v4.19.13 snapshot.
diff --git a/include/linux/scc.h b/include/linux/scc.h
new file mode 100644
index 0000000..745eabd
--- /dev/null
+++ b/include/linux/scc.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* $Id: scc.h,v 1.29 1997/04/02 14:56:45 jreuter Exp jreuter $ */
+#ifndef _SCC_H
+#define _SCC_H
+
+#include <uapi/linux/scc.h>
+
+
+enum {TX_OFF, TX_ON}; /* command for scc_key_trx() */
+
+/* Vector masks in RR2B */
+
+#define VECTOR_MASK 0x06
+#define TXINT 0x00
+#define EXINT 0x02
+#define RXINT 0x04
+#define SPINT 0x06
+
+#ifdef CONFIG_SCC_DELAY
+#define Inb(port) inb_p(port)
+#define Outb(port, val) outb_p(val, port)
+#else
+#define Inb(port) inb(port)
+#define Outb(port, val) outb(val, port)
+#endif
+
+/* SCC channel control structure for KISS */
+
+struct scc_kiss {
+ unsigned char txdelay; /* Transmit Delay 10 ms/cnt */
+ unsigned char persist; /* Persistence (0-255) as a % */
+ unsigned char slottime; /* Delay to wait on persistence hit */
+ unsigned char tailtime; /* Delay after last byte written */
+ unsigned char fulldup; /* Full Duplex mode 0=CSMA 1=DUP 2=ALWAYS KEYED */
+ unsigned char waittime; /* Waittime before any transmit attempt */
+ unsigned int maxkeyup; /* Maximum time to transmit (seconds) */
+ unsigned int mintime; /* Minimal offtime after MAXKEYUP timeout (seconds) */
+ unsigned int idletime; /* Maximum idle time in ALWAYS KEYED mode (seconds) */
+ unsigned int maxdefer; /* Timer for CSMA channel busy limit */
+ unsigned char tx_inhibit; /* Transmit is not allowed when set */
+ unsigned char group; /* Group ID for AX.25 TX interlocking */
+ unsigned char mode; /* 'normal' or 'hwctrl' mode (unused) */
+ unsigned char softdcd; /* Use DPLL instead of DCD pin for carrier detect */
+};
+
+
+/* SCC channel structure */
+
+struct scc_channel {
+ int init; /* channel exists? */
+
+ struct net_device *dev; /* link to device control structure */
+ struct net_device_stats dev_stat;/* device statistics */
+
+ char brand; /* manufacturer of the board */
+ long clock; /* used clock */
+
+ io_port ctrl; /* I/O address of CONTROL register */
+ io_port data; /* I/O address of DATA register */
+ io_port special; /* I/O address of special function port */
+ int irq; /* Number of Interrupt */
+
+ char option;
+ char enhanced; /* Enhanced SCC support */
+
+ unsigned char wreg[16]; /* Copy of last written value in WRx */
+ unsigned char status; /* Copy of R0 at last external interrupt */
+ unsigned char dcd; /* DCD status */
+
+ struct scc_kiss kiss; /* control structure for KISS params */
+ struct scc_stat stat; /* statistical information */
+ struct scc_modem modem; /* modem information */
+
+ struct sk_buff_head tx_queue; /* next tx buffer */
+ struct sk_buff *rx_buff; /* pointer to frame currently received */
+ struct sk_buff *tx_buff; /* pointer to frame currently transmitted */
+
+ /* Timer */
+ struct timer_list tx_t; /* tx timer for this channel */
+ struct timer_list tx_wdog; /* tx watchdogs */
+
+ /* Channel lock */
+ spinlock_t lock; /* Channel guard lock */
+};
+
+#endif /* defined(_SCC_H) */