[U-Boot] [PATCH v4 005/100] dm: pci: Move pci_get_devfn() into a common file

[Simon Glass <sjg@chromium.org>]

Early in boot it is necessary to decode the PCI device/function values for
particular peripherals in the device tree or of-platdata. This is needed
in TPL where CONFIG_PCI is not defined.

To handle this, move pci_get_devfn() into a file that is built even when
CONFIG_PCI is not defined.

Also add a function for use by of-platdata, to convert a reg property to
a pci_dev_t.

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

Changes in v4:
- Add more documentation for pci_ofplat_get_devfn()
- Mention that the return value is pci_dev_t
- Rename pci_x86_ofplat_get_devfn() to pci_ofplat_get_devfn()

Changes in v3:
- Move the function to a common file instead of duplicating it
- Update device type to pci_dev_t

Changes in v2: None

 drivers/core/util.c      | 20 +++++++++++++++++++
 drivers/pci/pci-uclass.c | 16 ---------------
 include/dm/pci.h         | 43 ++++++++++++++++++++++++++++++++++++++++
 include/pci.h            | 12 ++---------
 4 files changed, 65 insertions(+), 26 deletions(-)
 create mode 100644 include/dm/pci.h

diff --git a/drivers/core/util.c b/drivers/core/util.c
index 7dc1a2af02..69f83755f0 100644
--- a/drivers/core/util.c
+++ b/drivers/core/util.c
@@ -4,7 +4,9 @@
  */
 
 #include <common.h>
+#include <dm/device.h>
 #include <dm/ofnode.h>
+#include <dm/read.h>
 #include <dm/util.h>
 #include <linux/libfdt.h>
 #include <vsprintf.h>
@@ -58,3 +60,21 @@ bool dm_ofnode_pre_reloc(ofnode node)
 #endif
 }
 #endif
+
+#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+int pci_get_devfn(struct udevice *dev)
+{
+	struct fdt_pci_addr addr;
+	int ret;
+
+	/* Extract the devfn from fdt_pci_addr */
+	ret = ofnode_read_pci_addr(dev_ofnode(dev), FDT_PCI_SPACE_CONFIG,
+				   "reg", &addr);
+	if (ret) {
+		if (ret != -ENOENT)
+			return -EINVAL;
+	}
+
+	return addr.phys_hi & 0xff00;
+}
+#endif
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index b09fb4f993..3863262ebe 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1018,22 +1018,6 @@ static int pci_uclass_post_probe(struct udevice *bus)
 	return 0;
 }
 
-int pci_get_devfn(struct udevice *dev)
-{
-	struct fdt_pci_addr addr;
-	int ret;
-
-	/* Extract the devfn from fdt_pci_addr */
-	ret = ofnode_read_pci_addr(dev_ofnode(dev), FDT_PCI_SPACE_CONFIG,
-				   "reg", &addr);
-	if (ret) {
-		if (ret != -ENOENT)
-			return -EINVAL;
-	}
-
-	return addr.phys_hi & 0xff00;
-}
-
 static int pci_uclass_child_post_bind(struct udevice *dev)
 {
 	struct pci_child_platdata *pplat;
diff --git a/include/dm/pci.h b/include/dm/pci.h
new file mode 100644
index 0000000000..4faf09f05f
--- /dev/null
+++ b/include/dm/pci.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2019 Google, Inc
+ */
+
+#ifndef __DM_PCI_H
+#define __DM_PCI_H
+
+struct udevice;
+
+/**
+ * pci_get_devfn() - Extract the devfn from fdt_pci_addr of the device
+ *
+ * Get devfn from fdt_pci_addr of the specified device
+ *
+ * This returns an int to avoid a dependency on pci.h
+ *
+ * @dev:	PCI device
+ * @return devfn in bits 15...8 if found (pci_dev_t format), or -ENODEV if not
+ *	found
+ */
+int pci_get_devfn(struct udevice *dev);
+
+/**
+ * pci_x86_ofplat_get_devfn() - Get the PCI dev/fn from of-platdata
+ *
+ * This function is used to obtain a PCI device/function from of-platdata
+ * register data. In this case the first cell of the 'reg' property contains
+ * the required information.
+ *
+ * This returns an int to avoid a dependency on pci.h
+ *
+ * @reg: reg value from dt-platdata.c array (first member). This is not a
+ *	pointer type, since the caller may use fdt32_t or fdt64_t depending on
+ *	the address sizes.
+ * @return device/function for that device (pci_dev_t format)
+ */
+static inline int pci_ofplat_get_devfn(u32 reg)
+{
+	return reg & 0xff00;
+}
+
+#endif
diff --git a/include/pci.h b/include/pci.h
index de17d0ffba..8c761d8da3 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -482,6 +482,8 @@
 
 #ifndef __ASSEMBLY__
 
+#include <dm/pci.h>
+
 #ifdef CONFIG_SYS_PCI_64BIT
 typedef u64 pci_addr_t;
 typedef u64 pci_size_t;
@@ -1619,16 +1621,6 @@ int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
  */
 int sandbox_pci_get_client(struct udevice *emul, struct udevice **devp);
 
-/**
- * pci_get_devfn() - Extract the devfn from fdt_pci_addr of the device
- *
- * Get devfn from fdt_pci_addr of the specified device
- *
- * @dev:	PCI device
- * @return devfn in bits 15...8 if found, -ENODEV if not found
- */
-int pci_get_devfn(struct udevice *dev);
-
 #endif /* CONFIG_DM_PCI */
 
 /**
-- 
2.24.0.432.g9d3f5f5b63-goog