diff options
Diffstat (limited to 'hw/net/xgmac.c')
| -rw-r--r-- | hw/net/xgmac.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/hw/net/xgmac.c b/hw/net/xgmac.c new file mode 100644 index 0000000000..5275f4810d --- /dev/null +++ b/hw/net/xgmac.c @@ -0,0 +1,433 @@ +/* + * 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 "hw/sysbus.h" +#include "char/char.h" +#include "qemu/log.h" +#include "net/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(qemu_get_queue(s->nic), 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, hwaddr 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, hwaddr 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(NetClientState *nc) +{ + struct XgmacState *s = qemu_get_nic_opaque(nc); + + /* RX enabled? */ + return s->regs[DMA_CONTROL] & DMA_CONTROL_SR; +} + +static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size) +{ + struct XgmacState *s = qemu_get_nic_opaque(nc); + 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(NetClientState *nc) +{ + struct XgmacState *s = qemu_get_nic_opaque(nc); + s->nic = NULL; +} + +static NetClientInfo net_xgmac_enet_info = { + .type = NET_CLIENT_OPTIONS_KIND_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(qemu_get_queue(s->nic), 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 const 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) |