1 files changed, 74 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/p2sb.c b/src/soc/intel/apollolake/p2sb.c
new file mode 100644
index 0000000000..7834e3866e
--- /dev/null
+++ b/src/soc/intel/apollolake/p2sb.c
@@ -0,0 +1,74 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <rules.h>
+#include <soc/iomap.h>
+#include <soc/pci_devs.h>
+#include <soc/pci_ids.h>
+#include <soc/p2sb.h>
+
+#define P2SB_E0 0xe0
+#define HIDE_BIT (1 << 0)
+
+static void p2sb_set_hide_bit(int hide)
+{
+	struct device *dev;
+	const uint16_t reg = P2SB_E0 + 1;
+	const uint8_t mask = HIDE_BIT;
+	uint8_t val;
+
+	dev = P2SB_DEV;
+
+	val = pci_read_config8(dev, reg);
+	val &= ~mask;
+	if (hide)
+		val |= mask;
+	pci_write_config8(dev, reg, val);
+}
+
+void p2sb_unhide(void)
+{
+	p2sb_set_hide_bit(0);
+}
+
+void p2sb_hide(void)
+{
+	p2sb_set_hide_bit(HIDE_BIT);
+}
+
+static void read_resources(struct device *dev)
+{
+	/*
+	 * There's only one resource on the P2SB device. It's also already
+	 * manually set to a fixed address in earlier boot stages.
+	 */
+	mmio_resource(dev, PCI_BASE_ADDRESS_0, P2SB_BAR / KiB, P2SB_SIZE / KiB);
+}
+
+static const struct device_operations device_ops = {
+	.read_resources		= read_resources,
+	.set_resources		= DEVICE_NOOP,
+};
+
+static const struct pci_driver pmc __pci_driver = {
+	.ops	= &device_ops,
+	.vendor	= PCI_VENDOR_ID_INTEL,
+	.device	= PCI_DEVICE_ID_APOLLOLAKE_P2SB,
+};