987 lines
29 KiB
C
987 lines
29 KiB
C
/*
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* CAN device - SJA1000 chip emulation for QEMU
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*
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* Copyright (c) 2013-2014 Jin Yang
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* Copyright (c) 2014-2018 Pavel Pisa
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*
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* Initial development supported by Google GSoC 2013 from RTEMS project slot
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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 "qemu/log.h"
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#include "chardev/char.h"
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#include "hw/irq.h"
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#include "migration/vmstate.h"
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#include "net/can_emu.h"
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#include "can_sja1000.h"
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#ifndef DEBUG_FILTER
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#define DEBUG_FILTER 0
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#endif /*DEBUG_FILTER*/
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#ifndef DEBUG_CAN
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#define DEBUG_CAN 0
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#endif /*DEBUG_CAN*/
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#define DPRINTF(fmt, ...) \
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do { \
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if (DEBUG_CAN) { \
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qemu_log("[cansja]: " fmt , ## __VA_ARGS__); \
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} \
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} while (0)
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static void can_sja_software_reset(CanSJA1000State *s)
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{
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s->mode &= ~0x31;
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s->mode |= 0x01;
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s->status_pel &= ~0x37;
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s->status_pel |= 0x34;
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s->rxbuf_start = 0x00;
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s->rxmsg_cnt = 0x00;
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s->rx_cnt = 0x00;
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}
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void can_sja_hardware_reset(CanSJA1000State *s)
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{
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/* Reset by hardware, p10 */
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s->mode = 0x01;
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s->status_pel = 0x3c;
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s->interrupt_pel = 0x00;
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s->clock = 0x00;
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s->rxbuf_start = 0x00;
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s->rxmsg_cnt = 0x00;
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s->rx_cnt = 0x00;
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s->control = 0x01;
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s->status_bas = 0x0c;
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s->interrupt_bas = 0x00;
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qemu_irq_lower(s->irq);
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}
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static
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void can_sja_single_filter(struct qemu_can_filter *filter,
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const uint8_t *acr, const uint8_t *amr, int extended)
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{
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if (extended) {
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filter->can_id = (uint32_t)acr[0] << 21;
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filter->can_id |= (uint32_t)acr[1] << 13;
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filter->can_id |= (uint32_t)acr[2] << 5;
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filter->can_id |= (uint32_t)acr[3] >> 3;
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if (acr[3] & 4) {
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filter->can_id |= QEMU_CAN_RTR_FLAG;
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}
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filter->can_mask = (uint32_t)amr[0] << 21;
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filter->can_mask |= (uint32_t)amr[1] << 13;
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filter->can_mask |= (uint32_t)amr[2] << 5;
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filter->can_mask |= (uint32_t)amr[3] >> 3;
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filter->can_mask = ~filter->can_mask & QEMU_CAN_EFF_MASK;
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if (!(amr[3] & 4)) {
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filter->can_mask |= QEMU_CAN_RTR_FLAG;
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}
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} else {
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filter->can_id = (uint32_t)acr[0] << 3;
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filter->can_id |= (uint32_t)acr[1] >> 5;
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if (acr[1] & 0x10) {
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filter->can_id |= QEMU_CAN_RTR_FLAG;
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}
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filter->can_mask = (uint32_t)amr[0] << 3;
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filter->can_mask |= (uint32_t)amr[1] << 5;
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filter->can_mask = ~filter->can_mask & QEMU_CAN_SFF_MASK;
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if (!(amr[1] & 0x10)) {
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filter->can_mask |= QEMU_CAN_RTR_FLAG;
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}
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}
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}
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static
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void can_sja_dual_filter(struct qemu_can_filter *filter,
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const uint8_t *acr, const uint8_t *amr, int extended)
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{
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if (extended) {
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filter->can_id = (uint32_t)acr[0] << 21;
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filter->can_id |= (uint32_t)acr[1] << 13;
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filter->can_mask = (uint32_t)amr[0] << 21;
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filter->can_mask |= (uint32_t)amr[1] << 13;
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filter->can_mask = ~filter->can_mask & QEMU_CAN_EFF_MASK & ~0x1fff;
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} else {
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filter->can_id = (uint32_t)acr[0] << 3;
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filter->can_id |= (uint32_t)acr[1] >> 5;
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if (acr[1] & 0x10) {
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filter->can_id |= QEMU_CAN_RTR_FLAG;
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}
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filter->can_mask = (uint32_t)amr[0] << 3;
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filter->can_mask |= (uint32_t)amr[1] >> 5;
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filter->can_mask = ~filter->can_mask & QEMU_CAN_SFF_MASK;
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if (!(amr[1] & 0x10)) {
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filter->can_mask |= QEMU_CAN_RTR_FLAG;
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}
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}
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}
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/* Details in DS-p22, what we need to do here is to test the data. */
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static
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int can_sja_accept_filter(CanSJA1000State *s,
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const qemu_can_frame *frame)
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{
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struct qemu_can_filter filter;
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if (s->clock & 0x80) { /* PeliCAN Mode */
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if (s->mode & (1 << 3)) { /* Single mode. */
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if (frame->can_id & QEMU_CAN_EFF_FLAG) { /* EFF */
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can_sja_single_filter(&filter,
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s->code_mask + 0, s->code_mask + 4, 1);
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if (!can_bus_filter_match(&filter, frame->can_id)) {
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return 0;
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}
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} else { /* SFF */
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can_sja_single_filter(&filter,
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s->code_mask + 0, s->code_mask + 4, 0);
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if (!can_bus_filter_match(&filter, frame->can_id)) {
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return 0;
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}
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if (frame->can_id & QEMU_CAN_RTR_FLAG) { /* RTR */
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return 1;
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}
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if (frame->can_dlc == 0) {
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return 1;
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}
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if ((frame->data[0] & ~(s->code_mask[6])) !=
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(s->code_mask[2] & ~(s->code_mask[6]))) {
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return 0;
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}
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if (frame->can_dlc < 2) {
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return 1;
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}
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if ((frame->data[1] & ~(s->code_mask[7])) ==
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(s->code_mask[3] & ~(s->code_mask[7]))) {
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return 1;
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}
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return 0;
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}
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} else { /* Dual mode */
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if (frame->can_id & QEMU_CAN_EFF_FLAG) { /* EFF */
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can_sja_dual_filter(&filter,
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s->code_mask + 0, s->code_mask + 4, 1);
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if (can_bus_filter_match(&filter, frame->can_id)) {
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return 1;
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}
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can_sja_dual_filter(&filter,
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s->code_mask + 2, s->code_mask + 6, 1);
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if (can_bus_filter_match(&filter, frame->can_id)) {
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return 1;
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}
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return 0;
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} else {
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can_sja_dual_filter(&filter,
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s->code_mask + 0, s->code_mask + 4, 0);
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if (can_bus_filter_match(&filter, frame->can_id)) {
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uint8_t expect;
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uint8_t mask;
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expect = s->code_mask[1] << 4;
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expect |= s->code_mask[3] & 0x0f;
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mask = s->code_mask[5] << 4;
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mask |= s->code_mask[7] & 0x0f;
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mask = ~mask & 0xff;
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if ((frame->data[0] & mask) ==
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(expect & mask)) {
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return 1;
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}
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}
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can_sja_dual_filter(&filter,
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s->code_mask + 2, s->code_mask + 6, 0);
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if (can_bus_filter_match(&filter, frame->can_id)) {
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return 1;
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}
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return 0;
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}
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}
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}
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return 1;
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}
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static void can_display_msg(const char *prefix, const qemu_can_frame *msg)
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{
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int i;
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FILE *logfile = qemu_log_lock();
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qemu_log("%s%03X [%01d] %s %s",
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prefix,
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msg->can_id & QEMU_CAN_EFF_MASK,
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msg->can_dlc,
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msg->can_id & QEMU_CAN_EFF_FLAG ? "EFF" : "SFF",
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msg->can_id & QEMU_CAN_RTR_FLAG ? "RTR" : "DAT");
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for (i = 0; i < msg->can_dlc; i++) {
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qemu_log(" %02X", msg->data[i]);
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}
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qemu_log("\n");
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qemu_log_flush();
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qemu_log_unlock(logfile);
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}
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static void buff2frame_pel(const uint8_t *buff, qemu_can_frame *frame)
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{
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uint8_t i;
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frame->flags = 0;
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frame->can_id = 0;
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if (buff[0] & 0x40) { /* RTR */
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frame->can_id = QEMU_CAN_RTR_FLAG;
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}
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frame->can_dlc = buff[0] & 0x0f;
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if (frame->can_dlc > 8) {
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frame->can_dlc = 8;
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}
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if (buff[0] & 0x80) { /* Extended */
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frame->can_id |= QEMU_CAN_EFF_FLAG;
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frame->can_id |= buff[1] << 21; /* ID.28~ID.21 */
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frame->can_id |= buff[2] << 13; /* ID.20~ID.13 */
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frame->can_id |= buff[3] << 5;
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frame->can_id |= buff[4] >> 3;
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for (i = 0; i < frame->can_dlc; i++) {
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frame->data[i] = buff[5 + i];
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}
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for (; i < 8; i++) {
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frame->data[i] = 0;
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}
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} else {
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frame->can_id |= buff[1] << 3;
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frame->can_id |= buff[2] >> 5;
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for (i = 0; i < frame->can_dlc; i++) {
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frame->data[i] = buff[3 + i];
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}
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for (; i < 8; i++) {
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frame->data[i] = 0;
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}
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}
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}
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static void buff2frame_bas(const uint8_t *buff, qemu_can_frame *frame)
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{
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uint8_t i;
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frame->flags = 0;
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frame->can_id = ((buff[0] << 3) & (0xff << 3)) + ((buff[1] >> 5) & 0x07);
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if (buff[1] & 0x10) { /* RTR */
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frame->can_id = QEMU_CAN_RTR_FLAG;
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}
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frame->can_dlc = buff[1] & 0x0f;
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if (frame->can_dlc > 8) {
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frame->can_dlc = 8;
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}
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for (i = 0; i < frame->can_dlc; i++) {
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frame->data[i] = buff[2 + i];
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}
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for (; i < 8; i++) {
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frame->data[i] = 0;
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}
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}
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static int frame2buff_pel(const qemu_can_frame *frame, uint8_t *buff)
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{
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int i;
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int dlen = frame->can_dlc;
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if (frame->can_id & QEMU_CAN_ERR_FLAG) { /* error frame, NOT support now. */
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return -1;
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}
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if (dlen > 8) {
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return -1;
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}
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buff[0] = 0x0f & frame->can_dlc; /* DLC */
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if (frame->can_id & QEMU_CAN_RTR_FLAG) { /* RTR */
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buff[0] |= (1 << 6);
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}
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if (frame->can_id & QEMU_CAN_EFF_FLAG) { /* EFF */
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buff[0] |= (1 << 7);
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buff[1] = extract32(frame->can_id, 21, 8); /* ID.28~ID.21 */
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buff[2] = extract32(frame->can_id, 13, 8); /* ID.20~ID.13 */
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buff[3] = extract32(frame->can_id, 5, 8); /* ID.12~ID.05 */
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buff[4] = extract32(frame->can_id, 0, 5) << 3; /* ID.04~ID.00,xxx */
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for (i = 0; i < dlen; i++) {
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buff[5 + i] = frame->data[i];
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}
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return dlen + 5;
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} else { /* SFF */
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buff[1] = extract32(frame->can_id, 3, 8); /* ID.10~ID.03 */
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buff[2] = extract32(frame->can_id, 0, 3) << 5; /* ID.02~ID.00,xxxxx */
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for (i = 0; i < dlen; i++) {
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buff[3 + i] = frame->data[i];
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}
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return dlen + 3;
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}
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return -1;
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}
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static int frame2buff_bas(const qemu_can_frame *frame, uint8_t *buff)
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{
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int i;
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int dlen = frame->can_dlc;
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/*
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* EFF, no support for BasicMode
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* No use for Error frames now,
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* they could be used in future to update SJA1000 error state
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*/
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if ((frame->can_id & QEMU_CAN_EFF_FLAG) ||
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(frame->can_id & QEMU_CAN_ERR_FLAG)) {
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return -1;
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}
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if (dlen > 8) {
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return -1;
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}
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buff[0] = extract32(frame->can_id, 3, 8); /* ID.10~ID.03 */
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buff[1] = extract32(frame->can_id, 0, 3) << 5; /* ID.02~ID.00,xxxxx */
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if (frame->can_id & QEMU_CAN_RTR_FLAG) { /* RTR */
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buff[1] |= (1 << 4);
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}
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buff[1] |= frame->can_dlc & 0x0f;
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for (i = 0; i < dlen; i++) {
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buff[2 + i] = frame->data[i];
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}
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return dlen + 2;
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}
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static void can_sja_update_pel_irq(CanSJA1000State *s)
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{
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if (s->interrupt_en & s->interrupt_pel) {
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qemu_irq_raise(s->irq);
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} else {
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qemu_irq_lower(s->irq);
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}
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}
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static void can_sja_update_bas_irq(CanSJA1000State *s)
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{
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if ((s->control >> 1) & s->interrupt_bas) {
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qemu_irq_raise(s->irq);
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} else {
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qemu_irq_lower(s->irq);
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}
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}
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void can_sja_mem_write(CanSJA1000State *s, hwaddr addr, uint64_t val,
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unsigned size)
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{
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qemu_can_frame frame;
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uint32_t tmp;
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uint8_t tmp8, count;
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DPRINTF("write 0x%02llx addr 0x%02x\n",
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(unsigned long long)val, (unsigned int)addr);
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if (addr > CAN_SJA_MEM_SIZE) {
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return ;
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}
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if (s->clock & 0x80) { /* PeliCAN Mode */
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switch (addr) {
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case SJA_MOD: /* Mode register */
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s->mode = 0x1f & val;
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if ((s->mode & 0x01) && ((val & 0x01) == 0)) {
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/* Go to operation mode from reset mode. */
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if (s->mode & (1 << 3)) { /* Single mode. */
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/* For EFF */
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can_sja_single_filter(&s->filter[0],
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s->code_mask + 0, s->code_mask + 4, 1);
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/* For SFF */
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can_sja_single_filter(&s->filter[1],
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s->code_mask + 0, s->code_mask + 4, 0);
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can_bus_client_set_filters(&s->bus_client, s->filter, 2);
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} else { /* Dual mode */
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/* For EFF */
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can_sja_dual_filter(&s->filter[0],
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s->code_mask + 0, s->code_mask + 4, 1);
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can_sja_dual_filter(&s->filter[1],
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s->code_mask + 2, s->code_mask + 6, 1);
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/* For SFF */
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can_sja_dual_filter(&s->filter[2],
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s->code_mask + 0, s->code_mask + 4, 0);
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can_sja_dual_filter(&s->filter[3],
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s->code_mask + 2, s->code_mask + 6, 0);
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can_bus_client_set_filters(&s->bus_client, s->filter, 4);
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}
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s->rxmsg_cnt = 0;
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s->rx_cnt = 0;
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}
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break;
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case SJA_CMR: /* Command register. */
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if (0x01 & val) { /* Send transmission request. */
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buff2frame_pel(s->tx_buff, &frame);
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if (DEBUG_FILTER) {
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can_display_msg("[cansja]: Tx request " , &frame);
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}
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/*
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* Clear transmission complete status,
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* and Transmit Buffer Status.
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* write to the backends.
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*/
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s->status_pel &= ~(3 << 2);
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can_bus_client_send(&s->bus_client, &frame, 1);
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/*
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* Set transmission complete status
|
|
* and Transmit Buffer Status.
|
|
*/
|
|
s->status_pel |= (3 << 2);
|
|
|
|
/* Clear transmit status. */
|
|
s->status_pel &= ~(1 << 5);
|
|
s->interrupt_pel |= 0x02;
|
|
can_sja_update_pel_irq(s);
|
|
}
|
|
if (0x04 & val) { /* Release Receive Buffer */
|
|
if (s->rxmsg_cnt <= 0) {
|
|
break;
|
|
}
|
|
|
|
tmp8 = s->rx_buff[s->rxbuf_start]; count = 0;
|
|
if (tmp8 & (1 << 7)) { /* EFF */
|
|
count += 2;
|
|
}
|
|
count += 3;
|
|
if (!(tmp8 & (1 << 6))) { /* DATA */
|
|
count += (tmp8 & 0x0f);
|
|
}
|
|
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: message released from "
|
|
"Rx FIFO cnt=%d, count=%d\n", s->rx_cnt, count);
|
|
}
|
|
|
|
s->rxbuf_start += count;
|
|
s->rxbuf_start %= SJA_RCV_BUF_LEN;
|
|
|
|
s->rx_cnt -= count;
|
|
s->rxmsg_cnt--;
|
|
if (s->rxmsg_cnt == 0) {
|
|
s->status_pel &= ~(1 << 0);
|
|
s->interrupt_pel &= ~(1 << 0);
|
|
can_sja_update_pel_irq(s);
|
|
}
|
|
}
|
|
if (0x08 & val) { /* Clear data overrun */
|
|
s->status_pel &= ~(1 << 1);
|
|
s->interrupt_pel &= ~(1 << 3);
|
|
can_sja_update_pel_irq(s);
|
|
}
|
|
break;
|
|
case SJA_SR: /* Status register */
|
|
case SJA_IR: /* Interrupt register */
|
|
break; /* Do nothing */
|
|
case SJA_IER: /* Interrupt enable register */
|
|
s->interrupt_en = val;
|
|
break;
|
|
case 16: /* RX frame information addr16-28. */
|
|
s->status_pel |= (1 << 5); /* Set transmit status. */
|
|
/* fallthrough */
|
|
case 17 ... 28:
|
|
if (s->mode & 0x01) { /* Reset mode */
|
|
if (addr < 24) {
|
|
s->code_mask[addr - 16] = val;
|
|
}
|
|
} else { /* Operation mode */
|
|
s->tx_buff[addr - 16] = val; /* Store to TX buffer directly. */
|
|
}
|
|
break;
|
|
case SJA_CDR:
|
|
s->clock = val;
|
|
break;
|
|
}
|
|
} else { /* Basic Mode */
|
|
switch (addr) {
|
|
case SJA_BCAN_CTR: /* Control register, addr 0 */
|
|
if ((s->control & 0x01) && ((val & 0x01) == 0)) {
|
|
/* Go to operation mode from reset mode. */
|
|
s->filter[0].can_id = (s->code << 3) & (0xff << 3);
|
|
tmp = (~(s->mask << 3)) & (0xff << 3);
|
|
tmp |= QEMU_CAN_EFF_FLAG; /* Only Basic CAN Frame. */
|
|
s->filter[0].can_mask = tmp;
|
|
can_bus_client_set_filters(&s->bus_client, s->filter, 1);
|
|
|
|
s->rxmsg_cnt = 0;
|
|
s->rx_cnt = 0;
|
|
} else if (!(s->control & 0x01) && !(val & 0x01)) {
|
|
can_sja_software_reset(s);
|
|
}
|
|
|
|
s->control = 0x1f & val;
|
|
break;
|
|
case SJA_BCAN_CMR: /* Command register, addr 1 */
|
|
if (0x01 & val) { /* Send transmission request. */
|
|
buff2frame_bas(s->tx_buff, &frame);
|
|
if (DEBUG_FILTER) {
|
|
can_display_msg("[cansja]: Tx request " , &frame);
|
|
}
|
|
|
|
/*
|
|
* Clear transmission complete status,
|
|
* and Transmit Buffer Status.
|
|
*/
|
|
s->status_bas &= ~(3 << 2);
|
|
|
|
/* write to the backends. */
|
|
can_bus_client_send(&s->bus_client, &frame, 1);
|
|
|
|
/*
|
|
* Set transmission complete status,
|
|
* and Transmit Buffer Status.
|
|
*/
|
|
s->status_bas |= (3 << 2);
|
|
|
|
/* Clear transmit status. */
|
|
s->status_bas &= ~(1 << 5);
|
|
s->interrupt_bas |= 0x02;
|
|
can_sja_update_bas_irq(s);
|
|
}
|
|
if (0x04 & val) { /* Release Receive Buffer */
|
|
if (s->rxmsg_cnt <= 0) {
|
|
break;
|
|
}
|
|
|
|
tmp8 = s->rx_buff[(s->rxbuf_start + 1) % SJA_RCV_BUF_LEN];
|
|
count = 2 + (tmp8 & 0x0f);
|
|
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: message released from "
|
|
"Rx FIFO cnt=%d, count=%d\n", s->rx_cnt, count);
|
|
}
|
|
|
|
s->rxbuf_start += count;
|
|
s->rxbuf_start %= SJA_RCV_BUF_LEN;
|
|
s->rx_cnt -= count;
|
|
s->rxmsg_cnt--;
|
|
|
|
if (s->rxmsg_cnt == 0) {
|
|
s->status_bas &= ~(1 << 0);
|
|
s->interrupt_bas &= ~(1 << 0);
|
|
can_sja_update_bas_irq(s);
|
|
}
|
|
}
|
|
if (0x08 & val) { /* Clear data overrun */
|
|
s->status_bas &= ~(1 << 1);
|
|
s->interrupt_bas &= ~(1 << 3);
|
|
can_sja_update_bas_irq(s);
|
|
}
|
|
break;
|
|
case 4:
|
|
s->code = val;
|
|
break;
|
|
case 5:
|
|
s->mask = val;
|
|
break;
|
|
case 10:
|
|
s->status_bas |= (1 << 5); /* Set transmit status. */
|
|
/* fallthrough */
|
|
case 11 ... 19:
|
|
if ((s->control & 0x01) == 0) { /* Operation mode */
|
|
s->tx_buff[addr - 10] = val; /* Store to TX buffer directly. */
|
|
}
|
|
break;
|
|
case SJA_CDR:
|
|
s->clock = val;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
uint64_t can_sja_mem_read(CanSJA1000State *s, hwaddr addr, unsigned size)
|
|
{
|
|
uint64_t temp = 0;
|
|
|
|
DPRINTF("read addr 0x%02x ...\n", (unsigned int)addr);
|
|
|
|
if (addr > CAN_SJA_MEM_SIZE) {
|
|
return 0;
|
|
}
|
|
|
|
if (s->clock & 0x80) { /* PeliCAN Mode */
|
|
switch (addr) {
|
|
case SJA_MOD: /* Mode register, addr 0 */
|
|
temp = s->mode;
|
|
break;
|
|
case SJA_CMR: /* Command register, addr 1 */
|
|
temp = 0x00; /* Command register, cannot be read. */
|
|
break;
|
|
case SJA_SR: /* Status register, addr 2 */
|
|
temp = s->status_pel;
|
|
break;
|
|
case SJA_IR: /* Interrupt register, addr 3 */
|
|
temp = s->interrupt_pel;
|
|
s->interrupt_pel = 0;
|
|
if (s->rxmsg_cnt) {
|
|
s->interrupt_pel |= (1 << 0); /* Receive interrupt. */
|
|
}
|
|
can_sja_update_pel_irq(s);
|
|
break;
|
|
case SJA_IER: /* Interrupt enable register, addr 4 */
|
|
temp = s->interrupt_en;
|
|
break;
|
|
case 5: /* Reserved */
|
|
case 6: /* Bus timing 0, hardware related, not support now. */
|
|
case 7: /* Bus timing 1, hardware related, not support now. */
|
|
case 8: /*
|
|
* Output control register, hardware related,
|
|
* not supported for now.
|
|
*/
|
|
case 9: /* Test. */
|
|
case 10 ... 15: /* Reserved */
|
|
temp = 0x00;
|
|
break;
|
|
|
|
case 16 ... 28:
|
|
if (s->mode & 0x01) { /* Reset mode */
|
|
if (addr < 24) {
|
|
temp = s->code_mask[addr - 16];
|
|
} else {
|
|
temp = 0x00;
|
|
}
|
|
} else { /* Operation mode */
|
|
temp = s->rx_buff[(s->rxbuf_start + addr - 16) %
|
|
SJA_RCV_BUF_LEN];
|
|
}
|
|
break;
|
|
case SJA_CDR:
|
|
temp = s->clock;
|
|
break;
|
|
default:
|
|
temp = 0xff;
|
|
}
|
|
} else { /* Basic Mode */
|
|
switch (addr) {
|
|
case SJA_BCAN_CTR: /* Control register, addr 0 */
|
|
temp = s->control;
|
|
break;
|
|
case SJA_BCAN_SR: /* Status register, addr 2 */
|
|
temp = s->status_bas;
|
|
break;
|
|
case SJA_BCAN_IR: /* Interrupt register, addr 3 */
|
|
temp = s->interrupt_bas;
|
|
s->interrupt_bas = 0;
|
|
if (s->rxmsg_cnt) {
|
|
s->interrupt_bas |= (1 << 0); /* Receive interrupt. */
|
|
}
|
|
can_sja_update_bas_irq(s);
|
|
break;
|
|
case 4:
|
|
temp = s->code;
|
|
break;
|
|
case 5:
|
|
temp = s->mask;
|
|
break;
|
|
case 20 ... 29:
|
|
temp = s->rx_buff[(s->rxbuf_start + addr - 20) % SJA_RCV_BUF_LEN];
|
|
break;
|
|
case 31:
|
|
temp = s->clock;
|
|
break;
|
|
default:
|
|
temp = 0xff;
|
|
break;
|
|
}
|
|
}
|
|
DPRINTF("read addr 0x%02x, %d bytes, content 0x%02lx\n",
|
|
(int)addr, size, (long unsigned int)temp);
|
|
|
|
return temp;
|
|
}
|
|
|
|
bool can_sja_can_receive(CanBusClientState *client)
|
|
{
|
|
CanSJA1000State *s = container_of(client, CanSJA1000State, bus_client);
|
|
|
|
if (s->clock & 0x80) { /* PeliCAN Mode */
|
|
if (s->mode & 0x01) { /* reset mode. */
|
|
return false;
|
|
}
|
|
} else { /* BasicCAN mode */
|
|
if (s->control & 0x01) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true; /* always return true, when operation mode */
|
|
}
|
|
|
|
ssize_t can_sja_receive(CanBusClientState *client, const qemu_can_frame *frames,
|
|
size_t frames_cnt)
|
|
{
|
|
CanSJA1000State *s = container_of(client, CanSJA1000State, bus_client);
|
|
static uint8_t rcv[SJA_MSG_MAX_LEN];
|
|
int i;
|
|
int ret = -1;
|
|
const qemu_can_frame *frame = frames;
|
|
|
|
if (frames_cnt <= 0) {
|
|
return 0;
|
|
}
|
|
if (frame->flags & QEMU_CAN_FRMF_TYPE_FD) {
|
|
if (DEBUG_FILTER) {
|
|
can_display_msg("[cansja]: ignor fd frame ", frame);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
if (DEBUG_FILTER) {
|
|
can_display_msg("[cansja]: receive ", frame);
|
|
}
|
|
|
|
if (s->clock & 0x80) { /* PeliCAN Mode */
|
|
|
|
/* the CAN controller is receiving a message */
|
|
s->status_pel |= (1 << 4);
|
|
|
|
if (can_sja_accept_filter(s, frame) == 0) {
|
|
s->status_pel &= ~(1 << 4);
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: filter rejects message\n");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
ret = frame2buff_pel(frame, rcv);
|
|
if (ret < 0) {
|
|
s->status_pel &= ~(1 << 4);
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: message store failed\n");
|
|
}
|
|
return ret; /* maybe not support now. */
|
|
}
|
|
|
|
if (s->rx_cnt + ret > SJA_RCV_BUF_LEN) { /* Data overrun. */
|
|
s->status_pel |= (1 << 1); /* Overrun status */
|
|
s->interrupt_pel |= (1 << 3);
|
|
s->status_pel &= ~(1 << 4);
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: receive FIFO overrun\n");
|
|
}
|
|
can_sja_update_pel_irq(s);
|
|
return ret;
|
|
}
|
|
s->rx_cnt += ret;
|
|
s->rxmsg_cnt++;
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: message stored in receive FIFO\n");
|
|
}
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
s->rx_buff[(s->rx_ptr++) % SJA_RCV_BUF_LEN] = rcv[i];
|
|
}
|
|
s->rx_ptr %= SJA_RCV_BUF_LEN; /* update the pointer. */
|
|
|
|
s->status_pel |= 0x01; /* Set the Receive Buffer Status. DS-p23 */
|
|
s->interrupt_pel |= 0x01;
|
|
s->status_pel &= ~(1 << 4);
|
|
s->status_pel |= (1 << 0);
|
|
can_sja_update_pel_irq(s);
|
|
} else { /* BasicCAN mode */
|
|
|
|
/* the CAN controller is receiving a message */
|
|
s->status_bas |= (1 << 4);
|
|
|
|
ret = frame2buff_bas(frame, rcv);
|
|
if (ret < 0) {
|
|
s->status_bas &= ~(1 << 4);
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: message store failed\n");
|
|
}
|
|
return ret; /* maybe not support now. */
|
|
}
|
|
|
|
if (s->rx_cnt + ret > SJA_RCV_BUF_LEN) { /* Data overrun. */
|
|
s->status_bas |= (1 << 1); /* Overrun status */
|
|
s->status_bas &= ~(1 << 4);
|
|
s->interrupt_bas |= (1 << 3);
|
|
can_sja_update_bas_irq(s);
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: receive FIFO overrun\n");
|
|
}
|
|
return ret;
|
|
}
|
|
s->rx_cnt += ret;
|
|
s->rxmsg_cnt++;
|
|
|
|
if (DEBUG_FILTER) {
|
|
qemu_log("[cansja]: message stored\n");
|
|
}
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
s->rx_buff[(s->rx_ptr++) % SJA_RCV_BUF_LEN] = rcv[i];
|
|
}
|
|
s->rx_ptr %= SJA_RCV_BUF_LEN; /* update the pointer. */
|
|
|
|
s->status_bas |= 0x01; /* Set the Receive Buffer Status. DS-p15 */
|
|
s->status_bas &= ~(1 << 4);
|
|
s->interrupt_bas |= (1 << 0);
|
|
can_sja_update_bas_irq(s);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static CanBusClientInfo can_sja_bus_client_info = {
|
|
.can_receive = can_sja_can_receive,
|
|
.receive = can_sja_receive,
|
|
};
|
|
|
|
|
|
int can_sja_connect_to_bus(CanSJA1000State *s, CanBusState *bus)
|
|
{
|
|
s->bus_client.info = &can_sja_bus_client_info;
|
|
|
|
if (!bus) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (can_bus_insert_client(bus, &s->bus_client) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void can_sja_disconnect(CanSJA1000State *s)
|
|
{
|
|
can_bus_remove_client(&s->bus_client);
|
|
}
|
|
|
|
int can_sja_init(CanSJA1000State *s, qemu_irq irq)
|
|
{
|
|
s->irq = irq;
|
|
|
|
qemu_irq_lower(s->irq);
|
|
|
|
can_sja_hardware_reset(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const VMStateDescription vmstate_qemu_can_filter = {
|
|
.name = "qemu_can_filter",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(can_id, qemu_can_filter),
|
|
VMSTATE_UINT32(can_mask, qemu_can_filter),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static int can_sja_post_load(void *opaque, int version_id)
|
|
{
|
|
CanSJA1000State *s = opaque;
|
|
if (s->clock & 0x80) { /* PeliCAN Mode */
|
|
can_sja_update_pel_irq(s);
|
|
} else {
|
|
can_sja_update_bas_irq(s);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* VMState is needed for live migration of QEMU images */
|
|
const VMStateDescription vmstate_can_sja = {
|
|
.name = "can_sja",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.post_load = can_sja_post_load,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT8(mode, CanSJA1000State),
|
|
|
|
VMSTATE_UINT8(status_pel, CanSJA1000State),
|
|
VMSTATE_UINT8(interrupt_pel, CanSJA1000State),
|
|
VMSTATE_UINT8(interrupt_en, CanSJA1000State),
|
|
VMSTATE_UINT8(rxmsg_cnt, CanSJA1000State),
|
|
VMSTATE_UINT8(rxbuf_start, CanSJA1000State),
|
|
VMSTATE_UINT8(clock, CanSJA1000State),
|
|
|
|
VMSTATE_BUFFER(code_mask, CanSJA1000State),
|
|
VMSTATE_BUFFER(tx_buff, CanSJA1000State),
|
|
|
|
VMSTATE_BUFFER(rx_buff, CanSJA1000State),
|
|
|
|
VMSTATE_UINT32(rx_ptr, CanSJA1000State),
|
|
VMSTATE_UINT32(rx_cnt, CanSJA1000State),
|
|
|
|
VMSTATE_UINT8(control, CanSJA1000State),
|
|
|
|
VMSTATE_UINT8(status_bas, CanSJA1000State),
|
|
VMSTATE_UINT8(interrupt_bas, CanSJA1000State),
|
|
VMSTATE_UINT8(code, CanSJA1000State),
|
|
VMSTATE_UINT8(mask, CanSJA1000State),
|
|
|
|
VMSTATE_STRUCT_ARRAY(filter, CanSJA1000State, 4, 0,
|
|
vmstate_qemu_can_filter, qemu_can_filter),
|
|
|
|
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|