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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 | /* * Copyright (c) 2017 Jean-Paul Etienne <fractalclone@gmail.com> * * SPDX-License-Identifier: Apache-2.0 */ /** * @brief UART driver for the SiFive Freedom E310 Processor */ #include <kernel.h> #include <arch/cpu.h> #include <uart.h> #include <board.h> #define RXDATA_EMPTY (1 << 31) /* Receive FIFO Empty */ #define RXDATA_MASK 0xFF /* Receive Data Mask */ #define TXDATA_FULL (1 << 31) /* Transmit FIFO Full */ #define TXCTRL_TXEN (1 << 0) /* Activate Tx Channel */ #define RXCTRL_RXEN (1 << 0) /* Activate Rx Channel */ #define IE_TXWM (1 << 0) /* TX Interrupt Enable/Pending */ #define IE_RXWM (1 << 1) /* RX Interrupt Enable/Pending */ /* * RX/TX Threshold count to generate TX/RX Interrupts. * Used by txctrl and rxctrl registers */ #define CTRL_CNT(x) (((x) & 0x07) << 16) struct uart_fe310_regs_t { u32_t tx; u32_t rx; u32_t txctrl; u32_t rxctrl; u32_t ie; u32_t ip; u32_t div; }; #ifdef CONFIG_UART_INTERRUPT_DRIVEN typedef void (*irq_cfg_func_t)(void); #endif struct uart_fe310_device_config { u32_t port; u32_t sys_clk_freq; u32_t baud_rate; u32_t rxcnt_irq; u32_t txcnt_irq; #ifdef CONFIG_UART_INTERRUPT_DRIVEN irq_cfg_func_t cfg_func; #endif }; struct uart_fe310_data { #ifdef CONFIG_UART_INTERRUPT_DRIVEN uart_irq_callback_t callback; #endif }; #define DEV_CFG(dev) \ ((const struct uart_fe310_device_config * const) \ (dev)->config->config_info) #define DEV_UART(dev) \ ((struct uart_fe310_regs_t *)(DEV_CFG(dev))->port) #define DEV_DATA(dev) \ ((struct uart_fe310_data * const)(dev)->driver_data) /** * @brief Output a character in polled mode. * * Writes data to tx register if transmitter is not full. * * @param dev UART device struct * @param c Character to send * * @return Sent character */ static unsigned char uart_fe310_poll_out(struct device *dev, unsigned char c) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); /* Wait while TX FIFO is full */ while (uart->tx & TXDATA_FULL) ; uart->tx = (int)c; return c; } /** * @brief Poll the device for input. * * @param dev UART device struct * @param c Pointer to character * * @return 0 if a character arrived, -1 if the input buffer if empty. */ static int uart_fe310_poll_in(struct device *dev, unsigned char *c) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); u32_t val = uart->rx; if (val & RXDATA_EMPTY) return -1; *c = (unsigned char)(val & RXDATA_MASK); return 0; } #ifdef CONFIG_UART_INTERRUPT_DRIVEN /** * @brief Fill FIFO with data * * @param dev UART device struct * @param tx_data Data to transmit * @param size Number of bytes to send * * @return Number of bytes sent */ static int uart_fe310_fifo_fill(struct device *dev, const u8_t *tx_data, int size) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); int i; for (i = 0; i < size && !(uart->tx & TXDATA_FULL); i++) uart->tx = (int)tx_data[i]; return i; } /** * @brief Read data from FIFO * * @param dev UART device struct * @param rxData Data container * @param size Container size * * @return Number of bytes read */ static int uart_fe310_fifo_read(struct device *dev, u8_t *rx_data, const int size) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); int i; u32_t val; for (i = 0; i < size; i++) { val = uart->rx; if (val & RXDATA_EMPTY) break; rx_data[i] = (u8_t)(val & RXDATA_MASK); } return i; } /** * @brief Enable TX interrupt in ie register * * @param dev UART device struct * * @return N/A */ static void uart_fe310_irq_tx_enable(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); uart->ie |= IE_TXWM; } /** * @brief Disable TX interrupt in ie register * * @param dev UART device struct * * @return N/A */ static void uart_fe310_irq_tx_disable(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); uart->ie &= ~IE_TXWM; } /** * @brief Check if Tx IRQ has been raised * * @param dev UART device struct * * @return 1 if an IRQ is ready, 0 otherwise */ static int uart_fe310_irq_tx_ready(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); return !!(uart->ip & IE_TXWM); } /** * @brief Check if nothing remains to be transmitted * * @param dev UART device struct * * @return 1 if nothing remains to be transmitted, 0 otherwise */ static int uart_fe310_irq_tx_complete(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); /* * No TX EMTPY flag for this controller, * just check if TX FIFO is not full */ return !(uart->tx & TXDATA_FULL); } /** * @brief Enable RX interrupt in ie register * * @param dev UART device struct * * @return N/A */ static void uart_fe310_irq_rx_enable(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); uart->ie |= IE_RXWM; } /** * @brief Disable RX interrupt in ie register * * @param dev UART device struct * * @return N/A */ static void uart_fe310_irq_rx_disable(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); uart->ie &= ~IE_RXWM; } /** * @brief Check if Rx IRQ has been raised * * @param dev UART device struct * * @return 1 if an IRQ is ready, 0 otherwise */ static int uart_fe310_irq_rx_ready(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); return !!(uart->ip & IE_RXWM); } /* No error interrupt for this controller */ static void uart_fe310_irq_err_enable(struct device *dev) { ARG_UNUSED(dev); } static void uart_fe310_irq_err_disable(struct device *dev) { ARG_UNUSED(dev); } /** * @brief Check if any IRQ is pending * * @param dev UART device struct * * @return 1 if an IRQ is pending, 0 otherwise */ static int uart_fe310_irq_is_pending(struct device *dev) { volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); return !!(uart->ip & (IE_RXWM | IE_TXWM)); } static int uart_fe310_irq_update(struct device *dev) { return 1; } /** * @brief Set the callback function pointer for IRQ. * * @param dev UART device struct * @param cb Callback function pointer. * * @return N/A */ static void uart_fe310_irq_callback_set(struct device *dev, uart_irq_callback_t cb) { struct uart_fe310_data *data = DEV_DATA(dev); data->callback = cb; } static void uart_fe310_irq_handler(void *arg) { struct device *dev = (struct device *)arg; struct uart_fe310_data *data = DEV_DATA(dev); if (data->callback) data->callback(dev); } #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ static int uart_fe310_init(struct device *dev) { const struct uart_fe310_device_config * const cfg = DEV_CFG(dev); volatile struct uart_fe310_regs_t *uart = DEV_UART(dev); /* Enable TX and RX channels */ uart->txctrl = TXCTRL_TXEN | CTRL_CNT(cfg->rxcnt_irq); uart->rxctrl = RXCTRL_RXEN | CTRL_CNT(cfg->txcnt_irq); /* Set baud rate */ uart->div = cfg->sys_clk_freq / cfg->baud_rate - 1; #ifdef CONFIG_UART_INTERRUPT_DRIVEN /* Ensure that uart IRQ is disabled initially */ uart->ie = 0; /* Setup IRQ handler */ cfg->cfg_func(); #endif return 0; } static const struct uart_driver_api uart_fe310_driver_api = { .poll_in = uart_fe310_poll_in, .poll_out = uart_fe310_poll_out, .err_check = NULL, #ifdef CONFIG_UART_INTERRUPT_DRIVEN .fifo_fill = uart_fe310_fifo_fill, .fifo_read = uart_fe310_fifo_read, .irq_tx_enable = uart_fe310_irq_tx_enable, .irq_tx_disable = uart_fe310_irq_tx_disable, .irq_tx_ready = uart_fe310_irq_tx_ready, .irq_tx_complete = uart_fe310_irq_tx_complete, .irq_rx_enable = uart_fe310_irq_rx_enable, .irq_rx_disable = uart_fe310_irq_rx_disable, .irq_rx_ready = uart_fe310_irq_rx_ready, .irq_err_enable = uart_fe310_irq_err_enable, .irq_err_disable = uart_fe310_irq_err_disable, .irq_is_pending = uart_fe310_irq_is_pending, .irq_update = uart_fe310_irq_update, .irq_callback_set = uart_fe310_irq_callback_set, #endif }; #ifdef CONFIG_UART_FE310_PORT_0 static struct uart_fe310_data uart_fe310_data_0; #ifdef CONFIG_UART_INTERRUPT_DRIVEN static void uart_fe310_irq_cfg_func_0(void); #endif static const struct uart_fe310_device_config uart_fe310_dev_cfg_0 = { .port = FE310_UART_0_BASE_ADDR, .sys_clk_freq = uart_fe310_port_0_clk_freq, .baud_rate = CONFIG_UART_FE310_PORT_0_BAUD_RATE, .rxcnt_irq = CONFIG_UART_FE310_PORT_0_RXCNT_IRQ, .txcnt_irq = CONFIG_UART_FE310_PORT_0_TXCNT_IRQ, #ifdef CONFIG_UART_INTERRUPT_DRIVEN .cfg_func = uart_fe310_irq_cfg_func_0, #endif }; DEVICE_AND_API_INIT(uart_fe310_0, CONFIG_UART_FE310_PORT_0_NAME, uart_fe310_init, &uart_fe310_data_0, &uart_fe310_dev_cfg_0, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, (void *)&uart_fe310_driver_api); #ifdef CONFIG_UART_INTERRUPT_DRIVEN static void uart_fe310_irq_cfg_func_0(void) { IRQ_CONNECT(FE310_UART_0_IRQ, CONFIG_UART_FE310_PORT_0_IRQ_PRIORITY, uart_fe310_irq_handler, DEVICE_GET(uart_fe310_0), 0); irq_enable(FE310_UART_0_IRQ); } #endif #endif /* CONFIG_UART_FE310_PORT_0 */ #ifdef CONFIG_UART_FE310_PORT_1 static struct uart_fe310_data uart_fe310_data_1; #ifdef CONFIG_UART_INTERRUPT_DRIVEN static void uart_fe310_irq_cfg_func_1(void); #endif static const struct uart_fe310_device_config uart_fe310_dev_cfg_1 = { .port = FE310_UART_1_BASE_ADDR, .sys_clk_freq = uart_fe310_port_1_clk_freq, .baud_rate = CONFIG_UART_FE310_PORT_1_BAUD_RATE, .rxcnt_irq = CONFIG_UART_FE310_PORT_1_RXCNT_IRQ, .txcnt_irq = CONFIG_UART_FE310_PORT_1_TXCNT_IRQ, #ifdef CONFIG_UART_INTERRUPT_DRIVEN .cfg_func = uart_fe310_irq_cfg_func_1, #endif }; DEVICE_AND_API_INIT(uart_fe310_1, CONFIG_UART_FE310_PORT_1_NAME, uart_fe310_init, &uart_fe310_data_1, &uart_fe310_dev_cfg_1, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, (void *)&uart_fe310_driver_api); #ifdef CONFIG_UART_INTERRUPT_DRIVEN static void uart_fe310_irq_cfg_func_1(void) { IRQ_CONNECT(FE310_UART_1_IRQ, CONFIG_UART_FE310_PORT_1_IRQ_PRIORITY, uart_fe310_irq_handler, DEVICE_GET(uart_fe310_1), 0); irq_enable(FE310_UART_1_IRQ); } #endif #endif /* CONFIG_UART_FE310_PORT_1 */ |