diff options
Diffstat (limited to 'arch/parisc/include/asm/pci.h')
| -rw-r--r-- | arch/parisc/include/asm/pci.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/pci.h b/arch/parisc/include/asm/pci.h new file mode 100644 index 000000000..127ed5021 --- /dev/null +++ b/arch/parisc/include/asm/pci.h @@ -0,0 +1,168 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_PARISC_PCI_H +#define __ASM_PARISC_PCI_H + +#include <linux/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 */ + struct ioc *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]; +}; + +/* +** 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 +#else /* !CONFIG_64BIT */ +#define PCI_F_EXTEND 0UL +#endif /* !CONFIG_64BIT */ + +/* +** 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 *); +#else +static inline void pcibios_register_hba(struct pci_hba_data *x) +{ +} +#endif +extern void pcibios_init_bridge(struct pci_dev *); + +/* + * 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 */ + +#define HAVE_PCI_MMAP +#define ARCH_GENERIC_PCI_MMAP_RESOURCE + +#endif /* __ASM_PARISC_PCI_H */ |