/[gxemul]/trunk/src/devices/dev_dc7085.c
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revision 20 by dpavlin, Mon Oct 8 16:19:23 2007 UTC revision 32 by dpavlin, Mon Oct 8 16:20:58 2007 UTC
# Line 1  Line 1 
1  /*  /*
2   *  Copyright (C) 2003-2005  Anders Gavare.  All rights reserved.   *  Copyright (C) 2003-2006  Anders Gavare.  All rights reserved.
3   *   *
4   *  Redistribution and use in source and binary forms, with or without   *  Redistribution and use in source and binary forms, with or without
5   *  modification, are permitted provided that the following conditions are met:   *  modification, are permitted provided that the following conditions are met:
# Line 25  Line 25 
25   *  SUCH DAMAGE.   *  SUCH DAMAGE.
26   *     *  
27   *   *
28   *  $Id: dev_dc7085.c,v 1.51 2005/11/13 00:14:08 debug Exp $   *  $Id: dev_dc7085.c,v 1.58 2006/09/06 04:55:35 debug Exp $
29   *     *  
30   *  DC7085 serial controller, used in some DECstation models.   *  DC7085 serial controller, used in some DECstation models.
31   */   */
# Line 46  Line 46 
46    
47  #define DC_TICK_SHIFT           14  #define DC_TICK_SHIFT           14
48    
49  #define MAX_QUEUE_LEN           4096  #define MAX_QUEUE_LEN           32768
50    
51  struct dc_data {  struct dc_data {
52          struct dc7085regs       regs;          struct dc7085regs       regs;
# Line 78  void add_to_rx_queue(void *e, int ch, in Line 78  void add_to_rx_queue(void *e, int ch, in
78          struct dc_data *d = (struct dc_data *) e;          struct dc_data *d = (struct dc_data *) e;
79          int entries_in_use = d->cur_rx_queue_pos_write -          int entries_in_use = d->cur_rx_queue_pos_write -
80              d->cur_rx_queue_pos_read;              d->cur_rx_queue_pos_read;
81    
82          while (entries_in_use < 0)          while (entries_in_use < 0)
83                  entries_in_use += MAX_QUEUE_LEN;                  entries_in_use += MAX_QUEUE_LEN;
84    
# Line 96  void add_to_rx_queue(void *e, int ch, in Line 97  void add_to_rx_queue(void *e, int ch, in
97  }  }
98    
99    
100  /*  DEVICE_TICK(dc7085)
  *  dev_dc7085_tick():  
  *  
  *  This function is called "every now and then".  
  *  If a key is available from the keyboard, add it to the rx queue.  
  *  If other bits are set, an interrupt might need to be caused.  
  */  
 void dev_dc7085_tick(struct cpu *cpu, void *extra)  
101  {  {
102            /*
103             *  If a key is available from the keyboard, add it to the rx queue.
104             *  If other bits are set, an interrupt might need to be caused.
105             */
106          struct dc_data *d = extra;          struct dc_data *d = extra;
107          int avail;          int avail;
108    
# Line 149  void dev_dc7085_tick(struct cpu *cpu, vo Line 147  void dev_dc7085_tick(struct cpu *cpu, vo
147                          return;                          return;
148          }          }
149    
150          lk201_tick(&d->lk201);          lk201_tick(cpu->machine, &d->lk201);
151    
152          avail = d->cur_rx_queue_pos_write != d->cur_rx_queue_pos_read;          avail = d->cur_rx_queue_pos_write != d->cur_rx_queue_pos_read;
153    
# Line 161  void dev_dc7085_tick(struct cpu *cpu, vo Line 159  void dev_dc7085_tick(struct cpu *cpu, vo
159  }  }
160    
161    
162  /*  DEVICE_ACCESS(dc7085)
  *  dev_dc7085_access():  
  */  
 int dev_dc7085_access(struct cpu *cpu, struct memory *mem,  
         uint64_t relative_addr, unsigned char *data, size_t len,  
         int writeflag, void *extra)  
163  {  {
164          uint64_t idata = 0, odata = 0;          uint64_t idata = 0, odata = 0;
165          int i;          size_t i;
166          struct dc_data *d = extra;          struct dc_data *d = extra;
167    
168          if (writeflag == MEM_WRITE)          if (writeflag == MEM_WRITE)
# Line 316  int dev_dc7085_init(struct machine *mach Line 309  int dev_dc7085_init(struct machine *mach
309          d->regs.dc_csr = CSR_TRDY | CSR_MSE;          d->regs.dc_csr = CSR_TRDY | CSR_MSE;
310          d->regs.dc_tcr = 0x00;          d->regs.dc_tcr = 0x00;
311    
312          d->console_handle = console_start_slave(machine, "DC7085");          d->console_handle = console_start_slave(machine, "DC7085", 1);
313    
314          lk201_init(&d->lk201, use_fb, add_to_rx_queue, d->console_handle, d);          lk201_init(&d->lk201, use_fb, add_to_rx_queue, d->console_handle, d);
315    
316          memory_device_register(mem, "dc7085", baseaddr, DEV_DC7085_LENGTH,          memory_device_register(mem, "dc7085", baseaddr, DEV_DC7085_LENGTH,
317              dev_dc7085_access, d, DM_DEFAULT, NULL);              dev_dc7085_access, d, DM_DEFAULT, NULL);
318          machine_add_tickfunction(machine, dev_dc7085_tick, d, DC_TICK_SHIFT);          machine_add_tickfunction(machine, dev_dc7085_tick, d,
319                DC_TICK_SHIFT, 0.0);
320    
321          return d->console_handle;          return d->console_handle;
322  }  }

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