[src/trunk]: src/sys/dev/ic Fix TX FIFO on Tegra

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

details:   https://anonhg.NetBSD.org/src/rev/9a9a75de8f51
branches:  trunk
changeset: 342290:9a9a75de8f51
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Mon Dec 14 23:57:30 2015 +0000

description:
Fix TX FIFO on Tegra

diffstat:

 sys/dev/ic/com.c |  21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

diffs (57 lines):

diff -r a1a0839f15ba -r 9a9a75de8f51 sys/dev/ic/com.c
--- a/sys/dev/ic/com.c  Mon Dec 14 23:21:23 2015 +0000
+++ b/sys/dev/ic/com.c  Mon Dec 14 23:57:30 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: com.c,v 1.337 2015/11/02 17:45:13 christos Exp $ */
+/* $NetBSD: com.c,v 1.338 2015/12/14 23:57:30 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999, 2004, 2008 The NetBSD Foundation, Inc.
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.337 2015/11/02 17:45:13 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.338 2015/12/14 23:57:30 jmcneill Exp $");
 
 #include "opt_com.h"
 #include "opt_ddb.h"
@@ -467,6 +467,14 @@
                SET(sc->sc_hwflags, COM_HW_FIFO);
                SET(sc->sc_hwflags, COM_HW_NOIEN);
                goto fifodelay;
+
+       case COM_TYPE_TEGRA:
+               sc->sc_fifolen = 8;
+               fifo_msg = "Tegra UART, working fifo";
+               SET(sc->sc_hwflags, COM_HW_FIFO);
+               CSR_WRITE_1(regsp, COM_REG_FIFO,
+                   FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
+               goto fifodelay;
        }
 
        sc->sc_fifolen = 1;
@@ -1468,17 +1476,20 @@
         *    overflows.
         *  * Otherwise set it a bit higher.
         */
-       if (sc->sc_type == COM_TYPE_HAYESP)
+       if (sc->sc_type == COM_TYPE_HAYESP) {
                sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8;
-       else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
+       } else if (sc->sc_type == COM_TYPE_TEGRA) {
+               sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_1;
+       } else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
                if (t->c_ospeed <= 1200)
                        sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_1;
                else if (t->c_ospeed <= 38400)
                        sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_8;
                else
                        sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_4;
-       } else
+       } else {
                sc->sc_fifo = 0;
+       }
 
        if (sc->sc_type == COM_TYPE_INGENIC)
                sc->sc_fifo |= FIFO_UART_ON;