x86: apl: Add PCH driver

Add a driver for the Apollo Lake Platform Controller Hub. It does not have
any functionality and is just a placeholder for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/arch/x86/cpu/apollolake/Makefile b/arch/x86/cpu/apollolake/Makefile
index 31045a03c1..36eefcbad7 100644
--- a/arch/x86/cpu/apollolake/Makefile
+++ b/arch/x86/cpu/apollolake/Makefile
@@ -7,5 +7,6 @@ obj-$(CONFIG_SPL_BUILD) += systemagent.o
 obj-y += hostbridge.o
 obj-y += itss.o
 obj-y += lpc.o
+obj-y += pch.o
 obj-y += pmc.o
 obj-y += uart.o
diff --git a/arch/x86/cpu/apollolake/pch.c b/arch/x86/cpu/apollolake/pch.c
new file mode 100644
index 0000000000..1a5a985221
--- /dev/null
+++ b/arch/x86/cpu/apollolake/pch.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pch.h>
+#include <spl.h>
+#include <asm/lpc_common.h>
+
+#define BIOS_CTRL	0xdc
+
+static int apl_set_spi_protect(struct udevice *dev, bool protect)
+{
+	if (spl_phase() == PHASE_SPL)
+		return lpc_set_spi_protect(dev, BIOS_CTRL, protect);
+
+	return 0;
+}
+
+static const struct pch_ops apl_pch_ops = {
+	.set_spi_protect = apl_set_spi_protect,
+};
+
+static const struct udevice_id apl_pch_ids[] = {
+	{ .compatible = "intel,apl-pch" },
+	{ }
+};
+
+U_BOOT_DRIVER(apl_pch) = {
+	.name		= "apl_pch",
+	.id		= UCLASS_PCH,
+	.of_match	= apl_pch_ids,
+	.ops		= &apl_pch_ops,
+};