diff options
| -rw-r--r-- | common/efi/efi.c | 8 | ||||
| -rw-r--r-- | drivers/clocksource/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/clocksource/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clocksource/efi.c | 110 |
4 files changed, 123 insertions, 0 deletions
diff --git a/common/efi/efi.c b/common/efi/efi.c index 4b589b600f..05c58250f4 100644 --- a/common/efi/efi.c +++ b/common/efi/efi.c @@ -353,6 +353,14 @@ efi_status_t efi_main(efi_handle_t image, efi_system_table_t *sys_table) return EFI_SUCCESS; } +static int efi_core_init(void) +{ + struct device_d *dev = device_alloc("efi-cs", DEVICE_ID_SINGLE); + + return platform_device_register(dev); +} +core_initcall(efi_core_init); + static int efi_postcore_init(void) { char *uuid; diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 9b7f0a9d7f..b12a854031 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -34,6 +34,10 @@ config CLOCKSOURCE_DUMMY_RATE The option CONFIG_CLOCKSOURCE_DUMMY_RATE is used to adjust this clocksource. The bigger rate valuest makes clocksource "faster". +config CLOCKSOURCE_EFI + bool "Generic EFI Driver" + depends on EFI_BOOTUP + config CLOCKSOURCE_EFI_X86 bool "EFI X86 HW driver" depends on EFI_BOOTUP && X86 diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 1fd18296ea..f69b33d0b9 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -3,6 +3,7 @@ obj-$(CONFIG_ARM_SMP_TWD) += arm_smp_twd.o obj-$(CONFIG_CLOCKSOURCE_BCM283X) += bcm2835.o obj-$(CONFIG_CLOCKSOURCE_CLPS711X) += clps711x.o obj-$(CONFIG_CLOCKSOURCE_DIGIC) += digic.o +obj-$(CONFIG_CLOCKSOURCE_EFI) += efi.o obj-$(CONFIG_CLOCKSOURCE_EFI_X86) += efi_x86.o obj-$(CONFIG_CLOCKSOURCE_MVEBU) += mvebu.o obj-$(CONFIG_CLOCKSOURCE_NOMADIK) += nomadik.o diff --git a/drivers/clocksource/efi.c b/drivers/clocksource/efi.c new file mode 100644 index 0000000000..89906c452e --- /dev/null +++ b/drivers/clocksource/efi.c @@ -0,0 +1,110 @@ +/* + * Copyright (C) 2017 Jean-Christophe PLAGNIOL-VILLARD <plagnio@jcrosoft.com> + * + * Under GPL v2 + */ +#include <common.h> +#include <init.h> +#include <driver.h> +#include <clock.h> +#include <efi.h> +#include <efi/efi.h> +#include <efi/efi-device.h> +#include <linux/err.h> + +static uint64_t ticks = 1; +static void *efi_cs_evt; + +static uint64_t efi_cs_read(void) +{ + return ticks; +} + +static void efi_cs_inc(void *event, void *ctx) +{ + ticks++; +} + +/* count ticks during a 1dms */ +static uint64_t ticks_freq(void) +{ + uint64_t ticks_start, ticks_end; + + ticks_start = ticks; + BS->stall(1000); + ticks_end = ticks; + + return (ticks_end - ticks_start) * 1000; +} + +/* count ticks during a 20ms delay as on qemu x86_64 the max is 100Hz */ +static uint64_t ticks_freq_x86(void) +{ + uint64_t ticks_start, ticks_end; + + ticks_start = ticks; + BS->stall(20 * 1000); + ticks_end = ticks; + + return (ticks_end - ticks_start) * 50; +} + +static int efi_cs_init(struct clocksource *cs) +{ + efi_status_t efiret; + uint64_t freq; + + efiret = BS->create_event(EFI_EVT_TIMER | EFI_EVT_NOTIFY_SIGNAL, + EFI_TPL_CALLBACK, efi_cs_inc, NULL, &efi_cs_evt); + + if (EFI_ERROR(efiret)) + return -efi_errno(efiret); + + efiret = BS->set_timer(efi_cs_evt, EFI_TIMER_PERIODIC, 10); + if (EFI_ERROR(efiret)) { + BS->close_event(efi_cs_evt); + return -efi_errno(efiret); + } + + freq = 1000 * 1000; + if (ticks_freq() < 800 * 1000) { + uint64_t nb_100ns; + + freq = ticks_freq_x86(); + nb_100ns = 10 * 1000 * 1000 / freq; + pr_warn("EFI Event timer too slow freq = %llu Hz\n", freq); + efiret = BS->set_timer(efi_cs_evt, EFI_TIMER_PERIODIC, nb_100ns); + if (EFI_ERROR(efiret)) { + BS->close_event(efi_cs_evt); + return -efi_errno(efiret); + } + } + + cs->mult = clocksource_hz2mult(freq, cs->shift); + + return 0; +} + +static struct clocksource efi_cs = { + .read = efi_cs_read, + .mask = CLOCKSOURCE_MASK(64), + .shift = 0, + .init = efi_cs_init, +}; + +static int efi_cs_probe(struct device_d *dev) +{ + return init_clock(&efi_cs); +} + +static struct driver_d efi_cs_driver = { + .name = "efi-cs", + .probe = efi_cs_probe, +}; + +static int efi_cs_initcall(void) +{ + return platform_driver_register(&efi_cs_driver); +} +/* for efi the time must be init at core initcall level */ +core_initcall(efi_cs_initcall); |