blob: b1a47da118b114b8754f3e0d30f193266e49fa44 [file] [log] [blame]
Alexey Starikovskiyad718602007-02-02 19:48:19 +03001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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 *
John Keller8ea60912006-10-04 16:49:25 -05006 * Copyright (C) 2000-2003, 2006 Silicon Graphics, Inc. All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 */
8
9#include <linux/module.h>
John Keller8ea60912006-10-04 16:49:25 -050010#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <asm/io.h>
12#include <asm/delay.h>
Mark Maulea9f9de72005-04-26 08:01:00 -070013#include <asm/vga.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#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
Mark Maulea9f9de72005-04-26 08:01:00 -070020#define IS_LEGACY_VGA_IOPORT(p) \
21 (((p) >= 0x3b0 && (p) <= 0x3bb) || ((p) >= 0x3c0 && (p) <= 0x3df))
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023/**
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
Alexey Starikovskiyad718602007-02-02 19:48:19 +030028 * on IA64. This routine will convert a port number into a valid
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * SN i/o address. Used by sn_in*() and sn_out*().
30 */
Alexey Starikovskiyad718602007-02-02 19:48:19 +030031
32extern int sn_acpi_base_support();
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034void *sn_io_addr(unsigned long port)
35{
36 if (!IS_RUNNING_ON_SIMULATOR()) {
Mark Maulea9f9de72005-04-26 08:01:00 -070037 if (IS_LEGACY_VGA_IOPORT(port))
John Keller8ea60912006-10-04 16:49:25 -050038 return (__ia64_mk_io_addr(port));
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 /* On sn2, legacy I/O ports don't point at anything */
40 if (port < (64 * 1024))
41 return NULL;
Alexey Starikovskiyad718602007-02-02 19:48:19 +030042 if (sn_acpi_base_support())
John Keller8ea60912006-10-04 16:49:25 -050043 return (__ia64_mk_io_addr(port));
44 else
45 return ((void *)(port | __IA64_UNCACHED_OFFSET));
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 } 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
62EXPORT_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 */
74void __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
83EXPORT_SYMBOL(__sn_mmiowb);