A Peripheral Controller Hub is an Intel concept - it is like the peripherals
on an SoC and is often in a separate chip from the CPU. Even when it is not
it is addressed and used differently. The chip is typically found on the
first PCI device.
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 <s...@chromium.org>
---
arch/x86/lib/Makefile | 1 -
drivers/Makefile | 1 +
drivers/pch/Makefile | 5 +++
{arch/x86/lib => drivers/pch}/pch-uclass.c | 32 +++++++++++++++
include/pch.h | 66 ++++++++++++++++++++++++++++++
5 files changed, 104 insertions(+), 1 deletion(-)
create mode 100644 drivers/pch/Makefile
rename {arch/x86/lib => drivers/pch}/pch-uclass.c (53%)
create mode 100644 include/pch.h
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index cd5ecb6..43792bc 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -24,7 +24,6 @@ obj-$(CONFIG_I8254_TIMER) += i8254.o
ifndef CONFIG_DM_PCI
obj-$(CONFIG_PCI) += pci_type1.o
endif
-obj-y += pch-uclass.o
obj-y += pirq_routing.o
obj-y += relocate.o
obj-y += physmem.o
diff --git a/drivers/Makefile b/drivers/Makefile
index c9031f2..acc6af9 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 0000000..d69a99c
--- /dev/null
+++ b/drivers/pch/Makefile
@@ -0,0 +1,5 @@
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-y += pch-uclass.o
diff --git a/arch/x86/lib/pch-uclass.c b/drivers/pch/pch-uclass.c
similarity index 53%
rename from arch/x86/lib/pch-uclass.c
rename to drivers/pch/pch-uclass.c
index 20dfa81..09a0107 100644
--- a/arch/x86/lib/pch-uclass.c
+++ b/drivers/pch/pch-uclass.c
@@ -7,10 +7,42 @@
#include <common.h>
#include <dm.h>
+#include <pch.h>
#include <dm/root.h>
DECLARE_GLOBAL_DATA_PTR;
+int pch_init(struct udevice *dev)
+{
+ struct pch_ops *ops = pch_get_ops(dev);
+
+ if (!ops->init)
+ return -ENOSYS;
+
+ return ops->init(dev);
+}
+
+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);
+}
+
+int 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);
+}
+
static int pch_uclass_post_bind(struct udevice *bus)
{
/*
diff --git a/include/pch.h b/include/pch.h
new file mode 100644
index 0000000..98bb5f2
--- /dev/null
+++ b/include/pch.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <s...@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __pch_h
+#define __pch_h
+
+struct pch_ops {
+ /**
+ * init() - set up the PCH devices
+ *
+ * This makes sure that all the devices are ready for use. They are
+ * not actually started, just set up so that they can be probed.
+ */
+ int (*init)(struct udevice *dev);
+
+ /**
+ * get_sbase() - get the address of SBASE
+ *
+ * @dev: PCH device to check
+ * @sbasep: Returns address of SBASE if available, else 0
+ * @return 0 if OK, -ve on error (e.g. there is no SBASE)
+ */
+ int (*get_sbase)(struct udevice *dev, ulong *sbasep);
+
+ /**
+ * get_version() - get the PCH version (e.g. 7 or 9)
+ *
+ * @return version, or -1 if unknown
+ */
+ int (*get_version)(struct udevice *dev);
+};
+
+#define pch_get_ops(dev) ((struct pch_ops *)(dev)->driver->ops)
+
+/**
+ * pch_init() - init a PCH
+ *
+ * This makes sure that all the devices are ready for use. They are
+ * not actually started, just set up so that they can be probed.
+ *
+ * @dev: PCH device to init
+ * @return 0 if OK, -ve on error
+ */
+int pch_init(struct udevice *dev);
+
+/**
+ * pch_get_sbase() - get the address of SBASE
+ *
+ * @dev: PCH device to check
+ * @sbasep: Returns address of SBASE if available, else 0
+ * @return 0 if OK, -ve on error (e.g. there is no SBASE)
+ */
+int pch_get_sbase(struct udevice *dev, ulong *sbasep);
+
+/**
+ * pch_get_version() - get the PCH version (e.g. 7 or 9)
+ *
+ * @return version, or -ve if unknown/error
+ */
+int pch_get_version(struct udevice *dev);
+
+#endif
--
2.6.0.rc2.230.g3dd15c0
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