1/* $NetBSD: ingenic_efuse.c,v 1.3 2015/10/14 15:44:57 macallan Exp $ */ 2 3/*- 4 * Copyright (c) 2015 Michael Lorenz 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/* 30 * a driver for the 'EFUSE Slave Interface' found on JZ4780 31 * more or less 8kBit of non-volatile storage containing things like MAC 32 * address, various encryption keys, boot code, serial numbers and parameters. 33 * Using it only to get the MAC address for now. 34 */ 35 36#include <sys/cdefs.h> 37__KERNEL_RCSID(0, "$NetBSD: ingenic_efuse.c,v 1.3 2015/10/14 15:44:57 macallan Exp $"); 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/device.h> 42#include <sys/mutex.h> 43#include <sys/bus.h> 44 45#include <mips/ingenic/ingenic_var.h> 46#include <mips/ingenic/ingenic_regs.h> 47 48#include "opt_ingenic.h" 49 50static int ingenic_efuse_match(device_t, struct cfdata *, void *); 51static void ingenic_efuse_attach(device_t, device_t, void *); 52 53struct efuse_softc { 54 device_t sc_dev; 55 bus_space_tag_t sc_iot; 56 bus_space_handle_t sc_ioh; 57 uint8_t sc_data[0x20]; 58}; 59 60static void ingenic_efuse_read(struct efuse_softc *, int, int, uint8_t *); 61 62void ingenic_set_enaddr(uint8_t *); 63 64CFATTACH_DECL_NEW(ingenic_efuse, sizeof(struct efuse_softc), 65 ingenic_efuse_match, ingenic_efuse_attach, NULL, NULL); 66 67/* ARGSUSED */ 68static int 69ingenic_efuse_match(device_t parent, struct cfdata *match, void *aux) 70{ 71 struct apbus_attach_args *aa = aux; 72 73 if (strcmp(aa->aa_name, "efuse") != 0) 74 return 0; 75 76 return 1; 77} 78 79/* ARGSUSED */ 80static void 81ingenic_efuse_attach(device_t parent, device_t self, void *aux) 82{ 83 struct efuse_softc *sc = device_private(self); 84 struct apbus_attach_args *aa = aux; 85 int error; 86 87 sc->sc_dev = self; 88 89 sc->sc_iot = aa->aa_bst; 90 91 if (aa->aa_addr == 0) 92 aa->aa_addr = JZ_EFUSE; 93 94 error = bus_space_map(aa->aa_bst, aa->aa_addr, 0x30, 0, &sc->sc_ioh); 95 if (error) { 96 aprint_error_dev(self, 97 "can't map registers for %s: %d\n", aa->aa_name, error); 98 return; 99 } 100 101 aprint_naive(": Ingenic EFUSE Slave Interface\n"); 102 aprint_normal(": Ingenic EFUSE Slave Interface\n"); 103 ingenic_efuse_read(sc, 8, 0x20, sc->sc_data); 104 ingenic_set_enaddr(&sc->sc_data[0x1a]); 105#ifdef INGENIC_DEBUG 106 { 107 int i, j; 108 for (i = 0; i < 0x20; i += 8) { 109 printf("%02x:", i); 110 for (j = 0; j < 8; j++) 111 printf(" %02x", sc->sc_data[i + j]); 112 printf("\n"); 113 } 114 } 115#endif 116} 117 118static void 119ingenic_efuse_read(struct efuse_softc *sc, int addr, int len, uint8_t *buf) 120{ 121 uint32_t abuf; 122 int i; 123 124 /* default, just in case */ 125 bus_space_write_4(sc->sc_iot, sc->sc_ioh, JZ_EFUCFG, 0x00040000); 126 bus_space_write_4(sc->sc_iot, sc->sc_ioh, JZ_EFUCTRL, 127 JZ_EFUSE_READ | 128 (addr << JZ_EFUSE_ADDR_SHIFT) | 129 ((len - 1) << JZ_EFUSE_SIZE_SHIFT)); 130 do {} while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, JZ_EFUSTATE) & 131 JZ_EFUSE_RD_DONE) == 0); 132 for (i = 0; i < len; i += 4) { 133 abuf = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 134 JZ_EFUDATA0 + i); 135 memcpy(buf, &abuf, 4); 136 buf += 4; 137 } 138} 139