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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 | /* * Copyright (c) 2018, Nordic Semiconductor ASA * * SPDX-License-Identifier: Apache-2.0 */ #include <drivers/i2c.h> #include <dt-bindings/i2c/i2c.h> #include <nrfx_twi.h> #define LOG_LEVEL CONFIG_I2C_LOG_LEVEL #include <logging/log.h> LOG_MODULE_REGISTER(i2c_nrfx_twi); struct i2c_nrfx_twi_data { struct k_sem transfer_sync; struct k_sem completion_sync; volatile nrfx_err_t res; u32_t dev_config; #ifdef CONFIG_DEVICE_POWER_MANAGEMENT u32_t pm_state; #endif }; struct i2c_nrfx_twi_config { nrfx_twi_t twi; nrfx_twi_config_t config; }; static inline struct i2c_nrfx_twi_data *get_dev_data(struct device *dev) { return dev->driver_data; } static inline const struct i2c_nrfx_twi_config *get_dev_config(struct device *dev) { return dev->config->config_info; } static int i2c_nrfx_twi_transfer(struct device *dev, struct i2c_msg *msgs, u8_t num_msgs, u16_t addr) { int ret = 0; k_sem_take(&(get_dev_data(dev)->transfer_sync), K_FOREVER); nrfx_twi_enable(&get_dev_config(dev)->twi); for (size_t i = 0; i < num_msgs; i++) { if (I2C_MSG_ADDR_10_BITS & msgs[i].flags) { ret = -ENOTSUP; break; } nrfx_twi_xfer_desc_t cur_xfer = { .p_primary_buf = msgs[i].buf, .primary_length = msgs[i].len, .address = addr, .type = (msgs[i].flags & I2C_MSG_READ) ? NRFX_TWI_XFER_RX : NRFX_TWI_XFER_TX }; u32_t xfer_flags = 0; nrfx_err_t res; /* In case the STOP condition is not supposed to appear after * the current message, check what is requested further: */ if (!(msgs[i].flags & I2C_MSG_STOP)) { /* - if the transfer consists of more messages * and the I2C repeated START is not requested * to appear before the next message, suspend * the transfer after the current message, * so that it can be resumed with the next one, * resulting in the two messages merged into * a continuous transfer on the bus */ if ((i < (num_msgs - 1)) && !(msgs[i + 1].flags & I2C_MSG_RESTART)) { xfer_flags |= NRFX_TWI_FLAG_SUSPEND; /* - otherwise, just finish the transfer without * generating the STOP condition, unless the current * message is an RX request, for which such feature * is not supported */ } else if (msgs[i].flags & I2C_MSG_READ) { ret = -ENOTSUP; break; } else { xfer_flags |= NRFX_TWI_FLAG_TX_NO_STOP; } } res = nrfx_twi_xfer(&get_dev_config(dev)->twi, &cur_xfer, xfer_flags); if (res != NRFX_SUCCESS) { if (res == NRFX_ERROR_BUSY) { ret = -EBUSY; break; } else { ret = -EIO; break; } } k_sem_take(&(get_dev_data(dev)->completion_sync), K_FOREVER); res = get_dev_data(dev)->res; if (res != NRFX_SUCCESS) { LOG_ERR("Error %d occurred for message %d", res, i); ret = -EIO; break; } } nrfx_twi_disable(&get_dev_config(dev)->twi); k_sem_give(&(get_dev_data(dev)->transfer_sync)); return ret; } static void event_handler(nrfx_twi_evt_t const *p_event, void *p_context) { struct device *dev = p_context; struct i2c_nrfx_twi_data *dev_data = get_dev_data(dev); switch (p_event->type) { case NRFX_TWI_EVT_DONE: dev_data->res = NRFX_SUCCESS; break; case NRFX_TWI_EVT_ADDRESS_NACK: dev_data->res = NRFX_ERROR_DRV_TWI_ERR_ANACK; break; case NRFX_TWI_EVT_DATA_NACK: dev_data->res = NRFX_ERROR_DRV_TWI_ERR_DNACK; break; default: dev_data->res = NRFX_ERROR_INTERNAL; break; } k_sem_give(&dev_data->completion_sync); } static int i2c_nrfx_twi_configure(struct device *dev, u32_t dev_config) { nrfx_twi_t const *inst = &(get_dev_config(dev)->twi); if (I2C_ADDR_10_BITS & dev_config) { return -EINVAL; } switch (I2C_SPEED_GET(dev_config)) { case I2C_SPEED_STANDARD: nrf_twi_frequency_set(inst->p_twi, NRF_TWI_FREQ_100K); break; case I2C_SPEED_FAST: nrf_twi_frequency_set(inst->p_twi, NRF_TWI_FREQ_400K); break; default: LOG_ERR("unsupported speed"); return -EINVAL; } get_dev_data(dev)->dev_config = dev_config; return 0; } static const struct i2c_driver_api i2c_nrfx_twi_driver_api = { .configure = i2c_nrfx_twi_configure, .transfer = i2c_nrfx_twi_transfer, }; static int init_twi(struct device *dev) { nrfx_err_t result = nrfx_twi_init(&get_dev_config(dev)->twi, &get_dev_config(dev)->config, event_handler, dev); if (result != NRFX_SUCCESS) { LOG_ERR("Failed to initialize device: %s", dev->config->name); return -EBUSY; } #ifdef CONFIG_DEVICE_POWER_MANAGEMENT get_dev_data(dev)->pm_state = DEVICE_PM_ACTIVE_STATE; #endif return 0; } #ifdef CONFIG_DEVICE_POWER_MANAGEMENT static int twi_nrfx_pm_control(struct device *dev, u32_t ctrl_command, void *context, device_pm_cb cb, void *arg) { int ret = 0; if (ctrl_command == DEVICE_PM_SET_POWER_STATE) { u32_t new_state = *((const u32_t *)context); if (new_state != get_dev_data(dev)->pm_state) { switch (new_state) { case DEVICE_PM_ACTIVE_STATE: init_twi(dev); if (get_dev_data(dev)->dev_config) { i2c_nrfx_twi_configure( dev, get_dev_data(dev)->dev_config); } break; case DEVICE_PM_LOW_POWER_STATE: case DEVICE_PM_SUSPEND_STATE: case DEVICE_PM_OFF_STATE: nrfx_twi_uninit(&get_dev_config(dev)->twi); break; default: ret = -ENOTSUP; } if (!ret) { get_dev_data(dev)->pm_state = new_state; } } } else { assert(ctrl_command == DEVICE_PM_GET_POWER_STATE); *((u32_t *)context) = get_dev_data(dev)->pm_state; } if (cb) { cb(dev, ret, context, arg); } return ret; } #endif /* CONFIG_DEVICE_POWER_MANAGEMENT */ #define I2C_NRFX_TWI_INVALID_FREQUENCY ((nrf_twi_frequency_t)-1) #define I2C_NRFX_TWI_FREQUENCY(bitrate) \ (bitrate == I2C_BITRATE_STANDARD ? NRF_TWI_FREQ_100K \ : bitrate == 250000 ? NRF_TWI_FREQ_250K \ : bitrate == I2C_BITRATE_FAST ? NRF_TWI_FREQ_400K \ : I2C_NRFX_TWI_INVALID_FREQUENCY) #define I2C_NRFX_TWI_DEVICE(idx) \ BUILD_ASSERT_MSG( \ I2C_NRFX_TWI_FREQUENCY( \ DT_NORDIC_NRF_TWI_I2C_##idx##_CLOCK_FREQUENCY) \ != I2C_NRFX_TWI_INVALID_FREQUENCY, \ "Wrong I2C " #idx " frequency setting in dts"); \ static int twi_##idx##_init(struct device *dev) \ { \ IRQ_CONNECT(DT_NORDIC_NRF_TWI_I2C_##idx##_IRQ_0, \ DT_NORDIC_NRF_TWI_I2C_##idx##_IRQ_0_PRIORITY, \ nrfx_isr, nrfx_twi_##idx##_irq_handler, 0); \ return init_twi(dev); \ } \ static struct i2c_nrfx_twi_data twi_##idx##_data = { \ .transfer_sync = Z_SEM_INITIALIZER( \ twi_##idx##_data.transfer_sync, 1, 1), \ .completion_sync = Z_SEM_INITIALIZER( \ twi_##idx##_data.completion_sync, 0, 1) \ }; \ static const struct i2c_nrfx_twi_config twi_##idx##z_config = { \ .twi = NRFX_TWI_INSTANCE(idx), \ .config = { \ .scl = DT_NORDIC_NRF_TWI_I2C_##idx##_SCL_PIN, \ .sda = DT_NORDIC_NRF_TWI_I2C_##idx##_SDA_PIN, \ .frequency = I2C_NRFX_TWI_FREQUENCY( \ DT_NORDIC_NRF_TWI_I2C_##idx##_CLOCK_FREQUENCY) \ } \ }; \ DEVICE_DEFINE(twi_##idx, \ DT_NORDIC_NRF_TWI_I2C_##idx##_LABEL, \ twi_##idx##_init, \ twi_nrfx_pm_control, \ &twi_##idx##_data, \ &twi_##idx##z_config, \ POST_KERNEL, \ CONFIG_I2C_INIT_PRIORITY, \ &i2c_nrfx_twi_driver_api) #ifdef CONFIG_I2C_0_NRF_TWI I2C_NRFX_TWI_DEVICE(0); #endif #ifdef CONFIG_I2C_1_NRF_TWI I2C_NRFX_TWI_DEVICE(1); #endif |