[PATCH 1/2] arm64: arch_timer: acpi: Introduce a generic aquirk framework for erratum
From: guohanjun@huawei.com (Hanjun Guo)
Date: 2017-01-24 10:39:50
Also in:
linux-acpi
Subsystem:
arm architected timer driver, clocksource, clockevent drivers, the rest · Maintainers:
Mark Rutland, Marc Zyngier, Daniel Lezcano, Thomas Gleixner, Linus Torvalds
From: Hanjun Guo <redacted> Introduce a general quirk framework for arch timer erratum in ACPI, which use the oem information in GTDT table for platform specific erratums. The struct gtdt_arch_timer_fixup is introduced to record the oem information to match the quirk and handle the erratum. Signed-off-by: Hanjun Guo <redacted> --- drivers/clocksource/arm_arch_timer.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 2dc571d..80d6f76 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c@@ -1146,6 +1146,39 @@ static int __init arch_timer_mem_of_init(struct device_node *np) arch_timer_mem_of_init); #ifdef CONFIG_ACPI_GTDT +struct gtdt_arch_timer_fixup { + char oem_id[ACPI_OEM_ID_SIZE + 1]; + char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1]; + u32 oem_revision; + + /* quirk handler for arch timer erratum */ + void (*handler)(void *context); + void *context; +}; + +/* note: this needs to be updated according to the doc of OEM ID + * and TABLE ID for different board. + */ +static struct gtdt_arch_timer_fixup arch_timer_quirks[] __initdata = { +}; + +static void __init arch_timer_acpi_quirks_handler(char *oem_id, + char *oem_table_id, + u32 oem_revision) +{ + struct gtdt_arch_timer_fixup *quirks = arch_timer_quirks; + int i; + + for (i = 0; i < ARRAY_SIZE(arch_timer_quirks); i++, quirks++) { + if (!memcmp(quirks->oem_id, oem_id, ACPI_OEM_ID_SIZE) && + !memcmp(quirks->oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE) && + quirks->oem_revision == oem_revision) { + if (quirks->handler && quirks->context) + quirks->handler(quirks->context); + } + } +} + static int __init arch_timer_mem_acpi_init(int platform_timer_count) { struct arch_timer_mem *timer_mem;
@@ -1182,6 +1215,9 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table) return -EINVAL; } + arch_timer_acpi_quirks_handler(table->oem_id, table->oem_table_id, + table->oem_revision); + arch_timers_present |= ARCH_TIMER_TYPE_CP15; ret = acpi_gtdt_init(table, &platform_timer_count);
--
1.7.12.4