1 files changed, 364 insertions, 0 deletions
diff --git a/include/asm-powerpc/eeh.h b/include/asm-powerpc/eeh.h
new file mode 100644
index 000000000000..89f26ab31908
--- /dev/null
+++ b/include/asm-powerpc/eeh.h
@@ -0,0 +1,364 @@
+/*
+ * 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
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/string.h>
+
+struct pci_dev;
+struct device_node;
+
+#ifdef CONFIG_EEH
+
+/* 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)
+
+/* 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_early(struct device_node *);
+void eeh_add_device_late(struct pci_dev *);
+
+/**
+ * eeh_remove_device - undo EEH setup for the indicated pci device
+ * @dev: pci device to be removed
+ *
+ * This routine should be called when a device is removed from
+ * a running system (e.g. by hotplug or dlpar).  It unregisters
+ * the PCI device from the EEH subsystem.  I/O errors affecting
+ * this device will no longer be detected after this call; thus,
+ * i/o errors affecting this slot may leave this device unusable.
+ */
+void eeh_remove_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)
+
+/*
+ * 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_early(struct device_node *dn) { }
+
+static inline void eeh_add_device_late(struct pci_dev *dev) { }
+
+static inline void eeh_remove_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 /* _PPC64_EEH_H */