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dm: x86: Allow TSC timer to be used before DM is ready

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With bootstage we need access to the timer before driver model is set up.
To handle this, put the required state in global_data and provide a new
function to set up the device, separate from the driver's probe() method.

This will be used by the 'early' timer also.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2017-09-05 19:49:46 -06:00 committed by Bin Meng
parent 5ee94b4f40
commit 2ff50f5fa4
2 changed files with 26 additions and 5 deletions
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1
arch/x86/include/asm/global_data.h
View File

@ -77,6 +77,7 @@ struct arch_global_data {
uint8_t x86_mask;
uint32_t x86_device;
uint64_t tsc_base; /* Initial value returned by rdtsc() */
unsigned long clock_rate; /* Clock rate of timer in Hz */
void *new_fdt; /* Relocated FDT */
uint32_t bist; /* Built-in self test value */
enum pei_boot_mode_t pei_boot_mode;

30
drivers/timer/tsc_timer.c
View File

@ -331,17 +331,17 @@ static int tsc_timer_get_count(struct udevice *dev, u64 *count)
return 0;
}
static int tsc_timer_probe(struct udevice *dev)
static void tsc_timer_ensure_setup(void)
{
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (gd->arch.tsc_base)
return;
gd->arch.tsc_base = rdtsc();
/*
* If there is no clock frequency specified in the device tree,
* calibrate it by ourselves.
*/
if (!uc_priv->clock_rate) {
if (!gd->arch.clock_rate) {
unsigned long fast_calibrate;
fast_calibrate = cpu_mhz_from_msr();
@ -351,12 +351,32 @@ static int tsc_timer_probe(struct udevice *dev)
panic("TSC frequency is ZERO");
}
uc_priv->clock_rate = fast_calibrate * 1000000;
gd->arch.clock_rate = fast_calibrate * 1000000;
}
}
static int tsc_timer_probe(struct udevice *dev)
{
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
tsc_timer_ensure_setup();
uc_priv->clock_rate = gd->arch.clock_rate;
return 0;
}
unsigned long notrace timer_early_get_rate(void)
{
tsc_timer_ensure_setup();
return gd->arch.clock_rate;
}
u64 notrace timer_early_get_count(void)
{
return rdtsc() - gd->arch.tsc_base;
}
static const struct timer_ops tsc_timer_ops = {
.get_count = tsc_timer_get_count,
};