[src/trunk]: src/sys/arch/arm/imx Support imxuart_freq=0 (use existing settings)

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

details:   https://anonhg.NetBSD.org/src/rev/7c5839cc37fa
branches:  trunk
changeset: 968304:7c5839cc37fa
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Jan 12 00:35:11 2020 +0000

description:
Support imxuart_freq=0 (use existing settings)

diffstat:

 sys/arch/arm/imx/imxuart.c |  44 +++++++++++++++++++++++++-------------------
 1 files changed, 25 insertions(+), 19 deletions(-)

diffs (72 lines):

diff -r 034d7085ad98 -r 7c5839cc37fa sys/arch/arm/imx/imxuart.c
--- a/sys/arch/arm/imx/imxuart.c        Sat Jan 11 22:21:25 2020 +0000
+++ b/sys/arch/arm/imx/imxuart.c        Sun Jan 12 00:35:11 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: imxuart.c,v 1.22 2019/11/10 21:16:23 chs Exp $ */
+/* $NetBSD: imxuart.c,v 1.23 2020/01/12 00:35:11 jmcneill Exp $ */
 
 /*
  * Copyright (c) 2009, 2010  Genetec Corporation.  All rights reserved.
@@ -96,7 +96,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: imxuart.c,v 1.22 2019/11/10 21:16:23 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: imxuart.c,v 1.23 2020/01/12 00:35:11 jmcneill Exp $");
 
 #include "opt_imxuart.h"
 #include "opt_ddb.h"
@@ -2186,30 +2186,36 @@
             IMX_UART_SIZE, 0, &regsp->ur_ioh)) != 0)
                return error;
 
-       if (imxuspeed(rate, &ratio) < 0)
-               return EINVAL;
-
-       /* UBIR must updated before UBMR */
-       bus_space_write_4(regsp->ur_iot, regsp->ur_ioh,
-           IMX_UBIR, ratio.numerator);
-       bus_space_write_4(regsp->ur_iot, regsp->ur_ioh,
-           IMX_UBMR, ratio.modulator);
-
+       if (imxuart_freq != 0) {
+               if (imxuspeed(rate, &ratio) < 0)
+                       return EINVAL;
+
+               /* UBIR must updated before UBMR */
+               bus_space_write_4(regsp->ur_iot, regsp->ur_ioh,
+                   IMX_UBIR, ratio.numerator);
+               bus_space_write_4(regsp->ur_iot, regsp->ur_ioh,
+                   IMX_UBMR, ratio.modulator);
+       }
 
        /* XXX: DTREN, DPEC */
        bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR3,
            IMX_UCR3_DSR|IMX_UCR3_RXDMUXSEL);
 
-       ufcr = (8 << IMX_UFCR_TXTL_SHIFT) | (rfdiv << IMX_UFCR_RFDIV_SHIFT) |
-               (1 << IMX_UFCR_RXTL_SHIFT);
-       /* XXX: keep DCE/DTE bit */
-       ufcr |= bus_space_read_4(regsp->ur_iot, regsp->ur_ioh, IMX_UFCR) &
-               IMX_UFCR_DCEDTE;
-
+       ufcr = bus_space_read_4(regsp->ur_iot, regsp->ur_ioh, IMX_UFCR);
+       ufcr &= ~IMX_UFCR_TXTL;
+       ufcr |= (8 << IMX_UFCR_TXTL_SHIFT);
+       ufcr &= ~IMX_UFCR_RXTL;
+       ufcr |= (1 << IMX_UFCR_RXTL_SHIFT);
+       if (imxuart_freq != 0) {
+               ufcr &= ~IMX_UFCR_RFDIV;
+               ufcr |= (rfdiv << IMX_UFCR_RFDIV_SHIFT);
+       }
        bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UFCR, ufcr);
 
-       bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_ONEMS,
-           imxuart_freq / imxuart_freqdiv / 1000);
+       if (imxuart_freq != 0) {
+               bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_ONEMS,
+                   imxuart_freq / imxuart_freqdiv / 1000);
+       }
 
        bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR2,
                          IMX_UCR2_IRTS|