132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/* $NetBSD: dwiic_fdt.c,v 1.1 2018/09/26 19:06:33 jakllsch Exp $ */
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/*-
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* Copyright (c) 2017 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Manuel Bouyer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Synopsys DesignWare I2C controller, FDT front-end
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: dwiic_fdt.c,v 1.1 2018/09/26 19:06:33 jakllsch Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <dev/fdt/fdtvar.h>
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#include <dev/ic/dwiic_var.h>
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static const char * const compatible[] = {
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"snps,designware-i2c",
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NULL
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};
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struct dwiic_fdt_softc {
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struct dwiic_softc sc_dwiic;
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};
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static int dwiic_fdt_match(device_t, cfdata_t, void *);
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static void dwiic_fdt_attach(device_t, device_t, void *);
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static i2c_tag_t dwiic_fdt_i2c_get_tag(device_t);
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struct fdtbus_i2c_controller_func dwiic_fdt_i2c_funcs = {
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.get_tag = dwiic_fdt_i2c_get_tag,
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};
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CFATTACH_DECL_NEW(dwiic_fdt, sizeof(struct dwiic_fdt_softc),
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dwiic_fdt_match, dwiic_fdt_attach, dwiic_detach, NULL);
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int
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dwiic_fdt_match(device_t parent, cfdata_t match, void *aux)
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{
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struct fdt_attach_args * const faa = aux;
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return of_match_compatible(faa->faa_phandle, compatible);
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}
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void
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dwiic_fdt_attach(device_t parent, device_t self, void *aux)
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{
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struct dwiic_fdt_softc * const sc = device_private(self);
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struct fdt_attach_args * const faa = aux;
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const int phandle = faa->faa_phandle;
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bus_addr_t addr;
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bus_size_t size;
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char intrstr[128];
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sc->sc_dwiic.sc_dev = self;
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sc->sc_dwiic.sc_power = NULL;
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sc->sc_dwiic.sc_type = dwiic_type_generic;
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if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
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aprint_error(": couldn't get registers\n");
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return;
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}
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sc->sc_dwiic.sc_iot = faa->faa_bst;
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if (bus_space_map(sc->sc_dwiic.sc_iot, addr, size, 0, &sc->sc_dwiic.sc_ioh) != 0) {
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aprint_error(": couldn't map registers\n");
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return;
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}
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aprint_naive(": I2C controller\n");
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aprint_normal(": I2C controller\n");
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if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
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aprint_error_dev(self, "failed to decode interrupt\n");
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return;
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}
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aprint_normal_dev(self, "interrupting on %s\n", intrstr);
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sc->sc_dwiic.sc_ih = fdtbus_intr_establish(phandle, 0, IPL_VM, 0,
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dwiic_intr, &sc->sc_dwiic);
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if (sc->sc_dwiic.sc_ih == NULL) {
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aprint_error_dev(self, "couldn't establish interrupt\n");
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goto out;
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}
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dwiic_attach(&sc->sc_dwiic);
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pmf_device_register(self, dwiic_suspend, dwiic_resume);
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fdtbus_register_i2c_controller(self, phandle, &dwiic_fdt_i2c_funcs);
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fdtbus_attach_i2cbus(self, phandle, &sc->sc_dwiic.sc_i2c_tag, iicbus_print);
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out:
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return;
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}
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static i2c_tag_t
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dwiic_fdt_i2c_get_tag(device_t dev)
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{
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struct dwiic_fdt_softc * const sc = device_private(dev);
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return &sc->sc_dwiic.sc_i2c_tag;
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}
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