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Annotation of kernel/machdep/ppc/dbdma.h, 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: #ifndef _POWERMAC_DBDMA_H_
        !            51: #define _POWERMAC_DBDMA_H_
        !            52: 
        !            53: #define        DBDMA_CMD_OUT_MORE      0
        !            54: #define        DBDMA_CMD_OUT_LAST      1
        !            55: #define        DBDMA_CMD_IN_MORE       2
        !            56: #define        DBDMA_CMD_IN_LAST       3
        !            57: #define        DBDMA_CMD_STORE_QUAD    4
        !            58: #define        DBDMA_CMD_LOAD_QUAD     5
        !            59: #define        DBDMA_CMD_NOP           6
        !            60: #define        DBDMA_CMD_STOP          7
        !            61: 
        !            62: /* Keys */
        !            63: 
        !            64: #define        DBDMA_KEY_STREAM0       0
        !            65: #define        DBDMA_KEY_STREAM1       1
        !            66: #define        DBDMA_KEY_STREAM2       2
        !            67: #define        DBDMA_KEY_STREAM3       3
        !            68: 
        !            69: /* value 4 is reserved */
        !            70: #define        DBDMA_KEY_REGS          5
        !            71: #define        DBDMA_KEY_SYSTEM        6
        !            72: #define        DBDMA_KEY_DEVICE        7
        !            73: 
        !            74: #define        DBDMA_INT_NEVER         0
        !            75: #define        DBDMA_INT_IF_TRUE       1
        !            76: #define        DBDMA_INT_IF_FALSE      2
        !            77: #define        DBDMA_INT_ALWAYS        3
        !            78: 
        !            79: #define        DBDMA_BRANCH_NEVER      0
        !            80: #define        DBDMA_BRANCH_IF_TRUE    1
        !            81: #define        DBDMA_BRANCH_IF_FALSE   2
        !            82: #define        DBDMA_BRANCH_ALWAYS     3
        !            83: 
        !            84: #define        DBDMA_WAIT_NEVER        0
        !            85: #define        DBDMA_WAIT_IF_TRUE      1
        !            86: #define DBDMA_WAIT_IF_FALSE    2
        !            87: #define        DBDMA_WAIT_ALWAYS       3
        !            88: 
        !            89: 
        !            90: /* DBDMA Channels Macros */
        !            91: 
        !            92: #define        DBDMA_CURIO_SCSI  (powermac_dbdma_channels->dbdma_channel_curio)
        !            93: #define        DBDMA_MESH_SCSI   (powermac_dbdma_channels->dbdma_channel_mesh)
        !            94: #define        DBDMA_FLOPPY      (powermac_dbdma_channels->dbdma_channel_floppy)
        !            95: #define        DBDMA_ETHERNET_TX (powermac_dbdma_channels->dbdma_channel_ethernet_tx)
        !            96: #define        DBDMA_ETHERNET_RV (powermac_dbdma_channels->dbdma_channel_ethernet_rx)
        !            97: #define        DBDMA_SCC_XMIT_A  (powermac_dbdma_channels->dbdma_channel_scc_xmit_a)
        !            98: #define        DBDMA_SCC_RECV_A  (powermac_dbdma_channels->dbdma_channel_scc_recv_a)
        !            99: #define        DBDMA_SCC_XMIT_B  (powermac_dbdma_channels->dbdma_channel_scc_xmit_b)
        !           100: #define        DBDMA_SCC_RECV_B  (powermac_dbdma_channels->dbdma_channel_scc_recv_b)
        !           101: #define        DBDMA_AUDIO_OUT   (powermac_dbdma_channels->dbdma_channel_audio_out)
        !           102: #define        DBDMA_AUDIO_IN    (powermac_dbdma_channels->dbdma_channel_audio_in)
        !           103: #define        DBDMA_IDE0        (powermac_dbdma_channels->dbdma_channel_ide0)
        !           104: #define        DBDMA_IDE1        (powermac_dbdma_channels->dbdma_channel_ide1)
        !           105: 
        !           106: /* Control register values (in little endian) */
        !           107: 
        !           108: #define        DBDMA_STATUS_MASK       0x000000ff      /* Status Mask */
        !           109: #define        DBDMA_CNTRL_BRANCH      0x00000100
        !           110:                                /* 0x200 reserved */
        !           111: #define        DBDMA_CNTRL_ACTIVE      0x00000400
        !           112: #define        DBDMA_CNTRL_DEAD        0x00000800
        !           113: #define        DBDMA_CNTRL_WAKE        0x00001000
        !           114: #define        DBDMA_CNTRL_FLUSH       0x00002000
        !           115: #define        DBDMA_CNTRL_PAUSE       0x00004000
        !           116: #define        DBDMA_CNTRL_RUN         0x00008000
        !           117: 
        !           118: #define        DBDMA_SET_CNTRL(x)      ( ((x) | (x) << 16) )
        !           119: #define        DBDMA_CLEAR_CNTRL(x)    ( (x) << 16)
        !           120: 
        !           121: 
        !           122: #define        DBDMA_REGMAP(channel) \
        !           123:                (dbdma_regmap_t *)((v_u_char *) POWERMAC_IO(PCI_DMA_BASE_PHYS) \
        !           124:                                + (channel << 8))
        !           125: 
        !           126: 
        !           127: /* powermac_dbdma_channels hold the physical channel numbers for
        !           128:  * each dbdma device
        !           129:  */
        !           130: 
        !           131: typedef struct powermac_dbdma_channels {
        !           132:         int             dbdma_channel_curio;
        !           133:         int             dbdma_channel_mesh;
        !           134:         int             dbdma_channel_floppy;
        !           135:         int             dbdma_channel_ethernet_tx;
        !           136:         int             dbdma_channel_ethernet_rx;
        !           137:         int             dbdma_channel_scc_xmit_a;
        !           138:         int             dbdma_channel_scc_recv_a;
        !           139:         int             dbdma_channel_scc_xmit_b;
        !           140:         int             dbdma_channel_scc_recv_b;
        !           141:         int             dbdma_channel_audio_out;
        !           142:         int             dbdma_channel_audio_in;
        !           143:         int             dbdma_channel_ide0;
        !           144:         int             dbdma_channel_ide1;
        !           145: } powermac_dbdma_channels_t;
        !           146: 
        !           147: extern powermac_dbdma_channels_t *powermac_dbdma_channels;
        !           148: 
        !           149: /* This struct is layout in little endian format */
        !           150: 
        !           151: struct dbdma_command {
        !           152:        unsigned long   d_cmd_count;
        !           153:        unsigned long   d_address;
        !           154:        unsigned long   d_cmddep;
        !           155:        unsigned long   d_status_resid;
        !           156: };
        !           157: 
        !           158: typedef struct dbdma_command dbdma_command_t;
        !           159: 
        !           160: #define        DBDMA_BUILD(d, cmd, key, count, address, interrupt, wait, branch) {\
        !           161:                DBDMA_ST4_ENDIAN(&d->d_address, address); \
        !           162:                (d)->d_status_resid = 0; \
        !           163:                (d)->d_cmddep = 0; \
        !           164:                DBDMA_ST4_ENDIAN(&d->d_cmd_count, \
        !           165:                                ((cmd) << 28) | ((key) << 24) |\
        !           166:                                ((interrupt) << 20) |\
        !           167:                                ((branch) << 18) | ((wait) << 16) | \
        !           168:                                (count)); \
        !           169:        }
        !           170: 
        !           171: static __inline__ unsigned 
        !           172: endianswap32bit(unsigned value)
        !           173: {
        !           174:     register unsigned  temp;
        !           175:        
        !           176:     temp = ((value & 0xFF000000) >> 24);
        !           177:     temp |= ((value & 0x00FF0000) >> 8);
        !           178:     temp |= ((value & 0x0000FF00) << 8);
        !           179:     temp |= ((value & 0x000000FF) << 24);
        !           180:     return (temp);
        !           181: }
        !           182: 
        !           183: static __inline__ void
        !           184: dbdma_st4_endian(volatile unsigned long *a, unsigned long x)
        !           185: {
        !           186:     *a = endianswap32bit(x);
        !           187: #if 0
        !           188:        __asm__ volatile
        !           189:                ("stwbrx %0,0,%1" : : "r" (x), "r" (a) : "memory");
        !           190: #endif
        !           191:     return;
        !           192: }
        !           193: 
        !           194: static __inline__ unsigned long
        !           195: dbdma_ld4_endian(volatile unsigned long *a)
        !           196: {
        !           197: #if 0
        !           198:     unsigned long swap;
        !           199: #endif
        !           200: 
        !           201:     return (endianswap32bit(*a));
        !           202: #if 0
        !           203:        __asm__ volatile
        !           204:                ("lwbrx %0,0,%1" :  "=r" (swap) : "r" (a));
        !           205: 
        !           206:        return  swap;
        !           207: #endif
        !           208: }
        !           209: 
        !           210: #define        DBDMA_LD4_ENDIAN(a)     dbdma_ld4_endian(a)
        !           211: #define        DBDMA_ST4_ENDIAN(a, x)  dbdma_st4_endian(a, x)
        !           212: 
        !           213: /*
        !           214:  * DBDMA Channel layout
        !           215:  *
        !           216:  * NOTE - This structure is in little-endian format. 
        !           217:  */
        !           218: 
        !           219: struct dbdma_regmap {
        !           220:        volatile unsigned long  d_control;      /* Control Register */
        !           221:        volatile unsigned long  d_status;       /* DBDMA Status Register */
        !           222:        volatile unsigned long  d_cmdptrhi;     /* MSB of command pointer (not used yet) */
        !           223:        volatile unsigned long  d_cmdptrlo;     /* LSB of command pointer */
        !           224:        volatile unsigned long  d_intselect;    /* Interrupt Select */
        !           225:        volatile unsigned long  d_branch;       /* Branch selection */
        !           226:        volatile unsigned long  d_wait;         /* Wait selection */
        !           227:        volatile unsigned long  d_transmode;    /* Transfer modes */
        !           228:        volatile unsigned long  d_dataptrhi;    /* MSB of Data Pointer */
        !           229:        volatile unsigned long  d_dataptrlo;    /* LSB of Data Pointer */
        !           230:        volatile unsigned long  d_reserved;     /* Reserved for the moment */
        !           231:        volatile unsigned long  d_branchptrhi;  /* MSB of Branch Pointer */
        !           232:        volatile unsigned long  d_branchptrlo;  /* LSB of Branch Pointer */
        !           233:        /* The remaining fields are undefinied and unimplemented */
        !           234: };
        !           235: 
        !           236: typedef struct dbdma_regmap dbdma_regmap_t;
        !           237: 
        !           238: /* DBDMA routines */
        !           239: 
        !           240: void   dbdma_start(int channel, dbdma_command_t *commands);
        !           241: void   dbdma_stop(int channel);        
        !           242: void   dbdma_flush(int channel);
        !           243: void   dbdma_reset(int channel);
        !           244: void   dbdma_continue(int channel);
        !           245: void   dbdma_pause(int channel);
        !           246: 
        !           247: dbdma_command_t        *dbdma_alloc(int);      /* Allocate command structures */
        !           248: 
        !           249: #endif /* !defined(_POWERMAC_DBDMA_H_) */

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