117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/* $NetBSD: fdt_pwm.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $ */
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/*-
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* Copyright (c) 2018 Jared 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_pwm.c,v 1.2 2018/06/30 20:34:43 jmcneill 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_pwm_controller {
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device_t pc_dev;
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int pc_phandle;
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const struct fdtbus_pwm_controller_func *pc_funcs;
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LIST_ENTRY(fdtbus_pwm_controller) pc_next;
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};
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static LIST_HEAD(, fdtbus_pwm_controller) fdtbus_pwm_controllers =
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LIST_HEAD_INITIALIZER(fdtbus_pwm_controllers);
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int
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fdtbus_register_pwm_controller(device_t dev, int phandle,
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const struct fdtbus_pwm_controller_func *funcs)
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{
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struct fdtbus_pwm_controller *pc;
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pc = kmem_alloc(sizeof(*pc), KM_SLEEP);
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pc->pc_dev = dev;
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pc->pc_phandle = phandle;
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pc->pc_funcs = funcs;
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LIST_INSERT_HEAD(&fdtbus_pwm_controllers, pc, pc_next);
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return 0;
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}
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static struct fdtbus_pwm_controller *
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fdtbus_get_pwm_controller(int phandle)
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{
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struct fdtbus_pwm_controller *pc;
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LIST_FOREACH(pc, &fdtbus_pwm_controllers, pc_next) {
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if (pc->pc_phandle == phandle)
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return pc;
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}
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return NULL;
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}
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pwm_tag_t
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fdtbus_pwm_acquire(int phandle, const char *prop)
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{
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return fdtbus_pwm_acquire_index(phandle, prop, 0);
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}
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pwm_tag_t
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fdtbus_pwm_acquire_index(int phandle, const char *prop, int index)
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{
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struct fdtbus_pwm_controller *pc;
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const uint32_t *pwms, *p;
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u_int n, pwm_cells;
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int len, resid;
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pwms = fdtbus_get_prop(phandle, prop, &len);
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if (pwms == NULL)
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return NULL;
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p = pwms;
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for (n = 0, resid = len; resid > 0; n++) {
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const int pc_phandle =
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fdtbus_get_phandle_from_native(be32toh(p[0]));
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if (of_getprop_uint32(pc_phandle, "#pwm-cells", &pwm_cells))
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break;
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if (n == index) {
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pc = fdtbus_get_pwm_controller(pc_phandle);
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if (pc == NULL)
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return NULL;
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return pc->pc_funcs->get_tag(pc->pc_dev,
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&p[0], (pwm_cells + 1) * 4);
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}
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resid -= (pwm_cells + 1) * 4;
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p += pwm_cells + 1;
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}
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return NULL;
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}
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