#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 */