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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
*/
#include <linux/mhi.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include "qrtr.h"
struct qrtr_mhi_dev {
struct qrtr_endpoint ep;
struct mhi_device *mhi_dev;
struct device *dev;
};
/* From MHI to QRTR */
static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev,
struct mhi_result *mhi_res)
{
struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
int rc;
if (!qdev || (mhi_res->transaction_status && mhi_res->transaction_status != -ENOTCONN))
return;
/* Channel got reset. So just free the buffer */
if (mhi_res->transaction_status == -ENOTCONN) {
devm_kfree(&mhi_dev->dev, mhi_res->buf_addr);
return;
}
rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr,
mhi_res->bytes_xferd);
if (rc == -EINVAL)
dev_err(qdev->dev, "invalid ipcrouter packet\n");
/* Done with the buffer, now recycle it for future use */
rc = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, mhi_res->buf_addr,
mhi_dev->mhi_cntrl->buffer_len, MHI_EOT);
if (rc)
dev_err(&mhi_dev->dev, "Failed to recycle the buffer: %d\n", rc);
}
/* From QRTR to MHI */
static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
struct mhi_result *mhi_res)
{
struct sk_buff *skb = mhi_res->buf_addr;
if (skb->sk)
sock_put(skb->sk);
consume_skb(skb);
}
/* Send data over MHI */
static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
{
struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep);
int rc;
if (skb->sk)
sock_hold(skb->sk);
rc = skb_linearize(skb);
if (rc)
goto free_skb;
rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len,
MHI_EOT);
if (rc)
goto free_skb;
return rc;
free_skb:
if (skb->sk)
sock_put(skb->sk);
kfree_skb(skb);
return rc;
}
static int qcom_mhi_qrtr_queue_dl_buffers(struct mhi_device *mhi_dev)
{
u32 free_desc;
void *buf;
int ret;
free_desc = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
while (free_desc--) {
buf = devm_kmalloc(&mhi_dev->dev, mhi_dev->mhi_cntrl->buffer_len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, buf, mhi_dev->mhi_cntrl->buffer_len,
MHI_EOT);
if (ret) {
dev_err(&mhi_dev->dev, "Failed to queue buffer: %d\n", ret);
return ret;
}
}
return 0;
}
static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
const struct mhi_device_id *id)
{
struct qrtr_mhi_dev *qdev;
int rc;
qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL);
if (!qdev)
return -ENOMEM;
qdev->mhi_dev = mhi_dev;
qdev->dev = &mhi_dev->dev;
qdev->ep.xmit = qcom_mhi_qrtr_send;
dev_set_drvdata(&mhi_dev->dev, qdev);
/* start channels */
rc = mhi_prepare_for_transfer(mhi_dev);
if (rc)
return rc;
rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
if (rc)
goto err_unprepare;
rc = qcom_mhi_qrtr_queue_dl_buffers(mhi_dev);
if (rc)
goto err_unregister;
dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n");
return 0;
err_unregister:
qrtr_endpoint_unregister(&qdev->ep);
err_unprepare:
mhi_unprepare_from_transfer(mhi_dev);
return rc;
}
static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev)
{
struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
qrtr_endpoint_unregister(&qdev->ep);
mhi_unprepare_from_transfer(mhi_dev);
dev_set_drvdata(&mhi_dev->dev, NULL);
}
static const struct mhi_device_id qcom_mhi_qrtr_id_table[] = {
{ .chan = "IPCR" },
{}
};
MODULE_DEVICE_TABLE(mhi, qcom_mhi_qrtr_id_table);
static int __maybe_unused qcom_mhi_qrtr_pm_suspend_late(struct device *dev)
{
struct mhi_device *mhi_dev = container_of(dev, struct mhi_device, dev);
enum mhi_state state;
state = mhi_get_mhi_state(mhi_dev->mhi_cntrl);
/*
* If the device is in suspend state, then no need for the
* client driver to unprepare the channels.
*/
if (state == MHI_STATE_M3)
return 0;
mhi_unprepare_from_transfer(mhi_dev);
return 0;
}
static int __maybe_unused qcom_mhi_qrtr_pm_resume_early(struct device *dev)
{
struct mhi_device *mhi_dev = container_of(dev, struct mhi_device, dev);
enum mhi_state state;
int rc;
state = mhi_get_mhi_state(mhi_dev->mhi_cntrl);
/*
* If the device is in suspend state, we won't unprepare channels
* in suspend callback, therefore no need to prepare channels when
* resume.
*/
if (state == MHI_STATE_M3)
return 0;
rc = mhi_prepare_for_transfer(mhi_dev);
if (rc) {
dev_err(dev, "failed to prepare for autoqueue transfer %d\n", rc);
return rc;
}
return qcom_mhi_qrtr_queue_dl_buffers(mhi_dev);
}
static const struct dev_pm_ops qcom_mhi_qrtr_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(qcom_mhi_qrtr_pm_suspend_late,
qcom_mhi_qrtr_pm_resume_early)
};
static struct mhi_driver qcom_mhi_qrtr_driver = {
.probe = qcom_mhi_qrtr_probe,
.remove = qcom_mhi_qrtr_remove,
.dl_xfer_cb = qcom_mhi_qrtr_dl_callback,
.ul_xfer_cb = qcom_mhi_qrtr_ul_callback,
.id_table = qcom_mhi_qrtr_id_table,
.driver = {
.name = "qcom_mhi_qrtr",
.pm = &qcom_mhi_qrtr_pm_ops,
},
};
module_mhi_driver(qcom_mhi_qrtr_driver);
MODULE_AUTHOR("Chris Lew <clew@codeaurora.org>");
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver");
MODULE_LICENSE("GPL v2");
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