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
6 * Copyright (C) 2000-2003, 2006 Silicon Graphics, Inc. All rights reserved.
9 #include <linux/module.h>
10 #include <linux/acpi.h>
12 #include <asm/delay.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>
20 #define IS_LEGACY_VGA_IOPORT(p) \
21 (((p) >= 0x3b0 && (p) <= 0x3bb) || ((p) >= 0x3c0 && (p) <= 0x3df))
24 * sn_io_addr - convert an in/out port to an i/o address
25 * @port: port to convert
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*().
32 extern int sn_acpi_base_support();
34 void *sn_io_addr(unsigned long port)
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))
42 if (sn_acpi_base_support())
43 return (__ia64_mk_io_addr(port));
45 return ((void *)(port | __IA64_UNCACHED_OFFSET));
47 /* but the simulator uses them... */
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)
55 addr = (is_shub2() ? 0xc00000028c000000UL : 0xc0000087cc000000UL) | ((port >> 2) << 12);
56 if ((port >= 0x1f0 && port <= 0x1f7) || port == 0x3f6 || port == 0x3f7)
62 EXPORT_SYMBOL(sn_io_addr);
65 * __sn_mmiowb - I/O space memory barrier
67 * See include/asm-ia64/io.h and Documentation/DocBook/deviceiobook.tmpl
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.
74 void __sn_mmiowb(void)
76 volatile unsigned long *adr = pda->pio_write_status_addr;
77 unsigned long val = pda->pio_write_status_val;
79 while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val)
83 EXPORT_SYMBOL(__sn_mmiowb);