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freebsd-dev/sys/i386/isa/if_rdp.c
Bruce Evans 55a6f50b8d Don't use pessimal (u_short) types for i/o ports. This is mainly for 
completenss.  The pessimization is tiny compared with i/o port slowness
except on very old machines, but code that used signed short types for
i/o ports was unpessimized long ago, and the macro that detected it
recently started working for u_short types too.  Use of bus space
should have made this moot long ago.

Not tested at runtime by:  bde
2003-08-05 20:11:50 +00:00

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/*
* Copyright 1998, Joerg Wunsch
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Device driver for RealTek RTL 8002 (`REDP') based pocket-ethernet
* adapters, hooked up to a printer port. `rdp' is a shorthand for
* REDP since some tools like netstat work best if the interface name
* has no more than three letters.
*
* Driver configuration flags so far:
* flags 0x1 -- assume 74S288 EEPROM (default 94C46)
* flags 0x2 -- use `slow' mode (mode 3 of the packet driver, default 0)
*
* Maybe this driver will some day also work with the successor, RTL
* 8012 (`AREDP'), which is unfortunately not fully register-
* compatible with the 8002. The 8012 offers support for faster
* transfer modi like bidirectional SPP and EPP, 64 K x 4 buffer
* memory as opposed to 16 K x 4 for the 8002, a multicast filter, and
* a builtin multiplexer that allows chaining a printer behind the
* ethernet adapter.
*
* About the only documentation i've been able to find about the RTL
* 8002 was the packet driver source code at ftp.realtek.com.tw, so
* this driver is somewhat based on the way the packet driver handles
* the chip. The exact author of the packet driver is unknown, the
* only name that i could find in the source was someone called Chiu,
* supposedly an employee of RealTek. So credits to them for that
* piece of code which has proven valuable to me.
*
* Later on, Leo kuo <leo@realtek.com.tw> has been very helpful to me
* by sending me a readable (PDF) file documenting the RTL 8012, which
* helped me to also understand the 8002, as well as by providing me
* with the source code of the 8012 packet driver that i haven't been
* able to find on the FTP site. A big Thanks! goes here to RealTek
* for this kind of service.
*/
#include "rdp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/bus.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_mib.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#include <net/bpf.h>
#include <machine/md_var.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/icu.h>
#include <i386/isa/if_rdpreg.h>
#include <i386/isa/intr_machdep.h>
#ifndef COMPAT_OLDISA
#error "The rdp device requires the old isa compatibility shims"
#endif
#define IOCTL_CMD_T u_long
/*
* Debug levels (ORed together):
* != 0 - general (bad packets etc.)
* 2 - debug EEPROM IO
* 4 - debug interrupt status
*/
#undef DEBUG
#define DEBUG 0
/*
* rdp_softc: per interface info and status
*/
struct rdp_softc {
struct arpcom arpcom; /*
* Ethernet common, always goes first so
* a rdp_softc * can be cast into an
* arpcom * or into an ifnet *.
*/
/*
* local stuff, somewhat sorted by memory alignment class
*/
u_int baseaddr; /* IO port address */
u_short txsize; /* tx size for next (buffered) packet,
* there's only one additional packet
* we can buffer, thus a single variable
* ought to be enough */
int txbusy; /* tx is transmitting */
int txbuffered; /* # of packets in tx buffer */
int slow; /* use lpt_control to send data */
u_char irqenbit; /* mirror of current Ctrl_IRQEN */
/*
* type of parameter EEPROM; device flags 0x1 selects 74S288
*/
enum {
EEPROM_93C46, EEPROM_74S288 /* or 82S123 */
} eeprom;
};
static struct rdp_softc rdp_softc[NRDP];
/*
* Since there's no fixed location in the EEPROM about where to find
* the ethernet hardware address, we drop a table of valid OUIs here,
* and search through the EEPROM until we find a possible valid
* Ethernet address. Only the first 16 bits of all possible OUIs are
* recorded in the table (as obtained from
* http://standards.ieee.org/regauth/oui/oui.txt).
*/
static u_short allowed_ouis[] = {
0x0000, 0x0001, 0x0002, 0x0004, 0x0005, 0x0006, 0x0007,
0x0008, 0x0010, 0x001C, 0x0020, 0x0040, 0x0050, 0x0060,
0x0070, 0x0080, 0x0090, 0x009D, 0x00A0, 0x00AA, 0x00BB,
0x00C0, 0x00CF, 0x00DD, 0x00E0, 0x00E6, 0x0207, 0x021C,
0x0260, 0x0270, 0x029D, 0x02AA, 0x02BB, 0x02C0, 0x02CF,
0x02E6, 0x040A, 0x04E0, 0x0800, 0x08BB, 0x1000, 0x1100,
0x8000, 0xAA00
};
/*
* ISA bus support.
*/
static int rdp_probe(struct isa_device *);
static int rdp_attach(struct isa_device *);
/*
* Required entry points.
*/
static void rdp_init(void *);
static int rdp_ioctl(struct ifnet *, IOCTL_CMD_T, caddr_t);
static void rdp_start(struct ifnet *);
static void rdp_reset(struct ifnet *);
static void rdp_watchdog(struct ifnet *);
static void rdpintr(int);
/*
* REDP private functions.
*/
static void rdp_stop(struct rdp_softc *);
static void rdp_rint(struct rdp_softc *);
static void rdp_get_packet(struct rdp_softc *, unsigned);
static u_short rdp_write_mbufs(struct rdp_softc *, struct mbuf *);
static int rdp_gethwaddr_93c46(struct rdp_softc *, u_char *);
static void rdp_gethwaddr_74s288(struct rdp_softc *, u_char *);
static void rdp_93c46_cmd(struct rdp_softc *, u_short, unsigned);
static u_short rdp_93c46_read(struct rdp_softc *);
struct isa_driver rdpdriver = {
INTR_TYPE_NET,
rdp_probe,
rdp_attach,
"rdp",
1 /* we wanna get a chance before lptN */
};
COMPAT_ISA_DRIVER(rdp, rdpdriver);
/*
* REDP-specific functions.
*
* They are inlined, thus go first in this file. Together with gcc's
* usual optimization, these functions probably come close to the
* packet driver's hand-optimized code. ;-)
*
* Comments are partially obtained from the packet driver as well.
* Some of the function names contain register names which don't make
* much sense for us, but i've kept them for easier reference in
* comparision to the packet driver.
*
* Some of the functions are currently not used by the driver; it's
* not quite clear whether we ever need them at all. They are
* supposedly even slower than what is currently implemented as `slow'
* mode. Right now, `fast' (default) mode is what the packet driver
* calls mode 0, slow mode is mode 3 (writing through lpt_control,
* reading twice).
*
* We should autoprobe the modi, as opposed to making them dependent
* on a kernel configuration flag.
*/
/*
* read a nibble from rreg; end-of-data cmd is not issued;
* used for general register read.
*
* Unlike the packet driver's version, i'm shifting the result
* by 3 here (as opposed to within the caller's code) for clarity.
* -- Joerg
*/
static __inline u_char
RdNib(struct rdp_softc *sc, u_char rreg)
{
outb(sc->baseaddr + lpt_data, EOC + rreg);
outb(sc->baseaddr + lpt_data, RdAddr + rreg); /* write addr */
(void)inb(sc->baseaddr + lpt_status);
return (inb(sc->baseaddr + lpt_status) >> 3) & 0x0f;
}
#if 0
/*
* read a byte from MAR register through lpt_data; the low nibble is
* read prior to the high one; end-of-read command is not issued; used
* for remote DMA in mode 4 + 5
*/
static __inline u_char
RdByte(struct rdp_softc *sc)
{
u_char hinib, lonib;
outb(sc->baseaddr + lpt_data, RdAddr + MAR); /* cmd for low nibble */
lonib = (inb(sc->baseaddr + lpt_status) >> 3) & 0x0f;
outb(sc->baseaddr + lpt_data, RdAddr + MAR + HNib);
hinib = (inb(sc->baseaddr + lpt_status) << 1) & 0xf0;
return hinib + lonib;
}
/*
* read a byte from MAR register through lpt_data; the low nibble is
* read prior to the high one; end-of-read command is not issued; used
* for remote DMA in mode 6 + 7
*/
static __inline u_char
RdByte1(struct rdp_softc *sc)
{
u_char hinib, lonib;
outb(sc->baseaddr + lpt_data, RdAddr + MAR); /* cmd for low nibble */
(void)inb(sc->baseaddr + lpt_status);
lonib = (inb(sc->baseaddr + lpt_status) >> 3) & 0x0f;
outb(sc->baseaddr + lpt_data, RdAddr + MAR + HNib);
(void)inb(sc->baseaddr + lpt_status);
hinib = (inb(sc->baseaddr + lpt_status) << 1) & 0xf0;
return hinib + lonib;
}
#endif
/*
* read a byte from MAR register through lpt_control; the low nibble is
* read prior to the high one; end-of-read command is not issued; used
* for remote DMA in mode 0 + 1
*/
static __inline u_char
RdByteA1(struct rdp_softc *sc)
{
u_char hinib, lonib;
outb(sc->baseaddr + lpt_control, Ctrl_LNibRead);
lonib = (inb(sc->baseaddr + lpt_status) >> 3) & 0x0f;
outb(sc->baseaddr + lpt_control, Ctrl_HNibRead);
hinib = (inb(sc->baseaddr + lpt_status) << 1) & 0xf0;
return hinib + lonib;
}
/*
* read a byte from MAR register through lpt_control; the low nibble is
* read prior to the high one; end-of-read command is not issued; used
* for remote DMA in mode 2 + 3
*/
static __inline u_char
RdByteA2(struct rdp_softc *sc)
{
u_char hinib, lonib;
outb(sc->baseaddr + lpt_control, Ctrl_LNibRead);
(void)inb(sc->baseaddr + lpt_status);
lonib = (inb(sc->baseaddr + lpt_status) >> 3) & 0x0f;
outb(sc->baseaddr + lpt_control, Ctrl_HNibRead);
(void)inb(sc->baseaddr + lpt_status);
hinib = (inb(sc->baseaddr + lpt_status) << 1) & 0xf0;
return hinib + lonib;
}
/*
* End-of-read cmd
*/
static __inline void
RdEnd(struct rdp_softc *sc, u_char rreg)
{
outb(sc->baseaddr + lpt_data, EOC + rreg);
}
/*
* Write a nibble to a register; end-of-write is issued.
* Used for general register write.
*/
static __inline void
WrNib(struct rdp_softc *sc, u_char wreg, u_char wdata)
{
/* prepare and write address */
outb(sc->baseaddr + lpt_data, EOC + wreg);
outb(sc->baseaddr + lpt_data, WrAddr + wreg);
outb(sc->baseaddr + lpt_data, WrAddr + wreg);
/* prepare and write data */
outb(sc->baseaddr + lpt_data, WrAddr + wdata);
outb(sc->baseaddr + lpt_data, wdata);
outb(sc->baseaddr + lpt_data, wdata);
/* end-of-write */
outb(sc->baseaddr + lpt_data, EOC + wdata);
}
/*
* Write a byte to a register; end-of-write is issued.
* Used for general register write.
*/
static __inline void
WrByte(struct rdp_softc *sc, u_char wreg, u_char wdata)
{
/* prepare and write address */
outb(sc->baseaddr + lpt_data, EOC + wreg);
outb(sc->baseaddr + lpt_data, WrAddr + wreg);
outb(sc->baseaddr + lpt_data, WrAddr + wreg);
/* prepare and write low nibble */
outb(sc->baseaddr + lpt_data, WrAddr + (wdata & 0x0F));
outb(sc->baseaddr + lpt_data, (wdata & 0x0F));
outb(sc->baseaddr + lpt_data, (wdata & 0x0F));
/* prepare and write high nibble */
wdata >>= 4;
outb(sc->baseaddr + lpt_data, wdata);
outb(sc->baseaddr + lpt_data, wdata + HNib);
outb(sc->baseaddr + lpt_data, wdata + HNib);
/* end-of-write */
outb(sc->baseaddr + lpt_data, EOC + wdata + HNib);
}
/*
* Write the byte to DRAM via lpt_data;
* used for remote DMA write in mode 0 / 2 / 4
*/
static __inline void
WrByteALToDRAM(struct rdp_softc *sc, u_char val)
{
outb(sc->baseaddr + lpt_data, val & 0x0F);
outb(sc->baseaddr + lpt_data, MkHi(val));
}
/*
* Write the byte to DRAM via lpt_control;
* used for remote DMA write in mode 1 / 3 / 5
*/
static __inline void
WrByteALToDRAMA(struct rdp_softc *sc, u_char val)
{
outb(sc->baseaddr + lpt_data, val & 0x0F);
outb(sc->baseaddr + lpt_control, Ctrl_LNibRead | sc->irqenbit);
outb(sc->baseaddr + lpt_data, val >> 4);
outb(sc->baseaddr + lpt_control, Ctrl_HNibRead | sc->irqenbit);
}
#if 0 /* they could be used for the RAM test */
/*
* Write the u_short to DRAM via lpt_data;
* used for remote DMA write in mode 0 / 2 / 4
*/
static __inline void
WrWordbxToDRAM(struct rdp_softc *sc, u_short val)
{
outb(sc->baseaddr + lpt_data, val & 0x0F);
val >>= 4;
outb(sc->baseaddr + lpt_data, (val & 0x0F) + HNib);
val >>= 4;
outb(sc->baseaddr + lpt_data, val & 0x0F);
val >>= 4;
outb(sc->baseaddr + lpt_data, val + HNib);
}
/*
* Write the u_short to DRAM via lpt_control;
* used for remote DMA write in mode 1 / 3 / 5
*/
static __inline void
WrWordbxToDRAMA(struct rdp_softc *sc, u_short val)
{
outb(sc->baseaddr + lpt_data, val & 0x0F);
outb(sc->baseaddr + lpt_control, Ctrl_LNibRead | sc->irqenbit);
val >>= 4;
outb(sc->baseaddr + lpt_data, (val & 0x0F) + HNib);
outb(sc->baseaddr + lpt_control, Ctrl_HNibRead | sc->irqenbit);
val >>= 4;
outb(sc->baseaddr + lpt_data, val & 0x0F);
outb(sc->baseaddr + lpt_control, Ctrl_LNibRead | sc->irqenbit);
val >>= 4;
outb(sc->baseaddr + lpt_data, val + HNib);
outb(sc->baseaddr + lpt_control, Ctrl_HNibRead | sc->irqenbit);
}
#endif
/*
* Determine if the device is present
*
* on entry:
* a pointer to an isa_device struct
* on exit:
* 0 if device not found
* or # of i/o addresses used (if found)
*/
static int
rdp_probe(struct isa_device *isa_dev)
{
int unit = isa_dev->id_unit;
struct rdp_softc *sc = &rdp_softc[unit];
u_char b1, b2;
intrmask_t irqmap[3];
u_char sval[3];
if (unit < 0 || unit >= NRDP)
return 0;
sc->baseaddr = isa_dev->id_iobase;
if (isa_dev->id_flags & 1)
sc->eeprom = EEPROM_74S288;
/* else defaults to 93C46 */
if (isa_dev->id_flags & 2)
sc->slow = 1;
/* let R/WB = A/DB = CSB = high to be ready for next r/w cycle */
outb(sc->baseaddr + lpt_data, 0xFF);
/* DIR = 0 for write mode, IRQEN=0, SLCT=INIT=AUTOFEED=STB=high */
outb(sc->baseaddr + lpt_control, Ctrl_SelData);
/* software reset */
WrNib(sc, CMR1 + HNib, MkHi(CMR1_RST));
DELAY(2000);
/* is EPLC alive? */
b1 = RdNib(sc, CMR1);
RdEnd(sc, CMR1);
b2 = RdNib(sc, CMR2) & 0x0f;
b2 |= RdNib(sc, CMR2 + HNib) << 4;
RdEnd(sc, CMR2 + HNib);
/*
* After the reset, we expect CMR1 & 7 to be 1 (rx buffer empty),
* and CMR2 & 0xf7 to be 0x20 (receive mode set to physical and
* broadcasts).
*/
if (bootverbose)
printf("rdp%d: CMR1 = %#x, CMR2 = %#x\n", unit, b1, b2);
if ((b1 & (CMR1_BUFE | CMR1_IRQ | CMR1_TRA)) != CMR1_BUFE
|| (b2 & ~CMR2_IRQINV) != CMR2_AM_PB)
return 0;
/*
* We have found something that could be a RTL 80[01]2, now
* see whether we can generate an interrupt.
*/
disable_intr();
/*
* Test whether our configured IRQ is working.
*
* Set to no acception mode + IRQout, then enable RxE + TxE,
* then cause RBER (by advancing the read pointer although
* the read buffer is empty) to generate an interrupt.
*/
WrByte(sc, CMR2, CMR2_IRQOUT);
WrNib(sc, CMR1 + HNib, MkHi(CMR1_TE | CMR1_RE));
WrNib(sc, CMR1, CMR1_RDPAC);
DELAY(1000);
irqmap[0] = isa_irq_pending();
sval[0] = inb(sc->baseaddr + lpt_status);
/* allow IRQs to pass the parallel interface */
outb(sc->baseaddr + lpt_control, Ctrl_IRQEN + Ctrl_SelData);
DELAY(1000);
/* generate interrupt */
WrNib(sc, IMR + HNib, MkHi(ISR_RBER));
DELAY(1000);
irqmap[1] = isa_irq_pending();
sval[1] = inb(sc->baseaddr + lpt_status);
/* de-assert and disable IRQ */
WrNib(sc, IMR + HNib, MkHi(0));
(void)inb(sc->baseaddr + lpt_status); /* might be necessary to
clear IRQ */
DELAY(1000);
irqmap[2] = isa_irq_pending();
sval[2] = inb(sc->baseaddr + lpt_status);
WrNib(sc, CMR1 + HNib, MkHi(0));
outb(sc->baseaddr + lpt_control, Ctrl_SelData);
WrNib(sc, CMR2, CMR2_IRQINV);
enable_intr();
if (bootverbose)
printf("rdp%d: irq maps / lpt status "
"%#x/%#x - %#x/%#x - %#x/%#x (id_irq %#x)\n",
unit, irqmap[0], sval[0], irqmap[1], sval[1],
irqmap[2], sval[2], isa_dev->id_irq);
if ((irqmap[1] & isa_dev->id_irq) == 0) {
printf("rdp%d: configured IRQ (%d) cannot be asserted "
"by device",
unit, ffs(isa_dev->id_irq) - 1);
if (irqmap[1])
printf(" (probable IRQ: %d)", ffs(irqmap[1]) - 1);
printf("\n");
return 0;
}
/*
* XXX should do RAMtest here
*/
switch (sc->eeprom) {
case EEPROM_93C46:
if (rdp_gethwaddr_93c46(sc, sc->arpcom.ac_enaddr) == 0) {
printf("rdp%d: failed to find a valid hardware "
"address in EEPROM\n",
unit);
return 0;
}
break;
case EEPROM_74S288:
rdp_gethwaddr_74s288(sc, sc->arpcom.ac_enaddr);
break;
}
return lpt_control + 1;
}
/*
* Install interface into kernel networking data structures
*/
static int
rdp_attach(struct isa_device *isa_dev)
{
int unit = isa_dev->id_unit;
struct rdp_softc *sc = &rdp_softc[unit];
struct ifnet *ifp = &sc->arpcom.ac_if;
isa_dev->id_ointr = rdpintr;
/*
* Reset interface
*/
rdp_stop(sc);
if (!ifp->if_name) {
/*
* Initialize ifnet structure
*/
ifp->if_softc = sc;
ifp->if_unit = unit;
ifp->if_name = "rdp";
ifp->if_start = rdp_start;
ifp->if_ioctl = rdp_ioctl;
ifp->if_watchdog = rdp_watchdog;
ifp->if_init = rdp_init;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX;
/*
* Attach the interface
*/
ether_ifattach(ifp, sc->arpcom.ac_enaddr);
}
/*
* Print additional info when attached
*/
if_printf(ifp, "RealTek RTL%s pocket ethernet, EEPROM %s, %s mode\n",
"8002", /* hook for 8012 */
sc->eeprom == EEPROM_93C46? "93C46": "74S288",
sc->slow? "slow": "fast");
if_printf(ifp, "address %6D\n", sc->arpcom.ac_enaddr, ":");
return 1;
}
/*
* Reset interface.
*/
static void
rdp_reset(struct ifnet *ifp)
{
struct rdp_softc *sc = ifp->if_softc;
int s;
s = splimp();
/*
* Stop interface and re-initialize.
*/
rdp_stop(sc);
rdp_init(sc);
(void) splx(s);
}
/*
* Take interface offline.
*/
static void
rdp_stop(struct rdp_softc *sc)
{
sc->txbusy = sc->txbusy = 0;
/* disable printer interface interrupts */
sc->irqenbit = 0;
outb(sc->baseaddr + lpt_control, Ctrl_SelData);
outb(sc->baseaddr + lpt_data, 0xff);
/* reset the RTL 8002 */
WrNib(sc, CMR1 + HNib, MkHi(CMR1_RST));
DELAY(100);
}
/*
* Device timeout/watchdog routine. Entered if the device neglects to
* generate an interrupt after a transmit has been started on it.
*/
static void
rdp_watchdog(struct ifnet *ifp)
{
log(LOG_ERR, "rdp%d: device timeout\n", ifp->if_unit);
ifp->if_oerrors++;
rdp_reset(ifp);
}
/*
* Initialize device.
*/
static void
rdp_init(void *xsc)
{
struct rdp_softc *sc = xsc;
struct ifnet *ifp = &sc->arpcom.ac_if;
int i, s;
u_char reg;
/* address not known */
if (TAILQ_EMPTY(&ifp->if_addrhead))
return;
s = splimp();
ifp->if_timer = 0;
/* program ethernet ID into the chip */
for (i = 0, reg = IDR0; i < 6; i++, reg++)
WrByte(sc, reg, sc->arpcom.ac_enaddr[i]);
/* set accept mode */
WrNib(sc, CMR2 + HNib,
MkHi((ifp->if_flags & IFF_PROMISC)? CMR2_AM_ALL: CMR2_AM_PB));
/* enable tx and rx */
WrNib(sc, CMR1 + HNib, MkHi(CMR1_TE | CMR1_RE));
/* allow interrupts to happen */
WrNib(sc, CMR2, CMR2_IRQOUT | CMR2_IRQINV);
WrNib(sc, IMR, ISR_TOK | ISR_TER | ISR_ROK | ISR_RER);
WrNib(sc, IMR + HNib, MkHi(ISR_RBER));
/* allow IRQs to pass the parallel interface */
sc->irqenbit = Ctrl_IRQEN;
outb(sc->baseaddr + lpt_control, sc->irqenbit + Ctrl_SelData);
/* clear all flags */
sc->txbusy = sc->txbuffered = 0;
/*
* Set 'running' flag, and clear output active flag.
*/
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
/*
* ...and attempt to start output
*/
rdp_start(ifp);
(void) splx(s);
}
/*
* Start output on interface.
* We make two assumptions here:
* 1) that the current priority is set to splimp _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
rdp_start(struct ifnet *ifp)
{
struct rdp_softc *sc = ifp->if_softc;
struct mbuf *m;
int len;
outloop:
/*
* See if there is room to put another packet in the buffer.
*/
if (sc->txbuffered) {
/*
* No room. Indicate this to the outside world and exit.
*/
ifp->if_flags |= IFF_OACTIVE;
return;
}
IF_DEQUEUE(&ifp->if_snd, m);
if (m == 0) {
/*
* 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 all the
* buffers with data then we still want to accept more.
*/
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
/*
* Copy the mbuf chain into the transmit buffer
*/
len = rdp_write_mbufs(sc, m);
if (len == 0)
goto outloop;
/* ensure minimal valid ethernet length */
len = max(len, (ETHER_MIN_LEN-ETHER_CRC_LEN));
/*
* Actually start the transceiver. Set a timeout in case the
* Tx interrupt never arrives.
*/
if (!sc->txbusy) {
WrNib(sc, TBCR1, len >> 8);
WrByte(sc, TBCR0, len & 0xff);
WrNib(sc, CMR1, CMR1_TRA);
sc->txbusy = 1;
ifp->if_timer = 2;
} else {
sc->txbuffered = 1;
sc->txsize = len;
}
/*
* Tap off here if there is a bpf listener.
*/
BPF_MTAP(ifp, m);
m_freem(m);
/*
* Loop back to the top to possibly buffer more packets
*/
goto outloop;
}
/*
* Process an ioctl request.
*/
static int
rdp_ioctl(struct ifnet *ifp, IOCTL_CMD_T command, caddr_t data)
{
struct rdp_softc *sc = ifp->if_softc;
int s, error = 0;
s = splimp();
switch (command) {
case SIOCSIFFLAGS:
/*
* If the interface is marked up and stopped, then start it.
* If it is marked down and running, then stop it.
*/
if (ifp->if_flags & IFF_UP) {
if ((ifp->if_flags & IFF_RUNNING) == 0)
rdp_init(sc);
} else {
if (ifp->if_flags & IFF_RUNNING) {
rdp_stop(sc);
ifp->if_flags &= ~IFF_RUNNING;
}
}
/*
* Promiscuous flag may have changed, propagage this
* to the NIC.
*/
if (ifp->if_flags & IFF_UP)
WrNib(sc, CMR2 + HNib,
MkHi((ifp->if_flags & IFF_PROMISC)?
CMR2_AM_ALL: CMR2_AM_PB));
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/*
* Multicast list has changed; we don't support it.
*/
error = ENOTTY;
break;
default:
error = ether_ioctl(ifp, command, data);
break;
}
(void) splx(s);
return (error);
}
/*
* External interrupt service routine.
*/
static void
rdpintr(int unit)
{
struct rdp_softc *sc = rdp_softc + unit;
struct ifnet *ifp = (struct ifnet *)sc;
u_char isr, tsr, rsr, colls;
/* disable interrupts, so SD3 can be routed to the pin */
sc->irqenbit = 0;
outb(sc->baseaddr + lpt_control, Ctrl_SelData);
WrNib(sc, CMR2, CMR2_IRQINV);
/*
* loop until there are no more new interrupts
*/
for (;;) {
isr = RdNib(sc, ISR);
isr |= RdNib(sc, ISR + HNib) << 4;
RdEnd(sc, ISR + HNib);
if (isr == 0)
break;
#if DEBUG & 4
printf("rdp%d: ISR = %#x\n", unit, isr);
#endif
/*
* Clear the pending interrupt bits.
*/
WrNib(sc, ISR, isr & 0x0f);
if (isr & 0xf0)
WrNib(sc, ISR + HNib, MkHi(isr));
/*
* Handle transmitter interrupts.
*/
if (isr & (ISR_TOK | ISR_TER)) {
tsr = RdNib(sc, TSR);
RdEnd(sc, TSR);
#if DEBUG & 4
if (isr & ISR_TER)
printf("rdp%d: tsr %#x\n", unit, tsr);
#endif
if (tsr & TSR_TABT)
ifp->if_oerrors++;
else
/*
* Update total number of successfully
* transmitted packets.
*/
ifp->if_opackets++;
if (tsr & TSR_COL) {
colls = RdNib(sc, COLR);
RdEnd(sc, COLR);
ifp->if_collisions += colls;
}
/*
* reset tx busy and output active flags
*/
sc->txbusy = 0;
ifp->if_flags &= ~IFF_OACTIVE;
/*
* If we had already queued up another packet,
* start sending it now.
*/
if (sc->txbuffered) {
WrNib(sc, TBCR1, sc->txsize >> 8);
WrByte(sc, TBCR0, sc->txsize & 0xff);
WrNib(sc, CMR1, CMR1_TRA);
sc->txbusy = 1;
sc->txbuffered = 0;
ifp->if_timer = 2;
} else {
/*
* clear watchdog timer
*/
ifp->if_timer = 0;
}
}
/*
* Handle receiver interrupts
*/
if (isr & (ISR_ROK | ISR_RER | ISR_RBER)) {
rsr = RdNib(sc, RSR);
rsr |= RdNib(sc, RSR + HNib) << 4;
RdEnd(sc, RSR + HNib);
#if DEBUG & 4
if (isr & (ISR_RER | ISR_RBER))
printf("rdp%d: rsr %#x\n", unit, rsr);
#endif
if (rsr & (RSR_PUN | RSR_POV)) {
printf("rdp%d: rsr %#x, resetting\n",
unit, rsr);
rdp_reset(ifp);
break;
}
if (rsr & RSR_BUFO)
/*
* CRC and FA errors are recorded in
* rdp_rint() on a per-packet basis
*/
ifp->if_ierrors++;
if (isr & (ISR_ROK | ISR_RER))
rdp_rint(sc);
}
/*
* If it looks like the transmitter can take more data,
* attempt to start output on the interface. This is done
* after handling the receiver to give the receiver priority.
*/
if ((ifp->if_flags & IFF_OACTIVE) == 0)
rdp_start(ifp);
}
/* re-enable interrupts */
WrNib(sc, CMR2, CMR2_IRQOUT | CMR2_IRQINV);
sc->irqenbit = Ctrl_IRQEN;
outb(sc->baseaddr + lpt_control, Ctrl_SelData + sc->irqenbit);
}
/*
* Ethernet interface receiver interrupt.
*/
static void
rdp_rint(struct rdp_softc *sc)
{
struct ifnet *ifp = &sc->arpcom.ac_if;
struct rdphdr rh;
u_short len;
size_t i;
u_char *packet_ptr, b, status;
int excessive_bad_pkts = 0;
/*
* Fetch the packets from the NIC's buffer.
*/
for (;;) {
b = RdNib(sc, CMR1);
RdEnd(sc, CMR1);
if (b & CMR1_BUFE)
/* no more packets */
break;
/* first, obtain the buffer header */
outb(sc->baseaddr + lpt_data, MAR + EOC); /* prepare addr */
outb(sc->baseaddr + lpt_control, Ctrl_LNibRead);
outb(sc->baseaddr + lpt_data, MAR + RdAddr + HNib);
packet_ptr = (u_char *)&rh;
if (sc->slow)
for (i = 0; i < sizeof rh; i++, packet_ptr++)
*packet_ptr = RdByteA2(sc);
else
for (i = 0; i < sizeof rh; i++, packet_ptr++)
*packet_ptr = RdByteA1(sc);
RdEnd(sc, MAR + HNib);
outb(sc->baseaddr + lpt_control, Ctrl_SelData);
len = rh.pktlen - ETHER_CRC_LEN;
status = rh.status;
if ((status & (RSR_ROK | RSR_CRC | RSR_FA)) != RSR_ROK ||
len > (ETHER_MAX_LEN - ETHER_CRC_LEN) ||
len < (ETHER_MIN_LEN - ETHER_CRC_LEN) ||
len > MCLBYTES) {
#if DEBUG
if_printf(ifp, "bad packet in buffer, "
"len %d, status %#x\n",
(int)len, (int)status);
#endif
ifp->if_ierrors++;
/* rx jump packet */
WrNib(sc, CMR1, CMR1_RDPAC);
if (++excessive_bad_pkts > 5) {
/*
* the chip seems to be stuck, we are
* probably seeing the same bad packet
* over and over again
*/
#if DEBUG
if_printf(ifp, "resetting due to an "
"excessive number of bad packets\n");
#endif
rdp_reset(ifp);
return;
}
continue;
}
/*
* Go get packet.
*/
excessive_bad_pkts = 0;
rdp_get_packet(sc, len);
ifp->if_ipackets++;
}
}
/*
* Retreive packet from NIC memory and send to the next level up via
* ether_input().
*/
static void
rdp_get_packet(struct rdp_softc *sc, unsigned len)
{
struct ifnet *ifp = &sc->arpcom.ac_if;
struct mbuf *m;
u_char *packet_ptr;
size_t s;
/* Allocate a header mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = len;
/*
* We always put the received packet in a single buffer -
* either with just an mbuf header or in a cluster attached
* to the header. The +2 is to compensate for the alignment
* fixup below.
*/
if ((len + ETHER_ALIGN) > MHLEN) {
/* Attach an mbuf cluster */
MCLGET(m, M_DONTWAIT);
/* Insist on getting a cluster */
if ((m->m_flags & M_EXT) == 0) {
m_freem(m);
return;
}
}
/*
* The +2 is to longword align the start of the real packet.
* This is important for NFS.
*/
m->m_data += ETHER_ALIGN;
/*
* Get packet, including link layer address, from interface.
*/
outb(sc->baseaddr + lpt_control, Ctrl_LNibRead);
outb(sc->baseaddr + lpt_data, RdAddr + MAR);
packet_ptr = mtod(m, u_char *);
if (sc->slow)
for (s = 0; s < len; s++, packet_ptr++)
*packet_ptr = RdByteA2(sc);
else
for (s = 0; s < len; s++, packet_ptr++)
*packet_ptr = RdByteA1(sc);
RdEnd(sc, MAR + HNib);
outb(sc->baseaddr + lpt_control, Ctrl_SelData);
WrNib(sc, CMR1, CMR1_RDPAC);
(*ifp->if_input)(ifp, m);
}
/*
* Write an mbuf chain to the NIC's tx buffer.
*/
static u_short
rdp_write_mbufs(struct rdp_softc *sc, struct mbuf *m)
{
u_short total_len;
struct mbuf *mp;
u_char *dp, b;
int i;
/* First, count up the total number of bytes to copy */
for (total_len = 0, mp = m; mp; mp = mp->m_next)
total_len += mp->m_len;
if (total_len == 0)
return 0;
outb(sc->baseaddr + lpt_data, MAR | EOC);
/*
* Transfer the mbuf chain to the NIC memory.
*/
if (sc->slow) {
/* writing the first byte is complicated */
outb(sc->baseaddr + lpt_control,
Ctrl_LNibRead | sc->irqenbit);
outb(sc->baseaddr + lpt_data, MAR | WrAddr);
b = *(u_char *)m->m_data;
outb(sc->baseaddr + lpt_data, (b & 0x0f) | 0x40);
outb(sc->baseaddr + lpt_data, b & 0x0f);
outb(sc->baseaddr + lpt_data, b >> 4);
outb(sc->baseaddr + lpt_control,
Ctrl_HNibRead | sc->irqenbit);
/* advance the mbuf pointer */
mp = m;
m->m_len--;
m->m_data++;
/* write the remaining bytes */
while (m) {
for (i = 0, dp = (u_char *)m->m_data;
i < m->m_len;
i++, dp++)
WrByteALToDRAMA(sc, *dp);
m = m->m_next;
}
/*
* restore old mbuf in case we have to hand it off to
* BPF again
*/
m = mp;
m->m_len++;
m->m_data--;
/* the RTL 8002 requires an even byte-count remote DMA */
if (total_len & 1)
WrByteALToDRAMA(sc, 0);
} else {
outb(sc->baseaddr + lpt_data, MAR | WrAddr);
while (m) {
for (i = 0, dp = (u_char *)m->m_data;
i < m->m_len;
i++, dp++)
WrByteALToDRAM(sc, *dp);
m = m->m_next;
}
/* the RTL 8002 requires an even byte-count remote DMA */
if (total_len & 1)
WrByteALToDRAM(sc, 0);
}
outb(sc->baseaddr + lpt_data, 0xff);
outb(sc->baseaddr + lpt_control,
Ctrl_HNibRead | Ctrl_SelData | sc->irqenbit);
return total_len;
}
/*
* Read the designated ethernet hardware address out of a 93C46
* (serial) EEPROM.
* Note that the 93C46 uses 16-bit words in big-endian notation.
*/
static int
rdp_gethwaddr_93c46(struct rdp_softc *sc, u_char *etheraddr)
{
int i, magic;
size_t j = 0;
u_short w;
WrNib(sc, CMR2, CMR2_PAGE | CMR2_IRQINV); /* select page 1 */
/*
* The original RealTek packet driver had the ethernet address
* starting at EEPROM address 0. Other vendors seem to have
* gone `creative' here -- while they didn't do anything else
* than changing a few strings in the entire driver, compared
* to the RealTek version, they also moved out the ethernet
* address to a different location in the EEPROM, so the
* original RealTek driver won't work correctly with them, and
* vice versa. Sounds pretty cool, eh? $@%&!
*
* Anyway, we walk through the EEPROM, until we find some
* allowable value based upon our table of IEEE OUI assignments.
*/
for (i = magic = 0; magic < 3 && i < 32; i++) {
/* read cmd (+ 6 bit address) */
rdp_93c46_cmd(sc, 0x180 + i, 10);
w = rdp_93c46_read(sc);
switch (magic) {
case 0:
for (j = 0;
j < sizeof allowed_ouis / sizeof(u_short);
j++)
if (w == allowed_ouis[j]) {
etheraddr[0] = (w >> 8) & 0xff;
etheraddr[1] = w & 0xff;
magic++;
break;
}
break;
case 1:
/*
* If the first two bytes have been 00:00, we
* discard the match iff the next two bytes
* are also 00:00, so we won't get fooled by
* an EEPROM that has been filled with zeros.
* This in theory would disallow 64 K of legal
* addresses assigned to Xerox, but it's
* almost certain that those addresses haven't
* been used for RTL80[01]2 chips anyway.
*/
if ((etheraddr[0] | etheraddr[1]) == 0 && w == 0) {
magic--;
break;
}
etheraddr[2] = (w >> 8) & 0xff;
etheraddr[3] = w & 0xff;
magic++;
break;
case 2:
etheraddr[4] = (w >> 8) & 0xff;
etheraddr[5] = w & 0xff;
magic++;
break;
}
}
WrNib(sc, CMR2, CMR2_IRQINV); /* back to page 0 */
return magic == 3;
}
/*
* Read the designated ethernet hardware address out of a 74S288
* EEPROM.
*
* This is untested, since i haven't seen any adapter actually using
* a 74S288. In the RTL 8012, only the serial EEPROM (94C46) is
* supported anymore.
*/
static void
rdp_gethwaddr_74s288(struct rdp_softc *sc, u_char *etheraddr)
{
int i;
u_char b;
WrNib(sc, CMR2, CMR2_PAGE | CMR2_IRQINV); /* select page 1 */
for (i = 0; i < 6; i++) {
WrNib(sc, PCMR, i & 0x0f); /* lower 4 bit of addr */
WrNib(sc, PCMR + HNib, HNib + 4); /* upper 2 bit addr + /CS */
WrNib(sc, PCMR + HNib, HNib); /* latch data now */
b = RdNib(sc, PDR) & 0x0f;
b |= (RdNib(sc, PDR + HNib) & 0x0f) << 4;
etheraddr[i] = b;
}
RdEnd(sc, PDR + HNib);
WrNib(sc, CMR2, CMR2_IRQINV); /* reselect page 0 */
}
/*
* Send nbits of data (starting with MSB) out to the 93c46 as a
* command. Assumes register page 1 has already been selected.
*/
static void
rdp_93c46_cmd(struct rdp_softc *sc, u_short data, unsigned nbits)
{
u_short mask = 1 << (nbits - 1);
unsigned i;
u_char b;
#if DEBUG & 2
printf("rdp_93c46_cmd(): ");
#endif
for (i = 0; i < nbits; i++, mask >>= 1) {
b = HNib + PCMR_SK + PCMR_CS;
if (data & mask)
b += PCMR_DO;
#if DEBUG & 2
printf("%d", b & 1);
#endif
WrNib(sc, PCMR + HNib, b);
DELAY(1);
WrNib(sc, PCMR + HNib, b & ~PCMR_SK);
DELAY(1);
}
#if DEBUG & 2
printf("\n");
#endif
}
/*
* Read one word of data from the 93c46. Actually, we have to read
* 17 bits, and discard the very first bit. Assumes register page 1
* to be selected as well.
*/
static u_short
rdp_93c46_read(struct rdp_softc *sc)
{
u_short data = 0;
u_char b;
int i;
#if DEBUG & 2
printf("rdp_93c46_read(): ");
#endif
for (i = 0; i < 17; i++) {
WrNib(sc, PCMR + HNib, PCMR_SK + PCMR_CS + HNib);
DELAY(1);
WrNib(sc, PCMR + HNib, PCMR_CS + HNib);
DELAY(1);
b = RdNib(sc, PDR);
data <<= 1;
if (b & 1)
data |= 1;
#if DEBUG & 2
printf("%d", b & 1);
#endif
RdEnd(sc, PDR);
DELAY(1);
}
#if DEBUG & 2
printf("\n");
#endif
/* end of cycle */
WrNib(sc, PCMR + HNib, PCMR_SK + HNib);
DELAY(1);
return data;
}
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