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  * Copyright (c) 2014 Steven Lawrance <stl@koffein.net>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.1/sys/arm/freescale/fsl_ocotp.c 298627 2016-04-26 11:53:37Z br $");
   29 
   30 /*
   31  * Access to the Freescale i.MX6 On-Chip One-Time-Programmable Memory
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/bus.h>
   39 #include <sys/rman.h>
   40 
   41 #include <dev/ofw/ofw_bus.h>
   42 #include <dev/ofw/ofw_bus_subr.h>
   43 
   44 #include <machine/bus.h>
   45 
   46 #include <arm/freescale/fsl_ocotpreg.h>
   47 #include <arm/freescale/fsl_ocotpvar.h>
   48 
   49 /*
   50  * Find the physical address and size of the ocotp registers and devmap them,
   51  * returning a pointer to the virtual address of the base.
   52  *
   53  * XXX This is temporary until we've worked out all the details of controlling
   54  * the load order of devices.  In an ideal world this device would be up and
   55  * running before anything that needs it.  When we're at a point to make that
   56  * happen, this little block of code, and the few lines in fsl_ocotp_read_4()
   57  * that refer to it can be deleted.
   58  */
   59 #include <vm/vm.h>
   60 #include <vm/pmap.h>
   61 #include <dev/fdt/fdt_common.h>
   62 #include <sys/devmap.h>
   63 
   64 static uint32_t   *ocotp_regs;
   65 static vm_size_t   ocotp_size;
   66 
   67 static void
   68 fsl_ocotp_devmap(void)
   69 {
   70         phandle_t child, root;
   71         u_long base, size;
   72 
   73         if ((root = OF_finddevice("/")) == 0)
   74                 goto fatal;
   75         if ((child = fdt_depth_search_compatible(root, "fsl,imx6q-ocotp", 0)) == 0)
   76                 goto fatal;
   77         if (fdt_regsize(child, &base, &size) != 0)
   78                 goto fatal;
   79 
   80         ocotp_size = (vm_size_t)size;
   81 
   82         if ((ocotp_regs = pmap_mapdev((vm_offset_t)base, ocotp_size)) == NULL)
   83                 goto fatal;
   84 
   85         return;
   86 fatal:
   87         panic("cannot find/map the ocotp registers");
   88 }
   89 /* XXX end of temporary code */
   90 
   91 struct ocotp_softc {
   92         device_t        dev;
   93         struct resource *mem_res;
   94 };
   95 
   96 static struct ocotp_softc *ocotp_sc;
   97 
   98 static inline uint32_t
   99 RD4(struct ocotp_softc *sc, bus_size_t off)
  100 {
  101 
  102         return (bus_read_4(sc->mem_res, off));
  103 }
  104 
  105 static int
  106 ocotp_detach(device_t dev)
  107 {
  108 
  109         /* The ocotp registers are always accessible. */
  110         return (EBUSY);
  111 }
  112 
  113 static int
  114 ocotp_attach(device_t dev)
  115 {
  116         struct ocotp_softc *sc;
  117         int err, rid;
  118 
  119         sc = device_get_softc(dev);
  120         sc->dev = dev;
  121 
  122         /* Allocate bus_space resources. */
  123         rid = 0;
  124         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  125             RF_ACTIVE);
  126         if (sc->mem_res == NULL) {
  127                 device_printf(dev, "Cannot allocate memory resources\n");
  128                 err = ENXIO;
  129                 goto out;
  130         }
  131 
  132         ocotp_sc = sc;
  133 
  134         /* We're done with the temporary mapping now. */
  135         if (ocotp_regs != NULL)
  136                 pmap_unmapdev((vm_offset_t)ocotp_regs, ocotp_size);
  137 
  138         err = 0;
  139 
  140 out:
  141         if (err != 0)
  142                 ocotp_detach(dev);
  143 
  144         return (err);
  145 }
  146 
  147 static int
  148 ocotp_probe(device_t dev)
  149 {
  150 
  151         if (!ofw_bus_status_okay(dev))
  152                 return (ENXIO);
  153 
  154         if (ofw_bus_is_compatible(dev, "fsl,imx6q-ocotp") == 0)
  155                 return (ENXIO);
  156 
  157         device_set_desc(dev, 
  158             "Freescale On-Chip One-Time-Programmable Memory");
  159 
  160         return (BUS_PROBE_DEFAULT);
  161 }
  162 
  163 uint32_t
  164 fsl_ocotp_read_4(bus_size_t off)
  165 {
  166 
  167         if (off > FSL_OCOTP_LAST_REG)
  168                 panic("fsl_ocotp_read_4: offset out of range");
  169 
  170         /* If we have a softcontext use the regular bus_space read. */
  171         if (ocotp_sc != NULL)
  172                 return (RD4(ocotp_sc, off));
  173 
  174         /*
  175          * Otherwise establish a tempory device mapping if necessary, and read
  176          * the device without any help from bus_space.
  177          *
  178          * XXX Eventually the code from there down can be deleted.
  179          */
  180         if (ocotp_regs == NULL)
  181                 fsl_ocotp_devmap();
  182 
  183         return (ocotp_regs[off / 4]);
  184 }
  185 
  186 static device_method_t ocotp_methods[] = {
  187         /* Device interface */
  188         DEVMETHOD(device_probe,  ocotp_probe),
  189         DEVMETHOD(device_attach, ocotp_attach),
  190         DEVMETHOD(device_detach, ocotp_detach),
  191 
  192         DEVMETHOD_END
  193 };
  194 
  195 static driver_t ocotp_driver = {
  196         "ocotp",
  197         ocotp_methods,
  198         sizeof(struct ocotp_softc)
  199 };
  200 
  201 static devclass_t ocotp_devclass;
  202 
  203 EARLY_DRIVER_MODULE(ocotp, simplebus, ocotp_driver, ocotp_devclass, 0, 0,
  204     BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
  205 

Cache object: ff14e3fb3203bb11733195e61cb4cfbf


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