arch/parisc/include/asm/pci.h - kernel/skids - Git at Google

 #ifndef __ASM_PARISC_PCI_H
 #define __ASM_PARISC_PCI_H

 #include <asm/scatterlist.h>


 /*
 ** HP PCI platforms generally support multiple bus adapters.
 **    (workstations 1-~4, servers 2-~32)
 **
 ** Newer platforms number the busses across PCI bus adapters *sparsely*.
 ** E.g. 0, 8, 16, ...
 **
 ** Under a PCI bus, most HP platforms support PPBs up to two or three
 ** levels deep. See "Bit3" product line.
 */
 #define PCI_MAX_BUSSES	256


 /* To be used as: mdelay(pci_post_reset_delay);
  *
  * post_reset is the time the kernel should stall to prevent anyone from
  * accessing the PCI bus once #RESET is de-asserted.
  * PCI spec somewhere says 1 second but with multi-PCI bus systems,
  * this makes the boot time much longer than necessary.
  * 20ms seems to work for all the HP PCI implementations to date.
  */
 #define pci_post_reset_delay 50


 /*
 ** pci_hba_data (aka H2P_OBJECT in HP/UX)
 **
 ** This is the "common" or "base" data structure which HBA drivers
 ** (eg Dino or LBA) are required to place at the top of their own
 ** platform_data structure.  I've heard this called "C inheritance" too.
 **
 ** Data needed by pcibios layer belongs here.
 */
 struct pci_hba_data {
 	void __iomem   *base_addr;	/* aka Host Physical Address */
 	const struct parisc_device *dev; /* device from PA bus walk */
 	struct pci_bus *hba_bus;	/* primary PCI bus below HBA */
 	int		hba_num;	/* I/O port space access "key" */
 	struct resource bus_num;	/* PCI bus numbers */
 	struct resource io_space;	/* PIOP */
 	struct resource lmmio_space;	/* bus addresses < 4Gb */
 	struct resource elmmio_space;	/* additional bus addresses < 4Gb */
 	struct resource gmmio_space;	/* bus addresses > 4Gb */

 	/* NOTE: Dino code assumes it can use *all* of the lmmio_space,
 	 * elmmio_space and gmmio_space as a contiguous array of
 	 * resources.  This #define represents the array size */
 	#define DINO_MAX_LMMIO_RESOURCES	3

 	unsigned long   lmmio_space_offset;  /* CPU view - PCI view */
 	void *          iommu;          /* IOMMU this device is under */
 	/* REVISIT - spinlock to protect resources? */

 	#define HBA_NAME_SIZE 16
 	char io_name[HBA_NAME_SIZE];
 	char lmmio_name[HBA_NAME_SIZE];
 	char elmmio_name[HBA_NAME_SIZE];
 	char gmmio_name[HBA_NAME_SIZE];
 };

 #define HBA_DATA(d)		((struct pci_hba_data *) (d))

 /*
 ** We support 2^16 I/O ports per HBA.  These are set up in the form
 ** 0xbbxxxx, where bb is the bus number and xxxx is the I/O port
 ** space address.
 */
 #define HBA_PORT_SPACE_BITS	16

 #define HBA_PORT_BASE(h)	((h) << HBA_PORT_SPACE_BITS)
 #define HBA_PORT_SPACE_SIZE	(1UL << HBA_PORT_SPACE_BITS)

 #define PCI_PORT_HBA(a)		((a) >> HBA_PORT_SPACE_BITS)
 #define PCI_PORT_ADDR(a)	((a) & (HBA_PORT_SPACE_SIZE - 1))

 #ifdef CONFIG_64BIT
 #define PCI_F_EXTEND		0xffffffff00000000UL
 #define PCI_IS_LMMIO(hba,a)	pci_is_lmmio(hba,a)

 /* We need to know if an address is LMMMIO or GMMIO.
  * LMMIO requires mangling and GMMIO we must use as-is.
  */
 static __inline__  int pci_is_lmmio(struct pci_hba_data *hba, unsigned long a)
 {
 	return(((a) & PCI_F_EXTEND) == PCI_F_EXTEND);
 }

 /*
 ** Convert between PCI (IO_VIEW) addresses and processor (PA_VIEW) addresses.
 ** See pci.c for more conversions used by Generic PCI code.
 **
 ** Platform characteristics/firmware guarantee that
 **	(1) PA_VIEW - IO_VIEW = lmmio_offset for both LMMIO and ELMMIO
 **	(2) PA_VIEW == IO_VIEW for GMMIO
 */
 #define PCI_BUS_ADDR(hba,a)	(PCI_IS_LMMIO(hba,a)	\
 		?  ((a) - hba->lmmio_space_offset)	/* mangle LMMIO */ \
 		: (a))					/* GMMIO */
 #define PCI_HOST_ADDR(hba,a)	(((a) & PCI_F_EXTEND) == 0 \
 		? (a) + hba->lmmio_space_offset \
 		: (a))

 #else	/* !CONFIG_64BIT */

 #define PCI_BUS_ADDR(hba,a)	(a)
 #define PCI_HOST_ADDR(hba,a)	(a)
 #define PCI_F_EXTEND		0UL
 #define PCI_IS_LMMIO(hba,a)	(1)	/* 32-bit doesn't support GMMIO */

 #endif /* !CONFIG_64BIT */

 /*
 ** KLUGE: linux/pci.h include asm/pci.h BEFORE declaring struct pci_bus
 ** (This eliminates some of the warnings).
 */
 struct pci_bus;
 struct pci_dev;

 /*
  * If the PCI device's view of memory is the same as the CPU's view of memory,
  * PCI_DMA_BUS_IS_PHYS is true.  The networking and block device layers use
  * this boolean for bounce buffer decisions.
  */
 #ifdef CONFIG_PA20
 /* All PA-2.0 machines have an IOMMU. */
 #define PCI_DMA_BUS_IS_PHYS	0
 #define parisc_has_iommu()	do { } while (0)
 #else

 #if defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA)
 extern int parisc_bus_is_phys; 	/* in arch/parisc/kernel/setup.c */
 #define PCI_DMA_BUS_IS_PHYS	parisc_bus_is_phys
 #define parisc_has_iommu()	do { parisc_bus_is_phys = 0; } while (0)
 #else
 #define PCI_DMA_BUS_IS_PHYS	1
 #define parisc_has_iommu()	do { } while (0)
 #endif

 #endif	/* !CONFIG_PA20 */


 /*
 ** Most PCI devices (eg Tulip, NCR720) also export the same registers
 ** to both MMIO and I/O port space.  Due to poor performance of I/O Port
 ** access under HP PCI bus adapters, strongly recommend the use of MMIO
 ** address space.
 **
 ** While I'm at it more PA programming notes:
 **
 ** 1) MMIO stores (writes) are posted operations. This means the processor
 **    gets an "ACK" before the write actually gets to the device. A read
 **    to the same device (or typically the bus adapter above it) will
 **    force in-flight write transaction(s) out to the targeted device
 **    before the read can complete.
 **
 ** 2) The Programmed I/O (PIO) data may not always be strongly ordered with
 **    respect to DMA on all platforms. Ie PIO data can reach the processor
 **    before in-flight DMA reaches memory. Since most SMP PA platforms
 **    are I/O coherent, it generally doesn't matter...but sometimes
 **    it does.
 **
 ** I've helped device driver writers debug both types of problems.
 */
 struct pci_port_ops {
 	  u8 (*inb)  (struct pci_hba_data *hba, u16 port);
 	 u16 (*inw)  (struct pci_hba_data *hba, u16 port);
 	 u32 (*inl)  (struct pci_hba_data *hba, u16 port);
 	void (*outb) (struct pci_hba_data *hba, u16 port,  u8 data);
 	void (*outw) (struct pci_hba_data *hba, u16 port, u16 data);
 	void (*outl) (struct pci_hba_data *hba, u16 port, u32 data);
 };


 struct pci_bios_ops {
 	void (*init)(void);
 	void (*fixup_bus)(struct pci_bus *bus);
 };

 /*
 ** Stuff declared in arch/parisc/kernel/pci.c
 */
 extern struct pci_port_ops *pci_port;
 extern struct pci_bios_ops *pci_bios;

 #ifdef CONFIG_PCI
 extern void pcibios_register_hba(struct pci_hba_data *);
 extern void pcibios_set_master(struct pci_dev *);
 #else
 static inline void pcibios_register_hba(struct pci_hba_data *x)
 {
 }
 #endif

 /*
  * pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()
  *   0 == check if bridge is numbered before re-numbering.
  *   1 == pci_do_scan_bus() should automatically number all PCI-PCI bridges.
  *
  *   We *should* set this to zero for "legacy" platforms and one
  *   for PAT platforms.
  *
  *   But legacy platforms also need to renumber the busses below a Host
  *   Bus controller.  Adding a 4-port Tulip card on the first PCI root
  *   bus of a C200 resulted in the secondary bus being numbered as 1.
  *   The second PCI host bus controller's root bus had already been
  *   assigned bus number 1 by firmware and sysfs complained.
  *
  *   Firmware isn't doing anything wrong here since each controller
  *   is its own PCI domain.  It's simpler and easier for us to renumber
  *   the busses rather than treat each Dino as a separate PCI domain.
  *   Eventually, we may want to introduce PCI domains for Superdome or
  *   rp7420/8420 boxes and then revisit this issue.
  */
 #define pcibios_assign_all_busses()     (1)

 #define PCIBIOS_MIN_IO          0x10
 #define PCIBIOS_MIN_MEM         0x1000 /* NBPG - but pci/setup-res.c dies */

 /* export the pci_ DMA API in terms of the dma_ one */
 #include <asm-generic/pci-dma-compat.h>

 #ifdef CONFIG_PCI
 static inline void pci_dma_burst_advice(struct pci_dev *pdev,
 					enum pci_dma_burst_strategy *strat,
 					unsigned long *strategy_parameter)
 {
 	unsigned long cacheline_size;
 	u8 byte;

 	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
 	if (byte == 0)
 		cacheline_size = 1024;
 	else
 		cacheline_size = (int) byte * 4;

 	*strat = PCI_DMA_BURST_MULTIPLE;
 	*strategy_parameter = cacheline_size;
 }
 #endif

 extern void
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			 struct resource *res);

 extern void
 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 			struct pci_bus_region *region);

 static inline void pcibios_penalize_isa_irq(int irq, int active)
 {
 	/* We don't need to penalize isa irq's */
 }

 static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 {
 	return channel ? 15 : 14;
 }

 #endif /* __ASM_PARISC_PCI_H */
	#ifndef __ASM_PARISC_PCI_H
	#define __ASM_PARISC_PCI_H

	#include <asm/scatterlist.h>



	/*
	** HP PCI platforms generally support multiple bus adapters.
	** (workstations 1-~4, servers 2-~32)
	**
	** Newer platforms number the busses across PCI bus adapters sparsely.
	** E.g. 0, 8, 16, ...
	**
	** Under a PCI bus, most HP platforms support PPBs up to two or three
	** levels deep. See "Bit3" product line.
	*/
	#define PCI_MAX_BUSSES 256


	/* To be used as: mdelay(pci_post_reset_delay);
	*
	* post_reset is the time the kernel should stall to prevent anyone from
	* accessing the PCI bus once #RESET is de-asserted.
	* PCI spec somewhere says 1 second but with multi-PCI bus systems,
	* this makes the boot time much longer than necessary.
	* 20ms seems to work for all the HP PCI implementations to date.
	*/
	#define pci_post_reset_delay 50


	/*
	** pci_hba_data (aka H2P_OBJECT in HP/UX)
	**
	** This is the "common" or "base" data structure which HBA drivers
	** (eg Dino or LBA) are required to place at the top of their own
	** platform_data structure. I've heard this called "C inheritance" too.
	**
	** Data needed by pcibios layer belongs here.
	*/
	struct pci_hba_data {
	void __iomem base_addr; / aka Host Physical Address */
	const struct parisc_device dev; / device from PA bus walk */
	struct pci_bus hba_bus; / primary PCI bus below HBA */
	int hba_num; /* I/O port space access "key" */
	struct resource bus_num; /* PCI bus numbers */
	struct resource io_space; /* PIOP */
	struct resource lmmio_space; /* bus addresses < 4Gb */
	struct resource elmmio_space; /* additional bus addresses < 4Gb */
	struct resource gmmio_space; /* bus addresses > 4Gb */

	/* NOTE: Dino code assumes it can use all of the lmmio_space,
	* elmmio_space and gmmio_space as a contiguous array of
	* resources. This #define represents the array size */
	#define DINO_MAX_LMMIO_RESOURCES 3

	unsigned long lmmio_space_offset; /* CPU view - PCI view */
	void * iommu; /* IOMMU this device is under */
	/* REVISIT - spinlock to protect resources? */

	#define HBA_NAME_SIZE 16
	char io_name[HBA_NAME_SIZE];
	char lmmio_name[HBA_NAME_SIZE];
	char elmmio_name[HBA_NAME_SIZE];
	char gmmio_name[HBA_NAME_SIZE];
	};

	#define HBA_DATA(d) ((struct pci_hba_data *) (d))

	/*
	** We support 2^16 I/O ports per HBA. These are set up in the form
	** 0xbbxxxx, where bb is the bus number and xxxx is the I/O port
	** space address.
	*/
	#define HBA_PORT_SPACE_BITS 16

	#define HBA_PORT_BASE(h) ((h) << HBA_PORT_SPACE_BITS)
	#define HBA_PORT_SPACE_SIZE (1UL << HBA_PORT_SPACE_BITS)

	#define PCI_PORT_HBA(a) ((a) >> HBA_PORT_SPACE_BITS)
	#define PCI_PORT_ADDR(a) ((a) & (HBA_PORT_SPACE_SIZE - 1))

	#ifdef CONFIG_64BIT
	#define PCI_F_EXTEND 0xffffffff00000000UL
	#define PCI_IS_LMMIO(hba,a) pci_is_lmmio(hba,a)

	/* We need to know if an address is LMMMIO or GMMIO.
	* LMMIO requires mangling and GMMIO we must use as-is.
	*/
	static __inline__ int pci_is_lmmio(struct pci_hba_data *hba, unsigned long a)
	{
	return(((a) & PCI_F_EXTEND) == PCI_F_EXTEND);
	}

	/*
	** Convert between PCI (IO_VIEW) addresses and processor (PA_VIEW) addresses.
	** See pci.c for more conversions used by Generic PCI code.
	**
	** Platform characteristics/firmware guarantee that
	** (1) PA_VIEW - IO_VIEW = lmmio_offset for both LMMIO and ELMMIO
	** (2) PA_VIEW == IO_VIEW for GMMIO
	*/
	#define PCI_BUS_ADDR(hba,a) (PCI_IS_LMMIO(hba,a) \
	? ((a) - hba->lmmio_space_offset) /* mangle LMMIO */ \
	: (a)) /* GMMIO */
	#define PCI_HOST_ADDR(hba,a) (((a) & PCI_F_EXTEND) == 0 \
	? (a) + hba->lmmio_space_offset \
	: (a))

	#else /* !CONFIG_64BIT */

	#define PCI_BUS_ADDR(hba,a) (a)
	#define PCI_HOST_ADDR(hba,a) (a)
	#define PCI_F_EXTEND 0UL
	#define PCI_IS_LMMIO(hba,a) (1) /* 32-bit doesn't support GMMIO */

	#endif /* !CONFIG_64BIT */

	/*
	** KLUGE: linux/pci.h include asm/pci.h BEFORE declaring struct pci_bus
	** (This eliminates some of the warnings).
	*/
	struct pci_bus;
	struct pci_dev;

	/*
	* If the PCI device's view of memory is the same as the CPU's view of memory,
	* PCI_DMA_BUS_IS_PHYS is true. The networking and block device layers use
	* this boolean for bounce buffer decisions.
	*/
	#ifdef CONFIG_PA20
	/* All PA-2.0 machines have an IOMMU. */
	#define PCI_DMA_BUS_IS_PHYS 0
	#define parisc_has_iommu() do { } while (0)
	#else

	#if defined(CONFIG_IOMMU_CCIO) \|\| defined(CONFIG_IOMMU_SBA)
	extern int parisc_bus_is_phys; /* in arch/parisc/kernel/setup.c */
	#define PCI_DMA_BUS_IS_PHYS parisc_bus_is_phys
	#define parisc_has_iommu() do { parisc_bus_is_phys = 0; } while (0)
	#else
	#define PCI_DMA_BUS_IS_PHYS 1
	#define parisc_has_iommu() do { } while (0)
	#endif

	#endif /* !CONFIG_PA20 */


	/*
	** Most PCI devices (eg Tulip, NCR720) also export the same registers
	** to both MMIO and I/O port space. Due to poor performance of I/O Port
	** access under HP PCI bus adapters, strongly recommend the use of MMIO
	** address space.
	**
	** While I'm at it more PA programming notes:
	**
	** 1) MMIO stores (writes) are posted operations. This means the processor
	** gets an "ACK" before the write actually gets to the device. A read
	** to the same device (or typically the bus adapter above it) will
	** force in-flight write transaction(s) out to the targeted device
	** before the read can complete.
	**
	** 2) The Programmed I/O (PIO) data may not always be strongly ordered with
	** respect to DMA on all platforms. Ie PIO data can reach the processor
	** before in-flight DMA reaches memory. Since most SMP PA platforms
	** are I/O coherent, it generally doesn't matter...but sometimes
	** it does.
	**
	** I've helped device driver writers debug both types of problems.
	*/
	struct pci_port_ops {
	u8 (inb) (struct pci_hba_data hba, u16 port);
	u16 (inw) (struct pci_hba_data hba, u16 port);
	u32 (inl) (struct pci_hba_data hba, u16 port);
	void (outb) (struct pci_hba_data hba, u16 port, u8 data);
	void (outw) (struct pci_hba_data hba, u16 port, u16 data);
	void (outl) (struct pci_hba_data hba, u16 port, u32 data);
	};


	struct pci_bios_ops {
	void (*init)(void);
	void (fixup_bus)(struct pci_bus bus);
	};

	/*
	** Stuff declared in arch/parisc/kernel/pci.c
	*/
	extern struct pci_port_ops *pci_port;
	extern struct pci_bios_ops *pci_bios;

	#ifdef CONFIG_PCI
	extern void pcibios_register_hba(struct pci_hba_data *);
	extern void pcibios_set_master(struct pci_dev *);
	#else
	static inline void pcibios_register_hba(struct pci_hba_data *x)
	{
	}
	#endif

	/*
	* pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()
	* 0 == check if bridge is numbered before re-numbering.
	* 1 == pci_do_scan_bus() should automatically number all PCI-PCI bridges.
	*
	* We should set this to zero for "legacy" platforms and one
	* for PAT platforms.
	*
	* But legacy platforms also need to renumber the busses below a Host
	* Bus controller. Adding a 4-port Tulip card on the first PCI root
	* bus of a C200 resulted in the secondary bus being numbered as 1.
	* The second PCI host bus controller's root bus had already been
	* assigned bus number 1 by firmware and sysfs complained.
	*
	* Firmware isn't doing anything wrong here since each controller
	* is its own PCI domain. It's simpler and easier for us to renumber
	* the busses rather than treat each Dino as a separate PCI domain.
	* Eventually, we may want to introduce PCI domains for Superdome or
	* rp7420/8420 boxes and then revisit this issue.
	*/
	#define pcibios_assign_all_busses() (1)

	#define PCIBIOS_MIN_IO 0x10
	#define PCIBIOS_MIN_MEM 0x1000 /* NBPG - but pci/setup-res.c dies */

	/* export the pci_ DMA API in terms of the dma_ one */
	#include <asm-generic/pci-dma-compat.h>

	#ifdef CONFIG_PCI
	static inline void pci_dma_burst_advice(struct pci_dev *pdev,
	enum pci_dma_burst_strategy *strat,
	unsigned long *strategy_parameter)
	{
	unsigned long cacheline_size;
	u8 byte;

	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
	if (byte == 0)
	cacheline_size = 1024;
	else
	cacheline_size = (int) byte * 4;

	*strat = PCI_DMA_BURST_MULTIPLE;
	*strategy_parameter = cacheline_size;
	}
	#endif

	extern void
	pcibios_resource_to_bus(struct pci_dev dev, struct pci_bus_region region,
	struct resource *res);

	extern void
	pcibios_bus_to_resource(struct pci_dev dev, struct resource res,
	struct pci_bus_region *region);

	static inline void pcibios_penalize_isa_irq(int irq, int active)
	{
	/* We don't need to penalize isa irq's */
	}

	static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
	{
	return channel ? 15 : 14;
	}

	#endif /* __ASM_PARISC_PCI_H */