/[gxemul]/trunk/src/devices/dev_footbridge.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 17 by dpavlin, Mon Oct 8 16:18:51 2007 UTC revision 18 by dpavlin, Mon Oct 8 16:19:11 2007 UTC
# Line 25  Line 25 
25   *  SUCH DAMAGE.   *  SUCH DAMAGE.
26   *   *
27   *   *
28   *  $Id: dev_footbridge.c,v 1.22 2005/10/07 15:10:02 debug Exp $   *  $Id: dev_footbridge.c,v 1.26 2005/10/26 14:37:04 debug Exp $
29   *   *
30   *  Footbridge. Used in Netwinder and Cats.   *  Footbridge. Used in Netwinder and Cats.
31   *   *
32   *  TODO: Most things. For example:   *  TODO: Most things. For example:
33   *   *
34     *      o)  Fix the timer TODO (see below).
35     *
36   *      o)  Add actual support for the fcom serial port.   *      o)  Add actual support for the fcom serial port.
37     *
38   *      o)  FIQs.   *      o)  FIQs.
39   *      o)  Lots of other things.   *
40     *      o)  ..
41   */   */
42    
43  #include <stdio.h>  #include <stdio.h>
# Line 54  Line 58 
58    
59  #define DEV_FOOTBRIDGE_TICK_SHIFT       14  #define DEV_FOOTBRIDGE_TICK_SHIFT       14
60  #define DEV_FOOTBRIDGE_LENGTH           0x400  #define DEV_FOOTBRIDGE_LENGTH           0x400
61    #define TIMER_POLL_THRESHOLD            15
62    
63    
64  /*  /*
# Line 68  void dev_footbridge_tick(struct cpu *cpu Line 73  void dev_footbridge_tick(struct cpu *cpu
73          int i;          int i;
74          struct footbridge_data *d = (struct footbridge_data *) extra;          struct footbridge_data *d = (struct footbridge_data *) extra;
75    
76            if (!d->timer_being_read)
77                    d->timer_poll_mode = 0;
78    
79          for (i=0; i<N_FOOTBRIDGE_TIMERS; i++) {          for (i=0; i<N_FOOTBRIDGE_TIMERS; i++) {
80                  int amount = 1 << DEV_FOOTBRIDGE_TICK_SHIFT;                  int amount = 1 << DEV_FOOTBRIDGE_TICK_SHIFT;
81                  if (d->timer_control[i] & TIMER_FCLK_16)                  if (d->timer_control[i] & TIMER_FCLK_16)
# Line 110  int dev_footbridge_isa_access(struct cpu Line 118  int dev_footbridge_isa_access(struct cpu
118          uint64_t idata = 0, odata = 0;          uint64_t idata = 0, odata = 0;
119          int x;          int x;
120    
121          idata = memory_readmax64(cpu, data, len);          if (writeflag == MEM_WRITE) {
122                    idata = memory_readmax64(cpu, data, len);
         if (writeflag == MEM_WRITE)  
123                  fatal("[ footbridge_isa: WARNING/TODO: write! ]\n");                  fatal("[ footbridge_isa: WARNING/TODO: write! ]\n");
124            }
125    
126          /*          /*
127           *  NetBSD seems to want a value of 0x20 + x, where x is the highest           *  NetBSD seems to want a value of 0x20 + x, where x is the highest
# Line 162  int dev_footbridge_pci_access(struct cpu Line 170  int dev_footbridge_pci_access(struct cpu
170          int bus, device, function, regnr, res;          int bus, device, function, regnr, res;
171          uint64_t pci_word;          uint64_t pci_word;
172    
173          idata = memory_readmax64(cpu, data, len);          if (writeflag == MEM_WRITE)
174                    idata = memory_readmax64(cpu, data, len);
175    
176          bus      = (relative_addr >> 16) & 0xff;          bus      = (relative_addr >> 16) & 0xff;
177          device   = (relative_addr >> 11) & 0x1f;          device   = (relative_addr >> 11) & 0x1f;
# Line 218  int dev_footbridge_access(struct cpu *cp Line 227  int dev_footbridge_access(struct cpu *cp
227          uint64_t idata = 0, odata = 0;          uint64_t idata = 0, odata = 0;
228          int timer_nr = 0;          int timer_nr = 0;
229    
230          idata = memory_readmax64(cpu, data, len);          if (writeflag == MEM_WRITE)
231                    idata = memory_readmax64(cpu, data, len);
232    
233          if (relative_addr >= TIMER_1_LOAD && relative_addr <= TIMER_4_CLEAR) {          if (relative_addr >= TIMER_1_LOAD && relative_addr <= TIMER_4_CLEAR) {
234                  timer_nr = (relative_addr >> 5) & (N_FOOTBRIDGE_TIMERS - 1);                  timer_nr = (relative_addr >> 5) & (N_FOOTBRIDGE_TIMERS - 1);
# Line 276  int dev_footbridge_access(struct cpu *cp Line 286  int dev_footbridge_access(struct cpu *cp
286                          d->irq_enable |= idata;                          d->irq_enable |= idata;
287                          cpu_interrupt(cpu, 64);                          cpu_interrupt(cpu, 64);
288                  } else {                  } else {
289                            odata = d->irq_enable;
290                          fatal("[ WARNING: footbridge read from "                          fatal("[ WARNING: footbridge read from "
291                              "ENABLE SET? ]\n");                              "ENABLE SET? ]\n");
292                          exit(1);                          exit(1);
                         odata = d->irq_enable;  
293                  }                  }
294                  break;                  break;
295    
# Line 288  int dev_footbridge_access(struct cpu *cp Line 298  int dev_footbridge_access(struct cpu *cp
298                          d->irq_enable &= ~idata;                          d->irq_enable &= ~idata;
299                          cpu_interrupt(cpu, 64);                          cpu_interrupt(cpu, 64);
300                  } else {                  } else {
301                            odata = d->irq_enable;
302                          fatal("[ WARNING: footbridge read from "                          fatal("[ WARNING: footbridge read from "
303                              "ENABLE CLEAR? ]\n");                              "ENABLE CLEAR? ]\n");
304                          exit(1);                          exit(1);
                         odata = d->irq_enable;  
305                  }                  }
306                  break;                  break;
307    
# Line 338  int dev_footbridge_access(struct cpu *cp Line 348  int dev_footbridge_access(struct cpu *cp
348    
349          case TIMER_1_VALUE:          case TIMER_1_VALUE:
350                  if (writeflag == MEM_READ) {                  if (writeflag == MEM_READ) {
351                          dev_footbridge_tick(cpu, d);                          /*
352                             *  TODO: This is INCORRECT! but speeds up NetBSD
353                             *  and OpenBSD boot sequences. A better solution
354                             *  would be to only call dev_footbridge_tick() if
355                             *  the timer is polled "very often" (such as during
356                             *  bootup), but not during normal operation.
357                             */
358                            d->timer_being_read = 1;
359                            d->timer_poll_mode ++;
360                            if (d->timer_poll_mode > TIMER_POLL_THRESHOLD)
361                                    dev_footbridge_tick(cpu, d);
362                          odata = d->timer_value[timer_nr];                          odata = d->timer_value[timer_nr];
363                            d->timer_being_read = 0;
364                  } else                  } else
365                          d->timer_value[timer_nr] = idata & TIMER_MAX_VAL;                          d->timer_value[timer_nr] = idata & TIMER_MAX_VAL;
366                  break;                  break;
# Line 425  int devinit_footbridge(struct devinit *d Line 446  int devinit_footbridge(struct devinit *d
446                  bus_pci_add(devinit->machine, d->pcibus,                  bus_pci_add(devinit->machine, d->pcibus,
447                      devinit->machine->memory, 0xc0, 7, 0,                      devinit->machine->memory, 0xc0, 7, 0,
448                      pci_ali_m1543_init, pci_ali_m1543_rr);                      pci_ali_m1543_init, pci_ali_m1543_rr);
449                    /*  bus_pci_add(devinit->machine, d->pcibus,
450                        devinit->machine->memory, 0xc0, 10, 0,
451                        pci_dec21143_init, pci_dec21143_rr);  */
452                  bus_pci_add(devinit->machine, d->pcibus,                  bus_pci_add(devinit->machine, d->pcibus,
453                      devinit->machine->memory, 0xc0, 16, 0,                      devinit->machine->memory, 0xc0, 16, 0,
454                      pci_ali_m5229_init, pci_ali_m5229_rr);                      pci_ali_m5229_init, pci_ali_m5229_rr);
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