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_MAXADDR 0x3f
  34 #define CS_SIZE (CS_MAXADDR + 1)
  35 #define CS_REGS 16
  36 #define CS_DREGS 32
  37 #define CS_MAXDREG (CS_DREGS - 1)
  38
  39 typedef struct CSState {
  40     uint32_t regs[CS_REGS];
  41     uint8_t dregs[CS_DREGS];
  42     void *intctl;
  43 } CSState;
  44
  45 #define CS_RAP(s) ((s)->regs[0] & CS_MAXDREG)
  46 #define CS_VER 0xa0
  47 #define CS_CDC_VER 0x8a
  48
  49 #ifdef DEBUG_CS
  50 #define DPRINTF(fmt, args...)                           \
  51     do { printf("CS: " fmt , ##args); } while (0)
  52 #else
  53 #define DPRINTF(fmt, args...)
  54 #endif
  55
  56 static void cs_reset(void *opaque)
  57 {
  58     CSState *s = opaque;
  59
  60     memset(s->regs, 0, CS_REGS * 4);
  61     memset(s->dregs, 0, CS_DREGS);
  62     s->dregs[12] = CS_CDC_VER;
  63     s->dregs[25] = CS_VER;
  64 }
  65
  66 static uint32_t cs_mem_readl(void *opaque, target_phys_addr_t addr)
  67 {
  68     CSState *s = opaque;
  69     uint32_t saddr, ret;
  70
  71     saddr = (addr & CS_MAXADDR) >> 2;
  72     switch (saddr) {
  73     case 1:
  74         switch (CS_RAP(s)) {
  75         case 3: // Write only
  76             ret = 0;
  77             break;
  78         default:
  79             ret = s->dregs[CS_RAP(s)];
  80             break;
  81         }
  82         DPRINTF("read dreg[%d]: 0x%8.8x\n", CS_RAP(s), ret);
  83         break;
  84     default:
  85         ret = s->regs[saddr];
  86         DPRINTF("read reg[%d]: 0x%8.8x\n", saddr, ret);
  87         break;
  88     }
  89     return ret;
  90 }
  91
  92 static void cs_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
  93 {
  94     CSState *s = opaque;
  95     uint32_t saddr;
  96
  97     saddr = (addr & CS_MAXADDR) >> 2;
  98     DPRINTF("write reg[%d]: 0x%8.8x -> 0x%8.8x\n", saddr, s->regs[saddr], val);
  99     switch (saddr) {
 100     case 1:
 101         DPRINTF("write dreg[%d]: 0x%2.2x -> 0x%2.2x\n", CS_RAP(s),
 102                 s->dregs[CS_RAP(s)], val);
 103         switch(CS_RAP(s)) {
 104         case 11:
 105         case 25: // Read only
 106             break;
 107         case 12:
 108             val &= 0x40;
 109             val |= CS_CDC_VER; // Codec version
 110             s->dregs[CS_RAP(s)] = val;
 111             break;
 112         default:
 113             s->dregs[CS_RAP(s)] = val;
 114             break;
 115         }
 116         break;
 117     case 2: // Read only
 118         break;
 119     case 4:
 120         if (val & 1)
 121             cs_reset(s);
 122         val &= 0x7f;
 123         s->regs[saddr] = val;
 124         break;
 125     default:
 126         s->regs[saddr] = val;
 127         break;
 128     }
 129 }
 130
 131 static CPUReadMemoryFunc *cs_mem_read[3] = {
 132     cs_mem_readl,
 133     cs_mem_readl,
 134     cs_mem_readl,
 135 };
 136
 137 static CPUWriteMemoryFunc *cs_mem_write[3] = {
 138     cs_mem_writel,
 139     cs_mem_writel,
 140     cs_mem_writel,
 141 };
 142
 143 static void cs_save(QEMUFile *f, void *opaque)
 144 {
 145     CSState *s = opaque;
 146     unsigned int i;
 147
 148     for (i = 0; i < CS_REGS; i++)
 149         qemu_put_be32s(f, &s->regs[i]);
 150
 151     qemu_put_buffer(f, s->dregs, CS_DREGS);
 152 }
 153
 154 static int cs_load(QEMUFile *f, void *opaque, int version_id)
 155 {
 156     CSState *s = opaque;
 157     unsigned int i;
 158
 159     if (version_id > 1)
 160         return -EINVAL;
 161
 162     for (i = 0; i < CS_REGS; i++)
 163         qemu_get_be32s(f, &s->regs[i]);
 164
 165     qemu_get_buffer(f, s->dregs, CS_DREGS);
 166     return 0;
 167 }
 168
 169 void cs_init(target_phys_addr_t base, int irq, void *intctl)
 170 {
 171     int cs_io_memory;
 172     CSState *s;
 173
 174     s = qemu_mallocz(sizeof(CSState));
 175     if (!s)
 176         return;
 177
 178     cs_io_memory = cpu_register_io_memory(0, cs_mem_read, cs_mem_write, s);
 179     cpu_register_physical_memory(base, CS_SIZE, cs_io_memory);
 180     register_savevm("cs4231", base, 1, cs_save, cs_load, s);
 181     qemu_register_reset(cs_reset, s);
 182     cs_reset(s);
 183 }