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
23 #include <linux/config.h>
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/string.h>
33 /* Values for eeh_mode bits in device_node */
34 #define EEH_MODE_SUPPORTED (1<<0)
35 #define EEH_MODE_NOCHECK (1<<1)
36 #define EEH_MODE_ISOLATED (1<<2)
38 /* Max number of EEH freezes allowed before we consider the device
39 * to be permanently disabled. */
40 #define EEH_MAX_ALLOWED_FREEZES 5
42 void __init eeh_init(void);
43 unsigned long eeh_check_failure(const volatile void __iomem *token,
45 int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
46 void __init pci_addr_cache_build(void);
49 * eeh_add_device_early
52 * Perform eeh initialization for devices added after boot.
53 * Call eeh_add_device_early before doing any i/o to the
54 * device (including config space i/o). Call eeh_add_device_late
55 * to finish the eeh setup for this device.
57 void eeh_add_device_early(struct device_node *);
58 void eeh_add_device_late(struct pci_dev *);
61 * eeh_remove_device - undo EEH setup for the indicated pci device
62 * @dev: pci device to be removed
64 * This routine should be called when a device is removed from
65 * a running system (e.g. by hotplug or dlpar). It unregisters
66 * the PCI device from the EEH subsystem. I/O errors affecting
67 * this device will no longer be detected after this call; thus,
68 * i/o errors affecting this slot may leave this device unusable.
70 void eeh_remove_device(struct pci_dev *);
73 * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
75 * If this macro yields TRUE, the caller relays to eeh_check_failure()
76 * which does further tests out of line.
78 #define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0)
81 * Reads from a device which has been isolated by EEH will return
82 * all 1s. This macro gives an all-1s value of the given size (in
83 * bytes: 1, 2, or 4) for comparing with the result of a read.
85 #define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8))
87 #else /* !CONFIG_EEH */
88 static inline void eeh_init(void) { }
90 static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
95 static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
100 static inline void pci_addr_cache_build(void) { }
102 static inline void eeh_add_device_early(struct device_node *dn) { }
104 static inline void eeh_add_device_late(struct pci_dev *dev) { }
106 static inline void eeh_remove_device(struct pci_dev *dev) { }
108 #define EEH_POSSIBLE_ERROR(val, type) (0)
109 #define EEH_IO_ERROR_VALUE(size) (-1UL)
110 #endif /* CONFIG_EEH */
113 * MMIO read/write operations with EEH support.
115 static inline u8 eeh_readb(const volatile void __iomem *addr)
118 if (EEH_POSSIBLE_ERROR(val, u8))
119 return eeh_check_failure(addr, val);
122 static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
127 static inline u16 eeh_readw(const volatile void __iomem *addr)
129 u16 val = in_le16(addr);
130 if (EEH_POSSIBLE_ERROR(val, u16))
131 return eeh_check_failure(addr, val);
134 static inline void eeh_writew(u16 val, volatile void __iomem *addr)
138 static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
140 u16 val = in_be16(addr);
141 if (EEH_POSSIBLE_ERROR(val, u16))
142 return eeh_check_failure(addr, val);
145 static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
146 volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
147 out_be16(vaddr, val);
150 static inline u32 eeh_readl(const volatile void __iomem *addr)
152 u32 val = in_le32(addr);
153 if (EEH_POSSIBLE_ERROR(val, u32))
154 return eeh_check_failure(addr, val);
157 static inline void eeh_writel(u32 val, volatile void __iomem *addr)
161 static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
163 u32 val = in_be32(addr);
164 if (EEH_POSSIBLE_ERROR(val, u32))
165 return eeh_check_failure(addr, val);
168 static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
173 static inline u64 eeh_readq(const volatile void __iomem *addr)
175 u64 val = in_le64(addr);
176 if (EEH_POSSIBLE_ERROR(val, u64))
177 return eeh_check_failure(addr, val);
180 static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
184 static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
186 u64 val = in_be64(addr);
187 if (EEH_POSSIBLE_ERROR(val, u64))
188 return eeh_check_failure(addr, val);
191 static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
196 #define EEH_CHECK_ALIGN(v,a) \
197 ((((unsigned long)(v)) & ((a) - 1)) == 0)
199 static inline void eeh_memset_io(volatile void __iomem *addr, int c,
202 void *p = (void __force *)addr;
207 while(n && !EEH_CHECK_ALIGN(p, 4)) {
208 *((volatile u8 *)p) = c;
213 *((volatile u32 *)p) = lc;
218 *((volatile u8 *)p) = c;
222 __asm__ __volatile__ ("sync" : : : "memory");
224 static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
227 void *vsrc = (void __force *) src;
228 void *destsave = dest;
229 unsigned long nsave = n;
231 while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
232 *((u8 *)dest) = *((volatile u8 *)vsrc);
233 __asm__ __volatile__ ("eieio" : : : "memory");
239 *((u32 *)dest) = *((volatile u32 *)vsrc);
240 __asm__ __volatile__ ("eieio" : : : "memory");
246 *((u8 *)dest) = *((volatile u8 *)vsrc);
247 __asm__ __volatile__ ("eieio" : : : "memory");
252 __asm__ __volatile__ ("sync" : : : "memory");
254 /* Look for ffff's here at dest[n]. Assume that at least 4 bytes
255 * were copied. Check all four bytes.
258 (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
259 eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
263 static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
266 void *vdest = (void __force *) dest;
268 while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
269 *((volatile u8 *)vdest) = *((u8 *)src);
275 *((volatile u32 *)vdest) = *((volatile u32 *)src);
281 *((volatile u8 *)vdest) = *((u8 *)src);
286 __asm__ __volatile__ ("sync" : : : "memory");
289 #undef EEH_CHECK_ALIGN
291 static inline u8 eeh_inb(unsigned long port)
294 if (!_IO_IS_VALID(port))
296 val = in_8((u8 __iomem *)(port+pci_io_base));
297 if (EEH_POSSIBLE_ERROR(val, u8))
298 return eeh_check_failure((void __iomem *)(port), val);
302 static inline void eeh_outb(u8 val, unsigned long port)
304 if (_IO_IS_VALID(port))
305 out_8((u8 __iomem *)(port+pci_io_base), val);
308 static inline u16 eeh_inw(unsigned long port)
311 if (!_IO_IS_VALID(port))
313 val = in_le16((u16 __iomem *)(port+pci_io_base));
314 if (EEH_POSSIBLE_ERROR(val, u16))
315 return eeh_check_failure((void __iomem *)(port), val);
319 static inline void eeh_outw(u16 val, unsigned long port)
321 if (_IO_IS_VALID(port))
322 out_le16((u16 __iomem *)(port+pci_io_base), val);
325 static inline u32 eeh_inl(unsigned long port)
328 if (!_IO_IS_VALID(port))
330 val = in_le32((u32 __iomem *)(port+pci_io_base));
331 if (EEH_POSSIBLE_ERROR(val, u32))
332 return eeh_check_failure((void __iomem *)(port), val);
336 static inline void eeh_outl(u32 val, unsigned long port)
338 if (_IO_IS_VALID(port))
339 out_le32((u32 __iomem *)(port+pci_io_base), val);
342 /* in-string eeh macros */
343 static inline void eeh_insb(unsigned long port, void * buf, int ns)
345 _insb((u8 __iomem *)(port+pci_io_base), buf, ns);
346 if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
347 eeh_check_failure((void __iomem *)(port), *(u8*)buf);
350 static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
352 _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
353 if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
354 eeh_check_failure((void __iomem *)(port), *(u16*)buf);
357 static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
359 _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
360 if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
361 eeh_check_failure((void __iomem *)(port), *(u32*)buf);
364 #endif /* _PPC64_EEH_H */