diff options
Diffstat (limited to 'drivers/net/wireless/ti/wlcore/rx.c')
| -rw-r--r-- | drivers/net/wireless/ti/wlcore/rx.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/drivers/net/wireless/ti/wlcore/rx.c b/drivers/net/wireless/ti/wlcore/rx.c new file mode 100644 index 0000000..0f15696 --- /dev/null +++ b/drivers/net/wireless/ti/wlcore/rx.c @@ -0,0 +1,352 @@ +/* + * This file is part of wl1271 + * + * Copyright (C) 2009 Nokia Corporation + * + * Contact: Luciano Coelho <luciano.coelho@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#include <linux/gfp.h> +#include <linux/sched.h> + +#include "wlcore.h" +#include "debug.h" +#include "acx.h" +#include "rx.h" +#include "tx.h" +#include "io.h" +#include "hw_ops.h" + +/* + * TODO: this is here just for now, it must be removed when the data + * operations are in place. + */ +#include "../wl12xx/reg.h" + +static u32 wlcore_rx_get_buf_size(struct wl1271 *wl, + u32 rx_pkt_desc) +{ + if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) + return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >> + ALIGNED_RX_BUF_SIZE_SHIFT; + + return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; +} + +static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len) +{ + if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) + return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE); + + return pkt_len; +} + +static void wl1271_rx_status(struct wl1271 *wl, + struct wl1271_rx_descriptor *desc, + struct ieee80211_rx_status *status, + u8 beacon) +{ + memset(status, 0, sizeof(struct ieee80211_rx_status)); + + if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) + status->band = NL80211_BAND_2GHZ; + else + status->band = NL80211_BAND_5GHZ; + + status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band); + + /* 11n support */ + if (desc->rate <= wl->hw_min_ht_rate) + status->encoding = RX_ENC_HT; + + /* + * Read the signal level and antenna diversity indication. + * The msb in the signal level is always set as it is a + * negative number. + * The antenna indication is the msb of the rssi. + */ + status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7)); + status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7); + + /* + * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we + * need to divide by two for now, but TI has been discussing about + * changing it. This needs to be rechecked. + */ + wl->noise = desc->rssi - (desc->snr >> 1); + + status->freq = ieee80211_channel_to_frequency(desc->channel, + status->band); + + if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { + u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; + + status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | + RX_FLAG_DECRYPTED; + + if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) { + status->flag |= RX_FLAG_MMIC_ERROR; + wl1271_warning("Michael MIC error. Desc: 0x%x", + desc_err_code); + } + } + + if (beacon) + wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel, + status->band); +} + +static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, + enum wl_rx_buf_align rx_align, u8 *hlid) +{ + struct wl1271_rx_descriptor *desc; + struct sk_buff *skb; + struct ieee80211_hdr *hdr; + u8 beacon = 0; + u8 is_data = 0; + u8 reserved = 0, offset_to_data = 0; + u16 seq_num; + u32 pkt_data_len; + + /* + * In PLT mode we seem to get frames and mac80211 warns about them, + * workaround this by not retrieving them at all. + */ + if (unlikely(wl->plt)) + return -EINVAL; + + pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length); + if (!pkt_data_len) { + wl1271_error("Invalid packet arrived from HW. length %d", + length); + return -EINVAL; + } + + if (rx_align == WLCORE_RX_BUF_UNALIGNED) + reserved = RX_BUF_ALIGN; + else if (rx_align == WLCORE_RX_BUF_PADDED) + offset_to_data = RX_BUF_ALIGN; + + /* the data read starts with the descriptor */ + desc = (struct wl1271_rx_descriptor *) data; + + if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { + size_t len = length - sizeof(*desc); + wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); + return 0; + } + + /* discard corrupted packets */ + if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) { + hdr = (void *)(data + sizeof(*desc) + offset_to_data); + wl1271_warning("corrupted packet in RX: status: 0x%x len: %d", + desc->status & WL1271_RX_DESC_STATUS_MASK, + pkt_data_len); + wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc), + min(pkt_data_len, + ieee80211_hdrlen(hdr->frame_control))); + return -EINVAL; + } + + /* skb length not including rx descriptor */ + skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); + if (!skb) { + wl1271_error("Couldn't allocate RX frame"); + return -ENOMEM; + } + + /* reserve the unaligned payload(if any) */ + skb_reserve(skb, reserved); + + /* + * Copy packets from aggregation buffer to the skbs without rx + * descriptor and with packet payload aligned care. In case of unaligned + * packets copy the packets in offset of 2 bytes guarantee IP header + * payload aligned to 4 bytes. + */ + skb_put_data(skb, data + sizeof(*desc), pkt_data_len); + if (rx_align == WLCORE_RX_BUF_PADDED) + skb_pull(skb, RX_BUF_ALIGN); + + *hlid = desc->hlid; + + hdr = (struct ieee80211_hdr *)skb->data; + if (ieee80211_is_beacon(hdr->frame_control)) + beacon = 1; + if (ieee80211_is_data_present(hdr->frame_control)) + is_data = 1; + + wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); + wlcore_hw_set_rx_csum(wl, desc, skb); + + seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; + wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, + skb->len - desc->pad_len, + beacon ? "beacon" : "", + seq_num, *hlid); + + skb_queue_tail(&wl->deferred_rx_queue, skb); + queue_work(wl->freezable_wq, &wl->netstack_work); + + return is_data; +} + +int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status) +{ + unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0}; + u32 buf_size; + u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc; + u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc; + u32 rx_counter; + u32 pkt_len, align_pkt_len; + u32 pkt_offset, des; + u8 hlid; + enum wl_rx_buf_align rx_align; + int ret = 0; + + /* update rates per link */ + hlid = status->counters.hlid; + + if (hlid < WLCORE_MAX_LINKS) + wl->links[hlid].fw_rate_mbps = + status->counters.tx_last_rate_mbps; + + while (drv_rx_counter != fw_rx_counter) { + buf_size = 0; + rx_counter = drv_rx_counter; + while (rx_counter != fw_rx_counter) { + des = le32_to_cpu(status->rx_pkt_descs[rx_counter]); + pkt_len = wlcore_rx_get_buf_size(wl, des); + align_pkt_len = wlcore_rx_get_align_buf_size(wl, + pkt_len); + if (buf_size + align_pkt_len > wl->aggr_buf_size) + break; + buf_size += align_pkt_len; + rx_counter++; + rx_counter %= wl->num_rx_desc; + } + + if (buf_size == 0) { + wl1271_warning("received empty data"); + break; + } + + /* Read all available packets at once */ + des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); + ret = wlcore_hw_prepare_read(wl, des, buf_size); + if (ret < 0) + goto out; + + ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, + buf_size, true); + if (ret < 0) + goto out; + + /* Split data into separate packets */ + pkt_offset = 0; + while (pkt_offset < buf_size) { + des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); + pkt_len = wlcore_rx_get_buf_size(wl, des); + rx_align = wlcore_hw_get_rx_buf_align(wl, des); + + /* + * the handle data call can only fail in memory-outage + * conditions, in that case the received frame will just + * be dropped. + */ + if (wl1271_rx_handle_data(wl, + wl->aggr_buf + pkt_offset, + pkt_len, rx_align, + &hlid) == 1) { + if (hlid < wl->num_links) + __set_bit(hlid, active_hlids); + else + WARN(1, + "hlid (%d) exceeded MAX_LINKS\n", + hlid); + } + + wl->rx_counter++; + drv_rx_counter++; + drv_rx_counter %= wl->num_rx_desc; + pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len); + } + } + + /* + * Write the driver's packet counter to the FW. This is only required + * for older hardware revisions + */ + if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) { + ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER, + wl->rx_counter); + if (ret < 0) + goto out; + } + + wl12xx_rearm_rx_streaming(wl, active_hlids); + +out: + return ret; +} + +#ifdef CONFIG_PM +int wl1271_rx_filter_enable(struct wl1271 *wl, + int index, bool enable, + struct wl12xx_rx_filter *filter) +{ + int ret; + + if (!!test_bit(index, wl->rx_filter_enabled) == enable) { + wl1271_warning("Request to enable an already " + "enabled rx filter %d", index); + return 0; + } + + ret = wl1271_acx_set_rx_filter(wl, index, enable, filter); + + if (ret) { + wl1271_error("Failed to %s rx data filter %d (err=%d)", + enable ? "enable" : "disable", index, ret); + return ret; + } + + if (enable) + __set_bit(index, wl->rx_filter_enabled); + else + __clear_bit(index, wl->rx_filter_enabled); + + return 0; +} + +int wl1271_rx_filter_clear_all(struct wl1271 *wl) +{ + int i, ret = 0; + + for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) { + if (!test_bit(i, wl->rx_filter_enabled)) + continue; + ret = wl1271_rx_filter_enable(wl, i, 0, NULL); + if (ret) + goto out; + } + +out: + return ret; +} +#endif /* CONFIG_PM */ |