1 // Copyright 2020 Espressif Systems (Shanghai) PTE LTD
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <sys/param.h>
16 #include "soc/soc_caps.h"
17 #include "hal/systimer_hal.h"
18 #include "hal/systimer_ll.h"
19 #include "hal/systimer_types.h"
20 #include "hal/clk_gate_ll.h"
21
22 #define SYSTIMER_TICKS_PER_US (16) // Systimer clock source is fixed to 16MHz
23
systimer_hal_get_counter_value(systimer_counter_id_t counter_id)24 uint64_t systimer_hal_get_counter_value(systimer_counter_id_t counter_id)
25 {
26 uint32_t lo, lo_start, hi;
27 /* Set the "update" bit and wait for acknowledgment */
28 systimer_ll_counter_snapshot(counter_id);
29 while (!systimer_ll_is_counter_value_valid(counter_id));
30 /* Read LO, HI, then LO again, check that LO returns the same value.
31 * This accounts for the case when an interrupt may happen between reading
32 * HI and LO values, and this function may get called from the ISR.
33 * In this case, the repeated read will return consistent values.
34 */
35 lo_start = systimer_ll_get_counter_value_low(counter_id);
36 do {
37 lo = lo_start;
38 hi = systimer_ll_get_counter_value_high(counter_id);
39 lo_start = systimer_ll_get_counter_value_low(counter_id);
40 } while (lo_start != lo);
41
42 systimer_counter_value_t result = {
43 .lo = lo,
44 .hi = hi
45 };
46
47 return result.val;
48 }
49
systimer_hal_get_time(systimer_counter_id_t counter_id)50 uint64_t systimer_hal_get_time(systimer_counter_id_t counter_id)
51 {
52 return systimer_hal_get_counter_value(counter_id) / SYSTIMER_TICKS_PER_US;
53 }
54
systimer_hal_set_alarm_target(systimer_alarm_id_t alarm_id,uint64_t target)55 void systimer_hal_set_alarm_target(systimer_alarm_id_t alarm_id, uint64_t target)
56 {
57 systimer_counter_value_t alarm = { .val = target * SYSTIMER_TICKS_PER_US};
58 systimer_ll_disable_alarm(alarm_id);
59 systimer_ll_set_alarm_target(alarm_id, alarm.val);
60 systimer_ll_apply_alarm_value(alarm_id);
61 systimer_ll_enable_alarm(alarm_id);
62 }
63
systimer_hal_set_alarm_period(systimer_alarm_id_t alarm_id,uint32_t period)64 void systimer_hal_set_alarm_period(systimer_alarm_id_t alarm_id, uint32_t period)
65 {
66 systimer_ll_disable_alarm(alarm_id);
67 systimer_ll_set_alarm_period(alarm_id, period * SYSTIMER_TICKS_PER_US);
68 systimer_ll_apply_alarm_value(alarm_id);
69 systimer_ll_enable_alarm(alarm_id);
70 }
71
systimer_hal_get_alarm_value(systimer_alarm_id_t alarm_id)72 uint64_t systimer_hal_get_alarm_value(systimer_alarm_id_t alarm_id)
73 {
74 return systimer_ll_get_alarm_target(alarm_id);
75 }
76
systimer_hal_enable_alarm_int(systimer_alarm_id_t alarm_id)77 void systimer_hal_enable_alarm_int(systimer_alarm_id_t alarm_id)
78 {
79 systimer_ll_enable_alarm_int(alarm_id);
80 }
81
systimer_hal_on_apb_freq_update(uint32_t apb_ticks_per_us)82 void systimer_hal_on_apb_freq_update(uint32_t apb_ticks_per_us)
83 {
84 /* Nothing to do here, SYSTIMER clock is independent of APB clock */
85 (void)apb_ticks_per_us;
86 }
87
systimer_hal_counter_value_advance(systimer_counter_id_t counter_id,int64_t time_us)88 void systimer_hal_counter_value_advance(systimer_counter_id_t counter_id, int64_t time_us)
89 {
90 systimer_counter_value_t new_count = { .val = systimer_hal_get_counter_value(counter_id) + time_us * SYSTIMER_TICKS_PER_US };
91 systimer_ll_set_counter_value(counter_id, new_count.val);
92 systimer_ll_apply_counter_value(counter_id);
93 }
94
systimer_hal_enable_counter(systimer_counter_id_t counter_id)95 void systimer_hal_enable_counter(systimer_counter_id_t counter_id)
96 {
97 systimer_ll_enable_counter(counter_id);
98 }
99
systimer_hal_init(void)100 void systimer_hal_init(void)
101 {
102 periph_ll_enable_clk_clear_rst(PERIPH_SYSTIMER_MODULE);
103 systimer_ll_enable_clock();
104 }
105
systimer_hal_select_alarm_mode(systimer_alarm_id_t alarm_id,systimer_alarm_mode_t mode)106 void systimer_hal_select_alarm_mode(systimer_alarm_id_t alarm_id, systimer_alarm_mode_t mode)
107 {
108 switch (mode) {
109 case SYSTIMER_ALARM_MODE_ONESHOT:
110 systimer_ll_enable_alarm_oneshot(alarm_id);
111 break;
112 case SYSTIMER_ALARM_MODE_PERIOD:
113 systimer_ll_enable_alarm_period(alarm_id);
114 break;
115 default:
116 break;
117 }
118 }
119
systimer_hal_connect_alarm_counter(systimer_alarm_id_t alarm_id,systimer_counter_id_t counter_id)120 void systimer_hal_connect_alarm_counter(systimer_alarm_id_t alarm_id, systimer_counter_id_t counter_id)
121 {
122 systimer_ll_connect_alarm_counter(alarm_id, counter_id);
123 }
124
