214 lines
5.8 KiB
C
214 lines
5.8 KiB
C
/*
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* eeh.h
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* Copyright (C) 2001 Dave Engebretsen & Todd Inglett IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _POWERPC_EEH_H
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#define _POWERPC_EEH_H
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#ifdef __KERNEL__
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/string.h>
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struct pci_dev;
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struct pci_bus;
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struct device_node;
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#ifdef CONFIG_EEH
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extern int eeh_subsystem_enabled;
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/* Values for eeh_mode bits in device_node */
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#define EEH_MODE_SUPPORTED (1<<0)
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#define EEH_MODE_NOCHECK (1<<1)
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#define EEH_MODE_ISOLATED (1<<2)
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#define EEH_MODE_RECOVERING (1<<3)
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#define EEH_MODE_IRQ_DISABLED (1<<4)
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/* Max number of EEH freezes allowed before we consider the device
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* to be permanently disabled. */
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#define EEH_MAX_ALLOWED_FREEZES 5
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void __init eeh_init(void);
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unsigned long eeh_check_failure(const volatile void __iomem *token,
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unsigned long val);
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int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
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void __init pci_addr_cache_build(void);
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/**
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* eeh_add_device_early
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* eeh_add_device_late
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*
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* Perform eeh initialization for devices added after boot.
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* Call eeh_add_device_early before doing any i/o to the
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* device (including config space i/o). Call eeh_add_device_late
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* to finish the eeh setup for this device.
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*/
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void eeh_add_device_tree_early(struct device_node *);
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void eeh_add_device_tree_late(struct pci_bus *);
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/**
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* eeh_remove_device_recursive - undo EEH for device & children.
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* @dev: pci device to be removed
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*
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* As above, this removes the device; it also removes child
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* pci devices as well.
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*/
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void eeh_remove_bus_device(struct pci_dev *);
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/**
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* EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
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*
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* If this macro yields TRUE, the caller relays to eeh_check_failure()
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* which does further tests out of line.
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*/
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#define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0 && eeh_subsystem_enabled)
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/*
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* Reads from a device which has been isolated by EEH will return
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* all 1s. This macro gives an all-1s value of the given size (in
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* bytes: 1, 2, or 4) for comparing with the result of a read.
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*/
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#define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8))
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#else /* !CONFIG_EEH */
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static inline void eeh_init(void) { }
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static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
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{
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return val;
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}
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static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
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{
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return 0;
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}
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static inline void pci_addr_cache_build(void) { }
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static inline void eeh_add_device_tree_early(struct device_node *dn) { }
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static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }
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static inline void eeh_remove_bus_device(struct pci_dev *dev) { }
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#define EEH_POSSIBLE_ERROR(val, type) (0)
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#define EEH_IO_ERROR_VALUE(size) (-1UL)
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#endif /* CONFIG_EEH */
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#ifdef CONFIG_PPC64
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/*
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* MMIO read/write operations with EEH support.
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*/
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static inline u8 eeh_readb(const volatile void __iomem *addr)
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{
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u8 val = in_8(addr);
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if (EEH_POSSIBLE_ERROR(val, u8))
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return eeh_check_failure(addr, val);
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return val;
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}
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static inline u16 eeh_readw(const volatile void __iomem *addr)
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{
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u16 val = in_le16(addr);
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if (EEH_POSSIBLE_ERROR(val, u16))
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return eeh_check_failure(addr, val);
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return val;
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}
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static inline u32 eeh_readl(const volatile void __iomem *addr)
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{
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u32 val = in_le32(addr);
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if (EEH_POSSIBLE_ERROR(val, u32))
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return eeh_check_failure(addr, val);
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return val;
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}
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static inline u64 eeh_readq(const volatile void __iomem *addr)
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{
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u64 val = in_le64(addr);
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if (EEH_POSSIBLE_ERROR(val, u64))
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return eeh_check_failure(addr, val);
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return val;
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}
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static inline u16 eeh_readw_be(const volatile void __iomem *addr)
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{
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u16 val = in_be16(addr);
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if (EEH_POSSIBLE_ERROR(val, u16))
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return eeh_check_failure(addr, val);
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return val;
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}
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static inline u32 eeh_readl_be(const volatile void __iomem *addr)
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{
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u32 val = in_be32(addr);
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if (EEH_POSSIBLE_ERROR(val, u32))
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return eeh_check_failure(addr, val);
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return val;
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}
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static inline u64 eeh_readq_be(const volatile void __iomem *addr)
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{
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u64 val = in_be64(addr);
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if (EEH_POSSIBLE_ERROR(val, u64))
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return eeh_check_failure(addr, val);
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return val;
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}
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static inline void eeh_memcpy_fromio(void *dest, const
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volatile void __iomem *src,
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unsigned long n)
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{
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_memcpy_fromio(dest, src, n);
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/* Look for ffff's here at dest[n]. Assume that at least 4 bytes
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* were copied. Check all four bytes.
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*/
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if (n >= 4 && EEH_POSSIBLE_ERROR(*((u32 *)(dest + n - 4)), u32))
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eeh_check_failure(src, *((u32 *)(dest + n - 4)));
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}
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/* in-string eeh macros */
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static inline void eeh_readsb(const volatile void __iomem *addr, void * buf,
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int ns)
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{
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_insb(addr, buf, ns);
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if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
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eeh_check_failure(addr, *(u8*)buf);
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}
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static inline void eeh_readsw(const volatile void __iomem *addr, void * buf,
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int ns)
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{
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_insw(addr, buf, ns);
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if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
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eeh_check_failure(addr, *(u16*)buf);
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}
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static inline void eeh_readsl(const volatile void __iomem *addr, void * buf,
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int nl)
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{
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_insl(addr, buf, nl);
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if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
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eeh_check_failure(addr, *(u32*)buf);
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}
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#endif /* CONFIG_PPC64 */
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#endif /* __KERNEL__ */
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#endif /* _POWERPC_EEH_H */
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