1 /* $NetBSD: a9ptmr_fdt.c,v 1.1 2019/08/10 17:03:59 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson 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 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: a9ptmr_fdt.c,v 1.1 2019/08/10 17:03:59 skrll Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 38 #include <sys/device.h> 39 #include <sys/intr.h> 40 41 #include <arm/cortex/mpcore_var.h> 42 #include <arm/cortex/a9ptmr_var.h> 43 44 #include <dev/fdt/fdtvar.h> 45 #include <arm/fdt/arm_fdtvar.h> 46 47 static int a9ptmr_fdt_match(device_t, cfdata_t, void *); 48 static void a9ptmr_fdt_attach(device_t, device_t, void *); 49 50 static void a9ptmr_fdt_cpu_hatch(void *, struct cpu_info *); 51 52 struct a9ptmr_fdt_softc { 53 device_t sc_dev; 54 struct clk *sc_clk; 55 }; 56 57 CFATTACH_DECL_NEW(a9ptmr_fdt, sizeof(struct a9ptmr_fdt_softc), 58 a9ptmr_fdt_match, a9ptmr_fdt_attach, NULL, NULL); 59 60 static int 61 a9ptmr_fdt_match(device_t parent, cfdata_t cf, void *aux) 62 { 63 const char * const compatible[] = { 64 "arm,cortex-a9-twd-timer", 65 "arm,cortex-a5-twd-timer", 66 NULL 67 }; 68 struct fdt_attach_args * const faa = aux; 69 70 return of_compatible(faa->faa_phandle, compatible) >= 0; 71 } 72 73 static void 74 a9ptmr_fdt_attach(device_t parent, device_t self, void *aux) 75 { 76 struct a9ptmr_fdt_softc * const sc = device_private(self); 77 struct fdt_attach_args * const faa = aux; 78 const int phandle = faa->faa_phandle; 79 bus_space_handle_t bsh; 80 81 sc->sc_dev = self; 82 sc->sc_clk = fdtbus_clock_get_index(phandle, 0); 83 if (sc->sc_clk == NULL) { 84 aprint_error(": couldn't get clock\n"); 85 return; 86 } 87 if (clk_enable(sc->sc_clk) != 0) { 88 aprint_error(": couldn't enable clock\n"); 89 return; 90 } 91 92 uint32_t rate = clk_get_rate(sc->sc_clk); 93 prop_dictionary_t dict = device_properties(self); 94 prop_dictionary_set_uint32(dict, "frequency", rate); 95 96 char intrstr[128]; 97 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 98 aprint_error(": failed to decode interrupt\n"); 99 return; 100 } 101 102 aprint_naive("\n"); 103 aprint_normal("\n"); 104 105 void *ih = fdtbus_intr_establish(phandle, 0, IPL_CLOCK, 106 FDT_INTR_MPSAFE, a9ptmr_intr, NULL); 107 if (ih == NULL) { 108 aprint_error_dev(self, "couldn't install interrupt handler\n"); 109 return; 110 } 111 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 112 113 bus_addr_t addr; 114 bus_size_t size; 115 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 116 aprint_error(": couldn't get registers\n"); 117 return; 118 } 119 if (bus_space_map(faa->faa_bst, addr, size, 0, &bsh)) { 120 aprint_error(": couldn't map registers\n"); 121 return; 122 } 123 124 struct mpcore_attach_args mpcaa = { 125 .mpcaa_name = "arma9ptmr", 126 .mpcaa_memt = faa->faa_bst, 127 .mpcaa_memh = bsh, 128 .mpcaa_irq = -1, 129 }; 130 131 config_found(self, &mpcaa, NULL); 132 133 arm_fdt_cpu_hatch_register(self, a9ptmr_fdt_cpu_hatch); 134 arm_fdt_timer_register(a9ptmr_cpu_initclocks); 135 } 136 137 static void 138 a9ptmr_fdt_cpu_hatch(void *priv, struct cpu_info *ci) 139 { 140 a9ptmr_init_cpu_clock(ci); 141 } 142