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/*
* 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 "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 2 /* 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 data_offset;
};
#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.
*/
#define ROUND_UP_MARGIN 2048 /* Biggest bus block size possible for
* round off at the end of buffer
* Currently is SDIO
*/
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_bus_txctl(drvr->bus_if, (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");
len += sizeof(struct brcmf_proto_cdc_dcmd);
do {
ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&prot->msg,
len);
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_err("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_err("%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_err("%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;
}
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->data_offset = 0;
BDC_SET_IF_IDX(h, ifidx);
}
int brcmf_proto_hdrpull(struct brcmf_pub *drvr, u8 *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_err("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_err("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_err("%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);
skb_pull(pktbuf, h->data_offset << 2);
if (pktbuf->len == 0)
return -ENODATA;
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_err("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;
}
void brcmf_proto_stop(struct brcmf_pub *drvr)
{
/* Nothing to do for CDC */
}
|