[src/netbsd-1-4]: src/sys/arch/x68k/dev pullup 1.3->1.4 (minoura): Use mvme68...

[perry <perry%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0c8eab2cf030
branches:  netbsd-1-4
changeset: 468952:0c8eab2cf030
user:      perry <perry%NetBSD.org@localhost>
date:      Thu Jun 24 15:49:19 1999 +0000

description:
pullup 1.3->1.4 (minoura): Use mvme68k-derived delay() routine

diffstat:

 sys/arch/x68k/dev/mfp.c |  37 ++++++++++++++++++++++++++++++++++---
 1 files changed, 34 insertions(+), 3 deletions(-)

diffs (70 lines):

diff -r 8d3d91a95c9c -r 0c8eab2cf030 sys/arch/x68k/dev/mfp.c
--- a/sys/arch/x68k/dev/mfp.c   Thu Jun 24 15:40:51 1999 +0000
+++ b/sys/arch/x68k/dev/mfp.c   Thu Jun 24 15:49:19 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mfp.c,v 1.3 1999/03/18 12:27:59 minoura Exp $  */
+/*     $NetBSD: mfp.c,v 1.3.2.1 1999/06/24 15:49:19 perry Exp $        */
 
 /*
  *
@@ -55,13 +55,12 @@
 static int mfp_match __P((struct device *, struct cfdata *, void *));
 static void mfp_attach __P((struct device *, struct device *, void *));
 static void mfp_init __P((void));
+static void mfp_calibrate_delay __P((void));
 
 struct cfattach mfp_ca = {
        sizeof(struct mfp_softc), mfp_match, mfp_attach
 };
 
-extern int x68k_realconfig;
-extern struct cfdriver mfp_cd;
 
 static int
 mfp_match(parent, cf, aux)
@@ -120,6 +119,12 @@
                config_found (self, "kbd", NULL);
                config_found (self, "clock", NULL);
                config_found (self, "pow", NULL);
+       } else {
+               /*
+                * Called from config_console;
+                * calibrate the DELAY loop counter
+                */
+               mfp_calibrate_delay();
        }
 }
 
@@ -144,6 +149,32 @@
        mfp_set_tcdcr(0);
 }
 
+extern int delay_divisor;
+void   _delay __P((u_int));
+
+static void
+mfp_calibrate_delay(void)
+{
+       /*
+        * Stolen from mvme68k.
+        */
+       /*
+        * X68k provides 4MHz clock (= 0.25usec) for MFP timer C.
+        * 10000usec = 0.25usec * 200 * 200
+        * Our slowest clock is 20MHz (?).  Its delay_divisor value
+        * should be about 102.  Start from 140 here.
+        */
+       for (delay_divisor = 140; delay_divisor > 0; delay_divisor--) {
+               mfp_set_tcdr(255-0);
+               mfp_set_tcdcr(0x70); /* 1/200 delay mode */
+               _delay(10000 << 8);
+               mfp_set_tcdcr(0); /* stop timer */
+               if ((255 - mfp_get_tcdr()) > 200)
+                       break;  /* got it! */
+               /* retry! */
+       }
+}
+
 /*
  * MFP utility functions
  */