git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2430 c046a42c-6fe2-441c-8c8c-71466251a162
448 lines
12 KiB
C
448 lines
12 KiB
C
/*
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* QEMU Parallel PORT emulation
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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* Copyright (c) 2007 Marko Kohtala
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h"
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//#define DEBUG_PARALLEL
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#ifdef DEBUG_PARALLEL
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#define pdebug(fmt, arg...) printf("pp: " fmt, ##arg)
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#else
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#define pdebug(fmt, arg...) ((void)0)
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#endif
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#define PARA_REG_DATA 0
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#define PARA_REG_STS 1
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#define PARA_REG_CTR 2
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#define PARA_REG_EPP_ADDR 3
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#define PARA_REG_EPP_DATA 4
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/*
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* These are the definitions for the Printer Status Register
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*/
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#define PARA_STS_BUSY 0x80 /* Busy complement */
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#define PARA_STS_ACK 0x40 /* Acknowledge */
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#define PARA_STS_PAPER 0x20 /* Out of paper */
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#define PARA_STS_ONLINE 0x10 /* Online */
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#define PARA_STS_ERROR 0x08 /* Error complement */
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#define PARA_STS_TMOUT 0x01 /* EPP timeout */
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/*
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* These are the definitions for the Printer Control Register
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*/
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#define PARA_CTR_DIR 0x20 /* Direction (1=read, 0=write) */
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#define PARA_CTR_INTEN 0x10 /* IRQ Enable */
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#define PARA_CTR_SELECT 0x08 /* Select In complement */
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#define PARA_CTR_INIT 0x04 /* Initialize Printer complement */
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#define PARA_CTR_AUTOLF 0x02 /* Auto linefeed complement */
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#define PARA_CTR_STROBE 0x01 /* Strobe complement */
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#define PARA_CTR_SIGNAL (PARA_CTR_SELECT|PARA_CTR_INIT|PARA_CTR_AUTOLF|PARA_CTR_STROBE)
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struct ParallelState {
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uint8_t dataw;
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uint8_t datar;
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uint8_t status;
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uint8_t control;
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int irq;
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int irq_pending;
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CharDriverState *chr;
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int hw_driver;
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int epp_timeout;
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uint32_t last_read_offset; /* For debugging */
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};
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static void parallel_update_irq(ParallelState *s)
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{
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if (s->irq_pending)
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pic_set_irq(s->irq, 1);
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else
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pic_set_irq(s->irq, 0);
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}
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static void
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parallel_ioport_write_sw(void *opaque, uint32_t addr, uint32_t val)
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{
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ParallelState *s = opaque;
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pdebug("write addr=0x%02x val=0x%02x\n", addr, val);
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addr &= 7;
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switch(addr) {
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case PARA_REG_DATA:
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s->dataw = val;
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parallel_update_irq(s);
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break;
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case PARA_REG_CTR:
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if ((val & PARA_CTR_INIT) == 0 ) {
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s->status = PARA_STS_BUSY;
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s->status |= PARA_STS_ACK;
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s->status |= PARA_STS_ONLINE;
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s->status |= PARA_STS_ERROR;
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}
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else if (val & PARA_CTR_SELECT) {
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if (val & PARA_CTR_STROBE) {
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s->status &= ~PARA_STS_BUSY;
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if ((s->control & PARA_CTR_STROBE) == 0)
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qemu_chr_write(s->chr, &s->dataw, 1);
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} else {
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if (s->control & PARA_CTR_INTEN) {
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s->irq_pending = 1;
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}
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}
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}
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parallel_update_irq(s);
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s->control = val;
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break;
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}
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}
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static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
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{
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ParallelState *s = opaque;
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uint8_t parm = val;
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/* Sometimes programs do several writes for timing purposes on old
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HW. Take care not to waste time on writes that do nothing. */
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s->last_read_offset = ~0U;
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addr &= 7;
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switch(addr) {
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case PARA_REG_DATA:
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if (s->dataw == val)
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return;
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pdebug("wd%02x\n", val);
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qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_DATA, &parm);
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s->dataw = val;
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break;
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case PARA_REG_STS:
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pdebug("ws%02x\n", val);
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if (val & PARA_STS_TMOUT)
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s->epp_timeout = 0;
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break;
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case PARA_REG_CTR:
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val |= 0xc0;
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if (s->control == val)
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return;
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pdebug("wc%02x\n", val);
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qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
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s->control = val;
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break;
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case PARA_REG_EPP_ADDR:
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
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/* Controls not correct for EPP address cycle, so do nothing */
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pdebug("wa%02x s\n", val);
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else {
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struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
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if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE_ADDR, &ioarg)) {
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s->epp_timeout = 1;
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pdebug("wa%02x t\n", val);
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}
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else
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pdebug("wa%02x\n", val);
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}
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break;
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case PARA_REG_EPP_DATA:
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
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/* Controls not correct for EPP data cycle, so do nothing */
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pdebug("we%02x s\n", val);
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else {
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struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
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if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg)) {
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s->epp_timeout = 1;
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pdebug("we%02x t\n", val);
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}
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else
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pdebug("we%02x\n", val);
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}
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break;
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}
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}
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static void
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parallel_ioport_eppdata_write_hw2(void *opaque, uint32_t addr, uint32_t val)
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{
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ParallelState *s = opaque;
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uint16_t eppdata = cpu_to_le16(val);
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int err;
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struct ParallelIOArg ioarg = {
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.buffer = &eppdata, .count = sizeof(eppdata)
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};
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
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/* Controls not correct for EPP data cycle, so do nothing */
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pdebug("we%04x s\n", val);
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return;
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}
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err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
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if (err) {
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s->epp_timeout = 1;
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pdebug("we%04x t\n", val);
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}
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else
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pdebug("we%04x\n", val);
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}
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static void
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parallel_ioport_eppdata_write_hw4(void *opaque, uint32_t addr, uint32_t val)
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{
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ParallelState *s = opaque;
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uint32_t eppdata = cpu_to_le32(val);
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int err;
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struct ParallelIOArg ioarg = {
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.buffer = &eppdata, .count = sizeof(eppdata)
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};
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
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/* Controls not correct for EPP data cycle, so do nothing */
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pdebug("we%08x s\n", val);
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return;
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}
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err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
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if (err) {
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s->epp_timeout = 1;
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pdebug("we%08x t\n", val);
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}
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else
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pdebug("we%08x\n", val);
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}
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static uint32_t parallel_ioport_read_sw(void *opaque, uint32_t addr)
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{
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ParallelState *s = opaque;
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uint32_t ret = 0xff;
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addr &= 7;
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switch(addr) {
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case PARA_REG_DATA:
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if (s->control & PARA_CTR_DIR)
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ret = s->datar;
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else
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ret = s->dataw;
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break;
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case PARA_REG_STS:
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ret = s->status;
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s->irq_pending = 0;
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if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
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/* XXX Fixme: wait 5 microseconds */
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if (s->status & PARA_STS_ACK)
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s->status &= ~PARA_STS_ACK;
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else {
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/* XXX Fixme: wait 5 microseconds */
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s->status |= PARA_STS_ACK;
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s->status |= PARA_STS_BUSY;
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}
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}
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parallel_update_irq(s);
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break;
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case PARA_REG_CTR:
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ret = s->control;
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break;
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}
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pdebug("read addr=0x%02x val=0x%02x\n", addr, ret);
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return ret;
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}
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static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
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{
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ParallelState *s = opaque;
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uint8_t ret = 0xff;
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addr &= 7;
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switch(addr) {
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case PARA_REG_DATA:
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qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_DATA, &ret);
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if (s->last_read_offset != addr || s->datar != ret)
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pdebug("rd%02x\n", ret);
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s->datar = ret;
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break;
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case PARA_REG_STS:
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qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_STATUS, &ret);
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ret &= ~PARA_STS_TMOUT;
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if (s->epp_timeout)
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ret |= PARA_STS_TMOUT;
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if (s->last_read_offset != addr || s->status != ret)
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pdebug("rs%02x\n", ret);
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s->status = ret;
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break;
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case PARA_REG_CTR:
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/* s->control has some bits fixed to 1. It is zero only when
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it has not been yet written to. */
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if (s->control == 0) {
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qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_CONTROL, &ret);
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if (s->last_read_offset != addr)
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pdebug("rc%02x\n", ret);
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s->control = ret;
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}
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else {
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ret = s->control;
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if (s->last_read_offset != addr)
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pdebug("rc%02x\n", ret);
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}
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break;
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case PARA_REG_EPP_ADDR:
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
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/* Controls not correct for EPP addr cycle, so do nothing */
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pdebug("ra%02x s\n", ret);
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else {
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struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
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if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ_ADDR, &ioarg)) {
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s->epp_timeout = 1;
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pdebug("ra%02x t\n", ret);
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}
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else
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pdebug("ra%02x\n", ret);
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}
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break;
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case PARA_REG_EPP_DATA:
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
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/* Controls not correct for EPP data cycle, so do nothing */
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pdebug("re%02x s\n", ret);
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else {
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struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
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if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg)) {
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s->epp_timeout = 1;
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pdebug("re%02x t\n", ret);
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}
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else
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pdebug("re%02x\n", ret);
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}
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break;
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}
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s->last_read_offset = addr;
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return ret;
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}
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static uint32_t
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parallel_ioport_eppdata_read_hw2(void *opaque, uint32_t addr)
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{
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ParallelState *s = opaque;
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uint32_t ret;
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uint16_t eppdata = ~0;
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int err;
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struct ParallelIOArg ioarg = {
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.buffer = &eppdata, .count = sizeof(eppdata)
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};
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
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/* Controls not correct for EPP data cycle, so do nothing */
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pdebug("re%04x s\n", eppdata);
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return eppdata;
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}
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err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
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ret = le16_to_cpu(eppdata);
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if (err) {
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s->epp_timeout = 1;
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pdebug("re%04x t\n", ret);
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}
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else
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pdebug("re%04x\n", ret);
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return ret;
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}
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static uint32_t
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parallel_ioport_eppdata_read_hw4(void *opaque, uint32_t addr)
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{
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ParallelState *s = opaque;
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uint32_t ret;
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uint32_t eppdata = ~0U;
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int err;
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struct ParallelIOArg ioarg = {
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.buffer = &eppdata, .count = sizeof(eppdata)
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};
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if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
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/* Controls not correct for EPP data cycle, so do nothing */
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pdebug("re%08x s\n", eppdata);
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return eppdata;
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}
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err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
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ret = le32_to_cpu(eppdata);
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if (err) {
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s->epp_timeout = 1;
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pdebug("re%08x t\n", ret);
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}
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else
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pdebug("re%08x\n", ret);
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return ret;
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}
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static void parallel_ioport_ecp_write(void *opaque, uint32_t addr, uint32_t val)
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{
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addr &= 7;
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pdebug("wecp%d=%02x\n", addr, val);
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}
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static uint32_t parallel_ioport_ecp_read(void *opaque, uint32_t addr)
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{
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uint8_t ret = 0xff;
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addr &= 7;
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pdebug("recp%d:%02x\n", addr, ret);
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return ret;
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}
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/* If fd is zero, it means that the parallel device uses the console */
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ParallelState *parallel_init(int base, int irq, CharDriverState *chr)
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{
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ParallelState *s;
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uint8_t dummy;
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s = qemu_mallocz(sizeof(ParallelState));
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if (!s)
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return NULL;
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s->datar = ~0;
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s->dataw = ~0;
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s->status = PARA_STS_BUSY;
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s->status |= PARA_STS_ACK;
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s->status |= PARA_STS_ONLINE;
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s->status |= PARA_STS_ERROR;
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s->control = PARA_CTR_SELECT;
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s->control |= PARA_CTR_INIT;
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s->irq = irq;
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s->irq_pending = 0;
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s->chr = chr;
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s->hw_driver = 0;
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s->epp_timeout = 0;
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s->last_read_offset = ~0U;
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if (qemu_chr_ioctl(chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
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s->hw_driver = 1;
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s->status = dummy;
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}
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if (s->hw_driver) {
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register_ioport_write(base, 8, 1, parallel_ioport_write_hw, s);
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register_ioport_read(base, 8, 1, parallel_ioport_read_hw, s);
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register_ioport_write(base+4, 1, 2, parallel_ioport_eppdata_write_hw2, s);
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register_ioport_read(base+4, 1, 2, parallel_ioport_eppdata_read_hw2, s);
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register_ioport_write(base+4, 1, 4, parallel_ioport_eppdata_write_hw4, s);
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register_ioport_read(base+4, 1, 4, parallel_ioport_eppdata_read_hw4, s);
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register_ioport_write(base+0x400, 8, 1, parallel_ioport_ecp_write, s);
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register_ioport_read(base+0x400, 8, 1, parallel_ioport_ecp_read, s);
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}
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else {
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register_ioport_write(base, 8, 1, parallel_ioport_write_sw, s);
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register_ioport_read(base, 8, 1, parallel_ioport_read_sw, s);
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}
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return s;
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}
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