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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2013 Xilinx, Inc.
4 */
5#include <command.h>
6#include <clk.h>
7#include <dm.h>
8#include <dm/device.h>
9#include <dm/root.h>
10#include <dm/device-internal.h>
11#include <linux/clk-provider.h>
12
13static void show_clks(struct udevice *dev, int depth, int last_flag)
14{
15 int i, is_last;
16 struct udevice *child;
17 struct clk *clkp, *parent;
18 u32 rate;
19
20 clkp = dev_get_clk_ptr(dev);
21 if (clkp) {
22 parent = clk_get_parent(clkp);
23 if (!IS_ERR(parent) && depth == -1)
24 return;
25 depth++;
26 rate = clk_get_rate(clkp);
27
28 printf(" %-12u %8d ", rate, clkp->enable_count);
29
30 for (i = depth; i >= 0; i--) {
31 is_last = (last_flag >> i) & 1;
32 if (i) {
33 if (is_last)
34 printf(" ");
35 else
36 printf("| ");
37 } else {
38 if (is_last)
39 printf("`-- ");
40 else
41 printf("|-- ");
42 }
43 }
44
45 printf("%s\n", dev->name);
46 }
47
48 device_foreach_child_probe(child, dev) {
49 if (device_get_uclass_id(child) != UCLASS_CLK)
50 continue;
51 if (child == dev)
52 continue;
53 is_last = list_is_last(&child->sibling_node, &dev->child_head);
54 show_clks(child, depth, (last_flag << 1) | is_last);
55 }
56}
57
58static int soc_clk_dump(void)
59{
60 struct udevice *dev;
61 const struct clk_ops *ops;
62
63 printf(" Rate Usecnt Name\n");
64 printf("------------------------------------------\n");
65
66 uclass_foreach_dev_probe(UCLASS_CLK, dev)
67 show_clks(dev, -1, 0);
68
69 uclass_foreach_dev_probe(UCLASS_CLK, dev) {
70 ops = dev_get_driver_ops(dev);
71 if (ops && ops->dump) {
72 printf("\n%s %s:\n", dev->driver->name, dev->name);
73 ops->dump(dev);
74 }
75 }
76
77 return 0;
78}
79
80static int do_clk_dump(struct cmd_tbl *cmdtp, int flag, int argc,
81 char *const argv[])
82{
83 int ret;
84
85 ret = soc_clk_dump();
86 if (ret < 0) {
87 printf("Clock dump error %d\n", ret);
88 ret = CMD_RET_FAILURE;
89 }
90
91 return ret;
92}
93
94static int do_clk_setfreq(struct cmd_tbl *cmdtp, int flag, int argc,
95 char *const argv[])
96{
97 struct clk *clk = NULL;
98 s32 freq;
99 struct udevice *dev;
100
101 if (argc != 3)
102 return CMD_RET_USAGE;
103
104 freq = dectoul(argv[2], NULL);
105
106 if (!uclass_get_device_by_name(UCLASS_CLK, argv[1], &dev))
107 clk = dev_get_clk_ptr(dev);
108
109 if (!clk) {
110 printf("clock '%s' not found.\n", argv[1]);
111 return CMD_RET_FAILURE;
112 }
113
114 freq = clk_set_rate(clk, freq);
115 if (freq < 0) {
116 printf("set_rate failed: %d\n", freq);
117 return CMD_RET_FAILURE;
118 }
119
120 printf("set_rate returns %u\n", freq);
121 return 0;
122}
123
124static struct cmd_tbl cmd_clk_sub[] = {
125 U_BOOT_CMD_MKENT(dump, 1, 1, do_clk_dump, "", ""),
126 U_BOOT_CMD_MKENT(setfreq, 3, 1, do_clk_setfreq, "", ""),
127};
128
129static int do_clk(struct cmd_tbl *cmdtp, int flag, int argc,
130 char *const argv[])
131{
132 struct cmd_tbl *c;
133
134 if (argc < 2)
135 return CMD_RET_USAGE;
136
137 /* Strip off leading 'clk' command argument */
138 argc--;
139 argv++;
140
141 c = find_cmd_tbl(argv[0], &cmd_clk_sub[0], ARRAY_SIZE(cmd_clk_sub));
142
143 if (c)
144 return c->cmd(cmdtp, flag, argc, argv);
145 else
146 return CMD_RET_USAGE;
147}
148
149U_BOOT_LONGHELP(clk,
150 "dump - Print clock frequencies\n"
151 "clk setfreq [clk] [freq] - Set clock frequency");
152
153U_BOOT_CMD(clk, 4, 1, do_clk, "CLK sub-system", clk_help_text);