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