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 uart_xmit_advance(port, 1); 472 } 473 474 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 475 uart_write_wakeup(port); 476 } 477 478 static void sccnxp_handle_events(struct sccnxp_port *s) 479 { 480 int i; 481 u8 isr; 482 483 do { 484 isr = sccnxp_read(&s->port[0], SCCNXP_ISR_REG); 485 isr &= s->imr; 486 if (!isr) 487 break; 488 489 for (i = 0; i < s->uart.nr; i++) { 490 if (s->opened[i] && (isr & ISR_RXRDY(i))) 491 sccnxp_handle_rx(&s->port[i]); 492 if (s->opened[i] && (isr & ISR_TXRDY(i))) 493 sccnxp_handle_tx(&s->port[i]); 494 } 495 } while (1); 496 } 497 498 static void sccnxp_timer(struct timer_list *t) 499 { 500 struct sccnxp_port *s = from_timer(s, t, timer); 501 unsigned long flags; 502 503 spin_lock_irqsave(&s->lock, flags); 504 sccnxp_handle_events(s); 505 spin_unlock_irqrestore(&s->lock, flags); 506 507 mod_timer(&s->timer, jiffies + usecs_to_jiffies(s->pdata.poll_time_us)); 508 } 509 510 static irqreturn_t sccnxp_ist(int irq, void *dev_id) 511 { 512 struct sccnxp_port *s = (struct sccnxp_port *)dev_id; 513 unsigned long flags; 514 515 spin_lock_irqsave(&s->lock, flags); 516 sccnxp_handle_events(s); 517 spin_unlock_irqrestore(&s->lock, flags); 518 519 return IRQ_HANDLED; 520 } 521 522 static void sccnxp_start_tx(struct uart_port *port) 523 { 524 struct sccnxp_port *s = dev_get_drvdata(port->dev); 525 unsigned long flags; 526 527 spin_lock_irqsave(&s->lock, flags); 528 529 /* Set direction to output */ 530 if (s->chip->flags & SCCNXP_HAVE_IO) 531 sccnxp_set_bit(port, DIR_OP, 1); 532 533 sccnxp_enable_irq(port, IMR_TXRDY); 534 535 spin_unlock_irqrestore(&s->lock, flags); 536 } 537 538 static void sccnxp_stop_tx(struct uart_port *port) 539 { 540 /* Do nothing */ 541 } 542 543 static void sccnxp_stop_rx(struct uart_port *port) 544 { 545 struct sccnxp_port *s = dev_get_drvdata(port->dev); 546 unsigned long flags; 547 548 spin_lock_irqsave(&s->lock, flags); 549 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE); 550 spin_unlock_irqrestore(&s->lock, flags); 551 } 552 553 static unsigned int sccnxp_tx_empty(struct uart_port *port) 554 { 555 u8 val; 556 unsigned long flags; 557 struct sccnxp_port *s = dev_get_drvdata(port->dev); 558 559 spin_lock_irqsave(&s->lock, flags); 560 val = sccnxp_port_read(port, SCCNXP_SR_REG); 561 spin_unlock_irqrestore(&s->lock, flags); 562 563 return (val & SR_TXEMT) ? TIOCSER_TEMT : 0; 564 } 565 566 static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl) 567 { 568 struct sccnxp_port *s = dev_get_drvdata(port->dev); 569 unsigned long flags; 570 571 if (!(s->chip->flags & SCCNXP_HAVE_IO)) 572 return; 573 574 spin_lock_irqsave(&s->lock, flags); 575 576 sccnxp_set_bit(port, DTR_OP, mctrl & TIOCM_DTR); 577 sccnxp_set_bit(port, RTS_OP, mctrl & TIOCM_RTS); 578 579 spin_unlock_irqrestore(&s->lock, flags); 580 } 581 582 static unsigned int sccnxp_get_mctrl(struct uart_port *port) 583 { 584 u8 bitmask, ipr; 585 unsigned long flags; 586 struct sccnxp_port *s = dev_get_drvdata(port->dev); 587 unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR; 588 589 if (!(s->chip->flags & SCCNXP_HAVE_IO)) 590 return mctrl; 591 592 spin_lock_irqsave(&s->lock, flags); 593 594 ipr = ~sccnxp_read(port, SCCNXP_IPCR_REG); 595 596 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DSR_IP)) { 597 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 598 DSR_IP); 599 mctrl &= ~TIOCM_DSR; 600 mctrl |= (ipr & bitmask) ? TIOCM_DSR : 0; 601 } 602 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(CTS_IP)) { 603 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 604 CTS_IP); 605 mctrl &= ~TIOCM_CTS; 606 mctrl |= (ipr & bitmask) ? TIOCM_CTS : 0; 607 } 608 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DCD_IP)) { 609 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 610 DCD_IP); 611 mctrl &= ~TIOCM_CAR; 612 mctrl |= (ipr & bitmask) ? TIOCM_CAR : 0; 613 } 614 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(RNG_IP)) { 615 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 616 RNG_IP); 617 mctrl &= ~TIOCM_RNG; 618 mctrl |= (ipr & bitmask) ? TIOCM_RNG : 0; 619 } 620 621 spin_unlock_irqrestore(&s->lock, flags); 622 623 return mctrl; 624 } 625 626 static void sccnxp_break_ctl(struct uart_port *port, int break_state) 627 { 628 struct sccnxp_port *s = dev_get_drvdata(port->dev); 629 unsigned long flags; 630 631 spin_lock_irqsave(&s->lock, flags); 632 sccnxp_port_write(port, SCCNXP_CR_REG, break_state ? 633 CR_CMD_START_BREAK : CR_CMD_STOP_BREAK); 634 spin_unlock_irqrestore(&s->lock, flags); 635 } 636 637 static void sccnxp_set_termios(struct uart_port *port, 638 struct ktermios *termios, 639 const struct ktermios *old) 640 { 641 struct sccnxp_port *s = dev_get_drvdata(port->dev); 642 unsigned long flags; 643 u8 mr1, mr2; 644 int baud; 645 646 spin_lock_irqsave(&s->lock, flags); 647 648 /* Mask termios capabilities we don't support */ 649 termios->c_cflag &= ~CMSPAR; 650 651 /* Disable RX & TX, reset break condition, status and FIFOs */ 652 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET | 653 CR_RX_DISABLE | CR_TX_DISABLE); 654 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET); 655 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET); 656 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET); 657 658 /* Word size */ 659 switch (termios->c_cflag & CSIZE) { 660 case CS5: 661 mr1 = MR1_BITS_5; 662 break; 663 case CS6: 664 mr1 = MR1_BITS_6; 665 break; 666 case CS7: 667 mr1 = MR1_BITS_7; 668 break; 669 case CS8: 670 default: 671 mr1 = MR1_BITS_8; 672 break; 673 } 674 675 /* Parity */ 676 if (termios->c_cflag & PARENB) { 677 if (termios->c_cflag & PARODD) 678 mr1 |= MR1_PAR_ODD; 679 } else 680 mr1 |= MR1_PAR_NO; 681 682 /* Stop bits */ 683 mr2 = (termios->c_cflag & CSTOPB) ? MR2_STOP2 : MR2_STOP1; 684 685 /* Update desired format */ 686 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR1); 687 sccnxp_port_write(port, SCCNXP_MR_REG, mr1); 688 sccnxp_port_write(port, SCCNXP_MR_REG, mr2); 689 690 /* Set read status mask */ 691 port->read_status_mask = SR_OVR; 692 if (termios->c_iflag & INPCK) 693 port->read_status_mask |= SR_PE | SR_FE; 694 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) 695 port->read_status_mask |= SR_BRK; 696 697 /* Set status ignore mask */ 698 port->ignore_status_mask = 0; 699 if (termios->c_iflag & IGNBRK) 700 port->ignore_status_mask |= SR_BRK; 701 if (termios->c_iflag & IGNPAR) 702 port->ignore_status_mask |= SR_PE; 703 if (!(termios->c_cflag & CREAD)) 704 port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK; 705 706 /* Setup baudrate */ 707 baud = uart_get_baud_rate(port, termios, old, 50, 708 (s->chip->flags & SCCNXP_HAVE_MR0) ? 709 230400 : 38400); 710 baud = sccnxp_set_baud(port, baud); 711 712 /* Update timeout according to new baud rate */ 713 uart_update_timeout(port, termios->c_cflag, baud); 714 715 /* Report actual baudrate back to core */ 716 if (tty_termios_baud_rate(termios)) 717 tty_termios_encode_baud_rate(termios, baud, baud); 718 719 /* Enable RX & TX */ 720 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE); 721 722 spin_unlock_irqrestore(&s->lock, flags); 723 } 724 725 static int sccnxp_startup(struct uart_port *port) 726 { 727 struct sccnxp_port *s = dev_get_drvdata(port->dev); 728 unsigned long flags; 729 730 spin_lock_irqsave(&s->lock, flags); 731 732 if (s->chip->flags & SCCNXP_HAVE_IO) { 733 /* Outputs are controlled manually */ 734 sccnxp_write(port, SCCNXP_OPCR_REG, 0); 735 } 736 737 /* Reset break condition, status and FIFOs */ 738 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET); 739 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET); 740 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET); 741 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET); 742 743 /* Enable RX & TX */ 744 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE); 745 746 /* Enable RX interrupt */ 747 sccnxp_enable_irq(port, IMR_RXRDY); 748 749 s->opened[port->line] = 1; 750 751 spin_unlock_irqrestore(&s->lock, flags); 752 753 return 0; 754 } 755 756 static void sccnxp_shutdown(struct uart_port *port) 757 { 758 struct sccnxp_port *s = dev_get_drvdata(port->dev); 759 unsigned long flags; 760 761 spin_lock_irqsave(&s->lock, flags); 762 763 s->opened[port->line] = 0; 764 765 /* Disable interrupts */ 766 sccnxp_disable_irq(port, IMR_TXRDY | IMR_RXRDY); 767 768 /* Disable TX & RX */ 769 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE); 770 771 /* Leave direction to input */ 772 if (s->chip->flags & SCCNXP_HAVE_IO) 773 sccnxp_set_bit(port, DIR_OP, 0); 774 775 spin_unlock_irqrestore(&s->lock, flags); 776 } 777 778 static const char *sccnxp_type(struct uart_port *port) 779 { 780 struct sccnxp_port *s = dev_get_drvdata(port->dev); 781 782 return (port->type == PORT_SC26XX) ? s->chip->name : NULL; 783 } 784 785 static void sccnxp_release_port(struct uart_port *port) 786 { 787 /* Do nothing */ 788 } 789 790 static int sccnxp_request_port(struct uart_port *port) 791 { 792 /* Do nothing */ 793 return 0; 794 } 795 796 static void sccnxp_config_port(struct uart_port *port, int flags) 797 { 798 if (flags & UART_CONFIG_TYPE) 799 port->type = PORT_SC26XX; 800 } 801 802 static int sccnxp_verify_port(struct uart_port *port, struct serial_struct *s) 803 { 804 if ((s->type == PORT_UNKNOWN) || (s->type == PORT_SC26XX)) 805 return 0; 806 if (s->irq == port->irq) 807 return 0; 808 809 return -EINVAL; 810 } 811 812 static const struct uart_ops sccnxp_ops = { 813 .tx_empty = sccnxp_tx_empty, 814 .set_mctrl = sccnxp_set_mctrl, 815 .get_mctrl = sccnxp_get_mctrl, 816 .stop_tx = sccnxp_stop_tx, 817 .start_tx = sccnxp_start_tx, 818 .stop_rx = sccnxp_stop_rx, 819 .break_ctl = sccnxp_break_ctl, 820 .startup = sccnxp_startup, 821 .shutdown = sccnxp_shutdown, 822 .set_termios = sccnxp_set_termios, 823 .type = sccnxp_type, 824 .release_port = sccnxp_release_port, 825 .request_port = sccnxp_request_port, 826 .config_port = sccnxp_config_port, 827 .verify_port = sccnxp_verify_port, 828 }; 829 830 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE 831 static void sccnxp_console_putchar(struct uart_port *port, unsigned char c) 832 { 833 int tryes = 100000; 834 835 while (tryes--) { 836 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXRDY) { 837 sccnxp_port_write(port, SCCNXP_THR_REG, c); 838 break; 839 } 840 barrier(); 841 } 842 } 843 844 static void sccnxp_console_write(struct console *co, const char *c, unsigned n) 845 { 846 struct sccnxp_port *s = (struct sccnxp_port *)co->data; 847 struct uart_port *port = &s->port[co->index]; 848 unsigned long flags; 849 850 spin_lock_irqsave(&s->lock, flags); 851 uart_console_write(port, c, n, sccnxp_console_putchar); 852 spin_unlock_irqrestore(&s->lock, flags); 853 } 854 855 static int sccnxp_console_setup(struct console *co, char *options) 856 { 857 struct sccnxp_port *s = (struct sccnxp_port *)co->data; 858 struct uart_port *port = &s->port[(co->index > 0) ? co->index : 0]; 859 int baud = 9600, bits = 8, parity = 'n', flow = 'n'; 860 861 if (options) 862 uart_parse_options(options, &baud, &parity, &bits, &flow); 863 864 return uart_set_options(port, co, baud, parity, bits, flow); 865 } 866 #endif 867 868 static const struct platform_device_id sccnxp_id_table[] = { 869 { .name = "sc2681", .driver_data = (kernel_ulong_t)&sc2681, }, 870 { .name = "sc2691", .driver_data = (kernel_ulong_t)&sc2691, }, 871 { .name = "sc2692", .driver_data = (kernel_ulong_t)&sc2692, }, 872 { .name = "sc2891", .driver_data = (kernel_ulong_t)&sc2891, }, 873 { .name = "sc2892", .driver_data = (kernel_ulong_t)&sc2892, }, 874 { .name = "sc28202", .driver_data = (kernel_ulong_t)&sc28202, }, 875 { .name = "sc68681", .driver_data = (kernel_ulong_t)&sc68681, }, 876 { .name = "sc68692", .driver_data = (kernel_ulong_t)&sc68692, }, 877 { } 878 }; 879 MODULE_DEVICE_TABLE(platform, sccnxp_id_table); 880 881 static int sccnxp_probe(struct platform_device *pdev) 882 { 883 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 884 struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev); 885 int i, ret, uartclk; 886 struct sccnxp_port *s; 887 void __iomem *membase; 888 struct clk *clk; 889 890 membase = devm_ioremap_resource(&pdev->dev, res); 891 if (IS_ERR(membase)) 892 return PTR_ERR(membase); 893 894 s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL); 895 if (!s) { 896 dev_err(&pdev->dev, "Error allocating port structure\n"); 897 return -ENOMEM; 898 } 899 platform_set_drvdata(pdev, s); 900 901 spin_lock_init(&s->lock); 902 903 s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data; 904 905 s->regulator = devm_regulator_get(&pdev->dev, "vcc"); 906 if (!IS_ERR(s->regulator)) { 907 ret = regulator_enable(s->regulator); 908 if (ret) { 909 dev_err(&pdev->dev, 910 "Failed to enable regulator: %i\n", ret); 911 return ret; 912 } 913 } else if (PTR_ERR(s->regulator) == -EPROBE_DEFER) 914 return -EPROBE_DEFER; 915 916 clk = devm_clk_get_enabled(&pdev->dev, NULL); 917 if (IS_ERR(clk)) { 918 ret = PTR_ERR(clk); 919 if (ret == -EPROBE_DEFER) 920 goto err_out; 921 uartclk = 0; 922 } else { 923 uartclk = clk_get_rate(clk); 924 } 925 926 if (!uartclk) { 927 dev_notice(&pdev->dev, "Using default clock frequency\n"); 928 uartclk = s->chip->freq_std; 929 } 930 931 /* Check input frequency */ 932 if ((uartclk < s->chip->freq_min) || (uartclk > s->chip->freq_max)) { 933 dev_err(&pdev->dev, "Frequency out of bounds\n"); 934 ret = -EINVAL; 935 goto err_out; 936 } 937 938 if (pdata) 939 memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata)); 940 941 if (s->pdata.poll_time_us) { 942 dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n", 943 s->pdata.poll_time_us); 944 s->poll = 1; 945 } 946 947 if (!s->poll) { 948 s->irq = platform_get_irq(pdev, 0); 949 if (s->irq < 0) { 950 ret = -ENXIO; 951 goto err_out; 952 } 953 } 954 955 s->uart.owner = THIS_MODULE; 956 s->uart.dev_name = "ttySC"; 957 s->uart.major = SCCNXP_MAJOR; 958 s->uart.minor = SCCNXP_MINOR; 959 s->uart.nr = s->chip->nr; 960 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE 961 s->uart.cons = &s->console; 962 s->uart.cons->device = uart_console_device; 963 s->uart.cons->write = sccnxp_console_write; 964 s->uart.cons->setup = sccnxp_console_setup; 965 s->uart.cons->flags = CON_PRINTBUFFER; 966 s->uart.cons->index = -1; 967 s->uart.cons->data = s; 968 strcpy(s->uart.cons->name, "ttySC"); 969 #endif 970 ret = uart_register_driver(&s->uart); 971 if (ret) { 972 dev_err(&pdev->dev, "Registering UART driver failed\n"); 973 goto err_out; 974 } 975 976 for (i = 0; i < s->uart.nr; i++) { 977 s->port[i].line = i; 978 s->port[i].dev = &pdev->dev; 979 s->port[i].irq = s->irq; 980 s->port[i].type = PORT_SC26XX; 981 s->port[i].fifosize = s->chip->fifosize; 982 s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE; 983 s->port[i].iotype = UPIO_MEM; 984 s->port[i].mapbase = res->start; 985 s->port[i].membase = membase; 986 s->port[i].regshift = s->pdata.reg_shift; 987 s->port[i].uartclk = uartclk; 988 s->port[i].ops = &sccnxp_ops; 989 s->port[i].has_sysrq = IS_ENABLED(CONFIG_SERIAL_SCCNXP_CONSOLE); 990 uart_add_one_port(&s->uart, &s->port[i]); 991 /* Set direction to input */ 992 if (s->chip->flags & SCCNXP_HAVE_IO) 993 sccnxp_set_bit(&s->port[i], DIR_OP, 0); 994 } 995 996 /* Disable interrupts */ 997 s->imr = 0; 998 sccnxp_write(&s->port[0], SCCNXP_IMR_REG, 0); 999 1000 if (!s->poll) { 1001 ret = devm_request_threaded_irq(&pdev->dev, s->irq, NULL, 1002 sccnxp_ist, 1003 IRQF_TRIGGER_FALLING | 1004 IRQF_ONESHOT, 1005 dev_name(&pdev->dev), s); 1006 if (!ret) 1007 return 0; 1008 1009 dev_err(&pdev->dev, "Unable to reguest IRQ %i\n", s->irq); 1010 } else { 1011 timer_setup(&s->timer, sccnxp_timer, 0); 1012 mod_timer(&s->timer, jiffies + 1013 usecs_to_jiffies(s->pdata.poll_time_us)); 1014 return 0; 1015 } 1016 1017 uart_unregister_driver(&s->uart); 1018 err_out: 1019 if (!IS_ERR(s->regulator)) 1020 regulator_disable(s->regulator); 1021 1022 return ret; 1023 } 1024 1025 static int sccnxp_remove(struct platform_device *pdev) 1026 { 1027 int i; 1028 struct sccnxp_port *s = platform_get_drvdata(pdev); 1029 1030 if (!s->poll) 1031 devm_free_irq(&pdev->dev, s->irq, s); 1032 else 1033 del_timer_sync(&s->timer); 1034 1035 for (i = 0; i < s->uart.nr; i++) 1036 uart_remove_one_port(&s->uart, &s->port[i]); 1037 1038 uart_unregister_driver(&s->uart); 1039 1040 if (!IS_ERR(s->regulator)) 1041 return regulator_disable(s->regulator); 1042 1043 return 0; 1044 } 1045 1046 static struct platform_driver sccnxp_uart_driver = { 1047 .driver = { 1048 .name = SCCNXP_NAME, 1049 }, 1050 .probe = sccnxp_probe, 1051 .remove = sccnxp_remove, 1052 .id_table = sccnxp_id_table, 1053 }; 1054 module_platform_driver(sccnxp_uart_driver); 1055 1056 MODULE_LICENSE("GPL v2"); 1057 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 1058 MODULE_DESCRIPTION("SCCNXP serial driver"); 1059