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-rw-r--r--drivers/ptp/ptp_vmw.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_vmw.c b/drivers/ptp/ptp_vmw.c
new file mode 100644
index 000000000000..5dca26e14bdc
--- /dev/null
+++ b/drivers/ptp/ptp_vmw.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+/*
+ * Copyright (C) 2020 VMware, Inc., Palo Alto, CA., USA
+ *
+ * PTP clock driver for VMware precision clock virtual device.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ptp_clock_kernel.h>
+#include <asm/hypervisor.h>
+#include <asm/vmware.h>
+
+#define VMWARE_MAGIC 0x564D5868
+#define VMWARE_CMD_PCLK(nr) ((nr << 16) | 97)
+#define VMWARE_CMD_PCLK_GETTIME VMWARE_CMD_PCLK(0)
+
+static struct acpi_device *ptp_vmw_acpi_device;
+static struct ptp_clock *ptp_vmw_clock;
+
+
+static int ptp_vmw_pclk_read(u64 *ns)
+{
+ u32 ret, nsec_hi, nsec_lo, unused1, unused2, unused3;
+
+ asm volatile (VMWARE_HYPERCALL :
+ "=a"(ret), "=b"(nsec_hi), "=c"(nsec_lo), "=d"(unused1),
+ "=S"(unused2), "=D"(unused3) :
+ "a"(VMWARE_MAGIC), "b"(0),
+ "c"(VMWARE_CMD_PCLK_GETTIME), "d"(0) :
+ "memory");
+
+ if (ret == 0)
+ *ns = ((u64)nsec_hi << 32) | nsec_lo;
+ return ret;
+}
+
+/*
+ * PTP clock ops.
+ */
+
+static int ptp_vmw_adjtime(struct ptp_clock_info *info, s64 delta)
+{
+ return -EOPNOTSUPP;
+}
+
+static int ptp_vmw_adjfreq(struct ptp_clock_info *info, s32 delta)
+{
+ return -EOPNOTSUPP;
+}
+
+static int ptp_vmw_gettime(struct ptp_clock_info *info, struct timespec64 *ts)
+{
+ u64 ns;
+
+ if (ptp_vmw_pclk_read(&ns) != 0)
+ return -EIO;
+ *ts = ns_to_timespec64(ns);
+ return 0;
+}
+
+static int ptp_vmw_settime(struct ptp_clock_info *info,
+ const struct timespec64 *ts)
+{
+ return -EOPNOTSUPP;
+}
+
+static int ptp_vmw_enable(struct ptp_clock_info *info,
+ struct ptp_clock_request *request, int on)
+{
+ return -EOPNOTSUPP;
+}
+
+static struct ptp_clock_info ptp_vmw_clock_info = {
+ .owner = THIS_MODULE,
+ .name = "ptp_vmw",
+ .max_adj = 0,
+ .adjtime = ptp_vmw_adjtime,
+ .adjfreq = ptp_vmw_adjfreq,
+ .gettime64 = ptp_vmw_gettime,
+ .settime64 = ptp_vmw_settime,
+ .enable = ptp_vmw_enable,
+};
+
+/*
+ * ACPI driver ops for VMware "precision clock" virtual device.
+ */
+
+static int ptp_vmw_acpi_add(struct acpi_device *device)
+{
+ ptp_vmw_clock = ptp_clock_register(&ptp_vmw_clock_info, NULL);
+ if (IS_ERR(ptp_vmw_clock)) {
+ pr_err("failed to register ptp clock\n");
+ return PTR_ERR(ptp_vmw_clock);
+ }
+
+ ptp_vmw_acpi_device = device;
+ return 0;
+}
+
+static int ptp_vmw_acpi_remove(struct acpi_device *device)
+{
+ ptp_clock_unregister(ptp_vmw_clock);
+ return 0;
+}
+
+static const struct acpi_device_id ptp_vmw_acpi_device_ids[] = {
+ { "VMW0005", 0 },
+ { "", 0 },
+};
+
+MODULE_DEVICE_TABLE(acpi, ptp_vmw_acpi_device_ids);
+
+static struct acpi_driver ptp_vmw_acpi_driver = {
+ .name = "ptp_vmw",
+ .ids = ptp_vmw_acpi_device_ids,
+ .ops = {
+ .add = ptp_vmw_acpi_add,
+ .remove = ptp_vmw_acpi_remove
+ },
+ .owner = THIS_MODULE
+};
+
+static int __init ptp_vmw_init(void)
+{
+ if (x86_hyper_type != X86_HYPER_VMWARE)
+ return -1;
+ return acpi_bus_register_driver(&ptp_vmw_acpi_driver);
+}
+
+static void __exit ptp_vmw_exit(void)
+{
+ acpi_bus_unregister_driver(&ptp_vmw_acpi_driver);
+}
+
+module_init(ptp_vmw_init);
+module_exit(ptp_vmw_exit);
+
+MODULE_DESCRIPTION("VMware virtual PTP clock driver");
+MODULE_AUTHOR("VMware, Inc.");
+MODULE_LICENSE("Dual BSD/GPL");