10998af48d
- machine dependent low level init code - SoC clocks detection and some utility functions - Common interface to read/write/modify SoC system control registers, used by some of the other drivers and utility functions - simple FDT resets support, based on the fdt_clock implementation already in the tree. For the moment resets and clocks are managed using these implementations. I am planning to port those to the new extres framework in the future, but currently I simply don't have time to do this part too. Approved by: adrian (mentor) Sponsored by: Smartcom - Bulgaria AD Differential Revision: https://reviews.freebsd.org/D5826
126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/*-
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* Copyright (c) 2016 Stanislav Galabov
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* Copyright (c) 2014 Ian Lepore <ian@freebsd.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 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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/systm.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 "fdt_reset_if.h"
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#include <mips/mediatek/fdt_reset.h>
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/*
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* Loop through all the tuples in the resets= property for a device, asserting
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* or deasserting each reset.
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*
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* Be liberal about errors for now: warn about a failure to (de)assert but keep
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* trying with any other resets in the list. Return ENXIO if any errors were
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* found, and let the caller decide whether the problem is fatal.
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*/
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static int
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assert_deassert_all(device_t consumer, boolean_t assert)
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{
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phandle_t rnode;
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device_t resetdev;
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int resetnum, err, i, ncells;
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uint32_t *resets;
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boolean_t anyerrors;
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rnode = ofw_bus_get_node(consumer);
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ncells = OF_getencprop_alloc(rnode, "resets", sizeof(*resets),
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(void **)&resets);
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if (!assert && ncells < 2) {
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device_printf(consumer, "Warning: No resets specified in fdt "
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"data; device may not function.");
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return (ENXIO);
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}
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anyerrors = false;
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for (i = 0; i < ncells; i += 2) {
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resetdev = OF_device_from_xref(resets[i]);
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resetnum = resets[i + 1];
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if (resetdev == NULL) {
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if (!assert)
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device_printf(consumer, "Warning: can not find "
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"driver for reset number %u; device may "
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"not function\n", resetnum);
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anyerrors = true;
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continue;
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}
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if (assert)
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err = FDT_RESET_ASSERT(resetdev, resetnum);
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else
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err = FDT_RESET_DEASSERT(resetdev, resetnum);
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if (err != 0) {
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if (!assert)
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device_printf(consumer, "Warning: failed to "
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"deassert reset number %u; device may not "
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"function\n", resetnum);
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anyerrors = true;
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}
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}
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free(resets, M_OFWPROP);
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return (anyerrors ? ENXIO : 0);
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}
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int
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fdt_reset_assert_all(device_t consumer)
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{
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return (assert_deassert_all(consumer, true));
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}
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int
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fdt_reset_deassert_all(device_t consumer)
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{
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return (assert_deassert_all(consumer, false));
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}
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void
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fdt_reset_register_provider(device_t provider)
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{
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OF_device_register_xref(
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OF_xref_from_node(ofw_bus_get_node(provider)), provider);
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}
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void
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fdt_reset_unregister_provider(device_t provider)
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{
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OF_device_register_xref(OF_xref_from_device(provider), NULL);
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}
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