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      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 
     50 static int ingenic_efuse_match(device_t, struct cfdata *, void *);
     51 static void ingenic_efuse_attach(device_t, device_t, void *);
     52 
     53 struct 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 
     60 static void ingenic_efuse_read(struct efuse_softc *, int, int, uint8_t *);
     61 
     62 void ingenic_set_enaddr(uint8_t *);
     63 
     64 CFATTACH_DECL_NEW(ingenic_efuse, sizeof(struct efuse_softc),
     65     ingenic_efuse_match, ingenic_efuse_attach, NULL, NULL);
     66 
     67 /* ARGSUSED */
     68 static int
     69 ingenic_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 */
     80 static void
     81 ingenic_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 
    118 static void
    119 ingenic_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