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396a1a5832
The powerpc version of pci_resource_to_user() and associated hooks used by /proc/bus/pci and /sys/bus/pci mmap have been broken for some time on machines that don't have a 1:1 mapping of devices (basically on non-PowerMacs) and have PCI devices above 32 bits. This attempts to fix it as well as possible. The rule is supposed to be that pci_resource_to_user() always converts the resources back into a BAR values since that's what the /proc interface was supposed to deal with. However, for X to work on platforms where PCI MMIO is not mapped 1:1, it became a habit of platforms like powerpc to pass "fixed up" values there since X expects to be able to use values from /proc/bus/pci/devices as offsets to mmap of /dev/mem... So we keep that contraption here, causing also /sys/*/resource to expose fully absolute MMIO addresses instead of BAR values, which is ugly, but should still work as long as those are only used to calculate alignment within a page. X is still broken when built 32 bits on machines where PCI MMIO can be above 32-bit space unfortunately. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
#ifdef __KERNEL__
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#ifndef _ASM_PCI_BRIDGE_H
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#define _ASM_PCI_BRIDGE_H
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#include <linux/ioport.h>
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#include <linux/pci.h>
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struct device_node;
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struct pci_controller;
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/*
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* pci_io_base returns the memory address at which you can access
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* the I/O space for PCI bus number `bus' (or NULL on error).
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*/
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extern void __iomem *pci_bus_io_base(unsigned int bus);
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extern unsigned long pci_bus_io_base_phys(unsigned int bus);
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extern unsigned long pci_bus_mem_base_phys(unsigned int bus);
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/* Allocate a new PCI host bridge structure */
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extern struct pci_controller* pcibios_alloc_controller(void);
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/* Helper function for setting up resources */
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extern void pci_init_resource(struct resource *res, resource_size_t start,
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resource_size_t end, int flags, char *name);
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/* Get the PCI host controller for a bus */
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extern struct pci_controller* pci_bus_to_hose(int bus);
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/* Get the PCI host controller for an OF device */
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extern struct pci_controller*
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pci_find_hose_for_OF_device(struct device_node* node);
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/* Fill up host controller resources from the OF node */
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extern void
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pci_process_bridge_OF_ranges(struct pci_controller *hose,
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struct device_node *dev, int primary);
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/*
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* Structure of a PCI controller (host bridge)
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*/
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struct pci_controller {
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int index; /* PCI domain number */
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struct pci_controller *next;
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struct pci_bus *bus;
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void *arch_data;
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struct device *parent;
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int first_busno;
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int last_busno;
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int bus_offset;
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void __iomem *io_base_virt;
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resource_size_t io_base_phys;
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/* Some machines (PReP) have a non 1:1 mapping of
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* the PCI memory space in the CPU bus space
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*/
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resource_size_t pci_mem_offset;
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struct pci_ops *ops;
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volatile unsigned int __iomem *cfg_addr;
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volatile void __iomem *cfg_data;
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/*
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* If set, indirect method will set the cfg_type bit as
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* needed to generate type 1 configuration transactions.
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*/
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int set_cfg_type;
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/* Currently, we limit ourselves to 1 IO range and 3 mem
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* ranges since the common pci_bus structure can't handle more
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*/
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struct resource io_resource;
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struct resource mem_resources[3];
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int mem_resource_count;
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/* Host bridge I/O and Memory space
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* Used for BAR placement algorithms
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*/
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struct resource io_space;
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struct resource mem_space;
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};
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static inline struct pci_controller *pci_bus_to_host(struct pci_bus *bus)
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{
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return bus->sysdata;
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}
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/* These are used for config access before all the PCI probing
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has been done. */
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int early_read_config_byte(struct pci_controller *hose, int bus, int dev_fn,
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int where, u8 *val);
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int early_read_config_word(struct pci_controller *hose, int bus, int dev_fn,
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int where, u16 *val);
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int early_read_config_dword(struct pci_controller *hose, int bus, int dev_fn,
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int where, u32 *val);
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int early_write_config_byte(struct pci_controller *hose, int bus, int dev_fn,
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int where, u8 val);
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int early_write_config_word(struct pci_controller *hose, int bus, int dev_fn,
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int where, u16 val);
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int early_write_config_dword(struct pci_controller *hose, int bus, int dev_fn,
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int where, u32 val);
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extern void setup_indirect_pci_nomap(struct pci_controller* hose,
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void __iomem *cfg_addr, void __iomem *cfg_data);
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extern void setup_indirect_pci(struct pci_controller* hose,
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u32 cfg_addr, u32 cfg_data);
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extern void setup_grackle(struct pci_controller *hose);
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extern unsigned char common_swizzle(struct pci_dev *, unsigned char *);
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/*
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* The following code swizzles for exactly one bridge. The routine
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* common_swizzle below handles multiple bridges. But there are a
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* some boards that don't follow the PCI spec's suggestion so we
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* break this piece out separately.
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*/
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static inline unsigned char bridge_swizzle(unsigned char pin,
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unsigned char idsel)
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{
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return (((pin-1) + idsel) % 4) + 1;
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}
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/*
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* The following macro is used to lookup irqs in a standard table
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* format for those PPC systems that do not already have PCI
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* interrupts properly routed.
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*/
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/* FIXME - double check this */
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#define PCI_IRQ_TABLE_LOOKUP \
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({ long _ctl_ = -1; \
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if (idsel >= min_idsel && idsel <= max_idsel && pin <= irqs_per_slot) \
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_ctl_ = pci_irq_table[idsel - min_idsel][pin-1]; \
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_ctl_; })
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/*
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* Scan the buses below a given PCI host bridge and assign suitable
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* resources to all devices found.
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*/
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extern int pciauto_bus_scan(struct pci_controller *, int);
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#ifdef CONFIG_PCI
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extern unsigned long pci_address_to_pio(phys_addr_t address);
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#else
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static inline unsigned long pci_address_to_pio(phys_addr_t address)
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{
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return (unsigned long)-1;
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}
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#endif
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#endif
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#endif /* __KERNEL__ */
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