Return to dbdma.c CVS log

Up to [Apple XNU] / XNU / osfmk / ppc / POWERMAC

Annotation of XNU/osfmk/ppc/POWERMAC/dbdma.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  * 
        !            25:  */
        !            26: 
        !            27: #include <platforms.h>
        !            28: 
        !            29: #include <ppc/proc_reg.h> /* For isync */
        !            30: #include <mach_debug.h>
        !            31: #include <kern/assert.h>
        !            32: #include <kern/cpu_number.h>
        !            33: #include <kern/spl.h>
        !            34: #include <mach/mach_types.h>
        !            35: #include <types.h>
        !            36: #include <pexpert/ppc/powermac.h>
        !            37: #include <ppc/io_map_entries.h>
        !            38: #include <pexpert/ppc/dbdma.h>
        !            39: 
        !            40: 
        !            41: static int     dbdma_alloc_index = 0;
        !            42: dbdma_command_t        *dbdma_alloc_commands = NULL;
        !            43: 
        !            44: void
        !            45: dbdma_start(dbdma_regmap_t *dmap, dbdma_command_t *commands)
        !            46: {
        !            47:        unsigned long addr = kvtophys((vm_offset_t) commands);
        !            48: 
        !            49:        if (addr & 0xf)
        !            50:                panic("dbdma_start command structure not 16-byte aligned");
        !            51: 
        !            52:        dmap->d_intselect = 0xff;       /* Endian magic - clear out interrupts */
        !            53:        DBDMA_ST4_ENDIAN(&dmap->d_control, 
        !            54:                         DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE |
        !            55:                                             DBDMA_CNTRL_DEAD   |
        !            56:                                             DBDMA_CNTRL_WAKE   |
        !            57:                                             DBDMA_CNTRL_FLUSH  |
        !            58:                                             DBDMA_CNTRL_PAUSE  |
        !            59:                                             DBDMA_CNTRL_RUN      )));      
        !            60:        eieio();
        !            61:      
        !            62:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
        !            63:                eieio();
        !            64: 
        !            65:        dmap->d_cmdptrhi = 0;   eieio();/* 64-bit not yet */
        !            66:        DBDMA_ST4_ENDIAN(&dmap->d_cmdptrlo, addr); eieio();
        !            67: 
        !            68:        DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN));
        !            69:        eieio();
        !            70: 
        !            71: }
        !            72: 
        !            73: void
        !            74: dbdma_stop(dbdma_regmap_t *dmap)
        !            75: {
        !            76:        DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_RUN) |
        !            77:                          DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH)); eieio();
        !            78: 
        !            79:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & (DBDMA_CNTRL_ACTIVE|DBDMA_CNTRL_FLUSH))
        !            80:                eieio();
        !            81: }
        !            82: 
        !            83: void
        !            84: dbdma_flush(dbdma_regmap_t *dmap)
        !            85: {
        !            86:        DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_FLUSH));
        !            87:        eieio();
        !            88: 
        !            89:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & (DBDMA_CNTRL_FLUSH))
        !            90:                eieio();
        !            91: }
        !            92: 
        !            93: void
        !            94: dbdma_reset(dbdma_regmap_t *dmap)
        !            95: {
        !            96:        DBDMA_ST4_ENDIAN(&dmap->d_control, 
        !            97:                         DBDMA_CLEAR_CNTRL( (DBDMA_CNTRL_ACTIVE |
        !            98:                                             DBDMA_CNTRL_DEAD   |
        !            99:                                             DBDMA_CNTRL_WAKE   |
        !           100:                                             DBDMA_CNTRL_FLUSH  |
        !           101:                                             DBDMA_CNTRL_PAUSE  |
        !           102:                                             DBDMA_CNTRL_RUN      )));      
        !           103:        eieio();
        !           104: 
        !           105:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_RUN)
        !           106:                eieio();
        !           107: }
        !           108: 
        !           109: void
        !           110: dbdma_continue(dbdma_regmap_t *dmap)
        !           111: {
        !           112:        DBDMA_ST4_ENDIAN(&dmap->d_control, DBDMA_SET_CNTRL(DBDMA_CNTRL_RUN|DBDMA_CNTRL_WAKE) | DBDMA_CLEAR_CNTRL(DBDMA_CNTRL_PAUSE|DBDMA_CNTRL_DEAD));
        !           113:        eieio();
        !           114: }
        !           115: 
        !           116: void
        !           117: dbdma_pause(dbdma_regmap_t *dmap)
        !           118: {
        !           119:        DBDMA_ST4_ENDIAN(&dmap->d_control,DBDMA_SET_CNTRL(DBDMA_CNTRL_PAUSE));
        !           120:        eieio();
        !           121: 
        !           122:        while (DBDMA_LD4_ENDIAN(&dmap->d_status) & DBDMA_CNTRL_ACTIVE)
        !           123:                eieio();
        !           124: }
        !           125: 
        !           126: dbdma_command_t        *
        !           127: dbdma_alloc(int count)
        !           128: {
        !           129:        dbdma_command_t *dbdmap;
        !           130: 
        !           131:        /*
        !           132:         * For now, we assume that dbdma_alloc() is called only when
        !           133:         * the system is bootstrapping, i.e. before the other CPUs
        !           134:         * are activated...
        !           135:         * If that's not the case, we need to protect the global
        !           136:         * variables here.
        !           137:         */
        !           138:        assert(cpu_number() == master_cpu);
        !           139: 
        !           140:        if (dbdma_alloc_index == 0) 
        !           141:                dbdma_alloc_commands = (dbdma_command_t *) io_map(0, PAGE_SIZE);
        !           142:        if ((dbdma_alloc_index+count) >= PAGE_SIZE / sizeof(dbdma_command_t)) 
        !           143:                panic("Too many dbdma command structures!");
        !           144: 
        !           145:        dbdmap = &dbdma_alloc_commands[dbdma_alloc_index];
        !           146:        dbdma_alloc_index += count;
        !           147:        return  dbdmap;
        !           148: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.