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