1/*
  2 * Self tests for device tree subsystem
  3 */
  4
  5#define pr_fmt(fmt) "### %s(): " fmt, __func__
  6
  7#include <linux/clk.h>
  8#include <linux/err.h>
  9#include <linux/errno.h>
 10#include <linux/module.h>
 11#include <linux/of.h>
 12#include <linux/list.h>
 13#include <linux/mutex.h>
 14#include <linux/slab.h>
 15#include <linux/device.h>
 16
 17static bool selftest_passed = true;
 18#define selftest(result, fmt, ...) { \
 19	selftest_passed &= (result); \
 20	if (!(result)) \
 21		pr_err("FAIL %s:%i " fmt, __FILE__, __LINE__, ##__VA_ARGS__); \
 22}
 23
 24static void __init of_selftest_parse_phandle_with_args(void)
 25{
 26	struct device_node *np;
 27	struct of_phandle_args args;
 28	int rc, i;
 29	bool passed_all = true;
 30
 31	pr_info("start\n");
 32	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 33	if (!np) {
 34		pr_err("missing testcase data\n");
 35		return;
 36	}
 37
 38	for (i = 0; i < 7; i++) {
 39		bool passed = true;
 40		rc = of_parse_phandle_with_args(np, "phandle-list",
 41						"#phandle-cells", i, &args);
 42
 43		/* Test the values from tests-phandle.dtsi */
 44		switch (i) {
 45		case 0:
 46			passed &= !rc;
 47			passed &= (args.args_count == 1);
 48			passed &= (args.args[0] == (i + 1));
 49			break;
 50		case 1:
 51			passed &= !rc;
 52			passed &= (args.args_count == 2);
 53			passed &= (args.args[0] == (i + 1));
 54			passed &= (args.args[1] == 0);
 55			break;
 56		case 2:
 57			passed &= (rc == -ENOENT);
 58			break;
 59		case 3:
 60			passed &= !rc;
 61			passed &= (args.args_count == 3);
 62			passed &= (args.args[0] == (i + 1));
 63			passed &= (args.args[1] == 4);
 64			passed &= (args.args[2] == 3);
 65			break;
 66		case 4:
 67			passed &= !rc;
 68			passed &= (args.args_count == 2);
 69			passed &= (args.args[0] == (i + 1));
 70			passed &= (args.args[1] == 100);
 71			break;
 72		case 5:
 73			passed &= !rc;
 74			passed &= (args.args_count == 0);
 75			break;
 76		case 6:
 77			passed &= !rc;
 78			passed &= (args.args_count == 1);
 79			passed &= (args.args[0] == (i + 1));
 80			break;
 81		case 7:
 82			passed &= (rc == -EINVAL);
 83			break;
 84		default:
 85			passed = false;
 86		}
 87
 88		if (!passed) {
 89			int j;
 90			pr_err("index %i - data error on node %s rc=%i regs=[",
 91				i, args.np->full_name, rc);
 92			for (j = 0; j < args.args_count; j++)
 93				printk(" %i", args.args[j]);
 94			printk(" ]\n");
 95
 96			passed_all = false;
 97		}
 98	}
 99
100	/* Check for missing list property */
101	rc = of_parse_phandle_with_args(np, "phandle-list-missing",
102					"#phandle-cells", 0, &args);
103	passed_all &= (rc == -EINVAL);
104
105	/* Check for missing cells property */
106	rc = of_parse_phandle_with_args(np, "phandle-list",
107					"#phandle-cells-missing", 0, &args);
108	passed_all &= (rc == -EINVAL);
109
110	/* Check for bad phandle in list */
111	rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
112					"#phandle-cells", 0, &args);
113	passed_all &= (rc == -EINVAL);
114
115	/* Check for incorrectly formed argument list */
116	rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
117					"#phandle-cells", 1, &args);
118	passed_all &= (rc == -EINVAL);
119
120	pr_info("end - %s\n", passed_all ? "PASS" : "FAIL");
121}
122
123static void __init of_selftest_property_match_string(void)
124{
125	struct device_node *np;
126	int rc;
127
128	pr_info("start\n");
129	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
130	if (!np) {
131		pr_err("No testcase data in device tree\n");
132		return;
133	}
134
135	rc = of_property_match_string(np, "phandle-list-names", "first");
136	selftest(rc == 0, "first expected:0 got:%i\n", rc);
137	rc = of_property_match_string(np, "phandle-list-names", "second");
138	selftest(rc == 1, "second expected:0 got:%i\n", rc);
139	rc = of_property_match_string(np, "phandle-list-names", "third");
140	selftest(rc == 2, "third expected:0 got:%i\n", rc);
141	rc = of_property_match_string(np, "phandle-list-names", "fourth");
142	selftest(rc == -ENODATA, "unmatched string; rc=%i", rc);
143	rc = of_property_match_string(np, "missing-property", "blah");
144	selftest(rc == -EINVAL, "missing property; rc=%i", rc);
145	rc = of_property_match_string(np, "empty-property", "blah");
146	selftest(rc == -ENODATA, "empty property; rc=%i", rc);
147	rc = of_property_match_string(np, "unterminated-string", "blah");
148	selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
149}
150
151static int __init of_selftest(void)
152{
153	struct device_node *np;
154
155	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
156	if (!np) {
157		pr_info("No testcase data in device tree; not running tests\n");
158		return 0;
159	}
160	of_node_put(np);
161
162	pr_info("start of selftest - you will see error messages\n");
163	of_selftest_parse_phandle_with_args();
164	of_selftest_property_match_string();
165	pr_info("end of selftest - %s\n", selftest_passed ? "PASS" : "FAIL");
166	return 0;
167}
168late_initcall(of_selftest);