1 /* $NetBSD: a9ptmr_fdt.c,v 1.4 2021/04/24 23:36:26 thorpej 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 1.4 2021/04/24 23:36:26 thorpej 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 const struct device_compatible_entry compat_data[] = { 61 { .compat = "arm,cortex-a9-twd-timer" }, 62 { .compat = "arm,cortex-a5-twd-timer" }, 63 DEVICE_COMPAT_EOL 64 }; 65 66 static int 67 a9ptmr_fdt_match(device_t parent, cfdata_t cf, void *aux) 68 { 69 struct fdt_attach_args * const faa = aux; 70 71 return of_compatible_match(faa->faa_phandle, compat_data); 72 } 73 74 static void 75 a9ptmr_fdt_attach(device_t parent, device_t self, void *aux) 76 { 77 struct a9ptmr_fdt_softc * const sc = device_private(self); 78 struct fdt_attach_args * const faa = aux; 79 const int phandle = faa->faa_phandle; 80 bus_space_handle_t bsh; 81 82 sc->sc_dev = self; 83 sc->sc_clk = fdtbus_clock_get_index(phandle, 0); 84 if (sc->sc_clk == NULL) { 85 aprint_error(": couldn't get clock\n"); 86 return; 87 } 88 if (clk_enable(sc->sc_clk) != 0) { 89 aprint_error(": couldn't enable clock\n"); 90 return; 91 } 92 93 uint32_t rate = clk_get_rate(sc->sc_clk); 94 prop_dictionary_t dict = device_properties(self); 95 prop_dictionary_set_uint32(dict, "frequency", rate); 96 97 char intrstr[128]; 98 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 99 aprint_error(": failed to decode interrupt\n"); 100 return; 101 } 102 103 aprint_naive("\n"); 104 aprint_normal("\n"); 105 106 void *ih = fdtbus_intr_establish_xname(phandle, 0, IPL_CLOCK, 107 FDT_INTR_MPSAFE, a9ptmr_intr, NULL, device_xname(self)); 108 if (ih == NULL) { 109 aprint_error_dev(self, "couldn't install interrupt handler\n"); 110 return; 111 } 112 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 113 114 bus_addr_t addr; 115 bus_size_t size; 116 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 117 aprint_error(": couldn't get registers\n"); 118 return; 119 } 120 if (bus_space_map(faa->faa_bst, addr, size, 0, &bsh)) { 121 aprint_error(": couldn't map registers\n"); 122 return; 123 } 124 125 struct mpcore_attach_args mpcaa = { 126 .mpcaa_name = "arma9ptmr", 127 .mpcaa_memt = faa->faa_bst, 128 .mpcaa_memh = bsh, 129 .mpcaa_irq = -1, 130 }; 131 132 config_found(self, &mpcaa, NULL, CFARG_EOL); 133 134 arm_fdt_cpu_hatch_register(self, a9ptmr_fdt_cpu_hatch); 135 arm_fdt_timer_register(a9ptmr_cpu_initclocks); 136 } 137 138 static void 139 a9ptmr_fdt_cpu_hatch(void *priv, struct cpu_info *ci) 140 { 141 a9ptmr_init_cpu_clock(ci); 142 } 143