bcm2835_bsc_acpi.c revision 1.1.2.2
1 1.1.2.2 martin /* $NetBSD: bcm2835_bsc_acpi.c,v 1.1.2.2 2020/04/08 14:07:28 martin Exp $ */ 2 1.1.2.2 martin 3 1.1.2.2 martin /*- 4 1.1.2.2 martin * Copyright (c) 2020 Jared McNeill <jmcneill (at) invisible.ca> 5 1.1.2.2 martin * All rights reserved. 6 1.1.2.2 martin * 7 1.1.2.2 martin * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 martin * modification, are permitted provided that the following conditions 9 1.1.2.2 martin * are met: 10 1.1.2.2 martin * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 martin * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 martin * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 martin * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 martin * documentation and/or other materials provided with the distribution. 15 1.1.2.2 martin * 16 1.1.2.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.1.2.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.1.2.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.1.2.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.1.2.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.1.2.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.1.2.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.1.2.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.1.2.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.1.2.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.1.2.2 martin * POSSIBILITY OF SUCH DAMAGE. 27 1.1.2.2 martin */ 28 1.1.2.2 martin 29 1.1.2.2 martin #include <sys/cdefs.h> 30 1.1.2.2 martin __KERNEL_RCSID(0, "$NetBSD: bcm2835_bsc_acpi.c,v 1.1.2.2 2020/04/08 14:07:28 martin Exp $"); 31 1.1.2.2 martin 32 1.1.2.2 martin #include <sys/param.h> 33 1.1.2.2 martin #include <sys/bus.h> 34 1.1.2.2 martin #include <sys/cpu.h> 35 1.1.2.2 martin #include <sys/device.h> 36 1.1.2.2 martin 37 1.1.2.2 martin #include <dev/acpi/acpireg.h> 38 1.1.2.2 martin #include <dev/acpi/acpivar.h> 39 1.1.2.2 martin #include <dev/acpi/acpi_intr.h> 40 1.1.2.2 martin #include <dev/acpi/acpi_i2c.h> 41 1.1.2.2 martin 42 1.1.2.2 martin #include <arm/broadcom/bcm2835var.h> 43 1.1.2.2 martin #include <arm/broadcom/bcm2835_mbox.h> 44 1.1.2.2 martin #include <arm/broadcom/bcm2835_bscvar.h> 45 1.1.2.2 martin 46 1.1.2.2 martin #include <evbarm/rpi/vcio.h> 47 1.1.2.2 martin #include <evbarm/rpi/vcpm.h> 48 1.1.2.2 martin #include <evbarm/rpi/vcprop.h> 49 1.1.2.2 martin 50 1.1.2.2 martin static int bsciic_acpi_match(device_t, cfdata_t, void *); 51 1.1.2.2 martin static void bsciic_acpi_attach(device_t, device_t, void *); 52 1.1.2.2 martin 53 1.1.2.2 martin static u_int bsciic_acpi_vpu_clock_rate(void); 54 1.1.2.2 martin 55 1.1.2.2 martin CFATTACH_DECL_NEW(bsciic_acpi, sizeof(struct bsciic_softc), bsciic_acpi_match, bsciic_acpi_attach, NULL, NULL); 56 1.1.2.2 martin 57 1.1.2.2 martin static const char * const compatible[] = { 58 1.1.2.2 martin "BCM2841", 59 1.1.2.2 martin NULL 60 1.1.2.2 martin }; 61 1.1.2.2 martin 62 1.1.2.2 martin static struct { 63 1.1.2.2 martin struct vcprop_buffer_hdr vb_hdr; 64 1.1.2.2 martin struct vcprop_tag_clockrate vbt_vpuclockrate; 65 1.1.2.2 martin struct vcprop_tag end; 66 1.1.2.2 martin } vb_vpu __cacheline_aligned = { 67 1.1.2.2 martin .vb_hdr = { 68 1.1.2.2 martin .vpb_len = sizeof(vb_vpu), 69 1.1.2.2 martin .vpb_rcode = VCPROP_PROCESS_REQUEST 70 1.1.2.2 martin }, 71 1.1.2.2 martin .vbt_vpuclockrate = { 72 1.1.2.2 martin .tag = { 73 1.1.2.2 martin .vpt_tag = VCPROPTAG_GET_CLOCKRATE, 74 1.1.2.2 martin .vpt_len = VCPROPTAG_LEN(vb_vpu.vbt_vpuclockrate), 75 1.1.2.2 martin .vpt_rcode = VCPROPTAG_REQUEST 76 1.1.2.2 martin }, 77 1.1.2.2 martin .id = VCPROP_CLK_CORE 78 1.1.2.2 martin }, 79 1.1.2.2 martin .end = { 80 1.1.2.2 martin .vpt_tag = VCPROPTAG_NULL 81 1.1.2.2 martin } 82 1.1.2.2 martin }; 83 1.1.2.2 martin 84 1.1.2.2 martin static int 85 1.1.2.2 martin bsciic_acpi_match(device_t parent, cfdata_t cf, void *aux) 86 1.1.2.2 martin { 87 1.1.2.2 martin struct acpi_attach_args *aa = aux; 88 1.1.2.2 martin 89 1.1.2.2 martin if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 90 1.1.2.2 martin return 0; 91 1.1.2.2 martin 92 1.1.2.2 martin return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 93 1.1.2.2 martin } 94 1.1.2.2 martin 95 1.1.2.2 martin static void 96 1.1.2.2 martin bsciic_acpi_attach(device_t parent, device_t self, void *aux) 97 1.1.2.2 martin { 98 1.1.2.2 martin struct bsciic_softc * const sc = device_private(self); 99 1.1.2.2 martin struct acpi_attach_args *aa = aux; 100 1.1.2.2 martin struct i2cbus_attach_args iba; 101 1.1.2.2 martin struct acpi_resources res; 102 1.1.2.2 martin struct acpi_mem *mem; 103 1.1.2.2 martin struct acpi_irq *irq; 104 1.1.2.2 martin ACPI_STATUS rv; 105 1.1.2.2 martin ACPI_INTEGER clock_freq; 106 1.1.2.2 martin void *ih; 107 1.1.2.2 martin 108 1.1.2.2 martin sc->sc_dev = self; 109 1.1.2.2 martin 110 1.1.2.2 martin rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS", 111 1.1.2.2 martin &res, &acpi_resource_parse_ops_default); 112 1.1.2.2 martin if (ACPI_FAILURE(rv)) 113 1.1.2.2 martin return; 114 1.1.2.2 martin 115 1.1.2.2 martin mem = acpi_res_mem(&res, 0); 116 1.1.2.2 martin if (mem == NULL) { 117 1.1.2.2 martin aprint_error_dev(self, "couldn't find mem resource\n"); 118 1.1.2.2 martin goto done; 119 1.1.2.2 martin } 120 1.1.2.2 martin 121 1.1.2.2 martin irq = acpi_res_irq(&res, 0); 122 1.1.2.2 martin if (irq == NULL) { 123 1.1.2.2 martin aprint_error_dev(self, "couldn't find irq resource\n"); 124 1.1.2.2 martin goto done; 125 1.1.2.2 martin } 126 1.1.2.2 martin 127 1.1.2.2 martin sc->sc_dev = self; 128 1.1.2.2 martin sc->sc_iot = aa->aa_memt; 129 1.1.2.2 martin if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, &sc->sc_ioh) != 0) { 130 1.1.2.2 martin aprint_error_dev(self, "couldn't map registers\n"); 131 1.1.2.2 martin goto done; 132 1.1.2.2 martin } 133 1.1.2.2 martin 134 1.1.2.2 martin sc->sc_frequency = bsciic_acpi_vpu_clock_rate(); 135 1.1.2.2 martin if (sc->sc_frequency == 0) { 136 1.1.2.2 martin aprint_error_dev(self, "couldn't determine parent clock rate\n"); 137 1.1.2.2 martin goto done; 138 1.1.2.2 martin } 139 1.1.2.2 martin 140 1.1.2.2 martin rv = acpi_dsd_integer(aa->aa_node->ad_handle, "clock-frequency", &clock_freq); 141 1.1.2.2 martin if (ACPI_SUCCESS(rv)) 142 1.1.2.2 martin sc->sc_clkrate = clock_freq; 143 1.1.2.2 martin else 144 1.1.2.2 martin sc->sc_clkrate = 100000; 145 1.1.2.2 martin 146 1.1.2.2 martin bsciic_attach(sc); 147 1.1.2.2 martin 148 1.1.2.2 martin ih = acpi_intr_establish(self, (uint64_t)aa->aa_node->ad_handle, 149 1.1.2.2 martin IPL_VM, true, bsciic_intr, sc, device_xname(self)); 150 1.1.2.2 martin if (ih == NULL) { 151 1.1.2.2 martin aprint_error_dev(self, "couldn't install interrupt handler\n"); 152 1.1.2.2 martin goto done; 153 1.1.2.2 martin } 154 1.1.2.2 martin 155 1.1.2.2 martin iic_tag_init(&sc->sc_i2c); 156 1.1.2.2 martin sc->sc_i2c.ic_cookie = sc; 157 1.1.2.2 martin sc->sc_i2c.ic_acquire_bus = bsciic_acquire_bus; 158 1.1.2.2 martin sc->sc_i2c.ic_release_bus = bsciic_release_bus; 159 1.1.2.2 martin sc->sc_i2c.ic_exec = bsciic_exec; 160 1.1.2.2 martin 161 1.1.2.2 martin memset(&iba, 0, sizeof(iba)); 162 1.1.2.2 martin iba.iba_tag = &sc->sc_i2c; 163 1.1.2.2 martin iba.iba_child_devices = acpi_enter_i2c_devs(aa->aa_node); 164 1.1.2.2 martin config_found_ia(self, "i2cbus", &iba, iicbus_print); 165 1.1.2.2 martin 166 1.1.2.2 martin done: 167 1.1.2.2 martin acpi_resource_cleanup(&res); 168 1.1.2.2 martin } 169 1.1.2.2 martin 170 1.1.2.2 martin static u_int 171 1.1.2.2 martin bsciic_acpi_vpu_clock_rate(void) 172 1.1.2.2 martin { 173 1.1.2.2 martin uint32_t res; 174 1.1.2.2 martin int error; 175 1.1.2.2 martin 176 1.1.2.2 martin error = bcmmbox_request(BCMMBOX_CHANARM2VC, &vb_vpu, 177 1.1.2.2 martin sizeof(vb_vpu), &res); 178 1.1.2.2 martin if (error != 0) { 179 1.1.2.2 martin printf("%s: mbox request failed (%d)\n", __func__, error); 180 1.1.2.2 martin return 0; 181 1.1.2.2 martin } 182 1.1.2.2 martin 183 1.1.2.2 martin if (!vcprop_buffer_success_p(&vb_vpu.vb_hdr) || 184 1.1.2.2 martin !vcprop_tag_success_p(&vb_vpu.vbt_vpuclockrate.tag) || 185 1.1.2.2 martin vb_vpu.vbt_vpuclockrate.rate < 0) 186 1.1.2.2 martin return 0; 187 1.1.2.2 martin 188 1.1.2.2 martin return vb_vpu.vbt_vpuclockrate.rate; 189 1.1.2.2 martin } 190
Indexes created Wed Oct 22 13:09:56 GMT 2025