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/init.h>
  25 #include <linux/list.h>
  26 #include <linux/string.h>
  27
  28 struct pci_dev;
  29 struct pci_bus;
  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 #define EEH_MODE_RECOVERING    (1<<3)
  41 #define EEH_MODE_IRQ_DISABLED  (1<<4)
  42
  43 /* Max number of EEH freezes allowed before we consider the device
  44  * to be permanently disabled. */
  45 #define EEH_MAX_ALLOWED_FREEZES 5
  46
  47 void __init eeh_init(void);
  48 unsigned long eeh_check_failure(const volatile void __iomem *token,
  49                                 unsigned long val);
  50 int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
  51 void __init pci_addr_cache_build(void);
  52
  53 /**
  54  * eeh_add_device_early
  55  * eeh_add_device_late
  56  *
  57  * Perform eeh initialization for devices added after boot.
  58  * Call eeh_add_device_early before doing any i/o to the
  59  * device (including config space i/o).  Call eeh_add_device_late
  60  * to finish the eeh setup for this device.
  61  */
  62 void eeh_add_device_tree_early(struct device_node *);
  63 void eeh_add_device_tree_late(struct pci_bus *);
  64
  65 /**
  66  * eeh_remove_device_recursive - undo EEH for device & children.
  67  * @dev: pci device to be removed
  68  *
  69  * As above, this removes the device; it also removes child
  70  * pci devices as well.
  71  */
  72 void eeh_remove_bus_device(struct pci_dev *);
  73
  74 /**
  75  * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
  76  *
  77  * If this macro yields TRUE, the caller relays to eeh_check_failure()
  78  * which does further tests out of line.
  79  */
  80 #define EEH_POSSIBLE_ERROR(val, type)   ((val) == (type)~0 && eeh_subsystem_enabled)
  81
  82 /*
  83  * Reads from a device which has been isolated by EEH will return
  84  * all 1s.  This macro gives an all-1s value of the given size (in
  85  * bytes: 1, 2, or 4) for comparing with the result of a read.
  86  */
  87 #define EEH_IO_ERROR_VALUE(size)        (~0U >> ((4 - (size)) * 8))
  88
  89 #else /* !CONFIG_EEH */
  90 static inline void eeh_init(void) { }
  91
  92 static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
  93 {
  94         return val;
  95 }
  96
  97 static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
  98 {
  99         return 0;
 100 }
 101
 102 static inline void pci_addr_cache_build(void) { }
 103
 104 static inline void eeh_add_device_tree_early(struct device_node *dn) { }
 105
 106 static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }
 107
 108 static inline void eeh_remove_bus_device(struct pci_dev *dev) { }
 109 #define EEH_POSSIBLE_ERROR(val, type) (0)
 110 #define EEH_IO_ERROR_VALUE(size) (-1UL)
 111 #endif /* CONFIG_EEH */
 112
 113 /*
 114  * MMIO read/write operations with EEH support.
 115  */
 116 static inline u8 eeh_readb(const volatile void __iomem *addr)
 117 {
 118         u8 val = in_8(addr);
 119         if (EEH_POSSIBLE_ERROR(val, u8))
 120                 return eeh_check_failure(addr, val);
 121         return val;
 122 }
 123 static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
 124 {
 125         out_8(addr, val);
 126 }
 127
 128 static inline u16 eeh_readw(const volatile void __iomem *addr)
 129 {
 130         u16 val = in_le16(addr);
 131         if (EEH_POSSIBLE_ERROR(val, u16))
 132                 return eeh_check_failure(addr, val);
 133         return val;
 134 }
 135 static inline void eeh_writew(u16 val, volatile void __iomem *addr)
 136 {
 137         out_le16(addr, val);
 138 }
 139 static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
 140 {
 141         u16 val = in_be16(addr);
 142         if (EEH_POSSIBLE_ERROR(val, u16))
 143                 return eeh_check_failure(addr, val);
 144         return val;
 145 }
 146 static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
 147         volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
 148         out_be16(vaddr, val);
 149 }
 150
 151 static inline u32 eeh_readl(const volatile void __iomem *addr)
 152 {
 153         u32 val = in_le32(addr);
 154         if (EEH_POSSIBLE_ERROR(val, u32))
 155                 return eeh_check_failure(addr, val);
 156         return val;
 157 }
 158 static inline void eeh_writel(u32 val, volatile void __iomem *addr)
 159 {
 160         out_le32(addr, val);
 161 }
 162 static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
 163 {
 164         u32 val = in_be32(addr);
 165         if (EEH_POSSIBLE_ERROR(val, u32))
 166                 return eeh_check_failure(addr, val);
 167         return val;
 168 }
 169 static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
 170 {
 171         out_be32(addr, val);
 172 }
 173
 174 static inline u64 eeh_readq(const volatile void __iomem *addr)
 175 {
 176         u64 val = in_le64(addr);
 177         if (EEH_POSSIBLE_ERROR(val, u64))
 178                 return eeh_check_failure(addr, val);
 179         return val;
 180 }
 181 static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
 182 {
 183         out_le64(addr, val);
 184 }
 185 static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
 186 {
 187         u64 val = in_be64(addr);
 188         if (EEH_POSSIBLE_ERROR(val, u64))
 189                 return eeh_check_failure(addr, val);
 190         return val;
 191 }
 192 static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
 193 {
 194         out_be64(addr, val);
 195 }
 196
 197 #define EEH_CHECK_ALIGN(v,a) \
 198         ((((unsigned long)(v)) & ((a) - 1)) == 0)
 199
 200 static inline void eeh_memset_io(volatile void __iomem *addr, int c,
 201                                  unsigned long n)
 202 {
 203         void *p = (void __force *)addr;
 204         u32 lc = c;
 205         lc |= lc << 8;
 206         lc |= lc << 16;
 207
 208         __asm__ __volatile__ ("sync" : : : "memory");
 209         while(n && !EEH_CHECK_ALIGN(p, 4)) {
 210                 *((volatile u8 *)p) = c;
 211                 p++;
 212                 n--;
 213         }
 214         while(n >= 4) {
 215                 *((volatile u32 *)p) = lc;
 216                 p += 4;
 217                 n -= 4;
 218         }
 219         while(n) {
 220                 *((volatile u8 *)p) = c;
 221                 p++;
 222                 n--;
 223         }
 224         __asm__ __volatile__ ("sync" : : : "memory");
 225 }
 226 static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
 227                                      unsigned long n)
 228 {
 229         void *vsrc = (void __force *) src;
 230         void *destsave = dest;
 231         unsigned long nsave = n;
 232
 233         __asm__ __volatile__ ("sync" : : : "memory");
 234         while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
 235                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 236                 __asm__ __volatile__ ("eieio" : : : "memory");
 237                 vsrc++;
 238                 dest++;
 239                 n--;
 240         }
 241         while(n > 4) {
 242                 *((u32 *)dest) = *((volatile u32 *)vsrc);
 243                 __asm__ __volatile__ ("eieio" : : : "memory");
 244                 vsrc += 4;
 245                 dest += 4;
 246                 n -= 4;
 247         }
 248         while(n) {
 249                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 250                 __asm__ __volatile__ ("eieio" : : : "memory");
 251                 vsrc++;
 252                 dest++;
 253                 n--;
 254         }
 255         __asm__ __volatile__ ("sync" : : : "memory");
 256
 257         /* Look for ffff's here at dest[n].  Assume that at least 4 bytes
 258          * were copied. Check all four bytes.
 259          */
 260         if ((nsave >= 4) &&
 261                 (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
 262                 eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
 263         }
 264 }
 265
 266 static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
 267                                    unsigned long n)
 268 {
 269         void *vdest = (void __force *) dest;
 270
 271         __asm__ __volatile__ ("sync" : : : "memory");
 272         while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
 273                 *((volatile u8 *)vdest) = *((u8 *)src);
 274                 src++;
 275                 vdest++;
 276                 n--;
 277         }
 278         while(n > 4) {
 279                 *((volatile u32 *)vdest) = *((volatile u32 *)src);
 280                 src += 4;
 281                 vdest += 4;
 282                 n-=4;
 283         }
 284         while(n) {
 285                 *((volatile u8 *)vdest) = *((u8 *)src);
 286                 src++;
 287                 vdest++;
 288                 n--;
 289         }
 290         __asm__ __volatile__ ("sync" : : : "memory");
 291 }
 292
 293 #undef EEH_CHECK_ALIGN
 294
 295 static inline u8 eeh_inb(unsigned long port)
 296 {
 297         u8 val;
 298         val = in_8((u8 __iomem *)(port+pci_io_base));
 299         if (EEH_POSSIBLE_ERROR(val, u8))
 300                 return eeh_check_failure((void __iomem *)(port), val);
 301         return val;
 302 }
 303
 304 static inline void eeh_outb(u8 val, unsigned long port)
 305 {
 306         out_8((u8 __iomem *)(port+pci_io_base), val);
 307 }
 308
 309 static inline u16 eeh_inw(unsigned long port)
 310 {
 311         u16 val;
 312         val = in_le16((u16 __iomem *)(port+pci_io_base));
 313         if (EEH_POSSIBLE_ERROR(val, u16))
 314                 return eeh_check_failure((void __iomem *)(port), val);
 315         return val;
 316 }
 317
 318 static inline void eeh_outw(u16 val, unsigned long port)
 319 {
 320         out_le16((u16 __iomem *)(port+pci_io_base), val);
 321 }
 322
 323 static inline u32 eeh_inl(unsigned long port)
 324 {
 325         u32 val;
 326         val = in_le32((u32 __iomem *)(port+pci_io_base));
 327         if (EEH_POSSIBLE_ERROR(val, u32))
 328                 return eeh_check_failure((void __iomem *)(port), val);
 329         return val;
 330 }
 331
 332 static inline void eeh_outl(u32 val, unsigned long port)
 333 {
 334         out_le32((u32 __iomem *)(port+pci_io_base), val);
 335 }
 336
 337 /* in-string eeh macros */
 338 static inline void eeh_insb(unsigned long port, void * buf, int ns)
 339 {
 340         _insb((u8 __iomem *)(port+pci_io_base), buf, ns);
 341         if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
 342                 eeh_check_failure((void __iomem *)(port), *(u8*)buf);
 343 }
 344
 345 static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
 346 {
 347         _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
 348         if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
 349                 eeh_check_failure((void __iomem *)(port), *(u16*)buf);
 350 }
 351
 352 static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
 353 {
 354         _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
 355         if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
 356                 eeh_check_failure((void __iomem *)(port), *(u32*)buf);
 357 }
 358
 359 #endif /* __KERNEL__ */
 360 #endif /* _PPC64_EEH_H */