/[gxemul]/trunk/src/devices/dev_ns16550.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
ViewVC logotype

Diff of /trunk/src/devices/dev_ns16550.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 24 by dpavlin, Mon Oct 8 16:19:56 2007 UTC revision 34 by dpavlin, Mon Oct 8 16:21:17 2007 UTC
# Line 1  Line 1 
1  /*  /*
2   *  Copyright (C) 2003-2006  Anders Gavare.  All rights reserved.   *  Copyright (C) 2003-2007  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_ns16550.c,v 1.54 2006/04/06 18:08:42 debug Exp $   *  $Id: dev_ns16550.c,v 1.58 2006/12/30 13:30:58 debug Exp $
29   *     *  
30   *  NS16550 serial controller.   *  NS16550 serial controller.
31   *   *
# Line 40  Line 40 
40  #include "console.h"  #include "console.h"
41  #include "cpu.h"  #include "cpu.h"
42  #include "device.h"  #include "device.h"
43    #include "interrupt.h"
44  #include "machine.h"  #include "machine.h"
45  #include "memory.h"  #include "memory.h"
46  #include "misc.h"  #include "misc.h"
# Line 55  Line 56 
56  struct ns_data {  struct ns_data {
57          int             addrmult;          int             addrmult;
58          int             in_use;          int             in_use;
         int             irqnr;  
59          char            *name;          char            *name;
60          int             console_handle;          int             console_handle;
61          int             enable_fifo;          int             enable_fifo;
62    
63            struct interrupt irq;
64    
65          unsigned char   reg[DEV_NS16550_LENGTH];          unsigned char   reg[DEV_NS16550_LENGTH];
66          unsigned char   fcr;            /*  FIFO control register  */          unsigned char   fcr;            /*  FIFO control register  */
67          int             int_asserted;          int             int_asserted;
# Line 72  struct ns_data { Line 74  struct ns_data {
74  };  };
75    
76    
77  /*  DEVICE_TICK(ns16550)
  *  dev_ns16550_tick():  
  *  
  *  This function is called at regular intervals. An interrupt is caused to the  
  *  CPU if there is a character available for reading, or if the transmitter  
  *  slot is empty (i.e. the ns16550 is ready to transmit).  
  */  
 void dev_ns16550_tick(struct cpu *cpu, void *extra)  
78  {  {
79            /*
80             *  This function is called at regular intervals. An interrupt is
81             *  asserted if there is a character available for reading, or if the
82             *  transmitter slot is empty (i.e. the ns16550 is ready to transmit).
83             */
84          struct ns_data *d = extra;          struct ns_data *d = extra;
85    
86          d->reg[com_iir] &= ~IIR_RXRDY;          d->reg[com_iir] &= ~IIR_RXRDY;
# Line 96  void dev_ns16550_tick(struct cpu *cpu, v Line 96  void dev_ns16550_tick(struct cpu *cpu, v
96              ((d->reg[com_ier] & IER_ERXRDY) && (d->reg[com_iir] & IIR_RXRDY))) {              ((d->reg[com_ier] & IER_ERXRDY) && (d->reg[com_iir] & IIR_RXRDY))) {
97                  d->reg[com_iir] &= ~IIR_NOPEND;                  d->reg[com_iir] &= ~IIR_NOPEND;
98                  if (d->reg[com_mcr] & MCR_IENABLE) {                  if (d->reg[com_mcr] & MCR_IENABLE) {
99                          cpu_interrupt(cpu, d->irqnr);                          INTERRUPT_ASSERT(d->irq);
100                          d->int_asserted = 1;                          d->int_asserted = 1;
101                  }                  }
102          } else {          } else {
103                  d->reg[com_iir] |= IIR_NOPEND;                  d->reg[com_iir] |= IIR_NOPEND;
104                  if (d->int_asserted)                  if (d->int_asserted)
105                          cpu_interrupt_ack(cpu, d->irqnr);                          INTERRUPT_DEASSERT(d->irq);
106                  d->int_asserted = 0;                  d->int_asserted = 0;
107          }          }
108  }  }
109    
110    
 /*  
  *  dev_ns16550_access():  
  */  
111  DEVICE_ACCESS(ns16550)  DEVICE_ACCESS(ns16550)
112  {  {
113          uint64_t idata = 0, odata=0;          uint64_t idata = 0, odata=0;
# Line 334  DEVINIT(ns16550) Line 331  DEVINIT(ns16550)
331                  exit(1);                  exit(1);
332          }          }
333          memset(d, 0, sizeof(struct ns_data));          memset(d, 0, sizeof(struct ns_data));
334          d->irqnr        = devinit->irq_nr;  
335          d->addrmult     = devinit->addr_mult;          d->addrmult     = devinit->addr_mult;
336          d->in_use       = devinit->in_use;          d->in_use       = devinit->in_use;
337          d->enable_fifo  = 1;          d->enable_fifo  = 1;
# Line 348  DEVINIT(ns16550) Line 345  DEVINIT(ns16550)
345              console_start_slave(devinit->machine, devinit->name2 != NULL?              console_start_slave(devinit->machine, devinit->name2 != NULL?
346              devinit->name2 : devinit->name, d->in_use);              devinit->name2 : devinit->name, d->in_use);
347    
348            INTERRUPT_CONNECT(devinit->interrupt_path, d->irq);
349    
350          nlen = strlen(devinit->name) + 10;          nlen = strlen(devinit->name) + 10;
351          if (devinit->name2 != NULL)          if (devinit->name2 != NULL)
352                  nlen += strlen(devinit->name2);                  nlen += strlen(devinit->name2);
Legend:
Removed from v.24  
changed lines
  Added in v.34
  ViewVC Help
Powered by ViewVC 1.1.26