patch-2.2.18 linux/drivers/char/ser_hpdca.h

• Lines: 92
• Date: Sat Oct 14 00:04:25 2000
• Orig file: v2.2.17/drivers/char/ser_hpdca.h
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/char/ser_hpdca.h linux/drivers/char/ser_hpdca.h
@@ -0,0 +1,91 @@
+/*
+ * Defines for the 98626/98644/internal serial interface on hp300/hp400
+ * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
+ *
+ * This driver was written by Peter Maydell <pmaydell@chiark.greenend.org.uk>
+ * based on informaition gleaned from the NetBSD driver and the ser_ioext
+ * driver. Copyright(C) 05/1998.
+ *
+ * The driver is called hpdca because the NetBSD driver is 'dca' and 
+ * I wanted something less generic than hp300...
+ *
+ * The NetBSD driver works for hp700 as well. I don't have one so I
+ * took the easy route and dropped support. However, this might be a good
+ * place to start if you're adding it back in again...
+ *
+ *  N.B. On the hp700 and some hp300s, there is a "secret bit" with
+ *  undocumented behavior.  The third bit of the Modem Control Register
+ *  (MCR_IEN == 0x08) must be set to enable interrupts.  Failure to do
+ *  so can result in deadlock on those machines, whereas there don't seem to
+ *  be any harmful side-effects from setting this bit on non-affected
+ *  machines.
+ */
+
+#ifndef _SER_HPDCA_H_
+#define _SER_HPDCA_H_
+
+/* 16bit baud rate divisor (lower byte in dca_data, upper in dca_ier).
+ * NB:the hp300 constant is for a clk frequency of 2.4576
+ * ie HPDCA_BAUD_BASE = 2457600 / 16
+ */
+#define HPDCA_BAUD_BASE 153600
+#define DCABRD(x) (HPDCA_BAUD_BASE / (x))
+
+/* interface reset/id (300 only) */
+#define DCAID0          0x02
+#define DCAREMID0       0x82
+#define DCAID1          0x42
+#define DCAREMID1       0xC2
+
+/* interrupt control (300 only) */
+#define DCAIPL(x)       ((((x) >> 4) & 3) + 3)
+#define IC_IR           0x40
+#define IC_IE           0x80
+
+/* the 16c552 is two 16c550s and a parallel port, so its definitions  
+ * of various register bits are OK for us.
+ */
+#include <linux/16c552.h>
+
+/* This is what the register layout looks like: */
+typedef struct 
+{
+   /* card registers */
+   u_char gap0;
+   volatile u_char dca_id;    /* (read) */
+#define dca_reset dca_id  /* (write) */
+   u_char gap1;
+   volatile u_char dca_ic;                        /* interrupt control */
+   u_char gap2;
+   volatile u_char dca_ocbrc;
+   u_char gap3;
+   volatile u_char dca_lcsm;
+   u_char gap4[8];
+   /* chip registers */
+   struct uart_16c550 uart;
+} hpdca_struct;
+
+/* purely because the IOEXT code I'm copying uses 5 :-> */
+#define MAX_HPDCA 5
+
+typedef struct 
+{
+   volatile struct uart_16c550 *uart;
+   int hasfifo;                                   /* does this UART have a FIFO? */
+   hpdca_struct *board;
+   int scode;                                     /* select code of this board */
+   int spurious_count;
+   int line;
+} hpdcaInfoType;
+
+extern int hpdca_num;                             /* number of detected boards */
+extern hpdcaInfoType hpdca_info[MAX_HPDCA];
+
+#define curruart(info) ((struct uart_16c550 *)(info->port))
+
+#define ser_DTRon(info)  curruart(info)->MCR |=  DTR
+#define ser_RTSon(info)  curruart(info)->MCR |=  RTS
+#define ser_DTRoff(info) curruart(info)->MCR &= ~DTR
+#define ser_RTSoff(info) curruart(info)->MCR &= ~RTS
+
+#endif /* ndef _SER_HPDCA_H_ */