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Introduce common timer functions
Many platforms duplicate pretty much the same timer code yet they all have a 32-bit freerunning counter register. Create a common implementation that minimally requires 2 or 3 defines to add timer support: CONFIG_SYS_TIMER_RATE - Clock rate of the timer counter CONFIG_SYS_TIMER_COUNTER - Address of 32-bit counter CONFIG_SYS_TIMER_COUNTS_DOWN - Define if counter counts down All functions are weak or ifdef'ed so they can still be overriden by any platform. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
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2 changed files with 75 additions and 0 deletions
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@ -72,6 +72,8 @@ typedef struct global_data {
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#if defined(CONFIG_SYS_I2C)
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#if defined(CONFIG_SYS_I2C)
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int cur_i2c_bus; /* current used i2c bus */
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int cur_i2c_bus; /* current used i2c bus */
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#endif
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#endif
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unsigned long timebase_h;
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unsigned long timebase_l;
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struct arch_global_data arch; /* architecture-specific data */
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struct arch_global_data arch; /* architecture-specific data */
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} gd_t;
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} gd_t;
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#endif
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#endif
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73
lib/time.c
73
lib/time.c
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@ -7,6 +7,8 @@
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#include <common.h>
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#include <common.h>
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#include <watchdog.h>
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#include <watchdog.h>
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#include <div64.h>
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#include <asm/io.h>
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#if CONFIG_SYS_HZ != 1000
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#if CONFIG_SYS_HZ != 1000
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#warning "CONFIG_SYS_HZ must be 1000 and should not be defined by platforms"
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#warning "CONFIG_SYS_HZ must be 1000 and should not be defined by platforms"
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@ -16,6 +18,77 @@
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# define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default*/
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# define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default*/
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#endif
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_SYS_TIMER_RATE
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ulong notrace get_tbclk(void)
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{
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return CONFIG_SYS_TIMER_RATE;
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}
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#endif
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#ifdef CONFIG_SYS_TIMER_COUNTER
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unsigned long notrace timer_read_counter(void)
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{
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#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
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return ~readl(CONFIG_SYS_TIMER_COUNTER);
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#else
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return readl(CONFIG_SYS_TIMER_COUNTER);
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#endif
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}
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#else
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extern unsigned long timer_read_counter(void);
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#endif
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unsigned long long __weak notrace get_ticks(void)
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{
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unsigned long now = timer_read_counter();
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/* increment tbu if tbl has rolled over */
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if (now < gd->timebase_l)
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gd->timebase_h++;
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gd->timebase_l = now;
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return ((unsigned long long)gd->timebase_h << 32) | gd->timebase_l;
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}
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static unsigned long long notrace tick_to_time(unsigned long long tick)
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{
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unsigned int div = get_tbclk();
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tick *= CONFIG_SYS_HZ;
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do_div(tick, div);
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return tick;
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}
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ulong __weak get_timer(ulong base)
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{
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return tick_to_time(get_ticks()) - base;
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}
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unsigned long __weak notrace timer_get_us(void)
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{
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return tick_to_time(get_ticks() * 1000);
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}
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static unsigned long long usec_to_tick(unsigned long usec)
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{
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unsigned long long tick = usec * get_tbclk();
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usec *= get_tbclk();
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do_div(tick, 1000000);
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return tick;
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}
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void __weak __udelay(unsigned long usec)
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{
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unsigned long long tmp;
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ulong tmo;
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tmo = usec_to_tick(usec);
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tmp = get_ticks() + tmo; /* get current timestamp */
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while (get_ticks() < tmp) /* loop till event */
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/*NOP*/;
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}
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/* ------------------------------------------------------------------------- */
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/* ------------------------------------------------------------------------- */
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void udelay(unsigned long usec)
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void udelay(unsigned long usec)
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