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_late(struct pci_dev *dev);
65 void eeh_add_device_tree_early(struct device_node *);
66 void eeh_add_device_tree_late(struct pci_bus *);
69 * eeh_remove_device - undo EEH setup for the indicated pci device
70 * @dev: pci device to be removed
72 * This routine should be called when a device is removed from
73 * a running system (e.g. by hotplug or dlpar). It unregisters
74 * the PCI device from the EEH subsystem. I/O errors affecting
75 * this device will no longer be detected after this call; thus,
76 * i/o errors affecting this slot may leave this device unusable.
78 void eeh_remove_device(struct pci_dev *);
81 * eeh_remove_device_recursive - undo EEH for device & children.
82 * @dev: pci device to be removed
84 * As above, this removes the device; it also removes child
85 * pci devices as well.
87 void eeh_remove_bus_device(struct pci_dev *);
90 * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
92 * If this macro yields TRUE, the caller relays to eeh_check_failure()
93 * which does further tests out of line.
95 #define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0 && eeh_subsystem_enabled)
98 * Reads from a device which has been isolated by EEH will return
99 * all 1s. This macro gives an all-1s value of the given size (in
100 * bytes: 1, 2, or 4) for comparing with the result of a read.
102 #define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8))
104 #else /* !CONFIG_EEH */
105 static inline void eeh_init(void) { }
107 static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
112 static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
117 static inline void pci_addr_cache_build(void) { }
119 static inline void eeh_add_device_early(struct device_node *dn) { }
121 static inline void eeh_remove_device(struct pci_dev *dev) { }
123 static inline void eeh_add_device_tree_early(struct device_node *dn) { }
125 static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }
127 static inline void eeh_remove_bus_device(struct pci_dev *dev) { }
128 #define EEH_POSSIBLE_ERROR(val, type) (0)
129 #define EEH_IO_ERROR_VALUE(size) (-1UL)
130 #endif /* CONFIG_EEH */
133 * MMIO read/write operations with EEH support.
135 static inline u8 eeh_readb(const volatile void __iomem *addr)
138 if (EEH_POSSIBLE_ERROR(val, u8))
139 return eeh_check_failure(addr, val);
142 static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
147 static inline u16 eeh_readw(const volatile void __iomem *addr)
149 u16 val = in_le16(addr);
150 if (EEH_POSSIBLE_ERROR(val, u16))
151 return eeh_check_failure(addr, val);
154 static inline void eeh_writew(u16 val, volatile void __iomem *addr)
158 static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
160 u16 val = in_be16(addr);
161 if (EEH_POSSIBLE_ERROR(val, u16))
162 return eeh_check_failure(addr, val);
165 static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
166 volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
167 out_be16(vaddr, val);
170 static inline u32 eeh_readl(const volatile void __iomem *addr)
172 u32 val = in_le32(addr);
173 if (EEH_POSSIBLE_ERROR(val, u32))
174 return eeh_check_failure(addr, val);
177 static inline void eeh_writel(u32 val, volatile void __iomem *addr)
181 static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
183 u32 val = in_be32(addr);
184 if (EEH_POSSIBLE_ERROR(val, u32))
185 return eeh_check_failure(addr, val);
188 static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
193 static inline u64 eeh_readq(const volatile void __iomem *addr)
195 u64 val = in_le64(addr);
196 if (EEH_POSSIBLE_ERROR(val, u64))
197 return eeh_check_failure(addr, val);
200 static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
204 static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
206 u64 val = in_be64(addr);
207 if (EEH_POSSIBLE_ERROR(val, u64))
208 return eeh_check_failure(addr, val);
211 static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
216 #define EEH_CHECK_ALIGN(v,a) \
217 ((((unsigned long)(v)) & ((a) - 1)) == 0)
219 static inline void eeh_memset_io(volatile void __iomem *addr, int c,
222 void *p = (void __force *)addr;
227 while(n && !EEH_CHECK_ALIGN(p, 4)) {
228 *((volatile u8 *)p) = c;
233 *((volatile u32 *)p) = lc;
238 *((volatile u8 *)p) = c;
242 __asm__ __volatile__ ("sync" : : : "memory");
244 static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
247 void *vsrc = (void __force *) src;
248 void *destsave = dest;
249 unsigned long nsave = n;
251 while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
252 *((u8 *)dest) = *((volatile u8 *)vsrc);
253 __asm__ __volatile__ ("eieio" : : : "memory");
259 *((u32 *)dest) = *((volatile u32 *)vsrc);
260 __asm__ __volatile__ ("eieio" : : : "memory");
266 *((u8 *)dest) = *((volatile u8 *)vsrc);
267 __asm__ __volatile__ ("eieio" : : : "memory");
272 __asm__ __volatile__ ("sync" : : : "memory");
274 /* Look for ffff's here at dest[n]. Assume that at least 4 bytes
275 * were copied. Check all four bytes.
278 (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
279 eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
283 static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
286 void *vdest = (void __force *) dest;
288 while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
289 *((volatile u8 *)vdest) = *((u8 *)src);
295 *((volatile u32 *)vdest) = *((volatile u32 *)src);
301 *((volatile u8 *)vdest) = *((u8 *)src);
306 __asm__ __volatile__ ("sync" : : : "memory");
309 #undef EEH_CHECK_ALIGN
311 static inline u8 eeh_inb(unsigned long port)
314 if (!_IO_IS_VALID(port))
316 val = in_8((u8 __iomem *)(port+pci_io_base));
317 if (EEH_POSSIBLE_ERROR(val, u8))
318 return eeh_check_failure((void __iomem *)(port), val);
322 static inline void eeh_outb(u8 val, unsigned long port)
324 if (_IO_IS_VALID(port))
325 out_8((u8 __iomem *)(port+pci_io_base), val);
328 static inline u16 eeh_inw(unsigned long port)
331 if (!_IO_IS_VALID(port))
333 val = in_le16((u16 __iomem *)(port+pci_io_base));
334 if (EEH_POSSIBLE_ERROR(val, u16))
335 return eeh_check_failure((void __iomem *)(port), val);
339 static inline void eeh_outw(u16 val, unsigned long port)
341 if (_IO_IS_VALID(port))
342 out_le16((u16 __iomem *)(port+pci_io_base), val);
345 static inline u32 eeh_inl(unsigned long port)
348 if (!_IO_IS_VALID(port))
350 val = in_le32((u32 __iomem *)(port+pci_io_base));
351 if (EEH_POSSIBLE_ERROR(val, u32))
352 return eeh_check_failure((void __iomem *)(port), val);
356 static inline void eeh_outl(u32 val, unsigned long port)
358 if (_IO_IS_VALID(port))
359 out_le32((u32 __iomem *)(port+pci_io_base), val);
362 /* in-string eeh macros */
363 static inline void eeh_insb(unsigned long port, void * buf, int ns)
365 _insb((u8 __iomem *)(port+pci_io_base), buf, ns);
366 if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
367 eeh_check_failure((void __iomem *)(port), *(u8*)buf);
370 static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
372 _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
373 if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
374 eeh_check_failure((void __iomem *)(port), *(u16*)buf);
377 static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
379 _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
380 if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
381 eeh_check_failure((void __iomem *)(port), *(u32*)buf);
384 #endif /* __KERNEL__ */
385 #endif /* _PPC64_EEH_H */