3 * Copyright (C) 2001 Dave Engebretsen & Todd Inglett IBM Corporation.
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.
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.
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
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/string.h>
34 extern int eeh_subsystem_enabled
;
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)
43 /* Max number of EEH freezes allowed before we consider the device
44 * to be permanently disabled. */
45 #define EEH_MAX_ALLOWED_FREEZES 5
47 void __init
eeh_init(void);
48 unsigned long eeh_check_failure(const volatile void __iomem
*token
,
50 int eeh_dn_check_failure(struct device_node
*dn
, struct pci_dev
*dev
);
51 void __init
pci_addr_cache_build(void);
54 * eeh_add_device_early
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.
62 void eeh_add_device_tree_early(struct device_node
*);
63 void eeh_add_device_tree_late(struct pci_bus
*);
66 * eeh_remove_device_recursive - undo EEH for device & children.
67 * @dev: pci device to be removed
69 * As above, this removes the device; it also removes child
70 * pci devices as well.
72 void eeh_remove_bus_device(struct pci_dev
*);
75 * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
77 * If this macro yields TRUE, the caller relays to eeh_check_failure()
78 * which does further tests out of line.
80 #define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0 && eeh_subsystem_enabled)
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.
87 #define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8))
89 #else /* !CONFIG_EEH */
90 static inline void eeh_init(void) { }
92 static inline unsigned long eeh_check_failure(const volatile void __iomem
*token
, unsigned long val
)
97 static inline int eeh_dn_check_failure(struct device_node
*dn
, struct pci_dev
*dev
)
102 static inline void pci_addr_cache_build(void) { }
104 static inline void eeh_add_device_tree_early(struct device_node
*dn
) { }
106 static inline void eeh_add_device_tree_late(struct pci_bus
*bus
) { }
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 */
114 * MMIO read/write operations with EEH support.
116 static inline u8
eeh_readb(const volatile void __iomem
*addr
)
119 if (EEH_POSSIBLE_ERROR(val
, u8
))
120 return eeh_check_failure(addr
, val
);
124 static inline u16
eeh_readw(const volatile void __iomem
*addr
)
126 u16 val
= in_le16(addr
);
127 if (EEH_POSSIBLE_ERROR(val
, u16
))
128 return eeh_check_failure(addr
, val
);
132 static inline u32
eeh_readl(const volatile void __iomem
*addr
)
134 u32 val
= in_le32(addr
);
135 if (EEH_POSSIBLE_ERROR(val
, u32
))
136 return eeh_check_failure(addr
, val
);
140 static inline u64
eeh_readq(const volatile void __iomem
*addr
)
142 u64 val
= in_le64(addr
);
143 if (EEH_POSSIBLE_ERROR(val
, u64
))
144 return eeh_check_failure(addr
, val
);
148 static inline u16
eeh_readw_be(const volatile void __iomem
*addr
)
150 u16 val
= in_be16(addr
);
151 if (EEH_POSSIBLE_ERROR(val
, u16
))
152 return eeh_check_failure(addr
, val
);
156 static inline u32
eeh_readl_be(const volatile void __iomem
*addr
)
158 u32 val
= in_be32(addr
);
159 if (EEH_POSSIBLE_ERROR(val
, u32
))
160 return eeh_check_failure(addr
, val
);
164 static inline u64
eeh_readq_be(const volatile void __iomem
*addr
)
166 u64 val
= in_be64(addr
);
167 if (EEH_POSSIBLE_ERROR(val
, u64
))
168 return eeh_check_failure(addr
, val
);
172 #define EEH_CHECK_ALIGN(v,a) \
173 ((((unsigned long)(v)) & ((a) - 1)) == 0)
175 static inline void eeh_memset_io(volatile void __iomem
*addr
, int c
,
178 void *p
= (void __force
*)addr
;
183 __asm__
__volatile__ ("sync" : : : "memory");
184 while(n
&& !EEH_CHECK_ALIGN(p
, 4)) {
185 *((volatile u8
*)p
) = c
;
190 *((volatile u32
*)p
) = lc
;
195 *((volatile u8
*)p
) = c
;
199 __asm__
__volatile__ ("sync" : : : "memory");
201 static inline void eeh_memcpy_fromio(void *dest
, const volatile void __iomem
*src
,
204 void *vsrc
= (void __force
*) src
;
205 void *destsave
= dest
;
206 unsigned long nsave
= n
;
208 __asm__
__volatile__ ("sync" : : : "memory");
209 while(n
&& (!EEH_CHECK_ALIGN(vsrc
, 4) || !EEH_CHECK_ALIGN(dest
, 4))) {
210 *((u8
*)dest
) = *((volatile u8
*)vsrc
);
211 __asm__
__volatile__ ("eieio" : : : "memory");
217 *((u32
*)dest
) = *((volatile u32
*)vsrc
);
218 __asm__
__volatile__ ("eieio" : : : "memory");
224 *((u8
*)dest
) = *((volatile u8
*)vsrc
);
225 __asm__
__volatile__ ("eieio" : : : "memory");
230 __asm__
__volatile__ ("sync" : : : "memory");
232 /* Look for ffff's here at dest[n]. Assume that at least 4 bytes
233 * were copied. Check all four bytes.
236 (EEH_POSSIBLE_ERROR((*((u32
*) destsave
+nsave
-4)), u32
))) {
237 eeh_check_failure(src
, (*((u32
*) destsave
+nsave
-4)));
241 static inline void eeh_memcpy_toio(volatile void __iomem
*dest
, const void *src
,
244 void *vdest
= (void __force
*) dest
;
246 __asm__
__volatile__ ("sync" : : : "memory");
247 while(n
&& (!EEH_CHECK_ALIGN(vdest
, 4) || !EEH_CHECK_ALIGN(src
, 4))) {
248 *((volatile u8
*)vdest
) = *((u8
*)src
);
254 *((volatile u32
*)vdest
) = *((volatile u32
*)src
);
260 *((volatile u8
*)vdest
) = *((u8
*)src
);
265 __asm__
__volatile__ ("sync" : : : "memory");
268 #undef EEH_CHECK_ALIGN
270 /* in-string eeh macros */
271 static inline void eeh_readsb(const volatile void __iomem
*addr
, void * buf
,
274 _insb(addr
, buf
, ns
);
275 if (EEH_POSSIBLE_ERROR((*(((u8
*)buf
)+ns
-1)), u8
))
276 eeh_check_failure(addr
, *(u8
*)buf
);
279 static inline void eeh_readsw(const volatile void __iomem
*addr
, void * buf
,
282 _insw(addr
, buf
, ns
);
283 if (EEH_POSSIBLE_ERROR((*(((u16
*)buf
)+ns
-1)), u16
))
284 eeh_check_failure(addr
, *(u16
*)buf
);
287 static inline void eeh_readsl(const volatile void __iomem
*addr
, void * buf
,
290 _insl(addr
, buf
, nl
);
291 if (EEH_POSSIBLE_ERROR((*(((u32
*)buf
)+nl
-1)), u32
))
292 eeh_check_failure(addr
, *(u32
*)buf
);
295 #endif /* __KERNEL__ */
296 #endif /* _PPC64_EEH_H */