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dwiic_fdt.c revision 1.1
      1 /* $NetBSD: dwiic_fdt.c,v 1.1 2018/09/26 19:06:33 jakllsch Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Manuel Bouyer.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 /*
     32  * Synopsys DesignWare I2C controller, FDT front-end
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: dwiic_fdt.c,v 1.1 2018/09/26 19:06:33 jakllsch Exp $");
     37 
     38 #include <sys/param.h>
     39 #include <sys/systm.h>
     40 
     41 #include <dev/fdt/fdtvar.h>
     42 #include <dev/ic/dwiic_var.h>
     43 
     44 static const char * const compatible[] = {
     45 	"snps,designware-i2c",
     46 	NULL
     47 };
     48 
     49 struct dwiic_fdt_softc {
     50 	struct dwiic_softc	sc_dwiic;
     51 };
     52 
     53 static int	dwiic_fdt_match(device_t, cfdata_t, void *);
     54 static void	dwiic_fdt_attach(device_t, device_t, void *);
     55 static i2c_tag_t dwiic_fdt_i2c_get_tag(device_t);
     56 
     57 struct fdtbus_i2c_controller_func dwiic_fdt_i2c_funcs = {
     58 	.get_tag = dwiic_fdt_i2c_get_tag,
     59 };
     60 
     61 CFATTACH_DECL_NEW(dwiic_fdt, sizeof(struct dwiic_fdt_softc),
     62     dwiic_fdt_match, dwiic_fdt_attach, dwiic_detach, NULL);
     63 
     64 int
     65 dwiic_fdt_match(device_t parent, cfdata_t match, void *aux)
     66 {
     67 	struct fdt_attach_args * const faa = aux;
     68 
     69 	return of_match_compatible(faa->faa_phandle, compatible);
     70 }
     71 
     72 void
     73 dwiic_fdt_attach(device_t parent, device_t self, void *aux)
     74 {
     75 	struct dwiic_fdt_softc * const sc = device_private(self);
     76 	struct fdt_attach_args * const faa = aux;
     77 	const int phandle = faa->faa_phandle;
     78 	bus_addr_t addr;
     79 	bus_size_t size;
     80 	char intrstr[128];
     81 
     82 	sc->sc_dwiic.sc_dev = self;
     83 	sc->sc_dwiic.sc_power = NULL;
     84 	sc->sc_dwiic.sc_type = dwiic_type_generic;
     85 
     86 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     87 		aprint_error(": couldn't get registers\n");
     88 		return;
     89 	}
     90 
     91 	sc->sc_dwiic.sc_iot = faa->faa_bst;
     92 	if (bus_space_map(sc->sc_dwiic.sc_iot, addr, size, 0, &sc->sc_dwiic.sc_ioh) != 0) {
     93 		aprint_error(": couldn't map registers\n");
     94 		return;
     95 	}
     96 
     97 	aprint_naive(": I2C controller\n");
     98 	aprint_normal(": I2C controller\n");
     99 
    100 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
    101 		aprint_error_dev(self, "failed to decode interrupt\n");
    102 		return;
    103 	}
    104 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    105 
    106 	sc->sc_dwiic.sc_ih = fdtbus_intr_establish(phandle, 0, IPL_VM, 0,
    107 		dwiic_intr, &sc->sc_dwiic);
    108 	if (sc->sc_dwiic.sc_ih == NULL) {
    109 		aprint_error_dev(self, "couldn't establish interrupt\n");
    110 		goto out;
    111 	}
    112 
    113 	dwiic_attach(&sc->sc_dwiic);
    114 
    115 	pmf_device_register(self, dwiic_suspend, dwiic_resume);
    116 
    117 	fdtbus_register_i2c_controller(self, phandle, &dwiic_fdt_i2c_funcs);
    118 
    119 	fdtbus_attach_i2cbus(self, phandle, &sc->sc_dwiic.sc_i2c_tag, iicbus_print);
    120 
    121 out:
    122 	return;
    123 }
    124 
    125 static i2c_tag_t
    126 dwiic_fdt_i2c_get_tag(device_t dev)
    127 {
    128 	struct dwiic_fdt_softc * const sc = device_private(dev);
    129 
    130 	return &sc->sc_dwiic.sc_i2c_tag;
    131 }
    132