fdt_pwm.c revision 1.1.2.2
1 1.1.2.2 pgoyette /* $NetBSD: fdt_pwm.c,v 1.1.2.2 2018/05/21 04:36:05 pgoyette Exp $ */ 2 1.1.2.2 pgoyette 3 1.1.2.2 pgoyette /*- 4 1.1.2.2 pgoyette * Copyright (c) 2018 Jared McNeill <jmcneill (at) invisible.ca> 5 1.1.2.2 pgoyette * All rights reserved. 6 1.1.2.2 pgoyette * 7 1.1.2.2 pgoyette * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 pgoyette * modification, are permitted provided that the following conditions 9 1.1.2.2 pgoyette * are met: 10 1.1.2.2 pgoyette * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 pgoyette * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 pgoyette * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 pgoyette * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 pgoyette * documentation and/or other materials provided with the distribution. 15 1.1.2.2 pgoyette * 16 1.1.2.2 pgoyette * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1.2.2 pgoyette * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1.2.2 pgoyette * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.2.2 pgoyette * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1.2.2 pgoyette * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.1.2.2 pgoyette * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.1.2.2 pgoyette * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.1.2.2 pgoyette * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.1.2.2 pgoyette * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 pgoyette * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 pgoyette * SUCH DAMAGE. 27 1.1.2.2 pgoyette */ 28 1.1.2.2 pgoyette 29 1.1.2.2 pgoyette #include <sys/cdefs.h> 30 1.1.2.2 pgoyette __KERNEL_RCSID(0, "$NetBSD: fdt_pwm.c,v 1.1.2.2 2018/05/21 04:36:05 pgoyette Exp $"); 31 1.1.2.2 pgoyette 32 1.1.2.2 pgoyette #include <sys/param.h> 33 1.1.2.2 pgoyette #include <sys/bus.h> 34 1.1.2.2 pgoyette #include <sys/kmem.h> 35 1.1.2.2 pgoyette 36 1.1.2.2 pgoyette #include <libfdt.h> 37 1.1.2.2 pgoyette #include <dev/fdt/fdtvar.h> 38 1.1.2.2 pgoyette 39 1.1.2.2 pgoyette struct fdtbus_pwm_controller { 40 1.1.2.2 pgoyette device_t pc_dev; 41 1.1.2.2 pgoyette int pc_phandle; 42 1.1.2.2 pgoyette const struct fdtbus_pwm_controller_func *pc_funcs; 43 1.1.2.2 pgoyette 44 1.1.2.2 pgoyette struct fdtbus_pwm_controller *pc_next; 45 1.1.2.2 pgoyette }; 46 1.1.2.2 pgoyette 47 1.1.2.2 pgoyette static struct fdtbus_pwm_controller *fdtbus_pc = NULL; 48 1.1.2.2 pgoyette 49 1.1.2.2 pgoyette int 50 1.1.2.2 pgoyette fdtbus_register_pwm_controller(device_t dev, int phandle, 51 1.1.2.2 pgoyette const struct fdtbus_pwm_controller_func *funcs) 52 1.1.2.2 pgoyette { 53 1.1.2.2 pgoyette struct fdtbus_pwm_controller *pc; 54 1.1.2.2 pgoyette 55 1.1.2.2 pgoyette pc = kmem_alloc(sizeof(*pc), KM_SLEEP); 56 1.1.2.2 pgoyette pc->pc_dev = dev; 57 1.1.2.2 pgoyette pc->pc_phandle = phandle; 58 1.1.2.2 pgoyette pc->pc_funcs = funcs; 59 1.1.2.2 pgoyette 60 1.1.2.2 pgoyette pc->pc_next = fdtbus_pc; 61 1.1.2.2 pgoyette fdtbus_pc = pc; 62 1.1.2.2 pgoyette 63 1.1.2.2 pgoyette return 0; 64 1.1.2.2 pgoyette } 65 1.1.2.2 pgoyette 66 1.1.2.2 pgoyette static struct fdtbus_pwm_controller * 67 1.1.2.2 pgoyette fdtbus_get_pwm_controller(int phandle) 68 1.1.2.2 pgoyette { 69 1.1.2.2 pgoyette struct fdtbus_pwm_controller *pc; 70 1.1.2.2 pgoyette 71 1.1.2.2 pgoyette for (pc = fdtbus_pc; pc; pc = pc->pc_next) { 72 1.1.2.2 pgoyette if (pc->pc_phandle == phandle) { 73 1.1.2.2 pgoyette return pc; 74 1.1.2.2 pgoyette } 75 1.1.2.2 pgoyette } 76 1.1.2.2 pgoyette 77 1.1.2.2 pgoyette return NULL; 78 1.1.2.2 pgoyette } 79 1.1.2.2 pgoyette 80 1.1.2.2 pgoyette pwm_tag_t 81 1.1.2.2 pgoyette fdtbus_pwm_acquire(int phandle, const char *prop) 82 1.1.2.2 pgoyette { 83 1.1.2.2 pgoyette return fdtbus_pwm_acquire_index(phandle, prop, 0); 84 1.1.2.2 pgoyette } 85 1.1.2.2 pgoyette 86 1.1.2.2 pgoyette pwm_tag_t 87 1.1.2.2 pgoyette fdtbus_pwm_acquire_index(int phandle, const char *prop, int index) 88 1.1.2.2 pgoyette { 89 1.1.2.2 pgoyette struct fdtbus_pwm_controller *pc; 90 1.1.2.2 pgoyette const uint32_t *pwms, *p; 91 1.1.2.2 pgoyette u_int n, pwm_cells; 92 1.1.2.2 pgoyette int len, resid; 93 1.1.2.2 pgoyette 94 1.1.2.2 pgoyette pwms = fdtbus_get_prop(phandle, prop, &len); 95 1.1.2.2 pgoyette if (pwms == NULL) 96 1.1.2.2 pgoyette return NULL; 97 1.1.2.2 pgoyette 98 1.1.2.2 pgoyette p = pwms; 99 1.1.2.2 pgoyette for (n = 0, resid = len; resid > 0; n++) { 100 1.1.2.2 pgoyette const int pc_phandle = 101 1.1.2.2 pgoyette fdtbus_get_phandle_from_native(be32toh(p[0])); 102 1.1.2.2 pgoyette if (of_getprop_uint32(pc_phandle, "#pwm-cells", &pwm_cells)) 103 1.1.2.2 pgoyette break; 104 1.1.2.2 pgoyette if (n == index) { 105 1.1.2.2 pgoyette pc = fdtbus_get_pwm_controller(pc_phandle); 106 1.1.2.2 pgoyette if (pc == NULL) 107 1.1.2.2 pgoyette return NULL; 108 1.1.2.2 pgoyette return pc->pc_funcs->get_tag(pc->pc_dev, 109 1.1.2.2 pgoyette &p[0], (pwm_cells + 1) * 4); 110 1.1.2.2 pgoyette } 111 1.1.2.2 pgoyette resid -= (pwm_cells + 1) * 4; 112 1.1.2.2 pgoyette p += pwm_cells + 1; 113 1.1.2.2 pgoyette } 114 1.1.2.2 pgoyette 115 1.1.2.2 pgoyette return NULL; 116 1.1.2.2 pgoyette } 117
Indexes created Wed Oct 01 07:09:59 GMT 2025