diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/hil/hil.c | 586 |
1 files changed, 586 insertions, 0 deletions
diff --git a/sys/dev/hil/hil.c b/sys/dev/hil/hil.c new file mode 100644 index 00000000000..29af438fc52 --- /dev/null +++ b/sys/dev/hil/hil.c @@ -0,0 +1,586 @@ +/* $OpenBSD: hil.c,v 1.1 2003/02/11 19:40:20 miod Exp $ */ +/* + * Copyright (c) 2003, Miodrag Vallat. + * 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 ``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. + * + */ + +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * 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 the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + * + * from: Utah $Hdr: hil.c 1.38 92/01/21$ + * + * @(#)hil.c 8.2 (Berkeley) 1/12/94 + */ + +#undef HILDEBUG + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/conf.h> +#include <sys/device.h> +#include <sys/file.h> +#include <sys/ioctl.h> +#include <sys/kernel.h> +#include <sys/proc.h> + +#include <machine/autoconf.h> +#include <machine/bus.h> +#include <machine/cpu.h> + +#include <dev/hil/hilreg.h> +#include <dev/hil/hilvar.h> +#include <dev/hil/hildevs.h> +#include <dev/hil/hildevs_data.h> + +#define splhil spltty + +struct cfdriver hil_cd = { + NULL, "hil", DV_DULL +}; + +void hilconfig(struct hil_softc *); + +void hil_process_int(struct hil_softc *, u_int8_t, u_int8_t); +void polloff(struct hil_softc *); +void pollon(struct hil_softc *); + +static void hilwait(struct hil_softc *); +static void hildatawait(struct hil_softc *); + +static __inline void +hilwait(struct hil_softc *sc) +{ + while (bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_STAT) & HIL_BUSY) { + /* nothing */ + } +} + +static __inline void +hildatawait(struct hil_softc *sc) +{ + while (!(bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_STAT) & + HIL_DATA_RDY)) { + /* nothing */ + } +} + +/* + * Common HIL bus attachment + */ + +void +hil_attach(struct hil_softc *sc) +{ + printf("\n"); + + /* + * Initialize loop information + */ + sc->sc_cmdending = 0; + sc->sc_actdev = sc->sc_cmddev = 0; + sc->sc_cmddone = 0; + sc->sc_cmdbp = sc->sc_cmdbuf; + sc->sc_pollbp = sc->sc_pollbuf; + sc->sc_kbddev = 0; +} + +/* + * HIL subdevice attachment + */ + +int +hildevprint(void *aux, const char *pnp) +{ + struct hil_attach_args *ha = aux; + + if (pnp != NULL) { + printf("\"%s\" at %s id %x", + ha->ha_descr, pnp, ha->ha_id); + } + printf(" code %d", ha->ha_code); + if (pnp == NULL) { + printf(": %s", ha->ha_descr); + } + + return (UNCONF); +} + +void +hil_attach_deferred(void *v) +{ + struct hil_softc *sc = v; + struct hil_attach_args ha; + int id, s, tries; + u_int8_t db; + + /* + * Initialize the loop: reconfigure, don't report errors, + * put keyboard in cooked mode, and enable autopolling. + */ + db = LPC_RECONF | LPC_KBDCOOK | LPC_NOERROR | LPC_AUTOPOLL; + send_hil_cmd(sc, HIL_WRITELPCTRL, &db, 1, NULL); + + /* + * Delay one second for reconfiguration and then read the + * data to clear the interrupt (if the loop reconfigured). + */ + DELAY(1000000); + if (bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_STAT) & + HIL_DATA_RDY) { + db = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_DATA); + } + + /* + * The HIL loop may have reconfigured. If so we proceed on, + * if not we loop a few times until a successful reconfiguration + * is reported back to us. If the HIL loop is still lost after a + * few seconds, give up. + */ + for (tries = 10; tries != 0; tries--) { + send_hil_cmd(sc, HIL_READLPSTAT, NULL, 0, &db); + + if (db & (LPS_CONFFAIL | LPS_CONFGOOD)) + break; + +#ifdef HILDEBUG + printf("%s: loop not ready, retrying...\n", + sc->sc_dev.dv_xname); +#endif + + DELAY(1000000); + } + + if (tries == 0 || (db & LPS_CONFFAIL)) { + printf("%s: loop failed to reconfigure\n", sc->sc_dev.dv_xname); + return; + } + + /* + * At this point, the loop should have reconfigured. + * The reconfiguration interrupt has already called hilconfig(). + */ + send_hil_cmd(sc, HIL_INTON, NULL, 0, NULL); + + /* + * Now attach hil devices as they are found. + */ + + s = splhil(); + + /* Attach the remaining devices */ + for (id = 1; id <= sc->sc_maxdev; id++) { + int len; + const struct hildevice *hd; + + send_hildev_cmd(sc, id, HIL_IDENTIFY); + + len = sc->sc_cmdbp - sc->sc_cmdbuf; + if (len == 0) { +#ifdef HILDEBUG + printf("%s: no device at code %d\n", + sc->sc_dev.dv_xname, id); +#endif + continue; + } + + /* Attach found devices */ + for (hd = hildevs; hd->minid >= 0; hd++) + if (sc->sc_cmdbuf[0] >= hd->minid && + sc->sc_cmdbuf[0] <= hd->maxid) { + + ha.ha_code = id; + ha.ha_type = hd->type; + ha.ha_descr = hd->descr; + ha.ha_infolen = len; + bcopy(sc->sc_cmdbuf, ha.ha_info, len); + + if (ha.ha_type == HIL_DEVICE_KEYBOARD) { + /* + * Currently, the first found hil keyboard will + * be attached as a console keyboard. + * This will change when we have hil at wax + * attachment. + */ + ha.ha_flags = id == sc->sc_kbddev; + } else { + ha.ha_flags = 0; + } + + config_found(&sc->sc_dev, &ha, hildevprint); + } + } + + sc->sc_cmdbp = sc->sc_cmdbuf; + + splx(s); +} + +void +hil_callback_register(struct hil_softc *sc, int hilid, + void (*handler)(void *, u_int, u_int8_t *), void *arg) +{ +#ifdef HILDEBUG + if (hilid < 0 || hilid >= NHILD) + panic("hil_callback_register invoked with hilid %d", hilid); +#endif + + if (sc->sc_cb[hilid].cb_fn != NULL) + panic("hil_callback_register: invoked twice for hilid %d", + hilid); + + sc->sc_cb[hilid].cb_fn = handler; + sc->sc_cb[hilid].cb_arg = arg; +} + +/* + * Asynchronous event processing + */ + +int +hil_intr(void *v) +{ + struct hil_softc *sc = v; + u_int8_t c, stat; + + stat = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_STAT); + c = bus_space_read_1(sc->sc_bst, sc->sc_bsh, + HILP_DATA); /* clears interrupt */ + hil_process_int(sc, stat, c); + + return (1); +} + +void +hil_process_int(struct hil_softc *sc, u_int8_t stat, u_int8_t c) +{ + switch ((stat >> HIL_SSHIFT) & HIL_SMASK) { + case HIL_STATUS: + if (c & HIL_ERROR) { + sc->sc_cmddone = 1; + if (c == HIL_RECONFIG) + hilconfig(sc); + break; + } + if (c & HIL_COMMAND) { + if (c & HIL_POLLDATA) { /* End of data */ + if (sc->sc_cb[sc->sc_actdev].cb_fn != NULL) + sc->sc_cb[sc->sc_actdev].cb_fn + (sc->sc_cb[sc->sc_actdev].cb_arg, + sc->sc_pollbp - sc->sc_pollbuf, + sc->sc_pollbuf); + } else { /* End of command */ + sc->sc_cmdending = 1; + } + sc->sc_actdev = 0; + } else { + if (c & HIL_POLLDATA) { /* Start of polled data */ + sc->sc_actdev = (c & HIL_DEVMASK); + sc->sc_pollbp = sc->sc_pollbuf; + } else { /* Start of command */ + if (sc->sc_cmddev == (c & HIL_DEVMASK)) { + sc->sc_cmdbp = sc->sc_cmdbuf; + sc->sc_actdev = 0; + } + } + } + break; + case HIL_DATA: + if (sc->sc_actdev != 0) /* Collecting poll data */ + *sc->sc_pollbp++ = c; + else { + if (sc->sc_cmddev != 0) { /* Collecting cmd data */ + if (sc->sc_cmdending) { + sc->sc_cmddone = 1; + sc->sc_cmdending = 0; + } else + *sc->sc_cmdbp++ = c; + } + } + break; + } + +} + +/* + * Called after the loop has reconfigured. Here we need to: + * - determine how many devices are on the loop + * (some may have been added or removed) + * - make sure all keyboards are in raw mode (hilkbd depends + * on this) + * Note that our device state is now potentially invalid as + * devices may no longer be where they were. What we should + * do here is either track where the devices went and move + * state around accordingly... + */ +void +hilconfig(struct hil_softc *sc) +{ + u_int8_t db; + int s; + + s = splhil(); + + /* + * Determine how many devices are on the loop. + */ + db = 0; + send_hil_cmd(sc, HIL_READLPSTAT, NULL, 0, &db); + sc->sc_maxdev = db & LPS_DEVMASK; +#ifdef HILDEBUG + printf("%s: %d devices\n", sc->sc_dev.dv_xname, sc->sc_maxdev); +#endif + + /* + * Locate the main keyboard device, if present. + */ + db = 0; + send_hil_cmd(sc, HIL_READKBDSADR, NULL, 0, &db); + sc->sc_kbddev = ffs((int)db); + + /* + * Put all keyboards in raw mode, in case we ended there after + * a reconfigure event. + */ + db = 0; + send_hil_cmd(sc, HIL_WRITEKBDSADR, &db, 1, NULL); + + splx(s); +} + +/* + * Low level routines which actually talk to the 8042 chip. + */ + +/* + * Send a command to the 8042 with zero or more bytes of data. + * If rdata is non-null, wait for and return a byte of data. + * We run at splvm() to make the transaction as atomic as + * possible without blocking the clock (is this necessary?) + */ +void +send_hil_cmd(struct hil_softc *sc, u_int8_t cmd, u_int8_t *data, u_int8_t dlen, + u_int8_t *rdata) +{ + u_int8_t status; + int s = splvm(); + + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, cmd); + while (dlen--) { + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, *data++); + } + if (rdata) { + do { + hildatawait(sc); + status = bus_space_read_1(sc->sc_bst, sc->sc_bsh, + HILP_STAT); + *rdata = bus_space_read_1(sc->sc_bst, sc->sc_bsh, + HILP_DATA); + } while (((status >> HIL_SSHIFT) & HIL_SMASK) != HIL_68K); + } + splx(s); +} + +/* + * Send a command to a device on the loop. + * Since only one command can be active on the loop at any time, + * we must ensure that we are not interrupted during this process. + * Hence we mask interrupts to prevent potential access from most + * interrupt routines and turn off auto-polling to disable the + * internally generated poll commands. + * + * splhigh is extremely conservative but insures atomic operation, + * splvm (clock only interrupts) seems to be good enough in practice. + */ +void +send_hildev_cmd(sc, device, cmd) + struct hil_softc *sc; + char device, cmd; +{ + u_int8_t status, c; + int s = splvm(); + + polloff(sc); + + sc->sc_cmdbp = sc->sc_cmdbuf; + sc->sc_cmddev = device; + + /* + * Transfer the command and device info to the chip + */ + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_STARTCMD); + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, 8 + device); + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, cmd); + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, HIL_TIMEOUT); + + /* + * Trigger the command and wait for completion + */ + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_TRIGGER); + sc->sc_cmddone = 0; + do { + hildatawait(sc); + status = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_STAT); + c = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_DATA); + hil_process_int(sc, status, c); + } while (sc->sc_cmddone == 0); + + sc->sc_cmddev = 0; + + pollon(sc); + + splx(s); +} + +/* + * Turn auto-polling off and on. + */ +void +polloff(struct hil_softc *sc) +{ + char db; + + /* + * Turn off auto repeat + */ + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_SETARR); + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, 0); + + /* + * Turn off auto-polling + */ + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_READLPCTRL); + hildatawait(sc); + db = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_DATA); + db &= ~LPC_AUTOPOLL; + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_WRITELPCTRL); + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, db); + + /* + * Must wait until polling is really stopped + */ + do { + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_READBUSY); + hildatawait(sc); + db = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_DATA); + } while (db & BSY_LOOPBUSY); +} + +void +pollon(struct hil_softc *sc) +{ + char db; + + /* + * Turn on auto polling + */ + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_READLPCTRL); + hildatawait(sc); + db = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_DATA); + db |= LPC_AUTOPOLL; + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_WRITELPCTRL); + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, db); + + /* + * Turn off auto repeat - we emulate this through wscons + */ + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_CMD, HIL_SETARR); + hilwait(sc); + bus_space_write_1(sc->sc_bst, sc->sc_bsh, HILP_DATA, 0); +} + +void +hil_set_poll(struct hil_softc *sc, int on) +{ + if (on) + pollon(sc); + else + polloff(sc); +} + +int +hil_poll_data(struct hil_softc *sc, u_int8_t *stat, u_int8_t *data) +{ + u_int8_t s; + + s = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_STAT); + if ((s & HIL_DATA_RDY) == 0) + return -1; + + *stat = s; + *data = bus_space_read_1(sc->sc_bst, sc->sc_bsh, HILP_DATA); + + return 0; +} |