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![Mike Frysinger](/assets/img/avatar_default.png)
The environment is the canonical storage location of the mac address, so we're killing off the global data location and moving everything to querying the env directly. The cs8900 driver also changes slightly in that the hardware is not consulted if the mac address in the env is sane. Signed-off-by: Mike Frysinger <vapier@gentoo.org> CC: Marius Groeger <mgroeger@sysgo.de> CC: Ben Warren <biggerbadderben@gmail.com>
290 lines
7.0 KiB
C
290 lines
7.0 KiB
C
/*
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* Cirrus Logic CS8900A Ethernet
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*
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* (C) 2003 Wolfgang Denk, wd@denx.de
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* Extension to synchronize ethaddr environment variable
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* against value in EEPROM
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* Copyright (C) 1999 Ben Williamson <benw@pobox.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is loaded into SRAM in bootstrap mode, where it waits
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* for commands on UART1 to read and write memory, jump to code etc.
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* A design goal for this program is to be entirely independent of the
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* target board. Anything with a CL-PS7111 or EP7211 should be able to run
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* this code in bootstrap mode. All the board specifics can be handled on
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* the host.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <common.h>
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#include <command.h>
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#include "cs8900.h"
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#include <net.h>
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#undef DEBUG
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/* packet page register access functions */
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#ifdef CS8900_BUS32
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/* we don't need 16 bit initialisation on 32 bit bus */
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#define get_reg_init_bus(x) get_reg((x))
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#else
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static unsigned short get_reg_init_bus (int regno)
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{
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/* force 16 bit busmode */
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volatile unsigned char c;
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c = CS8900_BUS16_0;
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c = CS8900_BUS16_1;
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c = CS8900_BUS16_0;
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c = CS8900_BUS16_1;
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c = CS8900_BUS16_0;
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CS8900_PPTR = regno;
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return CS8900_PDATA;
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}
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#endif
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static unsigned short get_reg (int regno)
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{
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CS8900_PPTR = regno;
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return CS8900_PDATA;
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}
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static void put_reg (int regno, unsigned short val)
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{
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CS8900_PPTR = regno;
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CS8900_PDATA = val;
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}
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static void eth_reset (void)
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{
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int tmo;
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unsigned short us;
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/* reset NIC */
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put_reg (PP_SelfCTL, get_reg (PP_SelfCTL) | PP_SelfCTL_Reset);
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/* wait for 200ms */
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udelay (200000);
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/* Wait until the chip is reset */
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tmo = get_timer (0) + 1 * CONFIG_SYS_HZ;
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while ((((us = get_reg_init_bus (PP_SelfSTAT)) & PP_SelfSTAT_InitD) == 0)
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&& tmo < get_timer (0))
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/*NOP*/;
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}
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static void eth_reginit (void)
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{
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/* receive only error free packets addressed to this card */
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put_reg (PP_RxCTL, PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
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/* do not generate any interrupts on receive operations */
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put_reg (PP_RxCFG, 0);
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/* do not generate any interrupts on transmit operations */
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put_reg (PP_TxCFG, 0);
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/* do not generate any interrupts on buffer operations */
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put_reg (PP_BufCFG, 0);
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/* enable transmitter/receiver mode */
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put_reg (PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
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}
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void cs8900_get_enetaddr (void)
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{
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int i;
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uchar enetaddr[6];
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/* if the env is setup, then bail */
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if (eth_getenv_enetaddr("ethaddr", enetaddr))
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return;
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/* verify chip id */
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if (get_reg_init_bus (PP_ChipID) != 0x630e)
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return;
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eth_reset ();
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if ((get_reg (PP_SelfSTAT) & (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
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(PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) {
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/* Load the MAC from EEPROM */
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for (i = 0; i < 6 / 2; i++) {
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unsigned int Addr;
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Addr = get_reg (PP_IA + i * 2);
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enetaddr[i * 2] = Addr & 0xFF;
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enetaddr[i * 2 + 1] = Addr >> 8;
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}
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eth_setenv_enetaddr("ethaddr", enetaddr);
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debug("### Set environment from HW MAC addr = \"%pM\"\n", enetaddr);
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}
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}
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void eth_halt (void)
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{
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/* disable transmitter/receiver mode */
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put_reg (PP_LineCTL, 0);
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/* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
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get_reg_init_bus (PP_ChipID);
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}
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int eth_init (bd_t * bd)
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{
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uchar *enetaddr[6];
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/* verify chip id */
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if (get_reg_init_bus (PP_ChipID) != 0x630e) {
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printf ("CS8900 Ethernet chip not found?!\n");
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return 0;
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}
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eth_reset ();
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/* set the ethernet address */
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eth_getenv_enetaddr("ethaddr", enetaddr);
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put_reg (PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8));
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put_reg (PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8));
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put_reg (PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8));
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eth_reginit ();
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return 0;
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}
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/* Get a data block via Ethernet */
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int eth_rx (void)
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{
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int i;
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unsigned short rxlen;
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unsigned short *addr;
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unsigned short status;
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status = get_reg (PP_RER);
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if ((status & PP_RER_RxOK) == 0)
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return 0;
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status = CS8900_RTDATA; /* stat */
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rxlen = CS8900_RTDATA; /* len */
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#ifdef DEBUG
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if (rxlen > PKTSIZE_ALIGN + PKTALIGN)
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printf ("packet too big!\n");
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#endif
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for (addr = (unsigned short *) NetRxPackets[0], i = rxlen >> 1; i > 0;
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i--)
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*addr++ = CS8900_RTDATA;
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if (rxlen & 1)
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*addr++ = CS8900_RTDATA;
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/* Pass the packet up to the protocol layers. */
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NetReceive (NetRxPackets[0], rxlen);
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return rxlen;
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}
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/* Send a data block via Ethernet. */
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int eth_send (volatile void *packet, int length)
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{
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volatile unsigned short *addr;
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int tmo;
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unsigned short s;
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retry:
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/* initiate a transmit sequence */
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CS8900_TxCMD = PP_TxCmd_TxStart_Full;
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CS8900_TxLEN = length;
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/* Test to see if the chip has allocated memory for the packet */
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if ((get_reg (PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
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/* Oops... this should not happen! */
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#ifdef DEBUG
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printf ("cs: unable to send packet; retrying...\n");
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#endif
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for (tmo = get_timer (0) + 5 * CONFIG_SYS_HZ; get_timer (0) < tmo;)
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/*NOP*/;
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eth_reset ();
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eth_reginit ();
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goto retry;
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}
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/* Write the contents of the packet */
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/* assume even number of bytes */
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for (addr = packet; length > 0; length -= 2)
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CS8900_RTDATA = *addr++;
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/* wait for transfer to succeed */
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tmo = get_timer (0) + 5 * CONFIG_SYS_HZ;
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while ((s = get_reg (PP_TER) & ~0x1F) == 0) {
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if (get_timer (0) >= tmo)
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break;
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}
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/* nothing */ ;
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if ((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
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#ifdef DEBUG
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printf ("\ntransmission error %#x\n", s);
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#endif
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}
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return 0;
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}
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static void cs8900_e2prom_ready(void)
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{
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while (get_reg(PP_SelfSTAT) & SI_BUSY)
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;
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}
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/***********************************************************/
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/* read a 16-bit word out of the EEPROM */
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/***********************************************************/
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int cs8900_e2prom_read(unsigned char addr, unsigned short *value)
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{
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cs8900_e2prom_ready();
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put_reg(PP_EECMD, EEPROM_READ_CMD | addr);
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cs8900_e2prom_ready();
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*value = get_reg(PP_EEData);
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return 0;
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}
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/***********************************************************/
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/* write a 16-bit word into the EEPROM */
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/***********************************************************/
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int cs8900_e2prom_write(unsigned char addr, unsigned short value)
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{
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cs8900_e2prom_ready();
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put_reg(PP_EECMD, EEPROM_WRITE_EN);
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cs8900_e2prom_ready();
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put_reg(PP_EEData, value);
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put_reg(PP_EECMD, EEPROM_WRITE_CMD | addr);
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cs8900_e2prom_ready();
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put_reg(PP_EECMD, EEPROM_WRITE_DIS);
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cs8900_e2prom_ready();
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return 0;
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}
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