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Diffstat (limited to 'include/asm-powerpc/eeh.h')
| -rw-r--r-- | include/asm-powerpc/eeh.h | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/include/asm-powerpc/eeh.h b/include/asm-powerpc/eeh.h new file mode 100644 index 000000000000..f8633aafe4ba --- /dev/null +++ b/include/asm-powerpc/eeh.h @@ -0,0 +1,366 @@ +/* + * 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 _PPC64_EEH_H +#define _PPC64_EEH_H + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/string.h> + +struct pci_dev; +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) + +/* 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_early(struct device_node *); +void eeh_add_device_late(struct pci_dev *); + +/** + * eeh_remove_device - undo EEH setup for the indicated pci device + * @dev: pci device to be removed + * + * This routine should be called when a device is removed from + * a running system (e.g. by hotplug or dlpar). It unregisters + * the PCI device from the EEH subsystem. I/O errors affecting + * this device will no longer be detected after this call; thus, + * i/o errors affecting this slot may leave this device unusable. + */ +void eeh_remove_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_early(struct device_node *dn) { } + +static inline void eeh_add_device_late(struct pci_dev *dev) { } + +static inline void eeh_remove_device(struct pci_dev *dev) { } + +#define EEH_POSSIBLE_ERROR(val, type) (0) +#define EEH_IO_ERROR_VALUE(size) (-1UL) +#endif /* CONFIG_EEH */ + +/* + * 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 void eeh_writeb(u8 val, volatile void __iomem *addr) +{ + out_8(addr, 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 void eeh_writew(u16 val, volatile void __iomem *addr) +{ + out_le16(addr, val); +} +static inline u16 eeh_raw_readw(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 void eeh_raw_writew(u16 val, volatile void __iomem *addr) { + volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr; + out_be16(vaddr, 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 void eeh_writel(u32 val, volatile void __iomem *addr) +{ + out_le32(addr, val); +} +static inline u32 eeh_raw_readl(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 void eeh_raw_writel(u32 val, volatile void __iomem *addr) +{ + out_be32(addr, 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 void eeh_writeq(u64 val, volatile void __iomem *addr) +{ + out_le64(addr, val); +} +static inline u64 eeh_raw_readq(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_raw_writeq(u64 val, volatile void __iomem *addr) +{ + out_be64(addr, val); +} + +#define EEH_CHECK_ALIGN(v,a) \ + ((((unsigned long)(v)) & ((a) - 1)) == 0) + +static inline void eeh_memset_io(volatile void __iomem *addr, int c, + unsigned long n) +{ + void *p = (void __force *)addr; + u32 lc = c; + lc |= lc << 8; + lc |= lc << 16; + + while(n && !EEH_CHECK_ALIGN(p, 4)) { + *((volatile u8 *)p) = c; + p++; + n--; + } + while(n >= 4) { + *((volatile u32 *)p) = lc; + p += 4; + n -= 4; + } + while(n) { + *((volatile u8 *)p) = c; + p++; + n--; + } + __asm__ __volatile__ ("sync" : : : "memory"); +} +static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src, + unsigned long n) +{ + void *vsrc = (void __force *) src; + void *destsave = dest; + unsigned long nsave = n; + + while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) { + *((u8 *)dest) = *((volatile u8 *)vsrc); + __asm__ __volatile__ ("eieio" : : : "memory"); + vsrc++; + dest++; + n--; + } + while(n > 4) { + *((u32 *)dest) = *((volatile u32 *)vsrc); + __asm__ __volatile__ ("eieio" : : : "memory"); + vsrc += 4; + dest += 4; + n -= 4; + } + while(n) { + *((u8 *)dest) = *((volatile u8 *)vsrc); + __asm__ __volatile__ ("eieio" : : : "memory"); + vsrc++; + dest++; + n--; + } + __asm__ __volatile__ ("sync" : : : "memory"); + + /* Look for ffff's here at dest[n]. Assume that at least 4 bytes + * were copied. Check all four bytes. + */ + if ((nsave >= 4) && + (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) { + eeh_check_failure(src, (*((u32 *) destsave+nsave-4))); + } +} + +static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src, + unsigned long n) +{ + void *vdest = (void __force *) dest; + + while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) { + *((volatile u8 *)vdest) = *((u8 *)src); + src++; + vdest++; + n--; + } + while(n > 4) { + *((volatile u32 *)vdest) = *((volatile u32 *)src); + src += 4; + vdest += 4; + n-=4; + } + while(n) { + *((volatile u8 *)vdest) = *((u8 *)src); + src++; + vdest++; + n--; + } + __asm__ __volatile__ ("sync" : : : "memory"); +} + +#undef EEH_CHECK_ALIGN + +static inline u8 eeh_inb(unsigned long port) +{ + u8 val; + if (!_IO_IS_VALID(port)) + return ~0; + val = in_8((u8 __iomem *)(port+pci_io_base)); + if (EEH_POSSIBLE_ERROR(val, u8)) + return eeh_check_failure((void __iomem *)(port), val); + return val; +} + +static inline void eeh_outb(u8 val, unsigned long port) +{ + if (_IO_IS_VALID(port)) + out_8((u8 __iomem *)(port+pci_io_base), val); +} + +static inline u16 eeh_inw(unsigned long port) +{ + u16 val; + if (!_IO_IS_VALID(port)) + return ~0; + val = in_le16((u16 __iomem *)(port+pci_io_base)); + if (EEH_POSSIBLE_ERROR(val, u16)) + return eeh_check_failure((void __iomem *)(port), val); + return val; +} + +static inline void eeh_outw(u16 val, unsigned long port) +{ + if (_IO_IS_VALID(port)) + out_le16((u16 __iomem *)(port+pci_io_base), val); +} + +static inline u32 eeh_inl(unsigned long port) +{ + u32 val; + if (!_IO_IS_VALID(port)) + return ~0; + val = in_le32((u32 __iomem *)(port+pci_io_base)); + if (EEH_POSSIBLE_ERROR(val, u32)) + return eeh_check_failure((void __iomem *)(port), val); + return val; +} + +static inline void eeh_outl(u32 val, unsigned long port) +{ + if (_IO_IS_VALID(port)) + out_le32((u32 __iomem *)(port+pci_io_base), val); +} + +/* in-string eeh macros */ +static inline void eeh_insb(unsigned long port, void * buf, int ns) +{ + _insb((u8 __iomem *)(port+pci_io_base), buf, ns); + if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8)) + eeh_check_failure((void __iomem *)(port), *(u8*)buf); +} + +static inline void eeh_insw_ns(unsigned long port, void * buf, int ns) +{ + _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns); + if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16)) + eeh_check_failure((void __iomem *)(port), *(u16*)buf); +} + +static inline void eeh_insl_ns(unsigned long port, void * buf, int nl) +{ + _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl); + if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32)) + eeh_check_failure((void __iomem *)(port), *(u32*)buf); +} + +#endif /* _PPC64_EEH_H */ |