hw/cs4231.c

   1 /*
   2  * QEMU Crystal CS4231 audio chip emulation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "sun4m.h"
  26
  27 /* debug CS4231 */
  28 //#define DEBUG_CS
  29
  30 /*
  31  * In addition to Crystal CS4231 there is a DMA controller on Sparc.
  32  */
  33 #define CS_SIZE 0x40
  34 #define CS_REGS 16
  35 #define CS_DREGS 32
  36 #define CS_MAXDREG (CS_DREGS - 1)
  37
  38 typedef struct CSState {
  39     uint32_t regs[CS_REGS];
  40     uint8_t dregs[CS_DREGS];
  41     void *intctl;
  42 } CSState;
  43
  44 #define CS_RAP(s) ((s)->regs[0] & CS_MAXDREG)
  45 #define CS_VER 0xa0
  46 #define CS_CDC_VER 0x8a
  47
  48 #ifdef DEBUG_CS
  49 #define DPRINTF(fmt, args...)                           \
  50     do { printf("CS: " fmt , ##args); } while (0)
  51 #else
  52 #define DPRINTF(fmt, args...)
  53 #endif
  54
  55 static void cs_reset(void *opaque)
  56 {
  57     CSState *s = opaque;
  58
  59     memset(s->regs, 0, CS_REGS * 4);
  60     memset(s->dregs, 0, CS_DREGS);
  61     s->dregs[12] = CS_CDC_VER;
  62     s->dregs[25] = CS_VER;
  63 }
  64
  65 static uint32_t cs_mem_readl(void *opaque, target_phys_addr_t addr)
  66 {
  67     CSState *s = opaque;
  68     uint32_t saddr, ret;
  69
  70     saddr = addr >> 2;
  71     switch (saddr) {
  72     case 1:
  73         switch (CS_RAP(s)) {
  74         case 3: // Write only
  75             ret = 0;
  76             break;
  77         default:
  78             ret = s->dregs[CS_RAP(s)];
  79             break;
  80         }
  81         DPRINTF("read dreg[%d]: 0x%8.8x\n", CS_RAP(s), ret);
  82         break;
  83     default:
  84         ret = s->regs[saddr];
  85         DPRINTF("read reg[%d]: 0x%8.8x\n", saddr, ret);
  86         break;
  87     }
  88     return ret;
  89 }
  90
  91 static void cs_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
  92 {
  93     CSState *s = opaque;
  94     uint32_t saddr;
  95
  96     saddr = addr >> 2;
  97     DPRINTF("write reg[%d]: 0x%8.8x -> 0x%8.8x\n", saddr, s->regs[saddr], val);
  98     switch (saddr) {
  99     case 1:
 100         DPRINTF("write dreg[%d]: 0x%2.2x -> 0x%2.2x\n", CS_RAP(s),
 101                 s->dregs[CS_RAP(s)], val);
 102         switch(CS_RAP(s)) {
 103         case 11:
 104         case 25: // Read only
 105             break;
 106         case 12:
 107             val &= 0x40;
 108             val |= CS_CDC_VER; // Codec version
 109             s->dregs[CS_RAP(s)] = val;
 110             break;
 111         default:
 112             s->dregs[CS_RAP(s)] = val;
 113             break;
 114         }
 115         break;
 116     case 2: // Read only
 117         break;
 118     case 4:
 119         if (val & 1)
 120             cs_reset(s);
 121         val &= 0x7f;
 122         s->regs[saddr] = val;
 123         break;
 124     default:
 125         s->regs[saddr] = val;
 126         break;
 127     }
 128 }
 129
 130 static CPUReadMemoryFunc *cs_mem_read[3] = {
 131     cs_mem_readl,
 132     cs_mem_readl,
 133     cs_mem_readl,
 134 };
 135
 136 static CPUWriteMemoryFunc *cs_mem_write[3] = {
 137     cs_mem_writel,
 138     cs_mem_writel,
 139     cs_mem_writel,
 140 };
 141
 142 static void cs_save(QEMUFile *f, void *opaque)
 143 {
 144     CSState *s = opaque;
 145     unsigned int i;
 146
 147     for (i = 0; i < CS_REGS; i++)
 148         qemu_put_be32s(f, &s->regs[i]);
 149
 150     qemu_put_buffer(f, s->dregs, CS_DREGS);
 151 }
 152
 153 static int cs_load(QEMUFile *f, void *opaque, int version_id)
 154 {
 155     CSState *s = opaque;
 156     unsigned int i;
 157
 158     if (version_id > 1)
 159         return -EINVAL;
 160
 161     for (i = 0; i < CS_REGS; i++)
 162         qemu_get_be32s(f, &s->regs[i]);
 163
 164     qemu_get_buffer(f, s->dregs, CS_DREGS);
 165     return 0;
 166 }
 167
 168 void cs_init(target_phys_addr_t base, int irq, void *intctl)
 169 {
 170     int cs_io_memory;
 171     CSState *s;
 172
 173     s = qemu_mallocz(sizeof(CSState));
 174
 175     cs_io_memory = cpu_register_io_memory(0, cs_mem_read, cs_mem_write, s);
 176     cpu_register_physical_memory(base, CS_SIZE, cs_io_memory);
 177     register_savevm("cs4231", base, 1, cs_save, cs_load, s);
 178     qemu_register_reset(cs_reset, s);
 179     cs_reset(s);
 180 }