1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/resource.h> 37 38 #include <dev/ofw/ofw_bus.h> 39 #include <dev/ofw/ofw_bus_subr.h> 40 41 #include <dev/pwm/ofw_pwm.h> 42 43 int 44 pwm_get_by_ofw_propidx(device_t consumer, phandle_t node, 45 const char *prop_name, int idx, pwm_channel_t *out_channel) 46 { 47 phandle_t xref; 48 pcell_t *cells; 49 struct pwm_channel channel; 50 int ncells, rv; 51 52 rv = ofw_bus_parse_xref_list_alloc(node, prop_name, "#pwm-cells", 53 idx, &xref, &ncells, &cells); 54 if (rv != 0) 55 return (rv); 56 57 channel.dev = OF_device_from_xref(xref); 58 if (channel.dev == NULL) { 59 OF_prop_free(cells); 60 return (ENODEV); 61 } 62 63 channel.channel = cells[0]; 64 channel.period = cells[1]; 65 66 if (ncells >= 3) 67 channel.flags = cells[2]; 68 69 *out_channel = malloc(sizeof(struct pwm_channel), M_DEVBUF, M_WAITOK | M_ZERO); 70 **out_channel = channel; 71 return (0); 72 } 73 74 int 75 pwm_get_by_ofw_idx(device_t consumer, phandle_t node, int idx, 76 pwm_channel_t *out_channel) 77 { 78 79 return (pwm_get_by_ofw_propidx(consumer, node, "pwms", idx, out_channel)); 80 } 81 82 int 83 pwm_get_by_ofw_property(device_t consumer, phandle_t node, 84 const char *prop_name, pwm_channel_t *out_channel) 85 { 86 87 return (pwm_get_by_ofw_propidx(consumer, node, prop_name, 0, out_channel)); 88 } 89 90 int 91 pwm_get_by_ofw_name(device_t consumer, phandle_t node, const char *name, 92 pwm_channel_t *out_channel) 93 { 94 int rv, idx; 95 96 rv = ofw_bus_find_string_index(node, "pwm-names", name, &idx); 97 if (rv != 0) 98 return (rv); 99 100 return (pwm_get_by_ofw_idx(consumer, node, idx, out_channel)); 101 } 102