diff options
Diffstat (limited to 'sys/arch/sgi/dev/owmac.c')
| -rw-r--r-- | sys/arch/sgi/dev/owmac.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/sys/arch/sgi/dev/owmac.c b/sys/arch/sgi/dev/owmac.c new file mode 100644 index 00000000000..c178a3591aa --- /dev/null +++ b/sys/arch/sgi/dev/owmac.c @@ -0,0 +1,186 @@ +/* $OpenBSD: owmac.c,v 1.1 2008/04/07 22:55:57 miod Exp $ */ + +/* + * Copyright (c) 2008 Miodrag Vallat. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * DS1981/1982/2502 1-Wire Add-only memory driver, for SGI machines. + * + * SGI uses DS1981 (or compatibles) to store the Ethernet address + * on IOC boards. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/device.h> +#include <sys/kernel.h> +#include <sys/proc.h> + +#include <dev/onewire/onewiredevs.h> +#include <dev/onewire/onewirereg.h> +#include <dev/onewire/onewirevar.h> + +#include <sgi/dev/owmem_subr.h> +#include <sgi/dev/owmacvar.h> + +int owmac_match(struct device *, void *, void *); +void owmac_attach(struct device *, struct device *, void *); + +struct cfattach owmac_ca = { + sizeof(struct owmac_softc), owmac_match, owmac_attach, +}; + +struct cfdriver owmac_cd = { + NULL, "owmac", DV_DULL +}; + +#define EEPROM_NPAGES 4 + +static const struct onewire_matchfam owmac_fams[] = { + { ONEWIRE_FAMILY_DS1982 } +}; + +int owmac_read_page(struct owmac_softc *, int, uint8_t *); +int owmac_read_redirect(struct owmac_softc *); + +void owmac_read_mac(struct owmac_softc *); + +int +owmac_match(struct device *parent, void *match, void *aux) +{ + return (onewire_matchbyfam(aux, owmac_fams, + sizeof(owmac_fams) /sizeof(owmac_fams[0]))); +} + +void +owmac_attach(struct device *parent, struct device *self, void *aux) +{ + struct owmac_softc *sc = (struct owmac_softc *)self; + struct onewire_attach_args *oa = aux; + + sc->sc_onewire = oa->oa_onewire; + sc->sc_rom = oa->oa_rom; + + /* + * Read the redirection table. + */ + if (owmac_read_redirect(sc) != 0) { + printf(": unable to read redirection data\n"); + return; + } + + printf("\n"); + + /* + * Read the data. + */ + owmac_read_mac(sc); +} + +int +owmac_read_redirect(struct owmac_softc *sc) +{ + int rc = 0; + int status_offset; + + status_offset = 0x0001; /* 1..4 */ + + onewire_lock(sc->sc_onewire, 0); + if ((rc = onewire_reset(sc->sc_onewire)) != 0) + goto unlock; + + onewire_matchrom(sc->sc_onewire, sc->sc_rom); + + /* + * Start reading the EEPROM status block, at the page redirection + * offset. + */ + onewire_write_byte(sc->sc_onewire, ONEWIRE_CMD_READ_STATUS); + onewire_write_byte(sc->sc_onewire, status_offset & 0xff); + onewire_write_byte(sc->sc_onewire, status_offset >> 8); + /* XXX should verify this crc value */ + (void)onewire_read_byte(sc->sc_onewire); + + onewire_read_block(sc->sc_onewire, &sc->sc_redir, EEPROM_NPAGES); + + onewire_reset(sc->sc_onewire); +unlock: + onewire_unlock(sc->sc_onewire); + + return rc; +} + +int +owmac_read_page(struct owmac_softc *sc, int page, uint8_t *buf) +{ + int rc = 0; + int pg; + + /* + * Follow the redirection information. + */ + if ((pg = owmem_redirect(sc->sc_redir, EEPROM_NPAGES, page)) < 0) + return EINVAL; + + pg = page * EEPROM_PAGE_SIZE; + + onewire_lock(sc->sc_onewire, 0); + if ((rc = onewire_reset(sc->sc_onewire)) != 0) + goto unlock; + + onewire_matchrom(sc->sc_onewire, sc->sc_rom); + + /* + * Start reading the EEPROM data. + */ + onewire_write_byte(sc->sc_onewire, ONEWIRE_CMD_READ_MEMORY); + onewire_write_byte(sc->sc_onewire, pg & 0xff); + onewire_write_byte(sc->sc_onewire, 0); + /* XXX should verify this crc value */ + (void)onewire_read_byte(sc->sc_onewire); + + onewire_read_block(sc->sc_onewire, buf, EEPROM_PAGE_SIZE); + + onewire_reset(sc->sc_onewire); +unlock: + onewire_unlock(sc->sc_onewire); + + return rc; +} + +void +owmac_read_mac(struct owmac_softc *sc) +{ + uint8_t buf[EEPROM_PAGE_SIZE]; + + if (owmac_read_page(sc, 0, buf) != 0) + return; + + if (buf[0] != 0x0a) + return; + + sc->sc_enaddr[0] = buf[10]; + sc->sc_enaddr[1] = buf[9]; + sc->sc_enaddr[2] = buf[0]; + sc->sc_enaddr[3] = buf[7]; + sc->sc_enaddr[4] = buf[6]; + sc->sc_enaddr[5] = buf[5]; + + printf("%s: Ethernet Address %02x:%02x:%02x:%02x:%02x:%02x\n", + sc->sc_dev.dv_xname, + sc->sc_enaddr[0], sc->sc_enaddr[1], sc->sc_enaddr[2], + sc->sc_enaddr[3], sc->sc_enaddr[4], sc->sc_enaddr[5]); +} |