1 /* 2 * High Speed Serial Ports on NXP LPC32xx SoC 3 * 4 * Authors: Kevin Wells <kevin.wells@nxp.com> 5 * Roland Stigge <stigge@antcom.de> 6 * 7 * Copyright (C) 2010 NXP Semiconductors 8 * Copyright (C) 2012 Roland Stigge 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 */ 20 21 #include <linux/module.h> 22 #include <linux/ioport.h> 23 #include <linux/init.h> 24 #include <linux/console.h> 25 #include <linux/sysrq.h> 26 #include <linux/tty.h> 27 #include <linux/tty_flip.h> 28 #include <linux/serial_core.h> 29 #include <linux/serial.h> 30 #include <linux/platform_device.h> 31 #include <linux/delay.h> 32 #include <linux/nmi.h> 33 #include <linux/io.h> 34 #include <linux/irq.h> 35 #include <linux/gpio.h> 36 #include <linux/of.h> 37 #include <mach/platform.h> 38 #include <mach/hardware.h> 39 40 /* 41 * High Speed UART register offsets 42 */ 43 #define LPC32XX_HSUART_FIFO(x) ((x) + 0x00) 44 #define LPC32XX_HSUART_LEVEL(x) ((x) + 0x04) 45 #define LPC32XX_HSUART_IIR(x) ((x) + 0x08) 46 #define LPC32XX_HSUART_CTRL(x) ((x) + 0x0C) 47 #define LPC32XX_HSUART_RATE(x) ((x) + 0x10) 48 49 #define LPC32XX_HSU_BREAK_DATA (1 << 10) 50 #define LPC32XX_HSU_ERROR_DATA (1 << 9) 51 #define LPC32XX_HSU_RX_EMPTY (1 << 8) 52 53 #define LPC32XX_HSU_TX_LEV(n) (((n) >> 8) & 0xFF) 54 #define LPC32XX_HSU_RX_LEV(n) ((n) & 0xFF) 55 56 #define LPC32XX_HSU_TX_INT_SET (1 << 6) 57 #define LPC32XX_HSU_RX_OE_INT (1 << 5) 58 #define LPC32XX_HSU_BRK_INT (1 << 4) 59 #define LPC32XX_HSU_FE_INT (1 << 3) 60 #define LPC32XX_HSU_RX_TIMEOUT_INT (1 << 2) 61 #define LPC32XX_HSU_RX_TRIG_INT (1 << 1) 62 #define LPC32XX_HSU_TX_INT (1 << 0) 63 64 #define LPC32XX_HSU_HRTS_INV (1 << 21) 65 #define LPC32XX_HSU_HRTS_TRIG_8B (0x0 << 19) 66 #define LPC32XX_HSU_HRTS_TRIG_16B (0x1 << 19) 67 #define LPC32XX_HSU_HRTS_TRIG_32B (0x2 << 19) 68 #define LPC32XX_HSU_HRTS_TRIG_48B (0x3 << 19) 69 #define LPC32XX_HSU_HRTS_EN (1 << 18) 70 #define LPC32XX_HSU_TMO_DISABLED (0x0 << 16) 71 #define LPC32XX_HSU_TMO_INACT_4B (0x1 << 16) 72 #define LPC32XX_HSU_TMO_INACT_8B (0x2 << 16) 73 #define LPC32XX_HSU_TMO_INACT_16B (0x3 << 16) 74 #define LPC32XX_HSU_HCTS_INV (1 << 15) 75 #define LPC32XX_HSU_HCTS_EN (1 << 14) 76 #define LPC32XX_HSU_OFFSET(n) ((n) << 9) 77 #define LPC32XX_HSU_BREAK (1 << 8) 78 #define LPC32XX_HSU_ERR_INT_EN (1 << 7) 79 #define LPC32XX_HSU_RX_INT_EN (1 << 6) 80 #define LPC32XX_HSU_TX_INT_EN (1 << 5) 81 #define LPC32XX_HSU_RX_TL1B (0x0 << 2) 82 #define LPC32XX_HSU_RX_TL4B (0x1 << 2) 83 #define LPC32XX_HSU_RX_TL8B (0x2 << 2) 84 #define LPC32XX_HSU_RX_TL16B (0x3 << 2) 85 #define LPC32XX_HSU_RX_TL32B (0x4 << 2) 86 #define LPC32XX_HSU_RX_TL48B (0x5 << 2) 87 #define LPC32XX_HSU_TX_TLEMPTY (0x0 << 0) 88 #define LPC32XX_HSU_TX_TL0B (0x0 << 0) 89 #define LPC32XX_HSU_TX_TL4B (0x1 << 0) 90 #define LPC32XX_HSU_TX_TL8B (0x2 << 0) 91 #define LPC32XX_HSU_TX_TL16B (0x3 << 0) 92 93 #define MODNAME "lpc32xx_hsuart" 94 95 struct lpc32xx_hsuart_port { 96 struct uart_port port; 97 }; 98 99 #define FIFO_READ_LIMIT 128 100 #define MAX_PORTS 3 101 #define LPC32XX_TTY_NAME "ttyTX" 102 static struct lpc32xx_hsuart_port lpc32xx_hs_ports[MAX_PORTS]; 103 104 #ifdef CONFIG_SERIAL_HS_LPC32XX_CONSOLE 105 static void wait_for_xmit_empty(struct uart_port *port) 106 { 107 unsigned int timeout = 10000; 108 109 do { 110 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL( 111 port->membase))) == 0) 112 break; 113 if (--timeout == 0) 114 break; 115 udelay(1); 116 } while (1); 117 } 118 119 static void wait_for_xmit_ready(struct uart_port *port) 120 { 121 unsigned int timeout = 10000; 122 123 while (1) { 124 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL( 125 port->membase))) < 32) 126 break; 127 if (--timeout == 0) 128 break; 129 udelay(1); 130 } 131 } 132 133 static void lpc32xx_hsuart_console_putchar(struct uart_port *port, int ch) 134 { 135 wait_for_xmit_ready(port); 136 writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase)); 137 } 138 139 static void lpc32xx_hsuart_console_write(struct console *co, const char *s, 140 unsigned int count) 141 { 142 struct lpc32xx_hsuart_port *up = &lpc32xx_hs_ports[co->index]; 143 unsigned long flags; 144 int locked = 1; 145 146 touch_nmi_watchdog(); 147 local_irq_save(flags); 148 if (up->port.sysrq) 149 locked = 0; 150 else if (oops_in_progress) 151 locked = spin_trylock(&up->port.lock); 152 else 153 spin_lock(&up->port.lock); 154 155 uart_console_write(&up->port, s, count, lpc32xx_hsuart_console_putchar); 156 wait_for_xmit_empty(&up->port); 157 158 if (locked) 159 spin_unlock(&up->port.lock); 160 local_irq_restore(flags); 161 } 162 163 static int __init lpc32xx_hsuart_console_setup(struct console *co, 164 char *options) 165 { 166 struct uart_port *port; 167 int baud = 115200; 168 int bits = 8; 169 int parity = 'n'; 170 int flow = 'n'; 171 172 if (co->index >= MAX_PORTS) 173 co->index = 0; 174 175 port = &lpc32xx_hs_ports[co->index].port; 176 if (!port->membase) 177 return -ENODEV; 178 179 if (options) 180 uart_parse_options(options, &baud, &parity, &bits, &flow); 181 182 return uart_set_options(port, co, baud, parity, bits, flow); 183 } 184 185 static struct uart_driver lpc32xx_hsuart_reg; 186 static struct console lpc32xx_hsuart_console = { 187 .name = LPC32XX_TTY_NAME, 188 .write = lpc32xx_hsuart_console_write, 189 .device = uart_console_device, 190 .setup = lpc32xx_hsuart_console_setup, 191 .flags = CON_PRINTBUFFER, 192 .index = -1, 193 .data = &lpc32xx_hsuart_reg, 194 }; 195 196 static int __init lpc32xx_hsuart_console_init(void) 197 { 198 register_console(&lpc32xx_hsuart_console); 199 return 0; 200 } 201 console_initcall(lpc32xx_hsuart_console_init); 202 203 #define LPC32XX_HSUART_CONSOLE (&lpc32xx_hsuart_console) 204 #else 205 #define LPC32XX_HSUART_CONSOLE NULL 206 #endif 207 208 static struct uart_driver lpc32xx_hs_reg = { 209 .owner = THIS_MODULE, 210 .driver_name = MODNAME, 211 .dev_name = LPC32XX_TTY_NAME, 212 .nr = MAX_PORTS, 213 .cons = LPC32XX_HSUART_CONSOLE, 214 }; 215 static int uarts_registered; 216 217 static unsigned int __serial_get_clock_div(unsigned long uartclk, 218 unsigned long rate) 219 { 220 u32 div, goodrate, hsu_rate, l_hsu_rate, comprate; 221 u32 rate_diff; 222 223 /* Find the closest divider to get the desired clock rate */ 224 div = uartclk / rate; 225 goodrate = hsu_rate = (div / 14) - 1; 226 if (hsu_rate != 0) 227 hsu_rate--; 228 229 /* Tweak divider */ 230 l_hsu_rate = hsu_rate + 3; 231 rate_diff = 0xFFFFFFFF; 232 233 while (hsu_rate < l_hsu_rate) { 234 comprate = uartclk / ((hsu_rate + 1) * 14); 235 if (abs(comprate - rate) < rate_diff) { 236 goodrate = hsu_rate; 237 rate_diff = abs(comprate - rate); 238 } 239 240 hsu_rate++; 241 } 242 if (hsu_rate > 0xFF) 243 hsu_rate = 0xFF; 244 245 return goodrate; 246 } 247 248 static void __serial_uart_flush(struct uart_port *port) 249 { 250 u32 tmp; 251 int cnt = 0; 252 253 while ((readl(LPC32XX_HSUART_LEVEL(port->membase)) > 0) && 254 (cnt++ < FIFO_READ_LIMIT)) 255 tmp = readl(LPC32XX_HSUART_FIFO(port->membase)); 256 } 257 258 static void __serial_lpc32xx_rx(struct uart_port *port) 259 { 260 struct tty_port *tport = &port->state->port; 261 unsigned int tmp, flag; 262 263 /* Read data from FIFO and push into terminal */ 264 tmp = readl(LPC32XX_HSUART_FIFO(port->membase)); 265 while (!(tmp & LPC32XX_HSU_RX_EMPTY)) { 266 flag = TTY_NORMAL; 267 port->icount.rx++; 268 269 if (tmp & LPC32XX_HSU_ERROR_DATA) { 270 /* Framing error */ 271 writel(LPC32XX_HSU_FE_INT, 272 LPC32XX_HSUART_IIR(port->membase)); 273 port->icount.frame++; 274 flag = TTY_FRAME; 275 tty_insert_flip_char(tport, 0, TTY_FRAME); 276 } 277 278 tty_insert_flip_char(tport, (tmp & 0xFF), flag); 279 280 tmp = readl(LPC32XX_HSUART_FIFO(port->membase)); 281 } 282 283 spin_unlock(&port->lock); 284 tty_flip_buffer_push(tport); 285 spin_lock(&port->lock); 286 } 287 288 static void __serial_lpc32xx_tx(struct uart_port *port) 289 { 290 struct circ_buf *xmit = &port->state->xmit; 291 unsigned int tmp; 292 293 if (port->x_char) { 294 writel((u32)port->x_char, LPC32XX_HSUART_FIFO(port->membase)); 295 port->icount.tx++; 296 port->x_char = 0; 297 return; 298 } 299 300 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) 301 goto exit_tx; 302 303 /* Transfer data */ 304 while (LPC32XX_HSU_TX_LEV(readl( 305 LPC32XX_HSUART_LEVEL(port->membase))) < 64) { 306 writel((u32) xmit->buf[xmit->tail], 307 LPC32XX_HSUART_FIFO(port->membase)); 308 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 309 port->icount.tx++; 310 if (uart_circ_empty(xmit)) 311 break; 312 } 313 314 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 315 uart_write_wakeup(port); 316 317 exit_tx: 318 if (uart_circ_empty(xmit)) { 319 tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); 320 tmp &= ~LPC32XX_HSU_TX_INT_EN; 321 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 322 } 323 } 324 325 static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id) 326 { 327 struct uart_port *port = dev_id; 328 struct tty_port *tport = &port->state->port; 329 u32 status; 330 331 spin_lock(&port->lock); 332 333 /* Read UART status and clear latched interrupts */ 334 status = readl(LPC32XX_HSUART_IIR(port->membase)); 335 336 if (status & LPC32XX_HSU_BRK_INT) { 337 /* Break received */ 338 writel(LPC32XX_HSU_BRK_INT, LPC32XX_HSUART_IIR(port->membase)); 339 port->icount.brk++; 340 uart_handle_break(port); 341 } 342 343 /* Framing error */ 344 if (status & LPC32XX_HSU_FE_INT) 345 writel(LPC32XX_HSU_FE_INT, LPC32XX_HSUART_IIR(port->membase)); 346 347 if (status & LPC32XX_HSU_RX_OE_INT) { 348 /* Receive FIFO overrun */ 349 writel(LPC32XX_HSU_RX_OE_INT, 350 LPC32XX_HSUART_IIR(port->membase)); 351 port->icount.overrun++; 352 tty_insert_flip_char(tport, 0, TTY_OVERRUN); 353 tty_schedule_flip(tport); 354 } 355 356 /* Data received? */ 357 if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT)) 358 __serial_lpc32xx_rx(port); 359 360 /* Transmit data request? */ 361 if ((status & LPC32XX_HSU_TX_INT) && (!uart_tx_stopped(port))) { 362 writel(LPC32XX_HSU_TX_INT, LPC32XX_HSUART_IIR(port->membase)); 363 __serial_lpc32xx_tx(port); 364 } 365 366 spin_unlock(&port->lock); 367 368 return IRQ_HANDLED; 369 } 370 371 /* port->lock is not held. */ 372 static unsigned int serial_lpc32xx_tx_empty(struct uart_port *port) 373 { 374 unsigned int ret = 0; 375 376 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(port->membase))) == 0) 377 ret = TIOCSER_TEMT; 378 379 return ret; 380 } 381 382 /* port->lock held by caller. */ 383 static void serial_lpc32xx_set_mctrl(struct uart_port *port, 384 unsigned int mctrl) 385 { 386 /* No signals are supported on HS UARTs */ 387 } 388 389 /* port->lock is held by caller and interrupts are disabled. */ 390 static unsigned int serial_lpc32xx_get_mctrl(struct uart_port *port) 391 { 392 /* No signals are supported on HS UARTs */ 393 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; 394 } 395 396 /* port->lock held by caller. */ 397 static void serial_lpc32xx_stop_tx(struct uart_port *port) 398 { 399 u32 tmp; 400 401 tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); 402 tmp &= ~LPC32XX_HSU_TX_INT_EN; 403 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 404 } 405 406 /* port->lock held by caller. */ 407 static void serial_lpc32xx_start_tx(struct uart_port *port) 408 { 409 u32 tmp; 410 411 __serial_lpc32xx_tx(port); 412 tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); 413 tmp |= LPC32XX_HSU_TX_INT_EN; 414 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 415 } 416 417 /* port->lock held by caller. */ 418 static void serial_lpc32xx_stop_rx(struct uart_port *port) 419 { 420 u32 tmp; 421 422 tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); 423 tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN); 424 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 425 426 writel((LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT | 427 LPC32XX_HSU_FE_INT), LPC32XX_HSUART_IIR(port->membase)); 428 } 429 430 /* port->lock is not held. */ 431 static void serial_lpc32xx_break_ctl(struct uart_port *port, 432 int break_state) 433 { 434 unsigned long flags; 435 u32 tmp; 436 437 spin_lock_irqsave(&port->lock, flags); 438 tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); 439 if (break_state != 0) 440 tmp |= LPC32XX_HSU_BREAK; 441 else 442 tmp &= ~LPC32XX_HSU_BREAK; 443 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 444 spin_unlock_irqrestore(&port->lock, flags); 445 } 446 447 /* LPC3250 Errata HSUART.1: Hang workaround via loopback mode on inactivity */ 448 static void lpc32xx_loopback_set(resource_size_t mapbase, int state) 449 { 450 int bit; 451 u32 tmp; 452 453 switch (mapbase) { 454 case LPC32XX_HS_UART1_BASE: 455 bit = 0; 456 break; 457 case LPC32XX_HS_UART2_BASE: 458 bit = 1; 459 break; 460 case LPC32XX_HS_UART7_BASE: 461 bit = 6; 462 break; 463 default: 464 WARN(1, "lpc32xx_hs: Warning: Unknown port at %08x\n", mapbase); 465 return; 466 } 467 468 tmp = readl(LPC32XX_UARTCTL_CLOOP); 469 if (state) 470 tmp |= (1 << bit); 471 else 472 tmp &= ~(1 << bit); 473 writel(tmp, LPC32XX_UARTCTL_CLOOP); 474 } 475 476 /* port->lock is not held. */ 477 static int serial_lpc32xx_startup(struct uart_port *port) 478 { 479 int retval; 480 unsigned long flags; 481 u32 tmp; 482 483 spin_lock_irqsave(&port->lock, flags); 484 485 __serial_uart_flush(port); 486 487 writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT | 488 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT), 489 LPC32XX_HSUART_IIR(port->membase)); 490 491 writel(0xFF, LPC32XX_HSUART_RATE(port->membase)); 492 493 /* 494 * Set receiver timeout, HSU offset of 20, no break, no interrupts, 495 * and default FIFO trigger levels 496 */ 497 tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B | 498 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B; 499 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 500 501 lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */ 502 503 spin_unlock_irqrestore(&port->lock, flags); 504 505 retval = request_irq(port->irq, serial_lpc32xx_interrupt, 506 0, MODNAME, port); 507 if (!retval) 508 writel((tmp | LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN), 509 LPC32XX_HSUART_CTRL(port->membase)); 510 511 return retval; 512 } 513 514 /* port->lock is not held. */ 515 static void serial_lpc32xx_shutdown(struct uart_port *port) 516 { 517 u32 tmp; 518 unsigned long flags; 519 520 spin_lock_irqsave(&port->lock, flags); 521 522 tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B | 523 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B; 524 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 525 526 lpc32xx_loopback_set(port->mapbase, 1); /* go to loopback mode */ 527 528 spin_unlock_irqrestore(&port->lock, flags); 529 530 free_irq(port->irq, port); 531 } 532 533 /* port->lock is not held. */ 534 static void serial_lpc32xx_set_termios(struct uart_port *port, 535 struct ktermios *termios, 536 struct ktermios *old) 537 { 538 unsigned long flags; 539 unsigned int baud, quot; 540 u32 tmp; 541 542 /* Always 8-bit, no parity, 1 stop bit */ 543 termios->c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD); 544 termios->c_cflag |= CS8; 545 546 termios->c_cflag &= ~(HUPCL | CMSPAR | CLOCAL | CRTSCTS); 547 548 baud = uart_get_baud_rate(port, termios, old, 0, 549 port->uartclk / 14); 550 551 quot = __serial_get_clock_div(port->uartclk, baud); 552 553 spin_lock_irqsave(&port->lock, flags); 554 555 /* Ignore characters? */ 556 tmp = readl(LPC32XX_HSUART_CTRL(port->membase)); 557 if ((termios->c_cflag & CREAD) == 0) 558 tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN); 559 else 560 tmp |= LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN; 561 writel(tmp, LPC32XX_HSUART_CTRL(port->membase)); 562 563 writel(quot, LPC32XX_HSUART_RATE(port->membase)); 564 565 uart_update_timeout(port, termios->c_cflag, baud); 566 567 spin_unlock_irqrestore(&port->lock, flags); 568 569 /* Don't rewrite B0 */ 570 if (tty_termios_baud_rate(termios)) 571 tty_termios_encode_baud_rate(termios, baud, baud); 572 } 573 574 static const char *serial_lpc32xx_type(struct uart_port *port) 575 { 576 return MODNAME; 577 } 578 579 static void serial_lpc32xx_release_port(struct uart_port *port) 580 { 581 if ((port->iotype == UPIO_MEM32) && (port->mapbase)) { 582 if (port->flags & UPF_IOREMAP) { 583 iounmap(port->membase); 584 port->membase = NULL; 585 } 586 587 release_mem_region(port->mapbase, SZ_4K); 588 } 589 } 590 591 static int serial_lpc32xx_request_port(struct uart_port *port) 592 { 593 int ret = -ENODEV; 594 595 if ((port->iotype == UPIO_MEM32) && (port->mapbase)) { 596 ret = 0; 597 598 if (!request_mem_region(port->mapbase, SZ_4K, MODNAME)) 599 ret = -EBUSY; 600 else if (port->flags & UPF_IOREMAP) { 601 port->membase = ioremap(port->mapbase, SZ_4K); 602 if (!port->membase) { 603 release_mem_region(port->mapbase, SZ_4K); 604 ret = -ENOMEM; 605 } 606 } 607 } 608 609 return ret; 610 } 611 612 static void serial_lpc32xx_config_port(struct uart_port *port, int uflags) 613 { 614 int ret; 615 616 ret = serial_lpc32xx_request_port(port); 617 if (ret < 0) 618 return; 619 port->type = PORT_UART00; 620 port->fifosize = 64; 621 622 __serial_uart_flush(port); 623 624 writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT | 625 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT), 626 LPC32XX_HSUART_IIR(port->membase)); 627 628 writel(0xFF, LPC32XX_HSUART_RATE(port->membase)); 629 630 /* Set receiver timeout, HSU offset of 20, no break, no interrupts, 631 and default FIFO trigger levels */ 632 writel(LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B | 633 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B, 634 LPC32XX_HSUART_CTRL(port->membase)); 635 } 636 637 static int serial_lpc32xx_verify_port(struct uart_port *port, 638 struct serial_struct *ser) 639 { 640 int ret = 0; 641 642 if (ser->type != PORT_UART00) 643 ret = -EINVAL; 644 645 return ret; 646 } 647 648 static const struct uart_ops serial_lpc32xx_pops = { 649 .tx_empty = serial_lpc32xx_tx_empty, 650 .set_mctrl = serial_lpc32xx_set_mctrl, 651 .get_mctrl = serial_lpc32xx_get_mctrl, 652 .stop_tx = serial_lpc32xx_stop_tx, 653 .start_tx = serial_lpc32xx_start_tx, 654 .stop_rx = serial_lpc32xx_stop_rx, 655 .break_ctl = serial_lpc32xx_break_ctl, 656 .startup = serial_lpc32xx_startup, 657 .shutdown = serial_lpc32xx_shutdown, 658 .set_termios = serial_lpc32xx_set_termios, 659 .type = serial_lpc32xx_type, 660 .release_port = serial_lpc32xx_release_port, 661 .request_port = serial_lpc32xx_request_port, 662 .config_port = serial_lpc32xx_config_port, 663 .verify_port = serial_lpc32xx_verify_port, 664 }; 665 666 /* 667 * Register a set of serial devices attached to a platform device 668 */ 669 static int serial_hs_lpc32xx_probe(struct platform_device *pdev) 670 { 671 struct lpc32xx_hsuart_port *p = &lpc32xx_hs_ports[uarts_registered]; 672 int ret = 0; 673 struct resource *res; 674 675 if (uarts_registered >= MAX_PORTS) { 676 dev_err(&pdev->dev, 677 "Error: Number of possible ports exceeded (%d)!\n", 678 uarts_registered + 1); 679 return -ENXIO; 680 } 681 682 memset(p, 0, sizeof(*p)); 683 684 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 685 if (!res) { 686 dev_err(&pdev->dev, 687 "Error getting mem resource for HS UART port %d\n", 688 uarts_registered); 689 return -ENXIO; 690 } 691 p->port.mapbase = res->start; 692 p->port.membase = NULL; 693 694 ret = platform_get_irq(pdev, 0); 695 if (ret < 0) { 696 dev_err(&pdev->dev, "Error getting irq for HS UART port %d\n", 697 uarts_registered); 698 return ret; 699 } 700 p->port.irq = ret; 701 702 p->port.iotype = UPIO_MEM32; 703 p->port.uartclk = LPC32XX_MAIN_OSC_FREQ; 704 p->port.regshift = 2; 705 p->port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP; 706 p->port.dev = &pdev->dev; 707 p->port.ops = &serial_lpc32xx_pops; 708 p->port.line = uarts_registered++; 709 spin_lock_init(&p->port.lock); 710 711 /* send port to loopback mode by default */ 712 lpc32xx_loopback_set(p->port.mapbase, 1); 713 714 ret = uart_add_one_port(&lpc32xx_hs_reg, &p->port); 715 716 platform_set_drvdata(pdev, p); 717 718 return ret; 719 } 720 721 /* 722 * Remove serial ports registered against a platform device. 723 */ 724 static int serial_hs_lpc32xx_remove(struct platform_device *pdev) 725 { 726 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev); 727 728 uart_remove_one_port(&lpc32xx_hs_reg, &p->port); 729 730 return 0; 731 } 732 733 734 #ifdef CONFIG_PM 735 static int serial_hs_lpc32xx_suspend(struct platform_device *pdev, 736 pm_message_t state) 737 { 738 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev); 739 740 uart_suspend_port(&lpc32xx_hs_reg, &p->port); 741 742 return 0; 743 } 744 745 static int serial_hs_lpc32xx_resume(struct platform_device *pdev) 746 { 747 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev); 748 749 uart_resume_port(&lpc32xx_hs_reg, &p->port); 750 751 return 0; 752 } 753 #else 754 #define serial_hs_lpc32xx_suspend NULL 755 #define serial_hs_lpc32xx_resume NULL 756 #endif 757 758 static const struct of_device_id serial_hs_lpc32xx_dt_ids[] = { 759 { .compatible = "nxp,lpc3220-hsuart" }, 760 { /* sentinel */ } 761 }; 762 763 MODULE_DEVICE_TABLE(of, serial_hs_lpc32xx_dt_ids); 764 765 static struct platform_driver serial_hs_lpc32xx_driver = { 766 .probe = serial_hs_lpc32xx_probe, 767 .remove = serial_hs_lpc32xx_remove, 768 .suspend = serial_hs_lpc32xx_suspend, 769 .resume = serial_hs_lpc32xx_resume, 770 .driver = { 771 .name = MODNAME, 772 .of_match_table = serial_hs_lpc32xx_dt_ids, 773 }, 774 }; 775 776 static int __init lpc32xx_hsuart_init(void) 777 { 778 int ret; 779 780 ret = uart_register_driver(&lpc32xx_hs_reg); 781 if (ret) 782 return ret; 783 784 ret = platform_driver_register(&serial_hs_lpc32xx_driver); 785 if (ret) 786 uart_unregister_driver(&lpc32xx_hs_reg); 787 788 return ret; 789 } 790 791 static void __exit lpc32xx_hsuart_exit(void) 792 { 793 platform_driver_unregister(&serial_hs_lpc32xx_driver); 794 uart_unregister_driver(&lpc32xx_hs_reg); 795 } 796 797 module_init(lpc32xx_hsuart_init); 798 module_exit(lpc32xx_hsuart_exit); 799 800 MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>"); 801 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); 802 MODULE_DESCRIPTION("NXP LPC32XX High Speed UART driver"); 803 MODULE_LICENSE("GPL"); 804