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/* $Id: xtalkaddrs.h,v 1.1.1.1 2004-04-15 02:58:11 phoenix Exp $
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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) 1992-1997,2000-2003 Silicon Graphics, Inc. All Rights Reserved.
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*/
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#ifndef _ASM_SN_XTALK_XTALKADDRS_H
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#define _ASM_SN_XTALK_XTALKADDRS_H
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/*
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* CrossTalk to SN0 Hub addressing support
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*
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* This file defines the mapping conventions used by the Hub's
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* I/O interface when it receives a read or write request from
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* a CrossTalk widget.
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*
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* Format for non-Memory accesses:
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*
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* +--------------+------------------------------------------------+
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* | 0 | XXXXX | SN0Addr |
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* +----+---------+------------------------------------------------+
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* 47 46 40 39 0
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* bit 47 indicates Memory (0)
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* bits 46..40 are unused
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* bits 39..0 hold the memory address
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* (bits 39..31 hold the nodeID in N mode
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* bits 39..32 hold the nodeID in M mode
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* By design, this looks exactly like a 0-extended SN0 Address, so
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* we don't need to do any conversions.
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*
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*
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*
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* Format for non-Memory accesses:
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*
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* +--------------+------+---------+------+--+---------------------+
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* | 1 | DstNode | XXXX | BigW=0 | SW=1 | 1| Addr |
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* +----+---------+------+---------+------+--+---------------------+
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* 47 46 38 37 31 30 28 27 24 23 22 0
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*
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* bit 47 indicates IO (1)
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* bits 46..38 hold the destination node ID
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* bits 37..31 are unused
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* bits 30..28 hold the big window being addressed
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* bits 27..24 hold the small window being addressed
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* 0 always refers to the xbow
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* 1 always refers to the hub itself
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* bit 23 indicates local (0) or remote (1)
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* no accessing checks are done if this bit is 0
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* bits 22..0 hold the register address
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* bits 22..21 determine which section of the hub
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* 00 -> PI
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* 01 -> MD
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* 10 -> IO
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* 11 -> NI
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* This looks very much like a REMOTE_HUB access, except the nodeID
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* is in a different place, and the highest xtalk bit is set.
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*/
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/* Hub-specific xtalk definitions */
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#define HX_MEM_BIT 0L /* Hub's idea of xtalk memory access */
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#define HX_IO_BIT 1L /* Hub's idea of xtalk register access */
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#define HX_ACCTYPE_SHIFT 47
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#define HX_NODE_SHIFT 39
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#define HX_BIGWIN_SHIFT 28
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#define HX_SWIN_SHIFT 23
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#define HX_LOCACC 0L /* local access */
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#define HX_REMACC 1L /* remote access */
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#define HX_ACCESS_SHIFT 23
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/*
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* Pre-calculate the fixed portion of a crosstalk address that maps
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* to local register space on a hub.
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*/
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#define HX_REG_BASE ((HX_IO_BIT<<HX_ACCTYPE_SHIFT) + \
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(0L<<HX_BIGWIN_SHIFT) + \
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(1L<<HX_SWIN_SHIFT) + IALIAS_SIZE + \
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(HX_REMACC<<HX_ACCESS_SHIFT))
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/*
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* Return a crosstalk address which a widget can use to access a
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* designated register on a designated node.
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*/
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#define HUBREG_AS_XTALKADDR(nasid, regaddr) \
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((iopaddr_t)(HX_REG_BASE + (((long)nasid)<<HX_NODE_SHIFT) + ((long)regaddr)))
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#if TBD
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#assert sizeof(iopaddr_t) == 8
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#endif /* TBD */
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/*
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* Get widget part number, given node id and widget id.
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* Always do a 32-bit read, because some widgets, e.g., Bridge, require so.
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* Widget ID is at offset 0 for 64-bit access. Add 4 to get lower 32 bits
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* in big endian mode.
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* XXX Double check this with Hub, Xbow, Bridge and other hardware folks.
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*/
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#define XWIDGET_ID_READ(nasid, widget) \
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(widgetreg_t)(*(volatile uint32_t *)(NODE_SWIN_BASE(nasid, widget) + WIDGET_ID))
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#endif /* _ASM_SN_XTALK_XTALKADDRS_H */
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