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Diffstat (limited to 'netboot/rtl8139.c')
| -rw-r--r-- | netboot/rtl8139.c | 458 |
1 files changed, 0 insertions, 458 deletions
diff --git a/netboot/rtl8139.c b/netboot/rtl8139.c deleted file mode 100644 index 62d6e3a..0000000 --- a/netboot/rtl8139.c +++ /dev/null @@ -1,458 +0,0 @@ -/* 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 */ -/*********************************************************************/ - -/* - - 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 "etherboot.h" -#include "nic.h" -#include "pci.h" -#include "cards.h" -#include "timer.h" - -#define RTL_TIMEOUT (1*TICKS_PER_SEC) - -/* 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 - -/* 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))); - -/* I know that this is a MEGA HACK, but the tagged boot image specification - * states that we can do whatever we want below 0x10000 - so we do! */ -/* But we still give the user the choice of using an internal buffer - just in case - Ken */ -#ifdef USE_LOWMEM_BUFFER -#define rx_ring ((unsigned char *)(0x10000 - (RX_BUF_LEN + 16))) -#else -static unsigned char rx_ring[RX_BUF_LEN+16] __attribute__((aligned(4))); -#endif - -struct nic *rtl8139_probe(struct nic *nic, unsigned short *probeaddrs, - struct pci_device *pci); -static int read_eeprom(int location); -static void rtl_reset(struct nic *nic); -static void rtl_transmit(struct nic *nic, const char *destaddr, - unsigned int type, unsigned int len, const char *data); -static int rtl_poll(struct nic *nic); -static void rtl_disable(struct nic*); - - -struct nic *rtl8139_probe(struct nic *nic, unsigned short *probeaddrs, - struct pci_device *pci) -{ - int i; - int speed10, fullduplex; - - /* There are enough "RTL8139" strings on the console already, so - * be brief and concentrate on the interesting pieces of info... */ - printf(" - "); - - /* Mask the bit that says "this is an io addr" */ - ioaddr = probeaddrs[0] & ~3; - - adjust_pci_device(pci); - - /* Bring the chip out of low-power mode. */ - outb(0x00, ioaddr + Config1); - - if (read_eeprom(0) != 0xffff) { - unsigned short *ap = (unsigned short*)nic->node_addr; - for (i = 0; i < 3; i++) - *ap++ = read_eeprom(i + 7); - } else { - unsigned char *ap = (unsigned char*)nic->node_addr; - for (i = 0; i < ETH_ALEN; i++) - *ap++ = inb(ioaddr + MAC0 + i); - } - - speed10 = inb(ioaddr + MediaStatus) & MSRSpeed10; - fullduplex = inw(ioaddr + MII_BMCR) & BMCRDuplex; - printf("ioaddr %#hX, addr %! %sMbps %s-duplex\n", ioaddr, - nic->node_addr, speed10 ? "10" : "100", - fullduplex ? "full" : "half"); - - rtl_reset(nic); - - nic->reset = rtl_reset; - nic->poll = rtl_poll; - nic->transmit = rtl_transmit; - nic->disable = rtl_disable; - - return nic; -} - -/* 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 << 6) -#define EE_READ_CMD (6 << 6) -#define EE_ERASE_CMD (7 << 6) - -static int read_eeprom(int location) -{ - int i; - unsigned int retval = 0; - long ee_addr = ioaddr + Cfg9346; - int read_cmd = location | EE_READ_CMD; - - outb(EE_ENB & ~EE_CS, ee_addr); - outb(EE_ENB, ee_addr); - - /* Shift the read command bits out. */ - for (i = 10; 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); - return retval; -} - -static void rtl_reset(struct nic* nic) -{ - int i; - - outb(CmdReset, ioaddr + ChipCmd); - - cur_rx = 0; - cur_tx = 0; - - /* Give the chip 10ms to finish the reset. */ - load_timer2(10*TICKS_PER_MS); - while ((inb(ioaddr + ChipCmd) & CmdReset) != 0 && timer2_running()) - /* wait */; - - for (i = 0; i < ETH_ALEN; i++) - outb(nic->node_addr[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((unsigned long)rx_ring, ioaddr + RxBuf); - - /* Start the chip's Tx and Rx process. */ - outl(0, ioaddr + RxMissed); - /* set_rx_mode */ - outb(AcceptBroadcast|AcceptMyPhys, ioaddr + RxConfig); - /* 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); - - /* Disable all known interrupts by setting the interrupt mask. */ - outw(0, ioaddr + IntrMask); -} - -static void rtl_transmit(struct nic *nic, const char *destaddr, - unsigned int type, unsigned int len, const char *data) -{ - unsigned int status, to, nstype; - unsigned long txstatus; - - memcpy(tx_buffer, destaddr, ETH_ALEN); - memcpy(tx_buffer + ETH_ALEN, nic->node_addr, ETH_ALEN); - nstype = htons(type); - memcpy(tx_buffer + 2 * ETH_ALEN, (char*)&nstype, 2); - memcpy(tx_buffer + ETH_HLEN, data, len); - - len += ETH_HLEN; -#ifdef DEBUG_TX - printf("sending %d bytes ethtype %hX\n", len, type); -#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((unsigned long)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 - } else { -#ifdef DEBUG_TX - printf("tx timeout/error (%d ticks), status %hX txstatus %X\n", - currticks()-to, status, txstatus); -#endif - rtl_reset(nic); - } -} - -static int rtl_poll(struct nic *nic) -{ - unsigned int status; - unsigned int ring_offs; - unsigned int rx_size, rx_status; - - 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*)(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(nic); /* this clears all interrupts still pending */ - return 0; - } - - /* Received a good packet */ - nic->packetlen = 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; - - memcpy(nic->packet, rx_ring + ring_offs + 4, semi_count); - memcpy(nic->packet+semi_count, rx_ring, rx_size-4-semi_count); -#ifdef DEBUG_RX - printf("rx packet %d+%d bytes", semi_count,rx_size-4-semi_count); -#endif - } else { - memcpy(nic->packet, rx_ring + ring_offs + 4, nic->packetlen); -#ifdef DEBUG_RX - printf("rx packet %d bytes", rx_size-4); -#endif - } -#ifdef DEBUG_RX - printf(" at %X type %hhX%hhX rxstatus %hX\n", - (unsigned long)(rx_ring+ring_offs+4), - nic->packet[12], nic->packet[13], rx_status); -#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 1; -} - -static void rtl_disable(struct nic *nic) -{ - /* reset the chip */ - outb(CmdReset, ioaddr + ChipCmd); - - /* 10 ms timeout */ - load_timer2(10*TICKS_PER_MS); - while ((inb(ioaddr + ChipCmd) & CmdReset) != 0 && timer2_running()) - /* wait */; -} |