[src/trunk]: src/sys/arch/arm/samsung Calculate UART frequency based on bootl...

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

details:   https://anonhg.NetBSD.org/src/rev/c32a2fd58ac9
branches:  trunk
changeset: 354294:c32a2fd58ac9
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jun 10 23:23:05 2017 +0000

description:
Calculate UART frequency based on bootloader config.

diffstat:

 sys/arch/arm/samsung/exynos_sscom.c |  13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diffs (34 lines):

diff -r cb7453d38dad -r c32a2fd58ac9 sys/arch/arm/samsung/exynos_sscom.c
--- a/sys/arch/arm/samsung/exynos_sscom.c       Sat Jun 10 23:22:36 2017 +0000
+++ b/sys/arch/arm/samsung/exynos_sscom.c       Sat Jun 10 23:23:05 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: exynos_sscom.c,v 1.8 2017/06/10 15:13:18 jmcneill Exp $ */
+/*     $NetBSD: exynos_sscom.c,v 1.9 2017/06/10 23:23:05 jmcneill Exp $ */
 
 /*
  * Copyright (c) 2014 Reinoud Zandijk
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: exynos_sscom.c,v 1.8 2017/06/10 15:13:18 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: exynos_sscom.c,v 1.9 2017/06/10 23:23:05 jmcneill Exp $");
 
 #include "opt_sscom.h"
 #include "opt_ddb.h"
@@ -262,7 +262,14 @@
        if (bus_space_map(bst, addr, size, 0, &bsh) != 0)
                panic("cannot map console UART");
 
-       if (sscom_cnattach(bst, bsh, &info, speed, uart_freq, flags) != 0)
+       /* Calculate UART frequency from bootloader (XXX) */
+       uint32_t freq = speed
+           * (16 * (bus_space_read_4(bst, bsh, SSCOM_UBRDIV) + 1)
+                 + bus_space_read_4(bst, bsh, SSCOM_UFRACVAL));
+       freq = (freq + speed / 2) / 1000;
+       freq *= 1000;
+
+       if (sscom_cnattach(bst, bsh, &info, speed, freq, flags) != 0)
                panic("cannot attach console UART");
 }