bcm2835_bsc_acpi.c revision 1.6
1 /* $NetBSD: bcm2835_bsc_acpi.c,v 1.6 2025/09/15 15:31:44 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 Jared McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: bcm2835_bsc_acpi.c,v 1.6 2025/09/15 15:31:44 thorpej Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/cpu.h> 35 #include <sys/device.h> 36 37 #include <dev/acpi/acpireg.h> 38 #include <dev/acpi/acpivar.h> 39 #include <dev/acpi/acpi_intr.h> 40 41 #include <arm/broadcom/bcm2835var.h> 42 #include <arm/broadcom/bcm2835_mbox.h> 43 #include <arm/broadcom/bcm2835_bscvar.h> 44 45 #include <evbarm/rpi/vcio.h> 46 #include <evbarm/rpi/vcpm.h> 47 #include <evbarm/rpi/vcprop.h> 48 49 static int bsciic_acpi_match(device_t, cfdata_t, void *); 50 static void bsciic_acpi_attach(device_t, device_t, void *); 51 52 static u_int bsciic_acpi_vpu_clock_rate(void); 53 54 CFATTACH_DECL_NEW(bsciic_acpi, sizeof(struct bsciic_softc), bsciic_acpi_match, bsciic_acpi_attach, NULL, NULL); 55 56 static const char * const compatible[] = { 57 "BCM2841", 58 NULL 59 }; 60 61 static struct { 62 struct vcprop_buffer_hdr vb_hdr; 63 struct vcprop_tag_clockrate vbt_vpuclockrate; 64 struct vcprop_tag end; 65 } vb_vpu __cacheline_aligned = { 66 .vb_hdr = { 67 .vpb_len = sizeof(vb_vpu), 68 .vpb_rcode = VCPROP_PROCESS_REQUEST 69 }, 70 .vbt_vpuclockrate = { 71 .tag = { 72 .vpt_tag = VCPROPTAG_GET_CLOCKRATE, 73 .vpt_len = VCPROPTAG_LEN(vb_vpu.vbt_vpuclockrate), 74 .vpt_rcode = VCPROPTAG_REQUEST 75 }, 76 .id = VCPROP_CLK_CORE 77 }, 78 .end = { 79 .vpt_tag = VCPROPTAG_NULL 80 } 81 }; 82 83 static int 84 bsciic_acpi_match(device_t parent, cfdata_t cf, void *aux) 85 { 86 struct acpi_attach_args *aa = aux; 87 88 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 89 return 0; 90 91 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 92 } 93 94 static void 95 bsciic_acpi_attach(device_t parent, device_t self, void *aux) 96 { 97 struct bsciic_softc * const sc = device_private(self); 98 struct acpi_attach_args *aa = aux; 99 struct acpi_resources res; 100 struct acpi_mem *mem; 101 struct acpi_irq *irq; 102 ACPI_STATUS rv; 103 ACPI_INTEGER clock_freq; 104 void *ih; 105 106 sc->sc_dev = self; 107 108 rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS", 109 &res, &acpi_resource_parse_ops_default); 110 if (ACPI_FAILURE(rv)) 111 return; 112 113 mem = acpi_res_mem(&res, 0); 114 if (mem == NULL) { 115 aprint_error_dev(self, "couldn't find mem resource\n"); 116 goto done; 117 } 118 119 irq = acpi_res_irq(&res, 0); 120 if (irq == NULL) { 121 aprint_error_dev(self, "couldn't find irq resource\n"); 122 goto done; 123 } 124 125 sc->sc_dev = self; 126 sc->sc_iot = aa->aa_memt; 127 if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, &sc->sc_ioh) != 0) { 128 aprint_error_dev(self, "couldn't map registers\n"); 129 goto done; 130 } 131 132 sc->sc_frequency = bsciic_acpi_vpu_clock_rate(); 133 if (sc->sc_frequency == 0) { 134 aprint_error_dev(self, "couldn't determine parent clock rate\n"); 135 goto done; 136 } 137 138 rv = acpi_dsd_integer(aa->aa_node->ad_handle, "clock-frequency", &clock_freq); 139 if (ACPI_SUCCESS(rv)) 140 sc->sc_clkrate = clock_freq; 141 else 142 sc->sc_clkrate = 100000; 143 144 bsciic_attach(sc); 145 146 ih = acpi_intr_establish(self, (uint64_t)aa->aa_node->ad_handle, 147 IPL_VM, true, bsciic_intr, sc, device_xname(self)); 148 if (ih == NULL) { 149 aprint_error_dev(self, "couldn't install interrupt handler\n"); 150 goto done; 151 } 152 153 iic_tag_init(&sc->sc_i2c); 154 sc->sc_i2c.ic_cookie = sc; 155 sc->sc_i2c.ic_acquire_bus = bsciic_acquire_bus; 156 sc->sc_i2c.ic_release_bus = bsciic_release_bus; 157 sc->sc_i2c.ic_exec = bsciic_exec; 158 159 iicbus_attach(self, &sc->sc_i2c); 160 161 done: 162 acpi_resource_cleanup(&res); 163 } 164 165 static u_int 166 bsciic_acpi_vpu_clock_rate(void) 167 { 168 uint32_t res; 169 int error; 170 171 error = bcmmbox_request(BCMMBOX_CHANARM2VC, &vb_vpu, 172 sizeof(vb_vpu), &res); 173 if (error != 0) { 174 printf("%s: mbox request failed (%d)\n", __func__, error); 175 return 0; 176 } 177 178 if (!vcprop_buffer_success_p(&vb_vpu.vb_hdr) || 179 !vcprop_tag_success_p(&vb_vpu.vbt_vpuclockrate.tag) || 180 vb_vpu.vbt_vpuclockrate.rate < 0) 181 return 0; 182 183 return vb_vpu.vbt_vpuclockrate.rate; 184 } 185
Indexes created Mon Sep 29 21:09:56 GMT 2025