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/config.h>
25 #include <linux/init.h>
26 #include <linux/list.h>
27 #include <linux/string.h>
35 extern int eeh_subsystem_enabled
;
37 /* Values for eeh_mode bits in device_node */
38 #define EEH_MODE_SUPPORTED (1<<0)
39 #define EEH_MODE_NOCHECK (1<<1)
40 #define EEH_MODE_ISOLATED (1<<2)
41 #define EEH_MODE_RECOVERING (1<<3)
42 #define EEH_MODE_IRQ_DISABLED (1<<4)
44 /* Max number of EEH freezes allowed before we consider the device
45 * to be permanently disabled. */
46 #define EEH_MAX_ALLOWED_FREEZES 5
48 void __init
eeh_init(void);
49 unsigned long eeh_check_failure(const volatile void __iomem
*token
,
51 int eeh_dn_check_failure(struct device_node
*dn
, struct pci_dev
*dev
);
52 void __init
pci_addr_cache_build(void);
55 * eeh_add_device_early
58 * Perform eeh initialization for devices added after boot.
59 * Call eeh_add_device_early before doing any i/o to the
60 * device (including config space i/o). Call eeh_add_device_late
61 * to finish the eeh setup for this device.
63 void eeh_add_device_early(struct device_node
*);
64 void eeh_add_device_tree_early(struct device_node
*);
65 void eeh_add_device_tree_late(struct pci_bus
*);
68 * eeh_remove_device - undo EEH setup for the indicated pci device
69 * @dev: pci device to be removed
71 * This routine should be called when a device is removed from
72 * a running system (e.g. by hotplug or dlpar). It unregisters
73 * the PCI device from the EEH subsystem. I/O errors affecting
74 * this device will no longer be detected after this call; thus,
75 * i/o errors affecting this slot may leave this device unusable.
77 void eeh_remove_device(struct pci_dev
*);
80 * eeh_remove_device_recursive - undo EEH for device & children.
81 * @dev: pci device to be removed
83 * As above, this removes the device; it also removes child
84 * pci devices as well.
86 void eeh_remove_bus_device(struct pci_dev
*);
89 * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
91 * If this macro yields TRUE, the caller relays to eeh_check_failure()
92 * which does further tests out of line.
94 #define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0 && eeh_subsystem_enabled)
97 * Reads from a device which has been isolated by EEH will return
98 * all 1s. This macro gives an all-1s value of the given size (in
99 * bytes: 1, 2, or 4) for comparing with the result of a read.
101 #define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8))
103 #else /* !CONFIG_EEH */
104 static inline void eeh_init(void) { }
106 static inline unsigned long eeh_check_failure(const volatile void __iomem
*token
, unsigned long val
)
111 static inline int eeh_dn_check_failure(struct device_node
*dn
, struct pci_dev
*dev
)
116 static inline void pci_addr_cache_build(void) { }
118 static inline void eeh_add_device_early(struct device_node
*dn
) { }
120 static inline void eeh_remove_device(struct pci_dev
*dev
) { }
122 static inline void eeh_add_device_tree_early(struct device_node
*dn
) { }
124 static inline void eeh_add_device_tree_late(struct pci_bus
*bus
) { }
126 static inline void eeh_remove_bus_device(struct pci_dev
*dev
) { }
127 #define EEH_POSSIBLE_ERROR(val, type) (0)
128 #define EEH_IO_ERROR_VALUE(size) (-1UL)
129 #endif /* CONFIG_EEH */
132 * MMIO read/write operations with EEH support.
134 static inline u8
eeh_readb(const volatile void __iomem
*addr
)
137 if (EEH_POSSIBLE_ERROR(val
, u8
))
138 return eeh_check_failure(addr
, val
);
141 static inline void eeh_writeb(u8 val
, volatile void __iomem
*addr
)
146 static inline u16
eeh_readw(const volatile void __iomem
*addr
)
148 u16 val
= in_le16(addr
);
149 if (EEH_POSSIBLE_ERROR(val
, u16
))
150 return eeh_check_failure(addr
, val
);
153 static inline void eeh_writew(u16 val
, volatile void __iomem
*addr
)
157 static inline u16
eeh_raw_readw(const volatile void __iomem
*addr
)
159 u16 val
= in_be16(addr
);
160 if (EEH_POSSIBLE_ERROR(val
, u16
))
161 return eeh_check_failure(addr
, val
);
164 static inline void eeh_raw_writew(u16 val
, volatile void __iomem
*addr
) {
165 volatile u16 __iomem
*vaddr
= (volatile u16 __iomem
*) addr
;
166 out_be16(vaddr
, val
);
169 static inline u32
eeh_readl(const volatile void __iomem
*addr
)
171 u32 val
= in_le32(addr
);
172 if (EEH_POSSIBLE_ERROR(val
, u32
))
173 return eeh_check_failure(addr
, val
);
176 static inline void eeh_writel(u32 val
, volatile void __iomem
*addr
)
180 static inline u32
eeh_raw_readl(const volatile void __iomem
*addr
)
182 u32 val
= in_be32(addr
);
183 if (EEH_POSSIBLE_ERROR(val
, u32
))
184 return eeh_check_failure(addr
, val
);
187 static inline void eeh_raw_writel(u32 val
, volatile void __iomem
*addr
)
192 static inline u64
eeh_readq(const volatile void __iomem
*addr
)
194 u64 val
= in_le64(addr
);
195 if (EEH_POSSIBLE_ERROR(val
, u64
))
196 return eeh_check_failure(addr
, val
);
199 static inline void eeh_writeq(u64 val
, volatile void __iomem
*addr
)
203 static inline u64
eeh_raw_readq(const volatile void __iomem
*addr
)
205 u64 val
= in_be64(addr
);
206 if (EEH_POSSIBLE_ERROR(val
, u64
))
207 return eeh_check_failure(addr
, val
);
210 static inline void eeh_raw_writeq(u64 val
, volatile void __iomem
*addr
)
215 #define EEH_CHECK_ALIGN(v,a) \
216 ((((unsigned long)(v)) & ((a) - 1)) == 0)
218 static inline void eeh_memset_io(volatile void __iomem
*addr
, int c
,
221 void *p
= (void __force
*)addr
;
226 while(n
&& !EEH_CHECK_ALIGN(p
, 4)) {
227 *((volatile u8
*)p
) = c
;
232 *((volatile u32
*)p
) = lc
;
237 *((volatile u8
*)p
) = c
;
241 __asm__
__volatile__ ("sync" : : : "memory");
243 static inline void eeh_memcpy_fromio(void *dest
, const volatile void __iomem
*src
,
246 void *vsrc
= (void __force
*) src
;
247 void *destsave
= dest
;
248 unsigned long nsave
= n
;
250 while(n
&& (!EEH_CHECK_ALIGN(vsrc
, 4) || !EEH_CHECK_ALIGN(dest
, 4))) {
251 *((u8
*)dest
) = *((volatile u8
*)vsrc
);
252 __asm__
__volatile__ ("eieio" : : : "memory");
258 *((u32
*)dest
) = *((volatile u32
*)vsrc
);
259 __asm__
__volatile__ ("eieio" : : : "memory");
265 *((u8
*)dest
) = *((volatile u8
*)vsrc
);
266 __asm__
__volatile__ ("eieio" : : : "memory");
271 __asm__
__volatile__ ("sync" : : : "memory");
273 /* Look for ffff's here at dest[n]. Assume that at least 4 bytes
274 * were copied. Check all four bytes.
277 (EEH_POSSIBLE_ERROR((*((u32
*) destsave
+nsave
-4)), u32
))) {
278 eeh_check_failure(src
, (*((u32
*) destsave
+nsave
-4)));
282 static inline void eeh_memcpy_toio(volatile void __iomem
*dest
, const void *src
,
285 void *vdest
= (void __force
*) dest
;
287 while(n
&& (!EEH_CHECK_ALIGN(vdest
, 4) || !EEH_CHECK_ALIGN(src
, 4))) {
288 *((volatile u8
*)vdest
) = *((u8
*)src
);
294 *((volatile u32
*)vdest
) = *((volatile u32
*)src
);
300 *((volatile u8
*)vdest
) = *((u8
*)src
);
305 __asm__
__volatile__ ("sync" : : : "memory");
308 #undef EEH_CHECK_ALIGN
310 static inline u8
eeh_inb(unsigned long port
)
313 if (!_IO_IS_VALID(port
))
315 val
= in_8((u8 __iomem
*)(port
+pci_io_base
));
316 if (EEH_POSSIBLE_ERROR(val
, u8
))
317 return eeh_check_failure((void __iomem
*)(port
), val
);
321 static inline void eeh_outb(u8 val
, unsigned long port
)
323 if (_IO_IS_VALID(port
))
324 out_8((u8 __iomem
*)(port
+pci_io_base
), val
);
327 static inline u16
eeh_inw(unsigned long port
)
330 if (!_IO_IS_VALID(port
))
332 val
= in_le16((u16 __iomem
*)(port
+pci_io_base
));
333 if (EEH_POSSIBLE_ERROR(val
, u16
))
334 return eeh_check_failure((void __iomem
*)(port
), val
);
338 static inline void eeh_outw(u16 val
, unsigned long port
)
340 if (_IO_IS_VALID(port
))
341 out_le16((u16 __iomem
*)(port
+pci_io_base
), val
);
344 static inline u32
eeh_inl(unsigned long port
)
347 if (!_IO_IS_VALID(port
))
349 val
= in_le32((u32 __iomem
*)(port
+pci_io_base
));
350 if (EEH_POSSIBLE_ERROR(val
, u32
))
351 return eeh_check_failure((void __iomem
*)(port
), val
);
355 static inline void eeh_outl(u32 val
, unsigned long port
)
357 if (_IO_IS_VALID(port
))
358 out_le32((u32 __iomem
*)(port
+pci_io_base
), val
);
361 /* in-string eeh macros */
362 static inline void eeh_insb(unsigned long port
, void * buf
, int ns
)
364 _insb((u8 __iomem
*)(port
+pci_io_base
), buf
, ns
);
365 if (EEH_POSSIBLE_ERROR((*(((u8
*)buf
)+ns
-1)), u8
))
366 eeh_check_failure((void __iomem
*)(port
), *(u8
*)buf
);
369 static inline void eeh_insw_ns(unsigned long port
, void * buf
, int ns
)
371 _insw_ns((u16 __iomem
*)(port
+pci_io_base
), buf
, ns
);
372 if (EEH_POSSIBLE_ERROR((*(((u16
*)buf
)+ns
-1)), u16
))
373 eeh_check_failure((void __iomem
*)(port
), *(u16
*)buf
);
376 static inline void eeh_insl_ns(unsigned long port
, void * buf
, int nl
)
378 _insl_ns((u32 __iomem
*)(port
+pci_io_base
), buf
, nl
);
379 if (EEH_POSSIBLE_ERROR((*(((u32
*)buf
)+nl
-1)), u32
))
380 eeh_check_failure((void __iomem
*)(port
), *(u32
*)buf
);
383 #endif /* __KERNEL__ */
384 #endif /* _PPC64_EEH_H */