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authorDaniel Gorsulowski <Daniel.Gorsulowski@esd.eu>2010-01-20 08:00:11 +0100
committerTom Rix <Tom.Rix@windriver.com>2010-01-23 08:15:50 -0600
commita3f3897bfda9b4729785bdd328b3b7f30417a67f (patch)
treeded9dced10adeea568982bf634b9dc7d3c00f537 /board
parent7da692360414d07027c6cf564a15d79cd9dcf488 (diff)
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at91: Enable slow master clock on meesc board
Normally the processor clock has a divisor of 2. In some cases this this needs to be set to 4. Check the user has set environment mdiv to 4 to change the divisor. Signed-off-by: Daniel Gorsulowski <Daniel.Gorsulowski@esd.eu>
Diffstat (limited to 'board')
-rw-r--r--board/esd/meesc/meesc.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/board/esd/meesc/meesc.c b/board/esd/meesc/meesc.c
index efba60d..a1b66cb 100644
--- a/board/esd/meesc/meesc.c
+++ b/board/esd/meesc/meesc.c
@@ -219,6 +219,32 @@ u32 get_board_rev(void)
}
#endif
+#ifdef CONFIG_MISC_INIT_R
+int misc_init_r(void)
+{
+ char *str;
+ char buf[32];
+
+ /*
+ * Normally the processor clock has a divisor of 2.
+ * In some cases this this needs to be set to 4.
+ * Check the user has set environment mdiv to 4 to change the divisor.
+ */
+ if ((str = getenv("mdiv")) && (strcmp(str, "4") == 0)) {
+ at91_sys_write(AT91_PMC_MCKR,
+ (at91_sys_read(AT91_PMC_MCKR) & ~AT91_PMC_MDIV) |
+ AT91SAM9_PMC_MDIV_4);
+ at91_clock_init(0);
+ serial_setbrg();
+ /* Notify the user that the clock is not default */
+ printf("Setting master clock to %s MHz\n",
+ strmhz(buf, get_mck_clk_rate()));
+ }
+
+ return 0;
+}
+#endif /* CONFIG_MISC_INIT_R */
+
int board_init(void)
{
/* Peripheral Clock Enable Register */