168 lines
4.4 KiB
C
168 lines
4.4 KiB
C
/* $NetBSD: fdt_reset.c,v 1.4 2019/02/27 16:56:00 jakllsch Exp $ */
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/*-
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* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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__KERNEL_RCSID(0, "$NetBSD: fdt_reset.c,v 1.4 2019/02/27 16:56:00 jakllsch Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kmem.h>
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#include <sys/queue.h>
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#include <libfdt.h>
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#include <dev/fdt/fdtvar.h>
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struct fdtbus_reset_controller {
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device_t rc_dev;
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int rc_phandle;
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const struct fdtbus_reset_controller_func *rc_funcs;
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LIST_ENTRY(fdtbus_reset_controller) rc_next;
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};
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static LIST_HEAD(, fdtbus_reset_controller) fdtbus_reset_controllers =
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LIST_HEAD_INITIALIZER(fdtbus_reset_controllers);
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int
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fdtbus_register_reset_controller(device_t dev, int phandle,
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const struct fdtbus_reset_controller_func *funcs)
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{
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struct fdtbus_reset_controller *rc;
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rc = kmem_alloc(sizeof(*rc), KM_SLEEP);
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rc->rc_dev = dev;
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rc->rc_phandle = phandle;
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rc->rc_funcs = funcs;
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LIST_INSERT_HEAD(&fdtbus_reset_controllers, rc, rc_next);
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return 0;
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}
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static struct fdtbus_reset_controller *
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fdtbus_get_reset_controller(int phandle)
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{
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struct fdtbus_reset_controller *rc;
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LIST_FOREACH(rc, &fdtbus_reset_controllers, rc_next) {
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if (rc->rc_phandle == phandle)
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return rc;
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}
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return NULL;
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}
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struct fdtbus_reset *
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fdtbus_reset_get_index(int phandle, u_int index)
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{
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struct fdtbus_reset_controller *rc;
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struct fdtbus_reset *rst = NULL;
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void *rst_priv = NULL;
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uint32_t *resets = NULL;
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uint32_t *p;
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u_int n, reset_cells;
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int len, resid;
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len = OF_getproplen(phandle, "resets");
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if (len <= 0)
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return NULL;
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resets = kmem_alloc(len, KM_SLEEP);
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if (OF_getprop(phandle, "resets", resets, len) != len) {
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kmem_free(resets, len);
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return NULL;
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}
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p = resets;
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for (n = 0, resid = len; resid > 0; n++) {
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const int rc_phandle =
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fdtbus_get_phandle_from_native(be32toh(p[0]));
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if (of_getprop_uint32(rc_phandle, "#reset-cells", &reset_cells))
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break;
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if (n == index) {
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rc = fdtbus_get_reset_controller(rc_phandle);
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if (rc == NULL)
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goto done;
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rst_priv = rc->rc_funcs->acquire(rc->rc_dev,
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reset_cells > 0 ? &p[1] : NULL, reset_cells * 4);
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if (rst_priv) {
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rst = kmem_alloc(sizeof(*rst), KM_SLEEP);
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rst->rst_rc = rc;
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rst->rst_priv = rst_priv;
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}
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break;
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}
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resid -= (reset_cells + 1) * 4;
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p += reset_cells + 1;
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}
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done:
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if (resets)
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kmem_free(resets, len);
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return rst;
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}
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struct fdtbus_reset *
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fdtbus_reset_get(int phandle, const char *rstname)
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{
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u_int index;
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int err;
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err = fdtbus_get_index(phandle, "reset-names", rstname, &index);
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if (err != 0)
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return NULL;
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return fdtbus_reset_get_index(phandle, index);
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}
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void
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fdtbus_reset_put(struct fdtbus_reset *rst)
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{
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struct fdtbus_reset_controller *rc = rst->rst_rc;
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rc->rc_funcs->release(rc->rc_dev, rst->rst_priv);
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kmem_free(rst, sizeof(*rst));
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}
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int
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fdtbus_reset_assert(struct fdtbus_reset *rst)
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{
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struct fdtbus_reset_controller *rc = rst->rst_rc;
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return rc->rc_funcs->reset_assert(rc->rc_dev, rst->rst_priv);
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}
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int
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fdtbus_reset_deassert(struct fdtbus_reset *rst)
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{
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struct fdtbus_reset_controller *rc = rst->rst_rc;
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return rc->rc_funcs->reset_deassert(rc->rc_dev, rst->rst_priv);
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}
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