linux-kernel - [PATCH 2/3] firmware: xilinx: Add support for GET_LAST_RESET

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Date:   Wed,  9 Sep 2020 17:20:03 -0700
From:   Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
To:     ard.biesheuvel@...aro.org, mingo@...nel.org,
        gregkh@...uxfoundation.org, matt@...eblueprint.co.uk,
        sudeep.holla@....com, hkallweit1@...il.com, keescook@...omium.org,
        dmitry.torokhov@...il.com, michal.simek@...inx.com,
        rajanv@...inx.com, tejas.patel@...inx.com, jollys@...inx.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        rajan.vaja@...inx.com, jolly.shah@...inx.com,
        Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
Subject: [PATCH 2/3] firmware: xilinx: Add support for GET_LAST_RESET_REASON IOCTL

From: Tejas Patel <tejas.patel@...inx.com>

Add support to get last reason using IOCTL API. Also validate IOCTL
ID for Versal or ZynqMP platforms before calling
zynqmp_pm_invoke_fn().

Signed-off-by: Tejas Patel <tejas.patel@...inx.com>
Signed-off-by: Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
---
 drivers/firmware/xilinx/zynqmp.c     | 20 ++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  7 +++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 8fe0912..c5db34f 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -533,6 +533,7 @@ static inline int versal_is_valid_ioctl(u32 ioctl_id)
        case IOCTL_WRITE_PGGS:
        case IOCTL_READ_PGGS:
        case IOCTL_SET_BOOT_HEALTH_STATUS:
+       case IOCTL_GET_LAST_RESET_REASON:
                return 1;
        default:
                return 0;
@@ -772,6 +773,25 @@ int zynqmp_pm_set_boot_health_status(u32 value)
 }

 /**
+ * zynqmp_pm_get_last_reset_reason() - PM API for getting last reset reason
+ *
+ * @reset_reason:      last reset reason
+ *
+ * This function returns last reset reason
+ *
+ * Return: Returns status, either success or error+reason
+ */
+int zynqmp_pm_get_last_reset_reason(u32 *reset_reason)
+{
+       if (!reset_reason)
+               return -EINVAL;
+
+       return zynqmp_pm_ioctl(0, IOCTL_GET_LAST_RESET_REASON, 0, 0,
+                              reset_reason);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_get_last_reset_reason);
+
+/**
  * zynqmp_pm_reset_assert - Request setting of reset (1 - assert, 0 - release)
  * @reset:             Reset to be configured
  * @assert_flag:       Flag stating should reset be asserted (1) or
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 5968df8..90c8664 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -116,6 +116,8 @@ enum pm_ioctl_id {
        IOCTL_READ_PGGS = 15,
        /* Set healthy bit value */
        IOCTL_SET_BOOT_HEALTH_STATUS = 17,
+       /* IOCTL to get last reset reason */
+       IOCTL_GET_LAST_RESET_REASON = 23,
 };

 enum pm_query_id {
@@ -357,6 +359,7 @@ int zynqmp_pm_write_pggs(u32 index, u32 value);
 int zynqmp_pm_read_pggs(u32 index, u32 *value);
 int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype);
 int zynqmp_pm_set_boot_health_status(u32 value);
+int zynqmp_pm_get_last_reset_reason(u32 *reset_reason);
 #else
 static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
 {
@@ -507,6 +510,10 @@ static inline int zynqmp_pm_set_boot_health_status(u32 value)
 {
        return -ENODEV;
 }
+static inline int zynqmp_pm_get_last_reset_reason(u32 *reset_reason)
+{
+       return -ENODEV;
+}
 #endif

 #endif /* __FIRMWARE_ZYNQMP_H__ */
--
2.7.4

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