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path: root/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c
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Diffstat (limited to 'drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c')
-rw-r--r--drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c389
1 files changed, 389 insertions, 0 deletions
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c
new file mode 100644
index 000000000000..288c84e7c56b
--- /dev/null
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c
@@ -0,0 +1,389 @@
+/*
+ * 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 <brcmu_utils.h>
+#include <brcmu_wifi.h>
+
+#include "core.h"
+#include "bus.h"
+#include "fwsignal.h"
+#include "debug.h"
+#include "tracepoint.h"
+#include "proto.h"
+#include "bcdc.h"
+
+struct brcmf_proto_bcdc_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 */
+};
+
+/* BCDC flag definitions */
+#define BCDC_DCMD_ERROR 0x01 /* 1=cmd failed */
+#define BCDC_DCMD_SET 0x02 /* 0=get, 1=set cmd */
+#define BCDC_DCMD_IF_MASK 0xF000 /* I/F index */
+#define BCDC_DCMD_IF_SHIFT 12
+#define BCDC_DCMD_ID_MASK 0xFFFF0000 /* id an cmd pairing */
+#define BCDC_DCMD_ID_SHIFT 16 /* ID Mask shift bits */
+#define BCDC_DCMD_ID(flags) \
+ (((flags) & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT)
+
+/*
+ * BCDC header - Broadcom specific extension of CDC.
+ * Used on data packets to convey priority across USB.
+ */
+#define BCDC_HEADER_LEN 4
+#define BCDC_PROTO_VER 2 /* Protocol version */
+#define BCDC_FLAG_VER_MASK 0xf0 /* Protocol version mask */
+#define BCDC_FLAG_VER_SHIFT 4 /* Protocol version shift */
+#define BCDC_FLAG_SUM_GOOD 0x04 /* Good RX checksums */
+#define BCDC_FLAG_SUM_NEEDED 0x08 /* Dongle needs to do TX checksums */
+#define BCDC_PRIORITY_MASK 0x7
+#define BCDC_FLAG2_IF_MASK 0x0f /* packet rx interface in APSTA */
+#define BCDC_FLAG2_IF_SHIFT 0
+
+#define BCDC_GET_IF_IDX(hdr) \
+ ((int)((((hdr)->flags2) & BCDC_FLAG2_IF_MASK) >> BCDC_FLAG2_IF_SHIFT))
+#define BCDC_SET_IF_IDX(hdr, idx) \
+ ((hdr)->flags2 = (((hdr)->flags2 & ~BCDC_FLAG2_IF_MASK) | \
+ ((idx) << BCDC_FLAG2_IF_SHIFT)))
+
+/**
+ * struct brcmf_proto_bcdc_header - BCDC header format
+ *
+ * @flags: flags contain protocol and checksum info.
+ * @priority: 802.1d priority and USB flow control info (bit 4:7).
+ * @flags2: additional flags containing dongle interface index.
+ * @data_offset: start of packet data. header is following by firmware signals.
+ */
+struct brcmf_proto_bcdc_header {
+ u8 flags;
+ u8 priority;
+ u8 flags2;
+ u8 data_offset;
+};
+
+/*
+ * maximum length of firmware signal data between
+ * the BCDC header and packet data in the tx path.
+ */
+#define BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES 12
+
+#define RETRIES 2 /* # of retries to retrieve matching dcmd response */
+#define BUS_HEADER_LEN (16+64) /* Must be atleast SDPCM_RESERVE
+ * (amount of header tha might be added)
+ * plus any space that might be needed
+ * for bus alignment padding.
+ */
+struct brcmf_bcdc {
+ u16 reqid;
+ u8 bus_header[BUS_HEADER_LEN];
+ struct brcmf_proto_bcdc_dcmd msg;
+ unsigned char buf[BRCMF_DCMD_MAXLEN];
+};
+
+
+static int
+brcmf_proto_bcdc_msg(struct brcmf_pub *drvr, int ifidx, uint cmd, void *buf,
+ uint len, bool set)
+{
+ struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
+ struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
+ u32 flags;
+
+ brcmf_dbg(BCDC, "Enter\n");
+
+ memset(msg, 0, sizeof(struct brcmf_proto_bcdc_dcmd));
+
+ msg->cmd = cpu_to_le32(cmd);
+ msg->len = cpu_to_le32(len);
+ flags = (++bcdc->reqid << BCDC_DCMD_ID_SHIFT);
+ if (set)
+ flags |= BCDC_DCMD_SET;
+ flags = (flags & ~BCDC_DCMD_IF_MASK) |
+ (ifidx << BCDC_DCMD_IF_SHIFT);
+ msg->flags = cpu_to_le32(flags);
+
+ if (buf)
+ memcpy(bcdc->buf, buf, len);
+
+ len += sizeof(*msg);
+ if (len > BRCMF_TX_IOCTL_MAX_MSG_SIZE)
+ len = BRCMF_TX_IOCTL_MAX_MSG_SIZE;
+
+ /* Send request */
+ return brcmf_bus_txctl(drvr->bus_if, (unsigned char *)&bcdc->msg, len);
+}
+
+static int brcmf_proto_bcdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
+{
+ int ret;
+ struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
+
+ brcmf_dbg(BCDC, "Enter\n");
+ len += sizeof(struct brcmf_proto_bcdc_dcmd);
+ do {
+ ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&bcdc->msg,
+ len);
+ if (ret < 0)
+ break;
+ } while (BCDC_DCMD_ID(le32_to_cpu(bcdc->msg.flags)) != id);
+
+ return ret;
+}
+
+static int
+brcmf_proto_bcdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
+ void *buf, uint len)
+{
+ struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
+ struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
+ void *info;
+ int ret = 0, retries = 0;
+ u32 id, flags;
+
+ brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);
+
+ ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, false);
+ if (ret < 0) {
+ brcmf_err("brcmf_proto_bcdc_msg failed w/status %d\n",
+ ret);
+ goto done;
+ }
+
+retry:
+ /* wait for interrupt and get first fragment */
+ ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
+ if (ret < 0)
+ goto done;
+
+ flags = le32_to_cpu(msg->flags);
+ id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;
+
+ if ((id < bcdc->reqid) && (++retries < RETRIES))
+ goto retry;
+ if (id != bcdc->reqid) {
+ brcmf_err("%s: unexpected request id %d (expected %d)\n",
+ brcmf_ifname(drvr, ifidx), id, bcdc->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 & BCDC_DCMD_ERROR)
+ ret = le32_to_cpu(msg->status);
+
+done:
+ return ret;
+}
+
+static int
+brcmf_proto_bcdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
+ void *buf, uint len)
+{
+ struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
+ struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
+ int ret = 0;
+ u32 flags, id;
+
+ brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);
+
+ ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, true);
+ if (ret < 0)
+ goto done;
+
+ ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
+ if (ret < 0)
+ goto done;
+
+ flags = le32_to_cpu(msg->flags);
+ id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;
+
+ if (id != bcdc->reqid) {
+ brcmf_err("%s: unexpected request id %d (expected %d)\n",
+ brcmf_ifname(drvr, ifidx), id, bcdc->reqid);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ /* Check the ERROR flag */
+ if (flags & BCDC_DCMD_ERROR)
+ ret = le32_to_cpu(msg->status);
+
+done:
+ return ret;
+}
+
+static void
+brcmf_proto_bcdc_hdrpush(struct brcmf_pub *drvr, int ifidx, u8 offset,
+ struct sk_buff *pktbuf)
+{
+ struct brcmf_proto_bcdc_header *h;
+
+ brcmf_dbg(BCDC, "Enter\n");
+
+ /* Push BDC header used to convey priority for buses that don't */
+ skb_push(pktbuf, BCDC_HEADER_LEN);
+
+ h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);
+
+ h->flags = (BCDC_PROTO_VER << BCDC_FLAG_VER_SHIFT);
+ if (pktbuf->ip_summed == CHECKSUM_PARTIAL)
+ h->flags |= BCDC_FLAG_SUM_NEEDED;
+
+ h->priority = (pktbuf->priority & BCDC_PRIORITY_MASK);
+ h->flags2 = 0;
+ h->data_offset = offset;
+ BCDC_SET_IF_IDX(h, ifidx);
+ trace_brcmf_bcdchdr(pktbuf->data);
+}
+
+static int
+brcmf_proto_bcdc_hdrpull(struct brcmf_pub *drvr, bool do_fws,
+ struct sk_buff *pktbuf, struct brcmf_if **ifp)
+{
+ struct brcmf_proto_bcdc_header *h;
+ struct brcmf_if *tmp_if;
+
+ brcmf_dbg(BCDC, "Enter\n");
+
+ /* Pop BCDC header used to convey priority for buses that don't */
+ if (pktbuf->len <= BCDC_HEADER_LEN) {
+ brcmf_dbg(INFO, "rx data too short (%d <= %d)\n",
+ pktbuf->len, BCDC_HEADER_LEN);
+ return -EBADE;
+ }
+
+ trace_brcmf_bcdchdr(pktbuf->data);
+ h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);
+
+ tmp_if = brcmf_get_ifp(drvr, BCDC_GET_IF_IDX(h));
+ if (!tmp_if) {
+ brcmf_dbg(INFO, "no matching ifp found\n");
+ return -EBADE;
+ }
+ if (((h->flags & BCDC_FLAG_VER_MASK) >> BCDC_FLAG_VER_SHIFT) !=
+ BCDC_PROTO_VER) {
+ brcmf_err("%s: non-BCDC packet received, flags 0x%x\n",
+ brcmf_ifname(drvr, tmp_if->ifidx), h->flags);
+ return -EBADE;
+ }
+
+ if (h->flags & BCDC_FLAG_SUM_GOOD) {
+ brcmf_dbg(BCDC, "%s: BDC rcv, good checksum, flags 0x%x\n",
+ brcmf_ifname(drvr, tmp_if->ifidx), h->flags);
+ pktbuf->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ pktbuf->priority = h->priority & BCDC_PRIORITY_MASK;
+
+ skb_pull(pktbuf, BCDC_HEADER_LEN);
+ if (do_fws)
+ brcmf_fws_hdrpull(tmp_if, h->data_offset << 2, pktbuf);
+ else
+ skb_pull(pktbuf, h->data_offset << 2);
+
+ if (pktbuf->len == 0)
+ return -ENODATA;
+
+ *ifp = tmp_if;
+ return 0;
+}
+
+static int
+brcmf_proto_bcdc_txdata(struct brcmf_pub *drvr, int ifidx, u8 offset,
+ struct sk_buff *pktbuf)
+{
+ brcmf_proto_bcdc_hdrpush(drvr, ifidx, offset, pktbuf);
+ return brcmf_bus_txdata(drvr->bus_if, pktbuf);
+}
+
+static void
+brcmf_proto_bcdc_configure_addr_mode(struct brcmf_pub *drvr, int ifidx,
+ enum proto_addr_mode addr_mode)
+{
+}
+
+static void
+brcmf_proto_bcdc_delete_peer(struct brcmf_pub *drvr, int ifidx,
+ u8 peer[ETH_ALEN])
+{
+}
+
+static void
+brcmf_proto_bcdc_add_tdls_peer(struct brcmf_pub *drvr, int ifidx,
+ u8 peer[ETH_ALEN])
+{
+}
+
+int brcmf_proto_bcdc_attach(struct brcmf_pub *drvr)
+{
+ struct brcmf_bcdc *bcdc;
+
+ bcdc = kzalloc(sizeof(*bcdc), GFP_ATOMIC);
+ if (!bcdc)
+ goto fail;
+
+ /* ensure that the msg buf directly follows the cdc msg struct */
+ if ((unsigned long)(&bcdc->msg + 1) != (unsigned long)bcdc->buf) {
+ brcmf_err("struct brcmf_proto_bcdc is not correctly defined\n");
+ goto fail;
+ }
+
+ drvr->proto->hdrpull = brcmf_proto_bcdc_hdrpull;
+ drvr->proto->query_dcmd = brcmf_proto_bcdc_query_dcmd;
+ drvr->proto->set_dcmd = brcmf_proto_bcdc_set_dcmd;
+ drvr->proto->txdata = brcmf_proto_bcdc_txdata;
+ drvr->proto->configure_addr_mode = brcmf_proto_bcdc_configure_addr_mode;
+ drvr->proto->delete_peer = brcmf_proto_bcdc_delete_peer;
+ drvr->proto->add_tdls_peer = brcmf_proto_bcdc_add_tdls_peer;
+ drvr->proto->pd = bcdc;
+
+ drvr->hdrlen += BCDC_HEADER_LEN + BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES;
+ drvr->bus_if->maxctl = BRCMF_DCMD_MAXLEN +
+ sizeof(struct brcmf_proto_bcdc_dcmd);
+ return 0;
+
+fail:
+ kfree(bcdc);
+ return -ENOMEM;
+}
+
+void brcmf_proto_bcdc_detach(struct brcmf_pub *drvr)
+{
+ kfree(drvr->proto->pd);
+ drvr->proto->pd = NULL;
+}