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