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/* $NetBSD: spdmem_i2c.c,v 1.8 2013/08/07 19:38:45 soren Exp $ */
/*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spdmem_i2c.c,v 1.8 2013/08/07 19:38:45 soren Exp $");
#include <sys/param.h>
#include <sys/device.h>
#include <sys/endian.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <machine/bswap.h>
#include <dev/i2c/i2cvar.h>
#include <dev/ic/spdmemreg.h>
#include <dev/ic/spdmemvar.h>
/* Constants for matching i2c bus address */
#define SPDMEM_I2C_ADDRMASK 0x3f8
#define SPDMEM_I2C_ADDR 0x50
struct spdmem_i2c_softc {
struct spdmem_softc sc_base;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
};
static int spdmem_i2c_match(device_t, cfdata_t, void *);
static void spdmem_i2c_attach(device_t, device_t, void *);
static int spdmem_i2c_detach(device_t, int);
CFATTACH_DECL_NEW(spdmem_iic, sizeof(struct spdmem_i2c_softc),
spdmem_i2c_match, spdmem_i2c_attach, spdmem_i2c_detach, NULL);
static uint8_t spdmem_i2c_read(struct spdmem_softc *, uint8_t);
SYSCTL_SETUP_PROTO(sysctl_spdmem_setup);
static int
spdmem_i2c_match(device_t parent, cfdata_t match, void *aux)
{
struct i2c_attach_args *ia = aux;
struct spdmem_i2c_softc sc;
if (ia->ia_name) {
/* add other names as we find more firmware variations */
if (strcmp(ia->ia_name, "dimm-spd") &&
strcmp(ia->ia_name, "dimm"))
return 0;
}
/* only do this lame test when not using direct config */
if (ia->ia_name == NULL) {
if ((ia->ia_addr & SPDMEM_I2C_ADDRMASK) != SPDMEM_I2C_ADDR)
return 0;
}
sc.sc_tag = ia->ia_tag;
sc.sc_addr = ia->ia_addr;
sc.sc_base.sc_read = spdmem_i2c_read;
return spdmem_common_probe(&sc.sc_base);
}
static void
spdmem_i2c_attach(device_t parent, device_t self, void *aux)
{
struct spdmem_i2c_softc *sc = device_private(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_i2c_read;
if (!pmf_device_register(self, NULL, NULL))
aprint_error_dev(self, "couldn't establish power handler\n");
spdmem_common_attach(&sc->sc_base, self);
}
static int
spdmem_i2c_detach(device_t self, int flags)
{
struct spdmem_i2c_softc *sc = device_private(self);
pmf_device_deregister(self);
return spdmem_common_detach(&sc->sc_base, self);
}
static uint8_t
spdmem_i2c_read(struct spdmem_softc *softc, uint8_t reg)
{
uint8_t val;
struct spdmem_i2c_softc *sc = (struct spdmem_i2c_softc *)softc;
iic_acquire_bus(sc->sc_tag, 0);
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1,
&val, 1, I2C_F_POLL);
iic_release_bus(sc->sc_tag, 0);
return val;
}
MODULE(MODULE_CLASS_DRIVER, spdmem, "iic");
#ifdef _MODULE
#include "ioconf.c"
#endif
static int
spdmem_modcmd(modcmd_t cmd, void *opaque)
{
int error = 0;
#ifdef _MODULE
static struct sysctllog *spdmem_sysctl_clog;
#endif
switch (cmd) {
case MODULE_CMD_INIT:
#ifdef _MODULE
sysctl_spdmem_setup(&spdmem_sysctl_clog);
error = config_init_component(cfdriver_ioconf_spdmem,
cfattach_ioconf_spdmem, cfdata_ioconf_spdmem);
#endif
return error;
case MODULE_CMD_FINI:
#ifdef _MODULE
error = config_fini_component(cfdriver_ioconf_spdmem,
cfattach_ioconf_spdmem, cfdata_ioconf_spdmem);
sysctl_teardown(&spdmem_sysctl_clog);
#endif
return error;
default:
return ENOTTY;
}
}
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