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![Colin Ian King](/assets/img/avatar_default.png)
Trivial fix to spelling mistake in dev_err error message text. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
1202 lines
30 KiB
C
1202 lines
30 KiB
C
/*
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* ssi_protocol.c
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*
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* Implementation of the SSI McSAAB improved protocol.
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*
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* Copyright (C) 2010 Nokia Corporation. All rights reserved.
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* Copyright (C) 2013 Sebastian Reichel <sre@kernel.org>
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*
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* Contact: Carlos Chinea <carlos.chinea@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/atomic.h>
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/if_ether.h>
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#include <linux/if_arp.h>
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#include <linux/if_phonet.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/notifier.h>
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#include <linux/scatterlist.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/hsi/hsi.h>
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#include <linux/hsi/ssi_protocol.h>
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void ssi_waketest(struct hsi_client *cl, unsigned int enable);
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#define SSIP_TXQUEUE_LEN 100
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#define SSIP_MAX_MTU 65535
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#define SSIP_DEFAULT_MTU 4000
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#define PN_MEDIA_SOS 21
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#define SSIP_MIN_PN_HDR 6 /* FIXME: Revisit */
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#define SSIP_WDTOUT 2000 /* FIXME: has to be 500 msecs */
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#define SSIP_KATOUT 15 /* 15 msecs */
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#define SSIP_MAX_CMDS 5 /* Number of pre-allocated commands buffers */
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#define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
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#define SSIP_CMT_LOADER_SYNC 0x11223344
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/*
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* SSI protocol command definitions
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*/
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#define SSIP_COMMAND(data) ((data) >> 28)
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#define SSIP_PAYLOAD(data) ((data) & 0xfffffff)
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/* Commands */
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#define SSIP_SW_BREAK 0
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#define SSIP_BOOTINFO_REQ 1
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#define SSIP_BOOTINFO_RESP 2
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#define SSIP_WAKETEST_RESULT 3
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#define SSIP_START_TRANS 4
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#define SSIP_READY 5
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/* Payloads */
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#define SSIP_DATA_VERSION(data) ((data) & 0xff)
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#define SSIP_LOCAL_VERID 1
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#define SSIP_WAKETEST_OK 0
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#define SSIP_WAKETEST_FAILED 1
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#define SSIP_PDU_LENGTH(data) (((data) >> 8) & 0xffff)
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#define SSIP_MSG_ID(data) ((data) & 0xff)
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/* Generic Command */
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#define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff))
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/* Commands for the control channel */
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#define SSIP_BOOTINFO_REQ_CMD(ver) \
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SSIP_CMD(SSIP_BOOTINFO_REQ, SSIP_DATA_VERSION(ver))
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#define SSIP_BOOTINFO_RESP_CMD(ver) \
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SSIP_CMD(SSIP_BOOTINFO_RESP, SSIP_DATA_VERSION(ver))
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#define SSIP_START_TRANS_CMD(pdulen, id) \
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SSIP_CMD(SSIP_START_TRANS, (((pdulen) << 8) | SSIP_MSG_ID(id)))
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#define SSIP_READY_CMD SSIP_CMD(SSIP_READY, 0)
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#define SSIP_SWBREAK_CMD SSIP_CMD(SSIP_SW_BREAK, 0)
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#define SSIP_WAKETEST_FLAG 0
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/* Main state machine states */
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enum {
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INIT,
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HANDSHAKE,
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ACTIVE,
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};
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/* Send state machine states */
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enum {
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SEND_IDLE,
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WAIT4READY,
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SEND_READY,
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SENDING,
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SENDING_SWBREAK,
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};
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/* Receive state machine states */
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enum {
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RECV_IDLE,
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RECV_READY,
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RECEIVING,
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};
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/**
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* struct ssi_protocol - SSI protocol (McSAAB) data
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* @main_state: Main state machine
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* @send_state: TX state machine
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* @recv_state: RX state machine
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* @flags: Flags, currently only used to follow wake line test
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* @rxid: RX data id
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* @txid: TX data id
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* @txqueue_len: TX queue length
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* @tx_wd: TX watchdog
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* @rx_wd: RX watchdog
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* @keep_alive: Workaround for SSI HW bug
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* @lock: To serialize access to this struct
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* @netdev: Phonet network device
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* @txqueue: TX data queue
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* @cmdqueue: Queue of free commands
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* @cl: HSI client own reference
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* @link: Link for ssip_list
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* @tx_usecount: Refcount to keep track the slaves that use the wake line
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* @channel_id_cmd: HSI channel id for command stream
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* @channel_id_data: HSI channel id for data stream
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*/
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struct ssi_protocol {
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unsigned int main_state;
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unsigned int send_state;
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unsigned int recv_state;
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unsigned long flags;
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u8 rxid;
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u8 txid;
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unsigned int txqueue_len;
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struct timer_list tx_wd;
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struct timer_list rx_wd;
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struct timer_list keep_alive; /* wake-up workaround */
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spinlock_t lock;
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struct net_device *netdev;
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struct list_head txqueue;
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struct list_head cmdqueue;
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struct work_struct work;
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struct hsi_client *cl;
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struct list_head link;
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atomic_t tx_usecnt;
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int channel_id_cmd;
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int channel_id_data;
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};
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/* List of ssi protocol instances */
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static LIST_HEAD(ssip_list);
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static void ssip_rxcmd_complete(struct hsi_msg *msg);
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static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd)
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{
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u32 *data;
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data = sg_virt(msg->sgt.sgl);
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*data = cmd;
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}
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static inline u32 ssip_get_cmd(struct hsi_msg *msg)
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{
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u32 *data;
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data = sg_virt(msg->sgt.sgl);
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return *data;
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}
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static void ssip_skb_to_msg(struct sk_buff *skb, struct hsi_msg *msg)
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{
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skb_frag_t *frag;
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struct scatterlist *sg;
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int i;
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BUG_ON(msg->sgt.nents != (unsigned int)(skb_shinfo(skb)->nr_frags + 1));
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sg = msg->sgt.sgl;
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sg_set_buf(sg, skb->data, skb_headlen(skb));
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for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
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sg = sg_next(sg);
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BUG_ON(!sg);
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frag = &skb_shinfo(skb)->frags[i];
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sg_set_page(sg, frag->page.p, frag->size, frag->page_offset);
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}
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}
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static void ssip_free_data(struct hsi_msg *msg)
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{
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struct sk_buff *skb;
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skb = msg->context;
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pr_debug("free data: msg %p context %p skb %p\n", msg, msg->context,
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skb);
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msg->destructor = NULL;
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dev_kfree_skb(skb);
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hsi_free_msg(msg);
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}
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static struct hsi_msg *ssip_alloc_data(struct ssi_protocol *ssi,
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struct sk_buff *skb, gfp_t flags)
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{
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struct hsi_msg *msg;
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msg = hsi_alloc_msg(skb_shinfo(skb)->nr_frags + 1, flags);
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if (!msg)
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return NULL;
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ssip_skb_to_msg(skb, msg);
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msg->destructor = ssip_free_data;
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msg->channel = ssi->channel_id_data;
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msg->context = skb;
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return msg;
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}
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static inline void ssip_release_cmd(struct hsi_msg *msg)
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{
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struct ssi_protocol *ssi = hsi_client_drvdata(msg->cl);
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dev_dbg(&msg->cl->device, "Release cmd 0x%08x\n", ssip_get_cmd(msg));
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spin_lock_bh(&ssi->lock);
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list_add_tail(&msg->link, &ssi->cmdqueue);
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spin_unlock_bh(&ssi->lock);
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}
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static struct hsi_msg *ssip_claim_cmd(struct ssi_protocol *ssi)
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{
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struct hsi_msg *msg;
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BUG_ON(list_empty(&ssi->cmdqueue));
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spin_lock_bh(&ssi->lock);
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msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link);
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list_del(&msg->link);
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spin_unlock_bh(&ssi->lock);
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msg->destructor = ssip_release_cmd;
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return msg;
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}
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static void ssip_free_cmds(struct ssi_protocol *ssi)
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{
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struct hsi_msg *msg, *tmp;
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list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) {
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list_del(&msg->link);
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msg->destructor = NULL;
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kfree(sg_virt(msg->sgt.sgl));
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hsi_free_msg(msg);
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}
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}
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static int ssip_alloc_cmds(struct ssi_protocol *ssi)
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{
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struct hsi_msg *msg;
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u32 *buf;
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unsigned int i;
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for (i = 0; i < SSIP_MAX_CMDS; i++) {
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msg = hsi_alloc_msg(1, GFP_KERNEL);
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if (!msg)
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goto out;
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buf = kmalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf) {
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hsi_free_msg(msg);
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goto out;
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}
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sg_init_one(msg->sgt.sgl, buf, sizeof(*buf));
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msg->channel = ssi->channel_id_cmd;
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list_add_tail(&msg->link, &ssi->cmdqueue);
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}
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return 0;
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out:
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ssip_free_cmds(ssi);
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return -ENOMEM;
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}
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static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state)
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{
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ssi->recv_state = state;
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switch (state) {
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case RECV_IDLE:
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del_timer(&ssi->rx_wd);
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if (ssi->send_state == SEND_IDLE)
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del_timer(&ssi->keep_alive);
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break;
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case RECV_READY:
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/* CMT speech workaround */
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if (atomic_read(&ssi->tx_usecnt))
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break;
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/* Otherwise fall through */
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case RECEIVING:
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mod_timer(&ssi->keep_alive, jiffies +
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msecs_to_jiffies(SSIP_KATOUT));
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mod_timer(&ssi->rx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
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break;
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default:
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break;
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}
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}
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static void ssip_set_txstate(struct ssi_protocol *ssi, unsigned int state)
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{
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ssi->send_state = state;
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switch (state) {
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case SEND_IDLE:
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case SEND_READY:
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del_timer(&ssi->tx_wd);
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if (ssi->recv_state == RECV_IDLE)
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del_timer(&ssi->keep_alive);
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break;
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case WAIT4READY:
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case SENDING:
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case SENDING_SWBREAK:
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mod_timer(&ssi->keep_alive,
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jiffies + msecs_to_jiffies(SSIP_KATOUT));
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mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
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break;
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default:
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break;
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}
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}
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struct hsi_client *ssip_slave_get_master(struct hsi_client *slave)
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{
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struct hsi_client *master = ERR_PTR(-ENODEV);
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struct ssi_protocol *ssi;
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list_for_each_entry(ssi, &ssip_list, link)
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if (slave->device.parent == ssi->cl->device.parent) {
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master = ssi->cl;
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break;
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}
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return master;
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}
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EXPORT_SYMBOL_GPL(ssip_slave_get_master);
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int ssip_slave_start_tx(struct hsi_client *master)
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{
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struct ssi_protocol *ssi = hsi_client_drvdata(master);
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dev_dbg(&master->device, "start TX %d\n", atomic_read(&ssi->tx_usecnt));
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spin_lock_bh(&ssi->lock);
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if (ssi->send_state == SEND_IDLE) {
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ssip_set_txstate(ssi, WAIT4READY);
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hsi_start_tx(master);
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}
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spin_unlock_bh(&ssi->lock);
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atomic_inc(&ssi->tx_usecnt);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ssip_slave_start_tx);
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int ssip_slave_stop_tx(struct hsi_client *master)
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{
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struct ssi_protocol *ssi = hsi_client_drvdata(master);
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WARN_ON_ONCE(atomic_read(&ssi->tx_usecnt) == 0);
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if (atomic_dec_and_test(&ssi->tx_usecnt)) {
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spin_lock_bh(&ssi->lock);
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if ((ssi->send_state == SEND_READY) ||
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(ssi->send_state == WAIT4READY)) {
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ssip_set_txstate(ssi, SEND_IDLE);
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hsi_stop_tx(master);
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}
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spin_unlock_bh(&ssi->lock);
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}
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dev_dbg(&master->device, "stop TX %d\n", atomic_read(&ssi->tx_usecnt));
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return 0;
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}
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EXPORT_SYMBOL_GPL(ssip_slave_stop_tx);
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int ssip_slave_running(struct hsi_client *master)
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{
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struct ssi_protocol *ssi = hsi_client_drvdata(master);
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return netif_running(ssi->netdev);
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}
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EXPORT_SYMBOL_GPL(ssip_slave_running);
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static void ssip_reset(struct hsi_client *cl)
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{
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struct ssi_protocol *ssi = hsi_client_drvdata(cl);
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struct list_head *head, *tmp;
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struct hsi_msg *msg;
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if (netif_running(ssi->netdev))
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netif_carrier_off(ssi->netdev);
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hsi_flush(cl);
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spin_lock_bh(&ssi->lock);
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if (ssi->send_state != SEND_IDLE)
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hsi_stop_tx(cl);
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spin_unlock_bh(&ssi->lock);
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if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
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ssi_waketest(cl, 0); /* FIXME: To be removed */
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spin_lock_bh(&ssi->lock);
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del_timer(&ssi->rx_wd);
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del_timer(&ssi->tx_wd);
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del_timer(&ssi->keep_alive);
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ssi->main_state = 0;
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ssi->send_state = 0;
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ssi->recv_state = 0;
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ssi->flags = 0;
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ssi->rxid = 0;
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ssi->txid = 0;
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list_for_each_safe(head, tmp, &ssi->txqueue) {
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msg = list_entry(head, struct hsi_msg, link);
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dev_dbg(&cl->device, "Pending TX data\n");
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list_del(head);
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ssip_free_data(msg);
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}
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ssi->txqueue_len = 0;
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spin_unlock_bh(&ssi->lock);
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}
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static void ssip_dump_state(struct hsi_client *cl)
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{
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struct ssi_protocol *ssi = hsi_client_drvdata(cl);
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struct hsi_msg *msg;
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spin_lock_bh(&ssi->lock);
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dev_err(&cl->device, "Main state: %d\n", ssi->main_state);
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dev_err(&cl->device, "Recv state: %d\n", ssi->recv_state);
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dev_err(&cl->device, "Send state: %d\n", ssi->send_state);
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dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ?
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"Online" : "Offline");
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dev_err(&cl->device, "Wake test %d\n",
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test_bit(SSIP_WAKETEST_FLAG, &ssi->flags));
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dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid);
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dev_err(&cl->device, "Data TX id: %d\n", ssi->txid);
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list_for_each_entry(msg, &ssi->txqueue, link)
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dev_err(&cl->device, "pending TX data (%p)\n", msg);
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spin_unlock_bh(&ssi->lock);
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}
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|
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static void ssip_error(struct hsi_client *cl)
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{
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struct ssi_protocol *ssi = hsi_client_drvdata(cl);
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struct hsi_msg *msg;
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|
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ssip_dump_state(cl);
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ssip_reset(cl);
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msg = ssip_claim_cmd(ssi);
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msg->complete = ssip_rxcmd_complete;
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hsi_async_read(cl, msg);
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}
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|
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static void ssip_keep_alive(struct timer_list *t)
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{
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struct ssi_protocol *ssi = from_timer(ssi, t, keep_alive);
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struct hsi_client *cl = ssi->cl;
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|
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dev_dbg(&cl->device, "Keep alive kick in: m(%d) r(%d) s(%d)\n",
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ssi->main_state, ssi->recv_state, ssi->send_state);
|
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|
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spin_lock(&ssi->lock);
|
|
if (ssi->recv_state == RECV_IDLE)
|
|
switch (ssi->send_state) {
|
|
case SEND_READY:
|
|
if (atomic_read(&ssi->tx_usecnt) == 0)
|
|
break;
|
|
/*
|
|
* Fall through. Workaround for cmt-speech
|
|
* in that case we relay on audio timers.
|
|
*/
|
|
case SEND_IDLE:
|
|
spin_unlock(&ssi->lock);
|
|
return;
|
|
}
|
|
mod_timer(&ssi->keep_alive, jiffies + msecs_to_jiffies(SSIP_KATOUT));
|
|
spin_unlock(&ssi->lock);
|
|
}
|
|
|
|
static void ssip_rx_wd(struct timer_list *t)
|
|
{
|
|
struct ssi_protocol *ssi = from_timer(ssi, t, rx_wd);
|
|
struct hsi_client *cl = ssi->cl;
|
|
|
|
dev_err(&cl->device, "Watchdog triggered\n");
|
|
ssip_error(cl);
|
|
}
|
|
|
|
static void ssip_tx_wd(struct timer_list *t)
|
|
{
|
|
struct ssi_protocol *ssi = from_timer(ssi, t, tx_wd);
|
|
struct hsi_client *cl = ssi->cl;
|
|
|
|
dev_err(&cl->device, "Watchdog triggered\n");
|
|
ssip_error(cl);
|
|
}
|
|
|
|
static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct hsi_msg *msg;
|
|
|
|
dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n");
|
|
msg = ssip_claim_cmd(ssi);
|
|
ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID));
|
|
msg->complete = ssip_release_cmd;
|
|
hsi_async_write(cl, msg);
|
|
dev_dbg(&cl->device, "Issuing RX command\n");
|
|
msg = ssip_claim_cmd(ssi);
|
|
msg->complete = ssip_rxcmd_complete;
|
|
hsi_async_read(cl, msg);
|
|
}
|
|
|
|
static void ssip_start_rx(struct hsi_client *cl)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct hsi_msg *msg;
|
|
|
|
dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state,
|
|
ssi->recv_state);
|
|
spin_lock_bh(&ssi->lock);
|
|
/*
|
|
* We can have two UP events in a row due to a short low
|
|
* high transition. Therefore we need to ignore the sencond UP event.
|
|
*/
|
|
if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) {
|
|
spin_unlock_bh(&ssi->lock);
|
|
return;
|
|
}
|
|
ssip_set_rxstate(ssi, RECV_READY);
|
|
spin_unlock_bh(&ssi->lock);
|
|
|
|
msg = ssip_claim_cmd(ssi);
|
|
ssip_set_cmd(msg, SSIP_READY_CMD);
|
|
msg->complete = ssip_release_cmd;
|
|
dev_dbg(&cl->device, "Send READY\n");
|
|
hsi_async_write(cl, msg);
|
|
}
|
|
|
|
static void ssip_stop_rx(struct hsi_client *cl)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
|
|
dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state);
|
|
spin_lock_bh(&ssi->lock);
|
|
if (likely(ssi->main_state == ACTIVE))
|
|
ssip_set_rxstate(ssi, RECV_IDLE);
|
|
spin_unlock_bh(&ssi->lock);
|
|
}
|
|
|
|
static void ssip_free_strans(struct hsi_msg *msg)
|
|
{
|
|
ssip_free_data(msg->context);
|
|
ssip_release_cmd(msg);
|
|
}
|
|
|
|
static void ssip_strans_complete(struct hsi_msg *msg)
|
|
{
|
|
struct hsi_client *cl = msg->cl;
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct hsi_msg *data;
|
|
|
|
data = msg->context;
|
|
ssip_release_cmd(msg);
|
|
spin_lock_bh(&ssi->lock);
|
|
ssip_set_txstate(ssi, SENDING);
|
|
spin_unlock_bh(&ssi->lock);
|
|
hsi_async_write(cl, data);
|
|
}
|
|
|
|
static int ssip_xmit(struct hsi_client *cl)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct hsi_msg *msg, *dmsg;
|
|
struct sk_buff *skb;
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
if (list_empty(&ssi->txqueue)) {
|
|
spin_unlock_bh(&ssi->lock);
|
|
return 0;
|
|
}
|
|
dmsg = list_first_entry(&ssi->txqueue, struct hsi_msg, link);
|
|
list_del(&dmsg->link);
|
|
ssi->txqueue_len--;
|
|
spin_unlock_bh(&ssi->lock);
|
|
|
|
msg = ssip_claim_cmd(ssi);
|
|
skb = dmsg->context;
|
|
msg->context = dmsg;
|
|
msg->complete = ssip_strans_complete;
|
|
msg->destructor = ssip_free_strans;
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
ssip_set_cmd(msg, SSIP_START_TRANS_CMD(SSIP_BYTES_TO_FRAMES(skb->len),
|
|
ssi->txid));
|
|
ssi->txid++;
|
|
ssip_set_txstate(ssi, SENDING);
|
|
spin_unlock_bh(&ssi->lock);
|
|
|
|
dev_dbg(&cl->device, "Send STRANS (%d frames)\n",
|
|
SSIP_BYTES_TO_FRAMES(skb->len));
|
|
|
|
return hsi_async_write(cl, msg);
|
|
}
|
|
|
|
/* In soft IRQ context */
|
|
static void ssip_pn_rx(struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
|
|
if (unlikely(!netif_running(dev))) {
|
|
dev_dbg(&dev->dev, "Drop RX packet\n");
|
|
dev->stats.rx_dropped++;
|
|
dev_kfree_skb(skb);
|
|
return;
|
|
}
|
|
if (unlikely(!pskb_may_pull(skb, SSIP_MIN_PN_HDR))) {
|
|
dev_dbg(&dev->dev, "Error drop RX packet\n");
|
|
dev->stats.rx_errors++;
|
|
dev->stats.rx_length_errors++;
|
|
dev_kfree_skb(skb);
|
|
return;
|
|
}
|
|
dev->stats.rx_packets++;
|
|
dev->stats.rx_bytes += skb->len;
|
|
|
|
/* length field is exchanged in network byte order */
|
|
((u16 *)skb->data)[2] = ntohs(((u16 *)skb->data)[2]);
|
|
dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n",
|
|
((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2]));
|
|
|
|
skb->protocol = htons(ETH_P_PHONET);
|
|
skb_reset_mac_header(skb);
|
|
__skb_pull(skb, 1);
|
|
netif_rx(skb);
|
|
}
|
|
|
|
static void ssip_rx_data_complete(struct hsi_msg *msg)
|
|
{
|
|
struct hsi_client *cl = msg->cl;
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct sk_buff *skb;
|
|
|
|
if (msg->status == HSI_STATUS_ERROR) {
|
|
dev_err(&cl->device, "RX data error\n");
|
|
ssip_free_data(msg);
|
|
ssip_error(cl);
|
|
return;
|
|
}
|
|
del_timer(&ssi->rx_wd); /* FIXME: Revisit */
|
|
skb = msg->context;
|
|
ssip_pn_rx(skb);
|
|
hsi_free_msg(msg);
|
|
}
|
|
|
|
static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct hsi_msg *msg;
|
|
|
|
/* Workaroud: Ignore CMT Loader message leftover */
|
|
if (cmd == SSIP_CMT_LOADER_SYNC)
|
|
return;
|
|
|
|
switch (ssi->main_state) {
|
|
case ACTIVE:
|
|
dev_err(&cl->device, "Boot info req on active state\n");
|
|
ssip_error(cl);
|
|
/* Fall through */
|
|
case INIT:
|
|
case HANDSHAKE:
|
|
spin_lock_bh(&ssi->lock);
|
|
ssi->main_state = HANDSHAKE;
|
|
spin_unlock_bh(&ssi->lock);
|
|
|
|
if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
|
|
ssi_waketest(cl, 1); /* FIXME: To be removed */
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
/* Start boot handshake watchdog */
|
|
mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
|
|
spin_unlock_bh(&ssi->lock);
|
|
dev_dbg(&cl->device, "Send BOOTINFO_RESP\n");
|
|
if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
|
|
dev_warn(&cl->device, "boot info req verid mismatch\n");
|
|
msg = ssip_claim_cmd(ssi);
|
|
ssip_set_cmd(msg, SSIP_BOOTINFO_RESP_CMD(SSIP_LOCAL_VERID));
|
|
msg->complete = ssip_release_cmd;
|
|
hsi_async_write(cl, msg);
|
|
break;
|
|
default:
|
|
dev_dbg(&cl->device, "Wrong state M(%d)\n", ssi->main_state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
|
|
if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID)
|
|
dev_warn(&cl->device, "boot info resp verid mismatch\n");
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
if (ssi->main_state != ACTIVE)
|
|
/* Use tx_wd as a boot watchdog in non ACTIVE state */
|
|
mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT));
|
|
else
|
|
dev_dbg(&cl->device, "boot info resp ignored M(%d)\n",
|
|
ssi->main_state);
|
|
spin_unlock_bh(&ssi->lock);
|
|
}
|
|
|
|
static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
unsigned int wkres = SSIP_PAYLOAD(cmd);
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
if (ssi->main_state != HANDSHAKE) {
|
|
dev_dbg(&cl->device, "wake lines test ignored M(%d)\n",
|
|
ssi->main_state);
|
|
spin_unlock_bh(&ssi->lock);
|
|
return;
|
|
}
|
|
spin_unlock_bh(&ssi->lock);
|
|
|
|
if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
|
|
ssi_waketest(cl, 0); /* FIXME: To be removed */
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
ssi->main_state = ACTIVE;
|
|
del_timer(&ssi->tx_wd); /* Stop boot handshake timer */
|
|
spin_unlock_bh(&ssi->lock);
|
|
|
|
dev_notice(&cl->device, "WAKELINES TEST %s\n",
|
|
wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK");
|
|
if (wkres & SSIP_WAKETEST_FAILED) {
|
|
ssip_error(cl);
|
|
return;
|
|
}
|
|
dev_dbg(&cl->device, "CMT is ONLINE\n");
|
|
netif_wake_queue(ssi->netdev);
|
|
netif_carrier_on(ssi->netdev);
|
|
}
|
|
|
|
static void ssip_rx_ready(struct hsi_client *cl)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
if (unlikely(ssi->main_state != ACTIVE)) {
|
|
dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n",
|
|
ssi->send_state, ssi->main_state);
|
|
spin_unlock_bh(&ssi->lock);
|
|
return;
|
|
}
|
|
if (ssi->send_state != WAIT4READY) {
|
|
dev_dbg(&cl->device, "Ignore spurious READY command\n");
|
|
spin_unlock_bh(&ssi->lock);
|
|
return;
|
|
}
|
|
ssip_set_txstate(ssi, SEND_READY);
|
|
spin_unlock_bh(&ssi->lock);
|
|
ssip_xmit(cl);
|
|
}
|
|
|
|
static void ssip_rx_strans(struct hsi_client *cl, u32 cmd)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct sk_buff *skb;
|
|
struct hsi_msg *msg;
|
|
int len = SSIP_PDU_LENGTH(cmd);
|
|
|
|
dev_dbg(&cl->device, "RX strans: %d frames\n", len);
|
|
spin_lock_bh(&ssi->lock);
|
|
if (unlikely(ssi->main_state != ACTIVE)) {
|
|
dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n",
|
|
ssi->send_state, ssi->main_state);
|
|
spin_unlock_bh(&ssi->lock);
|
|
return;
|
|
}
|
|
ssip_set_rxstate(ssi, RECEIVING);
|
|
if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) {
|
|
dev_err(&cl->device, "START TRANS id %d expected %d\n",
|
|
SSIP_MSG_ID(cmd), ssi->rxid);
|
|
spin_unlock_bh(&ssi->lock);
|
|
goto out1;
|
|
}
|
|
ssi->rxid++;
|
|
spin_unlock_bh(&ssi->lock);
|
|
skb = netdev_alloc_skb(ssi->netdev, len * 4);
|
|
if (unlikely(!skb)) {
|
|
dev_err(&cl->device, "No memory for rx skb\n");
|
|
goto out1;
|
|
}
|
|
skb->dev = ssi->netdev;
|
|
skb_put(skb, len * 4);
|
|
msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
|
|
if (unlikely(!msg)) {
|
|
dev_err(&cl->device, "No memory for RX data msg\n");
|
|
goto out2;
|
|
}
|
|
msg->complete = ssip_rx_data_complete;
|
|
hsi_async_read(cl, msg);
|
|
|
|
return;
|
|
out2:
|
|
dev_kfree_skb(skb);
|
|
out1:
|
|
ssip_error(cl);
|
|
}
|
|
|
|
static void ssip_rxcmd_complete(struct hsi_msg *msg)
|
|
{
|
|
struct hsi_client *cl = msg->cl;
|
|
u32 cmd = ssip_get_cmd(msg);
|
|
unsigned int cmdid = SSIP_COMMAND(cmd);
|
|
|
|
if (msg->status == HSI_STATUS_ERROR) {
|
|
dev_err(&cl->device, "RX error detected\n");
|
|
ssip_release_cmd(msg);
|
|
ssip_error(cl);
|
|
return;
|
|
}
|
|
hsi_async_read(cl, msg);
|
|
dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd);
|
|
switch (cmdid) {
|
|
case SSIP_SW_BREAK:
|
|
/* Ignored */
|
|
break;
|
|
case SSIP_BOOTINFO_REQ:
|
|
ssip_rx_bootinforeq(cl, cmd);
|
|
break;
|
|
case SSIP_BOOTINFO_RESP:
|
|
ssip_rx_bootinforesp(cl, cmd);
|
|
break;
|
|
case SSIP_WAKETEST_RESULT:
|
|
ssip_rx_waketest(cl, cmd);
|
|
break;
|
|
case SSIP_START_TRANS:
|
|
ssip_rx_strans(cl, cmd);
|
|
break;
|
|
case SSIP_READY:
|
|
ssip_rx_ready(cl);
|
|
break;
|
|
default:
|
|
dev_warn(&cl->device, "command 0x%08x not supported\n", cmd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void ssip_swbreak_complete(struct hsi_msg *msg)
|
|
{
|
|
struct hsi_client *cl = msg->cl;
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
|
|
ssip_release_cmd(msg);
|
|
spin_lock_bh(&ssi->lock);
|
|
if (list_empty(&ssi->txqueue)) {
|
|
if (atomic_read(&ssi->tx_usecnt)) {
|
|
ssip_set_txstate(ssi, SEND_READY);
|
|
} else {
|
|
ssip_set_txstate(ssi, SEND_IDLE);
|
|
hsi_stop_tx(cl);
|
|
}
|
|
spin_unlock_bh(&ssi->lock);
|
|
} else {
|
|
spin_unlock_bh(&ssi->lock);
|
|
ssip_xmit(cl);
|
|
}
|
|
netif_wake_queue(ssi->netdev);
|
|
}
|
|
|
|
static void ssip_tx_data_complete(struct hsi_msg *msg)
|
|
{
|
|
struct hsi_client *cl = msg->cl;
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct hsi_msg *cmsg;
|
|
|
|
if (msg->status == HSI_STATUS_ERROR) {
|
|
dev_err(&cl->device, "TX data error\n");
|
|
ssip_error(cl);
|
|
goto out;
|
|
}
|
|
spin_lock_bh(&ssi->lock);
|
|
if (list_empty(&ssi->txqueue)) {
|
|
ssip_set_txstate(ssi, SENDING_SWBREAK);
|
|
spin_unlock_bh(&ssi->lock);
|
|
cmsg = ssip_claim_cmd(ssi);
|
|
ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD);
|
|
cmsg->complete = ssip_swbreak_complete;
|
|
dev_dbg(&cl->device, "Send SWBREAK\n");
|
|
hsi_async_write(cl, cmsg);
|
|
} else {
|
|
spin_unlock_bh(&ssi->lock);
|
|
ssip_xmit(cl);
|
|
}
|
|
out:
|
|
ssip_free_data(msg);
|
|
}
|
|
|
|
static void ssip_port_event(struct hsi_client *cl, unsigned long event)
|
|
{
|
|
switch (event) {
|
|
case HSI_EVENT_START_RX:
|
|
ssip_start_rx(cl);
|
|
break;
|
|
case HSI_EVENT_STOP_RX:
|
|
ssip_stop_rx(cl);
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int ssip_pn_open(struct net_device *dev)
|
|
{
|
|
struct hsi_client *cl = to_hsi_client(dev->dev.parent);
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
int err;
|
|
|
|
err = hsi_claim_port(cl, 1);
|
|
if (err < 0) {
|
|
dev_err(&cl->device, "SSI port already claimed\n");
|
|
return err;
|
|
}
|
|
err = hsi_register_port_event(cl, ssip_port_event);
|
|
if (err < 0) {
|
|
dev_err(&cl->device, "Register HSI port event failed (%d)\n",
|
|
err);
|
|
return err;
|
|
}
|
|
dev_dbg(&cl->device, "Configuring SSI port\n");
|
|
hsi_setup(cl);
|
|
|
|
if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags))
|
|
ssi_waketest(cl, 1); /* FIXME: To be removed */
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
ssi->main_state = HANDSHAKE;
|
|
spin_unlock_bh(&ssi->lock);
|
|
|
|
ssip_send_bootinfo_req_cmd(cl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ssip_pn_stop(struct net_device *dev)
|
|
{
|
|
struct hsi_client *cl = to_hsi_client(dev->dev.parent);
|
|
|
|
ssip_reset(cl);
|
|
hsi_unregister_port_event(cl);
|
|
hsi_release_port(cl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ssip_xmit_work(struct work_struct *work)
|
|
{
|
|
struct ssi_protocol *ssi =
|
|
container_of(work, struct ssi_protocol, work);
|
|
struct hsi_client *cl = ssi->cl;
|
|
|
|
ssip_xmit(cl);
|
|
}
|
|
|
|
static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct hsi_client *cl = to_hsi_client(dev->dev.parent);
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
struct hsi_msg *msg;
|
|
|
|
if ((skb->protocol != htons(ETH_P_PHONET)) ||
|
|
(skb->len < SSIP_MIN_PN_HDR))
|
|
goto drop;
|
|
/* Pad to 32-bits - FIXME: Revisit*/
|
|
if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3)))
|
|
goto inc_dropped;
|
|
|
|
/*
|
|
* Modem sends Phonet messages over SSI with its own endianness.
|
|
* Assume that modem has the same endianness as we do.
|
|
*/
|
|
if (skb_cow_head(skb, 0))
|
|
goto drop;
|
|
|
|
/* length field is exchanged in network byte order */
|
|
((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]);
|
|
|
|
msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC);
|
|
if (!msg) {
|
|
dev_dbg(&cl->device, "Dropping tx data: No memory\n");
|
|
goto drop;
|
|
}
|
|
msg->complete = ssip_tx_data_complete;
|
|
|
|
spin_lock_bh(&ssi->lock);
|
|
if (unlikely(ssi->main_state != ACTIVE)) {
|
|
spin_unlock_bh(&ssi->lock);
|
|
dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n");
|
|
goto drop2;
|
|
}
|
|
list_add_tail(&msg->link, &ssi->txqueue);
|
|
ssi->txqueue_len++;
|
|
if (dev->tx_queue_len < ssi->txqueue_len) {
|
|
dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len);
|
|
netif_stop_queue(dev);
|
|
}
|
|
if (ssi->send_state == SEND_IDLE) {
|
|
ssip_set_txstate(ssi, WAIT4READY);
|
|
spin_unlock_bh(&ssi->lock);
|
|
dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len);
|
|
hsi_start_tx(cl);
|
|
} else if (ssi->send_state == SEND_READY) {
|
|
/* Needed for cmt-speech workaround */
|
|
dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n",
|
|
ssi->txqueue_len);
|
|
spin_unlock_bh(&ssi->lock);
|
|
schedule_work(&ssi->work);
|
|
} else {
|
|
spin_unlock_bh(&ssi->lock);
|
|
}
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += skb->len;
|
|
|
|
return 0;
|
|
drop2:
|
|
hsi_free_msg(msg);
|
|
drop:
|
|
dev_kfree_skb(skb);
|
|
inc_dropped:
|
|
dev->stats.tx_dropped++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* CMT reset event handler */
|
|
void ssip_reset_event(struct hsi_client *master)
|
|
{
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(master);
|
|
dev_err(&ssi->cl->device, "CMT reset detected!\n");
|
|
ssip_error(ssi->cl);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ssip_reset_event);
|
|
|
|
static const struct net_device_ops ssip_pn_ops = {
|
|
.ndo_open = ssip_pn_open,
|
|
.ndo_stop = ssip_pn_stop,
|
|
.ndo_start_xmit = ssip_pn_xmit,
|
|
};
|
|
|
|
static void ssip_pn_setup(struct net_device *dev)
|
|
{
|
|
dev->features = 0;
|
|
dev->netdev_ops = &ssip_pn_ops;
|
|
dev->type = ARPHRD_PHONET;
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
|
|
dev->mtu = SSIP_DEFAULT_MTU;
|
|
dev->hard_header_len = 1;
|
|
dev->dev_addr[0] = PN_MEDIA_SOS;
|
|
dev->addr_len = 1;
|
|
dev->tx_queue_len = SSIP_TXQUEUE_LEN;
|
|
|
|
dev->needs_free_netdev = true;
|
|
dev->header_ops = &phonet_header_ops;
|
|
}
|
|
|
|
static int ssi_protocol_probe(struct device *dev)
|
|
{
|
|
static const char ifname[] = "phonet%d";
|
|
struct hsi_client *cl = to_hsi_client(dev);
|
|
struct ssi_protocol *ssi;
|
|
int err;
|
|
|
|
ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
|
|
if (!ssi)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&ssi->lock);
|
|
timer_setup(&ssi->rx_wd, ssip_rx_wd, TIMER_DEFERRABLE);
|
|
timer_setup(&ssi->tx_wd, ssip_tx_wd, TIMER_DEFERRABLE);
|
|
timer_setup(&ssi->keep_alive, ssip_keep_alive, 0);
|
|
INIT_LIST_HEAD(&ssi->txqueue);
|
|
INIT_LIST_HEAD(&ssi->cmdqueue);
|
|
atomic_set(&ssi->tx_usecnt, 0);
|
|
hsi_client_set_drvdata(cl, ssi);
|
|
ssi->cl = cl;
|
|
INIT_WORK(&ssi->work, ssip_xmit_work);
|
|
|
|
ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control");
|
|
if (ssi->channel_id_cmd < 0) {
|
|
err = ssi->channel_id_cmd;
|
|
dev_err(dev, "Could not get cmd channel (%d)\n", err);
|
|
goto out;
|
|
}
|
|
|
|
ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data");
|
|
if (ssi->channel_id_data < 0) {
|
|
err = ssi->channel_id_data;
|
|
dev_err(dev, "Could not get data channel (%d)\n", err);
|
|
goto out;
|
|
}
|
|
|
|
err = ssip_alloc_cmds(ssi);
|
|
if (err < 0) {
|
|
dev_err(dev, "No memory for commands\n");
|
|
goto out;
|
|
}
|
|
|
|
ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup);
|
|
if (!ssi->netdev) {
|
|
dev_err(dev, "No memory for netdev\n");
|
|
err = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
/* MTU range: 6 - 65535 */
|
|
ssi->netdev->min_mtu = PHONET_MIN_MTU;
|
|
ssi->netdev->max_mtu = SSIP_MAX_MTU;
|
|
|
|
SET_NETDEV_DEV(ssi->netdev, dev);
|
|
netif_carrier_off(ssi->netdev);
|
|
err = register_netdev(ssi->netdev);
|
|
if (err < 0) {
|
|
dev_err(dev, "Register netdev failed (%d)\n", err);
|
|
goto out2;
|
|
}
|
|
|
|
list_add(&ssi->link, &ssip_list);
|
|
|
|
dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n",
|
|
ssi->channel_id_cmd, ssi->channel_id_data);
|
|
|
|
return 0;
|
|
out2:
|
|
free_netdev(ssi->netdev);
|
|
out1:
|
|
ssip_free_cmds(ssi);
|
|
out:
|
|
kfree(ssi);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ssi_protocol_remove(struct device *dev)
|
|
{
|
|
struct hsi_client *cl = to_hsi_client(dev);
|
|
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
|
|
|
|
list_del(&ssi->link);
|
|
unregister_netdev(ssi->netdev);
|
|
ssip_free_cmds(ssi);
|
|
hsi_client_set_drvdata(cl, NULL);
|
|
kfree(ssi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct hsi_client_driver ssip_driver = {
|
|
.driver = {
|
|
.name = "ssi-protocol",
|
|
.owner = THIS_MODULE,
|
|
.probe = ssi_protocol_probe,
|
|
.remove = ssi_protocol_remove,
|
|
},
|
|
};
|
|
|
|
static int __init ssip_init(void)
|
|
{
|
|
pr_info("SSI protocol aka McSAAB added\n");
|
|
|
|
return hsi_register_client_driver(&ssip_driver);
|
|
}
|
|
module_init(ssip_init);
|
|
|
|
static void __exit ssip_exit(void)
|
|
{
|
|
hsi_unregister_client_driver(&ssip_driver);
|
|
pr_info("SSI protocol driver removed\n");
|
|
}
|
|
module_exit(ssip_exit);
|
|
|
|
MODULE_ALIAS("hsi:ssi-protocol");
|
|
MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
|
|
MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>");
|
|
MODULE_DESCRIPTION("SSI protocol improved aka McSAAB");
|
|
MODULE_LICENSE("GPL");
|