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      1 /*	$NetBSD: imx6_ocotp.c,v 1.3 2024/02/07 04:20:27 msaitoh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2014 Ryo Shimizu
      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 1.3 2024/02/07 04:20:27 msaitoh 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 static const struct device_compatible_entry compat_data[] = {
     66 	{ .compat = "fsl,imx6q-ocotp" },
     67 	{ .compat = "fsl,imx6sl-ocotp" },
     68 	{ .compat = "fsl,imx6sll-ocotp" },
     69 	{ .compat = "fsl,imx6sx-ocotp" },
     70 	{ .compat = "fsl,imx6ul-ocotp" },
     71 	{ .compat = "fsl,imx6ull-ocotp" },
     72 	DEVICE_COMPAT_EOL
     73 };
     74 
     75 int
     76 imxocotp_match(device_t parent, cfdata_t cf, void *aux)
     77 {
     78 	struct fdt_attach_args * const faa = aux;
     79 
     80 	if (ocotp_softc != NULL)
     81 		return 0;
     82 
     83 	return of_compatible_match(faa->faa_phandle, compat_data);
     84 }
     85 
     86 /* ARGSUSED */
     87 static void
     88 imxocotp_attach(device_t parent, device_t self, void *aux)
     89 {
     90 	struct imxocotp_softc *sc = device_private(self);
     91 	struct fdt_attach_args * const faa = aux;
     92 	const int phandle = faa->faa_phandle;
     93 	bus_addr_t addr;
     94 	bus_size_t size;
     95 	int error;
     96 
     97 	sc->sc_iot = faa->faa_bst;
     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_clk = fdtbus_clock_get_index(phandle, 0);
    104 	if (sc->sc_clk == NULL) {
    105 		aprint_error(": couldn't get clock\n");
    106 		return;
    107 	}
    108 
    109 	error = clk_enable(sc->sc_clk);
    110 	if (error) {
    111 		aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
    112 		return;
    113 	}
    114 
    115 	aprint_naive("\n");
    116 	aprint_normal(": On-Chip OTP Controller\n");
    117 	if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) {
    118 		aprint_error_dev(self, "Cannot map registers\n");
    119 		return;
    120 	}
    121 	ocotp_softc = sc;
    122 	sc->sc_ios = size;
    123 
    124 	uint32_t v = imxocotp_read(OCOTP_VERSION);
    125 	aprint_normal_dev(self, "OCOTP_VERSION %d.%d.%d\n", (v >> 24) & 0xff, (v >> 16) & 0xff, v & 0xffff);
    126 
    127 	return;
    128 }
    129 
    130 uint32_t
    131 imxocotp_read(uint32_t addr)
    132 {
    133 	struct imxocotp_softc *sc = ocotp_softc;
    134 
    135 	if (sc == NULL)
    136 		return 0;
    137 
    138 	if (addr > sc->sc_ios)
    139 		return 0;
    140 
    141 	return bus_space_read_4(sc->sc_iot, sc->sc_ioh, addr);
    142 }
    143