/* $NetBSD: weasel_pci.c,v 1.16 2016/07/07 06:55:41 msaitoh Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Herb Peyerl and Jason Thorpe. * * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * Device driver for the control space on the Middle Digital, Inc. * PCI-Weasel serial console board. * * Since the other functions of the PCI-Weasel already appear in * PCI configuration space, we just need to hook up the watchdog * timer. */ #include __KERNEL_RCSID(0, "$NetBSD: weasel_pci.c,v 1.16 2016/07/07 06:55:41 msaitoh Exp $"); #include #include #include #include #include #include #include #include #include #include #include struct weasel_softc { device_t sc_dev; bus_space_tag_t sc_st; bus_space_handle_t sc_sh; struct sysmon_wdog sc_smw; int sc_wdog_armed; int sc_wdog_period; }; /* XXX */ extern int sysmon_wdog_setmode(struct sysmon_wdog *, int, u_int); static int weasel_pci_wdog_setmode(struct sysmon_wdog *); static int weasel_pci_wdog_tickle(struct sysmon_wdog *); static int weasel_wait_response(struct weasel_softc *); static int weasel_issue_command(struct weasel_softc *, uint8_t cmd); static int weasel_pci_wdog_arm(struct weasel_softc *); static int weasel_pci_wdog_disarm(struct weasel_softc *); static int weasel_pci_wdog_query_state(struct weasel_softc *); static int weasel_pci_match(device_t parent, cfdata_t cf, void *aux) { struct pci_attach_args *pa = aux; if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_MIDDLE_DIGITAL && PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_MIDDLE_DIGITAL_WEASEL_CONTROL) return (1); return (0); } static void weasel_pci_attach(device_t parent, device_t self, void *aux) { struct weasel_softc *sc = device_private(self); struct pci_attach_args *pa = aux; struct weasel_config_block cfg; const char *vers, *mode; uint8_t v, *cp; uint16_t cfg_size; uint8_t buf[8]; sc->sc_dev = self; printf(": PCI-Weasel watchdog timer\n"); if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_TYPE_MEM|PCI_MAPREG_MEM_TYPE_32BIT, 0, &sc->sc_st, &sc->sc_sh, NULL, NULL) != 0) { aprint_error_dev(self, "unable to map device registers\n"); return; } /* Ping the Weasel to see if it's alive. */ if (weasel_issue_command(sc, OS_CMD_PING)) { aprint_error_dev(self, "Weasel didn't respond to PING\n"); return; } bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); if ((v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD)) != OS_RET_PONG) { aprint_error_dev(self, "unexpected PING response from Weasel: 0x%02x\n", v); return; } /* Read the config block. */ if (weasel_issue_command(sc, OS_CMD_SHOW_CONFIG)) { aprint_error_dev(self, "Weasel didn't respond to SHOW_CONFIG\n"); return; } cfg_size = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); if (++cfg_size != sizeof(cfg)) { aprint_error_dev(self, "weird config block size from Weasel: 0x%03x\n", cfg_size); return; } for (cp = (uint8_t *) &cfg; cfg_size != 0; cfg_size--) { if (weasel_wait_response(sc)) { aprint_error_dev(self, "Weasel stopped providing config block(%d)\n", cfg_size); return; } *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); } switch (cfg.cfg_version) { case CFG_VERSION_2: vers="2"; switch (cfg.enable_duart_switching) { case 0: mode = "emulation"; break; case 1: mode = "serial"; break; case 2: mode = "autoswitch"; break; default: mode = "unknown"; } break; default: vers = mode = NULL; } if (vers != NULL) printf("%s: %s mode\n", device_xname(self), mode); else printf("%s: unknown config version 0x%02x\n", device_xname(self), cfg.cfg_version); /* * Fetch sw version. */ if (weasel_issue_command(sc, OS_CMD_QUERY_SW_VER)) { aprint_error_dev(self, "didn't reply to software version query.\n"); } else { v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); if (v>7) printf("%s: weird length for version string(%d).\n", device_xname(self), v); memset(buf, 0, sizeof(buf)); for (cp = buf; v != 0; v--) { if (weasel_wait_response(sc)) { printf("%s: Weasel stopped providing version\n", device_xname(self)); } *cp++ = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); } printf("%s: sw: %s", device_xname(self), buf); } /* * Fetch logic version. */ if (weasel_issue_command(sc, OS_CMD_QUERY_L_VER)) { aprint_normal("\n"); aprint_error_dev(self, "didn't reply to logic version query.\n"); } bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); printf(" logic: %03d", v); /* * Fetch vga bios version. */ if (weasel_issue_command(sc, OS_CMD_QUERY_VB_VER)) { aprint_normal("\n"); aprint_error_dev(self, "didn't reply to vga bios version query.\n"); } v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); printf(" vga bios: %d.%d", (v>>4), (v&0x0f)); /* * Fetch hw version. */ if (weasel_issue_command(sc, OS_CMD_QUERY_HW_VER)) { aprint_normal("\n"); aprint_error_dev(self, "didn't reply to hardware version query.\n"); } v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); printf(" hw: %d.%d", (v>>4), (v&0x0f)); printf("\n%s: break passthrough %s", device_xname(self), cfg.break_passthru ? "enabled" : "disabled"); if ((sc->sc_wdog_armed = weasel_pci_wdog_query_state(sc)) == -1) sc->sc_wdog_armed = 0; /* Weasel is big-endian */ sc->sc_wdog_period = be16toh(cfg.wdt_msec) / 1000; printf(", watchdog timer %d sec.\n", sc->sc_wdog_period); sc->sc_smw.smw_name = "weasel"; sc->sc_smw.smw_cookie = sc; sc->sc_smw.smw_setmode = weasel_pci_wdog_setmode; sc->sc_smw.smw_tickle = weasel_pci_wdog_tickle; sc->sc_smw.smw_period = sc->sc_wdog_period; if (sysmon_wdog_register(&sc->sc_smw) != 0) aprint_error_dev(self, "unable to register PC-Weasel watchdog " "with sysmon\n"); } CFATTACH_DECL_NEW(weasel_pci, sizeof(struct weasel_softc), weasel_pci_match, weasel_pci_attach, NULL, NULL); static int weasel_wait_response(struct weasel_softc *sc) { int i; for (i = 10000; i ; i--) { delay(100); if (bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS) == OS_WS_HOST_READ) return(0); } return (1); } static int weasel_issue_command(struct weasel_softc *sc, uint8_t cmd) { bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_WR, cmd); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_HOST_STATUS, OS_HS_WEASEL_READ); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); return (weasel_wait_response(sc)); } static int weasel_pci_wdog_setmode(struct sysmon_wdog *smw) { struct weasel_softc *sc = smw->smw_cookie; int error = 0; if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { error = weasel_pci_wdog_disarm(sc); } else { if (smw->smw_period == WDOG_PERIOD_DEFAULT) smw->smw_period = sc->sc_wdog_period; else if (smw->smw_period != sc->sc_wdog_period) { /* Can't change the period on the Weasel. */ return (EINVAL); } error = weasel_pci_wdog_arm(sc); weasel_pci_wdog_tickle(smw); } return (error); } static int weasel_pci_wdog_tickle(struct sysmon_wdog *smw) { struct weasel_softc *sc = smw->smw_cookie; u_int8_t reg; int x; int s; int error = 0; s = splhigh(); /* * first we tickle the watchdog */ reg = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_CHALLENGE); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_RESPONSE, ~reg); /* * then we check to make sure the weasel is still armed. If someone * has rebooted the weasel for whatever reason (firmware update), * then the watchdog timer would no longer be armed and we'd be * servicing nothing. Let the user know that the machine is no * longer being monitored by the weasel. */ if((x = weasel_pci_wdog_query_state(sc)) == -1) error = EIO; if (x == 1) { error = 0; } else { printf("%s: Watchdog timer disabled on PC/Weasel! Disarming wdog.\n", device_xname(sc->sc_dev)); sc->sc_wdog_armed = 0; sysmon_wdog_setmode(smw, WDOG_MODE_DISARMED, 0); error = 1; } splx(s); return (error); } static int weasel_pci_wdog_arm(struct weasel_softc *sc) { int x; int s; int error = 0; s = splhigh(); if (weasel_issue_command(sc, OS_CMD_WDT_ENABLE)) { printf("%s: no reply to watchdog enable. Check Weasel \"Allow Watchdog\" setting.\n", device_xname(sc->sc_dev)); error = EIO; } (void)bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); /* * Ensure that the Weasel thinks it's in the same mode we want it to * be in. EIO if not. */ x = weasel_pci_wdog_query_state(sc); switch (x) { case -1: error = EIO; break; case 0: sc->sc_wdog_armed = 0; error = EIO; break; case 1: sc->sc_wdog_armed = 1; error = 0; break; } splx(s); return(error); } static int weasel_pci_wdog_disarm(struct weasel_softc *sc) { int x; int s; int error = 0; s = splhigh(); if (weasel_issue_command(sc, OS_CMD_WDT_DISABLE)) { printf("%s: didn't reply to watchdog disable.\n", device_xname(sc->sc_dev)); error = EIO; } (void)bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); /* * Ensure that the Weasel thinks it's in the same mode we want it to * be in. EIO if not. */ x = weasel_pci_wdog_query_state(sc); switch (x) { case -1: error = EIO; break; case 0: sc->sc_wdog_armed = 0; error = 0; break; case 1: sc->sc_wdog_armed = 1; error = EIO; break; } splx(s); return(error); } static int weasel_pci_wdog_query_state(struct weasel_softc *sc) { u_int8_t v; if (weasel_issue_command(sc, OS_CMD_WDT_QUERY)) { printf("%s: didn't reply to watchdog state query.\n", device_xname(sc->sc_dev)); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); return(-1); } v = bus_space_read_1(sc->sc_st, sc->sc_sh, WEASEL_DATA_RD); bus_space_write_1(sc->sc_st, sc->sc_sh, WEASEL_STATUS, 0); return(v); }