205 lines
5.0 KiB
C
205 lines
5.0 KiB
C
/*-
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* Copyright (c) 2014 Steven Lawrance <stl@koffein.net>
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Access to the Freescale i.MX6 On-Chip One-Time-Programmable Memory
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <arm/freescale/fsl_ocotpreg.h>
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#include <arm/freescale/fsl_ocotpvar.h>
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/*
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* Find the physical address and size of the ocotp registers and devmap them,
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* returning a pointer to the virtual address of the base.
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*
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* XXX This is temporary until we've worked out all the details of controlling
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* the load order of devices. In an ideal world this device would be up and
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* running before anything that needs it. When we're at a point to make that
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* happen, this little block of code, and the few lines in fsl_ocotp_read_4()
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* that refer to it can be deleted.
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*/
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <dev/fdt/fdt_common.h>
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#include <machine/devmap.h>
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static uint32_t *ocotp_regs;
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static vm_size_t ocotp_size;
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static void
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fsl_ocotp_devmap(void)
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{
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phandle_t child, root;
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u_long base, size;
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if ((root = OF_finddevice("/")) == 0)
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goto fatal;
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if ((child = fdt_depth_search_compatible(root, "fsl,imx6q-ocotp", 0)) == 0)
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goto fatal;
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if (fdt_regsize(child, &base, &size) != 0)
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goto fatal;
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ocotp_size = (vm_size_t)size;
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if ((ocotp_regs = pmap_mapdev((vm_offset_t)base, ocotp_size)) == NULL)
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goto fatal;
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return;
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fatal:
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panic("cannot find/map the ocotp registers");
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}
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/* XXX end of temporary code */
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struct ocotp_softc {
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device_t dev;
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struct resource *mem_res;
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};
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static struct ocotp_softc *ocotp_sc;
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static inline uint32_t
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RD4(struct ocotp_softc *sc, bus_size_t off)
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{
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return (bus_read_4(sc->mem_res, off));
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}
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static int
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ocotp_detach(device_t dev)
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{
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/* The ocotp registers are always accessible. */
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return (EBUSY);
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}
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static int
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ocotp_attach(device_t dev)
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{
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struct ocotp_softc *sc;
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int err, rid;
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sc = device_get_softc(dev);
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sc->dev = dev;
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/* Allocate bus_space resources. */
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rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "Cannot allocate memory resources\n");
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err = ENXIO;
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goto out;
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}
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ocotp_sc = sc;
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/* We're done with the temporary mapping now. */
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if (ocotp_regs != NULL)
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pmap_unmapdev((vm_offset_t)ocotp_regs, ocotp_size);
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err = 0;
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out:
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if (err != 0)
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ocotp_detach(dev);
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return (err);
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}
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static int
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ocotp_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_is_compatible(dev, "fsl,imx6q-ocotp") == 0)
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return (ENXIO);
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device_set_desc(dev,
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"Freescale On-Chip One-Time-Programmable Memory");
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return (BUS_PROBE_DEFAULT);
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}
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uint32_t
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fsl_ocotp_read_4(bus_size_t off)
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{
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if (off > FSL_OCOTP_LAST_REG)
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panic("fsl_ocotp_read_4: offset out of range");
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/* If we have a softcontext use the regular bus_space read. */
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if (ocotp_sc != NULL)
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return (RD4(ocotp_sc, off));
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/*
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* Otherwise establish a tempory device mapping if necessary, and read
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* the device without any help from bus_space.
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*
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* XXX Eventually the code from there down can be deleted.
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*/
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if (ocotp_regs == NULL)
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fsl_ocotp_devmap();
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return (ocotp_regs[off / 4]);
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}
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static device_method_t ocotp_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ocotp_probe),
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DEVMETHOD(device_attach, ocotp_attach),
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DEVMETHOD(device_detach, ocotp_detach),
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DEVMETHOD_END
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};
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static driver_t ocotp_driver = {
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"ocotp",
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ocotp_methods,
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sizeof(struct ocotp_softc)
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};
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static devclass_t ocotp_devclass;
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DRIVER_MODULE(ocotp, simplebus, ocotp_driver, ocotp_devclass, 0, 0);
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