1 files changed, 498 insertions, 0 deletions
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_cdc.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_cdc.c
new file mode 100644
index 000000000000..e34c5c3d1d55
--- /dev/null
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_cdc.c
@@ -0,0 +1,498 @@
+/*
+ * Copyright (c) 2010 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*******************************************************************************
+ * Communicates with the dongle by using dcmd codes.
+ * For certain dcmd codes, the dongle interprets string data from the host.
+ ******************************************************************************/
+
+#include <linux/types.h>
+#include <linux/netdevice.h>
+#include <linux/sched.h>
+#include <defs.h>
+
+#include <brcmu_utils.h>
+#include <brcmu_wifi.h>
+
+#include "dhd.h"
+#include "dhd_proto.h"
+#include "dhd_bus.h"
+#include "dhd_dbg.h"
+
+struct brcmf_proto_cdc_dcmd {
+	__le32 cmd;	/* dongle command value */
+	__le32 len;	/* lower 16: output buflen;
+			 * upper 16: input buflen (excludes header) */
+	__le32 flags;	/* flag defns given below */
+	__le32 status;	/* status code returned from the device */
+};
+
+/* Max valid buffer size that can be sent to the dongle */
+#define CDC_MAX_MSG_SIZE	(ETH_FRAME_LEN+ETH_FCS_LEN)
+
+/* CDC flag definitions */
+#define CDC_DCMD_ERROR		0x01	/* 1=cmd failed */
+#define CDC_DCMD_SET		0x02	/* 0=get, 1=set cmd */
+#define CDC_DCMD_IF_MASK	0xF000		/* I/F index */
+#define CDC_DCMD_IF_SHIFT	12
+#define CDC_DCMD_ID_MASK	0xFFFF0000	/* id an cmd pairing */
+#define CDC_DCMD_ID_SHIFT	16		/* ID Mask shift bits */
+#define CDC_DCMD_ID(flags)	\
+	(((flags) & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT)
+
+/*
+ * BDC header - Broadcom specific extension of CDC.
+ * Used on data packets to convey priority across USB.
+ */
+#define	BDC_HEADER_LEN		4
+#define BDC_PROTO_VER		1	/* Protocol version */
+#define BDC_FLAG_VER_MASK	0xf0	/* Protocol version mask */
+#define BDC_FLAG_VER_SHIFT	4	/* Protocol version shift */
+#define BDC_FLAG_SUM_GOOD	0x04	/* Good RX checksums */
+#define BDC_FLAG_SUM_NEEDED	0x08	/* Dongle needs to do TX checksums */
+#define BDC_PRIORITY_MASK	0x7
+#define BDC_FLAG2_IF_MASK	0x0f	/* packet rx interface in APSTA */
+#define BDC_FLAG2_IF_SHIFT	0
+
+#define BDC_GET_IF_IDX(hdr) \
+	((int)((((hdr)->flags2) & BDC_FLAG2_IF_MASK) >> BDC_FLAG2_IF_SHIFT))
+#define BDC_SET_IF_IDX(hdr, idx) \
+	((hdr)->flags2 = (((hdr)->flags2 & ~BDC_FLAG2_IF_MASK) | \
+	((idx) << BDC_FLAG2_IF_SHIFT)))
+
+struct brcmf_proto_bdc_header {
+	u8 flags;
+	u8 priority;	/* 802.1d Priority, 4:7 flow control info for usb */
+	u8 flags2;
+	u8 rssi;
+};
+
+
+#define RETRIES 2 /* # of retries to retrieve matching dcmd response */
+#define BUS_HEADER_LEN	(16+BRCMF_SDALIGN) /* Must be atleast SDPCM_RESERVE
+					 * (amount of header tha might be added)
+					 * plus any space that might be needed
+					 * for alignment padding.
+					 */
+#define ROUND_UP_MARGIN	2048	/* Biggest SDIO block size possible for
+				 * round off at the end of buffer
+				 */
+
+struct brcmf_proto {
+	u16 reqid;
+	u8 pending;
+	u32 lastcmd;
+	u8 bus_header[BUS_HEADER_LEN];
+	struct brcmf_proto_cdc_dcmd msg;
+	unsigned char buf[BRCMF_DCMD_MAXLEN + ROUND_UP_MARGIN];
+};
+
+static int brcmf_proto_cdc_msg(struct brcmf_pub *drvr)
+{
+	struct brcmf_proto *prot = drvr->prot;
+	int len = le32_to_cpu(prot->msg.len) +
+			sizeof(struct brcmf_proto_cdc_dcmd);
+
+	brcmf_dbg(TRACE, "Enter\n");
+
+	/* NOTE : cdc->msg.len holds the desired length of the buffer to be
+	 *        returned. Only up to CDC_MAX_MSG_SIZE of this buffer area
+	 *        is actually sent to the dongle
+	 */
+	if (len > CDC_MAX_MSG_SIZE)
+		len = CDC_MAX_MSG_SIZE;
+
+	/* Send request */
+	return brcmf_sdbrcm_bus_txctl(drvr->bus, (unsigned char *)&prot->msg,
+				      len);
+}
+
+static int brcmf_proto_cdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
+{
+	int ret;
+	struct brcmf_proto *prot = drvr->prot;
+
+	brcmf_dbg(TRACE, "Enter\n");
+
+	do {
+		ret = brcmf_sdbrcm_bus_rxctl(drvr->bus,
+				(unsigned char *)&prot->msg,
+				len + sizeof(struct brcmf_proto_cdc_dcmd));
+		if (ret < 0)
+			break;
+	} while (CDC_DCMD_ID(le32_to_cpu(prot->msg.flags)) != id);
+
+	return ret;
+}
+
+int
+brcmf_proto_cdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
+			       void *buf, uint len)
+{
+	struct brcmf_proto *prot = drvr->prot;
+	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
+	void *info;
+	int ret = 0, retries = 0;
+	u32 id, flags;
+
+	brcmf_dbg(TRACE, "Enter\n");
+	brcmf_dbg(CTL, "cmd %d len %d\n", cmd, len);
+
+	/* Respond "bcmerror" and "bcmerrorstr" with local cache */
+	if (cmd == BRCMF_C_GET_VAR && buf) {
+		if (!strcmp((char *)buf, "bcmerrorstr")) {
+			strncpy((char *)buf, "bcm_error",
+				BCME_STRLEN);
+			goto done;
+		} else if (!strcmp((char *)buf, "bcmerror")) {
+			*(int *)buf = drvr->dongle_error;
+			goto done;
+		}
+	}
+
+	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
+
+	msg->cmd = cpu_to_le32(cmd);
+	msg->len = cpu_to_le32(len);
+	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT);
+	flags = (flags & ~CDC_DCMD_IF_MASK) |
+		(ifidx << CDC_DCMD_IF_SHIFT);
+	msg->flags = cpu_to_le32(flags);
+
+	if (buf)
+		memcpy(prot->buf, buf, len);
+
+	ret = brcmf_proto_cdc_msg(drvr);
+	if (ret < 0) {
+		brcmf_dbg(ERROR, "brcmf_proto_cdc_msg failed w/status %d\n",
+			  ret);
+		goto done;
+	}
+
+retry:
+	/* wait for interrupt and get first fragment */
+	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
+	if (ret < 0)
+		goto done;
+
+	flags = le32_to_cpu(msg->flags);
+	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
+
+	if ((id < prot->reqid) && (++retries < RETRIES))
+		goto retry;
+	if (id != prot->reqid) {
+		brcmf_dbg(ERROR, "%s: unexpected request id %d (expected %d)\n",
+			  brcmf_ifname(drvr, ifidx), id, prot->reqid);
+		ret = -EINVAL;
+		goto done;
+	}
+
+	/* Check info buffer */
+	info = (void *)&msg[1];
+
+	/* Copy info buffer */
+	if (buf) {
+		if (ret < (int)len)
+			len = ret;
+		memcpy(buf, info, len);
+	}
+
+	/* Check the ERROR flag */
+	if (flags & CDC_DCMD_ERROR) {
+		ret = le32_to_cpu(msg->status);
+		/* Cache error from dongle */
+		drvr->dongle_error = ret;
+	}
+
+done:
+	return ret;
+}
+
+int brcmf_proto_cdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
+				 void *buf, uint len)
+{
+	struct brcmf_proto *prot = drvr->prot;
+	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
+	int ret = 0;
+	u32 flags, id;
+
+	brcmf_dbg(TRACE, "Enter\n");
+	brcmf_dbg(CTL, "cmd %d len %d\n", cmd, len);
+
+	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
+
+	msg->cmd = cpu_to_le32(cmd);
+	msg->len = cpu_to_le32(len);
+	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT) | CDC_DCMD_SET;
+	flags = (flags & ~CDC_DCMD_IF_MASK) |
+		(ifidx << CDC_DCMD_IF_SHIFT);
+	msg->flags = cpu_to_le32(flags);
+
+	if (buf)
+		memcpy(prot->buf, buf, len);
+
+	ret = brcmf_proto_cdc_msg(drvr);
+	if (ret < 0)
+		goto done;
+
+	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
+	if (ret < 0)
+		goto done;
+
+	flags = le32_to_cpu(msg->flags);
+	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
+
+	if (id != prot->reqid) {
+		brcmf_dbg(ERROR, "%s: unexpected request id %d (expected %d)\n",
+			  brcmf_ifname(drvr, ifidx), id, prot->reqid);
+		ret = -EINVAL;
+		goto done;
+	}
+
+	/* Check the ERROR flag */
+	if (flags & CDC_DCMD_ERROR) {
+		ret = le32_to_cpu(msg->status);
+		/* Cache error from dongle */
+		drvr->dongle_error = ret;
+	}
+
+done:
+	return ret;
+}
+
+int
+brcmf_proto_dcmd(struct brcmf_pub *drvr, int ifidx, struct brcmf_dcmd *dcmd,
+		  int len)
+{
+	struct brcmf_proto *prot = drvr->prot;
+	int ret = -1;
+
+	if (drvr->busstate == BRCMF_BUS_DOWN) {
+		brcmf_dbg(ERROR, "bus is down. we have nothing to do.\n");
+		return ret;
+	}
+	brcmf_os_proto_block(drvr);
+
+	brcmf_dbg(TRACE, "Enter\n");
+
+	if (len > BRCMF_DCMD_MAXLEN)
+		goto done;
+
+	if (prot->pending == true) {
+		brcmf_dbg(TRACE, "CDC packet is pending!!!! cmd=0x%x (%lu) lastcmd=0x%x (%lu)\n",
+			  dcmd->cmd, (unsigned long)dcmd->cmd, prot->lastcmd,
+			  (unsigned long)prot->lastcmd);
+		if (dcmd->cmd == BRCMF_C_SET_VAR ||
+		    dcmd->cmd == BRCMF_C_GET_VAR)
+			brcmf_dbg(TRACE, "iovar cmd=%s\n", (char *)dcmd->buf);
+
+		goto done;
+	}
+
+	prot->pending = true;
+	prot->lastcmd = dcmd->cmd;
+	if (dcmd->set)
+		ret = brcmf_proto_cdc_set_dcmd(drvr, ifidx, dcmd->cmd,
+						   dcmd->buf, len);
+	else {
+		ret = brcmf_proto_cdc_query_dcmd(drvr, ifidx, dcmd->cmd,
+						     dcmd->buf, len);
+		if (ret > 0)
+			dcmd->used = ret -
+					sizeof(struct brcmf_proto_cdc_dcmd);
+	}
+
+	if (ret >= 0)
+		ret = 0;
+	else {
+		struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
+		/* len == needed when set/query fails from dongle */
+		dcmd->needed = le32_to_cpu(msg->len);
+	}
+
+	/* Intercept the wme_dp dongle cmd here */
+	if (!ret && dcmd->cmd == BRCMF_C_SET_VAR &&
+	    !strcmp(dcmd->buf, "wme_dp")) {
+		int slen;
+		__le32 val = 0;
+
+		slen = strlen("wme_dp") + 1;
+		if (len >= (int)(slen + sizeof(int)))
+			memcpy(&val, (char *)dcmd->buf + slen, sizeof(int));
+		drvr->wme_dp = (u8) le32_to_cpu(val);
+	}
+
+	prot->pending = false;
+
+done:
+	brcmf_os_proto_unblock(drvr);
+
+	return ret;
+}
+
+static bool pkt_sum_needed(struct sk_buff *skb)
+{
+	return skb->ip_summed == CHECKSUM_PARTIAL;
+}
+
+static void pkt_set_sum_good(struct sk_buff *skb, bool x)
+{
+	skb->ip_summed = (x ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
+}
+
+void brcmf_proto_hdrpush(struct brcmf_pub *drvr, int ifidx,
+			 struct sk_buff *pktbuf)
+{
+	struct brcmf_proto_bdc_header *h;
+
+	brcmf_dbg(TRACE, "Enter\n");
+
+	/* Push BDC header used to convey priority for buses that don't */
+
+	skb_push(pktbuf, BDC_HEADER_LEN);
+
+	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);
+
+	h->flags = (BDC_PROTO_VER << BDC_FLAG_VER_SHIFT);
+	if (pkt_sum_needed(pktbuf))
+		h->flags |= BDC_FLAG_SUM_NEEDED;
+
+	h->priority = (pktbuf->priority & BDC_PRIORITY_MASK);
+	h->flags2 = 0;
+	h->rssi = 0;
+	BDC_SET_IF_IDX(h, ifidx);
+}
+
+int brcmf_proto_hdrpull(struct brcmf_pub *drvr, int *ifidx,
+			struct sk_buff *pktbuf)
+{
+	struct brcmf_proto_bdc_header *h;
+
+	brcmf_dbg(TRACE, "Enter\n");
+
+	/* Pop BDC header used to convey priority for buses that don't */
+
+	if (pktbuf->len < BDC_HEADER_LEN) {
+		brcmf_dbg(ERROR, "rx data too short (%d < %d)\n",
+			  pktbuf->len, BDC_HEADER_LEN);
+		return -EBADE;
+	}
+
+	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);
+
+	*ifidx = BDC_GET_IF_IDX(h);
+	if (*ifidx >= BRCMF_MAX_IFS) {
+		brcmf_dbg(ERROR, "rx data ifnum out of range (%d)\n", *ifidx);
+		return -EBADE;
+	}
+
+	if (((h->flags & BDC_FLAG_VER_MASK) >> BDC_FLAG_VER_SHIFT) !=
+	    BDC_PROTO_VER) {
+		brcmf_dbg(ERROR, "%s: non-BDC packet received, flags 0x%x\n",
+			  brcmf_ifname(drvr, *ifidx), h->flags);
+		return -EBADE;
+	}
+
+	if (h->flags & BDC_FLAG_SUM_GOOD) {
+		brcmf_dbg(INFO, "%s: BDC packet received with good rx-csum, flags 0x%x\n",
+			  brcmf_ifname(drvr, *ifidx), h->flags);
+		pkt_set_sum_good(pktbuf, true);
+	}
+
+	pktbuf->priority = h->priority & BDC_PRIORITY_MASK;
+
+	skb_pull(pktbuf, BDC_HEADER_LEN);
+
+	return 0;
+}
+
+int brcmf_proto_attach(struct brcmf_pub *drvr)
+{
+	struct brcmf_proto *cdc;
+
+	cdc = kzalloc(sizeof(struct brcmf_proto), GFP_ATOMIC);
+	if (!cdc)
+		goto fail;
+
+	/* ensure that the msg buf directly follows the cdc msg struct */
+	if ((unsigned long)(&cdc->msg + 1) != (unsigned long)cdc->buf) {
+		brcmf_dbg(ERROR, "struct brcmf_proto is not correctly defined\n");
+		goto fail;
+	}
+
+	drvr->prot = cdc;
+	drvr->hdrlen += BDC_HEADER_LEN;
+	drvr->maxctl = BRCMF_DCMD_MAXLEN +
+			sizeof(struct brcmf_proto_cdc_dcmd) + ROUND_UP_MARGIN;
+	return 0;
+
+fail:
+	kfree(cdc);
+	return -ENOMEM;
+}
+
+/* ~NOTE~ What if another thread is waiting on the semaphore?  Holding it? */
+void brcmf_proto_detach(struct brcmf_pub *drvr)
+{
+	kfree(drvr->prot);
+	drvr->prot = NULL;
+}
+
+void brcmf_proto_dstats(struct brcmf_pub *drvr)
+{
+	/* No stats from dongle added yet, copy bus stats */
+	drvr->dstats.tx_packets = drvr->tx_packets;
+	drvr->dstats.tx_errors = drvr->tx_errors;
+	drvr->dstats.rx_packets = drvr->rx_packets;
+	drvr->dstats.rx_errors = drvr->rx_errors;
+	drvr->dstats.rx_dropped = drvr->rx_dropped;
+	drvr->dstats.multicast = drvr->rx_multicast;
+	return;
+}
+
+int brcmf_proto_init(struct brcmf_pub *drvr)
+{
+	int ret = 0;
+	char buf[128];
+
+	brcmf_dbg(TRACE, "Enter\n");
+
+	brcmf_os_proto_block(drvr);
+
+	/* Get the device MAC address */
+	strcpy(buf, "cur_etheraddr");
+	ret = brcmf_proto_cdc_query_dcmd(drvr, 0, BRCMF_C_GET_VAR,
+					  buf, sizeof(buf));
+	if (ret < 0) {
+		brcmf_os_proto_unblock(drvr);
+		return ret;
+	}
+	memcpy(drvr->mac, buf, ETH_ALEN);
+
+	brcmf_os_proto_unblock(drvr);
+
+	ret = brcmf_c_preinit_dcmds(drvr);
+
+	/* Always assumes wl for now */
+	drvr->iswl = true;
+
+	return ret;
+}
+
+void brcmf_proto_stop(struct brcmf_pub *drvr)
+{
+	/* Nothing to do for CDC */
+}