fdt_clock.c revision 1.1.18.2
1 1.1.18.2 jdolecek /* $NetBSD: fdt_clock.c,v 1.1.18.2 2017/12/03 11:37:01 jdolecek Exp $ */ 2 1.1.18.2 jdolecek 3 1.1.18.2 jdolecek /*- 4 1.1.18.2 jdolecek * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.1.18.2 jdolecek * All rights reserved. 6 1.1.18.2 jdolecek * 7 1.1.18.2 jdolecek * Redistribution and use in source and binary forms, with or without 8 1.1.18.2 jdolecek * modification, are permitted provided that the following conditions 9 1.1.18.2 jdolecek * are met: 10 1.1.18.2 jdolecek * 1. Redistributions of source code must retain the above copyright 11 1.1.18.2 jdolecek * notice, this list of conditions and the following disclaimer. 12 1.1.18.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.18.2 jdolecek * notice, this list of conditions and the following disclaimer in the 14 1.1.18.2 jdolecek * documentation and/or other materials provided with the distribution. 15 1.1.18.2 jdolecek * 16 1.1.18.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1.18.2 jdolecek * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1.18.2 jdolecek * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.18.2 jdolecek * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1.18.2 jdolecek * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.1.18.2 jdolecek * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.1.18.2 jdolecek * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.1.18.2 jdolecek * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.1.18.2 jdolecek * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.18.2 jdolecek * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.18.2 jdolecek * SUCH DAMAGE. 27 1.1.18.2 jdolecek */ 28 1.1.18.2 jdolecek 29 1.1.18.2 jdolecek #include <sys/cdefs.h> 30 1.1.18.2 jdolecek __KERNEL_RCSID(0, "$NetBSD: fdt_clock.c,v 1.1.18.2 2017/12/03 11:37:01 jdolecek Exp $"); 31 1.1.18.2 jdolecek 32 1.1.18.2 jdolecek #include <sys/param.h> 33 1.1.18.2 jdolecek #include <sys/bus.h> 34 1.1.18.2 jdolecek #include <sys/kmem.h> 35 1.1.18.2 jdolecek 36 1.1.18.2 jdolecek #include <libfdt.h> 37 1.1.18.2 jdolecek #include <dev/fdt/fdtvar.h> 38 1.1.18.2 jdolecek 39 1.1.18.2 jdolecek struct fdtbus_clock_controller { 40 1.1.18.2 jdolecek device_t cc_dev; 41 1.1.18.2 jdolecek int cc_phandle; 42 1.1.18.2 jdolecek const struct fdtbus_clock_controller_func *cc_funcs; 43 1.1.18.2 jdolecek 44 1.1.18.2 jdolecek struct fdtbus_clock_controller *cc_next; 45 1.1.18.2 jdolecek }; 46 1.1.18.2 jdolecek 47 1.1.18.2 jdolecek static struct fdtbus_clock_controller *fdtbus_cc = NULL; 48 1.1.18.2 jdolecek 49 1.1.18.2 jdolecek int 50 1.1.18.2 jdolecek fdtbus_register_clock_controller(device_t dev, int phandle, 51 1.1.18.2 jdolecek const struct fdtbus_clock_controller_func *funcs) 52 1.1.18.2 jdolecek { 53 1.1.18.2 jdolecek struct fdtbus_clock_controller *cc; 54 1.1.18.2 jdolecek 55 1.1.18.2 jdolecek cc = kmem_alloc(sizeof(*cc), KM_SLEEP); 56 1.1.18.2 jdolecek cc->cc_dev = dev; 57 1.1.18.2 jdolecek cc->cc_phandle = phandle; 58 1.1.18.2 jdolecek cc->cc_funcs = funcs; 59 1.1.18.2 jdolecek 60 1.1.18.2 jdolecek cc->cc_next = fdtbus_cc; 61 1.1.18.2 jdolecek fdtbus_cc = cc; 62 1.1.18.2 jdolecek 63 1.1.18.2 jdolecek return 0; 64 1.1.18.2 jdolecek } 65 1.1.18.2 jdolecek 66 1.1.18.2 jdolecek static struct fdtbus_clock_controller * 67 1.1.18.2 jdolecek fdtbus_get_clock_controller(int phandle) 68 1.1.18.2 jdolecek { 69 1.1.18.2 jdolecek struct fdtbus_clock_controller *cc; 70 1.1.18.2 jdolecek 71 1.1.18.2 jdolecek for (cc = fdtbus_cc; cc; cc = cc->cc_next) { 72 1.1.18.2 jdolecek if (cc->cc_phandle == phandle) { 73 1.1.18.2 jdolecek return cc; 74 1.1.18.2 jdolecek } 75 1.1.18.2 jdolecek } 76 1.1.18.2 jdolecek 77 1.1.18.2 jdolecek return NULL; 78 1.1.18.2 jdolecek } 79 1.1.18.2 jdolecek 80 1.1.18.2 jdolecek struct clk * 81 1.1.18.2 jdolecek fdtbus_clock_get_index(int phandle, u_int index) 82 1.1.18.2 jdolecek { 83 1.1.18.2 jdolecek struct fdtbus_clock_controller *cc; 84 1.1.18.2 jdolecek struct clk *clk = NULL; 85 1.1.18.2 jdolecek uint32_t *clocks = NULL; 86 1.1.18.2 jdolecek uint32_t *p; 87 1.1.18.2 jdolecek u_int n, clock_cells; 88 1.1.18.2 jdolecek int len, resid; 89 1.1.18.2 jdolecek 90 1.1.18.2 jdolecek len = OF_getproplen(phandle, "clocks"); 91 1.1.18.2 jdolecek if (len <= 0) 92 1.1.18.2 jdolecek return NULL; 93 1.1.18.2 jdolecek 94 1.1.18.2 jdolecek clocks = kmem_alloc(len, KM_SLEEP); 95 1.1.18.2 jdolecek if (OF_getprop(phandle, "clocks", clocks, len) != len) { 96 1.1.18.2 jdolecek kmem_free(clocks, len); 97 1.1.18.2 jdolecek return NULL; 98 1.1.18.2 jdolecek } 99 1.1.18.2 jdolecek 100 1.1.18.2 jdolecek p = clocks; 101 1.1.18.2 jdolecek for (n = 0, resid = len; resid > 0; n++) { 102 1.1.18.2 jdolecek const int cc_phandle = 103 1.1.18.2 jdolecek fdtbus_get_phandle_from_native(be32toh(p[0])); 104 1.1.18.2 jdolecek if (of_getprop_uint32(cc_phandle, "#clock-cells", &clock_cells)) 105 1.1.18.2 jdolecek break; 106 1.1.18.2 jdolecek if (n == index) { 107 1.1.18.2 jdolecek cc = fdtbus_get_clock_controller(cc_phandle); 108 1.1.18.2 jdolecek if (cc == NULL) 109 1.1.18.2 jdolecek goto done; 110 1.1.18.2 jdolecek clk = cc->cc_funcs->decode(cc->cc_dev, 111 1.1.18.2 jdolecek clock_cells > 0 ? &p[1] : NULL, clock_cells * 4); 112 1.1.18.2 jdolecek break; 113 1.1.18.2 jdolecek } 114 1.1.18.2 jdolecek resid -= (clock_cells + 1) * 4; 115 1.1.18.2 jdolecek p += clock_cells + 1; 116 1.1.18.2 jdolecek } 117 1.1.18.2 jdolecek 118 1.1.18.2 jdolecek done: 119 1.1.18.2 jdolecek if (clocks) 120 1.1.18.2 jdolecek kmem_free(clocks, len); 121 1.1.18.2 jdolecek 122 1.1.18.2 jdolecek return clk; 123 1.1.18.2 jdolecek } 124 1.1.18.2 jdolecek 125 1.1.18.2 jdolecek struct clk * 126 1.1.18.2 jdolecek fdtbus_clock_get(int phandle, const char *clkname) 127 1.1.18.2 jdolecek { 128 1.1.18.2 jdolecek struct clk *clk = NULL; 129 1.1.18.2 jdolecek char *clock_names = NULL; 130 1.1.18.2 jdolecek const char *p; 131 1.1.18.2 jdolecek u_int index; 132 1.1.18.2 jdolecek int len, resid; 133 1.1.18.2 jdolecek 134 1.1.18.2 jdolecek len = OF_getproplen(phandle, "clock-names"); 135 1.1.18.2 jdolecek if (len <= 0) 136 1.1.18.2 jdolecek return NULL; 137 1.1.18.2 jdolecek 138 1.1.18.2 jdolecek clock_names = kmem_alloc(len, KM_SLEEP); 139 1.1.18.2 jdolecek if (OF_getprop(phandle, "clock-names", clock_names, len) != len) { 140 1.1.18.2 jdolecek kmem_free(clock_names, len); 141 1.1.18.2 jdolecek return NULL; 142 1.1.18.2 jdolecek } 143 1.1.18.2 jdolecek 144 1.1.18.2 jdolecek p = clock_names; 145 1.1.18.2 jdolecek for (index = 0, resid = len; resid > 0; index++) { 146 1.1.18.2 jdolecek if (strcmp(p, clkname) == 0) { 147 1.1.18.2 jdolecek clk = fdtbus_clock_get_index(phandle, index); 148 1.1.18.2 jdolecek break; 149 1.1.18.2 jdolecek } 150 1.1.18.2 jdolecek resid -= strlen(p); 151 1.1.18.2 jdolecek p += strlen(p) + 1; 152 1.1.18.2 jdolecek } 153 1.1.18.2 jdolecek 154 1.1.18.2 jdolecek if (clock_names) 155 1.1.18.2 jdolecek kmem_free(clock_names, len); 156 1.1.18.2 jdolecek 157 1.1.18.2 jdolecek return clk; 158 1.1.18.2 jdolecek } 159
Indexes created Tue Sep 30 20:09:53 GMT 2025