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android_kernel_samsung_msm8976/drivers/soc/qcom/ipc_router_smd_xprt.c

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/* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* IPC ROUTER SMD XPRT module.
*/
#define DEBUG
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/of.h>
#include <linux/ipc_router_xprt.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <mach/msm_smd.h>
#include <mach/subsystem_restart.h>
#include <mach/msm_smsm.h>
static int msm_ipc_router_smd_xprt_debug_mask;
module_param_named(debug_mask, msm_ipc_router_smd_xprt_debug_mask,
int, S_IRUGO | S_IWUSR | S_IWGRP);
#if defined(DEBUG)
#define D(x...) do { \
if (msm_ipc_router_smd_xprt_debug_mask) \
pr_info(x); \
} while (0)
#else
#define D(x...) do { } while (0)
#endif
#define MIN_FRAG_SZ (IPC_ROUTER_HDR_SIZE + sizeof(union rr_control_msg))
#define NUM_SMD_XPRTS 4
#define XPRT_NAME_LEN (SMD_MAX_CH_NAME_LEN + 12)
/**
* msm_ipc_router_smd_xprt - IPC Router's SMD XPRT structure
* @list: IPC router's SMD XPRTs list.
* @ch_name: Name of the HSIC endpoint exported by ipc_bridge driver.
* @xprt_name: Name of the XPRT to be registered with IPC Router.
* @edge: SMD channel edge.
* @driver: Platform drivers register by this XPRT.
* @xprt: IPC Router XPRT structure to contain XPRT specific info.
* @channel: SMD channel specific info.
* @smd_xprt_wq: Workqueue to queue read & other XPRT related works.
* @write_avail_wait_q: wait queue for writer thread.
* @in_pkt: Pointer to any partially read packet.
* @is_partial_in_pkt: check pkt completion.
* @read_work: Read Work to perform read operation from SMD.
* @ss_reset_lock: Lock to protect access to the ss_reset flag.
* @ss_reset: flag used to check SSR state.
* @pil: handle to the remote subsystem.
* @sft_close_complete: Variable to indicate completion of SSR handling
* by IPC Router.
* @xprt_version: IPC Router header version supported by this XPRT.
* @xprt_option: XPRT specific options to be handled by IPC Router.
*/
struct msm_ipc_router_smd_xprt {
struct list_head list;
char ch_name[SMD_MAX_CH_NAME_LEN];
char xprt_name[XPRT_NAME_LEN];
uint32_t edge;
struct platform_driver driver;
struct msm_ipc_router_xprt xprt;
smd_channel_t *channel;
struct workqueue_struct *smd_xprt_wq;
wait_queue_head_t write_avail_wait_q;
struct rr_packet *in_pkt;
int is_partial_in_pkt;
struct delayed_work read_work;
spinlock_t ss_reset_lock; /*Subsystem reset lock*/
int ss_reset;
void *pil;
struct completion sft_close_complete;
unsigned xprt_version;
unsigned xprt_option;
};
struct msm_ipc_router_smd_xprt_work {
struct msm_ipc_router_xprt *xprt;
struct work_struct work;
};
static void smd_xprt_read_data(struct work_struct *work);
static void smd_xprt_open_event(struct work_struct *work);
static void smd_xprt_close_event(struct work_struct *work);
/**
* msm_ipc_router_smd_xprt_config - Config. Info. of each SMD XPRT
* @ch_name: Name of the SMD endpoint exported by SMD driver.
* @xprt_name: Name of the XPRT to be registered with IPC Router.
* @edge: ID to differentiate among multiple SMD endpoints.
* @link_id: Network Cluster ID to which this XPRT belongs to.
* @xprt_version: IPC Router header version supported by this XPRT.
*/
struct msm_ipc_router_smd_xprt_config {
char ch_name[SMD_MAX_CH_NAME_LEN];
char xprt_name[XPRT_NAME_LEN];
uint32_t edge;
uint32_t link_id;
unsigned xprt_version;
unsigned xprt_option;
};
struct msm_ipc_router_smd_xprt_config smd_xprt_cfg[] = {
{"RPCRPY_CNTL", "ipc_rtr_smd_rpcrpy_cntl", SMD_APPS_MODEM, 1, 1},
{"IPCRTR", "ipc_rtr_smd_ipcrtr", SMD_APPS_MODEM, 1, 1},
{"IPCRTR", "ipc_rtr_q6_ipcrtr", SMD_APPS_QDSP, 1, 1},
{"IPCRTR", "ipc_rtr_wcnss_ipcrtr", SMD_APPS_WCNSS, 1, 1},
};
#define MODULE_NAME "ipc_router_smd_xprt"
#define IPC_ROUTER_SMD_XPRT_WAIT_TIMEOUT 3000
static int ipc_router_smd_xprt_probe_done;
static struct delayed_work ipc_router_smd_xprt_probe_work;
static DEFINE_MUTEX(smd_remote_xprt_list_lock_lha1);
static LIST_HEAD(smd_remote_xprt_list);
static int msm_ipc_router_smd_get_xprt_version(
struct msm_ipc_router_xprt *xprt)
{
struct msm_ipc_router_smd_xprt *smd_xprtp;
if (!xprt)
return -EINVAL;
smd_xprtp = container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
return (int)smd_xprtp->xprt_version;
}
static int msm_ipc_router_smd_get_xprt_option(
struct msm_ipc_router_xprt *xprt)
{
struct msm_ipc_router_smd_xprt *smd_xprtp;
if (!xprt)
return -EINVAL;
smd_xprtp = container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
return (int)smd_xprtp->xprt_option;
}
static int msm_ipc_router_smd_remote_write_avail(
struct msm_ipc_router_xprt *xprt)
{
struct msm_ipc_router_smd_xprt *smd_xprtp =
container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
return smd_write_avail(smd_xprtp->channel);
}
static int msm_ipc_router_smd_remote_write(void *data,
uint32_t len,
struct msm_ipc_router_xprt *xprt)
{
struct rr_packet *pkt = (struct rr_packet *)data;
struct sk_buff *ipc_rtr_pkt;
int offset, sz_written = 0;
int ret, num_retries = 0;
unsigned long flags;
struct msm_ipc_router_smd_xprt *smd_xprtp =
container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
if (!pkt)
return -EINVAL;
if (!len || pkt->length != len)
return -EINVAL;
while ((ret = smd_write_start(smd_xprtp->channel, len)) < 0) {
spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
if (smd_xprtp->ss_reset) {
spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock,
flags);
pr_err("%s: %s chnl reset\n", __func__, xprt->name);
return -ENETRESET;
}
spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
if (num_retries >= 5) {
pr_err("%s: Error %d @smd_write_start for %s\n",
__func__, ret, xprt->name);
return ret;
}
msleep(50);
num_retries++;
}
D("%s: Ready to write %d bytes\n", __func__, len);
skb_queue_walk(pkt->pkt_fragment_q, ipc_rtr_pkt) {
offset = 0;
while (offset < ipc_rtr_pkt->len) {
if (!smd_write_segment_avail(smd_xprtp->channel))
smd_enable_read_intr(smd_xprtp->channel);
wait_event(smd_xprtp->write_avail_wait_q,
(smd_write_segment_avail(smd_xprtp->channel) ||
smd_xprtp->ss_reset));
smd_disable_read_intr(smd_xprtp->channel);
spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
if (smd_xprtp->ss_reset) {
spin_unlock_irqrestore(
&smd_xprtp->ss_reset_lock, flags);
pr_err("%s: %s chnl reset\n",
__func__, xprt->name);
return -ENETRESET;
}
spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock,
flags);
sz_written = smd_write_segment(smd_xprtp->channel,
ipc_rtr_pkt->data + offset,
(ipc_rtr_pkt->len - offset), 0);
offset += sz_written;
sz_written = 0;
}
D("%s: Wrote %d bytes over %s\n",
__func__, offset, xprt->name);
}
if (!smd_write_end(smd_xprtp->channel))
D("%s: Finished writing\n", __func__);
return len;
}
static int msm_ipc_router_smd_remote_close(struct msm_ipc_router_xprt *xprt)
{
int rc;
struct msm_ipc_router_smd_xprt *smd_xprtp =
container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
rc = smd_close(smd_xprtp->channel);
if (smd_xprtp->pil) {
subsystem_put(smd_xprtp->pil);
smd_xprtp->pil = NULL;
}
return rc;
}
static void smd_xprt_sft_close_done(struct msm_ipc_router_xprt *xprt)
{
struct msm_ipc_router_smd_xprt *smd_xprtp =
container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
complete_all(&smd_xprtp->sft_close_complete);
}
static void smd_xprt_read_data(struct work_struct *work)
{
int pkt_size, sz_read, sz;
struct sk_buff *ipc_rtr_pkt;
void *data;
unsigned long flags;
struct delayed_work *rwork = to_delayed_work(work);
struct msm_ipc_router_smd_xprt *smd_xprtp =
container_of(rwork, struct msm_ipc_router_smd_xprt, read_work);
spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
if (smd_xprtp->ss_reset) {
spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
if (smd_xprtp->in_pkt)
release_pkt(smd_xprtp->in_pkt);
smd_xprtp->is_partial_in_pkt = 0;
pr_err("%s: %s channel reset\n",
__func__, smd_xprtp->xprt.name);
return;
}
spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
D("%s pkt_size: %d, read_avail: %d\n", __func__,
smd_cur_packet_size(smd_xprtp->channel),
smd_read_avail(smd_xprtp->channel));
while ((pkt_size = smd_cur_packet_size(smd_xprtp->channel)) &&
smd_read_avail(smd_xprtp->channel)) {
if (!smd_xprtp->is_partial_in_pkt) {
smd_xprtp->in_pkt = kzalloc(sizeof(struct rr_packet),
GFP_KERNEL);
if (!smd_xprtp->in_pkt) {
pr_err("%s: Couldn't alloc rr_packet\n",
__func__);
return;
}
smd_xprtp->in_pkt->pkt_fragment_q =
kmalloc(sizeof(struct sk_buff_head),
GFP_KERNEL);
if (!smd_xprtp->in_pkt->pkt_fragment_q) {
pr_err("%s: Couldn't alloc pkt_fragment_q\n",
__func__);
kfree(smd_xprtp->in_pkt);
return;
}
skb_queue_head_init(smd_xprtp->in_pkt->pkt_fragment_q);
smd_xprtp->is_partial_in_pkt = 1;
D("%s: Allocated rr_packet\n", __func__);
}
if (((pkt_size >= MIN_FRAG_SZ) &&
(smd_read_avail(smd_xprtp->channel) < MIN_FRAG_SZ)) ||
((pkt_size < MIN_FRAG_SZ) &&
(smd_read_avail(smd_xprtp->channel) < pkt_size)))
return;
sz = smd_read_avail(smd_xprtp->channel);
do {
ipc_rtr_pkt = alloc_skb(sz, GFP_KERNEL);
if (!ipc_rtr_pkt) {
if (sz <= (PAGE_SIZE/2)) {
queue_delayed_work(
smd_xprtp->smd_xprt_wq,
&smd_xprtp->read_work,
msecs_to_jiffies(100));
return;
}
sz = sz / 2;
}
} while (!ipc_rtr_pkt);
D("%s: Allocated the sk_buff of size %d\n", __func__, sz);
data = skb_put(ipc_rtr_pkt, sz);
sz_read = smd_read(smd_xprtp->channel, data, sz);
if (sz_read != sz) {
pr_err("%s: Couldn't read %s completely\n",
__func__, smd_xprtp->xprt.name);
kfree_skb(ipc_rtr_pkt);
release_pkt(smd_xprtp->in_pkt);
smd_xprtp->is_partial_in_pkt = 0;
return;
}
skb_queue_tail(smd_xprtp->in_pkt->pkt_fragment_q, ipc_rtr_pkt);
smd_xprtp->in_pkt->length += sz_read;
if (sz_read != pkt_size)
smd_xprtp->is_partial_in_pkt = 1;
else
smd_xprtp->is_partial_in_pkt = 0;
if (!smd_xprtp->is_partial_in_pkt) {
D("%s: Packet size read %d\n",
__func__, smd_xprtp->in_pkt->length);
msm_ipc_router_xprt_notify(&smd_xprtp->xprt,
IPC_ROUTER_XPRT_EVENT_DATA,
(void *)smd_xprtp->in_pkt);
release_pkt(smd_xprtp->in_pkt);
smd_xprtp->in_pkt = NULL;
}
}
}
static void smd_xprt_open_event(struct work_struct *work)
{
struct msm_ipc_router_smd_xprt_work *xprt_work =
container_of(work, struct msm_ipc_router_smd_xprt_work, work);
struct msm_ipc_router_smd_xprt *smd_xprtp =
container_of(xprt_work->xprt,
struct msm_ipc_router_smd_xprt, xprt);
unsigned long flags;
spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
smd_xprtp->ss_reset = 0;
spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
msm_ipc_router_xprt_notify(xprt_work->xprt,
IPC_ROUTER_XPRT_EVENT_OPEN, NULL);
D("%s: Notified IPC Router of %s OPEN\n",
__func__, xprt_work->xprt->name);
kfree(xprt_work);
}
static void smd_xprt_close_event(struct work_struct *work)
{
struct msm_ipc_router_smd_xprt_work *xprt_work =
container_of(work, struct msm_ipc_router_smd_xprt_work, work);
struct msm_ipc_router_smd_xprt *smd_xprtp =
container_of(xprt_work->xprt,
struct msm_ipc_router_smd_xprt, xprt);
init_completion(&smd_xprtp->sft_close_complete);
msm_ipc_router_xprt_notify(xprt_work->xprt,
IPC_ROUTER_XPRT_EVENT_CLOSE, NULL);
D("%s: Notified IPC Router of %s CLOSE\n",
__func__, xprt_work->xprt->name);
wait_for_completion(&smd_xprtp->sft_close_complete);
kfree(xprt_work);
}
static void msm_ipc_router_smd_remote_notify(void *_dev, unsigned event)
{
unsigned long flags;
struct msm_ipc_router_smd_xprt *smd_xprtp;
struct msm_ipc_router_smd_xprt_work *xprt_work;
smd_xprtp = (struct msm_ipc_router_smd_xprt *)_dev;
if (!smd_xprtp)
return;
switch (event) {
case SMD_EVENT_DATA:
if (smd_read_avail(smd_xprtp->channel))
queue_delayed_work(smd_xprtp->smd_xprt_wq,
&smd_xprtp->read_work, 0);
if (smd_write_segment_avail(smd_xprtp->channel))
wake_up(&smd_xprtp->write_avail_wait_q);
break;
case SMD_EVENT_OPEN:
xprt_work = kmalloc(sizeof(struct msm_ipc_router_smd_xprt_work),
GFP_ATOMIC);
if (!xprt_work) {
pr_err("%s: Couldn't notify %d event to IPC Router\n",
__func__, event);
return;
}
xprt_work->xprt = &smd_xprtp->xprt;
INIT_WORK(&xprt_work->work, smd_xprt_open_event);
queue_work(smd_xprtp->smd_xprt_wq, &xprt_work->work);
break;
case SMD_EVENT_CLOSE:
spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
smd_xprtp->ss_reset = 1;
spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
wake_up(&smd_xprtp->write_avail_wait_q);
xprt_work = kmalloc(sizeof(struct msm_ipc_router_smd_xprt_work),
GFP_ATOMIC);
if (!xprt_work) {
pr_err("%s: Couldn't notify %d event to IPC Router\n",
__func__, event);
return;
}
xprt_work->xprt = &smd_xprtp->xprt;
INIT_WORK(&xprt_work->work, smd_xprt_close_event);
queue_work(smd_xprtp->smd_xprt_wq, &xprt_work->work);
break;
}
}
static void *msm_ipc_load_subsystem(uint32_t edge)
{
void *pil = NULL;
const char *peripheral;
peripheral = smd_edge_to_pil_str(edge);
if (peripheral) {
pil = subsystem_get(peripheral);
if (IS_ERR(pil)) {
pr_err("%s: Failed to load %s\n",
__func__, peripheral);
pil = NULL;
}
}
return pil;
}
/**
* find_smd_xprt_list() - Find xprt item specific to an HSIC endpoint
* @pdev: Platform device registered by HSIC's ipc_bridge driver
*
* @return: pointer to msm_ipc_router_smd_xprt if matching endpoint is found,
* else NULL.
*
* This function is used to find specific xprt item from the global xprt list
*/
static struct msm_ipc_router_smd_xprt *
find_smd_xprt_list(struct platform_device *pdev)
{
struct msm_ipc_router_smd_xprt *smd_xprtp;
mutex_lock(&smd_remote_xprt_list_lock_lha1);
list_for_each_entry(smd_xprtp, &smd_remote_xprt_list, list) {
if (!strcmp(pdev->name, smd_xprtp->ch_name)
&& (pdev->id == smd_xprtp->edge)) {
mutex_unlock(&smd_remote_xprt_list_lock_lha1);
return smd_xprtp;
}
}
mutex_unlock(&smd_remote_xprt_list_lock_lha1);
return NULL;
}
/**
* msm_ipc_router_smd_remote_probe() - Probe an SMD endpoint
*
* @pdev: Platform device corresponding to SMD endpoint.
*
* @return: 0 on success, standard Linux error codes on error.
*
* This function is called when the underlying SMD driver registers
* a platform device, mapped to SMD endpoint.
*/
static int msm_ipc_router_smd_remote_probe(struct platform_device *pdev)
{
int rc;
struct msm_ipc_router_smd_xprt *smd_xprtp;
smd_xprtp = find_smd_xprt_list(pdev);
if (!smd_xprtp) {
pr_err("%s No device with name %s\n", __func__, pdev->name);
return -EPROBE_DEFER;
}
if (strcmp(pdev->name, smd_xprtp->ch_name)
|| (pdev->id != smd_xprtp->edge)) {
pr_err("%s wrong item name:%s edge:%d\n",
__func__, smd_xprtp->ch_name, smd_xprtp->edge);
return -ENODEV;
}
smd_xprtp->smd_xprt_wq =
create_singlethread_workqueue(pdev->name);
if (!smd_xprtp->smd_xprt_wq) {
pr_err("%s: WQ creation failed for %s\n",
__func__, pdev->name);
return -EFAULT;
}
smd_xprtp->pil = msm_ipc_load_subsystem(
smd_xprtp->edge);
rc = smd_named_open_on_edge(smd_xprtp->ch_name,
smd_xprtp->edge,
&smd_xprtp->channel,
smd_xprtp,
msm_ipc_router_smd_remote_notify);
if (rc < 0) {
pr_err("%s: Channel open failed for %s\n",
__func__, smd_xprtp->ch_name);
if (smd_xprtp->pil) {
subsystem_put(smd_xprtp->pil);
smd_xprtp->pil = NULL;
}
destroy_workqueue(smd_xprtp->smd_xprt_wq);
return rc;
}
smd_disable_read_intr(smd_xprtp->channel);
smsm_change_state(SMSM_APPS_STATE, 0, SMSM_RPCINIT);
return 0;
}
void *msm_ipc_load_default_node(void)
{
void *pil = NULL;
const char *peripheral;
peripheral = smd_edge_to_pil_str(SMD_APPS_MODEM);
if (peripheral && !strncmp(peripheral, "modem", 6)) {
pil = subsystem_get(peripheral);
if (IS_ERR(pil)) {
pr_err("%s: Failed to load %s\n",
__func__, peripheral);
pil = NULL;
}
}
return pil;
}
EXPORT_SYMBOL(msm_ipc_load_default_node);
void msm_ipc_unload_default_node(void *pil)
{
if (pil)
subsystem_put(pil);
}
EXPORT_SYMBOL(msm_ipc_unload_default_node);
/**
* msm_ipc_router_smd_driver_register() - register SMD XPRT drivers
*
* @smd_xprtp: pointer to Ipc router smd xprt structure.
*
* @return: 0 on success, standard Linux error codes on error.
*
* This function is called when a new XPRT is added to register platform
* drivers for new XPRT.
*/
static int msm_ipc_router_smd_driver_register(
struct msm_ipc_router_smd_xprt *smd_xprtp)
{
int ret;
struct msm_ipc_router_smd_xprt *item;
unsigned already_registered = 0;
mutex_lock(&smd_remote_xprt_list_lock_lha1);
list_for_each_entry(item, &smd_remote_xprt_list, list) {
if (!strcmp(smd_xprtp->ch_name, item->ch_name))
already_registered = 1;
}
list_add(&smd_xprtp->list, &smd_remote_xprt_list);
mutex_unlock(&smd_remote_xprt_list_lock_lha1);
if (!already_registered) {
smd_xprtp->driver.driver.name = smd_xprtp->ch_name;
smd_xprtp->driver.driver.owner = THIS_MODULE;
smd_xprtp->driver.probe = msm_ipc_router_smd_remote_probe;
ret = platform_driver_register(&smd_xprtp->driver);
if (ret) {
pr_err("%s: Failed to register platform driver [%s]\n",
__func__, smd_xprtp->ch_name);
return ret;
}
} else {
pr_err("%s Already driver registered %s\n",
__func__, smd_xprtp->ch_name);
}
return 0;
}
/**
* msm_ipc_router_smd_config_init() - init SMD xprt configs
*
* @smd_xprt_config: pointer to SMD xprt configurations.
*
* @return: 0 on success, standard Linux error codes on error.
*
* This function is called to initialize the SMD XPRT pointer with
* the SMD XPRT configurations either from device tree or static arrays.
*/
static int msm_ipc_router_smd_config_init(
struct msm_ipc_router_smd_xprt_config *smd_xprt_config)
{
struct msm_ipc_router_smd_xprt *smd_xprtp;
smd_xprtp = kzalloc(sizeof(struct msm_ipc_router_smd_xprt), GFP_KERNEL);
if (IS_ERR_OR_NULL(smd_xprtp)) {
pr_err("%s: kzalloc() failed for smd_xprtp id:%s\n",
__func__, smd_xprt_config->ch_name);
return -ENOMEM;
}
smd_xprtp->xprt.link_id = smd_xprt_config->link_id;
smd_xprtp->xprt_version = smd_xprt_config->xprt_version;
smd_xprtp->edge = smd_xprt_config->edge;
smd_xprtp->xprt_option = smd_xprt_config->xprt_option;
strlcpy(smd_xprtp->ch_name, smd_xprt_config->ch_name,
SMD_MAX_CH_NAME_LEN);
strlcpy(smd_xprtp->xprt_name, smd_xprt_config->xprt_name,
XPRT_NAME_LEN);
smd_xprtp->xprt.name = smd_xprtp->xprt_name;
smd_xprtp->xprt.get_version =
msm_ipc_router_smd_get_xprt_version;
smd_xprtp->xprt.get_option =
msm_ipc_router_smd_get_xprt_option;
smd_xprtp->xprt.read_avail = NULL;
smd_xprtp->xprt.read = NULL;
smd_xprtp->xprt.write_avail =
msm_ipc_router_smd_remote_write_avail;
smd_xprtp->xprt.write = msm_ipc_router_smd_remote_write;
smd_xprtp->xprt.close = msm_ipc_router_smd_remote_close;
smd_xprtp->xprt.sft_close_done = smd_xprt_sft_close_done;
smd_xprtp->xprt.priv = NULL;
init_waitqueue_head(&smd_xprtp->write_avail_wait_q);
smd_xprtp->in_pkt = NULL;
smd_xprtp->is_partial_in_pkt = 0;
INIT_DELAYED_WORK(&smd_xprtp->read_work, smd_xprt_read_data);
spin_lock_init(&smd_xprtp->ss_reset_lock);
smd_xprtp->ss_reset = 0;
msm_ipc_router_smd_driver_register(smd_xprtp);
return 0;
}
/**
* parse_devicetree() - parse device tree binding
*
* @node: pointer to device tree node
* @smd_xprt_config: pointer to SMD XPRT configurations
*
* @return: 0 on success, -ENODEV on failure.
*/
static int parse_devicetree(struct device_node *node,
struct msm_ipc_router_smd_xprt_config *smd_xprt_config)
{
int ret;
int edge;
int link_id;
int version;
char *key;
const char *ch_name;
const char *remote_ss;
key = "qcom,ch-name";
ch_name = of_get_property(node, key, NULL);
if (!ch_name)
goto error;
strlcpy(smd_xprt_config->ch_name, ch_name, SMD_MAX_CH_NAME_LEN);
key = "qcom,xprt-remote";
remote_ss = of_get_property(node, key, NULL);
if (!remote_ss)
goto error;
edge = smd_remote_ss_to_edge(remote_ss);
if (edge < 0)
goto error;
smd_xprt_config->edge = edge;
key = "qcom,xprt-linkid";
ret = of_property_read_u32(node, key, &link_id);
if (ret)
goto error;
smd_xprt_config->link_id = link_id;
key = "qcom,xprt-version";
ret = of_property_read_u32(node, key, &version);
if (ret)
goto error;
smd_xprt_config->xprt_version = version;
key = "qcom,fragmented-data";
smd_xprt_config->xprt_option = of_property_read_bool(node, key);
scnprintf(smd_xprt_config->xprt_name, XPRT_NAME_LEN, "%s_%s",
remote_ss, smd_xprt_config->ch_name);
return 0;
error:
pr_err("%s: missing key: %s\n", __func__, key);
return -ENODEV;
}
/**
* msm_ipc_router_smd_xprt_probe() - Probe an SMD xprt
*
* @pdev: Platform device corresponding to SMD xprt.
*
* @return: 0 on success, standard Linux error codes on error.
*
* This function is called when the underlying device tree driver registers
* a platform device, mapped to an SMD transport.
*/
static int msm_ipc_router_smd_xprt_probe(struct platform_device *pdev)
{
int ret;
struct msm_ipc_router_smd_xprt_config smd_xprt_config;
if (pdev) {
if (pdev->dev.of_node) {
mutex_lock(&smd_remote_xprt_list_lock_lha1);
ipc_router_smd_xprt_probe_done = 1;
mutex_unlock(&smd_remote_xprt_list_lock_lha1);
ret = parse_devicetree(pdev->dev.of_node,
&smd_xprt_config);
if (ret) {
pr_err(" failed to parse device tree\n");
return ret;
}
ret = msm_ipc_router_smd_config_init(&smd_xprt_config);
if (ret) {
pr_err("%s init failed\n", __func__);
return ret;
}
}
}
return 0;
}
/**
* ipc_router_smd_xprt_probe_worker() - probe worker for non DT configurations
*
* @work: work item to process
*
* This function is called by schedule_delay_work after 3sec and check if
* device tree probe is done or not. If device tree probe fails the default
* configurations read from static array.
*/
static void ipc_router_smd_xprt_probe_worker(struct work_struct *work)
{
int i, ret;
BUG_ON(ARRAY_SIZE(smd_xprt_cfg) != NUM_SMD_XPRTS);
mutex_lock(&smd_remote_xprt_list_lock_lha1);
if (!ipc_router_smd_xprt_probe_done) {
mutex_unlock(&smd_remote_xprt_list_lock_lha1);
for (i = 0; i < ARRAY_SIZE(smd_xprt_cfg); i++) {
ret = msm_ipc_router_smd_config_init(&smd_xprt_cfg[i]);
if (ret)
pr_err(" %s init failed config idx %d\n",
__func__, i);
}
mutex_lock(&smd_remote_xprt_list_lock_lha1);
}
mutex_unlock(&smd_remote_xprt_list_lock_lha1);
}
static struct of_device_id msm_ipc_router_smd_xprt_match_table[] = {
{ .compatible = "qcom,ipc_router_smd_xprt" },
{},
};
static struct platform_driver msm_ipc_router_smd_xprt_driver = {
.probe = msm_ipc_router_smd_xprt_probe,
.driver = {
.name = MODULE_NAME,
.owner = THIS_MODULE,
.of_match_table = msm_ipc_router_smd_xprt_match_table,
},
};
static int __init msm_ipc_router_smd_xprt_init(void)
{
int rc;
rc = platform_driver_register(&msm_ipc_router_smd_xprt_driver);
if (rc) {
pr_err("%s: msm_ipc_router_smd_xprt_driver register failed %d\n",
__func__, rc);
return rc;
}
INIT_DELAYED_WORK(&ipc_router_smd_xprt_probe_work,
ipc_router_smd_xprt_probe_worker);
schedule_delayed_work(&ipc_router_smd_xprt_probe_work,
msecs_to_jiffies(IPC_ROUTER_SMD_XPRT_WAIT_TIMEOUT));
return 0;
}
module_init(msm_ipc_router_smd_xprt_init);
MODULE_DESCRIPTION("IPC Router SMD XPRT");
MODULE_LICENSE("GPL v2");
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