Annotation of src/sys/arch/evbppc/virtex/dcr.h, Revision 1.1.4.2
1.1.4.2 ! yamt 1: /* $NetBSD: dcr.h,v 1.1.4.1 2006/12/30 20:45:54 yamt Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2006 Jachym Holecek
! 5: * All rights reserved.
! 6: *
! 7: * Written for DFC Design, s.r.o.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: *
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: *
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 21: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 22: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 23: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 24: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 25: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 26: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 27: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 28: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 29: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 30: */
! 31:
! 32: /*
! 33: * DCR is an user accesible bus on Xilinx PPC405D5Xn cores and may contain
! 34: * arbitrary devices. Because we want to be able to share drivers with
! 35: * OPB/PLB, we make it a bus space backend. Each platform ("design", "board")
! 36: * has to provide the leaf _read_4/_write_4 routines specific to device
! 37: * instances. This is dictated by the fact that DCR can only by accessed
! 38: * by m{f,t}dcr instructions for which the address is encoded as immediate
! 39: * operand (and hence needs to be a compile-time constant).
! 40: *
! 41: * The flexibility is well worth the price of one indirection (and a sum
! 42: * and a branch), critical paths can still be implemented with m{f,t}dcr().
! 43: */
! 44:
! 45: #ifndef _VIRTEX_DCRVAR_H_
! 46: #define _VIRTEX_DCRVAR_H_
! 47:
! 48:
! 49: /* From evbppc/virtex/machdep.c */
! 50: int dcr_subregion(bus_space_tag_t, bus_space_handle_t, bus_size_t,
! 51: bus_size_t, bus_space_handle_t *);
! 52: int dcr_map(bus_space_tag_t, bus_addr_t, bus_size_t, int,
! 53: bus_space_handle_t *);
! 54: void dcr_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t);
! 55:
! 56: /* Bus space tag contents, one tag per DCR device. */
! 57: #define DCR_BST_BODY(base, read, write) \
! 58: .pbs_flags = _BUS_SPACE_BIG_ENDIAN, \
! 59: .pbs_offset = 0, \
! 60: .pbs_base = (base), \
! 61: .pbs_limit = 0x03ff, \
! 62: .pbs_scalar = { \
! 63: .pbss_write_4 = (write), \
! 64: .pbss_read_4 = (read), \
! 65: }, \
! 66: .pbs_map = dcr_map, \
! 67: .pbs_unmap = dcr_unmap, \
! 68: .pbs_subregion = dcr_subregion,
! 69:
! 70: /*
! 71: * Utility macros for leaf access routines. Note they assume variables
! 72: * in local scope, and are furthermore assumed to be used in switch()
! 73: * dispatch over destination address.
! 74: */
! 75: #define WCASE(base, addr) \
! 76: case (addr): mtdcr((base) + (addr) / 4, val); break
! 77:
! 78: #define WDEAD(addr) \
! 79: default: panic("%s: unexpected offset %#08x", __func__, (addr))
! 80:
! 81: #define RCASE(base, addr) \
! 82: case (addr): val = mfdcr((base) + (addr) / 4); break
! 83:
! 84: #define RDEAD(addr) \
! 85: default: panic("%s: unexpected offset %#08x", __func__, (addr))
! 86:
! 87: #endif /* _VIRTEX_DCRVAR_H_ */
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