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author | gjb <gjb@FreeBSD.org> | 2016-04-11 15:24:59 +0000 |
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committer | gjb <gjb@FreeBSD.org> | 2016-04-11 15:24:59 +0000 |
commit | e0e3598ce13850597a66fd28d102b36881f7d610 (patch) | |
tree | f5194d1ce3fa45b67cf63080fc519fec83abc57a /sys/mips/mediatek/fdt_reset.c | |
parent | cbc3bd9845ba5fd58e8132f9565cfbc41433938d (diff) | |
parent | 26836fccd261358467b3d92e77ff4695af286de9 (diff) | |
download | FreeBSD-src-e0e3598ce13850597a66fd28d102b36881f7d610.zip FreeBSD-src-e0e3598ce13850597a66fd28d102b36881f7d610.tar.gz |
MFH
Sponsored by: The FreeBSD Foundation
Diffstat (limited to 'sys/mips/mediatek/fdt_reset.c')
-rw-r--r-- | sys/mips/mediatek/fdt_reset.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/sys/mips/mediatek/fdt_reset.c b/sys/mips/mediatek/fdt_reset.c new file mode 100644 index 0000000..5ff2758 --- /dev/null +++ b/sys/mips/mediatek/fdt_reset.c @@ -0,0 +1,125 @@ +/*- + * Copyright (c) 2016 Stanislav Galabov + * Copyright (c) 2014 Ian Lepore <ian@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/queue.h> +#include <sys/systm.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include "fdt_reset_if.h" +#include <mips/mediatek/fdt_reset.h> + +/* + * Loop through all the tuples in the resets= property for a device, asserting + * or deasserting each reset. + * + * Be liberal about errors for now: warn about a failure to (de)assert but keep + * trying with any other resets in the list. Return ENXIO if any errors were + * found, and let the caller decide whether the problem is fatal. + */ +static int +assert_deassert_all(device_t consumer, boolean_t assert) +{ + phandle_t rnode; + device_t resetdev; + int resetnum, err, i, ncells; + uint32_t *resets; + boolean_t anyerrors; + + rnode = ofw_bus_get_node(consumer); + ncells = OF_getencprop_alloc(rnode, "resets", sizeof(*resets), + (void **)&resets); + if (!assert && ncells < 2) { + device_printf(consumer, "Warning: No resets specified in fdt " + "data; device may not function."); + return (ENXIO); + } + anyerrors = false; + for (i = 0; i < ncells; i += 2) { + resetdev = OF_device_from_xref(resets[i]); + resetnum = resets[i + 1]; + if (resetdev == NULL) { + if (!assert) + device_printf(consumer, "Warning: can not find " + "driver for reset number %u; device may " + "not function\n", resetnum); + anyerrors = true; + continue; + } + if (assert) + err = FDT_RESET_ASSERT(resetdev, resetnum); + else + err = FDT_RESET_DEASSERT(resetdev, resetnum); + if (err != 0) { + if (!assert) + device_printf(consumer, "Warning: failed to " + "deassert reset number %u; device may not " + "function\n", resetnum); + anyerrors = true; + } + } + free(resets, M_OFWPROP); + return (anyerrors ? ENXIO : 0); +} + +int +fdt_reset_assert_all(device_t consumer) +{ + + return (assert_deassert_all(consumer, true)); +} + +int +fdt_reset_deassert_all(device_t consumer) +{ + + return (assert_deassert_all(consumer, false)); +} + +void +fdt_reset_register_provider(device_t provider) +{ + + OF_device_register_xref( + OF_xref_from_node(ofw_bus_get_node(provider)), provider); +} + +void +fdt_reset_unregister_provider(device_t provider) +{ + + OF_device_register_xref(OF_xref_from_device(provider), NULL); +} + |