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/* $OpenBSD: sfp.c,v 1.2 2020/11/10 09:19:43 kettenis Exp $ */
/*
* Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/i2c/i2cvar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_gpio.h>
#include <dev/ofw/ofw_misc.h>
struct sfp_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
int sc_node;
uint32_t *sc_mod_def0_gpio;
int sc_mod_def0_gpio_len;
struct sfp_device sc_sd;
};
int sfp_match(struct device *, void *, void *);
void sfp_attach(struct device *, struct device *, void *);
int sfp_detach(struct device *, int);
int sfp_get_gpio(struct sfp_softc *, const char *, uint32_t **);
int sfp_i2c_get_sffpage(void *, struct if_sffpage *);
struct cfattach sfp_ca = {
sizeof(struct sfp_softc), sfp_match, sfp_attach, sfp_detach,
};
struct cfdriver sfp_cd = {
NULL, "sfp", DV_DULL
};
int
sfp_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "sff,sfp") ||
OF_is_compatible(faa->fa_node, "sff,sfp+"));
}
void
sfp_attach(struct device *parent, struct device *self, void *aux)
{
struct sfp_softc *sc = (struct sfp_softc *)self;
struct fdt_attach_args *faa = aux;
sc->sc_node = faa->fa_node;
sc->sc_tag = i2c_byphandle(OF_getpropint(sc->sc_node,
"i2c-bus", 0));
if (sc->sc_tag == NULL) {
printf(": can't get i2c bus\n");
return;
}
printf("\n");
sc->sc_mod_def0_gpio_len =
sfp_get_gpio(sc, "mod-def0", &sc->sc_mod_def0_gpio);
if (sc->sc_mod_def0_gpio) {
gpio_controller_config_pin(sc->sc_mod_def0_gpio,
GPIO_CONFIG_INPUT);
}
sc->sc_sd.sd_node = faa->fa_node;
sc->sc_sd.sd_cookie = sc;
sc->sc_sd.sd_get_sffpage = sfp_i2c_get_sffpage;
sfp_register(&sc->sc_sd);
}
int
sfp_detach(struct device *self, int flags)
{
struct sfp_softc *sc = (struct sfp_softc *)self;
free(sc->sc_mod_def0_gpio, M_DEVBUF, sc->sc_mod_def0_gpio_len);
return 0;
}
int
sfp_get_gpio(struct sfp_softc *sc, const char *name, uint32_t **gpio)
{
char buf[64];
int len;
snprintf(buf, sizeof(buf), "%s-gpios", name);
len = OF_getproplen(sc->sc_node, buf);
if (len <= 0) {
snprintf(buf, sizeof(buf), "%s-gpio", name);
len = OF_getproplen(sc->sc_node, buf);
if (len <= 0)
return len;
}
*gpio = malloc(len, M_DEVBUF, M_WAITOK);
OF_getpropintarray(sc->sc_node, buf, *gpio, len);
return len;
}
int
sfp_i2c_get_sffpage(void *cookie, struct if_sffpage *sff)
{
struct sfp_softc *sc = cookie;
uint8_t reg = sff->sff_page;
if (sc->sc_mod_def0_gpio > 0) {
if (!gpio_controller_get_pin(sc->sc_mod_def0_gpio))
return ENXIO;
}
iic_acquire_bus(sc->sc_tag, 0);
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sff->sff_addr >> 1, ®, sizeof(reg),
sff->sff_data, sizeof(sff->sff_data), 0)) {
printf("%s: cannot read register 0x%x\n",
sc->sc_dev.dv_xname, reg);
}
iic_release_bus(sc->sc_tag, 0);
return 0;
}
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