31da45ce04
The "fall through" added by the commit is clearly intentional. Mark it so. Hushes up Coverity. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
274 lines
7.8 KiB
C
274 lines
7.8 KiB
C
/*
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* QEMU model of the Xilinx Ethernet Lite MAC.
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*
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* Copyright (c) 2009 Edgar E. Iglesias.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw/sysbus.h"
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#include "hw/hw.h"
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#include "net/net.h"
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#define D(x)
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#define R_TX_BUF0 0
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#define R_TX_LEN0 (0x07f4 / 4)
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#define R_TX_GIE0 (0x07f8 / 4)
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#define R_TX_CTRL0 (0x07fc / 4)
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#define R_TX_BUF1 (0x0800 / 4)
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#define R_TX_LEN1 (0x0ff4 / 4)
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#define R_TX_CTRL1 (0x0ffc / 4)
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#define R_RX_BUF0 (0x1000 / 4)
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#define R_RX_CTRL0 (0x17fc / 4)
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#define R_RX_BUF1 (0x1800 / 4)
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#define R_RX_CTRL1 (0x1ffc / 4)
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#define R_MAX (0x2000 / 4)
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#define GIE_GIE 0x80000000
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#define CTRL_I 0x8
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#define CTRL_P 0x2
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#define CTRL_S 0x1
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#define TYPE_XILINX_ETHLITE "xlnx.xps-ethernetlite"
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#define XILINX_ETHLITE(obj) \
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OBJECT_CHECK(struct xlx_ethlite, (obj), TYPE_XILINX_ETHLITE)
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struct xlx_ethlite
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{
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SysBusDevice parent_obj;
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MemoryRegion mmio;
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qemu_irq irq;
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NICState *nic;
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NICConf conf;
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uint32_t c_tx_pingpong;
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uint32_t c_rx_pingpong;
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unsigned int txbuf;
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unsigned int rxbuf;
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uint32_t regs[R_MAX];
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};
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static inline void eth_pulse_irq(struct xlx_ethlite *s)
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{
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/* Only the first gie reg is active. */
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if (s->regs[R_TX_GIE0] & GIE_GIE) {
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qemu_irq_pulse(s->irq);
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}
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}
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static uint64_t
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eth_read(void *opaque, hwaddr addr, unsigned int size)
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{
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struct xlx_ethlite *s = opaque;
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uint32_t r = 0;
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addr >>= 2;
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switch (addr)
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{
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case R_TX_GIE0:
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case R_TX_LEN0:
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case R_TX_LEN1:
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case R_TX_CTRL1:
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case R_TX_CTRL0:
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case R_RX_CTRL1:
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case R_RX_CTRL0:
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r = s->regs[addr];
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D(qemu_log("%s " TARGET_FMT_plx "=%x\n", __func__, addr * 4, r));
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break;
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default:
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r = tswap32(s->regs[addr]);
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break;
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}
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return r;
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}
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static void
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eth_write(void *opaque, hwaddr addr,
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uint64_t val64, unsigned int size)
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{
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struct xlx_ethlite *s = opaque;
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unsigned int base = 0;
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uint32_t value = val64;
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addr >>= 2;
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switch (addr)
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{
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case R_TX_CTRL0:
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case R_TX_CTRL1:
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if (addr == R_TX_CTRL1)
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base = 0x800 / 4;
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D(qemu_log("%s addr=" TARGET_FMT_plx " val=%x\n",
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__func__, addr * 4, value));
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if ((value & (CTRL_P | CTRL_S)) == CTRL_S) {
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qemu_send_packet(qemu_get_queue(s->nic),
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(void *) &s->regs[base],
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s->regs[base + R_TX_LEN0]);
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D(qemu_log("eth_tx %d\n", s->regs[base + R_TX_LEN0]));
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if (s->regs[base + R_TX_CTRL0] & CTRL_I)
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eth_pulse_irq(s);
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} else if ((value & (CTRL_P | CTRL_S)) == (CTRL_P | CTRL_S)) {
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memcpy(&s->conf.macaddr.a[0], &s->regs[base], 6);
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if (s->regs[base + R_TX_CTRL0] & CTRL_I)
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eth_pulse_irq(s);
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}
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/* We are fast and get ready pretty much immediately so
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we actually never flip the S nor P bits to one. */
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s->regs[addr] = value & ~(CTRL_P | CTRL_S);
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break;
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/* Keep these native. */
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case R_RX_CTRL0:
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case R_RX_CTRL1:
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if (!(value & CTRL_S)) {
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qemu_flush_queued_packets(qemu_get_queue(s->nic));
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}
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/* fall through */
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case R_TX_LEN0:
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case R_TX_LEN1:
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case R_TX_GIE0:
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D(qemu_log("%s addr=" TARGET_FMT_plx " val=%x\n",
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__func__, addr * 4, value));
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s->regs[addr] = value;
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break;
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default:
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s->regs[addr] = tswap32(value);
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break;
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}
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}
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static const MemoryRegionOps eth_ops = {
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.read = eth_read,
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.write = eth_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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.valid = {
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.min_access_size = 4,
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.max_access_size = 4
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}
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};
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static int eth_can_rx(NetClientState *nc)
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{
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struct xlx_ethlite *s = qemu_get_nic_opaque(nc);
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unsigned int rxbase = s->rxbuf * (0x800 / 4);
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return !(s->regs[rxbase + R_RX_CTRL0] & CTRL_S);
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}
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static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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struct xlx_ethlite *s = qemu_get_nic_opaque(nc);
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unsigned int rxbase = s->rxbuf * (0x800 / 4);
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/* DA filter. */
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if (!(buf[0] & 0x80) && memcmp(&s->conf.macaddr.a[0], buf, 6))
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return size;
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if (s->regs[rxbase + R_RX_CTRL0] & CTRL_S) {
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D(qemu_log("ethlite lost packet %x\n", s->regs[R_RX_CTRL0]));
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return -1;
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}
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D(qemu_log("%s %zd rxbase=%x\n", __func__, size, rxbase));
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memcpy(&s->regs[rxbase + R_RX_BUF0], buf, size);
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s->regs[rxbase + R_RX_CTRL0] |= CTRL_S;
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if (s->regs[R_RX_CTRL0] & CTRL_I) {
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eth_pulse_irq(s);
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}
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/* If c_rx_pingpong was set flip buffers. */
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s->rxbuf ^= s->c_rx_pingpong;
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return size;
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}
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static void xilinx_ethlite_reset(DeviceState *dev)
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{
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struct xlx_ethlite *s = XILINX_ETHLITE(dev);
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s->rxbuf = 0;
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}
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static NetClientInfo net_xilinx_ethlite_info = {
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.type = NET_CLIENT_OPTIONS_KIND_NIC,
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.size = sizeof(NICState),
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.can_receive = eth_can_rx,
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.receive = eth_rx,
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};
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static void xilinx_ethlite_realize(DeviceState *dev, Error **errp)
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{
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struct xlx_ethlite *s = XILINX_ETHLITE(dev);
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qemu_macaddr_default_if_unset(&s->conf.macaddr);
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s->nic = qemu_new_nic(&net_xilinx_ethlite_info, &s->conf,
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object_get_typename(OBJECT(dev)), dev->id, s);
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qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
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}
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static void xilinx_ethlite_init(Object *obj)
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{
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struct xlx_ethlite *s = XILINX_ETHLITE(obj);
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sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
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memory_region_init_io(&s->mmio, obj, ð_ops, s,
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"xlnx.xps-ethernetlite", R_MAX * 4);
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sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
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}
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static Property xilinx_ethlite_properties[] = {
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DEFINE_PROP_UINT32("tx-ping-pong", struct xlx_ethlite, c_tx_pingpong, 1),
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DEFINE_PROP_UINT32("rx-ping-pong", struct xlx_ethlite, c_rx_pingpong, 1),
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DEFINE_NIC_PROPERTIES(struct xlx_ethlite, conf),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void xilinx_ethlite_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = xilinx_ethlite_realize;
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dc->reset = xilinx_ethlite_reset;
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dc->props = xilinx_ethlite_properties;
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}
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static const TypeInfo xilinx_ethlite_info = {
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.name = TYPE_XILINX_ETHLITE,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(struct xlx_ethlite),
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.instance_init = xilinx_ethlite_init,
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.class_init = xilinx_ethlite_class_init,
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};
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static void xilinx_ethlite_register_types(void)
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{
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type_register_static(&xilinx_ethlite_info);
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}
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type_init(xilinx_ethlite_register_types)
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