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126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/* $NetBSD: imx6_ocotp.c,v 1.1 2014/09/25 05:05:28 ryo Exp $ */
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/*
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* Copyright (c) 2014 Ryo Shimizu <ryo@nerv.org>
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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 1.1 2014/09/25 05:05:28 ryo 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 <arm/imx/imx6var.h>
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#include <arm/imx/imx6_reg.h>
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#include <arm/imx/imx6_ocotpreg.h>
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#include <arm/imx/imx6_ocotpvar.h>
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#include "locators.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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};
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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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/* ARGSUSED */
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static int
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imxocotp_match(device_t parent __unused, struct cfdata *match __unused, void *aux)
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{
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struct axi_attach_args *aa;
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aa = aux;
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if (ocotp_softc != NULL)
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return 0;
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switch (aa->aa_addr) {
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case (IMX6_AIPS2_BASE + AIPS2_OCOTP_CTRL_BASE):
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return 1;
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}
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return 0;
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}
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/* ARGSUSED */
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static void
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imxocotp_attach(device_t parent __unused, device_t self, void *aux)
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{
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struct imxocotp_softc *sc;
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struct axi_attach_args *aa;
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uint32_t v;
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aa = aux;
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sc = device_private(self);
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sc->sc_dev = self;
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sc->sc_iot = aa->aa_iot;
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sc->sc_addr = aa->aa_addr;
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if (aa->aa_size == AXICF_SIZE_DEFAULT)
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aa->aa_size = AIPS2_OCOTP_CTRL_SIZE;
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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, sc->sc_addr, aa->aa_size, 0,
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&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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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;
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if ((sc = ocotp_softc) == NULL)
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return 0;
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if (addr > AIPS2_OCOTP_CTRL_SIZE)
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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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