1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * NXP (Philips) SCC+++(SCN+++) serial driver 4 * 5 * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru> 6 * 7 * Based on sc26xx.c, by Thomas Bogendörfer (tsbogend@alpha.franken.de) 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/delay.h> 12 #include <linux/err.h> 13 #include <linux/module.h> 14 #include <linux/mod_devicetable.h> 15 #include <linux/device.h> 16 #include <linux/console.h> 17 #include <linux/serial_core.h> 18 #include <linux/serial.h> 19 #include <linux/io.h> 20 #include <linux/tty.h> 21 #include <linux/tty_flip.h> 22 #include <linux/spinlock.h> 23 #include <linux/platform_device.h> 24 #include <linux/platform_data/serial-sccnxp.h> 25 #include <linux/regulator/consumer.h> 26 27 #define SCCNXP_NAME "uart-sccnxp" 28 #define SCCNXP_MAJOR 204 29 #define SCCNXP_MINOR 205 30 31 #define SCCNXP_MR_REG (0x00) 32 # define MR0_BAUD_NORMAL (0 << 0) 33 # define MR0_BAUD_EXT1 (1 << 0) 34 # define MR0_BAUD_EXT2 (5 << 0) 35 # define MR0_FIFO (1 << 3) 36 # define MR0_TXLVL (1 << 4) 37 # define MR1_BITS_5 (0 << 0) 38 # define MR1_BITS_6 (1 << 0) 39 # define MR1_BITS_7 (2 << 0) 40 # define MR1_BITS_8 (3 << 0) 41 # define MR1_PAR_EVN (0 << 2) 42 # define MR1_PAR_ODD (1 << 2) 43 # define MR1_PAR_NO (4 << 2) 44 # define MR2_STOP1 (7 << 0) 45 # define MR2_STOP2 (0xf << 0) 46 #define SCCNXP_SR_REG (0x01) 47 # define SR_RXRDY (1 << 0) 48 # define SR_FULL (1 << 1) 49 # define SR_TXRDY (1 << 2) 50 # define SR_TXEMT (1 << 3) 51 # define SR_OVR (1 << 4) 52 # define SR_PE (1 << 5) 53 # define SR_FE (1 << 6) 54 # define SR_BRK (1 << 7) 55 #define SCCNXP_CSR_REG (SCCNXP_SR_REG) 56 # define CSR_TIMER_MODE (0x0d) 57 #define SCCNXP_CR_REG (0x02) 58 # define CR_RX_ENABLE (1 << 0) 59 # define CR_RX_DISABLE (1 << 1) 60 # define CR_TX_ENABLE (1 << 2) 61 # define CR_TX_DISABLE (1 << 3) 62 # define CR_CMD_MRPTR1 (0x01 << 4) 63 # define CR_CMD_RX_RESET (0x02 << 4) 64 # define CR_CMD_TX_RESET (0x03 << 4) 65 # define CR_CMD_STATUS_RESET (0x04 << 4) 66 # define CR_CMD_BREAK_RESET (0x05 << 4) 67 # define CR_CMD_START_BREAK (0x06 << 4) 68 # define CR_CMD_STOP_BREAK (0x07 << 4) 69 # define CR_CMD_MRPTR0 (0x0b << 4) 70 #define SCCNXP_RHR_REG (0x03) 71 #define SCCNXP_THR_REG SCCNXP_RHR_REG 72 #define SCCNXP_IPCR_REG (0x04) 73 #define SCCNXP_ACR_REG SCCNXP_IPCR_REG 74 # define ACR_BAUD0 (0 << 7) 75 # define ACR_BAUD1 (1 << 7) 76 # define ACR_TIMER_MODE (6 << 4) 77 #define SCCNXP_ISR_REG (0x05) 78 #define SCCNXP_IMR_REG SCCNXP_ISR_REG 79 # define IMR_TXRDY (1 << 0) 80 # define IMR_RXRDY (1 << 1) 81 # define ISR_TXRDY(x) (1 << ((x * 4) + 0)) 82 # define ISR_RXRDY(x) (1 << ((x * 4) + 1)) 83 #define SCCNXP_CTPU_REG (0x06) 84 #define SCCNXP_CTPL_REG (0x07) 85 #define SCCNXP_IPR_REG (0x0d) 86 #define SCCNXP_OPCR_REG SCCNXP_IPR_REG 87 #define SCCNXP_SOP_REG (0x0e) 88 #define SCCNXP_START_COUNTER_REG SCCNXP_SOP_REG 89 #define SCCNXP_ROP_REG (0x0f) 90 91 /* Route helpers */ 92 #define MCTRL_MASK(sig) (0xf << (sig)) 93 #define MCTRL_IBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_IP0) 94 #define MCTRL_OBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_OP0) 95 96 #define SCCNXP_HAVE_IO 0x00000001 97 #define SCCNXP_HAVE_MR0 0x00000002 98 99 struct sccnxp_chip { 100 const char *name; 101 unsigned int nr; 102 unsigned long freq_min; 103 unsigned long freq_std; 104 unsigned long freq_max; 105 unsigned int flags; 106 unsigned int fifosize; 107 /* Time between read/write cycles */ 108 unsigned int trwd; 109 }; 110 111 struct sccnxp_port { 112 struct uart_driver uart; 113 struct uart_port port[SCCNXP_MAX_UARTS]; 114 bool opened[SCCNXP_MAX_UARTS]; 115 116 int irq; 117 u8 imr; 118 119 struct sccnxp_chip *chip; 120 121 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE 122 struct console console; 123 #endif 124 125 spinlock_t lock; 126 127 bool poll; 128 struct timer_list timer; 129 130 struct sccnxp_pdata pdata; 131 132 struct regulator *regulator; 133 }; 134 135 static const struct sccnxp_chip sc2681 = { 136 .name = "SC2681", 137 .nr = 2, 138 .freq_min = 1000000, 139 .freq_std = 3686400, 140 .freq_max = 4000000, 141 .flags = SCCNXP_HAVE_IO, 142 .fifosize = 3, 143 .trwd = 200, 144 }; 145 146 static const struct sccnxp_chip sc2691 = { 147 .name = "SC2691", 148 .nr = 1, 149 .freq_min = 1000000, 150 .freq_std = 3686400, 151 .freq_max = 4000000, 152 .flags = 0, 153 .fifosize = 3, 154 .trwd = 150, 155 }; 156 157 static const struct sccnxp_chip sc2692 = { 158 .name = "SC2692", 159 .nr = 2, 160 .freq_min = 1000000, 161 .freq_std = 3686400, 162 .freq_max = 4000000, 163 .flags = SCCNXP_HAVE_IO, 164 .fifosize = 3, 165 .trwd = 30, 166 }; 167 168 static const struct sccnxp_chip sc2891 = { 169 .name = "SC2891", 170 .nr = 1, 171 .freq_min = 100000, 172 .freq_std = 3686400, 173 .freq_max = 8000000, 174 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0, 175 .fifosize = 16, 176 .trwd = 27, 177 }; 178 179 static const struct sccnxp_chip sc2892 = { 180 .name = "SC2892", 181 .nr = 2, 182 .freq_min = 100000, 183 .freq_std = 3686400, 184 .freq_max = 8000000, 185 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0, 186 .fifosize = 16, 187 .trwd = 17, 188 }; 189 190 static const struct sccnxp_chip sc28202 = { 191 .name = "SC28202", 192 .nr = 2, 193 .freq_min = 1000000, 194 .freq_std = 14745600, 195 .freq_max = 50000000, 196 .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0, 197 .fifosize = 256, 198 .trwd = 10, 199 }; 200 201 static const struct sccnxp_chip sc68681 = { 202 .name = "SC68681", 203 .nr = 2, 204 .freq_min = 1000000, 205 .freq_std = 3686400, 206 .freq_max = 4000000, 207 .flags = SCCNXP_HAVE_IO, 208 .fifosize = 3, 209 .trwd = 200, 210 }; 211 212 static const struct sccnxp_chip sc68692 = { 213 .name = "SC68692", 214 .nr = 2, 215 .freq_min = 1000000, 216 .freq_std = 3686400, 217 .freq_max = 4000000, 218 .flags = SCCNXP_HAVE_IO, 219 .fifosize = 3, 220 .trwd = 200, 221 }; 222 223 static u8 sccnxp_read(struct uart_port *port, u8 reg) 224 { 225 struct sccnxp_port *s = dev_get_drvdata(port->dev); 226 u8 ret; 227 228 ret = readb(port->membase + (reg << port->regshift)); 229 230 ndelay(s->chip->trwd); 231 232 return ret; 233 } 234 235 static void sccnxp_write(struct uart_port *port, u8 reg, u8 v) 236 { 237 struct sccnxp_port *s = dev_get_drvdata(port->dev); 238 239 writeb(v, port->membase + (reg << port->regshift)); 240 241 ndelay(s->chip->trwd); 242 } 243 244 static u8 sccnxp_port_read(struct uart_port *port, u8 reg) 245 { 246 return sccnxp_read(port, (port->line << 3) + reg); 247 } 248 249 static void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v) 250 { 251 sccnxp_write(port, (port->line << 3) + reg, v); 252 } 253 254 static int sccnxp_update_best_err(int a, int b, int *besterr) 255 { 256 int err = abs(a - b); 257 258 if (*besterr > err) { 259 *besterr = err; 260 return 0; 261 } 262 263 return 1; 264 } 265 266 static const struct { 267 u8 csr; 268 u8 acr; 269 u8 mr0; 270 int baud; 271 } baud_std[] = { 272 { 0, ACR_BAUD0, MR0_BAUD_NORMAL, 50, }, 273 { 0, ACR_BAUD1, MR0_BAUD_NORMAL, 75, }, 274 { 1, ACR_BAUD0, MR0_BAUD_NORMAL, 110, }, 275 { 2, ACR_BAUD0, MR0_BAUD_NORMAL, 134, }, 276 { 3, ACR_BAUD1, MR0_BAUD_NORMAL, 150, }, 277 { 3, ACR_BAUD0, MR0_BAUD_NORMAL, 200, }, 278 { 4, ACR_BAUD0, MR0_BAUD_NORMAL, 300, }, 279 { 0, ACR_BAUD1, MR0_BAUD_EXT1, 450, }, 280 { 1, ACR_BAUD0, MR0_BAUD_EXT2, 880, }, 281 { 3, ACR_BAUD1, MR0_BAUD_EXT1, 900, }, 282 { 5, ACR_BAUD0, MR0_BAUD_NORMAL, 600, }, 283 { 7, ACR_BAUD0, MR0_BAUD_NORMAL, 1050, }, 284 { 2, ACR_BAUD0, MR0_BAUD_EXT2, 1076, }, 285 { 6, ACR_BAUD0, MR0_BAUD_NORMAL, 1200, }, 286 { 10, ACR_BAUD1, MR0_BAUD_NORMAL, 1800, }, 287 { 7, ACR_BAUD1, MR0_BAUD_NORMAL, 2000, }, 288 { 8, ACR_BAUD0, MR0_BAUD_NORMAL, 2400, }, 289 { 5, ACR_BAUD1, MR0_BAUD_EXT1, 3600, }, 290 { 9, ACR_BAUD0, MR0_BAUD_NORMAL, 4800, }, 291 { 10, ACR_BAUD0, MR0_BAUD_NORMAL, 7200, }, 292 { 11, ACR_BAUD0, MR0_BAUD_NORMAL, 9600, }, 293 { 8, ACR_BAUD0, MR0_BAUD_EXT1, 14400, }, 294 { 12, ACR_BAUD1, MR0_BAUD_NORMAL, 19200, }, 295 { 9, ACR_BAUD0, MR0_BAUD_EXT1, 28800, }, 296 { 12, ACR_BAUD0, MR0_BAUD_NORMAL, 38400, }, 297 { 11, ACR_BAUD0, MR0_BAUD_EXT1, 57600, }, 298 { 12, ACR_BAUD1, MR0_BAUD_EXT1, 115200, }, 299 { 12, ACR_BAUD0, MR0_BAUD_EXT1, 230400, }, 300 { 0, 0, 0, 0 } 301 }; 302 303 static int sccnxp_set_baud(struct uart_port *port, int baud) 304 { 305 struct sccnxp_port *s = dev_get_drvdata(port->dev); 306 int div_std, tmp_baud, bestbaud = INT_MAX, besterr = INT_MAX; 307 struct sccnxp_chip *chip = s->chip; 308 u8 i, acr = 0, csr = 0, mr0 = 0; 309 310 /* Find divisor to load to the timer preset registers */ 311 div_std = DIV_ROUND_CLOSEST(port->uartclk, 2 * 16 * baud); 312 if ((div_std >= 2) && (div_std <= 0xffff)) { 313 bestbaud = DIV_ROUND_CLOSEST(port->uartclk, 2 * 16 * div_std); 314 sccnxp_update_best_err(baud, bestbaud, &besterr); 315 csr = CSR_TIMER_MODE; 316 sccnxp_port_write(port, SCCNXP_CTPU_REG, div_std >> 8); 317 sccnxp_port_write(port, SCCNXP_CTPL_REG, div_std); 318 /* Issue start timer/counter command */ 319 sccnxp_port_read(port, SCCNXP_START_COUNTER_REG); 320 } 321 322 /* Find best baud from table */ 323 for (i = 0; baud_std[i].baud && besterr; i++) { 324 if (baud_std[i].mr0 && !(chip->flags & SCCNXP_HAVE_MR0)) 325 continue; 326 div_std = DIV_ROUND_CLOSEST(chip->freq_std, baud_std[i].baud); 327 tmp_baud = DIV_ROUND_CLOSEST(port->uartclk, div_std); 328 if (!sccnxp_update_best_err(baud, tmp_baud, &besterr)) { 329 acr = baud_std[i].acr; 330 csr = baud_std[i].csr; 331 mr0 = baud_std[i].mr0; 332 bestbaud = tmp_baud; 333 } 334 } 335 336 if (chip->flags & SCCNXP_HAVE_MR0) { 337 /* Enable FIFO, set half level for TX */ 338 mr0 |= MR0_FIFO | MR0_TXLVL; 339 /* Update MR0 */ 340 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR0); 341 sccnxp_port_write(port, SCCNXP_MR_REG, mr0); 342 } 343 344 sccnxp_port_write(port, SCCNXP_ACR_REG, acr | ACR_TIMER_MODE); 345 sccnxp_port_write(port, SCCNXP_CSR_REG, (csr << 4) | csr); 346 347 if (baud != bestbaud) 348 dev_dbg(port->dev, "Baudrate desired: %i, calculated: %i\n", 349 baud, bestbaud); 350 351 return bestbaud; 352 } 353 354 static void sccnxp_enable_irq(struct uart_port *port, int mask) 355 { 356 struct sccnxp_port *s = dev_get_drvdata(port->dev); 357 358 s->imr |= mask << (port->line * 4); 359 sccnxp_write(port, SCCNXP_IMR_REG, s->imr); 360 } 361 362 static void sccnxp_disable_irq(struct uart_port *port, int mask) 363 { 364 struct sccnxp_port *s = dev_get_drvdata(port->dev); 365 366 s->imr &= ~(mask << (port->line * 4)); 367 sccnxp_write(port, SCCNXP_IMR_REG, s->imr); 368 } 369 370 static void sccnxp_set_bit(struct uart_port *port, int sig, int state) 371 { 372 u8 bitmask; 373 struct sccnxp_port *s = dev_get_drvdata(port->dev); 374 375 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(sig)) { 376 bitmask = 1 << MCTRL_OBIT(s->pdata.mctrl_cfg[port->line], sig); 377 if (state) 378 sccnxp_write(port, SCCNXP_SOP_REG, bitmask); 379 else 380 sccnxp_write(port, SCCNXP_ROP_REG, bitmask); 381 } 382 } 383 384 static void sccnxp_handle_rx(struct uart_port *port) 385 { 386 u8 sr; 387 unsigned int ch, flag; 388 389 for (;;) { 390 sr = sccnxp_port_read(port, SCCNXP_SR_REG); 391 if (!(sr & SR_RXRDY)) 392 break; 393 sr &= SR_PE | SR_FE | SR_OVR | SR_BRK; 394 395 ch = sccnxp_port_read(port, SCCNXP_RHR_REG); 396 397 port->icount.rx++; 398 flag = TTY_NORMAL; 399 400 if (unlikely(sr)) { 401 if (sr & SR_BRK) { 402 port->icount.brk++; 403 sccnxp_port_write(port, SCCNXP_CR_REG, 404 CR_CMD_BREAK_RESET); 405 if (uart_handle_break(port)) 406 continue; 407 } else if (sr & SR_PE) 408 port->icount.parity++; 409 else if (sr & SR_FE) 410 port->icount.frame++; 411 else if (sr & SR_OVR) { 412 port->icount.overrun++; 413 sccnxp_port_write(port, SCCNXP_CR_REG, 414 CR_CMD_STATUS_RESET); 415 } 416 417 sr &= port->read_status_mask; 418 if (sr & SR_BRK) 419 flag = TTY_BREAK; 420 else if (sr & SR_PE) 421 flag = TTY_PARITY; 422 else if (sr & SR_FE) 423 flag = TTY_FRAME; 424 else if (sr & SR_OVR) 425 flag = TTY_OVERRUN; 426 } 427 428 if (uart_handle_sysrq_char(port, ch)) 429 continue; 430 431 if (sr & port->ignore_status_mask) 432 continue; 433 434 uart_insert_char(port, sr, SR_OVR, ch, flag); 435 } 436 437 tty_flip_buffer_push(&port->state->port); 438 } 439 440 static void sccnxp_handle_tx(struct uart_port *port) 441 { 442 u8 sr; 443 struct circ_buf *xmit = &port->state->xmit; 444 struct sccnxp_port *s = dev_get_drvdata(port->dev); 445 446 if (unlikely(port->x_char)) { 447 sccnxp_port_write(port, SCCNXP_THR_REG, port->x_char); 448 port->icount.tx++; 449 port->x_char = 0; 450 return; 451 } 452 453 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { 454 /* Disable TX if FIFO is empty */ 455 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) { 456 sccnxp_disable_irq(port, IMR_TXRDY); 457 458 /* Set direction to input */ 459 if (s->chip->flags & SCCNXP_HAVE_IO) 460 sccnxp_set_bit(port, DIR_OP, 0); 461 } 462 return; 463 } 464 465 while (!uart_circ_empty(xmit)) { 466 sr = sccnxp_port_read(port, SCCNXP_SR_REG); 467 if (!(sr & SR_TXRDY)) 468 break; 469 470 sccnxp_port_write(port, SCCNXP_THR_REG, xmit->buf[xmit->tail]); 471 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 472 port->icount.tx++; 473 } 474 475 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 476 uart_write_wakeup(port); 477 } 478 479 static void sccnxp_handle_events(struct sccnxp_port *s) 480 { 481 int i; 482 u8 isr; 483 484 do { 485 isr = sccnxp_read(&s->port[0], SCCNXP_ISR_REG); 486 isr &= s->imr; 487 if (!isr) 488 break; 489 490 for (i = 0; i < s->uart.nr; i++) { 491 if (s->opened[i] && (isr & ISR_RXRDY(i))) 492 sccnxp_handle_rx(&s->port[i]); 493 if (s->opened[i] && (isr & ISR_TXRDY(i))) 494 sccnxp_handle_tx(&s->port[i]); 495 } 496 } while (1); 497 } 498 499 static void sccnxp_timer(struct timer_list *t) 500 { 501 struct sccnxp_port *s = from_timer(s, t, timer); 502 unsigned long flags; 503 504 spin_lock_irqsave(&s->lock, flags); 505 sccnxp_handle_events(s); 506 spin_unlock_irqrestore(&s->lock, flags); 507 508 mod_timer(&s->timer, jiffies + usecs_to_jiffies(s->pdata.poll_time_us)); 509 } 510 511 static irqreturn_t sccnxp_ist(int irq, void *dev_id) 512 { 513 struct sccnxp_port *s = (struct sccnxp_port *)dev_id; 514 unsigned long flags; 515 516 spin_lock_irqsave(&s->lock, flags); 517 sccnxp_handle_events(s); 518 spin_unlock_irqrestore(&s->lock, flags); 519 520 return IRQ_HANDLED; 521 } 522 523 static void sccnxp_start_tx(struct uart_port *port) 524 { 525 struct sccnxp_port *s = dev_get_drvdata(port->dev); 526 unsigned long flags; 527 528 spin_lock_irqsave(&s->lock, flags); 529 530 /* Set direction to output */ 531 if (s->chip->flags & SCCNXP_HAVE_IO) 532 sccnxp_set_bit(port, DIR_OP, 1); 533 534 sccnxp_enable_irq(port, IMR_TXRDY); 535 536 spin_unlock_irqrestore(&s->lock, flags); 537 } 538 539 static void sccnxp_stop_tx(struct uart_port *port) 540 { 541 /* Do nothing */ 542 } 543 544 static void sccnxp_stop_rx(struct uart_port *port) 545 { 546 struct sccnxp_port *s = dev_get_drvdata(port->dev); 547 unsigned long flags; 548 549 spin_lock_irqsave(&s->lock, flags); 550 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE); 551 spin_unlock_irqrestore(&s->lock, flags); 552 } 553 554 static unsigned int sccnxp_tx_empty(struct uart_port *port) 555 { 556 u8 val; 557 unsigned long flags; 558 struct sccnxp_port *s = dev_get_drvdata(port->dev); 559 560 spin_lock_irqsave(&s->lock, flags); 561 val = sccnxp_port_read(port, SCCNXP_SR_REG); 562 spin_unlock_irqrestore(&s->lock, flags); 563 564 return (val & SR_TXEMT) ? TIOCSER_TEMT : 0; 565 } 566 567 static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl) 568 { 569 struct sccnxp_port *s = dev_get_drvdata(port->dev); 570 unsigned long flags; 571 572 if (!(s->chip->flags & SCCNXP_HAVE_IO)) 573 return; 574 575 spin_lock_irqsave(&s->lock, flags); 576 577 sccnxp_set_bit(port, DTR_OP, mctrl & TIOCM_DTR); 578 sccnxp_set_bit(port, RTS_OP, mctrl & TIOCM_RTS); 579 580 spin_unlock_irqrestore(&s->lock, flags); 581 } 582 583 static unsigned int sccnxp_get_mctrl(struct uart_port *port) 584 { 585 u8 bitmask, ipr; 586 unsigned long flags; 587 struct sccnxp_port *s = dev_get_drvdata(port->dev); 588 unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR; 589 590 if (!(s->chip->flags & SCCNXP_HAVE_IO)) 591 return mctrl; 592 593 spin_lock_irqsave(&s->lock, flags); 594 595 ipr = ~sccnxp_read(port, SCCNXP_IPCR_REG); 596 597 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DSR_IP)) { 598 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 599 DSR_IP); 600 mctrl &= ~TIOCM_DSR; 601 mctrl |= (ipr & bitmask) ? TIOCM_DSR : 0; 602 } 603 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(CTS_IP)) { 604 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 605 CTS_IP); 606 mctrl &= ~TIOCM_CTS; 607 mctrl |= (ipr & bitmask) ? TIOCM_CTS : 0; 608 } 609 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DCD_IP)) { 610 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 611 DCD_IP); 612 mctrl &= ~TIOCM_CAR; 613 mctrl |= (ipr & bitmask) ? TIOCM_CAR : 0; 614 } 615 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(RNG_IP)) { 616 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 617 RNG_IP); 618 mctrl &= ~TIOCM_RNG; 619 mctrl |= (ipr & bitmask) ? TIOCM_RNG : 0; 620 } 621 622 spin_unlock_irqrestore(&s->lock, flags); 623 624 return mctrl; 625 } 626 627 static void sccnxp_break_ctl(struct uart_port *port, int break_state) 628 { 629 struct sccnxp_port *s = dev_get_drvdata(port->dev); 630 unsigned long flags; 631 632 spin_lock_irqsave(&s->lock, flags); 633 sccnxp_port_write(port, SCCNXP_CR_REG, break_state ? 634 CR_CMD_START_BREAK : CR_CMD_STOP_BREAK); 635 spin_unlock_irqrestore(&s->lock, flags); 636 } 637 638 static void sccnxp_set_termios(struct uart_port *port, 639 struct ktermios *termios, 640 const struct ktermios *old) 641 { 642 struct sccnxp_port *s = dev_get_drvdata(port->dev); 643 unsigned long flags; 644 u8 mr1, mr2; 645 int baud; 646 647 spin_lock_irqsave(&s->lock, flags); 648 649 /* Mask termios capabilities we don't support */ 650 termios->c_cflag &= ~CMSPAR; 651 652 /* Disable RX & TX, reset break condition, status and FIFOs */ 653 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET | 654 CR_RX_DISABLE | CR_TX_DISABLE); 655 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET); 656 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET); 657 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET); 658 659 /* Word size */ 660 switch (termios->c_cflag & CSIZE) { 661 case CS5: 662 mr1 = MR1_BITS_5; 663 break; 664 case CS6: 665 mr1 = MR1_BITS_6; 666 break; 667 case CS7: 668 mr1 = MR1_BITS_7; 669 break; 670 case CS8: 671 default: 672 mr1 = MR1_BITS_8; 673 break; 674 } 675 676 /* Parity */ 677 if (termios->c_cflag & PARENB) { 678 if (termios->c_cflag & PARODD) 679 mr1 |= MR1_PAR_ODD; 680 } else 681 mr1 |= MR1_PAR_NO; 682 683 /* Stop bits */ 684 mr2 = (termios->c_cflag & CSTOPB) ? MR2_STOP2 : MR2_STOP1; 685 686 /* Update desired format */ 687 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR1); 688 sccnxp_port_write(port, SCCNXP_MR_REG, mr1); 689 sccnxp_port_write(port, SCCNXP_MR_REG, mr2); 690 691 /* Set read status mask */ 692 port->read_status_mask = SR_OVR; 693 if (termios->c_iflag & INPCK) 694 port->read_status_mask |= SR_PE | SR_FE; 695 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) 696 port->read_status_mask |= SR_BRK; 697 698 /* Set status ignore mask */ 699 port->ignore_status_mask = 0; 700 if (termios->c_iflag & IGNBRK) 701 port->ignore_status_mask |= SR_BRK; 702 if (termios->c_iflag & IGNPAR) 703 port->ignore_status_mask |= SR_PE; 704 if (!(termios->c_cflag & CREAD)) 705 port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK; 706 707 /* Setup baudrate */ 708 baud = uart_get_baud_rate(port, termios, old, 50, 709 (s->chip->flags & SCCNXP_HAVE_MR0) ? 710 230400 : 38400); 711 baud = sccnxp_set_baud(port, baud); 712 713 /* Update timeout according to new baud rate */ 714 uart_update_timeout(port, termios->c_cflag, baud); 715 716 /* Report actual baudrate back to core */ 717 if (tty_termios_baud_rate(termios)) 718 tty_termios_encode_baud_rate(termios, baud, baud); 719 720 /* Enable RX & TX */ 721 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE); 722 723 spin_unlock_irqrestore(&s->lock, flags); 724 } 725 726 static int sccnxp_startup(struct uart_port *port) 727 { 728 struct sccnxp_port *s = dev_get_drvdata(port->dev); 729 unsigned long flags; 730 731 spin_lock_irqsave(&s->lock, flags); 732 733 if (s->chip->flags & SCCNXP_HAVE_IO) { 734 /* Outputs are controlled manually */ 735 sccnxp_write(port, SCCNXP_OPCR_REG, 0); 736 } 737 738 /* Reset break condition, status and FIFOs */ 739 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET); 740 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET); 741 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET); 742 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET); 743 744 /* Enable RX & TX */ 745 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE); 746 747 /* Enable RX interrupt */ 748 sccnxp_enable_irq(port, IMR_RXRDY); 749 750 s->opened[port->line] = 1; 751 752 spin_unlock_irqrestore(&s->lock, flags); 753 754 return 0; 755 } 756 757 static void sccnxp_shutdown(struct uart_port *port) 758 { 759 struct sccnxp_port *s = dev_get_drvdata(port->dev); 760 unsigned long flags; 761 762 spin_lock_irqsave(&s->lock, flags); 763 764 s->opened[port->line] = 0; 765 766 /* Disable interrupts */ 767 sccnxp_disable_irq(port, IMR_TXRDY | IMR_RXRDY); 768 769 /* Disable TX & RX */ 770 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE); 771 772 /* Leave direction to input */ 773 if (s->chip->flags & SCCNXP_HAVE_IO) 774 sccnxp_set_bit(port, DIR_OP, 0); 775 776 spin_unlock_irqrestore(&s->lock, flags); 777 } 778 779 static const char *sccnxp_type(struct uart_port *port) 780 { 781 struct sccnxp_port *s = dev_get_drvdata(port->dev); 782 783 return (port->type == PORT_SC26XX) ? s->chip->name : NULL; 784 } 785 786 static void sccnxp_release_port(struct uart_port *port) 787 { 788 /* Do nothing */ 789 } 790 791 static int sccnxp_request_port(struct uart_port *port) 792 { 793 /* Do nothing */ 794 return 0; 795 } 796 797 static void sccnxp_config_port(struct uart_port *port, int flags) 798 { 799 if (flags & UART_CONFIG_TYPE) 800 port->type = PORT_SC26XX; 801 } 802 803 static int sccnxp_verify_port(struct uart_port *port, struct serial_struct *s) 804 { 805 if ((s->type == PORT_UNKNOWN) || (s->type == PORT_SC26XX)) 806 return 0; 807 if (s->irq == port->irq) 808 return 0; 809 810 return -EINVAL; 811 } 812 813 static const struct uart_ops sccnxp_ops = { 814 .tx_empty = sccnxp_tx_empty, 815 .set_mctrl = sccnxp_set_mctrl, 816 .get_mctrl = sccnxp_get_mctrl, 817 .stop_tx = sccnxp_stop_tx, 818 .start_tx = sccnxp_start_tx, 819 .stop_rx = sccnxp_stop_rx, 820 .break_ctl = sccnxp_break_ctl, 821 .startup = sccnxp_startup, 822 .shutdown = sccnxp_shutdown, 823 .set_termios = sccnxp_set_termios, 824 .type = sccnxp_type, 825 .release_port = sccnxp_release_port, 826 .request_port = sccnxp_request_port, 827 .config_port = sccnxp_config_port, 828 .verify_port = sccnxp_verify_port, 829 }; 830 831 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE 832 static void sccnxp_console_putchar(struct uart_port *port, unsigned char c) 833 { 834 int tryes = 100000; 835 836 while (tryes--) { 837 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXRDY) { 838 sccnxp_port_write(port, SCCNXP_THR_REG, c); 839 break; 840 } 841 barrier(); 842 } 843 } 844 845 static void sccnxp_console_write(struct console *co, const char *c, unsigned n) 846 { 847 struct sccnxp_port *s = (struct sccnxp_port *)co->data; 848 struct uart_port *port = &s->port[co->index]; 849 unsigned long flags; 850 851 spin_lock_irqsave(&s->lock, flags); 852 uart_console_write(port, c, n, sccnxp_console_putchar); 853 spin_unlock_irqrestore(&s->lock, flags); 854 } 855 856 static int sccnxp_console_setup(struct console *co, char *options) 857 { 858 struct sccnxp_port *s = (struct sccnxp_port *)co->data; 859 struct uart_port *port = &s->port[(co->index > 0) ? co->index : 0]; 860 int baud = 9600, bits = 8, parity = 'n', flow = 'n'; 861 862 if (options) 863 uart_parse_options(options, &baud, &parity, &bits, &flow); 864 865 return uart_set_options(port, co, baud, parity, bits, flow); 866 } 867 #endif 868 869 static const struct platform_device_id sccnxp_id_table[] = { 870 { .name = "sc2681", .driver_data = (kernel_ulong_t)&sc2681, }, 871 { .name = "sc2691", .driver_data = (kernel_ulong_t)&sc2691, }, 872 { .name = "sc2692", .driver_data = (kernel_ulong_t)&sc2692, }, 873 { .name = "sc2891", .driver_data = (kernel_ulong_t)&sc2891, }, 874 { .name = "sc2892", .driver_data = (kernel_ulong_t)&sc2892, }, 875 { .name = "sc28202", .driver_data = (kernel_ulong_t)&sc28202, }, 876 { .name = "sc68681", .driver_data = (kernel_ulong_t)&sc68681, }, 877 { .name = "sc68692", .driver_data = (kernel_ulong_t)&sc68692, }, 878 { } 879 }; 880 MODULE_DEVICE_TABLE(platform, sccnxp_id_table); 881 882 static int sccnxp_probe(struct platform_device *pdev) 883 { 884 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 885 struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev); 886 int i, ret, uartclk; 887 struct sccnxp_port *s; 888 void __iomem *membase; 889 struct clk *clk; 890 891 membase = devm_ioremap_resource(&pdev->dev, res); 892 if (IS_ERR(membase)) 893 return PTR_ERR(membase); 894 895 s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL); 896 if (!s) { 897 dev_err(&pdev->dev, "Error allocating port structure\n"); 898 return -ENOMEM; 899 } 900 platform_set_drvdata(pdev, s); 901 902 spin_lock_init(&s->lock); 903 904 s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data; 905 906 s->regulator = devm_regulator_get(&pdev->dev, "vcc"); 907 if (!IS_ERR(s->regulator)) { 908 ret = regulator_enable(s->regulator); 909 if (ret) { 910 dev_err(&pdev->dev, 911 "Failed to enable regulator: %i\n", ret); 912 return ret; 913 } 914 } else if (PTR_ERR(s->regulator) == -EPROBE_DEFER) 915 return -EPROBE_DEFER; 916 917 clk = devm_clk_get(&pdev->dev, NULL); 918 if (IS_ERR(clk)) { 919 ret = PTR_ERR(clk); 920 if (ret == -EPROBE_DEFER) 921 goto err_out; 922 uartclk = 0; 923 } else { 924 ret = clk_prepare_enable(clk); 925 if (ret) 926 goto err_out; 927 928 ret = devm_add_action_or_reset(&pdev->dev, 929 (void(*)(void *))clk_disable_unprepare, 930 clk); 931 if (ret) 932 goto err_out; 933 934 uartclk = clk_get_rate(clk); 935 } 936 937 if (!uartclk) { 938 dev_notice(&pdev->dev, "Using default clock frequency\n"); 939 uartclk = s->chip->freq_std; 940 } 941 942 /* Check input frequency */ 943 if ((uartclk < s->chip->freq_min) || (uartclk > s->chip->freq_max)) { 944 dev_err(&pdev->dev, "Frequency out of bounds\n"); 945 ret = -EINVAL; 946 goto err_out; 947 } 948 949 if (pdata) 950 memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata)); 951 952 if (s->pdata.poll_time_us) { 953 dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n", 954 s->pdata.poll_time_us); 955 s->poll = 1; 956 } 957 958 if (!s->poll) { 959 s->irq = platform_get_irq(pdev, 0); 960 if (s->irq < 0) { 961 ret = -ENXIO; 962 goto err_out; 963 } 964 } 965 966 s->uart.owner = THIS_MODULE; 967 s->uart.dev_name = "ttySC"; 968 s->uart.major = SCCNXP_MAJOR; 969 s->uart.minor = SCCNXP_MINOR; 970 s->uart.nr = s->chip->nr; 971 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE 972 s->uart.cons = &s->console; 973 s->uart.cons->device = uart_console_device; 974 s->uart.cons->write = sccnxp_console_write; 975 s->uart.cons->setup = sccnxp_console_setup; 976 s->uart.cons->flags = CON_PRINTBUFFER; 977 s->uart.cons->index = -1; 978 s->uart.cons->data = s; 979 strcpy(s->uart.cons->name, "ttySC"); 980 #endif 981 ret = uart_register_driver(&s->uart); 982 if (ret) { 983 dev_err(&pdev->dev, "Registering UART driver failed\n"); 984 goto err_out; 985 } 986 987 for (i = 0; i < s->uart.nr; i++) { 988 s->port[i].line = i; 989 s->port[i].dev = &pdev->dev; 990 s->port[i].irq = s->irq; 991 s->port[i].type = PORT_SC26XX; 992 s->port[i].fifosize = s->chip->fifosize; 993 s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE; 994 s->port[i].iotype = UPIO_MEM; 995 s->port[i].mapbase = res->start; 996 s->port[i].membase = membase; 997 s->port[i].regshift = s->pdata.reg_shift; 998 s->port[i].uartclk = uartclk; 999 s->port[i].ops = &sccnxp_ops; 1000 s->port[i].has_sysrq = IS_ENABLED(CONFIG_SERIAL_SCCNXP_CONSOLE); 1001 uart_add_one_port(&s->uart, &s->port[i]); 1002 /* Set direction to input */ 1003 if (s->chip->flags & SCCNXP_HAVE_IO) 1004 sccnxp_set_bit(&s->port[i], DIR_OP, 0); 1005 } 1006 1007 /* Disable interrupts */ 1008 s->imr = 0; 1009 sccnxp_write(&s->port[0], SCCNXP_IMR_REG, 0); 1010 1011 if (!s->poll) { 1012 ret = devm_request_threaded_irq(&pdev->dev, s->irq, NULL, 1013 sccnxp_ist, 1014 IRQF_TRIGGER_FALLING | 1015 IRQF_ONESHOT, 1016 dev_name(&pdev->dev), s); 1017 if (!ret) 1018 return 0; 1019 1020 dev_err(&pdev->dev, "Unable to reguest IRQ %i\n", s->irq); 1021 } else { 1022 timer_setup(&s->timer, sccnxp_timer, 0); 1023 mod_timer(&s->timer, jiffies + 1024 usecs_to_jiffies(s->pdata.poll_time_us)); 1025 return 0; 1026 } 1027 1028 uart_unregister_driver(&s->uart); 1029 err_out: 1030 if (!IS_ERR(s->regulator)) 1031 regulator_disable(s->regulator); 1032 1033 return ret; 1034 } 1035 1036 static int sccnxp_remove(struct platform_device *pdev) 1037 { 1038 int i; 1039 struct sccnxp_port *s = platform_get_drvdata(pdev); 1040 1041 if (!s->poll) 1042 devm_free_irq(&pdev->dev, s->irq, s); 1043 else 1044 del_timer_sync(&s->timer); 1045 1046 for (i = 0; i < s->uart.nr; i++) 1047 uart_remove_one_port(&s->uart, &s->port[i]); 1048 1049 uart_unregister_driver(&s->uart); 1050 1051 if (!IS_ERR(s->regulator)) 1052 return regulator_disable(s->regulator); 1053 1054 return 0; 1055 } 1056 1057 static struct platform_driver sccnxp_uart_driver = { 1058 .driver = { 1059 .name = SCCNXP_NAME, 1060 }, 1061 .probe = sccnxp_probe, 1062 .remove = sccnxp_remove, 1063 .id_table = sccnxp_id_table, 1064 }; 1065 module_platform_driver(sccnxp_uart_driver); 1066 1067 MODULE_LICENSE("GPL v2"); 1068 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 1069 MODULE_DESCRIPTION("SCCNXP serial driver"); 1070