v4.19.13 snapshot.
diff --git a/drivers/char/snsc.h b/drivers/char/snsc.h
new file mode 100644
index 0000000..e8c52c8
--- /dev/null
+++ b/drivers/char/snsc.h
@@ -0,0 +1,92 @@
+/*
+ * SN Platform system controller communication support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
+ */
+
+/*
+ * This file contains macros and data types for communication with the
+ * system controllers in SGI SN systems.
+ */
+
+#ifndef _SN_SYSCTL_H_
+#define _SN_SYSCTL_H_
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/semaphore.h>
+#include <asm/sn/types.h>
+
+#define CHUNKSIZE 127
+
+/* This structure is used to track an open subchannel. */
+struct subch_data_s {
+ nasid_t sd_nasid; /* node on which the subchannel was opened */
+ int sd_subch; /* subchannel number */
+ spinlock_t sd_rlock; /* monitor lock for rsv */
+ spinlock_t sd_wlock; /* monitor lock for wsv */
+ wait_queue_head_t sd_rq; /* wait queue for readers */
+ wait_queue_head_t sd_wq; /* wait queue for writers */
+ struct semaphore sd_rbs; /* semaphore for read buffer */
+ struct semaphore sd_wbs; /* semaphore for write buffer */
+
+ char sd_rb[CHUNKSIZE]; /* read buffer */
+ char sd_wb[CHUNKSIZE]; /* write buffer */
+};
+
+struct sysctl_data_s {
+ struct cdev scd_cdev; /* Character device info */
+ nasid_t scd_nasid; /* Node on which subchannels are opened. */
+};
+
+
+/* argument types */
+#define IR_ARG_INT 0x00 /* 4-byte integer (big-endian) */
+#define IR_ARG_ASCII 0x01 /* null-terminated ASCII string */
+#define IR_ARG_UNKNOWN 0x80 /* unknown data type. The low
+ * 7 bits will contain the data
+ * length. */
+#define IR_ARG_UNKNOWN_LENGTH_MASK 0x7f
+
+
+/* system controller event codes */
+#define EV_CLASS_MASK 0xf000ul
+#define EV_SEVERITY_MASK 0x0f00ul
+#define EV_COMPONENT_MASK 0x00fful
+
+#define EV_CLASS_POWER 0x1000ul
+#define EV_CLASS_FAN 0x2000ul
+#define EV_CLASS_TEMP 0x3000ul
+#define EV_CLASS_ENV 0x4000ul
+#define EV_CLASS_TEST_FAULT 0x5000ul
+#define EV_CLASS_TEST_WARNING 0x6000ul
+#define EV_CLASS_PWRD_NOTIFY 0x8000ul
+
+/* ENV class codes */
+#define ENV_PWRDN_PEND 0x4101ul
+
+#define EV_SEVERITY_POWER_STABLE 0x0000ul
+#define EV_SEVERITY_POWER_LOW_WARNING 0x0100ul
+#define EV_SEVERITY_POWER_HIGH_WARNING 0x0200ul
+#define EV_SEVERITY_POWER_HIGH_FAULT 0x0300ul
+#define EV_SEVERITY_POWER_LOW_FAULT 0x0400ul
+
+#define EV_SEVERITY_FAN_STABLE 0x0000ul
+#define EV_SEVERITY_FAN_WARNING 0x0100ul
+#define EV_SEVERITY_FAN_FAULT 0x0200ul
+
+#define EV_SEVERITY_TEMP_STABLE 0x0000ul
+#define EV_SEVERITY_TEMP_ADVISORY 0x0100ul
+#define EV_SEVERITY_TEMP_CRITICAL 0x0200ul
+#define EV_SEVERITY_TEMP_FAULT 0x0300ul
+
+void scdrv_event_init(struct sysctl_data_s *);
+
+#endif /* _SN_SYSCTL_H_ */