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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
// Copyright (c) 2018, Linaro Limited
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/of_device.h>
#include <linux/soc/qcom/apr.h>
#include <linux/soc/qcom/pdr.h>
#include <linux/rpmsg.h>
#include <linux/of.h>
struct apr {
struct rpmsg_endpoint *ch;
struct device *dev;
spinlock_t svcs_lock;
spinlock_t rx_lock;
struct idr svcs_idr;
int dest_domain_id;
struct pdr_handle *pdr;
struct workqueue_struct *rxwq;
struct work_struct rx_work;
struct list_head rx_list;
};
struct apr_rx_buf {
struct list_head node;
int len;
uint8_t buf[];
};
/**
* apr_send_pkt() - Send a apr message from apr device
*
* @adev: Pointer to previously registered apr device.
* @pkt: Pointer to apr packet to send
*
* Return: Will be an negative on packet size on success.
*/
int apr_send_pkt(struct apr_device *adev, struct apr_pkt *pkt)
{
struct apr *apr = dev_get_drvdata(adev->dev.parent);
struct apr_hdr *hdr;
unsigned long flags;
int ret;
spin_lock_irqsave(&adev->lock, flags);
hdr = &pkt->hdr;
hdr->src_domain = APR_DOMAIN_APPS;
hdr->src_svc = adev->svc_id;
hdr->dest_domain = adev->domain_id;
hdr->dest_svc = adev->svc_id;
ret = rpmsg_trysend(apr->ch, pkt, hdr->pkt_size);
spin_unlock_irqrestore(&adev->lock, flags);
return ret ? ret : hdr->pkt_size;
}
EXPORT_SYMBOL_GPL(apr_send_pkt);
static void apr_dev_release(struct device *dev)
{
struct apr_device *adev = to_apr_device(dev);
kfree(adev);
}
static int apr_callback(struct rpmsg_device *rpdev, void *buf,
int len, void *priv, u32 addr)
{
struct apr *apr = dev_get_drvdata(&rpdev->dev);
struct apr_rx_buf *abuf;
unsigned long flags;
if (len <= APR_HDR_SIZE) {
dev_err(apr->dev, "APR: Improper apr pkt received:%p %d\n",
buf, len);
return -EINVAL;
}
abuf = kzalloc(sizeof(*abuf) + len, GFP_ATOMIC);
if (!abuf)
return -ENOMEM;
abuf->len = len;
memcpy(abuf->buf, buf, len);
spin_lock_irqsave(&apr->rx_lock, flags);
list_add_tail(&abuf->node, &apr->rx_list);
spin_unlock_irqrestore(&apr->rx_lock, flags);
queue_work(apr->rxwq, &apr->rx_work);
return 0;
}
static int apr_do_rx_callback(struct apr *apr, struct apr_rx_buf *abuf)
{
uint16_t hdr_size, msg_type, ver, svc_id;
struct apr_device *svc = NULL;
struct apr_driver *adrv = NULL;
struct apr_resp_pkt resp;
struct apr_hdr *hdr;
unsigned long flags;
void *buf = abuf->buf;
int len = abuf->len;
hdr = buf;
ver = APR_HDR_FIELD_VER(hdr->hdr_field);
if (ver > APR_PKT_VER + 1)
return -EINVAL;
hdr_size = APR_HDR_FIELD_SIZE_BYTES(hdr->hdr_field);
if (hdr_size < APR_HDR_SIZE) {
dev_err(apr->dev, "APR: Wrong hdr size:%d\n", hdr_size);
return -EINVAL;
}
if (hdr->pkt_size < APR_HDR_SIZE || hdr->pkt_size != len) {
dev_err(apr->dev, "APR: Wrong packet size\n");
return -EINVAL;
}
msg_type = APR_HDR_FIELD_MT(hdr->hdr_field);
if (msg_type >= APR_MSG_TYPE_MAX) {
dev_err(apr->dev, "APR: Wrong message type: %d\n", msg_type);
return -EINVAL;
}
if (hdr->src_domain >= APR_DOMAIN_MAX ||
hdr->dest_domain >= APR_DOMAIN_MAX ||
hdr->src_svc >= APR_SVC_MAX ||
hdr->dest_svc >= APR_SVC_MAX) {
dev_err(apr->dev, "APR: Wrong APR header\n");
return -EINVAL;
}
svc_id = hdr->dest_svc;
spin_lock_irqsave(&apr->svcs_lock, flags);
svc = idr_find(&apr->svcs_idr, svc_id);
if (svc && svc->dev.driver)
adrv = to_apr_driver(svc->dev.driver);
spin_unlock_irqrestore(&apr->svcs_lock, flags);
if (!adrv) {
dev_err(apr->dev, "APR: service is not registered\n");
return -EINVAL;
}
resp.hdr = *hdr;
resp.payload_size = hdr->pkt_size - hdr_size;
/*
* NOTE: hdr_size is not same as APR_HDR_SIZE as remote can include
* optional headers in to apr_hdr which should be ignored
*/
if (resp.payload_size > 0)
resp.payload = buf + hdr_size;
adrv->callback(svc, &resp);
return 0;
}
static void apr_rxwq(struct work_struct *work)
{
struct apr *apr = container_of(work, struct apr, rx_work);
struct apr_rx_buf *abuf, *b;
unsigned long flags;
if (!list_empty(&apr->rx_list)) {
list_for_each_entry_safe(abuf, b, &apr->rx_list, node) {
apr_do_rx_callback(apr, abuf);
spin_lock_irqsave(&apr->rx_lock, flags);
list_del(&abuf->node);
spin_unlock_irqrestore(&apr->rx_lock, flags);
kfree(abuf);
}
}
}
static int apr_device_match(struct device *dev, struct device_driver *drv)
{
struct apr_device *adev = to_apr_device(dev);
struct apr_driver *adrv = to_apr_driver(drv);
const struct apr_device_id *id = adrv->id_table;
/* Attempt an OF style match first */
if (of_driver_match_device(dev, drv))
return 1;
if (!id)
return 0;
while (id->domain_id != 0 || id->svc_id != 0) {
if (id->domain_id == adev->domain_id &&
id->svc_id == adev->svc_id)
return 1;
id++;
}
return 0;
}
static int apr_device_probe(struct device *dev)
{
struct apr_device *adev = to_apr_device(dev);
struct apr_driver *adrv = to_apr_driver(dev
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