* [PATCH v3 1/3] hw/net: Add npcm7xx emc model
2021-02-09 1:55 [PATCH v3 0/3] Add npcm7xx emc model Doug Evans via
@ 2021-02-09 1:55 ` Doug Evans via
2021-02-09 1:55 ` [PATCH v3 2/3] hw/arm: " Doug Evans via
` (2 subsequent siblings)
3 siblings, 0 replies; 7+ messages in thread
From: Doug Evans via @ 2021-02-09 1:55 UTC (permalink / raw)
To: qemu-devel; +Cc: Jason Wang, Peter Maydell, Hao Wu, Avi Fishman, Doug Evans
This is a 10/100 ethernet device that has several features.
Only the ones needed by the Linux driver have been implemented.
See npcm7xx_emc.c for a list of unimplemented features.
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Avi Fishman <avi.fishman@nuvoton.com>
Signed-off-by: Doug Evans <dje@google.com>
---
Differences from v2:
- move call to qemu_set_irq
- remove use of C99 mixed decls/statements
- add use of g_autofree
hw/net/meson.build | 1 +
hw/net/npcm7xx_emc.c | 857 +++++++++++++++++++++++++++++++++++
hw/net/trace-events | 17 +
include/hw/net/npcm7xx_emc.h | 286 ++++++++++++
4 files changed, 1161 insertions(+)
create mode 100644 hw/net/npcm7xx_emc.c
create mode 100644 include/hw/net/npcm7xx_emc.h
diff --git a/hw/net/meson.build b/hw/net/meson.build
index 4a7051b54a..af0749c42b 100644
--- a/hw/net/meson.build
+++ b/hw/net/meson.build
@@ -35,6 +35,7 @@ softmmu_ss.add(when: 'CONFIG_I82596_COMMON', if_true: files('i82596.c'))
softmmu_ss.add(when: 'CONFIG_SUNHME', if_true: files('sunhme.c'))
softmmu_ss.add(when: 'CONFIG_FTGMAC100', if_true: files('ftgmac100.c'))
softmmu_ss.add(when: 'CONFIG_SUNGEM', if_true: files('sungem.c'))
+softmmu_ss.add(when: 'CONFIG_NPCM7XX', if_true: files('npcm7xx_emc.c'))
softmmu_ss.add(when: 'CONFIG_ETRAXFS', if_true: files('etraxfs_eth.c'))
softmmu_ss.add(when: 'CONFIG_COLDFIRE', if_true: files('mcf_fec.c'))
diff --git a/hw/net/npcm7xx_emc.c b/hw/net/npcm7xx_emc.c
new file mode 100644
index 0000000000..714a742ba7
--- /dev/null
+++ b/hw/net/npcm7xx_emc.c
@@ -0,0 +1,857 @@
+/*
+ * Nuvoton NPCM7xx EMC Module
+ *
+ * Copyright 2020 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * Unsupported/unimplemented features:
+ * - MCMDR.FDUP (full duplex) is ignored, half duplex is not supported
+ * - Only CAM0 is supported, CAM[1-15] are not
+ * - writes to CAMEN.[1-15] are ignored, these bits always read as zeroes
+ * - MII is not implemented, MIIDA.BUSY and MIID always return zero
+ * - MCMDR.LBK is not implemented
+ * - MCMDR.{OPMOD,ENSQE,AEP,ARP} are not supported
+ * - H/W FIFOs are not supported, MCMDR.FFTCR is ignored
+ * - MGSTA.SQE is not supported
+ * - pause and control frames are not implemented
+ * - MGSTA.CCNT is not supported
+ * - MPCNT, DMARFS are not implemented
+ */
+
+#include "qemu/osdep.h"
+
+/* For crc32 */
+#include <zlib.h>
+
+#include "qemu-common.h"
+#include "hw/irq.h"
+#include "hw/qdev-clock.h"
+#include "hw/qdev-properties.h"
+#include "hw/net/npcm7xx_emc.h"
+#include "net/eth.h"
+#include "migration/vmstate.h"
+#include "qemu/bitops.h"
+#include "qemu/error-report.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qemu/units.h"
+#include "sysemu/dma.h"
+#include "trace.h"
+
+#define CRC_LENGTH 4
+
+/*
+ * The maximum size of a (layer 2) ethernet frame as defined by 802.3.
+ * 1518 = 6(dest macaddr) + 6(src macaddr) + 2(proto) + 4(crc) + 1500(payload)
+ * This does not include an additional 4 for the vlan field (802.1q).
+ */
+#define MAX_ETH_FRAME_SIZE 1518
+
+static const char *emc_reg_name(int regno)
+{
+#define REG(name) case REG_ ## name: return #name;
+ switch (regno) {
+ REG(CAMCMR)
+ REG(CAMEN)
+ REG(TXDLSA)
+ REG(RXDLSA)
+ REG(MCMDR)
+ REG(MIID)
+ REG(MIIDA)
+ REG(FFTCR)
+ REG(TSDR)
+ REG(RSDR)
+ REG(DMARFC)
+ REG(MIEN)
+ REG(MISTA)
+ REG(MGSTA)
+ REG(MPCNT)
+ REG(MRPC)
+ REG(MRPCC)
+ REG(MREPC)
+ REG(DMARFS)
+ REG(CTXDSA)
+ REG(CTXBSA)
+ REG(CRXDSA)
+ REG(CRXBSA)
+ case REG_CAMM_BASE + 0: return "CAM0M";
+ case REG_CAML_BASE + 0: return "CAM0L";
+ case REG_CAMM_BASE + 2 ... REG_CAMML_LAST:
+ /* Only CAM0 is supported, fold the others into something simple. */
+ if (regno & 1) {
+ return "CAM<n>L";
+ } else {
+ return "CAM<n>M";
+ }
+ default: return "UNKNOWN";
+ }
+#undef REG
+}
+
+static void emc_reset(NPCM7xxEMCState *emc)
+{
+ trace_npcm7xx_emc_reset(emc->emc_num);
+
+ memset(&emc->regs[0], 0, sizeof(emc->regs));
+
+ /* These regs have non-zero reset values. */
+ emc->regs[REG_TXDLSA] = 0xfffffffc;
+ emc->regs[REG_RXDLSA] = 0xfffffffc;
+ emc->regs[REG_MIIDA] = 0x00900000;
+ emc->regs[REG_FFTCR] = 0x0101;
+ emc->regs[REG_DMARFC] = 0x0800;
+ emc->regs[REG_MPCNT] = 0x7fff;
+
+ emc->tx_active = false;
+ emc->rx_active = false;
+}
+
+static void npcm7xx_emc_reset(DeviceState *dev)
+{
+ NPCM7xxEMCState *emc = NPCM7XX_EMC(dev);
+ emc_reset(emc);
+}
+
+static void emc_soft_reset(NPCM7xxEMCState *emc)
+{
+ /*
+ * The docs say at least MCMDR.{LBK,OPMOD} bits are not changed during a
+ * soft reset, but does not go into further detail. For now, KISS.
+ */
+ uint32_t mcmdr = emc->regs[REG_MCMDR];
+ emc_reset(emc);
+ emc->regs[REG_MCMDR] = mcmdr & (REG_MCMDR_LBK | REG_MCMDR_OPMOD);
+
+ qemu_set_irq(emc->tx_irq, 0);
+ qemu_set_irq(emc->rx_irq, 0);
+}
+
+static void emc_set_link(NetClientState *nc)
+{
+ /* Nothing to do yet. */
+}
+
+/* MISTA.TXINTR is the union of the individual bits with their enables. */
+static void emc_update_mista_txintr(NPCM7xxEMCState *emc)
+{
+ /* Only look at the bits we support. */
+ uint32_t mask = (REG_MISTA_TXBERR |
+ REG_MISTA_TDU |
+ REG_MISTA_TXCP);
+ if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & mask) {
+ emc->regs[REG_MISTA] |= REG_MISTA_TXINTR;
+ } else {
+ emc->regs[REG_MISTA] &= ~REG_MISTA_TXINTR;
+ }
+}
+
+/* MISTA.RXINTR is the union of the individual bits with their enables. */
+static void emc_update_mista_rxintr(NPCM7xxEMCState *emc)
+{
+ /* Only look at the bits we support. */
+ uint32_t mask = (REG_MISTA_RXBERR |
+ REG_MISTA_RDU |
+ REG_MISTA_RXGD);
+ if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & mask) {
+ emc->regs[REG_MISTA] |= REG_MISTA_RXINTR;
+ } else {
+ emc->regs[REG_MISTA] &= ~REG_MISTA_RXINTR;
+ }
+}
+
+/* N.B. emc_update_mista_txintr must have already been called. */
+static void emc_update_tx_irq(NPCM7xxEMCState *emc)
+{
+ int level = !!(emc->regs[REG_MISTA] &
+ emc->regs[REG_MIEN] &
+ REG_MISTA_TXINTR);
+ trace_npcm7xx_emc_update_tx_irq(level);
+ qemu_set_irq(emc->tx_irq, level);
+}
+
+/* N.B. emc_update_mista_rxintr must have already been called. */
+static void emc_update_rx_irq(NPCM7xxEMCState *emc)
+{
+ int level = !!(emc->regs[REG_MISTA] &
+ emc->regs[REG_MIEN] &
+ REG_MISTA_RXINTR);
+ trace_npcm7xx_emc_update_rx_irq(level);
+ qemu_set_irq(emc->rx_irq, level);
+}
+
+/* Update IRQ states due to changes in MIEN,MISTA. */
+static void emc_update_irq_from_reg_change(NPCM7xxEMCState *emc)
+{
+ emc_update_mista_txintr(emc);
+ emc_update_tx_irq(emc);
+
+ emc_update_mista_rxintr(emc);
+ emc_update_rx_irq(emc);
+}
+
+static int emc_read_tx_desc(dma_addr_t addr, NPCM7xxEMCTxDesc *desc)
+{
+ if (dma_memory_read(&address_space_memory, addr, desc, sizeof(*desc))) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to read descriptor @ 0x%"
+ HWADDR_PRIx "\n", __func__, addr);
+ return -1;
+ }
+ desc->flags = le32_to_cpu(desc->flags);
+ desc->txbsa = le32_to_cpu(desc->txbsa);
+ desc->status_and_length = le32_to_cpu(desc->status_and_length);
+ desc->ntxdsa = le32_to_cpu(desc->ntxdsa);
+ return 0;
+}
+
+static int emc_write_tx_desc(const NPCM7xxEMCTxDesc *desc, dma_addr_t addr)
+{
+ NPCM7xxEMCTxDesc le_desc;
+
+ le_desc.flags = cpu_to_le32(desc->flags);
+ le_desc.txbsa = cpu_to_le32(desc->txbsa);
+ le_desc.status_and_length = cpu_to_le32(desc->status_and_length);
+ le_desc.ntxdsa = cpu_to_le32(desc->ntxdsa);
+ if (dma_memory_write(&address_space_memory, addr, &le_desc,
+ sizeof(le_desc))) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to write descriptor @ 0x%"
+ HWADDR_PRIx "\n", __func__, addr);
+ return -1;
+ }
+ return 0;
+}
+
+static int emc_read_rx_desc(dma_addr_t addr, NPCM7xxEMCRxDesc *desc)
+{
+ if (dma_memory_read(&address_space_memory, addr, desc, sizeof(*desc))) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to read descriptor @ 0x%"
+ HWADDR_PRIx "\n", __func__, addr);
+ return -1;
+ }
+ desc->status_and_length = le32_to_cpu(desc->status_and_length);
+ desc->rxbsa = le32_to_cpu(desc->rxbsa);
+ desc->reserved = le32_to_cpu(desc->reserved);
+ desc->nrxdsa = le32_to_cpu(desc->nrxdsa);
+ return 0;
+}
+
+static int emc_write_rx_desc(const NPCM7xxEMCRxDesc *desc, dma_addr_t addr)
+{
+ NPCM7xxEMCRxDesc le_desc;
+
+ le_desc.status_and_length = cpu_to_le32(desc->status_and_length);
+ le_desc.rxbsa = cpu_to_le32(desc->rxbsa);
+ le_desc.reserved = cpu_to_le32(desc->reserved);
+ le_desc.nrxdsa = cpu_to_le32(desc->nrxdsa);
+ if (dma_memory_write(&address_space_memory, addr, &le_desc,
+ sizeof(le_desc))) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to write descriptor @ 0x%"
+ HWADDR_PRIx "\n", __func__, addr);
+ return -1;
+ }
+ return 0;
+}
+
+static void emc_set_mista(NPCM7xxEMCState *emc, uint32_t flags)
+{
+ trace_npcm7xx_emc_set_mista(flags);
+ emc->regs[REG_MISTA] |= flags;
+ if (extract32(flags, 16, 16)) {
+ emc_update_mista_txintr(emc);
+ }
+ if (extract32(flags, 0, 16)) {
+ emc_update_mista_rxintr(emc);
+ }
+}
+
+static void emc_halt_tx(NPCM7xxEMCState *emc, uint32_t mista_flag)
+{
+ emc->tx_active = false;
+ emc_set_mista(emc, mista_flag);
+}
+
+static void emc_halt_rx(NPCM7xxEMCState *emc, uint32_t mista_flag)
+{
+ emc->rx_active = false;
+ emc_set_mista(emc, mista_flag);
+}
+
+static void emc_set_next_tx_descriptor(NPCM7xxEMCState *emc,
+ const NPCM7xxEMCTxDesc *tx_desc,
+ uint32_t desc_addr)
+{
+ /* Update the current descriptor, if only to reset the owner flag. */
+ if (emc_write_tx_desc(tx_desc, desc_addr)) {
+ /*
+ * We just read it so this shouldn't generally happen.
+ * Error already reported.
+ */
+ emc_set_mista(emc, REG_MISTA_TXBERR);
+ }
+ emc->regs[REG_CTXDSA] = TX_DESC_NTXDSA(tx_desc->ntxdsa);
+}
+
+static void emc_set_next_rx_descriptor(NPCM7xxEMCState *emc,
+ const NPCM7xxEMCRxDesc *rx_desc,
+ uint32_t desc_addr)
+{
+ /* Update the current descriptor, if only to reset the owner flag. */
+ if (emc_write_rx_desc(rx_desc, desc_addr)) {
+ /*
+ * We just read it so this shouldn't generally happen.
+ * Error already reported.
+ */
+ emc_set_mista(emc, REG_MISTA_RXBERR);
+ }
+ emc->regs[REG_CRXDSA] = RX_DESC_NRXDSA(rx_desc->nrxdsa);
+}
+
+static void emc_try_send_next_packet(NPCM7xxEMCState *emc)
+{
+ /* Working buffer for sending out packets. Most packets fit in this. */
+#define TX_BUFFER_SIZE 2048
+ uint8_t tx_send_buffer[TX_BUFFER_SIZE];
+ uint32_t desc_addr = TX_DESC_NTXDSA(emc->regs[REG_CTXDSA]);
+ NPCM7xxEMCTxDesc tx_desc;
+ uint32_t next_buf_addr, length;
+ uint8_t *buf;
+ g_autofree uint8_t *malloced_buf = NULL;
+
+ if (emc_read_tx_desc(desc_addr, &tx_desc)) {
+ /* Error reading descriptor, already reported. */
+ emc_halt_tx(emc, REG_MISTA_TXBERR);
+ emc_update_tx_irq(emc);
+ return;
+ }
+
+ /* Nothing we can do if we don't own the descriptor. */
+ if (!(tx_desc.flags & TX_DESC_FLAG_OWNER_MASK)) {
+ trace_npcm7xx_emc_cpu_owned_desc(desc_addr);
+ emc_halt_tx(emc, REG_MISTA_TDU);
+ emc_update_tx_irq(emc);
+ return;
+ }
+
+ /* Give the descriptor back regardless of what happens. */
+ tx_desc.flags &= ~TX_DESC_FLAG_OWNER_MASK;
+ tx_desc.status_and_length &= 0xffff;
+
+ /*
+ * Despite the h/w documentation saying the tx buffer is word aligned,
+ * the linux driver does not word align the buffer. There is value in not
+ * aligning the buffer: See the description of NET_IP_ALIGN in linux
+ * kernel sources.
+ */
+ next_buf_addr = tx_desc.txbsa;
+ emc->regs[REG_CTXBSA] = next_buf_addr;
+ length = TX_DESC_PKT_LEN(tx_desc.status_and_length);
+ buf = &tx_send_buffer[0];
+
+ if (length > sizeof(tx_send_buffer)) {
+ malloced_buf = g_malloc(length);
+ buf = malloced_buf;
+ }
+
+ if (dma_memory_read(&address_space_memory, next_buf_addr, buf, length)) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to read packet @ 0x%x\n",
+ __func__, next_buf_addr);
+ emc_set_mista(emc, REG_MISTA_TXBERR);
+ emc_set_next_tx_descriptor(emc, &tx_desc, desc_addr);
+ emc_update_tx_irq(emc);
+ trace_npcm7xx_emc_tx_done(emc->regs[REG_CTXDSA]);
+ return;
+ }
+
+ if ((tx_desc.flags & TX_DESC_FLAG_PADEN) && (length < MIN_PACKET_LENGTH)) {
+ memset(buf + length, 0, MIN_PACKET_LENGTH - length);
+ length = MIN_PACKET_LENGTH;
+ }
+
+ /* N.B. emc_receive can get called here. */
+ qemu_send_packet(qemu_get_queue(emc->nic), buf, length);
+ trace_npcm7xx_emc_sent_packet(length);
+
+ tx_desc.status_and_length |= TX_DESC_STATUS_TXCP;
+ if (tx_desc.flags & TX_DESC_FLAG_INTEN) {
+ emc_set_mista(emc, REG_MISTA_TXCP);
+ }
+ if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & REG_MISTA_TXINTR) {
+ tx_desc.status_and_length |= TX_DESC_STATUS_TXINTR;
+ }
+
+ emc_set_next_tx_descriptor(emc, &tx_desc, desc_addr);
+ emc_update_tx_irq(emc);
+ trace_npcm7xx_emc_tx_done(emc->regs[REG_CTXDSA]);
+}
+
+static bool emc_can_receive(NetClientState *nc)
+{
+ NPCM7xxEMCState *emc = NPCM7XX_EMC(qemu_get_nic_opaque(nc));
+
+ bool can_receive = emc->rx_active;
+ trace_npcm7xx_emc_can_receive(can_receive);
+ return can_receive;
+}
+
+/* If result is false then *fail_reason contains the reason. */
+static bool emc_receive_filter1(NPCM7xxEMCState *emc, const uint8_t *buf,
+ size_t len, const char **fail_reason)
+{
+ eth_pkt_types_e pkt_type = get_eth_packet_type(PKT_GET_ETH_HDR(buf));
+
+ switch (pkt_type) {
+ case ETH_PKT_BCAST:
+ if (emc->regs[REG_CAMCMR] & REG_CAMCMR_CCAM) {
+ return true;
+ } else {
+ *fail_reason = "Broadcast packet disabled";
+ return !!(emc->regs[REG_CAMCMR] & REG_CAMCMR_ABP);
+ }
+ case ETH_PKT_MCAST:
+ if (emc->regs[REG_CAMCMR] & REG_CAMCMR_CCAM) {
+ return true;
+ } else {
+ *fail_reason = "Multicast packet disabled";
+ return !!(emc->regs[REG_CAMCMR] & REG_CAMCMR_AMP);
+ }
+ case ETH_PKT_UCAST: {
+ bool matches;
+ if (emc->regs[REG_CAMCMR] & REG_CAMCMR_AUP) {
+ return true;
+ }
+ matches = ((emc->regs[REG_CAMCMR] & REG_CAMCMR_ECMP) &&
+ /* We only support one CAM register, CAM0. */
+ (emc->regs[REG_CAMEN] & (1 << 0)) &&
+ memcmp(buf, emc->conf.macaddr.a, ETH_ALEN) == 0);
+ if (emc->regs[REG_CAMCMR] & REG_CAMCMR_CCAM) {
+ *fail_reason = "MACADDR matched, comparison complemented";
+ return !matches;
+ } else {
+ *fail_reason = "MACADDR didn't match";
+ return matches;
+ }
+ }
+ default:
+ g_assert_not_reached();
+ }
+}
+
+static bool emc_receive_filter(NPCM7xxEMCState *emc, const uint8_t *buf,
+ size_t len)
+{
+ const char *fail_reason = NULL;
+ bool ok = emc_receive_filter1(emc, buf, len, &fail_reason);
+ if (!ok) {
+ trace_npcm7xx_emc_packet_filtered_out(fail_reason);
+ }
+ return ok;
+}
+
+static ssize_t emc_receive(NetClientState *nc, const uint8_t *buf, size_t len1)
+{
+ NPCM7xxEMCState *emc = NPCM7XX_EMC(qemu_get_nic_opaque(nc));
+ const uint32_t len = len1;
+ size_t max_frame_len;
+ bool long_frame;
+ uint32_t desc_addr;
+ NPCM7xxEMCRxDesc rx_desc;
+ uint32_t crc;
+ uint8_t *crc_ptr;
+ uint32_t buf_addr;
+
+ trace_npcm7xx_emc_receiving_packet(len);
+
+ if (!emc_can_receive(nc)) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Unexpected packet\n", __func__);
+ return -1;
+ }
+
+ if (len < ETH_HLEN ||
+ /* Defensive programming: drop unsupportable large packets. */
+ len > 0xffff - CRC_LENGTH) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Dropped frame of %u bytes\n",
+ __func__, len);
+ return len;
+ }
+
+ /*
+ * DENI is set if EMC received the Length/Type field of the incoming
+ * packet, so it will be set regardless of what happens next.
+ */
+ emc_set_mista(emc, REG_MISTA_DENI);
+
+ if (!emc_receive_filter(emc, buf, len)) {
+ emc_update_rx_irq(emc);
+ return len;
+ }
+
+ /* Huge frames (> DMARFC) are dropped. */
+ max_frame_len = REG_DMARFC_RXMS(emc->regs[REG_DMARFC]);
+ if (len + CRC_LENGTH > max_frame_len) {
+ trace_npcm7xx_emc_packet_dropped(len);
+ emc_set_mista(emc, REG_MISTA_DFOI);
+ emc_update_rx_irq(emc);
+ return len;
+ }
+
+ /*
+ * Long Frames (> MAX_ETH_FRAME_SIZE) are also dropped, unless MCMDR.ALP
+ * is set.
+ */
+ long_frame = false;
+ if (len + CRC_LENGTH > MAX_ETH_FRAME_SIZE) {
+ if (emc->regs[REG_MCMDR] & REG_MCMDR_ALP) {
+ long_frame = true;
+ } else {
+ trace_npcm7xx_emc_packet_dropped(len);
+ emc_set_mista(emc, REG_MISTA_PTLE);
+ emc_update_rx_irq(emc);
+ return len;
+ }
+ }
+
+ desc_addr = RX_DESC_NRXDSA(emc->regs[REG_CRXDSA]);
+ if (emc_read_rx_desc(desc_addr, &rx_desc)) {
+ /* Error reading descriptor, already reported. */
+ emc_halt_rx(emc, REG_MISTA_RXBERR);
+ emc_update_rx_irq(emc);
+ return len;
+ }
+
+ /* Nothing we can do if we don't own the descriptor. */
+ if (!(rx_desc.status_and_length & RX_DESC_STATUS_OWNER_MASK)) {
+ trace_npcm7xx_emc_cpu_owned_desc(desc_addr);
+ emc_halt_rx(emc, REG_MISTA_RDU);
+ emc_update_rx_irq(emc);
+ return len;
+ }
+
+ crc = 0;
+ crc_ptr = (uint8_t *) &crc;
+ if (!(emc->regs[REG_MCMDR] & REG_MCMDR_SPCRC)) {
+ crc = cpu_to_be32(crc32(~0, buf, len));
+ }
+
+ /* Give the descriptor back regardless of what happens. */
+ rx_desc.status_and_length &= ~RX_DESC_STATUS_OWNER_MASK;
+
+ buf_addr = rx_desc.rxbsa;
+ emc->regs[REG_CRXBSA] = buf_addr;
+ if (dma_memory_write(&address_space_memory, buf_addr, buf, len) ||
+ (!(emc->regs[REG_MCMDR] & REG_MCMDR_SPCRC) &&
+ dma_memory_write(&address_space_memory, buf_addr + len, crc_ptr,
+ 4))) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Bus error writing packet\n",
+ __func__);
+ emc_set_mista(emc, REG_MISTA_RXBERR);
+ emc_set_next_rx_descriptor(emc, &rx_desc, desc_addr);
+ emc_update_rx_irq(emc);
+ trace_npcm7xx_emc_rx_done(emc->regs[REG_CRXDSA]);
+ return len;
+ }
+
+ trace_npcm7xx_emc_received_packet(len);
+
+ /* Note: We've already verified len+4 <= 0xffff. */
+ rx_desc.status_and_length = len;
+ if (!(emc->regs[REG_MCMDR] & REG_MCMDR_SPCRC)) {
+ rx_desc.status_and_length += 4;
+ }
+ rx_desc.status_and_length |= RX_DESC_STATUS_RXGD;
+ emc_set_mista(emc, REG_MISTA_RXGD);
+
+ if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & REG_MISTA_RXINTR) {
+ rx_desc.status_and_length |= RX_DESC_STATUS_RXINTR;
+ }
+ if (long_frame) {
+ rx_desc.status_and_length |= RX_DESC_STATUS_PTLE;
+ }
+
+ emc_set_next_rx_descriptor(emc, &rx_desc, desc_addr);
+ emc_update_rx_irq(emc);
+ trace_npcm7xx_emc_rx_done(emc->regs[REG_CRXDSA]);
+ return len;
+}
+
+static void emc_try_receive_next_packet(NPCM7xxEMCState *emc)
+{
+ if (emc_can_receive(qemu_get_queue(emc->nic))) {
+ qemu_flush_queued_packets(qemu_get_queue(emc->nic));
+ }
+}
+
+static uint64_t npcm7xx_emc_read(void *opaque, hwaddr offset, unsigned size)
+{
+ NPCM7xxEMCState *emc = opaque;
+ uint32_t reg = offset / sizeof(uint32_t);
+ uint32_t result;
+
+ if (reg >= NPCM7XX_NUM_EMC_REGS) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Invalid offset 0x%04" HWADDR_PRIx "\n",
+ __func__, offset);
+ return 0;
+ }
+
+ switch (reg) {
+ case REG_MIID:
+ /*
+ * We don't implement MII. For determinism, always return zero as
+ * writes record the last value written for debugging purposes.
+ */
+ qemu_log_mask(LOG_UNIMP, "%s: Read of MIID, returning 0\n", __func__);
+ result = 0;
+ break;
+ case REG_TSDR:
+ case REG_RSDR:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Read of write-only reg, %s/%d\n",
+ __func__, emc_reg_name(reg), reg);
+ return 0;
+ default:
+ result = emc->regs[reg];
+ break;
+ }
+
+ trace_npcm7xx_emc_reg_read(emc->emc_num, result, emc_reg_name(reg), reg);
+ return result;
+}
+
+static void npcm7xx_emc_write(void *opaque, hwaddr offset,
+ uint64_t v, unsigned size)
+{
+ NPCM7xxEMCState *emc = opaque;
+ uint32_t reg = offset / sizeof(uint32_t);
+ uint32_t value = v;
+
+ g_assert(size == sizeof(uint32_t));
+
+ if (reg >= NPCM7XX_NUM_EMC_REGS) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Invalid offset 0x%04" HWADDR_PRIx "\n",
+ __func__, offset);
+ return;
+ }
+
+ trace_npcm7xx_emc_reg_write(emc->emc_num, emc_reg_name(reg), reg, value);
+
+ switch (reg) {
+ case REG_CAMCMR:
+ emc->regs[reg] = value;
+ break;
+ case REG_CAMEN:
+ /* Only CAM0 is supported, don't pretend otherwise. */
+ if (value & ~1) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Only CAM0 is supported, cannot enable others"
+ ": 0x%x\n",
+ __func__, value);
+ }
+ emc->regs[reg] = value & 1;
+ break;
+ case REG_CAMM_BASE + 0:
+ emc->regs[reg] = value;
+ emc->conf.macaddr.a[0] = value >> 24;
+ emc->conf.macaddr.a[1] = value >> 16;
+ emc->conf.macaddr.a[2] = value >> 8;
+ emc->conf.macaddr.a[3] = value >> 0;
+ break;
+ case REG_CAML_BASE + 0:
+ emc->regs[reg] = value;
+ emc->conf.macaddr.a[4] = value >> 24;
+ emc->conf.macaddr.a[5] = value >> 16;
+ break;
+ case REG_MCMDR: {
+ uint32_t prev;
+ if (value & REG_MCMDR_SWR) {
+ emc_soft_reset(emc);
+ /* On h/w the reset happens over multiple cycles. For now KISS. */
+ break;
+ }
+ prev = emc->regs[reg];
+ emc->regs[reg] = value;
+ /* Update tx state. */
+ if (!(prev & REG_MCMDR_TXON) &&
+ (value & REG_MCMDR_TXON)) {
+ emc->regs[REG_CTXDSA] = emc->regs[REG_TXDLSA];
+ /*
+ * Linux kernel turns TX on with CPU still holding descriptor,
+ * which suggests we should wait for a write to TSDR before trying
+ * to send a packet: so we don't send one here.
+ */
+ } else if ((prev & REG_MCMDR_TXON) &&
+ !(value & REG_MCMDR_TXON)) {
+ emc->regs[REG_MGSTA] |= REG_MGSTA_TXHA;
+ }
+ if (!(value & REG_MCMDR_TXON)) {
+ emc_halt_tx(emc, 0);
+ }
+ /* Update rx state. */
+ if (!(prev & REG_MCMDR_RXON) &&
+ (value & REG_MCMDR_RXON)) {
+ emc->regs[REG_CRXDSA] = emc->regs[REG_RXDLSA];
+ } else if ((prev & REG_MCMDR_RXON) &&
+ !(value & REG_MCMDR_RXON)) {
+ emc->regs[REG_MGSTA] |= REG_MGSTA_RXHA;
+ }
+ if (!(value & REG_MCMDR_RXON)) {
+ emc_halt_rx(emc, 0);
+ }
+ break;
+ }
+ case REG_TXDLSA:
+ case REG_RXDLSA:
+ case REG_DMARFC:
+ case REG_MIID:
+ emc->regs[reg] = value;
+ break;
+ case REG_MIEN:
+ emc->regs[reg] = value;
+ emc_update_irq_from_reg_change(emc);
+ break;
+ case REG_MISTA:
+ /* Clear the bits that have 1 in "value". */
+ emc->regs[reg] &= ~value;
+ emc_update_irq_from_reg_change(emc);
+ break;
+ case REG_MGSTA:
+ /* Clear the bits that have 1 in "value". */
+ emc->regs[reg] &= ~value;
+ break;
+ case REG_TSDR:
+ if (emc->regs[REG_MCMDR] & REG_MCMDR_TXON) {
+ emc->tx_active = true;
+ /* Keep trying to send packets until we run out. */
+ while (emc->tx_active) {
+ emc_try_send_next_packet(emc);
+ }
+ }
+ break;
+ case REG_RSDR:
+ if (emc->regs[REG_MCMDR] & REG_MCMDR_RXON) {
+ emc->rx_active = true;
+ emc_try_receive_next_packet(emc);
+ }
+ break;
+ case REG_MIIDA:
+ emc->regs[reg] = value & ~REG_MIIDA_BUSY;
+ break;
+ case REG_MRPC:
+ case REG_MRPCC:
+ case REG_MREPC:
+ case REG_CTXDSA:
+ case REG_CTXBSA:
+ case REG_CRXDSA:
+ case REG_CRXBSA:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Write to read-only reg %s/%d\n",
+ __func__, emc_reg_name(reg), reg);
+ break;
+ default:
+ qemu_log_mask(LOG_UNIMP, "%s: Write to unimplemented reg %s/%d\n",
+ __func__, emc_reg_name(reg), reg);
+ break;
+ }
+}
+
+static const struct MemoryRegionOps npcm7xx_emc_ops = {
+ .read = npcm7xx_emc_read,
+ .write = npcm7xx_emc_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ .unaligned = false,
+ },
+};
+
+static void emc_cleanup(NetClientState *nc)
+{
+ /* Nothing to do yet. */
+}
+
+static NetClientInfo net_npcm7xx_emc_info = {
+ .type = NET_CLIENT_DRIVER_NIC,
+ .size = sizeof(NICState),
+ .can_receive = emc_can_receive,
+ .receive = emc_receive,
+ .cleanup = emc_cleanup,
+ .link_status_changed = emc_set_link,
+};
+
+static void npcm7xx_emc_realize(DeviceState *dev, Error **errp)
+{
+ NPCM7xxEMCState *emc = NPCM7XX_EMC(dev);
+ SysBusDevice *sbd = SYS_BUS_DEVICE(emc);
+
+ memory_region_init_io(&emc->iomem, OBJECT(emc), &npcm7xx_emc_ops, emc,
+ TYPE_NPCM7XX_EMC, 4 * KiB);
+ sysbus_init_mmio(sbd, &emc->iomem);
+ sysbus_init_irq(sbd, &emc->tx_irq);
+ sysbus_init_irq(sbd, &emc->rx_irq);
+
+ qemu_macaddr_default_if_unset(&emc->conf.macaddr);
+ emc->nic = qemu_new_nic(&net_npcm7xx_emc_info, &emc->conf,
+ object_get_typename(OBJECT(dev)), dev->id, emc);
+ qemu_format_nic_info_str(qemu_get_queue(emc->nic), emc->conf.macaddr.a);
+}
+
+static void npcm7xx_emc_unrealize(DeviceState *dev)
+{
+ NPCM7xxEMCState *emc = NPCM7XX_EMC(dev);
+
+ qemu_del_nic(emc->nic);
+}
+
+static const VMStateDescription vmstate_npcm7xx_emc = {
+ .name = TYPE_NPCM7XX_EMC,
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(emc_num, NPCM7xxEMCState),
+ VMSTATE_UINT32_ARRAY(regs, NPCM7xxEMCState, NPCM7XX_NUM_EMC_REGS),
+ VMSTATE_BOOL(tx_active, NPCM7xxEMCState),
+ VMSTATE_BOOL(rx_active, NPCM7xxEMCState),
+ VMSTATE_END_OF_LIST(),
+ },
+};
+
+static Property npcm7xx_emc_properties[] = {
+ DEFINE_NIC_PROPERTIES(NPCM7xxEMCState, conf),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void npcm7xx_emc_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
+ dc->desc = "NPCM7xx EMC Controller";
+ dc->realize = npcm7xx_emc_realize;
+ dc->unrealize = npcm7xx_emc_unrealize;
+ dc->reset = npcm7xx_emc_reset;
+ dc->vmsd = &vmstate_npcm7xx_emc;
+ device_class_set_props(dc, npcm7xx_emc_properties);
+}
+
+static const TypeInfo npcm7xx_emc_info = {
+ .name = TYPE_NPCM7XX_EMC,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(NPCM7xxEMCState),
+ .class_init = npcm7xx_emc_class_init,
+};
+
+static void npcm7xx_emc_register_type(void)
+{
+ type_register_static(&npcm7xx_emc_info);
+}
+
+type_init(npcm7xx_emc_register_type)
diff --git a/hw/net/trace-events b/hw/net/trace-events
index 5db45456d9..baf25ffa7e 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -429,3 +429,20 @@ imx_fec_receive_last(int last) "rx frame flags 0x%04x"
imx_enet_receive(size_t size) "len %zu"
imx_enet_receive_len(uint64_t addr, int len) "rx_bd 0x%"PRIx64" length %d"
imx_enet_receive_last(int last) "rx frame flags 0x%04x"
+
+# npcm7xx_emc.c
+npcm7xx_emc_reset(int emc_num) "Resetting emc%d"
+npcm7xx_emc_update_tx_irq(int level) "Setting tx irq to %d"
+npcm7xx_emc_update_rx_irq(int level) "Setting rx irq to %d"
+npcm7xx_emc_set_mista(uint32_t flags) "ORing 0x%x into MISTA"
+npcm7xx_emc_cpu_owned_desc(uint32_t addr) "Can't process cpu-owned descriptor @0x%x"
+npcm7xx_emc_sent_packet(uint32_t len) "Sent %u byte packet"
+npcm7xx_emc_tx_done(uint32_t ctxdsa) "TX done, CTXDSA=0x%x"
+npcm7xx_emc_can_receive(int can_receive) "Can receive: %d"
+npcm7xx_emc_packet_filtered_out(const char* fail_reason) "Packet filtered out: %s"
+npcm7xx_emc_packet_dropped(uint32_t len) "%u byte packet dropped"
+npcm7xx_emc_receiving_packet(uint32_t len) "Receiving %u byte packet"
+npcm7xx_emc_received_packet(uint32_t len) "Received %u byte packet"
+npcm7xx_emc_rx_done(uint32_t crxdsa) "RX done, CRXDSA=0x%x"
+npcm7xx_emc_reg_read(int emc_num, uint32_t result, const char *name, int regno) "emc%d: 0x%x = reg[%s/%d]"
+npcm7xx_emc_reg_write(int emc_num, const char *name, int regno, uint32_t value) "emc%d: reg[%s/%d] = 0x%x"
diff --git a/include/hw/net/npcm7xx_emc.h b/include/hw/net/npcm7xx_emc.h
new file mode 100644
index 0000000000..eac7f29816
--- /dev/null
+++ b/include/hw/net/npcm7xx_emc.h
@@ -0,0 +1,286 @@
+/*
+ * Nuvoton NPCM7xx EMC Module
+ *
+ * Copyright 2020 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#ifndef NPCM7XX_EMC_H
+#define NPCM7XX_EMC_H
+
+#include "hw/irq.h"
+#include "hw/sysbus.h"
+#include "net/net.h"
+
+/* 32-bit register indices. */
+enum NPCM7xxPWMRegister {
+ /* Control registers. */
+ REG_CAMCMR,
+ REG_CAMEN,
+
+ /* There are 16 CAMn[ML] registers. */
+ REG_CAMM_BASE,
+ REG_CAML_BASE,
+ REG_CAMML_LAST = 0x21,
+
+ REG_TXDLSA = 0x22,
+ REG_RXDLSA,
+ REG_MCMDR,
+ REG_MIID,
+ REG_MIIDA,
+ REG_FFTCR,
+ REG_TSDR,
+ REG_RSDR,
+ REG_DMARFC,
+ REG_MIEN,
+
+ /* Status registers. */
+ REG_MISTA,
+ REG_MGSTA,
+ REG_MPCNT,
+ REG_MRPC,
+ REG_MRPCC,
+ REG_MREPC,
+ REG_DMARFS,
+ REG_CTXDSA,
+ REG_CTXBSA,
+ REG_CRXDSA,
+ REG_CRXBSA,
+
+ NPCM7XX_NUM_EMC_REGS,
+};
+
+/* REG_CAMCMR fields */
+/* Enable CAM Compare */
+#define REG_CAMCMR_ECMP (1 << 4)
+/* Complement CAM Compare */
+#define REG_CAMCMR_CCAM (1 << 3)
+/* Accept Broadcast Packet */
+#define REG_CAMCMR_ABP (1 << 2)
+/* Accept Multicast Packet */
+#define REG_CAMCMR_AMP (1 << 1)
+/* Accept Unicast Packet */
+#define REG_CAMCMR_AUP (1 << 0)
+
+/* REG_MCMDR fields */
+/* Software Reset */
+#define REG_MCMDR_SWR (1 << 24)
+/* Internal Loopback Select */
+#define REG_MCMDR_LBK (1 << 21)
+/* Operation Mode Select */
+#define REG_MCMDR_OPMOD (1 << 20)
+/* Enable MDC Clock Generation */
+#define REG_MCMDR_ENMDC (1 << 19)
+/* Full-Duplex Mode Select */
+#define REG_MCMDR_FDUP (1 << 18)
+/* Enable SQE Checking */
+#define REG_MCMDR_ENSEQ (1 << 17)
+/* Send PAUSE Frame */
+#define REG_MCMDR_SDPZ (1 << 16)
+/* No Defer */
+#define REG_MCMDR_NDEF (1 << 9)
+/* Frame Transmission On */
+#define REG_MCMDR_TXON (1 << 8)
+/* Strip CRC Checksum */
+#define REG_MCMDR_SPCRC (1 << 5)
+/* Accept CRC Error Packet */
+#define REG_MCMDR_AEP (1 << 4)
+/* Accept Control Packet */
+#define REG_MCMDR_ACP (1 << 3)
+/* Accept Runt Packet */
+#define REG_MCMDR_ARP (1 << 2)
+/* Accept Long Packet */
+#define REG_MCMDR_ALP (1 << 1)
+/* Frame Reception On */
+#define REG_MCMDR_RXON (1 << 0)
+
+/* REG_MIEN fields */
+/* Enable Transmit Descriptor Unavailable Interrupt */
+#define REG_MIEN_ENTDU (1 << 23)
+/* Enable Transmit Completion Interrupt */
+#define REG_MIEN_ENTXCP (1 << 18)
+/* Enable Transmit Interrupt */
+#define REG_MIEN_ENTXINTR (1 << 16)
+/* Enable Receive Descriptor Unavailable Interrupt */
+#define REG_MIEN_ENRDU (1 << 10)
+/* Enable Receive Good Interrupt */
+#define REG_MIEN_ENRXGD (1 << 4)
+/* Enable Receive Interrupt */
+#define REG_MIEN_ENRXINTR (1 << 0)
+
+/* REG_MISTA fields */
+/* TODO: Add error fields and support simulated errors? */
+/* Transmit Bus Error Interrupt */
+#define REG_MISTA_TXBERR (1 << 24)
+/* Transmit Descriptor Unavailable Interrupt */
+#define REG_MISTA_TDU (1 << 23)
+/* Transmit Completion Interrupt */
+#define REG_MISTA_TXCP (1 << 18)
+/* Transmit Interrupt */
+#define REG_MISTA_TXINTR (1 << 16)
+/* Receive Bus Error Interrupt */
+#define REG_MISTA_RXBERR (1 << 11)
+/* Receive Descriptor Unavailable Interrupt */
+#define REG_MISTA_RDU (1 << 10)
+/* DMA Early Notification Interrupt */
+#define REG_MISTA_DENI (1 << 9)
+/* Maximum Frame Length Interrupt */
+#define REG_MISTA_DFOI (1 << 8)
+/* Receive Good Interrupt */
+#define REG_MISTA_RXGD (1 << 4)
+/* Packet Too Long Interrupt */
+#define REG_MISTA_PTLE (1 << 3)
+/* Receive Interrupt */
+#define REG_MISTA_RXINTR (1 << 0)
+
+/* REG_MGSTA fields */
+/* Transmission Halted */
+#define REG_MGSTA_TXHA (1 << 11)
+/* Receive Halted */
+#define REG_MGSTA_RXHA (1 << 11)
+
+/* REG_DMARFC fields */
+/* Maximum Receive Frame Length */
+#define REG_DMARFC_RXMS(word) extract32((word), 0, 16)
+
+/* REG MIIDA fields */
+/* Busy Bit */
+#define REG_MIIDA_BUSY (1 << 17)
+
+/* Transmit and receive descriptors */
+typedef struct NPCM7xxEMCTxDesc NPCM7xxEMCTxDesc;
+typedef struct NPCM7xxEMCRxDesc NPCM7xxEMCRxDesc;
+
+struct NPCM7xxEMCTxDesc {
+ uint32_t flags;
+ uint32_t txbsa;
+ uint32_t status_and_length;
+ uint32_t ntxdsa;
+};
+
+struct NPCM7xxEMCRxDesc {
+ uint32_t status_and_length;
+ uint32_t rxbsa;
+ uint32_t reserved;
+ uint32_t nrxdsa;
+};
+
+/* NPCM7xxEMCTxDesc.flags values */
+/* Owner: 0 = cpu, 1 = emc */
+#define TX_DESC_FLAG_OWNER_MASK (1 << 31)
+/* Transmit interrupt enable */
+#define TX_DESC_FLAG_INTEN (1 << 2)
+/* CRC append */
+#define TX_DESC_FLAG_CRCAPP (1 << 1)
+/* Padding enable */
+#define TX_DESC_FLAG_PADEN (1 << 0)
+
+/* NPCM7xxEMCTxDesc.status_and_length values */
+/* Collision count */
+#define TX_DESC_STATUS_CCNT_SHIFT 28
+#define TX_DESC_STATUS_CCNT_BITSIZE 4
+/* SQE error */
+#define TX_DESC_STATUS_SQE (1 << 26)
+/* Transmission paused */
+#define TX_DESC_STATUS_PAU (1 << 25)
+/* P transmission halted */
+#define TX_DESC_STATUS_TXHA (1 << 24)
+/* Late collision */
+#define TX_DESC_STATUS_LC (1 << 23)
+/* Transmission abort */
+#define TX_DESC_STATUS_TXABT (1 << 22)
+/* No carrier sense */
+#define TX_DESC_STATUS_NCS (1 << 21)
+/* Defer exceed */
+#define TX_DESC_STATUS_EXDEF (1 << 20)
+/* Transmission complete */
+#define TX_DESC_STATUS_TXCP (1 << 19)
+/* Transmission deferred */
+#define TX_DESC_STATUS_DEF (1 << 17)
+/* Transmit interrupt */
+#define TX_DESC_STATUS_TXINTR (1 << 16)
+
+#define TX_DESC_PKT_LEN(word) extract32((word), 0, 16)
+
+/* Transmit buffer start address */
+#define TX_DESC_TXBSA(word) ((uint32_t) (word) & ~3u)
+
+/* Next transmit descriptor start address */
+#define TX_DESC_NTXDSA(word) ((uint32_t) (word) & ~3u)
+
+/* NPCM7xxEMCRxDesc.status_and_length values */
+/* Owner: 0b00 = cpu, 0b01 = undefined, 0b10 = emc, 0b11 = undefined */
+#define RX_DESC_STATUS_OWNER_SHIFT 30
+#define RX_DESC_STATUS_OWNER_BITSIZE 2
+#define RX_DESC_STATUS_OWNER_MASK (3 << RX_DESC_STATUS_OWNER_SHIFT)
+/* Runt packet */
+#define RX_DESC_STATUS_RP (1 << 22)
+/* Alignment error */
+#define RX_DESC_STATUS_ALIE (1 << 21)
+/* Frame reception complete */
+#define RX_DESC_STATUS_RXGD (1 << 20)
+/* Packet too long */
+#define RX_DESC_STATUS_PTLE (1 << 19)
+/* CRC error */
+#define RX_DESC_STATUS_CRCE (1 << 17)
+/* Receive interrupt */
+#define RX_DESC_STATUS_RXINTR (1 << 16)
+
+#define RX_DESC_PKT_LEN(word) extract32((word), 0, 16)
+
+/* Receive buffer start address */
+#define RX_DESC_RXBSA(word) ((uint32_t) (word) & ~3u)
+
+/* Next receive descriptor start address */
+#define RX_DESC_NRXDSA(word) ((uint32_t) (word) & ~3u)
+
+/* Minimum packet length, when TX_DESC_FLAG_PADEN is set. */
+#define MIN_PACKET_LENGTH 64
+
+struct NPCM7xxEMCState {
+ /*< private >*/
+ SysBusDevice parent;
+ /*< public >*/
+
+ MemoryRegion iomem;
+
+ qemu_irq tx_irq;
+ qemu_irq rx_irq;
+
+ NICState *nic;
+ NICConf conf;
+
+ /* 0 or 1, for log messages */
+ uint8_t emc_num;
+
+ uint32_t regs[NPCM7XX_NUM_EMC_REGS];
+
+ /*
+ * tx is active. Set to true by TSDR and then switches off when out of
+ * descriptors. If the TXON bit in REG_MCMDR is off then this is off.
+ */
+ bool tx_active;
+
+ /*
+ * rx is active. Set to true by RSDR and then switches off when out of
+ * descriptors. If the RXON bit in REG_MCMDR is off then this is off.
+ */
+ bool rx_active;
+};
+
+typedef struct NPCM7xxEMCState NPCM7xxEMCState;
+
+#define TYPE_NPCM7XX_EMC "npcm7xx-emc"
+#define NPCM7XX_EMC(obj) \
+ OBJECT_CHECK(NPCM7xxEMCState, (obj), TYPE_NPCM7XX_EMC)
+
+#endif /* NPCM7XX_EMC_H */
--
2.30.0.478.g8a0d178c01-goog
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH v3 3/3] tests/qtests: Add npcm7xx emc model test
2021-02-09 1:55 [PATCH v3 0/3] Add npcm7xx emc model Doug Evans via
2021-02-09 1:55 ` [PATCH v3 1/3] hw/net: " Doug Evans via
2021-02-09 1:55 ` [PATCH v3 2/3] hw/arm: " Doug Evans via
@ 2021-02-09 1:55 ` Doug Evans via
2021-02-11 11:34 ` [PATCH v3 0/3] Add npcm7xx emc model Peter Maydell
3 siblings, 0 replies; 7+ messages in thread
From: Doug Evans via @ 2021-02-09 1:55 UTC (permalink / raw)
To: qemu-devel; +Cc: Jason Wang, Peter Maydell, Hao Wu, Avi Fishman, Doug Evans
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Avi Fishman <avi.fishman@nuvoton.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Doug Evans <dje@google.com>
---
Differences from v2:
- remove use of C99 mixed decls/statements
tests/qtest/meson.build | 1 +
tests/qtest/npcm7xx_emc-test.c | 812 +++++++++++++++++++++++++++++++++
2 files changed, 813 insertions(+)
create mode 100644 tests/qtest/npcm7xx_emc-test.c
diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
index c83bc211b6..f7c369f3d5 100644
--- a/tests/qtest/meson.build
+++ b/tests/qtest/meson.build
@@ -136,6 +136,7 @@ qtests_sparc64 = \
qtests_npcm7xx = \
['npcm7xx_adc-test',
+ 'npcm7xx_emc-test',
'npcm7xx_gpio-test',
'npcm7xx_pwm-test',
'npcm7xx_rng-test',
diff --git a/tests/qtest/npcm7xx_emc-test.c b/tests/qtest/npcm7xx_emc-test.c
new file mode 100644
index 0000000000..95712dc3b5
--- /dev/null
+++ b/tests/qtest/npcm7xx_emc-test.c
@@ -0,0 +1,812 @@
+/*
+ * QTests for Nuvoton NPCM7xx EMC Modules.
+ *
+ * Copyright 2020 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "libqos/libqos.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qnum.h"
+#include "qemu/bitops.h"
+#include "qemu/iov.h"
+
+/* Name of the emc device. */
+#define TYPE_NPCM7XX_EMC "npcm7xx-emc"
+
+/* Timeout for various operations, in seconds. */
+#define TIMEOUT_SECONDS 10
+
+/* Address in memory of the descriptor. */
+#define DESC_ADDR (1 << 20) /* 1 MiB */
+
+/* Address in memory of the data packet. */
+#define DATA_ADDR (DESC_ADDR + 4096)
+
+#define CRC_LENGTH 4
+
+#define NUM_TX_DESCRIPTORS 3
+#define NUM_RX_DESCRIPTORS 2
+
+/* Size of tx,rx test buffers. */
+#define TX_DATA_LEN 64
+#define RX_DATA_LEN 64
+
+#define TX_STEP_COUNT 10000
+#define RX_STEP_COUNT 10000
+
+/* 32-bit register indices. */
+typedef enum NPCM7xxPWMRegister {
+ /* Control registers. */
+ REG_CAMCMR,
+ REG_CAMEN,
+
+ /* There are 16 CAMn[ML] registers. */
+ REG_CAMM_BASE,
+ REG_CAML_BASE,
+
+ REG_TXDLSA = 0x22,
+ REG_RXDLSA,
+ REG_MCMDR,
+ REG_MIID,
+ REG_MIIDA,
+ REG_FFTCR,
+ REG_TSDR,
+ REG_RSDR,
+ REG_DMARFC,
+ REG_MIEN,
+
+ /* Status registers. */
+ REG_MISTA,
+ REG_MGSTA,
+ REG_MPCNT,
+ REG_MRPC,
+ REG_MRPCC,
+ REG_MREPC,
+ REG_DMARFS,
+ REG_CTXDSA,
+ REG_CTXBSA,
+ REG_CRXDSA,
+ REG_CRXBSA,
+
+ NPCM7XX_NUM_EMC_REGS,
+} NPCM7xxPWMRegister;
+
+enum { NUM_CAMML_REGS = 16 };
+
+/* REG_CAMCMR fields */
+/* Enable CAM Compare */
+#define REG_CAMCMR_ECMP (1 << 4)
+/* Accept Unicast Packet */
+#define REG_CAMCMR_AUP (1 << 0)
+
+/* REG_MCMDR fields */
+/* Software Reset */
+#define REG_MCMDR_SWR (1 << 24)
+/* Frame Transmission On */
+#define REG_MCMDR_TXON (1 << 8)
+/* Accept Long Packet */
+#define REG_MCMDR_ALP (1 << 1)
+/* Frame Reception On */
+#define REG_MCMDR_RXON (1 << 0)
+
+/* REG_MIEN fields */
+/* Enable Transmit Completion Interrupt */
+#define REG_MIEN_ENTXCP (1 << 18)
+/* Enable Transmit Interrupt */
+#define REG_MIEN_ENTXINTR (1 << 16)
+/* Enable Receive Good Interrupt */
+#define REG_MIEN_ENRXGD (1 << 4)
+/* ENable Receive Interrupt */
+#define REG_MIEN_ENRXINTR (1 << 0)
+
+/* REG_MISTA fields */
+/* Transmit Bus Error Interrupt */
+#define REG_MISTA_TXBERR (1 << 24)
+/* Transmit Descriptor Unavailable Interrupt */
+#define REG_MISTA_TDU (1 << 23)
+/* Transmit Completion Interrupt */
+#define REG_MISTA_TXCP (1 << 18)
+/* Transmit Interrupt */
+#define REG_MISTA_TXINTR (1 << 16)
+/* Receive Bus Error Interrupt */
+#define REG_MISTA_RXBERR (1 << 11)
+/* Receive Descriptor Unavailable Interrupt */
+#define REG_MISTA_RDU (1 << 10)
+/* DMA Early Notification Interrupt */
+#define REG_MISTA_DENI (1 << 9)
+/* Maximum Frame Length Interrupt */
+#define REG_MISTA_DFOI (1 << 8)
+/* Receive Good Interrupt */
+#define REG_MISTA_RXGD (1 << 4)
+/* Packet Too Long Interrupt */
+#define REG_MISTA_PTLE (1 << 3)
+/* Receive Interrupt */
+#define REG_MISTA_RXINTR (1 << 0)
+
+typedef struct NPCM7xxEMCTxDesc NPCM7xxEMCTxDesc;
+typedef struct NPCM7xxEMCRxDesc NPCM7xxEMCRxDesc;
+
+struct NPCM7xxEMCTxDesc {
+ uint32_t flags;
+ uint32_t txbsa;
+ uint32_t status_and_length;
+ uint32_t ntxdsa;
+};
+
+struct NPCM7xxEMCRxDesc {
+ uint32_t status_and_length;
+ uint32_t rxbsa;
+ uint32_t reserved;
+ uint32_t nrxdsa;
+};
+
+/* NPCM7xxEMCTxDesc.flags values */
+/* Owner: 0 = cpu, 1 = emc */
+#define TX_DESC_FLAG_OWNER_MASK (1 << 31)
+/* Transmit interrupt enable */
+#define TX_DESC_FLAG_INTEN (1 << 2)
+
+/* NPCM7xxEMCTxDesc.status_and_length values */
+/* Transmission complete */
+#define TX_DESC_STATUS_TXCP (1 << 19)
+/* Transmit interrupt */
+#define TX_DESC_STATUS_TXINTR (1 << 16)
+
+/* NPCM7xxEMCRxDesc.status_and_length values */
+/* Owner: 0b00 = cpu, 0b10 = emc */
+#define RX_DESC_STATUS_OWNER_SHIFT 30
+#define RX_DESC_STATUS_OWNER_MASK 0xc0000000
+/* Frame Reception Complete */
+#define RX_DESC_STATUS_RXGD (1 << 20)
+/* Packet too long */
+#define RX_DESC_STATUS_PTLE (1 << 19)
+/* Receive Interrupt */
+#define RX_DESC_STATUS_RXINTR (1 << 16)
+
+#define RX_DESC_PKT_LEN(word) ((uint32_t) (word) & 0xffff)
+
+typedef struct EMCModule {
+ int rx_irq;
+ int tx_irq;
+ uint64_t base_addr;
+} EMCModule;
+
+typedef struct TestData {
+ const EMCModule *module;
+} TestData;
+
+static const EMCModule emc_module_list[] = {
+ {
+ .rx_irq = 15,
+ .tx_irq = 16,
+ .base_addr = 0xf0825000
+ },
+ {
+ .rx_irq = 114,
+ .tx_irq = 115,
+ .base_addr = 0xf0826000
+ }
+};
+
+/* Returns the index of the EMC module. */
+static int emc_module_index(const EMCModule *mod)
+{
+ ptrdiff_t diff = mod - emc_module_list;
+
+ g_assert_true(diff >= 0 && diff < ARRAY_SIZE(emc_module_list));
+
+ return diff;
+}
+
+static void packet_test_clear(void *sockets)
+{
+ int *test_sockets = sockets;
+
+ close(test_sockets[0]);
+ g_free(test_sockets);
+}
+
+static int *packet_test_init(int module_num, GString *cmd_line)
+{
+ int *test_sockets = g_new(int, 2);
+ int ret = socketpair(PF_UNIX, SOCK_STREAM, 0, test_sockets);
+ g_assert_cmpint(ret, != , -1);
+
+ /*
+ * KISS and use -nic. We specify two nics (both emc{0,1}) because there's
+ * currently no way to specify only emc1: The driver implicitly relies on
+ * emc[i] == nd_table[i].
+ */
+ if (module_num == 0) {
+ g_string_append_printf(cmd_line,
+ " -nic socket,fd=%d,model=" TYPE_NPCM7XX_EMC " "
+ " -nic user,model=" TYPE_NPCM7XX_EMC " ",
+ test_sockets[1]);
+ } else {
+ g_string_append_printf(cmd_line,
+ " -nic user,model=" TYPE_NPCM7XX_EMC " "
+ " -nic socket,fd=%d,model=" TYPE_NPCM7XX_EMC " ",
+ test_sockets[1]);
+ }
+
+ g_test_queue_destroy(packet_test_clear, test_sockets);
+ return test_sockets;
+}
+
+static uint32_t emc_read(QTestState *qts, const EMCModule *mod,
+ NPCM7xxPWMRegister regno)
+{
+ return qtest_readl(qts, mod->base_addr + regno * sizeof(uint32_t));
+}
+
+static void emc_write(QTestState *qts, const EMCModule *mod,
+ NPCM7xxPWMRegister regno, uint32_t value)
+{
+ qtest_writel(qts, mod->base_addr + regno * sizeof(uint32_t), value);
+}
+
+/*
+ * Reset the EMC module.
+ * The module must be reset before, e.g., TXDLSA,RXDLSA are changed.
+ */
+static bool emc_soft_reset(QTestState *qts, const EMCModule *mod)
+{
+ uint32_t val;
+ uint64_t end_time;
+
+ emc_write(qts, mod, REG_MCMDR, REG_MCMDR_SWR);
+
+ /*
+ * Wait for device to reset as the linux driver does.
+ * During reset the AHB reads 0 for all registers. So first wait for
+ * something that resets to non-zero, and then wait for SWR becoming 0.
+ */
+ end_time = g_get_monotonic_time() + TIMEOUT_SECONDS * G_TIME_SPAN_SECOND;
+
+ do {
+ qtest_clock_step(qts, 100);
+ val = emc_read(qts, mod, REG_FFTCR);
+ } while (val == 0 && g_get_monotonic_time() < end_time);
+ if (val != 0) {
+ do {
+ qtest_clock_step(qts, 100);
+ val = emc_read(qts, mod, REG_MCMDR);
+ if ((val & REG_MCMDR_SWR) == 0) {
+ /*
+ * N.B. The CAMs have been reset here, so macaddr matching of
+ * incoming packets will not work.
+ */
+ return true;
+ }
+ } while (g_get_monotonic_time() < end_time);
+ }
+
+ g_message("%s: Timeout expired", __func__);
+ return false;
+}
+
+/* Check emc registers are reset to default value. */
+static void test_init(gconstpointer test_data)
+{
+ const TestData *td = test_data;
+ const EMCModule *mod = td->module;
+ QTestState *qts = qtest_init("-machine quanta-gsj");
+ int i;
+
+#define CHECK_REG(regno, value) \
+ do { \
+ g_assert_cmphex(emc_read(qts, mod, (regno)), ==, (value)); \
+ } while (0)
+
+ CHECK_REG(REG_CAMCMR, 0);
+ CHECK_REG(REG_CAMEN, 0);
+ CHECK_REG(REG_TXDLSA, 0xfffffffc);
+ CHECK_REG(REG_RXDLSA, 0xfffffffc);
+ CHECK_REG(REG_MCMDR, 0);
+ CHECK_REG(REG_MIID, 0);
+ CHECK_REG(REG_MIIDA, 0x00900000);
+ CHECK_REG(REG_FFTCR, 0x0101);
+ CHECK_REG(REG_DMARFC, 0x0800);
+ CHECK_REG(REG_MIEN, 0);
+ CHECK_REG(REG_MISTA, 0);
+ CHECK_REG(REG_MGSTA, 0);
+ CHECK_REG(REG_MPCNT, 0x7fff);
+ CHECK_REG(REG_MRPC, 0);
+ CHECK_REG(REG_MRPCC, 0);
+ CHECK_REG(REG_MREPC, 0);
+ CHECK_REG(REG_DMARFS, 0);
+ CHECK_REG(REG_CTXDSA, 0);
+ CHECK_REG(REG_CTXBSA, 0);
+ CHECK_REG(REG_CRXDSA, 0);
+ CHECK_REG(REG_CRXBSA, 0);
+
+#undef CHECK_REG
+
+ for (i = 0; i < NUM_CAMML_REGS; ++i) {
+ g_assert_cmpuint(emc_read(qts, mod, REG_CAMM_BASE + i * 2), ==,
+ 0);
+ g_assert_cmpuint(emc_read(qts, mod, REG_CAML_BASE + i * 2), ==,
+ 0);
+ }
+
+ qtest_quit(qts);
+}
+
+static bool emc_wait_irq(QTestState *qts, const EMCModule *mod, int step,
+ bool is_tx)
+{
+ uint64_t end_time =
+ g_get_monotonic_time() + TIMEOUT_SECONDS * G_TIME_SPAN_SECOND;
+
+ do {
+ if (qtest_get_irq(qts, is_tx ? mod->tx_irq : mod->rx_irq)) {
+ return true;
+ }
+ qtest_clock_step(qts, step);
+ } while (g_get_monotonic_time() < end_time);
+
+ g_message("%s: Timeout expired", __func__);
+ return false;
+}
+
+static bool emc_wait_mista(QTestState *qts, const EMCModule *mod, int step,
+ uint32_t flag)
+{
+ uint64_t end_time =
+ g_get_monotonic_time() + TIMEOUT_SECONDS * G_TIME_SPAN_SECOND;
+
+ do {
+ uint32_t mista = emc_read(qts, mod, REG_MISTA);
+ if (mista & flag) {
+ return true;
+ }
+ qtest_clock_step(qts, step);
+ } while (g_get_monotonic_time() < end_time);
+
+ g_message("%s: Timeout expired", __func__);
+ return false;
+}
+
+static bool wait_socket_readable(int fd)
+{
+ fd_set read_fds;
+ struct timeval tv;
+ int rv;
+
+ FD_ZERO(&read_fds);
+ FD_SET(fd, &read_fds);
+ tv.tv_sec = TIMEOUT_SECONDS;
+ tv.tv_usec = 0;
+ rv = select(fd + 1, &read_fds, NULL, NULL, &tv);
+ if (rv == -1) {
+ perror("select");
+ } else if (rv == 0) {
+ g_message("%s: Timeout expired", __func__);
+ }
+ return rv == 1;
+}
+
+static void init_tx_desc(NPCM7xxEMCTxDesc *desc, size_t count,
+ uint32_t desc_addr)
+{
+ g_assert(count >= 2);
+ memset(&desc[0], 0, sizeof(*desc) * count);
+ /* Leave the last one alone, owned by the cpu -> stops transmission. */
+ for (size_t i = 0; i < count - 1; ++i) {
+ desc[i].flags =
+ cpu_to_le32(TX_DESC_FLAG_OWNER_MASK | /* owner = 1: emc */
+ TX_DESC_FLAG_INTEN |
+ 0 | /* crc append = 0 */
+ 0 /* padding enable = 0 */);
+ desc[i].status_and_length =
+ cpu_to_le32(0 | /* collision count = 0 */
+ 0 | /* SQE = 0 */
+ 0 | /* PAU = 0 */
+ 0 | /* TXHA = 0 */
+ 0 | /* LC = 0 */
+ 0 | /* TXABT = 0 */
+ 0 | /* NCS = 0 */
+ 0 | /* EXDEF = 0 */
+ 0 | /* TXCP = 0 */
+ 0 | /* DEF = 0 */
+ 0 | /* TXINTR = 0 */
+ 0 /* length filled in later */);
+ desc[i].ntxdsa = cpu_to_le32(desc_addr + (i + 1) * sizeof(*desc));
+ }
+}
+
+static void enable_tx(QTestState *qts, const EMCModule *mod,
+ const NPCM7xxEMCTxDesc *desc, size_t count,
+ uint32_t desc_addr, uint32_t mien_flags)
+{
+ /* Write the descriptors to guest memory. */
+ qtest_memwrite(qts, desc_addr, desc, sizeof(*desc) * count);
+
+ /* Trigger sending the packet. */
+ /* The module must be reset before changing TXDLSA. */
+ g_assert(emc_soft_reset(qts, mod));
+ emc_write(qts, mod, REG_TXDLSA, desc_addr);
+ emc_write(qts, mod, REG_CTXDSA, ~0);
+ emc_write(qts, mod, REG_MIEN, REG_MIEN_ENTXCP | mien_flags);
+ {
+ uint32_t mcmdr = emc_read(qts, mod, REG_MCMDR);
+ mcmdr |= REG_MCMDR_TXON;
+ emc_write(qts, mod, REG_MCMDR, mcmdr);
+ }
+
+ /* Prod the device to send the packet. */
+ emc_write(qts, mod, REG_TSDR, 1);
+}
+
+static void emc_send_verify1(QTestState *qts, const EMCModule *mod, int fd,
+ bool with_irq, uint32_t desc_addr,
+ uint32_t next_desc_addr,
+ const char *test_data, int test_size)
+{
+ NPCM7xxEMCTxDesc result_desc;
+ uint32_t expected_mask, expected_value, recv_len;
+ int ret;
+ char buffer[TX_DATA_LEN];
+
+ g_assert(wait_socket_readable(fd));
+
+ /* Read the descriptor back. */
+ qtest_memread(qts, desc_addr, &result_desc, sizeof(result_desc));
+ /* Descriptor should be owned by cpu now. */
+ g_assert((result_desc.flags & TX_DESC_FLAG_OWNER_MASK) == 0);
+ /* Test the status bits, ignoring the length field. */
+ expected_mask = 0xffff << 16;
+ expected_value = TX_DESC_STATUS_TXCP;
+ if (with_irq) {
+ expected_value |= TX_DESC_STATUS_TXINTR;
+ }
+ g_assert_cmphex((result_desc.status_and_length & expected_mask), ==,
+ expected_value);
+
+ /* Check data sent to the backend. */
+ recv_len = ~0;
+ ret = qemu_recv(fd, &recv_len, sizeof(recv_len), MSG_DONTWAIT);
+ g_assert_cmpint(ret, == , sizeof(recv_len));
+
+ g_assert(wait_socket_readable(fd));
+ memset(buffer, 0xff, sizeof(buffer));
+ ret = qemu_recv(fd, buffer, test_size, MSG_DONTWAIT);
+ g_assert_cmpmem(buffer, ret, test_data, test_size);
+}
+
+static void emc_send_verify(QTestState *qts, const EMCModule *mod, int fd,
+ bool with_irq)
+{
+ NPCM7xxEMCTxDesc desc[NUM_TX_DESCRIPTORS];
+ uint32_t desc_addr = DESC_ADDR;
+ static const char test1_data[] = "TEST1";
+ static const char test2_data[] = "Testing 1 2 3 ...";
+ uint32_t data1_addr = DATA_ADDR;
+ uint32_t data2_addr = data1_addr + sizeof(test1_data);
+ bool got_tdu;
+ uint32_t end_desc_addr;
+
+ /* Prepare test data buffer. */
+ qtest_memwrite(qts, data1_addr, test1_data, sizeof(test1_data));
+ qtest_memwrite(qts, data2_addr, test2_data, sizeof(test2_data));
+
+ init_tx_desc(&desc[0], NUM_TX_DESCRIPTORS, desc_addr);
+ desc[0].txbsa = cpu_to_le32(data1_addr);
+ desc[0].status_and_length |= sizeof(test1_data);
+ desc[1].txbsa = cpu_to_le32(data2_addr);
+ desc[1].status_and_length |= sizeof(test2_data);
+
+ enable_tx(qts, mod, &desc[0], NUM_TX_DESCRIPTORS, desc_addr,
+ with_irq ? REG_MIEN_ENTXINTR : 0);
+
+ /*
+ * It's problematic to observe the interrupt for each packet.
+ * Instead just wait until all the packets go out.
+ */
+ got_tdu = false;
+ while (!got_tdu) {
+ if (with_irq) {
+ g_assert_true(emc_wait_irq(qts, mod, TX_STEP_COUNT,
+ /*is_tx=*/true));
+ } else {
+ g_assert_true(emc_wait_mista(qts, mod, TX_STEP_COUNT,
+ REG_MISTA_TXINTR));
+ }
+ got_tdu = !!(emc_read(qts, mod, REG_MISTA) & REG_MISTA_TDU);
+ /* If we don't have TDU yet, reset the interrupt. */
+ if (!got_tdu) {
+ emc_write(qts, mod, REG_MISTA,
+ emc_read(qts, mod, REG_MISTA) & 0xffff0000);
+ }
+ }
+
+ end_desc_addr = desc_addr + 2 * sizeof(desc[0]);
+ g_assert_cmphex(emc_read(qts, mod, REG_CTXDSA), ==, end_desc_addr);
+ g_assert_cmphex(emc_read(qts, mod, REG_MISTA), ==,
+ REG_MISTA_TXCP | REG_MISTA_TXINTR | REG_MISTA_TDU);
+
+ emc_send_verify1(qts, mod, fd, with_irq,
+ desc_addr, end_desc_addr,
+ test1_data, sizeof(test1_data));
+ emc_send_verify1(qts, mod, fd, with_irq,
+ desc_addr + sizeof(desc[0]), end_desc_addr,
+ test2_data, sizeof(test2_data));
+}
+
+static void init_rx_desc(NPCM7xxEMCRxDesc *desc, size_t count,
+ uint32_t desc_addr, uint32_t data_addr)
+{
+ g_assert_true(count >= 2);
+ memset(desc, 0, sizeof(*desc) * count);
+ desc[0].rxbsa = cpu_to_le32(data_addr);
+ desc[0].status_and_length =
+ cpu_to_le32(0b10 << RX_DESC_STATUS_OWNER_SHIFT | /* owner = 10: emc */
+ 0 | /* RP = 0 */
+ 0 | /* ALIE = 0 */
+ 0 | /* RXGD = 0 */
+ 0 | /* PTLE = 0 */
+ 0 | /* CRCE = 0 */
+ 0 | /* RXINTR = 0 */
+ 0 /* length (filled in later) */);
+ /* Leave the last one alone, owned by the cpu -> stops transmission. */
+ desc[0].nrxdsa = cpu_to_le32(desc_addr + sizeof(*desc));
+}
+
+static void enable_rx(QTestState *qts, const EMCModule *mod,
+ const NPCM7xxEMCRxDesc *desc, size_t count,
+ uint32_t desc_addr, uint32_t mien_flags,
+ uint32_t mcmdr_flags)
+{
+ /*
+ * Write the descriptor to guest memory.
+ * FWIW, IWBN if the docs said the buffer needs to be at least DMARFC
+ * bytes.
+ */
+ qtest_memwrite(qts, desc_addr, desc, sizeof(*desc) * count);
+
+ /* Trigger receiving the packet. */
+ /* The module must be reset before changing RXDLSA. */
+ g_assert(emc_soft_reset(qts, mod));
+ emc_write(qts, mod, REG_RXDLSA, desc_addr);
+ emc_write(qts, mod, REG_MIEN, REG_MIEN_ENRXGD | mien_flags);
+
+ /*
+ * We don't know what the device's macaddr is, so just accept all
+ * unicast packets (AUP).
+ */
+ emc_write(qts, mod, REG_CAMCMR, REG_CAMCMR_AUP);
+ emc_write(qts, mod, REG_CAMEN, 1 << 0);
+ {
+ uint32_t mcmdr = emc_read(qts, mod, REG_MCMDR);
+ mcmdr |= REG_MCMDR_RXON | mcmdr_flags;
+ emc_write(qts, mod, REG_MCMDR, mcmdr);
+ }
+
+ /* Prod the device to accept a packet. */
+ emc_write(qts, mod, REG_RSDR, 1);
+}
+
+static void emc_recv_verify(QTestState *qts, const EMCModule *mod, int fd,
+ bool with_irq)
+{
+ NPCM7xxEMCRxDesc desc[NUM_RX_DESCRIPTORS];
+ uint32_t desc_addr = DESC_ADDR;
+ uint32_t data_addr = DATA_ADDR;
+ int ret;
+ uint32_t expected_mask, expected_value;
+ NPCM7xxEMCRxDesc result_desc;
+
+ /* Prepare test data buffer. */
+ const char test[RX_DATA_LEN] = "TEST";
+ int len = htonl(sizeof(test));
+ const struct iovec iov[] = {
+ {
+ .iov_base = &len,
+ .iov_len = sizeof(len),
+ },{
+ .iov_base = (char *) test,
+ .iov_len = sizeof(test),
+ },
+ };
+
+ /*
+ * Reset the device BEFORE sending a test packet, otherwise the packet
+ * may get swallowed by an active device of an earlier test.
+ */
+ init_rx_desc(&desc[0], NUM_RX_DESCRIPTORS, desc_addr, data_addr);
+ enable_rx(qts, mod, &desc[0], NUM_RX_DESCRIPTORS, desc_addr,
+ with_irq ? REG_MIEN_ENRXINTR : 0, 0);
+
+ /* Send test packet to device's socket. */
+ ret = iov_send(fd, iov, 2, 0, sizeof(len) + sizeof(test));
+ g_assert_cmpint(ret, == , sizeof(test) + sizeof(len));
+
+ /* Wait for RX interrupt. */
+ if (with_irq) {
+ g_assert_true(emc_wait_irq(qts, mod, RX_STEP_COUNT, /*is_tx=*/false));
+ } else {
+ g_assert_true(emc_wait_mista(qts, mod, RX_STEP_COUNT, REG_MISTA_RXGD));
+ }
+
+ g_assert_cmphex(emc_read(qts, mod, REG_CRXDSA), ==,
+ desc_addr + sizeof(desc[0]));
+
+ expected_mask = 0xffff;
+ expected_value = (REG_MISTA_DENI |
+ REG_MISTA_RXGD |
+ REG_MISTA_RXINTR);
+ g_assert_cmphex((emc_read(qts, mod, REG_MISTA) & expected_mask),
+ ==, expected_value);
+
+ /* Read the descriptor back. */
+ qtest_memread(qts, desc_addr, &result_desc, sizeof(result_desc));
+ /* Descriptor should be owned by cpu now. */
+ g_assert((result_desc.status_and_length & RX_DESC_STATUS_OWNER_MASK) == 0);
+ /* Test the status bits, ignoring the length field. */
+ expected_mask = 0xffff << 16;
+ expected_value = RX_DESC_STATUS_RXGD;
+ if (with_irq) {
+ expected_value |= RX_DESC_STATUS_RXINTR;
+ }
+ g_assert_cmphex((result_desc.status_and_length & expected_mask), ==,
+ expected_value);
+ g_assert_cmpint(RX_DESC_PKT_LEN(result_desc.status_and_length), ==,
+ RX_DATA_LEN + CRC_LENGTH);
+
+ {
+ char buffer[RX_DATA_LEN];
+ qtest_memread(qts, data_addr, buffer, sizeof(buffer));
+ g_assert_cmpstr(buffer, == , "TEST");
+ }
+}
+
+static void emc_test_ptle(QTestState *qts, const EMCModule *mod, int fd)
+{
+ NPCM7xxEMCRxDesc desc[NUM_RX_DESCRIPTORS];
+ uint32_t desc_addr = DESC_ADDR;
+ uint32_t data_addr = DATA_ADDR;
+ int ret;
+ NPCM7xxEMCRxDesc result_desc;
+ uint32_t expected_mask, expected_value;
+
+ /* Prepare test data buffer. */
+#define PTLE_DATA_LEN 1600
+ char test_data[PTLE_DATA_LEN];
+ int len = htonl(sizeof(test_data));
+ const struct iovec iov[] = {
+ {
+ .iov_base = &len,
+ .iov_len = sizeof(len),
+ },{
+ .iov_base = (char *) test_data,
+ .iov_len = sizeof(test_data),
+ },
+ };
+ memset(test_data, 42, sizeof(test_data));
+
+ /*
+ * Reset the device BEFORE sending a test packet, otherwise the packet
+ * may get swallowed by an active device of an earlier test.
+ */
+ init_rx_desc(&desc[0], NUM_RX_DESCRIPTORS, desc_addr, data_addr);
+ enable_rx(qts, mod, &desc[0], NUM_RX_DESCRIPTORS, desc_addr,
+ REG_MIEN_ENRXINTR, REG_MCMDR_ALP);
+
+ /* Send test packet to device's socket. */
+ ret = iov_send(fd, iov, 2, 0, sizeof(len) + sizeof(test_data));
+ g_assert_cmpint(ret, == , sizeof(test_data) + sizeof(len));
+
+ /* Wait for RX interrupt. */
+ g_assert_true(emc_wait_irq(qts, mod, RX_STEP_COUNT, /*is_tx=*/false));
+
+ /* Read the descriptor back. */
+ qtest_memread(qts, desc_addr, &result_desc, sizeof(result_desc));
+ /* Descriptor should be owned by cpu now. */
+ g_assert((result_desc.status_and_length & RX_DESC_STATUS_OWNER_MASK) == 0);
+ /* Test the status bits, ignoring the length field. */
+ expected_mask = 0xffff << 16;
+ expected_value = (RX_DESC_STATUS_RXGD |
+ RX_DESC_STATUS_PTLE |
+ RX_DESC_STATUS_RXINTR);
+ g_assert_cmphex((result_desc.status_and_length & expected_mask), ==,
+ expected_value);
+ g_assert_cmpint(RX_DESC_PKT_LEN(result_desc.status_and_length), ==,
+ PTLE_DATA_LEN + CRC_LENGTH);
+
+ {
+ char buffer[PTLE_DATA_LEN];
+ qtest_memread(qts, data_addr, buffer, sizeof(buffer));
+ g_assert(memcmp(buffer, test_data, PTLE_DATA_LEN) == 0);
+ }
+}
+
+static void test_tx(gconstpointer test_data)
+{
+ const TestData *td = test_data;
+ GString *cmd_line = g_string_new("-machine quanta-gsj");
+ int *test_sockets = packet_test_init(emc_module_index(td->module),
+ cmd_line);
+ QTestState *qts = qtest_init(cmd_line->str);
+
+ /*
+ * TODO: For pedantic correctness test_sockets[0] should be closed after
+ * the fork and before the exec, but that will require some harness
+ * improvements.
+ */
+ close(test_sockets[1]);
+ /* Defensive programming */
+ test_sockets[1] = -1;
+
+ qtest_irq_intercept_in(qts, "/machine/soc/a9mpcore/gic");
+
+ emc_send_verify(qts, td->module, test_sockets[0], /*with_irq=*/false);
+ emc_send_verify(qts, td->module, test_sockets[0], /*with_irq=*/true);
+
+ qtest_quit(qts);
+}
+
+static void test_rx(gconstpointer test_data)
+{
+ const TestData *td = test_data;
+ GString *cmd_line = g_string_new("-machine quanta-gsj");
+ int *test_sockets = packet_test_init(emc_module_index(td->module),
+ cmd_line);
+ QTestState *qts = qtest_init(cmd_line->str);
+
+ /*
+ * TODO: For pedantic correctness test_sockets[0] should be closed after
+ * the fork and before the exec, but that will require some harness
+ * improvements.
+ */
+ close(test_sockets[1]);
+ /* Defensive programming */
+ test_sockets[1] = -1;
+
+ qtest_irq_intercept_in(qts, "/machine/soc/a9mpcore/gic");
+
+ emc_recv_verify(qts, td->module, test_sockets[0], /*with_irq=*/false);
+ emc_recv_verify(qts, td->module, test_sockets[0], /*with_irq=*/true);
+ emc_test_ptle(qts, td->module, test_sockets[0]);
+
+ qtest_quit(qts);
+}
+
+static void emc_add_test(const char *name, const TestData* td,
+ GTestDataFunc fn)
+{
+ g_autofree char *full_name = g_strdup_printf(
+ "npcm7xx_emc/emc[%d]/%s", emc_module_index(td->module), name);
+ qtest_add_data_func(full_name, td, fn);
+}
+#define add_test(name, td) emc_add_test(#name, td, test_##name)
+
+int main(int argc, char **argv)
+{
+ TestData test_data_list[ARRAY_SIZE(emc_module_list)];
+
+ g_test_init(&argc, &argv, NULL);
+
+ for (int i = 0; i < ARRAY_SIZE(emc_module_list); ++i) {
+ TestData *td = &test_data_list[i];
+
+ td->module = &emc_module_list[i];
+
+ add_test(init, td);
+ add_test(tx, td);
+ add_test(rx, td);
+ }
+
+ return g_test_run();
+}
--
2.30.0.478.g8a0d178c01-goog
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