1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/conf.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/systm.h>
39 #include <sys/libkern.h>
40 #include <sys/types.h>
41 #include <sys/malloc.h>
42
43 #include <machine/bus.h>
44 #include <dev/fdt/simplebus.h>
45
46 #include <dev/extres/clk/clk_mux.h>
47 #include <dev/ofw/ofw_bus.h>
48 #include <dev/ofw/ofw_bus_subr.h>
49
50 #include "clock_common.h"
51
52 #if 0
53 #define DPRINTF(dev, msg...) device_printf(dev, msg)
54 #else
55 #define DPRINTF(dev, msg...)
56 #endif
57
58 void
59 read_clock_cells(device_t dev, struct clock_cell_info *clk) {
60 ssize_t numbytes_clocks;
61 phandle_t node, parent, *cells;
62 int index, ncells, rv;
63
64 node = ofw_bus_get_node(dev);
65
66 /* Get names of parent clocks */
67 numbytes_clocks = OF_getproplen(node, "clocks");
68 clk->num_clock_cells = numbytes_clocks / sizeof(cell_t);
69
70 /* Allocate space and get clock cells content */
71 /* clock_cells / clock_cells_ncells will be freed in
72 * find_parent_clock_names()
73 */
74 clk->clock_cells = malloc(numbytes_clocks, M_DEVBUF, M_WAITOK|M_ZERO);
75 clk->clock_cells_ncells = malloc(clk->num_clock_cells*sizeof(uint8_t),
76 M_DEVBUF, M_WAITOK|M_ZERO);
77 OF_getencprop(node, "clocks", clk->clock_cells, numbytes_clocks);
78
79 /* Count number of clocks */
80 clk->num_real_clocks = 0;
81 for (index = 0; index < clk->num_clock_cells; index++) {
82 rv = ofw_bus_parse_xref_list_alloc(node, "clocks", "#clock-cells",
83 clk->num_real_clocks, &parent, &ncells, &cells);
84 if (rv != 0)
85 continue;
86
87 if (cells != NULL)
88 OF_prop_free(cells);
89
90 clk->clock_cells_ncells[index] = ncells;
91 index += ncells;
92 clk->num_real_clocks++;
93 }
94 }
95
96 int
97 find_parent_clock_names(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) {
98 int index, clock_index, err;
99 bool found_all = true;
100 clk_t parent;
101
102 /* Figure out names */
103 for (index = 0, clock_index = 0; index < clk->num_clock_cells; index++) {
104 /* Get name of parent clock */
105 err = clk_get_by_ofw_index(dev, 0, clock_index, &parent);
106 if (err != 0) {
107 clock_index++;
108 found_all = false;
109 DPRINTF(dev, "Failed to find clock_cells[%d]=0x%x\n",
110 index, clk->clock_cells[index]);
111
112 index += clk->clock_cells_ncells[index];
113 continue;
114 }
115
116 def->parent_names[clock_index] = clk_get_name(parent);
117 clk_release(parent);
118
119 DPRINTF(dev, "Found parent clock[%d/%d]: %s\n",
120 clock_index, clk->num_real_clocks,
121 def->parent_names[clock_index]);
122
123 clock_index++;
124 index += clk->clock_cells_ncells[index];
125 }
126
127 if (!found_all) {
128 return 1;
129 }
130
131 free(clk->clock_cells, M_DEVBUF);
132 free(clk->clock_cells_ncells, M_DEVBUF);
133 return 0;
134 }
135
136 void
137 create_clkdef(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) {
138 def->id = 1;
139
140 clk_parse_ofw_clk_name(dev, ofw_bus_get_node(dev), &def->name);
141
142 DPRINTF(dev, "node name: %s\n", def->name);
143
144 def->parent_cnt = clk->num_real_clocks;
145 def->parent_names = malloc(clk->num_real_clocks*sizeof(char *),
146 M_OFWPROP, M_WAITOK);
147 }
148 void
149 free_clkdef(struct clknode_init_def *def) {
150 OF_prop_free(__DECONST(char *, def->name));
151 OF_prop_free(def->parent_names);
152 }
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