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 000000000000..ff221258b941
--- /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;
+		}
+}