165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/*
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* \brief PCI bus access
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* \author Christian Helmuth
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* \date 2008-10-01
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*
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* The DDE Kit provides virtual PCI bus hierarchy, which may be a subset of
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* the PCI bus with the same bus-device-function IDs.
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*/
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/*
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* Copyright (C) 2008-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__DDE_KIT__PCI_H_
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#define _INCLUDE__DDE_KIT__PCI_H_
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#include <dde_kit/types.h>
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/********************************
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** Configuration space access **
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********************************/
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/**
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* Read byte from PCI config space
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*
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* \param bus bus number
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* \param dev device number
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* \param fun function number
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* \param pos offset in config space
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*
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* \retval val read value
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*
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* \return 0 on success, -1 otherwise
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*/
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void dde_kit_pci_readb(int bus, int dev, int fun, int pos, dde_kit_uint8_t *val);
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/**
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* Read word from PCI config space
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*
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* \param bus bus number
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* \param dev device number
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* \param fun function number
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* \param pos offset in config space
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*
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* \retval val read value
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*
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* \return 0 on success, -1 otherwise
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*/
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void dde_kit_pci_readw(int bus, int dev, int fun, int pos, dde_kit_uint16_t *val);
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/**
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* Read dword from PCI config space
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*
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* \param bus bus number
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* \param dev device number
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* \param fun function number
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* \param pos offset in config space
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*
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* \retval val read value
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*
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* \return 0 on success, -1 otherwise
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*/
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void dde_kit_pci_readl(int bus, int dev, int fun, int pos, dde_kit_uint32_t *val);
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/**
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* Write byte to PCI config space
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*
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* \param bus bus number
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* \param dev device number
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* \param fun function number
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* \param pos offset in config space
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* \param val value to write
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*
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* \return 0 on success, -1 otherwise
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*/
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void dde_kit_pci_writeb(int bus, int dev, int fun, int pos, dde_kit_uint8_t val);
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/**
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* Write word to PCI config space
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*
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* \param bus bus number
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* \param dev device number
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* \param fun function number
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* \param pos offset in config space
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* \param val value to write
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*
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* \return 0 on success, -1 otherwise
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*/
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void dde_kit_pci_writew(int bus, int dev, int fun, int pos, dde_kit_uint16_t val);
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/**
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* Write dword to PCI config space.
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*
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* \param bus bus number
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* \param dev device number
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* \param fun function number
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* \param pos offset in config space
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* \param val value to write
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*
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* \return 0 on success, -1 otherwise
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*/
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void dde_kit_pci_writel(int bus, int dev, int fun, int pos, dde_kit_uint32_t val);
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/***************************
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** Convenience functions **
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***************************/
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/**
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* Find first PCI device on virtual bus tree
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*
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* \retval bus bus number
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* \retval dev device number
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* \retval fun function number
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*
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* \return 0 on success, -1 otherwise
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*/
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int dde_kit_pci_first_device(int *bus, int *dev, int *fun);
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/**
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* Find next PCI device
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*
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* \param bus bus number to start at
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* \param dev device number to start at
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* \param fun function number to start at
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*
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* \retval bus bus number
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* \retval dev device number
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* \retval fun function number
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*
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* \return 0 on success, -1 otherwise
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*/
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int dde_kit_pci_next_device(int *bus, int *dev, int *fun);
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/**
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* Initialize PCI subsystem
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*
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* The PCI subsystem can be instructed to request solely a specific PCI device
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* or a specific PCI subset (one class or multiple). The parameters are
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* described by the parameters device_class and class_mask, which are used to
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* filter PCI class codes as described by the pseudo code:
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*
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* for each 'pci_device' out of 'all_pci_devices' try
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* {
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* bool nohit = (pci_device.class_code() ^ device_class) & class_mask
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* if (!nohit)
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* use 'pci_device' with this PCI subsystem
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* }
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*
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* If no restriction to the PCI subsystem should be applied, use 0 for the
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* device_class and class_mask.
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*
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* \param device_class filter applied with 'bitwise XOR' operand to the class
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* code of each PCI device
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* \param class_mask filter applied with 'bitwise AND' operand to the result
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* out of device_class and PCI class code of each device
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*/
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void dde_kit_pci_init(unsigned device_class, unsigned class_mask);
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#endif /* _INCLUDE__DDE_KIT__PCI_H_ */
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