dm: Expand the uclass for Platform Controller Hubs (PCH)

A Platform Controller Hub is an Intel concept - it is like the peripherals
on an SoC and is often in a separate chip from the CPU. The chip is typically
found on the first PCI bus and integrates multiple devices.

We have a very simple uclass to support PCHs. Add a few operations, such as
setting up the devices on the PCH and finding the SPI controller base
address. Also move it into drivers/pch/ since we will be adding a few PCH
drivers.

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

3 files changed, 68 insertions, 0 deletions

diff --git a/drivers/Makefile b/drivers/Makefile
index 00da40b704a..6294048f261 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -51,6 +51,7 @@ obj-y += hwmon/
 obj-y += misc/
 obj-y += pcmcia/
 obj-y += dfu/
+obj-$(CONFIG_X86) += pch/
 obj-y += rtc/
 obj-y += sound/
 obj-y += timer/
diff --git a/drivers/pch/Makefile b/drivers/pch/Makefile
new file mode 100644
index 00000000000..d69a99c2268
--- /dev/null
+++ b/drivers/pch/Makefile
@@ -0,0 +1,5 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y += pch-uclass.o
diff --git a/drivers/pch/pch-uclass.c b/drivers/pch/pch-uclass.c
new file mode 100644
index 00000000000..4579ed12f65
--- /dev/null
+++ b/drivers/pch/pch-uclass.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pch.h>
+#include <dm/root.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int pch_get_sbase(struct udevice *dev, ulong *sbasep)
+{
+	struct pch_ops *ops = pch_get_ops(dev);
+
+	*sbasep = 0;
+	if (!ops->get_sbase)
+		return -ENOSYS;
+
+	return ops->get_sbase(dev, sbasep);
+}
+
+enum pch_version pch_get_version(struct udevice *dev)
+{
+	struct pch_ops *ops = pch_get_ops(dev);
+
+	if (!ops->get_version)
+		return -ENOSYS;
+
+	return ops->get_version(dev);
+}
+
+int pch_set_spi_protect(struct udevice *dev, bool protect)
+{
+	struct pch_ops *ops = pch_get_ops(dev);
+
+	if (!ops->set_spi_protect)
+		return -ENOSYS;
+
+	return ops->set_spi_protect(dev, protect);
+}
+
+static int pch_uclass_post_bind(struct udevice *bus)
+{
+	/*
+	 * Scan the device tree for devices
+	 *
+	 * Before relocation, only bind devices marked for pre-relocation
+	 * use.
+	 */
+	return dm_scan_fdt_node(bus, gd->fdt_blob, bus->of_offset,
+				gd->flags & GD_FLG_RELOC ? false : true);
+}
+
+UCLASS_DRIVER(pch) = {
+	.id		= UCLASS_PCH,
+	.name		= "pch",
+	.post_bind	= pch_uclass_post_bind,
+};