hw/arm/ch7xxx.c

   1 /* Chrontel 7xxx (7006 in particular) stub implementation.
   2  *
   3  * Copyright 2008 Daniel Silverstone <dsilvers@simtec.co.uk> and
   4  * Vincent Sanders <vince@simtec.co.uk>
   5  *
   6  * Copyright 2010, 2012 Stefan Weil
   7  *
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "qemu-common.h"
  12 #include "hw/i2c/i2c.h"
  13
  14 //#define DBF(X...) fprintf(stderr, "QEMU:ch7xxx:" X)
  15 #define DBF(X...)
  16
  17 typedef struct {
  18   I2CSlave i2c;
  19   int reg;
  20   int wridx;
  21 } CH7xxxState;
  22
  23 static int
  24 ch7xxx_rx(I2CSlave *i2c)
  25 {
  26     CH7xxxState *s = (CH7xxxState *)i2c;
  27     DBF("RX?\n");
  28
  29     switch (s->reg) {
  30     case 0x25:
  31       return 0x2A; /* CH7006 ID */
  32     }
  33
  34     return 0x00;
  35 }
  36
  37 static int
  38 ch7xxx_tx(I2CSlave *i2c, uint8_t data)
  39 {
  40   DBF("TX: %d\n", data);
  41   CH7xxxState *s = (CH7xxxState *)i2c;
  42   if (s->wridx == 0) {
  43     s->reg = data;
  44     s->wridx++;
  45     return 0;
  46   }
  47
  48   return 0;
  49 }
  50
  51 static void
  52 ch7xxx_event(I2CSlave *i2c, enum i2c_event event)
  53 {
  54   CH7xxxState *s = (CH7xxxState *)i2c;
  55   DBF("EV? %d\n", event);
  56   switch (event) {
  57   case I2C_START_RECV:
  58     break;
  59   case I2C_START_SEND:
  60     s->wridx = 0;
  61   case I2C_FINISH:
  62   case I2C_NACK:
  63       break;
  64   }
  65 }
  66
  67 static int ch7xxx_init(I2CSlave *i2c)
  68 {
  69     //~ StcPMUState *s = FROM_I2C_SLAVE(StcPMUState, i2c);
  70   //~ StcPMUState *s = (StcPMUState *)
  71     //~ i2c_slave_init(bus, addr, sizeof(StcPMUState));
  72
  73   return 0;
  74 }
  75
  76 static const VMStateDescription vmstate_ch7xxx = {
  77     .name = "ch7xxx",
  78     .version_id = 0,
  79     .minimum_version_id = 0,
  80     .minimum_version_id_old = 0,
  81     //~ .pre_save = menelaus_pre_save,
  82     //~ .post_load = menelaus_post_load,
  83     .fields      = (VMStateField []) {
  84         VMSTATE_I2C_SLAVE(i2c, CH7xxxState),
  85         VMSTATE_END_OF_LIST()
  86     }
  87 };
  88
  89 static void ch7xx_class_init(ObjectClass *klass, void *data)
  90 {
  91     DeviceClass *dc = DEVICE_CLASS(klass);
  92     I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
  93     dc->vmsd = &vmstate_ch7xxx;
  94     k->init = ch7xxx_init;
  95     k->event = ch7xxx_event;
  96     k->recv = ch7xxx_rx;
  97     k->send = ch7xxx_tx;
  98 }
  99
 100 static const TypeInfo ch7xxx_info = {
 101     .name ="ch7xxx",
 102     .parent = TYPE_I2C_SLAVE,
 103     .instance_size = sizeof(CH7xxxState),
 104     .class_init = ch7xx_class_init,
 105 };
 106
 107 static void ch7xxx_register_types(void)
 108 {
 109     type_register_static(&ch7xxx_info);
 110 }
 111
 112 type_init(ch7xxx_register_types)