[src/trunk]: src/sys/dev/pci Implement auixp AC-link reset

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

details:   https://anonhg.NetBSD.org/src/rev/b864a0fe0771
branches:  trunk
changeset: 581958:b864a0fe0771
user:      reinoud <reinoud%NetBSD.org@localhost>
date:      Sun Jun 12 00:02:18 2005 +0000

description:
Implement auixp AC-link reset

diffstat:

 sys/dev/pci/auixp.c |  71 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 67 insertions(+), 4 deletions(-)

diffs (100 lines):

diff -r c6ad2c3f1bc5 -r b864a0fe0771 sys/dev/pci/auixp.c
--- a/sys/dev/pci/auixp.c       Sat Jun 11 23:46:57 2005 +0000
+++ b/sys/dev/pci/auixp.c       Sun Jun 12 00:02:18 2005 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: auixp.c,v 1.6 2005/05/30 04:35:22 christos Exp $ */
+/* $NetBSD: auixp.c,v 1.7 2005/06/12 00:02:18 reinoud Exp $ */
 
 /*
  * Copyright (c) 2004, 2005 Reinoud Zandijk <reinoud%netbsd.org@localhost>
@@ -50,7 +50,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: auixp.c,v 1.6 2005/05/30 04:35:22 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: auixp.c,v 1.7 2005/06/12 00:02:18 reinoud Exp $");
 
 #include <sys/types.h>
 #include <sys/errno.h>
@@ -323,6 +323,7 @@
        value  =  bus_space_read_4(iot, ioh, ATI_REG_OUT_DMA_SLOT);
        value &= ~ATI_REG_OUT_DMA_SLOT_MASK;
 
+       /* TODO SPDIF case for 8 channels */
        switch (params->channels) {
        case 6:
                value |= ATI_REG_OUT_DMA_SLOT_BIT(7) |
@@ -1649,9 +1650,71 @@
 void
 auixp_reset_aclink(struct auixp_softc *sc)
 {
+       bus_space_tag_t      iot;
+       bus_space_handle_t   ioh;
+       uint32_t value, timeout;
 
-       /* XXX fix me! XXX */
-       printf("%s: could reset aclink\n", sc->sc_dev.dv_xname);
+       iot = sc->sc_iot;
+       ioh = sc->sc_ioh;
+
+       printf("%s: resetting aclink\n", sc->sc_dev.dv_xname);
+
+       /* powerdown reset */
+       value = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+       if (value & ATI_REG_CMD_POWERDOWN) {
+               /* if set explicitly powerdown it */
+               value &= ~ATI_REG_CMD_POWERDOWN;
+               bus_space_write_4(iot, ioh, ATI_REG_CMD, value);
+
+               /* have to wait aprox. 10 usec for it to initialise */
+               DELAY(10);
+       };
+
+       /* perform a software reset */
+       value  = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+       value |= ATI_REG_CMD_AC_SOFT_RESET;
+       bus_space_write_4(iot, ioh, ATI_REG_CMD, value);
+
+       /* need to read the CMD reg and wait aprox. 10 usec to init */
+       value  = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+       DELAY(10);
+
+       /* clear software reset flag */
+       value  = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+       value &= ~ATI_REG_CMD_AC_SOFT_RESET;
+       bus_space_write_4(iot, ioh, ATI_REG_CMD, value);
+
+       /* check if the ac-link is working, and reset device otherwise */
+       timeout = 10;
+       value = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+       while (!(value & ATI_REG_CMD_ACLINK_ACTIVE)) {
+               /* dip ac reset but keep the ac sync */
+               value &= ~ATI_REG_CMD_AC_RESET;
+               value |=  ATI_REG_CMD_AC_SYNC;
+               bus_space_write_4(iot, ioh, ATI_REG_CMD, value);
+
+               /* need to read again (clocking in issue?) */
+               value = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+               DELAY(10);
+
+               /* assert ac reset again */
+               value = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+               value |=  ATI_REG_CMD_AC_RESET;
+               bus_space_write_4(iot, ioh, ATI_REG_CMD, value);
+
+               if (--timeout) {
+                       printf("%s: codec reset timed out\n",
+                               sc->sc_dev.dv_xname);
+               };
+
+               /* check if its active again */
+               value = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+       };
+
+       /* assert reset and sync for safety */
+       value  = bus_space_read_4(iot, ioh, ATI_REG_CMD);
+       value |= ATI_REG_CMD_AC_SYNC | ATI_REG_CMD_AC_RESET;
+       bus_space_write_4(iot, ioh, ATI_REG_CMD, value);
 }