pci.h

 * pci_bus_read_config() - Read a configuration value from a device
 *
 * TODO(sjg@chromium.org): We should be able to pass just a device and have
 * it do the right thing. It would be good to have that function also.
 *
 * @bus:	Bus to read from
 * @bdf:	PCI device address: bus, device and function -see PCI_BDF()
 * @valuep:	Place to put the returned value
 * @size:	Access size
 * @return 0 if OK, -ve on error
 */
int pci_bus_read_config(struct udevice *bus, pci_dev_t bdf, int offset,
			unsigned long *valuep, enum pci_size_t size);

/**
 * pci_bus_write_config() - Write a configuration value to a device
 *
 * @bus:	Bus to write from
 * @bdf:	PCI device address: bus, device and function -see PCI_BDF()
 * @value:	Value to write
 * @size:	Access size
 * @return 0 if OK, -ve on error
 */
int pci_bus_write_config(struct udevice *bus, pci_dev_t bdf, int offset,
			 unsigned long value, enum pci_size_t size);

/**
 * Driver model PCI config access functions. Use these in preference to others
 * when you have a valid device
 */
int dm_pci_read_config(struct udevice *dev, int offset, unsigned long *valuep,
		       enum pci_size_t size);

int dm_pci_read_config8(struct udevice *dev, int offset, u8 *valuep);
int dm_pci_read_config16(struct udevice *dev, int offset, u16 *valuep);
int dm_pci_read_config32(struct udevice *dev, int offset, u32 *valuep);

int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
			enum pci_size_t size);

int dm_pci_write_config8(struct udevice *dev, int offset, u8 value);
int dm_pci_write_config16(struct udevice *dev, int offset, u16 value);
int dm_pci_write_config32(struct udevice *dev, int offset, u32 value);

/*
 * The following functions provide access to the above without needing the
 * size parameter. We are trying to encourage the use of the 8/16/32-style
 * functions, rather than byte/word/dword. But both are supported.
 */
int pci_write_config32(pci_dev_t pcidev, int offset, u32 value);

#ifdef CONFIG_DM_PCI_COMPAT
/* Compatibility with old naming */
static inline int pci_write_config_dword(pci_dev_t pcidev, int offset,
					 u32 value)
{
	return pci_write_config32(pcidev, offset, value);
}

int pci_write_config16(pci_dev_t pcidev, int offset, u16 value);

/* Compatibility with old naming */
static inline int pci_write_config_word(pci_dev_t pcidev, int offset,
					u16 value)
{
	return pci_write_config16(pcidev, offset, value);
}

int pci_write_config8(pci_dev_t pcidev, int offset, u8 value);

/* Compatibility with old naming */
static inline int pci_write_config_byte(pci_dev_t pcidev, int offset,
					u8 value)
{
	return pci_write_config8(pcidev, offset, value);
}

int pci_read_config32(pci_dev_t pcidev, int offset, u32 *valuep);

/* Compatibility with old naming */
static inline int pci_read_config_dword(pci_dev_t pcidev, int offset,
					u32 *valuep)
{
	return pci_read_config32(pcidev, offset, valuep);
}

int pci_read_config16(pci_dev_t pcidev, int offset, u16 *valuep);

/* Compatibility with old naming */
static inline int pci_read_config_word(pci_dev_t pcidev, int offset,
				       u16 *valuep)
{
	return pci_read_config16(pcidev, offset, valuep);
}

int pci_read_config8(pci_dev_t pcidev, int offset, u8 *valuep);

/* Compatibility with old naming */
static inline int pci_read_config_byte(pci_dev_t pcidev, int offset,
				       u8 *valuep)
{
	return pci_read_config8(pcidev, offset, valuep);
}

#endif /* CONFIG_DM_PCI_COMPAT */

/**
 * dm_pciauto_config_device() - configure a device ready for use
 *
 * Space is allocated for each PCI base address register (BAR) so that the
 * devices are mapped into memory and I/O space ready for use.
 *
 * @dev:	Device to configure
 * @return 0 if OK, -ve on error
 */
int dm_pciauto_config_device(struct udevice *dev);

/**
 * pci_conv_32_to_size() - convert a 32-bit read value to the given size
 *
 * Some PCI buses must always perform 32-bit reads. The data must then be
 * shifted and masked to reflect the required access size and offset. This
 * function performs this transformation.
 *
 * @value:	Value to transform (32-bit value read from @offset & ~3)
 * @offset:	Register offset that was read
 * @size:	Required size of the result
 * @return the value that would have been obtained if the read had been
 * performed at the given offset with the correct size
 */
ulong pci_conv_32_to_size(ulong value, uint offset, enum pci_size_t size);

/**
 * pci_conv_size_to_32() - update a 32-bit value to prepare for a write
 *
 * Some PCI buses must always perform 32-bit writes. To emulate a smaller
 * write the old 32-bit data must be read, updated with the required new data
 * and written back as a 32-bit value. This function performs the
 * transformation from the old value to the new value.
 *
 * @value:	Value to transform (32-bit value read from @offset & ~3)
 * @offset:	Register offset that should be written
 * @size:	Required size of the write
 * @return the value that should be written as a 32-bit access to @offset & ~3.
 */
ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
			  enum pci_size_t size);

/**
 * pci_get_controller() - obtain the controller to use for a bus
 *
 * @dev:	Device to check
 * @return pointer to the controller device for this bus
 */
struct udevice *pci_get_controller(struct udevice *dev);

/**
 * pci_get_regions() - obtain pointers to all the region types
 *
 * @dev:	Device to check
 * @iop:	Returns a pointer to the I/O region, or NULL if none
 * @memp:	Returns a pointer to the memory region, or NULL if none
 * @prefp:	Returns a pointer to the pre-fetch region, or NULL if none
 * @return the number of non-NULL regions returned, normally 3
 */
int pci_get_regions(struct udevice *dev, struct pci_region **iop,
		    struct pci_region **memp, struct pci_region **prefp);

/**
 * dm_pci_find_device() - find a device by vendor/device ID
 *
 * @vendor:	Vendor ID
 * @device:	Device ID
 * @index:	0 to find the first match, 1 for second, etc.
 * @devp:	Returns pointer to the device, if found
 * @return 0 if found, -ve on error
 */
int dm_pci_find_device(unsigned int vendor, unsigned int device, int index,
		       struct udevice **devp);

/**
 * dm_pci_find_class() - find a device by class
 *
 * @find_class: 3-byte (24-bit) class value to find
 * @index:	0 to find the first match, 1 for second, etc.
 * @devp:	Returns pointer to the device, if found
 * @return 0 if found, -ve on error
 */
int dm_pci_find_class(uint find_class, int index, struct udevice **devp);

/**
 * struct dm_pci_emul_ops - PCI device emulator operations
 */
struct dm_pci_emul_ops {
	/**
	 * get_devfn(): Check which device and function this emulators
	 *
	 * @dev:	device to check
	 * @return the device and function this emulates, or -ve on error
	 */
	int (*get_devfn)(struct udevice *dev);
	/**
	 * read_config() - Read a PCI configuration value
	 *
	 * @dev:	Emulated device to read from
	 * @offset:	Byte offset within the device's configuration space
	 * @valuep:	Place to put the returned value
	 * @size:	Access size
	 * @return 0 if OK, -ve on error
	 */
	int (*read_config)(struct udevice *dev, uint offset, ulong *valuep,
			   enum pci_size_t size);
	/**
	 * write_config() - Write a PCI configuration value
	 *
	 * @dev:	Emulated device to write to
	 * @offset:	Byte offset within the device's configuration space
	 * @value:	Value to write
	 * @size:	Access size
	 * @return 0 if OK, -ve on error
	 */
	int (*write_config)(struct udevice *dev, uint offset, ulong value,
			    enum pci_size_t size);
	/**
	 * read_io() - Read a PCI I/O value
	 *
	 * @dev:	Emulated device to read from
	 * @addr:	I/O address to read
	 * @valuep:	Place to put the returned value
	 * @size:	Access size
	 * @return 0 if OK, -ENOENT if @addr is not mapped by this device,
	 *		other -ve value on error
	 */
	int (*read_io)(struct udevice *dev, unsigned int addr, ulong *valuep,
		       enum pci_size_t size);
	/**
	 * write_io() - Write a PCI I/O value
	 *
	 * @dev:	Emulated device to write from
	 * @addr:	I/O address to write
	 * @value:	Value to write
	 * @size:	Access size
	 * @return 0 if OK, -ENOENT if @addr is not mapped by this device,
	 *		other -ve value on error
	 */
	int (*write_io)(struct udevice *dev, unsigned int addr,
			ulong value, enum pci_size_t size);
	/**
	 * map_physmem() - Map a device into sandbox memory
	 *
	 * @dev:	Emulated device to map
	 * @addr:	Memory address, normally corresponding to a PCI BAR.
	 *		The device should have been configured to have a BAR
	 *		at this address.
	 * @lenp:	On entry, the size of the area to map, On exit it is
	 *		updated to the size actually mapped, which may be less
	 *		if the device has less space
	 * @ptrp:	Returns a pointer to the mapped address. The device's
	 *		space can be accessed as @lenp bytes starting here
	 * @return 0 if OK, -ENOENT if @addr is not mapped by this device,
	 *		other -ve value on error
	 */
	int (*map_physmem)(struct udevice *dev, phys_addr_t addr,
			   unsigned long *lenp, void **ptrp);
	/**
	 * unmap_physmem() - undo a memory mapping
	 *
	 * This must be called after map_physmem() to undo the mapping.
	 * Some devices can use this to check what has been written into
	 * their mapped memory and perform an operations they require on it.
	 * In this way, map/unmap can be used as a sort of handshake between
	 * the emulated device and its users.
	 *
	 * @dev:	Emuated device to unmap
	 * @vaddr:	Mapped memory address, as passed to map_physmem()
	 * @len:	Size of area mapped, as returned by map_physmem()
	 * @return 0 if OK, -ve on error
	 */
	int (*unmap_physmem)(struct udevice *dev, const void *vaddr,
			     unsigned long len);
};

/* Get access to a PCI device emulator's operations */
#define pci_get_emul_ops(dev)	((struct dm_pci_emul_ops *)(dev)->driver->ops)

/**
 * sandbox_pci_get_emul() - Get the emulation device for a PCI device
 *
 * Searches for a suitable emulator for the given PCI bus device
 *
 * @bus:	PCI bus to search
 * @find_devfn:	PCI device and function address (PCI_DEVFN())
 * @emulp:	Returns emulated device if found
 * @return 0 if found, -ENODEV if not found
 */
int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
			 struct udevice **emulp);

#endif /* CONFIG_DM_PCI */

/**
 * PCI_DEVICE - macro used to describe a specific pci device
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific device.  The subvendor and subdevice fields will be set to
 * PCI_ANY_ID.
 */
#define PCI_DEVICE(vend, dev) \
	.vendor = (vend), .device = (dev), \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID

/**
 * PCI_DEVICE_SUB - macro used to describe a specific pci device with subsystem
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 * @subvend: the 16 bit PCI Subvendor ID
 * @subdev: the 16 bit PCI Subdevice ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific device with subsystem information.
 */
#define PCI_DEVICE_SUB(vend, dev, subvend, subdev) \
	.vendor = (vend), .device = (dev), \
	.subvendor = (subvend), .subdevice = (subdev)

/**
 * PCI_DEVICE_CLASS - macro used to describe a specific pci device class
 * @dev_class: the class, subclass, prog-if triple for this device
 * @dev_class_mask: the class mask for this device
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific PCI class.  The vendor, device, subvendor, and subdevice
 * fields will be set to PCI_ANY_ID.
 */
#define PCI_DEVICE_CLASS(dev_class, dev_class_mask) \
	.class = (dev_class), .class_mask = (dev_class_mask), \
	.vendor = PCI_ANY_ID, .device = PCI_ANY_ID, \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID

/**
 * PCI_VDEVICE - macro used to describe a specific pci device in short form
 * @vend: the vendor name
 * @dev: the 16 bit PCI Device ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific PCI device.  The subvendor, and subdevice fields will be set
 * to PCI_ANY_ID. The macro allows the next field to follow as the device
 * private data.
 */

#define PCI_VDEVICE(vend, dev) \
	.vendor = PCI_VENDOR_ID_##vend, .device = (dev), \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, 0, 0

/**
 * struct pci_driver_entry - Matches a driver to its pci_device_id list
 * @driver: Driver to use
 * @match: List of match records for this driver, terminated by {}
 */
struct pci_driver_entry {
	struct driver *driver;
	const struct pci_device_id *match;
};

#define U_BOOT_PCI_DEVICE(__name, __match)				\
	ll_entry_declare(struct pci_driver_entry, __name, pci_driver_entry) = {\
		.driver = llsym(struct driver, __name, driver), \
		.match = __match, \
		}

#endif /* __ASSEMBLY__ */
#endif /* _PCI_H */