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: }
   79: