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/* $Id$
*
* 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) 1992 - 1997, 2000 Silicon Graphics, Inc.
* Copyright (C) 2000 by Colin Ngam
*/
#ifndef _ASM_SN_XTALK_XTALKADDRS_H
#define _ASM_SN_XTALK_XTALKADDRS_H
#include <linux/config.h>
/*
* CrossTalk to SN0 Hub addressing support
*
* This file defines the mapping conventions used by the Hub's
* I/O interface when it receives a read or write request from
* a CrossTalk widget.
*
* Format for non-Memory accesses:
*
* +--------------+------------------------------------------------+
* | 0 | XXXXX | SN0Addr |
* +----+---------+------------------------------------------------+
* 47 46 40 39 0
* bit 47 indicates Memory (0)
* bits 46..40 are unused
* bits 39..0 hold the memory address
* (bits 39..31 hold the nodeID in N mode
* bits 39..32 hold the nodeID in M mode
* By design, this looks exactly like a 0-extended SN0 Address, so
* we don't need to do any conversions.
*
*
*
* Format for non-Memory accesses:
*
* +--------------+------+---------+------+--+---------------------+
* | 1 | DstNode | XXXX | BigW=0 | SW=1 | 1| Addr |
* +----+---------+------+---------+------+--+---------------------+
* 47 46 38 37 31 30 28 27 24 23 22 0
*
* bit 47 indicates IO (1)
* bits 46..38 hold the destination node ID
* bits 37..31 are unused
* bits 30..28 hold the big window being addressed
* bits 27..24 hold the small window being addressed
* 0 always refers to the xbow
* 1 always refers to the hub itself
* bit 23 indicates local (0) or remote (1)
* no accessing checks are done if this bit is 0
* bits 22..0 hold the register address
* bits 22..21 determine which section of the hub
* 00 -> PI
* 01 -> MD
* 10 -> IO
* 11 -> NI
* This looks very much like a REMOTE_HUB access, except the nodeID
* is in a different place, and the highest xtalk bit is set.
*/
/* Hub-specific xtalk definitions */
#define HX_MEM_BIT 0L /* Hub's idea of xtalk memory access */
#define HX_IO_BIT 1L /* Hub's idea of xtalk register access */
#define HX_ACCTYPE_SHIFT 47
#if CONFIG_SGI_IP35 || CONFIG_IA64_SGI_SN1 || CONFIG_IA64_GENERIC
#define HX_NODE_SHIFT 39
#endif
#define HX_BIGWIN_SHIFT 28
#define HX_SWIN_SHIFT 23
#define HX_LOCACC 0L /* local access */
#define HX_REMACC 1L /* remote access */
#define HX_ACCESS_SHIFT 23
/*
* Pre-calculate the fixed portion of a crosstalk address that maps
* to local register space on a hub.
*/
#define HX_REG_BASE ((HX_IO_BIT<<HX_ACCTYPE_SHIFT) + \
(0L<<HX_BIGWIN_SHIFT) + \
(1L<<HX_SWIN_SHIFT) + IALIAS_SIZE + \
(HX_REMACC<<HX_ACCESS_SHIFT))
/*
* Return a crosstalk address which a widget can use to access a
* designated register on a designated node.
*/
#define HUBREG_AS_XTALKADDR(nasid, regaddr) \
((iopaddr_t)(HX_REG_BASE + (((long)nasid)<<HX_NODE_SHIFT) + ((long)regaddr)))
#if TBD
#assert sizeof(iopaddr_t) == 8
#endif /* TBD */
/*
* Get widget part number, given node id and widget id.
* Always do a 32-bit read, because some widgets, e.g., Bridge, require so.
* Widget ID is at offset 0 for 64-bit access. Add 4 to get lower 32 bits
* in big endian mode.
* XXX Double check this with Hub, Xbow, Bridge and other hardware folks.
*/
#define XWIDGET_ID_READ(nasid, widget) \
(widgetreg_t)(*(volatile uint32_t *)(NODE_SWIN_BASE(nasid, widget) + WIDGET_ID))
#endif /* _ASM_SN_XTALK_XTALKADDRS_H */
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