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sunxi_sid.c revision 1.1 
      1 /* $NetBSD: sunxi_sid.c,v 1.1 2017/10/03 23:42:17 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) 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 1.1 2017/10/03 23:42:17 jmcneill 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 of_compat_data compat_data[] = {
     58 	{ "allwinner,sun4i-a10-sid",	(uintptr_t)&sun4i_a10_sid_config },
     59 	{ "allwinner,sun7i-a20-sid",	(uintptr_t)&sun4i_a10_sid_config },
     60 	{ "allwinner,sun8i-h3-sid",	(uintptr_t)&sun8i_h3_sid_config },
     61 	{ NULL }
     62 };
     63 
     64 struct sunxi_sid_softc {
     65 	device_t			sc_dev;
     66 	bus_space_tag_t			sc_bst;
     67 	bus_space_handle_t		sc_bsh;
     68 	const struct sunxi_sid_config	*sc_conf;
     69 };
     70 
     71 static struct sunxi_sid_softc *sid_softc = NULL;
     72 
     73 #define EFUSE_READ(sc, reg) \
     74     bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (sc)->sc_conf->efuse_offset + (reg))
     75 #define EFUSE_WRITE(sc, reg, val) \
     76     bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (sc)->sc_conf->efuse_offset + (reg), (val))
     77 
     78 static int
     79 sunxi_sid_match(device_t parent, cfdata_t cf, void *aux)
     80 {
     81 	struct fdt_attach_args * const faa = aux;
     82 
     83 	return of_match_compat_data(faa->faa_phandle, compat_data);
     84 }
     85 
     86 static void
     87 sunxi_sid_attach(device_t parent, device_t self, void *aux)
     88 {
     89 	struct sunxi_sid_softc * const sc = device_private(self);
     90 	struct fdt_attach_args * const faa = aux;
     91 	const int phandle = faa->faa_phandle;
     92 	bus_addr_t addr;
     93 	bus_size_t size;
     94 
     95 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     96 		aprint_error(": couldn't get registers\n");
     97 		return;
     98 	}
     99 
    100 	sc->sc_dev = self;
    101 	sc->sc_bst = faa->faa_bst;
    102 	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
    103 		aprint_error(": couldn't map registers\n");
    104 		return;
    105 	}
    106 	sc->sc_conf = (void *)of_search_compatible(phandle, compat_data)->data;
    107 
    108 	aprint_naive("\n");
    109 	aprint_normal(": Security ID EFUSE\n");
    110 
    111 	KASSERT(sid_softc == NULL);
    112 	sid_softc = sc;
    113 }
    114 
    115 CFATTACH_DECL_NEW(sunxi_sid, sizeof(struct sunxi_sid_softc),
    116 	sunxi_sid_match, sunxi_sid_attach, NULL, NULL);
    117 
    118 int
    119 sunxi_sid_read_tscalib(uint32_t *calib)
    120 {
    121 	if (sid_softc == NULL)
    122 		return ENXIO;
    123 
    124 	calib[0] = EFUSE_READ(sid_softc, EFUSE_THERMAL_CALIB0);
    125 	calib[1] = EFUSE_READ(sid_softc, EFUSE_THERMAL_CALIB1);
    126 	return 0;
    127 }
    128