1 /* $NetBSD: imx23timrot_fdt.c,v 1.1 2025/10/09 06:15:17 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2025 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Yuri Honegger. 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: imx23timrot_fdt.c,v 1.1 2025/10/09 06:15:17 skrll Exp $"); 34 35 #include <sys/param.h> 36 37 #include <sys/device.h> 38 39 #include <dev/fdt/fdtvar.h> 40 41 #include <arm/imx/imx23var.h> 42 #include <arm/imx/imx23_timrotvar.h> 43 #include <arm/fdt/arm_fdtvar.h> 44 45 static int imx23timrot_fdt_match(device_t, cfdata_t, void *); 46 static void imx23timrot_fdt_attach(device_t, device_t, void *); 47 48 struct imx23timrot_fdt_softc { 49 struct timrot_softc systimer_sc; 50 struct timrot_softc stattimer_sc; 51 }; 52 53 CFATTACH_DECL_NEW(imx23timrot_fdt, sizeof(struct imx23timrot_fdt_softc), 54 imx23timrot_fdt_match, imx23timrot_fdt_attach, NULL, NULL); 55 56 static const struct device_compatible_entry compat_data[] = { 57 { .compat = "fsl,imx23-timrot" }, 58 { .compat = "fsl,timrot" }, 59 DEVICE_COMPAT_EOL 60 }; 61 62 static int 63 imx23timrot_fdt_match(device_t parent, cfdata_t cf, void *aux) 64 { 65 struct fdt_attach_args * const faa = aux; 66 67 return of_compatible_match(faa->faa_phandle, compat_data); 68 } 69 70 /* 71 * The original non-FDT timrot driver instantiates one timrot device per timer. 72 * Unfortunately, the device tree from linux specifies just one timrot device 73 * for all timers. This driver therefore attaches "two" timrot devices from one. 74 */ 75 static void 76 imx23timrot_fdt_attach(device_t parent, device_t self, void *aux) 77 { 78 struct imx23timrot_fdt_softc * const sc = device_private(self); 79 struct fdt_attach_args * const faa = aux; 80 const int phandle = faa->faa_phandle; 81 char intrstr[128]; 82 83 /* 84 * The actual memory mapping is done inside the 85 * timrot_[sys|stat]timer_init functions. 86 */ 87 bus_addr_t addr; 88 bus_size_t size; 89 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 90 aprint_error(": couldn't get register address\n"); 91 return; 92 } 93 94 /* Use -1 as irq because we establish interrupts ourselves */ 95 imx23timrot_systimer_init(&sc->systimer_sc, faa->faa_bst, -1); 96 imx23timrot_stattimer_init(&sc->stattimer_sc, faa->faa_bst, -1); 97 98 99 /* System Timer Interrupt*/ 100 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 101 aprint_error(": failed to decode interrupt\n"); 102 return; 103 } 104 void *ih = fdtbus_intr_establish_xname(phandle, 0, IPL_CLOCK, 0, 105 imx23timrot_systimer_irq, NULL, 106 device_xname(self)); 107 if (ih == NULL) { 108 aprint_error_dev(self, 109 "couldn't install systimer interrupt handler\n"); 110 return; 111 } 112 aprint_normal_dev(self, ": systimer on %s", intrstr); 113 114 /* Stat Timer Interrupt*/ 115 if (!fdtbus_intr_str(phandle, 1, intrstr, sizeof(intrstr))) { 116 aprint_error(": failed to decode interrupt\n"); 117 return; 118 } 119 ih = fdtbus_intr_establish_xname(phandle, 1, IPL_CLOCK, 0, 120 imx23timrot_stattimer_irq, NULL, 121 device_xname(self)); 122 if (ih == NULL) { 123 aprint_error_dev(self, 124 "couldn't install stattimer interrupt handler\n"); 125 return; 126 } 127 aprint_normal_dev(self, ": stattimer on %s\n", intrstr); 128 129 aprint_naive("\n"); 130 aprint_normal("\n"); 131 132 struct apb_attach_args apbaa = { 133 .aa_name = "imx23timrot", 134 .aa_iot = faa->faa_bst, 135 .aa_dmat = faa->faa_dmat, 136 .aa_addr = addr, 137 .aa_size = size, 138 .aa_irq = -1 139 }; 140 141 config_found(self, &apbaa, NULL, CFARGS_NONE); 142 143 arm_fdt_timer_register(imx23timrot_cpu_initclocks); 144 } 145