/* * QEMU model of XGMAC Ethernet. * * derived from the Xilinx AXI-Ethernet by Edgar E. Iglesias. * * Copyright (c) 2011 Calxeda, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "sysbus.h" #include "qemu-char.h" #include "qemu-log.h" #include "net.h" #include "net/checksum.h" #ifdef DEBUG_XGMAC #define DEBUGF_BRK(message, args...) do { \ fprintf(stderr, (message), ## args); \ } while (0) #else #define DEBUGF_BRK(message, args...) do { } while (0) #endif #define XGMAC_CONTROL 0x00000000 /* MAC Configuration */ #define XGMAC_FRAME_FILTER 0x00000001 /* MAC Frame Filter */ #define XGMAC_FLOW_CTRL 0x00000006 /* MAC Flow Control */ #define XGMAC_VLAN_TAG 0x00000007 /* VLAN Tags */ #define XGMAC_VERSION 0x00000008 /* Version */ /* VLAN tag for insertion or replacement into tx frames */ #define XGMAC_VLAN_INCL 0x00000009 #define XGMAC_LPI_CTRL 0x0000000a /* LPI Control and Status */ #define XGMAC_LPI_TIMER 0x0000000b /* LPI Timers Control */ #define XGMAC_TX_PACE 0x0000000c /* Transmit Pace and Stretch */ #define XGMAC_VLAN_HASH 0x0000000d /* VLAN Hash Table */ #define XGMAC_DEBUG 0x0000000e /* Debug */ #define XGMAC_INT_STATUS 0x0000000f /* Interrupt and Control */ /* HASH table registers */ #define XGMAC_HASH(n) ((0x00000300/4) + (n)) #define XGMAC_NUM_HASH 16 /* Operation Mode */ #define XGMAC_OPMODE (0x00000400/4) /* Remote Wake-Up Frame Filter */ #define XGMAC_REMOTE_WAKE (0x00000700/4) /* PMT Control and Status */ #define XGMAC_PMT (0x00000704/4) #define XGMAC_ADDR_HIGH(reg) (0x00000010+((reg) * 2)) #define XGMAC_ADDR_LOW(reg) (0x00000011+((reg) * 2)) #define DMA_BUS_MODE 0x000003c0 /* Bus Mode */ #define DMA_XMT_POLL_DEMAND 0x000003c1 /* Transmit Poll Demand */ #define DMA_RCV_POLL_DEMAND 0x000003c2 /* Received Poll Demand */ #define DMA_RCV_BASE_ADDR 0x000003c3 /* Receive List Base */ #define DMA_TX_BASE_ADDR 0x000003c4 /* Transmit List Base */ #define DMA_STATUS 0x000003c5 /* Status Register */ #define DMA_CONTROL 0x000003c6 /* Ctrl (Operational Mode) */ #define DMA_INTR_ENA 0x000003c7 /* Interrupt Enable */ #define DMA_MISSED_FRAME_CTR 0x000003c8 /* Missed Frame Counter */ /* Receive Interrupt Watchdog Timer */ #define DMA_RI_WATCHDOG_TIMER 0x000003c9 #define DMA_AXI_BUS 0x000003ca /* AXI Bus Mode */ #define DMA_AXI_STATUS 0x000003cb /* AXI Status */ #define DMA_CUR_TX_DESC_ADDR 0x000003d2 /* Current Host Tx Descriptor */ #define DMA_CUR_RX_DESC_ADDR 0x000003d3 /* Current Host Rx Descriptor */ #define DMA_CUR_TX_BUF_ADDR 0x000003d4 /* Current Host Tx Buffer */ #define DMA_CUR_RX_BUF_ADDR 0x000003d5 /* Current Host Rx Buffer */ #define DMA_HW_FEATURE 0x000003d6 /* Enabled Hardware Features */ /* DMA Status register defines */ #define DMA_STATUS_GMI 0x08000000 /* MMC interrupt */ #define DMA_STATUS_GLI 0x04000000 /* GMAC Line interface int */ #define DMA_STATUS_EB_MASK 0x00380000 /* Error Bits Mask */ #define DMA_STATUS_EB_TX_ABORT 0x00080000 /* Error Bits - TX Abort */ #define DMA_STATUS_EB_RX_ABORT 0x00100000 /* Error Bits - RX Abort */ #define DMA_STATUS_TS_MASK 0x00700000 /* Transmit Process State */ #define DMA_STATUS_TS_SHIFT 20 #define DMA_STATUS_RS_MASK 0x000e0000 /* Receive Process State */ #define DMA_STATUS_RS_SHIFT 17 #define DMA_STATUS_NIS 0x00010000 /* Normal Interrupt Summary */ #define DMA_STATUS_AIS 0x00008000 /* Abnormal Interrupt Summary */ #define DMA_STATUS_ERI 0x00004000 /* Early Receive Interrupt */ #define DMA_STATUS_FBI 0x00002000 /* Fatal Bus Error Interrupt */ #define DMA_STATUS_ETI 0x00000400 /* Early Transmit Interrupt */ #define DMA_STATUS_RWT 0x00000200 /* Receive Watchdog Timeout */ #define DMA_STATUS_RPS 0x00000100 /* Receive Process Stopped */ #define DMA_STATUS_RU 0x00000080 /* Receive Buffer Unavailable */ #define DMA_STATUS_RI 0x00000040 /* Receive Interrupt */ #define DMA_STATUS_UNF 0x00000020 /* Transmit Underflow */ #define DMA_STATUS_OVF 0x00000010 /* Receive Overflow */ #define DMA_STATUS_TJT 0x00000008 /* Transmit Jabber Timeout */ #define DMA_STATUS_TU 0x00000004 /* Transmit Buffer Unavailable */ #define DMA_STATUS_TPS 0x00000002 /* Transmit Process Stopped */ #define DMA_STATUS_TI 0x00000001 /* Transmit Interrupt */ /* DMA Control register defines */ #define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */ #define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */ #define DMA_CONTROL_DFF 0x01000000 /* Disable flush of rx frames */ struct desc { uint32_t ctl_stat; uint16_t buffer1_size; uint16_t buffer2_size; uint32_t buffer1_addr; uint32_t buffer2_addr; uint32_t ext_stat; uint32_t res[3]; }; #define R_MAX 0x400 typedef struct RxTxStats { uint64_t rx_bytes; uint64_t tx_bytes; uint64_t rx; uint64_t rx_bcast; uint64_t rx_mcast; } RxTxStats; typedef struct XgmacState { SysBusDevice busdev; MemoryRegion iomem; qemu_irq sbd_irq; qemu_irq pmt_irq; qemu_irq mci_irq; NICState *nic; NICConf conf; struct RxTxStats stats; uint32_t regs[R_MAX]; } XgmacState; const VMStateDescription vmstate_rxtx_stats = { .name = "xgmac_stats", .version_id = 1, .minimum_version_id = 1, .fields = (VMStateField[]) { VMSTATE_UINT64(rx_bytes, RxTxStats), VMSTATE_UINT64(tx_bytes, RxTxStats), VMSTATE_UINT64(rx, RxTxStats), VMSTATE_UINT64(rx_bcast, RxTxStats), VMSTATE_UINT64(rx_mcast, RxTxStats), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_xgmac = { .name = "xgmac", .version_id = 1, .minimum_version_id = 1, .fields = (VMStateField[]) { VMSTATE_STRUCT(stats, XgmacState, 0, vmstate_rxtx_stats, RxTxStats), VMSTATE_UINT32_ARRAY(regs, XgmacState, R_MAX), VMSTATE_END_OF_LIST() } }; static void xgmac_read_desc(struct XgmacState *s, struct desc *d, int rx) { uint32_t addr = rx ? s->regs[DMA_CUR_RX_DESC_ADDR] : s->regs[DMA_CUR_TX_DESC_ADDR]; cpu_physical_memory_read(addr, d, sizeof(*d)); } static void xgmac_write_desc(struct XgmacState *s, struct desc *d, int rx) { int reg = rx ? DMA_CUR_RX_DESC_ADDR : DMA_CUR_TX_DESC_ADDR; uint32_t addr = s->regs[reg]; if (!rx && (d->ctl_stat & 0x00200000)) { s->regs[reg] = s->regs[DMA_TX_BASE_ADDR]; } else if (rx && (d->buffer1_size & 0x8000)) { s->regs[reg] = s->regs[DMA_RCV_BASE_ADDR]; } else { s->regs[reg] += sizeof(*d); } cpu_physical_memory_write(addr, d, sizeof(*d)); } static void xgmac_enet_send(struct XgmacState *s) { struct desc bd; int frame_size; int len; uint8_t frame[8192]; uint8_t *ptr; ptr = frame; frame_size = 0; while (1) { xgmac_read_desc(s, &bd, 0); if ((bd.ctl_stat & 0x80000000) == 0) { /* Run out of descriptors to transmit. */ break; } len = (bd.buffer1_size & 0xfff) + (bd.buffer2_size & 0xfff); if ((bd.buffer1_size & 0xfff) > 2048) { DEBUGF_BRK("qemu:%s:ERROR...ERROR...ERROR... -- " "xgmac buffer 1 len on send > 2048 (0x%x)\n", __func__, bd.buffer1_size & 0xfff); } if ((bd.buffer2_size & 0xfff) != 0) { DEBUGF_BRK("qemu:%s:ERROR...ERROR...ERROR... -- " "xgmac buffer 2 len on send != 0 (0x%x)\n", __func__, bd.buffer2_size & 0xfff); } if (len >= sizeof(frame)) { DEBUGF_BRK("qemu:%s: buffer overflow %d read into %zu " "buffer\n" , __func__, len, sizeof(frame)); DEBUGF_BRK("qemu:%s: buffer1.size=%d; buffer2.size=%d\n", __func__, bd.buffer1_size, bd.buffer2_size); } cpu_physical_memory_read(bd.buffer1_addr, ptr, len); ptr += len; frame_size += len; if (bd.ctl_stat & 0x20000000) { /* Last buffer in frame. */ qemu_send_packet(&s->nic->nc, frame, len); ptr = frame; frame_size = 0; s->regs[DMA_STATUS] |= DMA_STATUS_TI | DMA_STATUS_NIS; } bd.ctl_stat &= ~0x80000000; /* Write back the modified descriptor. */ xgmac_write_desc(s, &bd, 0); } } static void enet_update_irq(struct XgmacState *s) { int stat = s->regs[DMA_STATUS] & s->regs[DMA_INTR_ENA]; qemu_set_irq(s->sbd_irq, !!stat); } static uint64_t enet_read(void *opaque, target_phys_addr_t addr, unsigned size) { struct XgmacState *s = opaque; uint64_t r = 0; addr >>= 2; switch (addr) { case XGMAC_VERSION: r = 0x1012; break; default: if (addr < ARRAY_SIZE(s->regs)) { r = s->regs[addr]; } break; } return r; } static void enet_write(void *opaque, target_phys_addr_t addr, uint64_t value, unsigned size) { struct XgmacState *s = opaque; addr >>= 2; switch (addr) { case DMA_BUS_MODE: s->regs[DMA_BUS_MODE] = value & ~0x1; break; case DMA_XMT_POLL_DEMAND: xgmac_enet_send(s); break; case DMA_STATUS: s->regs[DMA_STATUS] = s->regs[DMA_STATUS] & ~value; break; case DMA_RCV_BASE_ADDR: s->regs[DMA_RCV_BASE_ADDR] = s->regs[DMA_CUR_RX_DESC_ADDR] = value; break; case DMA_TX_BASE_ADDR: s->regs[DMA_TX_BASE_ADDR] = s->regs[DMA_CUR_TX_DESC_ADDR] = value; break; default: if (addr < ARRAY_SIZE(s->regs)) { s->regs[addr] = value; } break; } enet_update_irq(s); } static const MemoryRegionOps enet_mem_ops = { .read = enet_read, .write = enet_write, .endianness = DEVICE_LITTLE_ENDIAN, }; static int eth_can_rx(VLANClientState *nc) { struct XgmacState *s = DO_UPCAST(NICState, nc, nc)->opaque; /* RX enabled? */ return s->regs[DMA_CONTROL] & DMA_CONTROL_SR; } static ssize_t eth_rx(VLANClientState *nc, const uint8_t *buf, size_t size) { struct XgmacState *s = DO_UPCAST(NICState, nc, nc)->opaque; static const unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; int unicast, broadcast, multicast; struct desc bd; ssize_t ret; unicast = ~buf[0] & 0x1; broadcast = memcmp(buf, sa_bcast, 6) == 0; multicast = !unicast && !broadcast; if (size < 12) { s->regs[DMA_STATUS] |= DMA_STATUS_RI | DMA_STATUS_NIS; ret = -1; goto out; } xgmac_read_desc(s, &bd, 1); if ((bd.ctl_stat & 0x80000000) == 0) { s->regs[DMA_STATUS] |= DMA_STATUS_RU | DMA_STATUS_AIS; ret = size; goto out; } cpu_physical_memory_write(bd.buffer1_addr, buf, size); /* Add in the 4 bytes for crc (the real hw returns length incl crc) */ size += 4; bd.ctl_stat = (size << 16) | 0x300; xgmac_write_desc(s, &bd, 1); s->stats.rx_bytes += size; s->stats.rx++; if (multicast) { s->stats.rx_mcast++; } else if (broadcast) { s->stats.rx_bcast++; } s->regs[DMA_STATUS] |= DMA_STATUS_RI | DMA_STATUS_NIS; ret = size; out: enet_update_irq(s); return ret; } static void eth_cleanup(VLANClientState *nc) { struct XgmacState *s = DO_UPCAST(NICState, nc, nc)->opaque; s->nic = NULL; } static NetClientInfo net_xgmac_enet_info = { .type = NET_CLIENT_TYPE_NIC, .size = sizeof(NICState), .can_receive = eth_can_rx, .receive = eth_rx, .cleanup = eth_cleanup, }; static int xgmac_enet_init(SysBusDevice *dev) { struct XgmacState *s = FROM_SYSBUS(typeof(*s), dev); memory_region_init_io(&s->iomem, &enet_mem_ops, s, "xgmac", 0x1000); sysbus_init_mmio(dev, &s->iomem); sysbus_init_irq(dev, &s->sbd_irq); sysbus_init_irq(dev, &s->pmt_irq); sysbus_init_irq(dev, &s->mci_irq); qemu_macaddr_default_if_unset(&s->conf.macaddr); s->nic = qemu_new_nic(&net_xgmac_enet_info, &s->conf, object_get_typename(OBJECT(dev)), dev->qdev.id, s); qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a); s->regs[XGMAC_ADDR_HIGH(0)] = (s->conf.macaddr.a[5] << 8) | s->conf.macaddr.a[4]; s->regs[XGMAC_ADDR_LOW(0)] = (s->conf.macaddr.a[3] << 24) | (s->conf.macaddr.a[2] << 16) | (s->conf.macaddr.a[1] << 8) | s->conf.macaddr.a[0]; return 0; } static Property xgmac_properties[] = { DEFINE_NIC_PROPERTIES(struct XgmacState, conf), DEFINE_PROP_END_OF_LIST(), }; static void xgmac_enet_class_init(ObjectClass *klass, void *data) { SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass); sbc->init = xgmac_enet_init; dc->vmsd = &vmstate_xgmac; dc->props = xgmac_properties; } static TypeInfo xgmac_enet_info = { .name = "xgmac", .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(struct XgmacState), .class_init = xgmac_enet_class_init, }; static void xgmac_enet_register_types(void) { type_register_static(&xgmac_enet_info); } type_init(xgmac_enet_register_types)