drivers/tty/serial/lpc32xx_hs.c

   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 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         p->port.irq = platform_get_irq(pdev, 0);
 695         if (p->port.irq < 0) {
 696                 dev_err(&pdev->dev, "Error getting irq for HS UART port %d\n",
 697                         uarts_registered);
 698                 return p->port.irq;
 699         }
 700
 701         p->port.iotype = UPIO_MEM32;
 702         p->port.uartclk = LPC32XX_MAIN_OSC_FREQ;
 703         p->port.regshift = 2;
 704         p->port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
 705         p->port.dev = &pdev->dev;
 706         p->port.ops = &serial_lpc32xx_pops;
 707         p->port.line = uarts_registered++;
 708         spin_lock_init(&p->port.lock);
 709
 710         /* send port to loopback mode by default */
 711         lpc32xx_loopback_set(p->port.mapbase, 1);
 712
 713         ret = uart_add_one_port(&lpc32xx_hs_reg, &p->port);
 714
 715         platform_set_drvdata(pdev, p);
 716
 717         return ret;
 718 }
 719
 720 /*
 721  * Remove serial ports registered against a platform device.
 722  */
 723 static int serial_hs_lpc32xx_remove(struct platform_device *pdev)
 724 {
 725         struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
 726
 727         uart_remove_one_port(&lpc32xx_hs_reg, &p->port);
 728
 729         return 0;
 730 }
 731
 732
 733 #ifdef CONFIG_PM
 734 static int serial_hs_lpc32xx_suspend(struct platform_device *pdev,
 735                                      pm_message_t state)
 736 {
 737         struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
 738
 739         uart_suspend_port(&lpc32xx_hs_reg, &p->port);
 740
 741         return 0;
 742 }
 743
 744 static int serial_hs_lpc32xx_resume(struct platform_device *pdev)
 745 {
 746         struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
 747
 748         uart_resume_port(&lpc32xx_hs_reg, &p->port);
 749
 750         return 0;
 751 }
 752 #else
 753 #define serial_hs_lpc32xx_suspend       NULL
 754 #define serial_hs_lpc32xx_resume        NULL
 755 #endif
 756
 757 static const struct of_device_id serial_hs_lpc32xx_dt_ids[] = {
 758         { .compatible = "nxp,lpc3220-hsuart" },
 759         { /* sentinel */ }
 760 };
 761
 762 MODULE_DEVICE_TABLE(of, serial_hs_lpc32xx_dt_ids);
 763
 764 static struct platform_driver serial_hs_lpc32xx_driver = {
 765         .probe          = serial_hs_lpc32xx_probe,
 766         .remove         = serial_hs_lpc32xx_remove,
 767         .suspend        = serial_hs_lpc32xx_suspend,
 768         .resume         = serial_hs_lpc32xx_resume,
 769         .driver         = {
 770                 .name   = MODNAME,
 771                 .of_match_table = serial_hs_lpc32xx_dt_ids,
 772         },
 773 };
 774
 775 static int __init lpc32xx_hsuart_init(void)
 776 {
 777         int ret;
 778
 779         ret = uart_register_driver(&lpc32xx_hs_reg);
 780         if (ret)
 781                 return ret;
 782
 783         ret = platform_driver_register(&serial_hs_lpc32xx_driver);
 784         if (ret)
 785                 uart_unregister_driver(&lpc32xx_hs_reg);
 786
 787         return ret;
 788 }
 789
 790 static void __exit lpc32xx_hsuart_exit(void)
 791 {
 792         platform_driver_unregister(&serial_hs_lpc32xx_driver);
 793         uart_unregister_driver(&lpc32xx_hs_reg);
 794 }
 795
 796 module_init(lpc32xx_hsuart_init);
 797 module_exit(lpc32xx_hsuart_exit);
 798
 799 MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
 800 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 801 MODULE_DESCRIPTION("NXP LPC32XX High Speed UART driver");
 802 MODULE_LICENSE("GPL");