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