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>
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)
41 /* Max number of EEH freezes allowed before we consider the device
42 * to be permanently disabled. */
43 #define EEH_MAX_ALLOWED_FREEZES 5
45 void __init eeh_init(void);
46 unsigned long eeh_check_failure(const volatile void __iomem *token,
48 int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
49 void __init pci_addr_cache_build(void);
52 * eeh_add_device_early
55 * Perform eeh initialization for devices added after boot.
56 * Call eeh_add_device_early before doing any i/o to the
57 * device (including config space i/o). Call eeh_add_device_late
58 * to finish the eeh setup for this device.
60 void eeh_add_device_early(struct device_node *);
61 void eeh_add_device_tree_early(struct device_node *);
62 void eeh_add_device_late(struct pci_dev *);
65 * eeh_remove_device - undo EEH setup for the indicated pci device
66 * @dev: pci device to be removed
68 * This routine should be called when a device is removed from
69 * a running system (e.g. by hotplug or dlpar). It unregisters
70 * the PCI device from the EEH subsystem. I/O errors affecting
71 * this device will no longer be detected after this call; thus,
72 * i/o errors affecting this slot may leave this device unusable.
74 void eeh_remove_device(struct pci_dev *);
77 * eeh_remove_device_recursive - undo EEH for device & children.
78 * @dev: pci device to be removed
80 * As above, this removes the device; it also removes child
81 * pci devices as well.
83 void eeh_remove_bus_device(struct pci_dev *);
86 * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
88 * If this macro yields TRUE, the caller relays to eeh_check_failure()
89 * which does further tests out of line.
91 #define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0 && eeh_subsystem_enabled)
94 * Reads from a device which has been isolated by EEH will return
95 * all 1s. This macro gives an all-1s value of the given size (in
96 * bytes: 1, 2, or 4) for comparing with the result of a read.
98 #define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8))
100 #else /* !CONFIG_EEH */
101 static inline void eeh_init(void) { }
103 static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
108 static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
113 static inline void pci_addr_cache_build(void) { }
115 static inline void eeh_add_device_early(struct device_node *dn) { }
117 static inline void eeh_add_device_late(struct pci_dev *dev) { }
119 static inline void eeh_remove_device(struct pci_dev *dev) { }
121 #define EEH_POSSIBLE_ERROR(val, type) (0)
122 #define EEH_IO_ERROR_VALUE(size) (-1UL)
123 #endif /* CONFIG_EEH */
126 * MMIO read/write operations with EEH support.
128 static inline u8 eeh_readb(const volatile void __iomem *addr)
131 if (EEH_POSSIBLE_ERROR(val, u8))
132 return eeh_check_failure(addr, val);
135 static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
140 static inline u16 eeh_readw(const volatile void __iomem *addr)
142 u16 val = in_le16(addr);
143 if (EEH_POSSIBLE_ERROR(val, u16))
144 return eeh_check_failure(addr, val);
147 static inline void eeh_writew(u16 val, volatile void __iomem *addr)
151 static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
153 u16 val = in_be16(addr);
154 if (EEH_POSSIBLE_ERROR(val, u16))
155 return eeh_check_failure(addr, val);
158 static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
159 volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
160 out_be16(vaddr, val);
163 static inline u32 eeh_readl(const volatile void __iomem *addr)
165 u32 val = in_le32(addr);
166 if (EEH_POSSIBLE_ERROR(val, u32))
167 return eeh_check_failure(addr, val);
170 static inline void eeh_writel(u32 val, volatile void __iomem *addr)
174 static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
176 u32 val = in_be32(addr);
177 if (EEH_POSSIBLE_ERROR(val, u32))
178 return eeh_check_failure(addr, val);
181 static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
186 static inline u64 eeh_readq(const volatile void __iomem *addr)
188 u64 val = in_le64(addr);
189 if (EEH_POSSIBLE_ERROR(val, u64))
190 return eeh_check_failure(addr, val);
193 static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
197 static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
199 u64 val = in_be64(addr);
200 if (EEH_POSSIBLE_ERROR(val, u64))
201 return eeh_check_failure(addr, val);
204 static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
209 #define EEH_CHECK_ALIGN(v,a) \
210 ((((unsigned long)(v)) & ((a) - 1)) == 0)
212 static inline void eeh_memset_io(volatile void __iomem *addr, int c,
215 void *p = (void __force *)addr;
220 while(n && !EEH_CHECK_ALIGN(p, 4)) {
221 *((volatile u8 *)p) = c;
226 *((volatile u32 *)p) = lc;
231 *((volatile u8 *)p) = c;
235 __asm__ __volatile__ ("sync" : : : "memory");
237 static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
240 void *vsrc = (void __force *) src;
241 void *destsave = dest;
242 unsigned long nsave = n;
244 while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
245 *((u8 *)dest) = *((volatile u8 *)vsrc);
246 __asm__ __volatile__ ("eieio" : : : "memory");
252 *((u32 *)dest) = *((volatile u32 *)vsrc);
253 __asm__ __volatile__ ("eieio" : : : "memory");
259 *((u8 *)dest) = *((volatile u8 *)vsrc);
260 __asm__ __volatile__ ("eieio" : : : "memory");
265 __asm__ __volatile__ ("sync" : : : "memory");
267 /* Look for ffff's here at dest[n]. Assume that at least 4 bytes
268 * were copied. Check all four bytes.
271 (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
272 eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
276 static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
279 void *vdest = (void __force *) dest;
281 while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
282 *((volatile u8 *)vdest) = *((u8 *)src);
288 *((volatile u32 *)vdest) = *((volatile u32 *)src);
294 *((volatile u8 *)vdest) = *((u8 *)src);
299 __asm__ __volatile__ ("sync" : : : "memory");
302 #undef EEH_CHECK_ALIGN
304 static inline u8 eeh_inb(unsigned long port)
307 if (!_IO_IS_VALID(port))
309 val = in_8((u8 __iomem *)(port+pci_io_base));
310 if (EEH_POSSIBLE_ERROR(val, u8))
311 return eeh_check_failure((void __iomem *)(port), val);
315 static inline void eeh_outb(u8 val, unsigned long port)
317 if (_IO_IS_VALID(port))
318 out_8((u8 __iomem *)(port+pci_io_base), val);
321 static inline u16 eeh_inw(unsigned long port)
324 if (!_IO_IS_VALID(port))
326 val = in_le16((u16 __iomem *)(port+pci_io_base));
327 if (EEH_POSSIBLE_ERROR(val, u16))
328 return eeh_check_failure((void __iomem *)(port), val);
332 static inline void eeh_outw(u16 val, unsigned long port)
334 if (_IO_IS_VALID(port))
335 out_le16((u16 __iomem *)(port+pci_io_base), val);
338 static inline u32 eeh_inl(unsigned long port)
341 if (!_IO_IS_VALID(port))
343 val = in_le32((u32 __iomem *)(port+pci_io_base));
344 if (EEH_POSSIBLE_ERROR(val, u32))
345 return eeh_check_failure((void __iomem *)(port), val);
349 static inline void eeh_outl(u32 val, unsigned long port)
351 if (_IO_IS_VALID(port))
352 out_le32((u32 __iomem *)(port+pci_io_base), val);
355 /* in-string eeh macros */
356 static inline void eeh_insb(unsigned long port, void * buf, int ns)
358 _insb((u8 __iomem *)(port+pci_io_base), buf, ns);
359 if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
360 eeh_check_failure((void __iomem *)(port), *(u8*)buf);
363 static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
365 _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
366 if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
367 eeh_check_failure((void __iomem *)(port), *(u16*)buf);
370 static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
372 _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
373 if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
374 eeh_check_failure((void __iomem *)(port), *(u32*)buf);
377 #endif /* __KERNEL__ */
378 #endif /* _PPC64_EEH_H */