michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers/timer/hpet: Disable FSB interrupts

Browse source 
The front side bus interrupt delivery feature is a somewhat obscure
part of PC history (in some sense a presaging of MSI interrupts) that
we don't use.

But it's part of the spec, works on hardware, has precedence over the
"legacy" interrupt routing feature we do use, and can be legally
enabled by firmware.

Disable at init time.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2020-06-30 15:13:50 -07:00 • committed by Anas Nashif
commit b466e579a3
1 changed files with 2 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/timer/hpet.c
View file

@ -35,6 +35,7 @@
#define TCONF_PERIODIC BIT(3)
#define TCONF_VAL_SET BIT(6)
#define TCONF_MODE32 BIT(8)
#define TCONF_FSB_EN BIT(14) /* FSB interrupt delivery enable */
#define MIN_DELAY 1000
@ -137,6 +138,7 @@ int z_clock_driver_init(struct device *device)
*/
GENERAL_CONF_REG |= GCONF_LR | GCONF_ENABLE;
TIMER0_CONF_REG &= ~TCONF_PERIODIC;
TIMER0_CONF_REG &= ~TCONF_FSB_EN;
TIMER0_CONF_REG |= TCONF_MODE32;
max_ticks = (0x7fffffff - cyc_per_tick) / cyc_per_tick;