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/* 16450.c -- Simulation of 8250/16450 serial UART
   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
 
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
/* This is functional simulation of 8250/16450 UARTs. Since we RX/TX data
   via file streams, we can't simulate modem control lines coming from the
   DCE and similar details of communication with the DCE.
 
   This simulated UART device is intended for basic UART device driver
   verification. From device driver perspective this device looks like a
   regular UART but never reports and modem control lines changes (the
   only DCE responses are incoming characters from the file stream).
*/
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
#include "abstract.h"
#include "16450.h"
#include "sim-config.h"
#include "pic.h"
 
static struct dev_16450 uarts[NR_UARTS];
static int thre_int;
 
/* Number of clock cycles (one clock cycle is one call to the uart_clock())
   before a single character is transmitted or received. */
static void set_char_clks(int uartchip)
{
        int bauds_per_char = 0;
 
        uarts[uartchip].char_clks = (uarts[uartchip].regs.dlh << 8)
                                        + uarts[uartchip].regs.dll;
 
        if (uarts[uartchip].regs.lcr & UART_LCR_PARITY)
                bauds_per_char++;
 
        if (uarts[uartchip].regs.lcr & UART_LCR_STOP)
                bauds_per_char += 2;
        else
                bauds_per_char++;
 
        bauds_per_char += (5 + (uarts[uartchip].regs.lcr & 0x2));
 
        uarts[uartchip].char_clks *= bauds_per_char;
}
 
/* Set a specific UART register with value. */
void uart_write_byte(unsigned long addr, unsigned long value)
{
        int chipsel;
 
        debug("uart_write_byte(%x,%02x)\n", addr, (unsigned)value);
 
        for(chipsel = 0; chipsel < NR_UARTS; chipsel++)
                if ((addr & ~(UART_ADDR_SPACE-1)) == uarts[chipsel].baseaddr)
                        break;
                else if (chipsel == NR_UARTS)
                        return;
 
        if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {
                switch (addr % UART_ADDR_SPACE) {
                        case UART_DLL:
                                uarts[chipsel].regs.dll = value;
                                break;
                        case UART_DLH:
                                uarts[chipsel].regs.dlh = value;
                                break;
                        case UART_LCR:
                                uarts[chipsel].regs.lcr = value & UART_VALID_LCR;
                                break;
                        default:
                                debug("write out of range (addr %x, DLAB=1)\n", addr);
                }
                set_char_clks(chipsel);
                return;
        }
 
        switch (addr % UART_ADDR_SPACE) {
                case UART_TXBUF:
                        uarts[chipsel].regs.txbuf = value;
                        uarts[chipsel].istat.txbuf = FULL;
                        uarts[chipsel].regs.lsr &= ~UART_LSR_TXBUFE;
                        uarts[chipsel].regs.lsr &= ~UART_LSR_TXSERE;
                        uarts[chipsel].istat.thre_int = 0;
                        break;
                case UART_IER:
                        uarts[chipsel].regs.ier = value & UART_VALID_IER;
                        break;
                case UART_LCR:
                        uarts[chipsel].regs.lcr = value & UART_VALID_LCR;
                        break;
                case UART_MCR:
                        uarts[chipsel].regs.mcr = value & UART_VALID_MCR;
                        break;
                case UART_SCR:
                        uarts[chipsel].regs.scr = value;
                        break;
                default:
                        debug("write out of range (addr %x)\n", addr);
        }
        set_char_clks(chipsel);
        return;
}
 
/* Read a specific UART register. */
unsigned long uart_read_byte(unsigned long addr)
{
        unsigned char value = 0;
        int chipsel;
 
        debug("uart_read_byte(%x)\n", addr);
 
        for(chipsel = 0; chipsel < NR_UARTS; chipsel++)
                if ((addr & ~(UART_ADDR_SPACE-1)) == uarts[chipsel].baseaddr)
                        break;
                else if (chipsel == NR_UARTS)
                        return 0;
 
        if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {
                switch (addr % UART_ADDR_SPACE) {
                        case UART_DLL:
                                value = uarts[chipsel].regs.dll;
                                break;
                        case UART_DLH:
                                value = uarts[chipsel].regs.dlh;
                                break;
                        default:
                                debug("read out of range (addr %x, DLAB=1)\n", addr);
                }
                return value;
        }
 
        switch (addr % UART_ADDR_SPACE) {
                case UART_RXBUF:
                        value = uarts[chipsel].regs.rxbuf;
                        uarts[chipsel].istat.rxbuf = EMPTY;
                        uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;
                        break;
                case UART_IER:
                        value = uarts[chipsel].regs.ier & UART_VALID_IER;
                        break;
                case UART_IIR:
                        value = uarts[chipsel].regs.iir & UART_VALID_IIR;
                        uarts[chipsel].istat.thre_int = 0;
                        break;
                case UART_LCR:
                        value = uarts[chipsel].regs.lcr & UART_VALID_LCR;
                        break;
                case UART_MCR:
                        value = uarts[chipsel].regs.mcr & UART_VALID_MCR;
                        break;
                case UART_LSR:
                        value = uarts[chipsel].regs.lsr & UART_VALID_LSR;
                        uarts[chipsel].regs.lsr &=
                                ~(UART_LSR_OVRRUN | UART_LSR_PARITY
                                 | UART_LSR_FRAME | UART_LSR_BREAK);
                        break;
                case UART_MSR:
                        value = uarts[chipsel].regs.msr & UART_VALID_MSR;
                        uarts[chipsel].regs.msr = 0;
                        break;
                case UART_SCR:
                        value = uarts[chipsel].regs.scr;
                        break;
                default:
                        debug("read out of range (addr %x)\n", addr);
        }
        return value;
}
 
/* Reset. It initializes all registers of all UART devices to zero values,
   (re)opens all RX/TX file streams and places devices in memory address
   space. */
void uart_reset()
{
        int i;
 
        printf("Resetting %u UART(s).\n", NR_UARTS);
        memset(uarts, 0, sizeof(uarts));
 
        for(i = 0; i < NR_UARTS; i++)
                if (config.uarts[i].txfile) { /* MM: Try to create stream.  */
                        if (!(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r"))
                                && !(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r+"))) {
                                printf("UART%d has problems with RX file stream.\n", i);
                                continue;
                        }
                        uarts[i].txfs = fopen(config.uarts[i].txfile, "a");
                        uarts[i].baseaddr = config.uarts[i].baseaddr;
                        if (uarts[i].txfs && uarts[i].txfs) {
                                printf("UART%d at 0x%.8x uses ", i, uarts[i].baseaddr);
                                printf("%s for RX and %s for TX.\n", config.uarts[i].rxfile, config.uarts[i].txfile);
                        } else
                                printf("UART%d has problems with TX file stream.\n", i);
                        register_memoryarea(uarts[i].baseaddr, UART_ADDR_SPACE, 1, uart_read_byte, uart_write_byte, 0);
                }
}
 
/* Simulation hook. Must be called every clock cycle to simulate all UART
   devices. It does internal functional UART simulation. */
void uart_clock()
{
        int i, retval;
 
        for(i = 0; i < NR_UARTS; i++) {
                if (!uarts[i].txfs) {
                        continue;
                }
 
                /* Transmit */
                if (uarts[i].istat.txser == EMPTY) {
                        uarts[i].regs.lsr |= UART_LSR_TXBUFE;
                        if (uarts[i].istat.txbuf == FULL) {
                                uarts[i].iregs.txser = uarts[i].regs.txbuf;
                                uarts[i].istat.txser = FULL;
                                uarts[i].istat.txbuf = EMPTY;
                                uarts[i].regs.lsr &= ~UART_LSR_TXSERE;
                                uarts[i].istat.thre_int = 1;
                        } else
                                uarts[i].regs.lsr |= UART_LSR_TXSERE;
                } else if (uarts[i].char_clks == uarts[i].istat.txser_clks++) {
                        debug("TX \'%c\' via UART%d...\n", uarts[i].iregs.txser, i);
                        if (uarts[i].regs.mcr & UART_MCR_LOOP)
                                uarts[i].iregs.loopback = uarts[i].iregs.txser;
                        else {
                                fputc((int)uarts[i].iregs.txser, uarts[i].txfs);
                                fflush(uarts[i].txfs);
                        }
                        uarts[i].istat.txser = EMPTY;
                        uarts[i].istat.txser_clks = 0;
                }
 
                /* Receive */
                if (uarts[i].istat.rxser == EMPTY)
                        uarts[i].istat.rxser = FULL;
                else if (uarts[i].char_clks == uarts[i].istat.rxser_clks++) {
                        debug("Receiving via UART%d...\n", i);
                        if (uarts[i].regs.mcr & UART_MCR_LOOP)
                                uarts[i].iregs.rxser = uarts[i].iregs.loopback;
                        else if((retval = fgetc(uarts[i].rxfs)) != EOF) {
                                uarts[i].iregs.rxser = (char)retval;
                                if (uarts[i].istat.rxbuf == FULL)
                                        uarts[i].regs.lsr |= UART_LSR_OVRRUN;
                                uarts[i].regs.lsr |= UART_LSR_RDRDY;
                                uarts[i].regs.rxbuf = uarts[i].iregs.rxser;
                                uarts[i].istat.rxbuf = FULL;
                        }
                        uarts[i].istat.rxser = EMPTY;
                        uarts[i].istat.rxser_clks = 0;
                }
 
                /* Loopback */
                if (uarts[i].regs.mcr & UART_MCR_LOOP) {
                        debug("uart_clock: Loopback\n");
                        if ((uarts[i].regs.mcr & UART_MCR_AUX2) !=
                            ((uarts[i].regs.msr & UART_MSR_DCD) >> 4))
                                uarts[i].regs.msr |= UART_MSR_DDCD;
                        if ((uarts[i].regs.mcr & UART_MCR_AUX1) <
                            ((uarts[i].regs.msr & UART_MSR_RI) >> 4))
                                uarts[i].regs.msr |= UART_MSR_TERI;
                        if ((uarts[i].regs.mcr & UART_MCR_RTS) !=
                            ((uarts[i].regs.msr & UART_MSR_CTS) >> 3))
                                uarts[i].regs.msr |= UART_MSR_DCTS;
                        if ((uarts[i].regs.mcr & UART_MCR_DTR) !=
                            ((uarts[i].regs.msr & UART_MSR_DSR) >> 5))
                                uarts[i].regs.msr |= UART_MSR_DDSR;
                        uarts[i].regs.msr &= ~(UART_MSR_DCD | UART_MSR_RI
                                              | UART_MSR_DSR | UART_MSR_CTS);
                        uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_AUX2) << 4);
                        uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_AUX1) << 4);
                        uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_RTS) << 3);
                        uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_DTR) << 5);
                }
 
                /* Interrupt detection in proper priority order. */
                uarts[i].regs.iir = UART_IIR_NO_INT;
                if (uarts[i].regs.ier & UART_IER_RLSI &&
                    uarts[i].regs.lsr & (UART_LSR_OVRRUN | UART_LSR_PARITY
                                        | UART_LSR_FRAME | UART_LSR_BREAK)) {
                        uarts[i].regs.iir = UART_IIR_RLSI;
                }
                else if (uarts[i].regs.ier & UART_IER_RDI &&
                    uarts[i].regs.lsr & UART_LSR_RDRDY) {
                        uarts[i].regs.iir = UART_IIR_RDI;
                }
                else if (uarts[i].regs.ier & UART_IER_THRI &&
                    uarts[i].regs.lsr & UART_LSR_TXBUFE &&
                    uarts[i].istat.thre_int == 1) {
                        uarts[i].regs.iir = UART_IIR_THRI;
                }
                else if (uarts[i].regs.ier & UART_IER_MSI &&
                    uarts[i].regs.msr & (UART_MSR_DCTS | UART_MSR_DDSR
                                        | UART_MSR_TERI | UART_MSR_DDCD)) {
                        uarts[i].regs.iir = UART_IIR_MSI;
                }
                if (!(uarts[i].regs.iir & UART_IIR_NO_INT))
                        report_interrupt(INT_UART);
        }
}
 
/* Print register values on stdout. */
void uart_status()
{
        int i;
 
        for(i = 0; i < NR_UARTS; i++) {
                if ( !uarts[i].baseaddr )
                        continue;
                printf("\nUART%d visible registers at 0x%.8x:\n", i, uarts[i].baseaddr);
                printf("RXBUF: %.2x  TXBUF: %.2x\n", uarts[i].regs.rxbuf, uarts[i].regs.txbuf);
                printf("DLL  : %.2x  DLH  : %.2x\n", uarts[i].regs.dll, uarts[i].regs.dlh);
                printf("IER  : %.2x  IIR  : %.2x\n", uarts[i].regs.ier, uarts[i].regs.iir);
                printf("LCR  : %.2x  MCR  : %.2x\n", uarts[i].regs.lcr, uarts[i].regs.mcr);
                printf("LSR  : %.2x  MSR  : %.2x\n", uarts[i].regs.lsr, uarts[i].regs.msr);
                printf("SCR  : %.2x\n", uarts[i].regs.scr);
 
                printf("\nInternal registers (sim debug):\n");
                printf("RXSER: %.2x  TXSER: %.2x\n", uarts[i].iregs.rxser, uarts[i].iregs.txser);
 
                printf("\nInternal status (sim debug):\n");
                printf("char_clks: %d\n", uarts[i].char_clks);
                printf("rxser_clks: %d  txser_clks: %d\n", uarts[i].istat.rxser_clks, uarts[i].istat.txser_clks);
                printf("rxser: %d  txser: %d\n", uarts[i].istat.rxser, uarts[i].istat.txser);
                printf("rxbuf: %d  txbuf: %d\n", uarts[i].istat.rxbuf, uarts[i].istat.txbuf);
 
                printf("RX fs: %p  TX fs: %p\n\n", uarts[i].rxfs, uarts[i].txfs);
        }
}

Line No.	Rev	Author	Line
1	31	lampret	`/* 16450.c -- Simulation of 8250/16450 serial UART`
2			`Copyright (C) 1999 Damjan Lampret, lampret@opencores.org`
3
4			`This file is part of OpenRISC 1000 Architectural Simulator.`
5
6			`This program is free software; you can redistribute it and/or modify`
7			`it under the terms of the GNU General Public License as published by`
8			`the Free Software Foundation; either version 2 of the License, or`
9			`(at your option) any later version.`
10
11			`This program is distributed in the hope that it will be useful,`
12			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
14			`GNU General Public License for more details.`
15
16			`You should have received a copy of the GNU General Public License`
17			`along with this program; if not, write to the Free Software`
18			`Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */`
19
20			`/* This is functional simulation of 8250/16450 UARTs. Since we RX/TX data`
21			`via file streams, we can't simulate modem control lines coming from the`
22			`DCE and similar details of communication with the DCE.`
23
24			`This simulated UART device is intended for basic UART device driver`
25			`verification. From device driver perspective this device looks like a`
26			`regular UART but never reports and modem control lines changes (the`
27			`only DCE responses are incoming characters from the file stream).`
28			`*/`
29
30			`#include <stdlib.h>`
31			`#include <stdio.h>`
32			`#include <string.h>`
33
34	235	erez	`#include "abstract.h"`
35	31	lampret	`#include "16450.h"`
36			`#include "sim-config.h"`
37	102	lampret	`#include "pic.h"`
38	31	lampret
39			`static struct dev_16450 uarts[NR_UARTS];`
40	221	markom	`static int thre_int;`
41	31	lampret
42			`/* Number of clock cycles (one clock cycle is one call to the uart_clock())`
43			`before a single character is transmitted or received. */`
44			`static void set_char_clks(int uartchip)`
45			`{`
46			`int bauds_per_char = 0;`
47
48			`uarts[uartchip].char_clks = (uarts[uartchip].regs.dlh << 8)`
49			`+ uarts[uartchip].regs.dll;`
50
51			`if (uarts[uartchip].regs.lcr & UART_LCR_PARITY)`
52			`bauds_per_char++;`
53
54			`if (uarts[uartchip].regs.lcr & UART_LCR_STOP)`
55			`bauds_per_char += 2;`
56			`else`
57			`bauds_per_char++;`
58
59			`bauds_per_char += (5 + (uarts[uartchip].regs.lcr & 0x2));`
60
61			`uarts[uartchip].char_clks *= bauds_per_char;`
62			`}`
63
64			`/* Set a specific UART register with value. */`
65	238	erez	`void uart_write_byte(unsigned long addr, unsigned long value)`
66	31	lampret	`{`
67			`int chipsel;`
68
69	238	erez	`debug("uart_write_byte(%x,%02x)\n", addr, (unsigned)value);`
70	221	markom
71	31	lampret	`for(chipsel = 0; chipsel < NR_UARTS; chipsel++)`
72			`if ((addr & ~(UART_ADDR_SPACE-1)) == uarts[chipsel].baseaddr)`
73			`break;`
74			`else if (chipsel == NR_UARTS)`
75			`return;`
76
77	221	markom	`if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {`
78			`switch (addr % UART_ADDR_SPACE) {`
79			`case UART_DLL:`
80	235	erez	`uarts[chipsel].regs.dll = value;`
81	221	markom	`break;`
82			`case UART_DLH:`
83	235	erez	`uarts[chipsel].regs.dlh = value;`
84	221	markom	`break;`
85			`case UART_LCR:`
86	235	erez	`uarts[chipsel].regs.lcr = value & UART_VALID_LCR;`
87	221	markom	`break;`
88			`default:`
89			`debug("write out of range (addr %x, DLAB=1)\n", addr);`
90			`}`
91	31	lampret	`set_char_clks(chipsel);`
92			`return;`
93	221	markom	`}`
94	31	lampret
95			`switch (addr % UART_ADDR_SPACE) {`
96			`case UART_TXBUF:`
97	235	erez	`uarts[chipsel].regs.txbuf = value;`
98	31	lampret	`uarts[chipsel].istat.txbuf = FULL;`
99			`uarts[chipsel].regs.lsr &= ~UART_LSR_TXBUFE;`
100			`uarts[chipsel].regs.lsr &= ~UART_LSR_TXSERE;`
101	221	markom	`uarts[chipsel].istat.thre_int = 0;`
102	31	lampret	`break;`
103			`case UART_IER:`
104	235	erez	`uarts[chipsel].regs.ier = value & UART_VALID_IER;`
105	31	lampret	`break;`
106			`case UART_LCR:`
107	235	erez	`uarts[chipsel].regs.lcr = value & UART_VALID_LCR;`
108	31	lampret	`break;`
109			`case UART_MCR:`
110	235	erez	`uarts[chipsel].regs.mcr = value & UART_VALID_MCR;`
111	31	lampret	`break;`
112			`case UART_SCR:`
113	235	erez	`uarts[chipsel].regs.scr = value;`
114	31	lampret	`break;`
115			`default:`
116			`debug("write out of range (addr %x)\n", addr);`
117			`}`
118			`set_char_clks(chipsel);`
119			`return;`
120			`}`
121
122			`/* Read a specific UART register. */`
123	238	erez	`unsigned long uart_read_byte(unsigned long addr)`
124	31	lampret	`{`
125			`unsigned char value = 0;`
126			`int chipsel;`
127
128	238	erez	`debug("uart_read_byte(%x)\n", addr);`
129	221	markom
130	31	lampret	`for(chipsel = 0; chipsel < NR_UARTS; chipsel++)`
131			`if ((addr & ~(UART_ADDR_SPACE-1)) == uarts[chipsel].baseaddr)`
132			`break;`
133			`else if (chipsel == NR_UARTS)`
134			`return 0;`
135
136	221	markom	`if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {`
137			`switch (addr % UART_ADDR_SPACE) {`
138			`case UART_DLL:`
139			`value = uarts[chipsel].regs.dll;`
140			`break;`
141			`case UART_DLH:`
142			`value = uarts[chipsel].regs.dlh;`
143			`break;`
144			`default:`
145			`debug("read out of range (addr %x, DLAB=1)\n", addr);`
146			`}`
147	235	erez	`return value;`
148	221	markom	`}`
149	31	lampret
150			`switch (addr % UART_ADDR_SPACE) {`
151			`case UART_RXBUF:`
152			`value = uarts[chipsel].regs.rxbuf;`
153			`uarts[chipsel].istat.rxbuf = EMPTY;`
154			`uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;`
155			`break;`
156			`case UART_IER:`
157			`value = uarts[chipsel].regs.ier & UART_VALID_IER;`
158			`break;`
159			`case UART_IIR:`
160			`value = uarts[chipsel].regs.iir & UART_VALID_IIR;`
161	221	markom	`uarts[chipsel].istat.thre_int = 0;`
162	31	lampret	`break;`
163			`case UART_LCR:`
164			`value = uarts[chipsel].regs.lcr & UART_VALID_LCR;`
165			`break;`
166			`case UART_MCR:`
167			`value = uarts[chipsel].regs.mcr & UART_VALID_MCR;`
168			`break;`
169			`case UART_LSR:`
170			`value = uarts[chipsel].regs.lsr & UART_VALID_LSR;`
171			`uarts[chipsel].regs.lsr &=`
172			`~(UART_LSR_OVRRUN \| UART_LSR_PARITY`
173			`\| UART_LSR_FRAME \| UART_LSR_BREAK);`
174			`break;`
175			`case UART_MSR:`
176			`value = uarts[chipsel].regs.msr & UART_VALID_MSR;`
177			`uarts[chipsel].regs.msr = 0;`
178			`break;`
179			`case UART_SCR:`
180			`value = uarts[chipsel].regs.scr;`
181			`break;`
182			`default:`
183			`debug("read out of range (addr %x)\n", addr);`
184			`}`
185	235	erez	`return value;`
186	31	lampret	`}`
187
188			`/* Reset. It initializes all registers of all UART devices to zero values,`
189			`(re)opens all RX/TX file streams and places devices in memory address`
190			`space. */`
191			`void uart_reset()`
192			`{`
193	235	erez	`int i;`
194	221	markom
195	235	erez	`printf("Resetting %u UART(s).\n", NR_UARTS);`
196			`memset(uarts, 0, sizeof(uarts));`
197	123	markom
198	235	erez	`for(i = 0; i < NR_UARTS; i++)`
199			`if (config.uarts[i].txfile) { /* MM: Try to create stream. */`
200			`if (!(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r"))`
201			`&& !(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r+"))) {`
202			`printf("UART%d has problems with RX file stream.\n", i);`
203			`continue;`
204			`}`
205			`uarts[i].txfs = fopen(config.uarts[i].txfile, "a");`
206			`uarts[i].baseaddr = config.uarts[i].baseaddr;`
207			`if (uarts[i].txfs && uarts[i].txfs) {`
208			`printf("UART%d at 0x%.8x uses ", i, uarts[i].baseaddr);`
209			`printf("%s for RX and %s for TX.\n", config.uarts[i].rxfile, config.uarts[i].txfile);`
210			`} else`
211			`printf("UART%d has problems with TX file stream.\n", i);`
212	238	erez	`register_memoryarea(uarts[i].baseaddr, UART_ADDR_SPACE, 1, uart_read_byte, uart_write_byte, 0);`
213	235	erez	`}`
214	31	lampret	`}`
215	123	markom
216	31	lampret	`/* Simulation hook. Must be called every clock cycle to simulate all UART`
217			`devices. It does internal functional UART simulation. */`
218			`void uart_clock()`
219			`{`
220	221	markom	`int i, retval;`
221	31	lampret
222			`for(i = 0; i < NR_UARTS; i++) {`
223	221	markom	`if (!uarts[i].txfs) {`
224			`continue;`
225			`}`
226	31	lampret
227	221	markom	`/* Transmit */`
228			`if (uarts[i].istat.txser == EMPTY) {`
229			`uarts[i].regs.lsr \|= UART_LSR_TXBUFE;`
230			`if (uarts[i].istat.txbuf == FULL) {`
231			`uarts[i].iregs.txser = uarts[i].regs.txbuf;`
232			`uarts[i].istat.txser = FULL;`
233			`uarts[i].istat.txbuf = EMPTY;`
234			`uarts[i].regs.lsr &= ~UART_LSR_TXSERE;`
235			`uarts[i].istat.thre_int = 1;`
236			`} else`
237			`uarts[i].regs.lsr \|= UART_LSR_TXSERE;`
238			`} else if (uarts[i].char_clks == uarts[i].istat.txser_clks++) {`
239			`debug("TX \'%c\' via UART%d...\n", uarts[i].iregs.txser, i);`
240			`if (uarts[i].regs.mcr & UART_MCR_LOOP)`
241			`uarts[i].iregs.loopback = uarts[i].iregs.txser;`
242			`else {`
243			`fputc((int)uarts[i].iregs.txser, uarts[i].txfs);`
244			`fflush(uarts[i].txfs);`
245			`}`
246			`uarts[i].istat.txser = EMPTY;`
247			`uarts[i].istat.txser_clks = 0;`
248			`}`
249	31	lampret
250	221	markom	`/* Receive */`
251			`if (uarts[i].istat.rxser == EMPTY)`
252			`uarts[i].istat.rxser = FULL;`
253			`else if (uarts[i].char_clks == uarts[i].istat.rxser_clks++) {`
254			`debug("Receiving via UART%d...\n", i);`
255			`if (uarts[i].regs.mcr & UART_MCR_LOOP)`
256			`uarts[i].iregs.rxser = uarts[i].iregs.loopback;`
257			`else if((retval = fgetc(uarts[i].rxfs)) != EOF) {`
258			`uarts[i].iregs.rxser = (char)retval;`
259			`if (uarts[i].istat.rxbuf == FULL)`
260			`uarts[i].regs.lsr \|= UART_LSR_OVRRUN;`
261			`uarts[i].regs.lsr \|= UART_LSR_RDRDY;`
262			`uarts[i].regs.rxbuf = uarts[i].iregs.rxser;`
263			`uarts[i].istat.rxbuf = FULL;`
264			`}`
265			`uarts[i].istat.rxser = EMPTY;`
266			`uarts[i].istat.rxser_clks = 0;`
267			`}`
268	31	lampret
269	221	markom	`/* Loopback */`
270			`if (uarts[i].regs.mcr & UART_MCR_LOOP) {`
271			`debug("uart_clock: Loopback\n");`
272			`if ((uarts[i].regs.mcr & UART_MCR_AUX2) !=`
273			`((uarts[i].regs.msr & UART_MSR_DCD) >> 4))`
274			`uarts[i].regs.msr \|= UART_MSR_DDCD;`
275			`if ((uarts[i].regs.mcr & UART_MCR_AUX1) <`
276			`((uarts[i].regs.msr & UART_MSR_RI) >> 4))`
277			`uarts[i].regs.msr \|= UART_MSR_TERI;`
278			`if ((uarts[i].regs.mcr & UART_MCR_RTS) !=`
279			`((uarts[i].regs.msr & UART_MSR_CTS) >> 3))`
280			`uarts[i].regs.msr \|= UART_MSR_DCTS;`
281			`if ((uarts[i].regs.mcr & UART_MCR_DTR) !=`
282			`((uarts[i].regs.msr & UART_MSR_DSR) >> 5))`
283			`uarts[i].regs.msr \|= UART_MSR_DDSR;`
284			`uarts[i].regs.msr &= ~(UART_MSR_DCD \| UART_MSR_RI`
285			`\| UART_MSR_DSR \| UART_MSR_CTS);`
286			`uarts[i].regs.msr \|= ((uarts[i].regs.mcr & UART_MCR_AUX2) << 4);`
287			`uarts[i].regs.msr \|= ((uarts[i].regs.mcr & UART_MCR_AUX1) << 4);`
288			`uarts[i].regs.msr \|= ((uarts[i].regs.mcr & UART_MCR_RTS) << 3);`
289			`uarts[i].regs.msr \|= ((uarts[i].regs.mcr & UART_MCR_DTR) << 5);`
290			`}`
291
292			`/* Interrupt detection in proper priority order. */`
293			`uarts[i].regs.iir = UART_IIR_NO_INT;`
294			`if (uarts[i].regs.ier & UART_IER_RLSI &&`
295			`uarts[i].regs.lsr & (UART_LSR_OVRRUN \| UART_LSR_PARITY`
296			`\| UART_LSR_FRAME \| UART_LSR_BREAK)) {`
297			`uarts[i].regs.iir = UART_IIR_RLSI;`
298			`}`
299			`else if (uarts[i].regs.ier & UART_IER_RDI &&`
300			`uarts[i].regs.lsr & UART_LSR_RDRDY) {`
301			`uarts[i].regs.iir = UART_IIR_RDI;`
302			`}`
303			`else if (uarts[i].regs.ier & UART_IER_THRI &&`
304			`uarts[i].regs.lsr & UART_LSR_TXBUFE &&`
305			`uarts[i].istat.thre_int == 1) {`
306			`uarts[i].regs.iir = UART_IIR_THRI;`
307			`}`
308			`else if (uarts[i].regs.ier & UART_IER_MSI &&`
309			`uarts[i].regs.msr & (UART_MSR_DCTS \| UART_MSR_DDSR`
310			`\| UART_MSR_TERI \| UART_MSR_DDCD)) {`
311			`uarts[i].regs.iir = UART_IIR_MSI;`
312			`}`
313			`if (!(uarts[i].regs.iir & UART_IIR_NO_INT))`
314			`report_interrupt(INT_UART);`
315	31	lampret	`}`
316			`}`
317
318			`/* Print register values on stdout. */`
319			`void uart_status()`
320			`{`
321	221	markom	`int i;`
322	31	lampret
323	221	markom	`for(i = 0; i < NR_UARTS; i++) {`
324	235	erez	`if ( !uarts[i].baseaddr )`
325	221	markom	`continue;`
326			`printf("\nUART%d visible registers at 0x%.8x:\n", i, uarts[i].baseaddr);`
327			`printf("RXBUF: %.2x TXBUF: %.2x\n", uarts[i].regs.rxbuf, uarts[i].regs.txbuf);`
328			`printf("DLL : %.2x DLH : %.2x\n", uarts[i].regs.dll, uarts[i].regs.dlh);`
329			`printf("IER : %.2x IIR : %.2x\n", uarts[i].regs.ier, uarts[i].regs.iir);`
330			`printf("LCR : %.2x MCR : %.2x\n", uarts[i].regs.lcr, uarts[i].regs.mcr);`
331			`printf("LSR : %.2x MSR : %.2x\n", uarts[i].regs.lsr, uarts[i].regs.msr);`
332			`printf("SCR : %.2x\n", uarts[i].regs.scr);`
333	31	lampret
334	221	markom	`printf("\nInternal registers (sim debug):\n");`
335			`printf("RXSER: %.2x TXSER: %.2x\n", uarts[i].iregs.rxser, uarts[i].iregs.txser);`
336	31	lampret
337	221	markom	`printf("\nInternal status (sim debug):\n");`
338			`printf("char_clks: %d\n", uarts[i].char_clks);`
339			`printf("rxser_clks: %d txser_clks: %d\n", uarts[i].istat.rxser_clks, uarts[i].istat.txser_clks);`
340			`printf("rxser: %d txser: %d\n", uarts[i].istat.rxser, uarts[i].istat.txser);`
341			`printf("rxbuf: %d txbuf: %d\n", uarts[i].istat.rxbuf, uarts[i].istat.txbuf);`
342	31	lampret
343	221	markom	`printf("RX fs: %p TX fs: %p\n\n", uarts[i].rxfs, uarts[i].txfs);`
344	31	lampret	`}`
345			`}`

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