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authorBean Huo <beanhuo@micron.com>2023-12-13 01:08:24 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2023-12-14 07:16:11 +0300
commit6bf999e0eb41850d5c857102535d5c53b2ede224 (patch)
treeb5fa910183e009dcd897130c1ebd5ceaf87feda9 /include/ufs
parent9fa268875ca4ff5cad0c1b957388a0aef39920c3 (diff)
downloadlinux-6bf999e0eb41850d5c857102535d5c53b2ede224.tar.xz
scsi: ufs: core: Add UFS RTC support
Add Real Time Clock (RTC) support for UFS device. This enhancement is crucial for the internal maintenance operations of the UFS device. The patch enables the device to handle both absolute and relative time information. Furthermore, it includes periodic task to update the RTC in accordance with the UFS Spec, ensuring the accuracy of RTC information for the device's internal processes. RTC and qTimestamp serve distinct purposes. The RTC provides a coarse level of granularity with, at best, approximate single-second resolution. This makes the RTC well-suited for the device to determine the approximate age of programmed blocks after being updated by the host. On the other hand, qTimestamp offers nanosecond granularity and is specifically designed for synchronizing Device Error Log entries with corresponding host-side logs. Given that the RTC has been a standard feature since UFS Spec 2.0, and qTimestamp was introduced in UFS Spec 4.0, the majority of UFS devices currently on the market rely on RTC. Therefore, it is advisable to continue supporting RTC in the Linux kernel. This ensures compatibility with the prevailing UFS device implementations and facilitates seamless integration with existing hardware. By maintaining support for RTC, we ensure broad compatibility and avoid potential issues arising from deviations in device specifications across different UFS versions. Signed-off-by: Bean Huo <beanhuo@micron.com> Signed-off-by: Mike Bi <mikebi@micron.com> Signed-off-by: Luca Porzio <lporzio@micron.com> Link: https://lore.kernel.org/r/20231212220825.85255-3-beanhuo@iokpp.de Acked-by: Avri Altman <avri.altman@wdc.com> Reviewed-by: Thomas Weißschuh <linux@weissschuh.net> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/ufs')
-rw-r--r--include/ufs/ufs.h13
-rw-r--r--include/ufs/ufshcd.h4
2 files changed, 17 insertions, 0 deletions
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index e77ab1786856..7e7169d94596 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -14,6 +14,7 @@
#include <linux/bitops.h>
#include <linux/types.h>
#include <uapi/scsi/scsi_bsg_ufs.h>
+#include <linux/time64.h>
/*
* Using static_assert() is not allowed in UAPI header files. Hence the check
@@ -551,6 +552,14 @@ struct ufs_vreg_info {
struct ufs_vreg *vdd_hba;
};
+/* UFS device descriptor wPeriodicRTCUpdate bit9 defines RTC time baseline */
+#define UFS_RTC_TIME_BASELINE BIT(9)
+
+enum ufs_rtc_time {
+ UFS_RTC_RELATIVE,
+ UFS_RTC_ABSOLUTE
+};
+
struct ufs_dev_info {
bool f_power_on_wp_en;
/* Keeps information if any of the LU is power on write protected */
@@ -578,6 +587,10 @@ struct ufs_dev_info {
/* UFS EXT_IID Enable */
bool b_ext_iid_en;
+
+ /* UFS RTC */
+ enum ufs_rtc_time rtc_type;
+ time64_t rtc_time_baseline;
};
/*
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 7f0b2c5599cd..7bdda92fcb1c 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -911,6 +911,8 @@ enum ufshcd_mcq_opr {
* @mcq_base: Multi circular queue registers base address
* @uhq: array of supported hardware queues
* @dev_cmd_queue: Queue for issuing device management commands
+ * @mcq_opr: MCQ operation and runtime registers
+ * @ufs_rtc_update_work: A work for UFS RTC periodic update
*/
struct ufs_hba {
void __iomem *mmio_base;
@@ -1071,6 +1073,8 @@ struct ufs_hba {
struct ufs_hw_queue *uhq;
struct ufs_hw_queue *dev_cmd_queue;
struct ufshcd_mcq_opr_info_t mcq_opr[OPR_MAX];
+
+ struct delayed_work ufs_rtc_update_work;
};
/**