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Diffstat (limited to 'drivers/rtl8139.c')
| -rw-r--r-- | drivers/rtl8139.c | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/drivers/rtl8139.c b/drivers/rtl8139.c new file mode 100644 index 0000000..5b14e71 --- /dev/null +++ b/drivers/rtl8139.c @@ -0,0 +1,539 @@ +/* + * rtl8139.c : U-Boot driver for the RealTek RTL8139 + * + * Masami Komiya (mkomiya@sonare.it) + * + * Most part is taken from rtl8139.c of etherboot + * + */ + +/* rtl8139.c - etherboot driver for the Realtek 8139 chipset + + ported from the linux driver written by Donald Becker + by Rainer Bawidamann (Rainer.Bawidamann@informatik.uni-ulm.de) 1999 + + This software may be used and distributed according to the terms + of the GNU Public License, incorporated herein by reference. + + changes to the original driver: + - removed support for interrupts, switching to polling mode (yuck!) + - removed support for the 8129 chip (external MII) + +*/ + +/*********************************************************************/ +/* Revision History */ +/*********************************************************************/ + +/* + 28 Dec 2002 ken_yap@users.sourceforge.net (Ken Yap) + Put in virt_to_bus calls to allow Etherboot relocation. + + 06 Apr 2001 ken_yap@users.sourceforge.net (Ken Yap) + Following email from Hyun-Joon Cha, added a disable routine, otherwise + NIC remains live and can crash the kernel later. + + 4 Feb 2000 espenlaub@informatik.uni-ulm.de (Klaus Espenlaub) + Shuffled things around, removed the leftovers from the 8129 support + that was in the Linux driver and added a bit more 8139 definitions. + Moved the 8K receive buffer to a fixed, available address outside the + 0x98000-0x9ffff range. This is a bit of a hack, but currently the only + way to make room for the Etherboot features that need substantial amounts + of code like the ANSI console support. Currently the buffer is just below + 0x10000, so this even conforms to the tagged boot image specification, + which reserves the ranges 0x00000-0x10000 and 0x98000-0xA0000. My + interpretation of this "reserved" is that Etherboot may do whatever it + likes, as long as its environment is kept intact (like the BIOS + variables). Hopefully fixed rtl_poll() once and for all. The symptoms + were that if Etherboot was left at the boot menu for several minutes, the + first eth_poll failed. Seems like I am the only person who does this. + First of all I fixed the debugging code and then set out for a long bug + hunting session. It took me about a week full time work - poking around + various places in the driver, reading Don Becker's and Jeff Garzik's Linux + driver and even the FreeBSD driver (what a piece of crap!) - and + eventually spotted the nasty thing: the transmit routine was acknowledging + each and every interrupt pending, including the RxOverrun and RxFIFIOver + interrupts. This confused the RTL8139 thoroughly. It destroyed the + Rx ring contents by dumping the 2K FIFO contents right where we wanted to + get the next packet. Oh well, what fun. + + 18 Jan 2000 mdc@thinguin.org (Marty Connor) + Drastically simplified error handling. Basically, if any error + in transmission or reception occurs, the card is reset. + Also, pointed all transmit descriptors to the same buffer to + save buffer space. This should decrease driver size and avoid + corruption because of exceeding 32K during runtime. + + 28 Jul 1999 (Matthias Meixner - meixner@rbg.informatik.tu-darmstadt.de) + rtl_poll was quite broken: it used the RxOK interrupt flag instead + of the RxBufferEmpty flag which often resulted in very bad + transmission performace - below 1kBytes/s. + +*/ + +#include <common.h> +#include <malloc.h> +#include <net.h> +#include <asm/io.h> +#include <pci.h> + +#ifdef __MIPS__ +static unsigned long mips_io_port_base = 0; +#endif + +#if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI) && \ + defined(CONFIG_RTL8139) + +#define TICKS_PER_SEC CFG_HZ +#define TICKS_PER_MS (TICKS_PER_SEC/1000) + +#define RTL_TIMEOUT (1*TICKS_PER_SEC) + +#define ETH_FRAME_LEN 1514 +#define ETH_ALEN 6 +#define ETH_ZLEN 60 + +/* PCI Tuning Parameters + Threshold is bytes transferred to chip before transmission starts. */ +#define TX_FIFO_THRESH 256 /* In bytes, rounded down to 32 byte units. */ +#define RX_FIFO_THRESH 4 /* Rx buffer level before first PCI xfer. */ +#define RX_DMA_BURST 4 /* Maximum PCI burst, '4' is 256 bytes */ +#define TX_DMA_BURST 4 /* Calculate as 16<<val. */ +#define NUM_TX_DESC 4 /* Number of Tx descriptor registers. */ +#define TX_BUF_SIZE ETH_FRAME_LEN /* FCS is added by the chip */ +#define RX_BUF_LEN_IDX 0 /* 0, 1, 2 is allowed - 8,16,32K rx buffer */ +#define RX_BUF_LEN (8192 << RX_BUF_LEN_IDX) + +#undef DEBUG_TX +#undef DEBUG_RX + +#define currticks() get_timer(0) +#define bus_to_phys(a) pci_mem_to_phys((pci_dev_t)dev->priv, a) +#define phys_to_bus(a) pci_phys_to_mem((pci_dev_t)dev->priv, a) + +/* Symbolic offsets to registers. */ +enum RTL8139_registers { + MAC0=0, /* Ethernet hardware address. */ + MAR0=8, /* Multicast filter. */ + TxStatus0=0x10, /* Transmit status (four 32bit registers). */ + TxAddr0=0x20, /* Tx descriptors (also four 32bit). */ + RxBuf=0x30, RxEarlyCnt=0x34, RxEarlyStatus=0x36, + ChipCmd=0x37, RxBufPtr=0x38, RxBufAddr=0x3A, + IntrMask=0x3C, IntrStatus=0x3E, + TxConfig=0x40, RxConfig=0x44, + Timer=0x48, /* general-purpose counter. */ + RxMissed=0x4C, /* 24 bits valid, write clears. */ + Cfg9346=0x50, Config0=0x51, Config1=0x52, + TimerIntrReg=0x54, /* intr if gp counter reaches this value */ + MediaStatus=0x58, + Config3=0x59, + MultiIntr=0x5C, + RevisionID=0x5E, /* revision of the RTL8139 chip */ + TxSummary=0x60, + MII_BMCR=0x62, MII_BMSR=0x64, NWayAdvert=0x66, NWayLPAR=0x68, + NWayExpansion=0x6A, + DisconnectCnt=0x6C, FalseCarrierCnt=0x6E, + NWayTestReg=0x70, + RxCnt=0x72, /* packet received counter */ + CSCR=0x74, /* chip status and configuration register */ + PhyParm1=0x78,TwisterParm=0x7c,PhyParm2=0x80, /* undocumented */ + /* from 0x84 onwards are a number of power management/wakeup frame + * definitions we will probably never need to know about. */ +}; + +enum ChipCmdBits { + CmdReset=0x10, CmdRxEnb=0x08, CmdTxEnb=0x04, RxBufEmpty=0x01, }; + +/* Interrupt register bits, using my own meaningful names. */ +enum IntrStatusBits { + PCIErr=0x8000, PCSTimeout=0x4000, CableLenChange= 0x2000, + RxFIFOOver=0x40, RxUnderrun=0x20, RxOverflow=0x10, + TxErr=0x08, TxOK=0x04, RxErr=0x02, RxOK=0x01, +}; +enum TxStatusBits { + TxHostOwns=0x2000, TxUnderrun=0x4000, TxStatOK=0x8000, + TxOutOfWindow=0x20000000, TxAborted=0x40000000, + TxCarrierLost=0x80000000, +}; +enum RxStatusBits { + RxMulticast=0x8000, RxPhysical=0x4000, RxBroadcast=0x2000, + RxBadSymbol=0x0020, RxRunt=0x0010, RxTooLong=0x0008, RxCRCErr=0x0004, + RxBadAlign=0x0002, RxStatusOK=0x0001, +}; + +enum MediaStatusBits { + MSRTxFlowEnable=0x80, MSRRxFlowEnable=0x40, MSRSpeed10=0x08, + MSRLinkFail=0x04, MSRRxPauseFlag=0x02, MSRTxPauseFlag=0x01, +}; + +enum MIIBMCRBits { + BMCRReset=0x8000, BMCRSpeed100=0x2000, BMCRNWayEnable=0x1000, + BMCRRestartNWay=0x0200, BMCRDuplex=0x0100, +}; + +enum CSCRBits { + CSCR_LinkOKBit=0x0400, CSCR_LinkChangeBit=0x0800, + CSCR_LinkStatusBits=0x0f000, CSCR_LinkDownOffCmd=0x003c0, + CSCR_LinkDownCmd=0x0f3c0, +}; + +/* Bits in RxConfig. */ +enum rx_mode_bits { + RxCfgWrap=0x80, + AcceptErr=0x20, AcceptRunt=0x10, AcceptBroadcast=0x08, + AcceptMulticast=0x04, AcceptMyPhys=0x02, AcceptAllPhys=0x01, +}; + +static int ioaddr; +static unsigned int cur_rx,cur_tx; + +/* The RTL8139 can only transmit from a contiguous, aligned memory block. */ +static unsigned char tx_buffer[TX_BUF_SIZE] __attribute__((aligned(4))); +static unsigned char rx_ring[RX_BUF_LEN+16] __attribute__((aligned(4))); + +static int rtl8139_probe(struct eth_device *dev, bd_t *bis); +static int read_eeprom(int location, int addr_len); +static void rtl_reset(struct eth_device *dev); +static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length); +static int rtl_poll(struct eth_device *dev); +static void rtl_disable(struct eth_device *dev); + +static struct pci_device_id supported[] = { + {PCI_VENDOR_ID_REALTEK, PCI_DEVICE_ID_REALTEK_8139}, + {} +}; + +int rtl8139_initialize(bd_t *bis) +{ + pci_dev_t devno; + int card_number = 0; + struct eth_device *dev; + u32 iobase; + int idx=0; + + while(1){ + /* Find RTL8139 */ + if ((devno = pci_find_devices(supported, idx++)) < 0) + break; + + pci_read_config_dword(devno, PCI_BASE_ADDRESS_1, &iobase); + iobase &= ~0xf; + + debug ("rtl8139: REALTEK RTL8139 @0x%x\n", iobase); + + dev = (struct eth_device *)malloc(sizeof *dev); + + sprintf (dev->name, "RTL8139#%d", card_number); + + dev->priv = (void *) devno; + dev->iobase = (int)bus_to_phys(iobase); + dev->init = rtl8139_probe; + dev->halt = rtl_disable; + dev->send = rtl_transmit; + dev->recv = rtl_poll; + + eth_register (dev); + + card_number++; + + pci_write_config_byte (devno, PCI_LATENCY_TIMER, 0x20); + + udelay (10 * 1000); + } + + return card_number; +} + +static int rtl8139_probe(struct eth_device *dev, bd_t *bis) +{ + int i; + int speed10, fullduplex; + int addr_len; + unsigned short *ap = (unsigned short *)dev->enetaddr; + + ioaddr = dev->iobase; + + /* Bring the chip out of low-power mode. */ + outb(0x00, ioaddr + Config1); + + addr_len = read_eeprom(0,8) == 0x8129 ? 8 : 6; + for (i = 0; i < 3; i++) + *ap++ = read_eeprom(i + 7, addr_len); + + speed10 = inb(ioaddr + MediaStatus) & MSRSpeed10; + fullduplex = inw(ioaddr + MII_BMCR) & BMCRDuplex; + + rtl_reset(dev); + + if (inb(ioaddr + MediaStatus) & MSRLinkFail) { + printf("Cable not connected or other link failure\n"); + return(0); + } + + return 1; +} + +/* Serial EEPROM section. */ + +/* EEPROM_Ctrl bits. */ +#define EE_SHIFT_CLK 0x04 /* EEPROM shift clock. */ +#define EE_CS 0x08 /* EEPROM chip select. */ +#define EE_DATA_WRITE 0x02 /* EEPROM chip data in. */ +#define EE_WRITE_0 0x00 +#define EE_WRITE_1 0x02 +#define EE_DATA_READ 0x01 /* EEPROM chip data out. */ +#define EE_ENB (0x80 | EE_CS) + +/* + Delay between EEPROM clock transitions. + No extra delay is needed with 33Mhz PCI, but 66Mhz may change this. +*/ + +#define eeprom_delay() inl(ee_addr) + +/* The EEPROM commands include the alway-set leading bit. */ +#define EE_WRITE_CMD (5) +#define EE_READ_CMD (6) +#define EE_ERASE_CMD (7) + +static int read_eeprom(int location, int addr_len) +{ + int i; + unsigned int retval = 0; + long ee_addr = ioaddr + Cfg9346; + int read_cmd = location | (EE_READ_CMD << addr_len); + + outb(EE_ENB & ~EE_CS, ee_addr); + outb(EE_ENB, ee_addr); + eeprom_delay(); + + /* Shift the read command bits out. */ + for (i = 4 + addr_len; i >= 0; i--) { + int dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0; + outb(EE_ENB | dataval, ee_addr); + eeprom_delay(); + outb(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr); + eeprom_delay(); + } + outb(EE_ENB, ee_addr); + eeprom_delay(); + + for (i = 16; i > 0; i--) { + outb(EE_ENB | EE_SHIFT_CLK, ee_addr); + eeprom_delay(); + retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0); + outb(EE_ENB, ee_addr); + eeprom_delay(); + } + + /* Terminate the EEPROM access. */ + outb(~EE_CS, ee_addr); + eeprom_delay(); + return retval; +} + +static const unsigned int rtl8139_rx_config = + (RX_BUF_LEN_IDX << 11) | + (RX_FIFO_THRESH << 13) | + (RX_DMA_BURST << 8); + +static void set_rx_mode(struct eth_device *dev) { + unsigned int mc_filter[2]; + int rx_mode; + /* !IFF_PROMISC */ + rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys; + mc_filter[1] = mc_filter[0] = 0xffffffff; + + outl(rtl8139_rx_config | rx_mode, ioaddr + RxConfig); + + outl(mc_filter[0], ioaddr + MAR0 + 0); + outl(mc_filter[1], ioaddr + MAR0 + 4); +} + +static void rtl_reset(struct eth_device *dev) +{ + int i; + + outb(CmdReset, ioaddr + ChipCmd); + + cur_rx = 0; + cur_tx = 0; + + /* Give the chip 10ms to finish the reset. */ + for (i=0; i<100; ++i){ + if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break; + udelay (100); /* wait 100us */ + } + + + for (i = 0; i < ETH_ALEN; i++) + outb(dev->enetaddr[i], ioaddr + MAC0 + i); + + /* Must enable Tx/Rx before setting transfer thresholds! */ + outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd); + outl((RX_FIFO_THRESH<<13) | (RX_BUF_LEN_IDX<<11) | (RX_DMA_BURST<<8), + ioaddr + RxConfig); /* accept no frames yet! */ + outl((TX_DMA_BURST<<8)|0x03000000, ioaddr + TxConfig); + + /* The Linux driver changes Config1 here to use a different LED pattern + * for half duplex or full/autodetect duplex (for full/autodetect, the + * outputs are TX/RX, Link10/100, FULL, while for half duplex it uses + * TX/RX, Link100, Link10). This is messy, because it doesn't match + * the inscription on the mounting bracket. It should not be changed + * from the configuration EEPROM default, because the card manufacturer + * should have set that to match the card. */ + +#ifdef DEBUG_RX + printf("rx ring address is %X\n",(unsigned long)rx_ring); +#endif + outl(phys_to_bus((int)rx_ring), ioaddr + RxBuf); + + /* If we add multicast support, the MAR0 register would have to be + * initialized to 0xffffffffffffffff (two 32 bit accesses). Etherboot + * only needs broadcast (for ARP/RARP/BOOTP/DHCP) and unicast. */ + + outb(CmdRxEnb | CmdTxEnb, ioaddr + ChipCmd); + + outl(rtl8139_rx_config, ioaddr + RxConfig); + + /* Start the chip's Tx and Rx process. */ + outl(0, ioaddr + RxMissed); + + /* set_rx_mode */ + set_rx_mode(dev); + + /* Disable all known interrupts by setting the interrupt mask. */ + outw(0, ioaddr + IntrMask); +} + +static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length) +{ + unsigned int status, to; + unsigned long txstatus; + unsigned int len = length; + + ioaddr = dev->iobase; + + memcpy((char *)tx_buffer, (char *)packet, (int)length); + +#ifdef DEBUG_TX + printf("sending %d bytes\n", len); +#endif + + /* Note: RTL8139 doesn't auto-pad, send minimum payload (another 4 + * bytes are sent automatically for the FCS, totalling to 64 bytes). */ + while (len < ETH_ZLEN) { + tx_buffer[len++] = '\0'; + } + + outl(phys_to_bus((int)tx_buffer), ioaddr + TxAddr0 + cur_tx*4); + outl(((TX_FIFO_THRESH<<11) & 0x003f0000) | len, + ioaddr + TxStatus0 + cur_tx*4); + + to = currticks() + RTL_TIMEOUT; + + do { + status = inw(ioaddr + IntrStatus); + /* Only acknlowledge interrupt sources we can properly handle + * here - the RxOverflow/RxFIFOOver MUST be handled in the + * rtl_poll() function. */ + outw(status & (TxOK | TxErr | PCIErr), ioaddr + IntrStatus); + if ((status & (TxOK | TxErr | PCIErr)) != 0) break; + } while (currticks() < to); + + txstatus = inl(ioaddr + TxStatus0 + cur_tx*4); + + if (status & TxOK) { + cur_tx = (cur_tx + 1) % NUM_TX_DESC; +#ifdef DEBUG_TX + printf("tx done (%d ticks), status %hX txstatus %X\n", + to-currticks(), status, txstatus); +#endif + return length; + } else { +#ifdef DEBUG_TX + printf("tx timeout/error (%d ticks), status %hX txstatus %X\n", + currticks()-to, status, txstatus); +#endif + rtl_reset(dev); + + return 0; + } +} + +static int rtl_poll(struct eth_device *dev) +{ + unsigned int status; + unsigned int ring_offs; + unsigned int rx_size, rx_status; + int length=0; + + ioaddr = dev->iobase; + + if (inb(ioaddr + ChipCmd) & RxBufEmpty) { + return 0; + } + + status = inw(ioaddr + IntrStatus); + /* See below for the rest of the interrupt acknowledges. */ + outw(status & ~(RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus); + +#ifdef DEBUG_RX + printf("rtl_poll: int %hX ", status); +#endif + + ring_offs = cur_rx % RX_BUF_LEN; + rx_status = *(unsigned int*)KSEG1ADDR((rx_ring + ring_offs)); + rx_size = rx_status >> 16; + rx_status &= 0xffff; + + if ((rx_status & (RxBadSymbol|RxRunt|RxTooLong|RxCRCErr|RxBadAlign)) || + (rx_size < ETH_ZLEN) || (rx_size > ETH_FRAME_LEN + 4)) { + printf("rx error %hX\n", rx_status); + rtl_reset(dev); /* this clears all interrupts still pending */ + return 0; + } + + /* Received a good packet */ + length = rx_size - 4; /* no one cares about the FCS */ + if (ring_offs+4+rx_size-4 > RX_BUF_LEN) { + int semi_count = RX_BUF_LEN - ring_offs - 4; + unsigned char rxdata[RX_BUF_LEN]; + + memcpy(rxdata, rx_ring + ring_offs + 4, semi_count); + memcpy(&(rxdata[semi_count]), rx_ring, rx_size-4-semi_count); + + NetReceive(rxdata, length); +#ifdef DEBUG_RX + printf("rx packet %d+%d bytes", semi_count,rx_size-4-semi_count); +#endif + } else { + NetReceive(rx_ring + ring_offs + 4, length); +#ifdef DEBUG_RX + printf("rx packet %d bytes", rx_size-4); +#endif + } + + cur_rx = (cur_rx + rx_size + 4 + 3) & ~3; + outw(cur_rx - 16, ioaddr + RxBufPtr); + /* See RTL8139 Programming Guide V0.1 for the official handling of + * Rx overflow situations. The document itself contains basically no + * usable information, except for a few exception handling rules. */ + outw(status & (RxFIFOOver | RxOverflow | RxOK), ioaddr + IntrStatus); + return length; +} + +static void rtl_disable(struct eth_device *dev) +{ + int i; + + /* reset the chip */ + outb(CmdReset, ioaddr + ChipCmd); + + /* Give the chip 10ms to finish the reset. */ + for (i=0; i<100; ++i){ + if ((inb(ioaddr + ChipCmd) & CmdReset) == 0) break; + udelay (100); /* wait 100us */ + } +} +#endif /* CFG_CMD_NET && CONFIG_NET_MULTI && CONFIG_RTL8139 */ |