/[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 22 by dpavlin, Mon Oct 8 16:19:37 2007 UTC revision 32 by dpavlin, Mon Oct 8 16:20:58 2007 UTC
# Line 25  Line 25 
25   *  SUCH DAMAGE.   *  SUCH DAMAGE.
26   *     *  
27   *   *
28   *  $Id: dev_ns16550.c,v 1.51 2006/02/18 13:42:39 debug Exp $   *  $Id: dev_ns16550.c,v 1.55 2006/10/27 13:12:21 debug Exp $
29   *     *  
30   *  NS16550 serial controller.   *  NS16550 serial controller.
31   *   *
# Line 72  struct ns_data { Line 72  struct ns_data {
72  };  };
73    
74    
75  /*  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)  
76  {  {
77            /*
78             *  This function is called at regular intervals. An interrupt is
79             *  asserted if there is a character available for reading, or if the
80             *  transmitter slot is empty (i.e. the ns16550 is ready to transmit).
81             */
82          struct ns_data *d = extra;          struct ns_data *d = extra;
83    
84          d->reg[com_iir] &= ~IIR_RXRDY;          d->reg[com_iir] &= ~IIR_RXRDY;
# Line 91  void dev_ns16550_tick(struct cpu *cpu, v Line 89  void dev_ns16550_tick(struct cpu *cpu, v
89           *  If interrupts are enabled, and interrupts are pending, then           *  If interrupts are enabled, and interrupts are pending, then
90           *  cause a CPU interrupt.           *  cause a CPU interrupt.
91           */           */
92    
93          if (((d->reg[com_ier] & IER_ETXRDY) && (d->reg[com_iir] & IIR_TXRDY)) ||          if (((d->reg[com_ier] & IER_ETXRDY) && (d->reg[com_iir] & IIR_TXRDY)) ||
94              ((d->reg[com_ier] & IER_ERXRDY) && (d->reg[com_iir] & IIR_RXRDY))) {              ((d->reg[com_ier] & IER_ERXRDY) && (d->reg[com_iir] & IIR_RXRDY))) {
95                  d->reg[com_iir] &= ~IIR_NOPEND;                  d->reg[com_iir] &= ~IIR_NOPEND;
# Line 214  DEVICE_ACCESS(ns16550) Line 213  DEVICE_ACCESS(ns16550)
213                          d->fcr = idata;                          d->fcr = idata;
214                  } else {                  } else {
215                          odata = d->reg[com_iir];                          odata = d->reg[com_iir];
216                            if (d->reg[com_iir] & IIR_TXRDY)
217                                    d->reg[com_iir] &= ~IIR_TXRDY;
218                          debug("[ ns16550 (%s): read from iir: 0x%02x ]\n",                          debug("[ ns16550 (%s): read from iir: 0x%02x ]\n",
219                              d->name, (int)odata);                              d->name, (int)odata);
220                          dev_ns16550_tick(cpu, d);                          dev_ns16550_tick(cpu, d);
# Line 287  DEVICE_ACCESS(ns16550) Line 288  DEVICE_ACCESS(ns16550)
288                          d->reg[com_mcr] = idata;                          d->reg[com_mcr] = idata;
289                          debug("[ ns16550 (%s): write to mcr: 0x%02x ]\n",                          debug("[ ns16550 (%s): write to mcr: 0x%02x ]\n",
290                              d->name, (int)idata);                              d->name, (int)idata);
291                            if (!(d->reg[com_iir] & IIR_TXRDY)
292                                && (idata & MCR_IENABLE))
293                                    d->reg[com_iir] |= IIR_TXRDY;
294                            dev_ns16550_tick(cpu, d);
295                  } else {                  } else {
296                          odata = d->reg[com_mcr];                          odata = d->reg[com_mcr];
297                          debug("[ ns16550 (%s): read from mcr: 0x%02x ]\n",                          debug("[ ns16550 (%s): read from mcr: 0x%02x ]\n",
# Line 358  DEVINIT(ns16550) Line 363  DEVINIT(ns16550)
363              DEV_NS16550_LENGTH * d->addrmult, dev_ns16550_access, d,              DEV_NS16550_LENGTH * d->addrmult, dev_ns16550_access, d,
364              DM_DEFAULT, NULL);              DM_DEFAULT, NULL);
365          machine_add_tickfunction(devinit->machine,          machine_add_tickfunction(devinit->machine,
366              dev_ns16550_tick, d, TICK_SHIFT);              dev_ns16550_tick, d, TICK_SHIFT, 0.0);
367    
368          /*          /*
369           *  NOTE:  Ugly cast into a pointer, because this is a convenient way           *  NOTE:  Ugly cast into a pointer, because this is a convenient way
Legend:
Removed from v.22  
changed lines
  Added in v.32
  ViewVC Help
Powered by ViewVC 1.1.26