bcm2835_bsc_fdt.c revision 1.1.2.2
1 1.1.2.2 martin /* $NetBSD: bcm2835_bsc_fdt.c,v 1.1.2.2 2020/04/08 14:07:28 martin Exp $ */ 2 1.1.2.2 martin 3 1.1.2.2 martin /* 4 1.1.2.2 martin * Copyright (c) 2019 Jason R. Thorpe 5 1.1.2.2 martin * Copyright (c) 2012 Jonathan A. Kollasch 6 1.1.2.2 martin * All rights reserved. 7 1.1.2.2 martin * 8 1.1.2.2 martin * Redistribution and use in source and binary forms, with or without 9 1.1.2.2 martin * modification, are permitted provided that the following conditions 10 1.1.2.2 martin * are met: 11 1.1.2.2 martin * 1. Redistributions of source code must retain the above copyright 12 1.1.2.2 martin * notice, this list of conditions and the following disclaimer. 13 1.1.2.2 martin * 2. Redistributions in binary form must reproduce the above copyright 14 1.1.2.2 martin * notice, this list of conditions and the following disclaimer in the 15 1.1.2.2 martin * documentation and/or other materials provided with the distribution. 16 1.1.2.2 martin * 17 1.1.2.2 martin * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 1.1.2.2 martin * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 1.1.2.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 1.1.2.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 21 1.1.2.2 martin * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 1.1.2.2 martin * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 1.1.2.2 martin * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 1.1.2.2 martin * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 1.1.2.2 martin * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 1.1.2.2 martin * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 1.1.2.2 martin * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 1.1.2.2 martin */ 29 1.1.2.2 martin 30 1.1.2.2 martin #include <sys/cdefs.h> 31 1.1.2.2 martin __KERNEL_RCSID(0, "$NetBSD: bcm2835_bsc_fdt.c,v 1.1.2.2 2020/04/08 14:07:28 martin Exp $"); 32 1.1.2.2 martin 33 1.1.2.2 martin #include <sys/param.h> 34 1.1.2.2 martin #include <sys/bus.h> 35 1.1.2.2 martin #include <sys/device.h> 36 1.1.2.2 martin #include <sys/kernhist.h> 37 1.1.2.2 martin #include <sys/intr.h> 38 1.1.2.2 martin #include <sys/mutex.h> 39 1.1.2.2 martin #include <sys/systm.h> 40 1.1.2.2 martin 41 1.1.2.2 martin #include <dev/i2c/i2cvar.h> 42 1.1.2.2 martin 43 1.1.2.2 martin #include <arm/broadcom/bcm2835reg.h> 44 1.1.2.2 martin #include <arm/broadcom/bcm2835_bscreg.h> 45 1.1.2.2 martin #include <arm/broadcom/bcm2835_bscvar.h> 46 1.1.2.2 martin 47 1.1.2.2 martin #include <dev/fdt/fdtvar.h> 48 1.1.2.2 martin 49 1.1.2.2 martin static int bsciic_fdt_match(device_t, cfdata_t, void *); 50 1.1.2.2 martin static void bsciic_fdt_attach(device_t, device_t, void *); 51 1.1.2.2 martin 52 1.1.2.2 martin CFATTACH_DECL_NEW(bsciic_fdt, sizeof(struct bsciic_softc), 53 1.1.2.2 martin bsciic_fdt_match, bsciic_fdt_attach, NULL, NULL); 54 1.1.2.2 martin 55 1.1.2.2 martin static int 56 1.1.2.2 martin bsciic_fdt_match(device_t parent, cfdata_t match, void *aux) 57 1.1.2.2 martin { 58 1.1.2.2 martin const char * const compatible[] = { "brcm,bcm2835-i2c", NULL }; 59 1.1.2.2 martin struct fdt_attach_args * const faa = aux; 60 1.1.2.2 martin 61 1.1.2.2 martin return of_match_compatible(faa->faa_phandle, compatible); 62 1.1.2.2 martin } 63 1.1.2.2 martin 64 1.1.2.2 martin static void 65 1.1.2.2 martin bsciic_fdt_attach(device_t parent, device_t self, void *aux) 66 1.1.2.2 martin { 67 1.1.2.2 martin struct bsciic_softc * const sc = device_private(self); 68 1.1.2.2 martin struct fdt_attach_args * const faa = aux; 69 1.1.2.2 martin const int phandle = faa->faa_phandle; 70 1.1.2.2 martin prop_dictionary_t prop = device_properties(self); 71 1.1.2.2 martin bool disable = false; 72 1.1.2.2 martin 73 1.1.2.2 martin bus_addr_t addr; 74 1.1.2.2 martin bus_size_t size; 75 1.1.2.2 martin 76 1.1.2.2 martin sc->sc_dev = self; 77 1.1.2.2 martin sc->sc_iot = faa->faa_bst; 78 1.1.2.2 martin 79 1.1.2.2 martin int error = fdtbus_get_reg(phandle, 0, &addr, &size); 80 1.1.2.2 martin if (error) { 81 1.1.2.2 martin aprint_error(": unable to get device registers\n"); 82 1.1.2.2 martin return; 83 1.1.2.2 martin } 84 1.1.2.2 martin 85 1.1.2.2 martin prop_dictionary_get_bool(prop, "disable", &disable); 86 1.1.2.2 martin if (disable) { 87 1.1.2.2 martin aprint_naive(": disabled\n"); 88 1.1.2.2 martin aprint_normal(": disabled\n"); 89 1.1.2.2 martin return; 90 1.1.2.2 martin } 91 1.1.2.2 martin 92 1.1.2.2 martin /* Enable clock */ 93 1.1.2.2 martin sc->sc_clk = fdtbus_clock_get_index(phandle, 0); 94 1.1.2.2 martin if (sc->sc_clk == NULL) { 95 1.1.2.2 martin aprint_error(": couldn't acquire clock\n"); 96 1.1.2.2 martin return; 97 1.1.2.2 martin } 98 1.1.2.2 martin 99 1.1.2.2 martin if (clk_enable(sc->sc_clk) != 0) { 100 1.1.2.2 martin aprint_error(": failed to enable clock\n"); 101 1.1.2.2 martin return; 102 1.1.2.2 martin } 103 1.1.2.2 martin 104 1.1.2.2 martin sc->sc_frequency = clk_get_rate(sc->sc_clk); 105 1.1.2.2 martin 106 1.1.2.2 martin if (of_getprop_uint32(phandle, "clock-frequency", 107 1.1.2.2 martin &sc->sc_clkrate) != 0) { 108 1.1.2.2 martin sc->sc_clkrate = 100000; 109 1.1.2.2 martin } 110 1.1.2.2 martin 111 1.1.2.2 martin if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) { 112 1.1.2.2 martin aprint_error(": unable to map device\n"); 113 1.1.2.2 martin return; 114 1.1.2.2 martin } 115 1.1.2.2 martin 116 1.1.2.2 martin aprint_naive("\n"); 117 1.1.2.2 martin aprint_normal(": Broadcom Serial Controller\n"); 118 1.1.2.2 martin 119 1.1.2.2 martin bsciic_attach(sc); 120 1.1.2.2 martin 121 1.1.2.2 martin char intrstr[128]; 122 1.1.2.2 martin if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 123 1.1.2.2 martin aprint_error_dev(sc->sc_dev, "failed to decode interrupt\n"); 124 1.1.2.2 martin return; 125 1.1.2.2 martin } 126 1.1.2.2 martin sc->sc_inth = fdtbus_intr_establish(phandle, 0, IPL_VM, 127 1.1.2.2 martin FDT_INTR_MPSAFE, bsciic_intr, sc); 128 1.1.2.2 martin if (sc->sc_inth == NULL) { 129 1.1.2.2 martin aprint_error_dev(sc->sc_dev, 130 1.1.2.2 martin "failed to establish interrupt %s\n", intrstr); 131 1.1.2.2 martin return; 132 1.1.2.2 martin } 133 1.1.2.2 martin aprint_normal_dev(sc->sc_dev, "interrupting on %s\n", intrstr); 134 1.1.2.2 martin 135 1.1.2.2 martin iic_tag_init(&sc->sc_i2c); 136 1.1.2.2 martin sc->sc_i2c.ic_cookie = sc; 137 1.1.2.2 martin sc->sc_i2c.ic_acquire_bus = bsciic_acquire_bus; 138 1.1.2.2 martin sc->sc_i2c.ic_release_bus = bsciic_release_bus; 139 1.1.2.2 martin sc->sc_i2c.ic_exec = bsciic_exec; 140 1.1.2.2 martin 141 1.1.2.2 martin fdtbus_attach_i2cbus(self, phandle, &sc->sc_i2c, iicbus_print); 142 1.1.2.2 martin } 143
Indexes created Thu Oct 30 16:09:53 GMT 2025