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
  33 void *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
  61 EXPORT_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  */
  73 void __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
  82 EXPORT_SYMBOL(__sn_mmiowb);