root / hw / milkymist-minimac2.c @ 6e625fc7
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/*
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* QEMU model of the Milkymist minimac2 block.
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*
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* Copyright (c) 2011 Michael Walle <michael@walle.cc>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*
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* Specification available at:
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* not available yet
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*
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*/
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#include "hw.h" |
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#include "sysbus.h" |
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#include "trace.h" |
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#include "net.h" |
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#include "qemu-error.h" |
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#include "qdev-addr.h" |
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#include <zlib.h> |
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enum {
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R_SETUP = 0,
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R_MDIO, |
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R_STATE0, |
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R_COUNT0, |
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R_STATE1, |
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R_COUNT1, |
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R_TXCOUNT, |
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R_MAX |
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}; |
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enum {
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SETUP_PHY_RST = (1<<0), |
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}; |
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enum {
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MDIO_DO = (1<<0), |
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MDIO_DI = (1<<1), |
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MDIO_OE = (1<<2), |
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MDIO_CLK = (1<<3), |
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}; |
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enum {
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STATE_EMPTY = 0,
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STATE_LOADED = 1,
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STATE_PENDING = 2,
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}; |
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enum {
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MDIO_OP_WRITE = 1,
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MDIO_OP_READ = 2,
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}; |
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enum mdio_state {
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MDIO_STATE_IDLE, |
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MDIO_STATE_READING, |
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MDIO_STATE_WRITING, |
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}; |
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enum {
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R_PHY_ID1 = 2,
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R_PHY_ID2 = 3,
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R_PHY_MAX = 32
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}; |
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#define MINIMAC2_MTU 1530 |
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#define MINIMAC2_BUFFER_SIZE 2048 |
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struct MilkymistMinimac2MdioState {
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int last_clk;
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int count;
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uint32_t data; |
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uint16_t data_out; |
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int state;
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uint8_t phy_addr; |
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uint8_t reg_addr; |
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}; |
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typedef struct MilkymistMinimac2MdioState MilkymistMinimac2MdioState; |
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struct MilkymistMinimac2State {
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SysBusDevice busdev; |
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NICState *nic; |
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NICConf conf; |
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char *phy_model;
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target_phys_addr_t buffers_base; |
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qemu_irq rx_irq; |
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qemu_irq tx_irq; |
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uint32_t regs[R_MAX]; |
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MilkymistMinimac2MdioState mdio; |
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uint16_t phy_regs[R_PHY_MAX]; |
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uint8_t *rx0_buf; |
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uint8_t *rx1_buf; |
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uint8_t *tx_buf; |
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}; |
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typedef struct MilkymistMinimac2State MilkymistMinimac2State; |
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|
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static const uint8_t preamble_sfd[] = { |
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0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0xd5 |
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}; |
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static void minimac2_mdio_write_reg(MilkymistMinimac2State *s, |
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uint8_t phy_addr, uint8_t reg_addr, uint16_t value) |
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{ |
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trace_milkymist_minimac2_mdio_write(phy_addr, reg_addr, value); |
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/* nop */
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} |
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static uint16_t minimac2_mdio_read_reg(MilkymistMinimac2State *s,
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uint8_t phy_addr, uint8_t reg_addr) |
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{ |
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uint16_t r = s->phy_regs[reg_addr]; |
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trace_milkymist_minimac2_mdio_read(phy_addr, reg_addr, r); |
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return r;
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} |
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static void minimac2_update_mdio(MilkymistMinimac2State *s) |
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{ |
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MilkymistMinimac2MdioState *m = &s->mdio; |
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/* detect rising clk edge */
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if (m->last_clk == 0 && (s->regs[R_MDIO] & MDIO_CLK)) { |
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/* shift data in */
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int bit = ((s->regs[R_MDIO] & MDIO_DO)
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&& (s->regs[R_MDIO] & MDIO_OE)) ? 1 : 0; |
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m->data = (m->data << 1) | bit;
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/* check for sync */
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if (m->data == 0xffffffff) { |
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m->count = 32;
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} |
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if (m->count == 16) { |
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uint8_t start = (m->data >> 14) & 0x3; |
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uint8_t op = (m->data >> 12) & 0x3; |
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uint8_t ta = (m->data) & 0x3;
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if (start == 1 && op == MDIO_OP_WRITE && ta == 2) { |
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m->state = MDIO_STATE_WRITING; |
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} else if (start == 1 && op == MDIO_OP_READ && (ta & 1) == 0) { |
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m->state = MDIO_STATE_READING; |
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} else {
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m->state = MDIO_STATE_IDLE; |
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} |
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if (m->state != MDIO_STATE_IDLE) {
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m->phy_addr = (m->data >> 7) & 0x1f; |
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m->reg_addr = (m->data >> 2) & 0x1f; |
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} |
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if (m->state == MDIO_STATE_READING) {
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m->data_out = minimac2_mdio_read_reg(s, m->phy_addr, |
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m->reg_addr); |
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} |
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} |
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if (m->count < 16 && m->state == MDIO_STATE_READING) { |
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int bit = (m->data_out & 0x8000) ? 1 : 0; |
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m->data_out <<= 1;
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if (bit) {
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s->regs[R_MDIO] |= MDIO_DI; |
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} else {
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s->regs[R_MDIO] &= ~MDIO_DI; |
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} |
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} |
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if (m->count == 0 && m->state) { |
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if (m->state == MDIO_STATE_WRITING) {
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uint16_t data = m->data & 0xffff;
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minimac2_mdio_write_reg(s, m->phy_addr, m->reg_addr, data); |
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} |
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m->state = MDIO_STATE_IDLE; |
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} |
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m->count--; |
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} |
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m->last_clk = (s->regs[R_MDIO] & MDIO_CLK) ? 1 : 0; |
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} |
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static size_t assemble_frame(uint8_t *buf, size_t size,
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const uint8_t *payload, size_t payload_size)
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{ |
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uint32_t crc; |
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if (size < payload_size + 12) { |
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error_report("milkymist_minimac2: received too big ethernet frame");
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return 0; |
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} |
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/* prepend preamble and sfd */
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memcpy(buf, preamble_sfd, 8);
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/* now copy the payload */
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memcpy(buf + 8, payload, payload_size);
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/* pad frame if needed */
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if (payload_size < 60) { |
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memset(buf + payload_size + 8, 0, 60 - payload_size); |
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payload_size = 60;
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} |
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/* append fcs */
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crc = cpu_to_le32(crc32(0, buf + 8, payload_size)); |
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memcpy(buf + payload_size + 8, &crc, 4); |
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return payload_size + 12; |
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} |
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static void minimac2_tx(MilkymistMinimac2State *s) |
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{ |
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uint32_t txcount = s->regs[R_TXCOUNT]; |
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uint8_t *buf = s->tx_buf; |
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if (txcount < 64) { |
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error_report("milkymist_minimac2: ethernet frame too small (%u < %u)\n",
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txcount, 64);
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goto err;
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} |
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if (txcount > MINIMAC2_MTU) {
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error_report("milkymist_minimac2: MTU exceeded (%u > %u)\n",
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txcount, MINIMAC2_MTU); |
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goto err;
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} |
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if (memcmp(buf, preamble_sfd, 8) != 0) { |
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error_report("milkymist_minimac2: frame doesn't contain the preamble "
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"and/or the SFD (%02x %02x %02x %02x %02x %02x %02x %02x)\n",
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]); |
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goto err;
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} |
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trace_milkymist_minimac2_tx_frame(txcount - 12);
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/* send packet, skipping preamble and sfd */
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qemu_send_packet_raw(&s->nic->nc, buf + 8, txcount - 12); |
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s->regs[R_TXCOUNT] = 0;
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err:
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trace_milkymist_minimac2_pulse_irq_tx(); |
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qemu_irq_pulse(s->tx_irq); |
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} |
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static void update_rx_interrupt(MilkymistMinimac2State *s) |
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{ |
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if (s->regs[R_STATE0] == STATE_PENDING
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|| s->regs[R_STATE1] == STATE_PENDING) { |
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trace_milkymist_minimac2_raise_irq_rx(); |
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qemu_irq_raise(s->rx_irq); |
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} else {
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trace_milkymist_minimac2_lower_irq_rx(); |
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qemu_irq_lower(s->rx_irq); |
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} |
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} |
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static ssize_t minimac2_rx(VLANClientState *nc, const uint8_t *buf, size_t size) |
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{ |
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MilkymistMinimac2State *s = DO_UPCAST(NICState, nc, nc)->opaque; |
282 |
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uint32_t r_count; |
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uint32_t r_state; |
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uint8_t *rx_buf; |
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size_t frame_size; |
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trace_milkymist_minimac2_rx_frame(buf, size); |
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/* choose appropriate slot */
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if (s->regs[R_STATE0] == STATE_LOADED) {
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r_count = R_COUNT0; |
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r_state = R_STATE0; |
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rx_buf = s->rx0_buf; |
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} else if (s->regs[R_STATE1] == STATE_LOADED) { |
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r_count = R_COUNT1; |
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r_state = R_STATE1; |
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rx_buf = s->rx1_buf; |
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} else {
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trace_milkymist_minimac2_drop_rx_frame(buf); |
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return size;
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} |
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/* assemble frame */
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frame_size = assemble_frame(rx_buf, MINIMAC2_BUFFER_SIZE, buf, size); |
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if (frame_size == 0) { |
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return size;
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} |
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trace_milkymist_minimac2_rx_transfer(rx_buf, frame_size); |
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/* update slot */
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s->regs[r_count] = frame_size; |
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s->regs[r_state] = STATE_PENDING; |
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update_rx_interrupt(s); |
319 |
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return size;
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} |
322 |
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static uint32_t
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minimac2_read(void *opaque, target_phys_addr_t addr)
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{ |
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MilkymistMinimac2State *s = opaque; |
327 |
uint32_t r = 0;
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addr >>= 2;
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switch (addr) {
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case R_SETUP:
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case R_MDIO:
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case R_STATE0:
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case R_COUNT0:
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case R_STATE1:
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case R_COUNT1:
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case R_TXCOUNT:
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r = s->regs[addr]; |
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break;
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default:
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error_report("milkymist_minimac2: read access to unknown register 0x"
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TARGET_FMT_plx, addr << 2);
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break;
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} |
346 |
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trace_milkymist_minimac2_memory_read(addr << 2, r);
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return r;
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} |
351 |
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static void |
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minimac2_write(void *opaque, target_phys_addr_t addr, uint32_t value)
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{ |
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MilkymistMinimac2State *s = opaque; |
356 |
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357 |
trace_milkymist_minimac2_memory_read(addr, value); |
358 |
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359 |
addr >>= 2;
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360 |
switch (addr) {
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361 |
case R_MDIO:
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362 |
{ |
363 |
/* MDIO_DI is read only */
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364 |
int mdio_di = (s->regs[R_MDIO] & MDIO_DI);
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s->regs[R_MDIO] = value; |
366 |
if (mdio_di) {
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367 |
s->regs[R_MDIO] |= mdio_di; |
368 |
} else {
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369 |
s->regs[R_MDIO] &= ~mdio_di; |
370 |
} |
371 |
|
372 |
minimac2_update_mdio(s); |
373 |
} break;
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374 |
case R_TXCOUNT:
|
375 |
s->regs[addr] = value; |
376 |
if (value > 0) { |
377 |
minimac2_tx(s); |
378 |
} |
379 |
break;
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380 |
case R_STATE0:
|
381 |
case R_STATE1:
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382 |
s->regs[addr] = value; |
383 |
update_rx_interrupt(s); |
384 |
break;
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385 |
case R_SETUP:
|
386 |
case R_COUNT0:
|
387 |
case R_COUNT1:
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388 |
s->regs[addr] = value; |
389 |
break;
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390 |
|
391 |
default:
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392 |
error_report("milkymist_minimac2: write access to unknown register 0x"
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TARGET_FMT_plx, addr << 2);
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394 |
break;
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395 |
} |
396 |
} |
397 |
|
398 |
static CPUReadMemoryFunc * const minimac2_read_fn[] = { |
399 |
NULL,
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400 |
NULL,
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&minimac2_read, |
402 |
}; |
403 |
|
404 |
static CPUWriteMemoryFunc * const minimac2_write_fn[] = { |
405 |
NULL,
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406 |
NULL,
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&minimac2_write, |
408 |
}; |
409 |
|
410 |
static int minimac2_can_rx(VLANClientState *nc) |
411 |
{ |
412 |
MilkymistMinimac2State *s = DO_UPCAST(NICState, nc, nc)->opaque; |
413 |
|
414 |
if (s->regs[R_STATE0] == STATE_LOADED) {
|
415 |
return 1; |
416 |
} |
417 |
if (s->regs[R_STATE1] == STATE_LOADED) {
|
418 |
return 1; |
419 |
} |
420 |
|
421 |
return 0; |
422 |
} |
423 |
|
424 |
static void minimac2_cleanup(VLANClientState *nc) |
425 |
{ |
426 |
MilkymistMinimac2State *s = DO_UPCAST(NICState, nc, nc)->opaque; |
427 |
|
428 |
s->nic = NULL;
|
429 |
} |
430 |
|
431 |
static void milkymist_minimac2_reset(DeviceState *d) |
432 |
{ |
433 |
MilkymistMinimac2State *s = |
434 |
container_of(d, MilkymistMinimac2State, busdev.qdev); |
435 |
int i;
|
436 |
|
437 |
for (i = 0; i < R_MAX; i++) { |
438 |
s->regs[i] = 0;
|
439 |
} |
440 |
for (i = 0; i < R_PHY_MAX; i++) { |
441 |
s->phy_regs[i] = 0;
|
442 |
} |
443 |
|
444 |
/* defaults */
|
445 |
s->phy_regs[R_PHY_ID1] = 0x0022; /* Micrel KSZ8001L */ |
446 |
s->phy_regs[R_PHY_ID2] = 0x161a;
|
447 |
} |
448 |
|
449 |
static NetClientInfo net_milkymist_minimac2_info = {
|
450 |
.type = NET_CLIENT_TYPE_NIC, |
451 |
.size = sizeof(NICState),
|
452 |
.can_receive = minimac2_can_rx, |
453 |
.receive = minimac2_rx, |
454 |
.cleanup = minimac2_cleanup, |
455 |
}; |
456 |
|
457 |
static int milkymist_minimac2_init(SysBusDevice *dev) |
458 |
{ |
459 |
MilkymistMinimac2State *s = FROM_SYSBUS(typeof(*s), dev); |
460 |
int regs;
|
461 |
ram_addr_t buffers; |
462 |
size_t buffers_size = TARGET_PAGE_ALIGN(3 * MINIMAC2_BUFFER_SIZE);
|
463 |
|
464 |
sysbus_init_irq(dev, &s->rx_irq); |
465 |
sysbus_init_irq(dev, &s->tx_irq); |
466 |
|
467 |
regs = cpu_register_io_memory(minimac2_read_fn, minimac2_write_fn, s, |
468 |
DEVICE_NATIVE_ENDIAN); |
469 |
sysbus_init_mmio(dev, R_MAX * 4, regs);
|
470 |
|
471 |
/* register buffers memory */
|
472 |
buffers = qemu_ram_alloc(NULL, "milkymist_minimac2.buffers", buffers_size); |
473 |
s->rx0_buf = qemu_get_ram_ptr(buffers); |
474 |
s->rx1_buf = s->rx0_buf + MINIMAC2_BUFFER_SIZE; |
475 |
s->tx_buf = s->rx1_buf + MINIMAC2_BUFFER_SIZE; |
476 |
|
477 |
cpu_register_physical_memory(s->buffers_base, buffers_size, |
478 |
buffers | IO_MEM_RAM); |
479 |
|
480 |
qemu_macaddr_default_if_unset(&s->conf.macaddr); |
481 |
s->nic = qemu_new_nic(&net_milkymist_minimac2_info, &s->conf, |
482 |
dev->qdev.info->name, dev->qdev.id, s); |
483 |
qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a); |
484 |
|
485 |
return 0; |
486 |
} |
487 |
|
488 |
static const VMStateDescription vmstate_milkymist_minimac2_mdio = { |
489 |
.name = "milkymist-minimac2-mdio",
|
490 |
.version_id = 1,
|
491 |
.minimum_version_id = 1,
|
492 |
.minimum_version_id_old = 1,
|
493 |
.fields = (VMStateField[]) { |
494 |
VMSTATE_INT32(last_clk, MilkymistMinimac2MdioState), |
495 |
VMSTATE_INT32(count, MilkymistMinimac2MdioState), |
496 |
VMSTATE_UINT32(data, MilkymistMinimac2MdioState), |
497 |
VMSTATE_UINT16(data_out, MilkymistMinimac2MdioState), |
498 |
VMSTATE_INT32(state, MilkymistMinimac2MdioState), |
499 |
VMSTATE_UINT8(phy_addr, MilkymistMinimac2MdioState), |
500 |
VMSTATE_UINT8(reg_addr, MilkymistMinimac2MdioState), |
501 |
VMSTATE_END_OF_LIST() |
502 |
} |
503 |
}; |
504 |
|
505 |
static const VMStateDescription vmstate_milkymist_minimac2 = { |
506 |
.name = "milkymist-minimac2",
|
507 |
.version_id = 1,
|
508 |
.minimum_version_id = 1,
|
509 |
.minimum_version_id_old = 1,
|
510 |
.fields = (VMStateField[]) { |
511 |
VMSTATE_UINT32_ARRAY(regs, MilkymistMinimac2State, R_MAX), |
512 |
VMSTATE_UINT16_ARRAY(phy_regs, MilkymistMinimac2State, R_PHY_MAX), |
513 |
VMSTATE_STRUCT(mdio, MilkymistMinimac2State, 0,
|
514 |
vmstate_milkymist_minimac2_mdio, MilkymistMinimac2MdioState), |
515 |
VMSTATE_END_OF_LIST() |
516 |
} |
517 |
}; |
518 |
|
519 |
static SysBusDeviceInfo milkymist_minimac2_info = {
|
520 |
.init = milkymist_minimac2_init, |
521 |
.qdev.name = "milkymist-minimac2",
|
522 |
.qdev.size = sizeof(MilkymistMinimac2State),
|
523 |
.qdev.vmsd = &vmstate_milkymist_minimac2, |
524 |
.qdev.reset = milkymist_minimac2_reset, |
525 |
.qdev.props = (Property[]) { |
526 |
DEFINE_PROP_TADDR("buffers_base", MilkymistMinimac2State,
|
527 |
buffers_base, 0),
|
528 |
DEFINE_NIC_PROPERTIES(MilkymistMinimac2State, conf), |
529 |
DEFINE_PROP_STRING("phy_model", MilkymistMinimac2State, phy_model),
|
530 |
DEFINE_PROP_END_OF_LIST(), |
531 |
} |
532 |
}; |
533 |
|
534 |
static void milkymist_minimac2_register(void) |
535 |
{ |
536 |
sysbus_register_withprop(&milkymist_minimac2_info); |
537 |
} |
538 |
|
539 |
device_init(milkymist_minimac2_register) |