143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/* $NetBSD: imx6_ocotp.c,v 1.3 2024/02/07 04:20:27 msaitoh Exp $ */
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/*
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* Copyright (c) 2014 Ryo Shimizu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* i.MX6 On-Chip OTP Controller
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: imx6_ocotp.c,v 1.3 2024/02/07 04:20:27 msaitoh Exp $");
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#include <sys/bus.h>
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#include <sys/device.h>
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#include <sys/param.h>
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#include <dev/fdt/fdtvar.h>
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#include <arm/nxp/imx6_ocotpreg.h>
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#include <arm/nxp/imx6_ocotpvar.h>
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struct imxocotp_softc {
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device_t sc_dev;
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bus_addr_t sc_addr;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_ioh;
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bus_size_t sc_ios;
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struct clk *sc_clk;
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};
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static struct imxocotp_softc *ocotp_softc;
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static int imxocotp_match(device_t, struct cfdata *, void *);
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static void imxocotp_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(imxocotp, sizeof(struct imxocotp_softc),
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imxocotp_match, imxocotp_attach, NULL, NULL);
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "fsl,imx6q-ocotp" },
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{ .compat = "fsl,imx6sl-ocotp" },
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{ .compat = "fsl,imx6sll-ocotp" },
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{ .compat = "fsl,imx6sx-ocotp" },
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{ .compat = "fsl,imx6ul-ocotp" },
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{ .compat = "fsl,imx6ull-ocotp" },
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DEVICE_COMPAT_EOL
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};
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int
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imxocotp_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct fdt_attach_args * const faa = aux;
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if (ocotp_softc != NULL)
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return 0;
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return of_compatible_match(faa->faa_phandle, compat_data);
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}
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/* ARGSUSED */
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static void
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imxocotp_attach(device_t parent, device_t self, void *aux)
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{
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struct imxocotp_softc *sc = device_private(self);
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struct fdt_attach_args * const faa = aux;
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const int phandle = faa->faa_phandle;
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bus_addr_t addr;
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bus_size_t size;
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int error;
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sc->sc_iot = faa->faa_bst;
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if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
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aprint_error(": couldn't get registers\n");
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return;
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}
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sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
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if (sc->sc_clk == NULL) {
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aprint_error(": couldn't get clock\n");
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return;
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}
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error = clk_enable(sc->sc_clk);
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if (error) {
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aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
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return;
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}
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aprint_naive("\n");
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aprint_normal(": On-Chip OTP Controller\n");
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if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) {
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aprint_error_dev(self, "Cannot map registers\n");
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return;
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}
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ocotp_softc = sc;
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sc->sc_ios = size;
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uint32_t v = imxocotp_read(OCOTP_VERSION);
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aprint_normal_dev(self, "OCOTP_VERSION %d.%d.%d\n", (v >> 24) & 0xff, (v >> 16) & 0xff, v & 0xffff);
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return;
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}
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uint32_t
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imxocotp_read(uint32_t addr)
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{
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struct imxocotp_softc *sc = ocotp_softc;
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if (sc == NULL)
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return 0;
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if (addr > sc->sc_ios)
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return 0;
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return bus_space_read_4(sc->sc_iot, sc->sc_ioh, addr);
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}
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