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path: root/drivers/net/wireless/brcm80211/brcmfmac/dhd_cdc.c
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Diffstat (limited to 'drivers/net/wireless/brcm80211/brcmfmac/dhd_cdc.c')
-rw-r--r--drivers/net/wireless/brcm80211/brcmfmac/dhd_cdc.c498
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 00000000000..e34c5c3d1d5
--- /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 */
+}