include/asm-powerpc/eeh.h

   1 /*
   2  * eeh.h
   3  * Copyright (C) 2001  Dave Engebretsen & Todd Inglett IBM Corporation.
   4  *
   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.
   9  *
  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.
  14  *
  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
  18  */
  19
  20 #ifndef _PPC64_EEH_H
  21 #define _PPC64_EEH_H
  22 #ifdef __KERNEL__
  23
  24 #include <linux/config.h>
  25 #include <linux/init.h>
  26 #include <linux/list.h>
  27 #include <linux/string.h>
  28
  29 struct pci_dev;
  30 struct device_node;
  31
  32 #ifdef CONFIG_EEH
  33
  34 extern int eeh_subsystem_enabled;
  35
  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)
  40
  41 /* Max number of EEH freezes allowed before we consider the device
  42  * to be permanently disabled. */
  43 #define EEH_MAX_ALLOWED_FREEZES 5
  44
  45 void __init eeh_init(void);
  46 unsigned long eeh_check_failure(const volatile void __iomem *token,
  47                                 unsigned long val);
  48 int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
  49 void __init pci_addr_cache_build(void);
  50
  51 /**
  52  * eeh_add_device_early
  53  * eeh_add_device_late
  54  *
  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.
  59  */
  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 *);
  63
  64 /**
  65  * eeh_remove_device - undo EEH setup for the indicated pci device
  66  * @dev: pci device to be removed
  67  *
  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.
  73  */
  74 void eeh_remove_device(struct pci_dev *);
  75
  76 /**
  77  * eeh_remove_device_recursive - undo EEH for device & children.
  78  * @dev: pci device to be removed
  79  *
  80  * As above, this removes the device; it also removes child
  81  * pci devices as well.
  82  */
  83 void eeh_remove_bus_device(struct pci_dev *);
  84
  85 /**
  86  * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
  87  *
  88  * If this macro yields TRUE, the caller relays to eeh_check_failure()
  89  * which does further tests out of line.
  90  */
  91 #define EEH_POSSIBLE_ERROR(val, type)   ((val) == (type)~0 && eeh_subsystem_enabled)
  92
  93 /*
  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.
  97  */
  98 #define EEH_IO_ERROR_VALUE(size)        (~0U >> ((4 - (size)) * 8))
  99
 100 #else /* !CONFIG_EEH */
 101 static inline void eeh_init(void) { }
 102
 103 static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
 104 {
 105         return val;
 106 }
 107
 108 static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
 109 {
 110         return 0;
 111 }
 112
 113 static inline void pci_addr_cache_build(void) { }
 114
 115 static inline void eeh_add_device_early(struct device_node *dn) { }
 116
 117 static inline void eeh_add_device_late(struct pci_dev *dev) { }
 118
 119 static inline void eeh_remove_device(struct pci_dev *dev) { }
 120
 121 static inline void eeh_add_device_tree_early(struct device_node *dn) { }
 122
 123 static inline void eeh_remove_bus_device(struct pci_dev *dev) { }
 124 #define EEH_POSSIBLE_ERROR(val, type) (0)
 125 #define EEH_IO_ERROR_VALUE(size) (-1UL)
 126 #endif /* CONFIG_EEH */
 127
 128 /*
 129  * MMIO read/write operations with EEH support.
 130  */
 131 static inline u8 eeh_readb(const volatile void __iomem *addr)
 132 {
 133         u8 val = in_8(addr);
 134         if (EEH_POSSIBLE_ERROR(val, u8))
 135                 return eeh_check_failure(addr, val);
 136         return val;
 137 }
 138 static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
 139 {
 140         out_8(addr, val);
 141 }
 142
 143 static inline u16 eeh_readw(const volatile void __iomem *addr)
 144 {
 145         u16 val = in_le16(addr);
 146         if (EEH_POSSIBLE_ERROR(val, u16))
 147                 return eeh_check_failure(addr, val);
 148         return val;
 149 }
 150 static inline void eeh_writew(u16 val, volatile void __iomem *addr)
 151 {
 152         out_le16(addr, val);
 153 }
 154 static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
 155 {
 156         u16 val = in_be16(addr);
 157         if (EEH_POSSIBLE_ERROR(val, u16))
 158                 return eeh_check_failure(addr, val);
 159         return val;
 160 }
 161 static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
 162         volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
 163         out_be16(vaddr, val);
 164 }
 165
 166 static inline u32 eeh_readl(const volatile void __iomem *addr)
 167 {
 168         u32 val = in_le32(addr);
 169         if (EEH_POSSIBLE_ERROR(val, u32))
 170                 return eeh_check_failure(addr, val);
 171         return val;
 172 }
 173 static inline void eeh_writel(u32 val, volatile void __iomem *addr)
 174 {
 175         out_le32(addr, val);
 176 }
 177 static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
 178 {
 179         u32 val = in_be32(addr);
 180         if (EEH_POSSIBLE_ERROR(val, u32))
 181                 return eeh_check_failure(addr, val);
 182         return val;
 183 }
 184 static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
 185 {
 186         out_be32(addr, val);
 187 }
 188
 189 static inline u64 eeh_readq(const volatile void __iomem *addr)
 190 {
 191         u64 val = in_le64(addr);
 192         if (EEH_POSSIBLE_ERROR(val, u64))
 193                 return eeh_check_failure(addr, val);
 194         return val;
 195 }
 196 static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
 197 {
 198         out_le64(addr, val);
 199 }
 200 static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
 201 {
 202         u64 val = in_be64(addr);
 203         if (EEH_POSSIBLE_ERROR(val, u64))
 204                 return eeh_check_failure(addr, val);
 205         return val;
 206 }
 207 static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
 208 {
 209         out_be64(addr, val);
 210 }
 211
 212 #define EEH_CHECK_ALIGN(v,a) \
 213         ((((unsigned long)(v)) & ((a) - 1)) == 0)
 214
 215 static inline void eeh_memset_io(volatile void __iomem *addr, int c,
 216                                  unsigned long n)
 217 {
 218         void *p = (void __force *)addr;
 219         u32 lc = c;
 220         lc |= lc << 8;
 221         lc |= lc << 16;
 222
 223         while(n && !EEH_CHECK_ALIGN(p, 4)) {
 224                 *((volatile u8 *)p) = c;
 225                 p++;
 226                 n--;
 227         }
 228         while(n >= 4) {
 229                 *((volatile u32 *)p) = lc;
 230                 p += 4;
 231                 n -= 4;
 232         }
 233         while(n) {
 234                 *((volatile u8 *)p) = c;
 235                 p++;
 236                 n--;
 237         }
 238         __asm__ __volatile__ ("sync" : : : "memory");
 239 }
 240 static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
 241                                      unsigned long n)
 242 {
 243         void *vsrc = (void __force *) src;
 244         void *destsave = dest;
 245         unsigned long nsave = n;
 246
 247         while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
 248                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 249                 __asm__ __volatile__ ("eieio" : : : "memory");
 250                 vsrc++;
 251                 dest++;
 252                 n--;
 253         }
 254         while(n > 4) {
 255                 *((u32 *)dest) = *((volatile u32 *)vsrc);
 256                 __asm__ __volatile__ ("eieio" : : : "memory");
 257                 vsrc += 4;
 258                 dest += 4;
 259                 n -= 4;
 260         }
 261         while(n) {
 262                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 263                 __asm__ __volatile__ ("eieio" : : : "memory");
 264                 vsrc++;
 265                 dest++;
 266                 n--;
 267         }
 268         __asm__ __volatile__ ("sync" : : : "memory");
 269
 270         /* Look for ffff's here at dest[n].  Assume that at least 4 bytes
 271          * were copied. Check all four bytes.
 272          */
 273         if ((nsave >= 4) &&
 274                 (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
 275                 eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
 276         }
 277 }
 278
 279 static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
 280                                    unsigned long n)
 281 {
 282         void *vdest = (void __force *) dest;
 283
 284         while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
 285                 *((volatile u8 *)vdest) = *((u8 *)src);
 286                 src++;
 287                 vdest++;
 288                 n--;
 289         }
 290         while(n > 4) {
 291                 *((volatile u32 *)vdest) = *((volatile u32 *)src);
 292                 src += 4;
 293                 vdest += 4;
 294                 n-=4;
 295         }
 296         while(n) {
 297                 *((volatile u8 *)vdest) = *((u8 *)src);
 298                 src++;
 299                 vdest++;
 300                 n--;
 301         }
 302         __asm__ __volatile__ ("sync" : : : "memory");
 303 }
 304
 305 #undef EEH_CHECK_ALIGN
 306
 307 static inline u8 eeh_inb(unsigned long port)
 308 {
 309         u8 val;
 310         if (!_IO_IS_VALID(port))
 311                 return ~0;
 312         val = in_8((u8 __iomem *)(port+pci_io_base));
 313         if (EEH_POSSIBLE_ERROR(val, u8))
 314                 return eeh_check_failure((void __iomem *)(port), val);
 315         return val;
 316 }
 317
 318 static inline void eeh_outb(u8 val, unsigned long port)
 319 {
 320         if (_IO_IS_VALID(port))
 321                 out_8((u8 __iomem *)(port+pci_io_base), val);
 322 }
 323
 324 static inline u16 eeh_inw(unsigned long port)
 325 {
 326         u16 val;
 327         if (!_IO_IS_VALID(port))
 328                 return ~0;
 329         val = in_le16((u16 __iomem *)(port+pci_io_base));
 330         if (EEH_POSSIBLE_ERROR(val, u16))
 331                 return eeh_check_failure((void __iomem *)(port), val);
 332         return val;
 333 }
 334
 335 static inline void eeh_outw(u16 val, unsigned long port)
 336 {
 337         if (_IO_IS_VALID(port))
 338                 out_le16((u16 __iomem *)(port+pci_io_base), val);
 339 }
 340
 341 static inline u32 eeh_inl(unsigned long port)
 342 {
 343         u32 val;
 344         if (!_IO_IS_VALID(port))
 345                 return ~0;
 346         val = in_le32((u32 __iomem *)(port+pci_io_base));
 347         if (EEH_POSSIBLE_ERROR(val, u32))
 348                 return eeh_check_failure((void __iomem *)(port), val);
 349         return val;
 350 }
 351
 352 static inline void eeh_outl(u32 val, unsigned long port)
 353 {
 354         if (_IO_IS_VALID(port))
 355                 out_le32((u32 __iomem *)(port+pci_io_base), val);
 356 }
 357
 358 /* in-string eeh macros */
 359 static inline void eeh_insb(unsigned long port, void * buf, int ns)
 360 {
 361         _insb((u8 __iomem *)(port+pci_io_base), buf, ns);
 362         if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
 363                 eeh_check_failure((void __iomem *)(port), *(u8*)buf);
 364 }
 365
 366 static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
 367 {
 368         _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
 369         if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
 370                 eeh_check_failure((void __iomem *)(port), *(u16*)buf);
 371 }
 372
 373 static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
 374 {
 375         _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
 376         if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
 377                 eeh_check_failure((void __iomem *)(port), *(u32*)buf);
 378 }
 379
 380 #endif /* __KERNEL__ */
 381 #endif /* _PPC64_EEH_H */