aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-powerpc/eeh.h
blob: 868c7139dbfff8db6d6730db3900e0ccce6add4d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
/*
 * eeh.h
 * Copyright (C) 2001  Dave Engebretsen & Todd Inglett IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#ifndef _PPC64_EEH_H
#define _PPC64_EEH_H
#ifdef __KERNEL__

#include <linux/config.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/string.h>

struct pci_dev;
struct pci_bus;
struct device_node;

#ifdef CONFIG_EEH

extern int eeh_subsystem_enabled;

/* Values for eeh_mode bits in device_node */
#define EEH_MODE_SUPPORTED     (1<<0)
#define EEH_MODE_NOCHECK       (1<<1)
#define EEH_MODE_ISOLATED      (1<<2)
#define EEH_MODE_RECOVERING    (1<<3)
#define EEH_MODE_IRQ_DISABLED  (1<<4)

/* Max number of EEH freezes allowed before we consider the device
 * to be permanently disabled. */
#define EEH_MAX_ALLOWED_FREEZES 5

void __init eeh_init(void);
unsigned long eeh_check_failure(const volatile void __iomem *token,
				unsigned long val);
int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
void __init pci_addr_cache_build(void);

/**
 * eeh_add_device_early
 * eeh_add_device_late
 *
 * Perform eeh initialization for devices added after boot.
 * Call eeh_add_device_early before doing any i/o to the
 * device (including config space i/o).  Call eeh_add_device_late
 * to finish the eeh setup for this device.
 */
void eeh_add_device_tree_early(struct device_node *);
void eeh_add_device_tree_late(struct pci_bus *);

/**
 * eeh_remove_device_recursive - undo EEH for device & children.
 * @dev: pci device to be removed
 *
 * As above, this removes the device; it also removes child
 * pci devices as well.
 */
void eeh_remove_bus_device(struct pci_dev *);

/**
 * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
 *
 * If this macro yields TRUE, the caller relays to eeh_check_failure()
 * which does further tests out of line.
 */
#define EEH_POSSIBLE_ERROR(val, type)	((val) == (type)~0 && eeh_subsystem_enabled)

/*
 * Reads from a device which has been isolated by EEH will return
 * all 1s.  This macro gives an all-1s value of the given size (in
 * bytes: 1, 2, or 4) for comparing with the result of a read.
 */
#define EEH_IO_ERROR_VALUE(size)	(~0U >> ((4 - (size)) * 8))

#else /* !CONFIG_EEH */
static inline void eeh_init(void) { }

static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
{
	return val;
}

static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
{
	return 0;
}

static inline void pci_addr_cache_build(void) { }

static inline void eeh_add_device_tree_early(struct device_node *dn) { }

static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }

static inline void eeh_remove_bus_device(struct pci_dev *dev) { }
#define EEH_POSSIBLE_ERROR(val, type) (0)
#define EEH_IO_ERROR_VALUE(size) (-1UL)
#endif /* CONFIG_EEH */

/*
 * MMIO read/write operations with EEH support.
 */
static inline u8 eeh_readb(const volatile void __iomem *addr)
{
	u8 val = in_8(addr);
	if (EEH_POSSIBLE_ERROR(val, u8))
		return eeh_check_failure(addr, val);
	return val;
}
static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
{
	out_8(addr, val);
}

static inline u16 eeh_readw(const volatile void __iomem *addr)
{
	u16 val = in_le16(addr);
	if (EEH_POSSIBLE_ERROR(val, u16))
		return eeh_check_failure(addr, val);
	return val;
}
static inline void eeh_writew(u16 val, volatile void __iomem *addr)
{
	out_le16(addr, val);
}
static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
{
	u16 val = in_be16(addr);
	if (EEH_POSSIBLE_ERROR(val, u16))
		return eeh_check_failure(addr, val);
	return val;
}
static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
	volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
	out_be16(vaddr, val);
}

static inline u32 eeh_readl(const volatile void __iomem *addr)
{
	u32 val = in_le32(addr);
	if (EEH_POSSIBLE_ERROR(val, u32))
		return eeh_check_failure(addr, val);
	return val;
}
static inline void eeh_writel(u32 val, volatile void __iomem *addr)
{
	out_le32(addr, val);
}
static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
{
	u32 val = in_be32(addr);
	if (EEH_POSSIBLE_ERROR(val, u32))
		return eeh_check_failure(addr, val);
	return val;
}
static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
{
	out_be32(addr, val);
}

static inline u64 eeh_readq(const volatile void __iomem *addr)
{
	u64 val = in_le64(addr);
	if (EEH_POSSIBLE_ERROR(val, u64))
		return eeh_check_failure(addr, val);
	return val;
}
static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
{
	out_le64(addr, val);
}
static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
{
	u64 val = in_be64(addr);
	if (EEH_POSSIBLE_ERROR(val, u64))
		return eeh_check_failure(addr, val);
	return val;
}
static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
{
	out_be64(addr, val);
}

#define EEH_CHECK_ALIGN(v,a) \
	((((unsigned long)(v)) & ((a) - 1)) == 0)

static inline void eeh_memset_io(volatile void __iomem *addr, int c,
				 unsigned long n)
{
	void *p = (void __force *)addr;
	u32 lc = c;
	lc |= lc << 8;
	lc |= lc << 16;

	while(n && !EEH_CHECK_ALIGN(p, 4)) {
		*((volatile u8 *)p) = c;
		p++;
		n--;
	}
	while(n >= 4) {
		*((volatile u32 *)p) = lc;
		p += 4;
		n -= 4;
	}
	while(n) {
		*((volatile u8 *)p) = c;
		p++;
		n--;
	}
	__asm__ __volatile__ ("sync" : : : "memory");
}
static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
				     unsigned long n)
{
	void *vsrc = (void __force *) src;
	void *destsave = dest;
	unsigned long nsave = n;

	while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
		*((u8 *)dest) = *((volatile u8 *)vsrc);
		__asm__ __volatile__ ("eieio" : : : "memory");
		vsrc++;
		dest++;
		n--;
	}
	while(n > 4) {
		*((u32 *)dest) = *((volatile u32 *)vsrc);
		__asm__ __volatile__ ("eieio" : : : "memory");
		vsrc += 4;
		dest += 4;
		n -= 4;
	}
	while(n) {
		*((u8 *)dest) = *((volatile u8 *)vsrc);
		__asm__ __volatile__ ("eieio" : : : "memory");
		vsrc++;
		dest++;
		n--;
	}
	__asm__ __volatile__ ("sync" : : : "memory");

	/* Look for ffff's here at dest[n].  Assume that at least 4 bytes
	 * were copied. Check all four bytes.
	 */
	if ((nsave >= 4) &&
		(EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
		eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
	}
}

static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
				   unsigned long n)
{
	void *vdest = (void __force *) dest;

	while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
		*((volatile u8 *)vdest) = *((u8 *)src);
		src++;
		vdest++;
		n--;
	}
	while(n > 4) {
		*((volatile u32 *)vdest) = *((volatile u32 *)src);
		src += 4;
		vdest += 4;
		n-=4;
	}
	while(n) {
		*((volatile u8 *)vdest) = *((u8 *)src);
		src++;
		vdest++;
		n--;
	}
	__asm__ __volatile__ ("sync" : : : "memory");
}

#undef EEH_CHECK_ALIGN

static inline u8 eeh_inb(unsigned long port)
{
	u8 val;
	if (!_IO_IS_VALID(port))
		return ~0;
	val = in_8((u8 __iomem *)(port+pci_io_base));
	if (EEH_POSSIBLE_ERROR(val, u8))
		return eeh_check_failure((void __iomem *)(port), val);
	return val;
}

static inline void eeh_outb(u8 val, unsigned long port)
{
	if (_IO_IS_VALID(port))
		out_8((u8 __iomem *)(port+pci_io_base), val);
}

static inline u16 eeh_inw(unsigned long port)
{
	u16 val;
	if (!_IO_IS_VALID(port))
		return ~0;
	val = in_le16((u16 __iomem *)(port+pci_io_base));
	if (EEH_POSSIBLE_ERROR(val, u16))
		return eeh_check_failure((void __iomem *)(port), val);
	return val;
}

static inline void eeh_outw(u16 val, unsigned long port)
{
	if (_IO_IS_VALID(port))
		out_le16((u16 __iomem *)(port+pci_io_base), val);
}

static inline u32 eeh_inl(unsigned long port)
{
	u32 val;
	if (!_IO_IS_VALID(port))
		return ~0;
	val = in_le32((u32 __iomem *)(port+pci_io_base));
	if (EEH_POSSIBLE_ERROR(val, u32))
		return eeh_check_failure((void __iomem *)(port), val);
	return val;
}

static inline void eeh_outl(u32 val, unsigned long port)
{
	if (_IO_IS_VALID(port))
		out_le32((u32 __iomem *)(port+pci_io_base), val);
}

/* in-string eeh macros */
static inline void eeh_insb(unsigned long port, void * buf, int ns)
{
	_insb((u8 __iomem *)(port+pci_io_base), buf, ns);
	if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
		eeh_check_failure((void __iomem *)(port), *(u8*)buf);
}

static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
{
	_insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
	if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
		eeh_check_failure((void __iomem *)(port), *(u16*)buf);
}

static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
{
	_insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
	if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
		eeh_check_failure((void __iomem *)(port), *(u32*)buf);
}

#endif /* __KERNEL__ */
#endif /* _PPC64_EEH_H */