Current Path : /sys/dev/iicbus/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/dev/iicbus/if_ic.c |
/*- * Copyright (c) 1998, 2001 Nicolas Souchu * 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. * * 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: release/9.1.0/sys/dev/iicbus/if_ic.c 223741 2011-07-03 16:08:38Z bz $"); /* * I2C bus IP driver */ #include <sys/param.h> #include <sys/systm.h> #include <sys/mbuf.h> #include <sys/socket.h> #include <sys/filio.h> #include <sys/sockio.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/module.h> #include <sys/mutex.h> #include <sys/bus.h> #include <sys/time.h> #include <sys/malloc.h> #include <net/if.h> #include <net/if_types.h> #include <net/netisr.h> #include <net/route.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/in_var.h> #include <netinet/ip.h> #include <netinet/if_ether.h> #include <net/bpf.h> #include <dev/iicbus/iiconf.h> #include <dev/iicbus/iicbus.h> #include "iicbus_if.h" #define PCF_MASTER_ADDRESS 0xaa #define ICHDRLEN sizeof(u_int32_t) #define ICMTU 1500 /* default mtu */ struct ic_softc { struct ifnet *ic_ifp; device_t ic_dev; u_char ic_addr; /* peer I2C address */ int ic_flags; char *ic_obuf; char *ic_ifbuf; char *ic_cp; int ic_xfercnt; int ic_iferrs; struct mtx ic_lock; }; #define IC_SENDING 0x0001 #define IC_OBUF_BUSY 0x0002 #define IC_IFBUF_BUSY 0x0004 #define IC_BUFFERS_BUSY (IC_OBUF_BUSY | IC_IFBUF_BUSY) #define IC_BUFFER_WAITER 0x0004 static devclass_t ic_devclass; static int icprobe(device_t); static int icattach(device_t); static int icioctl(struct ifnet *, u_long, caddr_t); static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *, struct route *); static int icintr(device_t, int, char *); static device_method_t ic_methods[] = { /* device interface */ DEVMETHOD(device_probe, icprobe), DEVMETHOD(device_attach, icattach), /* iicbus interface */ DEVMETHOD(iicbus_intr, icintr), { 0, 0 } }; static driver_t ic_driver = { "ic", ic_methods, sizeof(struct ic_softc), }; static void ic_alloc_buffers(struct ic_softc *sc, int mtu) { char *obuf, *ifbuf; obuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); ifbuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); mtx_lock(&sc->ic_lock); while (sc->ic_flags & IC_BUFFERS_BUSY) { sc->ic_flags |= IC_BUFFER_WAITER; mtx_sleep(sc, &sc->ic_lock, 0, "icalloc", 0); sc->ic_flags &= ~IC_BUFFER_WAITER; } free(sc->ic_obuf, M_DEVBUF); free(sc->ic_ifbuf, M_DEVBUF); sc->ic_obuf = obuf; sc->ic_ifbuf = ifbuf; sc->ic_ifp->if_mtu = mtu; mtx_unlock(&sc->ic_lock); } /* * icprobe() */ static int icprobe(device_t dev) { return (BUS_PROBE_NOWILDCARD); } /* * icattach() */ static int icattach(device_t dev) { struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); struct ifnet *ifp; ifp = sc->ic_ifp = if_alloc(IFT_PARA); if (ifp == NULL) return (ENOSPC); mtx_init(&sc->ic_lock, device_get_nameunit(dev), MTX_NETWORK_LOCK, MTX_DEF); sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ sc->ic_dev = dev; ifp->if_softc = sc; if_initname(ifp, device_get_name(dev), device_get_unit(dev)); ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; ifp->if_ioctl = icioctl; ifp->if_output = icoutput; ifp->if_hdrlen = 0; ifp->if_addrlen = 0; ifp->if_snd.ifq_maxlen = ifqmaxlen; ic_alloc_buffers(sc, ICMTU); if_attach(ifp); bpfattach(ifp, DLT_NULL, ICHDRLEN); return (0); } /* * iciotcl() */ static int icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct ic_softc *sc = ifp->if_softc; device_t icdev = sc->ic_dev; device_t parent = device_get_parent(icdev); struct ifaddr *ifa = (struct ifaddr *)data; struct ifreq *ifr = (struct ifreq *)data; int error; switch (cmd) { case SIOCSIFDSTADDR: case SIOCAIFADDR: case SIOCSIFADDR: if (ifa->ifa_addr->sa_family != AF_INET) return (EAFNOSUPPORT); mtx_lock(&sc->ic_lock); ifp->if_flags |= IFF_UP; goto locked; case SIOCSIFFLAGS: mtx_lock(&sc->ic_lock); locked: if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_drv_flags & IFF_DRV_RUNNING)) { /* XXX disable PCF */ ifp->if_drv_flags &= ~IFF_DRV_RUNNING; mtx_unlock(&sc->ic_lock); /* IFF_UP is not set, try to release the bus anyway */ iicbus_release_bus(parent, icdev); break; } if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { mtx_unlock(&sc->ic_lock); if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT | IIC_INTR))) return (error); mtx_lock(&sc->ic_lock); iicbus_reset(parent, IIC_FASTEST, 0, NULL); ifp->if_drv_flags |= IFF_DRV_RUNNING; } mtx_unlock(&sc->ic_lock); break; case SIOCSIFMTU: ic_alloc_buffers(sc, ifr->ifr_mtu); break; case SIOCGIFMTU: mtx_lock(&sc->ic_lock); ifr->ifr_mtu = sc->ic_ifp->if_mtu; mtx_unlock(&sc->ic_lock); break; case SIOCADDMULTI: case SIOCDELMULTI: if (ifr == 0) return (EAFNOSUPPORT); /* XXX */ switch (ifr->ifr_addr.sa_family) { case AF_INET: break; default: return (EAFNOSUPPORT); } break; default: return (EINVAL); } return (0); } /* * icintr() */ static int icintr(device_t dev, int event, char *ptr) { struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); struct mbuf *top; int len; mtx_lock(&sc->ic_lock); switch (event) { case INTR_GENERAL: case INTR_START: sc->ic_cp = sc->ic_ifbuf; sc->ic_xfercnt = 0; sc->ic_flags |= IC_IFBUF_BUSY; break; case INTR_STOP: /* if any error occured during transfert, * drop the packet */ sc->ic_flags &= ~IC_IFBUF_BUSY; if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == IC_BUFFER_WAITER) wakeup(&sc); if (sc->ic_iferrs) goto err; if ((len = sc->ic_xfercnt) == 0) break; /* ignore */ if (len <= ICHDRLEN) goto err; len -= ICHDRLEN; sc->ic_ifp->if_ipackets++; sc->ic_ifp->if_ibytes += len; BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN); top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0); if (top) { mtx_unlock(&sc->ic_lock); M_SETFIB(top, sc->ic_ifp->if_fib); netisr_dispatch(NETISR_IP, top); mtx_lock(&sc->ic_lock); } break; err: if_printf(sc->ic_ifp, "errors (%d)!\n", sc->ic_iferrs); sc->ic_iferrs = 0; /* reset error count */ sc->ic_ifp->if_ierrors++; break; case INTR_RECEIVE: if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu + ICHDRLEN) { sc->ic_iferrs++; } else { *sc->ic_cp++ = *ptr; sc->ic_xfercnt++; } break; case INTR_NOACK: /* xfer terminated by master */ break; case INTR_TRANSMIT: *ptr = 0xff; /* XXX */ break; case INTR_ERROR: sc->ic_iferrs++; break; default: panic("%s: unknown event (%d)!", __func__, event); } mtx_unlock(&sc->ic_lock); return (0); } /* * icoutput() */ static int icoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct route *ro) { struct ic_softc *sc = ifp->if_softc; device_t icdev = sc->ic_dev; device_t parent = device_get_parent(icdev); int len, sent; struct mbuf *mm; u_char *cp; u_int32_t hdr; /* BPF writes need to be handled specially. */ if (dst->sa_family == AF_UNSPEC) bcopy(dst->sa_data, &hdr, sizeof(hdr)); else hdr = dst->sa_family; mtx_lock(&sc->ic_lock); ifp->if_drv_flags |= IFF_DRV_RUNNING; /* already sending? */ if (sc->ic_flags & IC_SENDING) { ifp->if_oerrors++; goto error; } /* insert header */ bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); cp = sc->ic_obuf + ICHDRLEN; len = 0; mm = m; do { if (len + mm->m_len > sc->ic_ifp->if_mtu) { /* packet too large */ ifp->if_oerrors++; goto error; } bcopy(mtod(mm,char *), cp, mm->m_len); cp += mm->m_len; len += mm->m_len; } while ((mm = mm->m_next)); BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); sc->ic_flags |= (IC_SENDING | IC_OBUF_BUSY); m_freem(m); mtx_unlock(&sc->ic_lock); /* send the packet */ if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, len + ICHDRLEN, &sent)) ifp->if_oerrors++; else { ifp->if_opackets++; ifp->if_obytes += len; } mtx_lock(&sc->ic_lock); sc->ic_flags &= ~(IC_SENDING | IC_OBUF_BUSY); if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == IC_BUFFER_WAITER) wakeup(&sc); mtx_unlock(&sc->ic_lock); return (0); error: m_freem(m); mtx_unlock(&sc->ic_lock); return(0); } DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); MODULE_VERSION(ic, 1);