[PATCH v3 23/24] firmware: xilinx: Add sysfs to set shutdown scope

[Jolly Shah <jolly.shah@xilinx.com>]

From: Rajan Vaja <rajan.vaja@xilinx.com>

The Linux shutdown functionality implemented via PSCI system_off does
not include an option to set a scope, i.e. which parts of the system to
shut down.

This patch creates sysfs that allows to set the shutdown scope for the
next shutdown request. When the next shutdown is performed, the platform
specific portion of PSCI-system_off can use the chosen shutdown scope.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Stefan Krsmanovic <stefan.krsmanovic@aggios.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>
Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
---
 .../ABI/stable/sysfs-driver-firmware-zynqmp        |  32 +++++
 drivers/firmware/xilinx/zynqmp.c                   | 150 ++++++++++++++++++++-
 include/linux/firmware/xlnx-zynqmp.h               |  12 ++
 3 files changed, 193 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp
index 7fd6e70..b46ec0c 100644
--- a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp
+++ b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp
@@ -48,3 +48,35 @@ Description:
 		# echo 0xFFFFFFFF 0x1234ABCD > /sys/devices/platform/firmware\:zynqmp-firmware/pggs0
 
 Users:		Xilinx
+
+What:		/sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
+Date:		March 2020
+KernelVersion:	5.6
+Contact:	"Jolly Shah" <jollys@xilinx.com>
+Description:
+		This sysfs interface allows to set the shutdown scope for the
+		next shutdown request. When the next shutdown is performed, the
+		platform specific portion of PSCI-system_off can use the chosen
+		shutdown scope.
+
+		Following are available shutdown scopes(subtypes):
+
+		subsystem:	Only the APU along with all of its peripherals
+				not used by other processing units will be
+				shut down. This may result in the FPD power
+				domain being shut down provided that no other
+				processing unit uses FPD peripherals or DRAM.
+		ps_only:	The complete PS will be shut down, including the
+				RPU, PMU, etc.  Only the PL domain (FPGA)
+				remains untouched.
+		system:		The complete system/device is shut down.
+
+		Usage:
+		# cat /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
+		# echo <scope> > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
+
+		Example:
+		# cat /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
+		# echo "subsystem" > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
+
+Users:		Xilinx
diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index d3f637b..9caf1cf 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -847,6 +847,154 @@ int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype)
 }
 
 /**
+ * struct zynqmp_pm_shutdown_scope - Struct for shutdown scope
+ * @subtype:	Shutdown subtype
+ * @name:	Matching string for scope argument
+ *
+ * This struct encapsulates mapping between shutdown scope ID and string.
+ */
+struct zynqmp_pm_shutdown_scope {
+	const enum zynqmp_pm_shutdown_subtype subtype;
+	const char *name;
+};
+
+static struct zynqmp_pm_shutdown_scope shutdown_scopes[] = {
+	[ZYNQMP_PM_SHUTDOWN_SUBTYPE_SUBSYSTEM] = {
+		.subtype = ZYNQMP_PM_SHUTDOWN_SUBTYPE_SUBSYSTEM,
+		.name = "subsystem",
+	},
+	[ZYNQMP_PM_SHUTDOWN_SUBTYPE_PS_ONLY] = {
+		.subtype = ZYNQMP_PM_SHUTDOWN_SUBTYPE_PS_ONLY,
+		.name = "ps_only",
+	},
+	[ZYNQMP_PM_SHUTDOWN_SUBTYPE_SYSTEM] = {
+		.subtype = ZYNQMP_PM_SHUTDOWN_SUBTYPE_SYSTEM,
+		.name = "system",
+	},
+};
+
+static struct zynqmp_pm_shutdown_scope *selected_scope =
+		&shutdown_scopes[ZYNQMP_PM_SHUTDOWN_SUBTYPE_SYSTEM];
+
+/**
+ * zynqmp_pm_is_shutdown_scope_valid - Check if shutdown scope string is valid
+ * @scope_string:	Shutdown scope string
+ *
+ * Return:		Return pointer to matching shutdown scope struct from
+ *			array of available options in system if string is valid,
+ *			otherwise returns NULL.
+ */
+static struct zynqmp_pm_shutdown_scope*
+		zynqmp_pm_is_shutdown_scope_valid(const char *scope_string)
+{
+	int count;
+
+	for (count = 0; count < ARRAY_SIZE(shutdown_scopes); count++)
+		if (sysfs_streq(scope_string, shutdown_scopes[count].name))
+			return &shutdown_scopes[count];
+
+	return NULL;
+}
+
+/**
+ * shutdown_scope_show - Show shutdown_scope sysfs attribute
+ * @device:	Device structure
+ * @attr:	Device attribute structure
+ * @buf:	Requested available shutdown_scope attributes string
+ *
+ * User-space interface for viewing the available scope options for system
+ * shutdown. Scope option for next shutdown call is marked with [].
+ *
+ * Usage: cat /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
+ *
+ * Return:	Number of bytes printed into the buffer.
+ */
+static ssize_t shutdown_scope_show(struct device *device,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(shutdown_scopes); i++) {
+		if (&shutdown_scopes[i] == selected_scope) {
+			strcat(buf, "[");
+			strcat(buf, shutdown_scopes[i].name);
+			strcat(buf, "]");
+		} else {
+			strcat(buf, shutdown_scopes[i].name);
+		}
+		strcat(buf, " ");
+	}
+	strcat(buf, "\n");
+
+	return strlen(buf);
+}
+
+/**
+ * shutdown_scope_store - Store shutdown_scope sysfs attribute
+ * @device:	Device structure
+ * @attr:	Device attribute structure
+ * @buf:	User entered shutdown_scope attribute string
+ * @count:	Buffer size
+ *
+ * User-space interface for setting the scope for the next system shutdown.
+ * Usage: echo <scope> > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
+ *
+ * The Linux shutdown functionality implemented via PSCI system_off does not
+ * include an option to set a scope, i.e. which parts of the system to shut
+ * down.
+ *
+ * This API function allows to set the shutdown scope for the next shutdown
+ * request by passing it to the ATF running in EL3. When the next shutdown
+ * is performed, the platform specific portion of PSCI-system_off can use
+ * the chosen shutdown scope.
+ *
+ * subsystem:	Only the APU along with all of its peripherals not used by other
+ *		processing units will be shut down. This may result in the FPD
+ *		power domain being shut down provided that no other processing
+ *		unit uses FPD peripherals or DRAM.
+ * ps_only:	The complete PS will be shut down, including the RPU, PMU, etc.
+ *		Only the PL domain (FPGA) remains untouched.
+ * system:	The complete system/device is shut down.
+ *
+ * Return:	count argument if request succeeds, the corresponding error
+ *		code otherwise
+ */
+static ssize_t shutdown_scope_store(struct device *device,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	int ret;
+	struct zynqmp_pm_shutdown_scope *scope;
+
+	scope = zynqmp_pm_is_shutdown_scope_valid(buf);
+	if (!scope)
+		return -EINVAL;
+
+	ret = zynqmp_pm_system_shutdown(ZYNQMP_PM_SHUTDOWN_TYPE_SETSCOPE_ONLY,
+					scope->subtype);
+	if (ret) {
+		pr_err("unable to set shutdown scope %s\n", buf);
+		return ret;
+	}
+
+	selected_scope = scope;
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(shutdown_scope);
+
+static struct attribute *zynqmp_shutdown_scope_attrs[] = {
+	&dev_attr_shutdown_scope.attr,
+	NULL,
+};
+
+static const struct attribute_group shutdown_scope_attribute_group = {
+	.attrs = zynqmp_shutdown_scope_attrs,
+};
+
+/**
  * ggs_show - Show global general storage (ggs) sysfs attribute
  * @device: Device structure
  * @attr: Device attribute structure
@@ -955,7 +1103,6 @@ static ssize_t ggs_store(struct device *device,
 	ret = zynqmp_pm_write_ggs(reg, value);
 	if (ret)
 		count = -EFAULT;
-
 err:
 	kfree(kern_buff);
 
@@ -1159,6 +1306,7 @@ static const struct attribute_group ggs_attribute_group = {
 
 const struct attribute_group *firmware_attribute_groups[] = {
 	&ggs_attribute_group,
+	&shutdown_scope_attribute_group,
 	NULL,
 };
 
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 13b9fdb..31ed58c 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -280,6 +280,18 @@ enum tap_delay_type {
 	PM_TAPDELAY_OUTPUT,
 };
 
+enum zynqmp_pm_shutdown_type {
+	ZYNQMP_PM_SHUTDOWN_TYPE_SHUTDOWN,
+	ZYNQMP_PM_SHUTDOWN_TYPE_RESET,
+	ZYNQMP_PM_SHUTDOWN_TYPE_SETSCOPE_ONLY,
+};
+
+enum zynqmp_pm_shutdown_subtype {
+	ZYNQMP_PM_SHUTDOWN_SUBTYPE_SUBSYSTEM,
+	ZYNQMP_PM_SHUTDOWN_SUBTYPE_PS_ONLY,
+	ZYNQMP_PM_SHUTDOWN_SUBTYPE_SYSTEM,
+};
+
 /**
  * struct zynqmp_pm_query_data - PM query data
  * @qid:	query ID
-- 
2.7.4


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