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/*
* 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 */
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