diff options
Diffstat (limited to 'gpxe/src/arch/i386/include/pcidirect.h')
-rw-r--r-- | gpxe/src/arch/i386/include/pcidirect.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/include/pcidirect.h b/gpxe/src/arch/i386/include/pcidirect.h new file mode 100644 index 00000000..4e2e9d12 --- /dev/null +++ b/gpxe/src/arch/i386/include/pcidirect.h @@ -0,0 +1,126 @@ +#ifndef _PCIDIRECT_H +#define _PCIDIRECT_H + +#include <stdint.h> +#include <io.h> + +/** @file + * + * PCI configuration space access via Type 1 accesses + * + */ + +#define PCIDIRECT_CONFIG_ADDRESS 0xcf8 +#define PCIDIRECT_CONFIG_DATA 0xcfc + +struct pci_device; + +extern void pcidirect_prepare ( struct pci_device *pci, int where ); + +/** + * Determine maximum PCI bus number within system + * + * @ret max_bus Maximum bus number + */ +static inline int pcidirect_max_bus ( void ) { + /* No way to work this out via Type 1 accesses */ + return 0xff; +} + +/** + * Read byte from PCI configuration space via Type 1 access + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value read + * @ret rc Return status code + */ +static inline __attribute__ (( always_inline )) int +pcidirect_read_config_byte ( struct pci_device *pci, unsigned int where, + uint8_t *value ) { + pcidirect_prepare ( pci, where ); + *value = inb ( PCIDIRECT_CONFIG_DATA + ( where & 3 ) ); + return 0; +} + +/** + * Read word from PCI configuration space via Type 1 access + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value read + * @ret rc Return status code + */ +static inline __attribute__ (( always_inline )) int +pcidirect_read_config_word ( struct pci_device *pci, unsigned int where, + uint16_t *value ) { + pcidirect_prepare ( pci, where ); + *value = inw ( PCIDIRECT_CONFIG_DATA + ( where & 2 ) ); + return 0; +} + +/** + * Read dword from PCI configuration space via Type 1 access + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value read + * @ret rc Return status code + */ +static inline __attribute__ (( always_inline )) int +pcidirect_read_config_dword ( struct pci_device *pci, unsigned int where, + uint32_t *value ) { + pcidirect_prepare ( pci, where ); + *value = inl ( PCIDIRECT_CONFIG_DATA ); + return 0; +} + +/** + * Write byte to PCI configuration space via Type 1 access + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value to be written + * @ret rc Return status code + */ +static inline __attribute__ (( always_inline )) int +pcidirect_write_config_byte ( struct pci_device *pci, unsigned int where, + uint8_t value ) { + pcidirect_prepare ( pci, where ); + outb ( value, PCIDIRECT_CONFIG_DATA + ( where & 3 ) ); + return 0; +} + +/** + * Write word to PCI configuration space via Type 1 access + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value to be written + * @ret rc Return status code + */ +static inline __attribute__ (( always_inline )) int +pcidirect_write_config_word ( struct pci_device *pci, unsigned int where, + uint16_t value ) { + pcidirect_prepare ( pci, where ); + outw ( value, PCIDIRECT_CONFIG_DATA + ( where & 2 ) ); + return 0; +} + +/** + * Write dword to PCI configuration space via Type 1 access + * + * @v pci PCI device + * @v where Location within PCI configuration space + * @v value Value to be written + * @ret rc Return status code + */ +static inline __attribute__ (( always_inline )) int +pcidirect_write_config_dword ( struct pci_device *pci, unsigned int where, + uint32_t value ) { + pcidirect_prepare ( pci, where ); + outl ( value, PCIDIRECT_CONFIG_DATA ); + return 0; +} + +#endif /* _PCIDIRECT_H */ |