diff options
Diffstat (limited to 'u-boot/drivers/net/cs8900.c')
| -rw-r--r-- | u-boot/drivers/net/cs8900.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/u-boot/drivers/net/cs8900.c b/u-boot/drivers/net/cs8900.c new file mode 100644 index 0000000..9424fb2 --- /dev/null +++ b/u-boot/drivers/net/cs8900.c @@ -0,0 +1,337 @@ +/* + * Cirrus Logic CS8900A Ethernet + * + * (C) 2009 Ben Warren , biggerbadderben@gmail.com + * Converted to use CONFIG_NET_MULTI API + * + * (C) 2003 Wolfgang Denk, wd@denx.de + * Extension to synchronize ethaddr environment variable + * against value in EEPROM + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Marius Groeger <mgroeger@sysgo.de> + * + * Copyright (C) 1999 Ben Williamson <benw@pobox.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is loaded into SRAM in bootstrap mode, where it waits + * for commands on UART1 to read and write memory, jump to code etc. + * A design goal for this program is to be entirely independent of the + * target board. Anything with a CL-PS7111 or EP7211 should be able to run + * this code in bootstrap mode. All the board specifics can be handled on + * the host. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <common.h> +#include <command.h> +#include <asm/io.h> +#include <net.h> +#include <malloc.h> +#include "cs8900.h" + +#undef DEBUG + +/* packet page register access functions */ + +#ifdef CONFIG_CS8900_BUS32 + +#define REG_WRITE(v, a) writel((v),(a)) +#define REG_READ(a) readl((a)) + +/* we don't need 16 bit initialisation on 32 bit bus */ +#define get_reg_init_bus(r,d) get_reg((r),(d)) + +#else + +#define REG_WRITE(v, a) writew((v),(a)) +#define REG_READ(a) readw((a)) + +static u16 get_reg_init_bus(struct eth_device *dev, int regno) +{ + /* force 16 bit busmode */ + volatile u8 c; + struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); + uint8_t volatile * const iob = (uint8_t volatile * const)dev->iobase; + + c = readb(iob); + c = readb(iob + 1); + c = readb(iob); + c = readb(iob + 1); + c = readb(iob); + + REG_WRITE(regno, &priv->regs->pptr); + return REG_READ(&priv->regs->pdata); +} +#endif + +static u16 get_reg(struct eth_device *dev, int regno) +{ + struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); + REG_WRITE(regno, &priv->regs->pptr); + return REG_READ(&priv->regs->pdata); +} + + +static void put_reg(struct eth_device *dev, int regno, u16 val) +{ + struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); + REG_WRITE(regno, &priv->regs->pptr); + REG_WRITE(val, &priv->regs->pdata); +} + +static void cs8900_reset(struct eth_device *dev) +{ + int tmo; + u16 us; + + /* reset NIC */ + put_reg(dev, PP_SelfCTL, get_reg(dev, PP_SelfCTL) | PP_SelfCTL_Reset); + + /* wait for 200ms */ + udelay(200000); + /* Wait until the chip is reset */ + + tmo = get_timer(0) + 1 * CONFIG_SYS_HZ; + while ((((us = get_reg_init_bus(dev, PP_SelfSTAT)) & + PP_SelfSTAT_InitD) == 0) && tmo < get_timer(0)) + /*NOP*/; +} + +static void cs8900_reginit(struct eth_device *dev) +{ + /* receive only error free packets addressed to this card */ + put_reg(dev, PP_RxCTL, + PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK); + /* do not generate any interrupts on receive operations */ + put_reg(dev, PP_RxCFG, 0); + /* do not generate any interrupts on transmit operations */ + put_reg(dev, PP_TxCFG, 0); + /* do not generate any interrupts on buffer operations */ + put_reg(dev, PP_BufCFG, 0); + /* enable transmitter/receiver mode */ + put_reg(dev, PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx); +} + +void cs8900_get_enetaddr(struct eth_device *dev) +{ + int i; + + /* verify chip id */ + if (get_reg_init_bus(dev, PP_ChipID) != 0x630e) + return; + cs8900_reset(dev); + if ((get_reg(dev, PP_SelfSTAT) & + (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) == + (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) { + + /* Load the MAC from EEPROM */ + for (i = 0; i < 3; i++) { + u32 Addr; + + Addr = get_reg(dev, PP_IA + i * 2); + dev->enetaddr[i * 2] = Addr & 0xFF; + dev->enetaddr[i * 2 + 1] = Addr >> 8; + } + } +} + +void cs8900_halt(struct eth_device *dev) +{ + /* disable transmitter/receiver mode */ + put_reg(dev, PP_LineCTL, 0); + + /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */ + get_reg_init_bus(dev, PP_ChipID); +} + +static int cs8900_init(struct eth_device *dev, bd_t * bd) +{ + uchar *enetaddr = dev->enetaddr; + u16 id; + + /* verify chip id */ + id = get_reg_init_bus(dev, PP_ChipID); + if (id != 0x630e) { + printf ("CS8900 Ethernet chip not found: " + "ID=0x%04x instead 0x%04x\n", id, 0x630e); + return 1; + } + + cs8900_reset (dev); + /* set the ethernet address */ + put_reg(dev, PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8)); + put_reg(dev, PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8)); + put_reg(dev, PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8)); + + cs8900_reginit(dev); + return 0; +} + +/* Get a data block via Ethernet */ +static int cs8900_recv(struct eth_device *dev) +{ + int i; + u16 rxlen; + u16 *addr; + u16 status; + + struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); + + status = get_reg(dev, PP_RER); + + if ((status & PP_RER_RxOK) == 0) + return 0; + + status = REG_READ(&priv->regs->rtdata); + rxlen = REG_READ(&priv->regs->rtdata); + + if (rxlen > PKTSIZE_ALIGN + PKTALIGN) + debug("packet too big!\n"); + for (addr = (u16 *) NetRxPackets[0], i = rxlen >> 1; i > 0; + i--) + *addr++ = REG_READ(&priv->regs->rtdata); + if (rxlen & 1) + *addr++ = REG_READ(&priv->regs->rtdata); + + /* Pass the packet up to the protocol layers. */ + NetReceive (NetRxPackets[0], rxlen); + return rxlen; +} + +/* Send a data block via Ethernet. */ +static int cs8900_send(struct eth_device *dev, + volatile void *packet, int length) +{ + volatile u16 *addr; + int tmo; + u16 s; + struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); + +retry: + /* initiate a transmit sequence */ + REG_WRITE(PP_TxCmd_TxStart_Full, &priv->regs->txcmd); + REG_WRITE(length, &priv->regs->txlen); + + /* Test to see if the chip has allocated memory for the packet */ + if ((get_reg(dev, PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) { + /* Oops... this should not happen! */ + debug("cs: unable to send packet; retrying...\n"); + for (tmo = get_timer(0) + 5 * CONFIG_SYS_HZ; + get_timer(0) < tmo;) + /*NOP*/; + cs8900_reset(dev); + cs8900_reginit(dev); + goto retry; + } + + /* Write the contents of the packet */ + /* assume even number of bytes */ + for (addr = packet; length > 0; length -= 2) + REG_WRITE(*addr++, &priv->regs->rtdata); + + /* wait for transfer to succeed */ + tmo = get_timer(0) + 5 * CONFIG_SYS_HZ; + while ((s = get_reg(dev, PP_TER) & ~0x1F) == 0) { + if (get_timer(0) >= tmo) + break; + } + + /* nothing */ ; + if((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) { + debug("\ntransmission error %#x\n", s); + } + + return 0; +} + +static void cs8900_e2prom_ready(struct eth_device *dev) +{ + while (get_reg(dev, PP_SelfSTAT) & SI_BUSY) + ; +} + +/***********************************************************/ +/* read a 16-bit word out of the EEPROM */ +/***********************************************************/ + +int cs8900_e2prom_read(struct eth_device *dev, + u8 addr, u16 *value) +{ + cs8900_e2prom_ready(dev); + put_reg(dev, PP_EECMD, EEPROM_READ_CMD | addr); + cs8900_e2prom_ready(dev); + *value = get_reg(dev, PP_EEData); + + return 0; +} + + +/***********************************************************/ +/* write a 16-bit word into the EEPROM */ +/***********************************************************/ + +int cs8900_e2prom_write(struct eth_device *dev, u8 addr, u16 value) +{ + cs8900_e2prom_ready(dev); + put_reg(dev, PP_EECMD, EEPROM_WRITE_EN); + cs8900_e2prom_ready(dev); + put_reg(dev, PP_EEData, value); + put_reg(dev, PP_EECMD, EEPROM_WRITE_CMD | addr); + cs8900_e2prom_ready(dev); + put_reg(dev, PP_EECMD, EEPROM_WRITE_DIS); + cs8900_e2prom_ready(dev); + + return 0; +} + +int cs8900_initialize(u8 dev_num, int base_addr) +{ + struct eth_device *dev; + struct cs8900_priv *priv; + + dev = malloc(sizeof(*dev)); + if (!dev) { + return 0; + } + memset(dev, 0, sizeof(*dev)); + + priv = malloc(sizeof(*priv)); + if (!priv) { + free(dev); + return 0; + } + memset(priv, 0, sizeof(*priv)); + priv->regs = (struct cs8900_regs *)base_addr; + + dev->iobase = base_addr; + dev->priv = priv; + dev->init = cs8900_init; + dev->halt = cs8900_halt; + dev->send = cs8900_send; + dev->recv = cs8900_recv; + + /* Load MAC address from EEPROM */ + cs8900_get_enetaddr(dev); + + sprintf(dev->name, "%s-%hu", CS8900_DRIVERNAME, dev_num); + + eth_register(dev); + return 0; +} |