123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/* $OpenBSD: spdmem_i2c.c,v 1.2 2022/04/06 18:59:28 naddy Exp $ */
|
|
/* $NetBSD: spdmem.c,v 1.3 2007/09/20 23:09:59 xtraeme Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2007 Jonathan Gray <jsg@openbsd.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2007 Nicolas Joly
|
|
* Copyright (c) 2007 Paul Goyette
|
|
* Copyright (c) 2007 Tobias Nygren
|
|
* 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.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* 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 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.
|
|
*/
|
|
|
|
/*
|
|
* Serial Presence Detect (SPD) memory identification
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/device.h>
|
|
|
|
#include <dev/spdmemvar.h>
|
|
#include <dev/i2c/i2cvar.h>
|
|
|
|
struct spdmem_iic_softc {
|
|
struct spdmem_softc sc_base;
|
|
i2c_tag_t sc_tag;
|
|
i2c_addr_t sc_addr;
|
|
};
|
|
|
|
int spdmem_iic_match(struct device *, void *, void *);
|
|
void spdmem_iic_attach(struct device *, struct device *, void *);
|
|
uint8_t spdmem_iic_read(struct spdmem_softc *, uint8_t);
|
|
|
|
const struct cfattach spdmem_iic_ca = {
|
|
sizeof(struct spdmem_iic_softc), spdmem_iic_match, spdmem_iic_attach
|
|
};
|
|
|
|
int
|
|
spdmem_iic_match(struct device *parent, void *match, void *aux)
|
|
{
|
|
struct i2c_attach_args *ia = aux;
|
|
struct spdmem_iic_softc sc;
|
|
|
|
/* clever attachments like openfirmware informed macppc */
|
|
if (strcmp(ia->ia_name, "spd") == 0)
|
|
return (1);
|
|
|
|
/* dumb, need sanity checks */
|
|
if (strcmp(ia->ia_name, "eeprom") != 0)
|
|
return (0);
|
|
|
|
sc.sc_tag = ia->ia_tag;
|
|
sc.sc_addr = ia->ia_addr;
|
|
sc.sc_base.sc_read = spdmem_iic_read;
|
|
|
|
return spdmem_probe(&sc.sc_base);
|
|
}
|
|
|
|
void
|
|
spdmem_iic_attach(struct device *parent, struct device *self, void *aux)
|
|
{
|
|
struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)self;
|
|
struct i2c_attach_args *ia = aux;
|
|
|
|
sc->sc_tag = ia->ia_tag;
|
|
sc->sc_addr = ia->ia_addr;
|
|
sc->sc_base.sc_read = spdmem_iic_read;
|
|
|
|
printf(":");
|
|
|
|
spdmem_attach_common(&sc->sc_base);
|
|
}
|
|
|
|
uint8_t
|
|
spdmem_iic_read(struct spdmem_softc *v, uint8_t reg)
|
|
{
|
|
struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)v;
|
|
uint8_t val = 0xff;
|
|
|
|
iic_acquire_bus(sc->sc_tag,0);
|
|
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
|
|
®, sizeof reg, &val, sizeof val, 0);
|
|
iic_release_bus(sc->sc_tag, 0);
|
|
|
|
return val;
|
|
}
|