diff mbox

[U-Boot,v2,5/7] dm: x86: Add a driver for Intel PCH7

Message ID 1450325556-12403-6-git-send-email-sjg@chromium.org
State Superseded
Headers show

Commit Message

Simon Glass Dec. 17, 2015, 4:12 a.m. UTC 
At some point we may need to distinguish between different types of PCHs,
but for existing supported platforms we only need to worry about version 7
and version 9 bridges. Add a driver for the PCH7.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

Changes in v2:
- Rename the PCH functions
- Update the get_version() handle to use an enum
- Add a function to obtain the SPI base address

 drivers/pch/Makefile |  1 +
 drivers/pch/pch7.c   | 43 +++++++++++++++++++++++++++++++++++++++++++
 include/pch.h        |  4 ++++
 3 files changed, 48 insertions(+)
 create mode 100644 drivers/pch/pch7.c
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Patch

diff --git a/drivers/pch/Makefile b/drivers/pch/Makefile
index d69a99c..33aa727 100644
--- a/drivers/pch/Makefile
+++ b/drivers/pch/Makefile
@@ -3,3 +3,4 @@ 
 #
 
 obj-y += pch-uclass.o
+obj-y += pch7.o
diff --git a/drivers/pch/pch7.c b/drivers/pch/pch7.c
new file mode 100644
index 0000000..4532223
--- /dev/null
+++ b/drivers/pch/pch7.c
@@ -0,0 +1,43 @@ 
+/*
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pch.h>
+
+static int pch7_get_sbase(struct udevice *dev, ulong *sbasep)
+{
+	u32 rcba;
+
+	dm_pci_read_config32(dev, PCH_RCBA, &rcba);
+	/* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable */
+	rcba = rcba & 0xffffc000;
+	*sbasep = rcba + 0x3020;
+
+	return 0;
+}
+
+static enum pch_version pch7_get_version(struct udevice *dev)
+{
+	return PCHV_7;
+}
+
+static const struct pch_ops pch7_ops = {
+	.get_sbase	= pch7_get_sbase,
+	.get_version	= pch7_get_version,
+};
+
+static const struct udevice_id pch7_ids[] = {
+	{ .compatible = "intel,pch7" },
+	{ }
+};
+
+U_BOOT_DRIVER(pch7_drv) = {
+	.name		= "intel-pch7",
+	.id		= UCLASS_PCH,
+	.of_match	= pch7_ids,
+	.ops		= &pch7_ops,
+};
diff --git a/include/pch.h b/include/pch.h
index ef23570..b3f88bd 100644
--- a/include/pch.h
+++ b/include/pch.h
@@ -14,6 +14,10 @@  enum pch_version {
 	PCHV_9,
 };
 
+enum {
+	PCH_RCBA	= 0xf0,
+};
+
 /* Operations for the Platform Controller Hub */
 struct pch_ops {
 	/**