[src/trunk]: src/sys/dev/sdmmc support 8-bit mode for SDHC 3.0+ controllers

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

details:   https://anonhg.NetBSD.org/src/rev/f9792a1b7177
branches:  trunk
changeset: 338573:f9792a1b7177
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat May 30 17:52:07 2015 +0000

description:
support 8-bit mode for SDHC 3.0+ controllers

diffstat:

 sys/dev/sdmmc/sdhc.c |  12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diffs (34 lines):

diff -r 2bb4f1090ad7 -r f9792a1b7177 sys/dev/sdmmc/sdhc.c
--- a/sys/dev/sdmmc/sdhc.c      Sat May 30 17:39:56 2015 +0000
+++ b/sys/dev/sdmmc/sdhc.c      Sat May 30 17:52:07 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sdhc.c,v 1.58 2015/05/03 22:37:27 jmcneill Exp $       */
+/*     $NetBSD: sdhc.c,v 1.59 2015/05/30 17:52:07 jmcneill Exp $       */
 /*     $OpenBSD: sdhc.c,v 1.25 2009/01/13 19:44:20 grange Exp $        */
 
 /*
@@ -23,7 +23,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sdhc.c,v 1.58 2015/05/03 22:37:27 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sdhc.c,v 1.59 2015/05/30 17:52:07 jmcneill Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_sdmmc.h"
@@ -1029,8 +1029,14 @@
                        reg |= SDHC_ESDHC_8BIT_MODE;
        } else {
                reg &= ~SDHC_4BIT_MODE;
-               if (width == 4)
+               if (hp->specver >= SDHC_SPEC_VERS_300) {
+                       reg &= ~SDHC_8BIT_MODE;
+               }
+               if (width == 4) {
                        reg |= SDHC_4BIT_MODE;
+               } else if (width == 8 && hp->specver >= SDHC_SPEC_VERS_300) {
+                       reg |= SDHC_8BIT_MODE;
+               }
        }
        HWRITE1(hp, SDHC_HOST_CTL, reg);
        mutex_exit(&hp->host_mtx);