diff options
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/arm_arch_timer.c | 83 |
1 files changed, 72 insertions, 11 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 7a8a4117f123..5c5c2af74ad9 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -182,7 +182,9 @@ EXPORT_SYMBOL_GPL(arch_timer_read_ool_enabled); static const struct arch_timer_erratum_workaround ool_workarounds[] = { #ifdef CONFIG_FSL_ERRATUM_A008585 { + .match_type = ate_match_dt, .id = "fsl,erratum-a008585", + .desc = "Freescale erratum a005858", .read_cntp_tval_el0 = fsl_a008585_read_cntp_tval_el0, .read_cntv_tval_el0 = fsl_a008585_read_cntv_tval_el0, .read_cntvct_el0 = fsl_a008585_read_cntvct_el0, @@ -190,13 +192,81 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = { #endif #ifdef CONFIG_HISILICON_ERRATUM_161010101 { + .match_type = ate_match_dt, .id = "hisilicon,erratum-161010101", + .desc = "HiSilicon erratum 161010101", .read_cntp_tval_el0 = hisi_161010101_read_cntp_tval_el0, .read_cntv_tval_el0 = hisi_161010101_read_cntv_tval_el0, .read_cntvct_el0 = hisi_161010101_read_cntvct_el0, }, #endif }; + +typedef bool (*ate_match_fn_t)(const struct arch_timer_erratum_workaround *, + const void *); + +static +bool arch_timer_check_dt_erratum(const struct arch_timer_erratum_workaround *wa, + const void *arg) +{ + const struct device_node *np = arg; + + return of_property_read_bool(np, wa->id); +} + +static const struct arch_timer_erratum_workaround * +arch_timer_iterate_errata(enum arch_timer_erratum_match_type type, + ate_match_fn_t match_fn, + void *arg) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ool_workarounds); i++) { + if (ool_workarounds[i].match_type != type) + continue; + + if (match_fn(&ool_workarounds[i], arg)) + return &ool_workarounds[i]; + } + + return NULL; +} + +static +void arch_timer_enable_workaround(const struct arch_timer_erratum_workaround *wa) +{ + timer_unstable_counter_workaround = wa; + static_branch_enable(&arch_timer_read_ool_enabled); +} + +static void arch_timer_check_ool_workaround(enum arch_timer_erratum_match_type type, + void *arg) +{ + const struct arch_timer_erratum_workaround *wa; + ate_match_fn_t match_fn = NULL; + + if (static_branch_unlikely(&arch_timer_read_ool_enabled)) + return; + + switch (type) { + case ate_match_dt: + match_fn = arch_timer_check_dt_erratum; + break; + default: + WARN_ON(1); + return; + } + + wa = arch_timer_iterate_errata(type, match_fn, arg); + if (!wa) + return; + + arch_timer_enable_workaround(wa); + pr_info("Enabling global workaround for %s\n", wa->desc); +} + +#else +#define arch_timer_check_ool_workaround(t,a) do { } while(0) #endif /* CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND */ static __always_inline @@ -960,17 +1030,8 @@ static int __init arch_timer_of_init(struct device_node *np) arch_timer_c3stop = !of_property_read_bool(np, "always-on"); -#ifdef CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND - for (i = 0; i < ARRAY_SIZE(ool_workarounds); i++) { - if (of_property_read_bool(np, ool_workarounds[i].id)) { - timer_unstable_counter_workaround = &ool_workarounds[i]; - static_branch_enable(&arch_timer_read_ool_enabled); - pr_info("arch_timer: Enabling workaround for %s\n", - timer_unstable_counter_workaround->id); - break; - } - } -#endif + /* Check for globally applicable workarounds */ + arch_timer_check_ool_workaround(ate_match_dt, np); /* * If we cannot rely on firmware initializing the timer registers then |