| /* i8253.c: Intel i8253 PIT adapter | |
| Copyright (c) 2010, William A. Beech | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| and/or sell copies of the Software, and to permit persons to whom the | |
| Software is furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in | |
| all copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| Except as contained in this notice, the name of William A. Beech shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from William A. Beech. | |
| MODIFICATIONS: | |
| ?? ??? 10 - Original file. | |
| 16 Dec 12 - Modified to use isbc_80_10.cfg file to set base and size. | |
| 24 Apr 15 -- Modified to use simh_debug | |
| NOTES: | |
| */ | |
| #include "system_defs.h" | |
| /* external function prototypes */ | |
| extern uint16 reg_dev(uint8 (*routine)(t_bool, uint8), uint16); | |
| /* external globals */ | |
| extern uint16 port; //port called in dev_table[port] | |
| /* globals */ | |
| int32 i8253_devnum = 0; //actual number of 8253 instances + 1 | |
| uint16 i8253_port[4]; //base port registered to each instance | |
| /* function prototypes */ | |
| t_stat i8253_svc (UNIT *uptr); | |
| t_stat i8253_reset (DEVICE *dptr, uint16 base); | |
| uint8 i8253_get_dn(void); | |
| uint8 i8253t0(t_bool io, uint8 data); | |
| uint8 i8253t1(t_bool io, uint8 data); | |
| uint8 i8253t2(t_bool io, uint8 data); | |
| uint8 i8253c(t_bool io, uint8 data); | |
| /* i8253 Standard I/O Data Structures */ | |
| /* up to 4 i8253 devices */ | |
| UNIT i8253_unit[] = { | |
| { UDATA (&i8253_svc, 0, 0), 20 }, | |
| { UDATA (&i8253_svc, 0, 0), 20 }, | |
| { UDATA (&i8253_svc, 0, 0), 20 }, | |
| { UDATA (&i8253_svc, 0, 0), 20 } | |
| }; | |
| REG i8253_reg[] = { | |
| { HRDATA (T0, i8253_unit[0].u3, 8) }, | |
| { HRDATA (T1, i8253_unit[0].u4, 8) }, | |
| { HRDATA (T2, i8253_unit[0].u5, 8) }, | |
| { HRDATA (CMD, i8253_unit[0].u6, 8) }, | |
| { HRDATA (T0, i8253_unit[1].u3, 8) }, | |
| { HRDATA (T1, i8253_unit[1].u4, 8) }, | |
| { HRDATA (T2, i8253_unit[1].u5, 8) }, | |
| { HRDATA (CMD, i8253_unit[1].u6, 8) }, | |
| { NULL } | |
| }; | |
| DEBTAB i8253_debug[] = { | |
| { "ALL", DEBUG_all }, | |
| { "FLOW", DEBUG_flow }, | |
| { "READ", DEBUG_read }, | |
| { "WRITE", DEBUG_write }, | |
| { "LEV1", DEBUG_level1 }, | |
| { "LEV2", DEBUG_level2 }, | |
| { NULL } | |
| }; | |
| MTAB i8253_mod[] = { | |
| { 0 } | |
| }; | |
| /* address width is set to 16 bits to use devices in 8086/8088 implementations */ | |
| DEVICE i8253_dev = { | |
| "8251", //name | |
| i8253_unit, //units | |
| i8253_reg, //registers | |
| i8253_mod, //modifiers | |
| 1, //numunits | |
| 16, //aradix | |
| 16, //awidth | |
| 1, //aincr | |
| 16, //dradix | |
| 8, //dwidth | |
| NULL, //examine | |
| NULL, //deposit | |
| // &i8253_reset, //reset | |
| NULL, //reset | |
| NULL, //boot | |
| NULL, //attach | |
| NULL, //detach | |
| NULL, //ctxt | |
| 0, //flags | |
| 0, //dctrl | |
| i8253_debug, //debflags | |
| NULL, //msize | |
| NULL //lname | |
| }; | |
| /* Service routines to handle simulator functions */ | |
| /* i8253_svc - actually gets char & places in buffer */ | |
| t_stat i8253_svc (UNIT *uptr) | |
| { | |
| int32 temp; | |
| sim_activate (&i8253_unit[0], i8253_unit[0].wait); /* continue poll */ | |
| return SCPE_OK; | |
| } | |
| /* Reset routine */ | |
| t_stat i8253_reset (DEVICE *dptr, uint16 port) | |
| { | |
| if (i8253_devnum > I8253_NUM) { | |
| sim_printf("i8253_reset: too many devices!\n"); | |
| return SCPE_MEM; | |
| } | |
| i8253_port[i8253_devnum] = reg_dev(i8253t0, port); | |
| reg_dev(i8253t1, port + 1); | |
| reg_dev(i8253t2, port + 2); | |
| reg_dev(i8253c, port + 3); | |
| i8253_unit[i8253_devnum].u3 = 0; /* status */ | |
| i8253_unit[i8253_devnum].u4 = 0; /* mode instruction */ | |
| i8253_unit[i8253_devnum].u5 = 0; /* command instruction */ | |
| i8253_unit[i8253_devnum].u6 = 0; | |
| sim_printf(" 8253-%d: Reset\n", i8253_devnum); | |
| sim_printf(" 8253-%d: Registered at %03X\n", i8253_devnum, port); | |
| sim_activate (&i8253_unit[i8253_devnum], i8253_unit[i8253_devnum].wait); /* activate unit */ | |
| i8253_devnum++; | |
| return SCPE_OK; | |
| } | |
| uint8 i8253_get_dn(void) | |
| { | |
| int i; | |
| for (i=0; i<I8253_NUM; i++) | |
| if (port >=i8253_port[i] && port <= i8253_port[i] + 3) | |
| return i; | |
| sim_printf("i8253_get_dn: port %03X not in 8253 device table\n", port); | |
| return 0xFF; | |
| } | |
| /* I/O instruction handlers, called from the CPU module when an | |
| IN or OUT instruction is issued. | |
| */ | |
| uint8 i8253t0(t_bool io, uint8 data) | |
| { | |
| uint8 devnum; | |
| if ((devnum = i8253_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read data port */ | |
| i8253_unit[devnum].u3 = data; | |
| return 0; | |
| } else { /* write data port */ | |
| return i8253_unit[devnum].u3; | |
| } | |
| } | |
| return 0; | |
| } | |
| uint8 i8253t1(t_bool io, uint8 data) | |
| { | |
| uint8 devnum; | |
| if ((devnum = i8253_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read data port */ | |
| i8253_unit[devnum].u4 = data; | |
| return 0; | |
| } else { /* write data port */ | |
| return i8253_unit[devnum].u4; | |
| } | |
| } | |
| return 0; | |
| } | |
| uint8 i8253t2(t_bool io, uint8 data) | |
| { | |
| uint8 devnum; | |
| if ((devnum = i8253_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read data port */ | |
| i8253_unit[devnum].u5 = data; | |
| return 0; | |
| } else { /* write data port */ | |
| return i8253_unit[devnum].u5; | |
| } | |
| } | |
| return 0; | |
| } | |
| uint8 i8253c(t_bool io, uint8 data) | |
| { | |
| uint8 devnum; | |
| if ((devnum = i8253_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read status port */ | |
| i8253_unit[devnum].u6 = data; | |
| return 0; | |
| } else { /* write data port */ | |
| return i8253_unit[devnum].u6; | |
| } | |
| } | |
| return 0; | |
| } | |
| /* end of i8253.c */ |