493 lines
12 KiB
C
493 lines
12 KiB
C
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/*
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* Copyright (c) 2010 Broadcom Corporation
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*******************************************************************************
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* Communicates with the dongle by using dcmd codes.
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* For certain dcmd codes, the dongle interprets string data from the host.
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******************************************************************************/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/netdevice.h>
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#include <linux/sched.h>
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#include <defs.h>
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#include <brcmu_utils.h>
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#include <brcmu_wifi.h>
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#include "dhd.h"
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#include "dhd_proto.h"
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#include "dhd_bus.h"
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#include "dhd_dbg.h"
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struct brcmf_proto_cdc_dcmd {
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__le32 cmd; /* dongle command value */
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__le32 len; /* lower 16: output buflen;
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* upper 16: input buflen (excludes header) */
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__le32 flags; /* flag defns given below */
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__le32 status; /* status code returned from the device */
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};
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/* Max valid buffer size that can be sent to the dongle */
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#define CDC_MAX_MSG_SIZE (ETH_FRAME_LEN+ETH_FCS_LEN)
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/* CDC flag definitions */
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#define CDC_DCMD_ERROR 0x01 /* 1=cmd failed */
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#define CDC_DCMD_SET 0x02 /* 0=get, 1=set cmd */
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#define CDC_DCMD_IF_MASK 0xF000 /* I/F index */
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#define CDC_DCMD_IF_SHIFT 12
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#define CDC_DCMD_ID_MASK 0xFFFF0000 /* id an cmd pairing */
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#define CDC_DCMD_ID_SHIFT 16 /* ID Mask shift bits */
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#define CDC_DCMD_ID(flags) \
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(((flags) & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT)
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/*
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* BDC header - Broadcom specific extension of CDC.
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* Used on data packets to convey priority across USB.
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*/
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#define BDC_HEADER_LEN 4
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#define BDC_PROTO_VER 2 /* Protocol version */
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#define BDC_FLAG_VER_MASK 0xf0 /* Protocol version mask */
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#define BDC_FLAG_VER_SHIFT 4 /* Protocol version shift */
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#define BDC_FLAG_SUM_GOOD 0x04 /* Good RX checksums */
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#define BDC_FLAG_SUM_NEEDED 0x08 /* Dongle needs to do TX checksums */
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#define BDC_PRIORITY_MASK 0x7
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#define BDC_FLAG2_IF_MASK 0x0f /* packet rx interface in APSTA */
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#define BDC_FLAG2_IF_SHIFT 0
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#define BDC_GET_IF_IDX(hdr) \
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((int)((((hdr)->flags2) & BDC_FLAG2_IF_MASK) >> BDC_FLAG2_IF_SHIFT))
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#define BDC_SET_IF_IDX(hdr, idx) \
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((hdr)->flags2 = (((hdr)->flags2 & ~BDC_FLAG2_IF_MASK) | \
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((idx) << BDC_FLAG2_IF_SHIFT)))
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struct brcmf_proto_bdc_header {
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u8 flags;
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u8 priority; /* 802.1d Priority, 4:7 flow control info for usb */
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u8 flags2;
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u8 data_offset;
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};
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#define RETRIES 2 /* # of retries to retrieve matching dcmd response */
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#define BUS_HEADER_LEN (16+64) /* Must be atleast SDPCM_RESERVE
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* (amount of header tha might be added)
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* plus any space that might be needed
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* for bus alignment padding.
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*/
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#define ROUND_UP_MARGIN 2048 /* Biggest bus block size possible for
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* round off at the end of buffer
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* Currently is SDIO
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*/
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struct brcmf_proto {
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u16 reqid;
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u8 pending;
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u32 lastcmd;
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u8 bus_header[BUS_HEADER_LEN];
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struct brcmf_proto_cdc_dcmd msg;
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unsigned char buf[BRCMF_DCMD_MAXLEN + ROUND_UP_MARGIN];
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};
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static int brcmf_proto_cdc_msg(struct brcmf_pub *drvr)
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{
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struct brcmf_proto *prot = drvr->prot;
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int len = le32_to_cpu(prot->msg.len) +
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sizeof(struct brcmf_proto_cdc_dcmd);
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brcmf_dbg(TRACE, "Enter\n");
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/* NOTE : cdc->msg.len holds the desired length of the buffer to be
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* returned. Only up to CDC_MAX_MSG_SIZE of this buffer area
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* is actually sent to the dongle
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*/
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if (len > CDC_MAX_MSG_SIZE)
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len = CDC_MAX_MSG_SIZE;
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/* Send request */
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return drvr->bus_if->brcmf_bus_txctl(drvr->dev,
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(unsigned char *)&prot->msg,
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len);
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}
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static int brcmf_proto_cdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
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{
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int ret;
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struct brcmf_proto *prot = drvr->prot;
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brcmf_dbg(TRACE, "Enter\n");
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do {
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ret = drvr->bus_if->brcmf_bus_rxctl(drvr->dev,
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(unsigned char *)&prot->msg,
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len + sizeof(struct brcmf_proto_cdc_dcmd));
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if (ret < 0)
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break;
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} while (CDC_DCMD_ID(le32_to_cpu(prot->msg.flags)) != id);
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return ret;
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}
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int
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brcmf_proto_cdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
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void *buf, uint len)
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{
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struct brcmf_proto *prot = drvr->prot;
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struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
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void *info;
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int ret = 0, retries = 0;
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u32 id, flags;
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brcmf_dbg(TRACE, "Enter\n");
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brcmf_dbg(CTL, "cmd %d len %d\n", cmd, len);
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/* Respond "bcmerror" and "bcmerrorstr" with local cache */
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if (cmd == BRCMF_C_GET_VAR && buf) {
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if (!strcmp((char *)buf, "bcmerrorstr")) {
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strncpy((char *)buf, "bcm_error",
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BCME_STRLEN);
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goto done;
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} else if (!strcmp((char *)buf, "bcmerror")) {
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*(int *)buf = drvr->dongle_error;
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goto done;
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}
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}
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memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
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msg->cmd = cpu_to_le32(cmd);
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msg->len = cpu_to_le32(len);
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flags = (++prot->reqid << CDC_DCMD_ID_SHIFT);
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flags = (flags & ~CDC_DCMD_IF_MASK) |
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(ifidx << CDC_DCMD_IF_SHIFT);
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msg->flags = cpu_to_le32(flags);
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if (buf)
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memcpy(prot->buf, buf, len);
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ret = brcmf_proto_cdc_msg(drvr);
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if (ret < 0) {
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brcmf_dbg(ERROR, "brcmf_proto_cdc_msg failed w/status %d\n",
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ret);
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goto done;
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}
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retry:
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/* wait for interrupt and get first fragment */
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ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
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if (ret < 0)
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goto done;
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flags = le32_to_cpu(msg->flags);
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id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
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if ((id < prot->reqid) && (++retries < RETRIES))
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goto retry;
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if (id != prot->reqid) {
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brcmf_dbg(ERROR, "%s: unexpected request id %d (expected %d)\n",
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brcmf_ifname(drvr, ifidx), id, prot->reqid);
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ret = -EINVAL;
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goto done;
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}
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/* Check info buffer */
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info = (void *)&msg[1];
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/* Copy info buffer */
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if (buf) {
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if (ret < (int)len)
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len = ret;
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memcpy(buf, info, len);
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}
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/* Check the ERROR flag */
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if (flags & CDC_DCMD_ERROR) {
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ret = le32_to_cpu(msg->status);
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/* Cache error from dongle */
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drvr->dongle_error = ret;
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}
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done:
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return ret;
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}
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int brcmf_proto_cdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
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void *buf, uint len)
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{
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struct brcmf_proto *prot = drvr->prot;
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struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
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int ret = 0;
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u32 flags, id;
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brcmf_dbg(TRACE, "Enter\n");
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brcmf_dbg(CTL, "cmd %d len %d\n", cmd, len);
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memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
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msg->cmd = cpu_to_le32(cmd);
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msg->len = cpu_to_le32(len);
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flags = (++prot->reqid << CDC_DCMD_ID_SHIFT) | CDC_DCMD_SET;
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flags = (flags & ~CDC_DCMD_IF_MASK) |
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(ifidx << CDC_DCMD_IF_SHIFT);
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msg->flags = cpu_to_le32(flags);
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if (buf)
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memcpy(prot->buf, buf, len);
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ret = brcmf_proto_cdc_msg(drvr);
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if (ret < 0)
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goto done;
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ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
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if (ret < 0)
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goto done;
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flags = le32_to_cpu(msg->flags);
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id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
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if (id != prot->reqid) {
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brcmf_dbg(ERROR, "%s: unexpected request id %d (expected %d)\n",
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brcmf_ifname(drvr, ifidx), id, prot->reqid);
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ret = -EINVAL;
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goto done;
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}
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/* Check the ERROR flag */
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if (flags & CDC_DCMD_ERROR) {
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ret = le32_to_cpu(msg->status);
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/* Cache error from dongle */
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drvr->dongle_error = ret;
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}
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done:
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return ret;
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}
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int
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brcmf_proto_dcmd(struct brcmf_pub *drvr, int ifidx, struct brcmf_dcmd *dcmd,
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int len)
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{
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struct brcmf_proto *prot = drvr->prot;
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int ret = -1;
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if (drvr->bus_if->state == BRCMF_BUS_DOWN) {
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brcmf_dbg(ERROR, "bus is down. we have nothing to do.\n");
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return ret;
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}
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mutex_lock(&drvr->proto_block);
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brcmf_dbg(TRACE, "Enter\n");
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if (len > BRCMF_DCMD_MAXLEN)
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goto done;
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if (prot->pending == true) {
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brcmf_dbg(TRACE, "CDC packet is pending!!!! cmd=0x%x (%lu) lastcmd=0x%x (%lu)\n",
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dcmd->cmd, (unsigned long)dcmd->cmd, prot->lastcmd,
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(unsigned long)prot->lastcmd);
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if (dcmd->cmd == BRCMF_C_SET_VAR ||
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dcmd->cmd == BRCMF_C_GET_VAR)
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brcmf_dbg(TRACE, "iovar cmd=%s\n", (char *)dcmd->buf);
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goto done;
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}
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prot->pending = true;
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prot->lastcmd = dcmd->cmd;
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if (dcmd->set)
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ret = brcmf_proto_cdc_set_dcmd(drvr, ifidx, dcmd->cmd,
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dcmd->buf, len);
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else {
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ret = brcmf_proto_cdc_query_dcmd(drvr, ifidx, dcmd->cmd,
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dcmd->buf, len);
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if (ret > 0)
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dcmd->used = ret -
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sizeof(struct brcmf_proto_cdc_dcmd);
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}
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if (ret >= 0)
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ret = 0;
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else {
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struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
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/* len == needed when set/query fails from dongle */
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dcmd->needed = le32_to_cpu(msg->len);
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}
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/* Intercept the wme_dp dongle cmd here */
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if (!ret && dcmd->cmd == BRCMF_C_SET_VAR &&
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!strcmp(dcmd->buf, "wme_dp")) {
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int slen;
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__le32 val = 0;
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slen = strlen("wme_dp") + 1;
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if (len >= (int)(slen + sizeof(int)))
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memcpy(&val, (char *)dcmd->buf + slen, sizeof(int));
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drvr->wme_dp = (u8) le32_to_cpu(val);
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}
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prot->pending = false;
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done:
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mutex_unlock(&drvr->proto_block);
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return ret;
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}
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static bool pkt_sum_needed(struct sk_buff *skb)
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{
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return skb->ip_summed == CHECKSUM_PARTIAL;
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}
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static void pkt_set_sum_good(struct sk_buff *skb, bool x)
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{
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skb->ip_summed = (x ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
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}
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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->data_offset = 0;
|
||
|
|
BDC_SET_IF_IDX(h, ifidx);
|
||
|
|
}
|
||
|
|
|
||
|
|
int brcmf_proto_hdrpull(struct device *dev, int *ifidx,
|
||
|
|
struct sk_buff *pktbuf)
|
||
|
|
{
|
||
|
|
struct brcmf_proto_bdc_header *h;
|
||
|
|
struct brcmf_bus *bus_if = dev_get_drvdata(dev);
|
||
|
|
struct brcmf_pub *drvr = bus_if->drvr;
|
||
|
|
|
||
|
|
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->bus_if->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;
|
||
|
|
}
|
||
|
|
|
||
|
|
int brcmf_proto_init(struct brcmf_pub *drvr)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
char buf[128];
|
||
|
|
|
||
|
|
brcmf_dbg(TRACE, "Enter\n");
|
||
|
|
|
||
|
|
mutex_lock(&drvr->proto_block);
|
||
|
|
|
||
|
|
/* 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) {
|
||
|
|
mutex_unlock(&drvr->proto_block);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
memcpy(drvr->mac, buf, ETH_ALEN);
|
||
|
|
|
||
|
|
mutex_unlock(&drvr->proto_block);
|
||
|
|
|
||
|
|
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 */
|
||
|
|
}
|