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/* $OpenBSD: owmac.c,v 1.2 2009/04/13 21:14:41 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)
{
struct onewire_attach_args *oa = aux;
if (ONEWIRE_ROM_FAMILY_TYPE(oa->oa_rom) == ONEWIRE_FAMILY_DS1982)
return 1;
/*
* Also match on UniqueWare devices with specific 0x91 family code.
*/
if ((ONEWIRE_ROM_SN(oa->oa_rom) >> (48 - 12)) == 0x5e7 &&
ONEWIRE_ROM_FAMILY_CUSTOM(oa->oa_rom) &&
ONEWIRE_ROM_FAMILY(oa->oa_rom) == 0x91)
return 1;
return 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[8];
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]);
}
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