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-rw-r--r--MAINTAINERS6
-rw-r--r--arch/s390/include/asm/stp.h1
-rw-r--r--arch/s390/include/asm/timex.h6
-rw-r--r--arch/s390/kernel/time.c6
-rw-r--r--drivers/ptp/Kconfig11
-rw-r--r--drivers/ptp/Makefile1
-rw-r--r--drivers/ptp/ptp_s390.c129
7 files changed, 160 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index f39ab140710f..c08624a073bc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20204,6 +20204,12 @@ F: Documentation/arch/s390/pci.rst
F: arch/s390/pci/
F: drivers/pci/hotplug/s390_pci_hpc.c
+S390 PTP DRIVER
+M: Sven Schnelle <[email protected]>
+L: [email protected]
+S: Supported
+F: drivers/ptp/ptp_s390.c
+
S390 SCM DRIVER
M: Vineeth Vijayan <[email protected]>
L: [email protected]
diff --git a/arch/s390/include/asm/stp.h b/arch/s390/include/asm/stp.h
index 4d74d7e33340..827cb208de86 100644
--- a/arch/s390/include/asm/stp.h
+++ b/arch/s390/include/asm/stp.h
@@ -94,5 +94,6 @@ struct stp_stzi {
int stp_sync_check(void);
int stp_island_check(void);
void stp_queue_work(void);
+bool stp_enabled(void);
#endif /* __S390_STP_H */
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index 640901f2fbc3..642fd303ce01 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -93,6 +93,7 @@ extern unsigned char ptff_function_mask[16];
#define PTFF_QAF 0x00 /* query available functions */
#define PTFF_QTO 0x01 /* query tod offset */
#define PTFF_QSI 0x02 /* query steering information */
+#define PTFF_QPT 0x03 /* query physical clock */
#define PTFF_QUI 0x04 /* query UTC information */
#define PTFF_ATO 0x40 /* adjust tod offset */
#define PTFF_STO 0x41 /* set tod offset */
@@ -250,6 +251,11 @@ static __always_inline unsigned long tod_to_ns(unsigned long todval)
return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
}
+static __always_inline u128 eitod_to_ns(u128 todval)
+{
+ return (todval * 125) >> 9;
+}
+
/**
* tod_after - compare two 64 bit TOD values
* @a: first 64 bit TOD timestamp
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 4214901c3ab0..cc60b16a7dd0 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -469,6 +469,12 @@ static void __init stp_reset(void)
}
}
+bool stp_enabled(void)
+{
+ return test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags) && stp_online;
+}
+EXPORT_SYMBOL(stp_enabled);
+
static void stp_timeout(struct timer_list *unused)
{
queue_work(time_sync_wq, &stp_work);
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index e98c9767e0ef..3eac514195af 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -237,4 +237,15 @@ config PTP_DFL_TOD
To compile this driver as a module, choose M here: the module
will be called ptp_dfl_tod.
+config PTP_S390
+ tristate "S390 PTP driver"
+ depends on PTP_1588_CLOCK
+ depends on S390
+ help
+ This driver adds support for S390 time steering via the PtP
+ interface. This works by adding a in-kernel clock delta value,
+ which is always added to time values used in the kernel. The PtP
+ driver provides the raw clock value without the delta to
+ userspace. That way userspace programs like chrony could steer
+ the kernel clock.
endmenu
diff --git a/drivers/ptp/Makefile b/drivers/ptp/Makefile
index 01b5cd91eb61..25f846fe48c9 100644
--- a/drivers/ptp/Makefile
+++ b/drivers/ptp/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_PTP_1588_CLOCK_MOCK) += ptp_mock.o
obj-$(CONFIG_PTP_1588_CLOCK_VMW) += ptp_vmw.o
obj-$(CONFIG_PTP_1588_CLOCK_OCP) += ptp_ocp.o
obj-$(CONFIG_PTP_DFL_TOD) += ptp_dfl_tod.o
+obj-$(CONFIG_PTP_S390) += ptp_s390.o
diff --git a/drivers/ptp/ptp_s390.c b/drivers/ptp/ptp_s390.c
new file mode 100644
index 000000000000..29618eb9bf44
--- /dev/null
+++ b/drivers/ptp/ptp_s390.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * s390 PTP clock driver
+ *
+ */
+
+#include "ptp_private.h"
+#include <linux/time.h>
+#include <asm/stp.h>
+
+static struct ptp_clock *ptp_stcke_clock, *ptp_qpt_clock;
+
+static int ptp_s390_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+ return -EOPNOTSUPP;
+}
+
+static int ptp_s390_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ return -EOPNOTSUPP;
+}
+
+static struct timespec64 eitod_to_timespec64(union tod_clock *clk)
+{
+ return ns_to_timespec64(eitod_to_ns(clk->eitod - TOD_UNIX_EPOCH));
+}
+
+static struct timespec64 tod_to_timespec64(unsigned long tod)
+{
+ return ns_to_timespec64(tod_to_ns(tod - TOD_UNIX_EPOCH));
+}
+
+static int ptp_s390_stcke_gettime(struct ptp_clock_info *ptp,
+ struct timespec64 *ts)
+{
+ union tod_clock tod;
+
+ if (!stp_enabled())
+ return -EOPNOTSUPP;
+
+ store_tod_clock_ext(&tod);
+ *ts = eitod_to_timespec64(&tod);
+ return 0;
+}
+
+static int ptp_s390_qpt_gettime(struct ptp_clock_info *ptp,
+ struct timespec64 *ts)
+{
+ unsigned long tod;
+
+ ptff(&tod, sizeof(tod), PTFF_QPT);
+ *ts = tod_to_timespec64(tod);
+ return 0;
+}
+
+static int ptp_s390_settime(struct ptp_clock_info *ptp,
+ const struct timespec64 *ts)
+{
+ return -EOPNOTSUPP;
+}
+
+static int s390_arch_ptp_get_crosststamp(ktime_t *device_time,
+ struct system_counterval_t *system_counter,
+ void *ctx)
+{
+ union tod_clock clk;
+
+ store_tod_clock_ext(&clk);
+ *device_time = ns_to_ktime(tod_to_ns(clk.tod - TOD_UNIX_EPOCH));
+ system_counter->cycles = clk.tod;
+ system_counter->cs_id = CSID_S390_TOD;
+ return 0;
+}
+
+static int ptp_s390_getcrosststamp(struct ptp_clock_info *ptp,
+ struct system_device_crosststamp *xtstamp)
+{
+ if (!stp_enabled())
+ return -EOPNOTSUPP;
+ return get_device_system_crosststamp(s390_arch_ptp_get_crosststamp, NULL, NULL, xtstamp);
+}
+
+static struct ptp_clock_info ptp_s390_stcke_info = {
+ .owner = THIS_MODULE,
+ .name = "s390 STCKE Clock",
+ .max_adj = 0,
+ .adjfine = ptp_s390_adjfine,
+ .adjtime = ptp_s390_adjtime,
+ .gettime64 = ptp_s390_stcke_gettime,
+ .settime64 = ptp_s390_settime,
+ .getcrosststamp = ptp_s390_getcrosststamp,
+};
+
+static struct ptp_clock_info ptp_s390_qpt_info = {
+ .owner = THIS_MODULE,
+ .name = "s390 Physical Clock",
+ .max_adj = 0,
+ .adjfine = ptp_s390_adjfine,
+ .adjtime = ptp_s390_adjtime,
+ .gettime64 = ptp_s390_qpt_gettime,
+ .settime64 = ptp_s390_settime,
+};
+
+static __init int ptp_s390_init(void)
+{
+ ptp_stcke_clock = ptp_clock_register(&ptp_s390_stcke_info, NULL);
+ if (IS_ERR(ptp_stcke_clock))
+ return PTR_ERR(ptp_stcke_clock);
+
+ ptp_qpt_clock = ptp_clock_register(&ptp_s390_qpt_info, NULL);
+ if (IS_ERR(ptp_qpt_clock)) {
+ ptp_clock_unregister(ptp_stcke_clock);
+ return PTR_ERR(ptp_qpt_clock);
+ }
+ return 0;
+}
+
+static __exit void ptp_s390_exit(void)
+{
+ ptp_clock_unregister(ptp_qpt_clock);
+ ptp_clock_unregister(ptp_stcke_clock);
+}
+
+module_init(ptp_s390_init);
+module_exit(ptp_s390_exit);
+
+MODULE_AUTHOR("Sven Schnelle <[email protected]>");
+MODULE_DESCRIPTION("s390 Physical/STCKE Clock PtP Driver");
+MODULE_LICENSE("GPL");
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