Handle this at the ADB bus level so that individual implementations do not need to handle this themselves. Finally add an assert() into adb_request() to prevent developers from accidentally making an explicit ADB request without blocking autopoll. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Tested-by: Finn Thain <fthain@telegraphics.com.au> Acked-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20200623204936.24064-21-mark.cave-ayland@ilande.co.uk>
305 lines
7.9 KiB
C
305 lines
7.9 KiB
C
/*
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* QEMU ADB support
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*
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* Copyright (c) 2004 Fabrice Bellard
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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 "qemu/osdep.h"
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#include "hw/input/adb.h"
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#include "hw/qdev-properties.h"
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#include "migration/vmstate.h"
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#include "qemu/module.h"
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#include "qemu/timer.h"
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#include "adb-internal.h"
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/* error codes */
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#define ADB_RET_NOTPRESENT (-2)
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static void adb_device_reset(ADBDevice *d)
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{
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qdev_reset_all(DEVICE(d));
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}
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static int do_adb_request(ADBBusState *s, uint8_t *obuf, const uint8_t *buf,
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int len)
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{
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ADBDevice *d;
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ADBDeviceClass *adc;
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int devaddr, cmd, olen, i;
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cmd = buf[0] & 0xf;
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if (cmd == ADB_BUSRESET) {
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for (i = 0; i < s->nb_devices; i++) {
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d = s->devices[i];
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adb_device_reset(d);
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}
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s->status = 0;
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return 0;
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}
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s->pending = 0;
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for (i = 0; i < s->nb_devices; i++) {
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d = s->devices[i];
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adc = ADB_DEVICE_GET_CLASS(d);
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if (adc->devhasdata(d)) {
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s->pending |= (1 << d->devaddr);
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}
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}
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s->status = 0;
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devaddr = buf[0] >> 4;
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for (i = 0; i < s->nb_devices; i++) {
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d = s->devices[i];
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adc = ADB_DEVICE_GET_CLASS(d);
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if (d->devaddr == devaddr) {
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olen = adc->devreq(d, obuf, buf, len);
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if (!olen) {
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s->status |= ADB_STATUS_BUSTIMEOUT;
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}
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return olen;
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}
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}
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s->status |= ADB_STATUS_BUSTIMEOUT;
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return ADB_RET_NOTPRESENT;
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}
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int adb_request(ADBBusState *s, uint8_t *obuf, const uint8_t *buf, int len)
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{
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assert(s->autopoll_blocked);
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return do_adb_request(s, obuf, buf, len);
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}
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int adb_poll(ADBBusState *s, uint8_t *obuf, uint16_t poll_mask)
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{
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ADBDevice *d;
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int olen, i;
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uint8_t buf[1];
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olen = 0;
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for (i = 0; i < s->nb_devices; i++) {
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if (s->poll_index >= s->nb_devices) {
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s->poll_index = 0;
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}
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d = s->devices[s->poll_index];
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if ((1 << d->devaddr) & poll_mask) {
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buf[0] = ADB_READREG | (d->devaddr << 4);
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olen = do_adb_request(s, obuf + 1, buf, 1);
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/* if there is data, we poll again the same device */
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if (olen > 0) {
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s->status |= ADB_STATUS_POLLREPLY;
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obuf[0] = buf[0];
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olen++;
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return olen;
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}
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}
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s->poll_index++;
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}
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return olen;
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}
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void adb_set_autopoll_enabled(ADBBusState *s, bool enabled)
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{
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if (s->autopoll_enabled != enabled) {
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s->autopoll_enabled = enabled;
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if (s->autopoll_enabled) {
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timer_mod(s->autopoll_timer,
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qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
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s->autopoll_rate_ms);
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} else {
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timer_del(s->autopoll_timer);
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}
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}
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}
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void adb_set_autopoll_rate_ms(ADBBusState *s, int rate_ms)
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{
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s->autopoll_rate_ms = rate_ms;
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if (s->autopoll_enabled) {
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timer_mod(s->autopoll_timer,
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qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
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s->autopoll_rate_ms);
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}
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}
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void adb_set_autopoll_mask(ADBBusState *s, uint16_t mask)
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{
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if (s->autopoll_mask != mask) {
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s->autopoll_mask = mask;
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if (s->autopoll_enabled && s->autopoll_mask) {
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timer_mod(s->autopoll_timer,
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qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
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s->autopoll_rate_ms);
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} else {
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timer_del(s->autopoll_timer);
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}
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}
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}
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void adb_autopoll_block(ADBBusState *s)
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{
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s->autopoll_blocked = true;
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if (s->autopoll_enabled) {
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timer_del(s->autopoll_timer);
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}
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}
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void adb_autopoll_unblock(ADBBusState *s)
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{
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s->autopoll_blocked = false;
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if (s->autopoll_enabled) {
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timer_mod(s->autopoll_timer,
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qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
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s->autopoll_rate_ms);
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}
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}
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static void adb_autopoll(void *opaque)
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{
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ADBBusState *s = opaque;
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if (!s->autopoll_blocked) {
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s->autopoll_cb(s->autopoll_cb_opaque);
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}
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timer_mod(s->autopoll_timer,
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qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
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s->autopoll_rate_ms);
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}
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void adb_register_autopoll_callback(ADBBusState *s, void (*cb)(void *opaque),
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void *opaque)
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{
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s->autopoll_cb = cb;
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s->autopoll_cb_opaque = opaque;
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}
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static const VMStateDescription vmstate_adb_bus = {
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.name = "adb_bus",
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_TIMER_PTR(autopoll_timer, ADBBusState),
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VMSTATE_BOOL(autopoll_enabled, ADBBusState),
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VMSTATE_UINT8(autopoll_rate_ms, ADBBusState),
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VMSTATE_UINT16(autopoll_mask, ADBBusState),
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VMSTATE_BOOL(autopoll_blocked, ADBBusState),
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VMSTATE_END_OF_LIST()
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}
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};
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static void adb_bus_reset(BusState *qbus)
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{
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ADBBusState *adb_bus = ADB_BUS(qbus);
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adb_bus->autopoll_enabled = false;
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adb_bus->autopoll_mask = 0xffff;
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adb_bus->autopoll_rate_ms = 20;
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}
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static void adb_bus_realize(BusState *qbus, Error **errp)
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{
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ADBBusState *adb_bus = ADB_BUS(qbus);
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adb_bus->autopoll_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, adb_autopoll,
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adb_bus);
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vmstate_register(NULL, -1, &vmstate_adb_bus, adb_bus);
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}
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static void adb_bus_unrealize(BusState *qbus)
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{
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ADBBusState *adb_bus = ADB_BUS(qbus);
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timer_del(adb_bus->autopoll_timer);
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vmstate_unregister(NULL, &vmstate_adb_bus, adb_bus);
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}
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static void adb_bus_class_init(ObjectClass *klass, void *data)
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{
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BusClass *k = BUS_CLASS(klass);
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k->realize = adb_bus_realize;
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k->unrealize = adb_bus_unrealize;
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k->reset = adb_bus_reset;
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}
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static const TypeInfo adb_bus_type_info = {
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.name = TYPE_ADB_BUS,
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.parent = TYPE_BUS,
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.instance_size = sizeof(ADBBusState),
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.class_init = adb_bus_class_init,
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};
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const VMStateDescription vmstate_adb_device = {
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.name = "adb_device",
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_INT32(devaddr, ADBDevice),
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VMSTATE_INT32(handler, ADBDevice),
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VMSTATE_END_OF_LIST()
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}
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};
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static void adb_device_realizefn(DeviceState *dev, Error **errp)
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{
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ADBDevice *d = ADB_DEVICE(dev);
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ADBBusState *bus = ADB_BUS(qdev_get_parent_bus(dev));
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if (bus->nb_devices >= MAX_ADB_DEVICES) {
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return;
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}
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bus->devices[bus->nb_devices++] = d;
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}
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static void adb_device_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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dc->realize = adb_device_realizefn;
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dc->bus_type = TYPE_ADB_BUS;
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}
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static const TypeInfo adb_device_type_info = {
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.name = TYPE_ADB_DEVICE,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(ADBDevice),
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.abstract = true,
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.class_init = adb_device_class_init,
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};
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static void adb_register_types(void)
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{
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type_register_static(&adb_bus_type_info);
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type_register_static(&adb_device_type_info);
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}
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type_init(adb_register_types)
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