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Determine Pphi dynamically

This commit is contained in:
Lephenixnoir 2021-09-19 00:11:49 +02:00
parent 97b31a97d1
commit eef7d514c4
Signed by: Lephenixnoir
GPG Key ID: 1BBA026E13FC0495
1 changed files with 18 additions and 3 deletions
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21
src-cg/libprof.c
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@ -1,13 +1,30 @@
#include "libprof.h"
#define CPG_FRQCRA (*(volatile uint32_t *)0xa4150000)
#define CPG_FLLFRQ (*(volatile uint32_t *)0xa4150050)
#define CPG_PLLCR (*(volatile uint32_t *)0xa4150024)
/* Current frequency of Pphi */
static int Pphi;
/* prof_init(): Initialize the profiler's timer */
int prof_init(void)
{
*TMU0_TCOR = 0xffffffff;
*TMU0_TCNT = 0xffffffff;
*TMU0_TCR = 0x0000; /* UNIE=0 Pphi/4 */
*TMU_TSTR |= 1;
/* Determine the Pphi frequency based on the CPG configuration */
int pll = CPG_PLLCR & 0x4000 /* if PLLE: STC+1 */
? ((CPG_FRQCRA & 0x3f000000) >> 24) + 1
: 1;
int fll = CPG_PLLCR & 0x1000 /* if FLLE: FLF >> (SELXM != 0) */
? (CPG_FLLFRQ & 0x07ff) >> ((CPG_FLLFRQ & 0xc000) != 0)
: 1;
/* Shift by P1FC+1 places */
Pphi = (32768 * fll * pll) >> ((CPG_FRQCRA & 0x0000000f) + 1);
return 0;
}
@ -20,7 +37,5 @@ void prof_quit(void)
/* prof_time(): Time spent in a given context, in microseconds */
uint32_t prof_time(prof_t prof)
{
/* Hardcoded for the default overclock settings */
int Pphi = 29491200;
return ((uint64_t)prof.elapsed * 4 * 1000000) / Pphi;
}