x86: acpi: Support generation of the HPET table

Add an implementation of the HPET (High Precision Event Timer) ACPI
table. Since this is x86-specific, put it in an x86-specific file

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 22 insertions, 9 deletions

diff --git a/include/acpi/acpi_table.h b/include/acpi/acpi_table.h
index fe9b29f..f814044 100644
--- a/include/acpi/acpi_table.h
+++ b/include/acpi/acpi_table.h
@@ -20,6 +20,9 @@
 #define OEM_TABLE_ID		"U-BOOTBL"	/* U-Boot Table */
 #define ASLC_ID			"INTL"		/* Intel ASL Compiler */
 
+/* TODO(sjg@chromium.org): Figure out how to get compiler revision */
+#define ASL_REVISION	0
+
 #define ACPI_RSDP_REV_ACPI_1_0	0
 #define ACPI_RSDP_REV_ACPI_2_0	2
 
@@ -56,6 +59,15 @@ struct __packed acpi_table_header {
 	u32 aslc_revision;	/* ASL compiler revision number */
 };
 
+struct acpi_gen_regaddr {
+	u8 space_id;	/* Address space ID */
+	u8 bit_width;	/* Register size in bits */
+	u8 bit_offset;	/* Register bit offset */
+	u8 access_size;	/* Access size */
+	u32 addrl;	/* Register address, low 32 bits */
+	u32 addrh;	/* Register address, high 32 bits */
+};
+
 /* A maximum number of 32 ACPI tables ought to be enough for now */
 #define MAX_ACPI_TABLES		32
 
@@ -71,6 +83,16 @@ struct acpi_xsdt {
 	u64 entry[MAX_ACPI_TABLES];
 };
 
+/* HPET timers */
+struct __packed acpi_hpet {
+	struct acpi_table_header header;
+	u32 id;
+	struct acpi_gen_regaddr addr;
+	u8 number;
+	u16 min_tick;
+	u8 attributes;
+};
+
 /* FADT Preferred Power Management Profile */
 enum acpi_pm_profile {
 	ACPI_PM_UNSPECIFIED = 0,
@@ -138,15 +160,6 @@ enum acpi_address_space_size {
 	ACPI_ACCESS_SIZE_QWORD_ACCESS
 };
 
-struct acpi_gen_regaddr {
-	u8 space_id;	/* Address space ID */
-	u8 bit_width;	/* Register size in bits */
-	u8 bit_offset;	/* Register bit offset */
-	u8 access_size;	/* Access size */
-	u32 addrl;	/* Register address, low 32 bits */
-	u32 addrh;	/* Register address, high 32 bits */
-};
-
 /* FADT (Fixed ACPI Description Table) */
 struct __packed acpi_fadt {
 	struct acpi_table_header header;