1 /*
2 * SPDX-License-Identifier: Apache-2.0
3 *
4 * Copyright (c) 2023 Nuvoton Technology Corporation.
5 */
6
7 #define DT_DRV_COMPAT nuvoton_numaker_rst
8
9 #include <zephyr/arch/cpu.h>
10 #include <zephyr/device.h>
11 #include <zephyr/devicetree.h>
12 #include <zephyr/drivers/reset.h>
13
14 /* Reset controller module IPRST offset */
15 #define NUMAKER_RESET_IPRST0_OFFSET (8UL)
16 #define NUMAKER_RESET_IP_OFFSET(id) (NUMAKER_RESET_IPRST0_OFFSET + (((id) >> 24UL) & 0xffUL))
17 /* Reset controller module configuration bit */
18 #define NUMAKER_RESET_IP_BIT(id) (id & 0x00ffffffUL)
19
20 struct reset_numaker_config {
21 uint32_t base;
22 };
23
reset_numaker_status(const struct device * dev,uint32_t id,uint8_t * status)24 static int reset_numaker_status(const struct device *dev, uint32_t id, uint8_t *status)
25 {
26 const struct reset_numaker_config *config = dev->config;
27
28 *status = !!sys_test_bit(config->base + NUMAKER_RESET_IP_OFFSET(id),
29 NUMAKER_RESET_IP_BIT(id));
30
31 return 0;
32 }
33
reset_numaker_line_assert(const struct device * dev,uint32_t id)34 static int reset_numaker_line_assert(const struct device *dev, uint32_t id)
35 {
36 const struct reset_numaker_config *config = dev->config;
37
38 /* Generate reset signal to the corresponding module */
39 sys_set_bit(config->base + NUMAKER_RESET_IP_OFFSET(id), NUMAKER_RESET_IP_BIT(id));
40
41 return 0;
42 }
43
reset_numaker_line_deassert(const struct device * dev,uint32_t id)44 static int reset_numaker_line_deassert(const struct device *dev, uint32_t id)
45 {
46 const struct reset_numaker_config *config = dev->config;
47
48 /* Release corresponding module from reset state */
49 sys_clear_bit(config->base + NUMAKER_RESET_IP_OFFSET(id), NUMAKER_RESET_IP_BIT(id));
50
51 return 0;
52 }
53
reset_numaker_line_toggle(const struct device * dev,uint32_t id)54 static int reset_numaker_line_toggle(const struct device *dev, uint32_t id)
55 {
56 (void)reset_numaker_line_assert(dev, id);
57 (void)reset_numaker_line_deassert(dev, id);
58
59 return 0;
60 }
61
62 static const struct reset_driver_api reset_numaker_driver_api = {
63 .status = reset_numaker_status,
64 .line_assert = reset_numaker_line_assert,
65 .line_deassert = reset_numaker_line_deassert,
66 .line_toggle = reset_numaker_line_toggle,
67 };
68
69 static const struct reset_numaker_config config = {
70 .base = (uint32_t)DT_INST_REG_ADDR(0),
71 };
72
73 DEVICE_DT_INST_DEFINE(0, NULL, NULL, NULL, &config, PRE_KERNEL_1,
74 CONFIG_RESET_INIT_PRIORITY, &reset_numaker_driver_api);
75
