drivers/tty/serial/lpc32xx_hs.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * High Speed Serial Ports on NXP LPC32xx SoC
   4  *
   5  * Authors: Kevin Wells <[email protected]>
   6  *          Roland Stigge <[email protected]>
   7  *
   8  * Copyright (C) 2010 NXP Semiconductors
   9  * Copyright (C) 2012 Roland Stigge
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/ioport.h>
  14 #include <linux/init.h>
  15 #include <linux/console.h>
  16 #include <linux/sysrq.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_flip.h>
  19 #include <linux/serial_core.h>
  20 #include <linux/serial.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/delay.h>
  23 #include <linux/nmi.h>
  24 #include <linux/io.h>
  25 #include <linux/irq.h>
  26 #include <linux/of.h>
  27 #include <linux/sizes.h>
  28 #include <linux/soc/nxp/lpc32xx-misc.h>
  29
  30 /*
  31  * High Speed UART register offsets
  32  */
  33 #define LPC32XX_HSUART_FIFO(x)                  ((x) + 0x00)
  34 #define LPC32XX_HSUART_LEVEL(x)                 ((x) + 0x04)
  35 #define LPC32XX_HSUART_IIR(x)                   ((x) + 0x08)
  36 #define LPC32XX_HSUART_CTRL(x)                  ((x) + 0x0C)
  37 #define LPC32XX_HSUART_RATE(x)                  ((x) + 0x10)
  38
  39 #define LPC32XX_HSU_BREAK_DATA                  (1 << 10)
  40 #define LPC32XX_HSU_ERROR_DATA                  (1 << 9)
  41 #define LPC32XX_HSU_RX_EMPTY                    (1 << 8)
  42
  43 #define LPC32XX_HSU_TX_LEV(n)                   (((n) >> 8) & 0xFF)
  44 #define LPC32XX_HSU_RX_LEV(n)                   ((n) & 0xFF)
  45
  46 #define LPC32XX_HSU_TX_INT_SET                  (1 << 6)
  47 #define LPC32XX_HSU_RX_OE_INT                   (1 << 5)
  48 #define LPC32XX_HSU_BRK_INT                     (1 << 4)
  49 #define LPC32XX_HSU_FE_INT                      (1 << 3)
  50 #define LPC32XX_HSU_RX_TIMEOUT_INT              (1 << 2)
  51 #define LPC32XX_HSU_RX_TRIG_INT                 (1 << 1)
  52 #define LPC32XX_HSU_TX_INT                      (1 << 0)
  53
  54 #define LPC32XX_HSU_HRTS_INV                    (1 << 21)
  55 #define LPC32XX_HSU_HRTS_TRIG_8B                (0x0 << 19)
  56 #define LPC32XX_HSU_HRTS_TRIG_16B               (0x1 << 19)
  57 #define LPC32XX_HSU_HRTS_TRIG_32B               (0x2 << 19)
  58 #define LPC32XX_HSU_HRTS_TRIG_48B               (0x3 << 19)
  59 #define LPC32XX_HSU_HRTS_EN                     (1 << 18)
  60 #define LPC32XX_HSU_TMO_DISABLED                (0x0 << 16)
  61 #define LPC32XX_HSU_TMO_INACT_4B                (0x1 << 16)
  62 #define LPC32XX_HSU_TMO_INACT_8B                (0x2 << 16)
  63 #define LPC32XX_HSU_TMO_INACT_16B               (0x3 << 16)
  64 #define LPC32XX_HSU_HCTS_INV                    (1 << 15)
  65 #define LPC32XX_HSU_HCTS_EN                     (1 << 14)
  66 #define LPC32XX_HSU_OFFSET(n)                   ((n) << 9)
  67 #define LPC32XX_HSU_BREAK                       (1 << 8)
  68 #define LPC32XX_HSU_ERR_INT_EN                  (1 << 7)
  69 #define LPC32XX_HSU_RX_INT_EN                   (1 << 6)
  70 #define LPC32XX_HSU_TX_INT_EN                   (1 << 5)
  71 #define LPC32XX_HSU_RX_TL1B                     (0x0 << 2)
  72 #define LPC32XX_HSU_RX_TL4B                     (0x1 << 2)
  73 #define LPC32XX_HSU_RX_TL8B                     (0x2 << 2)
  74 #define LPC32XX_HSU_RX_TL16B                    (0x3 << 2)
  75 #define LPC32XX_HSU_RX_TL32B                    (0x4 << 2)
  76 #define LPC32XX_HSU_RX_TL48B                    (0x5 << 2)
  77 #define LPC32XX_HSU_TX_TLEMPTY                  (0x0 << 0)
  78 #define LPC32XX_HSU_TX_TL0B                     (0x0 << 0)
  79 #define LPC32XX_HSU_TX_TL4B                     (0x1 << 0)
  80 #define LPC32XX_HSU_TX_TL8B                     (0x2 << 0)
  81 #define LPC32XX_HSU_TX_TL16B                    (0x3 << 0)
  82
  83 #define LPC32XX_MAIN_OSC_FREQ                   13000000
  84
  85 #define MODNAME "lpc32xx_hsuart"
  86
  87 struct lpc32xx_hsuart_port {
  88         struct uart_port port;
  89 };
  90
  91 #define FIFO_READ_LIMIT 128
  92 #define MAX_PORTS 3
  93 #define LPC32XX_TTY_NAME "ttyTX"
  94 static struct lpc32xx_hsuart_port lpc32xx_hs_ports[MAX_PORTS];
  95
  96 #ifdef CONFIG_SERIAL_HS_LPC32XX_CONSOLE
  97 static void wait_for_xmit_empty(struct uart_port *port)
  98 {
  99         unsigned int timeout = 10000;
 100
 101         do {
 102                 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
 103                                                         port->membase))) == 0)
 104                         break;
 105                 if (--timeout == 0)
 106                         break;
 107                 udelay(1);
 108         } while (1);
 109 }
 110
 111 static void wait_for_xmit_ready(struct uart_port *port)
 112 {
 113         unsigned int timeout = 10000;
 114
 115         while (1) {
 116                 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
 117                                                         port->membase))) < 32)
 118                         break;
 119                 if (--timeout == 0)
 120                         break;
 121                 udelay(1);
 122         }
 123 }
 124
 125 static void lpc32xx_hsuart_console_putchar(struct uart_port *port, unsigned char ch)
 126 {
 127         wait_for_xmit_ready(port);
 128         writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase));
 129 }
 130
 131 static void lpc32xx_hsuart_console_write(struct console *co, const char *s,
 132                                          unsigned int count)
 133 {
 134         struct lpc32xx_hsuart_port *up = &lpc32xx_hs_ports[co->index];
 135         unsigned long flags;
 136         int locked = 1;
 137
 138         touch_nmi_watchdog();
 139         if (oops_in_progress)
 140                 locked = uart_port_trylock_irqsave(&up->port, &flags);
 141         else
 142                 uart_port_lock_irqsave(&up->port, &flags);
 143
 144         uart_console_write(&up->port, s, count, lpc32xx_hsuart_console_putchar);
 145         wait_for_xmit_empty(&up->port);
 146
 147         if (locked)
 148                 uart_port_unlock_irqrestore(&up->port, flags);
 149 }
 150
 151 static int __init lpc32xx_hsuart_console_setup(struct console *co,
 152                                                char *options)
 153 {
 154         struct uart_port *port;
 155         int baud = 115200;
 156         int bits = 8;
 157         int parity = 'n';
 158         int flow = 'n';
 159
 160         if (co->index >= MAX_PORTS)
 161                 co->index = 0;
 162
 163         port = &lpc32xx_hs_ports[co->index].port;
 164         if (!port->membase)
 165                 return -ENODEV;
 166
 167         if (options)
 168                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 169
 170         lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
 171
 172         return uart_set_options(port, co, baud, parity, bits, flow);
 173 }
 174
 175 static struct uart_driver lpc32xx_hsuart_reg;
 176 static struct console lpc32xx_hsuart_console = {
 177         .name           = LPC32XX_TTY_NAME,
 178         .write          = lpc32xx_hsuart_console_write,
 179         .device         = uart_console_device,
 180         .setup          = lpc32xx_hsuart_console_setup,
 181         .flags          = CON_PRINTBUFFER,
 182         .index          = -1,
 183         .data           = &lpc32xx_hsuart_reg,
 184 };
 185
 186 static int __init lpc32xx_hsuart_console_init(void)
 187 {
 188         register_console(&lpc32xx_hsuart_console);
 189         return 0;
 190 }
 191 console_initcall(lpc32xx_hsuart_console_init);
 192
 193 #define LPC32XX_HSUART_CONSOLE (&lpc32xx_hsuart_console)
 194 #else
 195 #define LPC32XX_HSUART_CONSOLE NULL
 196 #endif
 197
 198 static struct uart_driver lpc32xx_hs_reg = {
 199         .owner          = THIS_MODULE,
 200         .driver_name    = MODNAME,
 201         .dev_name       = LPC32XX_TTY_NAME,
 202         .nr             = MAX_PORTS,
 203         .cons           = LPC32XX_HSUART_CONSOLE,
 204 };
 205 static int uarts_registered;
 206
 207 static unsigned int __serial_get_clock_div(unsigned long uartclk,
 208                                            unsigned long rate)
 209 {
 210         u32 div, goodrate, hsu_rate, l_hsu_rate, comprate;
 211         u32 rate_diff;
 212
 213         /* Find the closest divider to get the desired clock rate */
 214         div = uartclk / rate;
 215         goodrate = hsu_rate = (div / 14) - 1;
 216         if (hsu_rate != 0)
 217                 hsu_rate--;
 218
 219         /* Tweak divider */
 220         l_hsu_rate = hsu_rate + 3;
 221         rate_diff = 0xFFFFFFFF;
 222
 223         while (hsu_rate < l_hsu_rate) {
 224                 comprate = uartclk / ((hsu_rate + 1) * 14);
 225                 if (abs(comprate - rate) < rate_diff) {
 226                         goodrate = hsu_rate;
 227                         rate_diff = abs(comprate - rate);
 228                 }
 229
 230                 hsu_rate++;
 231         }
 232
 233         return goodrate;
 234 }
 235
 236 static void __serial_uart_flush(struct uart_port *port)
 237 {
 238         int cnt = 0;
 239
 240         while ((readl(LPC32XX_HSUART_LEVEL(port->membase)) > 0) &&
 241                (cnt++ < FIFO_READ_LIMIT))
 242                 readl(LPC32XX_HSUART_FIFO(port->membase));
 243 }
 244
 245 static void __serial_lpc32xx_rx(struct uart_port *port)
 246 {
 247         struct tty_port *tport = &port->state->port;
 248         unsigned int tmp, flag;
 249
 250         /* Read data from FIFO and push into terminal */
 251         tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
 252         while (!(tmp & LPC32XX_HSU_RX_EMPTY)) {
 253                 flag = TTY_NORMAL;
 254                 port->icount.rx++;
 255
 256                 if (tmp & LPC32XX_HSU_ERROR_DATA) {
 257                         /* Framing error */
 258                         writel(LPC32XX_HSU_FE_INT,
 259                                LPC32XX_HSUART_IIR(port->membase));
 260                         port->icount.frame++;
 261                         flag = TTY_FRAME;
 262                         tty_insert_flip_char(tport, 0, TTY_FRAME);
 263                 }
 264
 265                 if (!uart_prepare_sysrq_char(port, tmp & 0xff))
 266                         tty_insert_flip_char(tport, (tmp & 0xFF), flag);
 267
 268                 tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
 269         }
 270
 271         tty_flip_buffer_push(tport);
 272 }
 273
 274 static bool serial_lpc32xx_tx_ready(struct uart_port *port)
 275 {
 276         u32 level = readl(LPC32XX_HSUART_LEVEL(port->membase));
 277
 278         return LPC32XX_HSU_TX_LEV(level) < 64;
 279 }
 280
 281 static void __serial_lpc32xx_tx(struct uart_port *port)
 282 {
 283         u8 ch;
 284
 285         uart_port_tx(port, ch,
 286                 serial_lpc32xx_tx_ready(port),
 287                 writel(ch, LPC32XX_HSUART_FIFO(port->membase)));
 288 }
 289
 290 static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
 291 {
 292         struct uart_port *port = dev_id;
 293         struct tty_port *tport = &port->state->port;
 294         u32 status;
 295
 296         uart_port_lock(port);
 297
 298         /* Read UART status and clear latched interrupts */
 299         status = readl(LPC32XX_HSUART_IIR(port->membase));
 300
 301         if (status & LPC32XX_HSU_BRK_INT) {
 302                 /* Break received */
 303                 writel(LPC32XX_HSU_BRK_INT, LPC32XX_HSUART_IIR(port->membase));
 304                 port->icount.brk++;
 305                 uart_handle_break(port);
 306         }
 307
 308         /* Framing error */
 309         if (status & LPC32XX_HSU_FE_INT)
 310                 writel(LPC32XX_HSU_FE_INT, LPC32XX_HSUART_IIR(port->membase));
 311
 312         if (status & LPC32XX_HSU_RX_OE_INT) {
 313                 /* Receive FIFO overrun */
 314                 writel(LPC32XX_HSU_RX_OE_INT,
 315                        LPC32XX_HSUART_IIR(port->membase));
 316                 port->icount.overrun++;
 317                 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
 318                 tty_flip_buffer_push(tport);
 319         }
 320
 321         /* Data received? */
 322         if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT))
 323                 __serial_lpc32xx_rx(port);
 324
 325         /* Transmit data request? */
 326         if ((status & LPC32XX_HSU_TX_INT) && (!uart_tx_stopped(port))) {
 327                 writel(LPC32XX_HSU_TX_INT, LPC32XX_HSUART_IIR(port->membase));
 328                 __serial_lpc32xx_tx(port);
 329         }
 330
 331         uart_unlock_and_check_sysrq(port);
 332
 333         return IRQ_HANDLED;
 334 }
 335
 336 /* port->lock is not held.  */
 337 static unsigned int serial_lpc32xx_tx_empty(struct uart_port *port)
 338 {
 339         unsigned int ret = 0;
 340
 341         if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(port->membase))) == 0)
 342                 ret = TIOCSER_TEMT;
 343
 344         return ret;
 345 }
 346
 347 /* port->lock held by caller.  */
 348 static void serial_lpc32xx_set_mctrl(struct uart_port *port,
 349                                      unsigned int mctrl)
 350 {
 351         /* No signals are supported on HS UARTs */
 352 }
 353
 354 /* port->lock is held by caller and interrupts are disabled.  */
 355 static unsigned int serial_lpc32xx_get_mctrl(struct uart_port *port)
 356 {
 357         /* No signals are supported on HS UARTs */
 358         return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 359 }
 360
 361 /* port->lock held by caller.  */
 362 static void serial_lpc32xx_stop_tx(struct uart_port *port)
 363 {
 364         u32 tmp;
 365
 366         tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
 367         tmp &= ~LPC32XX_HSU_TX_INT_EN;
 368         writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
 369 }
 370
 371 /* port->lock held by caller.  */
 372 static void serial_lpc32xx_start_tx(struct uart_port *port)
 373 {
 374         u32 tmp;
 375
 376         __serial_lpc32xx_tx(port);
 377         tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
 378         tmp |= LPC32XX_HSU_TX_INT_EN;
 379         writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
 380 }
 381
 382 /* port->lock held by caller.  */
 383 static void serial_lpc32xx_stop_rx(struct uart_port *port)
 384 {
 385         u32 tmp;
 386
 387         tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
 388         tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
 389         writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
 390
 391         writel((LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT |
 392                 LPC32XX_HSU_FE_INT), LPC32XX_HSUART_IIR(port->membase));
 393 }
 394
 395 /* port->lock is not held.  */
 396 static void serial_lpc32xx_break_ctl(struct uart_port *port,
 397                                      int break_state)
 398 {
 399         unsigned long flags;
 400         u32 tmp;
 401
 402         uart_port_lock_irqsave(port, &flags);
 403         tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
 404         if (break_state != 0)
 405                 tmp |= LPC32XX_HSU_BREAK;
 406         else
 407                 tmp &= ~LPC32XX_HSU_BREAK;
 408         writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
 409         uart_port_unlock_irqrestore(port, flags);
 410 }
 411
 412 /* port->lock is not held.  */
 413 static int serial_lpc32xx_startup(struct uart_port *port)
 414 {
 415         int retval;
 416         unsigned long flags;
 417         u32 tmp;
 418
 419         uart_port_lock_irqsave(port, &flags);
 420
 421         __serial_uart_flush(port);
 422
 423         writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
 424                 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
 425                LPC32XX_HSUART_IIR(port->membase));
 426
 427         writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
 428
 429         /*
 430          * Set receiver timeout, HSU offset of 20, no break, no interrupts,
 431          * and default FIFO trigger levels
 432          */
 433         tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
 434                 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
 435         writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
 436
 437         lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
 438
 439         uart_port_unlock_irqrestore(port, flags);
 440
 441         retval = request_irq(port->irq, serial_lpc32xx_interrupt,
 442                              0, MODNAME, port);
 443         if (!retval)
 444                 writel((tmp | LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN),
 445                        LPC32XX_HSUART_CTRL(port->membase));
 446
 447         return retval;
 448 }
 449
 450 /* port->lock is not held.  */
 451 static void serial_lpc32xx_shutdown(struct uart_port *port)
 452 {
 453         u32 tmp;
 454         unsigned long flags;
 455
 456         uart_port_lock_irqsave(port, &flags);
 457
 458         tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
 459                 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
 460         writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
 461
 462         lpc32xx_loopback_set(port->mapbase, 1); /* go to loopback mode */
 463
 464         uart_port_unlock_irqrestore(port, flags);
 465
 466         free_irq(port->irq, port);
 467 }
 468
 469 /* port->lock is not held.  */
 470 static void serial_lpc32xx_set_termios(struct uart_port *port,
 471                                        struct ktermios *termios,
 472                                        const struct ktermios *old)
 473 {
 474         unsigned long flags;
 475         unsigned int baud, quot;
 476         u32 tmp;
 477
 478         /* Always 8-bit, no parity, 1 stop bit */
 479         termios->c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD);
 480         termios->c_cflag |= CS8;
 481
 482         termios->c_cflag &= ~(HUPCL | CMSPAR | CLOCAL | CRTSCTS);
 483
 484         baud = uart_get_baud_rate(port, termios, old, 0,
 485                                   port->uartclk / 14);
 486
 487         quot = __serial_get_clock_div(port->uartclk, baud);
 488
 489         uart_port_lock_irqsave(port, &flags);
 490
 491         /* Ignore characters? */
 492         tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
 493         if ((termios->c_cflag & CREAD) == 0)
 494                 tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
 495         else
 496                 tmp |= LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN;
 497         writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
 498
 499         writel(quot, LPC32XX_HSUART_RATE(port->membase));
 500
 501         uart_update_timeout(port, termios->c_cflag, baud);
 502
 503         uart_port_unlock_irqrestore(port, flags);
 504
 505         /* Don't rewrite B0 */
 506         if (tty_termios_baud_rate(termios))
 507                 tty_termios_encode_baud_rate(termios, baud, baud);
 508 }
 509
 510 static const char *serial_lpc32xx_type(struct uart_port *port)
 511 {
 512         return MODNAME;
 513 }
 514
 515 static void serial_lpc32xx_release_port(struct uart_port *port)
 516 {
 517         if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
 518                 if (port->flags & UPF_IOREMAP) {
 519                         iounmap(port->membase);
 520                         port->membase = NULL;
 521                 }
 522
 523                 release_mem_region(port->mapbase, SZ_4K);
 524         }
 525 }
 526
 527 static int serial_lpc32xx_request_port(struct uart_port *port)
 528 {
 529         int ret = -ENODEV;
 530
 531         if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
 532                 ret = 0;
 533
 534                 if (!request_mem_region(port->mapbase, SZ_4K, MODNAME))
 535                         ret = -EBUSY;
 536                 else if (port->flags & UPF_IOREMAP) {
 537                         port->membase = ioremap(port->mapbase, SZ_4K);
 538                         if (!port->membase) {
 539                                 release_mem_region(port->mapbase, SZ_4K);
 540                                 ret = -ENOMEM;
 541                         }
 542                 }
 543         }
 544
 545         return ret;
 546 }
 547
 548 static void serial_lpc32xx_config_port(struct uart_port *port, int uflags)
 549 {
 550         int ret;
 551
 552         ret = serial_lpc32xx_request_port(port);
 553         if (ret < 0)
 554                 return;
 555         port->type = PORT_UART00;
 556         port->fifosize = 64;
 557
 558         __serial_uart_flush(port);
 559
 560         writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
 561                 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
 562                LPC32XX_HSUART_IIR(port->membase));
 563
 564         writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
 565
 566         /* Set receiver timeout, HSU offset of 20, no break, no interrupts,
 567            and default FIFO trigger levels */
 568         writel(LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
 569                LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B,
 570                LPC32XX_HSUART_CTRL(port->membase));
 571 }
 572
 573 static int serial_lpc32xx_verify_port(struct uart_port *port,
 574                                       struct serial_struct *ser)
 575 {
 576         int ret = 0;
 577
 578         if (ser->type != PORT_UART00)
 579                 ret = -EINVAL;
 580
 581         return ret;
 582 }
 583
 584 static const struct uart_ops serial_lpc32xx_pops = {
 585         .tx_empty       = serial_lpc32xx_tx_empty,
 586         .set_mctrl      = serial_lpc32xx_set_mctrl,
 587         .get_mctrl      = serial_lpc32xx_get_mctrl,
 588         .stop_tx        = serial_lpc32xx_stop_tx,
 589         .start_tx       = serial_lpc32xx_start_tx,
 590         .stop_rx        = serial_lpc32xx_stop_rx,
 591         .break_ctl      = serial_lpc32xx_break_ctl,
 592         .startup        = serial_lpc32xx_startup,
 593         .shutdown       = serial_lpc32xx_shutdown,
 594         .set_termios    = serial_lpc32xx_set_termios,
 595         .type           = serial_lpc32xx_type,
 596         .release_port   = serial_lpc32xx_release_port,
 597         .request_port   = serial_lpc32xx_request_port,
 598         .config_port    = serial_lpc32xx_config_port,
 599         .verify_port    = serial_lpc32xx_verify_port,
 600 };
 601
 602 /*
 603  * Register a set of serial devices attached to a platform device
 604  */
 605 static int serial_hs_lpc32xx_probe(struct platform_device *pdev)
 606 {
 607         struct lpc32xx_hsuart_port *p = &lpc32xx_hs_ports[uarts_registered];
 608         int ret = 0;
 609         struct resource *res;
 610
 611         if (uarts_registered >= MAX_PORTS) {
 612                 dev_err(&pdev->dev,
 613                         "Error: Number of possible ports exceeded (%d)!\n",
 614                         uarts_registered + 1);
 615                 return -ENXIO;
 616         }
 617
 618         memset(p, 0, sizeof(*p));
 619
 620         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 621         if (!res) {
 622                 dev_err(&pdev->dev,
 623                         "Error getting mem resource for HS UART port %d\n",
 624                         uarts_registered);
 625                 return -ENXIO;
 626         }
 627         p->port.mapbase = res->start;
 628         p->port.membase = NULL;
 629
 630         ret = platform_get_irq(pdev, 0);
 631         if (ret < 0)
 632                 return ret;
 633         p->port.irq = ret;
 634
 635         p->port.iotype = UPIO_MEM32;
 636         p->port.uartclk = LPC32XX_MAIN_OSC_FREQ;
 637         p->port.regshift = 2;
 638         p->port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
 639         p->port.dev = &pdev->dev;
 640         p->port.ops = &serial_lpc32xx_pops;
 641         p->port.line = uarts_registered++;
 642         spin_lock_init(&p->port.lock);
 643
 644         /* send port to loopback mode by default */
 645         lpc32xx_loopback_set(p->port.mapbase, 1);
 646
 647         ret = uart_add_one_port(&lpc32xx_hs_reg, &p->port);
 648
 649         platform_set_drvdata(pdev, p);
 650
 651         return ret;
 652 }
 653
 654 /*
 655  * Remove serial ports registered against a platform device.
 656  */
 657 static void serial_hs_lpc32xx_remove(struct platform_device *pdev)
 658 {
 659         struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
 660
 661         uart_remove_one_port(&lpc32xx_hs_reg, &p->port);
 662 }
 663
 664
 665 #ifdef CONFIG_PM
 666 static int serial_hs_lpc32xx_suspend(struct platform_device *pdev,
 667                                      pm_message_t state)
 668 {
 669         struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
 670
 671         uart_suspend_port(&lpc32xx_hs_reg, &p->port);
 672
 673         return 0;
 674 }
 675
 676 static int serial_hs_lpc32xx_resume(struct platform_device *pdev)
 677 {
 678         struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
 679
 680         uart_resume_port(&lpc32xx_hs_reg, &p->port);
 681
 682         return 0;
 683 }
 684 #else
 685 #define serial_hs_lpc32xx_suspend       NULL
 686 #define serial_hs_lpc32xx_resume        NULL
 687 #endif
 688
 689 static const struct of_device_id serial_hs_lpc32xx_dt_ids[] = {
 690         { .compatible = "nxp,lpc3220-hsuart" },
 691         { /* sentinel */ }
 692 };
 693
 694 MODULE_DEVICE_TABLE(of, serial_hs_lpc32xx_dt_ids);
 695
 696 static struct platform_driver serial_hs_lpc32xx_driver = {
 697         .probe          = serial_hs_lpc32xx_probe,
 698         .remove         = serial_hs_lpc32xx_remove,
 699         .suspend        = serial_hs_lpc32xx_suspend,
 700         .resume         = serial_hs_lpc32xx_resume,
 701         .driver         = {
 702                 .name   = MODNAME,
 703                 .of_match_table = serial_hs_lpc32xx_dt_ids,
 704         },
 705 };
 706
 707 static int __init lpc32xx_hsuart_init(void)
 708 {
 709         int ret;
 710
 711         ret = uart_register_driver(&lpc32xx_hs_reg);
 712         if (ret)
 713                 return ret;
 714
 715         ret = platform_driver_register(&serial_hs_lpc32xx_driver);
 716         if (ret)
 717                 uart_unregister_driver(&lpc32xx_hs_reg);
 718
 719         return ret;
 720 }
 721
 722 static void __exit lpc32xx_hsuart_exit(void)
 723 {
 724         platform_driver_unregister(&serial_hs_lpc32xx_driver);
 725         uart_unregister_driver(&lpc32xx_hs_reg);
 726 }
 727
 728 module_init(lpc32xx_hsuart_init);
 729 module_exit(lpc32xx_hsuart_exit);
 730
 731 MODULE_AUTHOR("Kevin Wells <[email protected]>");
 732 MODULE_AUTHOR("Roland Stigge <[email protected]>");
 733 MODULE_DESCRIPTION("NXP LPC32XX High Speed UART driver");
 734 MODULE_LICENSE("GPL");