1 /* SPDX-License-Identifier: Apache-2.0 */
2 /*
3 * Copyright (c) 2023 Intel Corporation
4 *
5 * Author: Adrian Warecki <adrian.warecki@intel.com>
6 */
7
8 #include <zephyr/drivers/watchdog.h>
9 #include <zephyr/logging/log.h>
10 #include <zephyr/sys_clock.h>
11 #include <zephyr/math/ilog2.h>
12
13 #include "wdt_dw_common.h"
14 #include "wdt_dw.h"
15
16 LOG_MODULE_REGISTER(wdt_dw_common, CONFIG_WDT_LOG_LEVEL);
17
18 #define WDT_DW_FLAG_CONFIGURED 0x80000000
19
dw_wdt_check_options(const uint8_t options)20 int dw_wdt_check_options(const uint8_t options)
21 {
22 if (options & WDT_OPT_PAUSE_HALTED_BY_DBG) {
23 LOG_ERR("Pausing watchdog by debugger is not supported.");
24 return -ENOTSUP;
25 }
26
27 if (options & WDT_OPT_PAUSE_IN_SLEEP) {
28 LOG_ERR("Pausing watchdog in sleep is not supported.");
29 return -ENOTSUP;
30 }
31
32 return 0;
33 }
34
dw_wdt_configure(const uint32_t base,const uint32_t config)35 int dw_wdt_configure(const uint32_t base, const uint32_t config)
36 {
37 uint32_t period;
38
39 if (!(config & WDT_DW_FLAG_CONFIGURED)) {
40 LOG_ERR("Timeout not installed.");
41 return -ENOTSUP;
42 }
43
44 /* Configure timeout */
45 period = config & ~WDT_DW_FLAG_CONFIGURED;
46
47 if (dw_wdt_dual_timeout_period_get(base)) {
48 dw_wdt_timeout_period_init_set(base, period);
49 }
50
51 dw_wdt_timeout_period_set(base, period);
52
53 /* Enable watchdog */
54 dw_wdt_enable(base);
55 dw_wdt_counter_restart(base);
56
57 return 0;
58 }
59
dw_wdt_calc_period(const uint32_t base,const uint32_t clk_freq,const struct wdt_timeout_cfg * config,uint32_t * period_out)60 int dw_wdt_calc_period(const uint32_t base, const uint32_t clk_freq,
61 const struct wdt_timeout_cfg *config, uint32_t *period_out)
62 {
63 uint64_t period64;
64 uint32_t period;
65
66 /* Window timeout is not supported by this driver */
67 if (config->window.min) {
68 LOG_ERR("Window timeout is not supported.");
69 return -ENOTSUP;
70 }
71
72 period64 = (uint64_t)clk_freq * config->window.max;
73 period64 /= 1000;
74 if (!period64 || (period64 >> 31)) {
75 LOG_ERR("Window max is out of range.");
76 return -EINVAL;
77 }
78
79 period = period64 - 1;
80 period = ilog2(period);
81
82 if (period >= dw_wdt_cnt_width_get(base)) {
83 LOG_ERR("Watchdog timeout too long.");
84 return -EINVAL;
85 }
86
87 /* The minimum counter value is 64k, maximum 2G */
88 *period_out = WDT_DW_FLAG_CONFIGURED | (period >= 15 ? period - 15 : 0);
89 return 0;
90 }
91
dw_wdt_probe(const uint32_t base,const uint32_t reset_pulse_length)92 int dw_wdt_probe(const uint32_t base, const uint32_t reset_pulse_length)
93 {
94 /* Check component type */
95 const uint32_t type = dw_wdt_comp_type_get(base);
96
97 if (type != WDT_COMP_TYPE_VALUE) {
98 LOG_ERR("Invalid component type %x", type);
99 return -ENODEV;
100 }
101
102 dw_wdt_reset_pulse_length_set(base, reset_pulse_length);
103
104 return 0;
105 }
106
dw_wdt_disable(const struct device * dev)107 int dw_wdt_disable(const struct device *dev)
108 {
109 return -ENOTSUP;
110 }
111
