1 /* $NetBSD: sunxi_sid.c,v 1.8 2024/08/13 07:20:23 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill@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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: sunxi_sid.c,v 1.8 2024/08/13 07:20:23 skrll Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/intr.h> 36 #include <sys/systm.h> 37 38 #include <dev/fdt/fdtvar.h> 39 40 #include <arm/sunxi/sunxi_sid.h> 41 42 #define EFUSE_THERMAL_CALIB0 0x34 43 #define EFUSE_THERMAL_CALIB1 0x38 44 45 struct sunxi_sid_config { 46 bus_size_t efuse_offset; 47 }; 48 49 static const struct sunxi_sid_config sun4i_a10_sid_config = { 50 .efuse_offset = 0, 51 }; 52 53 static const struct sunxi_sid_config sun8i_h3_sid_config = { 54 .efuse_offset = 0x200, 55 }; 56 57 static const struct device_compatible_entry compat_data[] = { 58 { .compat = "allwinner,sun4i-a10-sid", .data = &sun4i_a10_sid_config }, 59 { .compat = "allwinner,sun7i-a20-sid", .data = &sun4i_a10_sid_config }, 60 { .compat = "allwinner,sun8i-h3-sid", .data = &sun8i_h3_sid_config }, 61 { .compat = "allwinner,sun8i-a83t-sid", .data = &sun8i_h3_sid_config }, 62 { .compat = "allwinner,sun20i-d1-sid", .data = &sun8i_h3_sid_config }, 63 { .compat = "allwinner,sun50i-a64-sid", .data = &sun8i_h3_sid_config }, 64 DEVICE_COMPAT_EOL 65 }; 66 67 struct sunxi_sid_softc { 68 device_t sc_dev; 69 bus_space_tag_t sc_bst; 70 bus_space_handle_t sc_bsh; 71 const struct sunxi_sid_config *sc_conf; 72 }; 73 74 static struct sunxi_sid_softc *sid_softc = NULL; 75 76 #define EFUSE_READ(sc, reg) \ 77 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (sc)->sc_conf->efuse_offset + (reg)) 78 #define EFUSE_WRITE(sc, reg, val) \ 79 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (sc)->sc_conf->efuse_offset + (reg), (val)) 80 81 static int 82 sunxi_sid_match(device_t parent, cfdata_t cf, void *aux) 83 { 84 struct fdt_attach_args * const faa = aux; 85 86 return of_compatible_match(faa->faa_phandle, compat_data); 87 } 88 89 static void 90 sunxi_sid_attach(device_t parent, device_t self, void *aux) 91 { 92 struct sunxi_sid_softc * const sc = device_private(self); 93 struct fdt_attach_args * const faa = aux; 94 const int phandle = faa->faa_phandle; 95 bus_addr_t addr; 96 bus_size_t size; 97 98 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 99 aprint_error(": couldn't get registers\n"); 100 return; 101 } 102 103 sc->sc_dev = self; 104 sc->sc_bst = faa->faa_bst; 105 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) { 106 aprint_error(": couldn't map registers\n"); 107 return; 108 } 109 sc->sc_conf = of_compatible_lookup(phandle, compat_data)->data; 110 111 aprint_naive("\n"); 112 aprint_normal(": Security ID EFUSE\n"); 113 114 KASSERT(sid_softc == NULL); 115 sid_softc = sc; 116 } 117 118 CFATTACH_DECL_NEW(sunxi_sid, sizeof(struct sunxi_sid_softc), 119 sunxi_sid_match, sunxi_sid_attach, NULL, NULL); 120 121 int 122 sunxi_sid_read_tscalib(uint32_t *calib) 123 { 124 if (sid_softc == NULL) 125 return ENXIO; 126 127 calib[0] = EFUSE_READ(sid_softc, EFUSE_THERMAL_CALIB0); 128 calib[1] = EFUSE_READ(sid_softc, EFUSE_THERMAL_CALIB1); 129 return 0; 130 } 131