| /* pdp11_pclk.c: KW11P programmable clock simulator | |
| Copyright (c) 1993-2008, Robert M Supnik | |
| Written by John Dundas, used with his gracious permission | |
| 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 | |
| ROBERT M SUPNIK 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 Robert M Supnik shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from Robert M Supnik. | |
| pclk KW11P line frequency clock | |
| 20-May-08 RMS Standardized clock delay at 1mips | |
| 18-Jun-07 RMS Added UNIT_IDLE flag | |
| 07-Jul-05 RMS Removed extraneous externs | |
| KW11-P Programmable Clock | |
| I/O Page Registers: | |
| CSR 17 772 540 | |
| CSB 17 772 542 | |
| CNT 17 772 544 | |
| Vector: 0104 | |
| Priority: BR6 | |
| ** Theory of Operation ** | |
| A real KW11-P is built around the following major components: | |
| - 16-bit up/down counter | |
| - 16-bit count set buffer | |
| - 9-bit control and status register | |
| - clocks: crystal controlled (1) 100 kHz and (2) 10 kHz clocks, | |
| (3) a 50/60 Hz line frequency clock, and (4) an analog signal | |
| input trigger | |
| This software emulator for SIMH implements all of the above with | |
| the exception of the external input trigger, which is arbitrarily | |
| wired to 10Hz. | |
| Operation of this emulator is rather simplistic as compared to the | |
| actual device. The register read and write routines are responsible | |
| for copying internal state from the simulated device to the operating | |
| program. Clock state variables are altered in the write routine | |
| as well as the desired clock ticking rate. Possible rates are | |
| given in the table below. | |
| Rate Bit 2 Bit 1 | |
| 100 kHz 0 0 | |
| 10 kHz 0 1 | |
| Line frequency 1 0 | |
| External 1 1 | |
| I think SIMH would have a hard time actually keeping up with a 100 | |
| kHz ticking rate. I haven't tried this to verify, though. | |
| The clock service routine (pclk_svc) is responsible for ticking | |
| the clock. The routine does implement up/down, repeat vs. | |
| single-interrupt, and single clocking (maintenance). The routine | |
| updates the internal state according to the options selected and | |
| signals interrupts when appropriate. | |
| For a complete description of the device, please see DEC-11-HPWB-D | |
| KW11-P Programmable Real-Time Clock Manual. | |
| ** Notes ** | |
| 1. The device is disabled by default. | |
| 2. Use XXDP V2.5 test program ZKWBJ1.BIC; loads at 1000, starts at | |
| 1100? Seems to execute the first few tests correctly then waits | |
| for input from the console. I don't have a description of how this | |
| diagnostic works and thus don't know how to proceed from that point. | |
| 3. The read and write routines don't do anything with odd address | |
| accesses. The manual says that byte writes don't work. | |
| 4. RSTS can use this clock in place of the standard KW11-L line | |
| frequency clock. In order to do this, use the DEFAULT response in | |
| the OPTION: dialog. To the Preferred clock prompt answer "P". | |
| Then you have the option of line frequency "L" or some multiple of | |
| 50 between 50 and 1000 to use the programmable portion of the clock. | |
| 5. This is really a Unibus peripheral and thus doesn't actually make | |
| sense within a J-11 system as there never was a Qbus version of | |
| this to the best of my knowledge. However the OSs I have tried | |
| don't appear to exhibit any dissonance between this option and the | |
| processor/bus emulation. I think the options that would make | |
| somewhat more sense in a Qbus environment the KWV11-C and/or KWV11-S. | |
| I don't know if any of the -11 OSs contained support for using | |
| these as the system clock, though. | |
| */ | |
| #include "pdp11_defs.h" | |
| #define PCLKCSR_RDMASK 0100377 /* readable */ | |
| #define PCLKCSR_WRMASK 0000137 /* writeable */ | |
| #define UNIT_V_LINE50HZ (UNIT_V_UF + 0) | |
| #define UNIT_LINE50HZ (1 << UNIT_V_LINE50HZ) | |
| /* CSR - 17772540 */ | |
| #define CSR_V_FIX 5 /* single tick */ | |
| #define CSR_V_UPDN 4 /* down/up */ | |
| #define CSR_V_MODE 3 /* single/repeat */ | |
| #define CSR_FIX (1u << CSR_V_FIX) | |
| #define CSR_UPDN (1u << CSR_V_UPDN) | |
| #define CSR_MODE (1u << CSR_V_MODE) | |
| #define CSR_V_RATE 1 /* rate */ | |
| #define CSR_M_RATE 03 | |
| #define CSR_GETRATE(x) (((x) >> CSR_V_RATE) & CSR_M_RATE) | |
| extern int32 int_req[IPL_HLVL]; | |
| uint32 pclk_csr = 0; /* control/status */ | |
| uint32 pclk_csb = 0; /* count set buffer */ | |
| uint32 pclk_ctr = 0; /* counter */ | |
| static void pclk_set_ctr (uint32 val); | |
| static uint32 pclk_get_ctr (void); | |
| static uint32 rate[4] = { 100000, 10000, 60, 10 }; /* ticks per second */ | |
| static uint32 xtim[4] = { 10, 100, 16667, 100000 }; /* nominal usec delay per inc/dec */ | |
| t_stat pclk_rd (int32 *data, int32 PA, int32 access); | |
| t_stat pclk_wr (int32 data, int32 PA, int32 access); | |
| t_stat pclk_svc (UNIT *uptr); | |
| t_stat pclk_reset (DEVICE *dptr); | |
| t_stat pclk_set_line (UNIT *uptr, int32 val, CONST char *cptr, void *desc); | |
| t_stat pclk_show_freq (FILE *st, UNIT *uptr, int32 val, CONST void *desc); | |
| const char *pclk_description (DEVICE *dptr); | |
| /* PCLK data structures | |
| pclk_dev PCLK device descriptor | |
| pclk_unit PCLK unit descriptor | |
| pclk_reg PCLK register list | |
| */ | |
| #define IOLN_PCLK 006 | |
| DIB pclk_dib = { | |
| IOBA_AUTO, IOLN_PCLK, &pclk_rd, &pclk_wr, | |
| 1, IVCL (PCLK), VEC_AUTO, { NULL } | |
| }; | |
| UNIT pclk_unit = { UDATA (&pclk_svc, UNIT_IDLE, 0) }; | |
| REG pclk_reg[] = { | |
| { ORDATA (CSR, pclk_csr, 16) }, | |
| { ORDATA (CSB, pclk_csb, 16) }, | |
| { ORDATA (CNT, pclk_ctr, 16) }, | |
| { FLDATA (INT, IREQ (PCLK), INT_V_PCLK) }, | |
| { FLDATA (OVFL, pclk_csr, CSR_V_ERR) }, | |
| { FLDATA (DONE, pclk_csr, CSR_V_DONE) }, | |
| { FLDATA (IE, pclk_csr, CSR_V_IE) }, | |
| { FLDATA (UPDN, pclk_csr, CSR_V_UPDN) }, | |
| { FLDATA (MODE, pclk_csr, CSR_V_MODE) }, | |
| { FLDATA (RUN, pclk_csr, CSR_V_GO) }, | |
| { BRDATA (TIME, xtim, 10, 32, 4), REG_NZ + PV_LEFT }, | |
| { BRDATA (TPS, rate, 10, 32, 4), REG_NZ + PV_LEFT }, | |
| { ORDATA (DEVADDR, pclk_dib.ba, 32), REG_HRO }, | |
| { ORDATA (DEVVEC, pclk_dib.vec, 16), REG_HRO }, | |
| { NULL } | |
| }; | |
| MTAB pclk_mod[] = { | |
| { UNIT_LINE50HZ, UNIT_LINE50HZ, "50 Hz Line Frequency", "50HZ", &pclk_set_line }, | |
| { UNIT_LINE50HZ, 0, "60 Hz Line Frequency", "60HZ", &pclk_set_line }, | |
| { MTAB_XTD|MTAB_VDV, 0, "FREQUENCY", NULL, NULL, &pclk_show_freq, NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "ADDRESS", NULL, | |
| NULL, &show_addr, NULL }, | |
| { MTAB_XTD|MTAB_VDV, 0, "VECTOR", "VECTOR", | |
| &set_vec, &show_vec, NULL }, | |
| { 0 } | |
| }; | |
| DEVICE pclk_dev = { | |
| "PCLK", &pclk_unit, pclk_reg, pclk_mod, | |
| 1, 0, 0, 0, 0, 0, | |
| NULL, NULL, &pclk_reset, | |
| NULL, NULL, NULL, | |
| &pclk_dib, DEV_DISABLE | DEV_DIS | DEV_UBUS | DEV_QBUS, | |
| 0, NULL, NULL, NULL, NULL, | |
| NULL, NULL, &pclk_description, | |
| }; | |
| /* Clock I/O address routines */ | |
| t_stat pclk_rd (int32 *data, int32 PA, int32 access) | |
| { | |
| switch ((PA >> 1) & 03) { | |
| case 00: /* CSR */ | |
| *data = pclk_csr & PCLKCSR_RDMASK; /* return CSR */ | |
| pclk_csr = pclk_csr & ~(CSR_ERR | CSR_DONE); /* clr err, done */ | |
| CLR_INT (PCLK); /* clr intr */ | |
| break; | |
| case 01: /* buffer */ | |
| *data = 0; /* read only */ | |
| break; | |
| case 02: /* counter */ | |
| *data = pclk_get_ctr () & DMASK; /* return counter */ | |
| break; | |
| } | |
| return SCPE_OK; | |
| } | |
| t_stat pclk_wr (int32 data, int32 PA, int32 access) | |
| { | |
| int32 old_csr = pclk_csr; | |
| int32 rv; | |
| switch ((PA >> 1) & 03) { | |
| case 00: /* CSR */ | |
| pclk_csr = data & PCLKCSR_WRMASK; /* clear and write */ | |
| CLR_INT (PCLK); /* clr intr */ | |
| rv = CSR_GETRATE (pclk_csr); /* new rate */ | |
| if ((pclk_csr & CSR_GO) == 0) { /* stopped? */ | |
| pclk_ctr = pclk_get_ctr (); /* save current value */ | |
| sim_cancel (&pclk_unit); /* cancel */ | |
| if (data & CSR_FIX) { /* fix? tick */ | |
| pclk_ctr = DMASK & (pclk_ctr + (pclk_csr & CSR_UPDN)? 1 : -1); | |
| if (pclk_ctr == 0) | |
| pclk_svc (&pclk_unit); | |
| } | |
| } | |
| else if (((old_csr & CSR_GO) == 0) || /* run 0 -> 1? */ | |
| (rv != CSR_GETRATE (old_csr))) { /* rate change? */ | |
| sim_cancel (&pclk_unit); /* cancel */ | |
| pclk_set_ctr (pclk_csb); /* start clock */ | |
| } | |
| break; | |
| case 01: /* buffer */ | |
| pclk_csb = data; /* store ctr */ | |
| pclk_set_ctr (data); | |
| pclk_csr = pclk_csr & ~(CSR_ERR | CSR_DONE); /* clr err, done */ | |
| CLR_INT (PCLK); /* clr intr */ | |
| break; | |
| case 02: /* counter */ | |
| break; /* read only */ | |
| } | |
| return SCPE_OK; | |
| } | |
| static void pclk_set_ctr (uint32 val) | |
| { | |
| if ((pclk_csr & CSR_GO) == 0) /* stopped? */ | |
| pclk_ctr = val; /* save */ | |
| else { | |
| uint32 delay = DMASK & ((pclk_csr & CSR_UPDN) ? (DMASK + 1 - val) : val); | |
| int32 rv; | |
| rv = CSR_GETRATE (pclk_csr); /* get rate */ | |
| sim_activate_after (&pclk_unit, xtim[rv] * delay); /* schedule interrupt */ | |
| } | |
| } | |
| static uint32 pclk_get_ctr (void) | |
| { | |
| uint32 val; | |
| int32 rv; | |
| if (!sim_is_active (&pclk_unit)) | |
| return pclk_ctr; | |
| rv = CSR_GETRATE (pclk_csr); /* get rate */ | |
| val = (uint32)((sim_activate_time (&pclk_unit) / sim_timer_inst_per_sec ()) * (1000000 / xtim[rv])); | |
| val &= DMASK; | |
| if (pclk_csr & CSR_UPDN) | |
| val = DMASK + 1 - val; | |
| return val; | |
| } | |
| /* Clock tick (automatic or manual) */ | |
| /* Clock service */ | |
| t_stat pclk_svc (UNIT *uptr) | |
| { | |
| int32 rv; | |
| rv = CSR_GETRATE (pclk_csr); /* get rate */ | |
| if (pclk_csr & CSR_DONE) /* done already set? */ | |
| pclk_csr = pclk_csr | CSR_ERR; /* set error */ | |
| else | |
| pclk_csr = pclk_csr | CSR_DONE; /* else set done */ | |
| if (pclk_csr & CSR_IE) /* if IE, set int */ | |
| SET_INT (PCLK); | |
| if (pclk_csr & CSR_MODE) /* if rpt, reload */ | |
| pclk_set_ctr (pclk_csb); | |
| else { | |
| pclk_csb = 0; /* else clr ctr */ | |
| pclk_csr = pclk_csr & ~CSR_GO; /* and clr go */ | |
| } | |
| return SCPE_OK; | |
| } | |
| /* Clock reset */ | |
| t_stat pclk_reset (DEVICE *dptr) | |
| { | |
| pclk_csr = 0; /* clear reg */ | |
| pclk_csb = 0; | |
| pclk_ctr = 0; | |
| CLR_INT (PCLK); /* clear int */ | |
| sim_cancel (&pclk_unit); /* cancel */ | |
| return auto_config (0, 0); | |
| } | |
| /* Set line frequency */ | |
| t_stat pclk_set_line (UNIT *uptr, int32 val, CONST char *cptr, void *desc) | |
| { | |
| if (val == UNIT_LINE50HZ) { | |
| rate[2] = 50; | |
| xtim[2] = 20000; | |
| } | |
| else { | |
| rate[2] = 60; | |
| xtim[2] = 16667; | |
| } | |
| return SCPE_OK; | |
| } | |
| t_stat pclk_show_freq (FILE *st, UNIT *uptr, int32 val, CONST void *desc) | |
| { | |
| static const char *freqs[] = {"100K Hz", "10K Hz", "Line Freq", "External (10Hz)"}; | |
| fprintf (st, "%s", freqs[CSR_GETRATE (pclk_csr)]); | |
| return SCPE_OK; | |
| } | |
| const char *pclk_description (DEVICE *dptr) | |
| { | |
| return "KW11-P programmable real time clock"; | |
| } |