freebsd-dev/sys/i386/isa/if_ze.c
Archie Cobbs f1d19042b0 The "easy" fixes for compiling the kernel -Wunused: remove unreferenced static
and local variables, goto labels, and functions declared but not defined.
1998-12-07 21:58:50 +00:00

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/*-
* TODO:
* [1] integrate into current if_ed.c
* [2] parse tuples to find out where to map the shared memory buffer,
* and what to write into the configuration register
* [3] move pcic-specific code into a separate module.
*
* Device driver for IBM PCMCIA Credit Card Adapter for Ethernet,
* if_ze.c
*
* Based on the Device driver for National Semiconductor DS8390 ethernet
* adapters by David Greenman. Modifications for PCMCIA by Keith Moore.
* Adapted for FreeBSD 1.1.5 by Jordan Hubbard.
*
* Currently supports only the IBM Credit Card Adapter for Ethernet, but
* could probably work with other PCMCIA cards also, if it were modified
* to get the locations of the PCMCIA configuration option register (COR)
* by parsing the configuration tuples, rather than by hard-coding in
* the value expected by IBM's card.
*
* Sources for data on the PCMCIA/IBM CCAE specific portions of the driver:
*
* [1] _Local Area Network Credit Card Adapters Technical Reference_,
* IBM Corp., SC30-3585-00, part # 33G9243.
* [2] "pre-alpha" PCMCIA support code for Linux by Barry Jaspan.
* [3] Intel 82536SL PC Card Interface Controller Data Sheet, Intel
* Order Number 290423-002
* [4] National Semiconductor DP83902A ST-NIC (tm) Serial Network
* Interface Controller for Twisted Pair data sheet.
*
*
* Copyright (C) 1993, David Greenman. This software may be used, modified,
* copied, distributed, and sold, in both source and binary form provided
* that the above copyright and these terms are retained. Under no
* circumstances is the author responsible for the proper functioning
* of this software, nor does the author assume any responsibility
* for damages incurred with its use.
*/
/*
* I doubled delay loops in this file because it is not enough for some
* laptop machines' PCIC (especially, on my Chaplet ILFA 350 ^^;).
* HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
*/
/*
* Very small patch for IBM Ethernet PCMCIA Card II and IBM ThinkPad230Cs.
* ETO, Toshihisa <eto@osl.fujitsu.co.jp>
*/
/*
* $Id: if_ze.c,v 1.55 1998/10/22 05:58:39 bde Exp $
*/
/* XXX don't mix different PCCARD support code. */
#include "card.h"
#include "pcic.h"
#if NCARD > 0 || NPCIC > 0
#include "opt_lint.h"
#ifdef COMPILING_LINT
static char const zedummy[] = "code to use the includes of card.h and pcic.h";
#else
#error "Dedicated PCMCIA drivers and generic PCMCIA support can't be mixed"
#endif
#endif
#include "ze.h"
#if NZE > 0
#include "bpfilter.h"
#include "opt_inet.h"
#include "opt_ipx.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <net/if.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <machine/clock.h>
#include <machine/md_var.h>
#include <i386/isa/isa_device.h>
#ifndef SMP
#include <i386/isa/icu.h>
#endif
#include <i386/isa/if_edreg.h>
#include <i386/isa/pcic.h>
#include "apm.h"
#if NAPM > 0
#include <machine/apm_bios.h>
#endif /* NAPM > 0 */
/*****************************************************************************
* Driver for Ethernet Adapter *
*****************************************************************************/
/*
* ze_softc: per line info and status
*/
static struct ze_softc {
struct arpcom arpcom; /* ethernet common */
caddr_t maddr;
u_long iobase, irq;
char *type_str; /* pointer to type string */
char *mau; /* type of media access unit */
u_short nic_addr; /* NIC (DS8390) I/O bus address */
caddr_t smem_start; /* shared memory start address */
caddr_t smem_end; /* shared memory end address */
u_long smem_size; /* total shared memory size */
caddr_t smem_ring; /* start of RX ring-buffer (in smem) */
u_char memwidth; /* width of access to card mem 8 or 16 */
u_char xmit_busy; /* transmitter is busy */
u_char txb_cnt; /* Number of transmit buffers */
u_char txb_next; /* Pointer to next buffer ready to xmit */
u_short txb_next_len; /* next xmit buffer length */
u_char data_buffered; /* data has been buffered in interface memory */
u_char tx_page_start; /* first page of TX buffer area */
u_char rec_page_start; /* first page of RX ring-buffer */
u_char rec_page_stop; /* last page of RX ring-buffer */
u_char next_packet; /* pointer to next unread RX packet */
int slot; /* information for reconfiguration */
u_char last_alive; /* information for reconfiguration */
u_char last_up; /* information for reconfiguration */
#if NAPM > 0
struct apmhook s_hook; /* reconfiguration support */
struct apmhook r_hook; /* reconfiguration support */
#endif /* NAPM > 0 */
} ze_softc[NZE];
static int ze_check_cis __P((unsigned char *scratch));
static int ze_find_adapter __P((unsigned char *scratch, int reconfig));
static int ze_probe __P((struct isa_device *isa_dev));
static void ze_setup __P((struct ze_softc *sc));
static int ze_suspend __P((void *visa_dev));
static int ze_resume __P((void *visa_dev));
static int ze_attach __P((struct isa_device *isa_dev));
static void ze_reset __P((int unit));
static void ze_stop __P((int unit));
static void ze_watchdog __P((struct ifnet *ifp));
static void ze_init __P((int unit));
static __inline void ze_xmit __P((struct ifnet *ifp));
static void ze_start __P((struct ifnet *ifp));
static __inline void ze_rint __P((int unit));
static ointhand2_t zeintr;
static int ze_ioctl __P((struct ifnet *ifp, u_long command, caddr_t data));
static void ze_get_packet __P((struct ze_softc *sc, char *buf, int len));
static __inline char *ze_ring_copy __P((struct ze_softc *sc, char *src,
char *dst, int amount));
static struct mbuf *ze_ring_to_mbuf __P((struct ze_softc *sc, char *src, struct mbuf *dst, int total_len));
struct isa_driver zedriver = {
ze_probe,
ze_attach,
"ze"
};
static unsigned char enet_addr[6];
static unsigned char card_info[256];
#define CARD_INFO "IBM Corp.~Ethernet~0933495"
/*
* IBM Ethernet PCMCIA Card II returns following info.
*/
#define CARD2_INFO "IBM Corp.~Ethernet~0934214"
/* */
#define CARD3_INFO "National Semiconductor~InfoMover NE4"
/*
* scan the card information structure looking for the version/product info
* tuple. when we find it, compare it to the string we are looking for.
* return 1 if we find it, 0 otherwise.
*/
static int
ze_check_cis (unsigned char *scratch)
{
int i,j,k;
card_info[0] = '\0';
i = 0;
while (scratch[i] != 0xff && i < 1024) {
unsigned char link = scratch[i+2];
#if 0
printf ("[%02x] %02x ", i, link);
for (j = 4; j < 2 * link + 4 && j < 32; j += 2)
printf ("%02x ", scratch[j + i]);
printf ("\n");
#endif
if (scratch[i] == 0x15) {
/*
* level 1 version/product info
* copy to card_info, translating '\0' to '~'
*/
k = 0;
for (j = i+8; scratch[j] != 0xff; j += 2)
card_info[k++] = scratch[j] == '\0' ? '~' : scratch[j];
card_info[k++] = '\0';
#if 0
return (bcmp (card_info, CARD_INFO, sizeof(CARD_INFO)-1) == 0);
#else
if ((bcmp (card_info, CARD_INFO, sizeof(CARD_INFO)-1) == 0) ||
(bcmp (card_info, CARD2_INFO, sizeof(CARD2_INFO)-1) == 0) ||
(bcmp (card_info, CARD3_INFO, sizeof(CARD3_INFO)-1) == 0)) {
return 1;
}
return 0;
#endif
}
i += 4 + 2 * link;
}
return 0;
}
/*
* Probe each slot looking for an IBM Credit Card Adapter for Ethernet
* For each card that we find, map its card information structure
* into system memory at 'scratch' and see whether it's one of ours.
* Return the slot number if we find a card, or -1 otherwise.
*
* Side effects:
* + On success, leaves CIS mapped into memory at 'scratch';
* caller must free it.
* + On success, leaves ethernet address in enet_addr.
* + Leaves product/vendor id of last card probed in 'card_info'
*/
static int prev_slot = 0;
static int
ze_find_adapter (unsigned char *scratch, int reconfig)
{
int slot;
for (slot = prev_slot; slot < MAXSLOT; ++slot) {
/*
* see if there's a PCMCIA controller here
* Intel PCMCIA controllers use 0x82 and 0x83
* IBM clone chips use 0x88 and 0x89, apparently
*/
/*
* IBM ThinkPad230Cs use 0x84.
*/
unsigned char idbyte = pcic_getb (slot, PCIC_ID_REV);
if (idbyte != 0x82 && idbyte != 0x83 &&
idbyte != 0x84 && /* for IBM ThinkPad 230Cs */
idbyte != 0x88 && idbyte != 0x89) {
#if 0
printf ("ibmccae: pcic slot %d: wierd id/rev code 0x%02x\n",
slot, idbyte);
#endif
continue;
}
if ((pcic_getb (slot, PCIC_STATUS) & PCIC_CD) != PCIC_CD) {
if (!reconfig) {
printf ("ze: slot %d: no card in slot\n", slot);
}
else {
log (LOG_NOTICE, "ze: slot %d: no card in slot\n", slot);
}
/* no card in slot */
continue;
}
pcic_power_on (slot);
pcic_reset (slot);
/*
* map the card's attribute memory and examine its
* card information structure tuples for something
* we recognize.
*/
pcic_map_memory (slot, 0, kvtop (scratch), 0L,
0xFFFL, ATTRIBUTE, 1);
if ((ze_check_cis (scratch)) > 0) {
/* found it */
if (!reconfig) {
printf ("ze: found card in slot %d\n", slot);
}
else {
log (LOG_NOTICE, "ze: found card in slot %d\n", slot);
}
prev_slot = (prev_slot == MAXSLOT - 1) ? 0 : prev_slot+1;
return slot;
}
else {
if (!reconfig) {
printf ("ze: pcmcia slot %d: %s\n", slot, card_info);
}
else {
log (LOG_NOTICE, "ze: pcmcia slot %d: %s\n", slot, card_info);
}
}
pcic_unmap_memory (slot, 0);
}
prev_slot = 0;
return -1;
}
/*
* macros to handle casting unsigned long to (char *) so we can
* read/write into physical memory space.
*/
#define PEEK(addr) (*((unsigned char *)(addr)))
#define POKE(addr,val) do { PEEK(addr) = (val); } while (0)
/*
* Determine if the device is present
*
* on entry:
* a pointer to an isa_device struct
* on exit:
* NULL if device not found
* or # of i/o addresses used (if found)
pcic(
*/
static int
ze_probe(isa_dev)
struct isa_device *isa_dev;
{
struct ze_softc *sc = &ze_softc[isa_dev->id_unit];
int i;
u_int memsize;
u_char tmp;
int slot;
if ((slot = ze_find_adapter (isa_dev->id_maddr, isa_dev->id_reconfig)) < 0)
return 0;
/*
* okay, we found a card, so set it up
*/
/*
* Inhibit 16 bit memory delay.
* POINTETH.SYS apparently does this, for what reason I don't know.
*/
pcic_putb (slot, PCIC_CDGC,
pcic_getb (slot, PCIC_CDGC) | PCIC_16_DL_INH);
/*
* things to map
* (1) card's EEPROM is already mapped by the find_adapter routine
* but we still need to get the card's ethernet address.
* after that we unmap that part of attribute memory.
* (2) card configuration registers need to be mapped in so we
* can set the configuration and socket # registers.
* (3) shared memory packet buffer
* (4) i/o ports
* (5) IRQ
*/
/*
* Sigh. Location of the ethernet address isn't documented in [1].
* It was derived by doing a hex dump of all of attribute memory
* and looking for the IBM vendor prefix.
*/
enet_addr[0] = PEEK(isa_dev->id_maddr+0xff0);
enet_addr[1] = PEEK(isa_dev->id_maddr+0xff2);
enet_addr[2] = PEEK(isa_dev->id_maddr+0xff4);
enet_addr[3] = PEEK(isa_dev->id_maddr+0xff6);
enet_addr[4] = PEEK(isa_dev->id_maddr+0xff8);
enet_addr[5] = PEEK(isa_dev->id_maddr+0xffa);
pcic_unmap_memory (slot, 0);
sc->maddr = isa_dev->id_maddr;
sc->irq = isa_dev->id_irq;
sc->iobase = isa_dev->id_iobase;
sc->slot = slot;
/*
* Setup i/o addresses
*/
sc->nic_addr = sc->iobase;
sc->smem_start = (caddr_t)sc->maddr;
ze_setup(sc);
tmp = inb (sc->iobase + ZE_RESET);
sc->mau = tmp & 0x09 ? "10base2" : "10baseT";
/* set width/size */
sc->type_str = "IBM PCMCIA";
memsize = 16*1024;
sc->memwidth = 16;
/* allocate 1 xmit buffer */
sc->smem_ring = sc->smem_start + (ED_PAGE_SIZE * ED_TXBUF_SIZE);
sc->txb_cnt = 1;
sc->rec_page_start = ED_TXBUF_SIZE + ZE_PAGE_OFFSET;
sc->smem_size = memsize;
sc->smem_end = sc->smem_start + memsize;
sc->rec_page_stop = memsize / ED_PAGE_SIZE + ZE_PAGE_OFFSET;
sc->tx_page_start = ZE_PAGE_OFFSET;
/* get station address */
for (i = 0; i < ETHER_ADDR_LEN; ++i)
sc->arpcom.ac_enaddr[i] = enet_addr[i];
isa_dev->id_msize = memsize;
/* information for reconfiguration */
sc->last_alive = 0;
sc->last_up = 0;
return 32;
}
static void
ze_setup(struct ze_softc *sc)
{
int re_init_flag = 0,tmp,slot = sc->slot;
re_init:
/*
* (2) map card configuration registers. these are offset
* in card memory space by 0x20000. normally we could get
* this offset from the card information structure, but I'm
* too lazy and am not quite sure if I understand the CIS anyway.
*
* XXX IF YOU'RE TRYING TO PORT THIS DRIVER FOR A DIFFERENT
* PCMCIA CARD, the most likely thing to change is the constant
* 0x20000 in the next statement. Oh yes, also change the
* card id string that we probe for.
*/
pcic_map_memory (slot, 0, kvtop (sc->maddr), 0x20000, 8L,
ATTRIBUTE, 1);
POKE(sc->maddr, 0x80); /* reset the card (how long?) */
DELAY (40000);
/*
* Set the configuration index. According to [1], the adapter won't
* respond to any i/o signals until we do this; it uses the
* Memory Only interface (whatever that is; it's not documented).
* Also turn on "level" (not pulse) interrupts.
*
* XXX probably should init the socket and copy register also,
* so that we can deal with multiple instances of the same card.
*/
POKE(sc->maddr, 0x41);
pcic_unmap_memory (slot, 0);
/*
* (3) now map in the shared memory buffer. This has to be mapped
* as words, not bytes, and on a 16k boundary. The offset value
* was derived by installing IBM's POINTETH.SYS under DOS and
* looking at the PCIC registers; it's not documented in IBM's
* tech ref manual ([1]).
*/
pcic_map_memory (slot, 0, kvtop (sc->maddr), 0x4000L, 0x4000L,
COMMON, 2);
/*
* (4) map i/o ports.
*
* XXX is it possible that the config file leaves this unspecified,
* in which case we have to pick one?
*
* At least one PCMCIA device driver I'v seen maps a block
* of 32 consecutive i/o ports as two windows of 16 ports each.
* Maybe some other pcic chips are restricted to 16-port windows;
* the 82365SL doesn't seem to have that problem. But since
* we have an extra window anyway...
*/
#ifdef SHARED_MEMORY
pcic_map_io (slot, 0, sc->iobase, 32, 1);
#else
pcic_map_io (slot, 0, sc->iobase, 16, 1);
pcic_map_io (slot, 1, sc->iobase+16, 16, 2);
#endif /* SHARED_MEMORY */
/*
* (5) configure the card for the desired interrupt
*
* XXX is it possible that the config file leaves this unspecified?
*/
pcic_map_irq (slot, ffs (sc->irq) - 1);
/* tell the PCIC that this is an I/O card (not memory) */
pcic_putb (slot, PCIC_INT_GEN,
pcic_getb (slot, PCIC_INT_GEN) | PCIC_CARDTYPE);
#if 0
/* tell the PCIC to use level-mode interrupts */
/* XXX this register may not be present on all controllers */
pcic_putb (slot, PCIC_GLO_CTRL,
pcic_getb (slot, PCIC_GLO_CTRL) | PCIC_LVL_MODE);
#endif
#if 0
pcic_print_regs (slot);
#endif
/* reset card to force it into a known state */
tmp = inb (sc->iobase + ZE_RESET);
DELAY(20000);
outb (sc->iobase + ZE_RESET, tmp);
DELAY(20000);
#if 0
tmp = inb(sc->iobase);
printf("CR = 0x%x\n", tmp);
#endif
/*
* query MAM bit in misc register for 10base2
*/
tmp = inb (sc->iobase + ZE_MISC);
/*
* Some Intel-compatible PCICs of Cirrus Logic fails in
* initializing them. This is a quick hack to fix this
* problem.
* HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
*/
if (!tmp && !re_init_flag) {
re_init_flag++;
goto re_init;
}
}
#if NAPM > 0
static int
ze_suspend(visa_dev)
void *visa_dev;
{
struct isa_device *isa_dev = visa_dev;
struct ze_softc *sc = &ze_softc[isa_dev->id_unit];
pcic_power_off(sc->slot);
return 0;
}
static int
ze_resume(visa_dev)
void *visa_dev;
{
struct isa_device *isa_dev = visa_dev;
#if 0
printf("Resume ze:\n");
#endif
prev_slot = 0;
reconfig_isadev(isa_dev, &net_imask);
return 0;
}
#endif /* NAPM > 0 */
/*
* Install interface into kernel networking data structures
*/
static int
ze_attach(isa_dev)
struct isa_device *isa_dev;
{
struct ze_softc *sc = &ze_softc[isa_dev->id_unit];
struct ifnet *ifp = &sc->arpcom.ac_if;
int pl;
isa_dev->id_ointr = zeintr;
/* PCMCIA card can be offlined. Reconfiguration is required */
if (isa_dev->id_reconfig) {
ze_reset(isa_dev->id_unit);
if (!isa_dev->id_alive && sc->last_alive) {
pl = splimp();
sc->last_up = (ifp->if_flags & IFF_UP);
if_down(ifp);
splx(pl);
sc->last_alive = 0;
}
if (isa_dev->id_alive && !sc->last_alive) {
if (sc->last_up) {
pl = splimp();
if_up(ifp);
splx(pl);
}
sc->last_alive = 1;
}
return 1;
}
else {
sc->last_alive = 1;
}
/*
* Set interface to stopped condition (reset)
*/
ze_stop(isa_dev->id_unit);
/*
* Initialize ifnet structure
*/
ifp->if_softc = sc;
ifp->if_unit = isa_dev->id_unit;
ifp->if_name = "ze" ;
ifp->if_mtu = ETHERMTU;
ifp->if_output = ether_output;
ifp->if_start = ze_start;
ifp->if_ioctl = ze_ioctl;
ifp->if_watchdog = ze_watchdog;
ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX);
/*
* Attach the interface
*/
if_attach(ifp);
ether_ifattach(ifp);
/*
* Print additional info when attached
*/
printf("ze%d: address %6D, type %s (%dbit), MAU %s\n",
isa_dev->id_unit,
sc->arpcom.ac_enaddr, ":", sc->type_str,
sc->memwidth,
sc->mau);
/*
* If BPF is in the kernel, call the attach for it
*/
#if NBPFILTER > 0
bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
#endif
#if NAPM > 0
sc->s_hook.ah_fun = ze_suspend;
sc->s_hook.ah_arg = (void *)isa_dev;
sc->s_hook.ah_name = "IBM PCMCIA Ethernet I/II";
sc->s_hook.ah_order = APM_MID_ORDER;
apm_hook_establish(APM_HOOK_SUSPEND , &sc->s_hook);
sc->r_hook.ah_fun = ze_resume;
sc->r_hook.ah_arg = (void *)isa_dev;
sc->r_hook.ah_name = "IBM PCMCIA Ethernet I/II";
sc->r_hook.ah_order = APM_MID_ORDER;
apm_hook_establish(APM_HOOK_RESUME , &sc->r_hook);
#endif /* NAPM > 0 */
return 1;
}
/*
* Reset interface.
*/
static void
ze_reset(unit)
int unit;
{
int s;
s = splnet();
/*
* Stop interface and re-initialize.
*/
ze_stop(unit);
ze_init(unit);
(void) splx(s);
}
/*
* Take interface offline.
*/
static void
ze_stop(unit)
int unit;
{
struct ze_softc *sc = &ze_softc[unit];
int n = 5000;
/*
* Stop everything on the interface, and select page 0 registers.
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STP);
/*
* Wait for interface to enter stopped state, but limit # of checks
* to 'n' (about 5ms). It shouldn't even take 5us on modern
* DS8390's, but just in case it's an old one.
*/
while (((inb(sc->nic_addr + ED_P0_ISR) & ED_ISR_RST) == 0) && --n);
pcic_power_off(sc->slot);
}
/*
* Device timeout/watchdog routine. Entered if the device neglects to
* generate an interrupt after a transmit has been started on it.
*/
static void
ze_watchdog(ifp)
struct ifnet *ifp;
{
#if 1
struct ze_softc *sc = (struct ze_softc *)ifp;
u_char isr, imr;
#ifndef SMP
u_int imask;
#endif
if(!(ifp->if_flags & IFF_UP))
return;
/* select page zero */
outb (sc->nic_addr + ED_P0_CR,
(inb (sc->nic_addr + ED_P0_CR) & 0x3f) | ED_CR_PAGE_0);
/* read interrupt status register */
isr = inb (sc->nic_addr + ED_P0_ISR) & 0xff;
/* select page two */
outb (sc->nic_addr + ED_P0_CR,
(inb (sc->nic_addr + ED_P0_CR) & 0x3f) | ED_CR_PAGE_2);
/* read interrupt mask register */
imr = inb (sc->nic_addr + ED_P2_IMR) & 0xff;
#ifdef SMP
/* INTRGET() is NOT MP_SAFE, forgo printing it for now... */
log (LOG_ERR, "ze%d: device timeout, isr=%02x, imr=%02x\n",
ifp->if_unit, isr, imr);
#else
imask = INTRGET();
log (LOG_ERR, "ze%d: device timeout, isr=%02x, imr=%02x, imask=%04x\n",
ifp->if_unit, isr, imr, imask);
#endif /* SMP */
#else
log(LOG_ERR, "ze%d: device timeout\n", ifp->if_unit);
#endif
ze_reset(ifp->if_unit);
}
/*
* Initialize device.
*/
static void
ze_init(unit)
int unit;
{
struct ze_softc *sc = &ze_softc[unit];
struct ifnet *ifp = &sc->arpcom.ac_if;
int i, s;
pcic_power_on(sc->slot);
pcic_reset(sc->slot);
if(!(sc->arpcom.ac_if.if_flags & IFF_UP))
Debugger("here!!");
ze_setup(sc);
/* address not known */
if (TAILQ_EMPTY(&ifp->if_addrhead)) return; /* XXX unlikely! */
/*
* Initialize the NIC in the exact order outlined in the NS manual.
* This init procedure is "mandatory"...don't change what or when
* things happen.
*/
s = splnet();
/* reset transmitter flags */
sc->data_buffered = 0;
sc->xmit_busy = 0;
sc->arpcom.ac_if.if_timer = 0;
sc->txb_next = 0;
/* This variable is used below - don't move this assignment */
sc->next_packet = sc->rec_page_start + 1;
/*
* Set interface for page 0, Remote DMA complete, Stopped
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STP);
if (sc->memwidth == 16) {
/*
* Set FIFO threshold to 8, No auto-init Remote DMA,
* byte order=80x86, word-wide DMA xfers
*/
outb(sc->nic_addr + ED_P0_DCR, ED_DCR_FT1|ED_DCR_WTS);
} else {
/*
* Same as above, but byte-wide DMA xfers
*/
outb(sc->nic_addr + ED_P0_DCR, ED_DCR_FT1);
}
/*
* Clear Remote Byte Count Registers
*/
outb(sc->nic_addr + ED_P0_RBCR0, 0);
outb(sc->nic_addr + ED_P0_RBCR1, 0);
/*
* Enable reception of broadcast packets
*/
outb(sc->nic_addr + ED_P0_RCR, ED_RCR_AB);
/*
* Place NIC in internal loopback mode
*/
outb(sc->nic_addr + ED_P0_TCR, ED_TCR_LB0);
/*
* Initialize transmit/receive (ring-buffer) Page Start
*/
outb(sc->nic_addr + ED_P0_TPSR, sc->tx_page_start);
outb(sc->nic_addr + ED_P0_PSTART, sc->rec_page_start);
/*
* Initialize Receiver (ring-buffer) Page Stop and Boundry
*/
outb(sc->nic_addr + ED_P0_PSTOP, sc->rec_page_stop);
outb(sc->nic_addr + ED_P0_BNRY, sc->rec_page_start);
/*
* Clear all interrupts. A '1' in each bit position clears the
* corresponding flag.
*/
outb(sc->nic_addr + ED_P0_ISR, 0xff);
/*
* Enable the following interrupts: receive/transmit complete,
* receive/transmit error, and Receiver OverWrite.
*
* Counter overflow and Remote DMA complete are *not* enabled.
*/
outb(sc->nic_addr + ED_P0_IMR,
ED_IMR_PRXE|ED_IMR_PTXE|ED_IMR_RXEE|ED_IMR_TXEE|ED_IMR_OVWE);
/*
* Program Command Register for page 1
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_RD2|ED_CR_STP);
/*
* Copy out our station address
*/
for (i = 0; i < ETHER_ADDR_LEN; ++i)
outb(sc->nic_addr + ED_P1_PAR0 + i, sc->arpcom.ac_enaddr[i]);
#if NBPFILTER > 0
/*
* Initialize multicast address hashing registers to accept
* all multicasts (only used when in promiscuous mode)
*/
for (i = 0; i < 8; ++i)
outb(sc->nic_addr + ED_P1_MAR0 + i, 0xff);
#endif
/*
* Set Current Page pointer to next_packet (initialized above)
*/
outb(sc->nic_addr + ED_P1_CURR, sc->next_packet);
/*
* Set Command Register for page 0, Remote DMA complete,
* and interface Start.
*/
outb(sc->nic_addr + ED_P1_CR, ED_CR_RD2|ED_CR_STA);
/*
* Take interface out of loopback
*/
outb(sc->nic_addr + ED_P0_TCR, 0);
/*
* Set 'running' flag, and clear output active flag.
*/
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
/*
* ...and attempt to start output
*/
ze_start(ifp);
(void) splx(s);
}
/*
* This routine actually starts the transmission on the interface
*/
static __inline void
ze_xmit(ifp)
struct ifnet *ifp;
{
struct ze_softc *sc = ifp->if_softc;
u_short len = sc->txb_next_len;
/*
* Set NIC for page 0 register access
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
/*
* Set TX buffer start page
*/
outb(sc->nic_addr + ED_P0_TPSR, sc->tx_page_start +
sc->txb_next * ED_TXBUF_SIZE);
/*
* Set TX length
*/
outb(sc->nic_addr + ED_P0_TBCR0, len & 0xff);
outb(sc->nic_addr + ED_P0_TBCR1, len >> 8);
/*
* Set page 0, Remote DMA complete, Transmit Packet, and *Start*
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_TXP|ED_CR_STA);
sc->xmit_busy = 1;
sc->data_buffered = 0;
/*
* Switch buffers if we are doing double-buffered transmits
*/
if ((sc->txb_next == 0) && (sc->txb_cnt > 1))
sc->txb_next = 1;
else
sc->txb_next = 0;
/*
* Set a timer just in case we never hear from the board again
*/
ifp->if_timer = 2;
}
/*
* Start output on interface.
* We make two assumptions here:
* 1) that the current priority is set to splnet _before_ this code
* is called *and* is returned to the appropriate priority after
* return
* 2) that the IFF_OACTIVE flag is checked before this code is called
* (i.e. that the output part of the interface is idle)
*/
static void
ze_start(ifp)
struct ifnet *ifp;
{
struct ze_softc *sc = ifp->if_softc;
struct mbuf *m0, *m;
caddr_t buffer;
int len;
outloop:
/*
* See if there is room to send more data (i.e. one or both of the
* buffers is empty).
*/
if (sc->data_buffered)
if (sc->xmit_busy) {
/*
* No room. Indicate this to the outside world
* and exit.
*/
ifp->if_flags |= IFF_OACTIVE;
return;
} else {
/*
* Data is buffered, but we're not transmitting, so
* start the xmit on the buffered data.
* Note that ze_xmit() resets the data_buffered flag
* before returning.
*/
ze_xmit(ifp);
}
IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m);
if (m == NULL) {
/*
* The following isn't pretty; we are using the !OACTIVE flag to
* indicate to the outside world that we can accept an additional
* packet rather than that the transmitter is _actually_
* active. Indeed, the transmitter may be active, but if we haven't
* filled the secondary buffer with data then we still want to
* accept more.
* Note that it isn't necessary to test the data_buffered flag -
* we wouldn't have tried to de-queue the packet in the first place
* if it was set.
*/
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
/*
* Copy the mbuf chain into the transmit buffer
*/
buffer = sc->smem_start + (sc->txb_next * ED_TXBUF_SIZE * ED_PAGE_SIZE);
len = 0;
for (m0 = m; m != 0; m = m->m_next) {
bcopy(mtod(m, caddr_t), buffer, m->m_len);
buffer += m->m_len;
len += m->m_len;
}
sc->txb_next_len = max(len, ETHER_MIN_LEN);
if (sc->txb_cnt > 1)
/*
* only set 'buffered' flag if doing multiple buffers
*/
sc->data_buffered = 1;
if (sc->xmit_busy == 0)
ze_xmit(ifp);
/*
* If there is BPF support in the configuration, tap off here.
*/
#if NBPFILTER > 0
if (ifp->if_bpf) {
bpf_mtap(ifp, m0);
}
#endif
m_freem(m0);
/*
* If we are doing double-buffering, a buffer might be free to
* fill with another packet, so loop back to the top.
*/
if (sc->txb_cnt > 1)
goto outloop;
else {
ifp->if_flags |= IFF_OACTIVE;
return;
}
}
/*
* Ethernet interface receiver interrupt.
*/
static __inline void /* only called from one place, so may as well inline */
ze_rint(unit)
int unit;
{
register struct ze_softc *sc = &ze_softc[unit];
u_char boundry;
u_short len;
struct ed_ring *packet_ptr;
/*
* Set NIC to page 1 registers to get 'current' pointer
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_RD2|ED_CR_STA);
/*
* 'sc->next_packet' is the logical beginning of the ring-buffer - i.e.
* it points to where new data has been buffered. The 'CURR'
* (current) register points to the logical end of the ring-buffer
* - i.e. it points to where additional new data will be added.
* We loop here until the logical beginning equals the logical
* end (or in other words, until the ring-buffer is empty).
*/
while (sc->next_packet != inb(sc->nic_addr + ED_P1_CURR)) {
/* get pointer to this buffer header structure */
packet_ptr = (struct ed_ring *)(sc->smem_ring +
(sc->next_packet - sc->rec_page_start) * ED_PAGE_SIZE);
/*
* The byte count includes the FCS - Frame Check Sequence (a
* 32 bit CRC).
*/
len = packet_ptr->count;
if ((len >= ETHER_MIN_LEN) && (len <= ETHER_MAX_LEN)) {
/*
* Go get packet. len - 4 removes CRC from length.
* (packet_ptr + 1) points to data just after the packet ring
* header (+4 bytes)
*/
ze_get_packet(sc, (caddr_t)(packet_ptr + 1), len - 4);
++sc->arpcom.ac_if.if_ipackets;
} else {
/*
* Really BAD...probably indicates that the ring pointers
* are corrupted. Also seen on early rev chips under
* high load - the byte order of the length gets switched.
*/
log(LOG_ERR,
"ze%d: shared memory corrupt - invalid packet length %d\n",
unit, len);
ze_reset(unit);
return;
}
/*
* Update next packet pointer
*/
sc->next_packet = packet_ptr->next_packet;
/*
* Update NIC boundry pointer - being careful to keep it
* one buffer behind. (as recommended by NS databook)
*/
boundry = sc->next_packet - 1;
if (boundry < sc->rec_page_start)
boundry = sc->rec_page_stop - 1;
/*
* Set NIC to page 0 registers to update boundry register
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
outb(sc->nic_addr + ED_P0_BNRY, boundry);
/*
* Set NIC to page 1 registers before looping to top (prepare to
* get 'CURR' current pointer)
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_PAGE_1|ED_CR_RD2|ED_CR_STA);
}
}
/*
* Ethernet interface interrupt processor
*/
static void
zeintr(unit)
int unit;
{
struct ze_softc *sc = &ze_softc[unit];
u_char isr;
if(!(sc->arpcom.ac_if.if_flags & IFF_UP))
return;
/*
* Set NIC to page 0 registers
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
/*
* loop until there are no more new interrupts
*/
while (isr = inb(sc->nic_addr + ED_P0_ISR)) {
/*
* reset all the bits that we are 'acknowleging'
* by writing a '1' to each bit position that was set
* (writing a '1' *clears* the bit)
*/
outb(sc->nic_addr + ED_P0_ISR, isr);
/*
* Transmit error. If a TX completed with an error, we end up
* throwing the packet away. Really the only error that is
* possible is excessive collisions, and in this case it is
* best to allow the automatic mechanisms of TCP to backoff
* the flow. Of course, with UDP we're screwed, but this is
* expected when a network is heavily loaded.
*/
if (isr & ED_ISR_TXE) {
u_char tsr = inb(sc->nic_addr + ED_P0_TSR);
u_char ncr = inb(sc->nic_addr + ED_P0_NCR);
/*
* Excessive collisions (16)
*/
if ((tsr & ED_TSR_ABT) && (ncr == 0)) {
/*
* When collisions total 16, the P0_NCR will
* indicate 0, and the TSR_ABT is set.
*/
sc->arpcom.ac_if.if_collisions += 16;
} else
sc->arpcom.ac_if.if_collisions += ncr;
/*
* update output errors counter
*/
++sc->arpcom.ac_if.if_oerrors;
/*
* reset tx busy and output active flags
*/
sc->xmit_busy = 0;
sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
/*
* clear watchdog timer
*/
sc->arpcom.ac_if.if_timer = 0;
}
/*
* Receiver Error. One or more of: CRC error, frame alignment error
* FIFO overrun, or missed packet.
*/
if (isr & ED_ISR_RXE) {
++sc->arpcom.ac_if.if_ierrors;
#ifdef ZE_DEBUG
printf("ze%d: receive error %b\n", unit,
inb(sc->nic_addr + ED_P0_RSR),
"\20\8DEF\7REC DISAB\6PHY/MC\5MISSED\4OVR\3ALIGN\2FCS\1RCVD");
#endif
}
/*
* Overwrite warning. In order to make sure that a lockup
* of the local DMA hasn't occurred, we reset and
* re-init the NIC. The NSC manual suggests only a
* partial reset/re-init is necessary - but some
* chips seem to want more. The DMA lockup has been
* seen only with early rev chips - Methinks this
* bug was fixed in later revs. -DG
*/
if (isr & ED_ISR_OVW) {
++sc->arpcom.ac_if.if_ierrors;
/*
* Stop/reset/re-init NIC
*/
ze_reset(unit);
}
/*
* Transmission completed normally.
*/
if (isr & ED_ISR_PTX) {
/*
* reset tx busy and output active flags
*/
sc->xmit_busy = 0;
sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
/*
* clear watchdog timer
*/
sc->arpcom.ac_if.if_timer = 0;
/*
* Update total number of successfully transmitted
* packets.
*/
++sc->arpcom.ac_if.if_opackets;
/*
* Add in total number of collisions on last
* transmission.
*/
sc->arpcom.ac_if.if_collisions += inb(sc->nic_addr +
ED_P0_TBCR0);
}
/*
* Receive Completion. Go and get the packet.
* XXX - Doing this on an error is dubious because there
* shouldn't be any data to get (we've configured the
* interface to not accept packets with errors).
*/
if (isr & (ED_ISR_PRX|ED_ISR_RXE)) {
ze_rint (unit);
}
/*
* If it looks like the transmitter can take more data,
* attempt to start output on the interface. If data is
* already buffered and ready to go, send it first.
*/
if ((sc->arpcom.ac_if.if_flags & IFF_OACTIVE) == 0) {
if (sc->data_buffered)
ze_xmit(&sc->arpcom.ac_if);
ze_start(&sc->arpcom.ac_if);
}
/*
* return NIC CR to standard state: page 0, remote DMA complete,
* start (toggling the TXP bit off, even if was just set
* in the transmit routine, is *okay* - it is 'edge'
* triggered from low to high)
*/
outb(sc->nic_addr + ED_P0_CR, ED_CR_RD2|ED_CR_STA);
/*
* If the Network Talley Counters overflow, read them to
* reset them. It appears that old 8390's won't
* clear the ISR flag otherwise - resulting in an
* infinite loop.
*/
if (isr & ED_ISR_CNT) {
(void) inb(sc->nic_addr + ED_P0_CNTR0);
(void) inb(sc->nic_addr + ED_P0_CNTR1);
(void) inb(sc->nic_addr + ED_P0_CNTR2);
}
}
}
/*
* Process an ioctl request. This code needs some work - it looks
* pretty ugly.
*/
static int
ze_ioctl(ifp, command, data)
register struct ifnet *ifp;
u_long command;
caddr_t data;
{
register struct ifaddr *ifa = (struct ifaddr *)data;
struct ze_softc *sc = ifp->if_softc;
int s, error = 0;
s = splnet();
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
ze_init(ifp->if_unit); /* before arpwhohas */
arp_ifinit((struct arpcom*) ifp, ifa);
break;
#endif
#ifdef IPX
/*
* XXX - This code is probably wrong
*/
case AF_IPX:
{
register struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
if (ipx_nullhost(*ina))
ina->x_host =
*(union ipx_host *)(sc->arpcom.ac_enaddr);
else {
/*
*
*/
bcopy((caddr_t)ina->x_host.c_host,
(caddr_t)sc->arpcom.ac_enaddr,
sizeof(sc->arpcom.ac_enaddr));
}
/*
* Set new address
*/
ze_init(ifp->if_unit);
break;
}
#endif
#ifdef NS
/*
* XXX - This code is probably wrong
*/
case AF_NS:
{
register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
if (ns_nullhost(*ina))
ina->x_host =
*(union ns_host *)(sc->arpcom.ac_enaddr);
else {
/*
*
*/
bcopy((caddr_t)ina->x_host.c_host,
(caddr_t)sc->arpcom.ac_enaddr,
sizeof(sc->arpcom.ac_enaddr));
}
/*
* Set new address
*/
ze_init(ifp->if_unit);
break;
}
#endif
default:
ze_init(ifp->if_unit);
break;
}
break;
case SIOCSIFFLAGS:
/*
* When the card is offlined, `up' operation can't be permitted
*/
if (!sc->last_alive) {
int tmp;
tmp = (ifp->if_flags & IFF_UP);
if (!sc->last_up && (ifp->if_flags & IFF_UP)) {
ifp->if_flags &= ~(IFF_UP);
}
sc->last_up = tmp;
}
/*
* If interface is marked down and it is running, then stop it
*/
if (((ifp->if_flags & IFF_UP) == 0) &&
(ifp->if_flags & IFF_RUNNING)) {
ze_stop(ifp->if_unit);
ifp->if_flags &= ~IFF_RUNNING;
} else {
/*
* If interface is marked up and it is stopped, then start it
*/
if ((ifp->if_flags & IFF_UP) &&
((ifp->if_flags & IFF_RUNNING) == 0))
ze_init(ifp->if_unit);
}
#if NBPFILTER > 0
if (ifp->if_flags & IFF_PROMISC) {
/*
* Set promiscuous mode on interface.
* XXX - for multicasts to work, we would need to
* write 1's in all bits of multicast
* hashing array. For now we assume that
* this was done in ze_init().
*/
outb(sc->nic_addr + ED_P0_RCR,
ED_RCR_PRO|ED_RCR_AM|ED_RCR_AB);
} else {
/*
* XXX - for multicasts to work, we would need to
* rewrite the multicast hashing array with the
* proper hash (would have been destroyed above).
*/
outb(sc->nic_addr + ED_P0_RCR, ED_RCR_AB);
}
#endif
break;
default:
error = EINVAL;
}
(void) splx(s);
return (error);
}
/*
* Macro to calculate a new address within shared memory when given an offset
* from an address, taking into account ring-wrap.
*/
#define ringoffset(sc, start, off, type) \
((type)( ((caddr_t)(start)+(off) >= (sc)->smem_end) ? \
(((caddr_t)(start)+(off))) - (sc)->smem_end \
+ (sc)->smem_ring: \
((caddr_t)(start)+(off)) ))
/*
* Retreive packet from shared memory and send to the next level up via
* ether_input(). If there is a BPF listener, give a copy to BPF, too.
*/
static void
ze_get_packet(sc, buf, len)
struct ze_softc *sc;
char *buf;
u_short len;
{
struct ether_header *eh;
struct mbuf *m, *head = NULL;
/* Allocate a header mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
goto bad;
m->m_pkthdr.rcvif = &sc->arpcom.ac_if;
m->m_pkthdr.len = len;
m->m_len = 0;
head = m;
eh = (struct ether_header *)buf;
/* The following sillines is to make NFS happy */
#define EROUND ((sizeof(struct ether_header) + 3) & ~3)
#define EOFF (EROUND - sizeof(struct ether_header))
/*
* The following assumes there is room for
* the ether header in the header mbuf
*/
head->m_data += EOFF;
bcopy(buf, mtod(head, caddr_t), sizeof(struct ether_header));
buf += sizeof(struct ether_header);
head->m_len += sizeof(struct ether_header);
len -= sizeof(struct ether_header);
/*
* Pull packet off interface. Or if this was a trailer packet,
* the data portion is appended.
*/
m = ze_ring_to_mbuf(sc, buf, m, len);
if (m == NULL) goto bad;
#if NBPFILTER > 0
/*
* Check if there's a BPF listener on this interface.
* If so, hand off the raw packet to bpf.
*/
if (sc->arpcom.ac_if.if_bpf) {
bpf_mtap(&sc->arpcom.ac_if, head);
/*
* Note that the interface cannot be in promiscuous mode if
* there are no BPF listeners. And if we are in promiscuous
* mode, we have to check if this packet is really ours.
*
* XXX This test does not support multicasts.
*/
if ((sc->arpcom.ac_if.if_flags & IFF_PROMISC) &&
bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr,
sizeof(eh->ether_dhost)) != 0 &&
bcmp(eh->ether_dhost, etherbroadcastaddr,
sizeof(eh->ether_dhost)) != 0) {
m_freem(head);
return;
}
}
#endif
/*
* Fix up data start offset in mbuf to point past ether header
*/
m_adj(head, sizeof(struct ether_header));
ether_input(&sc->arpcom.ac_if, eh, head);
return;
bad: if (head)
m_freem(head);
return;
}
/*
* Supporting routines
*/
/*
* Given a source and destination address, copy 'amount' of a packet from
* the ring buffer into a linear destination buffer. Takes into account
* ring-wrap.
*/
static __inline char *
ze_ring_copy(sc,src,dst,amount)
struct ze_softc *sc;
char *src;
char *dst;
u_short amount;
{
u_short tmp_amount;
/* does copy wrap to lower addr in ring buffer? */
if (src + amount > sc->smem_end) {
tmp_amount = sc->smem_end - src;
bcopy(src,dst,tmp_amount); /* copy amount up to end of smem */
amount -= tmp_amount;
src = sc->smem_ring;
dst += tmp_amount;
}
bcopy(src, dst, amount);
return(src + amount);
}
/*
* Copy data from receive buffer to end of mbuf chain
* allocate additional mbufs as needed. return pointer
* to last mbuf in chain.
* sc = ze info (softc)
* src = pointer in ze ring buffer
* dst = pointer to last mbuf in mbuf chain to copy to
* amount = amount of data to copy
*/
static struct mbuf *
ze_ring_to_mbuf(sc,src,dst,total_len)
struct ze_softc *sc;
char *src;
struct mbuf *dst;
u_short total_len;
{
register struct mbuf *m = dst;
while (total_len) {
register u_short amount = min(total_len, M_TRAILINGSPACE(m));
if (amount == 0) { /* no more data in this mbuf, alloc another */
/*
* If there is enough data for an mbuf cluster, attempt
* to allocate one of those, otherwise, a regular
* mbuf will do.
* Note that a regular mbuf is always required, even if
* we get a cluster - getting a cluster does not
* allocate any mbufs, and one is needed to assign
* the cluster to. The mbuf that has a cluster
* extension can not be used to contain data - only
* the cluster can contain data.
*/
dst = m;
MGET(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return (0);
if (total_len >= MINCLSIZE)
MCLGET(m, M_DONTWAIT);
m->m_len = 0;
dst->m_next = m;
amount = min(total_len, M_TRAILINGSPACE(m));
}
src = ze_ring_copy(sc, src, mtod(m, caddr_t) + m->m_len, amount);
m->m_len += amount;
total_len -= amount;
}
return (m);
}
#endif