eeh.h 9.3 KB

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  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. #ifndef _PPC64_EEH_H
  20. #define _PPC64_EEH_H
  21. #include <linux/config.h>
  22. #include <linux/init.h>
  23. #include <linux/list.h>
  24. #include <linux/string.h>
  25. struct pci_dev;
  26. struct device_node;
  27. #ifdef CONFIG_EEH
  28. /* Values for eeh_mode bits in device_node */
  29. #define EEH_MODE_SUPPORTED (1<<0)
  30. #define EEH_MODE_NOCHECK (1<<1)
  31. #define EEH_MODE_ISOLATED (1<<2)
  32. /* Max number of EEH freezes allowed before we consider the device
  33. * to be permanently disabled. */
  34. #define EEH_MAX_ALLOWED_FREEZES 5
  35. void __init eeh_init(void);
  36. unsigned long eeh_check_failure(const volatile void __iomem *token,
  37. unsigned long val);
  38. int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
  39. void __init pci_addr_cache_build(void);
  40. /**
  41. * eeh_add_device_early
  42. * eeh_add_device_late
  43. *
  44. * Perform eeh initialization for devices added after boot.
  45. * Call eeh_add_device_early before doing any i/o to the
  46. * device (including config space i/o). Call eeh_add_device_late
  47. * to finish the eeh setup for this device.
  48. */
  49. void eeh_add_device_early(struct device_node *);
  50. void eeh_add_device_late(struct pci_dev *);
  51. /**
  52. * eeh_remove_device - undo EEH setup for the indicated pci device
  53. * @dev: pci device to be removed
  54. *
  55. * This routine should be called when a device is removed from
  56. * a running system (e.g. by hotplug or dlpar). It unregisters
  57. * the PCI device from the EEH subsystem. I/O errors affecting
  58. * this device will no longer be detected after this call; thus,
  59. * i/o errors affecting this slot may leave this device unusable.
  60. */
  61. void eeh_remove_device(struct pci_dev *);
  62. /**
  63. * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
  64. *
  65. * If this macro yields TRUE, the caller relays to eeh_check_failure()
  66. * which does further tests out of line.
  67. */
  68. #define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0)
  69. /*
  70. * Reads from a device which has been isolated by EEH will return
  71. * all 1s. This macro gives an all-1s value of the given size (in
  72. * bytes: 1, 2, or 4) for comparing with the result of a read.
  73. */
  74. #define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8))
  75. #else /* !CONFIG_EEH */
  76. static inline void eeh_init(void) { }
  77. static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
  78. {
  79. return val;
  80. }
  81. static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
  82. {
  83. return 0;
  84. }
  85. static inline void pci_addr_cache_build(void) { }
  86. static inline void eeh_add_device_early(struct device_node *dn) { }
  87. static inline void eeh_add_device_late(struct pci_dev *dev) { }
  88. static inline void eeh_remove_device(struct pci_dev *dev) { }
  89. #define EEH_POSSIBLE_ERROR(val, type) (0)
  90. #define EEH_IO_ERROR_VALUE(size) (-1UL)
  91. #endif /* CONFIG_EEH */
  92. /*
  93. * MMIO read/write operations with EEH support.
  94. */
  95. static inline u8 eeh_readb(const volatile void __iomem *addr)
  96. {
  97. u8 val = in_8(addr);
  98. if (EEH_POSSIBLE_ERROR(val, u8))
  99. return eeh_check_failure(addr, val);
  100. return val;
  101. }
  102. static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
  103. {
  104. out_8(addr, val);
  105. }
  106. static inline u16 eeh_readw(const volatile void __iomem *addr)
  107. {
  108. u16 val = in_le16(addr);
  109. if (EEH_POSSIBLE_ERROR(val, u16))
  110. return eeh_check_failure(addr, val);
  111. return val;
  112. }
  113. static inline void eeh_writew(u16 val, volatile void __iomem *addr)
  114. {
  115. out_le16(addr, val);
  116. }
  117. static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
  118. {
  119. u16 val = in_be16(addr);
  120. if (EEH_POSSIBLE_ERROR(val, u16))
  121. return eeh_check_failure(addr, val);
  122. return val;
  123. }
  124. static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
  125. volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
  126. out_be16(vaddr, val);
  127. }
  128. static inline u32 eeh_readl(const volatile void __iomem *addr)
  129. {
  130. u32 val = in_le32(addr);
  131. if (EEH_POSSIBLE_ERROR(val, u32))
  132. return eeh_check_failure(addr, val);
  133. return val;
  134. }
  135. static inline void eeh_writel(u32 val, volatile void __iomem *addr)
  136. {
  137. out_le32(addr, val);
  138. }
  139. static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
  140. {
  141. u32 val = in_be32(addr);
  142. if (EEH_POSSIBLE_ERROR(val, u32))
  143. return eeh_check_failure(addr, val);
  144. return val;
  145. }
  146. static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
  147. {
  148. out_be32(addr, val);
  149. }
  150. static inline u64 eeh_readq(const volatile void __iomem *addr)
  151. {
  152. u64 val = in_le64(addr);
  153. if (EEH_POSSIBLE_ERROR(val, u64))
  154. return eeh_check_failure(addr, val);
  155. return val;
  156. }
  157. static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
  158. {
  159. out_le64(addr, val);
  160. }
  161. static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
  162. {
  163. u64 val = in_be64(addr);
  164. if (EEH_POSSIBLE_ERROR(val, u64))
  165. return eeh_check_failure(addr, val);
  166. return val;
  167. }
  168. static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
  169. {
  170. out_be64(addr, val);
  171. }
  172. #define EEH_CHECK_ALIGN(v,a) \
  173. ((((unsigned long)(v)) & ((a) - 1)) == 0)
  174. static inline void eeh_memset_io(volatile void __iomem *addr, int c,
  175. unsigned long n)
  176. {
  177. void *p = (void __force *)addr;
  178. u32 lc = c;
  179. lc |= lc << 8;
  180. lc |= lc << 16;
  181. while(n && !EEH_CHECK_ALIGN(p, 4)) {
  182. *((volatile u8 *)p) = c;
  183. p++;
  184. n--;
  185. }
  186. while(n >= 4) {
  187. *((volatile u32 *)p) = lc;
  188. p += 4;
  189. n -= 4;
  190. }
  191. while(n) {
  192. *((volatile u8 *)p) = c;
  193. p++;
  194. n--;
  195. }
  196. __asm__ __volatile__ ("sync" : : : "memory");
  197. }
  198. static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
  199. unsigned long n)
  200. {
  201. void *vsrc = (void __force *) src;
  202. void *destsave = dest;
  203. unsigned long nsave = n;
  204. while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
  205. *((u8 *)dest) = *((volatile u8 *)vsrc);
  206. __asm__ __volatile__ ("eieio" : : : "memory");
  207. vsrc++;
  208. dest++;
  209. n--;
  210. }
  211. while(n > 4) {
  212. *((u32 *)dest) = *((volatile u32 *)vsrc);
  213. __asm__ __volatile__ ("eieio" : : : "memory");
  214. vsrc += 4;
  215. dest += 4;
  216. n -= 4;
  217. }
  218. while(n) {
  219. *((u8 *)dest) = *((volatile u8 *)vsrc);
  220. __asm__ __volatile__ ("eieio" : : : "memory");
  221. vsrc++;
  222. dest++;
  223. n--;
  224. }
  225. __asm__ __volatile__ ("sync" : : : "memory");
  226. /* Look for ffff's here at dest[n]. Assume that at least 4 bytes
  227. * were copied. Check all four bytes.
  228. */
  229. if ((nsave >= 4) &&
  230. (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
  231. eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
  232. }
  233. }
  234. static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
  235. unsigned long n)
  236. {
  237. void *vdest = (void __force *) dest;
  238. while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
  239. *((volatile u8 *)vdest) = *((u8 *)src);
  240. src++;
  241. vdest++;
  242. n--;
  243. }
  244. while(n > 4) {
  245. *((volatile u32 *)vdest) = *((volatile u32 *)src);
  246. src += 4;
  247. vdest += 4;
  248. n-=4;
  249. }
  250. while(n) {
  251. *((volatile u8 *)vdest) = *((u8 *)src);
  252. src++;
  253. vdest++;
  254. n--;
  255. }
  256. __asm__ __volatile__ ("sync" : : : "memory");
  257. }
  258. #undef EEH_CHECK_ALIGN
  259. static inline u8 eeh_inb(unsigned long port)
  260. {
  261. u8 val;
  262. if (!_IO_IS_VALID(port))
  263. return ~0;
  264. val = in_8((u8 __iomem *)(port+pci_io_base));
  265. if (EEH_POSSIBLE_ERROR(val, u8))
  266. return eeh_check_failure((void __iomem *)(port), val);
  267. return val;
  268. }
  269. static inline void eeh_outb(u8 val, unsigned long port)
  270. {
  271. if (_IO_IS_VALID(port))
  272. out_8((u8 __iomem *)(port+pci_io_base), val);
  273. }
  274. static inline u16 eeh_inw(unsigned long port)
  275. {
  276. u16 val;
  277. if (!_IO_IS_VALID(port))
  278. return ~0;
  279. val = in_le16((u16 __iomem *)(port+pci_io_base));
  280. if (EEH_POSSIBLE_ERROR(val, u16))
  281. return eeh_check_failure((void __iomem *)(port), val);
  282. return val;
  283. }
  284. static inline void eeh_outw(u16 val, unsigned long port)
  285. {
  286. if (_IO_IS_VALID(port))
  287. out_le16((u16 __iomem *)(port+pci_io_base), val);
  288. }
  289. static inline u32 eeh_inl(unsigned long port)
  290. {
  291. u32 val;
  292. if (!_IO_IS_VALID(port))
  293. return ~0;
  294. val = in_le32((u32 __iomem *)(port+pci_io_base));
  295. if (EEH_POSSIBLE_ERROR(val, u32))
  296. return eeh_check_failure((void __iomem *)(port), val);
  297. return val;
  298. }
  299. static inline void eeh_outl(u32 val, unsigned long port)
  300. {
  301. if (_IO_IS_VALID(port))
  302. out_le32((u32 __iomem *)(port+pci_io_base), val);
  303. }
  304. /* in-string eeh macros */
  305. static inline void eeh_insb(unsigned long port, void * buf, int ns)
  306. {
  307. _insb((u8 __iomem *)(port+pci_io_base), buf, ns);
  308. if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
  309. eeh_check_failure((void __iomem *)(port), *(u8*)buf);
  310. }
  311. static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
  312. {
  313. _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
  314. if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
  315. eeh_check_failure((void __iomem *)(port), *(u16*)buf);
  316. }
  317. static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
  318. {
  319. _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
  320. if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
  321. eeh_check_failure((void __iomem *)(port), *(u32*)buf);
  322. }
  323. #endif /* _PPC64_EEH_H */