arch/powerpc/include/asm/eeh.h

   1 /*
   2  * eeh.h
   3  * Copyright (C) 2001  Dave Engebretsen & Todd Inglett IBM Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  */
  19
  20 #ifndef _POWERPC_EEH_H
  21 #define _POWERPC_EEH_H
  22 #ifdef __KERNEL__
  23
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/string.h>
  27
  28 struct pci_dev;
  29 struct pci_bus;
  30 struct device_node;
  31
  32 #ifdef CONFIG_EEH
  33
  34 extern int eeh_subsystem_enabled;
  35
  36 /* Values for eeh_mode bits in device_node */
  37 #define EEH_MODE_SUPPORTED     (1<<0)
  38 #define EEH_MODE_NOCHECK       (1<<1)
  39 #define EEH_MODE_ISOLATED      (1<<2)
  40 #define EEH_MODE_RECOVERING    (1<<3)
  41 #define EEH_MODE_IRQ_DISABLED  (1<<4)
  42
  43 /* Max number of EEH freezes allowed before we consider the device
  44  * to be permanently disabled. */
  45 #define EEH_MAX_ALLOWED_FREEZES 5
  46
  47 void __init eeh_init(void);
  48 unsigned long eeh_check_failure(const volatile void __iomem *token,
  49                                 unsigned long val);
  50 int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
  51 void __init pci_addr_cache_build(void);
  52
  53 /**
  54  * eeh_add_device_early
  55  * eeh_add_device_late
  56  *
  57  * Perform eeh initialization for devices added after boot.
  58  * Call eeh_add_device_early before doing any i/o to the
  59  * device (including config space i/o).  Call eeh_add_device_late
  60  * to finish the eeh setup for this device.
  61  */
  62 void eeh_add_device_tree_early(struct device_node *);
  63 void eeh_add_device_tree_late(struct pci_bus *);
  64
  65 /**
  66  * eeh_remove_device_recursive - undo EEH for device & children.
  67  * @dev: pci device to be removed
  68  *
  69  * As above, this removes the device; it also removes child
  70  * pci devices as well.
  71  */
  72 void eeh_remove_bus_device(struct pci_dev *);
  73
  74 /**
  75  * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
  76  *
  77  * If this macro yields TRUE, the caller relays to eeh_check_failure()
  78  * which does further tests out of line.
  79  */
  80 #define EEH_POSSIBLE_ERROR(val, type)   ((val) == (type)~0 && eeh_subsystem_enabled)
  81
  82 /*
  83  * Reads from a device which has been isolated by EEH will return
  84  * all 1s.  This macro gives an all-1s value of the given size (in
  85  * bytes: 1, 2, or 4) for comparing with the result of a read.
  86  */
  87 #define EEH_IO_ERROR_VALUE(size)        (~0U >> ((4 - (size)) * 8))
  88
  89 #else /* !CONFIG_EEH */
  90 static inline void eeh_init(void) { }
  91
  92 static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
  93 {
  94         return val;
  95 }
  96
  97 static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
  98 {
  99         return 0;
 100 }
 101
 102 static inline void pci_addr_cache_build(void) { }
 103
 104 static inline void eeh_add_device_tree_early(struct device_node *dn) { }
 105
 106 static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }
 107
 108 static inline void eeh_remove_bus_device(struct pci_dev *dev) { }
 109 #define EEH_POSSIBLE_ERROR(val, type) (0)
 110 #define EEH_IO_ERROR_VALUE(size) (-1UL)
 111 #endif /* CONFIG_EEH */
 112
 113 #ifdef CONFIG_PPC64
 114 /*
 115  * MMIO read/write operations with EEH support.
 116  */
 117 static inline u8 eeh_readb(const volatile void __iomem *addr)
 118 {
 119         u8 val = in_8(addr);
 120         if (EEH_POSSIBLE_ERROR(val, u8))
 121                 return eeh_check_failure(addr, val);
 122         return val;
 123 }
 124
 125 static inline u16 eeh_readw(const volatile void __iomem *addr)
 126 {
 127         u16 val = in_le16(addr);
 128         if (EEH_POSSIBLE_ERROR(val, u16))
 129                 return eeh_check_failure(addr, val);
 130         return val;
 131 }
 132
 133 static inline u32 eeh_readl(const volatile void __iomem *addr)
 134 {
 135         u32 val = in_le32(addr);
 136         if (EEH_POSSIBLE_ERROR(val, u32))
 137                 return eeh_check_failure(addr, val);
 138         return val;
 139 }
 140
 141 static inline u64 eeh_readq(const volatile void __iomem *addr)
 142 {
 143         u64 val = in_le64(addr);
 144         if (EEH_POSSIBLE_ERROR(val, u64))
 145                 return eeh_check_failure(addr, val);
 146         return val;
 147 }
 148
 149 static inline u16 eeh_readw_be(const volatile void __iomem *addr)
 150 {
 151         u16 val = in_be16(addr);
 152         if (EEH_POSSIBLE_ERROR(val, u16))
 153                 return eeh_check_failure(addr, val);
 154         return val;
 155 }
 156
 157 static inline u32 eeh_readl_be(const volatile void __iomem *addr)
 158 {
 159         u32 val = in_be32(addr);
 160         if (EEH_POSSIBLE_ERROR(val, u32))
 161                 return eeh_check_failure(addr, val);
 162         return val;
 163 }
 164
 165 static inline u64 eeh_readq_be(const volatile void __iomem *addr)
 166 {
 167         u64 val = in_be64(addr);
 168         if (EEH_POSSIBLE_ERROR(val, u64))
 169                 return eeh_check_failure(addr, val);
 170         return val;
 171 }
 172
 173 static inline void eeh_memcpy_fromio(void *dest, const
 174                                      volatile void __iomem *src,
 175                                      unsigned long n)
 176 {
 177         _memcpy_fromio(dest, src, n);
 178
 179         /* Look for ffff's here at dest[n].  Assume that at least 4 bytes
 180          * were copied. Check all four bytes.
 181          */
 182         if (n >= 4 && EEH_POSSIBLE_ERROR(*((u32 *)(dest + n - 4)), u32))
 183                 eeh_check_failure(src, *((u32 *)(dest + n - 4)));
 184 }
 185
 186 /* in-string eeh macros */
 187 static inline void eeh_readsb(const volatile void __iomem *addr, void * buf,
 188                               int ns)
 189 {
 190         _insb(addr, buf, ns);
 191         if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
 192                 eeh_check_failure(addr, *(u8*)buf);
 193 }
 194
 195 static inline void eeh_readsw(const volatile void __iomem *addr, void * buf,
 196                               int ns)
 197 {
 198         _insw(addr, buf, ns);
 199         if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
 200                 eeh_check_failure(addr, *(u16*)buf);
 201 }
 202
 203 static inline void eeh_readsl(const volatile void __iomem *addr, void * buf,
 204                               int nl)
 205 {
 206         _insl(addr, buf, nl);
 207         if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
 208                 eeh_check_failure(addr, *(u32*)buf);
 209 }
 210
 211 #endif /* CONFIG_PPC64 */
 212 #endif /* __KERNEL__ */
 213 #endif /* _POWERPC_EEH_H */