1 /* $NetBSD: bcm2835_bsc_fdt.c,v 1.2 2020/05/31 23:52:19 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2019 Jason R. Thorpe 5 * Copyright (c) 2012 Jonathan A. Kollasch 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: bcm2835_bsc_fdt.c,v 1.2 2020/05/31 23:52:19 thorpej Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/device.h> 36 #include <sys/kernhist.h> 37 #include <sys/intr.h> 38 #include <sys/mutex.h> 39 #include <sys/systm.h> 40 41 #include <dev/i2c/i2cvar.h> 42 43 #include <arm/broadcom/bcm2835reg.h> 44 #include <arm/broadcom/bcm2835_bscreg.h> 45 #include <arm/broadcom/bcm2835_bscvar.h> 46 47 #include <dev/fdt/fdtvar.h> 48 49 static int bsciic_fdt_match(device_t, cfdata_t, void *); 50 static void bsciic_fdt_attach(device_t, device_t, void *); 51 52 CFATTACH_DECL_NEW(bsciic_fdt, sizeof(struct bsciic_softc), 53 bsciic_fdt_match, bsciic_fdt_attach, NULL, NULL); 54 55 static int 56 bsciic_fdt_match(device_t parent, cfdata_t match, void *aux) 57 { 58 const char * const compatible[] = { "brcm,bcm2835-i2c", NULL }; 59 struct fdt_attach_args * const faa = aux; 60 61 return of_match_compatible(faa->faa_phandle, compatible); 62 } 63 64 static void 65 bsciic_fdt_attach(device_t parent, device_t self, void *aux) 66 { 67 struct bsciic_softc * const sc = device_private(self); 68 struct fdt_attach_args * const faa = aux; 69 const int phandle = faa->faa_phandle; 70 71 bus_addr_t addr; 72 bus_size_t size; 73 74 sc->sc_dev = self; 75 sc->sc_iot = faa->faa_bst; 76 77 int error = fdtbus_get_reg(phandle, 0, &addr, &size); 78 if (error) { 79 aprint_error(": unable to get device registers\n"); 80 return; 81 } 82 83 /* Enable clock */ 84 sc->sc_clk = fdtbus_clock_get_index(phandle, 0); 85 if (sc->sc_clk == NULL) { 86 aprint_error(": couldn't acquire clock\n"); 87 return; 88 } 89 90 if (clk_enable(sc->sc_clk) != 0) { 91 aprint_error(": failed to enable clock\n"); 92 return; 93 } 94 95 sc->sc_frequency = clk_get_rate(sc->sc_clk); 96 97 if (of_getprop_uint32(phandle, "clock-frequency", 98 &sc->sc_clkrate) != 0) { 99 sc->sc_clkrate = 100000; 100 } 101 102 if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) { 103 aprint_error(": unable to map device\n"); 104 return; 105 } 106 107 aprint_naive("\n"); 108 aprint_normal(": Broadcom Serial Controller\n"); 109 110 bsciic_attach(sc); 111 112 char intrstr[128]; 113 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 114 aprint_error_dev(sc->sc_dev, "failed to decode interrupt\n"); 115 return; 116 } 117 sc->sc_inth = fdtbus_intr_establish(phandle, 0, IPL_VM, 118 FDT_INTR_MPSAFE, bsciic_intr, sc); 119 if (sc->sc_inth == NULL) { 120 aprint_error_dev(sc->sc_dev, 121 "failed to establish interrupt %s\n", intrstr); 122 return; 123 } 124 aprint_normal_dev(sc->sc_dev, "interrupting on %s\n", intrstr); 125 126 iic_tag_init(&sc->sc_i2c); 127 sc->sc_i2c.ic_cookie = sc; 128 sc->sc_i2c.ic_acquire_bus = bsciic_acquire_bus; 129 sc->sc_i2c.ic_release_bus = bsciic_release_bus; 130 sc->sc_i2c.ic_exec = bsciic_exec; 131 132 fdtbus_attach_i2cbus(self, phandle, &sc->sc_i2c, iicbus_print); 133 } 134