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>
diff --git a/include/pch.h b/include/pch.h
new file mode 100644
index 0000000..ff26865
--- /dev/null
+++ b/include/pch.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __pch_h
+#define __pch_h
+
+enum pch_version {
+ PCHV_UNKNOWN,
+ PCHV_7,
+ PCHV_9,
+};
+
+/* Operations for the Platform Controller Hub */
+struct pch_ops {
+ /**
+ * get_sbase() - get the address of SPI base
+ *
+ * @dev: PCH device to check
+ * @sbasep: Returns address of SPI base if available, else 0
+ * @return 0 if OK, -ve on error (e.g. there is no SPI base)
+ */
+ int (*get_sbase)(struct udevice *dev, ulong *sbasep);
+
+ /**
+ * get_version() - get the PCH version
+ *
+ * @return version, or -ENOSYS if unknown
+ */
+ enum pch_version (*get_version)(struct udevice *dev);
+
+ /**
+ * set_spi_protect() - set whether SPI flash is protected or not
+ *
+ * @dev: PCH device to adjust
+ * @protect: true to protect, false to unprotect
+ *
+ * @return 0 on success, -ENOSYS if not implemented
+ */
+ int (*set_spi_protect)(struct udevice *dev, bool protect);
+};
+
+#define pch_get_ops(dev) ((struct pch_ops *)(dev)->driver->ops)
+
+/**
+ * pch_get_sbase() - get the address of SPI base
+ *
+ * @dev: PCH device to check
+ * @sbasep: Returns address of SPI base if available, else 0
+ * @return 0 if OK, -ve on error (e.g. there is no SPI base)
+ */
+int pch_get_sbase(struct udevice *dev, ulong *sbasep);
+
+/**
+ * pch_get_version() - get the PCH version
+ *
+ * @return version, or -ENOSYS if unknown
+ */
+enum pch_version pch_get_version(struct udevice *dev);
+
+/**
+ * set_spi_protect() - set whether SPI flash is protected or not
+ *
+ * @dev: PCH device to adjust
+ * @protect: true to protect, false to unprotect
+ *
+ * @return 0 on success, -ENOSYS if not implemented
+ */
+int pch_set_spi_protect(struct udevice *dev, bool protect);
+
+#endif