[PATCH 6/9] PCI: copy over some Linux PCI helpers

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Linux PCI drivers, like the incoming 8250_pci, make use of these
helpers. Port them over from Linux v5.4.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/pci/bus.c   | 26 ++++++++++++++++++++++++++
 include/linux/pci.h | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index ac1562330788..251be4fffa6e 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -23,6 +23,32 @@ pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
 	return NULL;
 }
 
+/**
+ * pci_match_id - See if a pci device matches a given pci_id table
+ * @ids: array of PCI device id structures to search in
+ * @dev: the PCI device structure to match against.
+ *
+ * Used by a driver to check whether a PCI device present in the
+ * system is in its list of supported devices.  Returns the matching
+ * pci_device_id structure or %NULL if there is no match.
+ *
+ * Deprecated, don't use this as it will not catch any dynamic ids
+ * that a driver might want to check for.
+ */
+const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
+					 struct pci_dev *dev)
+{
+	if (ids) {
+		while (ids->vendor || ids->subvendor || ids->class_mask) {
+			if (pci_match_one_device(ids, dev))
+				return ids;
+			ids++;
+		}
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(pci_match_id);
+
 static int pci_match(struct device_d *dev, struct driver_d *drv)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d92d70b6bd68..c742570e3684 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -115,6 +115,17 @@ struct pci_dev {
 };
 #define	to_pci_dev(d) container_of(d, struct pci_dev, dev)
 
+#define pci_resource_start(dev, bar)	((dev)->resource[(bar)].start)
+#define pci_resource_end(dev, bar)	((dev)->resource[(bar)].end)
+#define pci_resource_flags(dev, bar)	((dev)->resource[(bar)].flags)
+#define pci_resource_len(dev,bar) \
+	((pci_resource_start((dev), (bar)) == 0 &&	\
+	  pci_resource_end((dev), (bar)) ==		\
+	  pci_resource_start((dev), (bar))) ? 0 :	\
+							\
+	 (pci_resource_end((dev), (bar)) -		\
+	  pci_resource_start((dev), (bar)) + 1))
+
 enum {
 	PCI_BUS_RESOURCE_IO = 0,
 	PCI_BUS_RESOURCE_MEM = 1,
@@ -210,6 +221,20 @@ struct pci_driver {
 	.vendor = (vend), .device = (dev), \
 	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID
 
+/**
+ * PCI_DEVICE_SUB - macro used to describe a specific PCI device with subsystem
+ * @vend: the 16 bit PCI Vendor ID
+ * @dev: the 16 bit PCI Device ID
+ * @subvend: the 16 bit PCI Subvendor ID
+ * @subdev: the 16 bit PCI Subdevice ID
+ *
+ * This macro is used to create a struct pci_device_id that matches a
+ * specific device with subsystem information.
+ */
+#define PCI_DEVICE_SUB(vend, dev, subvend, subdev) \
+	.vendor = (vend), .device = (dev), \
+	.subvendor = (subvend), .subdevice = (subdev)
+
 /**
  * PCI_DEVICE_CLASS - macro used to describe a specific pci device class
  * @dev_class: the class, subclass, prog-if triple for this device
@@ -350,4 +375,13 @@ enum pci_fixup_pass {
 
 void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev);
 
+#ifdef CONFIG_PCI
+const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
+					 struct pci_dev *dev);
+#else
+static inline const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
+							 struct pci_dev *dev)
+{ return NULL; }
+#endif
+
 #endif /* LINUX_PCI_H */
-- 
2.24.0


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