fd6852c8fa
The pseries PCI hotplug code has a number of issues, ranging from incorrect resource setup to crashes, depending on what is added, when, whether it contains a bridge, etc etc.... This fixes a whole bunch of these, while actually simplifying the code a bit, using more generic code in the process and factoring out common code between adding of a PHB, a slot or a device. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
307 lines
9.3 KiB
C
307 lines
9.3 KiB
C
#ifndef _ASM_POWERPC_PCI_BRIDGE_H
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#define _ASM_POWERPC_PCI_BRIDGE_H
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#ifdef __KERNEL__
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/pci.h>
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#include <linux/list.h>
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#include <linux/ioport.h>
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struct device_node;
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extern unsigned int ppc_pci_flags;
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enum {
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/* Force re-assigning all resources (ignore firmware
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* setup completely)
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*/
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PPC_PCI_REASSIGN_ALL_RSRC = 0x00000001,
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/* Re-assign all bus numbers */
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PPC_PCI_REASSIGN_ALL_BUS = 0x00000002,
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/* Do not try to assign, just use existing setup */
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PPC_PCI_PROBE_ONLY = 0x00000004,
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/* Don't bother with ISA alignment unless the bridge has
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* ISA forwarding enabled
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*/
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PPC_PCI_CAN_SKIP_ISA_ALIGN = 0x00000008,
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/* Enable domain numbers in /proc */
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PPC_PCI_ENABLE_PROC_DOMAINS = 0x00000010,
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/* ... except for domain 0 */
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PPC_PCI_COMPAT_DOMAIN_0 = 0x00000020,
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};
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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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struct pci_bus *bus;
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char is_dynamic;
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#ifdef CONFIG_PPC64
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int node;
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#endif
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struct device_node *dn;
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struct list_head list_node;
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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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#ifndef CONFIG_PPC64
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int self_busno;
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#endif
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void __iomem *io_base_virt;
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#ifdef CONFIG_PPC64
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void *io_base_alloc;
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#endif
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resource_size_t io_base_phys;
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#ifndef CONFIG_PPC64
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resource_size_t pci_io_size;
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#endif
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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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#ifdef CONFIG_PPC64
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unsigned long pci_io_size;
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#endif
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/* Some machines have a special region to forward the ISA
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* "memory" cycles such as VGA memory regions. Left to 0
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* if unsupported
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*/
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resource_size_t isa_mem_phys;
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resource_size_t isa_mem_size;
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struct pci_ops *ops;
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unsigned int __iomem *cfg_addr;
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void __iomem *cfg_data;
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#ifndef CONFIG_PPC64
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/*
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* Used for variants of PCI indirect handling and possible quirks:
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* SET_CFG_TYPE - used on 4xx or any PHB that does explicit type0/1
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* EXT_REG - provides access to PCI-e extended registers
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* SURPRESS_PRIMARY_BUS - we surpress the setting of PCI_PRIMARY_BUS
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* on Freescale PCI-e controllers since they used the PCI_PRIMARY_BUS
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* to determine which bus number to match on when generating type0
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* config cycles
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* NO_PCIE_LINK - the Freescale PCI-e controllers have issues with
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* hanging if we don't have link and try to do config cycles to
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* anything but the PHB. Only allow talking to the PHB if this is
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* set.
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* BIG_ENDIAN - cfg_addr is a big endian register
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* BROKEN_MRM - the 440EPx/GRx chips have an errata that causes hangs on
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* the PLB4. Effectively disable MRM commands by setting this.
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*/
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#define PPC_INDIRECT_TYPE_SET_CFG_TYPE 0x00000001
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#define PPC_INDIRECT_TYPE_EXT_REG 0x00000002
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#define PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS 0x00000004
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#define PPC_INDIRECT_TYPE_NO_PCIE_LINK 0x00000008
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#define PPC_INDIRECT_TYPE_BIG_ENDIAN 0x00000010
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#define PPC_INDIRECT_TYPE_BROKEN_MRM 0x00000020
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u32 indirect_type;
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#endif /* !CONFIG_PPC64 */
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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 global_number; /* PCI domain number */
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#ifdef CONFIG_PPC64
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unsigned long buid;
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unsigned long dma_window_base_cur;
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unsigned long dma_window_size;
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void *private_data;
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#endif /* CONFIG_PPC64 */
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};
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#ifndef CONFIG_PPC64
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static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
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{
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return bus->sysdata;
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}
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static inline int isa_vaddr_is_ioport(void __iomem *address)
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{
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/* No specific ISA handling on ppc32 at this stage, it
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* all goes through PCI
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*/
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return 0;
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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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extern int early_read_config_byte(struct pci_controller *hose, int bus,
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int dev_fn, int where, u8 *val);
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extern int early_read_config_word(struct pci_controller *hose, int bus,
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int dev_fn, int where, u16 *val);
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extern int early_read_config_dword(struct pci_controller *hose, int bus,
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int dev_fn, int where, u32 *val);
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extern int early_write_config_byte(struct pci_controller *hose, int bus,
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int dev_fn, int where, u8 val);
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extern int early_write_config_word(struct pci_controller *hose, int bus,
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int dev_fn, int where, u16 val);
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extern int early_write_config_dword(struct pci_controller *hose, int bus,
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int dev_fn, int where, u32 val);
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extern int early_find_capability(struct pci_controller *hose, int bus,
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int dev_fn, int cap);
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extern void setup_indirect_pci(struct pci_controller* hose,
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resource_size_t cfg_addr,
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resource_size_t cfg_data, u32 flags);
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extern void setup_grackle(struct pci_controller *hose);
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#else /* CONFIG_PPC64 */
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/*
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* PCI stuff, for nodes representing PCI devices, pointed to
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* by device_node->data.
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*/
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struct iommu_table;
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struct pci_dn {
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int busno; /* pci bus number */
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int devfn; /* pci device and function number */
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struct pci_controller *phb; /* for pci devices */
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struct iommu_table *iommu_table; /* for phb's or bridges */
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struct device_node *node; /* back-pointer to the device_node */
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int pci_ext_config_space; /* for pci devices */
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#ifdef CONFIG_EEH
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struct pci_dev *pcidev; /* back-pointer to the pci device */
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int class_code; /* pci device class */
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int eeh_mode; /* See eeh.h for possible EEH_MODEs */
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int eeh_config_addr;
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int eeh_pe_config_addr; /* new-style partition endpoint address */
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int eeh_check_count; /* # times driver ignored error */
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int eeh_freeze_count; /* # times this device froze up. */
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int eeh_false_positives; /* # times this device reported #ff's */
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u32 config_space[16]; /* saved PCI config space */
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#endif
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};
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/* Get the pointer to a device_node's pci_dn */
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#define PCI_DN(dn) ((struct pci_dn *) (dn)->data)
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extern struct device_node *fetch_dev_dn(struct pci_dev *dev);
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/* Get a device_node from a pci_dev. This code must be fast except
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* in the case where the sysdata is incorrect and needs to be fixed
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* up (this will only happen once).
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* In this case the sysdata will have been inherited from a PCI host
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* bridge or a PCI-PCI bridge further up the tree, so it will point
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* to a valid struct pci_dn, just not the one we want.
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*/
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static inline struct device_node *pci_device_to_OF_node(struct pci_dev *dev)
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{
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struct device_node *dn = dev->sysdata;
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struct pci_dn *pdn = dn->data;
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if (pdn && pdn->devfn == dev->devfn && pdn->busno == dev->bus->number)
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return dn; /* fast path. sysdata is good */
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return fetch_dev_dn(dev);
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}
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static inline int pci_device_from_OF_node(struct device_node *np,
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u8 *bus, u8 *devfn)
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{
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if (!PCI_DN(np))
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return -ENODEV;
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*bus = PCI_DN(np)->busno;
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*devfn = PCI_DN(np)->devfn;
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return 0;
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}
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static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
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{
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if (bus->self)
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return pci_device_to_OF_node(bus->self);
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else
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return bus->sysdata; /* Must be root bus (PHB) */
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}
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/** Find the bus corresponding to the indicated device node */
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extern struct pci_bus *pcibios_find_pci_bus(struct device_node *dn);
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/** Remove all of the PCI devices under this bus */
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extern void pcibios_remove_pci_devices(struct pci_bus *bus);
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/** Discover new pci devices under this bus, and add them */
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extern void pcibios_add_pci_devices(struct pci_bus *bus);
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static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
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{
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struct device_node *busdn = bus->sysdata;
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BUG_ON(busdn == NULL);
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return PCI_DN(busdn)->phb;
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}
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extern void isa_bridge_find_early(struct pci_controller *hose);
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static inline int isa_vaddr_is_ioport(void __iomem *address)
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{
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/* Check if address hits the reserved legacy IO range */
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unsigned long ea = (unsigned long)address;
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return ea >= ISA_IO_BASE && ea < ISA_IO_END;
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}
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extern int pcibios_unmap_io_space(struct pci_bus *bus);
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extern int pcibios_map_io_space(struct pci_bus *bus);
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/* Return values for ppc_md.pci_probe_mode function */
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#define PCI_PROBE_NONE -1 /* Don't look at this bus at all */
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#define PCI_PROBE_NORMAL 0 /* Do normal PCI probing */
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#define PCI_PROBE_DEVTREE 1 /* Instantiate from device tree */
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#ifdef CONFIG_NUMA
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#define PHB_SET_NODE(PHB, NODE) ((PHB)->node = (NODE))
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#else
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#define PHB_SET_NODE(PHB, NODE) ((PHB)->node = -1)
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#endif
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#endif /* CONFIG_PPC64 */
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/* Get the PCI host controller for an OF device */
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extern struct pci_controller *pci_find_hose_for_OF_device(
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struct device_node* node);
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/* Fill up host controller resources from the OF node */
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extern void pci_process_bridge_OF_ranges(struct pci_controller *hose,
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struct device_node *dev, int primary);
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/* Allocate & free a PCI host bridge structure */
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extern struct pci_controller *pcibios_alloc_controller(struct device_node *dev);
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extern void pcibios_free_controller(struct pci_controller *phb);
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extern void pcibios_setup_phb_resources(struct pci_controller *hose);
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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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extern int pcibios_vaddr_is_ioport(void __iomem *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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static inline int pcibios_vaddr_is_ioport(void __iomem *address)
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{
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return 0;
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}
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#endif /* CONFIG_PCI */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_PCI_BRIDGE_H */
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