1 /*
2 * Copyright (c) 2022 Google Inc
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT st_stm32_rcc_rctl
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 #define STM32_RESET_CLR_OFFSET(id) (((id) >> 17U) & 0xFFFU)
15 #define STM32_RESET_SET_OFFSET(id) (((id) >> 5U) & 0xFFFU)
16 #define STM32_RESET_REG_BIT(id) ((id)&0x1FU)
17
18 struct reset_stm32_config {
19 uintptr_t base;
20 };
21
reset_stm32_status(const struct device * dev,uint32_t id,uint8_t * status)22 static int reset_stm32_status(const struct device *dev, uint32_t id,
23 uint8_t *status)
24 {
25 const struct reset_stm32_config *config = dev->config;
26
27 *status = !!sys_test_bit(config->base + STM32_RESET_SET_OFFSET(id),
28 STM32_RESET_REG_BIT(id));
29
30 return 0;
31 }
32
reset_stm32_line_assert(const struct device * dev,uint32_t id)33 static int reset_stm32_line_assert(const struct device *dev, uint32_t id)
34 {
35 const struct reset_stm32_config *config = dev->config;
36
37 sys_set_bit(config->base + STM32_RESET_SET_OFFSET(id),
38 STM32_RESET_REG_BIT(id));
39
40 return 0;
41 }
42
reset_stm32_line_deassert(const struct device * dev,uint32_t id)43 static int reset_stm32_line_deassert(const struct device *dev, uint32_t id)
44 {
45 const struct reset_stm32_config *config = dev->config;
46
47 #if DT_INST_PROP(0, set_bit_to_deassert)
48 sys_set_bit(config->base + STM32_RESET_CLR_OFFSET(id),
49 STM32_RESET_REG_BIT(id));
50 #else
51 sys_clear_bit(config->base + STM32_RESET_SET_OFFSET(id),
52 STM32_RESET_REG_BIT(id));
53 #endif
54
55 return 0;
56 }
57
reset_stm32_line_toggle(const struct device * dev,uint32_t id)58 static int reset_stm32_line_toggle(const struct device *dev, uint32_t id)
59 {
60 reset_stm32_line_assert(dev, id);
61 reset_stm32_line_deassert(dev, id);
62
63 return 0;
64 }
65
66 static const struct reset_driver_api reset_stm32_driver_api = {
67 .status = reset_stm32_status,
68 .line_assert = reset_stm32_line_assert,
69 .line_deassert = reset_stm32_line_deassert,
70 .line_toggle = reset_stm32_line_toggle,
71 };
72
73 static const struct reset_stm32_config reset_stm32_config = {
74 .base = DT_REG_ADDR(DT_INST_PARENT(0)),
75 };
76
77 DEVICE_DT_INST_DEFINE(0, NULL, NULL, NULL, &reset_stm32_config, PRE_KERNEL_1,
78 CONFIG_RESET_INIT_PRIORITY, &reset_stm32_driver_api);
79
