2 * QEMU Parallel PORT emulation
4 * Copyright (c) 2003-2005 Fabrice Bellard
5 * Copyright (c) 2007 Marko Kohtala
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include "qemu-char.h"
30 //#define DEBUG_PARALLEL
33 #define pdebug(fmt, arg...) printf("pp: " fmt, ##arg)
35 #define pdebug(fmt, arg...) ((void)0)
38 #define PARA_REG_DATA 0
39 #define PARA_REG_STS 1
40 #define PARA_REG_CTR 2
41 #define PARA_REG_EPP_ADDR 3
42 #define PARA_REG_EPP_DATA 4
45 * These are the definitions for the Printer Status Register
47 #define PARA_STS_BUSY 0x80 /* Busy complement */
48 #define PARA_STS_ACK 0x40 /* Acknowledge */
49 #define PARA_STS_PAPER 0x20 /* Out of paper */
50 #define PARA_STS_ONLINE 0x10 /* Online */
51 #define PARA_STS_ERROR 0x08 /* Error complement */
52 #define PARA_STS_TMOUT 0x01 /* EPP timeout */
55 * These are the definitions for the Printer Control Register
57 #define PARA_CTR_DIR 0x20 /* Direction (1=read, 0=write) */
58 #define PARA_CTR_INTEN 0x10 /* IRQ Enable */
59 #define PARA_CTR_SELECT 0x08 /* Select In complement */
60 #define PARA_CTR_INIT 0x04 /* Initialize Printer complement */
61 #define PARA_CTR_AUTOLF 0x02 /* Auto linefeed complement */
62 #define PARA_CTR_STROBE 0x01 /* Strobe complement */
64 #define PARA_CTR_SIGNAL (PARA_CTR_SELECT|PARA_CTR_INIT|PARA_CTR_AUTOLF|PARA_CTR_STROBE)
66 struct ParallelState {
76 uint32_t last_read_offset; /* For debugging */
77 /* Memory-mapped interface */
78 target_phys_addr_t base;
82 static void parallel_update_irq(ParallelState *s)
85 qemu_irq_raise(s->irq);
87 qemu_irq_lower(s->irq);
91 parallel_ioport_write_sw(void *opaque, uint32_t addr, uint32_t val)
93 ParallelState *s = opaque;
95 pdebug("write addr=0x%02x val=0x%02x\n", addr, val);
101 parallel_update_irq(s);
104 if ((val & PARA_CTR_INIT) == 0 ) {
105 s->status = PARA_STS_BUSY;
106 s->status |= PARA_STS_ACK;
107 s->status |= PARA_STS_ONLINE;
108 s->status |= PARA_STS_ERROR;
110 else if (val & PARA_CTR_SELECT) {
111 if (val & PARA_CTR_STROBE) {
112 s->status &= ~PARA_STS_BUSY;
113 if ((s->control & PARA_CTR_STROBE) == 0)
114 qemu_chr_write(s->chr, &s->dataw, 1);
116 if (s->control & PARA_CTR_INTEN) {
121 parallel_update_irq(s);
127 static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
129 ParallelState *s = opaque;
132 /* Sometimes programs do several writes for timing purposes on old
133 HW. Take care not to waste time on writes that do nothing. */
135 s->last_read_offset = ~0U;
142 pdebug("wd%02x\n", val);
143 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_DATA, &parm);
147 pdebug("ws%02x\n", val);
148 if (val & PARA_STS_TMOUT)
153 if (s->control == val)
155 pdebug("wc%02x\n", val);
156 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
159 case PARA_REG_EPP_ADDR:
160 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
161 /* Controls not correct for EPP address cycle, so do nothing */
162 pdebug("wa%02x s\n", val);
164 struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
165 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE_ADDR, &ioarg)) {
167 pdebug("wa%02x t\n", val);
170 pdebug("wa%02x\n", val);
173 case PARA_REG_EPP_DATA:
174 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
175 /* Controls not correct for EPP data cycle, so do nothing */
176 pdebug("we%02x s\n", val);
178 struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
179 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg)) {
181 pdebug("we%02x t\n", val);
184 pdebug("we%02x\n", val);
191 parallel_ioport_eppdata_write_hw2(void *opaque, uint32_t addr, uint32_t val)
193 ParallelState *s = opaque;
194 uint16_t eppdata = cpu_to_le16(val);
196 struct ParallelIOArg ioarg = {
197 .buffer = &eppdata, .count = sizeof(eppdata)
199 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
200 /* Controls not correct for EPP data cycle, so do nothing */
201 pdebug("we%04x s\n", val);
204 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
207 pdebug("we%04x t\n", val);
210 pdebug("we%04x\n", val);
214 parallel_ioport_eppdata_write_hw4(void *opaque, uint32_t addr, uint32_t val)
216 ParallelState *s = opaque;
217 uint32_t eppdata = cpu_to_le32(val);
219 struct ParallelIOArg ioarg = {
220 .buffer = &eppdata, .count = sizeof(eppdata)
222 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
223 /* Controls not correct for EPP data cycle, so do nothing */
224 pdebug("we%08x s\n", val);
227 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
230 pdebug("we%08x t\n", val);
233 pdebug("we%08x\n", val);
236 static uint32_t parallel_ioport_read_sw(void *opaque, uint32_t addr)
238 ParallelState *s = opaque;
244 if (s->control & PARA_CTR_DIR)
252 if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
253 /* XXX Fixme: wait 5 microseconds */
254 if (s->status & PARA_STS_ACK)
255 s->status &= ~PARA_STS_ACK;
257 /* XXX Fixme: wait 5 microseconds */
258 s->status |= PARA_STS_ACK;
259 s->status |= PARA_STS_BUSY;
262 parallel_update_irq(s);
268 pdebug("read addr=0x%02x val=0x%02x\n", addr, ret);
272 static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
274 ParallelState *s = opaque;
279 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_DATA, &ret);
280 if (s->last_read_offset != addr || s->datar != ret)
281 pdebug("rd%02x\n", ret);
285 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_STATUS, &ret);
286 ret &= ~PARA_STS_TMOUT;
288 ret |= PARA_STS_TMOUT;
289 if (s->last_read_offset != addr || s->status != ret)
290 pdebug("rs%02x\n", ret);
294 /* s->control has some bits fixed to 1. It is zero only when
295 it has not been yet written to. */
296 if (s->control == 0) {
297 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_CONTROL, &ret);
298 if (s->last_read_offset != addr)
299 pdebug("rc%02x\n", ret);
304 if (s->last_read_offset != addr)
305 pdebug("rc%02x\n", ret);
308 case PARA_REG_EPP_ADDR:
309 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
310 /* Controls not correct for EPP addr cycle, so do nothing */
311 pdebug("ra%02x s\n", ret);
313 struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
314 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ_ADDR, &ioarg)) {
316 pdebug("ra%02x t\n", ret);
319 pdebug("ra%02x\n", ret);
322 case PARA_REG_EPP_DATA:
323 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
324 /* Controls not correct for EPP data cycle, so do nothing */
325 pdebug("re%02x s\n", ret);
327 struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
328 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg)) {
330 pdebug("re%02x t\n", ret);
333 pdebug("re%02x\n", ret);
337 s->last_read_offset = addr;
342 parallel_ioport_eppdata_read_hw2(void *opaque, uint32_t addr)
344 ParallelState *s = opaque;
346 uint16_t eppdata = ~0;
348 struct ParallelIOArg ioarg = {
349 .buffer = &eppdata, .count = sizeof(eppdata)
351 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
352 /* Controls not correct for EPP data cycle, so do nothing */
353 pdebug("re%04x s\n", eppdata);
356 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
357 ret = le16_to_cpu(eppdata);
361 pdebug("re%04x t\n", ret);
364 pdebug("re%04x\n", ret);
369 parallel_ioport_eppdata_read_hw4(void *opaque, uint32_t addr)
371 ParallelState *s = opaque;
373 uint32_t eppdata = ~0U;
375 struct ParallelIOArg ioarg = {
376 .buffer = &eppdata, .count = sizeof(eppdata)
378 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
379 /* Controls not correct for EPP data cycle, so do nothing */
380 pdebug("re%08x s\n", eppdata);
383 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
384 ret = le32_to_cpu(eppdata);
388 pdebug("re%08x t\n", ret);
391 pdebug("re%08x\n", ret);
395 static void parallel_ioport_ecp_write(void *opaque, uint32_t addr, uint32_t val)
398 pdebug("wecp%d=%02x\n", addr, val);
401 static uint32_t parallel_ioport_ecp_read(void *opaque, uint32_t addr)
405 pdebug("recp%d:%02x\n", addr, ret);
409 static void parallel_reset(ParallelState *s, qemu_irq irq, CharDriverState *chr)
413 s->status = PARA_STS_BUSY;
414 s->status |= PARA_STS_ACK;
415 s->status |= PARA_STS_ONLINE;
416 s->status |= PARA_STS_ERROR;
417 s->control = PARA_CTR_SELECT;
418 s->control |= PARA_CTR_INIT;
424 s->last_read_offset = ~0U;
427 /* If fd is zero, it means that the parallel device uses the console */
428 ParallelState *parallel_init(int base, qemu_irq irq, CharDriverState *chr)
433 s = qemu_mallocz(sizeof(ParallelState));
436 parallel_reset(s, irq, chr);
438 if (qemu_chr_ioctl(chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
444 register_ioport_write(base, 8, 1, parallel_ioport_write_hw, s);
445 register_ioport_read(base, 8, 1, parallel_ioport_read_hw, s);
446 register_ioport_write(base+4, 1, 2, parallel_ioport_eppdata_write_hw2, s);
447 register_ioport_read(base+4, 1, 2, parallel_ioport_eppdata_read_hw2, s);
448 register_ioport_write(base+4, 1, 4, parallel_ioport_eppdata_write_hw4, s);
449 register_ioport_read(base+4, 1, 4, parallel_ioport_eppdata_read_hw4, s);
450 register_ioport_write(base+0x400, 8, 1, parallel_ioport_ecp_write, s);
451 register_ioport_read(base+0x400, 8, 1, parallel_ioport_ecp_read, s);
454 register_ioport_write(base, 8, 1, parallel_ioport_write_sw, s);
455 register_ioport_read(base, 8, 1, parallel_ioport_read_sw, s);
460 /* Memory mapped interface */
461 static uint32_t parallel_mm_readb (void *opaque, target_phys_addr_t addr)
463 ParallelState *s = opaque;
465 return parallel_ioport_read_sw(s, (addr - s->base) >> s->it_shift) & 0xFF;
468 static void parallel_mm_writeb (void *opaque,
469 target_phys_addr_t addr, uint32_t value)
471 ParallelState *s = opaque;
473 parallel_ioport_write_sw(s, (addr - s->base) >> s->it_shift, value & 0xFF);
476 static uint32_t parallel_mm_readw (void *opaque, target_phys_addr_t addr)
478 ParallelState *s = opaque;
480 return parallel_ioport_read_sw(s, (addr - s->base) >> s->it_shift) & 0xFFFF;
483 static void parallel_mm_writew (void *opaque,
484 target_phys_addr_t addr, uint32_t value)
486 ParallelState *s = opaque;
488 parallel_ioport_write_sw(s, (addr - s->base) >> s->it_shift, value & 0xFFFF);
491 static uint32_t parallel_mm_readl (void *opaque, target_phys_addr_t addr)
493 ParallelState *s = opaque;
495 return parallel_ioport_read_sw(s, (addr - s->base) >> s->it_shift);
498 static void parallel_mm_writel (void *opaque,
499 target_phys_addr_t addr, uint32_t value)
501 ParallelState *s = opaque;
503 parallel_ioport_write_sw(s, (addr - s->base) >> s->it_shift, value);
506 static CPUReadMemoryFunc *parallel_mm_read_sw[] = {
512 static CPUWriteMemoryFunc *parallel_mm_write_sw[] = {
518 /* If fd is zero, it means that the parallel device uses the console */
519 ParallelState *parallel_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq, CharDriverState *chr)
524 s = qemu_mallocz(sizeof(ParallelState));
527 parallel_reset(s, irq, chr);
529 s->it_shift = it_shift;
531 io_sw = cpu_register_io_memory(0, parallel_mm_read_sw, parallel_mm_write_sw, s);
532 cpu_register_physical_memory(base, 8 << it_shift, io_sw);