1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/mhi.h>
7*4882a593Smuzhiyun #include <linux/mod_devicetable.h>
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/skbuff.h>
10*4882a593Smuzhiyun #include <net/sock.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include "qrtr.h"
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun struct qrtr_mhi_dev {
15*4882a593Smuzhiyun struct qrtr_endpoint ep;
16*4882a593Smuzhiyun struct mhi_device *mhi_dev;
17*4882a593Smuzhiyun struct device *dev;
18*4882a593Smuzhiyun };
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun /* From MHI to QRTR */
qcom_mhi_qrtr_dl_callback(struct mhi_device * mhi_dev,struct mhi_result * mhi_res)21*4882a593Smuzhiyun static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev,
22*4882a593Smuzhiyun struct mhi_result *mhi_res)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
25*4882a593Smuzhiyun int rc;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun if (!qdev || mhi_res->transaction_status)
28*4882a593Smuzhiyun return;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr,
31*4882a593Smuzhiyun mhi_res->bytes_xferd);
32*4882a593Smuzhiyun if (rc == -EINVAL)
33*4882a593Smuzhiyun dev_err(qdev->dev, "invalid ipcrouter packet\n");
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /* From QRTR to MHI */
qcom_mhi_qrtr_ul_callback(struct mhi_device * mhi_dev,struct mhi_result * mhi_res)37*4882a593Smuzhiyun static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
38*4882a593Smuzhiyun struct mhi_result *mhi_res)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun struct sk_buff *skb = mhi_res->buf_addr;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun if (skb->sk)
43*4882a593Smuzhiyun sock_put(skb->sk);
44*4882a593Smuzhiyun consume_skb(skb);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /* Send data over MHI */
qcom_mhi_qrtr_send(struct qrtr_endpoint * ep,struct sk_buff * skb)48*4882a593Smuzhiyun static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep);
51*4882a593Smuzhiyun int rc;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun if (skb->sk)
54*4882a593Smuzhiyun sock_hold(skb->sk);
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun rc = skb_linearize(skb);
57*4882a593Smuzhiyun if (rc)
58*4882a593Smuzhiyun goto free_skb;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len,
61*4882a593Smuzhiyun MHI_EOT);
62*4882a593Smuzhiyun if (rc)
63*4882a593Smuzhiyun goto free_skb;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun return rc;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun free_skb:
68*4882a593Smuzhiyun if (skb->sk)
69*4882a593Smuzhiyun sock_put(skb->sk);
70*4882a593Smuzhiyun kfree_skb(skb);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun return rc;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
qcom_mhi_qrtr_probe(struct mhi_device * mhi_dev,const struct mhi_device_id * id)75*4882a593Smuzhiyun static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
76*4882a593Smuzhiyun const struct mhi_device_id *id)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun struct qrtr_mhi_dev *qdev;
79*4882a593Smuzhiyun int rc;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL);
82*4882a593Smuzhiyun if (!qdev)
83*4882a593Smuzhiyun return -ENOMEM;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun qdev->mhi_dev = mhi_dev;
86*4882a593Smuzhiyun qdev->dev = &mhi_dev->dev;
87*4882a593Smuzhiyun qdev->ep.xmit = qcom_mhi_qrtr_send;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun dev_set_drvdata(&mhi_dev->dev, qdev);
90*4882a593Smuzhiyun rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
91*4882a593Smuzhiyun if (rc)
92*4882a593Smuzhiyun return rc;
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n");
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun return 0;
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
qcom_mhi_qrtr_remove(struct mhi_device * mhi_dev)99*4882a593Smuzhiyun static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev)
100*4882a593Smuzhiyun {
101*4882a593Smuzhiyun struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev);
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun qrtr_endpoint_unregister(&qdev->ep);
104*4882a593Smuzhiyun dev_set_drvdata(&mhi_dev->dev, NULL);
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun static const struct mhi_device_id qcom_mhi_qrtr_id_table[] = {
108*4882a593Smuzhiyun { .chan = "IPCR" },
109*4882a593Smuzhiyun {}
110*4882a593Smuzhiyun };
111*4882a593Smuzhiyun MODULE_DEVICE_TABLE(mhi, qcom_mhi_qrtr_id_table);
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun static struct mhi_driver qcom_mhi_qrtr_driver = {
114*4882a593Smuzhiyun .probe = qcom_mhi_qrtr_probe,
115*4882a593Smuzhiyun .remove = qcom_mhi_qrtr_remove,
116*4882a593Smuzhiyun .dl_xfer_cb = qcom_mhi_qrtr_dl_callback,
117*4882a593Smuzhiyun .ul_xfer_cb = qcom_mhi_qrtr_ul_callback,
118*4882a593Smuzhiyun .id_table = qcom_mhi_qrtr_id_table,
119*4882a593Smuzhiyun .driver = {
120*4882a593Smuzhiyun .name = "qcom_mhi_qrtr",
121*4882a593Smuzhiyun },
122*4882a593Smuzhiyun };
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun module_mhi_driver(qcom_mhi_qrtr_driver);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun MODULE_AUTHOR("Chris Lew <clew@codeaurora.org>");
127*4882a593Smuzhiyun MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
128*4882a593Smuzhiyun MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver");
129*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
130