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freebsd-dev/sys/dev/sbsh/if_sbsh.c
Warner Losh ad4f426ef6 Make sure that we call if_free(ifp) after bus_teardown_intr. Since we 
could get an interrupt after we free the ifp, and the interrupt
handler depended on the ifp being still alive, this could, in theory,
cause a crash.  Eliminate this possibility by moving the if_free to
after the bus_teardown_intr() call.
2005-09-19 03:10:21 +00:00

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/*-
* Granch SBNI16 G.SHDSL Modem driver
* Written by Denis I. Timofeev, 2002-2003.
*
* 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.
*
* 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/random.h>
#include <machine/clock.h>
#include <machine/stdarg.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/sbsh/if_sbshreg.h>
/* -------------------------------------------------------------------------- */
struct sbni16_hw_regs {
u_int8_t CR, CRB, SR, IMR, CTDR, LTDR, CRDR, LRDR;
};
struct hw_descr {
u_int32_t address;
u_int32_t length;
};
struct cx28975_cmdarea {
u_int8_t intr_host;
u_int8_t intr_8051;
u_int8_t map_version;
u_int8_t in_dest;
u_int8_t in_opcode;
u_int8_t in_zero;
u_int8_t in_length;
u_int8_t in_csum;
u_int8_t in_data[75];
u_int8_t in_datasum;
u_int8_t out_dest;
u_int8_t out_opcode;
u_int8_t out_ack;
u_int8_t out_length;
u_int8_t out_csum;
u_int8_t out_data[75];
u_int8_t out_datasum;
};
#define XQLEN 8
#define RQLEN 8
struct sbsh_softc {
struct ifnet *ifp;
struct resource *mem_res;
struct resource *irq_res;
void *intr_hand;
void *mem_base; /* mapped memory address */
volatile struct sbni16_hw_regs *regs;
volatile struct hw_descr *tbd;
volatile struct hw_descr *rbd;
volatile struct cx28975_cmdarea *cmdp;
/* SBNI16 controller statistics */
struct sbni16_stats {
u_int32_t sent_pkts, rcvd_pkts;
u_int32_t crc_errs, ufl_errs, ofl_errs, attempts, last_time;
} in_stats;
/* transmit and reception queues */
struct mbuf *xq[XQLEN], *rq[RQLEN];
unsigned head_xq, tail_xq, head_rq, tail_rq;
/* the descriptors mapped onto the first buffers in xq and rq */
unsigned head_tdesc, head_rdesc;
u_int8_t state;
};
struct cx28975_cfg {
u_int8_t *firmw_image;
u_int32_t firmw_len;
u_int32_t lrate: 10;
u_int32_t master: 1;
u_int32_t mod: 2;
u_int32_t crc16: 1;
u_int32_t fill_7e: 1;
u_int32_t inv: 1;
u_int32_t rburst: 1;
u_int32_t wburst: 1;
u_int32_t : 14;
};
/* SHDSL transceiver statistics */
struct dsl_stats {
u_int8_t status_1, status_3;
u_int8_t attenuat, nmr, tpbo, rpbo;
u_int16_t losw, segd, crc, sega, losd;
};
enum State { NOT_LOADED, DOWN, ACTIVATION, ACTIVE };
#define SIOCLOADFIRMW _IOWR('i', 67, struct ifreq)
#define SIOCGETSTATS _IOWR('i', 68, struct ifreq)
#define SIOCCLRSTATS _IOWR('i', 69, struct ifreq)
static int sbsh_probe(device_t);
static int sbsh_attach(device_t);
static int sbsh_detach(device_t);
static int sbsh_ioctl(struct ifnet *, u_long, caddr_t);
static void sbsh_shutdown(device_t);
static int sbsh_suspend(device_t);
static int sbsh_resume(device_t);
static void sbsh_watchdog(struct ifnet *);
static void sbsh_start(struct ifnet *);
static void sbsh_init(void *);
static void sbsh_stop(struct sbsh_softc *);
static void init_card(struct sbsh_softc *);
static void sbsh_intr(void *);
static void resume_tx(struct sbsh_softc *);
static void start_xmit_frames(struct sbsh_softc *);
static void encap_frame(struct sbsh_softc *, struct mbuf *);
static struct mbuf * repack(struct sbsh_softc *, struct mbuf *);
static void free_sent_buffers(struct sbsh_softc *);
static void alloc_rx_buffers(struct sbsh_softc *);
static void indicate_frames(struct sbsh_softc *);
static void drop_queues(struct sbsh_softc *);
static void activate(struct sbsh_softc *);
static void deactivate(struct sbsh_softc *);
static void cx28975_interrupt(struct sbsh_softc *);
static int start_cx28975(struct sbsh_softc *, struct cx28975_cfg);
static int download_firmware(struct sbsh_softc *, u_int8_t *, u_int32_t);
static int issue_cx28975_cmd(struct sbsh_softc *, u_int8_t,
u_int8_t *, u_int8_t);
static device_method_t sbsh_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, sbsh_probe),
DEVMETHOD(device_attach, sbsh_attach),
DEVMETHOD(device_detach, sbsh_detach),
DEVMETHOD(device_shutdown, sbsh_shutdown),
DEVMETHOD(device_suspend, sbsh_suspend),
DEVMETHOD(device_resume, sbsh_resume),
{ 0, 0 }
};
static driver_t sbsh_driver = {
"sbsh",
sbsh_methods,
sizeof(struct sbsh_softc)
};
static devclass_t sbsh_devclass;
DRIVER_MODULE(sbsh, pci, sbsh_driver, sbsh_devclass, 0, 0);
MODULE_DEPEND(sbsh, pci, 1, 1, 1);
static int
sbsh_probe(device_t dev)
{
if (pci_get_vendor(dev) != SBNI16_VENDOR
|| pci_get_device(dev) != SBNI16_DEVICE
|| pci_get_subdevice(dev) != SBNI16_SUBDEV)
return (ENXIO);
device_set_desc(dev, "Granch SBNI16 G.SHDSL Modem");
return (BUS_PROBE_DEFAULT);
}
static int
sbsh_attach(device_t dev)
{
struct sbsh_softc *sc;
struct ifnet *ifp;
int unit, error = 0, rid, s;
u_char eaddr[6];
s = splimp();
sc = device_get_softc(dev);
unit = device_get_unit(dev);
rid = PCIR_BAR(1);
sc->mem_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
0, ~0, 4096, RF_ACTIVE);
if (sc->mem_res == NULL) {
printf ("sbsh%d: couldn't map memory\n", unit);
error = ENXIO;
goto fail;
}
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_SHAREABLE | RF_ACTIVE);
if (sc->irq_res == NULL) {
printf("sbsh%d: couldn't map interrupt\n", unit);
bus_release_resource(dev, SYS_RES_MEMORY,
PCIR_BAR(1), sc->mem_res);
error = ENXIO;
goto fail;
}
sc->mem_base = rman_get_virtual(sc->mem_res);
init_card(sc);
error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET,
sbsh_intr, sc, &sc->intr_hand);
if (error) {
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
bus_release_resource(dev, SYS_RES_MEMORY,
PCIR_BAR(1), sc->mem_res);
printf("sbsh%d: couldn't set up irq\n", unit);
goto fail;
}
/* generate ethernet MAC address */
*(u_int32_t *)eaddr = htonl(0x00ff0192);
read_random(eaddr + 4, 2);
ifp = sc->ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
bus_release_resource(dev, SYS_RES_MEMORY,
PCIR_BAR(1), sc->mem_res);
bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
printf("sbsh%d: can not if_alloc()\n", unit);
goto fail;
}
ifp->if_softc = sc;
if_initname(ifp, device_get_name(dev), device_get_unit(dev));
ifp->if_mtu = ETHERMTU;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
IFF_NEEDSGIANT;
ifp->if_ioctl = sbsh_ioctl;
ifp->if_start = sbsh_start;
ifp->if_watchdog = sbsh_watchdog;
ifp->if_init = sbsh_init;
ifp->if_baudrate = 4600000;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
ether_ifattach(ifp, eaddr);
fail:
splx(s);
return (error);
}
static int
sbsh_detach(device_t dev)
{
struct sbsh_softc *sc;
struct ifnet *ifp;
int s;
s = splimp();
sc = device_get_softc(dev);
ifp = sc->ifp;
sbsh_stop(sc);
ether_ifdetach(ifp);
bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
bus_release_resource(dev, SYS_RES_MEMORY, PCIR_BAR(1), sc->mem_res);
if_free(ifp);
splx(s);
return (0);
}
static void
sbsh_start(struct ifnet *ifp)
{
struct sbsh_softc *sc = ifp->if_softc;
int s;
if (sc->state != ACTIVE)
return;
s = splimp();
start_xmit_frames(ifp->if_softc);
splx(s);
}
static void
sbsh_init(void *xsc)
{
struct sbsh_softc *sc = xsc;
struct ifnet *ifp = sc->ifp;
int s;
u_int8_t t;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) || sc->state == NOT_LOADED)
return;
s = splimp();
bzero(&sc->in_stats, sizeof(struct sbni16_stats));
sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
sc->head_tdesc = sc->head_rdesc = 0;
sc->regs->IMR = EXT;
t = 2;
issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
sc->state = ACTIVATION;
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
}
splx(s);
}
static void
sbsh_stop(struct sbsh_softc *sc)
{
int s;
u_int8_t t;
s = splimp();
sc->regs->IMR = EXT;
t = 0;
issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
if (sc->state == ACTIVE) {
t = 1;
issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
/* FIX! activation manager state */
/* Is it really must be done here? It calls from intr handler */
deactivate(sc);
}
sc->regs->IMR = 0;
sc->state = DOWN;
splx(s);
}
static void
init_card(struct sbsh_softc *sc)
{
sc->state = NOT_LOADED;
sc->tbd = (struct hw_descr *) sc->mem_base;
sc->rbd = (struct hw_descr *) ((u_int8_t *)sc->mem_base + 0x400);
sc->regs = (struct sbni16_hw_regs *) ((u_int8_t *)sc->mem_base + 0x800);
sc->cmdp = (struct cx28975_cmdarea *) ((u_int8_t *)sc->mem_base + 0xc00);
sc->regs->CR = 0;
sc->regs->SR = 0xff;
sc->regs->IMR = 0;
}
static int
sbsh_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct sbsh_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *) data;
struct cx28975_cfg cfg;
struct dsl_stats ds;
int s, error = 0;
u_int8_t t;
s = splimp();
switch(cmd) {
case SIOCLOADFIRMW:
if ((error = suser(curthread)) != 0)
break;
if (ifp->if_flags & IFF_UP)
error = EBUSY;
bcopy((caddr_t)ifr->ifr_data, (caddr_t)&cfg, sizeof cfg);
if (start_cx28975(sc, cfg) == 0) {
static char *modstr[] = {
"TCPAM32", "TCPAM16", "TCPAM8", "TCPAM4" };
if_printf(sc->ifp, "%s, rate %d, %s\n",
cfg.master ? "master" : "slave",
cfg.lrate << 3, modstr[cfg.mod]);
} else {
if_printf(sc->ifp,
"unable to load firmware\n");
error = EIO;
}
break;
case SIOCGETSTATS :
if ((error = suser(curthread)) != 0)
break;
t = 0;
if (issue_cx28975_cmd(sc, _DSL_FAR_END_ATTEN, &t, 1))
error = EIO;
ds.attenuat = sc->cmdp->out_data[0];
if (issue_cx28975_cmd(sc, _DSL_NOISE_MARGIN, &t, 1))
error = EIO;
ds.nmr = sc->cmdp->out_data[0];
if (issue_cx28975_cmd(sc, _DSL_POWER_BACK_OFF_RESULT, &t, 1))
error = EIO;
ds.tpbo = sc->cmdp->out_data[0];
ds.rpbo = sc->cmdp->out_data[1];
if (!issue_cx28975_cmd(sc, _DSL_HDSL_PERF_ERR_CTRS, &t, 1)) {
int i;
for (i = 0; i < 10; ++i)
((u_int8_t *) &ds.losw)[i] =
sc->cmdp->out_data[i];
} else
error = EIO;
ds.status_1 = ((volatile u_int8_t *)sc->cmdp)[0x3c0];
ds.status_3 = ((volatile u_int8_t *)sc->cmdp)[0x3c2];
bcopy(&sc->in_stats, ifr->ifr_data, sizeof(struct sbni16_stats));
bcopy(&ds, ifr->ifr_data + sizeof(struct sbni16_stats),
sizeof(struct dsl_stats));
break;
case SIOCCLRSTATS :
if (!(error = suser(curthread))) {
bzero(&sc->in_stats, sizeof(struct sbni16_stats));
t = 2;
if (issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1))
error = EIO;
}
break;
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP) {
if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
if (sc->state == NOT_LOADED) {
if_printf(ifp, "firmware wasn't loaded\n");
error = EBUSY;
} else
sbsh_init(sc);
}
} else {
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
sbsh_stop(sc);
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
}
}
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
error = 0;
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
splx(s);
return (error);
}
static void
sbsh_shutdown(device_t dev)
{
struct sbsh_softc *sc = device_get_softc(dev);
sbsh_stop(sc);
}
static int
sbsh_suspend(device_t dev)
{
struct sbsh_softc *sc = device_get_softc(dev);
int s;
s = splimp();
sbsh_stop(sc);
splx(s);
return (0);
}
static int
sbsh_resume(device_t dev)
{
struct sbsh_softc *sc = device_get_softc(dev);
struct ifnet *ifp;
int s;
s = splimp();
ifp = sc->ifp;
if (ifp->if_flags & IFF_UP)
sbsh_init(sc);
splx(s);
return (0);
}
static void
sbsh_watchdog(struct ifnet *ifp)
{
struct sbsh_softc *sc = ifp->if_softc;
if_printf(ifp, "transmit timeout\n");
if (sc->regs->SR & TXS) {
sc->regs->SR = TXS;
if_printf(ifp, "interrupt posted but not delivered\n");
}
free_sent_buffers(sc);
}
/* -------------------------------------------------------------------------- */
static void
sbsh_intr(void *arg)
{
struct sbsh_softc *sc = (struct sbsh_softc *)arg;
u_int8_t status = sc->regs->SR;
if (status == 0)
return;
if (status & EXT) {
cx28975_interrupt(sc);
sc->regs->SR = EXT;
}
if (status & UFL) {
resume_tx(sc);
sc->regs->SR = UFL;
++sc->in_stats.ufl_errs;
++sc->ifp->if_oerrors;
}
if (status & RXS) {
sc->regs->SR = RXS;
indicate_frames(sc);
alloc_rx_buffers(sc);
}
if (status & TXS) {
sc->regs->SR = TXS;
free_sent_buffers(sc);
}
if (status & CRC) {
++sc->in_stats.crc_errs;
++sc->ifp->if_ierrors;
sc->regs->SR = CRC;
}
if (status & OFL) {
++sc->in_stats.ofl_errs;
++sc->ifp->if_ierrors;
sc->regs->SR = OFL;
}
}
/*
* Look for a first descriptor of a next packet, and write it's number
* into CTDR. Then enable the transmitter.
*/
static void
resume_tx(struct sbsh_softc *sc)
{
u_int32_t cur_tbd = sc->regs->CTDR;
while (cur_tbd != sc->regs->LTDR
&& (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
;
sc->regs->CTDR = cur_tbd;
sc->regs->CR |= TXEN;
}
static void
start_xmit_frames(struct sbsh_softc *sc)
{
struct ifnet *ifp = sc->ifp;
struct mbuf *m;
/*
* Check if we have any free descriptor(s) and free space in
* our transmit queue.
*/
while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
&& sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
IF_DEQUEUE(&ifp->if_snd, m);
if (!m)
break;
if (m->m_pkthdr.len) {
BPF_MTAP(ifp, m);
encap_frame(sc, m);
} else
m_freem(m);
}
if (sc->regs->CTDR != sc->regs->LTDR)
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
else
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
}
/*
* MUST be called at splimp
*/
static void
encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
{
struct mbuf *m;
u_int32_t cur_tbd;
int done;
look_for_nonzero:
for (m = m_head; !m->m_len; m = m->m_next)
;
cur_tbd = sc->regs->LTDR & 0x7f;
done = 0;
do {
if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
if ((m_head = repack(sc, m_head)) != NULL)
goto look_for_nonzero;
else
return;
}
sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
sc->tbd[cur_tbd].length = m->m_len;
do {
m = m->m_next;
} while (m && !m->m_len);
if (!m) { /* last fragment has been reached */
sc->tbd[cur_tbd].length |= LAST_FRAG;
done = 1;
}
++cur_tbd;
cur_tbd &= 0x7f;
} while (!done);
sc->xq[sc->tail_xq++] = m_head;
sc->tail_xq &= (XQLEN - 1);
sc->regs->LTDR = cur_tbd;
++sc->in_stats.sent_pkts;
++sc->ifp->if_opackets;
}
static struct mbuf *
repack(struct sbsh_softc *sc, struct mbuf *m)
{
struct mbuf *m_new;
MGETHDR(m_new, M_DONTWAIT, MT_DATA);
if (!m_new) {
if_printf (sc->ifp,
"unable to get mbuf.\n");
return (NULL);
}
if (m->m_pkthdr.len > MHLEN) {
MCLGET(m_new, M_DONTWAIT);
if (!(m_new->m_flags & M_EXT)) {
m_freem(m_new);
if_printf (sc->ifp,
"unable to get mbuf cluster.\n");
return (NULL);
}
}
m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
m_freem(m);
return (m_new);
}
static void
free_sent_buffers(struct sbsh_softc *sc)
{
u_int32_t cur_tbd;
cur_tbd = sc->regs->CTDR;
while (sc->head_tdesc != cur_tbd) {
/*
* Be careful! one element in xq may correspond to
* multiple descriptors.
*/
if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
m_freem(sc->xq[sc->head_xq++]);
sc->head_xq &= (XQLEN - 1);
}
sc->tbd[sc->head_tdesc].length = 0;
sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
}
start_xmit_frames(sc);
}
/*
* DON'T use free_sent_buffers to drop the queue!
*/
static void
alloc_rx_buffers(struct sbsh_softc *sc)
{
unsigned cur_rbd = sc->regs->LRDR & 0x7f;
struct mbuf *m;
while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (!m) {
if_printf (sc->ifp,
"unable to get mbuf.\n");
return;
}
if (SBNI16_MAX_FRAME > MHLEN) {
MCLGET(m, M_DONTWAIT);
if (!(m->m_flags & M_EXT)) {
m_freem(m);
if_printf (sc->ifp,
"unable to get mbuf cluster.\n");
return;
}
m->m_pkthdr.len = m->m_len = MCLBYTES;
}
m_adj(m, 2); /* align ip on longword boundaries */
sc->rq[sc->tail_rq++] = m;
sc->tail_rq &= (RQLEN - 1);
sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
sc->rbd[cur_rbd].length = 0;
sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
}
}
static void
indicate_frames(struct sbsh_softc *sc)
{
unsigned cur_rbd = sc->regs->CRDR & 0x7f;
while (sc->head_rdesc != cur_rbd) {
struct mbuf *m = sc->rq[sc->head_rq++];
sc->head_rq &= (RQLEN - 1);
m->m_pkthdr.len = m->m_len =
sc->rbd[sc->head_rdesc].length & 0x7ff;
m->m_pkthdr.rcvif = sc->ifp;
(*sc->ifp->if_input)(sc->ifp, m);
++sc->in_stats.rcvd_pkts;
++sc->ifp->if_ipackets;
sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
}
}
static void
drop_queues(struct sbsh_softc *sc)
{
while (sc->head_rq != sc->tail_rq) {
m_freem(sc->rq[sc->head_rq++]);
sc->head_rq &= (RQLEN - 1);
}
while (sc->head_xq != sc->tail_xq) {
m_freem(sc->xq[sc->head_xq++]);
sc->head_xq &= (XQLEN - 1);
}
}
/* -------------------------------------------------------------------------- */
static void
activate(struct sbsh_softc *sc)
{
struct timeval tv;
sc->regs->SR = 0xff; /* clear it! */
sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
sc->head_tdesc = sc->head_rdesc = 0;
alloc_rx_buffers(sc);
sc->regs->CRB &= ~RXDE;
sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
sc->regs->CR |= TXEN | RXEN;
sc->state = ACTIVE;
++sc->in_stats.attempts;
microtime(&tv);
sc->in_stats.last_time = tv.tv_sec;
start_xmit_frames(sc);
}
static void
deactivate(struct sbsh_softc *sc)
{
sc->regs->CR &= ~(RXEN | TXEN);
sc->regs->CRB |= RXDE;
sc->regs->IMR = EXT;
sc->regs->CTDR = sc->regs->LTDR;
sc->regs->CRDR = sc->regs->LRDR;
sc->state = ACTIVATION;
drop_queues(sc);
}
/* -------------------------------------------------------------------------- */
static void
cx28975_interrupt(struct sbsh_softc *sc)
{
volatile struct cx28975_cmdarea *p = sc->cmdp;
u_int8_t t;
if (p->intr_host != 0xfe)
return;
if (p->out_ack & 0x80) {
if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
if (sc->state != ACTIVE
&& (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
activate(sc);
if_printf(sc->ifp, "connected to peer\n");
} else if (sc->state == ACTIVE
&& (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
deactivate(sc);
if_printf(sc->ifp, "carrier lost\n");
}
}
p->intr_host = 0;
t = p->intr_host;
p->out_ack = 0;
} else {
wakeup(sc);
p->intr_host = 0;
t = p->intr_host;
}
}
/* -------------------------------------------------------------------------- */
static int
start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
{
static char thresh[] = { +8, -4, -16, -40 };
volatile struct cx28975_cmdarea *p = sc->cmdp;
u_int8_t t, parm[12];
p->intr_host = 0;
t = p->intr_host;
/* reset chip set */
sc->regs->IMR = EXT;
sc->regs->CR = 0;
sc->regs->SR = 0xff;
DELAY(2);
sc->regs->CR = XRST;
if (cfg.crc16)
sc->regs->CR |= CMOD;
if (cfg.fill_7e)
sc->regs->CR |= FMOD;
if (cfg.inv)
sc->regs->CR |= PMOD;
sc->regs->CRB |= RODD | RXDE;
if (cfg.rburst)
sc->regs->CRB |= RDBE;
if (cfg.wburst)
sc->regs->CRB |= WTBE;
tsleep(sc, PWAIT, "sbsh", 0);
if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
return (-1);
if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
return (-1);
tsleep(sc, PWAIT, "sbsh", 0);
if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
return (-1);
t = cfg.master ? 1 : 9;
if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
return (-1);
t = 0x63;
if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
return (-1);
*(u_int16_t *)parm = cfg.lrate >> 3;
parm[2] = parm[3] = parm[0];
parm[5] = cfg.lrate & 7;
parm[4] = parm[7] = 1;
parm[6] = 0;
if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
return (-1);
parm[0] = 0x02 | (cfg.mod << 4);
parm[1] = 0;
if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
return (-1);
bzero(parm, 12);
parm[0] = 0x04; /* pre-activation: G.hs */
parm[4] = 0x04; /* no remote configuration */
parm[7] = 0x01; /* annex A (default) */
parm[8] = 0xff; /* i-bit mask (all bits) */
if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
return (-1);
parm[0] = 0x03; /* dying gasp time - 3 frames */
parm[1] = thresh[cfg.mod];
parm[2] = 0xff; /* attenuation */
parm[3] = 0x04; /* line probe NMR (+2 dB) */
parm[4] = 0x00; /* reserved */
parm[5] = 0x00;
if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
return (-1);
t = cfg.master ? 0x23 : 0x21;
if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
return (-1);
t = 0x02;
if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
return (-1);
sc->state = DOWN;
return (0);
}
static int
download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
{
u_int32_t t;
int i;
u_int8_t cksum = 0;
for (i = 0; i < img_len; ++i)
cksum += img[i];
t = img_len;
if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
return (-1);
for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
return (-1);
}
if (img_len
&& issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
return (-1);
t = (cksum ^ 0xff) + 1;
if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
return (-1);
return (0);
}
static int
issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
u_int8_t *data, u_int8_t size)
{
volatile struct cx28975_cmdarea *p = sc->cmdp;
u_int8_t *databuf = p->in_data;
int i;
u_int8_t cksum = 0;
p->in_dest = 0xf0;
p->in_opcode = cmd;
p->in_zero = 0;
p->in_length = --size;
p->in_csum = 0xf0 ^ cmd ^ size ^ 0xaa;
for (i = 0; i <= size; ++i) {
cksum ^= *data;
*databuf++ = *data++; /* only 1 byte per cycle! */
}
p->in_datasum = cksum ^ 0xaa;
p->out_ack = _ACK_NOT_COMPLETE;
p->intr_8051 = 0xfe;
if (tsleep(sc, PWAIT, "sbsh", hz << 3))
return (-1);
while (p->out_ack == _ACK_NOT_COMPLETE)
; /* FIXME ! */
if ((p->out_ack & 0x1f) == _ACK_PASS) {
p->out_ack = 0;
return (0);
} else {
p->out_ack = 0;
return (-1);
}
}
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