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Annotation of kernel/machdep/ppc/dbdma.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991  
        !            27:  *              All Rights Reserved 
        !            28:  *  
        !            29:  * Permission to use, copy, modify, and distribute this software and 
        !            30:  * its documentation for any purpose and without fee is hereby granted, 
        !            31:  * provided that the above copyright notice appears in all copies and 
        !            32:  * that both the copyright notice and this permission notice appear in 
        !            33:  * supporting documentation. 
        !            34:  *  
        !            35:  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
        !            36:  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
        !            37:  * FOR A PARTICULAR PURPOSE. 
        !            38:  *  
        !            39:  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 
        !            40:  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
        !            41:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 
        !            42:  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 
        !            43:  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
        !            44:  * 
        !            45:  */
        !            46: /*
        !            47:  * MKLINUX-1.0DR2
        !            48:  */
        !            49: 
        !            50: #import <mach/mach_types.h>
        !            51: #import <ppc/powermac.h>
        !            52: #import <ppc/proc_reg.h>
        !            53: #import "dbdma.h"
        !            54: #import <sys/param.h>
        !            55: 
        !            56: #define PG_SIZE                NBPG
        !            57: static unsigned long dbdma_area[(PG_SIZE + 16)/sizeof(long)];
        !            58: 
        !            59: //#define KVTOPHYS     kvtophys
        !            60: 
        !            61: static __inline__ vm_offset_t
        !            62: KVTOPHYS(vm_offset_t v)
        !            63: {
        !            64:     return (v);
        !            65: }
        !            66: 
        !            67: static int     dbdma_alloc_index = 0;
        !            68: dbdma_command_t        *dbdma_alloc_commands = 0;
        !            69: 
        !            70: void
        !            71: dbdma_start(int channel, dbdma_command_t *commands)
        !            72: {
        !            73:        unsigned long addr = KVTOPHYS((vm_offset_t) commands);
        !            74:        volatile dbdma_regmap_t *dmap = DBDMA_REGMAP(channel);
        !            75: 
        !            76:        eieio();
        !            77:        if (addr & 0xf)
        !            78:                panic("dbdma_start command structure not 16-byte aligned");
        !            79: 
        !            80:        dmap->d_intselect = 0xff; /* Endian magic - clear out interrupts */
        !            81:        eieio();
        !            82: 
        !            83:        DBDMA_ST4_ENDIAN(&dmap->d_control,
        !            84:                         DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_ACTIVE
        !            85:                                           | DBDMA_CNTRL_DEAD
        !            86:                                           | DBDMA_CNTRL_WAKE
        !            87:                                           | DBDMA_CNTRL_FLUSH
        !            88:                                           | DBDMA_CNTRL_PAUSE
        !            89:                                           | DBDMA_CNTRL_RUN)); eieio();
        !            90: 
        !            91:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
        !            92:                eieio();
        !            93: 
        !            94:        dmap->d_cmdptrhi = 0;   eieio();/* 64-bit not yet */
        !            95:        DBDMA_ST4_ENDIAN(&dmap->d_cmdptrlo, addr); eieio();
        !            96: 
        !            97:        DBDMA_ST4_ENDIAN(&dmap->d_control, 
        !            98:                         DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN | DBDMA_CNTRL_WAKE));
        !            99:        eieio();
        !           100: 
        !           101: }
        !           102: 
        !           103: void
        !           104: dbdma_stop(int channel)
        !           105: {
        !           106:        volatile dbdma_regmap_t *dmap = DBDMA_REGMAP(channel);
        !           107: 
        !           108:        eieio();
        !           109:        DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
        !           110:                          DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH)); eieio();
        !           111: 
        !           112:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & (DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH))
        !           113:                eieio();
        !           114: }
        !           115: 
        !           116: void
        !           117: dbdma_flush(int channel)
        !           118: {
        !           119:        volatile dbdma_regmap_t *dmap = DBDMA_REGMAP(channel);
        !           120: 
        !           121: 
        !           122:        eieio();
        !           123:        DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
        !           124:        eieio();
        !           125: 
        !           126:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & (DBDMA_CNTRL_FLUSH))
        !           127:                eieio();
        !           128: }
        !           129: 
        !           130: 
        !           131: void
        !           132: dbdma_reset(int channel)
        !           133: {
        !           134:        volatile dbdma_regmap_t *dmap = DBDMA_REGMAP(channel);
        !           135: 
        !           136: 
        !           137:        eieio();
        !           138:        DBDMA_ST4_ENDIAN(&dmap->d_control,
        !           139:                         DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_ACTIVE
        !           140:                                           | DBDMA_CNTRL_DEAD
        !           141:                                           | DBDMA_CNTRL_WAKE
        !           142:                                           | DBDMA_CNTRL_FLUSH
        !           143:                                           | DBDMA_CNTRL_PAUSE
        !           144:                                           | DBDMA_CNTRL_RUN)); eieio();
        !           145: 
        !           146:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_RUN)
        !           147:                eieio();
        !           148: }
        !           149: 
        !           150: void
        !           151: dbdma_continue(int channel)
        !           152: {
        !           153:        volatile dbdma_regmap_t *dmap = DBDMA_REGMAP(channel);
        !           154: 
        !           155:        eieio();
        !           156:        DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN|DBDMA_CNTRL_WAKE) | DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE|DBDMA_CNTRL_DEAD));
        !           157:        eieio();
        !           158: }
        !           159: 
        !           160: void
        !           161: dbdma_pause(int channel)
        !           162: {
        !           163:        volatile dbdma_regmap_t *dmap = DBDMA_REGMAP(channel);
        !           164: 
        !           165:        eieio();
        !           166:        DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));
        !           167:        eieio();
        !           168: 
        !           169:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
        !           170:                eieio();
        !           171: }
        !           172: 
        !           173: dbdma_command_t        *
        !           174: dbdma_alloc(int count)
        !           175: {
        !           176:        dbdma_command_t *dbdmap;
        !           177: 
        !           178: #define ALIGN_MASK     0xfffffff0UL
        !           179: 
        !           180: #if 0
        !           181:        if (dbdma_alloc_index == 0) 
        !           182:                dbdma_alloc_commands = (dbdma_command_t *) io_map(0, PAGE_SIZE);
        !           183: #endif
        !           184:        if (dbdma_alloc_index == 0) {
        !           185:            dbdma_alloc_commands = (dbdma_command_t *)
        !           186:                ((unsigned long)(dbdma_area + 15) & ALIGN_MASK);
        !           187:        }
        !           188:        
        !           189:        if ((dbdma_alloc_index+count) >= PG_SIZE / sizeof(dbdma_command_t)) 
        !           190:                panic("Too many dbdma command structures!");
        !           191: 
        !           192:        dbdmap = &dbdma_alloc_commands[dbdma_alloc_index];
        !           193:        dbdma_alloc_index += count;
        !           194:        return  dbdmap;
        !           195: }

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