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Reworked 85xx speed detection code 

Changed the code to read the registers and calculate the clock
rates, rather than using a "switch" statement.

Idea from Andrew Klossner <andrew@cesa.opbu.xerox.com>

Signed-off-by: Andy Fleming <afleming@freescale.com>
This commit is contained in:
Andy Fleming 2007-04-23 02:37:47 -05:00 committed by Andrew Fleming-AFLEMING
parent 81f481ca70
commit 66ed6cca3f
1 changed files with 8 additions and 36 deletions
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44
cpu/mpc85xx/speed.c
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@ -37,49 +37,21 @@ void get_sys_info (sys_info_t * sysInfo)
{ {
volatile immap_t *immap = (immap_t *)CFG_IMMR; volatile immap_t *immap = (immap_t *)CFG_IMMR;
volatile ccsr_gur_t *gur = &immap->im_gur; volatile ccsr_gur_t *gur = &immap->im_gur;
uint plat_ratio,e500_ratio; uint plat_ratio,e500_ratio,half_freqSystemBus;
plat_ratio = (gur->porpllsr) & 0x0000003e; plat_ratio = (gur->porpllsr) & 0x0000003e;
plat_ratio >>= 1; plat_ratio >>= 1;
switch(plat_ratio) { sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x08:
case 0x09:
case 0x0a:
case 0x0c:
case 0x10:
sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
break;
default:
sysInfo->freqSystemBus = 0;
break;
}
e500_ratio = (gur->porpllsr) & 0x003f0000; e500_ratio = (gur->porpllsr) & 0x003f0000;
e500_ratio >>= 16; e500_ratio >>= 16;
switch(e500_ratio) {
case 0x04: /* Divide before multiply to avoid integer
sysInfo->freqProcessor = 2*sysInfo->freqSystemBus; * overflow for processor speeds above 2GHz */
break; half_freqSystemBus = sysInfo->freqSystemBus/2;
case 0x05: sysInfo->freqProcessor = e500_ratio*half_freqSystemBus;
sysInfo->freqProcessor = 5*sysInfo->freqSystemBus/2;
break;
case 0x06:
sysInfo->freqProcessor = 3*sysInfo->freqSystemBus;
break;
case 0x07:
sysInfo->freqProcessor = 7*sysInfo->freqSystemBus/2;
break;
default:
sysInfo->freqProcessor = 0;
break;
}
} }
int get_clocks (void) int get_clocks (void)
{ {
sys_info_t sys_info; sys_info_t sys_info;