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/* |
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* Copyright (C) 2004-2005 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_zs.c,v 1.20 2005/02/07 05:51:54 debug Exp $ |
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* |
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* Zilog serial controller, used by (at least) the SGI emulation mode. |
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* |
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* TODO: Implement this correctly. The values in here are too |
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* hardcoded, and the controller should be able to handle 2 serial lines. |
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* |
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* Right now it only barely works with NetSBD/sgimips. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "console.h" |
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#include "cpu.h" |
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#include "devices.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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|
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|
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#define ZS_TICK_SHIFT 14 |
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|
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struct zs_data { |
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int irq_nr; |
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int console_handle; |
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int addrmult; |
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|
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int reg_select; |
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|
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int tx_done; |
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}; |
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|
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|
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/* From NetBSD: */ |
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#define ZSRR0_RX_READY 1 |
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#define ZSRR0_TX_READY 4 |
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|
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|
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/* |
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* dev_zs_tick(): |
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*/ |
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void dev_zs_tick(struct cpu *cpu, void *extra) |
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{ |
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struct zs_data *d = (struct zs_data *) extra; |
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|
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if (console_charavail(d->console_handle) || d->tx_done) |
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cpu_interrupt(cpu, d->irq_nr); |
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else |
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cpu_interrupt_ack(cpu, d->irq_nr); |
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} |
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|
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|
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/* |
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* dev_zs_access(): |
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*/ |
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int dev_zs_access(struct cpu *cpu, struct memory *mem, uint64_t relative_addr, |
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unsigned char *data, size_t len, int writeflag, void *extra) |
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{ |
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struct zs_data *d = extra; |
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uint64_t idata = 0, odata = 0; |
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int port_nr; |
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|
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idata = memory_readmax64(cpu, data, len); |
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relative_addr /= d->addrmult; |
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|
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port_nr = relative_addr / 8; |
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|
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/* TODO: The zs controller has 2 ports... */ |
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/* relative_addr &= 7; */ |
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|
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switch (relative_addr) { |
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case 3: |
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if (writeflag==MEM_READ) { |
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odata = ZSRR0_TX_READY; |
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if (console_charavail(d->console_handle)) |
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odata |= ZSRR0_RX_READY; |
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/* debug("[ zs: read from 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)odata); */ |
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} else { |
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/* Hm... TODO */ |
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if (d->reg_select == 0) { |
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d->reg_select = idata; |
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} else { |
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switch (d->reg_select) { |
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case 8: console_putchar(d->console_handle, |
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idata & 255); |
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break; |
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default: |
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debug("[ zs: write to (unimplemented)" |
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" register 0x%02x: 0x%08x ]\n", |
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d->reg_select, (int)idata); |
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} |
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d->reg_select = 0; |
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} |
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/* debug("[ zs: write to 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)idata); */ |
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} |
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break; |
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case 7: |
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if (writeflag==MEM_READ) { |
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if (console_charavail(d->console_handle)) |
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odata = console_readchar(d->console_handle); |
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else |
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odata = 0; |
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/* debug("[ zs: read from 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)odata); */ |
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} else { |
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/* debug("[ zs: write to 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)idata); */ |
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console_putchar(d->console_handle, idata & 255); |
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d->tx_done = 1; |
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} |
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break; |
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|
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/* hehe, perhaps 0xb and 0xf are the second channel :-) */ |
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|
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case 0xb: |
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if (writeflag==MEM_READ) { |
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odata = 0; |
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#if 0 |
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/* TODO: Weird. Linux needs 4 here, NetBSD wants 0. */ |
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odata = 4; |
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#endif |
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if (d->tx_done) |
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odata |= 2; |
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if (console_charavail(d->console_handle)) |
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odata |= 4; |
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d->tx_done = 0; |
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debug("[ zs: read from 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)odata); |
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} else { |
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debug("[ zs: write to 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)idata); |
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} |
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break; |
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|
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/* 0xf is used by Linux: */ |
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case 0xf: |
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if (writeflag==MEM_READ) { |
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if (console_charavail(d->console_handle)) |
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odata = console_readchar(d->console_handle); |
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else |
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odata = 0; |
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/* debug("[ zs: read from 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)odata); */ |
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} else { |
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/* debug("[ zs: write to 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)idata); */ |
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console_putchar(d->console_handle, idata & 255); |
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d->tx_done = 1; |
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} |
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break; |
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default: |
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if (writeflag==MEM_READ) { |
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debug("[ zs: read from 0x%08lx ]\n", |
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(long)relative_addr); |
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} else { |
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debug("[ zs: write to 0x%08lx: 0x%08x ]\n", |
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(long)relative_addr, (int)idata); |
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} |
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} |
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|
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if (writeflag == MEM_READ) |
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memory_writemax64(cpu, data, len, odata); |
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|
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dev_zs_tick(cpu, extra); |
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|
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return 1; |
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} |
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|
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|
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/* |
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* dev_zs_init(): |
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*/ |
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int dev_zs_init(struct machine *machine, struct memory *mem, |
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uint64_t baseaddr, int irq_nr, int addrmult, char *name) |
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{ |
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struct zs_data *d; |
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|
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d = malloc(sizeof(struct zs_data)); |
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if (d == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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memset(d, 0, sizeof(struct zs_data)); |
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d->irq_nr = irq_nr; |
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d->addrmult = addrmult; |
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d->console_handle = console_start_slave(machine, name); |
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|
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memory_device_register(mem, "zs", baseaddr, DEV_ZS_LENGTH * addrmult, |
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dev_zs_access, d, MEM_DEFAULT, NULL); |
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|
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machine_add_tickfunction(machine, dev_zs_tick, d, ZS_TICK_SHIFT); |
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|
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return d->console_handle; |
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} |
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