[U-Boot] [PATCH v2 5/8] x86: slimbootloader: Set TSC information for timer driver

[U-Boot] [PATCH v2 5/8] x86: slimbootloader: Set TSC information for timer driver

[Park, Aiden]

- Get TSC frequency from performance info hob
- Set tsc_base and clock_rate for timer driver

Signed-off-by: Aiden Park <aiden.park@intel.com>
---
 arch/x86/cpu/slimbootloader/slimbootloader.c  | 31 +++++++++++++++++++
 .../asm/arch-slimbootloader/slimbootloader.h  | 26 ++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/arch/x86/cpu/slimbootloader/slimbootloader.c b/arch/x86/cpu/slimbootloader/slimbootloader.c
index 9f3a61ec61..e2bab99461 100644
--- a/arch/x86/cpu/slimbootloader/slimbootloader.c
+++ b/arch/x86/cpu/slimbootloader/slimbootloader.c
@@ -4,9 +4,40 @@
  */
 
 #include <common.h>
+#include <asm/arch/slimbootloader.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * This sets tsc_base and clock_rate for early_timer and tsc_timer.
+ * The performance info guid hob has all performance timestamp data, but
+ * the only tsc frequency info is used for the timer driver for now.
+ */
+static void tsc_init(void)
+{
+	struct performance_info *data = NULL;
+	const struct efi_guid guid = LOADER_PERFORMANCE_INFO_GUID;
+
+	gd->arch.tsc_base = rdtsc();
+	debug("tsc_base=0x%llx\n", gd->arch.tsc_base);
+
+	data = (struct performance_info *)
+		get_next_guid_hob_data(&guid, gd->arch.hob_list);
+
+	if (!data) {
+		debug("performance info hob not found\n");
+		return;
+	}
+
+	/* frequency is in KHz, so to Hz */
+	gd->arch.clock_rate = data->frequency * 1000;
+	debug("freq=0x%lx\n", gd->arch.clock_rate);
+}
 
 int arch_cpu_init(void)
 {
+	tsc_init();
+
 	return x86_cpu_init_f();
 }
 
diff --git a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
index b05e527148..0b908f7c3e 100644
--- a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
+++ b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
@@ -22,6 +22,12 @@
 	{ 0xbb, 0x98, 0x95, 0x8d, 0x62, 0xde, 0x87, 0xf1 } \
 	}
 
+#define LOADER_PERFORMANCE_INFO_GUID \
+	{ \
+	0x868204be, 0x23d0, 0x4ff9, \
+	{ 0xac, 0x34, 0xb9, 0x95, 0xac, 0x04, 0xb1, 0xb9 } \
+	}
+
 /**
  * A single entry of memory map information
  *
@@ -81,6 +87,26 @@ struct serial_port_info {
 	u32     rsvd1;
 } __packed;
 
+/**
+ * This includes timestamp data which has been collected
+ * in Slim Bootloader stages.
+ *
+ * @rev   : revision of performance_info structure. currently 1.
+ * @rsvd  : padding for alignment
+ * @count : the number of collected timestamp data
+ * @flags : only used in Slim Bootloader
+ * @frequency: tsc frequency in KHz
+ * @timestamp: the array of timestamp data which has 64-bit tsc value
+ */
+struct performance_info {
+	u8      rev;
+	u8      rsvd[3];
+	u16     count;
+	u16     flags;
+	u32     frequency;
+	u64     timestamp[0];
+} __packed;
+
 /**
  * This returns a pointer to hob data buffer if the given guid hob is found.
  *
-- 
2.20.1