[pci] Define pci_ioremap() for mapping PCI bus addresses

Define pci_ioremap() as a wrapper around ioremap() that could allow
for a non-zero address translation offset.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/core/pcidirect.c

@@ -52,3 +52,4 @@ PROVIDE_PCIAPI_INLINE ( direct, pci_read_config_dword );
 PROVIDE_PCIAPI_INLINE ( direct, pci_write_config_byte );
 PROVIDE_PCIAPI_INLINE ( direct, pci_write_config_word );
 PROVIDE_PCIAPI_INLINE ( direct, pci_write_config_dword );
+PROVIDE_PCIAPI_INLINE ( direct, pci_ioremap );

src/arch/x86/include/ipxe/pcibios.h

@@ -132,4 +132,17 @@ PCIAPI_INLINE ( pcbios, pci_write_config_dword ) ( struct pci_device *pci,
 	return pcibios_write ( pci, PCIBIOS_WRITE_CONFIG_DWORD | where, value);
 }
 
+/**
+ * Map PCI bus address as an I/O address
+ *
+ * @v bus_addr		PCI bus address
+ * @v len		Length of region
+ * @ret io_addr		I/O address, or NULL on error
+ */
+static inline __always_inline void *
+PCIAPI_INLINE ( pcbios, pci_ioremap ) ( struct pci_device *pci __unused,
+					unsigned long bus_addr, size_t len ) {
+	return ioremap ( bus_addr, len );
+}
+
 #endif /* _IPXE_PCIBIOS_H */

src/arch/x86/include/ipxe/pcidirect.h

@@ -138,4 +138,17 @@ PCIAPI_INLINE ( direct, pci_write_config_dword ) ( struct pci_device *pci,
 	return 0;
 }
 
+/**
+ * Map PCI bus address as an I/O address
+ *
+ * @v bus_addr		PCI bus address
+ * @v len		Length of region
+ * @ret io_addr		I/O address, or NULL on error
+ */
+static inline __always_inline void *
+PCIAPI_INLINE ( direct, pci_ioremap ) ( struct pci_device *pci __unused,
+					unsigned long bus_addr, size_t len ) {
+	return ioremap ( bus_addr, len );
+}
+
 #endif /* _PCIDIRECT_H */

src/arch/x86/interface/pcbios/pcibios.c

@@ -121,3 +121,4 @@ PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_dword );
 PROVIDE_PCIAPI_INLINE ( pcbios, pci_write_config_byte );
 PROVIDE_PCIAPI_INLINE ( pcbios, pci_write_config_word );
 PROVIDE_PCIAPI_INLINE ( pcbios, pci_write_config_dword );
+PROVIDE_PCIAPI_INLINE ( pcbios, pci_ioremap );

src/include/ipxe/efi/efi_pci_api.h

@@ -148,4 +148,17 @@ PCIAPI_INLINE ( efi, pci_write_config_dword ) ( struct pci_device *pci,
 			      value );
 }
 
+/**
+ * Map PCI bus address as an I/O address
+ *
+ * @v bus_addr		PCI bus address
+ * @v len		Length of region
+ * @ret io_addr		I/O address, or NULL on error
+ */
+static inline __always_inline void *
+PCIAPI_INLINE ( efi, pci_ioremap ) ( struct pci_device *pci __unused,
+				     unsigned long bus_addr, size_t len ) {
+	return ioremap ( bus_addr, len );
+}
+
 #endif /* _IPXE_EFI_PCI_API_H */

src/include/ipxe/linux/linux_pci.h

@@ -127,4 +127,17 @@ PCIAPI_INLINE ( linux, pci_write_config_dword ) ( struct pci_device *pci,
 	return linux_pci_write ( pci, where, value, sizeof ( value ) );
 }
 
+/**
+ * Map PCI bus address as an I/O address
+ *
+ * @v bus_addr		PCI bus address
+ * @v len		Length of region
+ * @ret io_addr		I/O address, or NULL on error
+ */
+static inline __always_inline void *
+PCIAPI_INLINE ( linux, pci_ioremap ) ( struct pci_device *pci __unused,
+				       unsigned long bus_addr, size_t len ) {
+	return ioremap ( bus_addr, len );
+}
+
 #endif /* _IPXE_LINUX_PCI_H */

src/include/ipxe/pci_io.h

@@ -11,6 +11,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/api.h>
+#include <ipxe/iomap.h>
 #include <config/ioapi.h>
 
 /**
@@ -122,4 +123,14 @@ int pci_write_config_word ( struct pci_device *pci, unsigned int where,
 int pci_write_config_dword ( struct pci_device *pci, unsigned int where,
 			     uint32_t value );
 
+/**
+ * Map PCI bus address as an I/O address
+ *
+ * @v bus_addr		PCI bus address
+ * @v len		Length of region
+ * @ret io_addr		I/O address, or NULL on error
+ */
+void * pci_ioremap ( struct pci_device *pci, unsigned long bus_addr,
+		     size_t len );
+
 #endif /* _IPXE_PCI_IO_H */

src/interface/efi/efi_pci.c

@@ -231,6 +231,7 @@ PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_dword );
 PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_byte );
 PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_word );
 PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_dword );
+PROVIDE_PCIAPI_INLINE ( efi, pci_ioremap );
 
 /******************************************************************************
  *