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Diffstat (limited to 'src/include/ipxe/ecam_io.h')
-rw-r--r-- | src/include/ipxe/ecam_io.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/include/ipxe/ecam_io.h b/src/include/ipxe/ecam_io.h new file mode 100644 index 0000000..4fb24db --- /dev/null +++ b/src/include/ipxe/ecam_io.h @@ -0,0 +1,139 @@ +#ifndef _IPXE_ECAM_IO_H +#define _IPXE_ECAM_IO_H + +/** @file + * + * PCI I/O API for Enhanced Configuration Access Mechanism (ECAM) + * + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +#include <stdint.h> + +#ifdef PCIAPI_ECAM +#define PCIAPI_PREFIX_ecam +#else +#define PCIAPI_PREFIX_ecam __ecam_ +#endif + +struct pci_device; + +/** Construct ECAM location */ +#define ECAM_LOC( where, len ) ( ( (len) << 16 ) | where ) + +/** Extract offset from ECAM location */ +#define ECAM_WHERE( location ) ( (location) & 0xffff ) + +/** Extract length from ECAM location */ +#define ECAM_LEN( location ) ( (location) >> 16 ) + +extern int ecam_read ( struct pci_device *pci, unsigned int location, + void *value ); +extern int ecam_write ( struct pci_device *pci, unsigned int location, + unsigned long value ); + +/** + * Read byte from PCI configuration space via ECAM + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value read + * @ret rc Return status code + */ +static inline __always_inline int +PCIAPI_INLINE ( ecam, pci_read_config_byte ) ( struct pci_device *pci, + unsigned int where, + uint8_t *value ) { + return ecam_read ( pci, ECAM_LOC ( where, sizeof ( *value ) ), value ); +} + +/** + * Read word from PCI configuration space via ECAM + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value read + * @ret rc Return status code + */ +static inline __always_inline int +PCIAPI_INLINE ( ecam, pci_read_config_word ) ( struct pci_device *pci, + unsigned int where, + uint16_t *value ) { + return ecam_read ( pci, ECAM_LOC ( where, sizeof ( *value ) ), value ); +} + +/** + * Read dword from PCI configuration space via ECAM + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value read + * @ret rc Return status code + */ +static inline __always_inline int +PCIAPI_INLINE ( ecam, pci_read_config_dword ) ( struct pci_device *pci, + unsigned int where, + uint32_t *value ) { + return ecam_read ( pci, ECAM_LOC ( where, sizeof ( *value ) ), value ); +} + +/** + * Write byte to PCI configuration space via ECAM + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value to be written + * @ret rc Return status code + */ +static inline __always_inline int +PCIAPI_INLINE ( ecam, pci_write_config_byte ) ( struct pci_device *pci, + unsigned int where, + uint8_t value ) { + return ecam_write ( pci, ECAM_LOC ( where, sizeof ( value ) ), value ); +} + +/** + * Write word to PCI configuration space via ECAM + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value to be written + * @ret rc Return status code + */ +static inline __always_inline int +PCIAPI_INLINE ( ecam, pci_write_config_word ) ( struct pci_device *pci, + unsigned int where, + uint16_t value ) { + return ecam_write ( pci, ECAM_LOC ( where, sizeof ( value ) ), value ); +} + +/** + * Write dword to PCI configuration space via ECAM + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value to be written + * @ret rc Return status code + */ +static inline __always_inline int +PCIAPI_INLINE ( ecam, pci_write_config_dword ) ( struct pci_device *pci, + unsigned int where, + uint32_t value ) { + return ecam_write ( pci, ECAM_LOC ( where, sizeof ( value ) ), 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 ( ecam, pci_ioremap ) ( struct pci_device *pci __unused, + unsigned long bus_addr, size_t len ) { + return ioremap ( bus_addr, len ); +} + +#endif /* _IPXE_ECAM_IO_H */ |