hw/mac_dbdma.c

   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 /* debug DBDMA */
  29 //#define DEBUG_DBDMA
  30
  31 #ifdef DEBUG_DBDMA
  32 #define DBDMA_DPRINTF(fmt, args...) \
  33 do { printf("DBDMA: " fmt , ##args); } while (0)
  34 #else
  35 #define DBDMA_DPRINTF(fmt, args...)
  36 #endif
  37
  38 /* DBDMA: currently no op - should suffice right now */
  39
  40 static void dbdma_writeb (void *opaque,
  41                           target_phys_addr_t addr, uint32_t value)
  42 {
  43     DBDMA_DPRINTF("writeb 0x" TARGET_FMT_plx " <= 0x%08x\n", addr, value);
  44 }
  45
  46 static void dbdma_writew (void *opaque,
  47                           target_phys_addr_t addr, uint32_t value)
  48 {
  49     DBDMA_DPRINTF("writew 0x" TARGET_FMT_plx " <= 0x%08x\n", addr, value);
  50 }
  51
  52 static void dbdma_writel (void *opaque,
  53                           target_phys_addr_t addr, uint32_t value)
  54 {
  55     DBDMA_DPRINTF("writel 0x" TARGET_FMT_plx " <= 0x%08x\n", addr, value);
  56 }
  57
  58 static uint32_t dbdma_readb (void *opaque, target_phys_addr_t addr)
  59 {
  60     DBDMA_DPRINTF("readb 0x" TARGET_FMT_plx " => 0\n", addr);
  61
  62     return 0;
  63 }
  64
  65 static uint32_t dbdma_readw (void *opaque, target_phys_addr_t addr)
  66 {
  67     DBDMA_DPRINTF("readw 0x" TARGET_FMT_plx " => 0\n", addr);
  68
  69     return 0;
  70 }
  71
  72 static uint32_t dbdma_readl (void *opaque, target_phys_addr_t addr)
  73 {
  74     DBDMA_DPRINTF("readl 0x" TARGET_FMT_plx " => 0\n", addr);
  75
  76     return 0;
  77 }
  78
  79 static CPUWriteMemoryFunc *dbdma_write[] = {
  80     &dbdma_writeb,
  81     &dbdma_writew,
  82     &dbdma_writel,
  83 };
  84
  85 static CPUReadMemoryFunc *dbdma_read[] = {
  86     &dbdma_readb,
  87     &dbdma_readw,
  88     &dbdma_readl,
  89 };
  90
  91 static void dbdma_save(QEMUFile *f, void *opaque)
  92 {
  93 }
  94
  95 static int dbdma_load(QEMUFile *f, void *opaque, int version_id)
  96 {
  97     if (version_id != 1)
  98         return -EINVAL;
  99
 100     return 0;
 101 }
 102
 103 static void dbdma_reset(void *opaque)
 104 {
 105 }
 106
 107 void dbdma_init (int *dbdma_mem_index)
 108 {
 109     *dbdma_mem_index = cpu_register_io_memory(0, dbdma_read, dbdma_write, NULL);
 110     register_savevm("dbdma", -1, 1, dbdma_save, dbdma_load, NULL);
 111     qemu_register_reset(dbdma_reset, NULL);
 112     dbdma_reset(NULL);
 113 }