LXR linux/arch/ia64/sn/kernel/iomv.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2000-2003, 2006 Silicon Graphics, Inc. All rights reserved.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/acpi.h>
  11#include <asm/io.h>
  12#include <asm/delay.h>
  13#include <asm/vga.h>
  14#include <asm/sn/nodepda.h>
  15#include <asm/sn/simulator.h>
  16#include <asm/sn/pda.h>
  17#include <asm/sn/sn_cpuid.h>
  18#include <asm/sn/shub_mmr.h>
  19#include <asm/sn/acpi.h>
  20
  21#define IS_LEGACY_VGA_IOPORT(p) \
  22        (((p) >= 0x3b0 && (p) <= 0x3bb) || ((p) >= 0x3c0 && (p) <= 0x3df))
  23
  24/**
  25 * sn_io_addr - convert an in/out port to an i/o address
  26 * @port: port to convert
  27 *
  28 * Legacy in/out instructions are converted to ld/st instructions
  29 * on IA64.  This routine will convert a port number into a valid
  30 * SN i/o address.  Used by sn_in*() and sn_out*().
  31 */
  32
  33void *sn_io_addr(unsigned long port)
  34{
  35        if (!IS_RUNNING_ON_SIMULATOR()) {
  36                if (IS_LEGACY_VGA_IOPORT(port))
  37                        return (__ia64_mk_io_addr(port));
  38                /* On sn2, legacy I/O ports don't point at anything */
  39                if (port < (64 * 1024))
  40                        return NULL;
  41                if (SN_ACPI_BASE_SUPPORT())
  42                        return (__ia64_mk_io_addr(port));
  43                else
  44                        return ((void *)(port | __IA64_UNCACHED_OFFSET));
  45        } else {
  46                /* but the simulator uses them... */
  47                unsigned long addr;
  48
  49                /*
  50                 * word align port, but need more than 10 bits
  51                 * for accessing registers in bedrock local block
  52                 * (so we don't do port&0xfff)
  53                 */
  54                addr = (is_shub2() ? 0xc00000028c000000UL : 0xc0000087cc000000UL) | ((port >> 2) << 12);
  55                if ((port >= 0x1f0 && port <= 0x1f7) || port == 0x3f6 || port == 0x3f7)
  56                        addr |= port;
  57                return (void *)addr;
  58        }
  59}
  60
  61EXPORT_SYMBOL(sn_io_addr);
  62
  63/**
  64 * __sn_mmiowb - I/O space memory barrier
  65 *
  66 * See arch/ia64/include/asm/io.h and Documentation/DocBook/deviceiobook.tmpl
  67 * for details.
  68 *
  69 * On SN2, we wait for the PIO_WRITE_STATUS SHub register to clear.
  70 * See PV 871084 for details about the WAR about zero value.
  71 *
  72 */
  73void __sn_mmiowb(void)
  74{
  75        volatile unsigned long *adr = pda->pio_write_status_addr;
  76        unsigned long val = pda->pio_write_status_val;
  77
  78        while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val)
  79                cpu_relax();
  80}
  81
  82EXPORT_SYMBOL(__sn_mmiowb);
  83