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