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authorKumar Gala <galak@kernel.crashing.org>2007-12-07 04:59:26 -0600
committerKumar Gala <galak@kernel.crashing.org>2007-12-11 22:34:20 -0600
commitd435793229ce29a42797c1edc39f5b34f987f91a (patch)
treebe66e43419c21c827922d620431716444e6e50e0 /cpu/mpc85xx/speed.c
parent22abb2d2eaf7b795a6923c6273ec9cb53fda9a10 (diff)
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Handle Asynchronous DDR clock on 85xx
The MPC8572 introduces the concept of an asynchronous DDR clock with regards to the platform clock. Introduce get_ddr_freq() to report the DDR freq regardless of sync/async mode. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'cpu/mpc85xx/speed.c')
-rw-r--r--cpu/mpc85xx/speed.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/cpu/mpc85xx/speed.c b/cpu/mpc85xx/speed.c
index 293269c..27de37a 100644
--- a/cpu/mpc85xx/speed.c
+++ b/cpu/mpc85xx/speed.c
@@ -48,6 +48,15 @@ void get_sys_info (sys_info_t * sysInfo)
* overflow for processor speeds above 2GHz */
half_freqSystemBus = sysInfo->freqSystemBus/2;
sysInfo->freqProcessor = e500_ratio*half_freqSystemBus;
+ sysInfo->freqDDRBus = sysInfo->freqSystemBus;
+
+#ifdef CONFIG_DDR_CLK_FREQ
+ {
+ u32 ddr_ratio = ((gur->porpllsr) & 0x00003e00) >> 9;
+ if (ddr_ratio != 0x7)
+ sysInfo->freqDDRBus = ddr_ratio * CONFIG_DDR_CLK_FREQ;
+ }
+#endif
}
@@ -93,3 +102,19 @@ ulong get_bus_freq (ulong dummy)
return val;
}
+
+/********************************************
+ * get_ddr_freq
+ * return ddr bus freq in Hz
+ *********************************************/
+ulong get_ddr_freq (ulong dummy)
+{
+ ulong val;
+
+ sys_info_t sys_info;
+
+ get_sys_info (&sys_info);
+ val = sys_info.freqDDRBus;
+
+ return val;
+}