pci.h
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上传日期:2013-04-10
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文件大小:10k
- #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
- /* [soapbox on]
- ** Who the hell can develop stuff without ASSERT or VASSERT?
- ** No one understands all the modules across all platforms.
- ** For linux add another dimension - processor architectures.
- **
- ** This should be a standard/global macro used liberally
- ** in all code. Every respectable engineer I know in HP
- ** would support this argument. - grant
- ** [soapbox off]
- */
- #ifdef PCI_DEBUG
- #define ASSERT(expr)
- if(!(expr)) {
- printk( "n" __FILE__ ":%d: Assertion " #expr " failed!n",__LINE__);
- panic(#expr);
- }
- #else
- #define ASSERT(expr)
- #endif
- /*
- ** 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
- ** dev->sysdata structure. I've heard this called "C inheritance" too.
- **
- ** Data needed by pcibios layer belongs here.
- */
- struct pci_hba_data {
- unsigned long 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 */
- unsigned long lmmio_space_offset; /* CPU view - PCI view */
- void * iommu; /* IOMMU this device is under */
- /* REVISIT - spinlock to protect resources? */
- };
- #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))
- /*
- ** Convert between PCI (IO_VIEW) addresses and processor (PA_VIEW) addresses.
- ** Note that we currently support only LMMIO.
- */
- #define PCI_BUS_ADDR(hba,a) ((a) - hba->lmmio_space_offset)
- #define PCI_HOST_ADDR(hba,a) ((a) + hba->lmmio_space_offset)
- /*
- ** 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;
- /*
- ** 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 reccomend 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);
- };
- /*
- ** See Documentation/DMA-mapping.txt
- */
- struct pci_dma_ops {
- int (*dma_supported)(struct pci_dev *dev, u64 mask);
- void *(*alloc_consistent)(struct pci_dev *dev, size_t size, dma_addr_t *iova);
- void (*free_consistent)(struct pci_dev *dev, size_t size, void *vaddr, dma_addr_t iova);
- dma_addr_t (*map_single)(struct pci_dev *dev, void *addr, size_t size, int direction);
- void (*unmap_single)(struct pci_dev *dev, dma_addr_t iova, size_t size, int direction);
- int (*map_sg)(struct pci_dev *dev, struct scatterlist *sg, int nents, int direction);
- void (*unmap_sg)(struct pci_dev *dev, struct scatterlist *sg, int nhwents, int direction);
- void (*dma_sync_single)(struct pci_dev *dev, dma_addr_t iova, size_t size, int direction);
- void (*dma_sync_sg)(struct pci_dev *dev, struct scatterlist *sg, int nelems, int direction);
- };
- /*
- ** We could live without the hppa_dma_ops indirection if we didn't want
- ** to support 4 different coherent dma models with one binary (they will
- ** someday be loadable modules):
- ** I/O MMU consistent method dma_sync behavior
- ** ============= ====================== =======================
- ** a) PA-7x00LC uncachable host memory flush/purge
- ** b) U2/Uturn cachable host memory NOP
- ** c) Ike/Astro cachable host memory NOP
- ** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
- **
- ** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
- **
- ** Systems (eg PCX-T workstations) that don't fall into the above
- ** categories will need to modify the needed drivers to perform
- ** flush/purge and allocate "regular" cacheable pages for everything.
- */
- extern struct pci_dma_ops *hppa_dma_ops;
- #ifdef CONFIG_PA11
- extern struct pci_dma_ops pcxl_dma_ops;
- extern struct pci_dma_ops pcx_dma_ops;
- #endif
- /*
- ** Oops hard if we haven't setup hppa_dma_ops by the time the first driver
- ** attempts to initialize.
- ** Since panic() is a (void)(), pci_dma_panic() is needed to satisfy
- ** the (int)() required by pci_dma_supported() interface.
- */
- static inline int pci_dma_panic(char *msg)
- {
- extern void panic(const char *, ...); /* linux/kernel.h */
- panic(msg);
- /* NOTREACHED */
- return -1;
- }
- #define pci_dma_supported(p, m) (
- (NULL == hppa_dma_ops)
- ? pci_dma_panic("Dynamic DMA support missing...OOPS!n(Hint: was Astro/Ike/U2/Uturn not claimed?)n")
- : hppa_dma_ops->dma_supported(p,m)
- )
- #define pci_alloc_consistent(p, s, a) hppa_dma_ops->alloc_consistent(p,s,a)
- #define pci_free_consistent(p, s, v, a) hppa_dma_ops->free_consistent(p,s,v,a)
- #define pci_map_single(p, v, s, d) hppa_dma_ops->map_single(p, v, s, d)
- #define pci_unmap_single(p, a, s, d) hppa_dma_ops->unmap_single(p, a, s, d)
- #define pci_map_sg(p, sg, n, d) hppa_dma_ops->map_sg(p, sg, n, d)
- #define pci_unmap_sg(p, sg, n, d) hppa_dma_ops->unmap_sg(p, sg, n, d)
- /* pci_unmap_{single,page} is not a nop, thus... */
- #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
- dma_addr_t ADDR_NAME;
- #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
- __u32 LEN_NAME;
- #define pci_unmap_addr(PTR, ADDR_NAME)
- ((PTR)->ADDR_NAME)
- #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)
- (((PTR)->ADDR_NAME) = (VAL))
- #define pci_unmap_len(PTR, LEN_NAME)
- ((PTR)->LEN_NAME)
- #define pci_unmap_len_set(PTR, LEN_NAME, VAL)
- (((PTR)->LEN_NAME) = (VAL))
- /* For U2/Astro/Ike based platforms (which are fully I/O coherent)
- ** dma_sync is a NOP. Let's keep the performance path short here.
- */
- #define pci_dma_sync_single(p, a, s, d) { if (hppa_dma_ops->dma_sync_single)
- hppa_dma_ops->dma_sync_single(p, a, s, d);
- }
- #define pci_dma_sync_sg(p, sg, n, d) { if (hppa_dma_ops->dma_sync_sg)
- hppa_dma_ops->dma_sync_sg(p, sg, n, d);
- }
- /* No highmem on parisc, plus we have an IOMMU, so mapping pages is easy. */
- #define pci_map_page(dev, page, off, size, dir)
- pci_map_single(dev, (page_address(page) + (off)), size, dir)
- #define pci_unmap_page(dev,addr,sz,dir) pci_unmap_single(dev,addr,sz,dir)
- /* Don't support DAC yet. */
- #define pci_dac_dma_supported(pci_dev, mask) (0)
- /*
- ** Stuff declared in arch/parisc/kernel/pci.c
- */
- extern struct pci_port_ops *pci_port;
- extern struct pci_bios_ops *pci_bios;
- extern int pci_post_reset_delay; /* delay after de-asserting #RESET */
- extern int pci_hba_count;
- extern struct pci_hba_data *parisc_pci_hba[];
- #ifdef CONFIG_PCI
- extern void pcibios_register_hba(struct pci_hba_data *);
- extern void pcibios_set_master(struct pci_dev *);
- extern void pcibios_assign_unassigned_resources(struct pci_bus *);
- #else
- extern inline void pcibios_register_hba(struct pci_hba_data *x)
- {
- }
- #endif
- /*
- ** used by 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.
- **
- ** REVISIT:
- ** To date, only alpha sets this to one. We'll need to set this
- ** to zero for legacy platforms and one for PAT platforms.
- */
- #define pcibios_assign_all_busses() (pdc_type == PDC_TYPE_PAT)
- #define PCIBIOS_MIN_IO 0x10
- #define PCIBIOS_MIN_MEM 0x1000 /* NBPG - but pci/setup-res.c dies */
- /* Return the index of the PCI controller for device PDEV. */
- #define pci_controller_num(PDEV) (0)
- #define GET_IOC(dev) ((struct ioc *)(HBA_DATA(dev->sysdata)->iommu))
- #ifdef CONFIG_IOMMU_CCIO
- struct parisc_device;
- struct ioc;
- void * ccio_get_iommu(const struct parisc_device *dev);
- struct pci_dev * ccio_get_fake(const struct parisc_device *dev);
- int ccio_request_resource(const struct parisc_device *dev,
- struct resource *res);
- int ccio_allocate_resource(const struct parisc_device *dev,
- struct resource *res, unsigned long size,
- unsigned long min, unsigned long max, unsigned long align,
- void (*alignf)(void *, struct resource *, unsigned long),
- void *alignf_data);
- #else /* !CONFIG_IOMMU_CCIO */
- #define ccio_get_iommu(dev) NULL
- #define ccio_get_fake(dev) NULL
- #define ccio_request_resource(dev, res) request_resource(&iomem_resource, res)
- #define ccio_allocate_resource(dev, res, size, min, max, align, alignf, data)
- allocate_resource(&iomem_resource, res, size, min, max,
- align, alignf, data)
- #endif /* !CONFIG_IOMMU_CCIO */
- #ifdef CONFIG_IOMMU_SBA
- struct parisc_device;
- void * sba_get_iommu(struct parisc_device *dev);
- #endif
- #endif /* __ASM_PARISC_PCI_H */