LXR qemu/hw/net/xilinx

   1/*
   2 * QEMU model of the Xilinx Ethernet Lite MAC.
   3 *
   4 * Copyright (c) 2009 Edgar E. Iglesias.
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "qemu/osdep.h"
  26#include "qemu/module.h"
  27#include "qom/object.h"
  28#include "cpu.h" /* FIXME should not use tswap* */
  29#include "hw/sysbus.h"
  30#include "hw/irq.h"
  31#include "hw/qdev-properties.h"
  32#include "net/net.h"
  33
  34#define D(x)
  35#define R_TX_BUF0     0
  36#define R_TX_LEN0     (0x07f4 / 4)
  37#define R_TX_GIE0     (0x07f8 / 4)
  38#define R_TX_CTRL0    (0x07fc / 4)
  39#define R_TX_BUF1     (0x0800 / 4)
  40#define R_TX_LEN1     (0x0ff4 / 4)
  41#define R_TX_CTRL1    (0x0ffc / 4)
  42
  43#define R_RX_BUF0     (0x1000 / 4)
  44#define R_RX_CTRL0    (0x17fc / 4)
  45#define R_RX_BUF1     (0x1800 / 4)
  46#define R_RX_CTRL1    (0x1ffc / 4)
  47#define R_MAX         (0x2000 / 4)
  48
  49#define GIE_GIE    0x80000000
  50
  51#define CTRL_I     0x8
  52#define CTRL_P     0x2
  53#define CTRL_S     0x1
  54
  55#define TYPE_XILINX_ETHLITE "xlnx.xps-ethernetlite"
  56DECLARE_INSTANCE_CHECKER(struct xlx_ethlite, XILINX_ETHLITE,
  57                         TYPE_XILINX_ETHLITE)
  58
  59struct xlx_ethlite
  60{
  61    SysBusDevice parent_obj;
  62
  63    MemoryRegion mmio;
  64    qemu_irq irq;
  65    NICState *nic;
  66    NICConf conf;
  67
  68    uint32_t c_tx_pingpong;
  69    uint32_t c_rx_pingpong;
  70    unsigned int txbuf;
  71    unsigned int rxbuf;
  72
  73    uint32_t regs[R_MAX];
  74};
  75
  76static inline void eth_pulse_irq(struct xlx_ethlite *s)
  77{
  78    /* Only the first gie reg is active.  */
  79    if (s->regs[R_TX_GIE0] & GIE_GIE) {
  80        qemu_irq_pulse(s->irq);
  81    }
  82}
  83
  84static uint64_t
  85eth_read(void *opaque, hwaddr addr, unsigned int size)
  86{
  87    struct xlx_ethlite *s = opaque;
  88    uint32_t r = 0;
  89
  90    addr >>= 2;
  91
  92    switch (addr)
  93    {
  94        case R_TX_GIE0:
  95        case R_TX_LEN0:
  96        case R_TX_LEN1:
  97        case R_TX_CTRL1:
  98        case R_TX_CTRL0:
  99        case R_RX_CTRL1:
 100        case R_RX_CTRL0:
 101            r = s->regs[addr];
 102            D(qemu_log("%s " TARGET_FMT_plx "=%x\n", __func__, addr * 4, r));
 103            break;
 104
 105        default:
 106            r = tswap32(s->regs[addr]);
 107            break;
 108    }
 109    return r;
 110}
 111
 112static void
 113eth_write(void *opaque, hwaddr addr,
 114          uint64_t val64, unsigned int size)
 115{
 116    struct xlx_ethlite *s = opaque;
 117    unsigned int base = 0;
 118    uint32_t value = val64;
 119
 120    addr >>= 2;
 121    switch (addr) 
 122    {
 123        case R_TX_CTRL0:
 124        case R_TX_CTRL1:
 125            if (addr == R_TX_CTRL1)
 126                base = 0x800 / 4;
 127
 128            D(qemu_log("%s addr=" TARGET_FMT_plx " val=%x\n",
 129                       __func__, addr * 4, value));
 130            if ((value & (CTRL_P | CTRL_S)) == CTRL_S) {
 131                qemu_send_packet(qemu_get_queue(s->nic),
 132                                 (void *) &s->regs[base],
 133                                 s->regs[base + R_TX_LEN0]);
 134                D(qemu_log("eth_tx %d\n", s->regs[base + R_TX_LEN0]));
 135                if (s->regs[base + R_TX_CTRL0] & CTRL_I)
 136                    eth_pulse_irq(s);
 137            } else if ((value & (CTRL_P | CTRL_S)) == (CTRL_P | CTRL_S)) {
 138                memcpy(&s->conf.macaddr.a[0], &s->regs[base], 6);
 139                if (s->regs[base + R_TX_CTRL0] & CTRL_I)
 140                    eth_pulse_irq(s);
 141            }
 142
 143            /* We are fast and get ready pretty much immediately so
 144               we actually never flip the S nor P bits to one.  */
 145            s->regs[addr] = value & ~(CTRL_P | CTRL_S);
 146            break;
 147
 148        /* Keep these native.  */
 149        case R_RX_CTRL0:
 150        case R_RX_CTRL1:
 151            if (!(value & CTRL_S)) {
 152                qemu_flush_queued_packets(qemu_get_queue(s->nic));
 153            }
 154            /* fall through */
 155        case R_TX_LEN0:
 156        case R_TX_LEN1:
 157        case R_TX_GIE0:
 158            D(qemu_log("%s addr=" TARGET_FMT_plx " val=%x\n",
 159                       __func__, addr * 4, value));
 160            s->regs[addr] = value;
 161            break;
 162
 163        default:
 164            s->regs[addr] = tswap32(value);
 165            break;
 166    }
 167}
 168
 169static const MemoryRegionOps eth_ops = {
 170    .read = eth_read,
 171    .write = eth_write,
 172    .endianness = DEVICE_NATIVE_ENDIAN,
 173    .valid = {
 174        .min_access_size = 4,
 175        .max_access_size = 4
 176    }
 177};
 178
 179static bool eth_can_rx(NetClientState *nc)
 180{
 181    struct xlx_ethlite *s = qemu_get_nic_opaque(nc);
 182    unsigned int rxbase = s->rxbuf * (0x800 / 4);
 183
 184    return !(s->regs[rxbase + R_RX_CTRL0] & CTRL_S);
 185}
 186
 187static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size)
 188{
 189    struct xlx_ethlite *s = qemu_get_nic_opaque(nc);
 190    unsigned int rxbase = s->rxbuf * (0x800 / 4);
 191
 192    /* DA filter.  */
 193    if (!(buf[0] & 0x80) && memcmp(&s->conf.macaddr.a[0], buf, 6))
 194        return size;
 195
 196    if (s->regs[rxbase + R_RX_CTRL0] & CTRL_S) {
 197        D(qemu_log("ethlite lost packet %x\n", s->regs[R_RX_CTRL0]));
 198        return -1;
 199    }
 200
 201    D(qemu_log("%s %zd rxbase=%x\n", __func__, size, rxbase));
 202    if (size > (R_MAX - R_RX_BUF0 - rxbase) * 4) {
 203        D(qemu_log("ethlite packet is too big, size=%x\n", size));
 204        return -1;
 205    }
 206    memcpy(&s->regs[rxbase + R_RX_BUF0], buf, size);
 207
 208    s->regs[rxbase + R_RX_CTRL0] |= CTRL_S;
 209    if (s->regs[R_RX_CTRL0] & CTRL_I) {
 210        eth_pulse_irq(s);
 211    }
 212
 213    /* If c_rx_pingpong was set flip buffers.  */
 214    s->rxbuf ^= s->c_rx_pingpong;
 215    return size;
 216}
 217
 218static void xilinx_ethlite_reset(DeviceState *dev)
 219{
 220    struct xlx_ethlite *s = XILINX_ETHLITE(dev);
 221
 222    s->rxbuf = 0;
 223}
 224
 225static NetClientInfo net_xilinx_ethlite_info = {
 226    .type = NET_CLIENT_DRIVER_NIC,
 227    .size = sizeof(NICState),
 228    .can_receive = eth_can_rx,
 229    .receive = eth_rx,
 230};
 231
 232static void xilinx_ethlite_realize(DeviceState *dev, Error **errp)
 233{
 234    struct xlx_ethlite *s = XILINX_ETHLITE(dev);
 235
 236    qemu_macaddr_default_if_unset(&s->conf.macaddr);
 237    s->nic = qemu_new_nic(&net_xilinx_ethlite_info, &s->conf,
 238                          object_get_typename(OBJECT(dev)), dev->id, s);
 239    qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
 240}
 241
 242static void xilinx_ethlite_init(Object *obj)
 243{
 244    struct xlx_ethlite *s = XILINX_ETHLITE(obj);
 245
 246    sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
 247
 248    memory_region_init_io(&s->mmio, obj, &eth_ops, s,
 249                          "xlnx.xps-ethernetlite", R_MAX * 4);
 250    sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
 251}
 252
 253static Property xilinx_ethlite_properties[] = {
 254    DEFINE_PROP_UINT32("tx-ping-pong", struct xlx_ethlite, c_tx_pingpong, 1),
 255    DEFINE_PROP_UINT32("rx-ping-pong", struct xlx_ethlite, c_rx_pingpong, 1),
 256    DEFINE_NIC_PROPERTIES(struct xlx_ethlite, conf),
 257    DEFINE_PROP_END_OF_LIST(),
 258};
 259
 260static void xilinx_ethlite_class_init(ObjectClass *klass, void *data)
 261{
 262    DeviceClass *dc = DEVICE_CLASS(klass);
 263
 264    dc->realize = xilinx_ethlite_realize;
 265    dc->reset = xilinx_ethlite_reset;
 266    device_class_set_props(dc, xilinx_ethlite_properties);
 267}
 268
 269static const TypeInfo xilinx_ethlite_info = {
 270    .name          = TYPE_XILINX_ETHLITE,
 271    .parent        = TYPE_SYS_BUS_DEVICE,
 272    .instance_size = sizeof(struct xlx_ethlite),
 273    .instance_init = xilinx_ethlite_init,
 274    .class_init    = xilinx_ethlite_class_init,
 275};
 276
 277static void xilinx_ethlite_register_types(void)
 278{
 279    type_register_static(&xilinx_ethlite_info);
 280}
 281
 282type_init(xilinx_ethlite_register_types)
 283