71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000-2003 Silicon Graphics, Inc. All rights reserved.
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*/
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#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/delay.h>
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#include <asm/sn/nodepda.h>
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#include <asm/sn/simulator.h>
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#include <asm/sn/pda.h>
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#include <asm/sn/sn_cpuid.h>
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#include <asm/sn/shub_mmr.h>
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/**
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* sn_io_addr - convert an in/out port to an i/o address
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* @port: port to convert
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*
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* Legacy in/out instructions are converted to ld/st instructions
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* on IA64. This routine will convert a port number into a valid
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* SN i/o address. Used by sn_in*() and sn_out*().
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*/
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void *sn_io_addr(unsigned long port)
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{
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if (!IS_RUNNING_ON_SIMULATOR()) {
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/* On sn2, legacy I/O ports don't point at anything */
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if (port < (64 * 1024))
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return NULL;
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return ((void *)(port | __IA64_UNCACHED_OFFSET));
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} else {
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/* but the simulator uses them... */
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unsigned long addr;
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/*
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* word align port, but need more than 10 bits
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* for accessing registers in bedrock local block
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* (so we don't do port&0xfff)
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*/
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addr = (is_shub2() ? 0xc00000028c000000UL : 0xc0000087cc000000UL) | ((port >> 2) << 12);
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if ((port >= 0x1f0 && port <= 0x1f7) || port == 0x3f6 || port == 0x3f7)
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addr |= port;
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return (void *)addr;
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}
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}
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EXPORT_SYMBOL(sn_io_addr);
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/**
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* __sn_mmiowb - I/O space memory barrier
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*
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* See include/asm-ia64/io.h and Documentation/DocBook/deviceiobook.tmpl
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* for details.
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*
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* On SN2, we wait for the PIO_WRITE_STATUS SHub register to clear.
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* See PV 871084 for details about the WAR about zero value.
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*
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*/
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void __sn_mmiowb(void)
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{
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volatile unsigned long *adr = pda->pio_write_status_addr;
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unsigned long val = pda->pio_write_status_val;
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while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val)
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cpu_relax();
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}
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EXPORT_SYMBOL(__sn_mmiowb);
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