| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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/sn/nodepda.h> |
| 13 | #include <asm/sn/simulator.h> |
| 14 | #include <asm/sn/pda.h> |
| 15 | #include <asm/sn/sn_cpuid.h> |
| 16 | #include <asm/sn/shub_mmr.h> |
| 17 | |
| 18 | /** |
| 19 | * sn_io_addr - convert an in/out port to an i/o address |
| 20 | * @port: port to convert |
| 21 | * |
| 22 | * Legacy in/out instructions are converted to ld/st instructions |
| 23 | * on IA64. This routine will convert a port number into a valid |
| 24 | * SN i/o address. Used by sn_in*() and sn_out*(). |
| 25 | */ |
| 26 | void *sn_io_addr(unsigned long port) |
| 27 | { |
| 28 | if (!IS_RUNNING_ON_SIMULATOR()) { |
| 29 | /* On sn2, legacy I/O ports don't point at anything */ |
| 30 | if (port < (64 * 1024)) |
| 31 | return NULL; |
| 32 | return ((void *)(port | __IA64_UNCACHED_OFFSET)); |
| 33 | } else { |
| 34 | /* but the simulator uses them... */ |
| 35 | unsigned long addr; |
| 36 | |
| 37 | /* |
| 38 | * word align port, but need more than 10 bits |
| 39 | * for accessing registers in bedrock local block |
| 40 | * (so we don't do port&0xfff) |
| 41 | */ |
| 42 | addr = (is_shub2() ? 0xc00000028c000000UL : 0xc0000087cc000000UL) | ((port >> 2) << 12); |
| 43 | if ((port >= 0x1f0 && port <= 0x1f7) || port == 0x3f6 || port == 0x3f7) |
| 44 | addr |= port; |
| 45 | return (void *)addr; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | EXPORT_SYMBOL(sn_io_addr); |
| 50 | |
| 51 | /** |
| 52 | * __sn_mmiowb - I/O space memory barrier |
| 53 | * |
| 54 | * See include/asm-ia64/io.h and Documentation/DocBook/deviceiobook.tmpl |
| 55 | * for details. |
| 56 | * |
| 57 | * On SN2, we wait for the PIO_WRITE_STATUS SHub register to clear. |
| 58 | * See PV 871084 for details about the WAR about zero value. |
| 59 | * |
| 60 | */ |
| 61 | void __sn_mmiowb(void) |
| 62 | { |
| 63 | volatile unsigned long *adr = pda->pio_write_status_addr; |
| 64 | unsigned long val = pda->pio_write_status_val; |
| 65 | |
| 66 | while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val) |
| 67 | cpu_relax(); |
| 68 | } |
| 69 | |
| 70 | EXPORT_SYMBOL(__sn_mmiowb); |