1 /*

     2  * PowerMac descriptor-based DMA emulation

     3  *

     4  * Copyright (c) 2005-2007 Fabrice Bellard

     5  * Copyright (c) 2007 Jocelyn Mayer

     6  *

     7  * Permission is hereby granted, free of charge, to any person obtaining a copy

     8  * of this software and associated documentation files (the "Software"), to deal

     9  * in the Software without restriction, including without limitation the rights

    10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

    11  * copies of the Software, and to permit persons to whom the Software is

    12  * furnished to do so, subject to the following conditions:

    13  *

    14  * The above copyright notice and this permission notice shall be included in

    15  * all copies or substantial portions of the Software.

    16  *

    17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

    20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

    23  * THE SOFTWARE.

    24  */

    25 #include "hw.h"

    26 #include "ppc_mac.h"

    27 

    28 /* DBDMA: currently no op - should suffice right now */

    29 

    30 static void dbdma_writeb (void *opaque,

    31                           target_phys_addr_t addr, uint32_t value)

    32 {

    33     printf("%s: 0x" PADDRX " <= 0x%08x\n", __func__, addr, value);

    34 }

    35 

    36 static void dbdma_writew (void *opaque,

    37                           target_phys_addr_t addr, uint32_t value)

    38 {

    39 }

    40 

    41 static void dbdma_writel (void *opaque,

    42                           target_phys_addr_t addr, uint32_t value)

    43 {

    44 }

    45 

    46 static uint32_t dbdma_readb (void *opaque, target_phys_addr_t addr)

    47 {

    48     printf("%s: 0x" PADDRX " => 0x00000000\n", __func__, addr);

    49 

    50     return 0;

    51 }

    52 

    53 static uint32_t dbdma_readw (void *opaque, target_phys_addr_t addr)

    54 {

    55     return 0;

    56 }

    57 

    58 static uint32_t dbdma_readl (void *opaque, target_phys_addr_t addr)

    59 {

    60     return 0;

    61 }

    62 

    63 static CPUWriteMemoryFunc *dbdma_write[] = {

    64     &dbdma_writeb,

    65     &dbdma_writew,

    66     &dbdma_writel,

    67 };

    68 

    69 static CPUReadMemoryFunc *dbdma_read[] = {

    70     &dbdma_readb,

    71     &dbdma_readw,

    72     &dbdma_readl,

    73 };

    74 

    75 void dbdma_init (int *dbdma_mem_index)

    76 {

    77     *dbdma_mem_index = cpu_register_io_memory(0, dbdma_read, dbdma_write, NULL);

    78 }