1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se> 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 ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * 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/cdefs.h> 29 #include <sys/param.h> 30 #include <sys/conf.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/systm.h> 35 #include <sys/libkern.h> 36 #include <sys/types.h> 37 #include <sys/malloc.h> 38 39 #include <machine/bus.h> 40 #include <dev/fdt/simplebus.h> 41 42 #include <dev/extres/clk/clk_mux.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include "clock_common.h" 47 48 #if 0 49 #define DPRINTF(dev, msg...) device_printf(dev, msg) 50 #else 51 #define DPRINTF(dev, msg...) 52 #endif 53 54 void 55 read_clock_cells(device_t dev, struct clock_cell_info *clk) { 56 ssize_t numbytes_clocks; 57 phandle_t node, parent, *cells; 58 int index, ncells, rv; 59 60 node = ofw_bus_get_node(dev); 61 62 /* Get names of parent clocks */ 63 numbytes_clocks = OF_getproplen(node, "clocks"); 64 clk->num_clock_cells = numbytes_clocks / sizeof(cell_t); 65 66 /* Allocate space and get clock cells content */ 67 /* clock_cells / clock_cells_ncells will be freed in 68 * find_parent_clock_names() 69 */ 70 clk->clock_cells = malloc(numbytes_clocks, M_DEVBUF, M_WAITOK|M_ZERO); 71 clk->clock_cells_ncells = malloc(clk->num_clock_cells*sizeof(uint8_t), 72 M_DEVBUF, M_WAITOK|M_ZERO); 73 OF_getencprop(node, "clocks", clk->clock_cells, numbytes_clocks); 74 75 /* Count number of clocks */ 76 clk->num_real_clocks = 0; 77 for (index = 0; index < clk->num_clock_cells; index++) { 78 rv = ofw_bus_parse_xref_list_alloc(node, "clocks", "#clock-cells", 79 clk->num_real_clocks, &parent, &ncells, &cells); 80 if (rv != 0) 81 continue; 82 83 if (cells != NULL) 84 OF_prop_free(cells); 85 86 clk->clock_cells_ncells[index] = ncells; 87 index += ncells; 88 clk->num_real_clocks++; 89 } 90 } 91 92 int 93 find_parent_clock_names(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) { 94 int index, clock_index, err; 95 bool found_all = true; 96 clk_t parent; 97 98 /* Figure out names */ 99 for (index = 0, clock_index = 0; index < clk->num_clock_cells; index++) { 100 /* Get name of parent clock */ 101 err = clk_get_by_ofw_index(dev, 0, clock_index, &parent); 102 if (err != 0) { 103 clock_index++; 104 found_all = false; 105 DPRINTF(dev, "Failed to find clock_cells[%d]=0x%x\n", 106 index, clk->clock_cells[index]); 107 108 index += clk->clock_cells_ncells[index]; 109 continue; 110 } 111 112 def->parent_names[clock_index] = clk_get_name(parent); 113 clk_release(parent); 114 115 DPRINTF(dev, "Found parent clock[%d/%d]: %s\n", 116 clock_index, clk->num_real_clocks, 117 def->parent_names[clock_index]); 118 119 clock_index++; 120 index += clk->clock_cells_ncells[index]; 121 } 122 123 if (!found_all) { 124 return 1; 125 } 126 127 free(clk->clock_cells, M_DEVBUF); 128 free(clk->clock_cells_ncells, M_DEVBUF); 129 return 0; 130 } 131 132 void 133 create_clkdef(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) { 134 def->id = 1; 135 136 clk_parse_ofw_clk_name(dev, ofw_bus_get_node(dev), &def->name); 137 138 DPRINTF(dev, "node name: %s\n", def->name); 139 140 def->parent_cnt = clk->num_real_clocks; 141 def->parent_names = malloc(clk->num_real_clocks*sizeof(char *), 142 M_OFWPROP, M_WAITOK); 143 } 144 void 145 free_clkdef(struct clknode_init_def *def) { 146 OF_prop_free(__DECONST(char *, def->name)); 147 OF_prop_free(def->parent_names); 148 } 149