rtc/tpo: Driver to support rtc and wakeup on PowerNV platform

The patch implements the OPAL rtc driver that binds with the rtc
driver subsystem. The driver uses the platform device infrastructure
to probe the rtc device and register it to rtc class framework. The
'wakeup' is supported depending upon the property 'has-tpo' present
in the OF node. It provides a way to load the generic rtc driver in
in the absence of an OPAL driver.

The patch also moves the existing OPAL rtc get/set time interfaces to the
new driver and exposes the necessary OPAL calls using EXPORT_SYMBOL_GPL.

Test results:
-------------
Host:
[root@tul169p1 ~]# ls -l /sys/class/rtc/
total 0
lrwxrwxrwx 1 root root 0 Oct 14 03:07 rtc0 -> ../../devices/opal-rtc/rtc/rtc0
[root@tul169p1 ~]# cat /sys/devices/opal-rtc/rtc/rtc0/time
08:10:07
[root@tul169p1 ~]# echo `date '+%s' -d '+ 2 minutes'` > /sys/class/rtc/rtc0/wakealarm
[root@tul169p1 ~]# cat /sys/class/rtc/rtc0/wakealarm
1413274345
[root@tul169p1 ~]#

FSP:
$ smgr mfgState
standby
$ rtim timeofday

System time is valid: 2014/10/14 08:12:04.225115

$ smgr mfgState
ipling
$

CC: devicetree@vger.kernel.org
CC: tglx@linutronix.de
CC: rtc-linux@googlegroups.com
CC: a.zummo@towertech.it
Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

11 files changed, 325 insertions, 50 deletions

diff --git a/Documentation/devicetree/bindings/rtc/rtc-opal.txt b/Documentation/devicetree/bindings/rtc/rtc-opal.txt
new file mode 100644
index 000000000000..af87e5ecac54
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-opal.txt
@@ -0,0 +1,16 @@
+IBM OPAL real-time clock
+------------------------
+
+Required properties:
+- comapatible: Should be "ibm,opal-rtc"
+
+Optional properties:
+- has-tpo: Decides if the wakeup is supported or not.
+
+Example:
+        rtc {
+                compatible = "ibm,opal-rtc";
+                has-tpo;
+                phandle = <0x10000029>;
+                linux,phandle = <0x10000029>;
+        };
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 5d073e50cac8..60250e2d1f0d 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -154,6 +154,8 @@ struct opal_sg_list {
 #define OPAL_HANDLE_HMI                         98
 #define OPAL_REGISTER_DUMP_REGION               101
 #define OPAL_UNREGISTER_DUMP_REGION             102
+#define OPAL_WRITE_TPO                          103
+#define OPAL_READ_TPO                           104
 #define OPAL_IPMI_SEND                          107
 #define OPAL_IPMI_RECV                          108
 
@@ -832,6 +834,9 @@ int64_t opal_rtc_read(__be32 *year_month_day,
                       __be64 *hour_minute_second_millisecond);
 int64_t opal_rtc_write(uint32_t year_month_day,
                        uint64_t hour_minute_second_millisecond);
+int64_t opal_tpo_read(uint64_t token, __be32 *year_mon_day, __be32 *hour_min);
+int64_t opal_tpo_write(uint64_t token, uint32_t year_mon_day,
+                       uint32_t hour_min);
 int64_t opal_cec_power_down(uint64_t request);
 int64_t opal_cec_reboot(void);
 int64_t opal_read_nvram(uint64_t buffer, uint64_t size, uint64_t offset);
@@ -1009,8 +1014,6 @@ extern int opal_async_wait_response(uint64_t token, struct opal_msg *msg);
 extern int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data);
 
 struct rtc_time;
-extern int opal_set_rtc_time(struct rtc_time *tm);
-extern void opal_get_rtc_time(struct rtc_time *tm);
 extern unsigned long opal_get_boot_time(void);
 extern void opal_nvram_init(void);
 extern void opal_flash_init(void);
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 9f8ea617ff2c..fa7c4f12104f 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -989,6 +989,7 @@ void GregorianDay(struct rtc_time * tm)
 
         tm->tm_wday = day % 7;
 }
+EXPORT_SYMBOL_GPL(GregorianDay);
 
 void to_tm(int tim, struct rtc_time * tm)
 {
diff --git a/arch/powerpc/platforms/powernv/opal-async.c b/arch/powerpc/platforms/powernv/opal-async.c
index e462ab947d16..693b6cdac691 100644
--- a/arch/powerpc/platforms/powernv/opal-async.c
+++ b/arch/powerpc/platforms/powernv/opal-async.c
@@ -71,6 +71,7 @@ int opal_async_get_token_interruptible(void)
 
         return token;
 }
+EXPORT_SYMBOL_GPL(opal_async_get_token_interruptible);
 
 int __opal_async_release_token(int token)
 {
@@ -102,6 +103,7 @@ int opal_async_release_token(int token)
 
         return 0;
 }
+EXPORT_SYMBOL_GPL(opal_async_release_token);
 
 int opal_async_wait_response(uint64_t token, struct opal_msg *msg)
 {
@@ -120,6 +122,7 @@ int opal_async_wait_response(uint64_t token, struct opal_msg *msg)
 
         return 0;
 }
+EXPORT_SYMBOL_GPL(opal_async_wait_response);
 
 static int opal_async_comp_event(struct notifier_block *nb,
                 unsigned long msg_type, void *msg)
diff --git a/arch/powerpc/platforms/powernv/opal-rtc.c b/arch/powerpc/platforms/powernv/opal-rtc.c
index 499707ddaa9c..37dbee15769f 100644
--- a/arch/powerpc/platforms/powernv/opal-rtc.c
+++ b/arch/powerpc/platforms/powernv/opal-rtc.c
@@ -15,6 +15,8 @@
 #include <linux/bcd.h>
 #include <linux/rtc.h>
 #include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
 
 #include <asm/opal.h>
 #include <asm/firmware.h>
@@ -43,7 +45,7 @@ unsigned long __init opal_get_boot_time(void)
         long rc = OPAL_BUSY;
 
         if (!opal_check_token(OPAL_RTC_READ))
-                goto out;
+                return 0;
 
         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
                 rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms);
@@ -53,62 +55,33 @@ unsigned long __init opal_get_boot_time(void)
                         mdelay(10);
         }
         if (rc != OPAL_SUCCESS)
-                goto out;
+                return 0;
 
         y_m_d = be32_to_cpu(__y_m_d);
         h_m_s_ms = be64_to_cpu(__h_m_s_ms);
         opal_to_tm(y_m_d, h_m_s_ms, &tm);
         return mktime(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
                       tm.tm_hour, tm.tm_min, tm.tm_sec);
-out:
-        ppc_md.get_rtc_time = NULL;
-        ppc_md.set_rtc_time = NULL;
-        return 0;
 }
 
-void opal_get_rtc_time(struct rtc_time *tm)
+static __init int opal_time_init(void)
 {
-        long rc = OPAL_BUSY;
-        u32 y_m_d;
-        u64 h_m_s_ms;
-        __be32 __y_m_d;
-        __be64 __h_m_s_ms;
+        struct platform_device *pdev;
+        struct device_node *rtc;
 
-        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
-                rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms);
-                if (rc == OPAL_BUSY_EVENT)
-                        opal_poll_events(NULL);
+        rtc = of_find_node_by_path("/ibm,opal/rtc");
+        if (rtc) {
+                pdev = of_platform_device_create(rtc, "opal-rtc", NULL);
+                of_node_put(rtc);
+        } else {
+                if (opal_check_token(OPAL_RTC_READ) ||
+                    opal_check_token(OPAL_READ_TPO))
+                        pdev = platform_device_register_simple("opal-rtc", -1,
+                                                               NULL, 0);
                 else
-                        mdelay(10);
+                        return -ENODEV;
         }
-        if (rc != OPAL_SUCCESS)
-                return;
-        y_m_d = be32_to_cpu(__y_m_d);
-        h_m_s_ms = be64_to_cpu(__h_m_s_ms);
-        opal_to_tm(y_m_d, h_m_s_ms, tm);
-}
-
-int opal_set_rtc_time(struct rtc_time *tm)
-{
-        long rc = OPAL_BUSY;
-        u32 y_m_d = 0;
-        u64 h_m_s_ms = 0;
-
-        y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) / 100)) << 24;
-        y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) % 100)) << 16;
-        y_m_d |= ((u32)bin2bcd((tm->tm_mon + 1))) << 8;
-        y_m_d |= ((u32)bin2bcd(tm->tm_mday));
-
-        h_m_s_ms |= ((u64)bin2bcd(tm->tm_hour)) << 56;
-        h_m_s_ms |= ((u64)bin2bcd(tm->tm_min)) << 48;
-        h_m_s_ms |= ((u64)bin2bcd(tm->tm_sec)) << 40;
 
-        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
-                rc = opal_rtc_write(y_m_d, h_m_s_ms);
-                if (rc == OPAL_BUSY_EVENT)
-                        opal_poll_events(NULL);
-                else
-                        mdelay(10);
-        }
-        return rc == OPAL_SUCCESS ? 0 : -EIO;
+        return PTR_ERR_OR_ZERO(pdev);
 }
+machine_subsys_initcall(powernv, opal_time_init);
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index 59978af9babe..0a299be588af 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -250,5 +250,7 @@ OPAL_CALL(opal_handle_hmi,			OPAL_HANDLE_HMI);
 OPAL_CALL(opal_register_dump_region,            OPAL_REGISTER_DUMP_REGION);
 OPAL_CALL(opal_unregister_dump_region,          OPAL_UNREGISTER_DUMP_REGION);
 OPAL_CALL(opal_pci_set_phb_cxl_mode,            OPAL_PCI_SET_PHB_CXL_MODE);
+OPAL_CALL(opal_tpo_write,                       OPAL_WRITE_TPO);
+OPAL_CALL(opal_tpo_read,                        OPAL_READ_TPO);
 OPAL_CALL(opal_ipmi_send,                       OPAL_IPMI_SEND);
 OPAL_CALL(opal_ipmi_recv,                       OPAL_IPMI_RECV);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 0297702e8ae9..a1c37f9d60d2 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -819,3 +819,9 @@ void opal_free_sg_list(struct opal_sg_list *sg)
                         sg = NULL;
         }
 }
+
+EXPORT_SYMBOL_GPL(opal_poll_events);
+EXPORT_SYMBOL_GPL(opal_rtc_read);
+EXPORT_SYMBOL_GPL(opal_rtc_write);
+EXPORT_SYMBOL_GPL(opal_tpo_read);
+EXPORT_SYMBOL_GPL(opal_tpo_write);
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 941831d67cb2..30b1c3e298a6 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -265,8 +265,6 @@ static unsigned long pnv_memory_block_size(void)
 static void __init pnv_setup_machdep_opal(void)
 {
         ppc_md.get_boot_time = opal_get_boot_time;
-        ppc_md.get_rtc_time = opal_get_rtc_time;
-        ppc_md.set_rtc_time = opal_set_rtc_time;
         ppc_md.restart = pnv_restart;
         pm_power_off = pnv_power_off;
         ppc_md.halt = pnv_halt;
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 6dd12ddbabc6..c8f0ec7464ce 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -979,6 +979,17 @@ config RTC_DRV_NUC900
           If you say yes here you get support for the RTC subsystem of the
           NUC910/NUC920 used in embedded systems.
 
+config RTC_DRV_OPAL
+        tristate "IBM OPAL RTC driver"
+        depends on PPC_POWERNV
+        default y
+        help
+          If you say yes here you get support for the PowerNV platform RTC
+          driver based on OPAL interfaces.
+
+          This driver can also be built as a module. If so, the module
+          will be called rtc-opal.
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_DAVINCI
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index b188323c096a..c8ef3e1e6ccd 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_RTC_DRV_MSM6242)	+= rtc-msm6242.o
 obj-$(CONFIG_RTC_DRV_MPC5121)   += rtc-mpc5121.o
 obj-$(CONFIG_RTC_DRV_MV)        += rtc-mv.o
 obj-$(CONFIG_RTC_DRV_NUC900)    += rtc-nuc900.o
+obj-$(CONFIG_RTC_DRV_OPAL)      += rtc-opal.o
 obj-$(CONFIG_RTC_DRV_OMAP)      += rtc-omap.o
 obj-$(CONFIG_RTC_DRV_PALMAS)    += rtc-palmas.o
 obj-$(CONFIG_RTC_DRV_PCAP)      += rtc-pcap.o
diff --git a/drivers/rtc/rtc-opal.c b/drivers/rtc/rtc-opal.c
new file mode 100644
index 000000000000..95f652165fe9
--- /dev/null
+++ b/drivers/rtc/rtc-opal.c
@@ -0,0 +1,261 @@
+/*
+ * IBM OPAL RTC driver
+ * Copyright (C) 2014 IBM
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.
+ */
+
+#define DRVNAME         "rtc-opal"
+#define pr_fmt(fmt)     DRVNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/rtc.h>
+#include <linux/delay.h>
+#include <linux/bcd.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <asm/opal.h>
+#include <asm/firmware.h>
+
+static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm)
+{
+        tm->tm_year = ((bcd2bin(y_m_d >> 24) * 100) +
+                       bcd2bin((y_m_d >> 16) & 0xff)) - 1900;
+        tm->tm_mon  = bcd2bin((y_m_d >> 8) & 0xff) - 1;
+        tm->tm_mday = bcd2bin(y_m_d & 0xff);
+        tm->tm_hour = bcd2bin((h_m_s_ms >> 56) & 0xff);
+        tm->tm_min  = bcd2bin((h_m_s_ms >> 48) & 0xff);
+        tm->tm_sec  = bcd2bin((h_m_s_ms >> 40) & 0xff);
+
+        GregorianDay(tm);
+}
+
+static void tm_to_opal(struct rtc_time *tm, u32 *y_m_d, u64 *h_m_s_ms)
+{
+        *y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) / 100)) << 24;
+        *y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) % 100)) << 16;
+        *y_m_d |= ((u32)bin2bcd((tm->tm_mon + 1))) << 8;
+        *y_m_d |= ((u32)bin2bcd(tm->tm_mday));
+
+        *h_m_s_ms |= ((u64)bin2bcd(tm->tm_hour)) << 56;
+        *h_m_s_ms |= ((u64)bin2bcd(tm->tm_min)) << 48;
+        *h_m_s_ms |= ((u64)bin2bcd(tm->tm_sec)) << 40;
+}
+
+static int opal_get_rtc_time(struct device *dev, struct rtc_time *tm)
+{
+        long rc = OPAL_BUSY;
+        u32 y_m_d;
+        u64 h_m_s_ms;
+        __be32 __y_m_d;
+        __be64 __h_m_s_ms;
+
+        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
+                rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms);
+                if (rc == OPAL_BUSY_EVENT)
+                        opal_poll_events(NULL);
+                else
+                        msleep(10);
+        }
+
+        if (rc != OPAL_SUCCESS)
+                return -EIO;
+
+        y_m_d = be32_to_cpu(__y_m_d);
+        h_m_s_ms = be64_to_cpu(__h_m_s_ms);
+        opal_to_tm(y_m_d, h_m_s_ms, tm);
+
+        return 0;
+}
+
+static int opal_set_rtc_time(struct device *dev, struct rtc_time *tm)
+{
+        long rc = OPAL_BUSY;
+        u32 y_m_d = 0;
+        u64 h_m_s_ms = 0;
+
+        tm_to_opal(tm, &y_m_d, &h_m_s_ms);
+        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
+                rc = opal_rtc_write(y_m_d, h_m_s_ms);
+                if (rc == OPAL_BUSY_EVENT)
+                        opal_poll_events(NULL);
+                else
+                        msleep(10);
+        }
+
+        return rc == OPAL_SUCCESS ? 0 : -EIO;
+}
+
+/*
+ * TPO  Timed Power-On
+ *
+ * TPO get/set OPAL calls care about the hour and min and to make it consistent
+ * with the rtc utility time conversion functions, we use the 'u64' to store
+ * its value and perform bit shift by 32 before use..
+ */
+static int opal_get_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
+{
+        __be32 __y_m_d, __h_m;
+        struct opal_msg msg;
+        int rc, token;
+        u64 h_m_s_ms;
+        u32 y_m_d;
+
+        token = opal_async_get_token_interruptible();
+        if (token < 0) {
+                if (token != -ERESTARTSYS)
+                        pr_err("Failed to get the async token\n");
+
+                return token;
+        }
+
+        rc = opal_tpo_read(token, &__y_m_d, &__h_m);
+        if (rc != OPAL_ASYNC_COMPLETION) {
+                rc = -EIO;
+                goto exit;
+        }
+
+        rc = opal_async_wait_response(token, &msg);
+        if (rc) {
+                rc = -EIO;
+                goto exit;
+        }
+
+        rc = be64_to_cpu(msg.params[1]);
+        if (rc != OPAL_SUCCESS) {
+                rc = -EIO;
+                goto exit;
+        }
+
+        y_m_d = be32_to_cpu(__y_m_d);
+        h_m_s_ms = ((u64)be32_to_cpu(__h_m) << 32);
+        opal_to_tm(y_m_d, h_m_s_ms, &alarm->time);
+
+exit:
+        opal_async_release_token(token);
+        return rc;
+}
+
+/* Set Timed Power-On */
+static int opal_set_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
+{
+        u64 h_m_s_ms = 0, token;
+        struct opal_msg msg;
+        u32 y_m_d = 0;
+        int rc;
+
+        tm_to_opal(&alarm->time, &y_m_d, &h_m_s_ms);
+
+        token = opal_async_get_token_interruptible();
+        if (token < 0) {
+                if (token != -ERESTARTSYS)
+                        pr_err("Failed to get the async token\n");
+
+                return token;
+        }
+
+        /* TPO, we care about hour and minute */
+        rc = opal_tpo_write(token, y_m_d,
+                            (u32)((h_m_s_ms >> 32) & 0xffff0000));
+        if (rc != OPAL_ASYNC_COMPLETION) {
+                rc = -EIO;
+                goto exit;
+        }
+
+        rc = opal_async_wait_response(token, &msg);
+        if (rc) {
+                rc = -EIO;
+                goto exit;
+        }
+
+        rc = be64_to_cpu(msg.params[1]);
+        if (rc != OPAL_SUCCESS)
+                rc = -EIO;
+
+exit:
+        opal_async_release_token(token);
+        return rc;
+}
+
+static const struct rtc_class_ops opal_rtc_ops = {
+        .read_time      = opal_get_rtc_time,
+        .set_time       = opal_set_rtc_time,
+        .read_alarm     = opal_get_tpo_time,
+        .set_alarm      = opal_set_tpo_time,
+};
+
+static int opal_rtc_probe(struct platform_device *pdev)
+{
+        struct rtc_device *rtc;
+
+        if (pdev->dev.of_node && of_get_property(pdev->dev.of_node, "has-tpo",
+                                                 NULL))
+                device_set_wakeup_capable(&pdev->dev, true);
+
+        rtc = devm_rtc_device_register(&pdev->dev, DRVNAME, &opal_rtc_ops,
+                                       THIS_MODULE);
+        if (IS_ERR(rtc))
+                return PTR_ERR(rtc);
+
+        rtc->uie_unsupported = 1;
+
+        return 0;
+}
+
+static const struct of_device_id opal_rtc_match[] = {
+        {
+                .compatible     = "ibm,opal-rtc",
+        },
+        { }
+};
+MODULE_DEVICE_TABLE(of, opal_rtc_match);
+
+static const struct platform_device_id opal_rtc_driver_ids[] = {
+        {
+                .name           = "opal-rtc",
+        },
+        { }
+};
+MODULE_DEVICE_TABLE(platform, opal_rtc_driver_ids);
+
+static struct platform_driver opal_rtc_driver = {
+        .probe          = opal_rtc_probe,
+        .id_table       = opal_rtc_driver_ids,
+        .driver         = {
+                .name           = DRVNAME,
+                .owner          = THIS_MODULE,
+                .of_match_table = opal_rtc_match,
+        },
+};
+
+static int __init opal_rtc_init(void)
+{
+        if (!firmware_has_feature(FW_FEATURE_OPAL))
+                return -ENODEV;
+
+        return platform_driver_register(&opal_rtc_driver);
+}
+
+static void __exit opal_rtc_exit(void)
+{
+        platform_driver_unregister(&opal_rtc_driver);
+}
+
+MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
+MODULE_DESCRIPTION("IBM OPAL RTC driver");
+MODULE_LICENSE("GPL");
+
+module_init(opal_rtc_init);
+module_exit(opal_rtc_exit);