diff options
Diffstat (limited to 'drivers/net/wireless/ath/ath5k/base.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath5k/base.c | 3248 |
1 files changed, 3248 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c new file mode 100644 index 000000000..c59c14483 --- /dev/null +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -0,0 +1,3248 @@ +/*- + * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting + * Copyright (c) 2004-2005 Atheros Communications, Inc. + * Copyright (c) 2006 Devicescape Software, Inc. + * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com> + * Copyright (c) 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu> + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any + * redistribution must be conditioned upon including a substantially + * similar Disclaimer requirement for further binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY + * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, + * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER + * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGES. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/hardirq.h> +#include <linux/if.h> +#include <linux/io.h> +#include <linux/netdevice.h> +#include <linux/cache.h> +#include <linux/ethtool.h> +#include <linux/uaccess.h> +#include <linux/slab.h> +#include <linux/etherdevice.h> +#include <linux/nl80211.h> + +#include <net/cfg80211.h> +#include <net/ieee80211_radiotap.h> + +#include <asm/unaligned.h> + +#include <net/mac80211.h> +#include "base.h" +#include "reg.h" +#include "debug.h" +#include "ani.h" +#include "ath5k.h" +#include "../regd.h" + +#define CREATE_TRACE_POINTS +#include "trace.h" + +bool ath5k_modparam_nohwcrypt; +module_param_named(nohwcrypt, ath5k_modparam_nohwcrypt, bool, 0444); +MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption."); + +static bool modparam_fastchanswitch; +module_param_named(fastchanswitch, modparam_fastchanswitch, bool, 0444); +MODULE_PARM_DESC(fastchanswitch, "Enable fast channel switching for AR2413/AR5413 radios."); + +static bool ath5k_modparam_no_hw_rfkill_switch; +module_param_named(no_hw_rfkill_switch, ath5k_modparam_no_hw_rfkill_switch, + bool, 0444); +MODULE_PARM_DESC(no_hw_rfkill_switch, "Ignore the GPIO RFKill switch state"); + + +/* Module info */ +MODULE_AUTHOR("Jiri Slaby"); +MODULE_AUTHOR("Nick Kossifidis"); +MODULE_DESCRIPTION("Support for 5xxx series of Atheros 802.11 wireless LAN cards."); +MODULE_LICENSE("Dual BSD/GPL"); + +static int ath5k_init(struct ieee80211_hw *hw); +static int ath5k_reset(struct ath5k_hw *ah, struct ieee80211_channel *chan, + bool skip_pcu); + +/* Known SREVs */ +static const struct ath5k_srev_name srev_names[] = { +#ifdef CONFIG_ATH5K_AHB + { "5312", AR5K_VERSION_MAC, AR5K_SREV_AR5312_R2 }, + { "5312", AR5K_VERSION_MAC, AR5K_SREV_AR5312_R7 }, + { "2313", AR5K_VERSION_MAC, AR5K_SREV_AR2313_R8 }, + { "2315", AR5K_VERSION_MAC, AR5K_SREV_AR2315_R6 }, + { "2315", AR5K_VERSION_MAC, AR5K_SREV_AR2315_R7 }, + { "2317", AR5K_VERSION_MAC, AR5K_SREV_AR2317_R1 }, + { "2317", AR5K_VERSION_MAC, AR5K_SREV_AR2317_R2 }, +#else + { "5210", AR5K_VERSION_MAC, AR5K_SREV_AR5210 }, + { "5311", AR5K_VERSION_MAC, AR5K_SREV_AR5311 }, + { "5311A", AR5K_VERSION_MAC, AR5K_SREV_AR5311A }, + { "5311B", AR5K_VERSION_MAC, AR5K_SREV_AR5311B }, + { "5211", AR5K_VERSION_MAC, AR5K_SREV_AR5211 }, + { "5212", AR5K_VERSION_MAC, AR5K_SREV_AR5212 }, + { "5213", AR5K_VERSION_MAC, AR5K_SREV_AR5213 }, + { "5213A", AR5K_VERSION_MAC, AR5K_SREV_AR5213A }, + { "2413", AR5K_VERSION_MAC, AR5K_SREV_AR2413 }, + { "2414", AR5K_VERSION_MAC, AR5K_SREV_AR2414 }, + { "5424", AR5K_VERSION_MAC, AR5K_SREV_AR5424 }, + { "5413", AR5K_VERSION_MAC, AR5K_SREV_AR5413 }, + { "5414", AR5K_VERSION_MAC, AR5K_SREV_AR5414 }, + { "2415", AR5K_VERSION_MAC, AR5K_SREV_AR2415 }, + { "5416", AR5K_VERSION_MAC, AR5K_SREV_AR5416 }, + { "5418", AR5K_VERSION_MAC, AR5K_SREV_AR5418 }, + { "2425", AR5K_VERSION_MAC, AR5K_SREV_AR2425 }, + { "2417", AR5K_VERSION_MAC, AR5K_SREV_AR2417 }, +#endif + { "xxxxx", AR5K_VERSION_MAC, AR5K_SREV_UNKNOWN }, + { "5110", AR5K_VERSION_RAD, AR5K_SREV_RAD_5110 }, + { "5111", AR5K_VERSION_RAD, AR5K_SREV_RAD_5111 }, + { "5111A", AR5K_VERSION_RAD, AR5K_SREV_RAD_5111A }, + { "2111", AR5K_VERSION_RAD, AR5K_SREV_RAD_2111 }, + { "5112", AR5K_VERSION_RAD, AR5K_SREV_RAD_5112 }, + { "5112A", AR5K_VERSION_RAD, AR5K_SREV_RAD_5112A }, + { "5112B", AR5K_VERSION_RAD, AR5K_SREV_RAD_5112B }, + { "2112", AR5K_VERSION_RAD, AR5K_SREV_RAD_2112 }, + { "2112A", AR5K_VERSION_RAD, AR5K_SREV_RAD_2112A }, + { "2112B", AR5K_VERSION_RAD, AR5K_SREV_RAD_2112B }, + { "2413", AR5K_VERSION_RAD, AR5K_SREV_RAD_2413 }, + { "5413", AR5K_VERSION_RAD, AR5K_SREV_RAD_5413 }, + { "5424", AR5K_VERSION_RAD, AR5K_SREV_RAD_5424 }, + { "5133", AR5K_VERSION_RAD, AR5K_SREV_RAD_5133 }, +#ifdef CONFIG_ATH5K_AHB + { "2316", AR5K_VERSION_RAD, AR5K_SREV_RAD_2316 }, + { "2317", AR5K_VERSION_RAD, AR5K_SREV_RAD_2317 }, +#endif + { "xxxxx", AR5K_VERSION_RAD, AR5K_SREV_UNKNOWN }, +}; + +static const struct ieee80211_rate ath5k_rates[] = { + { .bitrate = 10, + .hw_value = ATH5K_RATE_CODE_1M, }, + { .bitrate = 20, + .hw_value = ATH5K_RATE_CODE_2M, + .hw_value_short = ATH5K_RATE_CODE_2M | AR5K_SET_SHORT_PREAMBLE, + .flags = IEEE80211_RATE_SHORT_PREAMBLE }, + { .bitrate = 55, + .hw_value = ATH5K_RATE_CODE_5_5M, + .hw_value_short = ATH5K_RATE_CODE_5_5M | AR5K_SET_SHORT_PREAMBLE, + .flags = IEEE80211_RATE_SHORT_PREAMBLE }, + { .bitrate = 110, + .hw_value = ATH5K_RATE_CODE_11M, + .hw_value_short = ATH5K_RATE_CODE_11M | AR5K_SET_SHORT_PREAMBLE, + .flags = IEEE80211_RATE_SHORT_PREAMBLE }, + { .bitrate = 60, + .hw_value = ATH5K_RATE_CODE_6M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, + { .bitrate = 90, + .hw_value = ATH5K_RATE_CODE_9M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, + { .bitrate = 120, + .hw_value = ATH5K_RATE_CODE_12M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, + { .bitrate = 180, + .hw_value = ATH5K_RATE_CODE_18M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, + { .bitrate = 240, + .hw_value = ATH5K_RATE_CODE_24M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, + { .bitrate = 360, + .hw_value = ATH5K_RATE_CODE_36M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, + { .bitrate = 480, + .hw_value = ATH5K_RATE_CODE_48M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, + { .bitrate = 540, + .hw_value = ATH5K_RATE_CODE_54M, + .flags = IEEE80211_RATE_SUPPORTS_5MHZ | + IEEE80211_RATE_SUPPORTS_10MHZ }, +}; + +static inline u64 ath5k_extend_tsf(struct ath5k_hw *ah, u32 rstamp) +{ + u64 tsf = ath5k_hw_get_tsf64(ah); + + if ((tsf & 0x7fff) < rstamp) + tsf -= 0x8000; + + return (tsf & ~0x7fff) | rstamp; +} + +const char * +ath5k_chip_name(enum ath5k_srev_type type, u_int16_t val) +{ + const char *name = "xxxxx"; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(srev_names); i++) { + if (srev_names[i].sr_type != type) + continue; + + if ((val & 0xf0) == srev_names[i].sr_val) + name = srev_names[i].sr_name; + + if ((val & 0xff) == srev_names[i].sr_val) { + name = srev_names[i].sr_name; + break; + } + } + + return name; +} +static unsigned int ath5k_ioread32(void *hw_priv, u32 reg_offset) +{ + struct ath5k_hw *ah = (struct ath5k_hw *) hw_priv; + return ath5k_hw_reg_read(ah, reg_offset); +} + +static void ath5k_iowrite32(void *hw_priv, u32 val, u32 reg_offset) +{ + struct ath5k_hw *ah = (struct ath5k_hw *) hw_priv; + ath5k_hw_reg_write(ah, val, reg_offset); +} + +static const struct ath_ops ath5k_common_ops = { + .read = ath5k_ioread32, + .write = ath5k_iowrite32, +}; + +/***********************\ +* Driver Initialization * +\***********************/ + +static void ath5k_reg_notifier(struct wiphy *wiphy, + struct regulatory_request *request) +{ + struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy); + struct ath5k_hw *ah = hw->priv; + struct ath_regulatory *regulatory = ath5k_hw_regulatory(ah); + + ath_reg_notifier_apply(wiphy, request, regulatory); +} + +/********************\ +* Channel/mode setup * +\********************/ + +/* + * Returns true for the channel numbers used. + */ +#ifdef CONFIG_ATH5K_TEST_CHANNELS +static bool ath5k_is_standard_channel(short chan, enum nl80211_band band) +{ + return true; +} + +#else +static bool ath5k_is_standard_channel(short chan, enum nl80211_band band) +{ + if (band == NL80211_BAND_2GHZ && chan <= 14) + return true; + + return /* UNII 1,2 */ + (((chan & 3) == 0 && chan >= 36 && chan <= 64) || + /* midband */ + ((chan & 3) == 0 && chan >= 100 && chan <= 140) || + /* UNII-3 */ + ((chan & 3) == 1 && chan >= 149 && chan <= 165) || + /* 802.11j 5.030-5.080 GHz (20MHz) */ + (chan == 8 || chan == 12 || chan == 16) || + /* 802.11j 4.9GHz (20MHz) */ + (chan == 184 || chan == 188 || chan == 192 || chan == 196)); +} +#endif + +static unsigned int +ath5k_setup_channels(struct ath5k_hw *ah, struct ieee80211_channel *channels, + unsigned int mode, unsigned int max) +{ + unsigned int count, size, freq, ch; + enum nl80211_band band; + + switch (mode) { + case AR5K_MODE_11A: + /* 1..220, but 2GHz frequencies are filtered by check_channel */ + size = 220; + band = NL80211_BAND_5GHZ; + break; + case AR5K_MODE_11B: + case AR5K_MODE_11G: + size = 26; + band = NL80211_BAND_2GHZ; + break; + default: + ATH5K_WARN(ah, "bad mode, not copying channels\n"); + return 0; + } + + count = 0; + for (ch = 1; ch <= size && count < max; ch++) { + freq = ieee80211_channel_to_frequency(ch, band); + + if (freq == 0) /* mapping failed - not a standard channel */ + continue; + + /* Write channel info, needed for ath5k_channel_ok() */ + channels[count].center_freq = freq; + channels[count].band = band; + channels[count].hw_value = mode; + + /* Check if channel is supported by the chipset */ + if (!ath5k_channel_ok(ah, &channels[count])) + continue; + + if (!ath5k_is_standard_channel(ch, band)) + continue; + + count++; + } + + return count; +} + +static void +ath5k_setup_rate_idx(struct ath5k_hw *ah, struct ieee80211_supported_band *b) +{ + u8 i; + + for (i = 0; i < AR5K_MAX_RATES; i++) + ah->rate_idx[b->band][i] = -1; + + for (i = 0; i < b->n_bitrates; i++) { + ah->rate_idx[b->band][b->bitrates[i].hw_value] = i; + if (b->bitrates[i].hw_value_short) + ah->rate_idx[b->band][b->bitrates[i].hw_value_short] = i; + } +} + +static int +ath5k_setup_bands(struct ieee80211_hw *hw) +{ + struct ath5k_hw *ah = hw->priv; + struct ieee80211_supported_band *sband; + int max_c, count_c = 0; + int i; + + BUILD_BUG_ON(ARRAY_SIZE(ah->sbands) < NUM_NL80211_BANDS); + max_c = ARRAY_SIZE(ah->channels); + + /* 2GHz band */ + sband = &ah->sbands[NL80211_BAND_2GHZ]; + sband->band = NL80211_BAND_2GHZ; + sband->bitrates = &ah->rates[NL80211_BAND_2GHZ][0]; + + if (test_bit(AR5K_MODE_11G, ah->ah_capabilities.cap_mode)) { + /* G mode */ + memcpy(sband->bitrates, &ath5k_rates[0], + sizeof(struct ieee80211_rate) * 12); + sband->n_bitrates = 12; + + sband->channels = ah->channels; + sband->n_channels = ath5k_setup_channels(ah, sband->channels, + AR5K_MODE_11G, max_c); + + hw->wiphy->bands[NL80211_BAND_2GHZ] = sband; + count_c = sband->n_channels; + max_c -= count_c; + } else if (test_bit(AR5K_MODE_11B, ah->ah_capabilities.cap_mode)) { + /* B mode */ + memcpy(sband->bitrates, &ath5k_rates[0], + sizeof(struct ieee80211_rate) * 4); + sband->n_bitrates = 4; + + /* 5211 only supports B rates and uses 4bit rate codes + * (e.g normally we have 0x1B for 1M, but on 5211 we have 0x0B) + * fix them up here: + */ + if (ah->ah_version == AR5K_AR5211) { + for (i = 0; i < 4; i++) { + sband->bitrates[i].hw_value = + sband->bitrates[i].hw_value & 0xF; + sband->bitrates[i].hw_value_short = + sband->bitrates[i].hw_value_short & 0xF; + } + } + + sband->channels = ah->channels; + sband->n_channels = ath5k_setup_channels(ah, sband->channels, + AR5K_MODE_11B, max_c); + + hw->wiphy->bands[NL80211_BAND_2GHZ] = sband; + count_c = sband->n_channels; + max_c -= count_c; + } + ath5k_setup_rate_idx(ah, sband); + + /* 5GHz band, A mode */ + if (test_bit(AR5K_MODE_11A, ah->ah_capabilities.cap_mode)) { + sband = &ah->sbands[NL80211_BAND_5GHZ]; + sband->band = NL80211_BAND_5GHZ; + sband->bitrates = &ah->rates[NL80211_BAND_5GHZ][0]; + + memcpy(sband->bitrates, &ath5k_rates[4], + sizeof(struct ieee80211_rate) * 8); + sband->n_bitrates = 8; + + sband->channels = &ah->channels[count_c]; + sband->n_channels = ath5k_setup_channels(ah, sband->channels, + AR5K_MODE_11A, max_c); + + hw->wiphy->bands[NL80211_BAND_5GHZ] = sband; + } + ath5k_setup_rate_idx(ah, sband); + + ath5k_debug_dump_bands(ah); + + return 0; +} + +/* + * Set/change channels. We always reset the chip. + * To accomplish this we must first cleanup any pending DMA, + * then restart stuff after a la ath5k_init. + * + * Called with ah->lock. + */ +int +ath5k_chan_set(struct ath5k_hw *ah, struct cfg80211_chan_def *chandef) +{ + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "channel set, resetting (%u -> %u MHz)\n", + ah->curchan->center_freq, chandef->chan->center_freq); + + switch (chandef->width) { + case NL80211_CHAN_WIDTH_20: + case NL80211_CHAN_WIDTH_20_NOHT: + ah->ah_bwmode = AR5K_BWMODE_DEFAULT; + break; + case NL80211_CHAN_WIDTH_5: + ah->ah_bwmode = AR5K_BWMODE_5MHZ; + break; + case NL80211_CHAN_WIDTH_10: + ah->ah_bwmode = AR5K_BWMODE_10MHZ; + break; + default: + WARN_ON(1); + return -EINVAL; + } + + /* + * To switch channels clear any pending DMA operations; + * wait long enough for the RX fifo to drain, reset the + * hardware at the new frequency, and then re-enable + * the relevant bits of the h/w. + */ + return ath5k_reset(ah, chandef->chan, true); +} + +void ath5k_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif) +{ + struct ath5k_vif_iter_data *iter_data = data; + int i; + struct ath5k_vif *avf = (void *)vif->drv_priv; + + if (iter_data->hw_macaddr) + for (i = 0; i < ETH_ALEN; i++) + iter_data->mask[i] &= + ~(iter_data->hw_macaddr[i] ^ mac[i]); + + if (!iter_data->found_active) { + iter_data->found_active = true; + memcpy(iter_data->active_mac, mac, ETH_ALEN); + } + + if (iter_data->need_set_hw_addr && iter_data->hw_macaddr) + if (ether_addr_equal(iter_data->hw_macaddr, mac)) + iter_data->need_set_hw_addr = false; + + if (!iter_data->any_assoc) { + if (avf->assoc) + iter_data->any_assoc = true; + } + + /* Calculate combined mode - when APs are active, operate in AP mode. + * Otherwise use the mode of the new interface. This can currently + * only deal with combinations of APs and STAs. Only one ad-hoc + * interfaces is allowed. + */ + if (avf->opmode == NL80211_IFTYPE_AP) + iter_data->opmode = NL80211_IFTYPE_AP; + else { + if (avf->opmode == NL80211_IFTYPE_STATION) + iter_data->n_stas++; + if (iter_data->opmode == NL80211_IFTYPE_UNSPECIFIED) + iter_data->opmode = avf->opmode; + } +} + +void +ath5k_update_bssid_mask_and_opmode(struct ath5k_hw *ah, + struct ieee80211_vif *vif) +{ + struct ath_common *common = ath5k_hw_common(ah); + struct ath5k_vif_iter_data iter_data; + u32 rfilt; + + /* + * Use the hardware MAC address as reference, the hardware uses it + * together with the BSSID mask when matching addresses. + */ + iter_data.hw_macaddr = common->macaddr; + eth_broadcast_addr(iter_data.mask); + iter_data.found_active = false; + iter_data.need_set_hw_addr = true; + iter_data.opmode = NL80211_IFTYPE_UNSPECIFIED; + iter_data.n_stas = 0; + + if (vif) + ath5k_vif_iter(&iter_data, vif->addr, vif); + + /* Get list of all active MAC addresses */ + ieee80211_iterate_active_interfaces_atomic( + ah->hw, IEEE80211_IFACE_ITER_RESUME_ALL, + ath5k_vif_iter, &iter_data); + memcpy(ah->bssidmask, iter_data.mask, ETH_ALEN); + + ah->opmode = iter_data.opmode; + if (ah->opmode == NL80211_IFTYPE_UNSPECIFIED) + /* Nothing active, default to station mode */ + ah->opmode = NL80211_IFTYPE_STATION; + + ath5k_hw_set_opmode(ah, ah->opmode); + ATH5K_DBG(ah, ATH5K_DEBUG_MODE, "mode setup opmode %d (%s)\n", + ah->opmode, ath_opmode_to_string(ah->opmode)); + + if (iter_data.need_set_hw_addr && iter_data.found_active) + ath5k_hw_set_lladdr(ah, iter_data.active_mac); + + if (ath5k_hw_hasbssidmask(ah)) + ath5k_hw_set_bssid_mask(ah, ah->bssidmask); + + /* Set up RX Filter */ + if (iter_data.n_stas > 1) { + /* If you have multiple STA interfaces connected to + * different APs, ARPs are not received (most of the time?) + * Enabling PROMISC appears to fix that problem. + */ + ah->filter_flags |= AR5K_RX_FILTER_PROM; + } + + rfilt = ah->filter_flags; + ath5k_hw_set_rx_filter(ah, rfilt); + ATH5K_DBG(ah, ATH5K_DEBUG_MODE, "RX filter 0x%x\n", rfilt); +} + +static inline int +ath5k_hw_to_driver_rix(struct ath5k_hw *ah, int hw_rix) +{ + int rix; + + /* return base rate on errors */ + if (WARN(hw_rix < 0 || hw_rix >= AR5K_MAX_RATES, + "hw_rix out of bounds: %x\n", hw_rix)) + return 0; + + rix = ah->rate_idx[ah->curchan->band][hw_rix]; + if (WARN(rix < 0, "invalid hw_rix: %x\n", hw_rix)) + rix = 0; + + return rix; +} + +/***************\ +* Buffers setup * +\***************/ + +static +struct sk_buff *ath5k_rx_skb_alloc(struct ath5k_hw *ah, dma_addr_t *skb_addr) +{ + struct ath_common *common = ath5k_hw_common(ah); + struct sk_buff *skb; + + /* + * Allocate buffer with headroom_needed space for the + * fake physical layer header at the start. + */ + skb = ath_rxbuf_alloc(common, + common->rx_bufsize, + GFP_ATOMIC); + + if (!skb) { + ATH5K_ERR(ah, "can't alloc skbuff of size %u\n", + common->rx_bufsize); + return NULL; + } + + *skb_addr = dma_map_single(ah->dev, + skb->data, common->rx_bufsize, + DMA_FROM_DEVICE); + + if (unlikely(dma_mapping_error(ah->dev, *skb_addr))) { + ATH5K_ERR(ah, "%s: DMA mapping failed\n", __func__); + dev_kfree_skb(skb); + return NULL; + } + return skb; +} + +static int +ath5k_rxbuf_setup(struct ath5k_hw *ah, struct ath5k_buf *bf) +{ + struct sk_buff *skb = bf->skb; + struct ath5k_desc *ds; + int ret; + + if (!skb) { + skb = ath5k_rx_skb_alloc(ah, &bf->skbaddr); + if (!skb) + return -ENOMEM; + bf->skb = skb; + } + + /* + * Setup descriptors. For receive we always terminate + * the descriptor list with a self-linked entry so we'll + * not get overrun under high load (as can happen with a + * 5212 when ANI processing enables PHY error frames). + * + * To ensure the last descriptor is self-linked we create + * each descriptor as self-linked and add it to the end. As + * each additional descriptor is added the previous self-linked + * entry is "fixed" naturally. This should be safe even + * if DMA is happening. When processing RX interrupts we + * never remove/process the last, self-linked, entry on the + * descriptor list. This ensures the hardware always has + * someplace to write a new frame. + */ + ds = bf->desc; + ds->ds_link = bf->daddr; /* link to self */ + ds->ds_data = bf->skbaddr; + ret = ath5k_hw_setup_rx_desc(ah, ds, ah->common.rx_bufsize, 0); + if (ret) { + ATH5K_ERR(ah, "%s: could not setup RX desc\n", __func__); + return ret; + } + + if (ah->rxlink != NULL) + *ah->rxlink = bf->daddr; + ah->rxlink = &ds->ds_link; + return 0; +} + +static enum ath5k_pkt_type get_hw_packet_type(struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr; + enum ath5k_pkt_type htype; + __le16 fc; + + hdr = (struct ieee80211_hdr *)skb->data; + fc = hdr->frame_control; + + if (ieee80211_is_beacon(fc)) + htype = AR5K_PKT_TYPE_BEACON; + else if (ieee80211_is_probe_resp(fc)) + htype = AR5K_PKT_TYPE_PROBE_RESP; + else if (ieee80211_is_atim(fc)) + htype = AR5K_PKT_TYPE_ATIM; + else if (ieee80211_is_pspoll(fc)) + htype = AR5K_PKT_TYPE_PSPOLL; + else + htype = AR5K_PKT_TYPE_NORMAL; + + return htype; +} + +static struct ieee80211_rate * +ath5k_get_rate(const struct ieee80211_hw *hw, + const struct ieee80211_tx_info *info, + struct ath5k_buf *bf, int idx) +{ + /* + * convert a ieee80211_tx_rate RC-table entry to + * the respective ieee80211_rate struct + */ + if (bf->rates[idx].idx < 0) { + return NULL; + } + + return &hw->wiphy->bands[info->band]->bitrates[ bf->rates[idx].idx ]; +} + +static u16 +ath5k_get_rate_hw_value(const struct ieee80211_hw *hw, + const struct ieee80211_tx_info *info, + struct ath5k_buf *bf, int idx) +{ + struct ieee80211_rate *rate; + u16 hw_rate; + u8 rc_flags; + + rate = ath5k_get_rate(hw, info, bf, idx); + if (!rate) + return 0; + + rc_flags = bf->rates[idx].flags; + hw_rate = (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) ? + rate->hw_value_short : rate->hw_value; + + return hw_rate; +} + +static bool ath5k_merge_ratetbl(struct ieee80211_sta *sta, + struct ath5k_buf *bf, + struct ieee80211_tx_info *tx_info) +{ + struct ieee80211_sta_rates *ratetbl; + u8 i; + + if (!sta) + return false; + + ratetbl = rcu_dereference(sta->rates); + if (!ratetbl) + return false; + + if (tx_info->control.rates[0].idx < 0 || + tx_info->control.rates[0].count == 0) + { + i = 0; + } else { + bf->rates[0] = tx_info->control.rates[0]; + i = 1; + } + + for ( ; i < IEEE80211_TX_MAX_RATES; i++) { + bf->rates[i].idx = ratetbl->rate[i].idx; + bf->rates[i].flags = ratetbl->rate[i].flags; + if (tx_info->control.use_rts) + bf->rates[i].count = ratetbl->rate[i].count_rts; + else if (tx_info->control.use_cts_prot) + bf->rates[i].count = ratetbl->rate[i].count_cts; + else + bf->rates[i].count = ratetbl->rate[i].count; + } + + return true; +} + +static int +ath5k_txbuf_setup(struct ath5k_hw *ah, struct ath5k_buf *bf, + struct ath5k_txq *txq, int padsize, + struct ieee80211_tx_control *control) +{ + struct ath5k_desc *ds = bf->desc; + struct sk_buff *skb = bf->skb; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + unsigned int pktlen, flags, keyidx = AR5K_TXKEYIX_INVALID; + struct ieee80211_rate *rate; + struct ieee80211_sta *sta; + unsigned int mrr_rate[3], mrr_tries[3]; + int i, ret; + u16 hw_rate; + u16 cts_rate = 0; + u16 duration = 0; + u8 rc_flags; + + flags = AR5K_TXDESC_INTREQ | AR5K_TXDESC_CLRDMASK; + + /* XXX endianness */ + bf->skbaddr = dma_map_single(ah->dev, skb->data, skb->len, + DMA_TO_DEVICE); + + if (dma_mapping_error(ah->dev, bf->skbaddr)) + return -ENOSPC; + + if (control) + sta = control->sta; + else + sta = NULL; + + if (!ath5k_merge_ratetbl(sta, bf, info)) { + ieee80211_get_tx_rates(info->control.vif, + sta, skb, bf->rates, + ARRAY_SIZE(bf->rates)); + } + + rate = ath5k_get_rate(ah->hw, info, bf, 0); + + if (!rate) { + ret = -EINVAL; + goto err_unmap; + } + + if (info->flags & IEEE80211_TX_CTL_NO_ACK) + flags |= AR5K_TXDESC_NOACK; + + rc_flags = bf->rates[0].flags; + + hw_rate = ath5k_get_rate_hw_value(ah->hw, info, bf, 0); + + pktlen = skb->len; + + /* FIXME: If we are in g mode and rate is a CCK rate + * subtract ah->ah_txpower.txp_cck_ofdm_pwr_delta + * from tx power (value is in dB units already) */ + if (info->control.hw_key) { + keyidx = info->control.hw_key->hw_key_idx; + pktlen += info->control.hw_key->icv_len; + } + if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) { + flags |= AR5K_TXDESC_RTSENA; + cts_rate = ieee80211_get_rts_cts_rate(ah->hw, info)->hw_value; + duration = le16_to_cpu(ieee80211_rts_duration(ah->hw, + info->control.vif, pktlen, info)); + } + if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) { + flags |= AR5K_TXDESC_CTSENA; + cts_rate = ieee80211_get_rts_cts_rate(ah->hw, info)->hw_value; + duration = le16_to_cpu(ieee80211_ctstoself_duration(ah->hw, + info->control.vif, pktlen, info)); + } + + ret = ah->ah_setup_tx_desc(ah, ds, pktlen, + ieee80211_get_hdrlen_from_skb(skb), padsize, + get_hw_packet_type(skb), + (ah->ah_txpower.txp_requested * 2), + hw_rate, + bf->rates[0].count, keyidx, ah->ah_tx_ant, flags, + cts_rate, duration); + if (ret) + goto err_unmap; + + /* Set up MRR descriptor */ + if (ah->ah_capabilities.cap_has_mrr_support) { + memset(mrr_rate, 0, sizeof(mrr_rate)); + memset(mrr_tries, 0, sizeof(mrr_tries)); + + for (i = 0; i < 3; i++) { + + rate = ath5k_get_rate(ah->hw, info, bf, i); + if (!rate) + break; + + mrr_rate[i] = ath5k_get_rate_hw_value(ah->hw, info, bf, i); + mrr_tries[i] = bf->rates[i].count; + } + + ath5k_hw_setup_mrr_tx_desc(ah, ds, + mrr_rate[0], mrr_tries[0], + mrr_rate[1], mrr_tries[1], + mrr_rate[2], mrr_tries[2]); + } + + ds->ds_link = 0; + ds->ds_data = bf->skbaddr; + + spin_lock_bh(&txq->lock); + list_add_tail(&bf->list, &txq->q); + txq->txq_len++; + if (txq->link == NULL) /* is this first packet? */ + ath5k_hw_set_txdp(ah, txq->qnum, bf->daddr); + else /* no, so only link it */ + *txq->link = bf->daddr; + + txq->link = &ds->ds_link; + ath5k_hw_start_tx_dma(ah, txq->qnum); + spin_unlock_bh(&txq->lock); + + return 0; +err_unmap: + dma_unmap_single(ah->dev, bf->skbaddr, skb->len, DMA_TO_DEVICE); + return ret; +} + +/*******************\ +* Descriptors setup * +\*******************/ + +static int +ath5k_desc_alloc(struct ath5k_hw *ah) +{ + struct ath5k_desc *ds; + struct ath5k_buf *bf; + dma_addr_t da; + unsigned int i; + int ret; + + /* allocate descriptors */ + ah->desc_len = sizeof(struct ath5k_desc) * + (ATH_TXBUF + ATH_RXBUF + ATH_BCBUF + 1); + + ah->desc = dma_alloc_coherent(ah->dev, ah->desc_len, + &ah->desc_daddr, GFP_KERNEL); + if (ah->desc == NULL) { + ATH5K_ERR(ah, "can't allocate descriptors\n"); + ret = -ENOMEM; + goto err; + } + ds = ah->desc; + da = ah->desc_daddr; + ATH5K_DBG(ah, ATH5K_DEBUG_ANY, "DMA map: %p (%zu) -> %llx\n", + ds, ah->desc_len, (unsigned long long)ah->desc_daddr); + + bf = kcalloc(1 + ATH_TXBUF + ATH_RXBUF + ATH_BCBUF, + sizeof(struct ath5k_buf), GFP_KERNEL); + if (bf == NULL) { + ATH5K_ERR(ah, "can't allocate bufptr\n"); + ret = -ENOMEM; + goto err_free; + } + ah->bufptr = bf; + + INIT_LIST_HEAD(&ah->rxbuf); + for (i = 0; i < ATH_RXBUF; i++, bf++, ds++, da += sizeof(*ds)) { + bf->desc = ds; + bf->daddr = da; + list_add_tail(&bf->list, &ah->rxbuf); + } + + INIT_LIST_HEAD(&ah->txbuf); + ah->txbuf_len = ATH_TXBUF; + for (i = 0; i < ATH_TXBUF; i++, bf++, ds++, da += sizeof(*ds)) { + bf->desc = ds; + bf->daddr = da; + list_add_tail(&bf->list, &ah->txbuf); + } + + /* beacon buffers */ + INIT_LIST_HEAD(&ah->bcbuf); + for (i = 0; i < ATH_BCBUF; i++, bf++, ds++, da += sizeof(*ds)) { + bf->desc = ds; + bf->daddr = da; + list_add_tail(&bf->list, &ah->bcbuf); + } + + return 0; +err_free: + dma_free_coherent(ah->dev, ah->desc_len, ah->desc, ah->desc_daddr); +err: + ah->desc = NULL; + return ret; +} + +void +ath5k_txbuf_free_skb(struct ath5k_hw *ah, struct ath5k_buf *bf) +{ + BUG_ON(!bf); + if (!bf->skb) + return; + dma_unmap_single(ah->dev, bf->skbaddr, bf->skb->len, + DMA_TO_DEVICE); + ieee80211_free_txskb(ah->hw, bf->skb); + bf->skb = NULL; + bf->skbaddr = 0; + bf->desc->ds_data = 0; +} + +void +ath5k_rxbuf_free_skb(struct ath5k_hw *ah, struct ath5k_buf *bf) +{ + struct ath_common *common = ath5k_hw_common(ah); + + BUG_ON(!bf); + if (!bf->skb) + return; + dma_unmap_single(ah->dev, bf->skbaddr, common->rx_bufsize, + DMA_FROM_DEVICE); + dev_kfree_skb_any(bf->skb); + bf->skb = NULL; + bf->skbaddr = 0; + bf->desc->ds_data = 0; +} + +static void +ath5k_desc_free(struct ath5k_hw *ah) +{ + struct ath5k_buf *bf; + + list_for_each_entry(bf, &ah->txbuf, list) + ath5k_txbuf_free_skb(ah, bf); + list_for_each_entry(bf, &ah->rxbuf, list) + ath5k_rxbuf_free_skb(ah, bf); + list_for_each_entry(bf, &ah->bcbuf, list) + ath5k_txbuf_free_skb(ah, bf); + + /* Free memory associated with all descriptors */ + dma_free_coherent(ah->dev, ah->desc_len, ah->desc, ah->desc_daddr); + ah->desc = NULL; + ah->desc_daddr = 0; + + kfree(ah->bufptr); + ah->bufptr = NULL; +} + + +/**************\ +* Queues setup * +\**************/ + +static struct ath5k_txq * +ath5k_txq_setup(struct ath5k_hw *ah, + int qtype, int subtype) +{ + struct ath5k_txq *txq; + struct ath5k_txq_info qi = { + .tqi_subtype = subtype, + /* XXX: default values not correct for B and XR channels, + * but who cares? */ + .tqi_aifs = AR5K_TUNE_AIFS, + .tqi_cw_min = AR5K_TUNE_CWMIN, + .tqi_cw_max = AR5K_TUNE_CWMAX + }; + int qnum; + + /* + * Enable interrupts only for EOL and DESC conditions. + * We mark tx descriptors to receive a DESC interrupt + * when a tx queue gets deep; otherwise we wait for the + * EOL to reap descriptors. Note that this is done to + * reduce interrupt load and this only defers reaping + * descriptors, never transmitting frames. Aside from + * reducing interrupts this also permits more concurrency. + * The only potential downside is if the tx queue backs + * up in which case the top half of the kernel may backup + * due to a lack of tx descriptors. + */ + qi.tqi_flags = AR5K_TXQ_FLAG_TXEOLINT_ENABLE | + AR5K_TXQ_FLAG_TXDESCINT_ENABLE; + qnum = ath5k_hw_setup_tx_queue(ah, qtype, &qi); + if (qnum < 0) { + /* + * NB: don't print a message, this happens + * normally on parts with too few tx queues + */ + return ERR_PTR(qnum); + } + txq = &ah->txqs[qnum]; + if (!txq->setup) { + txq->qnum = qnum; + txq->link = NULL; + INIT_LIST_HEAD(&txq->q); + spin_lock_init(&txq->lock); + txq->setup = true; + txq->txq_len = 0; + txq->txq_max = ATH5K_TXQ_LEN_MAX; + txq->txq_poll_mark = false; + txq->txq_stuck = 0; + } + return &ah->txqs[qnum]; +} + +static int +ath5k_beaconq_setup(struct ath5k_hw *ah) +{ + struct ath5k_txq_info qi = { + /* XXX: default values not correct for B and XR channels, + * but who cares? */ + .tqi_aifs = AR5K_TUNE_AIFS, + .tqi_cw_min = AR5K_TUNE_CWMIN, + .tqi_cw_max = AR5K_TUNE_CWMAX, + /* NB: for dynamic turbo, don't enable any other interrupts */ + .tqi_flags = AR5K_TXQ_FLAG_TXDESCINT_ENABLE + }; + + return ath5k_hw_setup_tx_queue(ah, AR5K_TX_QUEUE_BEACON, &qi); +} + +static int +ath5k_beaconq_config(struct ath5k_hw *ah) +{ + struct ath5k_txq_info qi; + int ret; + + ret = ath5k_hw_get_tx_queueprops(ah, ah->bhalq, &qi); + if (ret) + goto err; + + if (ah->opmode == NL80211_IFTYPE_AP || + ah->opmode == NL80211_IFTYPE_MESH_POINT) { + /* + * Always burst out beacon and CAB traffic + * (aifs = cwmin = cwmax = 0) + */ + qi.tqi_aifs = 0; + qi.tqi_cw_min = 0; + qi.tqi_cw_max = 0; + } else if (ah->opmode == NL80211_IFTYPE_ADHOC) { + /* + * Adhoc mode; backoff between 0 and (2 * cw_min). + */ + qi.tqi_aifs = 0; + qi.tqi_cw_min = 0; + qi.tqi_cw_max = 2 * AR5K_TUNE_CWMIN; + } + + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, + "beacon queueprops tqi_aifs:%d tqi_cw_min:%d tqi_cw_max:%d\n", + qi.tqi_aifs, qi.tqi_cw_min, qi.tqi_cw_max); + + ret = ath5k_hw_set_tx_queueprops(ah, ah->bhalq, &qi); + if (ret) { + ATH5K_ERR(ah, "%s: unable to update parameters for beacon " + "hardware queue!\n", __func__); + goto err; + } + ret = ath5k_hw_reset_tx_queue(ah, ah->bhalq); /* push to h/w */ + if (ret) + goto err; + + /* reconfigure cabq with ready time to 80% of beacon_interval */ + ret = ath5k_hw_get_tx_queueprops(ah, AR5K_TX_QUEUE_ID_CAB, &qi); + if (ret) + goto err; + + qi.tqi_ready_time = (ah->bintval * 80) / 100; + ret = ath5k_hw_set_tx_queueprops(ah, AR5K_TX_QUEUE_ID_CAB, &qi); + if (ret) + goto err; + + ret = ath5k_hw_reset_tx_queue(ah, AR5K_TX_QUEUE_ID_CAB); +err: + return ret; +} + +/** + * ath5k_drain_tx_buffs - Empty tx buffers + * + * @ah: The &struct ath5k_hw + * + * Empty tx buffers from all queues in preparation + * of a reset or during shutdown. + * + * NB: this assumes output has been stopped and + * we do not need to block ath5k_tx_tasklet + */ +static void +ath5k_drain_tx_buffs(struct ath5k_hw *ah) +{ + struct ath5k_txq *txq; + struct ath5k_buf *bf, *bf0; + int i; + + for (i = 0; i < ARRAY_SIZE(ah->txqs); i++) { + if (ah->txqs[i].setup) { + txq = &ah->txqs[i]; + spin_lock_bh(&txq->lock); + list_for_each_entry_safe(bf, bf0, &txq->q, list) { + ath5k_debug_printtxbuf(ah, bf); + + ath5k_txbuf_free_skb(ah, bf); + + spin_lock(&ah->txbuflock); + list_move_tail(&bf->list, &ah->txbuf); + ah->txbuf_len++; + txq->txq_len--; + spin_unlock(&ah->txbuflock); + } + txq->link = NULL; + txq->txq_poll_mark = false; + spin_unlock_bh(&txq->lock); + } + } +} + +static void +ath5k_txq_release(struct ath5k_hw *ah) +{ + struct ath5k_txq *txq = ah->txqs; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(ah->txqs); i++, txq++) + if (txq->setup) { + ath5k_hw_release_tx_queue(ah, txq->qnum); + txq->setup = false; + } +} + + +/*************\ +* RX Handling * +\*************/ + +/* + * Enable the receive h/w following a reset. + */ +static int +ath5k_rx_start(struct ath5k_hw *ah) +{ + struct ath_common *common = ath5k_hw_common(ah); + struct ath5k_buf *bf; + int ret; + + common->rx_bufsize = roundup(IEEE80211_MAX_FRAME_LEN, common->cachelsz); + + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, "cachelsz %u rx_bufsize %u\n", + common->cachelsz, common->rx_bufsize); + + spin_lock_bh(&ah->rxbuflock); + ah->rxlink = NULL; + list_for_each_entry(bf, &ah->rxbuf, list) { + ret = ath5k_rxbuf_setup(ah, bf); + if (ret != 0) { + spin_unlock_bh(&ah->rxbuflock); + goto err; + } + } + bf = list_first_entry(&ah->rxbuf, struct ath5k_buf, list); + ath5k_hw_set_rxdp(ah, bf->daddr); + spin_unlock_bh(&ah->rxbuflock); + + ath5k_hw_start_rx_dma(ah); /* enable recv descriptors */ + ath5k_update_bssid_mask_and_opmode(ah, NULL); /* set filters, etc. */ + ath5k_hw_start_rx_pcu(ah); /* re-enable PCU/DMA engine */ + + return 0; +err: + return ret; +} + +/* + * Disable the receive logic on PCU (DRU) + * In preparation for a shutdown. + * + * Note: Doesn't stop rx DMA, ath5k_hw_dma_stop + * does. + */ +static void +ath5k_rx_stop(struct ath5k_hw *ah) +{ + + ath5k_hw_set_rx_filter(ah, 0); /* clear recv filter */ + ath5k_hw_stop_rx_pcu(ah); /* disable PCU */ + + ath5k_debug_printrxbuffs(ah); +} + +static unsigned int +ath5k_rx_decrypted(struct ath5k_hw *ah, struct sk_buff *skb, + struct ath5k_rx_status *rs) +{ + struct ath_common *common = ath5k_hw_common(ah); + struct ieee80211_hdr *hdr = (void *)skb->data; + unsigned int keyix, hlen; + + if (!(rs->rs_status & AR5K_RXERR_DECRYPT) && + rs->rs_keyix != AR5K_RXKEYIX_INVALID) + return RX_FLAG_DECRYPTED; + + /* Apparently when a default key is used to decrypt the packet + the hw does not set the index used to decrypt. In such cases + get the index from the packet. */ + hlen = ieee80211_hdrlen(hdr->frame_control); + if (ieee80211_has_protected(hdr->frame_control) && + !(rs->rs_status & AR5K_RXERR_DECRYPT) && + skb->len >= hlen + 4) { + keyix = skb->data[hlen + 3] >> 6; + + if (test_bit(keyix, common->keymap)) + return RX_FLAG_DECRYPTED; + } + + return 0; +} + + +static void +ath5k_check_ibss_tsf(struct ath5k_hw *ah, struct sk_buff *skb, + struct ieee80211_rx_status *rxs) +{ + u64 tsf, bc_tstamp; + u32 hw_tu; + struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data; + + if (le16_to_cpu(mgmt->u.beacon.capab_info) & WLAN_CAPABILITY_IBSS) { + /* + * Received an IBSS beacon with the same BSSID. Hardware *must* + * have updated the local TSF. We have to work around various + * hardware bugs, though... + */ + tsf = ath5k_hw_get_tsf64(ah); + bc_tstamp = le64_to_cpu(mgmt->u.beacon.timestamp); + hw_tu = TSF_TO_TU(tsf); + + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "beacon %llx mactime %llx (diff %lld) tsf now %llx\n", + (unsigned long long)bc_tstamp, + (unsigned long long)rxs->mactime, + (unsigned long long)(rxs->mactime - bc_tstamp), + (unsigned long long)tsf); + + /* + * Sometimes the HW will give us a wrong tstamp in the rx + * status, causing the timestamp extension to go wrong. + * (This seems to happen especially with beacon frames bigger + * than 78 byte (incl. FCS)) + * But we know that the receive timestamp must be later than the + * timestamp of the beacon since HW must have synced to that. + * + * NOTE: here we assume mactime to be after the frame was + * received, not like mac80211 which defines it at the start. + */ + if (bc_tstamp > rxs->mactime) { + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "fixing mactime from %llx to %llx\n", + (unsigned long long)rxs->mactime, + (unsigned long long)tsf); + rxs->mactime = tsf; + } + + /* + * Local TSF might have moved higher than our beacon timers, + * in that case we have to update them to continue sending + * beacons. This also takes care of synchronizing beacon sending + * times with other stations. + */ + if (hw_tu >= ah->nexttbtt) + ath5k_beacon_update_timers(ah, bc_tstamp); + + /* Check if the beacon timers are still correct, because a TSF + * update might have created a window between them - for a + * longer description see the comment of this function: */ + if (!ath5k_hw_check_beacon_timers(ah, ah->bintval)) { + ath5k_beacon_update_timers(ah, bc_tstamp); + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "fixed beacon timers after beacon receive\n"); + } + } +} + +/* + * Compute padding position. skb must contain an IEEE 802.11 frame + */ +static int ath5k_common_padpos(struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + __le16 frame_control = hdr->frame_control; + int padpos = 24; + + if (ieee80211_has_a4(frame_control)) + padpos += ETH_ALEN; + + if (ieee80211_is_data_qos(frame_control)) + padpos += IEEE80211_QOS_CTL_LEN; + + return padpos; +} + +/* + * This function expects an 802.11 frame and returns the number of + * bytes added, or -1 if we don't have enough header room. + */ +static int ath5k_add_padding(struct sk_buff *skb) +{ + int padpos = ath5k_common_padpos(skb); + int padsize = padpos & 3; + + if (padsize && skb->len > padpos) { + + if (skb_headroom(skb) < padsize) + return -1; + + skb_push(skb, padsize); + memmove(skb->data, skb->data + padsize, padpos); + return padsize; + } + + return 0; +} + +/* + * The MAC header is padded to have 32-bit boundary if the + * packet payload is non-zero. The general calculation for + * padsize would take into account odd header lengths: + * padsize = 4 - (hdrlen & 3); however, since only + * even-length headers are used, padding can only be 0 or 2 + * bytes and we can optimize this a bit. We must not try to + * remove padding from short control frames that do not have a + * payload. + * + * This function expects an 802.11 frame and returns the number of + * bytes removed. + */ +static int ath5k_remove_padding(struct sk_buff *skb) +{ + int padpos = ath5k_common_padpos(skb); + int padsize = padpos & 3; + + if (padsize && skb->len >= padpos + padsize) { + memmove(skb->data + padsize, skb->data, padpos); + skb_pull(skb, padsize); + return padsize; + } + + return 0; +} + +static void +ath5k_receive_frame(struct ath5k_hw *ah, struct sk_buff *skb, + struct ath5k_rx_status *rs) +{ + struct ieee80211_rx_status *rxs; + struct ath_common *common = ath5k_hw_common(ah); + + ath5k_remove_padding(skb); + + rxs = IEEE80211_SKB_RXCB(skb); + + rxs->flag = 0; + if (unlikely(rs->rs_status & AR5K_RXERR_MIC)) + rxs->flag |= RX_FLAG_MMIC_ERROR; + if (unlikely(rs->rs_status & AR5K_RXERR_CRC)) + rxs->flag |= RX_FLAG_FAILED_FCS_CRC; + + + /* + * always extend the mac timestamp, since this information is + * also needed for proper IBSS merging. + * + * XXX: it might be too late to do it here, since rs_tstamp is + * 15bit only. that means TSF extension has to be done within + * 32768usec (about 32ms). it might be necessary to move this to + * the interrupt handler, like it is done in madwifi. + */ + rxs->mactime = ath5k_extend_tsf(ah, rs->rs_tstamp); + rxs->flag |= RX_FLAG_MACTIME_END; + + rxs->freq = ah->curchan->center_freq; + rxs->band = ah->curchan->band; + + rxs->signal = ah->ah_noise_floor + rs->rs_rssi; + + rxs->antenna = rs->rs_antenna; + + if (rs->rs_antenna > 0 && rs->rs_antenna < 5) + ah->stats.antenna_rx[rs->rs_antenna]++; + else + ah->stats.antenna_rx[0]++; /* invalid */ + + rxs->rate_idx = ath5k_hw_to_driver_rix(ah, rs->rs_rate); + rxs->flag |= ath5k_rx_decrypted(ah, skb, rs); + switch (ah->ah_bwmode) { + case AR5K_BWMODE_5MHZ: + rxs->bw = RATE_INFO_BW_5; + break; + case AR5K_BWMODE_10MHZ: + rxs->bw = RATE_INFO_BW_10; + break; + default: + break; + } + + if (rs->rs_rate == + ah->sbands[ah->curchan->band].bitrates[rxs->rate_idx].hw_value_short) + rxs->enc_flags |= RX_ENC_FLAG_SHORTPRE; + + trace_ath5k_rx(ah, skb); + + if (ath_is_mybeacon(common, (struct ieee80211_hdr *)skb->data)) { + ewma_beacon_rssi_add(&ah->ah_beacon_rssi_avg, rs->rs_rssi); + + /* check beacons in IBSS mode */ + if (ah->opmode == NL80211_IFTYPE_ADHOC) + ath5k_check_ibss_tsf(ah, skb, rxs); + } + + ieee80211_rx(ah->hw, skb); +} + +/** ath5k_frame_receive_ok() - Do we want to receive this frame or not? + * + * Check if we want to further process this frame or not. Also update + * statistics. Return true if we want this frame, false if not. + */ +static bool +ath5k_receive_frame_ok(struct ath5k_hw *ah, struct ath5k_rx_status *rs) +{ + ah->stats.rx_all_count++; + ah->stats.rx_bytes_count += rs->rs_datalen; + + if (unlikely(rs->rs_status)) { + unsigned int filters; + + if (rs->rs_status & AR5K_RXERR_CRC) + ah->stats.rxerr_crc++; + if (rs->rs_status & AR5K_RXERR_FIFO) + ah->stats.rxerr_fifo++; + if (rs->rs_status & AR5K_RXERR_PHY) { + ah->stats.rxerr_phy++; + if (rs->rs_phyerr > 0 && rs->rs_phyerr < 32) + ah->stats.rxerr_phy_code[rs->rs_phyerr]++; + + /* + * Treat packets that underwent a CCK or OFDM reset as having a bad CRC. + * These restarts happen when the radio resynchronizes to a stronger frame + * while receiving a weaker frame. Here we receive the prefix of the weak + * frame. Since these are incomplete packets, mark their CRC as invalid. + */ + if (rs->rs_phyerr == AR5K_RX_PHY_ERROR_OFDM_RESTART || + rs->rs_phyerr == AR5K_RX_PHY_ERROR_CCK_RESTART) { + rs->rs_status |= AR5K_RXERR_CRC; + rs->rs_status &= ~AR5K_RXERR_PHY; + } else { + return false; + } + } + if (rs->rs_status & AR5K_RXERR_DECRYPT) { + /* + * Decrypt error. If the error occurred + * because there was no hardware key, then + * let the frame through so the upper layers + * can process it. This is necessary for 5210 + * parts which have no way to setup a ``clear'' + * key cache entry. + * + * XXX do key cache faulting + */ + ah->stats.rxerr_decrypt++; + if (rs->rs_keyix == AR5K_RXKEYIX_INVALID && + !(rs->rs_status & AR5K_RXERR_CRC)) + return true; + } + if (rs->rs_status & AR5K_RXERR_MIC) { + ah->stats.rxerr_mic++; + return true; + } + + /* + * Reject any frames with non-crypto errors, and take into account the + * current FIF_* filters. + */ + filters = AR5K_RXERR_DECRYPT; + if (ah->fif_filter_flags & FIF_FCSFAIL) + filters |= AR5K_RXERR_CRC; + + if (rs->rs_status & ~filters) + return false; + } + + if (unlikely(rs->rs_more)) { + ah->stats.rxerr_jumbo++; + return false; + } + return true; +} + +static void +ath5k_set_current_imask(struct ath5k_hw *ah) +{ + enum ath5k_int imask; + unsigned long flags; + + if (test_bit(ATH_STAT_RESET, ah->status)) + return; + + spin_lock_irqsave(&ah->irqlock, flags); + imask = ah->imask; + if (ah->rx_pending) + imask &= ~AR5K_INT_RX_ALL; + if (ah->tx_pending) + imask &= ~AR5K_INT_TX_ALL; + ath5k_hw_set_imr(ah, imask); + spin_unlock_irqrestore(&ah->irqlock, flags); +} + +static void +ath5k_tasklet_rx(struct tasklet_struct *t) +{ + struct ath5k_rx_status rs = {}; + struct sk_buff *skb, *next_skb; + dma_addr_t next_skb_addr; + struct ath5k_hw *ah = from_tasklet(ah, t, rxtq); + struct ath_common *common = ath5k_hw_common(ah); + struct ath5k_buf *bf; + struct ath5k_desc *ds; + int ret; + + spin_lock(&ah->rxbuflock); + if (list_empty(&ah->rxbuf)) { + ATH5K_WARN(ah, "empty rx buf pool\n"); + goto unlock; + } + do { + bf = list_first_entry(&ah->rxbuf, struct ath5k_buf, list); + BUG_ON(bf->skb == NULL); + skb = bf->skb; + ds = bf->desc; + + /* bail if HW is still using self-linked descriptor */ + if (ath5k_hw_get_rxdp(ah) == bf->daddr) + break; + + ret = ah->ah_proc_rx_desc(ah, ds, &rs); + if (unlikely(ret == -EINPROGRESS)) + break; + else if (unlikely(ret)) { + ATH5K_ERR(ah, "error in processing rx descriptor\n"); + ah->stats.rxerr_proc++; + break; + } + + if (ath5k_receive_frame_ok(ah, &rs)) { + next_skb = ath5k_rx_skb_alloc(ah, &next_skb_addr); + + /* + * If we can't replace bf->skb with a new skb under + * memory pressure, just skip this packet + */ + if (!next_skb) + goto next; + + dma_unmap_single(ah->dev, bf->skbaddr, + common->rx_bufsize, + DMA_FROM_DEVICE); + + skb_put(skb, rs.rs_datalen); + + ath5k_receive_frame(ah, skb, &rs); + + bf->skb = next_skb; + bf->skbaddr = next_skb_addr; + } +next: + list_move_tail(&bf->list, &ah->rxbuf); + } while (ath5k_rxbuf_setup(ah, bf) == 0); +unlock: + spin_unlock(&ah->rxbuflock); + ah->rx_pending = false; + ath5k_set_current_imask(ah); +} + + +/*************\ +* TX Handling * +\*************/ + +void +ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, + struct ath5k_txq *txq, struct ieee80211_tx_control *control) +{ + struct ath5k_hw *ah = hw->priv; + struct ath5k_buf *bf; + unsigned long flags; + int padsize; + + trace_ath5k_tx(ah, skb, txq); + + /* + * The hardware expects the header padded to 4 byte boundaries. + * If this is not the case, we add the padding after the header. + */ + padsize = ath5k_add_padding(skb); + if (padsize < 0) { + ATH5K_ERR(ah, "tx hdrlen not %%4: not enough" + " headroom to pad"); + goto drop_packet; + } + + if (txq->txq_len >= txq->txq_max && + txq->qnum <= AR5K_TX_QUEUE_ID_DATA_MAX) + ieee80211_stop_queue(hw, txq->qnum); + + spin_lock_irqsave(&ah->txbuflock, flags); + if (list_empty(&ah->txbuf)) { + ATH5K_ERR(ah, "no further txbuf available, dropping packet\n"); + spin_unlock_irqrestore(&ah->txbuflock, flags); + ieee80211_stop_queues(hw); + goto drop_packet; + } + bf = list_first_entry(&ah->txbuf, struct ath5k_buf, list); + list_del(&bf->list); + ah->txbuf_len--; + if (list_empty(&ah->txbuf)) + ieee80211_stop_queues(hw); + spin_unlock_irqrestore(&ah->txbuflock, flags); + + bf->skb = skb; + + if (ath5k_txbuf_setup(ah, bf, txq, padsize, control)) { + bf->skb = NULL; + spin_lock_irqsave(&ah->txbuflock, flags); + list_add_tail(&bf->list, &ah->txbuf); + ah->txbuf_len++; + spin_unlock_irqrestore(&ah->txbuflock, flags); + goto drop_packet; + } + return; + +drop_packet: + ieee80211_free_txskb(hw, skb); +} + +static void +ath5k_tx_frame_completed(struct ath5k_hw *ah, struct sk_buff *skb, + struct ath5k_txq *txq, struct ath5k_tx_status *ts, + struct ath5k_buf *bf) +{ + struct ieee80211_tx_info *info; + u8 tries[3]; + int i; + int size = 0; + + ah->stats.tx_all_count++; + ah->stats.tx_bytes_count += skb->len; + info = IEEE80211_SKB_CB(skb); + + size = min_t(int, sizeof(info->status.rates), sizeof(bf->rates)); + memcpy(info->status.rates, bf->rates, size); + + tries[0] = info->status.rates[0].count; + tries[1] = info->status.rates[1].count; + tries[2] = info->status.rates[2].count; + + ieee80211_tx_info_clear_status(info); + + for (i = 0; i < ts->ts_final_idx; i++) { + struct ieee80211_tx_rate *r = + &info->status.rates[i]; + + r->count = tries[i]; + } + + info->status.rates[ts->ts_final_idx].count = ts->ts_final_retry; + info->status.rates[ts->ts_final_idx + 1].idx = -1; + + if (unlikely(ts->ts_status)) { + ah->stats.ack_fail++; + if (ts->ts_status & AR5K_TXERR_FILT) { + info->flags |= IEEE80211_TX_STAT_TX_FILTERED; + ah->stats.txerr_filt++; + } + if (ts->ts_status & AR5K_TXERR_XRETRY) + ah->stats.txerr_retry++; + if (ts->ts_status & AR5K_TXERR_FIFO) + ah->stats.txerr_fifo++; + } else { + info->flags |= IEEE80211_TX_STAT_ACK; + info->status.ack_signal = ts->ts_rssi; + + /* count the successful attempt as well */ + info->status.rates[ts->ts_final_idx].count++; + } + + /* + * Remove MAC header padding before giving the frame + * back to mac80211. + */ + ath5k_remove_padding(skb); + + if (ts->ts_antenna > 0 && ts->ts_antenna < 5) + ah->stats.antenna_tx[ts->ts_antenna]++; + else + ah->stats.antenna_tx[0]++; /* invalid */ + + trace_ath5k_tx_complete(ah, skb, txq, ts); + ieee80211_tx_status(ah->hw, skb); +} + +static void +ath5k_tx_processq(struct ath5k_hw *ah, struct ath5k_txq *txq) +{ + struct ath5k_tx_status ts = {}; + struct ath5k_buf *bf, *bf0; + struct ath5k_desc *ds; + struct sk_buff *skb; + int ret; + + spin_lock(&txq->lock); + list_for_each_entry_safe(bf, bf0, &txq->q, list) { + + txq->txq_poll_mark = false; + + /* skb might already have been processed last time. */ + if (bf->skb != NULL) { + ds = bf->desc; + + ret = ah->ah_proc_tx_desc(ah, ds, &ts); + if (unlikely(ret == -EINPROGRESS)) + break; + else if (unlikely(ret)) { + ATH5K_ERR(ah, + "error %d while processing " + "queue %u\n", ret, txq->qnum); + break; + } + + skb = bf->skb; + bf->skb = NULL; + + dma_unmap_single(ah->dev, bf->skbaddr, skb->len, + DMA_TO_DEVICE); + ath5k_tx_frame_completed(ah, skb, txq, &ts, bf); + } + + /* + * It's possible that the hardware can say the buffer is + * completed when it hasn't yet loaded the ds_link from + * host memory and moved on. + * Always keep the last descriptor to avoid HW races... + */ + if (ath5k_hw_get_txdp(ah, txq->qnum) != bf->daddr) { + spin_lock(&ah->txbuflock); + list_move_tail(&bf->list, &ah->txbuf); + ah->txbuf_len++; + txq->txq_len--; + spin_unlock(&ah->txbuflock); + } + } + spin_unlock(&txq->lock); + if (txq->txq_len < ATH5K_TXQ_LEN_LOW && txq->qnum < 4) + ieee80211_wake_queue(ah->hw, txq->qnum); +} + +static void +ath5k_tasklet_tx(struct tasklet_struct *t) +{ + int i; + struct ath5k_hw *ah = from_tasklet(ah, t, txtq); + + for (i = 0; i < AR5K_NUM_TX_QUEUES; i++) + if (ah->txqs[i].setup && (ah->ah_txq_isr_txok_all & BIT(i))) + ath5k_tx_processq(ah, &ah->txqs[i]); + + ah->tx_pending = false; + ath5k_set_current_imask(ah); +} + + +/*****************\ +* Beacon handling * +\*****************/ + +/* + * Setup the beacon frame for transmit. + */ +static int +ath5k_beacon_setup(struct ath5k_hw *ah, struct ath5k_buf *bf) +{ + struct sk_buff *skb = bf->skb; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ath5k_desc *ds; + int ret = 0; + u8 antenna; + u32 flags; + const int padsize = 0; + + bf->skbaddr = dma_map_single(ah->dev, skb->data, skb->len, + DMA_TO_DEVICE); + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, "skb %p [data %p len %u] " + "skbaddr %llx\n", skb, skb->data, skb->len, + (unsigned long long)bf->skbaddr); + + if (dma_mapping_error(ah->dev, bf->skbaddr)) { + ATH5K_ERR(ah, "beacon DMA mapping failed\n"); + dev_kfree_skb_any(skb); + bf->skb = NULL; + return -EIO; + } + + ds = bf->desc; + antenna = ah->ah_tx_ant; + + flags = AR5K_TXDESC_NOACK; + if (ah->opmode == NL80211_IFTYPE_ADHOC && ath5k_hw_hasveol(ah)) { + ds->ds_link = bf->daddr; /* self-linked */ + flags |= AR5K_TXDESC_VEOL; + } else + ds->ds_link = 0; + + /* + * If we use multiple antennas on AP and use + * the Sectored AP scenario, switch antenna every + * 4 beacons to make sure everybody hears our AP. + * When a client tries to associate, hw will keep + * track of the tx antenna to be used for this client + * automatically, based on ACKed packets. + * + * Note: AP still listens and transmits RTS on the + * default antenna which is supposed to be an omni. + * + * Note2: On sectored scenarios it's possible to have + * multiple antennas (1 omni -- the default -- and 14 + * sectors), so if we choose to actually support this + * mode, we need to allow the user to set how many antennas + * we have and tweak the code below to send beacons + * on all of them. + */ + if (ah->ah_ant_mode == AR5K_ANTMODE_SECTOR_AP) + antenna = ah->bsent & 4 ? 2 : 1; + + + /* FIXME: If we are in g mode and rate is a CCK rate + * subtract ah->ah_txpower.txp_cck_ofdm_pwr_delta + * from tx power (value is in dB units already) */ + ds->ds_data = bf->skbaddr; + ret = ah->ah_setup_tx_desc(ah, ds, skb->len, + ieee80211_get_hdrlen_from_skb(skb), padsize, + AR5K_PKT_TYPE_BEACON, + (ah->ah_txpower.txp_requested * 2), + ieee80211_get_tx_rate(ah->hw, info)->hw_value, + 1, AR5K_TXKEYIX_INVALID, + antenna, flags, 0, 0); + if (ret) + goto err_unmap; + + return 0; +err_unmap: + dma_unmap_single(ah->dev, bf->skbaddr, skb->len, DMA_TO_DEVICE); + return ret; +} + +/* + * Updates the beacon that is sent by ath5k_beacon_send. For adhoc, + * this is called only once at config_bss time, for AP we do it every + * SWBA interrupt so that the TIM will reflect buffered frames. + * + * Called with the beacon lock. + */ +int +ath5k_beacon_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif) +{ + int ret; + struct ath5k_hw *ah = hw->priv; + struct ath5k_vif *avf; + struct sk_buff *skb; + + if (WARN_ON(!vif)) { + ret = -EINVAL; + goto out; + } + + skb = ieee80211_beacon_get(hw, vif, 0); + + if (!skb) { + ret = -ENOMEM; + goto out; + } + + avf = (void *)vif->drv_priv; + ath5k_txbuf_free_skb(ah, avf->bbuf); + avf->bbuf->skb = skb; + ret = ath5k_beacon_setup(ah, avf->bbuf); +out: + return ret; +} + +/* + * Transmit a beacon frame at SWBA. Dynamic updates to the + * frame contents are done as needed and the slot time is + * also adjusted based on current state. + * + * This is called from software irq context (beacontq tasklets) + * or user context from ath5k_beacon_config. + */ +static void +ath5k_beacon_send(struct ath5k_hw *ah) +{ + struct ieee80211_vif *vif; + struct ath5k_vif *avf; + struct ath5k_buf *bf; + struct sk_buff *skb; + int err; + + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, "in beacon_send\n"); + + /* + * Check if the previous beacon has gone out. If + * not, don't try to post another: skip this + * period and wait for the next. Missed beacons + * indicate a problem and should not occur. If we + * miss too many consecutive beacons reset the device. + */ + if (unlikely(ath5k_hw_num_tx_pending(ah, ah->bhalq) != 0)) { + ah->bmisscount++; + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, + "missed %u consecutive beacons\n", ah->bmisscount); + if (ah->bmisscount > 10) { /* NB: 10 is a guess */ + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, + "stuck beacon time (%u missed)\n", + ah->bmisscount); + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "stuck beacon, resetting\n"); + ieee80211_queue_work(ah->hw, &ah->reset_work); + } + return; + } + if (unlikely(ah->bmisscount != 0)) { + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, + "resume beacon xmit after %u misses\n", + ah->bmisscount); + ah->bmisscount = 0; + } + + if ((ah->opmode == NL80211_IFTYPE_AP && ah->num_ap_vifs + + ah->num_mesh_vifs > 1) || + ah->opmode == NL80211_IFTYPE_MESH_POINT) { + u64 tsf = ath5k_hw_get_tsf64(ah); + u32 tsftu = TSF_TO_TU(tsf); + int slot = ((tsftu % ah->bintval) * ATH_BCBUF) / ah->bintval; + vif = ah->bslot[(slot + 1) % ATH_BCBUF]; + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, + "tsf %llx tsftu %x intval %u slot %u vif %p\n", + (unsigned long long)tsf, tsftu, ah->bintval, slot, vif); + } else /* only one interface */ + vif = ah->bslot[0]; + + if (!vif) + return; + + avf = (void *)vif->drv_priv; + bf = avf->bbuf; + + /* + * Stop any current dma and put the new frame on the queue. + * This should never fail since we check above that no frames + * are still pending on the queue. + */ + if (unlikely(ath5k_hw_stop_beacon_queue(ah, ah->bhalq))) { + ATH5K_WARN(ah, "beacon queue %u didn't start/stop ?\n", ah->bhalq); + /* NB: hw still stops DMA, so proceed */ + } + + /* refresh the beacon for AP or MESH mode */ + if (ah->opmode == NL80211_IFTYPE_AP || + ah->opmode == NL80211_IFTYPE_MESH_POINT) { + err = ath5k_beacon_update(ah->hw, vif); + if (err) + return; + } + + if (unlikely(bf->skb == NULL || ah->opmode == NL80211_IFTYPE_STATION || + ah->opmode == NL80211_IFTYPE_MONITOR)) { + ATH5K_WARN(ah, "bf=%p bf_skb=%p\n", bf, bf->skb); + return; + } + + trace_ath5k_tx(ah, bf->skb, &ah->txqs[ah->bhalq]); + + ath5k_hw_set_txdp(ah, ah->bhalq, bf->daddr); + ath5k_hw_start_tx_dma(ah, ah->bhalq); + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, "TXDP[%u] = %llx (%p)\n", + ah->bhalq, (unsigned long long)bf->daddr, bf->desc); + + skb = ieee80211_get_buffered_bc(ah->hw, vif); + while (skb) { + ath5k_tx_queue(ah->hw, skb, ah->cabq, NULL); + + if (ah->cabq->txq_len >= ah->cabq->txq_max) + break; + + skb = ieee80211_get_buffered_bc(ah->hw, vif); + } + + ah->bsent++; +} + +/** + * ath5k_beacon_update_timers - update beacon timers + * + * @ah: struct ath5k_hw pointer we are operating on + * @bc_tsf: the timestamp of the beacon. 0 to reset the TSF. -1 to perform a + * beacon timer update based on the current HW TSF. + * + * Calculate the next target beacon transmit time (TBTT) based on the timestamp + * of a received beacon or the current local hardware TSF and write it to the + * beacon timer registers. + * + * This is called in a variety of situations, e.g. when a beacon is received, + * when a TSF update has been detected, but also when an new IBSS is created or + * when we otherwise know we have to update the timers, but we keep it in this + * function to have it all together in one place. + */ +void +ath5k_beacon_update_timers(struct ath5k_hw *ah, u64 bc_tsf) +{ + u32 nexttbtt, intval, hw_tu, bc_tu; + u64 hw_tsf; + + intval = ah->bintval & AR5K_BEACON_PERIOD; + if (ah->opmode == NL80211_IFTYPE_AP && ah->num_ap_vifs + + ah->num_mesh_vifs > 1) { + intval /= ATH_BCBUF; /* staggered multi-bss beacons */ + if (intval < 15) + ATH5K_WARN(ah, "intval %u is too low, min 15\n", + intval); + } + if (WARN_ON(!intval)) + return; + + /* beacon TSF converted to TU */ + bc_tu = TSF_TO_TU(bc_tsf); + + /* current TSF converted to TU */ + hw_tsf = ath5k_hw_get_tsf64(ah); + hw_tu = TSF_TO_TU(hw_tsf); + +#define FUDGE (AR5K_TUNE_SW_BEACON_RESP + 3) + /* We use FUDGE to make sure the next TBTT is ahead of the current TU. + * Since we later subtract AR5K_TUNE_SW_BEACON_RESP (10) in the timer + * configuration we need to make sure it is bigger than that. */ + + if (bc_tsf == -1) { + /* + * no beacons received, called internally. + * just need to refresh timers based on HW TSF. + */ + nexttbtt = roundup(hw_tu + FUDGE, intval); + } else if (bc_tsf == 0) { + /* + * no beacon received, probably called by ath5k_reset_tsf(). + * reset TSF to start with 0. + */ + nexttbtt = intval; + intval |= AR5K_BEACON_RESET_TSF; + } else if (bc_tsf > hw_tsf) { + /* + * beacon received, SW merge happened but HW TSF not yet updated. + * not possible to reconfigure timers yet, but next time we + * receive a beacon with the same BSSID, the hardware will + * automatically update the TSF and then we need to reconfigure + * the timers. + */ + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "need to wait for HW TSF sync\n"); + return; + } else { + /* + * most important case for beacon synchronization between STA. + * + * beacon received and HW TSF has been already updated by HW. + * update next TBTT based on the TSF of the beacon, but make + * sure it is ahead of our local TSF timer. + */ + nexttbtt = bc_tu + roundup(hw_tu + FUDGE - bc_tu, intval); + } +#undef FUDGE + + ah->nexttbtt = nexttbtt; + + intval |= AR5K_BEACON_ENA; + ath5k_hw_init_beacon_timers(ah, nexttbtt, intval); + + /* + * debugging output last in order to preserve the time critical aspect + * of this function + */ + if (bc_tsf == -1) + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "reconfigured timers based on HW TSF\n"); + else if (bc_tsf == 0) + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "reset HW TSF and timers\n"); + else + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "updated timers based on beacon TSF\n"); + + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, + "bc_tsf %llx hw_tsf %llx bc_tu %u hw_tu %u nexttbtt %u\n", + (unsigned long long) bc_tsf, + (unsigned long long) hw_tsf, bc_tu, hw_tu, nexttbtt); + ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_BEACON, "intval %u %s %s\n", + intval & AR5K_BEACON_PERIOD, + intval & AR5K_BEACON_ENA ? "AR5K_BEACON_ENA" : "", + intval & AR5K_BEACON_RESET_TSF ? "AR5K_BEACON_RESET_TSF" : ""); +} + +/** + * ath5k_beacon_config - Configure the beacon queues and interrupts + * + * @ah: struct ath5k_hw pointer we are operating on + * + * In IBSS mode we use a self-linked tx descriptor if possible. We enable SWBA + * interrupts to detect TSF updates only. + */ +void +ath5k_beacon_config(struct ath5k_hw *ah) +{ + spin_lock_bh(&ah->block); + ah->bmisscount = 0; + ah->imask &= ~(AR5K_INT_BMISS | AR5K_INT_SWBA); + + if (ah->enable_beacon) { + /* + * In IBSS mode we use a self-linked tx descriptor and let the + * hardware send the beacons automatically. We have to load it + * only once here. + * We use the SWBA interrupt only to keep track of the beacon + * timers in order to detect automatic TSF updates. + */ + ath5k_beaconq_config(ah); + + ah->imask |= AR5K_INT_SWBA; + + if (ah->opmode == NL80211_IFTYPE_ADHOC) { + if (ath5k_hw_hasveol(ah)) + ath5k_beacon_send(ah); + } else + ath5k_beacon_update_timers(ah, -1); + } else { + ath5k_hw_stop_beacon_queue(ah, ah->bhalq); + } + + ath5k_hw_set_imr(ah, ah->imask); + spin_unlock_bh(&ah->block); +} + +static void ath5k_tasklet_beacon(struct tasklet_struct *t) +{ + struct ath5k_hw *ah = from_tasklet(ah, t, beacontq); + + /* + * Software beacon alert--time to send a beacon. + * + * In IBSS mode we use this interrupt just to + * keep track of the next TBTT (target beacon + * transmission time) in order to detect whether + * automatic TSF updates happened. + */ + if (ah->opmode == NL80211_IFTYPE_ADHOC) { + /* XXX: only if VEOL supported */ + u64 tsf = ath5k_hw_get_tsf64(ah); + ah->nexttbtt += ah->bintval; + ATH5K_DBG(ah, ATH5K_DEBUG_BEACON, + "SWBA nexttbtt: %x hw_tu: %x " + "TSF: %llx\n", + ah->nexttbtt, + TSF_TO_TU(tsf), + (unsigned long long) tsf); + } else { + spin_lock(&ah->block); + ath5k_beacon_send(ah); + spin_unlock(&ah->block); + } +} + + +/********************\ +* Interrupt handling * +\********************/ + +static void +ath5k_intr_calibration_poll(struct ath5k_hw *ah) +{ + if (time_is_before_eq_jiffies(ah->ah_cal_next_ani) && + !(ah->ah_cal_mask & AR5K_CALIBRATION_FULL) && + !(ah->ah_cal_mask & AR5K_CALIBRATION_SHORT)) { + + /* Run ANI only when calibration is not active */ + + ah->ah_cal_next_ani = jiffies + + msecs_to_jiffies(ATH5K_TUNE_CALIBRATION_INTERVAL_ANI); + tasklet_schedule(&ah->ani_tasklet); + + } else if (time_is_before_eq_jiffies(ah->ah_cal_next_short) && + !(ah->ah_cal_mask & AR5K_CALIBRATION_FULL) && + !(ah->ah_cal_mask & AR5K_CALIBRATION_SHORT)) { + + /* Run calibration only when another calibration + * is not running. + * + * Note: This is for both full/short calibration, + * if it's time for a full one, ath5k_calibrate_work will deal + * with it. */ + + ah->ah_cal_next_short = jiffies + + msecs_to_jiffies(ATH5K_TUNE_CALIBRATION_INTERVAL_SHORT); + ieee80211_queue_work(ah->hw, &ah->calib_work); + } + /* we could use SWI to generate enough interrupts to meet our + * calibration interval requirements, if necessary: + * AR5K_REG_ENABLE_BITS(ah, AR5K_CR, AR5K_CR_SWI); */ +} + +static void +ath5k_schedule_rx(struct ath5k_hw *ah) +{ + ah->rx_pending = true; + tasklet_schedule(&ah->rxtq); +} + +static void +ath5k_schedule_tx(struct ath5k_hw *ah) +{ + ah->tx_pending = true; + tasklet_schedule(&ah->txtq); +} + +static irqreturn_t +ath5k_intr(int irq, void *dev_id) +{ + struct ath5k_hw *ah = dev_id; + enum ath5k_int status; + unsigned int counter = 1000; + + + /* + * If hw is not ready (or detached) and we get an + * interrupt, or if we have no interrupts pending + * (that means it's not for us) skip it. + * + * NOTE: Group 0/1 PCI interface registers are not + * supported on WiSOCs, so we can't check for pending + * interrupts (ISR belongs to another register group + * so we are ok). + */ + if (unlikely(test_bit(ATH_STAT_INVALID, ah->status) || + ((ath5k_get_bus_type(ah) != ATH_AHB) && + !ath5k_hw_is_intr_pending(ah)))) + return IRQ_NONE; + + /** Main loop **/ + do { + ath5k_hw_get_isr(ah, &status); /* NB: clears IRQ too */ + + ATH5K_DBG(ah, ATH5K_DEBUG_INTR, "status 0x%x/0x%x\n", + status, ah->imask); + + /* + * Fatal hw error -> Log and reset + * + * Fatal errors are unrecoverable so we have to + * reset the card. These errors include bus and + * dma errors. + */ + if (unlikely(status & AR5K_INT_FATAL)) { + + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "fatal int, resetting\n"); + ieee80211_queue_work(ah->hw, &ah->reset_work); + + /* + * RX Overrun -> Count and reset if needed + * + * Receive buffers are full. Either the bus is busy or + * the CPU is not fast enough to process all received + * frames. + */ + } else if (unlikely(status & AR5K_INT_RXORN)) { + + /* + * Older chipsets need a reset to come out of this + * condition, but we treat it as RX for newer chips. + * We don't know exactly which versions need a reset + * this guess is copied from the HAL. + */ + ah->stats.rxorn_intr++; + + if (ah->ah_mac_srev < AR5K_SREV_AR5212) { + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "rx overrun, resetting\n"); + ieee80211_queue_work(ah->hw, &ah->reset_work); + } else + ath5k_schedule_rx(ah); + + } else { + + /* Software Beacon Alert -> Schedule beacon tasklet */ + if (status & AR5K_INT_SWBA) + tasklet_hi_schedule(&ah->beacontq); + + /* + * No more RX descriptors -> Just count + * + * NB: the hardware should re-read the link when + * RXE bit is written, but it doesn't work at + * least on older hardware revs. + */ + if (status & AR5K_INT_RXEOL) + ah->stats.rxeol_intr++; + + + /* TX Underrun -> Bump tx trigger level */ + if (status & AR5K_INT_TXURN) + ath5k_hw_update_tx_triglevel(ah, true); + + /* RX -> Schedule rx tasklet */ + if (status & (AR5K_INT_RXOK | AR5K_INT_RXERR)) + ath5k_schedule_rx(ah); + + /* TX -> Schedule tx tasklet */ + if (status & (AR5K_INT_TXOK + | AR5K_INT_TXDESC + | AR5K_INT_TXERR + | AR5K_INT_TXEOL)) + ath5k_schedule_tx(ah); + + /* Missed beacon -> TODO + if (status & AR5K_INT_BMISS) + */ + + /* MIB event -> Update counters and notify ANI */ + if (status & AR5K_INT_MIB) { + ah->stats.mib_intr++; + ath5k_hw_update_mib_counters(ah); + ath5k_ani_mib_intr(ah); + } + + /* GPIO -> Notify RFKill layer */ + if (status & AR5K_INT_GPIO) + tasklet_schedule(&ah->rf_kill.toggleq); + + } + + if (ath5k_get_bus_type(ah) == ATH_AHB) + break; + + } while (ath5k_hw_is_intr_pending(ah) && --counter > 0); + + /* + * Until we handle rx/tx interrupts mask them on IMR + * + * NOTE: ah->(rx/tx)_pending are set when scheduling the tasklets + * and unset after we 've handled the interrupts. + */ + if (ah->rx_pending || ah->tx_pending) + ath5k_set_current_imask(ah); + + if (unlikely(!counter)) + ATH5K_WARN(ah, "too many interrupts, giving up for now\n"); + + /* Fire up calibration poll */ + ath5k_intr_calibration_poll(ah); + + return IRQ_HANDLED; +} + +/* + * Periodically recalibrate the PHY to account + * for temperature/environment changes. + */ +static void +ath5k_calibrate_work(struct work_struct *work) +{ + struct ath5k_hw *ah = container_of(work, struct ath5k_hw, + calib_work); + + /* Should we run a full calibration ? */ + if (time_is_before_eq_jiffies(ah->ah_cal_next_full)) { + + ah->ah_cal_next_full = jiffies + + msecs_to_jiffies(ATH5K_TUNE_CALIBRATION_INTERVAL_FULL); + ah->ah_cal_mask |= AR5K_CALIBRATION_FULL; + + ATH5K_DBG(ah, ATH5K_DEBUG_CALIBRATE, + "running full calibration\n"); + + if (ath5k_hw_gainf_calibrate(ah) == AR5K_RFGAIN_NEED_CHANGE) { + /* + * Rfgain is out of bounds, reset the chip + * to load new gain values. + */ + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "got new rfgain, resetting\n"); + ieee80211_queue_work(ah->hw, &ah->reset_work); + } + } else + ah->ah_cal_mask |= AR5K_CALIBRATION_SHORT; + + + ATH5K_DBG(ah, ATH5K_DEBUG_CALIBRATE, "channel %u/%x\n", + ieee80211_frequency_to_channel(ah->curchan->center_freq), + ah->curchan->hw_value); + + if (ath5k_hw_phy_calibrate(ah, ah->curchan)) + ATH5K_ERR(ah, "calibration of channel %u failed\n", + ieee80211_frequency_to_channel( + ah->curchan->center_freq)); + + /* Clear calibration flags */ + if (ah->ah_cal_mask & AR5K_CALIBRATION_FULL) + ah->ah_cal_mask &= ~AR5K_CALIBRATION_FULL; + else if (ah->ah_cal_mask & AR5K_CALIBRATION_SHORT) + ah->ah_cal_mask &= ~AR5K_CALIBRATION_SHORT; +} + + +static void +ath5k_tasklet_ani(struct tasklet_struct *t) +{ + struct ath5k_hw *ah = from_tasklet(ah, t, ani_tasklet); + + ah->ah_cal_mask |= AR5K_CALIBRATION_ANI; + ath5k_ani_calibration(ah); + ah->ah_cal_mask &= ~AR5K_CALIBRATION_ANI; +} + + +static void +ath5k_tx_complete_poll_work(struct work_struct *work) +{ + struct ath5k_hw *ah = container_of(work, struct ath5k_hw, + tx_complete_work.work); + struct ath5k_txq *txq; + int i; + bool needreset = false; + + if (!test_bit(ATH_STAT_STARTED, ah->status)) + return; + + mutex_lock(&ah->lock); + + for (i = 0; i < ARRAY_SIZE(ah->txqs); i++) { + if (ah->txqs[i].setup) { + txq = &ah->txqs[i]; + spin_lock_bh(&txq->lock); + if (txq->txq_len > 1) { + if (txq->txq_poll_mark) { + ATH5K_DBG(ah, ATH5K_DEBUG_XMIT, + "TX queue stuck %d\n", + txq->qnum); + needreset = true; + txq->txq_stuck++; + spin_unlock_bh(&txq->lock); + break; + } else { + txq->txq_poll_mark = true; + } + } + spin_unlock_bh(&txq->lock); + } + } + + if (needreset) { + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "TX queues stuck, resetting\n"); + ath5k_reset(ah, NULL, true); + } + + mutex_unlock(&ah->lock); + + ieee80211_queue_delayed_work(ah->hw, &ah->tx_complete_work, + msecs_to_jiffies(ATH5K_TX_COMPLETE_POLL_INT)); +} + + +/*************************\ +* Initialization routines * +\*************************/ + +static const struct ieee80211_iface_limit if_limits[] = { + { .max = 2048, .types = BIT(NL80211_IFTYPE_STATION) }, + { .max = 4, .types = +#ifdef CONFIG_MAC80211_MESH + BIT(NL80211_IFTYPE_MESH_POINT) | +#endif + BIT(NL80211_IFTYPE_AP) }, +}; + +static const struct ieee80211_iface_combination if_comb = { + .limits = if_limits, + .n_limits = ARRAY_SIZE(if_limits), + .max_interfaces = 2048, + .num_different_channels = 1, +}; + +int +ath5k_init_ah(struct ath5k_hw *ah, const struct ath_bus_ops *bus_ops) +{ + struct ieee80211_hw *hw = ah->hw; + struct ath_common *common; + int ret; + int csz; + + /* Initialize driver private data */ + SET_IEEE80211_DEV(hw, ah->dev); + ieee80211_hw_set(hw, SUPPORTS_RC_TABLE); + ieee80211_hw_set(hw, REPORTS_TX_ACK_STATUS); + ieee80211_hw_set(hw, MFP_CAPABLE); + ieee80211_hw_set(hw, SIGNAL_DBM); + ieee80211_hw_set(hw, RX_INCLUDES_FCS); + ieee80211_hw_set(hw, HOST_BROADCAST_PS_BUFFERING); + + hw->wiphy->interface_modes = + BIT(NL80211_IFTYPE_AP) | + BIT(NL80211_IFTYPE_STATION) | + BIT(NL80211_IFTYPE_ADHOC) | + BIT(NL80211_IFTYPE_MESH_POINT); + + hw->wiphy->iface_combinations = &if_comb; + hw->wiphy->n_iface_combinations = 1; + + /* SW support for IBSS_RSN is provided by mac80211 */ + hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN; + + hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_5_10_MHZ; + + /* both antennas can be configured as RX or TX */ + hw->wiphy->available_antennas_tx = 0x3; + hw->wiphy->available_antennas_rx = 0x3; + + hw->extra_tx_headroom = 2; + + wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST); + + /* + * Mark the device as detached to avoid processing + * interrupts until setup is complete. + */ + __set_bit(ATH_STAT_INVALID, ah->status); + + ah->opmode = NL80211_IFTYPE_STATION; + ah->bintval = 1000; + mutex_init(&ah->lock); + spin_lock_init(&ah->rxbuflock); + spin_lock_init(&ah->txbuflock); + spin_lock_init(&ah->block); + spin_lock_init(&ah->irqlock); + + /* Setup interrupt handler */ + ret = request_irq(ah->irq, ath5k_intr, IRQF_SHARED, "ath", ah); + if (ret) { + ATH5K_ERR(ah, "request_irq failed\n"); + goto err; + } + + common = ath5k_hw_common(ah); + common->ops = &ath5k_common_ops; + common->bus_ops = bus_ops; + common->ah = ah; + common->hw = hw; + common->priv = ah; + common->clockrate = 40; + + /* + * Cache line size is used to size and align various + * structures used to communicate with the hardware. + */ + ath5k_read_cachesize(common, &csz); + common->cachelsz = csz << 2; /* convert to bytes */ + + spin_lock_init(&common->cc_lock); + + /* Initialize device */ + ret = ath5k_hw_init(ah); + if (ret) + goto err_irq; + + /* Set up multi-rate retry capabilities */ + if (ah->ah_capabilities.cap_has_mrr_support) { + hw->max_rates = 4; + hw->max_rate_tries = max(AR5K_INIT_RETRY_SHORT, + AR5K_INIT_RETRY_LONG); + } + + hw->vif_data_size = sizeof(struct ath5k_vif); + + /* Finish private driver data initialization */ + ret = ath5k_init(hw); + if (ret) + goto err_ah; + + ATH5K_INFO(ah, "Atheros AR%s chip found (MAC: 0x%x, PHY: 0x%x)\n", + ath5k_chip_name(AR5K_VERSION_MAC, ah->ah_mac_srev), + ah->ah_mac_srev, + ah->ah_phy_revision); + + if (!ah->ah_single_chip) { + /* Single chip radio (!RF5111) */ + if (ah->ah_radio_5ghz_revision && + !ah->ah_radio_2ghz_revision) { + /* No 5GHz support -> report 2GHz radio */ + if (!test_bit(AR5K_MODE_11A, + ah->ah_capabilities.cap_mode)) { + ATH5K_INFO(ah, "RF%s 2GHz radio found (0x%x)\n", + ath5k_chip_name(AR5K_VERSION_RAD, + ah->ah_radio_5ghz_revision), + ah->ah_radio_5ghz_revision); + /* No 2GHz support (5110 and some + * 5GHz only cards) -> report 5GHz radio */ + } else if (!test_bit(AR5K_MODE_11B, + ah->ah_capabilities.cap_mode)) { + ATH5K_INFO(ah, "RF%s 5GHz radio found (0x%x)\n", + ath5k_chip_name(AR5K_VERSION_RAD, + ah->ah_radio_5ghz_revision), + ah->ah_radio_5ghz_revision); + /* Multiband radio */ + } else { + ATH5K_INFO(ah, "RF%s multiband radio found" + " (0x%x)\n", + ath5k_chip_name(AR5K_VERSION_RAD, + ah->ah_radio_5ghz_revision), + ah->ah_radio_5ghz_revision); + } + } + /* Multi chip radio (RF5111 - RF2111) -> + * report both 2GHz/5GHz radios */ + else if (ah->ah_radio_5ghz_revision && + ah->ah_radio_2ghz_revision) { + ATH5K_INFO(ah, "RF%s 5GHz radio found (0x%x)\n", + ath5k_chip_name(AR5K_VERSION_RAD, + ah->ah_radio_5ghz_revision), + ah->ah_radio_5ghz_revision); + ATH5K_INFO(ah, "RF%s 2GHz radio found (0x%x)\n", + ath5k_chip_name(AR5K_VERSION_RAD, + ah->ah_radio_2ghz_revision), + ah->ah_radio_2ghz_revision); + } + } + + ath5k_debug_init_device(ah); + + /* ready to process interrupts */ + __clear_bit(ATH_STAT_INVALID, ah->status); + + return 0; +err_ah: + ath5k_hw_deinit(ah); +err_irq: + free_irq(ah->irq, ah); +err: + return ret; +} + +static int +ath5k_stop_locked(struct ath5k_hw *ah) +{ + + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, "invalid %u\n", + test_bit(ATH_STAT_INVALID, ah->status)); + + /* + * Shutdown the hardware and driver: + * stop output from above + * disable interrupts + * turn off timers + * turn off the radio + * clear transmit machinery + * clear receive machinery + * drain and release tx queues + * reclaim beacon resources + * power down hardware + * + * Note that some of this work is not possible if the + * hardware is gone (invalid). + */ + ieee80211_stop_queues(ah->hw); + + if (!test_bit(ATH_STAT_INVALID, ah->status)) { + ath5k_led_off(ah); + ath5k_hw_set_imr(ah, 0); + synchronize_irq(ah->irq); + ath5k_rx_stop(ah); + ath5k_hw_dma_stop(ah); + ath5k_drain_tx_buffs(ah); + ath5k_hw_phy_disable(ah); + } + + return 0; +} + +int ath5k_start(struct ieee80211_hw *hw) +{ + struct ath5k_hw *ah = hw->priv; + struct ath_common *common = ath5k_hw_common(ah); + int ret, i; + + mutex_lock(&ah->lock); + + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, "mode %d\n", ah->opmode); + + /* + * Stop anything previously setup. This is safe + * no matter this is the first time through or not. + */ + ath5k_stop_locked(ah); + + /* + * The basic interface to setting the hardware in a good + * state is ``reset''. On return the hardware is known to + * be powered up and with interrupts disabled. This must + * be followed by initialization of the appropriate bits + * and then setup of the interrupt mask. + */ + ah->curchan = ah->hw->conf.chandef.chan; + ah->imask = AR5K_INT_RXOK + | AR5K_INT_RXERR + | AR5K_INT_RXEOL + | AR5K_INT_RXORN + | AR5K_INT_TXDESC + | AR5K_INT_TXEOL + | AR5K_INT_FATAL + | AR5K_INT_GLOBAL + | AR5K_INT_MIB; + + ret = ath5k_reset(ah, NULL, false); + if (ret) + goto done; + + if (!ath5k_modparam_no_hw_rfkill_switch) + ath5k_rfkill_hw_start(ah); + + /* + * Reset the key cache since some parts do not reset the + * contents on initial power up or resume from suspend. + */ + for (i = 0; i < common->keymax; i++) + ath_hw_keyreset(common, (u16) i); + + /* Use higher rates for acks instead of base + * rate */ + ah->ah_ack_bitrate_high = true; + + for (i = 0; i < ARRAY_SIZE(ah->bslot); i++) + ah->bslot[i] = NULL; + + ret = 0; +done: + mutex_unlock(&ah->lock); + + set_bit(ATH_STAT_STARTED, ah->status); + ieee80211_queue_delayed_work(ah->hw, &ah->tx_complete_work, + msecs_to_jiffies(ATH5K_TX_COMPLETE_POLL_INT)); + + return ret; +} + +static void ath5k_stop_tasklets(struct ath5k_hw *ah) +{ + ah->rx_pending = false; + ah->tx_pending = false; + tasklet_kill(&ah->rxtq); + tasklet_kill(&ah->txtq); + tasklet_kill(&ah->beacontq); + tasklet_kill(&ah->ani_tasklet); +} + +/* + * Stop the device, grabbing the top-level lock to protect + * against concurrent entry through ath5k_init (which can happen + * if another thread does a system call and the thread doing the + * stop is preempted). + */ +void ath5k_stop(struct ieee80211_hw *hw) +{ + struct ath5k_hw *ah = hw->priv; + int ret; + + mutex_lock(&ah->lock); + ret = ath5k_stop_locked(ah); + if (ret == 0 && !test_bit(ATH_STAT_INVALID, ah->status)) { + /* + * Don't set the card in full sleep mode! + * + * a) When the device is in this state it must be carefully + * woken up or references to registers in the PCI clock + * domain may freeze the bus (and system). This varies + * by chip and is mostly an issue with newer parts + * (madwifi sources mentioned srev >= 0x78) that go to + * sleep more quickly. + * + * b) On older chips full sleep results a weird behaviour + * during wakeup. I tested various cards with srev < 0x78 + * and they don't wake up after module reload, a second + * module reload is needed to bring the card up again. + * + * Until we figure out what's going on don't enable + * full chip reset on any chip (this is what Legacy HAL + * and Sam's HAL do anyway). Instead Perform a full reset + * on the device (same as initial state after attach) and + * leave it idle (keep MAC/BB on warm reset) */ + ret = ath5k_hw_on_hold(ah); + + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "putting device to sleep\n"); + } + + mutex_unlock(&ah->lock); + + ath5k_stop_tasklets(ah); + + clear_bit(ATH_STAT_STARTED, ah->status); + cancel_delayed_work_sync(&ah->tx_complete_work); + + if (!ath5k_modparam_no_hw_rfkill_switch) + ath5k_rfkill_hw_stop(ah); +} + +/* + * Reset the hardware. If chan is not NULL, then also pause rx/tx + * and change to the given channel. + * + * This should be called with ah->lock. + */ +static int +ath5k_reset(struct ath5k_hw *ah, struct ieee80211_channel *chan, + bool skip_pcu) +{ + struct ath_common *common = ath5k_hw_common(ah); + int ret, ani_mode; + bool fast = chan && modparam_fastchanswitch ? 1 : 0; + + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, "resetting\n"); + + __set_bit(ATH_STAT_RESET, ah->status); + + ath5k_hw_set_imr(ah, 0); + synchronize_irq(ah->irq); + ath5k_stop_tasklets(ah); + + /* Save ani mode and disable ANI during + * reset. If we don't we might get false + * PHY error interrupts. */ + ani_mode = ah->ani_state.ani_mode; + ath5k_ani_init(ah, ATH5K_ANI_MODE_OFF); + + /* We are going to empty hw queues + * so we should also free any remaining + * tx buffers */ + ath5k_drain_tx_buffs(ah); + + /* Stop PCU */ + ath5k_hw_stop_rx_pcu(ah); + + /* Stop DMA + * + * Note: If DMA didn't stop continue + * since only a reset will fix it. + */ + ret = ath5k_hw_dma_stop(ah); + + /* RF Bus grant won't work if we have pending + * frames + */ + if (ret && fast) { + ATH5K_DBG(ah, ATH5K_DEBUG_RESET, + "DMA didn't stop, falling back to normal reset\n"); + fast = false; + } + + if (chan) + ah->curchan = chan; + + ret = ath5k_hw_reset(ah, ah->opmode, ah->curchan, fast, skip_pcu); + if (ret) { + ATH5K_ERR(ah, "can't reset hardware (%d)\n", ret); + goto err; + } + + ret = ath5k_rx_start(ah); + if (ret) { + ATH5K_ERR(ah, "can't start recv logic\n"); + goto err; + } + + ath5k_ani_init(ah, ani_mode); + + /* + * Set calibration intervals + * + * Note: We don't need to run calibration imediately + * since some initial calibration is done on reset + * even for fast channel switching. Also on scanning + * this will get set again and again and it won't get + * executed unless we connect somewhere and spend some + * time on the channel (that's what calibration needs + * anyway to be accurate). + */ + ah->ah_cal_next_full = jiffies + + msecs_to_jiffies(ATH5K_TUNE_CALIBRATION_INTERVAL_FULL); + ah->ah_cal_next_ani = jiffies + + msecs_to_jiffies(ATH5K_TUNE_CALIBRATION_INTERVAL_ANI); + ah->ah_cal_next_short = jiffies + + msecs_to_jiffies(ATH5K_TUNE_CALIBRATION_INTERVAL_SHORT); + + ewma_beacon_rssi_init(&ah->ah_beacon_rssi_avg); + + /* clear survey data and cycle counters */ + memset(&ah->survey, 0, sizeof(ah->survey)); + spin_lock_bh(&common->cc_lock); + ath_hw_cycle_counters_update(common); + memset(&common->cc_survey, 0, sizeof(common->cc_survey)); + memset(&common->cc_ani, 0, sizeof(common->cc_ani)); + spin_unlock_bh(&common->cc_lock); + + /* + * Change channels and update the h/w rate map if we're switching; + * e.g. 11a to 11b/g. + * + * We may be doing a reset in response to an ioctl that changes the + * channel so update any state that might change as a result. + * + * XXX needed? + */ +/* ath5k_chan_change(ah, c); */ + + __clear_bit(ATH_STAT_RESET, ah->status); + + ath5k_beacon_config(ah); + /* intrs are enabled by ath5k_beacon_config */ + + ieee80211_wake_queues(ah->hw); + + return 0; +err: + return ret; +} + +static void ath5k_reset_work(struct work_struct *work) +{ + struct ath5k_hw *ah = container_of(work, struct ath5k_hw, + reset_work); + + mutex_lock(&ah->lock); + ath5k_reset(ah, NULL, true); + mutex_unlock(&ah->lock); +} + +static int +ath5k_init(struct ieee80211_hw *hw) +{ + + struct ath5k_hw *ah = hw->priv; + struct ath_regulatory *regulatory = ath5k_hw_regulatory(ah); + struct ath5k_txq *txq; + u8 mac[ETH_ALEN] = {}; + int ret; + + + /* + * Collect the channel list. The 802.11 layer + * is responsible for filtering this list based + * on settings like the phy mode and regulatory + * domain restrictions. + */ + ret = ath5k_setup_bands(hw); + if (ret) { + ATH5K_ERR(ah, "can't get channels\n"); + goto err; + } + + /* + * Allocate tx+rx descriptors and populate the lists. + */ + ret = ath5k_desc_alloc(ah); + if (ret) { + ATH5K_ERR(ah, "can't allocate descriptors\n"); + goto err; + } + + /* + * Allocate hardware transmit queues: one queue for + * beacon frames and one data queue for each QoS + * priority. Note that hw functions handle resetting + * these queues at the needed time. + */ + ret = ath5k_beaconq_setup(ah); + if (ret < 0) { + ATH5K_ERR(ah, "can't setup a beacon xmit queue\n"); + goto err_desc; + } + ah->bhalq = ret; + ah->cabq = ath5k_txq_setup(ah, AR5K_TX_QUEUE_CAB, 0); + if (IS_ERR(ah->cabq)) { + ATH5K_ERR(ah, "can't setup cab queue\n"); + ret = PTR_ERR(ah->cabq); + goto err_bhal; + } + + /* 5211 and 5212 usually support 10 queues but we better rely on the + * capability information */ + if (ah->ah_capabilities.cap_queues.q_tx_num >= 6) { + /* This order matches mac80211's queue priority, so we can + * directly use the mac80211 queue number without any mapping */ + txq = ath5k_txq_setup(ah, AR5K_TX_QUEUE_DATA, AR5K_WME_AC_VO); + if (IS_ERR(txq)) { + ATH5K_ERR(ah, "can't setup xmit queue\n"); + ret = PTR_ERR(txq); + goto err_queues; + } + txq = ath5k_txq_setup(ah, AR5K_TX_QUEUE_DATA, AR5K_WME_AC_VI); + if (IS_ERR(txq)) { + ATH5K_ERR(ah, "can't setup xmit queue\n"); + ret = PTR_ERR(txq); + goto err_queues; + } + txq = ath5k_txq_setup(ah, AR5K_TX_QUEUE_DATA, AR5K_WME_AC_BE); + if (IS_ERR(txq)) { + ATH5K_ERR(ah, "can't setup xmit queue\n"); + ret = PTR_ERR(txq); + goto err_queues; + } + txq = ath5k_txq_setup(ah, AR5K_TX_QUEUE_DATA, AR5K_WME_AC_BK); + if (IS_ERR(txq)) { + ATH5K_ERR(ah, "can't setup xmit queue\n"); + ret = PTR_ERR(txq); + goto err_queues; + } + hw->queues = 4; + } else { + /* older hardware (5210) can only support one data queue */ + txq = ath5k_txq_setup(ah, AR5K_TX_QUEUE_DATA, AR5K_WME_AC_BE); + if (IS_ERR(txq)) { + ATH5K_ERR(ah, "can't setup xmit queue\n"); + ret = PTR_ERR(txq); + goto err_queues; + } + hw->queues = 1; + } + + tasklet_setup(&ah->rxtq, ath5k_tasklet_rx); + tasklet_setup(&ah->txtq, ath5k_tasklet_tx); + tasklet_setup(&ah->beacontq, ath5k_tasklet_beacon); + tasklet_setup(&ah->ani_tasklet, ath5k_tasklet_ani); + + INIT_WORK(&ah->reset_work, ath5k_reset_work); + INIT_WORK(&ah->calib_work, ath5k_calibrate_work); + INIT_DELAYED_WORK(&ah->tx_complete_work, ath5k_tx_complete_poll_work); + + ret = ath5k_hw_common(ah)->bus_ops->eeprom_read_mac(ah, mac); + if (ret) { + ATH5K_ERR(ah, "unable to read address from EEPROM\n"); + goto err_queues; + } + + SET_IEEE80211_PERM_ADDR(hw, mac); + /* All MAC address bits matter for ACKs */ + ath5k_update_bssid_mask_and_opmode(ah, NULL); + + regulatory->current_rd = ah->ah_capabilities.cap_eeprom.ee_regdomain; + ret = ath_regd_init(regulatory, hw->wiphy, ath5k_reg_notifier); + if (ret) { + ATH5K_ERR(ah, "can't initialize regulatory system\n"); + goto err_queues; + } + + ret = ieee80211_register_hw(hw); + if (ret) { + ATH5K_ERR(ah, "can't register ieee80211 hw\n"); + goto err_queues; + } + + if (!ath_is_world_regd(regulatory)) + regulatory_hint(hw->wiphy, regulatory->alpha2); + + ath5k_init_leds(ah); + + ath5k_sysfs_register(ah); + + return 0; +err_queues: + ath5k_txq_release(ah); +err_bhal: + ath5k_hw_release_tx_queue(ah, ah->bhalq); +err_desc: + ath5k_desc_free(ah); +err: + return ret; +} + +void +ath5k_deinit_ah(struct ath5k_hw *ah) +{ + struct ieee80211_hw *hw = ah->hw; + + /* + * NB: the order of these is important: + * o call the 802.11 layer before detaching ath5k_hw to + * ensure callbacks into the driver to delete global + * key cache entries can be handled + * o reclaim the tx queue data structures after calling + * the 802.11 layer as we'll get called back to reclaim + * node state and potentially want to use them + * o to cleanup the tx queues the hal is called, so detach + * it last + * XXX: ??? detach ath5k_hw ??? + * Other than that, it's straightforward... + */ + ieee80211_unregister_hw(hw); + ath5k_desc_free(ah); + ath5k_txq_release(ah); + ath5k_hw_release_tx_queue(ah, ah->bhalq); + ath5k_unregister_leds(ah); + + ath5k_sysfs_unregister(ah); + /* + * NB: can't reclaim these until after ieee80211_ifdetach + * returns because we'll get called back to reclaim node + * state and potentially want to use them. + */ + ath5k_hw_deinit(ah); + free_irq(ah->irq, ah); +} + +bool +ath5k_any_vif_assoc(struct ath5k_hw *ah) +{ + struct ath5k_vif_iter_data iter_data; + iter_data.hw_macaddr = NULL; + iter_data.any_assoc = false; + iter_data.need_set_hw_addr = false; + iter_data.found_active = true; + + ieee80211_iterate_active_interfaces_atomic( + ah->hw, IEEE80211_IFACE_ITER_RESUME_ALL, + ath5k_vif_iter, &iter_data); + return iter_data.any_assoc; +} + +void +ath5k_set_beacon_filter(struct ieee80211_hw *hw, bool enable) +{ + struct ath5k_hw *ah = hw->priv; + u32 rfilt; + rfilt = ath5k_hw_get_rx_filter(ah); + if (enable) + rfilt |= AR5K_RX_FILTER_BEACON; + else + rfilt &= ~AR5K_RX_FILTER_BEACON; + ath5k_hw_set_rx_filter(ah, rfilt); + ah->filter_flags = rfilt; +} + +void _ath5k_printk(const struct ath5k_hw *ah, const char *level, + const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + if (ah && ah->hw) + printk("%s" pr_fmt("%s: %pV"), + level, wiphy_name(ah->hw->wiphy), &vaf); + else + printk("%s" pr_fmt("%pV"), level, &vaf); + + va_end(args); +} |