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 Bogend��rfer (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 99struct 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 111struct 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 135static 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 146static 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 157static 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 168static 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 179static 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 190static 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 201static 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 212static 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 223static 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 235static 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 244static u8 sccnxp_port_read(struct uart_port *port, u8 reg) 245{ 246 return sccnxp_read(port, (port->line << 3) + reg); 247} 248 249static void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v) 250{ 251 sccnxp_write(port, (port->line << 3) + reg, v); 252} 253 254static 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 266static 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 303static 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 354static 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 362static 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 370static 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 384static void sccnxp_handle_rx(struct uart_port *port) 385{ 386 u8 sr, ch, flag; 387 388 for (;;) { 389 sr = sccnxp_port_read(port, SCCNXP_SR_REG); 390 if (!(sr & SR_RXRDY)) 391 break; 392 sr &= SR_PE | SR_FE | SR_OVR | SR_BRK; 393 394 ch = sccnxp_port_read(port, SCCNXP_RHR_REG); 395 396 port->icount.rx++; 397 flag = TTY_NORMAL; 398 399 if (unlikely(sr)) { 400 if (sr & SR_BRK) { 401 port->icount.brk++; 402 sccnxp_port_write(port, SCCNXP_CR_REG, 403 CR_CMD_BREAK_RESET); 404 if (uart_handle_break(port)) 405 continue; 406 } else if (sr & SR_PE) 407 port->icount.parity++; 408 else if (sr & SR_FE) 409 port->icount.frame++; 410 else if (sr & SR_OVR) { 411 port->icount.overrun++; 412 sccnxp_port_write(port, SCCNXP_CR_REG, 413 CR_CMD_STATUS_RESET); 414 } 415 416 sr &= port->read_status_mask; 417 if (sr & SR_BRK) 418 flag = TTY_BREAK; 419 else if (sr & SR_PE) 420 flag = TTY_PARITY; 421 else if (sr & SR_FE) 422 flag = TTY_FRAME; 423 else if (sr & SR_OVR) 424 flag = TTY_OVERRUN; 425 } 426 427 if (uart_handle_sysrq_char(port, ch)) 428 continue; 429 430 if (sr & port->ignore_status_mask) 431 continue; 432 433 uart_insert_char(port, sr, SR_OVR, ch, flag); 434 } 435 436 tty_flip_buffer_push(&port->state->port); 437} 438 439static void sccnxp_handle_tx(struct uart_port *port) 440{ 441 u8 sr; 442 struct circ_buf *xmit = &port->state->xmit; 443 struct sccnxp_port *s = dev_get_drvdata(port->dev); 444 445 if (unlikely(port->x_char)) { 446 sccnxp_port_write(port, SCCNXP_THR_REG, port->x_char); 447 port->icount.tx++; 448 port->x_char = 0; 449 return; 450 } 451 452 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { 453 /* Disable TX if FIFO is empty */ 454 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) { 455 sccnxp_disable_irq(port, IMR_TXRDY); 456 457 /* Set direction to input */ 458 if (s->chip->flags & SCCNXP_HAVE_IO) 459 sccnxp_set_bit(port, DIR_OP, 0); 460 } 461 return; 462 } 463 464 while (!uart_circ_empty(xmit)) { 465 sr = sccnxp_port_read(port, SCCNXP_SR_REG); 466 if (!(sr & SR_TXRDY)) 467 break; 468 469 sccnxp_port_write(port, SCCNXP_THR_REG, xmit->buf[xmit->tail]); 470 uart_xmit_advance(port, 1); 471 } 472 473 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 474 uart_write_wakeup(port); 475} 476 477static void sccnxp_handle_events(struct sccnxp_port *s) 478{ 479 int i; 480 u8 isr; 481 482 do { 483 isr = sccnxp_read(&s->port[0], SCCNXP_ISR_REG); 484 isr &= s->imr; 485 if (!isr) 486 break; 487 488 for (i = 0; i < s->uart.nr; i++) { 489 if (s->opened[i] && (isr & ISR_RXRDY(i))) 490 sccnxp_handle_rx(&s->port[i]); 491 if (s->opened[i] && (isr & ISR_TXRDY(i))) 492 sccnxp_handle_tx(&s->port[i]); 493 } 494 } while (1); 495} 496 497static void sccnxp_timer(struct timer_list *t) 498{ 499 struct sccnxp_port *s = from_timer(s, t, timer); 500 unsigned long flags; 501 502 spin_lock_irqsave(&s->lock, flags); 503 sccnxp_handle_events(s); 504 spin_unlock_irqrestore(&s->lock, flags); 505 506 mod_timer(&s->timer, jiffies + usecs_to_jiffies(s->pdata.poll_time_us)); 507} 508 509static irqreturn_t sccnxp_ist(int irq, void *dev_id) 510{ 511 struct sccnxp_port *s = (struct sccnxp_port *)dev_id; 512 unsigned long flags; 513 514 spin_lock_irqsave(&s->lock, flags); 515 sccnxp_handle_events(s); 516 spin_unlock_irqrestore(&s->lock, flags); 517 518 return IRQ_HANDLED; 519} 520 521static void sccnxp_start_tx(struct uart_port *port) 522{ 523 struct sccnxp_port *s = dev_get_drvdata(port->dev); 524 unsigned long flags; 525 526 spin_lock_irqsave(&s->lock, flags); 527 528 /* Set direction to output */ 529 if (s->chip->flags & SCCNXP_HAVE_IO) 530 sccnxp_set_bit(port, DIR_OP, 1); 531 532 sccnxp_enable_irq(port, IMR_TXRDY); 533 534 spin_unlock_irqrestore(&s->lock, flags); 535} 536 537static void sccnxp_stop_tx(struct uart_port *port) 538{ 539 /* Do nothing */ 540} 541 542static void sccnxp_stop_rx(struct uart_port *port) 543{ 544 struct sccnxp_port *s = dev_get_drvdata(port->dev); 545 unsigned long flags; 546 547 spin_lock_irqsave(&s->lock, flags); 548 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE); 549 spin_unlock_irqrestore(&s->lock, flags); 550} 551 552static unsigned int sccnxp_tx_empty(struct uart_port *port) 553{ 554 u8 val; 555 unsigned long flags; 556 struct sccnxp_port *s = dev_get_drvdata(port->dev); 557 558 spin_lock_irqsave(&s->lock, flags); 559 val = sccnxp_port_read(port, SCCNXP_SR_REG); 560 spin_unlock_irqrestore(&s->lock, flags); 561 562 return (val & SR_TXEMT) ? TIOCSER_TEMT : 0; 563} 564 565static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl) 566{ 567 struct sccnxp_port *s = dev_get_drvdata(port->dev); 568 unsigned long flags; 569 570 if (!(s->chip->flags & SCCNXP_HAVE_IO)) 571 return; 572 573 spin_lock_irqsave(&s->lock, flags); 574 575 sccnxp_set_bit(port, DTR_OP, mctrl & TIOCM_DTR); 576 sccnxp_set_bit(port, RTS_OP, mctrl & TIOCM_RTS); 577 578 spin_unlock_irqrestore(&s->lock, flags); 579} 580 581static unsigned int sccnxp_get_mctrl(struct uart_port *port) 582{ 583 u8 bitmask, ipr; 584 unsigned long flags; 585 struct sccnxp_port *s = dev_get_drvdata(port->dev); 586 unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR; 587 588 if (!(s->chip->flags & SCCNXP_HAVE_IO)) 589 return mctrl; 590 591 spin_lock_irqsave(&s->lock, flags); 592 593 ipr = ~sccnxp_read(port, SCCNXP_IPCR_REG); 594 595 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DSR_IP)) { 596 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 597 DSR_IP); 598 mctrl &= ~TIOCM_DSR; 599 mctrl |= (ipr & bitmask) ? TIOCM_DSR : 0; 600 } 601 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(CTS_IP)) { 602 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 603 CTS_IP); 604 mctrl &= ~TIOCM_CTS; 605 mctrl |= (ipr & bitmask) ? TIOCM_CTS : 0; 606 } 607 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DCD_IP)) { 608 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 609 DCD_IP); 610 mctrl &= ~TIOCM_CAR; 611 mctrl |= (ipr & bitmask) ? TIOCM_CAR : 0; 612 } 613 if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(RNG_IP)) { 614 bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line], 615 RNG_IP); 616 mctrl &= ~TIOCM_RNG; 617 mctrl |= (ipr & bitmask) ? TIOCM_RNG : 0; 618 } 619 620 spin_unlock_irqrestore(&s->lock, flags); 621 622 return mctrl; 623} 624 625static void sccnxp_break_ctl(struct uart_port *port, int break_state) 626{ 627 struct sccnxp_port *s = dev_get_drvdata(port->dev); 628 unsigned long flags; 629 630 spin_lock_irqsave(&s->lock, flags); 631 sccnxp_port_write(port, SCCNXP_CR_REG, break_state ? 632 CR_CMD_START_BREAK : CR_CMD_STOP_BREAK); 633 spin_unlock_irqrestore(&s->lock, flags); 634} 635 636static void sccnxp_set_termios(struct uart_port *port, 637 struct ktermios *termios, 638 const struct ktermios *old) 639{ 640 struct sccnxp_port *s = dev_get_drvdata(port->dev); 641 unsigned long flags; 642 u8 mr1, mr2; 643 int baud; 644 645 spin_lock_irqsave(&s->lock, flags); 646 647 /* Mask termios capabilities we don't support */ 648 termios->c_cflag &= ~CMSPAR; 649 650 /* Disable RX & TX, reset break condition, status and FIFOs */ 651 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET | 652 CR_RX_DISABLE | CR_TX_DISABLE); 653 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET); 654 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET); 655 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET); 656 657 /* Word size */ 658 switch (termios->c_cflag & CSIZE) { 659 case CS5: 660 mr1 = MR1_BITS_5; 661 break; 662 case CS6: 663 mr1 = MR1_BITS_6; 664 break; 665 case CS7: 666 mr1 = MR1_BITS_7; 667 break; 668 case CS8: 669 default: 670 mr1 = MR1_BITS_8; 671 break; 672 } 673 674 /* Parity */ 675 if (termios->c_cflag & PARENB) { 676 if (termios->c_cflag & PARODD) 677 mr1 |= MR1_PAR_ODD; 678 } else 679 mr1 |= MR1_PAR_NO; 680 681 /* Stop bits */ 682 mr2 = (termios->c_cflag & CSTOPB) ? MR2_STOP2 : MR2_STOP1; 683 684 /* Update desired format */ 685 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR1); 686 sccnxp_port_write(port, SCCNXP_MR_REG, mr1); 687 sccnxp_port_write(port, SCCNXP_MR_REG, mr2); 688 689 /* Set read status mask */ 690 port->read_status_mask = SR_OVR; 691 if (termios->c_iflag & INPCK) 692 port->read_status_mask |= SR_PE | SR_FE; 693 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) 694 port->read_status_mask |= SR_BRK; 695 696 /* Set status ignore mask */ 697 port->ignore_status_mask = 0; 698 if (termios->c_iflag & IGNBRK) 699 port->ignore_status_mask |= SR_BRK; 700 if (termios->c_iflag & IGNPAR) 701 port->ignore_status_mask |= SR_PE; 702 if (!(termios->c_cflag & CREAD)) 703 port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK; 704 705 /* Setup baudrate */ 706 baud = uart_get_baud_rate(port, termios, old, 50, 707 (s->chip->flags & SCCNXP_HAVE_MR0) ? 708 230400 : 38400); 709 baud = sccnxp_set_baud(port, baud); 710 711 /* Update timeout according to new baud rate */ 712 uart_update_timeout(port, termios->c_cflag, baud); 713 714 /* Report actual baudrate back to core */ 715 if (tty_termios_baud_rate(termios)) 716 tty_termios_encode_baud_rate(termios, baud, baud); 717 718 /* Enable RX & TX */ 719 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE); 720 721 spin_unlock_irqrestore(&s->lock, flags); 722} 723 724static int sccnxp_startup(struct uart_port *port) 725{ 726 struct sccnxp_port *s = dev_get_drvdata(port->dev); 727 unsigned long flags; 728 729 spin_lock_irqsave(&s->lock, flags); 730 731 if (s->chip->flags & SCCNXP_HAVE_IO) { 732 /* Outputs are controlled manually */ 733 sccnxp_write(port, SCCNXP_OPCR_REG, 0); 734 } 735 736 /* Reset break condition, status and FIFOs */ 737 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET); 738 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET); 739 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET); 740 sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET); 741 742 /* Enable RX & TX */ 743 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE); 744 745 /* Enable RX interrupt */ 746 sccnxp_enable_irq(port, IMR_RXRDY); 747 748 s->opened[port->line] = 1; 749 750 spin_unlock_irqrestore(&s->lock, flags); 751 752 return 0; 753} 754 755static void sccnxp_shutdown(struct uart_port *port) 756{ 757 struct sccnxp_port *s = dev_get_drvdata(port->dev); 758 unsigned long flags; 759 760 spin_lock_irqsave(&s->lock, flags); 761 762 s->opened[port->line] = 0; 763 764 /* Disable interrupts */ 765 sccnxp_disable_irq(port, IMR_TXRDY | IMR_RXRDY); 766 767 /* Disable TX & RX */ 768 sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE); 769 770 /* Leave direction to input */ 771 if (s->chip->flags & SCCNXP_HAVE_IO) 772 sccnxp_set_bit(port, DIR_OP, 0); 773 774 spin_unlock_irqrestore(&s->lock, flags); 775} 776 777static const char *sccnxp_type(struct uart_port *port) 778{ 779 struct sccnxp_port *s = dev_get_drvdata(port->dev); 780 781 return (port->type == PORT_SC26XX) ? s->chip->name : NULL; 782} 783 784static void sccnxp_release_port(struct uart_port *port) 785{ 786 /* Do nothing */ 787} 788 789static int sccnxp_request_port(struct uart_port *port) 790{ 791 /* Do nothing */ 792 return 0; 793} 794 795static void sccnxp_config_port(struct uart_port *port, int flags) 796{ 797 if (flags & UART_CONFIG_TYPE) 798 port->type = PORT_SC26XX; 799} 800 801static int sccnxp_verify_port(struct uart_port *port, struct serial_struct *s) 802{ 803 if ((s->type == PORT_UNKNOWN) || (s->type == PORT_SC26XX)) 804 return 0; 805 if (s->irq == port->irq) 806 return 0; 807 808 return -EINVAL; 809} 810 811static const struct uart_ops sccnxp_ops = { 812 .tx_empty = sccnxp_tx_empty, 813 .set_mctrl = sccnxp_set_mctrl, 814 .get_mctrl = sccnxp_get_mctrl, 815 .stop_tx = sccnxp_stop_tx, 816 .start_tx = sccnxp_start_tx, 817 .stop_rx = sccnxp_stop_rx, 818 .break_ctl = sccnxp_break_ctl, 819 .startup = sccnxp_startup, 820 .shutdown = sccnxp_shutdown, 821 .set_termios = sccnxp_set_termios, 822 .type = sccnxp_type, 823 .release_port = sccnxp_release_port, 824 .request_port = sccnxp_request_port, 825 .config_port = sccnxp_config_port, 826 .verify_port = sccnxp_verify_port, 827}; 828 829#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE 830static void sccnxp_console_putchar(struct uart_port *port, unsigned char c) 831{ 832 int tryes = 100000; 833 834 while (tryes--) { 835 if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXRDY) { 836 sccnxp_port_write(port, SCCNXP_THR_REG, c); 837 break; 838 } 839 barrier(); 840 } 841} 842 843static void sccnxp_console_write(struct console *co, const char *c, unsigned n) 844{ 845 struct sccnxp_port *s = (struct sccnxp_port *)co->data; 846 struct uart_port *port = &s->port[co->index]; 847 unsigned long flags; 848 849 spin_lock_irqsave(&s->lock, flags); 850 uart_console_write(port, c, n, sccnxp_console_putchar); 851 spin_unlock_irqrestore(&s->lock, flags); 852} 853 854static int sccnxp_console_setup(struct console *co, char *options) 855{ 856 struct sccnxp_port *s = (struct sccnxp_port *)co->data; 857 struct uart_port *port = &s->port[(co->index > 0) ? co->index : 0]; 858 int baud = 9600, bits = 8, parity = 'n', flow = 'n'; 859 860 if (options) 861 uart_parse_options(options, &baud, &parity, &bits, &flow); 862 863 return uart_set_options(port, co, baud, parity, bits, flow); 864} 865#endif 866 867static const struct platform_device_id sccnxp_id_table[] = { 868 { .name = "sc2681", .driver_data = (kernel_ulong_t)&sc2681, }, 869 { .name = "sc2691", .driver_data = (kernel_ulong_t)&sc2691, }, 870 { .name = "sc2692", .driver_data = (kernel_ulong_t)&sc2692, }, 871 { .name = "sc2891", .driver_data = (kernel_ulong_t)&sc2891, }, 872 { .name = "sc2892", .driver_data = (kernel_ulong_t)&sc2892, }, 873 { .name = "sc28202", .driver_data = (kernel_ulong_t)&sc28202, }, 874 { .name = "sc68681", .driver_data = (kernel_ulong_t)&sc68681, }, 875 { .name = "sc68692", .driver_data = (kernel_ulong_t)&sc68692, }, 876 { } 877}; 878MODULE_DEVICE_TABLE(platform, sccnxp_id_table); 879 880static int sccnxp_probe(struct platform_device *pdev) 881{ 882 struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev); 883 struct resource *res; 884 int i, ret, uartclk; 885 struct sccnxp_port *s; 886 void __iomem *membase; 887 struct clk *clk; 888 889 membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 890 if (IS_ERR(membase)) 891 return PTR_ERR(membase); 892 893 s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL); 894 if (!s) { 895 dev_err(&pdev->dev, "Error allocating port structure\n"); 896 return -ENOMEM; 897 } 898 platform_set_drvdata(pdev, s); 899 900 spin_lock_init(&s->lock); 901 902 s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data; 903 904 s->regulator = devm_regulator_get(&pdev->dev, "vcc"); 905 if (!IS_ERR(s->regulator)) { 906 ret = regulator_enable(s->regulator); 907 if (ret) { 908 dev_err(&pdev->dev, 909 "Failed to enable regulator: %i\n", ret); 910 return ret; 911 } 912 } else if (PTR_ERR(s->regulator) == -EPROBE_DEFER) 913 return -EPROBE_DEFER; 914 915 clk = devm_clk_get_enabled(&pdev->dev, NULL); 916 if (IS_ERR(clk)) { 917 ret = PTR_ERR(clk); 918 if (ret == -EPROBE_DEFER) 919 goto err_out; 920 uartclk = 0; 921 } else { 922 uartclk = clk_get_rate(clk); 923 } 924 925 if (!uartclk) { 926 dev_notice(&pdev->dev, "Using default clock frequency\n"); 927 uartclk = s->chip->freq_std; 928 } 929 930 /* Check input frequency */ 931 if ((uartclk < s->chip->freq_min) || (uartclk > s->chip->freq_max)) { 932 dev_err(&pdev->dev, "Frequency out of bounds\n"); 933 ret = -EINVAL; 934 goto err_out; 935 } 936 937 if (pdata) 938 memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata)); 939 940 if (s->pdata.poll_time_us) { 941 dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n", 942 s->pdata.poll_time_us); 943 s->poll = 1; 944 } 945 946 if (!s->poll) { 947 s->irq = platform_get_irq(pdev, 0); 948 if (s->irq < 0) { 949 ret = -ENXIO; 950 goto err_out; 951 } 952 } 953 954 s->uart.owner = THIS_MODULE; 955 s->uart.dev_name = "ttySC"; 956 s->uart.major = SCCNXP_MAJOR; 957 s->uart.minor = SCCNXP_MINOR; 958 s->uart.nr = s->chip->nr; 959#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE 960 s->uart.cons = &s->console; 961 s->uart.cons->device = uart_console_device; 962 s->uart.cons->write = sccnxp_console_write; 963 s->uart.cons->setup = sccnxp_console_setup; 964 s->uart.cons->flags = CON_PRINTBUFFER; 965 s->uart.cons->index = -1; 966 s->uart.cons->data = s; 967 strcpy(s->uart.cons->name, "ttySC"); 968#endif 969 ret = uart_register_driver(&s->uart); 970 if (ret) { 971 dev_err(&pdev->dev, "Registering UART driver failed\n"); 972 goto err_out; 973 } 974 975 for (i = 0; i < s->uart.nr; i++) { 976 s->port[i].line = i; 977 s->port[i].dev = &pdev->dev; 978 s->port[i].irq = s->irq; 979 s->port[i].type = PORT_SC26XX; 980 s->port[i].fifosize = s->chip->fifosize; 981 s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE; 982 s->port[i].iotype = UPIO_MEM; 983 s->port[i].mapbase = res->start; 984 s->port[i].membase = membase; 985 s->port[i].regshift = s->pdata.reg_shift; 986 s->port[i].uartclk = uartclk; 987 s->port[i].ops = &sccnxp_ops; 988 s->port[i].has_sysrq = IS_ENABLED(CONFIG_SERIAL_SCCNXP_CONSOLE); 989 uart_add_one_port(&s->uart, &s->port[i]); 990 /* Set direction to input */ 991 if (s->chip->flags & SCCNXP_HAVE_IO) 992 sccnxp_set_bit(&s->port[i], DIR_OP, 0); 993 } 994 995 /* Disable interrupts */ 996 s->imr = 0; 997 sccnxp_write(&s->port[0], SCCNXP_IMR_REG, 0); 998 999 if (!s->poll) { 1000 ret = devm_request_threaded_irq(&pdev->dev, s->irq, NULL, 1001 sccnxp_ist, 1002 IRQF_TRIGGER_FALLING | 1003 IRQF_ONESHOT, 1004 dev_name(&pdev->dev), s); 1005 if (!ret) 1006 return 0; 1007 1008 dev_err(&pdev->dev, "Unable to reguest IRQ %i\n", s->irq); 1009 } else { 1010 timer_setup(&s->timer, sccnxp_timer, 0); 1011 mod_timer(&s->timer, jiffies + 1012 usecs_to_jiffies(s->pdata.poll_time_us)); 1013 return 0; 1014 } 1015 1016 uart_unregister_driver(&s->uart); 1017err_out: 1018 if (!IS_ERR(s->regulator)) 1019 regulator_disable(s->regulator); 1020 1021 return ret; 1022} 1023 1024static void sccnxp_remove(struct platform_device *pdev) 1025{ 1026 int i; 1027 struct sccnxp_port *s = platform_get_drvdata(pdev); 1028 1029 if (!s->poll) 1030 devm_free_irq(&pdev->dev, s->irq, s); 1031 else 1032 del_timer_sync(&s->timer); 1033 1034 for (i = 0; i < s->uart.nr; i++) 1035 uart_remove_one_port(&s->uart, &s->port[i]); 1036 1037 uart_unregister_driver(&s->uart); 1038 1039 if (!IS_ERR(s->regulator)) { 1040 int ret = regulator_disable(s->regulator); 1041 if (ret) 1042 dev_err(&pdev->dev, "Failed to disable regulator\n"); 1043 } 1044} 1045 1046static struct platform_driver sccnxp_uart_driver = { 1047 .driver = { 1048 .name = SCCNXP_NAME, 1049 }, 1050 .probe = sccnxp_probe, 1051 .remove_new = sccnxp_remove, 1052 .id_table = sccnxp_id_table, 1053}; 1054module_platform_driver(sccnxp_uart_driver); 1055 1056MODULE_LICENSE("GPL v2"); 1057MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 1058MODULE_DESCRIPTION("SCCNXP serial driver"); 1059