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX(5),
                                          entry->entry_idx);
                break;
        default:
                break;
        }
}
EXPORT_SYMBOL_GPL(rt2800mmio_kick_queue);

void rt2800mmio_stop_queue(struct data_queue *queue)
{
        struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
        u32 reg;

        switch (queue->qid) {
        case QID_RX:
                rt2x00mmio_register_read(rt2x00dev, MAC_SYS_CTRL, &reg);
                rt2x00_set_field32(&reg, MAC_SYS_CTRL_ENABLE_RX, 0);
                rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
                break;
        case QID_BEACON:
                rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
                rt2x00_set_field32(&reg, BCN_TIME_CFG_TSF_TICKING, 0);
                rt2x00_set_field32(&reg, BCN_TIME_CFG_TBTT_ENABLE, 0);
                rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_GEN, 0);
                rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);

                rt2x00mmio_register_read(rt2x00dev, INT_TIMER_EN, &reg);
                rt2x00_set_field32(&reg, INT_TIMER_EN_PRE_TBTT_TIMER, 0);
                rt2x00mmio_register_write(rt2x00dev, INT_TIMER_EN, reg);

                /*
                 * Wait for current invocation to finish. The tasklet
                 * won't be scheduled anymore afterwards since we disabled
                 * the TBTT and PRE TBTT timer.
                 */
                tasklet_kill(&rt2x00dev->tbtt_tasklet);
                tasklet_kill(&rt2x00dev->pretbtt_tasklet);

                break;
        default:
                break;
        }
}
EXPORT_SYMBOL_GPL(rt2800mmio_stop_queue);

void rt2800mmio_queue_init(struct data_queue *queue)
{
        struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
        unsigned short txwi_size, rxwi_size;

        rt2800_get_txwi_rxwi_size(rt2x00dev, &txwi_size, &rxwi_size);

        switch (queue->qid) {
        case QID_RX:
                queue->limit = 128;
                queue->data_size = AGGREGATION_SIZE;
                queue->desc_size = RXD_DESC_SIZE;
                queue->winfo_size = rxwi_size;
                queue->priv_size = sizeof(struct queue_entry_priv_mmio);
                break;

        case QID_AC_VO:
        case QID_AC_VI:
        case QID_AC_BE:
        case QID_AC_BK:
                queue->limit = 64;
                queue->data_size = AGGREGATION_SIZE;
                queue->desc_size = TXD_DESC_SIZE;
                queue->winfo_size = txwi_size;
                queue->priv_size = sizeof(struct queue_entry_priv_mmio);
                break;

        case QID_BEACON:
                queue->limit = 8;
                queue->data_size = 0; /* No DMA required for beacons */
                queue->desc_size = TXD_DESC_SIZE;
                queue->winfo_size = txwi_size;
                queue->priv_size = sizeof(struct queue_entry_priv_mmio);
                break;

        case QID_ATIM:
                /* fallthrough */
        default:
                BUG();
                break;
        }
}
EXPORT_SYMBOL_GPL(rt2800mmio_queue_init);

/*
 * Initialization functions.
 */
bool rt2800mmio_get_entry_state(struct queue_entry *entry)
{
        struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
        u32 word;

        if (entry->queue->qid == QID_RX) {
                rt2x00_desc_read(entry_priv->desc, 1, &word);

                return (!rt2x00_get_field32(word, RXD_W1_DMA_DONE));
        } else {
                rt2x00_desc_read(entry_priv->desc, 1, &word);

                return (!rt2x00_get_field32(word, TXD_W1_DMA_DONE));
        }
}
EXPORT_SYMBOL_GPL(rt2800mmio_get_entry_state);

void rt2800mmio_clear_entry(struct queue_entry *entry)
{
        struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
        struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
        struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
        u32 word;

        if (entry->queue->qid == QID_RX) {
                rt2x00_desc_read(entry_priv->desc, 0, &word);
                rt2x00_set_field32(&word, RXD_W0_SDP0, skbdesc->skb_dma);
                rt2x00_desc_write(entry_priv->desc, 0, word);

                rt2x00_desc_read(entry_priv->desc, 1, &word);
                rt2x00_set_field32(&word, RXD_W1_DMA_DONE, 0);
                rt2x00_desc_write(entry_priv->desc, 1, word);

                /*
                 * Set RX IDX in register to inform hardware that we have
                 * handled this entry and it is available for reuse again.
                 */
                rt2x00mmio_register_write(rt2x00dev, RX_CRX_IDX,
                                          entry->entry_idx);
        } else {
                rt2x00_desc_read(entry_priv->desc, 1, &word);
                rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 1);
                rt2x00_desc_write(entry_priv->desc, 1, word);
        }
}
EXPORT_SYMBOL_GPL(rt2800mmio_clear_entry);

int rt2800mmio_init_queues(struct rt2x00_dev *rt2x00dev)
{
        struct queue_entry_priv_mmio *entry_priv;

        /*
         * Initialize registers.
         */
        entry_priv = rt2x00dev->tx[0].entries[0].priv_data;
        rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR0,
                                  entry_priv->desc_dma);
        rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT0,
                                  rt2x00dev->tx[0].limit);
        rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX0, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX0, 0);

        entry_priv = rt2x00dev->tx[1].entries[0].priv_data;
        rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR1,
                                  entry_priv->desc_dma);
        rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT1,
                                  rt2x00dev->tx[1].limit);
        rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX1, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX1, 0);

        entry_priv = rt2x00dev->tx[2].entries[0].priv_data;
        rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR2,
                                  entry_priv->desc_dma);
        rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT2,
                                  rt2x00dev->tx[2].limit);
        rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX2, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX2, 0);

        entry_priv = rt2x00dev->tx[3].entries[0].priv_data;
        rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR3,
                                  entry_priv->desc_dma);
        rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT3,
                                  rt2x00dev->tx[3].limit);
        rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX3, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX3, 0);

        rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR4, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT4, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX4, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX4, 0);

        rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR5, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT5, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX5, 0);
        rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX5, 0);

        entry_priv = rt2x00dev->rx->entries[0].priv_data;
        rt2x00mmio_register_write(rt2x00dev, RX_BASE_PTR,
                                  entry_priv->desc_dma);
        rt2x00mmio_register_write(rt2x00dev, RX_MAX_CNT,
                                  rt2x00dev->rx[0].limit);
        rt2x00mmio_register_write(rt2x00dev, RX_CRX_IDX,
                                  rt2x00dev->rx[0].limit - 1);
        rt2x00mmio_register_write(rt2x00dev, RX_DRX_IDX, 0);

        rt2800_disable_wpdma(rt2x00dev);

        rt2x00mmio_register_write(rt2x00dev, DELAY_INT_CFG, 0);

        return 0;
}
EXPORT_SYMBOL_GPL(rt2800mmio_init_queues);

int rt2800mmio_init_registers(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;

        /*
         * Reset DMA indexes
         */
        rt2x00mmio_register_read(rt2x00dev, WPDMA_RST_IDX, &reg);
        rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX0, 1);
        rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX1, 1);
        rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX2, 1);
        rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX3, 1);
        rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX4, 1);
        rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX5, 1);
        rt2x00_set_field32(&reg, WPDMA_RST_IDX_DRX_IDX0, 1);
        rt2x00mmio_register_write(rt2x00dev, WPDMA_RST_IDX, reg);

        rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e1f);
        rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e00);

        if (rt2x00_is_pcie(rt2x00dev) &&
            (rt2x00_rt(rt2x00dev, RT3090) ||
             rt2x00_rt(rt2x00dev, RT3390) ||
             rt2x00_rt(rt2x00dev, RT3572) ||
             rt2x00_rt(rt2x00dev, RT3593) ||
             rt2x00_rt(rt2x00dev, RT5390) ||
             rt2x00_rt(rt2x00dev, RT5392) ||
             rt2x00_rt(rt2x00dev, RT5592))) {
                rt2x00mmio_register_read(rt2x00dev, AUX_CTRL, &reg);
                rt2x00_set_field32(&reg, AUX_CTRL_FORCE_PCIE_CLK, 1);
                rt2x00_set_field32(&reg, AUX_CTRL_WAKE_PCIE_EN, 1);
                rt2x00mmio_register_write(rt2x00dev, AUX_CTRL, reg);
        }

        rt2x00mmio_register_write(rt2x00dev, PWR_PIN_CFG, 0x00000003);

        reg = 0;
        rt2x00_set_field32(&reg, MAC_SYS_CTRL_RESET_CSR, 1);
        rt2x00_set_field32(&reg, MAC_SYS_CTRL_RESET_BBP, 1);
        rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);

        rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, 0x00000000);

        return 0;
}
EXPORT_SYMBOL_GPL(rt2800mmio_init_registers);

/*
 * Device state switch handlers.
 */
int rt2800mmio_enable_radio(struct rt2x00_dev *rt2x00dev)
{
        /* Wait for DMA, ignore error until we initialize queues. */
        rt2800_wait_wpdma_ready(rt2x00dev);

        if (unlikely(rt2800mmio_init_queues(rt2x00dev)))
                return -EIO;

        return rt2800_enable_radio(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2800mmio_enable_radio);

MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2800 MMIO library");
MODULE_LICENSE("GPL");