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#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 */
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 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 parisc_has_iommu() do { } while (0)
#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)
#define parisc_has_iommu() do { } while (0)
#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;
extern void pcibios_register_hba(struct pci_hba_data *);
extern void pcibios_set_master(struct pci_dev *);
static inline void pcibios_register_hba(struct pci_hba_data *x)
* 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>
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;
cacheline_size = (int) byte * 4;
*strategy_parameter = cacheline_size;
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 */