source/src/vm/mc6844.h

   1 /*
   2         Skelton for retropc emulator
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2017.04.14-
   6
   7         [ MC6844 ]
   8 */
   9
  10 #ifndef _MC6844_H_
  11 #define _MC6844_H_
  12
  13 //#include "vm.h"
  14 //#include "../emu.h"
  15 #include "device.h"
  16
  17 #define SIG_MC6844_TX_RQ_0      0
  18 #define SIG_MC6844_TX_RQ_1      1
  19 #define SIG_MC6844_TX_RQ_2      2
  20 #define SIG_MC6844_TX_RQ_3      3
  21
  22 class MC6844 : public DEVICE
  23 {
  24 private:
  25         DEVICE* d_memory;
  26
  27         struct {
  28                 DEVICE *device;
  29                 pair_t address_reg;
  30                 pair_t byte_count_reg;
  31                 uint8_t channel_ctrl_reg;
  32         } dma[4];
  33
  34         uint8_t priority_ctrl_reg;
  35         uint8_t interrupt_ctrl_reg;
  36         uint8_t data_chain_reg;
  37
  38         outputs_t outputs_irq;
  39
  40         void transfer(int ch);
  41         void update_irq();
  42
  43 public:
  44         MC6844(VM_TEMPLATE* parent_vm, EMU* parent_emu) : DEVICE(parent_vm, parent_emu)
  45         {
  46                 // TIP: if((DEVICE::prev_device == NULL) || (DEVICE::this_device_id == 0)) DEVICE must be DUMMY.
  47                 // And, at this device, should not be FIRST DEVICE. 20170613 Ohta.
  48                 DEVICE *__dev = this;
  49                 while((__dev->prev_device != NULL) && (__dev->this_device_id > 0)) {
  50                         __dev = __dev->prev_device;
  51                 }
  52
  53 //              for(int i = 0; i < 4; i++) {
  54 //                      dma[i].device = vm->dummy;
  55 //              }
  56 //              d_memory = vm->dummy;
  57                 for(int i = 0; i < 4; i++) {
  58                         dma[i].device = __dev;
  59                 }
  60                 d_memory = __dev;
  61                 initialize_output_signals(&outputs_irq);
  62                 set_device_name(_T("MC6844 DMAC"));
  63         }
  64         ~MC6844() {}
  65
  66         // common functions
  67         void reset();
  68         void write_io8(uint32_t addr, uint32_t data);
  69         uint32_t read_io8(uint32_t addr);
  70         void write_signal(int id, uint32_t data, uint32_t mask);
  71         bool process_state(FILEIO* state_fio, bool loading);
  72
  73         // unique functions
  74         void set_context_memory(DEVICE* device)
  75         {
  76                 d_memory = device;
  77         }
  78         void set_context_ch0(DEVICE* device)
  79         {
  80                 dma[0].device = device;
  81         }
  82         void set_context_ch1(DEVICE* device)
  83         {
  84                 dma[1].device = device;
  85         }
  86         void set_context_ch2(DEVICE* device)
  87         {
  88                 dma[2].device = device;
  89         }
  90         void set_context_ch3(DEVICE* device)
  91         {
  92                 dma[3].device = device;
  93         }
  94 };
  95
  96 #endif
  97