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/param.h> 29 #include <sys/conf.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 #include <sys/systm.h> 34 #include <sys/libkern.h> 35 #include <sys/types.h> 36 #include <sys/malloc.h> 37 38 #include <machine/bus.h> 39 #include <dev/fdt/simplebus.h> 40 41 #include <dev/extres/clk/clk_mux.h> 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include "clock_common.h" 46 47 #if 0 48 #define DPRINTF(dev, msg...) device_printf(dev, msg) 49 #else 50 #define DPRINTF(dev, msg...) 51 #endif 52 53 void 54 read_clock_cells(device_t dev, struct clock_cell_info *clk) { 55 ssize_t numbytes_clocks; 56 phandle_t node, parent, *cells; 57 int index, ncells, rv; 58 59 node = ofw_bus_get_node(dev); 60 61 /* Get names of parent clocks */ 62 numbytes_clocks = OF_getproplen(node, "clocks"); 63 clk->num_clock_cells = numbytes_clocks / sizeof(cell_t); 64 65 /* Allocate space and get clock cells content */ 66 /* clock_cells / clock_cells_ncells will be freed in 67 * find_parent_clock_names() 68 */ 69 clk->clock_cells = malloc(numbytes_clocks, M_DEVBUF, M_WAITOK|M_ZERO); 70 clk->clock_cells_ncells = malloc(clk->num_clock_cells*sizeof(uint8_t), 71 M_DEVBUF, M_WAITOK|M_ZERO); 72 OF_getencprop(node, "clocks", clk->clock_cells, numbytes_clocks); 73 74 /* Count number of clocks */ 75 clk->num_real_clocks = 0; 76 for (index = 0; index < clk->num_clock_cells; index++) { 77 rv = ofw_bus_parse_xref_list_alloc(node, "clocks", "#clock-cells", 78 clk->num_real_clocks, &parent, &ncells, &cells); 79 if (rv != 0) 80 continue; 81 82 if (cells != NULL) 83 OF_prop_free(cells); 84 85 clk->clock_cells_ncells[index] = ncells; 86 index += ncells; 87 clk->num_real_clocks++; 88 } 89 } 90 91 int 92 find_parent_clock_names(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) { 93 int index, clock_index, err; 94 bool found_all = true; 95 clk_t parent; 96 97 /* Figure out names */ 98 for (index = 0, clock_index = 0; index < clk->num_clock_cells; index++) { 99 /* Get name of parent clock */ 100 err = clk_get_by_ofw_index(dev, 0, clock_index, &parent); 101 if (err != 0) { 102 clock_index++; 103 found_all = false; 104 DPRINTF(dev, "Failed to find clock_cells[%d]=0x%x\n", 105 index, clk->clock_cells[index]); 106 107 index += clk->clock_cells_ncells[index]; 108 continue; 109 } 110 111 def->parent_names[clock_index] = clk_get_name(parent); 112 clk_release(parent); 113 114 DPRINTF(dev, "Found parent clock[%d/%d]: %s\n", 115 clock_index, clk->num_real_clocks, 116 def->parent_names[clock_index]); 117 118 clock_index++; 119 index += clk->clock_cells_ncells[index]; 120 } 121 122 if (!found_all) { 123 return 1; 124 } 125 126 free(clk->clock_cells, M_DEVBUF); 127 free(clk->clock_cells_ncells, M_DEVBUF); 128 return 0; 129 } 130 131 void 132 create_clkdef(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) { 133 def->id = 1; 134 135 clk_parse_ofw_clk_name(dev, ofw_bus_get_node(dev), &def->name); 136 137 DPRINTF(dev, "node name: %s\n", def->name); 138 139 def->parent_cnt = clk->num_real_clocks; 140 def->parent_names = malloc(clk->num_real_clocks*sizeof(char *), 141 M_OFWPROP, M_WAITOK); 142 } 143 void 144 free_clkdef(struct clknode_init_def *def) { 145 OF_prop_free(__DECONST(char *, def->name)); 146 OF_prop_free(def->parent_names); 147 } 148