treewide: remove redundant IS_ERR() before error code check

[linux/fpc-iii.git] / drivers / net / wireless / ath / ath9k / ar9003_wow.c

/*
 * Copyright (c) 2012 Qualcomm Atheros, 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.
 */

#include <linux/export.h>
#include "ath9k.h"
#include "reg.h"
#include "reg_wow.h"
#include "hw-ops.h"

static void ath9k_hw_set_sta_powersave(struct ath_hw *ah)
{
        if (!ath9k_hw_mci_is_enabled(ah))
                goto set;
        /*
         * If MCI is being used, set PWR_SAV only when MCI's
         * PS state is disabled.
         */
        if (ar9003_mci_state(ah, MCI_STATE_GET_WLAN_PS_STATE) != MCI_PS_DISABLE)
                return;
set:
        REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
}

static void ath9k_hw_set_powermode_wow_sleep(struct ath_hw *ah)
{
        struct ath_common *common = ath9k_hw_common(ah);

        ath9k_hw_set_sta_powersave(ah);

        /* set rx disable bit */
        REG_WRITE(ah, AR_CR, AR_CR_RXD);

        if (!ath9k_hw_wait(ah, AR_CR, AR_CR_RXE, 0, AH_WAIT_TIMEOUT)) {
                ath_err(common, "Failed to stop Rx DMA in 10ms AR_CR=0x%08x AR_DIAG_SW=0x%08x\n",
                        REG_READ(ah, AR_CR), REG_READ(ah, AR_DIAG_SW));
                return;
        }

        if (AR_SREV_9462(ah) || AR_SREV_9565(ah)) {
                if (!REG_READ(ah, AR_MAC_PCU_GEN_TIMER_TSF_SEL))
                        REG_CLR_BIT(ah, AR_DIRECT_CONNECT, AR_DC_TSF2_ENABLE);
        } else if (AR_SREV_9485(ah)){
                if (!(REG_READ(ah, AR_NDP2_TIMER_MODE) &
                      AR_GEN_TIMERS2_MODE_ENABLE_MASK))
                        REG_CLR_BIT(ah, AR_DIRECT_CONNECT, AR_DC_TSF2_ENABLE);
        }

        if (ath9k_hw_mci_is_enabled(ah))
                REG_WRITE(ah, AR_RTC_KEEP_AWAKE, 0x2);

        REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_ON_INT);
}

static void ath9k_wow_create_keep_alive_pattern(struct ath_hw *ah)
{
        struct ath_common *common = ath9k_hw_common(ah);
        u8 sta_mac_addr[ETH_ALEN], ap_mac_addr[ETH_ALEN];
        u32 ctl[13] = {0};
        u32 data_word[KAL_NUM_DATA_WORDS];
        u8 i;
        u32 wow_ka_data_word0;

        memcpy(sta_mac_addr, common->macaddr, ETH_ALEN);
        memcpy(ap_mac_addr, common->curbssid, ETH_ALEN);

        /* set the transmit buffer */
        ctl[0] = (KAL_FRAME_LEN | (MAX_RATE_POWER << 16));
        ctl[1] = 0;
        ctl[4] = 0;
        ctl[7] = (ah->txchainmask) << 2;
        ctl[2] = 0xf << 16; /* tx_tries 0 */

        if (IS_CHAN_2GHZ(ah->curchan))
                ctl[3] = 0x1b;  /* CCK_1M */
        else
                ctl[3] = 0xb;   /* OFDM_6M */

        for (i = 0; i < KAL_NUM_DESC_WORDS; i++)
                REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + i * 4), ctl[i]);

        data_word[0] = (KAL_FRAME_TYPE << 2) | (KAL_FRAME_SUB_TYPE << 4) |
                       (KAL_TO_DS << 8) | (KAL_DURATION_ID << 16);
        data_word[1] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) |
                       (ap_mac_addr[1] << 8) | (ap_mac_addr[0]);
        data_word[2] = (sta_mac_addr[1] << 24) | (sta_mac_addr[0] << 16) |
                       (ap_mac_addr[5] << 8) | (ap_mac_addr[4]);
        data_word[3] = (sta_mac_addr[5] << 24) | (sta_mac_addr[4] << 16) |
                       (sta_mac_addr[3] << 8) | (sta_mac_addr[2]);
        data_word[4] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) |
                       (ap_mac_addr[1] << 8) | (ap_mac_addr[0]);
        data_word[5] = (ap_mac_addr[5] << 8) | (ap_mac_addr[4]);

        if (AR_SREV_9462_20_OR_LATER(ah) || AR_SREV_9565(ah)) {
                /*
                 * AR9462 2.0 and AR9565 have an extra descriptor word
                 * (time based discard) compared to other chips.
                 */
                REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + (12 * 4)), 0);
                wow_ka_data_word0 = AR_WOW_TXBUF(13);
        } else {
                wow_ka_data_word0 = AR_WOW_TXBUF(12);
        }

        for (i = 0; i < KAL_NUM_DATA_WORDS; i++)
                REG_WRITE(ah, (wow_ka_data_word0 + i*4), data_word[i]);
}

int ath9k_hw_wow_apply_pattern(struct ath_hw *ah, u8 *user_pattern,
                               u8 *user_mask, int pattern_count,
                               int pattern_len)
{
        int i;
        u32 pattern_val, mask_val;
        u32 set, clr;

        if (pattern_count >= ah->wow.max_patterns)
                return -ENOSPC;

        if (pattern_count < MAX_NUM_PATTERN_LEGACY)
                REG_SET_BIT(ah, AR_WOW_PATTERN, BIT(pattern_count));
        else
                REG_SET_BIT(ah, AR_MAC_PCU_WOW4, BIT(pattern_count - 8));

        for (i = 0; i < MAX_PATTERN_SIZE; i += 4) {
                memcpy(&pattern_val, user_pattern, 4);
                REG_WRITE(ah, (AR_WOW_TB_PATTERN(pattern_count) + i),
                          pattern_val);
                user_pattern += 4;
        }

        for (i = 0; i < MAX_PATTERN_MASK_SIZE; i += 4) {
                memcpy(&mask_val, user_mask, 4);
                REG_WRITE(ah, (AR_WOW_TB_MASK(pattern_count) + i), mask_val);
                user_mask += 4;
        }

        if (pattern_count < MAX_NUM_PATTERN_LEGACY)
                ah->wow.wow_event_mask |=
                        BIT(pattern_count + AR_WOW_PAT_FOUND_SHIFT);
        else
                ah->wow.wow_event_mask2 |=
                        BIT((pattern_count - 8) + AR_WOW_PAT_FOUND_SHIFT);

        if (pattern_count < 4) {
                set = (pattern_len & AR_WOW_LENGTH_MAX) <<
                       AR_WOW_LEN1_SHIFT(pattern_count);
                clr = AR_WOW_LENGTH1_MASK(pattern_count);
                REG_RMW(ah, AR_WOW_LENGTH1, set, clr);
        } else if (pattern_count < 8) {
                set = (pattern_len & AR_WOW_LENGTH_MAX) <<
                       AR_WOW_LEN2_SHIFT(pattern_count);
                clr = AR_WOW_LENGTH2_MASK(pattern_count);
                REG_RMW(ah, AR_WOW_LENGTH2, set, clr);
        } else if (pattern_count < 12) {
                set = (pattern_len & AR_WOW_LENGTH_MAX) <<
                       AR_WOW_LEN3_SHIFT(pattern_count);
                clr = AR_WOW_LENGTH3_MASK(pattern_count);
                REG_RMW(ah, AR_WOW_LENGTH3, set, clr);
        } else if (pattern_count < MAX_NUM_PATTERN) {
                set = (pattern_len & AR_WOW_LENGTH_MAX) <<
                       AR_WOW_LEN4_SHIFT(pattern_count);
                clr = AR_WOW_LENGTH4_MASK(pattern_count);
                REG_RMW(ah, AR_WOW_LENGTH4, set, clr);
        }

        return 0;
}
EXPORT_SYMBOL(ath9k_hw_wow_apply_pattern);

u32 ath9k_hw_wow_wakeup(struct ath_hw *ah)
{
        u32 wow_status = 0;
        u32 val = 0, rval;

        /*
         * Read the WoW status register to know
         * the wakeup reason.
         */
        rval = REG_READ(ah, AR_WOW_PATTERN);
        val = AR_WOW_STATUS(rval);

        /*
         * Mask only the WoW events that we have enabled. Sometimes
         * we have spurious WoW events from the AR_WOW_PATTERN
         * register. This mask will clean it up.
         */
        val &= ah->wow.wow_event_mask;

        if (val) {
                if (val & AR_WOW_MAGIC_PAT_FOUND)
                        wow_status |= AH_WOW_MAGIC_PATTERN_EN;
                if (AR_WOW_PATTERN_FOUND(val))
                        wow_status |= AH_WOW_USER_PATTERN_EN;
                if (val & AR_WOW_KEEP_ALIVE_FAIL)
                        wow_status |= AH_WOW_LINK_CHANGE;
                if (val & AR_WOW_BEACON_FAIL)
                        wow_status |= AH_WOW_BEACON_MISS;
        }

        rval = REG_READ(ah, AR_MAC_PCU_WOW4);
        val = AR_WOW_STATUS2(rval);
        val &= ah->wow.wow_event_mask2;

        if (val) {
                if (AR_WOW2_PATTERN_FOUND(val))
                        wow_status |= AH_WOW_USER_PATTERN_EN;
        }

        /*
         * set and clear WOW_PME_CLEAR registers for the chip to
         * generate next wow signal.
         * disable D3 before accessing other registers ?
         */

        /* do we need to check the bit value 0x01000000 (7-10) ?? */
        REG_RMW(ah, AR_PCIE_PM_CTRL, AR_PMCTRL_WOW_PME_CLR,
                AR_PMCTRL_PWR_STATE_D1D3);

        /*
         * Clear all events.
         */
        REG_WRITE(ah, AR_WOW_PATTERN,
                  AR_WOW_CLEAR_EVENTS(REG_READ(ah, AR_WOW_PATTERN)));
        REG_WRITE(ah, AR_MAC_PCU_WOW4,
                  AR_WOW_CLEAR_EVENTS2(REG_READ(ah, AR_MAC_PCU_WOW4)));

        /*
         * restore the beacon threshold to init value
         */
        REG_WRITE(ah, AR_RSSI_THR, INIT_RSSI_THR);

        /*
         * Restore the way the PCI-E reset, Power-On-Reset, external
         * PCIE_POR_SHORT pins are tied to its original value.
         * Previously just before WoW sleep, we untie the PCI-E
         * reset to our Chip's Power On Reset so that any PCI-E
         * reset from the bus will not reset our chip
         */
        if (ah->is_pciexpress)
                ath9k_hw_configpcipowersave(ah, false);

        if (AR_SREV_9462(ah) || AR_SREV_9565(ah) || AR_SREV_9485(ah)) {
                u32 dc = REG_READ(ah, AR_DIRECT_CONNECT);

                if (!(dc & AR_DC_TSF2_ENABLE))
                        ath9k_hw_gen_timer_start_tsf2(ah);
        }

        ah->wow.wow_event_mask = 0;
        ah->wow.wow_event_mask2 = 0;

        return wow_status;
}
EXPORT_SYMBOL(ath9k_hw_wow_wakeup);

static void ath9k_hw_wow_set_arwr_reg(struct ath_hw *ah)
{
        u32 wa_reg;

        if (!ah->is_pciexpress)
                return;

        /*
         * We need to untie the internal POR (power-on-reset)
         * to the external PCI-E reset. We also need to tie
         * the PCI-E Phy reset to the PCI-E reset.
         */
        wa_reg = REG_READ(ah, AR_WA);
        wa_reg &= ~AR_WA_UNTIE_RESET_EN;
        wa_reg |= AR_WA_RESET_EN;
        wa_reg |= AR_WA_POR_SHORT;

        REG_WRITE(ah, AR_WA, wa_reg);
}

void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable)
{
        u32 wow_event_mask;
        u32 keep_alive, magic_pattern, host_pm_ctrl;

        wow_event_mask = ah->wow.wow_event_mask;

        /*
         * AR_PMCTRL_HOST_PME_EN - Override PME enable in configuration
         *                         space and allow MAC to generate WoW anyway.
         *
         * AR_PMCTRL_PWR_PM_CTRL_ENA - ???
         *
         * AR_PMCTRL_AUX_PWR_DET - PCI core SYS_AUX_PWR_DET signal,
         *                         needs to be set for WoW in PCI mode.
         *
         * AR_PMCTRL_WOW_PME_CLR - WoW Clear Signal going to the MAC.
         *
         * Set the power states appropriately and enable PME.
         *
         * Set and clear WOW_PME_CLEAR for the chip
         * to generate next wow signal.
         */
        REG_SET_BIT(ah, AR_PCIE_PM_CTRL, AR_PMCTRL_HOST_PME_EN |
                                         AR_PMCTRL_PWR_PM_CTRL_ENA |
                                         AR_PMCTRL_AUX_PWR_DET |
                                         AR_PMCTRL_WOW_PME_CLR);
        REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, AR_PMCTRL_WOW_PME_CLR);

        /*
         * Random Backoff.
         *
         * 31:28 in AR_WOW_PATTERN : Indicates the number of bits used in the
         *                           contention window. For value N,
         *                           the random backoff will be selected between
         *                           0 and (2 ^ N) - 1.
         */
        REG_SET_BIT(ah, AR_WOW_PATTERN,
                    AR_WOW_BACK_OFF_SHIFT(AR_WOW_PAT_BACKOFF));

        /*
         * AIFS time, Slot time, Keep Alive count.
         */
        REG_SET_BIT(ah, AR_WOW_COUNT, AR_WOW_AIFS_CNT(AR_WOW_CNT_AIFS_CNT) |
                                      AR_WOW_SLOT_CNT(AR_WOW_CNT_SLOT_CNT) |
                                      AR_WOW_KEEP_ALIVE_CNT(AR_WOW_CNT_KA_CNT));
        /*
         * Beacon timeout.
         */
        if (pattern_enable & AH_WOW_BEACON_MISS)
                REG_WRITE(ah, AR_WOW_BCN_TIMO, AR_WOW_BEACON_TIMO);
        else
                REG_WRITE(ah, AR_WOW_BCN_TIMO, AR_WOW_BEACON_TIMO_MAX);

        /*
         * Keep alive timeout in ms.
         */
        if (!pattern_enable)
                REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, AR_WOW_KEEP_ALIVE_NEVER);
        else
                REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, KAL_TIMEOUT * 32);

        /*
         * Keep alive delay in us.
         */
        REG_WRITE(ah, AR_WOW_KEEP_ALIVE_DELAY, KAL_DELAY * 1000);

        /*
         * Create keep alive pattern to respond to beacons.
         */
        ath9k_wow_create_keep_alive_pattern(ah);

        /*
         * Configure keep alive register.
         */
        keep_alive = REG_READ(ah, AR_WOW_KEEP_ALIVE);

        /* Send keep alive timeouts anyway */
        keep_alive &= ~AR_WOW_KEEP_ALIVE_AUTO_DIS;

        if (pattern_enable & AH_WOW_LINK_CHANGE) {
                keep_alive &= ~AR_WOW_KEEP_ALIVE_FAIL_DIS;
                wow_event_mask |= AR_WOW_KEEP_ALIVE_FAIL;
        } else {
                keep_alive |= AR_WOW_KEEP_ALIVE_FAIL_DIS;
        }

        REG_WRITE(ah, AR_WOW_KEEP_ALIVE, keep_alive);

        /*
         * We are relying on a bmiss failure, ensure we have
         * enough threshold to prevent false positives.
         */
        REG_RMW_FIELD(ah, AR_RSSI_THR, AR_RSSI_THR_BM_THR,
                      AR_WOW_BMISSTHRESHOLD);

        if (pattern_enable & AH_WOW_BEACON_MISS) {
                wow_event_mask |= AR_WOW_BEACON_FAIL;
                REG_SET_BIT(ah, AR_WOW_BCN_EN, AR_WOW_BEACON_FAIL_EN);
        } else {
                REG_CLR_BIT(ah, AR_WOW_BCN_EN, AR_WOW_BEACON_FAIL_EN);
        }

        /*
         * Enable the magic packet registers.
         */
        magic_pattern = REG_READ(ah, AR_WOW_PATTERN);
        magic_pattern |= AR_WOW_MAC_INTR_EN;

        if (pattern_enable & AH_WOW_MAGIC_PATTERN_EN) {
                magic_pattern |= AR_WOW_MAGIC_EN;
                wow_event_mask |= AR_WOW_MAGIC_PAT_FOUND;
        } else {
                magic_pattern &= ~AR_WOW_MAGIC_EN;
        }

        REG_WRITE(ah, AR_WOW_PATTERN, magic_pattern);

        /*
         * Enable pattern matching for packets which are less
         * than 256 bytes.
         */
        REG_WRITE(ah, AR_WOW_PATTERN_MATCH_LT_256B,
                  AR_WOW_PATTERN_SUPPORTED);

        /*
         * Set the power states appropriately and enable PME.
         */
        host_pm_ctrl = REG_READ(ah, AR_PCIE_PM_CTRL);
        host_pm_ctrl |= AR_PMCTRL_PWR_STATE_D1D3 |
                        AR_PMCTRL_HOST_PME_EN |
                        AR_PMCTRL_PWR_PM_CTRL_ENA;
        host_pm_ctrl &= ~AR_PCIE_PM_CTRL_ENA;

        if (AR_SREV_9462(ah)) {
                /*
                 * This is needed to prevent the chip waking up
                 * the host within 3-4 seconds with certain
                 * platform/BIOS.
                 */
                host_pm_ctrl &= ~AR_PMCTRL_PWR_STATE_D1D3;
                host_pm_ctrl |= AR_PMCTRL_PWR_STATE_D1D3_REAL;
        }

        REG_WRITE(ah, AR_PCIE_PM_CTRL, host_pm_ctrl);

        /*
         * Enable sequence number generation when asleep.
         */
        REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PRESERVE_SEQNUM);

        /* To bring down WOW power low margin */
        REG_SET_BIT(ah, AR_PCIE_PHY_REG3, BIT(13));

        ath9k_hw_wow_set_arwr_reg(ah);

        if (ath9k_hw_mci_is_enabled(ah))
                REG_WRITE(ah, AR_RTC_KEEP_AWAKE, 0x2);

        /* HW WoW */
        REG_CLR_BIT(ah, AR_PCU_MISC_MODE3, BIT(5));

        ath9k_hw_set_powermode_wow_sleep(ah);
        ah->wow.wow_event_mask = wow_event_mask;
}
EXPORT_SYMBOL(ath9k_hw_wow_enable);