[src/trunk]: src/sys/arch/macppc/dev if we get garbage from the RTC try again...

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

details:   https://anonhg.NetBSD.org/src/rev/0fa4dd5f0078
branches:  trunk
changeset: 801654:0fa4dd5f0078
user:      macallan <macallan%NetBSD.org@localhost>
date:      Wed Aug 13 10:56:35 2014 +0000

description:
if we get garbage from the RTC try again a couple times
this seems to happen more frequently when the PRAM battery goes bad

diffstat:

 sys/arch/macppc/dev/cuda.c |  43 ++++++++++++++++++++++++++++++-------------
 1 files changed, 30 insertions(+), 13 deletions(-)

diffs (109 lines):

diff -r 6303820b6dbc -r 0fa4dd5f0078 sys/arch/macppc/dev/cuda.c
--- a/sys/arch/macppc/dev/cuda.c        Wed Aug 13 09:41:50 2014 +0000
+++ b/sys/arch/macppc/dev/cuda.c        Wed Aug 13 10:56:35 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cuda.c,v 1.19 2014/03/14 21:59:41 mrg Exp $ */
+/*     $NetBSD: cuda.c,v 1.20 2014/08/13 10:56:35 macallan Exp $ */
 
 /*-
  * Copyright (c) 2006 Michael Lorenz
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cuda.c,v 1.19 2014/03/14 21:59:41 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cuda.c,v 1.20 2014/08/13 10:56:35 macallan Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -559,8 +559,8 @@
                if (sc->sc_received > 255) {
                        /* bitch only once */
                        if (sc->sc_received == 256) {
-                               printf("%s: input overflow\n",
-                                   device_xname(sc->sc_dev));
+                               aprint_error_dev(sc->sc_dev,
+                                   "input overflow\n");
                                ending = 1;
                        }
                } else
@@ -596,7 +596,8 @@
                                        me->handler(me->cookie,
                                            sc->sc_received - 1, &sc->sc_in[1]);
                                } else {
-                                       printf("no handler for type %02x\n", type);
+                                       aprint_error_dev(sc->sc_dev,
+                                         "no handler for type %02x\n", type);
                                        panic("barf");
                                }
                        }
@@ -678,6 +679,7 @@
                } else {
                        /* send next byte */
                        cuda_write_reg(sc, vSR, sc->sc_out[sc->sc_sent]);
+                       DPRINTF("%02x", sc->sc_out[sc->sc_sent]);
                        cuda_toggle_ack(sc);    /* signal byte ready to
                                                         * shift */
                }
@@ -755,16 +757,28 @@
        uint8_t cmd[] = { CUDA_PSEUDO, CMD_READ_RTC};
 
        sc->sc_tod = 0;
-       cuda_send(sc, 0, 2, cmd);
+       while (sc->sc_tod == 0) {
+               cuda_send(sc, 0, 2, cmd);
+
+               while ((sc->sc_tod == 0) && (cnt < 10)) {
+                       tsleep(&sc->sc_todev, 0, "todr", 10);
+                       cnt++;
+               }
 
-       while ((sc->sc_tod == 0) && (cnt < 10)) {
-               tsleep(&sc->sc_todev, 0, "todr", 10);
-               cnt++;
+               if (sc->sc_tod == 0) {
+                       aprint_error_dev(sc->sc_dev,
+                           "unable to read a sane RTC value\n");
+                       return EIO;
+               }
+               if ((sc->sc_tod > 0xf0000000UL) ||
+                   (sc->sc_tod < DIFF19041970)) {
+                       /* huh? try again */
+                       sc->sc_tod = 0;
+                       aprint_verbose_dev(sc->sc_dev,
+                           "got garbage reading RTC, trying again\n");
+               }
        }
 
-       if (sc->sc_tod == 0)
-               return EIO;
-
        tvp->tv_sec = sc->sc_tod - DIFF19041970;
        DPRINTF("tod: %" PRIo64 "\n", tvp->tv_sec);
        tvp->tv_usec = 0;
@@ -787,6 +801,7 @@
                }
                return 0;
        }
+       aprint_error_dev(sc->sc_dev, "%s failed\n", __func__);
        return -1;
                
 }
@@ -950,6 +965,7 @@
 
        if (sc->sc_error) {
                sc->sc_error = 0;
+               aprint_error_dev(sc->sc_dev, "error doing I2C\n");
                return -1;
        }
 
@@ -974,7 +990,8 @@
                }
 
                if (sc->sc_error) {
-                       printf("error trying to read\n");
+                       aprint_error_dev(sc->sc_dev, 
+                           "error trying to read from I2C\n");
                        sc->sc_error = 0;
                        return -1;
                }