pciextra.c File Reference

#include <stdint.h>
#include <ipxe/timer.h>
#include <ipxe/pci.h>
#include <ipxe/pcibackup.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static int	pci_find_capability_common (struct pci_device *pci, uint8_t pos, int cap)
int	pci_find_capability (struct pci_device *pci, int cap)
	Look for a PCI capability. More...
int	pci_find_next_capability (struct pci_device *pci, int pos, int cap)
	Look for another PCI capability. More...
void	pci_reset (struct pci_device *pci, unsigned int exp)
	Perform PCI Express function-level reset (FLR) More...

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

pci_find_capability_common()

static int pci_find_capability_common ( struct pci_device *  pci, uint8_t  pos, int  cap  )

static

Definition at line 8 of file pciextra.c.

                                                               {
        uint8_t id;
        int ttl = 48;

        while ( ttl-- && pos >= 0x40 ) {
                pos &= ~3;
                pci_read_config_byte ( pci, pos + PCI_CAP_ID, &id );
                DBG ( "PCI Capability: %d\n", id );
                if ( id == 0xff )
                        break;
                if ( id == cap )
                        return pos;
                pci_read_config_byte ( pci, pos + PCI_CAP_NEXT, &pos );
        }
        return 0;
}

References DBG, id, PCI_CAP_ID, PCI_CAP_NEXT, and pci_read_config_byte().

Referenced by pci_find_capability(), and pci_find_next_capability().

pci_find_capability()

int pci_find_capability	(	struct pci_device *	pci,
		int	cap
	)

Look for a PCI capability.

Parameters

pci	PCI device to query
cap	Capability code

Return values

address

Address of capability, or 0 if not found

Determine whether or not a device supports a given PCI capability. Returns the address of the requested capability structure within the device's PCI configuration space, or 0 if the device does not support it.

Definition at line 38 of file pciextra.c.

                                                            {
        uint16_t status;
        uint8_t pos;
        uint8_t hdr_type;

        pci_read_config_word ( pci, PCI_STATUS, &status );
        if ( ! ( status & PCI_STATUS_CAP_LIST ) )
                return 0;

        pci_read_config_byte ( pci, PCI_HEADER_TYPE, &hdr_type );
        switch ( hdr_type & PCI_HEADER_TYPE_MASK ) {
        case PCI_HEADER_TYPE_NORMAL:
        case PCI_HEADER_TYPE_BRIDGE:
        default:
                pci_read_config_byte ( pci, PCI_CAPABILITY_LIST, &pos );
                break;
        case PCI_HEADER_TYPE_CARDBUS:
                pci_read_config_byte ( pci, PCI_CB_CAPABILITY_LIST, &pos );
                break;
        }
        return pci_find_capability_common ( pci, pos, cap );
}

References PCI_CAPABILITY_LIST, PCI_CB_CAPABILITY_LIST, pci_find_capability_common(), PCI_HEADER_TYPE, PCI_HEADER_TYPE_BRIDGE, PCI_HEADER_TYPE_CARDBUS, PCI_HEADER_TYPE_MASK, PCI_HEADER_TYPE_NORMAL, pci_read_config_byte(), pci_read_config_word(), PCI_STATUS, PCI_STATUS_CAP_LIST, and status.

Referenced by ath5k_hw_attach(), ath5k_hw_nic_wakeup(), bnx2_init_board(), ice_probe(), intelxl_probe(), intelxlvf_probe(), myri10ge_pci_probe(), pci_msix_enable(), pci_vpd_init(), pciea_offset(), sky2_reset(), sky2_rx_start(), tg3_get_invariants(), undinet_irq_is_broken(), and virtio_pci_find_capability().

pci_find_next_capability()

int pci_find_next_capability	(	struct pci_device *	pci,
		int	pos,
		int	cap
	)

Look for another PCI capability.

Parameters

pci	PCI device to query
pos	Address of the current capability
cap	Capability code

Return values

address

Address of capability, or 0 if not found

Determine whether or not a device supports a given PCI capability starting the search at a given address within the device's PCI configuration space. Returns the address of the next capability structure within the device's PCI configuration space, or 0 if the device does not support another such capability.

Definition at line 75 of file pciextra.c.

                                                                          {
        uint8_t new_pos;

        pci_read_config_byte ( pci, pos + PCI_CAP_NEXT, &new_pos );
        return pci_find_capability_common ( pci, new_pos, cap );
}

References PCI_CAP_NEXT, pci_find_capability_common(), and pci_read_config_byte().

Referenced by virtio_pci_find_capability().

pci_reset()

void pci_reset	(	struct pci_device *	pci,
		unsigned int	exp
	)

Perform PCI Express function-level reset (FLR)

Parameters

pci	PCI device
exp	PCI Express Capability address

Definition at line 88 of file pciextra.c.

                                                            {
        struct pci_config_backup backup;
        uint16_t control;

        /* Back up configuration space */
        pci_backup ( pci, &backup, PCI_CONFIG_BACKUP_STANDARD, NULL );

        /* Perform a PCIe function-level reset */
        pci_read_config_word ( pci, ( exp + PCI_EXP_DEVCTL ), &control );
        control |= PCI_EXP_DEVCTL_FLR;
        pci_write_config_word ( pci, ( exp + PCI_EXP_DEVCTL ), control );

        /* Allow time for reset to complete */
        mdelay ( PCI_EXP_FLR_DELAY_MS );

        /* Restore configuration */
        pci_restore ( pci, &backup, PCI_CONFIG_BACKUP_STANDARD, NULL );
}

References control, mdelay(), NULL, pci_backup(), PCI_CONFIG_BACKUP_STANDARD, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_FLR, PCI_EXP_FLR_DELAY_MS, pci_read_config_word(), pci_restore(), and pci_write_config_word().

Referenced by ice_probe(), ice_remove(), intelxl_probe(), intelxl_remove(), intelxlvf_probe(), and intelxlvf_remove().