To: linus, alan
Cc: lkml
Subject: [PATCH] MC68681 DUART

From: Linux/m68k legacy

MC68681 DUART register definitions for the Amiga MultiFace III serial driver.
---
 drivers/char/mc68681.h |  131 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)

--- /dev/null
+++ b/drivers/char/mc68681.h
@@ -0,0 +1,131 @@
+#ifndef _MC68681_H_
+#define _MC68681_H_
+
+/*
+ * This describes an MC68681 DUART. It has almost only overlayed registers, which
+ * the structure very ugly.
+ * Note that the ri-register isn't really a register of the duart but a kludge of bsc
+ * to make the ring indicator available.
+ *
+ * The data came from the MFC-31-Developer Kit (from Ralph Seidel,
+ * zodiac@darkness.gun.de) and the data sheet of Phillip's clone device (SCN68681)
+ * (from Richard Hirst, srh@gpt.co.uk)
+ *
+ * 11.11.95 copyright Joerg Dorchain (dorchain@mpi-sb.mpg.de)
+ *
+ */
+
+struct duarthalf {
+union {
+volatile u_char mr1; /* rw */
+volatile u_char mr2; /* rw */
+}  mr;
+volatile u_char ri;   /* special, read */
+union {
+volatile u_char sr;  /* read */
+volatile u_char csr; /* write */
+} sr_csr;
+u_char pad1;
+volatile u_char cr; /* write */
+u_char pad2;
+union {
+volatile u_char rhr; /* read */
+volatile u_char thr; /* write */
+} hr;
+u_char pad3;
+};
+
+struct duart {
+struct duarthalf pa;
+union {
+volatile u_char ipcr; /* read */
+volatile u_char acr;  /* write */
+} ipcr_acr;
+u_char pad1;
+union {
+volatile u_char isr; /* read */
+volatile u_char imr; /* write */
+} ir;
+u_char pad2;
+volatile u_char ctu;
+u_char pad3;
+volatile u_char ctl;
+u_char pad4;
+struct duarthalf pb;
+volatile u_char ivr;
+u_char pad5;
+union {
+volatile u_char ipr; /* read */
+volatile u_char opcr; /* write */
+} ipr_opcr;
+u_char pad6;
+union {
+volatile u_char start; /* read */
+volatile u_char sopc; /* write */
+} start_sopc;
+u_char pad7;
+union {
+volatile u_char stop; /* read */
+volatile u_char ropc; /* write */
+} stop_ropc;
+u_char pad8;
+};
+
+#define MR1_BITS 3
+#define MR1_5BITS 0
+#define MR1_6BITS 1
+#define MR1_7BITS 2
+#define MR1_8BITS 3
+
+#define MR1_PARITY_ODD 4
+
+#define MR1_PARITY 24
+#define MR1_PARITY_WITH 0
+#define MR1_PARITY_FORCE 8
+#define MR1_PARITY_NO 16
+#define MR1_PARITY_MULTIDROP 24
+
+#define MR1_ERROR_BLOCK 32
+#define MR1_FFULL_IRQ 64
+#define MR1_RxRTS_ON 128
+
+#define MR2_STOPS 15
+#define MR2_1STOP 7
+#define MR2_2STOP 15
+
+#define MR2_CTS_ON 16
+#define MR2_TxRTS_ON 32
+
+#define MR2_MODE 192
+#define MR2_NORMAL 0
+#define MR2_ECHO 64
+#define MR2_LOCALLOOP 128
+#define MR2_REMOTELOOP 192
+
+#define CR_RXCOMMAND 3
+#define CR_NONE 0
+#define CR_RX_ON 1
+#define CR_RX_OFF 2
+#define CR_TXCOMMAND 12
+#define CR_TX_ON 4
+#define CR_TX_OFF 8
+#define CR_MISC 112
+#define CR_RESET_MR 16
+#define CR_RESET_RX 32
+#define CR_RESET_TX 48
+#define CR_RESET_ERR 64
+#define CR_RESET_BREAK 80
+#define CR_START_BREAK 96
+#define CR_STOP_BREAK 112
+
+#define SR_RXRDY 1
+#define SR_FFULL 2
+#define SR_TXRDY 4
+#define SR_TXEMPT 8
+#define SR_OVERRUN 16
+#define SR_PARITY 32
+#define SR_FRAMING 64
+#define SR_BREAK 128
+
+
+#endif