1 files changed, 366 insertions, 0 deletions

diff --git a/include/asm-powerpc/eeh.h b/include/asm-powerpc/eeh.h
new file mode 100644
index 000000000000..f8633aafe4ba
--- /dev/null
+++ b/include/asm-powerpc/eeh.h
@@ -0,0 +1,366 @@
+/*
+ * 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
+
+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)
+
+/* 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 && 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_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 */