There are timers with a 64-bit counter value but current timer uclass driver assumes a 32-bit one. Introduce a device tree property "counter-64bit", and modify timer_get_count() in the timer uclass driver to handle the 32-bit/64-bit conversion automatically.
Signed-off-by: Bin Meng bmeng.cn@gmail.com
---
Changes in v2: - Do not use "counter-64bit" property, instead create an inline function for 32-bit timer driver to construct a 64-bit timer value.
drivers/timer/altera_timer.c | 4 ++-- drivers/timer/sandbox_timer.c | 2 +- drivers/timer/timer-uclass.c | 8 +++----- include/timer.h | 23 ++++++++++++++++++++--- lib/time.c | 9 ++++++--- 5 files changed, 32 insertions(+), 14 deletions(-)
diff --git a/drivers/timer/altera_timer.c b/drivers/timer/altera_timer.c index 6fe24f2..a7ed3cc 100644 --- a/drivers/timer/altera_timer.c +++ b/drivers/timer/altera_timer.c @@ -34,7 +34,7 @@ struct altera_timer_platdata { struct altera_timer_regs *regs; };
-static int altera_timer_get_count(struct udevice *dev, unsigned long *count) +static int altera_timer_get_count(struct udevice *dev, u64 *count) { struct altera_timer_platdata *plat = dev->platdata; struct altera_timer_regs *const regs = plat->regs; @@ -46,7 +46,7 @@ static int altera_timer_get_count(struct udevice *dev, unsigned long *count) /* Read timer value */ val = readl(®s->snapl) & 0xffff; val |= (readl(®s->snaph) & 0xffff) << 16; - *count = ~val; + *count = timer_conv_64(~val);
return 0; } diff --git a/drivers/timer/sandbox_timer.c b/drivers/timer/sandbox_timer.c index 4b20af2..00a9944 100644 --- a/drivers/timer/sandbox_timer.c +++ b/drivers/timer/sandbox_timer.c @@ -18,7 +18,7 @@ void sandbox_timer_add_offset(unsigned long offset) sandbox_timer_offset += offset; }
-static int sandbox_timer_get_count(struct udevice *dev, unsigned long *count) +static int sandbox_timer_get_count(struct udevice *dev, u64 *count) { *count = os_get_nsec() / 1000 + sandbox_timer_offset * 1000;
diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c index 0218591..1ef0012 100644 --- a/drivers/timer/timer-uclass.c +++ b/drivers/timer/timer-uclass.c @@ -9,18 +9,16 @@ #include <errno.h> #include <timer.h>
-DECLARE_GLOBAL_DATA_PTR; - /* * Implement a timer uclass to work with lib/time.c. The timer is usually - * a 32 bits free-running up counter. The get_rate() method is used to get + * a 32/64 bits free-running up counter. The get_rate() method is used to get * the input clock frequency of the timer. The get_count() method is used - * to get the current 32 bits count value. If the hardware is counting down, + * to get the current 64 bits count value. If the hardware is counting down, * the value should be inversed inside the method. There may be no real * tick, and no timer interrupt. */
-int timer_get_count(struct udevice *dev, unsigned long *count) +int timer_get_count(struct udevice *dev, u64 *count) { const struct timer_ops *ops = device_get_ops(dev);
diff --git a/include/timer.h b/include/timer.h index ed5c685..4eed504 100644 --- a/include/timer.h +++ b/include/timer.h @@ -7,6 +7,23 @@ #ifndef _TIMER_H_ #define _TIMER_H_
+DECLARE_GLOBAL_DATA_PTR; + +/* + * timer_conv_64 - convert 32-bit counter value to 64-bit + * + * @count: 32-bit counter value + * @return: 64-bit counter value + */ +static inline u64 timer_conv_64(u32 count) +{ + /* increment tbh if tbl has rolled over */ + if (count < gd->timebase_l) + gd->timebase_h++; + gd->timebase_l = count; + return ((u64)gd->timebase_h << 32) | gd->timebase_l; +} + /* * Get the current timer count * @@ -14,7 +31,7 @@ * @count: pointer that returns the current timer count * @return: 0 if OK, -ve on error */ -int timer_get_count(struct udevice *dev, unsigned long *count); +int timer_get_count(struct udevice *dev, u64 *count);
/* * Get the timer input clock frequency @@ -35,10 +52,10 @@ struct timer_ops { * Get the current timer count * * @dev: The timer device - * @count: pointer that returns the current timer count + * @count: pointer that returns the current 64-bit timer count * @return: 0 if OK, -ve on error */ - int (*get_count)(struct udevice *dev, unsigned long *count); + int (*get_count)(struct udevice *dev, u64 *count); };
/* diff --git a/lib/time.c b/lib/time.c index b001745..f37a662 100644 --- a/lib/time.c +++ b/lib/time.c @@ -69,9 +69,9 @@ ulong notrace get_tbclk(void) return timer_get_rate(gd->timer); }
-unsigned long notrace timer_read_counter(void) +uint64_t notrace get_ticks(void) { - unsigned long count; + u64 count; int ret;
ret = dm_timer_init(); @@ -84,7 +84,8 @@ unsigned long notrace timer_read_counter(void)
return count; } -#endif /* CONFIG_TIMER */ + +#else /* !CONFIG_TIMER */
uint64_t __weak notrace get_ticks(void) { @@ -97,6 +98,8 @@ uint64_t __weak notrace get_ticks(void) return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l; }
+#endif /* CONFIG_TIMER */ + /* Returns time in milliseconds */ static uint64_t notrace tick_to_time(uint64_t tick) {