diff options
Diffstat (limited to 'src/hw/net/allwinner_emac.c')
| -rw-r--r-- | src/hw/net/allwinner_emac.c | 533 |
1 files changed, 533 insertions, 0 deletions
diff --git a/src/hw/net/allwinner_emac.c b/src/hw/net/allwinner_emac.c new file mode 100644 index 0000000..0407dee --- /dev/null +++ b/src/hw/net/allwinner_emac.c @@ -0,0 +1,533 @@ +/* + * Emulation of Allwinner EMAC Fast Ethernet controller and + * Realtek RTL8201CP PHY + * + * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> + * + * This model is based on reverse-engineering of Linux kernel driver. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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 "hw/sysbus.h" +#include "net/net.h" +#include "qemu/fifo8.h" +#include "hw/net/allwinner_emac.h" +#include <zlib.h> + +static uint8_t padding[60]; + +static void mii_set_link(RTL8201CPState *mii, bool link_ok) +{ + if (link_ok) { + mii->bmsr |= MII_BMSR_LINK_ST | MII_BMSR_AN_COMP; + mii->anlpar |= MII_ANAR_TXFD | MII_ANAR_10FD | MII_ANAR_10 | + MII_ANAR_CSMACD; + } else { + mii->bmsr &= ~(MII_BMSR_LINK_ST | MII_BMSR_AN_COMP); + mii->anlpar = MII_ANAR_TX; + } +} + +static void mii_reset(RTL8201CPState *mii, bool link_ok) +{ + mii->bmcr = MII_BMCR_FD | MII_BMCR_AUTOEN | MII_BMCR_SPEED; + mii->bmsr = MII_BMSR_100TX_FD | MII_BMSR_100TX_HD | MII_BMSR_10T_FD | + MII_BMSR_10T_HD | MII_BMSR_MFPS | MII_BMSR_AUTONEG; + mii->anar = MII_ANAR_TXFD | MII_ANAR_TX | MII_ANAR_10FD | MII_ANAR_10 | + MII_ANAR_CSMACD; + mii->anlpar = MII_ANAR_TX; + + mii_set_link(mii, link_ok); +} + +static uint16_t RTL8201CP_mdio_read(AwEmacState *s, uint8_t addr, uint8_t reg) +{ + RTL8201CPState *mii = &s->mii; + uint16_t ret = 0xffff; + + if (addr == s->phy_addr) { + switch (reg) { + case MII_BMCR: + return mii->bmcr; + case MII_BMSR: + return mii->bmsr; + case MII_PHYID1: + return RTL8201CP_PHYID1; + case MII_PHYID2: + return RTL8201CP_PHYID2; + case MII_ANAR: + return mii->anar; + case MII_ANLPAR: + return mii->anlpar; + case MII_ANER: + case MII_NSR: + case MII_LBREMR: + case MII_REC: + case MII_SNRDR: + case MII_TEST: + qemu_log_mask(LOG_UNIMP, + "allwinner_emac: read from unimpl. mii reg 0x%x\n", + reg); + return 0; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "allwinner_emac: read from invalid mii reg 0x%x\n", + reg); + return 0; + } + } + return ret; +} + +static void RTL8201CP_mdio_write(AwEmacState *s, uint8_t addr, uint8_t reg, + uint16_t value) +{ + RTL8201CPState *mii = &s->mii; + NetClientState *nc; + + if (addr == s->phy_addr) { + switch (reg) { + case MII_BMCR: + if (value & MII_BMCR_RESET) { + nc = qemu_get_queue(s->nic); + mii_reset(mii, !nc->link_down); + } else { + mii->bmcr = value; + } + break; + case MII_ANAR: + mii->anar = value; + break; + case MII_BMSR: + case MII_PHYID1: + case MII_PHYID2: + case MII_ANLPAR: + case MII_ANER: + qemu_log_mask(LOG_GUEST_ERROR, + "allwinner_emac: write to read-only mii reg 0x%x\n", + reg); + break; + case MII_NSR: + case MII_LBREMR: + case MII_REC: + case MII_SNRDR: + case MII_TEST: + qemu_log_mask(LOG_UNIMP, + "allwinner_emac: write to unimpl. mii reg 0x%x\n", + reg); + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "allwinner_emac: write to invalid mii reg 0x%x\n", + reg); + } + } +} + +static void aw_emac_update_irq(AwEmacState *s) +{ + qemu_set_irq(s->irq, (s->int_sta & s->int_ctl) != 0); +} + +static void aw_emac_tx_reset(AwEmacState *s, int chan) +{ + fifo8_reset(&s->tx_fifo[chan]); + s->tx_length[chan] = 0; +} + +static void aw_emac_rx_reset(AwEmacState *s) +{ + fifo8_reset(&s->rx_fifo); + s->rx_num_packets = 0; + s->rx_packet_size = 0; + s->rx_packet_pos = 0; +} + +static void fifo8_push_word(Fifo8 *fifo, uint32_t val) +{ + fifo8_push(fifo, val); + fifo8_push(fifo, val >> 8); + fifo8_push(fifo, val >> 16); + fifo8_push(fifo, val >> 24); +} + +static uint32_t fifo8_pop_word(Fifo8 *fifo) +{ + uint32_t ret; + + ret = fifo8_pop(fifo); + ret |= fifo8_pop(fifo) << 8; + ret |= fifo8_pop(fifo) << 16; + ret |= fifo8_pop(fifo) << 24; + + return ret; +} + +static int aw_emac_can_receive(NetClientState *nc) +{ + AwEmacState *s = qemu_get_nic_opaque(nc); + + /* + * To avoid packet drops, allow reception only when there is space + * for a full frame: 1522 + 8 (rx headers) + 2 (padding). + */ + return (s->ctl & EMAC_CTL_RX_EN) && (fifo8_num_free(&s->rx_fifo) >= 1532); +} + +static ssize_t aw_emac_receive(NetClientState *nc, const uint8_t *buf, + size_t size) +{ + AwEmacState *s = qemu_get_nic_opaque(nc); + Fifo8 *fifo = &s->rx_fifo; + size_t padded_size, total_size; + uint32_t crc; + + padded_size = size > 60 ? size : 60; + total_size = QEMU_ALIGN_UP(RX_HDR_SIZE + padded_size + CRC_SIZE, 4); + + if (!(s->ctl & EMAC_CTL_RX_EN) || (fifo8_num_free(fifo) < total_size)) { + return -1; + } + + fifo8_push_word(fifo, EMAC_UNDOCUMENTED_MAGIC); + fifo8_push_word(fifo, EMAC_RX_HEADER(padded_size + CRC_SIZE, + EMAC_RX_IO_DATA_STATUS_OK)); + fifo8_push_all(fifo, buf, size); + crc = crc32(~0, buf, size); + + if (padded_size != size) { + fifo8_push_all(fifo, padding, padded_size - size); + crc = crc32(crc, padding, padded_size - size); + } + + fifo8_push_word(fifo, crc); + fifo8_push_all(fifo, padding, QEMU_ALIGN_UP(padded_size, 4) - padded_size); + s->rx_num_packets++; + + s->int_sta |= EMAC_INT_RX; + aw_emac_update_irq(s); + + return size; +} + +static void aw_emac_reset(DeviceState *dev) +{ + AwEmacState *s = AW_EMAC(dev); + NetClientState *nc = qemu_get_queue(s->nic); + + s->ctl = 0; + s->tx_mode = 0; + s->int_ctl = 0; + s->int_sta = 0; + s->tx_channel = 0; + s->phy_target = 0; + + aw_emac_tx_reset(s, 0); + aw_emac_tx_reset(s, 1); + aw_emac_rx_reset(s); + + mii_reset(&s->mii, !nc->link_down); +} + +static uint64_t aw_emac_read(void *opaque, hwaddr offset, unsigned size) +{ + AwEmacState *s = opaque; + Fifo8 *fifo = &s->rx_fifo; + NetClientState *nc; + uint64_t ret; + + switch (offset) { + case EMAC_CTL_REG: + return s->ctl; + case EMAC_TX_MODE_REG: + return s->tx_mode; + case EMAC_TX_INS_REG: + return s->tx_channel; + case EMAC_RX_CTL_REG: + return s->rx_ctl; + case EMAC_RX_IO_DATA_REG: + if (!s->rx_num_packets) { + qemu_log_mask(LOG_GUEST_ERROR, + "Read IO data register when no packet available"); + return 0; + } + + ret = fifo8_pop_word(fifo); + + switch (s->rx_packet_pos) { + case 0: /* Word is magic header */ + s->rx_packet_pos += 4; + break; + case 4: /* Word is rx info header */ + s->rx_packet_pos += 4; + s->rx_packet_size = QEMU_ALIGN_UP(extract32(ret, 0, 16), 4); + break; + default: /* Word is packet data */ + s->rx_packet_pos += 4; + s->rx_packet_size -= 4; + + if (!s->rx_packet_size) { + s->rx_packet_pos = 0; + s->rx_num_packets--; + nc = qemu_get_queue(s->nic); + if (aw_emac_can_receive(nc)) { + qemu_flush_queued_packets(nc); + } + } + } + return ret; + case EMAC_RX_FBC_REG: + return s->rx_num_packets; + case EMAC_INT_CTL_REG: + return s->int_ctl; + case EMAC_INT_STA_REG: + return s->int_sta; + case EMAC_MAC_MRDD_REG: + return RTL8201CP_mdio_read(s, + extract32(s->phy_target, PHY_ADDR_SHIFT, 8), + extract32(s->phy_target, PHY_REG_SHIFT, 8)); + default: + qemu_log_mask(LOG_UNIMP, + "allwinner_emac: read access to unknown register 0x" + TARGET_FMT_plx "\n", offset); + ret = 0; + } + + return ret; +} + +static void aw_emac_write(void *opaque, hwaddr offset, uint64_t value, + unsigned size) +{ + AwEmacState *s = opaque; + Fifo8 *fifo; + NetClientState *nc = qemu_get_queue(s->nic); + int chan; + + switch (offset) { + case EMAC_CTL_REG: + if (value & EMAC_CTL_RESET) { + aw_emac_reset(DEVICE(s)); + value &= ~EMAC_CTL_RESET; + } + s->ctl = value; + if (aw_emac_can_receive(nc)) { + qemu_flush_queued_packets(nc); + } + break; + case EMAC_TX_MODE_REG: + s->tx_mode = value; + break; + case EMAC_TX_CTL0_REG: + case EMAC_TX_CTL1_REG: + chan = (offset == EMAC_TX_CTL0_REG ? 0 : 1); + if ((value & 1) && (s->ctl & EMAC_CTL_TX_EN)) { + uint32_t len, ret; + const uint8_t *data; + + fifo = &s->tx_fifo[chan]; + len = s->tx_length[chan]; + + if (len > fifo8_num_used(fifo)) { + len = fifo8_num_used(fifo); + qemu_log_mask(LOG_GUEST_ERROR, + "allwinner_emac: TX length > fifo data length\n"); + } + if (len > 0) { + data = fifo8_pop_buf(fifo, len, &ret); + qemu_send_packet(nc, data, ret); + aw_emac_tx_reset(s, chan); + /* Raise TX interrupt */ + s->int_sta |= EMAC_INT_TX_CHAN(chan); + aw_emac_update_irq(s); + } + } + break; + case EMAC_TX_INS_REG: + s->tx_channel = value < NUM_TX_FIFOS ? value : 0; + break; + case EMAC_TX_PL0_REG: + case EMAC_TX_PL1_REG: + chan = (offset == EMAC_TX_PL0_REG ? 0 : 1); + if (value > TX_FIFO_SIZE) { + qemu_log_mask(LOG_GUEST_ERROR, + "allwinner_emac: invalid TX frame length %d\n", + (int)value); + value = TX_FIFO_SIZE; + } + s->tx_length[chan] = value; + break; + case EMAC_TX_IO_DATA_REG: + fifo = &s->tx_fifo[s->tx_channel]; + if (fifo8_num_free(fifo) < 4) { + qemu_log_mask(LOG_GUEST_ERROR, + "allwinner_emac: TX data overruns fifo\n"); + break; + } + fifo8_push_word(fifo, value); + break; + case EMAC_RX_CTL_REG: + s->rx_ctl = value; + break; + case EMAC_RX_FBC_REG: + if (value == 0) { + aw_emac_rx_reset(s); + } + break; + case EMAC_INT_CTL_REG: + s->int_ctl = value; + aw_emac_update_irq(s); + break; + case EMAC_INT_STA_REG: + s->int_sta &= ~value; + aw_emac_update_irq(s); + break; + case EMAC_MAC_MADR_REG: + s->phy_target = value; + break; + case EMAC_MAC_MWTD_REG: + RTL8201CP_mdio_write(s, extract32(s->phy_target, PHY_ADDR_SHIFT, 8), + extract32(s->phy_target, PHY_REG_SHIFT, 8), value); + break; + default: + qemu_log_mask(LOG_UNIMP, + "allwinner_emac: write access to unknown register 0x" + TARGET_FMT_plx "\n", offset); + } +} + +static void aw_emac_set_link(NetClientState *nc) +{ + AwEmacState *s = qemu_get_nic_opaque(nc); + + mii_set_link(&s->mii, !nc->link_down); +} + +static const MemoryRegionOps aw_emac_mem_ops = { + .read = aw_emac_read, + .write = aw_emac_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + .min_access_size = 4, + .max_access_size = 4, + }, +}; + +static NetClientInfo net_aw_emac_info = { + .type = NET_CLIENT_OPTIONS_KIND_NIC, + .size = sizeof(NICState), + .can_receive = aw_emac_can_receive, + .receive = aw_emac_receive, + .link_status_changed = aw_emac_set_link, +}; + +static void aw_emac_init(Object *obj) +{ + SysBusDevice *sbd = SYS_BUS_DEVICE(obj); + AwEmacState *s = AW_EMAC(obj); + + memory_region_init_io(&s->iomem, OBJECT(s), &aw_emac_mem_ops, s, + "aw_emac", 0x1000); + sysbus_init_mmio(sbd, &s->iomem); + sysbus_init_irq(sbd, &s->irq); +} + +static void aw_emac_realize(DeviceState *dev, Error **errp) +{ + AwEmacState *s = AW_EMAC(dev); + + qemu_macaddr_default_if_unset(&s->conf.macaddr); + s->nic = qemu_new_nic(&net_aw_emac_info, &s->conf, + object_get_typename(OBJECT(dev)), dev->id, s); + qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a); + + fifo8_create(&s->rx_fifo, RX_FIFO_SIZE); + fifo8_create(&s->tx_fifo[0], TX_FIFO_SIZE); + fifo8_create(&s->tx_fifo[1], TX_FIFO_SIZE); +} + +static Property aw_emac_properties[] = { + DEFINE_NIC_PROPERTIES(AwEmacState, conf), + DEFINE_PROP_UINT8("phy-addr", AwEmacState, phy_addr, 0), + DEFINE_PROP_END_OF_LIST(), +}; + +static const VMStateDescription vmstate_mii = { + .name = "rtl8201cp", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT16(bmcr, RTL8201CPState), + VMSTATE_UINT16(bmsr, RTL8201CPState), + VMSTATE_UINT16(anar, RTL8201CPState), + VMSTATE_UINT16(anlpar, RTL8201CPState), + VMSTATE_END_OF_LIST() + } +}; + +static int aw_emac_post_load(void *opaque, int version_id) +{ + AwEmacState *s = opaque; + + aw_emac_set_link(qemu_get_queue(s->nic)); + + return 0; +} + +static const VMStateDescription vmstate_aw_emac = { + .name = "allwinner_emac", + .version_id = 1, + .minimum_version_id = 1, + .post_load = aw_emac_post_load, + .fields = (VMStateField[]) { + VMSTATE_STRUCT(mii, AwEmacState, 1, vmstate_mii, RTL8201CPState), + VMSTATE_UINT32(ctl, AwEmacState), + VMSTATE_UINT32(tx_mode, AwEmacState), + VMSTATE_UINT32(rx_ctl, AwEmacState), + VMSTATE_UINT32(int_ctl, AwEmacState), + VMSTATE_UINT32(int_sta, AwEmacState), + VMSTATE_UINT32(phy_target, AwEmacState), + VMSTATE_FIFO8(rx_fifo, AwEmacState), + VMSTATE_UINT32(rx_num_packets, AwEmacState), + VMSTATE_UINT32(rx_packet_size, AwEmacState), + VMSTATE_UINT32(rx_packet_pos, AwEmacState), + VMSTATE_STRUCT_ARRAY(tx_fifo, AwEmacState, NUM_TX_FIFOS, 1, + vmstate_fifo8, Fifo8), + VMSTATE_UINT32_ARRAY(tx_length, AwEmacState, NUM_TX_FIFOS), + VMSTATE_UINT32(tx_channel, AwEmacState), + VMSTATE_END_OF_LIST() + } +}; + +static void aw_emac_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->realize = aw_emac_realize; + dc->props = aw_emac_properties; + dc->reset = aw_emac_reset; + dc->vmsd = &vmstate_aw_emac; +} + +static const TypeInfo aw_emac_info = { + .name = TYPE_AW_EMAC, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(AwEmacState), + .instance_init = aw_emac_init, + .class_init = aw_emac_class_init, +}; + +static void aw_emac_register_types(void) +{ + type_register_static(&aw_emac_info); +} + +type_init(aw_emac_register_types) |
