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rockchip: timer: implement timer_get_boot_us

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To make the Rockchip DM timer driver useful for the timing of
bootstages, we need a few enhancements:
 - This implements timer_get_boot_us.
 - This avoids reinitialising the timer, if it has already been
   set up (e.g. by our TPL and SPL stages). Now, we have a single
   timebase ticking from TPL through the full U-Boot.
 - This adds support for reading the timer even before the
   device-model is ready: we find the timer via /chosen/tick-timer,
   then read its address and clock-frequency, and finally read the
   timeval directly).

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich 2017-09-11 22:04:16 +02:00
parent be5f04e850
commit cc7ce94e02
1 changed files with 67 additions and 5 deletions
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72
drivers/timer/rockchip_timer.c
View file

@ -6,6 +6,7 @@
#include <common.h>
#include <dm.h>
#include <dm/ofnode.h>
#include <mapmem.h>
#include <asm/arch/timer.h>
#include <dt-structs.h>
@ -25,17 +26,72 @@ struct rockchip_timer_priv {
struct rk_timer *timer;
};
static int rockchip_timer_get_count(struct udevice *dev, u64 *count)
static inline int64_t rockchip_timer_get_curr_value(struct rk_timer *timer)
{
struct rockchip_timer_priv *priv = dev_get_priv(dev);
uint64_t timebase_h, timebase_l;
uint64_t cntr;
timebase_l = readl(&priv->timer->timer_curr_value0);
timebase_h = readl(&priv->timer->timer_curr_value1);
timebase_l = readl(&timer->timer_curr_value0);
timebase_h = readl(&timer->timer_curr_value1);
cntr = timebase_h << 32 | timebase_l;
return cntr;
}
#if CONFIG_IS_ENABLED(BOOTSTAGE)
ulong timer_get_boot_us(void)
{
uint64_t ticks = 0;
uint32_t rate;
uint64_t us;
int ret;
ret = dm_timer_init();
if (!ret) {
/* The timer is available */
rate = timer_get_rate(gd->timer);
timer_get_count(gd->timer, &ticks);
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
} else if (ret == -EAGAIN) {
/* We have been called so early that the DM is not ready,... */
ofnode node = offset_to_ofnode(-1);
struct rk_timer *timer = NULL;
/*
* ... so we try to access the raw timer, if it is specified
* via the tick-timer property in /chosen.
*/
node = ofnode_get_chosen_node("tick-timer");
if (!ofnode_valid(node)) {
debug("%s: no /chosen/tick-timer\n", __func__);
return 0;
}
timer = (struct rk_timer *)ofnode_get_addr(node);
/* This timer is down-counting */
ticks = ~0uLL - rockchip_timer_get_curr_value(timer);
if (ofnode_read_u32(node, "clock-frequency", &rate)) {
debug("%s: could not read clock-frequency\n", __func__);
return 0;
}
#endif
} else {
return 0;
}
us = (ticks * 1000) / rate;
return us;
}
#endif
static int rockchip_timer_get_count(struct udevice *dev, u64 *count)
{
struct rockchip_timer_priv *priv = dev_get_priv(dev);
uint64_t cntr = rockchip_timer_get_curr_value(priv->timer);
/* timers are down-counting */
cntr = timebase_h << 32 | timebase_l;
*count = ~0ull - cntr;
return 0;
}
@ -58,6 +114,12 @@ static int rockchip_timer_start(struct udevice *dev)
const uint32_t reload_val_l = reload_val & 0xffffffff;
const uint32_t reload_val_h = reload_val >> 32;
/* don't reinit, if the timer is already running and set up */
if ((readl(&priv->timer->timer_ctrl_reg) & 1) == 1 &&
(readl(&priv->timer->timer_load_count0) == reload_val_l) &&
(readl(&priv->timer->timer_load_count1) == reload_val_h))
return 0;
/* disable timer and reset all control */
writel(0, &priv->timer->timer_ctrl_reg);
/* write reload value */