1 files changed, 484 insertions, 0 deletions

diff --git a/include/asm-ia64/io.h b/include/asm-ia64/io.h
new file mode 100644
index 000000000000..491e9d1fc538
--- /dev/null
+++ b/include/asm-ia64/io.h
@@ -0,0 +1,484 @@
+#ifndef _ASM_IA64_IO_H
+#define _ASM_IA64_IO_H
+
+/*
+ * This file contains the definitions for the emulated IO instructions
+ * inb/inw/inl/outb/outw/outl and the "string versions" of the same
+ * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
+ * versions of the single-IO instructions (inb_p/inw_p/..).
+ *
+ * This file is not meant to be obfuscating: it's just complicated to
+ * (a) handle it all in a way that makes gcc able to optimize it as
+ * well as possible and (b) trying to avoid writing the same thing
+ * over and over again with slight variations and possibly making a
+ * mistake somewhere.
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *      David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ */
+
+/* We don't use IO slowdowns on the ia64, but.. */
+#define __SLOW_DOWN_IO  do { } while (0)
+#define SLOW_DOWN_IO    do { } while (0)
+
+#define __IA64_UNCACHED_OFFSET  0xc000000000000000UL    /* region 6 */
+
+/*
+ * The legacy I/O space defined by the ia64 architecture supports only 65536 ports, but
+ * large machines may have multiple other I/O spaces so we can't place any a priori limit
+ * on IO_SPACE_LIMIT.  These additional spaces are described in ACPI.
+ */
+#define IO_SPACE_LIMIT          0xffffffffffffffffUL
+
+#define MAX_IO_SPACES_BITS              4
+#define MAX_IO_SPACES                   (1UL << MAX_IO_SPACES_BITS)
+#define IO_SPACE_BITS                   24
+#define IO_SPACE_SIZE                   (1UL << IO_SPACE_BITS)
+
+#define IO_SPACE_NR(port)               ((port) >> IO_SPACE_BITS)
+#define IO_SPACE_BASE(space)            ((space) << IO_SPACE_BITS)
+#define IO_SPACE_PORT(port)             ((port) & (IO_SPACE_SIZE - 1))
+
+#define IO_SPACE_SPARSE_ENCODING(p)     ((((p) >> 2) << 12) | (p & 0xfff))
+
+struct io_space {
+        unsigned long mmio_base;        /* base in MMIO space */
+        int sparse;
+};
+
+extern struct io_space io_space[];
+extern unsigned int num_io_spaces;
+
+# ifdef __KERNEL__
+
+/*
+ * All MMIO iomem cookies are in region 6; anything less is a PIO cookie:
+ *      0xCxxxxxxxxxxxxxxx      MMIO cookie (return from ioremap)
+ *      0x000000001SPPPPPP      PIO cookie (S=space number, P..P=port)
+ *
+ * ioread/writeX() uses the leading 1 in PIO cookies (PIO_OFFSET) to catch
+ * code that uses bare port numbers without the prerequisite pci_iomap().
+ */
+#define PIO_OFFSET              (1UL << (MAX_IO_SPACES_BITS + IO_SPACE_BITS))
+#define PIO_MASK                (PIO_OFFSET - 1)
+#define PIO_RESERVED            __IA64_UNCACHED_OFFSET
+#define HAVE_ARCH_PIO_SIZE
+
+#include <asm/intrinsics.h>
+#include <asm/machvec.h>
+#include <asm/page.h>
+#include <asm/system.h>
+#include <asm-generic/iomap.h>
+
+/*
+ * Change virtual addresses to physical addresses and vv.
+ */
+static inline unsigned long
+virt_to_phys (volatile void *address)
+{
+        return (unsigned long) address - PAGE_OFFSET;
+}
+
+static inline void*
+phys_to_virt (unsigned long address)
+{
+        return (void *) (address + PAGE_OFFSET);
+}
+
+#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
+extern int valid_phys_addr_range (unsigned long addr, size_t *count); /* efi.c */
+
+/*
+ * The following two macros are deprecated and scheduled for removal.
+ * Please use the PCI-DMA interface defined in <asm/pci.h> instead.
+ */
+#define bus_to_virt     phys_to_virt
+#define virt_to_bus     virt_to_phys
+#define page_to_bus     page_to_phys
+
+# endif /* KERNEL */
+
+/*
+ * Memory fence w/accept.  This should never be used in code that is
+ * not IA-64 specific.
+ */
+#define __ia64_mf_a()   ia64_mfa()
+
+/**
+ * ___ia64_mmiowb - I/O write barrier
+ *
+ * Ensure ordering of I/O space writes.  This will make sure that writes
+ * following the barrier will arrive after all previous writes.  For most
+ * ia64 platforms, this is a simple 'mf.a' instruction.
+ *
+ * See Documentation/DocBook/deviceiobook.tmpl for more information.
+ */
+static inline void ___ia64_mmiowb(void)
+{
+        ia64_mfa();
+}
+
+static inline const unsigned long
+__ia64_get_io_port_base (void)
+{
+        extern unsigned long ia64_iobase;
+
+        return ia64_iobase;
+}
+
+static inline void*
+__ia64_mk_io_addr (unsigned long port)
+{
+        struct io_space *space;
+        unsigned long offset;
+
+        space = &io_space[IO_SPACE_NR(port)];
+        port = IO_SPACE_PORT(port);
+        if (space->sparse)
+                offset = IO_SPACE_SPARSE_ENCODING(port);
+        else
+                offset = port;
+
+        return (void *) (space->mmio_base | offset);
+}
+
+#define __ia64_inb      ___ia64_inb
+#define __ia64_inw      ___ia64_inw
+#define __ia64_inl      ___ia64_inl
+#define __ia64_outb     ___ia64_outb
+#define __ia64_outw     ___ia64_outw
+#define __ia64_outl     ___ia64_outl
+#define __ia64_readb    ___ia64_readb
+#define __ia64_readw    ___ia64_readw
+#define __ia64_readl    ___ia64_readl
+#define __ia64_readq    ___ia64_readq
+#define __ia64_readb_relaxed    ___ia64_readb
+#define __ia64_readw_relaxed    ___ia64_readw
+#define __ia64_readl_relaxed    ___ia64_readl
+#define __ia64_readq_relaxed    ___ia64_readq
+#define __ia64_writeb   ___ia64_writeb
+#define __ia64_writew   ___ia64_writew
+#define __ia64_writel   ___ia64_writel
+#define __ia64_writeq   ___ia64_writeq
+#define __ia64_mmiowb   ___ia64_mmiowb
+
+/*
+ * For the in/out routines, we need to do "mf.a" _after_ doing the I/O access to ensure
+ * that the access has completed before executing other I/O accesses.  Since we're doing
+ * the accesses through an uncachable (UC) translation, the CPU will execute them in
+ * program order.  However, we still need to tell the compiler not to shuffle them around
+ * during optimization, which is why we use "volatile" pointers.
+ */
+
+static inline unsigned int
+___ia64_inb (unsigned long port)
+{
+        volatile unsigned char *addr = __ia64_mk_io_addr(port);
+        unsigned char ret;
+
+        ret = *addr;
+        __ia64_mf_a();
+        return ret;
+}
+
+static inline unsigned int
+___ia64_inw (unsigned long port)
+{
+        volatile unsigned short *addr = __ia64_mk_io_addr(port);
+        unsigned short ret;
+
+        ret = *addr;
+        __ia64_mf_a();
+        return ret;
+}
+
+static inline unsigned int
+___ia64_inl (unsigned long port)
+{
+        volatile unsigned int *addr = __ia64_mk_io_addr(port);
+        unsigned int ret;
+
+        ret = *addr;
+        __ia64_mf_a();
+        return ret;
+}
+
+static inline void
+___ia64_outb (unsigned char val, unsigned long port)
+{
+        volatile unsigned char *addr = __ia64_mk_io_addr(port);
+
+        *addr = val;
+        __ia64_mf_a();
+}
+
+static inline void
+___ia64_outw (unsigned short val, unsigned long port)
+{
+        volatile unsigned short *addr = __ia64_mk_io_addr(port);
+
+        *addr = val;
+        __ia64_mf_a();
+}
+
+static inline void
+___ia64_outl (unsigned int val, unsigned long port)
+{
+        volatile unsigned int *addr = __ia64_mk_io_addr(port);
+
+        *addr = val;
+        __ia64_mf_a();
+}
+
+static inline void
+__insb (unsigned long port, void *dst, unsigned long count)
+{
+        unsigned char *dp = dst;
+
+        while (count--)
+                *dp++ = platform_inb(port);
+}
+
+static inline void
+__insw (unsigned long port, void *dst, unsigned long count)
+{
+        unsigned short *dp = dst;
+
+        while (count--)
+                *dp++ = platform_inw(port);
+}
+
+static inline void
+__insl (unsigned long port, void *dst, unsigned long count)
+{
+        unsigned int *dp = dst;
+
+        while (count--)
+                *dp++ = platform_inl(port);
+}
+
+static inline void
+__outsb (unsigned long port, const void *src, unsigned long count)
+{
+        const unsigned char *sp = src;
+
+        while (count--)
+                platform_outb(*sp++, port);
+}
+
+static inline void
+__outsw (unsigned long port, const void *src, unsigned long count)
+{
+        const unsigned short *sp = src;
+
+        while (count--)
+                platform_outw(*sp++, port);
+}
+
+static inline void
+__outsl (unsigned long port, const void *src, unsigned long count)
+{
+        const unsigned int *sp = src;
+
+        while (count--)
+                platform_outl(*sp++, port);
+}
+
+/*
+ * Unfortunately, some platforms are broken and do not follow the IA-64 architecture
+ * specification regarding legacy I/O support.  Thus, we have to make these operations
+ * platform dependent...
+ */
+#define __inb           platform_inb
+#define __inw           platform_inw
+#define __inl           platform_inl
+#define __outb          platform_outb
+#define __outw          platform_outw
+#define __outl          platform_outl
+#define __mmiowb        platform_mmiowb
+
+#define inb(p)          __inb(p)
+#define inw(p)          __inw(p)
+#define inl(p)          __inl(p)
+#define insb(p,d,c)     __insb(p,d,c)
+#define insw(p,d,c)     __insw(p,d,c)
+#define insl(p,d,c)     __insl(p,d,c)
+#define outb(v,p)       __outb(v,p)
+#define outw(v,p)       __outw(v,p)
+#define outl(v,p)       __outl(v,p)
+#define outsb(p,s,c)    __outsb(p,s,c)
+#define outsw(p,s,c)    __outsw(p,s,c)
+#define outsl(p,s,c)    __outsl(p,s,c)
+#define mmiowb()        __mmiowb()
+
+/*
+ * The address passed to these functions are ioremap()ped already.
+ *
+ * We need these to be machine vectors since some platforms don't provide
+ * DMA coherence via PIO reads (PCI drivers and the spec imply that this is
+ * a good idea).  Writes are ok though for all existing ia64 platforms (and
+ * hopefully it'll stay that way).
+ */
+static inline unsigned char
+___ia64_readb (const volatile void __iomem *addr)
+{
+        return *(volatile unsigned char __force *)addr;
+}
+
+static inline unsigned short
+___ia64_readw (const volatile void __iomem *addr)
+{
+        return *(volatile unsigned short __force *)addr;
+}
+
+static inline unsigned int
+___ia64_readl (const volatile void __iomem *addr)
+{
+        return *(volatile unsigned int __force *) addr;
+}
+
+static inline unsigned long
+___ia64_readq (const volatile void __iomem *addr)
+{
+        return *(volatile unsigned long __force *) addr;
+}
+
+static inline void
+__writeb (unsigned char val, volatile void __iomem *addr)
+{
+        *(volatile unsigned char __force *) addr = val;
+}
+
+static inline void
+__writew (unsigned short val, volatile void __iomem *addr)
+{
+        *(volatile unsigned short __force *) addr = val;
+}
+
+static inline void
+__writel (unsigned int val, volatile void __iomem *addr)
+{
+        *(volatile unsigned int __force *) addr = val;
+}
+
+static inline void
+__writeq (unsigned long val, volatile void __iomem *addr)
+{
+        *(volatile unsigned long __force *) addr = val;
+}
+
+#define __readb         platform_readb
+#define __readw         platform_readw
+#define __readl         platform_readl
+#define __readq         platform_readq
+#define __readb_relaxed platform_readb_relaxed
+#define __readw_relaxed platform_readw_relaxed
+#define __readl_relaxed platform_readl_relaxed
+#define __readq_relaxed platform_readq_relaxed
+
+#define readb(a)        __readb((a))
+#define readw(a)        __readw((a))
+#define readl(a)        __readl((a))
+#define readq(a)        __readq((a))
+#define readb_relaxed(a)        __readb_relaxed((a))
+#define readw_relaxed(a)        __readw_relaxed((a))
+#define readl_relaxed(a)        __readl_relaxed((a))
+#define readq_relaxed(a)        __readq_relaxed((a))
+#define __raw_readb     readb
+#define __raw_readw     readw
+#define __raw_readl     readl
+#define __raw_readq     readq
+#define __raw_readb_relaxed     readb_relaxed
+#define __raw_readw_relaxed     readw_relaxed
+#define __raw_readl_relaxed     readl_relaxed
+#define __raw_readq_relaxed     readq_relaxed
+#define writeb(v,a)     __writeb((v), (a))
+#define writew(v,a)     __writew((v), (a))
+#define writel(v,a)     __writel((v), (a))
+#define writeq(v,a)     __writeq((v), (a))
+#define __raw_writeb    writeb
+#define __raw_writew    writew
+#define __raw_writel    writel
+#define __raw_writeq    writeq
+
+#ifndef inb_p
+# define inb_p          inb
+#endif
+#ifndef inw_p
+# define inw_p          inw
+#endif
+#ifndef inl_p
+# define inl_p          inl
+#endif
+
+#ifndef outb_p
+# define outb_p         outb
+#endif
+#ifndef outw_p
+# define outw_p         outw
+#endif
+#ifndef outl_p
+# define outl_p         outl
+#endif
+
+/*
+ * An "address" in IO memory space is not clearly either an integer or a pointer. We will
+ * accept both, thus the casts.
+ *
+ * On ia-64, we access the physical I/O memory space through the uncached kernel region.
+ */
+static inline void __iomem *
+ioremap (unsigned long offset, unsigned long size)
+{
+        return (void __iomem *) (__IA64_UNCACHED_OFFSET | (offset));
+}
+
+static inline void
+iounmap (volatile void __iomem *addr)
+{
+}
+
+#define ioremap_nocache(o,s)    ioremap(o,s)
+
+# ifdef __KERNEL__
+
+/*
+ * String version of IO memory access ops:
+ */
+extern void memcpy_fromio(void *dst, const volatile void __iomem *src, long n);
+extern void memcpy_toio(volatile void __iomem *dst, const void *src, long n);
+extern void memset_io(volatile void __iomem *s, int c, long n);
+
+#define dma_cache_inv(_start,_size)             do { } while (0)
+#define dma_cache_wback(_start,_size)           do { } while (0)
+#define dma_cache_wback_inv(_start,_size)       do { } while (0)
+
+# endif /* __KERNEL__ */
+
+/*
+ * Enabling BIO_VMERGE_BOUNDARY forces us to turn off I/O MMU bypassing.  It is said that
+ * BIO-level virtual merging can give up to 4% performance boost (not verified for ia64).
+ * On the other hand, we know that I/O MMU bypassing gives ~8% performance improvement on
+ * SPECweb-like workloads on zx1-based machines.  Thus, for now we favor I/O MMU bypassing
+ * over BIO-level virtual merging.
+ */
+extern unsigned long ia64_max_iommu_merge_mask;
+#if 1
+#define BIO_VMERGE_BOUNDARY     0
+#else
+/*
+ * It makes no sense at all to have this BIO_VMERGE_BOUNDARY macro here.  Should be
+ * replaced by dma_merge_mask() or something of that sort.  Note: the only way
+ * BIO_VMERGE_BOUNDARY is used is to mask off bits.  Effectively, our definition gets
+ * expanded into:
+ *
+ *      addr & ((ia64_max_iommu_merge_mask + 1) - 1) == (addr & ia64_max_iommu_vmerge_mask)
+ *
+ * which is precisely what we want.
+ */
+#define BIO_VMERGE_BOUNDARY     (ia64_max_iommu_merge_mask + 1)
+#endif
+
+#endif /* _ASM_IA64_IO_H */