wl1251: move to it's own directory

wl1271 driver is under heavy development but on the other hand the older
wl1251 driver is currently considered more as a legacy driver. To make it
easier to develop wl1271 features move wl1251 to it's own directory,
drivers/net/wireless/wl1251.

There are no functional changes, only moving of files. One regression
is that Kconfig won't be updated automatically and user needs to enable
wl1251 manually with an older config file.

Signed-off-by: Kalle Valo <kvalo@adurom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 570 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl1251/tx.c b/drivers/net/wireless/wl1251/tx.c
new file mode 100644
index 000000000000..554b4f9a3d3e
--- /dev/null
+++ b/drivers/net/wireless/wl1251/tx.c
@@ -0,0 +1,570 @@
+/*
+ * This file is part of wl1251
+ *
+ * Copyright (c) 1998-2007 Texas Instruments Incorporated
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * 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 "wl1251.h"
+#include "reg.h"
+#include "tx.h"
+#include "ps.h"
+#include "io.h"
+
+static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
+{
+        int used, data_in_count;
+
+        data_in_count = wl->data_in_count;
+
+        if (data_in_count < data_out_count)
+                /* data_in_count has wrapped */
+                data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1;
+
+        used = data_in_count - data_out_count;
+
+        WARN_ON(used < 0);
+        WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM);
+
+        if (used >= DP_TX_PACKET_RING_CHUNK_NUM)
+                return true;
+        else
+                return false;
+}
+
+static int wl1251_tx_path_status(struct wl1251 *wl)
+{
+        u32 status, addr, data_out_count;
+        bool busy;
+
+        addr = wl->data_path->tx_control_addr;
+        status = wl1251_mem_read32(wl, addr);
+        data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK;
+        busy = wl1251_tx_double_buffer_busy(wl, data_out_count);
+
+        if (busy)
+                return -EBUSY;
+
+        return 0;
+}
+
+static int wl1251_tx_id(struct wl1251 *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 void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr,
+                              struct ieee80211_tx_info *control, u16 fc)
+{
+        *(u16 *)&tx_hdr->control = 0;
+
+        tx_hdr->control.rate_policy = 0;
+
+        /* 802.11 packets */
+        tx_hdr->control.packet_type = 0;
+
+        if (control->flags & IEEE80211_TX_CTL_NO_ACK)
+                tx_hdr->control.ack_policy = 1;
+
+        tx_hdr->control.tx_complete = 1;
+
+        if ((fc & IEEE80211_FTYPE_DATA) &&
+            ((fc & IEEE80211_STYPE_QOS_DATA) ||
+             (fc & IEEE80211_STYPE_QOS_NULLFUNC)))
+                tx_hdr->control.qos = 1;
+}
+
+/* RSN + MIC = 8 + 8 = 16 bytes (worst case - AES). */
+#define MAX_MSDU_SECURITY_LENGTH      16
+#define MAX_MPDU_SECURITY_LENGTH      16
+#define WLAN_QOS_HDR_LEN              26
+#define MAX_MPDU_HEADER_AND_SECURITY  (MAX_MPDU_SECURITY_LENGTH + \
+                                       WLAN_QOS_HDR_LEN)
+#define HW_BLOCK_SIZE                 252
+static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr)
+{
+        u16 payload_len, frag_threshold, mem_blocks;
+        u16 num_mpdus, mem_blocks_per_frag;
+
+        frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
+        tx_hdr->frag_threshold = cpu_to_le16(frag_threshold);
+
+        payload_len = le16_to_cpu(tx_hdr->length) + MAX_MSDU_SECURITY_LENGTH;
+
+        if (payload_len > frag_threshold) {
+                mem_blocks_per_frag =
+                        ((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) /
+                         HW_BLOCK_SIZE) + 1;
+                num_mpdus = payload_len / frag_threshold;
+                mem_blocks = num_mpdus * mem_blocks_per_frag;
+                payload_len -= num_mpdus * frag_threshold;
+                num_mpdus++;
+
+        } else {
+                mem_blocks_per_frag = 0;
+                mem_blocks = 0;
+                num_mpdus = 1;
+        }
+
+        mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1;
+
+        if (num_mpdus > 1)
+                mem_blocks += min(num_mpdus, mem_blocks_per_frag);
+
+        tx_hdr->num_mem_blocks = mem_blocks;
+}
+
+static int wl1251_tx_fill_hdr(struct wl1251 *wl, struct sk_buff *skb,
+                              struct ieee80211_tx_info *control)
+{
+        struct tx_double_buffer_desc *tx_hdr;
+        struct ieee80211_rate *rate;
+        int id;
+        u16 fc;
+
+        if (!skb)
+                return -EINVAL;
+
+        id = wl1251_tx_id(wl, skb);
+        if (id < 0)
+                return id;
+
+        fc = *(u16 *)skb->data;
+        tx_hdr = (struct tx_double_buffer_desc *) skb_push(skb,
+                                                           sizeof(*tx_hdr));
+
+        tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr));
+        rate = ieee80211_get_tx_rate(wl->hw, control);
+        tx_hdr->rate = cpu_to_le16(rate->hw_value);
+        tx_hdr->expiry_time = cpu_to_le32(1 << 16);
+        tx_hdr->id = id;
+
+        tx_hdr->xmit_queue = wl1251_tx_get_queue(skb_get_queue_mapping(skb));
+
+        wl1251_tx_control(tx_hdr, control, fc);
+        wl1251_tx_frag_block_num(tx_hdr);
+
+        return 0;
+}
+
+/* We copy the packet to the target */
+static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb,
+                                 struct ieee80211_tx_info *control)
+{
+        struct tx_double_buffer_desc *tx_hdr;
+        int len;
+        u32 addr;
+
+        if (!skb)
+                return -EINVAL;
+
+        tx_hdr = (struct tx_double_buffer_desc *) skb->data;
+
+        if (control->control.hw_key &&
+            control->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
+                int hdrlen;
+                __le16 fc;
+                u16 length;
+                u8 *pos;
+
+                fc = *(__le16 *)(skb->data + sizeof(*tx_hdr));
+                length = le16_to_cpu(tx_hdr->length) + WL1251_TKIP_IV_SPACE;
+                tx_hdr->length = cpu_to_le16(length);
+
+                hdrlen = ieee80211_hdrlen(fc);
+
+                pos = skb_push(skb, WL1251_TKIP_IV_SPACE);
+                memmove(pos, pos + WL1251_TKIP_IV_SPACE,
+                        sizeof(*tx_hdr) + hdrlen);
+        }
+
+        /* Revisit. 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;
+                wl1251_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);
+                        tx_hdr = (struct tx_double_buffer_desc *) skb->data;
+                } else {
+                        wl1251_info("No handler, fixme!");
+                        return -EINVAL;
+                }
+        }
+
+        /* Our skb->data at this point includes the HW header */
+        len = WL1251_TX_ALIGN(skb->len);
+
+        if (wl->data_in_count & 0x1)
+                addr = wl->data_path->tx_packet_ring_addr +
+                        wl->data_path->tx_packet_ring_chunk_size;
+        else
+                addr = wl->data_path->tx_packet_ring_addr;
+
+        wl1251_mem_write(wl, addr, skb->data, len);
+
+        wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x "
+                     "queue %d", tx_hdr->id, skb, tx_hdr->length,
+                     tx_hdr->rate, tx_hdr->xmit_queue);
+
+        return 0;
+}
+
+static void wl1251_tx_trigger(struct wl1251 *wl)
+{
+        u32 data, addr;
+
+        if (wl->data_in_count & 0x1) {
+                addr = ACX_REG_INTERRUPT_TRIG_H;
+                data = INTR_TRIG_TX_PROC1;
+        } else {
+                addr = ACX_REG_INTERRUPT_TRIG;
+                data = INTR_TRIG_TX_PROC0;
+        }
+
+        wl1251_reg_write32(wl, addr, data);
+
+        /* Bumping data in */
+        wl->data_in_count = (wl->data_in_count + 1) &
+                TX_STATUS_DATA_OUT_COUNT_MASK;
+}
+
+/* caller must hold wl->mutex */
+static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb)
+{
+        struct ieee80211_tx_info *info;
+        int ret = 0;
+        u8 idx;
+
+        info = IEEE80211_SKB_CB(skb);
+
+        if (info->control.hw_key) {
+                idx = info->control.hw_key->hw_key_idx;
+                if (unlikely(wl->default_key != idx)) {
+                        ret = wl1251_acx_default_key(wl, idx);
+                        if (ret < 0)
+                                return ret;
+                }
+        }
+
+        ret = wl1251_tx_path_status(wl);
+        if (ret < 0)
+                return ret;
+
+        ret = wl1251_tx_fill_hdr(wl, skb, info);
+        if (ret < 0)
+                return ret;
+
+        ret = wl1251_tx_send_packet(wl, skb, info);
+        if (ret < 0)
+                return ret;
+
+        wl1251_tx_trigger(wl);
+
+        return ret;
+}
+
+void wl1251_tx_work(struct work_struct *work)
+{
+        struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
+        struct sk_buff *skb;
+        bool woken_up = false;
+        int ret;
+
+        mutex_lock(&wl->mutex);
+
+        if (unlikely(wl->state == WL1251_STATE_OFF))
+                goto out;
+
+        while ((skb = skb_dequeue(&wl->tx_queue))) {
+                if (!woken_up) {
+                        ret = wl1251_ps_elp_wakeup(wl);
+                        if (ret < 0)
+                                goto out;
+                        woken_up = true;
+                }
+
+                ret = wl1251_tx_frame(wl, skb);
+                if (ret == -EBUSY) {
+                        skb_queue_head(&wl->tx_queue, skb);
+                        goto out;
+                } else if (ret < 0) {
+                        dev_kfree_skb(skb);
+                        goto out;
+                }
+        }
+
+out:
+        if (woken_up)
+                wl1251_ps_elp_sleep(wl);
+
+        mutex_unlock(&wl->mutex);
+}
+
+static const char *wl1251_tx_parse_status(u8 status)
+{
+        /* 8 bit status field, one character per bit plus null */
+        static char buf[9];
+        int i = 0;
+
+        memset(buf, 0, sizeof(buf));
+
+        if (status & TX_DMA_ERROR)
+                buf[i++] = 'm';
+        if (status & TX_DISABLED)
+                buf[i++] = 'd';
+        if (status & TX_RETRY_EXCEEDED)
+                buf[i++] = 'r';
+        if (status & TX_TIMEOUT)
+                buf[i++] = 't';
+        if (status & TX_KEY_NOT_FOUND)
+                buf[i++] = 'k';
+        if (status & TX_ENCRYPT_FAIL)
+                buf[i++] = 'e';
+        if (status & TX_UNAVAILABLE_PRIORITY)
+                buf[i++] = 'p';
+
+        /* bit 0 is unused apparently */
+
+        return buf;
+}
+
+static void wl1251_tx_packet_cb(struct wl1251 *wl,
+                                struct tx_result *result)
+{
+        struct ieee80211_tx_info *info;
+        struct sk_buff *skb;
+        int hdrlen, ret;
+        u8 *frame;
+
+        skb = wl->tx_frames[result->id];
+        if (skb == NULL) {
+                wl1251_error("SKB for packet %d is NULL", result->id);
+                return;
+        }
+
+        info = IEEE80211_SKB_CB(skb);
+
+        if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
+            (result->status == TX_SUCCESS))
+                info->flags |= IEEE80211_TX_STAT_ACK;
+
+        info->status.rates[0].count = result->ack_failures + 1;
+        wl->stats.retry_count += result->ack_failures;
+
+        /*
+         * We have to remove our private TX header before pushing
+         * the skb back to mac80211.
+         */
+        frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
+        if (info->control.hw_key &&
+            info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
+                hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+                memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
+                skb_pull(skb, WL1251_TKIP_IV_SPACE);
+        }
+
+        wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
+                     " status 0x%x (%s)",
+                     result->id, skb, result->ack_failures, result->rate,
+                     result->status, wl1251_tx_parse_status(result->status));
+
+
+        ieee80211_tx_status(wl->hw, skb);
+
+        wl->tx_frames[result->id] = NULL;
+
+        if (wl->tx_queue_stopped) {
+                wl1251_debug(DEBUG_TX, "cb: queue was stopped");
+
+                skb = skb_dequeue(&wl->tx_queue);
+
+                /* The skb can be NULL because tx_work might have been
+                   scheduled before the queue was stopped making the
+                   queue empty */
+
+                if (skb) {
+                        ret = wl1251_tx_frame(wl, skb);
+                        if (ret == -EBUSY) {
+                                /* firmware buffer is still full */
+                                wl1251_debug(DEBUG_TX, "cb: fw buffer "
+                                             "still full");
+                                skb_queue_head(&wl->tx_queue, skb);
+                                return;
+                        } else if (ret < 0) {
+                                dev_kfree_skb(skb);
+                                return;
+                        }
+                }
+
+                wl1251_debug(DEBUG_TX, "cb: waking queues");
+                ieee80211_wake_queues(wl->hw);
+                wl->tx_queue_stopped = false;
+        }
+}
+
+/* Called upon reception of a TX complete interrupt */
+void wl1251_tx_complete(struct wl1251 *wl)
+{
+        int i, result_index, num_complete = 0;
+        struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
+        unsigned long flags;
+
+        if (unlikely(wl->state != WL1251_STATE_ON))
+                return;
+
+        /* First we read the result */
+        wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
+                            result, sizeof(result));
+
+        result_index = wl->next_tx_complete;
+
+        for (i = 0; i < ARRAY_SIZE(result); i++) {
+                result_ptr = &result[result_index];
+
+                if (result_ptr->done_1 == 1 &&
+                    result_ptr->done_2 == 1) {
+                        wl1251_tx_packet_cb(wl, result_ptr);
+
+                        result_ptr->done_1 = 0;
+                        result_ptr->done_2 = 0;
+
+                        result_index = (result_index + 1) &
+                                (FW_TX_CMPLT_BLOCK_SIZE - 1);
+                        num_complete++;
+                } else {
+                        break;
+                }
+        }
+
+        if (wl->tx_queue_stopped
+            &&
+            skb_queue_len(&wl->tx_queue) <= WL1251_TX_QUEUE_LOW_WATERMARK){
+
+                /* firmware buffer has space, restart queues */
+                wl1251_debug(DEBUG_TX, "tx_complete: waking queues");
+                spin_lock_irqsave(&wl->wl_lock, flags);
+                ieee80211_wake_queues(wl->hw);
+                wl->tx_queue_stopped = false;
+                spin_unlock_irqrestore(&wl->wl_lock, flags);
+                ieee80211_queue_work(wl->hw, &wl->tx_work);
+
+        }
+
+        /* Every completed frame needs to be acknowledged */
+        if (num_complete) {
+                /*
+                 * If we've wrapped, we have to clear
+                 * the results in 2 steps.
+                 */
+                if (result_index > wl->next_tx_complete) {
+                        /* Only 1 write is needed */
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr +
+                                         (wl->next_tx_complete *
+                                          sizeof(struct tx_result)),
+                                         &result[wl->next_tx_complete],
+                                         num_complete *
+                                         sizeof(struct tx_result));
+
+
+                } else if (result_index < wl->next_tx_complete) {
+                        /* 2 writes are needed */
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr +
+                                         (wl->next_tx_complete *
+                                          sizeof(struct tx_result)),
+                                         &result[wl->next_tx_complete],
+                                         (FW_TX_CMPLT_BLOCK_SIZE -
+                                          wl->next_tx_complete) *
+                                         sizeof(struct tx_result));
+
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr,
+                                         result,
+                                         (num_complete -
+                                          FW_TX_CMPLT_BLOCK_SIZE +
+                                          wl->next_tx_complete) *
+                                         sizeof(struct tx_result));
+
+                } else {
+                        /* We have to write the whole array */
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr,
+                                         result,
+                                         FW_TX_CMPLT_BLOCK_SIZE *
+                                         sizeof(struct tx_result));
+                }
+
+        }
+
+        wl->next_tx_complete = result_index;
+}
+
+/* caller must hold wl->mutex */
+void wl1251_tx_flush(struct wl1251 *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);
+
+                wl1251_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;
+                }
+}