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path: root/drivers/net/wireless/wl12xx/wl1271_tx.c
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Diffstat (limited to 'drivers/net/wireless/wl12xx/wl1271_tx.c')
-rw-r--r--drivers/net/wireless/wl12xx/wl1271_tx.c378
1 files changed, 378 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/wl1271_tx.c b/drivers/net/wireless/wl12xx/wl1271_tx.c
new file mode 100644
index 00000000000..ff221258b94
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/wl1271_tx.c
@@ -0,0 +1,378 @@
+/*
+ * 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/kernel.h>
+#include <linux/module.h>
+
+#include "wl1271.h"
+#include "wl1271_spi.h"
+#include "wl1271_reg.h"
+#include "wl1271_ps.h"
+#include "wl1271_tx.h"
+
+static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb)
+{
+ int i;
+
+ for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
+ if (wl->tx_frames[i] == NULL) {
+ wl->tx_frames[i] = skb;
+ return i;
+ }
+
+ return -EBUSY;
+}
+
+static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra)
+{
+ struct wl1271_tx_hw_descr *desc;
+ u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
+ u32 total_blocks, excluded;
+ int id, ret = -EBUSY;
+
+ /* allocate free identifier for the packet */
+ id = wl1271_tx_id(wl, skb);
+ if (id < 0)
+ return id;
+
+ /* approximate the number of blocks required for this packet
+ in the firmware */
+ /* FIXME: try to figure out what is done here and make it cleaner */
+ total_blocks = (skb->len) >> TX_HW_BLOCK_SHIFT_DIV;
+ excluded = (total_blocks << 2) + (skb->len & 0xff) + 34;
+ total_blocks += (excluded > 252) ? 2 : 1;
+ total_blocks += TX_HW_BLOCK_SPARE;
+
+ if (total_blocks <= wl->tx_blocks_available) {
+ desc = (struct wl1271_tx_hw_descr *)skb_push(
+ skb, total_len - skb->len);
+
+ desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
+ desc->total_mem_blocks = total_blocks;
+ desc->id = id;
+
+ wl->tx_blocks_available -= total_blocks;
+
+ ret = 0;
+
+ wl1271_debug(DEBUG_TX,
+ "tx_allocate: size: %d, blocks: %d, id: %d",
+ total_len, total_blocks, id);
+ } else
+ wl->tx_frames[id] = NULL;
+
+ return ret;
+}
+
+static int wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
+ u32 extra, struct ieee80211_tx_info *control)
+{
+ struct wl1271_tx_hw_descr *desc;
+ int pad;
+
+ desc = (struct wl1271_tx_hw_descr *) skb->data;
+
+ /* configure packet life time */
+ desc->start_time = jiffies_to_usecs(jiffies) - wl->time_offset;
+ desc->life_time = TX_HW_MGMT_PKT_LIFETIME_TU;
+
+ /* configure the tx attributes */
+ desc->tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
+ /* FIXME: do we know the packet priority? can we identify mgmt
+ packets, and use max prio for them at least? */
+ desc->tid = 0;
+ desc->aid = TX_HW_DEFAULT_AID;
+ desc->reserved = 0;
+
+ /* align the length (and store in terms of words) */
+ pad = WL1271_TX_ALIGN(skb->len);
+ desc->length = pad >> 2;
+
+ /* calculate number of padding bytes */
+ pad = pad - skb->len;
+ desc->tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
+
+ wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
+ return 0;
+}
+
+static int wl1271_tx_send_packet(struct wl1271 *wl, struct sk_buff *skb,
+ struct ieee80211_tx_info *control)
+{
+
+ struct wl1271_tx_hw_descr *desc;
+ int len;
+
+ /* FIXME: This is a workaround for getting non-aligned packets.
+ This happens at least with EAPOL packets from the user space.
+ Our DMA requires packets to be aligned on a 4-byte boundary.
+ */
+ if (unlikely((long)skb->data & 0x03)) {
+ int offset = (4 - (long)skb->data) & 0x03;
+ wl1271_debug(DEBUG_TX, "skb offset %d", offset);
+
+ /* check whether the current skb can be used */
+ if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
+ unsigned char *src = skb->data;
+
+ /* align the buffer on a 4-byte boundary */
+ skb_reserve(skb, offset);
+ memmove(skb->data, src, skb->len);
+ } else {
+ wl1271_info("No handler, fixme!");
+ return -EINVAL;
+ }
+ }
+
+ len = WL1271_TX_ALIGN(skb->len);
+
+ /* perform a fixed address block write with the packet */
+ wl1271_spi_reg_write(wl, WL1271_SLV_MEM_DATA, skb->data, len, true);
+
+ /* write packet new counter into the write access register */
+ wl->tx_packets_count++;
+ wl1271_reg_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
+
+ desc = (struct wl1271_tx_hw_descr *) skb->data;
+ wl1271_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u (%u words)",
+ desc->id, skb, len, desc->length);
+
+ return 0;
+}
+
+/* caller must hold wl->mutex */
+static int wl1271_tx_frame(struct wl1271 *wl, struct sk_buff *skb)
+{
+ struct ieee80211_tx_info *info;
+ u32 extra = 0;
+ int ret = 0;
+ u8 idx;
+
+ if (!skb)
+ return -EINVAL;
+
+ info = IEEE80211_SKB_CB(skb);
+
+ if (info->control.hw_key &&
+ info->control.hw_key->alg == ALG_TKIP)
+ extra = WL1271_TKIP_IV_SPACE;
+
+ if (info->control.hw_key) {
+ idx = info->control.hw_key->hw_key_idx;
+
+ /* FIXME: do we have to do this if we're not using WEP? */
+ if (unlikely(wl->default_key != idx)) {
+ ret = wl1271_cmd_set_default_wep_key(wl, idx);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ ret = wl1271_tx_allocate(wl, skb, extra);
+ if (ret < 0)
+ return ret;
+
+ ret = wl1271_tx_fill_hdr(wl, skb, extra, info);
+ if (ret < 0)
+ return ret;
+
+ ret = wl1271_tx_send_packet(wl, skb, info);
+ if (ret < 0)
+ return ret;
+
+ return ret;
+}
+
+void wl1271_tx_work(struct work_struct *work)
+{
+ struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
+ struct sk_buff *skb;
+ bool woken_up = false;
+ int ret;
+
+ mutex_lock(&wl->mutex);
+
+ if (unlikely(wl->state == WL1271_STATE_OFF))
+ goto out;
+
+ while ((skb = skb_dequeue(&wl->tx_queue))) {
+ if (!woken_up) {
+ ret = wl1271_ps_elp_wakeup(wl, false);
+ if (ret < 0)
+ goto out;
+ woken_up = true;
+ }
+
+ ret = wl1271_tx_frame(wl, skb);
+ if (ret == -EBUSY) {
+ /* firmware buffer is full, stop queues */
+ wl1271_debug(DEBUG_TX, "tx_work: fw buffer full, "
+ "stop queues");
+ ieee80211_stop_queues(wl->hw);
+ wl->tx_queue_stopped = true;
+ skb_queue_head(&wl->tx_queue, skb);
+ goto out;
+ } else if (ret < 0) {
+ dev_kfree_skb(skb);
+ goto out;
+ } else if (wl->tx_queue_stopped) {
+ /* firmware buffer has space, restart queues */
+ wl1271_debug(DEBUG_TX,
+ "complete_packet: waking queues");
+ ieee80211_wake_queues(wl->hw);
+ wl->tx_queue_stopped = false;
+ }
+ }
+
+out:
+ if (woken_up)
+ wl1271_ps_elp_sleep(wl);
+
+ mutex_unlock(&wl->mutex);
+}
+
+static void wl1271_tx_complete_packet(struct wl1271 *wl,
+ struct wl1271_tx_hw_res_descr *result)
+{
+
+ struct ieee80211_tx_info *info;
+ struct sk_buff *skb;
+ u32 header_len;
+ int id = result->id;
+
+ /* check for id legality */
+ if (id >= TX_HW_RESULT_QUEUE_LEN || wl->tx_frames[id] == NULL) {
+ wl1271_warning("TX result illegal id: %d", id);
+ return;
+ }
+
+ skb = wl->tx_frames[id];
+ info = IEEE80211_SKB_CB(skb);
+
+ /* update packet status */
+ if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
+ if (result->status == TX_SUCCESS)
+ info->flags |= IEEE80211_TX_STAT_ACK;
+ if (result->status & TX_RETRY_EXCEEDED) {
+ /* FIXME */
+ /* info->status.excessive_retries = 1; */
+ wl->stats.excessive_retries++;
+ }
+ }
+
+ /* FIXME */
+ /* info->status.retry_count = result->ack_failures; */
+ wl->stats.retry_count += result->ack_failures;
+
+ /* get header len */
+ if (info->control.hw_key &&
+ info->control.hw_key->alg == ALG_TKIP)
+ header_len = WL1271_TKIP_IV_SPACE +
+ sizeof(struct wl1271_tx_hw_descr);
+ else
+ header_len = sizeof(struct wl1271_tx_hw_descr);
+
+ wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
+ " status 0x%x",
+ result->id, skb, result->ack_failures,
+ result->rate_class_index, result->status);
+
+ /* remove private header from packet */
+ skb_pull(skb, header_len);
+
+ /* return the packet to the stack */
+ ieee80211_tx_status(wl->hw, skb);
+ wl->tx_frames[result->id] = NULL;
+}
+
+/* Called upon reception of a TX complete interrupt */
+void wl1271_tx_complete(struct wl1271 *wl, u32 count)
+{
+ struct wl1271_acx_mem_map *memmap =
+ (struct wl1271_acx_mem_map *)wl->target_mem_map;
+ u32 i;
+
+ wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
+
+ /* read the tx results from the chipset */
+ wl1271_spi_mem_read(wl, memmap->tx_result,
+ wl->tx_res_if, sizeof(*wl->tx_res_if));
+
+ /* verify that the result buffer is not getting overrun */
+ if (count > TX_HW_RESULT_QUEUE_LEN) {
+ wl1271_warning("TX result overflow from chipset: %d", count);
+ count = TX_HW_RESULT_QUEUE_LEN;
+ }
+
+ /* process the results */
+ for (i = 0; i < count; i++) {
+ struct wl1271_tx_hw_res_descr *result;
+ u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
+
+ /* process the packet */
+ result = &(wl->tx_res_if->tx_results_queue[offset]);
+ wl1271_tx_complete_packet(wl, result);
+
+ wl->tx_results_count++;
+ }
+
+ /* write host counter to chipset (to ack) */
+ wl1271_mem_write32(wl, memmap->tx_result +
+ offsetof(struct wl1271_tx_hw_res_if,
+ tx_result_host_counter),
+ wl->tx_res_if->tx_result_fw_counter);
+}
+
+/* caller must hold wl->mutex */
+void wl1271_tx_flush(struct wl1271 *wl)
+{
+ int i;
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *info;
+
+ /* TX failure */
+/* control->flags = 0; FIXME */
+
+ while ((skb = skb_dequeue(&wl->tx_queue))) {
+ info = IEEE80211_SKB_CB(skb);
+
+ wl1271_debug(DEBUG_TX, "flushing skb 0x%p", skb);
+
+ if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
+ continue;
+
+ ieee80211_tx_status(wl->hw, skb);
+ }
+
+ for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
+ if (wl->tx_frames[i] != NULL) {
+ skb = wl->tx_frames[i];
+ info = IEEE80211_SKB_CB(skb);
+
+ if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
+ continue;
+
+ ieee80211_tx_status(wl->hw, skb);
+ wl->tx_frames[i] = NULL;
+ }
+}