[PATCH] dz: Fixes to make it work

This a set of fixes mostly to make the driver actually work:

1. Actually select the line for setting parameters and receiver
   disable/enable.
2. Select the line for receive and transmit interrupt handling correctly.
3. Report the transmitter empty state correctly.
4. Set the I/O type of ports correctly.
5. Perform polled transmission correctly.
6. Don't fix the console line at ttyS3.
7. Magic SysRq support.
8. Various small bits here and there.

Tested with a DECstation 2100 (thanks Flo for making this possible).

[akpm@osdl.org: fix typo]
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/decserial.c

@@ -23,20 +23,12 @@
 extern int zs_init(void);
 #endif
 
-#ifdef CONFIG_DZ
-extern int dz_init(void);
-#endif
-
 #ifdef CONFIG_SERIAL_CONSOLE
 
 #ifdef CONFIG_ZS
 extern void zs_serial_console_init(void);
 #endif
 
-#ifdef CONFIG_DZ
-extern void dz_serial_console_init(void);
-#endif
-
 #endif
 
 /* rs_init - starts up the serial interface -
@@ -46,23 +38,11 @@ extern void dz_serial_console_init(void);
 
 int __init rs_init(void)
 {
-
-#if defined(CONFIG_ZS) && defined(CONFIG_DZ)
+#ifdef CONFIG_ZS
     if (IOASIC)
 	return zs_init();
-    else
-	return dz_init();
-#else
-
-#ifdef CONFIG_ZS
-    return zs_init();
-#endif
-
-#ifdef CONFIG_DZ
-    return dz_init();
-#endif
-
 #endif
+    return -ENXIO;
 }
 
 __initcall(rs_init);
@@ -76,21 +56,9 @@ __initcall(rs_init);
  */
 static int __init decserial_console_init(void)
 {
-#if defined(CONFIG_ZS) && defined(CONFIG_DZ)
+#ifdef CONFIG_ZS
     if (IOASIC)
 	zs_serial_console_init();
-    else
-	dz_serial_console_init();
-#else
-
-#ifdef CONFIG_ZS
-    zs_serial_console_init();
-#endif
-
-#ifdef CONFIG_DZ
-    dz_serial_console_init();
-#endif
-
 #endif
     return 0;
 }

drivers/serial/dz.h

 /*
- * dz.h: Serial port driver for DECStations equiped 
+ * dz.h: Serial port driver for DECstations equipped
  *       with the DZ chipset.
  *
  * Copyright (C) 1998 Olivier A. D. Lebaillif 
  *             
  * Email: olivier.lebaillif@ifrsys.com
  *
+ * Copyright (C) 2004, 2006  Maciej W. Rozycki
  */
 #ifndef DZ_SERIAL_H
 #define DZ_SERIAL_H
 
 /*
- * Definitions for the Control and Status Received.
+ * Definitions for the Control and Status Register.
  */
 #define DZ_TRDY        0x8000                 /* Transmitter empty */
-#define DZ_TIE         0x4000                 /* Transmitter Interrupt Enable */
+#define DZ_TIE         0x4000                 /* Transmitter Interrupt Enbl */
+#define DZ_TLINE       0x0300                 /* Transmitter Line Number */
 #define DZ_RDONE       0x0080                 /* Receiver data ready */
 #define DZ_RIE         0x0040                 /* Receive Interrupt Enable */
 #define DZ_MSE         0x0020                 /* Master Scan Enable */
@@ -22,32 +24,44 @@
 #define DZ_MAINT       0x0008                 /* Loop Back Mode */
 
 /*
- * Definitions for the Received buffer. 
+ * Definitions for the Receiver Buffer Register.
  */
-#define DZ_RBUF_MASK   0x00FF                 /* Data Mask in the Receive Buffer */
-#define DZ_LINE_MASK   0x0300                 /* Line Mask in the Receive Buffer */
+#define DZ_RBUF_MASK   0x00FF                 /* Data Mask */
+#define DZ_LINE_MASK   0x0300                 /* Line Mask */
 #define DZ_DVAL        0x8000                 /* Valid Data indicator */
 #define DZ_OERR        0x4000                 /* Overrun error indicator */
 #define DZ_FERR        0x2000                 /* Frame error indicator */
 #define DZ_PERR        0x1000                 /* Parity error indicator */
 
-#define LINE(x) (x & DZ_LINE_MASK) >> 8       /* Get the line number from the input buffer */
-#define UCHAR(x) (unsigned char)(x & DZ_RBUF_MASK)
+#define LINE(x) ((x & DZ_LINE_MASK) >> 8)     /* Get the line number
+                                                 from the input buffer */
+#define UCHAR(x) ((unsigned char)(x & DZ_RBUF_MASK))
 
 /*
- * Definitions for the Transmit Register.
+ * Definitions for the Transmit Control Register.
  */
 #define DZ_LINE_KEYBOARD 0x0001
 #define DZ_LINE_MOUSE    0x0002
 #define DZ_LINE_MODEM    0x0004
 #define DZ_LINE_PRINTER  0x0008
 
+#define DZ_MODEM_RTS     0x0800               /* RTS for the modem line (2) */
 #define DZ_MODEM_DTR     0x0400               /* DTR for the modem line (2) */
+#define DZ_PRINT_RTS     0x0200               /* RTS for the prntr line (3) */
+#define DZ_PRINT_DTR     0x0100               /* DTR for the prntr line (3) */
+#define DZ_LNENB         0x000f               /* Transmitter Line Enable */
 
 /*
  * Definitions for the Modem Status Register.
  */
+#define DZ_MODEM_RI      0x0800               /* RI for the modem line (2) */
+#define DZ_MODEM_CD      0x0400               /* CD for the modem line (2) */
 #define DZ_MODEM_DSR     0x0200               /* DSR for the modem line (2) */
+#define DZ_MODEM_CTS     0x0100               /* CTS for the modem line (2) */
+#define DZ_PRINT_RI      0x0008               /* RI for the printer line (3) */
+#define DZ_PRINT_CD      0x0004               /* CD for the printer line (3) */
+#define DZ_PRINT_DSR     0x0002               /* DSR for the prntr line (3) */
+#define DZ_PRINT_CTS     0x0001               /* CTS for the prntr line (3) */
 
 /*
  * Definitions for the Transmit Data Register.