| /* 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 baseport and size. |
| 24 Apr 15 -- Modified to use simh_debug |
| |
| NOTES: |
| |
| */ |
| |
| #include "system_defs.h" |
| |
| #define DEBUG 0 |
| |
| /* external globals */ |
| |
| extern uint16 port; //port called in dev_table[port] |
| |
| /* external function prototypes */ |
| |
| extern uint16 reg_dev(uint8 (*routine)(t_bool, uint8), uint16, uint8); |
| |
| /* globals */ |
| |
| int32 i8253_devnum = 0; //actual number of 8253 instances + 1 |
| uint16 i8253_port[4]; //baseport port registered to each instance |
| |
| /* function prototypes */ |
| |
| t_stat i8253_svc (UNIT *uptr); |
| t_stat i8253_reset (DEVICE *dptr, uint16 baseport); |
| 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 = { |
| "I8251", //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) |
| { |
| sim_activate (&i8253_unit[0], i8253_unit[0].wait); /* continue poll */ |
| return SCPE_OK; |
| } |
| |
| /* Reset routine */ |
| |
| t_stat i8253_reset (DEVICE *dptr, uint16 baseport) |
| { |
| if (i8253_devnum > I8253_NUM) { |
| sim_printf("i8253_reset: too many devices!\n"); |
| return SCPE_MEM; |
| } |
| sim_printf(" 8253-%d: Reset\n", i8253_devnum); |
| sim_printf(" 8253-%d: Registered at %04X\n", i8253_devnum, baseport); |
| i8253_port[i8253_devnum] = baseport; |
| reg_dev(i8253t0, baseport, i8253_devnum); |
| reg_dev(i8253t1, baseport + 1, i8253_devnum); |
| reg_dev(i8253t2, baseport + 2, i8253_devnum); |
| reg_dev(i8253c, baseport + 3, i8253_devnum); |
| 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_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 %04X 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 */ |
| return i8253_unit[devnum].u3; |
| } else { /* write data port */ |
| if (DEBUG) |
| sim_printf(" 8253-%d: Timer 0=%02X\n", devnum, data); |
| i8253_unit[devnum].u3 = data; |
| //sim_activate_after (&i8253_unit[devnum], ); |
| return 0; |
| } |
| } |
| return 0; |
| } |
| |
| //read routine: |
| //sim_activate_time(&i8253_unit[devnum])/sim_inst_per_second() |
| |
| uint8 i8253t1(t_bool io, uint8 data) |
| { |
| uint8 devnum; |
| |
| if ((devnum = i8253_get_dn()) != 0xFF) { |
| if (io == 0) { /* read data port */ |
| return i8253_unit[devnum].u4; |
| } else { /* write data port */ |
| if (DEBUG) |
| sim_printf(" 8253-%d: Timer 1=%02X\n", devnum, data); |
| i8253_unit[devnum].u4 = data; |
| return 0; |
| } |
| } |
| return 0; |
| } |
| |
| uint8 i8253t2(t_bool io, uint8 data) |
| { |
| uint8 devnum; |
| |
| if ((devnum = i8253_get_dn()) != 0xFF) { |
| if (io == 0) { /* read data port */ |
| return i8253_unit[devnum].u5; |
| } else { /* write data port */ |
| if (DEBUG) |
| sim_printf(" 8253-%d: Timer 2=%02X\n", devnum, data); |
| i8253_unit[devnum].u5 = data; |
| return 0; |
| } |
| } |
| return 0; |
| } |
| |
| uint8 i8253c(t_bool io, uint8 data) |
| { |
| uint8 devnum; |
| |
| if ((devnum = i8253_get_dn()) != 0xFF) { |
| if (io == 0) { /* read status port */ |
| return i8253_unit[devnum].u6; |
| } else { /* write data port */ |
| i8253_unit[devnum].u6 = data; |
| if (DEBUG) |
| sim_printf(" 8253-%d: Mode Instruction=%02X\n", devnum, data); |
| return 0; |
| } |
| } |
| return 0; |
| } |
| |
| /* end of i8253.c */ |