From: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
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 <hanjun.guo@xxxxxxxxxx>
---
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
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