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85xx: Speed up get_ddr_freq() and get_bus_freq()

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get_ddr_freq() and get_bus_freq() used get_sys_info() each time they were
called.  However, get_sys_info() recalculates extraneous information when
called each time.  Have get_ddr_freq() and get_bus_freq() return memoized
values from global_data instead.

Signed-off-by: James Yang <James.Yang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
James Yang 2008-02-08 18:05:08 -06:00 committed by Andrew Fleming-AFLEMING
parent e9ea679918
commit a3e77fa535
2 changed files with 5 additions and 18 deletions
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21
cpu/mpc85xx/speed.c
View File

@ -48,6 +48,8 @@ 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;
/* Note: freqDDRBus is the MCLK frequency, not the data rate. */
sysInfo->freqDDRBus = sysInfo->freqSystemBus;
#ifdef CONFIG_DDR_CLK_FREQ
@ -75,6 +77,7 @@ int get_clocks (void)
get_sys_info (&sys_info);
gd->cpu_clk = sys_info.freqProcessor;
gd->bus_clk = sys_info.freqSystemBus;
gd->mem_clk = sys_info.freqDDRBus;
gd->i2c1_clk = sys_info.freqSystemBus;
gd->i2c2_clk = sys_info.freqSystemBus;
@ -96,14 +99,7 @@ int get_clocks (void)
*********************************************/
ulong get_bus_freq (ulong dummy)
{
ulong val;
sys_info_t sys_info;
get_sys_info (&sys_info);
val = sys_info.freqSystemBus;
return val;
return gd->bus_clk;
}
/********************************************
@ -112,12 +108,5 @@ ulong get_bus_freq (ulong dummy)
*********************************************/
ulong get_ddr_freq (ulong dummy)
{
ulong val;
sys_info_t sys_info;
get_sys_info (&sys_info);
val = sys_info.freqDDRBus;
return val;
return gd->mem_clk;
}

2
include/asm-ppc/global_data.h
View File

@ -52,9 +52,7 @@ typedef struct global_data {
unsigned long scc_clk;
unsigned long brg_clk;
#endif
#if defined(CONFIG_MPC7448HPC2)
unsigned long mem_clk;
#endif
#if defined(CONFIG_MPC83XX)
/* There are other clocks in the MPC83XX */
u32 csb_clk;