1 /* $NetBSD: bcm2835_emmc_acpi.c,v 1.2 2025/09/25 01:19:15 jmcneill Exp $ */ 2 3 /* 4 * Copyright (c) 2016 Kimihiro Nonaka <nonaka (at) NetBSD.org> 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. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: bcm2835_emmc_acpi.c,v 1.2 2025/09/25 01:19:15 jmcneill Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/device.h> 33 #include <sys/systm.h> 34 #include <sys/kmem.h> 35 36 #include <dev/acpi/acpireg.h> 37 #include <dev/acpi/acpivar.h> 38 #include <dev/acpi/acpi_intr.h> 39 40 #include <dev/sdmmc/sdhcreg.h> 41 #include <dev/sdmmc/sdhcvar.h> 42 #include <dev/sdmmc/sdmmcvar.h> 43 44 #include <arm/broadcom/bcm2835var.h> 45 #include <arm/broadcom/bcm2835_mbox.h> 46 47 #include <evbarm/rpi/vcio.h> 48 #include <evbarm/rpi/vcpm.h> 49 #include <evbarm/rpi/vcprop.h> 50 51 #define _COMPONENT ACPI_RESOURCE_COMPONENT 52 ACPI_MODULE_NAME ("bcmemmc_acpi") 53 54 static int bcmemmc_acpi_match(device_t, cfdata_t, void *); 55 static void bcmemmc_acpi_attach(device_t, device_t, void *); 56 static void bcmemmc_acpi_attach1(device_t); 57 58 static u_int bcmemmc_acpi_emmc_clock_rate(void); 59 60 static const char * const compatible[] = { 61 "BCM2847", 62 NULL 63 }; 64 65 static struct { 66 struct vcprop_buffer_hdr vb_hdr; 67 struct vcprop_tag_clockrate vbt_emmcclockrate; 68 struct vcprop_tag end; 69 } vb_emmc __cacheline_aligned = { 70 .vb_hdr = { 71 .vpb_len = sizeof(vb_emmc), 72 .vpb_rcode = VCPROP_PROCESS_REQUEST, 73 }, 74 .vbt_emmcclockrate = { 75 .tag = { 76 .vpt_tag = VCPROPTAG_GET_CLOCKRATE, 77 .vpt_len = VCPROPTAG_LEN(vb_emmc.vbt_emmcclockrate), 78 .vpt_rcode = VCPROPTAG_REQUEST 79 }, 80 .id = VCPROP_CLK_EMMC 81 }, 82 .end = { 83 .vpt_tag = VCPROPTAG_NULL 84 } 85 }; 86 87 struct bcmemmc_acpi_softc { 88 struct sdhc_softc sc; 89 bus_space_tag_t sc_memt; 90 bus_space_handle_t sc_memh; 91 bus_size_t sc_memsize; 92 void *sc_ih; 93 struct sdhc_host *sc_hosts[1]; 94 }; 95 96 CFATTACH_DECL_NEW(bcmemmc_acpi, sizeof(struct bcmemmc_acpi_softc), 97 bcmemmc_acpi_match, bcmemmc_acpi_attach, NULL, NULL); 98 99 static int 100 bcmemmc_acpi_match(device_t parent, cfdata_t match, void *opaque) 101 { 102 struct acpi_attach_args *aa = opaque; 103 104 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 105 return 0; 106 107 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 108 } 109 110 static void 111 bcmemmc_acpi_attach(device_t parent, device_t self, void *opaque) 112 { 113 struct bcmemmc_acpi_softc *sc = device_private(self); 114 struct acpi_attach_args *aa = opaque; 115 struct acpi_resources res; 116 struct acpi_mem *mem; 117 struct acpi_irq *irq; 118 ACPI_STATUS rv; 119 120 sc->sc.sc_dev = self; 121 sc->sc.sc_dmat = aa->aa_dmat; 122 sc->sc.sc_host = sc->sc_hosts; 123 sc->sc_memt = aa->aa_memt; 124 125 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 126 &res, &acpi_resource_parse_ops_default); 127 if (ACPI_FAILURE(rv)) 128 return; 129 130 mem = acpi_res_mem(&res, 0); 131 irq = acpi_res_irq(&res, 0); 132 if (mem == NULL || irq == NULL) { 133 aprint_error_dev(self, "incomplete resources\n"); 134 goto cleanup; 135 } 136 if (mem->ar_length == 0) { 137 aprint_error_dev(self, "zero length memory resource\n"); 138 goto cleanup; 139 } 140 sc->sc_memsize = mem->ar_length; 141 142 if (bus_space_map(sc->sc_memt, mem->ar_base, sc->sc_memsize, 0, 143 &sc->sc_memh)) { 144 aprint_error_dev(self, "couldn't map registers\n"); 145 goto cleanup; 146 } 147 148 sc->sc.sc_flags = SDHC_FLAG_32BIT_ACCESS | 149 SDHC_FLAG_NO_PWR0 | 150 SDHC_FLAG_HOSTCAPS | 151 SDHC_FLAG_NO_HS_BIT; 152 sc->sc.sc_caps = SDHC_VOLTAGE_SUPP_3_3V | SDHC_HIGH_SPEED_SUPP | 153 (SDHC_MAX_BLK_LEN_1024 << SDHC_MAX_BLK_LEN_SHIFT); 154 155 sc->sc_ih = acpi_intr_establish(self, 156 (uint64_t)(uintptr_t)aa->aa_node->ad_handle, 157 IPL_BIO, true, sdhc_intr, &sc->sc, device_xname(self)); 158 if (sc->sc_ih == NULL) { 159 aprint_error_dev(self, 160 "couldn't establish interrupt handler\n"); 161 goto unmap; 162 } 163 164 config_defer(self, bcmemmc_acpi_attach1); 165 166 acpi_resource_cleanup(&res); 167 return; 168 169 unmap: 170 bus_space_unmap(sc->sc_memt, sc->sc_memh, sc->sc_memsize); 171 sc->sc_memsize = 0; 172 cleanup: 173 acpi_resource_cleanup(&res); 174 } 175 176 static void 177 bcmemmc_acpi_attach1(device_t self) 178 { 179 struct bcmemmc_acpi_softc *sc = device_private(self); 180 181 sc->sc.sc_clkbase = bcmemmc_acpi_emmc_clock_rate() / 1000; 182 183 if (sdhc_host_found(&sc->sc, sc->sc_memt, sc->sc_memh, 184 sc->sc_memsize) != 0) { 185 aprint_error_dev(self, "couldn't initialize host\n"); 186 goto fail; 187 } 188 189 return; 190 191 fail: 192 if (sc->sc_ih != NULL) 193 acpi_intr_disestablish(sc->sc_ih); 194 sc->sc_ih = NULL; 195 } 196 197 static u_int 198 bcmemmc_acpi_emmc_clock_rate(void) 199 { 200 uint32_t res; 201 int error; 202 203 error = bcmmbox_request(BCMMBOX_CHANARM2VC, &vb_emmc, 204 sizeof(vb_emmc), &res); 205 if (error) { 206 printf("%s: mbox request failed (%d)\n", __func__, error); 207 return 0; 208 } 209 210 if (!vcprop_buffer_success_p(&vb_emmc.vb_hdr) || 211 !vcprop_tag_success_p(&vb_emmc.vbt_emmcclockrate.tag) || 212 vb_emmc.vbt_emmcclockrate.rate < 0) 213 return 0; 214 215 return vb_emmc.vbt_emmcclockrate.rate; 216 } 217
Indexes created Sun Oct 25 00:26:45 UTC 2026