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freebsd-skq/sys/dev/sn/if_sn.c
Pedro F. Giffuni 718cf2ccb9 sys/dev: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 14:52:40 +00:00

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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (c) 1996 Gardner Buchanan <gbuchanan@shl.com>
* 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, 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gardner Buchanan.
* 4. The name of Gardner Buchanan may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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("$FreeBSD$");
/*
* This is a driver for SMC's 9000 series of Ethernet adapters.
*
* This FreeBSD driver is derived from the smc9194 Linux driver by
* Erik Stahlman and is Copyright (C) 1996 by Erik Stahlman.
* This driver also shamelessly borrows from the FreeBSD ep driver
* which is Copyright (C) 1994 Herb Peyerl <hpeyerl@novatel.ca>
* All rights reserved.
*
* It is set up for my SMC91C92 equipped Ampro LittleBoard embedded
* PC. It is adapted from Erik Stahlman's Linux driver which worked
* with his EFA Info*Express SVC VLB adaptor. According to SMC's databook,
* it will work for the entire SMC 9xxx series. (Ha Ha)
*
* "Features" of the SMC chip:
* 4608 byte packet memory. (for the 91C92. Others have more)
* EEPROM for configuration
* AUI/TP selection
*
* Authors:
* Erik Stahlman erik@vt.edu
* Herb Peyerl hpeyerl@novatel.ca
* Andres Vega Garcia avega@sophia.inria.fr
* Serge Babkin babkin@hq.icb.chel.su
* Gardner Buchanan gbuchanan@shl.com
*
* Sources:
* o SMC databook
* o "smc9194.c:v0.10(FIXED) 02/15/96 by Erik Stahlman (erik@vt.edu)"
* o "if_ep.c,v 1.19 1995/01/24 20:53:45 davidg Exp"
*
* Known Bugs:
* o Setting of the hardware address isn't supported.
* o Hardware padding isn't used.
*/
/*
* Modifications for Megahertz X-Jack Ethernet Card (XJ-10BT)
*
* Copyright (c) 1996 by Tatsumi Hosokawa <hosokawa@jp.FreeBSD.org>
* BSD-nomads, Tokyo, Japan.
*/
/*
* Multicast support by Kei TANAKA <kei@pal.xerox.com>
* Special thanks to itojun@itojun.org
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_mib.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#include <net/bpf.h>
#include <net/bpfdesc.h>
#include <dev/sn/if_snreg.h>
#include <dev/sn/if_snvar.h>
/* Exported variables */
devclass_t sn_devclass;
static int snioctl(struct ifnet * ifp, u_long, caddr_t);
static void snresume(struct ifnet *);
static void snintr_locked(struct sn_softc *);
static void sninit_locked(void *);
static void snstart_locked(struct ifnet *);
static void sninit(void *);
static void snread(struct ifnet *);
static void snstart(struct ifnet *);
static void snstop(struct sn_softc *);
static void snwatchdog(void *);
static void sn_setmcast(struct sn_softc *);
static int sn_getmcf(struct ifnet *ifp, u_char *mcf);
/* I (GB) have been unlucky getting the hardware padding
* to work properly.
*/
#define SW_PAD
static const char *chip_ids[15] = {
NULL, NULL, NULL,
/* 3 */ "SMC91C90/91C92",
/* 4 */ "SMC91C94/91C96",
/* 5 */ "SMC91C95",
NULL,
/* 7 */ "SMC91C100",
/* 8 */ "SMC91C100FD",
/* 9 */ "SMC91C110",
NULL, NULL,
NULL, NULL, NULL
};
int
sn_attach(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
struct ifnet *ifp;
uint16_t i;
uint8_t *p;
int rev;
uint16_t address;
int err;
u_char eaddr[6];
ifp = sc->ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
device_printf(dev, "can not if_alloc()\n");
return (ENOSPC);
}
SN_LOCK_INIT(sc);
callout_init_mtx(&sc->watchdog, &sc->sc_mtx, 0);
snstop(sc);
sc->pages_wanted = -1;
if (bootverbose || 1) {
SMC_SELECT_BANK(sc, 3);
rev = (CSR_READ_2(sc, REVISION_REG_W) >> 4) & 0xf;
if (chip_ids[rev])
device_printf(dev, " %s ", chip_ids[rev]);
else
device_printf(dev, " unsupported chip: rev %d ", rev);
SMC_SELECT_BANK(sc, 1);
i = CSR_READ_2(sc, CONFIG_REG_W);
printf("%s\n", i & CR_AUI_SELECT ? "AUI" : "UTP");
}
/*
* Read the station address from the chip. The MAC address is bank 1,
* regs 4 - 9
*/
SMC_SELECT_BANK(sc, 1);
p = (uint8_t *) eaddr;
for (i = 0; i < 6; i += 2) {
address = CSR_READ_2(sc, IAR_ADDR0_REG_W + i);
p[i + 1] = address >> 8;
p[i] = address & 0xFF;
}
ifp->if_softc = sc;
if_initname(ifp, device_get_name(dev), device_get_unit(dev));
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_start = snstart;
ifp->if_ioctl = snioctl;
ifp->if_init = sninit;
ifp->if_baudrate = 10000000;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
ifp->if_snd.ifq_maxlen = ifqmaxlen;
IFQ_SET_READY(&ifp->if_snd);
ether_ifattach(ifp, eaddr);
/*
* Activate the interrupt so we can get card interrupts. This
* needs to be done last so that we don't have/hold the lock
* during startup to avoid LORs in the network layer.
*/
if ((err = bus_setup_intr(dev, sc->irq_res,
INTR_TYPE_NET | INTR_MPSAFE, NULL, sn_intr, sc,
&sc->intrhand)) != 0) {
sn_detach(dev);
return err;
}
return 0;
}
int
sn_detach(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
struct ifnet *ifp = sc->ifp;
ether_ifdetach(ifp);
SN_LOCK(sc);
snstop(sc);
SN_UNLOCK(sc);
callout_drain(&sc->watchdog);
sn_deactivate(dev);
if_free(ifp);
SN_LOCK_DESTROY(sc);
return 0;
}
static void
sninit(void *xsc)
{
struct sn_softc *sc = xsc;
SN_LOCK(sc);
sninit_locked(sc);
SN_UNLOCK(sc);
}
/*
* Reset and initialize the chip
*/
static void
sninit_locked(void *xsc)
{
struct sn_softc *sc = xsc;
struct ifnet *ifp = sc->ifp;
int flags;
int mask;
SN_ASSERT_LOCKED(sc);
/*
* This resets the registers mostly to defaults, but doesn't affect
* EEPROM. After the reset cycle, we pause briefly for the chip to
* be happy.
*/
SMC_SELECT_BANK(sc, 0);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, RCR_SOFTRESET);
SMC_DELAY(sc);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, 0x0000);
SMC_DELAY(sc);
SMC_DELAY(sc);
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, 0x0000);
/*
* Set the control register to automatically release successfully
* transmitted packets (making the best use out of our limited
* memory) and to enable the EPH interrupt on certain TX errors.
*/
SMC_SELECT_BANK(sc, 1);
CSR_WRITE_2(sc, CONTROL_REG_W, (CTR_AUTO_RELEASE | CTR_TE_ENABLE |
CTR_CR_ENABLE | CTR_LE_ENABLE));
/* Set squelch level to 240mV (default 480mV) */
flags = CSR_READ_2(sc, CONFIG_REG_W);
flags |= CR_SET_SQLCH;
CSR_WRITE_2(sc, CONFIG_REG_W, flags);
/*
* Reset the MMU and wait for it to be un-busy.
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_RESET);
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
/*
* Disable all interrupts
*/
CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00);
sn_setmcast(sc);
/*
* Set the transmitter control. We want it enabled.
*/
flags = TCR_ENABLE;
#ifndef SW_PAD
/*
* I (GB) have been unlucky getting this to work.
*/
flags |= TCR_PAD_ENABLE;
#endif /* SW_PAD */
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, flags);
/*
* Now, enable interrupts
*/
SMC_SELECT_BANK(sc, 2);
mask = IM_EPH_INT |
IM_RX_OVRN_INT |
IM_RCV_INT |
IM_TX_INT;
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
sc->pages_wanted = -1;
/*
* Mark the interface running but not active.
*/
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
callout_reset(&sc->watchdog, hz, snwatchdog, sc);
/*
* Attempt to push out any waiting packets.
*/
snstart_locked(ifp);
}
static void
snstart(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
SN_LOCK(sc);
snstart_locked(ifp);
SN_UNLOCK(sc);
}
static void
snstart_locked(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
u_int len;
struct mbuf *m;
struct mbuf *top;
int pad;
int mask;
uint16_t length;
uint16_t numPages;
uint8_t packet_no;
int time_out;
int junk = 0;
SN_ASSERT_LOCKED(sc);
if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
return;
if (sc->pages_wanted != -1) {
if_printf(ifp, "snstart() while memory allocation pending\n");
return;
}
startagain:
/*
* Sneak a peek at the next packet
*/
m = ifp->if_snd.ifq_head;
if (m == NULL)
return;
/*
* Compute the frame length and set pad to give an overall even
* number of bytes. Below we assume that the packet length is even.
*/
for (len = 0, top = m; m; m = m->m_next)
len += m->m_len;
pad = (len & 1);
/*
* We drop packets that are too large. Perhaps we should truncate
* them instead?
*/
if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) {
if_printf(ifp, "large packet discarded (A)\n");
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
m_freem(m);
goto readcheck;
}
#ifdef SW_PAD
/*
* If HW padding is not turned on, then pad to ETHER_MIN_LEN.
*/
if (len < ETHER_MIN_LEN - ETHER_CRC_LEN)
pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len;
#endif /* SW_PAD */
length = pad + len;
/*
* The MMU wants the number of pages to be the number of 256 byte
* 'pages', minus 1 (A packet can't ever have 0 pages. We also
* include space for the status word, byte count and control bytes in
* the allocation request.
*/
numPages = (length + 6) >> 8;
/*
* Now, try to allocate the memory
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ALLOC | numPages);
/*
* Wait a short amount of time to see if the allocation request
* completes. Otherwise, I enable the interrupt and wait for
* completion asynchronously.
*/
time_out = MEMORY_WAIT_TIME;
do {
if (CSR_READ_1(sc, INTR_STAT_REG_B) & IM_ALLOC_INT)
break;
} while (--time_out);
if (!time_out || junk > 10) {
/*
* No memory now. Oh well, wait until the chip finds memory
* later. Remember how many pages we were asking for and
* enable the allocation completion interrupt. Also set a
* watchdog in case we miss the interrupt. We mark the
* interface active since there is no point in attempting an
* snstart() until after the memory is available.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B) | IM_ALLOC_INT;
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
sc->timer = 1;
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
sc->pages_wanted = numPages;
return;
}
/*
* The memory allocation completed. Check the results.
*/
packet_no = CSR_READ_1(sc, ALLOC_RESULT_REG_B);
if (packet_no & ARR_FAILED) {
if (junk++ > 10)
if_printf(ifp, "Memory allocation failed\n");
goto startagain;
}
/*
* We have a packet number, so tell the card to use it.
*/
CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no);
/*
* Point to the beginning of the packet
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | 0x0000);
/*
* Send the packet length (+6 for status, length and control byte)
* and the status word (set to zeros)
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) & 0xFF);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) >> 8);
/*
* Get the packet from the kernel. This will include the Ethernet
* frame header, MAC Addresses etc.
*/
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
/*
* Push out the data to the card.
*/
for (top = m; m != NULL; m = m->m_next) {
/*
* Push out words.
*/
CSR_WRITE_MULTI_2(sc, DATA_REG_W, mtod(m, uint16_t *),
m->m_len / 2);
/*
* Push out remaining byte.
*/
if (m->m_len & 1)
CSR_WRITE_1(sc, DATA_REG_B,
*(mtod(m, caddr_t) + m->m_len - 1));
}
/*
* Push out padding.
*/
while (pad > 1) {
CSR_WRITE_2(sc, DATA_REG_W, 0);
pad -= 2;
}
if (pad)
CSR_WRITE_1(sc, DATA_REG_B, 0);
/*
* Push out control byte and unused packet byte The control byte is 0
* meaning the packet is even lengthed and no special CRC handling is
* desired.
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
/*
* Enable the interrupts and let the chipset deal with it Also set a
* watchdog in case we miss the interrupt.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT);
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ENQUEUE);
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
sc->timer = 1;
BPF_MTAP(ifp, top);
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
m_freem(top);
readcheck:
/*
* Is another packet coming in? We don't want to overflow the tiny
* RX FIFO. If nothing has arrived then attempt to queue another
* transmit packet.
*/
if (CSR_READ_2(sc, FIFO_PORTS_REG_W) & FIFO_REMPTY)
goto startagain;
return;
}
/* Resume a packet transmit operation after a memory allocation
* has completed.
*
* This is basically a hacked up copy of snstart() which handles
* a completed memory allocation the same way snstart() does.
* It then passes control to snstart to handle any other queued
* packets.
*/
static void
snresume(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
u_int len;
struct mbuf *m;
struct mbuf *top;
int pad;
int mask;
uint16_t length;
uint16_t numPages;
uint16_t pages_wanted;
uint8_t packet_no;
if (sc->pages_wanted < 0)
return;
pages_wanted = sc->pages_wanted;
sc->pages_wanted = -1;
/*
* Sneak a peek at the next packet
*/
m = ifp->if_snd.ifq_head;
if (m == NULL) {
if_printf(ifp, "snresume() with nothing to send\n");
return;
}
/*
* Compute the frame length and set pad to give an overall even
* number of bytes. Below we assume that the packet length is even.
*/
for (len = 0, top = m; m; m = m->m_next)
len += m->m_len;
pad = (len & 1);
/*
* We drop packets that are too large. Perhaps we should truncate
* them instead?
*/
if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) {
if_printf(ifp, "large packet discarded (B)\n");
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
m_freem(m);
return;
}
#ifdef SW_PAD
/*
* If HW padding is not turned on, then pad to ETHER_MIN_LEN.
*/
if (len < ETHER_MIN_LEN - ETHER_CRC_LEN)
pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len;
#endif /* SW_PAD */
length = pad + len;
/*
* The MMU wants the number of pages to be the number of 256 byte
* 'pages', minus 1 (A packet can't ever have 0 pages. We also
* include space for the status word, byte count and control bytes in
* the allocation request.
*/
numPages = (length + 6) >> 8;
SMC_SELECT_BANK(sc, 2);
/*
* The memory allocation completed. Check the results. If it failed,
* we simply set a watchdog timer and hope for the best.
*/
packet_no = CSR_READ_1(sc, ALLOC_RESULT_REG_B);
if (packet_no & ARR_FAILED) {
if_printf(ifp, "Memory allocation failed. Weird.\n");
sc->timer = 1;
goto try_start;
}
/*
* We have a packet number, so tell the card to use it.
*/
CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no);
/*
* Now, numPages should match the pages_wanted recorded when the
* memory allocation was initiated.
*/
if (pages_wanted != numPages) {
if_printf(ifp, "memory allocation wrong size. Weird.\n");
/*
* If the allocation was the wrong size we simply release the
* memory once it is granted. Wait for the MMU to be un-busy.
*/
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_FREEPKT);
return;
}
/*
* Point to the beginning of the packet
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | 0x0000);
/*
* Send the packet length (+6 for status, length and control byte)
* and the status word (set to zeros)
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) & 0xFF);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) >> 8);
/*
* Get the packet from the kernel. This will include the Ethernet
* frame header, MAC Addresses etc.
*/
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
/*
* Push out the data to the card.
*/
for (top = m; m != NULL; m = m->m_next) {
/*
* Push out words.
*/
CSR_WRITE_MULTI_2(sc, DATA_REG_W, mtod(m, uint16_t *),
m->m_len / 2);
/*
* Push out remaining byte.
*/
if (m->m_len & 1)
CSR_WRITE_1(sc, DATA_REG_B,
*(mtod(m, caddr_t) + m->m_len - 1));
}
/*
* Push out padding.
*/
while (pad > 1) {
CSR_WRITE_2(sc, DATA_REG_W, 0);
pad -= 2;
}
if (pad)
CSR_WRITE_1(sc, DATA_REG_B, 0);
/*
* Push out control byte and unused packet byte The control byte is 0
* meaning the packet is even lengthed and no special CRC handling is
* desired.
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
/*
* Enable the interrupts and let the chipset deal with it Also set a
* watchdog in case we miss the interrupt.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT);
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ENQUEUE);
BPF_MTAP(ifp, top);
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
m_freem(top);
try_start:
/*
* Now pass control to snstart() to queue any additional packets
*/
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snstart_locked(ifp);
/*
* We've sent something, so we're active. Set a watchdog in case the
* TX_EMPTY interrupt is lost.
*/
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
sc->timer = 1;
return;
}
void
sn_intr(void *arg)
{
struct sn_softc *sc = (struct sn_softc *) arg;
SN_LOCK(sc);
snintr_locked(sc);
SN_UNLOCK(sc);
}
static void
snintr_locked(struct sn_softc *sc)
{
int status, interrupts;
struct ifnet *ifp = sc->ifp;
/*
* Chip state registers
*/
uint8_t mask;
uint8_t packet_no;
uint16_t tx_status;
uint16_t card_stats;
/*
* Clear the watchdog.
*/
sc->timer = 0;
SMC_SELECT_BANK(sc, 2);
/*
* Obtain the current interrupt mask and clear the hardware mask
* while servicing interrupts.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B);
CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00);
/*
* Get the set of interrupts which occurred and eliminate any which
* are masked.
*/
interrupts = CSR_READ_1(sc, INTR_STAT_REG_B);
status = interrupts & mask;
/*
* Now, process each of the interrupt types.
*/
/*
* Receive Overrun.
*/
if (status & IM_RX_OVRN_INT) {
/*
* Acknowlege Interrupt
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_RX_OVRN_INT);
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
}
/*
* Got a packet.
*/
if (status & IM_RCV_INT) {
int packet_number;
SMC_SELECT_BANK(sc, 2);
packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W);
if (packet_number & FIFO_REMPTY) {
/*
* we got called , but nothing was on the FIFO
*/
printf("sn: Receive interrupt with nothing on FIFO\n");
goto out;
}
snread(ifp);
}
/*
* An on-card memory allocation came through.
*/
if (status & IM_ALLOC_INT) {
/*
* Disable this interrupt.
*/
mask &= ~IM_ALLOC_INT;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snresume(ifp);
}
/*
* TX Completion. Handle a transmit error message. This will only be
* called when there is an error, because of the AUTO_RELEASE mode.
*/
if (status & IM_TX_INT) {
/*
* Acknowlege Interrupt
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_TX_INT);
packet_no = CSR_READ_2(sc, FIFO_PORTS_REG_W);
packet_no &= FIFO_TX_MASK;
/*
* select this as the packet to read from
*/
CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no);
/*
* Position the pointer to the first word from this packet
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | PTR_READ | 0x0000);
/*
* Fetch the TX status word. The value found here will be a
* copy of the EPH_STATUS_REG_W at the time the transmit
* failed.
*/
tx_status = CSR_READ_2(sc, DATA_REG_W);
if (tx_status & EPHSR_TX_SUC) {
device_printf(sc->dev,
"Successful packet caused interrupt\n");
} else {
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
}
if (tx_status & EPHSR_LATCOL)
if_inc_counter(ifp, IFCOUNTER_COLLISIONS, 1);
/*
* Some of these errors will have disabled transmit.
* Re-enable transmit now.
*/
SMC_SELECT_BANK(sc, 0);
#ifdef SW_PAD
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, TCR_ENABLE);
#else
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, TCR_ENABLE | TCR_PAD_ENABLE);
#endif /* SW_PAD */
/*
* kill the failed packet. Wait for the MMU to be un-busy.
*/
SMC_SELECT_BANK(sc, 2);
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_FREEPKT);
/*
* Attempt to queue more transmits.
*/
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snstart_locked(ifp);
}
/*
* Transmit underrun. We use this opportunity to update transmit
* statistics from the card.
*/
if (status & IM_TX_EMPTY_INT) {
/*
* Acknowlege Interrupt
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_TX_EMPTY_INT);
/*
* Disable this interrupt.
*/
mask &= ~IM_TX_EMPTY_INT;
SMC_SELECT_BANK(sc, 0);
card_stats = CSR_READ_2(sc, COUNTER_REG_W);
/*
* Single collisions
*/
if_inc_counter(ifp, IFCOUNTER_COLLISIONS, card_stats & ECR_COLN_MASK);
/*
* Multiple collisions
*/
if_inc_counter(ifp, IFCOUNTER_COLLISIONS, (card_stats & ECR_MCOLN_MASK) >> 4);
SMC_SELECT_BANK(sc, 2);
/*
* Attempt to enqueue some more stuff.
*/
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snstart_locked(ifp);
}
/*
* Some other error. Try to fix it by resetting the adapter.
*/
if (status & IM_EPH_INT) {
snstop(sc);
sninit_locked(sc);
}
out:
/*
* Handled all interrupt sources.
*/
SMC_SELECT_BANK(sc, 2);
/*
* Reestablish interrupts from mask which have not been deselected
* during this interrupt. Note that the hardware mask, which was set
* to 0x00 at the start of this service routine, may have been
* updated by one or more of the interrupt handers and we must let
* those new interrupts stay enabled here.
*/
mask |= CSR_READ_1(sc, INTR_MASK_REG_B);
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
}
static void
snread(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
struct ether_header *eh;
struct mbuf *m;
short status;
int packet_number;
uint16_t packet_length;
uint8_t *data;
SMC_SELECT_BANK(sc, 2);
#if 0
packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W);
if (packet_number & FIFO_REMPTY) {
/*
* we got called , but nothing was on the FIFO
*/
printf("sn: Receive interrupt with nothing on FIFO\n");
return;
}
#endif
read_another:
/*
* Start reading from the start of the packet. Since PTR_RCV is set,
* packet number is found in FIFO_PORTS_REG_W, FIFO_RX_MASK.
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_READ | PTR_RCV | PTR_AUTOINC | 0x0000);
/*
* First two words are status and packet_length
*/
status = CSR_READ_2(sc, DATA_REG_W);
packet_length = CSR_READ_2(sc, DATA_REG_W) & RLEN_MASK;
/*
* The packet length contains 3 extra words: status, length, and a
* extra word with the control byte.
*/
packet_length -= 6;
/*
* Account for receive errors and discard.
*/
if (status & RS_ERRORS) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
goto out;
}
/*
* A packet is received.
*/
/*
* Adjust for odd-length packet.
*/
if (status & RS_ODDFRAME)
packet_length++;
/*
* Allocate a header mbuf from the kernel.
*/
MGETHDR(m, M_NOWAIT, MT_DATA);
if (m == NULL)
goto out;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = packet_length;
/*
* Attach an mbuf cluster.
*/
if (!(MCLGET(m, M_NOWAIT))) {
m_freem(m);
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
printf("sn: snread() kernel memory allocation problem\n");
goto out;
}
eh = mtod(m, struct ether_header *);
/*
* Get packet, including link layer address, from interface.
*/
data = (uint8_t *) eh;
CSR_READ_MULTI_2(sc, DATA_REG_W, (uint16_t *) data, packet_length >> 1);
if (packet_length & 1) {
data += packet_length & ~1;
*data = CSR_READ_1(sc, DATA_REG_B);
}
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
/*
* Remove link layer addresses and whatnot.
*/
m->m_pkthdr.len = m->m_len = packet_length;
/*
* Drop locks before calling if_input() since it may re-enter
* snstart() in the netisr case. This would result in a
* lock reversal. Better performance might be obtained by
* chaining all packets received, dropping the lock, and then
* calling if_input() on each one.
*/
SN_UNLOCK(sc);
(*ifp->if_input)(ifp, m);
SN_LOCK(sc);
out:
/*
* Error or good, tell the card to get rid of this packet Wait for
* the MMU to be un-busy.
*/
SMC_SELECT_BANK(sc, 2);
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_RELEASE);
/*
* Check whether another packet is ready
*/
packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W);
if (packet_number & FIFO_REMPTY) {
return;
}
goto read_another;
}
/*
* Handle IOCTLS. This function is completely stolen from if_ep.c
* As with its progenitor, it does not handle hardware address
* changes.
*/
static int
snioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct sn_softc *sc = ifp->if_softc;
int error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
SN_LOCK(sc);
if ((ifp->if_flags & IFF_UP) == 0 &&
ifp->if_drv_flags & IFF_DRV_RUNNING) {
snstop(sc);
} else {
/* reinitialize card on any parameter change */
sninit_locked(sc);
}
SN_UNLOCK(sc);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/* update multicast filter list. */
SN_LOCK(sc);
sn_setmcast(sc);
error = 0;
SN_UNLOCK(sc);
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
return (error);
}
static void
snwatchdog(void *arg)
{
struct sn_softc *sc;
sc = arg;
SN_ASSERT_LOCKED(sc);
callout_reset(&sc->watchdog, hz, snwatchdog, sc);
if (sc->timer == 0 || --sc->timer > 0)
return;
snintr_locked(sc);
}
/* 1. zero the interrupt mask
* 2. clear the enable receive flag
* 3. clear the enable xmit flags
*/
static void
snstop(struct sn_softc *sc)
{
struct ifnet *ifp = sc->ifp;
/*
* Clear interrupt mask; disable all interrupts.
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00);
/*
* Disable transmitter and Receiver
*/
SMC_SELECT_BANK(sc, 0);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, 0x0000);
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, 0x0000);
/*
* Cancel watchdog.
*/
sc->timer = 0;
callout_stop(&sc->watchdog);
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
}
int
sn_activate(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
sc->port_rid = 0;
sc->port_res = bus_alloc_resource_anywhere(dev, SYS_RES_IOPORT,
&sc->port_rid, SMC_IO_EXTENT, RF_ACTIVE);
if (!sc->port_res) {
if (bootverbose)
device_printf(dev, "Cannot allocate ioport\n");
return ENOMEM;
}
sc->irq_rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irq_rid,
RF_ACTIVE);
if (!sc->irq_res) {
if (bootverbose)
device_printf(dev, "Cannot allocate irq\n");
sn_deactivate(dev);
return ENOMEM;
}
return (0);
}
void
sn_deactivate(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
if (sc->port_res)
bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid,
sc->port_res);
sc->port_res = 0;
if (sc->modem_res)
bus_release_resource(dev, SYS_RES_IOPORT, sc->modem_rid,
sc->modem_res);
sc->modem_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,
sc->irq_res);
sc->irq_res = 0;
return;
}
/*
* Function: sn_probe(device_t dev)
*
* Purpose:
* Tests to see if a given ioaddr points to an SMC9xxx chip.
* Tries to cause as little damage as possible if it's not a SMC chip.
* Returns a 0 on success
*
* Algorithm:
* (1) see if the high byte of BANK_SELECT is 0x33
* (2) compare the ioaddr with the base register's address
* (3) see if I recognize the chip ID in the appropriate register
*
*
*/
int
sn_probe(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
uint16_t bank;
uint16_t revision_register;
uint16_t base_address_register;
int err;
if ((err = sn_activate(dev)) != 0)
return err;
/*
* First, see if the high byte is 0x33
*/
bank = CSR_READ_2(sc, BANK_SELECT_REG_W);
if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) {
#ifdef SN_DEBUG
device_printf(dev, "test1 failed\n");
#endif
goto error;
}
/*
* The above MIGHT indicate a device, but I need to write to further
* test this. Go to bank 0, then test that the register still
* reports the high byte is 0x33.
*/
CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x0000);
bank = CSR_READ_2(sc, BANK_SELECT_REG_W);
if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) {
#ifdef SN_DEBUG
device_printf(dev, "test2 failed\n");
#endif
goto error;
}
/*
* well, we've already written once, so hopefully another time won't
* hurt. This time, I need to switch the bank register to bank 1, so
* I can access the base address register. The contents of the
* BASE_ADDR_REG_W register, after some jiggery pokery, is expected
* to match the I/O port address where the adapter is being probed.
*/
CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x0001);
base_address_register = (CSR_READ_2(sc, BASE_ADDR_REG_W) >> 3) & 0x3e0;
if (rman_get_start(sc->port_res) != base_address_register) {
/*
* Well, the base address register didn't match. Must not
* have been a SMC chip after all.
*/
#ifdef SN_DEBUG
device_printf(dev, "test3 failed ioaddr = 0x%x, "
"base_address_register = 0x%x\n",
rman_get_start(sc->port_res), base_address_register);
#endif
goto error;
}
/*
* Check if the revision register is something that I recognize.
* These might need to be added to later, as future revisions could
* be added.
*/
CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x3);
revision_register = CSR_READ_2(sc, REVISION_REG_W);
if (!chip_ids[(revision_register >> 4) & 0xF]) {
/*
* I don't regonize this chip, so...
*/
#ifdef SN_DEBUG
device_printf(dev, "test4 failed\n");
#endif
goto error;
}
/*
* at this point I'll assume that the chip is an SMC9xxx. It might be
* prudent to check a listing of MAC addresses against the hardware
* address, or do some other tests.
*/
sn_deactivate(dev);
return 0;
error:
sn_deactivate(dev);
return ENXIO;
}
#define MCFSZ 8
static void
sn_setmcast(struct sn_softc *sc)
{
struct ifnet *ifp = sc->ifp;
int flags;
uint8_t mcf[MCFSZ];
SN_ASSERT_LOCKED(sc);
/*
* Set the receiver filter. We want receive enabled and auto strip
* of CRC from received packet. If we are promiscuous then set that
* bit too.
*/
flags = RCR_ENABLE | RCR_STRIP_CRC;
if (ifp->if_flags & IFF_PROMISC) {
flags |= RCR_PROMISC | RCR_ALMUL;
} else if (ifp->if_flags & IFF_ALLMULTI) {
flags |= RCR_ALMUL;
} else {
if (sn_getmcf(ifp, mcf)) {
/* set filter */
SMC_SELECT_BANK(sc, 3);
CSR_WRITE_2(sc, MULTICAST1_REG_W,
((uint16_t)mcf[1] << 8) | mcf[0]);
CSR_WRITE_2(sc, MULTICAST2_REG_W,
((uint16_t)mcf[3] << 8) | mcf[2]);
CSR_WRITE_2(sc, MULTICAST3_REG_W,
((uint16_t)mcf[5] << 8) | mcf[4]);
CSR_WRITE_2(sc, MULTICAST4_REG_W,
((uint16_t)mcf[7] << 8) | mcf[6]);
} else {
flags |= RCR_ALMUL;
}
}
SMC_SELECT_BANK(sc, 0);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, flags);
}
static int
sn_getmcf(struct ifnet *ifp, uint8_t *mcf)
{
int i;
uint32_t index, index2;
uint8_t *af = mcf;
struct ifmultiaddr *ifma;
bzero(mcf, MCFSZ);
if_maddr_rlock(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK) {
if_maddr_runlock(ifp);
return 0;
}
index = ether_crc32_le(LLADDR((struct sockaddr_dl *)
ifma->ifma_addr), ETHER_ADDR_LEN) & 0x3f;
index2 = 0;
for (i = 0; i < 6; i++) {
index2 <<= 1;
index2 |= (index & 0x01);
index >>= 1;
}
af[index2 >> 3] |= 1 << (index2 & 7);
}
if_maddr_runlock(ifp);
return 1; /* use multicast filter */
}
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