[Xen-devel] [PATCH v3 29/62] arm/acpi: Add GTDT support updated by ACPI 5.1

[shannon.zhao@xxxxxxxxxx]

From: Parth Dixit <parth.dixit@xxxxxxxxxx>

With ACPI 5.0, we got per-processor timer support in GTDT,
and ACPI 5.1 introduced the support for platform (memory-mapped)
timers: GT Block and SBSA watchdog timer, add the code needed
for the spec change.

Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Signed-off-by: Naresh Bhat <naresh.bhat@xxxxxxxxxx>
Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 xen/include/acpi/actbl3.h  | 98 +++++++++++++++++++++++++++++++++++++++-------
 xen/include/asm-arm/acpi.h |  2 +
 2 files changed, 85 insertions(+), 15 deletions(-)

diff --git a/xen/include/acpi/actbl3.h b/xen/include/acpi/actbl3.h
index 8c61b5f..fc96963 100644
--- a/xen/include/acpi/actbl3.h
+++ b/xen/include/acpi/actbl3.h
@@ -241,33 +241,101 @@ struct acpi_s3pt_suspend {
 
 
/*******************************************************************************
  *
- * GTDT - Generic Timer Description Table (ACPI 5.0)
- *        Version 1
+ * GTDT - Generic Timer Description Table (ACPI 5.1)
+ *        Version 2
  *
  
******************************************************************************/
 
 struct acpi_table_gtdt {
        struct acpi_table_header header;        /* Common ACPI table header */
-       u64 address;
-       u32 flags;
-       u32 secure_pl1_interrupt;
-       u32 secure_pl1_flags;
-       u32 non_secure_pl1_interrupt;
-       u32 non_secure_pl1_flags;
+       u64 counter_block_addresss;
+       u32 reserved;
+       u32 secure_el1_interrupt;
+       u32 secure_el1_flags;
+       u32 non_secure_el1_interrupt;
+       u32 non_secure_el1_flags;
        u32 virtual_timer_interrupt;
        u32 virtual_timer_flags;
-       u32 non_secure_pl2_interrupt;
-       u32 non_secure_pl2_flags;
+       u32 non_secure_el2_interrupt;
+       u32 non_secure_el2_flags;
+       u64 counter_read_block_address;
+       u32 platform_timer_count;
+       u32 platform_timer_offset;
 };
 
-/* Values for Flags field above */
+/* Flag Definitions: Timer Block Physical Timers and Virtual timers */
+
+#define ACPI_GTDT_INTERRUPT_MODE        (1)
+#define ACPI_GTDT_INTERRUPT_POLARITY    (1<<1)
+#define ACPI_GTDT_ALWAYS_ON             (1<<2)
+
+/* Common GTDT subtable header */
+
+struct acpi_gtdt_header {
+       u8 type;
+       u16 length;
+};
+
+/* Values for GTDT subtable type above */
+
+enum acpi_gtdt_type {
+       ACPI_GTDT_TYPE_TIMER_BLOCK = 0,
+       ACPI_GTDT_TYPE_WATCHDOG = 1,
+       ACPI_GTDT_TYPE_RESERVED = 2     /* 2 and greater are reserved */
+};
+
+/* GTDT Subtables, correspond to Type in struct acpi_gtdt_header */
 
-#define ACPI_GTDT_MAPPED_BLOCK_PRESENT      1
+/* 0: Generic Timer Block */
+
+struct acpi_gtdt_timer_block {
+       struct acpi_gtdt_header header;
+       u8 reserved;
+       u64 block_address;
+       u32 timer_count;
+       u32 timer_offset;
+};
+
+/* Timer Sub-Structure, one per timer */
+
+struct acpi_gtdt_timer_entry {
+       u8 frame_number;
+       u8 reserved[3];
+       u64 base_address;
+       u64 el0_base_address;
+       u32 timer_interrupt;
+       u32 timer_flags;
+       u32 virtual_timer_interrupt;
+       u32 virtual_timer_flags;
+       u32 common_flags;
+};
+
+/* Flag Definitions: timer_flags and virtual_timer_flags above */
+
+#define ACPI_GTDT_GT_IRQ_MODE               (1)
+#define ACPI_GTDT_GT_IRQ_POLARITY           (1<<1)
+
+/* Flag Definitions: common_flags above */
+
+#define ACPI_GTDT_GT_IS_SECURE_TIMER        (1)
+#define ACPI_GTDT_GT_ALWAYS_ON              (1<<1)
+
+/* 1: SBSA Generic Watchdog Structure */
+
+struct acpi_gtdt_watchdog {
+       struct acpi_gtdt_header header;
+       u8 reserved;
+       u64 refresh_frame_address;
+       u64 control_frame_address;
+       u32 timer_interrupt;
+       u32 timer_flags;
+};
 
-/* Values for all "TimerFlags" fields above */
+/* Flag Definitions: timer_flags above */
 
-#define ACPI_GTDT_INTERRUPT_MODE            1
-#define ACPI_GTDT_INTERRUPT_POLARITY        2
+#define ACPI_GTDT_WATCHDOG_IRQ_MODE         (1)
+#define ACPI_GTDT_WATCHDOG_IRQ_POLARITY     (1<<1)
+#define ACPI_GTDT_WATCHDOG_SECURE           (1<<2)
 
 
/*******************************************************************************
  *
diff --git a/xen/include/asm-arm/acpi.h b/xen/include/asm-arm/acpi.h
index 1efa29d..714e596 100644
--- a/xen/include/asm-arm/acpi.h
+++ b/xen/include/asm-arm/acpi.h
@@ -46,4 +46,6 @@ static inline void disable_acpi(void)
     acpi_disabled = 1;
 }
 
+#define ACPI_GTDT_INTR_MASK ( ACPI_GTDT_INTERRUPT_MODE | 
ACPI_GTDT_INTERRUPT_POLARITY )
+
 #endif /*_ASM_ARM_ACPI_H*/
-- 
2.1.0


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