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imx6_ocotp.c revision 1.1.2.2 
      1 /*	$NetBSD: imx6_ocotp.c,v 1.1.2.2 2021/01/03 16:34:52 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2014 Ryo Shimizu <ryo (at) nerv.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. 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
     18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     19  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     25  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /*
     30  * i.MX6 On-Chip OTP Controller
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: imx6_ocotp.c,v 1.1.2.2 2021/01/03 16:34:52 thorpej Exp $");
     35 
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 #include <sys/param.h>
     39 
     40 #include <dev/fdt/fdtvar.h>
     41 
     42 #include <arm/nxp/imx6_ocotpreg.h>
     43 #include <arm/nxp/imx6_ocotpvar.h>
     44 
     45 struct imxocotp_softc {
     46 	device_t sc_dev;
     47 
     48 	bus_addr_t sc_addr;
     49 	bus_space_tag_t sc_iot;
     50 	bus_space_handle_t sc_ioh;
     51 	bus_size_t sc_ios;
     52 
     53 	struct clk *sc_clk;
     54 
     55 };
     56 
     57 static struct imxocotp_softc *ocotp_softc;
     58 
     59 static int imxocotp_match(device_t, struct cfdata *, void *);
     60 static void imxocotp_attach(device_t, device_t, void *);
     61 
     62 CFATTACH_DECL_NEW(imxocotp, sizeof(struct imxocotp_softc),
     63     imxocotp_match, imxocotp_attach, NULL, NULL);
     64 
     65 int
     66 imxocotp_match(device_t parent, cfdata_t cf, void *aux)
     67 {
     68 	const char * const compatible[] = {
     69 	    "fsl,imx6q-ocotp",
     70 	    "fsl,imx6sl-ocotp",
     71 	    "fsl,imx6sll-ocotp",
     72 	    "fsl,imx6sx-ocotp",
     73 	    "fsl,imx6ul-ocotp",
     74 	    "fsl,imx6ull-ocotp",
     75 	     NULL
     76 	};
     77 	struct fdt_attach_args * const faa = aux;
     78 
     79 	if (ocotp_softc != NULL)
     80 		return 0;
     81 
     82 	return of_match_compatible(faa->faa_phandle, compatible);
     83 }
     84 
     85 /* ARGSUSED */
     86 static void
     87 imxocotp_attach(device_t parent, device_t self, void *aux)
     88 {
     89 	struct imxocotp_softc *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 	int error;
     95 
     96 	sc->sc_iot = faa->faa_bst;
     97 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     98 		aprint_error(": couldn't get registers\n");
     99 		return;
    100 	}
    101 
    102 	sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
    103 	if (sc->sc_clk == NULL) {
    104 		aprint_error(": couldn't get clock\n");
    105 		return;
    106 	}
    107 
    108 	error = clk_enable(sc->sc_clk);
    109 	if (error) {
    110 		aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
    111 		return;
    112 	}
    113 
    114 	aprint_naive("\n");
    115 	aprint_normal(": On-Chip OTP Controller\n");
    116 	if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) {
    117 		aprint_error_dev(self, "Cannot map registers\n");
    118 		return;
    119 	}
    120 	ocotp_softc = sc;
    121 	sc->sc_ios = size;
    122 
    123 	uint32_t v = imxocotp_read(OCOTP_VERSION);
    124 	aprint_normal_dev(self, "OCOTP_VERSION %d.%d.%d\n", (v >> 24) & 0xff, (v >> 16) & 0xff, v & 0xffff);
    125 
    126 	return;
    127 }
    128 
    129 uint32_t
    130 imxocotp_read(uint32_t addr)
    131 {
    132 	struct imxocotp_softc *sc = ocotp_softc;
    133 
    134 	if (sc == NULL)
    135 		return 0;
    136 
    137 	if (addr > sc->sc_ios)
    138 		return 0;
    139 
    140 	return bus_space_read_4(sc->sc_iot, sc->sc_ioh, addr);
    141 }
    142