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);
105 if ((val & PARA_CTR_INIT) == 0 ) {
106 s->status = PARA_STS_BUSY;
107 s->status |= PARA_STS_ACK;
108 s->status |= PARA_STS_ONLINE;
109 s->status |= PARA_STS_ERROR;
111 else if (val & PARA_CTR_SELECT) {
112 if (val & PARA_CTR_STROBE) {
113 s->status &= ~PARA_STS_BUSY;
114 if ((s->control & PARA_CTR_STROBE) == 0)
115 qemu_chr_write(s->chr, &s->dataw, 1);
117 if (s->control & PARA_CTR_INTEN) {
122 parallel_update_irq(s);
128 static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
130 ParallelState *s = opaque;
134 /* Sometimes programs do several writes for timing purposes on old
135 HW. Take care not to waste time on writes that do nothing. */
137 s->last_read_offset = ~0U;
144 pdebug("wd%02x\n", val);
145 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_DATA, &parm);
149 pdebug("ws%02x\n", val);
150 if (val & PARA_STS_TMOUT)
155 if (s->control == val)
157 pdebug("wc%02x\n", val);
159 if ((val & PARA_CTR_DIR) != (s->control & PARA_CTR_DIR)) {
160 if (val & PARA_CTR_DIR) {
165 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_DATA_DIR, &dir);
166 parm &= ~PARA_CTR_DIR;
169 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
172 case PARA_REG_EPP_ADDR:
173 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
174 /* Controls not correct for EPP address cycle, so do nothing */
175 pdebug("wa%02x s\n", val);
177 struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
178 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE_ADDR, &ioarg)) {
180 pdebug("wa%02x t\n", val);
183 pdebug("wa%02x\n", val);
186 case PARA_REG_EPP_DATA:
187 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
188 /* Controls not correct for EPP data cycle, so do nothing */
189 pdebug("we%02x s\n", val);
191 struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
192 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg)) {
194 pdebug("we%02x t\n", val);
197 pdebug("we%02x\n", val);
204 parallel_ioport_eppdata_write_hw2(void *opaque, uint32_t addr, uint32_t val)
206 ParallelState *s = opaque;
207 uint16_t eppdata = cpu_to_le16(val);
209 struct ParallelIOArg ioarg = {
210 .buffer = &eppdata, .count = sizeof(eppdata)
212 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
213 /* Controls not correct for EPP data cycle, so do nothing */
214 pdebug("we%04x s\n", val);
217 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
220 pdebug("we%04x t\n", val);
223 pdebug("we%04x\n", val);
227 parallel_ioport_eppdata_write_hw4(void *opaque, uint32_t addr, uint32_t val)
229 ParallelState *s = opaque;
230 uint32_t eppdata = cpu_to_le32(val);
232 struct ParallelIOArg ioarg = {
233 .buffer = &eppdata, .count = sizeof(eppdata)
235 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
236 /* Controls not correct for EPP data cycle, so do nothing */
237 pdebug("we%08x s\n", val);
240 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
243 pdebug("we%08x t\n", val);
246 pdebug("we%08x\n", val);
249 static uint32_t parallel_ioport_read_sw(void *opaque, uint32_t addr)
251 ParallelState *s = opaque;
257 if (s->control & PARA_CTR_DIR)
265 if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
266 /* XXX Fixme: wait 5 microseconds */
267 if (s->status & PARA_STS_ACK)
268 s->status &= ~PARA_STS_ACK;
270 /* XXX Fixme: wait 5 microseconds */
271 s->status |= PARA_STS_ACK;
272 s->status |= PARA_STS_BUSY;
275 parallel_update_irq(s);
281 pdebug("read addr=0x%02x val=0x%02x\n", addr, ret);
285 static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
287 ParallelState *s = opaque;
292 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_DATA, &ret);
293 if (s->last_read_offset != addr || s->datar != ret)
294 pdebug("rd%02x\n", ret);
298 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_STATUS, &ret);
299 ret &= ~PARA_STS_TMOUT;
301 ret |= PARA_STS_TMOUT;
302 if (s->last_read_offset != addr || s->status != ret)
303 pdebug("rs%02x\n", ret);
307 /* s->control has some bits fixed to 1. It is zero only when
308 it has not been yet written to. */
309 if (s->control == 0) {
310 qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_CONTROL, &ret);
311 if (s->last_read_offset != addr)
312 pdebug("rc%02x\n", ret);
317 if (s->last_read_offset != addr)
318 pdebug("rc%02x\n", ret);
321 case PARA_REG_EPP_ADDR:
322 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
323 /* Controls not correct for EPP addr cycle, so do nothing */
324 pdebug("ra%02x s\n", ret);
326 struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
327 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ_ADDR, &ioarg)) {
329 pdebug("ra%02x t\n", ret);
332 pdebug("ra%02x\n", ret);
335 case PARA_REG_EPP_DATA:
336 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
337 /* Controls not correct for EPP data cycle, so do nothing */
338 pdebug("re%02x s\n", ret);
340 struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
341 if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg)) {
343 pdebug("re%02x t\n", ret);
346 pdebug("re%02x\n", ret);
350 s->last_read_offset = addr;
355 parallel_ioport_eppdata_read_hw2(void *opaque, uint32_t addr)
357 ParallelState *s = opaque;
359 uint16_t eppdata = ~0;
361 struct ParallelIOArg ioarg = {
362 .buffer = &eppdata, .count = sizeof(eppdata)
364 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
365 /* Controls not correct for EPP data cycle, so do nothing */
366 pdebug("re%04x s\n", eppdata);
369 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
370 ret = le16_to_cpu(eppdata);
374 pdebug("re%04x t\n", ret);
377 pdebug("re%04x\n", ret);
382 parallel_ioport_eppdata_read_hw4(void *opaque, uint32_t addr)
384 ParallelState *s = opaque;
386 uint32_t eppdata = ~0U;
388 struct ParallelIOArg ioarg = {
389 .buffer = &eppdata, .count = sizeof(eppdata)
391 if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
392 /* Controls not correct for EPP data cycle, so do nothing */
393 pdebug("re%08x s\n", eppdata);
396 err = qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
397 ret = le32_to_cpu(eppdata);
401 pdebug("re%08x t\n", ret);
404 pdebug("re%08x\n", ret);
408 static void parallel_ioport_ecp_write(void *opaque, uint32_t addr, uint32_t val)
411 pdebug("wecp%d=%02x\n", addr, val);
414 static uint32_t parallel_ioport_ecp_read(void *opaque, uint32_t addr)
418 pdebug("recp%d:%02x\n", addr, ret);
422 static void parallel_reset(ParallelState *s, qemu_irq irq, CharDriverState *chr)
426 s->status = PARA_STS_BUSY;
427 s->status |= PARA_STS_ACK;
428 s->status |= PARA_STS_ONLINE;
429 s->status |= PARA_STS_ERROR;
430 s->status |= PARA_STS_TMOUT;
431 s->control = PARA_CTR_SELECT;
432 s->control |= PARA_CTR_INIT;
439 s->last_read_offset = ~0U;
442 /* If fd is zero, it means that the parallel device uses the console */
443 ParallelState *parallel_init(int base, qemu_irq irq, CharDriverState *chr)
448 s = qemu_mallocz(sizeof(ParallelState));
451 parallel_reset(s, irq, chr);
453 if (qemu_chr_ioctl(chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
459 register_ioport_write(base, 8, 1, parallel_ioport_write_hw, s);
460 register_ioport_read(base, 8, 1, parallel_ioport_read_hw, s);
461 register_ioport_write(base+4, 1, 2, parallel_ioport_eppdata_write_hw2, s);
462 register_ioport_read(base+4, 1, 2, parallel_ioport_eppdata_read_hw2, s);
463 register_ioport_write(base+4, 1, 4, parallel_ioport_eppdata_write_hw4, s);
464 register_ioport_read(base+4, 1, 4, parallel_ioport_eppdata_read_hw4, s);
465 register_ioport_write(base+0x400, 8, 1, parallel_ioport_ecp_write, s);
466 register_ioport_read(base+0x400, 8, 1, parallel_ioport_ecp_read, s);
469 register_ioport_write(base, 8, 1, parallel_ioport_write_sw, s);
470 register_ioport_read(base, 8, 1, parallel_ioport_read_sw, s);
475 /* Memory mapped interface */
476 static uint32_t parallel_mm_readb (void *opaque, target_phys_addr_t addr)
478 ParallelState *s = opaque;
480 return parallel_ioport_read_sw(s, (addr - s->base) >> s->it_shift) & 0xFF;
483 static void parallel_mm_writeb (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 & 0xFF);
491 static uint32_t parallel_mm_readw (void *opaque, target_phys_addr_t addr)
493 ParallelState *s = opaque;
495 return parallel_ioport_read_sw(s, (addr - s->base) >> s->it_shift) & 0xFFFF;
498 static void parallel_mm_writew (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 & 0xFFFF);
506 static uint32_t parallel_mm_readl (void *opaque, target_phys_addr_t addr)
508 ParallelState *s = opaque;
510 return parallel_ioport_read_sw(s, (addr - s->base) >> s->it_shift);
513 static void parallel_mm_writel (void *opaque,
514 target_phys_addr_t addr, uint32_t value)
516 ParallelState *s = opaque;
518 parallel_ioport_write_sw(s, (addr - s->base) >> s->it_shift, value);
521 static CPUReadMemoryFunc *parallel_mm_read_sw[] = {
527 static CPUWriteMemoryFunc *parallel_mm_write_sw[] = {
533 /* If fd is zero, it means that the parallel device uses the console */
534 ParallelState *parallel_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq, CharDriverState *chr)
539 s = qemu_mallocz(sizeof(ParallelState));
542 parallel_reset(s, irq, chr);
544 s->it_shift = it_shift;
546 io_sw = cpu_register_io_memory(0, parallel_mm_read_sw, parallel_mm_write_sw, s);
547 cpu_register_physical_memory(base, 8 << it_shift, io_sw);