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/*
* Copyright (C) 2004 Anders Gavare. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* $Id: dev_zs.c,v 1.16 2005/01/09 01:55:25 debug Exp $
*
* Zilog serial controller, used by (at least) the SGI emulation mode.
*
* TODO: Implement this correctly. The values in here are too
* hardcoded, and the controller should be able to handle 2 serial lines.
*
* Right now it only barely works with NetSBD/sgimips.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "memory.h"
#include "misc.h"
#include "console.h"
#include "devices.h"
#define ZS_TICK_SHIFT 14
struct zs_data {
int irq_nr;
int addrmult;
int reg_select;
int tx_done;
};
/* From NetBSD: */
#define ZSRR0_RX_READY 1
#define ZSRR0_TX_READY 4
/*
* dev_zs_tick():
*/
void dev_zs_tick(struct cpu *cpu, void *extra)
{
struct zs_data *d = (struct zs_data *) extra;
if (console_charavail() || d->tx_done)
cpu_interrupt(cpu, d->irq_nr);
else
cpu_interrupt_ack(cpu, d->irq_nr);
}
/*
* dev_zs_access():
*/
int dev_zs_access(struct cpu *cpu, struct memory *mem, uint64_t relative_addr,
unsigned char *data, size_t len, int writeflag, void *extra)
{
struct zs_data *d = extra;
uint64_t idata = 0, odata = 0;
int port_nr;
idata = memory_readmax64(cpu, data, len);
relative_addr /= d->addrmult;
port_nr = relative_addr / 8;
/* TODO: The zs controller has 2 ports... */
/* relative_addr &= 7; */
switch (relative_addr) {
case 3:
if (writeflag==MEM_READ) {
odata = ZSRR0_TX_READY;
if (console_charavail())
odata |= ZSRR0_RX_READY;
/* debug("[ zs: read from 0x%08lx: 0x%08x ]\n", (long)relative_addr, odata); */
} else {
/* Hm... TODO */
if (d->reg_select == 0) {
d->reg_select = idata;
} else {
switch (d->reg_select) {
case 8: console_putchar(idata & 255);
break;
default:
debug("[ zs: write to (unimplemented) register 0x%02x: 0x%08x ]\n", d->reg_select, idata);
}
d->reg_select = 0;
}
/* debug("[ zs: write to 0x%08lx: 0x%08x ]\n", (long)relative_addr, idata); */
}
break;
case 7:
if (writeflag==MEM_READ) {
if (console_charavail())
odata = console_readchar();
else
odata = 0;
/* debug("[ zs: read from 0x%08lx: 0x%08x ]\n", (long)relative_addr, odata); */
} else {
/* debug("[ zs: write to 0x%08lx: 0x%08x ]\n", (long)relative_addr, idata); */
console_putchar(idata & 255);
d->tx_done = 1;
}
break;
/* hehe, perhaps 0xb and 0xf are the second channel :-) */
case 0xb:
if (writeflag==MEM_READ) {
odata = 0;
#if 0
/* TODO: Weird. Linux needs 4 here, NetBSD wants 0. */
odata = 4;
#endif
if (d->tx_done)
odata |= 2;
if (console_charavail())
odata |= 4;
d->tx_done = 0;
debug("[ zs: read from 0x%08lx: 0x%08x ]\n", (long)relative_addr, odata);
} else {
debug("[ zs: write to 0x%08lx: 0x%08x ]\n", (long)relative_addr, idata);
}
break;
/* 0xf is used by Linux: */
case 0xf:
if (writeflag==MEM_READ) {
if (console_charavail())
odata = console_readchar();
else
odata = 0;
/* debug("[ zs: read from 0x%08lx: 0x%08x ]\n", (long)relative_addr, odata); */
} else {
/* debug("[ zs: write to 0x%08lx: 0x%08x ]\n", (long)relative_addr, idata); */
console_putchar(idata & 255);
d->tx_done = 1;
}
break;
default:
if (writeflag==MEM_READ) {
debug("[ zs: read from 0x%08lx ]\n", (long)relative_addr);
} else {
debug("[ zs: write to 0x%08lx: 0x%08x ]\n", (long)relative_addr, idata);
}
}
if (writeflag == MEM_READ)
memory_writemax64(cpu, data, len, odata);
dev_zs_tick(cpu, extra);
return 1;
}
/*
* dev_zs_init():
*/
void dev_zs_init(struct cpu *cpu, struct memory *mem, uint64_t baseaddr,
int irq_nr, int addrmult)
{
struct zs_data *d;
d = malloc(sizeof(struct zs_data));
if (d == NULL) {
fprintf(stderr, "out of memory\n");
exit(1);
}
memset(d, 0, sizeof(struct zs_data));
d->irq_nr = irq_nr;
d->addrmult = addrmult;
memory_device_register(mem, "zs", baseaddr, DEV_ZS_LENGTH * addrmult,
dev_zs_access, d, MEM_DEFAULT, NULL);
cpu_add_tickfunction(cpu, dev_zs_tick, d, ZS_TICK_SHIFT);
}
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