The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/fsl_ocotp.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2014 Steven Lawrance <stl@koffein.net>
    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 AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, 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 __FBSDID("$FreeBSD: head/sys/arm/freescale/fsl_ocotp.c 331229 2018-03-20 00:03:49Z gonzo $");
   31 
   32 /*
   33  * Access to the Freescale i.MX6 On-Chip One-Time-Programmable Memory
   34  */
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/bus.h>
   41 #include <sys/rman.h>
   42 
   43 #include <dev/ofw/ofw_bus.h>
   44 #include <dev/ofw/ofw_bus_subr.h>
   45 
   46 #include <machine/bus.h>
   47 
   48 #include <arm/freescale/fsl_ocotpreg.h>
   49 #include <arm/freescale/fsl_ocotpvar.h>
   50 
   51 /*
   52  * Find the physical address and size of the ocotp registers and devmap them,
   53  * returning a pointer to the virtual address of the base.
   54  *
   55  * XXX This is temporary until we've worked out all the details of controlling
   56  * the load order of devices.  In an ideal world this device would be up and
   57  * running before anything that needs it.  When we're at a point to make that
   58  * happen, this little block of code, and the few lines in fsl_ocotp_read_4()
   59  * that refer to it can be deleted.
   60  */
   61 #include <vm/vm.h>
   62 #include <vm/pmap.h>
   63 #include <dev/fdt/fdt_common.h>
   64 #include <sys/devmap.h>
   65 
   66 static uint32_t   *ocotp_regs;
   67 static vm_size_t   ocotp_size;
   68 
   69 static void
   70 fsl_ocotp_devmap(void)
   71 {
   72         phandle_t child, root;
   73         u_long base, size;
   74 
   75         if ((root = OF_finddevice("/")) == -1)
   76                 goto fatal;
   77         if ((child = fdt_depth_search_compatible(root, "fsl,imx6q-ocotp", 0)) == 0)
   78                 goto fatal;
   79         if (fdt_regsize(child, &base, &size) != 0)
   80                 goto fatal;
   81 
   82         ocotp_size = (vm_size_t)size;
   83 
   84         if ((ocotp_regs = pmap_mapdev((vm_offset_t)base, ocotp_size)) == NULL)
   85                 goto fatal;
   86 
   87         return;
   88 fatal:
   89         panic("cannot find/map the ocotp registers");
   90 }
   91 /* XXX end of temporary code */
   92 
   93 struct ocotp_softc {
   94         device_t        dev;
   95         struct resource *mem_res;
   96 };
   97 
   98 static struct ocotp_softc *ocotp_sc;
   99 
  100 static inline uint32_t
  101 RD4(struct ocotp_softc *sc, bus_size_t off)
  102 {
  103 
  104         return (bus_read_4(sc->mem_res, off));
  105 }
  106 
  107 static int
  108 ocotp_detach(device_t dev)
  109 {
  110 
  111         /* The ocotp registers are always accessible. */
  112         return (EBUSY);
  113 }
  114 
  115 static int
  116 ocotp_attach(device_t dev)
  117 {
  118         struct ocotp_softc *sc;
  119         int err, rid;
  120 
  121         sc = device_get_softc(dev);
  122         sc->dev = dev;
  123 
  124         /* Allocate bus_space resources. */
  125         rid = 0;
  126         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  127             RF_ACTIVE);
  128         if (sc->mem_res == NULL) {
  129                 device_printf(dev, "Cannot allocate memory resources\n");
  130                 err = ENXIO;
  131                 goto out;
  132         }
  133 
  134         ocotp_sc = sc;
  135 
  136         /* We're done with the temporary mapping now. */
  137         if (ocotp_regs != NULL)
  138                 pmap_unmapdev((vm_offset_t)ocotp_regs, ocotp_size);
  139 
  140         err = 0;
  141 
  142 out:
  143         if (err != 0)
  144                 ocotp_detach(dev);
  145 
  146         return (err);
  147 }
  148 
  149 static int
  150 ocotp_probe(device_t dev)
  151 {
  152 
  153         if (!ofw_bus_status_okay(dev))
  154                 return (ENXIO);
  155 
  156         if (ofw_bus_is_compatible(dev, "fsl,imx6q-ocotp") == 0)
  157                 return (ENXIO);
  158 
  159         device_set_desc(dev, 
  160             "Freescale On-Chip One-Time-Programmable Memory");
  161 
  162         return (BUS_PROBE_DEFAULT);
  163 }
  164 
  165 uint32_t
  166 fsl_ocotp_read_4(bus_size_t off)
  167 {
  168 
  169         if (off > FSL_OCOTP_LAST_REG)
  170                 panic("fsl_ocotp_read_4: offset out of range");
  171 
  172         /* If we have a softcontext use the regular bus_space read. */
  173         if (ocotp_sc != NULL)
  174                 return (RD4(ocotp_sc, off));
  175 
  176         /*
  177          * Otherwise establish a tempory device mapping if necessary, and read
  178          * the device without any help from bus_space.
  179          *
  180          * XXX Eventually the code from there down can be deleted.
  181          */
  182         if (ocotp_regs == NULL)
  183                 fsl_ocotp_devmap();
  184 
  185         return (ocotp_regs[off / 4]);
  186 }
  187 
  188 static device_method_t ocotp_methods[] = {
  189         /* Device interface */
  190         DEVMETHOD(device_probe,  ocotp_probe),
  191         DEVMETHOD(device_attach, ocotp_attach),
  192         DEVMETHOD(device_detach, ocotp_detach),
  193 
  194         DEVMETHOD_END
  195 };
  196 
  197 static driver_t ocotp_driver = {
  198         "ocotp",
  199         ocotp_methods,
  200         sizeof(struct ocotp_softc)
  201 };
  202 
  203 static devclass_t ocotp_devclass;
  204 
  205 EARLY_DRIVER_MODULE(ocotp, simplebus, ocotp_driver, ocotp_devclass, 0, 0,
  206     BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
  207 

Cache object: e9a3b9e55f7b91961f2670e3351f46ce


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