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
  20 #define IS_LEGACY_VGA_IOPORT(p) \
  21         (((p) >= 0x3b0 && (p) <= 0x3bb) || ((p) >= 0x3c0 && (p) <= 0x3df))
  22
  23 /**
  24  * sn_io_addr - convert an in/out port to an i/o address
  25  * @port: port to convert
  26  *
  27  * Legacy in/out instructions are converted to ld/st instructions
  28  * on IA64.  This routine will convert a port number into a valid
  29  * SN i/o address.  Used by sn_in*() and sn_out*().
  30  */
  31
  32 extern int sn_acpi_base_support();
  33
  34 void *sn_io_addr(unsigned long port)
  35 {
  36         if (!IS_RUNNING_ON_SIMULATOR()) {
  37                 if (IS_LEGACY_VGA_IOPORT(port))
  38                         return (__ia64_mk_io_addr(port));
  39                 /* On sn2, legacy I/O ports don't point at anything */
  40                 if (port < (64 * 1024))
  41                         return NULL;
  42                 if (sn_acpi_base_support())
  43                         return (__ia64_mk_io_addr(port));
  44                 else
  45                         return ((void *)(port | __IA64_UNCACHED_OFFSET));
  46         } else {
  47                 /* but the simulator uses them... */
  48                 unsigned long addr;
  49
  50                 /*
  51                  * word align port, but need more than 10 bits
  52                  * for accessing registers in bedrock local block
  53                  * (so we don't do port&0xfff)
  54                  */
  55                 addr = (is_shub2() ? 0xc00000028c000000UL : 0xc0000087cc000000UL) | ((port >> 2) << 12);
  56                 if ((port >= 0x1f0 && port <= 0x1f7) || port == 0x3f6 || port == 0x3f7)
  57                         addr |= port;
  58                 return (void *)addr;
  59         }
  60 }
  61
  62 EXPORT_SYMBOL(sn_io_addr);
  63
  64 /**
  65  * __sn_mmiowb - I/O space memory barrier
  66  *
  67  * See include/asm-ia64/io.h and Documentation/DocBook/deviceiobook.tmpl
  68  * for details.
  69  *
  70  * On SN2, we wait for the PIO_WRITE_STATUS SHub register to clear.
  71  * See PV 871084 for details about the WAR about zero value.
  72  *
  73  */
  74 void __sn_mmiowb(void)
  75 {
  76         volatile unsigned long *adr = pda->pio_write_status_addr;
  77         unsigned long val = pda->pio_write_status_val;
  78
  79         while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val)
  80                 cpu_relax();
  81 }
  82
  83 EXPORT_SYMBOL(__sn_mmiowb);