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, 190 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl1251/rx.c b/drivers/net/wireless/wl1251/rx.c
new file mode 100644
index 00000000000..efa53607d5c
--- /dev/null
+++ b/drivers/net/wireless/wl1251/rx.c
@@ -0,0 +1,190 @@
+/*
+ * 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/skbuff.h>
+#include <linux/gfp.h>
+#include <net/mac80211.h>
+
+#include "wl1251.h"
+#include "reg.h"
+#include "io.h"
+#include "rx.h"
+#include "cmd.h"
+#include "acx.h"
+
+static void wl1251_rx_header(struct wl1251 *wl,
+			     struct wl1251_rx_descriptor *desc)
+{
+	u32 rx_packet_ring_addr;
+
+	rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr;
+	if (wl->rx_current_buffer)
+		rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size;
+
+	wl1251_mem_read(wl, rx_packet_ring_addr, desc, sizeof(*desc));
+}
+
+static void wl1251_rx_status(struct wl1251 *wl,
+			     struct wl1251_rx_descriptor *desc,
+			     struct ieee80211_rx_status *status,
+			     u8 beacon)
+{
+	u64 mactime;
+	int ret;
+
+	memset(status, 0, sizeof(struct ieee80211_rx_status));
+
+	status->band = IEEE80211_BAND_2GHZ;
+	status->mactime = desc->timestamp;
+
+	/*
+	 * The rx status timestamp is a 32 bits value while the TSF is a
+	 * 64 bits one.
+	 * For IBSS merging, TSF is mandatory, so we have to get it
+	 * somehow, so we ask for ACX_TSF_INFO.
+	 * That could be moved to the get_tsf() hook, but unfortunately,
+	 * this one must be atomic, while our SPI routines can sleep.
+	 */
+	if ((wl->bss_type == BSS_TYPE_IBSS) && beacon) {
+		ret = wl1251_acx_tsf_info(wl, &mactime);
+		if (ret == 0)
+			status->mactime = mactime;
+	}
+
+	status->signal = desc->rssi;
+
+	/*
+	 * FIXME: guessing that snr needs to be divided by two, otherwise
+	 * the values don't make any sense
+	 */
+	wl->noise = desc->rssi - desc->snr / 2;
+
+	status->freq = ieee80211_channel_to_frequency(desc->channel);
+
+	status->flag |= RX_FLAG_TSFT;
+
+	if (desc->flags & RX_DESC_ENCRYPTION_MASK) {
+		status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
+
+		if (likely(!(desc->flags & RX_DESC_DECRYPT_FAIL)))
+			status->flag |= RX_FLAG_DECRYPTED;
+
+		if (unlikely(desc->flags & RX_DESC_MIC_FAIL))
+			status->flag |= RX_FLAG_MMIC_ERROR;
+	}
+
+	if (unlikely(!(desc->flags & RX_DESC_VALID_FCS)))
+		status->flag |= RX_FLAG_FAILED_FCS_CRC;
+
+
+	/* FIXME: set status->rate_idx */
+}
+
+static void wl1251_rx_body(struct wl1251 *wl,
+			   struct wl1251_rx_descriptor *desc)
+{
+	struct sk_buff *skb;
+	struct ieee80211_rx_status status;
+	u8 *rx_buffer, beacon = 0;
+	u16 length, *fc;
+	u32 curr_id, last_id_inc, rx_packet_ring_addr;
+
+	length = WL1251_RX_ALIGN(desc->length  - PLCP_HEADER_LENGTH);
+	curr_id = (desc->flags & RX_DESC_SEQNUM_MASK) >> RX_DESC_PACKETID_SHIFT;
+	last_id_inc = (wl->rx_last_id + 1) % (RX_MAX_PACKET_ID + 1);
+
+	if (last_id_inc != curr_id) {
+		wl1251_warning("curr ID:%d, last ID inc:%d",
+			       curr_id, last_id_inc);
+		wl->rx_last_id = curr_id;
+	} else {
+		wl->rx_last_id = last_id_inc;
+	}
+
+	rx_packet_ring_addr = wl->data_path->rx_packet_ring_addr +
+		sizeof(struct wl1251_rx_descriptor) + 20;
+	if (wl->rx_current_buffer)
+		rx_packet_ring_addr += wl->data_path->rx_packet_ring_chunk_size;
+
+	skb = __dev_alloc_skb(length, GFP_KERNEL);
+	if (!skb) {
+		wl1251_error("Couldn't allocate RX frame");
+		return;
+	}
+
+	rx_buffer = skb_put(skb, length);
+	wl1251_mem_read(wl, rx_packet_ring_addr, rx_buffer, length);
+
+	/* The actual lenght doesn't include the target's alignment */
+	skb->len = desc->length  - PLCP_HEADER_LENGTH;
+
+	fc = (u16 *)skb->data;
+
+	if ((*fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
+		beacon = 1;
+
+	wl1251_rx_status(wl, desc, &status, beacon);
+
+	wl1251_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
+		     beacon ? "beacon" : "");
+
+	memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
+	ieee80211_rx_ni(wl->hw, skb);
+}
+
+static void wl1251_rx_ack(struct wl1251 *wl)
+{
+	u32 data, addr;
+
+	if (wl->rx_current_buffer) {
+		addr = ACX_REG_INTERRUPT_TRIG_H;
+		data = INTR_TRIG_RX_PROC1;
+	} else {
+		addr = ACX_REG_INTERRUPT_TRIG;
+		data = INTR_TRIG_RX_PROC0;
+	}
+
+	wl1251_reg_write32(wl, addr, data);
+
+	/* Toggle buffer ring */
+	wl->rx_current_buffer = !wl->rx_current_buffer;
+}
+
+
+void wl1251_rx(struct wl1251 *wl)
+{
+	struct wl1251_rx_descriptor *rx_desc;
+
+	if (wl->state != WL1251_STATE_ON)
+		return;
+
+	rx_desc = wl->rx_descriptor;
+
+	/* We first read the frame's header */
+	wl1251_rx_header(wl, rx_desc);
+
+	/* Now we can read the body */
+	wl1251_rx_body(wl, rx_desc);
+
+	/* Finally, we need to ACK the RX */
+	wl1251_rx_ack(wl);
+}