1 /*
2 * Copyright (c) 2018, Nordic Semiconductor ASA
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/drivers/i2c.h>
8 #include <zephyr/drivers/pinctrl.h>
9 #include <zephyr/dt-bindings/i2c/i2c.h>
10 #include <zephyr/logging/log.h>
11 #include <zephyr/pm/device_runtime.h>
12
13 #include "i2c_nrfx_twim_common.h"
14
15 LOG_MODULE_DECLARE(i2c_nrfx_twim);
16
i2c_nrfx_twim_recover_bus(const struct device * dev)17 int i2c_nrfx_twim_recover_bus(const struct device *dev)
18 {
19 const struct i2c_nrfx_twim_common_config *config = dev->config;
20 enum pm_device_state state;
21 uint32_t scl_pin;
22 uint32_t sda_pin;
23 nrfx_err_t err;
24
25 scl_pin = nrf_twim_scl_pin_get(config->twim.p_twim);
26 sda_pin = nrf_twim_sda_pin_get(config->twim.p_twim);
27
28 /* disable peripheral if active (required to release SCL/SDA lines) */
29 (void)pm_device_state_get(dev, &state);
30 if (state == PM_DEVICE_STATE_ACTIVE) {
31 nrfx_twim_disable(&config->twim);
32 }
33
34 err = nrfx_twim_bus_recover(scl_pin, sda_pin);
35
36 /* restore peripheral if it was active before */
37 if (state == PM_DEVICE_STATE_ACTIVE) {
38 (void)pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
39 nrfx_twim_enable(&config->twim);
40 }
41
42 return (err == NRFX_SUCCESS ? 0 : -EBUSY);
43 }
44
i2c_nrfx_twim_configure(const struct device * dev,uint32_t i2c_config)45 int i2c_nrfx_twim_configure(const struct device *dev, uint32_t i2c_config)
46 {
47 const struct i2c_nrfx_twim_common_config *config = dev->config;
48
49 if (I2C_ADDR_10_BITS & i2c_config) {
50 return -EINVAL;
51 }
52
53 switch (I2C_SPEED_GET(i2c_config)) {
54 case I2C_SPEED_STANDARD:
55 nrf_twim_frequency_set(config->twim.p_twim, NRF_TWIM_FREQ_100K);
56 break;
57 case I2C_SPEED_FAST:
58 nrf_twim_frequency_set(config->twim.p_twim, NRF_TWIM_FREQ_400K);
59 break;
60 #if NRF_TWIM_HAS_1000_KHZ_FREQ
61 case I2C_SPEED_FAST_PLUS:
62 nrf_twim_frequency_set(config->twim.p_twim, NRF_TWIM_FREQ_1000K);
63 break;
64 #endif
65 default:
66 LOG_ERR("unsupported speed");
67 return -EINVAL;
68 }
69
70 return 0;
71 }
72
i2c_nrfx_twim_msg_transfer(const struct device * dev,uint8_t flags,uint8_t * buf,size_t buf_len,uint16_t i2c_addr)73 int i2c_nrfx_twim_msg_transfer(const struct device *dev, uint8_t flags, uint8_t *buf,
74 size_t buf_len, uint16_t i2c_addr)
75 {
76 const struct i2c_nrfx_twim_common_config *config = dev->config;
77 nrfx_twim_xfer_desc_t cur_xfer = {
78 .address = i2c_addr,
79 .type = (flags & I2C_MSG_READ) ? NRFX_TWIM_XFER_RX : NRFX_TWIM_XFER_TX,
80 .p_primary_buf = buf,
81 .primary_length = buf_len,
82 };
83 nrfx_err_t res;
84 int ret = 0;
85
86 if (buf_len > config->max_transfer_size) {
87 LOG_ERR("Trying to transfer more than the maximum size "
88 "for this device: %d > %d",
89 buf_len, config->max_transfer_size);
90 return -ENOSPC;
91 }
92
93 res = nrfx_twim_xfer(&config->twim, &cur_xfer,
94 (flags & I2C_MSG_STOP) ? 0 : NRFX_TWIM_FLAG_TX_NO_STOP);
95 if (res != NRFX_SUCCESS) {
96 if (res == NRFX_ERROR_BUSY) {
97 ret = -EBUSY;
98 } else {
99 ret = -EIO;
100 }
101 }
102 return ret;
103 }
104
twim_nrfx_pm_action(const struct device * dev,enum pm_device_action action)105 int twim_nrfx_pm_action(const struct device *dev, enum pm_device_action action)
106 {
107 const struct i2c_nrfx_twim_common_config *config = dev->config;
108
109 switch (action) {
110 case PM_DEVICE_ACTION_RESUME:
111 (void)pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
112 nrfx_twim_enable(&config->twim);
113 break;
114 case PM_DEVICE_ACTION_SUSPEND:
115 nrfx_twim_disable(&config->twim);
116 (void)pinctrl_apply_state(config->pcfg, PINCTRL_STATE_SLEEP);
117 break;
118 default:
119 return -ENOTSUP;
120 }
121
122 return 0;
123 }
124
i2c_nrfx_twim_common_init(const struct device * dev)125 int i2c_nrfx_twim_common_init(const struct device *dev)
126 {
127 const struct i2c_nrfx_twim_common_config *config = dev->config;
128
129 config->irq_connect();
130
131 (void)pinctrl_apply_state(config->pcfg, PINCTRL_STATE_SLEEP);
132
133 if (nrfx_twim_init(&config->twim, &config->twim_config, config->event_handler,
134 (void *)dev) != NRFX_SUCCESS) {
135 LOG_ERR("Failed to initialize device: %s", dev->name);
136 return -EIO;
137 }
138
139 return pm_device_driver_init(dev, twim_nrfx_pm_action);
140 }
141
