diff options
Diffstat (limited to 'arch/ia64/sn/io/machvec/iomv.c')
-rw-r--r-- | arch/ia64/sn/io/machvec/iomv.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/ia64/sn/io/machvec/iomv.c b/arch/ia64/sn/io/machvec/iomv.c new file mode 100644 index 00000000000000..e69d0b81d9531e --- /dev/null +++ b/arch/ia64/sn/io/machvec/iomv.c @@ -0,0 +1,71 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2000-2003 Silicon Graphics, Inc. All rights reserved. + */ + +#include <linux/pci.h> +#include <linux/module.h> +#include <asm/io.h> +#include <asm/delay.h> +#include <asm/sn/simulator.h> +#include <asm/sn/pda.h> +#include <asm/sn/sn_cpuid.h> + +/** + * sn_io_addr - convert an in/out port to an i/o address + * @port: port to convert + * + * Legacy in/out instructions are converted to ld/st instructions + * on IA64. This routine will convert a port number into a valid + * SN i/o address. Used by sn_in*() and sn_out*(). + */ +void * +sn_io_addr(unsigned long port) +{ + if (!IS_RUNNING_ON_SIMULATOR()) { + return( (void *) (port | __IA64_UNCACHED_OFFSET)); + } else { + unsigned long io_base; + unsigned long addr; + + /* + * word align port, but need more than 10 bits + * for accessing registers in bedrock local block + * (so we don't do port&0xfff) + */ + if ((port >= 0x1f0 && port <= 0x1f7) || + port == 0x3f6 || port == 0x3f7) { + io_base = (0xc000000fcc000000 | ((unsigned long)get_nasid() << 38)); + addr = io_base | ((port >> 2) << 12) | (port & 0xfff); + } else { + addr = __ia64_get_io_port_base() | ((port >> 2) << 2); + } + return(void *) addr; + } +} + +EXPORT_SYMBOL(sn_io_addr); + +/** + * sn_mmiob - I/O space memory barrier + * + * Acts as a memory mapped I/O barrier for platforms that queue writes to + * I/O space. This ensures that subsequent writes to I/O space arrive after + * all previous writes. For most ia64 platforms, this is a simple + * 'mf.a' instruction. For other platforms, mmiob() may have to read + * a chipset register to ensure ordering. + * + * On SN2, we wait for the PIO_WRITE_STATUS SHub register to clear. + * See PV 871084 for details about the WAR about zero value. + * + */ +void +sn_mmiob (void) +{ + while ((((volatile unsigned long) (*pda->pio_write_status_addr)) & SH_PIO_WRITE_STATUS_0_PENDING_WRITE_COUNT_MASK) != + SH_PIO_WRITE_STATUS_0_PENDING_WRITE_COUNT_MASK) + udelay(1); +} |