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/* $OpenBSD: imxiic_fdt.c,v 1.2 2021/03/11 09:15:25 patrick Exp $ */
/*
* Copyright (c) 2013 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/device.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/fdt.h>
#include <dev/ic/imxiicvar.h>
struct imxiic_fdt_softc {
struct imxiic_softc fc_sc;
int fc_node;
};
int imxiic_fdt_match(struct device *, void *, void *);
void imxiic_fdt_attach(struct device *, struct device *, void *);
void imxiic_fdt_bus_scan(struct device *, struct i2cbus_attach_args *, void *);
struct cfattach imxiic_fdt_ca = {
sizeof(struct imxiic_fdt_softc), imxiic_fdt_match, imxiic_fdt_attach
};
int
imxiic_fdt_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "fsl,imx21-i2c") ||
OF_is_compatible(faa->fa_node, "fsl,vf610-i2c"));
}
void
imxiic_fdt_attach(struct device *parent, struct device *self, void *aux)
{
struct imxiic_fdt_softc *fc = (struct imxiic_fdt_softc *)self;
struct imxiic_softc *sc = &fc->fc_sc;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1)
return;
sc->sc_iot = faa->fa_iot;
sc->sc_ios = faa->fa_reg[0].size;
fc->fc_node = faa->fa_node;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh))
panic("imxiic_attach: bus_space_map failed!");
sc->sc_reg_shift = 2;
sc->sc_clk_div = imxiic_imx21_clk_div;
sc->sc_clk_ndiv = nitems(imxiic_imx21_clk_div);
sc->sc_type = I2C_TYPE_IMX21;
if (OF_is_compatible(faa->fa_node, "fsl,vf610-i2c")) {
sc->sc_reg_shift = 0;
sc->sc_clk_div = imxiic_vf610_clk_div;
sc->sc_clk_ndiv = nitems(imxiic_vf610_clk_div);
sc->sc_type = I2C_TYPE_VF610;
}
printf("\n");
clock_enable(faa->fa_node, NULL);
pinctrl_byname(faa->fa_node, "default");
/* set speed */
sc->sc_clkrate = clock_get_frequency(fc->fc_node, NULL) / 1000;
sc->sc_bitrate = OF_getpropint(fc->fc_node,
"clock-frequency", 100000) / 1000;
imxiic_setspeed(sc, sc->sc_bitrate);
/* reset */
imxiic_enable(sc, 0);
sc->stopped = 1;
rw_init(&sc->sc_buslock, sc->sc_dev.dv_xname);
struct i2cbus_attach_args iba;
sc->i2c_tag.ic_cookie = sc;
sc->i2c_tag.ic_acquire_bus = imxiic_i2c_acquire_bus;
sc->i2c_tag.ic_release_bus = imxiic_i2c_release_bus;
sc->i2c_tag.ic_exec = imxiic_i2c_exec;
bzero(&iba, sizeof iba);
iba.iba_name = "iic";
iba.iba_tag = &sc->i2c_tag;
iba.iba_bus_scan = imxiic_fdt_bus_scan;
iba.iba_bus_scan_arg = &fc->fc_node;
config_found(&sc->sc_dev, &iba, iicbus_print);
}
void
imxiic_fdt_bus_scan(struct device *self, struct i2cbus_attach_args *iba, void *aux)
{
int iba_node = *(int *)aux;
extern int iic_print(void *, const char *);
struct i2c_attach_args ia;
char name[32], status[32];
uint32_t reg[1];
int node;
for (node = OF_child(iba_node); node; node = OF_peer(node)) {
memset(name, 0, sizeof(name));
memset(status, 0, sizeof(status));
memset(reg, 0, sizeof(reg));
if (OF_getprop(node, "compatible", name, sizeof(name)) == -1)
continue;
if (name[0] == '\0')
continue;
if (OF_getprop(node, "status", status, sizeof(status)) > 0 &&
strcmp(status, "disabled") == 0)
continue;
if (OF_getprop(node, "reg", ®, sizeof(reg)) != sizeof(reg))
continue;
memset(&ia, 0, sizeof(ia));
ia.ia_tag = iba->iba_tag;
ia.ia_addr = bemtoh32(®[0]);
ia.ia_name = name;
ia.ia_cookie = &node;
config_found(self, &ia, iic_print);
}
}
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