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/* |
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* Copyright (C) 2005-2007 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_dec21143.c,v 1.28 2007/01/05 15:20:06 debug Exp $ |
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* |
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* DEC 21143 ("Tulip") ethernet controller. Implemented from Intel document |
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* 278074-001 ("21143 PC/CardBus 10/100Mb/s Ethernet LAN Controller") and by |
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* reverse-engineering OpenBSD and NetBSD sources. |
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* |
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* This device emulates several sub-components: |
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* |
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* 21143: This is the actual ethernet controller. |
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* |
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* MII: The "physical" network interface. |
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* |
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* SROM: A ROM area containing setting such as which MAC address to |
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* use, and info about the MII. |
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* |
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* |
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* TODO: |
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* o) Handle _writes_ to MII registers. |
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* o) Make it work with modern Linux kernels (as a guest OS). |
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* o) Endianness for descriptors? If necessary. |
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* o) Actually handle the "Setup" packet. |
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* o) MAC filtering on incoming packets. |
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* o) Don't hardcode as many values. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "cpu.h" |
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#include "device.h" |
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#include "devices.h" |
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#include "emul.h" |
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#include "interrupt.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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#include "net.h" |
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|
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#include "mii.h" |
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#include "tulipreg.h" |
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|
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|
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/* #define debug fatal */ |
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|
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#define DEC21143_TICK_SHIFT 16 |
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|
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#define N_REGS 32 |
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#define ROM_WIDTH 6 |
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|
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struct dec21143_data { |
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struct interrupt irq; |
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int irq_was_asserted; |
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|
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/* PCI: */ |
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int pci_little_endian; |
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|
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/* Ethernet address, and a network which we are connected to: */ |
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uint8_t mac[6]; |
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struct net *net; |
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|
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/* SROM emulation: */ |
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uint8_t srom[1 << (ROM_WIDTH + 1)]; |
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int srom_curbit; |
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int srom_opcode; |
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int srom_opcode_has_started; |
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int srom_addr; |
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|
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/* MII PHY emulation: */ |
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uint16_t mii_phy_reg[MII_NPHY * 32]; |
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int mii_state; |
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int mii_bit; |
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int mii_opcode; |
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int mii_phyaddr; |
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int mii_regaddr; |
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|
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/* 21143 registers: */ |
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uint32_t reg[N_REGS]; |
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|
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/* Internal TX state: */ |
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uint64_t cur_tx_addr; |
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unsigned char *cur_tx_buf; |
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int cur_tx_buf_len; |
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int tx_idling; |
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int tx_idling_threshold; |
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|
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/* Internal RX state: */ |
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uint64_t cur_rx_addr; |
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unsigned char *cur_rx_buf; |
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int cur_rx_buf_len; |
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int cur_rx_offset; |
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}; |
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|
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|
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/* Internal states during MII data stream decode: */ |
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#define MII_STATE_RESET 0 |
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#define MII_STATE_START_WAIT 1 |
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#define MII_STATE_READ_OP 2 |
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#define MII_STATE_READ_PHYADDR_REGADDR 3 |
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#define MII_STATE_A 4 |
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#define MII_STATE_D 5 |
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#define MII_STATE_IDLE 6 |
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|
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|
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/* |
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* dec21143_rx(): |
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* |
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* Receive a packet. (If there is no current packet, then check for newly |
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* arrived ones. If the current packet couldn't be fully transfered the |
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* last time, then continue on that packet.) |
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*/ |
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int dec21143_rx(struct cpu *cpu, struct dec21143_data *d) |
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{ |
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uint64_t addr = d->cur_rx_addr, bufaddr; |
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unsigned char descr[16]; |
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uint32_t rdes0, rdes1, rdes2, rdes3; |
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int bufsize, buf1_size, buf2_size, i, writeback_len = 4, to_xfer; |
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|
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/* No current packet? Then check for new ones. */ |
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if (d->cur_rx_buf == NULL) { |
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/* Nothing available? Then abort. */ |
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if (!net_ethernet_rx_avail(d->net, d)) |
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return 0; |
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|
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/* Get the next packet into our buffer: */ |
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net_ethernet_rx(d->net, d, &d->cur_rx_buf, |
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&d->cur_rx_buf_len); |
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|
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/* Append a 4 byte CRC: */ |
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d->cur_rx_buf_len += 4; |
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d->cur_rx_buf = realloc(d->cur_rx_buf, d->cur_rx_buf_len); |
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if (d->cur_rx_buf == NULL) { |
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fatal("dec21143_rx(): out of memory\n"); |
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exit(1); |
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} |
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/* Well... the CRC is just zeros, for now. */ |
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memset(d->cur_rx_buf + d->cur_rx_buf_len - 4, 0, 4); |
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|
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d->cur_rx_offset = 0; |
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} |
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|
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/* fatal("{ dec21143_rx: base = 0x%08x }\n", (int)addr); */ |
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addr &= 0x7fffffff; |
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|
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if (!cpu->memory_rw(cpu, cpu->mem, addr, descr, sizeof(uint32_t), |
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MEM_READ, PHYSICAL | NO_EXCEPTIONS)) { |
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fatal("[ dec21143_rx: memory_rw failed! ]\n"); |
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return 0; |
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} |
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|
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rdes0 = descr[0] + (descr[1]<<8) + (descr[2]<<16) + (descr[3]<<24); |
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|
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/* Only use descriptors owned by the 21143: */ |
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if (!(rdes0 & TDSTAT_OWN)) { |
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d->reg[CSR_STATUS/8] |= STATUS_RU; |
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return 0; |
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} |
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|
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if (!cpu->memory_rw(cpu, cpu->mem, addr + sizeof(uint32_t), descr + |
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sizeof(uint32_t), sizeof(uint32_t) * 3, MEM_READ, PHYSICAL | |
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NO_EXCEPTIONS)) { |
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fatal("[ dec21143_rx: memory_rw failed! ]\n"); |
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return 0; |
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} |
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|
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rdes1 = descr[4] + (descr[5]<<8) + (descr[6]<<16) + (descr[7]<<24); |
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rdes2 = descr[8] + (descr[9]<<8) + (descr[10]<<16) + (descr[11]<<24); |
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rdes3 = descr[12] + (descr[13]<<8) + (descr[14]<<16) + (descr[15]<<24); |
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|
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buf1_size = rdes1 & TDCTL_SIZE1; |
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buf2_size = (rdes1 & TDCTL_SIZE2) >> TDCTL_SIZE2_SHIFT; |
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bufaddr = buf1_size? rdes2 : rdes3; |
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bufsize = buf1_size? buf1_size : buf2_size; |
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|
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d->reg[CSR_STATUS/8] &= ~STATUS_RS; |
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|
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if (rdes1 & TDCTL_ER) |
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d->cur_rx_addr = d->reg[CSR_RXLIST / 8]; |
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else { |
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if (rdes1 & TDCTL_CH) |
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d->cur_rx_addr = rdes3; |
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else |
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d->cur_rx_addr += 4 * sizeof(uint32_t); |
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} |
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|
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debug("{ RX (%llx): 0x%08x 0x%08x 0x%x 0x%x: buf %i bytes at 0x%x }\n", |
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(long long)addr, rdes0, rdes1, rdes2, rdes3, bufsize, (int)bufaddr); |
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bufaddr &= 0x7fffffff; |
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|
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/* Turn off all status bits, and give up ownership: */ |
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rdes0 = 0x00000000; |
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|
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to_xfer = d->cur_rx_buf_len - d->cur_rx_offset; |
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if (to_xfer > bufsize) |
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to_xfer = bufsize; |
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|
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/* DMA bytes from the packet into emulated physical memory: */ |
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for (i=0; i<to_xfer; i++) { |
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cpu->memory_rw(cpu, cpu->mem, bufaddr + i, |
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d->cur_rx_buf + d->cur_rx_offset + i, 1, MEM_WRITE, |
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PHYSICAL | NO_EXCEPTIONS); |
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/* fatal(" %02x", d->cur_rx_buf[d->cur_rx_offset + i]); */ |
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} |
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|
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/* Was this the first buffer in a frame? Then mark it as such. */ |
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if (d->cur_rx_offset == 0) |
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rdes0 |= TDSTAT_Rx_FS; |
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|
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d->cur_rx_offset += to_xfer; |
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|
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/* Frame completed? */ |
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if (d->cur_rx_offset >= d->cur_rx_buf_len) { |
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rdes0 |= TDSTAT_Rx_LS; |
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|
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/* Set the frame length: */ |
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rdes0 |= (d->cur_rx_buf_len << 16) & TDSTAT_Rx_FL; |
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|
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/* Frame too long? (1518 is max ethernet frame length) */ |
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if (d->cur_rx_buf_len > 1518) |
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rdes0 |= TDSTAT_Rx_TL; |
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|
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/* Cause a receiver interrupt: */ |
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d->reg[CSR_STATUS/8] |= STATUS_RI; |
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|
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free(d->cur_rx_buf); |
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d->cur_rx_buf = NULL; |
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d->cur_rx_buf_len = 0; |
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} |
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|
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/* Descriptor writeback: */ |
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descr[ 0] = rdes0; descr[ 1] = rdes0 >> 8; |
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descr[ 2] = rdes0 >> 16; descr[ 3] = rdes0 >> 24; |
260 |
if (writeback_len > 1) { |
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descr[ 4] = rdes1; descr[ 5] = rdes1 >> 8; |
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descr[ 6] = rdes1 >> 16; descr[ 7] = rdes1 >> 24; |
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descr[ 8] = rdes2; descr[ 9] = rdes2 >> 8; |
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descr[10] = rdes2 >> 16; descr[11] = rdes2 >> 24; |
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descr[12] = rdes3; descr[13] = rdes3 >> 8; |
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descr[14] = rdes3 >> 16; descr[15] = rdes3 >> 24; |
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} |
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|
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if (!cpu->memory_rw(cpu, cpu->mem, addr, descr, sizeof(uint32_t) |
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* writeback_len, MEM_WRITE, PHYSICAL | NO_EXCEPTIONS)) { |
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fatal("[ dec21143_rx: memory_rw failed! ]\n"); |
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return 0; |
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} |
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|
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return 1; |
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} |
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|
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|
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/* |
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* dec21143_tx(): |
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* |
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* Transmit a packet, if the guest OS has marked a descriptor as containing |
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* data to transmit. |
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*/ |
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int dec21143_tx(struct cpu *cpu, struct dec21143_data *d) |
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{ |
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uint64_t addr = d->cur_tx_addr, bufaddr; |
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unsigned char descr[16]; |
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uint32_t tdes0, tdes1, tdes2, tdes3; |
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int bufsize, buf1_size, buf2_size, i, writeback_len = 4; |
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|
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addr &= 0x7fffffff; |
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|
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if (!cpu->memory_rw(cpu, cpu->mem, addr, descr, sizeof(uint32_t), |
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MEM_READ, PHYSICAL | NO_EXCEPTIONS)) { |
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fatal("[ dec21143_tx: memory_rw failed! ]\n"); |
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return 0; |
298 |
} |
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|
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tdes0 = descr[0] + (descr[1]<<8) + (descr[2]<<16) + (descr[3]<<24); |
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|
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/* fatal("{ dec21143_tx: base=0x%08x, tdes0=0x%08x }\n", |
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(int)addr, (int)tdes0); */ |
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|
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/* Only process packets owned by the 21143: */ |
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if (!(tdes0 & TDSTAT_OWN)) { |
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if (d->tx_idling > d->tx_idling_threshold) { |
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d->reg[CSR_STATUS/8] |= STATUS_TU; |
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d->tx_idling = 0; |
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} else |
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d->tx_idling ++; |
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return 0; |
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} |
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|
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if (!cpu->memory_rw(cpu, cpu->mem, addr + sizeof(uint32_t), descr + |
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sizeof(uint32_t), sizeof(uint32_t) * 3, MEM_READ, PHYSICAL | |
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NO_EXCEPTIONS)) { |
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fatal("[ dec21143_tx: memory_rw failed! ]\n"); |
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return 0; |
320 |
} |
321 |
|
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tdes1 = descr[4] + (descr[5]<<8) + (descr[6]<<16) + (descr[7]<<24); |
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tdes2 = descr[8] + (descr[9]<<8) + (descr[10]<<16) + (descr[11]<<24); |
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tdes3 = descr[12] + (descr[13]<<8) + (descr[14]<<16) + (descr[15]<<24); |
325 |
|
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buf1_size = tdes1 & TDCTL_SIZE1; |
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buf2_size = (tdes1 & TDCTL_SIZE2) >> TDCTL_SIZE2_SHIFT; |
328 |
bufaddr = buf1_size? tdes2 : tdes3; |
329 |
bufsize = buf1_size? buf1_size : buf2_size; |
330 |
|
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d->reg[CSR_STATUS/8] &= ~STATUS_TS; |
332 |
|
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if (tdes1 & TDCTL_ER) |
334 |
d->cur_tx_addr = d->reg[CSR_TXLIST / 8]; |
335 |
else { |
336 |
if (tdes1 & TDCTL_CH) |
337 |
d->cur_tx_addr = tdes3; |
338 |
else |
339 |
d->cur_tx_addr += 4 * sizeof(uint32_t); |
340 |
} |
341 |
|
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/* |
343 |
fatal("{ TX (%llx): 0x%08x 0x%08x 0x%x 0x%x: buf %i bytes at 0x%x }\n", |
344 |
(long long)addr, tdes0, tdes1, tdes2, tdes3, bufsize, (int)bufaddr); |
345 |
*/ |
346 |
bufaddr &= 0x7fffffff; |
347 |
|
348 |
/* Assume no error: */ |
349 |
tdes0 &= ~ (TDSTAT_Tx_UF | TDSTAT_Tx_EC | TDSTAT_Tx_LC |
350 |
| TDSTAT_Tx_NC | TDSTAT_Tx_LO | TDSTAT_Tx_TO | TDSTAT_ES); |
351 |
|
352 |
if (tdes1 & TDCTL_Tx_SET) { |
353 |
/* |
354 |
* Setup Packet. |
355 |
* |
356 |
* TODO. For now, just ignore it, and pretend it worked. |
357 |
*/ |
358 |
/* fatal("{ TX: setup packet }\n"); */ |
359 |
if (bufsize != 192) |
360 |
fatal("[ dec21143: setup packet len = %i, should be" |
361 |
" 192! ]\n", (int)bufsize); |
362 |
if (tdes1 & TDCTL_Tx_IC) |
363 |
d->reg[CSR_STATUS/8] |= STATUS_TI; |
364 |
/* New descriptor values, according to the docs: */ |
365 |
tdes0 = 0x7fffffff; tdes1 = 0xffffffff; |
366 |
tdes2 = 0xffffffff; tdes3 = 0xffffffff; |
367 |
} else { |
368 |
/* |
369 |
* Data Packet. |
370 |
*/ |
371 |
/* fatal("{ TX: data packet: "); */ |
372 |
if (tdes1 & TDCTL_Tx_FS) { |
373 |
/* First segment. Let's allocate a new buffer: */ |
374 |
/* fatal("new frame }\n"); */ |
375 |
d->cur_tx_buf = malloc(bufsize); |
376 |
d->cur_tx_buf_len = 0; |
377 |
} else { |
378 |
/* Not first segment. Increase the length of |
379 |
the current buffer: */ |
380 |
/* fatal("continuing last frame }\n"); */ |
381 |
d->cur_tx_buf = realloc(d->cur_tx_buf, |
382 |
d->cur_tx_buf_len + bufsize); |
383 |
} |
384 |
|
385 |
if (d->cur_tx_buf == NULL) { |
386 |
fatal("dec21143_tx(): out of memory\n"); |
387 |
exit(1); |
388 |
} |
389 |
|
390 |
/* "DMA" data from emulated physical memory into the buf: */ |
391 |
for (i=0; i<bufsize; i++) { |
392 |
cpu->memory_rw(cpu, cpu->mem, bufaddr + i, |
393 |
d->cur_tx_buf + d->cur_tx_buf_len + i, 1, MEM_READ, |
394 |
PHYSICAL | NO_EXCEPTIONS); |
395 |
/* fatal(" %02x", d->cur_tx_buf[ |
396 |
d->cur_tx_buf_len + i]); */ |
397 |
} |
398 |
|
399 |
d->cur_tx_buf_len += bufsize; |
400 |
|
401 |
/* Last segment? Then actually transmit it: */ |
402 |
if (tdes1 & TDCTL_Tx_LS) { |
403 |
/* fatal("{ TX: data frame complete. }\n"); */ |
404 |
if (d->net != NULL) { |
405 |
net_ethernet_tx(d->net, d, d->cur_tx_buf, |
406 |
d->cur_tx_buf_len); |
407 |
} else { |
408 |
static int warn = 0; |
409 |
if (!warn) |
410 |
fatal("[ dec21143: WARNING! Not " |
411 |
"connected to a network! ]\n"); |
412 |
warn = 1; |
413 |
} |
414 |
|
415 |
free(d->cur_tx_buf); |
416 |
d->cur_tx_buf = NULL; |
417 |
d->cur_tx_buf_len = 0; |
418 |
|
419 |
/* TODO: Shouldn't the OWN bit be cleared on all |
420 |
kinds of segments, not just the Last? */ |
421 |
|
422 |
/* We are done. */ |
423 |
tdes0 &= ~TDSTAT_OWN; |
424 |
writeback_len = 1; |
425 |
|
426 |
/* Interrupt, if Tx_IC is set: */ |
427 |
if (tdes1 & TDCTL_Tx_IC) |
428 |
d->reg[CSR_STATUS/8] |= STATUS_TI; |
429 |
} |
430 |
} |
431 |
|
432 |
/* Error summary: */ |
433 |
if (tdes0 & (TDSTAT_Tx_UF | TDSTAT_Tx_EC | TDSTAT_Tx_LC |
434 |
| TDSTAT_Tx_NC | TDSTAT_Tx_LO | TDSTAT_Tx_TO)) |
435 |
tdes0 |= TDSTAT_ES; |
436 |
|
437 |
/* Descriptor writeback: */ |
438 |
descr[ 0] = tdes0; descr[ 1] = tdes0 >> 8; |
439 |
descr[ 2] = tdes0 >> 16; descr[ 3] = tdes0 >> 24; |
440 |
if (writeback_len > 1) { |
441 |
descr[ 4] = tdes1; descr[ 5] = tdes1 >> 8; |
442 |
descr[ 6] = tdes1 >> 16; descr[ 7] = tdes1 >> 24; |
443 |
descr[ 8] = tdes2; descr[ 9] = tdes2 >> 8; |
444 |
descr[10] = tdes2 >> 16; descr[11] = tdes2 >> 24; |
445 |
descr[12] = tdes3; descr[13] = tdes3 >> 8; |
446 |
descr[14] = tdes3 >> 16; descr[15] = tdes3 >> 24; |
447 |
} |
448 |
|
449 |
if (!cpu->memory_rw(cpu, cpu->mem, addr, descr, sizeof(uint32_t) |
450 |
* writeback_len, MEM_WRITE, PHYSICAL | NO_EXCEPTIONS)) { |
451 |
fatal("[ dec21143_tx: memory_rw failed! ]\n"); |
452 |
return 0; |
453 |
} |
454 |
|
455 |
return 1; |
456 |
} |
457 |
|
458 |
|
459 |
/* |
460 |
* dev_dec21143_tick(): |
461 |
*/ |
462 |
void dev_dec21143_tick(struct cpu *cpu, void *extra) |
463 |
{ |
464 |
struct dec21143_data *d = extra; |
465 |
int asserted; |
466 |
|
467 |
if (d->reg[CSR_OPMODE / 8] & OPMODE_ST) |
468 |
while (dec21143_tx(cpu, d)) |
469 |
; |
470 |
|
471 |
if (d->reg[CSR_OPMODE / 8] & OPMODE_SR) |
472 |
while (dec21143_rx(cpu, d)) |
473 |
; |
474 |
|
475 |
/* Normal and Abnormal interrupt summary: */ |
476 |
d->reg[CSR_STATUS / 8] &= ~(STATUS_NIS | STATUS_AIS); |
477 |
if (d->reg[CSR_STATUS / 8] & 0x00004845) |
478 |
d->reg[CSR_STATUS / 8] |= STATUS_NIS; |
479 |
if (d->reg[CSR_STATUS / 8] & 0x0c0037ba) |
480 |
d->reg[CSR_STATUS / 8] |= STATUS_AIS; |
481 |
|
482 |
asserted = d->reg[CSR_STATUS / 8] & d->reg[CSR_INTEN / 8] & 0x0c01ffff; |
483 |
|
484 |
if (asserted) |
485 |
INTERRUPT_ASSERT(d->irq); |
486 |
if (!asserted && d->irq_was_asserted) |
487 |
INTERRUPT_DEASSERT(d->irq); |
488 |
|
489 |
/* Remember assertion flag: */ |
490 |
d->irq_was_asserted = asserted; |
491 |
} |
492 |
|
493 |
|
494 |
/* |
495 |
* mii_access(): |
496 |
* |
497 |
* This function handles accesses to the MII. Data streams seem to be of the |
498 |
* following format: |
499 |
* |
500 |
* vv---- starting delimiter |
501 |
* ... 01 xx yyyyy zzzzz a[a] dddddddddddddddd |
502 |
* ^---- I am starting with mii_bit = 0 here |
503 |
* |
504 |
* where x = opcode (10 = read, 01 = write) |
505 |
* y = PHY address |
506 |
* z = register address |
507 |
* a = on Reads: ACK bit (returned, should be 0) |
508 |
* on Writes: _TWO_ dummy bits (10) |
509 |
* d = 16 bits of data (MSB first) |
510 |
*/ |
511 |
static void mii_access(struct cpu *cpu, struct dec21143_data *d, |
512 |
uint32_t oldreg, uint32_t idata) |
513 |
{ |
514 |
int obit, ibit = 0; |
515 |
uint16_t tmp; |
516 |
|
517 |
/* Only care about data during clock cycles: */ |
518 |
if (!(idata & MIIROM_MDC)) |
519 |
return; |
520 |
|
521 |
if (idata & MIIROM_MDC && oldreg & MIIROM_MDC) |
522 |
return; |
523 |
|
524 |
/* fatal("[ mii_access(): 0x%08x ]\n", (int)idata); */ |
525 |
|
526 |
if (idata & MIIROM_BR) { |
527 |
fatal("[ mii_access(): MIIROM_BR: TODO ]\n"); |
528 |
return; |
529 |
} |
530 |
|
531 |
obit = idata & MIIROM_MDO? 1 : 0; |
532 |
|
533 |
if (d->mii_state >= MII_STATE_START_WAIT && |
534 |
d->mii_state <= MII_STATE_READ_PHYADDR_REGADDR && |
535 |
idata & MIIROM_MIIDIR) |
536 |
fatal("[ mii_access(): bad dir? ]\n"); |
537 |
|
538 |
switch (d->mii_state) { |
539 |
|
540 |
case MII_STATE_RESET: |
541 |
/* Wait for a starting delimiter (0 followed by 1). */ |
542 |
if (obit) |
543 |
return; |
544 |
if (idata & MIIROM_MIIDIR) |
545 |
return; |
546 |
/* fatal("[ mii_access(): got a 0 delimiter ]\n"); */ |
547 |
d->mii_state = MII_STATE_START_WAIT; |
548 |
d->mii_opcode = 0; |
549 |
d->mii_phyaddr = 0; |
550 |
d->mii_regaddr = 0; |
551 |
break; |
552 |
|
553 |
case MII_STATE_START_WAIT: |
554 |
/* Wait for a starting delimiter (0 followed by 1). */ |
555 |
if (!obit) |
556 |
return; |
557 |
if (idata & MIIROM_MIIDIR) { |
558 |
d->mii_state = MII_STATE_RESET; |
559 |
return; |
560 |
} |
561 |
/* fatal("[ mii_access(): got a 1 delimiter ]\n"); */ |
562 |
d->mii_state = MII_STATE_READ_OP; |
563 |
d->mii_bit = 0; |
564 |
break; |
565 |
|
566 |
case MII_STATE_READ_OP: |
567 |
if (d->mii_bit == 0) { |
568 |
d->mii_opcode = obit << 1; |
569 |
/* fatal("[ mii_access(): got first opcode bit " |
570 |
"(%i) ]\n", obit); */ |
571 |
} else { |
572 |
d->mii_opcode |= obit; |
573 |
/* fatal("[ mii_access(): got opcode = %i ]\n", |
574 |
d->mii_opcode); */ |
575 |
d->mii_state = MII_STATE_READ_PHYADDR_REGADDR; |
576 |
} |
577 |
d->mii_bit ++; |
578 |
break; |
579 |
|
580 |
case MII_STATE_READ_PHYADDR_REGADDR: |
581 |
/* fatal("[ mii_access(): got phy/reg addr bit nr %i (%i)" |
582 |
" ]\n", d->mii_bit - 2, obit); */ |
583 |
if (d->mii_bit <= 6) |
584 |
d->mii_phyaddr |= obit << (6-d->mii_bit); |
585 |
else |
586 |
d->mii_regaddr |= obit << (11-d->mii_bit); |
587 |
d->mii_bit ++; |
588 |
if (d->mii_bit >= 12) { |
589 |
/* fatal("[ mii_access(): phyaddr=0x%x regaddr=0x" |
590 |
"%x ]\n", d->mii_phyaddr, d->mii_regaddr); */ |
591 |
d->mii_state = MII_STATE_A; |
592 |
} |
593 |
break; |
594 |
|
595 |
case MII_STATE_A: |
596 |
switch (d->mii_opcode) { |
597 |
case MII_COMMAND_WRITE: |
598 |
if (d->mii_bit >= 13) |
599 |
d->mii_state = MII_STATE_D; |
600 |
break; |
601 |
case MII_COMMAND_READ: |
602 |
ibit = 0; |
603 |
d->mii_state = MII_STATE_D; |
604 |
break; |
605 |
default:debug("[ mii_access(): UNIMPLEMENTED MII opcode " |
606 |
"%i (probably just a bug in GXemul's " |
607 |
"MII data stream handling) ]\n", d->mii_opcode); |
608 |
d->mii_state = MII_STATE_RESET; |
609 |
} |
610 |
d->mii_bit ++; |
611 |
break; |
612 |
|
613 |
case MII_STATE_D: |
614 |
switch (d->mii_opcode) { |
615 |
case MII_COMMAND_WRITE: |
616 |
if (idata & MIIROM_MIIDIR) |
617 |
fatal("[ mii_access(): write: bad dir? ]\n"); |
618 |
obit = obit? (0x8000 >> (d->mii_bit - 14)) : 0; |
619 |
tmp = d->mii_phy_reg[(d->mii_phyaddr << 5) + |
620 |
d->mii_regaddr] | obit; |
621 |
if (d->mii_bit >= 29) { |
622 |
d->mii_state = MII_STATE_IDLE; |
623 |
debug("[ mii_access(): WRITE to phyaddr=0x%x " |
624 |
"regaddr=0x%x: 0x%04x ]\n", d->mii_phyaddr, |
625 |
d->mii_regaddr, tmp); |
626 |
} |
627 |
break; |
628 |
case MII_COMMAND_READ: |
629 |
if (!(idata & MIIROM_MIIDIR)) |
630 |
break; |
631 |
tmp = d->mii_phy_reg[(d->mii_phyaddr << 5) + |
632 |
d->mii_regaddr]; |
633 |
if (d->mii_bit == 13) |
634 |
debug("[ mii_access(): READ phyaddr=0x%x " |
635 |
"regaddr=0x%x: 0x%04x ]\n", d->mii_phyaddr, |
636 |
d->mii_regaddr, tmp); |
637 |
ibit = tmp & (0x8000 >> (d->mii_bit - 13)); |
638 |
if (d->mii_bit >= 28) |
639 |
d->mii_state = MII_STATE_IDLE; |
640 |
break; |
641 |
} |
642 |
d->mii_bit ++; |
643 |
break; |
644 |
|
645 |
case MII_STATE_IDLE: |
646 |
d->mii_bit ++; |
647 |
if (d->mii_bit >= 31) |
648 |
d->mii_state = MII_STATE_RESET; |
649 |
break; |
650 |
} |
651 |
|
652 |
d->reg[CSR_MIIROM / 8] &= ~MIIROM_MDI; |
653 |
if (ibit) |
654 |
d->reg[CSR_MIIROM / 8] |= MIIROM_MDI; |
655 |
} |
656 |
|
657 |
|
658 |
/* |
659 |
* srom_access(): |
660 |
* |
661 |
* This function handles reads from the Ethernet Address ROM. This is not a |
662 |
* 100% correct implementation, as it was reverse-engineered from OpenBSD |
663 |
* sources; it seems to work with OpenBSD, NetBSD, and Linux, though. |
664 |
* |
665 |
* Each transfer (if I understood this correctly) is of the following format: |
666 |
* |
667 |
* 1xx yyyyyy zzzzzzzzzzzzzzzz |
668 |
* |
669 |
* where 1xx = operation (6 means a Read), |
670 |
* yyyyyy = ROM address |
671 |
* zz...z = data |
672 |
* |
673 |
* y and z are _both_ read and written to at the same time; this enables the |
674 |
* operating system to sense the number of bits in y (when reading, all y bits |
675 |
* are 1 except the last one). |
676 |
*/ |
677 |
static void srom_access(struct cpu *cpu, struct dec21143_data *d, |
678 |
uint32_t oldreg, uint32_t idata) |
679 |
{ |
680 |
int obit, ibit; |
681 |
|
682 |
/* debug("CSR9 WRITE! 0x%08x\n", (int)idata); */ |
683 |
|
684 |
/* New selection? Then reset internal state. */ |
685 |
if (idata & MIIROM_SR && !(oldreg & MIIROM_SR)) { |
686 |
d->srom_curbit = 0; |
687 |
d->srom_opcode = 0; |
688 |
d->srom_opcode_has_started = 0; |
689 |
d->srom_addr = 0; |
690 |
} |
691 |
|
692 |
/* Only care about data during clock cycles: */ |
693 |
if (!(idata & MIIROM_SROMSK)) |
694 |
return; |
695 |
|
696 |
obit = 0; |
697 |
ibit = idata & MIIROM_SROMDI? 1 : 0; |
698 |
/* debug("CLOCK CYCLE! (bit %i): ", d->srom_curbit); */ |
699 |
|
700 |
/* |
701 |
* Linux sends more zeroes before starting the actual opcode, than |
702 |
* OpenBSD and NetBSD. Hopefully this is correct. (I'm just guessing |
703 |
* that all opcodes should start with a 1, perhaps that's not really |
704 |
* the case.) |
705 |
*/ |
706 |
if (!ibit && !d->srom_opcode_has_started) |
707 |
return; |
708 |
|
709 |
if (d->srom_curbit < 3) { |
710 |
d->srom_opcode_has_started = 1; |
711 |
d->srom_opcode <<= 1; |
712 |
d->srom_opcode |= ibit; |
713 |
/* debug("opcode input '%i'\n", ibit); */ |
714 |
} else { |
715 |
switch (d->srom_opcode) { |
716 |
case TULIP_SROM_OPC_READ: |
717 |
if (d->srom_curbit < ROM_WIDTH + 3) { |
718 |
obit = d->srom_curbit < ROM_WIDTH + 2; |
719 |
d->srom_addr <<= 1; |
720 |
d->srom_addr |= ibit; |
721 |
} else { |
722 |
uint16_t romword = d->srom[d->srom_addr*2] |
723 |
+ (d->srom[d->srom_addr*2+1] << 8); |
724 |
if (d->srom_curbit == ROM_WIDTH + 3) |
725 |
debug("[ dec21143: ROM read from offset" |
726 |
" 0x%03x: 0x%04x ]\n", |
727 |
d->srom_addr, romword); |
728 |
obit = romword & (0x8000 >> |
729 |
(d->srom_curbit - ROM_WIDTH - 3))? 1 : 0; |
730 |
} |
731 |
break; |
732 |
default:fatal("[ dec21243: unimplemented SROM/EEPROM " |
733 |
"opcode %i ]\n", d->srom_opcode); |
734 |
} |
735 |
d->reg[CSR_MIIROM / 8] &= ~MIIROM_SROMDO; |
736 |
if (obit) |
737 |
d->reg[CSR_MIIROM / 8] |= MIIROM_SROMDO; |
738 |
/* debug("input '%i', output '%i'\n", ibit, obit); */ |
739 |
} |
740 |
|
741 |
d->srom_curbit ++; |
742 |
|
743 |
/* |
744 |
* Done opcode + addr + data? Then restart. (At least NetBSD does |
745 |
* sequential reads without turning selection off and then on.) |
746 |
*/ |
747 |
if (d->srom_curbit >= 3 + ROM_WIDTH + 16) { |
748 |
d->srom_curbit = 0; |
749 |
d->srom_opcode = 0; |
750 |
d->srom_opcode_has_started = 0; |
751 |
d->srom_addr = 0; |
752 |
} |
753 |
} |
754 |
|
755 |
|
756 |
/* |
757 |
* dec21143_reset(): |
758 |
* |
759 |
* Set the 21143 registers, SROM, and MII data to reasonable values. |
760 |
*/ |
761 |
static void dec21143_reset(struct cpu *cpu, struct dec21143_data *d) |
762 |
{ |
763 |
int leaf; |
764 |
|
765 |
if (d->cur_rx_buf != NULL) |
766 |
free(d->cur_rx_buf); |
767 |
if (d->cur_tx_buf != NULL) |
768 |
free(d->cur_tx_buf); |
769 |
d->cur_rx_buf = d->cur_tx_buf = NULL; |
770 |
|
771 |
memset(d->reg, 0, sizeof(uint32_t) * N_REGS); |
772 |
memset(d->srom, 0, sizeof(d->srom)); |
773 |
memset(d->mii_phy_reg, 0, sizeof(d->mii_phy_reg)); |
774 |
|
775 |
/* Register values at reset, according to the manual: */ |
776 |
d->reg[CSR_BUSMODE / 8] = 0xfe000000; /* csr0 */ |
777 |
d->reg[CSR_MIIROM / 8] = 0xfff483ff; /* csr9 */ |
778 |
d->reg[CSR_SIACONN / 8] = 0xffff0000; /* csr13 */ |
779 |
d->reg[CSR_SIATXRX / 8] = 0xffffffff; /* csr14 */ |
780 |
d->reg[CSR_SIAGEN / 8] = 0x8ff00000; /* csr15 */ |
781 |
|
782 |
d->tx_idling_threshold = 10; |
783 |
d->cur_rx_addr = d->cur_tx_addr = 0; |
784 |
|
785 |
/* Version (= 1) and Chip count (= 1): */ |
786 |
d->srom[TULIP_ROM_SROM_FORMAT_VERION] = 1; |
787 |
d->srom[TULIP_ROM_CHIP_COUNT] = 1; |
788 |
|
789 |
/* Set the MAC address: */ |
790 |
memcpy(d->srom + TULIP_ROM_IEEE_NETWORK_ADDRESS, d->mac, 6); |
791 |
|
792 |
leaf = 30; |
793 |
d->srom[TULIP_ROM_CHIPn_DEVICE_NUMBER(0)] = 0; |
794 |
d->srom[TULIP_ROM_CHIPn_INFO_LEAF_OFFSET(0)] = leaf & 255; |
795 |
d->srom[TULIP_ROM_CHIPn_INFO_LEAF_OFFSET(0)+1] = leaf >> 8; |
796 |
|
797 |
d->srom[leaf+TULIP_ROM_IL_SELECT_CONN_TYPE] = 0; /* Not used? */ |
798 |
d->srom[leaf+TULIP_ROM_IL_MEDIA_COUNT] = 2; |
799 |
leaf += TULIP_ROM_IL_MEDIAn_BLOCK_BASE; |
800 |
|
801 |
d->srom[leaf] = 7; /* descriptor length */ |
802 |
d->srom[leaf+1] = TULIP_ROM_MB_21142_SIA; |
803 |
d->srom[leaf+2] = TULIP_ROM_MB_MEDIA_100TX; |
804 |
/* here comes 4 bytes of GPIO control/data settings */ |
805 |
leaf += d->srom[leaf]; |
806 |
|
807 |
d->srom[leaf] = 15; /* descriptor length */ |
808 |
d->srom[leaf+1] = TULIP_ROM_MB_21142_MII; |
809 |
d->srom[leaf+2] = 0; /* PHY nr */ |
810 |
d->srom[leaf+3] = 0; /* len of select sequence */ |
811 |
d->srom[leaf+4] = 0; /* len of reset sequence */ |
812 |
/* 5,6, 7,8, 9,10, 11,12, 13,14 = unused by GXemul */ |
813 |
leaf += d->srom[leaf]; |
814 |
|
815 |
/* MII PHY initial state: */ |
816 |
d->mii_state = MII_STATE_RESET; |
817 |
|
818 |
/* PHY #0: */ |
819 |
d->mii_phy_reg[MII_BMSR] = BMSR_100TXFDX | BMSR_10TFDX | |
820 |
BMSR_ACOMP | BMSR_ANEG | BMSR_LINK; |
821 |
} |
822 |
|
823 |
|
824 |
DEVICE_ACCESS(dec21143) |
825 |
{ |
826 |
struct dec21143_data *d = extra; |
827 |
uint64_t idata = 0, odata = 0; |
828 |
uint32_t oldreg = 0; |
829 |
int regnr = relative_addr >> 3; |
830 |
|
831 |
if (writeflag == MEM_WRITE) |
832 |
idata = memory_readmax64(cpu, data, len | d->pci_little_endian); |
833 |
|
834 |
if ((relative_addr & 7) == 0 && regnr < N_REGS) { |
835 |
if (writeflag == MEM_READ) { |
836 |
odata = d->reg[regnr]; |
837 |
} else { |
838 |
oldreg = d->reg[regnr]; |
839 |
switch (regnr) { |
840 |
case CSR_STATUS / 8: /* Zero-on-write */ |
841 |
d->reg[regnr] &= ~(idata & 0x0c01ffff); |
842 |
break; |
843 |
case CSR_MISSED / 8: /* Read only */ |
844 |
break; |
845 |
default:d->reg[regnr] = idata; |
846 |
} |
847 |
} |
848 |
} else |
849 |
fatal("[ dec21143: WARNING! unaligned access (0x%x) ]\n", |
850 |
(int)relative_addr); |
851 |
|
852 |
switch (relative_addr) { |
853 |
|
854 |
case CSR_BUSMODE: /* csr0 */ |
855 |
if (writeflag == MEM_WRITE) { |
856 |
/* Software reset takes effect immediately. */ |
857 |
if (idata & BUSMODE_SWR) { |
858 |
dec21143_reset(cpu, d); |
859 |
idata &= ~BUSMODE_SWR; |
860 |
} |
861 |
} |
862 |
break; |
863 |
|
864 |
case CSR_TXPOLL: /* csr1 */ |
865 |
if (writeflag == MEM_READ) |
866 |
fatal("[ dec21143: UNIMPLEMENTED READ from " |
867 |
"txpoll ]\n"); |
868 |
d->tx_idling = d->tx_idling_threshold; |
869 |
dev_dec21143_tick(cpu, extra); |
870 |
break; |
871 |
|
872 |
case CSR_RXPOLL: /* csr2 */ |
873 |
if (writeflag == MEM_READ) |
874 |
fatal("[ dec21143: UNIMPLEMENTED READ from " |
875 |
"rxpoll ]\n"); |
876 |
dev_dec21143_tick(cpu, extra); |
877 |
break; |
878 |
|
879 |
case CSR_RXLIST: /* csr3 */ |
880 |
if (writeflag == MEM_WRITE) { |
881 |
debug("[ dec21143: setting RXLIST to 0x%x ]\n", |
882 |
(int)idata); |
883 |
if (idata & 0x3) |
884 |
fatal("[ dec21143: WARNING! RXLIST not aligned" |
885 |
"? (0x%llx) ]\n", (long long)idata); |
886 |
idata &= ~0x3; |
887 |
d->cur_rx_addr = idata; |
888 |
} |
889 |
break; |
890 |
|
891 |
case CSR_TXLIST: /* csr4 */ |
892 |
if (writeflag == MEM_WRITE) { |
893 |
debug("[ dec21143: setting TXLIST to 0x%x ]\n", |
894 |
(int)idata); |
895 |
if (idata & 0x3) |
896 |
fatal("[ dec21143: WARNING! TXLIST not aligned" |
897 |
"? (0x%llx) ]\n", (long long)idata); |
898 |
idata &= ~0x3; |
899 |
d->cur_tx_addr = idata; |
900 |
} |
901 |
break; |
902 |
|
903 |
case CSR_STATUS: /* csr5 */ |
904 |
case CSR_INTEN: /* csr7 */ |
905 |
if (writeflag == MEM_WRITE) { |
906 |
/* Recalculate interrupt assertion. */ |
907 |
dev_dec21143_tick(cpu, extra); |
908 |
} |
909 |
break; |
910 |
|
911 |
case CSR_OPMODE: /* csr6: */ |
912 |
if (writeflag == MEM_WRITE) { |
913 |
if (idata & 0x02000000) { |
914 |
/* A must-be-one bit. */ |
915 |
idata &= ~0x02000000; |
916 |
} |
917 |
if (idata & OPMODE_ST) { |
918 |
idata &= ~OPMODE_ST; |
919 |
} else { |
920 |
/* Turned off TX? Then idle: */ |
921 |
d->reg[CSR_STATUS/8] |= STATUS_TPS; |
922 |
} |
923 |
if (idata & OPMODE_SR) { |
924 |
idata &= ~OPMODE_SR; |
925 |
} else { |
926 |
/* Turned off RX? Then go to stopped state: */ |
927 |
d->reg[CSR_STATUS/8] &= ~STATUS_RS; |
928 |
} |
929 |
idata &= ~(OPMODE_HBD | OPMODE_SCR | OPMODE_PCS |
930 |
| OPMODE_PS | OPMODE_SF | OPMODE_TTM | OPMODE_FD); |
931 |
if (idata & OPMODE_PNIC_IT) { |
932 |
idata &= ~OPMODE_PNIC_IT; |
933 |
d->tx_idling = d->tx_idling_threshold; |
934 |
} |
935 |
if (idata != 0) { |
936 |
fatal("[ dec21143: UNIMPLEMENTED OPMODE bits" |
937 |
": 0x%08x ]\n", (int)idata); |
938 |
} |
939 |
dev_dec21143_tick(cpu, extra); |
940 |
} |
941 |
break; |
942 |
|
943 |
case CSR_MISSED: /* csr8 */ |
944 |
break; |
945 |
|
946 |
case CSR_MIIROM: /* csr9 */ |
947 |
if (writeflag == MEM_WRITE) { |
948 |
if (idata & MIIROM_MDC) |
949 |
mii_access(cpu, d, oldreg, idata); |
950 |
else |
951 |
srom_access(cpu, d, oldreg, idata); |
952 |
} |
953 |
break; |
954 |
|
955 |
case CSR_SIASTAT: /* csr12 */ |
956 |
/* Auto-negotiation status = Good. */ |
957 |
odata = SIASTAT_ANS_FLPGOOD; |
958 |
break; |
959 |
|
960 |
case CSR_SIATXRX: /* csr14 */ |
961 |
/* Auto-negotiation Enabled */ |
962 |
odata = SIATXRX_ANE; |
963 |
break; |
964 |
|
965 |
case CSR_SIACONN: /* csr13 */ |
966 |
case CSR_SIAGEN: /* csr15 */ |
967 |
/* Don't print warnings for these, for now. */ |
968 |
break; |
969 |
|
970 |
default:if (writeflag == MEM_READ) |
971 |
fatal("[ dec21143: read from unimplemented 0x%02x ]\n", |
972 |
(int)relative_addr); |
973 |
else |
974 |
fatal("[ dec21143: write to unimplemented 0x%02x: " |
975 |
"0x%02x ]\n", (int)relative_addr, (int)idata); |
976 |
} |
977 |
|
978 |
if (writeflag == MEM_READ) |
979 |
memory_writemax64(cpu, data, len | d->pci_little_endian, odata); |
980 |
|
981 |
return 1; |
982 |
} |
983 |
|
984 |
|
985 |
DEVINIT(dec21143) |
986 |
{ |
987 |
struct dec21143_data *d; |
988 |
char name2[100]; |
989 |
|
990 |
d = malloc(sizeof(struct dec21143_data)); |
991 |
if (d == NULL) { |
992 |
fprintf(stderr, "out of memory\n"); |
993 |
exit(1); |
994 |
} |
995 |
memset(d, 0, sizeof(struct dec21143_data)); |
996 |
|
997 |
INTERRUPT_CONNECT(devinit->interrupt_path, d->irq); |
998 |
d->pci_little_endian = devinit->pci_little_endian; |
999 |
|
1000 |
net_generate_unique_mac(devinit->machine, d->mac); |
1001 |
net_add_nic(devinit->machine->emul->net, d, d->mac); |
1002 |
d->net = devinit->machine->emul->net; |
1003 |
|
1004 |
dec21143_reset(devinit->machine->cpus[0], d); |
1005 |
|
1006 |
snprintf(name2, sizeof(name2), "%s [%02x:%02x:%02x:%02x:%02x:%02x]", |
1007 |
devinit->name, d->mac[0], d->mac[1], d->mac[2], d->mac[3], |
1008 |
d->mac[4], d->mac[5]); |
1009 |
|
1010 |
memory_device_register(devinit->machine->memory, name2, |
1011 |
devinit->addr, 0x100, dev_dec21143_access, d, DM_DEFAULT, NULL); |
1012 |
|
1013 |
machine_add_tickfunction(devinit->machine, |
1014 |
dev_dec21143_tick, d, DEC21143_TICK_SHIFT, 0.0); |
1015 |
|
1016 |
/* |
1017 |
* NetBSD/cats uses memory accesses, OpenBSD/cats uses I/O registers. |
1018 |
* Let's make a mirror from the memory range to the I/O range: |
1019 |
*/ |
1020 |
dev_ram_init(devinit->machine, devinit->addr2, 0x100, DEV_RAM_MIRROR |
1021 |
| DEV_RAM_MIGHT_POINT_TO_DEVICES, devinit->addr); |
1022 |
|
1023 |
return 1; |
1024 |
} |
1025 |
|