@@ -224,6 +224,10 @@ of the defined channels, and their uses.
| | | | device side logs with the host time |
| | | | source. |
+----------------+---------+----------+----------------------------------------+
+| QAIC_TIMESYNC | 22 & 23 | AMSS | Used to periodically synchronize |
+| _PERIODIC | | | timestamps in the device side logs with|
+| | | | the host time source. |
++----------------+---------+----------+----------------------------------------+
DMA Bridge
==========
@@ -178,3 +178,8 @@ overrides this for that call. Default is 5000 (5 seconds).
Sets the polling interval in microseconds (us) when datapath polling is active.
Takes effect at the next polling interval. Default is 100 (100 us).
+
+**timesync_delay_ms (unsigned int)**
+
+Sets the time interval in milliseconds (ms) between two consecutive timesync
+operations. Default is 1000 (1000 ms).
@@ -9,4 +9,5 @@ qaic-y := \
mhi_controller.o \
qaic_control.o \
qaic_data.o \
- qaic_drv.o
+ qaic_drv.o \
+ qaic_timesync.o
@@ -373,6 +373,38 @@ static struct mhi_channel_config aic100_channels[] = {
.auto_queue = false,
.wake_capable = false,
},
+ {
+ .name = "QAIC_TIMESYNC_PERIODIC",
+ .num = 22,
+ .num_elements = 32,
+ .local_elements = 0,
+ .event_ring = 0,
+ .dir = DMA_TO_DEVICE,
+ .ee_mask = MHI_CH_EE_AMSS,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ .wake_capable = false,
+ },
+ {
+ .num = 23,
+ .name = "QAIC_TIMESYNC_PERIODIC",
+ .num_elements = 32,
+ .local_elements = 0,
+ .event_ring = 0,
+ .dir = DMA_FROM_DEVICE,
+ .ee_mask = MHI_CH_EE_AMSS,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ .wake_capable = false,
+ },
};
static struct mhi_event_config aic100_events[] = {
@@ -27,6 +27,7 @@
#include "mhi_controller.h"
#include "qaic.h"
+#include "qaic_timesync.h"
MODULE_IMPORT_NS(DMA_BUF);
@@ -586,8 +587,16 @@ static int __init qaic_init(void)
goto free_pci;
}
+ ret = qaic_timesync_init();
+ if (ret) {
+ pr_debug("qaic: qaic_timesync_init failed %d\n", ret);
+ goto free_mhi;
+ }
+
return 0;
+free_mhi:
+ mhi_driver_unregister(&qaic_mhi_driver);
free_pci:
pci_unregister_driver(&qaic_pci_driver);
return ret;
@@ -611,6 +620,7 @@ static void __exit qaic_exit(void)
* reinitializing the link_up state after the cleanup is done.
*/
link_up = true;
+ qaic_timesync_deinit();
mhi_driver_unregister(&qaic_mhi_driver);
pci_unregister_driver(&qaic_pci_driver);
}
new file mode 100644
@@ -0,0 +1,245 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/mhi.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/time64.h>
+#include <linux/timer.h>
+
+#include "qaic.h"
+#include "qaic_timesync.h"
+
+#define QTIMER_REG_OFFSET 0xa28
+#define QAIC_TIMESYNC_SIGNATURE 0x55aa
+#define QAIC_CONV_QTIMER_TO_US(qtimer) (mul_u64_u32_div(qtimer, 10, 192))
+
+static unsigned int timesync_delay_ms = 1000; /* 1 sec default */
+module_param(timesync_delay_ms, uint, 0600);
+MODULE_PARM_DESC(timesync_delay_ms, "Delay in ms between two consecutive timesync operations");
+
+enum qts_msg_type {
+ QAIC_TS_SYNC_REQ = 1,
+ QAIC_TS_ACK_TO_HOST,
+ QAIC_TS_MSG_TYPE_MAX
+};
+
+/**
+ * struct qts_hdr - Timesync message header structure.
+ * @signature: Unique signature to identify the timesync message.
+ * @reserved_1: Reserved for future use.
+ * @reserved_2: Reserved for future use.
+ * @msg_type: sub-type of the timesync message.
+ * @reserved_3: Reserved for future use.
+ */
+struct qts_hdr {
+ __le16 signature;
+ __le16 reserved_1;
+ u8 reserved_2;
+ u8 msg_type;
+ __le16 reserved_3;
+} __packed;
+
+/**
+ * struct qts_timeval - Structure to carry time information.
+ * @tv_sec: Seconds part of the time.
+ * @tv_usec: uS (microseconds) part of the time.
+ */
+struct qts_timeval {
+ __le64 tv_sec;
+ __le64 tv_usec;
+} __packed;
+
+/**
+ * struct qts_host_time_sync_msg_data - Structure to denote the timesync message.
+ * @header: Header of the timesync message.
+ * @data: Time information.
+ */
+struct qts_host_time_sync_msg_data {
+ struct qts_hdr header;
+ struct qts_timeval data;
+} __packed;
+
+/**
+ * struct mqts_dev - MHI QAIC Timesync Control device.
+ * @qdev: Pointer to the root device struct driven by QAIC driver.
+ * @mhi_dev: Pointer to associated MHI device.
+ * @timer: Timer handle used for timesync.
+ * @qtimer_addr: Device QTimer register pointer.
+ * @buff_in_use: atomic variable to track if the sync_msg buffer is in use.
+ * @dev: Device pointer to qdev->pdev->dev stored for easy access.
+ * @sync_msg: Buffer used to send timesync message over MHI.
+ */
+struct mqts_dev {
+ struct qaic_device *qdev;
+ struct mhi_device *mhi_dev;
+ struct timer_list timer;
+ void __iomem *qtimer_addr;
+ atomic_t buff_in_use;
+ struct device *dev;
+ struct qts_host_time_sync_msg_data *sync_msg;
+};
+
+#ifdef readq
+static u64 read_qtimer(const volatile void __iomem *addr)
+{
+ return readq(addr);
+}
+#else
+static u64 read_qtimer(const volatile void __iomem *addr)
+{
+ u64 low, high;
+
+ low = readl(addr);
+ high = readl(addr + sizeof(u32));
+ return low | (high << 32);
+}
+#endif
+
+static void qaic_timesync_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+ struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
+
+ dev_dbg(mqtsdev->dev, "%s status: %d xfer_len: %zu\n", __func__,
+ mhi_result->transaction_status, mhi_result->bytes_xferd);
+
+ atomic_set(&mqtsdev->buff_in_use, 0);
+}
+
+static void qaic_timesync_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
+{
+ struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
+
+ dev_err(mqtsdev->dev, "%s no data expected on dl channel\n", __func__);
+}
+
+static void qaic_timesync_timer(struct timer_list *t)
+{
+ struct mqts_dev *mqtsdev = from_timer(mqtsdev, t, timer);
+ struct qts_host_time_sync_msg_data *sync_msg;
+ u64 device_qtimer_us;
+ u64 device_qtimer;
+ u64 host_time_us;
+ u64 offset_us;
+ u64 host_sec;
+ int ret;
+
+ if (atomic_read(&mqtsdev->buff_in_use)) {
+ dev_dbg(mqtsdev->dev, "%s buffer not free, schedule next cycle\n", __func__);
+ goto mod_timer;
+ }
+ atomic_set(&mqtsdev->buff_in_use, 1);
+
+ sync_msg = mqtsdev->sync_msg;
+ sync_msg->header.signature = cpu_to_le16(QAIC_TIMESYNC_SIGNATURE);
+ sync_msg->header.msg_type = QAIC_TS_SYNC_REQ;
+ /* Read host UTC time and convert to uS*/
+ host_time_us = div_u64(ktime_get_real_ns(), NSEC_PER_USEC);
+ device_qtimer = read_qtimer(mqtsdev->qtimer_addr);
+ device_qtimer_us = QAIC_CONV_QTIMER_TO_US(device_qtimer);
+ /* Offset between host UTC and device time */
+ offset_us = host_time_us - device_qtimer_us;
+
+ host_sec = div_u64(offset_us, USEC_PER_SEC);
+ sync_msg->data.tv_usec = cpu_to_le64(offset_us - host_sec * USEC_PER_SEC);
+ sync_msg->data.tv_sec = cpu_to_le64(host_sec);
+ ret = mhi_queue_buf(mqtsdev->mhi_dev, DMA_TO_DEVICE, sync_msg, sizeof(*sync_msg), MHI_EOT);
+ if (ret && (ret != -EAGAIN)) {
+ dev_err(mqtsdev->dev, "%s unable to queue to mhi:%d\n", __func__, ret);
+ return;
+ } else if (ret == -EAGAIN) {
+ atomic_set(&mqtsdev->buff_in_use, 0);
+ }
+
+mod_timer:
+ ret = mod_timer(t, jiffies + msecs_to_jiffies(timesync_delay_ms));
+ if (ret)
+ dev_err(mqtsdev->dev, "%s mod_timer error:%d\n", __func__, ret);
+}
+
+static int qaic_timesync_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
+{
+ struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
+ struct mqts_dev *mqtsdev;
+ struct timer_list *timer;
+ int ret;
+
+ mqtsdev = kzalloc(sizeof(*mqtsdev), GFP_KERNEL);
+ if (!mqtsdev) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ timer = &mqtsdev->timer;
+ mqtsdev->mhi_dev = mhi_dev;
+ mqtsdev->qdev = qdev;
+ mqtsdev->dev = &qdev->pdev->dev;
+
+ mqtsdev->sync_msg = kzalloc(sizeof(*mqtsdev->sync_msg), GFP_KERNEL);
+ if (!mqtsdev->sync_msg) {
+ ret = -ENOMEM;
+ goto free_mqts_dev;
+ }
+ atomic_set(&mqtsdev->buff_in_use, 0);
+
+ ret = mhi_prepare_for_transfer(mhi_dev);
+ if (ret)
+ goto free_sync_msg;
+
+ /* Qtimer register pointer */
+ mqtsdev->qtimer_addr = qdev->bar_0 + QTIMER_REG_OFFSET;
+ timer_setup(timer, qaic_timesync_timer, 0);
+ timer->expires = jiffies + msecs_to_jiffies(timesync_delay_ms);
+ add_timer(timer);
+ dev_set_drvdata(&mhi_dev->dev, mqtsdev);
+
+ return 0;
+
+free_sync_msg:
+ kfree(mqtsdev->sync_msg);
+free_mqts_dev:
+ kfree(mqtsdev);
+out:
+ return ret;
+};
+
+static void qaic_timesync_remove(struct mhi_device *mhi_dev)
+{
+ struct mqts_dev *mqtsdev = dev_get_drvdata(&mhi_dev->dev);
+
+ del_timer_sync(&mqtsdev->timer);
+ mhi_unprepare_from_transfer(mqtsdev->mhi_dev);
+ kfree(mqtsdev->sync_msg);
+ kfree(mqtsdev);
+}
+
+static const struct mhi_device_id qaic_timesync_match_table[] = {
+ { .chan = "QAIC_TIMESYNC_PERIODIC"},
+ {},
+};
+
+MODULE_DEVICE_TABLE(mhi, qaic_timesync_match_table);
+
+static struct mhi_driver qaic_timesync_driver = {
+ .id_table = qaic_timesync_match_table,
+ .remove = qaic_timesync_remove,
+ .probe = qaic_timesync_probe,
+ .ul_xfer_cb = qaic_timesync_ul_xfer_cb,
+ .dl_xfer_cb = qaic_timesync_dl_xfer_cb,
+ .driver = {
+ .name = "qaic_timesync_periodic",
+ },
+};
+
+int qaic_timesync_init(void)
+{
+ return mhi_driver_register(&qaic_timesync_driver);
+}
+
+void qaic_timesync_deinit(void)
+{
+ mhi_driver_unregister(&qaic_timesync_driver);
+}
new file mode 100644
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __QAIC_TIMESYNC_H__
+#define __QAIC_TIMESYNC_H__
+
+int qaic_timesync_init(void);
+void qaic_timesync_deinit(void);
+#endif /* __QAIC_TIMESYNC_H__ */