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Merge branch 'master' of git://www.denx.de/git/u-boot-at91

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This commit is contained in:
Wolfgang Denk 2008-04-25 10:05:42 +02:00
commit 04a5b03d86
1 changed files with 29 additions and 53 deletions
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82
cpu/arm926ejs/davinci/timer.c
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@ -42,9 +42,9 @@
typedef volatile struct { typedef volatile struct {
u_int32_t pid12; u_int32_t pid12;
u_int32_t emumgt_clksped; u_int32_t emumgt;
u_int32_t gpint_en; u_int32_t na1;
u_int32_t gpdir_dat; u_int32_t na2;
u_int32_t tim12; u_int32_t tim12;
u_int32_t tim34; u_int32_t tim34;
u_int32_t prd12; u_int32_t prd12;
@ -52,21 +52,12 @@ typedef volatile struct {
u_int32_t tcr; u_int32_t tcr;
u_int32_t tgcr; u_int32_t tgcr;
u_int32_t wdtcr; u_int32_t wdtcr;
u_int32_t tlgc;
u_int32_t tlmr;
} davinci_timer; } davinci_timer;
davinci_timer *timer = (davinci_timer *)CFG_TIMERBASE; davinci_timer *timer = (davinci_timer *)CFG_TIMERBASE;
#define TIMER_LOAD_VAL (CFG_HZ_CLOCK / CFG_HZ) #define TIMER_LOAD_VAL (CFG_HZ_CLOCK / CFG_HZ)
#define READ_TIMER timer->tim34 #define TIM_CLK_DIV 16
/*
* Timer runs with CFG_HZ_CLOCK, currently 27MHz. To avoid wrap
* around of timestamp already after min ~159s, divide it, e.g. by 16.
* timestamp will then wrap around all min ~42min
*/
#define DIV(x) ((x) >> 4)
static ulong timestamp; static ulong timestamp;
static ulong lastinc; static ulong lastinc;
@ -76,24 +67,43 @@ int timer_init(void)
/* We are using timer34 in unchained 32-bit mode, full speed */ /* We are using timer34 in unchained 32-bit mode, full speed */
timer->tcr = 0x0; timer->tcr = 0x0;
timer->tgcr = 0x0; timer->tgcr = 0x0;
timer->tgcr = 0x06; timer->tgcr = 0x06 | ((TIM_CLK_DIV - 1) << 8);
timer->tim34 = 0x0; timer->tim34 = 0x0;
timer->prd34 = TIMER_LOAD_VAL; timer->prd34 = TIMER_LOAD_VAL;
lastinc = 0; lastinc = 0;
timer->tcr = 0x80 << 16;
timestamp = 0; timestamp = 0;
timer->tcr = 2 << 22;
return(0); return(0);
} }
void reset_timer(void) void reset_timer(void)
{ {
reset_timer_masked(); timer->tcr = 0x0;
timer->tim34 = 0;
lastinc = 0;
timestamp = 0;
timer->tcr = 2 << 22;
}
static ulong get_timer_raw(void)
{
ulong now = timer->tim34;
if (now >= lastinc) {
/* normal mode */
timestamp += now - lastinc;
} else {
/* overflow ... */
timestamp += now + TIMER_LOAD_VAL - lastinc;
}
lastinc = now;
return timestamp;
} }
ulong get_timer(ulong base) ulong get_timer(ulong base)
{ {
return(get_timer_masked() - base); return((get_timer_raw() / (TIMER_LOAD_VAL / TIM_CLK_DIV)) - base);
} }
void set_timer(ulong t) void set_timer(ulong t)
@ -102,37 +112,6 @@ void set_timer(ulong t)
} }
void udelay(unsigned long usec) void udelay(unsigned long usec)
{
udelay_masked(usec);
}
void reset_timer_masked(void)
{
lastinc = DIV(READ_TIMER);
timestamp = 0;
}
ulong get_timer_raw(void)
{
ulong now = DIV(READ_TIMER);
if (now >= lastinc) {
/* normal mode */
timestamp += now - lastinc;
} else {
/* overflow ... */
timestamp += now + DIV(TIMER_LOAD_VAL) - lastinc;
}
lastinc = now;
return timestamp;
}
ulong get_timer_masked(void)
{
return(get_timer_raw() / DIV(TIMER_LOAD_VAL));
}
void udelay_masked(unsigned long usec)
{ {
ulong tmo; ulong tmo;
ulong endtime; ulong endtime;
@ -140,7 +119,7 @@ void udelay_masked(unsigned long usec)
tmo = CFG_HZ_CLOCK / 1000; tmo = CFG_HZ_CLOCK / 1000;
tmo *= usec; tmo *= usec;
tmo /= 1000; tmo /= (1000 * TIM_CLK_DIV);
endtime = get_timer_raw() + tmo; endtime = get_timer_raw() + tmo;
@ -165,8 +144,5 @@ unsigned long long get_ticks(void)
*/ */
ulong get_tbclk(void) ulong get_tbclk(void)
{ {
ulong tbclk; return CFG_HZ;
tbclk = CFG_HZ;
return(tbclk);
} }