drivers/tty/serial/samsung.c

   1 /*
   2  * Driver core for Samsung SoC onboard UARTs.
   3  *
   4  * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
   5  *      http://armlinux.simtec.co.uk/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10 */
  11
  12 /* Hote on 2410 error handling
  13  *
  14  * The s3c2410 manual has a love/hate affair with the contents of the
  15  * UERSTAT register in the UART blocks, and keeps marking some of the
  16  * error bits as reserved. Having checked with the s3c2410x01,
  17  * it copes with BREAKs properly, so I am happy to ignore the RESERVED
  18  * feature from the latter versions of the manual.
  19  *
  20  * If it becomes aparrent that latter versions of the 2410 remove these
  21  * bits, then action will have to be taken to differentiate the versions
  22  * and change the policy on BREAK
  23  *
  24  * BJD, 04-Nov-2004
  25 */
  26
  27 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  28 #define SUPPORT_SYSRQ
  29 #endif
  30
  31 #include <linux/dmaengine.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/slab.h>
  34 #include <linux/module.h>
  35 #include <linux/ioport.h>
  36 #include <linux/io.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/init.h>
  39 #include <linux/sysrq.h>
  40 #include <linux/console.h>
  41 #include <linux/tty.h>
  42 #include <linux/tty_flip.h>
  43 #include <linux/serial_core.h>
  44 #include <linux/serial.h>
  45 #include <linux/serial_s3c.h>
  46 #include <linux/delay.h>
  47 #include <linux/clk.h>
  48 #include <linux/cpufreq.h>
  49 #include <linux/of.h>
  50
  51 #include <asm/irq.h>
  52
  53 #include "samsung.h"
  54
  55 #if     defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \
  56         !defined(MODULE)
  57
  58 extern void printascii(const char *);
  59
  60 __printf(1, 2)
  61 static void dbg(const char *fmt, ...)
  62 {
  63         va_list va;
  64         char buff[256];
  65
  66         va_start(va, fmt);
  67         vscnprintf(buff, sizeof(buff), fmt, va);
  68         va_end(va);
  69
  70         printascii(buff);
  71 }
  72
  73 #else
  74 #define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0)
  75 #endif
  76
  77 /* UART name and device definitions */
  78
  79 #define S3C24XX_SERIAL_NAME     "ttySAC"
  80 #define S3C24XX_SERIAL_MAJOR    204
  81 #define S3C24XX_SERIAL_MINOR    64
  82
  83 #define S3C24XX_TX_PIO                  1
  84 #define S3C24XX_TX_DMA                  2
  85 #define S3C24XX_RX_PIO                  1
  86 #define S3C24XX_RX_DMA                  2
  87 /* macros to change one thing to another */
  88
  89 #define tx_enabled(port) ((port)->unused[0])
  90 #define rx_enabled(port) ((port)->unused[1])
  91
  92 /* flag to ignore all characters coming in */
  93 #define RXSTAT_DUMMY_READ (0x10000000)
  94
  95 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
  96 {
  97         return container_of(port, struct s3c24xx_uart_port, port);
  98 }
  99
 100 /* translate a port to the device name */
 101
 102 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
 103 {
 104         return to_platform_device(port->dev)->name;
 105 }
 106
 107 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
 108 {
 109         return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
 110 }
 111
 112 /*
 113  * s3c64xx and later SoC's include the interrupt mask and status registers in
 114  * the controller itself, unlike the s3c24xx SoC's which have these registers
 115  * in the interrupt controller. Check if the port type is s3c64xx or higher.
 116  */
 117 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
 118 {
 119         return to_ourport(port)->info->type == PORT_S3C6400;
 120 }
 121
 122 static void s3c24xx_serial_rx_enable(struct uart_port *port)
 123 {
 124         unsigned long flags;
 125         unsigned int ucon, ufcon;
 126         int count = 10000;
 127
 128         spin_lock_irqsave(&port->lock, flags);
 129
 130         while (--count && !s3c24xx_serial_txempty_nofifo(port))
 131                 udelay(100);
 132
 133         ufcon = rd_regl(port, S3C2410_UFCON);
 134         ufcon |= S3C2410_UFCON_RESETRX;
 135         wr_regl(port, S3C2410_UFCON, ufcon);
 136
 137         ucon = rd_regl(port, S3C2410_UCON);
 138         ucon |= S3C2410_UCON_RXIRQMODE;
 139         wr_regl(port, S3C2410_UCON, ucon);
 140
 141         rx_enabled(port) = 1;
 142         spin_unlock_irqrestore(&port->lock, flags);
 143 }
 144
 145 static void s3c24xx_serial_rx_disable(struct uart_port *port)
 146 {
 147         unsigned long flags;
 148         unsigned int ucon;
 149
 150         spin_lock_irqsave(&port->lock, flags);
 151
 152         ucon = rd_regl(port, S3C2410_UCON);
 153         ucon &= ~S3C2410_UCON_RXIRQMODE;
 154         wr_regl(port, S3C2410_UCON, ucon);
 155
 156         rx_enabled(port) = 0;
 157         spin_unlock_irqrestore(&port->lock, flags);
 158 }
 159
 160 static void s3c24xx_serial_stop_tx(struct uart_port *port)
 161 {
 162         struct s3c24xx_uart_port *ourport = to_ourport(port);
 163         struct s3c24xx_uart_dma *dma = ourport->dma;
 164         struct circ_buf *xmit = &port->state->xmit;
 165         struct dma_tx_state state;
 166         int count;
 167
 168         if (!tx_enabled(port))
 169                 return;
 170
 171         if (s3c24xx_serial_has_interrupt_mask(port))
 172                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 173         else
 174                 disable_irq_nosync(ourport->tx_irq);
 175
 176         if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
 177                 dmaengine_pause(dma->tx_chan);
 178                 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 179                 dmaengine_terminate_all(dma->tx_chan);
 180                 dma_sync_single_for_cpu(ourport->port.dev,
 181                         dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
 182                 async_tx_ack(dma->tx_desc);
 183                 count = dma->tx_bytes_requested - state.residue;
 184                 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
 185                 port->icount.tx += count;
 186         }
 187
 188         tx_enabled(port) = 0;
 189         ourport->tx_in_progress = 0;
 190
 191         if (port->flags & UPF_CONS_FLOW)
 192                 s3c24xx_serial_rx_enable(port);
 193
 194         ourport->tx_mode = 0;
 195 }
 196
 197 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
 198
 199 static void s3c24xx_serial_tx_dma_complete(void *args)
 200 {
 201         struct s3c24xx_uart_port *ourport = args;
 202         struct uart_port *port = &ourport->port;
 203         struct circ_buf *xmit = &port->state->xmit;
 204         struct s3c24xx_uart_dma *dma = ourport->dma;
 205         struct dma_tx_state state;
 206         unsigned long flags;
 207         int count;
 208
 209
 210         dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 211         count = dma->tx_bytes_requested - state.residue;
 212         async_tx_ack(dma->tx_desc);
 213
 214         dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
 215                                 dma->tx_size, DMA_TO_DEVICE);
 216
 217         spin_lock_irqsave(&port->lock, flags);
 218
 219         xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
 220         port->icount.tx += count;
 221         ourport->tx_in_progress = 0;
 222
 223         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 224                 uart_write_wakeup(port);
 225
 226         s3c24xx_serial_start_next_tx(ourport);
 227         spin_unlock_irqrestore(&port->lock, flags);
 228 }
 229
 230 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
 231 {
 232         struct uart_port *port = &ourport->port;
 233         u32 ucon;
 234
 235         /* Mask Tx interrupt */
 236         if (s3c24xx_serial_has_interrupt_mask(port))
 237                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 238         else
 239                 disable_irq_nosync(ourport->tx_irq);
 240
 241         /* Enable tx dma mode */
 242         ucon = rd_regl(port, S3C2410_UCON);
 243         ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
 244         ucon |= (dma_get_cache_alignment() >= 16) ?
 245                 S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
 246         ucon |= S3C64XX_UCON_TXMODE_DMA;
 247         wr_regl(port,  S3C2410_UCON, ucon);
 248
 249         ourport->tx_mode = S3C24XX_TX_DMA;
 250 }
 251
 252 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
 253 {
 254         struct uart_port *port = &ourport->port;
 255         u32 ucon, ufcon;
 256
 257         /* Set ufcon txtrig */
 258         ourport->tx_in_progress = S3C24XX_TX_PIO;
 259         ufcon = rd_regl(port, S3C2410_UFCON);
 260         wr_regl(port,  S3C2410_UFCON, ufcon);
 261
 262         /* Enable tx pio mode */
 263         ucon = rd_regl(port, S3C2410_UCON);
 264         ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
 265         ucon |= S3C64XX_UCON_TXMODE_CPU;
 266         wr_regl(port,  S3C2410_UCON, ucon);
 267
 268         /* Unmask Tx interrupt */
 269         if (s3c24xx_serial_has_interrupt_mask(port))
 270                 s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
 271                                   S3C64XX_UINTM);
 272         else
 273                 enable_irq(ourport->tx_irq);
 274
 275         ourport->tx_mode = S3C24XX_TX_PIO;
 276 }
 277
 278 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
 279 {
 280         if (ourport->tx_mode != S3C24XX_TX_PIO)
 281                 enable_tx_pio(ourport);
 282 }
 283
 284 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
 285                                       unsigned int count)
 286 {
 287         struct uart_port *port = &ourport->port;
 288         struct circ_buf *xmit = &port->state->xmit;
 289         struct s3c24xx_uart_dma *dma = ourport->dma;
 290
 291
 292         if (ourport->tx_mode != S3C24XX_TX_DMA)
 293                 enable_tx_dma(ourport);
 294
 295         dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
 296         dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
 297
 298         dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
 299                                 dma->tx_size, DMA_TO_DEVICE);
 300
 301         dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
 302                                 dma->tx_transfer_addr, dma->tx_size,
 303                                 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
 304         if (!dma->tx_desc) {
 305                 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
 306                 return -EIO;
 307         }
 308
 309         dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
 310         dma->tx_desc->callback_param = ourport;
 311         dma->tx_bytes_requested = dma->tx_size;
 312
 313         ourport->tx_in_progress = S3C24XX_TX_DMA;
 314         dma->tx_cookie = dmaengine_submit(dma->tx_desc);
 315         dma_async_issue_pending(dma->tx_chan);
 316         return 0;
 317 }
 318
 319 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
 320 {
 321         struct uart_port *port = &ourport->port;
 322         struct circ_buf *xmit = &port->state->xmit;
 323         unsigned long count;
 324
 325         /* Get data size up to the end of buffer */
 326         count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 327
 328         if (!count) {
 329                 s3c24xx_serial_stop_tx(port);
 330                 return;
 331         }
 332
 333         if (!ourport->dma || !ourport->dma->tx_chan ||
 334             count < ourport->min_dma_size ||
 335             xmit->tail & (dma_get_cache_alignment() - 1))
 336                 s3c24xx_serial_start_tx_pio(ourport);
 337         else
 338                 s3c24xx_serial_start_tx_dma(ourport, count);
 339 }
 340
 341 static void s3c24xx_serial_start_tx(struct uart_port *port)
 342 {
 343         struct s3c24xx_uart_port *ourport = to_ourport(port);
 344         struct circ_buf *xmit = &port->state->xmit;
 345
 346         if (!tx_enabled(port)) {
 347                 if (port->flags & UPF_CONS_FLOW)
 348                         s3c24xx_serial_rx_disable(port);
 349
 350                 tx_enabled(port) = 1;
 351                 if (!ourport->dma || !ourport->dma->tx_chan)
 352                         s3c24xx_serial_start_tx_pio(ourport);
 353         }
 354
 355         if (ourport->dma && ourport->dma->tx_chan) {
 356                 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
 357                         s3c24xx_serial_start_next_tx(ourport);
 358         }
 359 }
 360
 361 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
 362                 struct tty_port *tty, int count)
 363 {
 364         struct s3c24xx_uart_dma *dma = ourport->dma;
 365         int copied;
 366
 367         if (!count)
 368                 return;
 369
 370         dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
 371                                 dma->rx_size, DMA_FROM_DEVICE);
 372
 373         ourport->port.icount.rx += count;
 374         if (!tty) {
 375                 dev_err(ourport->port.dev, "No tty port\n");
 376                 return;
 377         }
 378         copied = tty_insert_flip_string(tty,
 379                         ((unsigned char *)(ourport->dma->rx_buf)), count);
 380         if (copied != count) {
 381                 WARN_ON(1);
 382                 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
 383         }
 384 }
 385
 386 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 387 {
 388         struct s3c24xx_uart_port *ourport = to_ourport(port);
 389         struct s3c24xx_uart_dma *dma = ourport->dma;
 390         struct tty_port *t = &port->state->port;
 391         struct dma_tx_state state;
 392         enum dma_status dma_status;
 393         unsigned int received;
 394
 395         if (rx_enabled(port)) {
 396                 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
 397                 if (s3c24xx_serial_has_interrupt_mask(port))
 398                         s3c24xx_set_bit(port, S3C64XX_UINTM_RXD,
 399                                         S3C64XX_UINTM);
 400                 else
 401                         disable_irq_nosync(ourport->rx_irq);
 402                 rx_enabled(port) = 0;
 403         }
 404         if (dma && dma->rx_chan) {
 405                 dmaengine_pause(dma->tx_chan);
 406                 dma_status = dmaengine_tx_status(dma->rx_chan,
 407                                 dma->rx_cookie, &state);
 408                 if (dma_status == DMA_IN_PROGRESS ||
 409                         dma_status == DMA_PAUSED) {
 410                         received = dma->rx_bytes_requested - state.residue;
 411                         dmaengine_terminate_all(dma->rx_chan);
 412                         s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 413                 }
 414         }
 415 }
 416
 417 static inline struct s3c24xx_uart_info
 418         *s3c24xx_port_to_info(struct uart_port *port)
 419 {
 420         return to_ourport(port)->info;
 421 }
 422
 423 static inline struct s3c2410_uartcfg
 424         *s3c24xx_port_to_cfg(struct uart_port *port)
 425 {
 426         struct s3c24xx_uart_port *ourport;
 427
 428         if (port->dev == NULL)
 429                 return NULL;
 430
 431         ourport = container_of(port, struct s3c24xx_uart_port, port);
 432         return ourport->cfg;
 433 }
 434
 435 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
 436                                      unsigned long ufstat)
 437 {
 438         struct s3c24xx_uart_info *info = ourport->info;
 439
 440         if (ufstat & info->rx_fifofull)
 441                 return ourport->port.fifosize;
 442
 443         return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
 444 }
 445
 446 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
 447 static void s3c24xx_serial_rx_dma_complete(void *args)
 448 {
 449         struct s3c24xx_uart_port *ourport = args;
 450         struct uart_port *port = &ourport->port;
 451
 452         struct s3c24xx_uart_dma *dma = ourport->dma;
 453         struct tty_port *t = &port->state->port;
 454         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 455
 456         struct dma_tx_state state;
 457         unsigned long flags;
 458         int received;
 459
 460         dmaengine_tx_status(dma->rx_chan,  dma->rx_cookie, &state);
 461         received  = dma->rx_bytes_requested - state.residue;
 462         async_tx_ack(dma->rx_desc);
 463
 464         spin_lock_irqsave(&port->lock, flags);
 465
 466         if (received)
 467                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 468
 469         if (tty) {
 470                 tty_flip_buffer_push(t);
 471                 tty_kref_put(tty);
 472         }
 473
 474         s3c64xx_start_rx_dma(ourport);
 475
 476         spin_unlock_irqrestore(&port->lock, flags);
 477 }
 478
 479 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
 480 {
 481         struct s3c24xx_uart_dma *dma = ourport->dma;
 482
 483         dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
 484                                 dma->rx_size, DMA_FROM_DEVICE);
 485
 486         dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
 487                                 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
 488                                 DMA_PREP_INTERRUPT);
 489         if (!dma->rx_desc) {
 490                 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
 491                 return;
 492         }
 493
 494         dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
 495         dma->rx_desc->callback_param = ourport;
 496         dma->rx_bytes_requested = dma->rx_size;
 497
 498         dma->rx_cookie = dmaengine_submit(dma->rx_desc);
 499         dma_async_issue_pending(dma->rx_chan);
 500 }
 501
 502 /* ? - where has parity gone?? */
 503 #define S3C2410_UERSTAT_PARITY (0x1000)
 504
 505 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
 506 {
 507         struct uart_port *port = &ourport->port;
 508         unsigned int ucon;
 509
 510         /* set Rx mode to DMA mode */
 511         ucon = rd_regl(port, S3C2410_UCON);
 512         ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
 513                         S3C64XX_UCON_TIMEOUT_MASK |
 514                         S3C64XX_UCON_EMPTYINT_EN |
 515                         S3C64XX_UCON_DMASUS_EN |
 516                         S3C64XX_UCON_TIMEOUT_EN |
 517                         S3C64XX_UCON_RXMODE_MASK);
 518         ucon |= S3C64XX_UCON_RXBURST_16 |
 519                         0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 520                         S3C64XX_UCON_EMPTYINT_EN |
 521                         S3C64XX_UCON_TIMEOUT_EN |
 522                         S3C64XX_UCON_RXMODE_DMA;
 523         wr_regl(port, S3C2410_UCON, ucon);
 524
 525         ourport->rx_mode = S3C24XX_RX_DMA;
 526 }
 527
 528 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
 529 {
 530         struct uart_port *port = &ourport->port;
 531         unsigned int ucon;
 532
 533         /* set Rx mode to DMA mode */
 534         ucon = rd_regl(port, S3C2410_UCON);
 535         ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
 536                         S3C64XX_UCON_EMPTYINT_EN |
 537                         S3C64XX_UCON_DMASUS_EN |
 538                         S3C64XX_UCON_TIMEOUT_EN |
 539                         S3C64XX_UCON_RXMODE_MASK);
 540         ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 541                         S3C64XX_UCON_TIMEOUT_EN |
 542                         S3C64XX_UCON_RXMODE_CPU;
 543         wr_regl(port, S3C2410_UCON, ucon);
 544
 545         ourport->rx_mode = S3C24XX_RX_PIO;
 546 }
 547
 548 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
 549
 550 static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
 551 {
 552         unsigned int utrstat, ufstat, received;
 553         struct s3c24xx_uart_port *ourport = dev_id;
 554         struct uart_port *port = &ourport->port;
 555         struct s3c24xx_uart_dma *dma = ourport->dma;
 556         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 557         struct tty_port *t = &port->state->port;
 558         unsigned long flags;
 559         struct dma_tx_state state;
 560
 561         utrstat = rd_regl(port, S3C2410_UTRSTAT);
 562         ufstat = rd_regl(port, S3C2410_UFSTAT);
 563
 564         spin_lock_irqsave(&port->lock, flags);
 565
 566         if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
 567                 s3c64xx_start_rx_dma(ourport);
 568                 if (ourport->rx_mode == S3C24XX_RX_PIO)
 569                         enable_rx_dma(ourport);
 570                 goto finish;
 571         }
 572
 573         if (ourport->rx_mode == S3C24XX_RX_DMA) {
 574                 dmaengine_pause(dma->rx_chan);
 575                 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
 576                 dmaengine_terminate_all(dma->rx_chan);
 577                 received = dma->rx_bytes_requested - state.residue;
 578                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 579
 580                 enable_rx_pio(ourport);
 581         }
 582
 583         s3c24xx_serial_rx_drain_fifo(ourport);
 584
 585         if (tty) {
 586                 tty_flip_buffer_push(t);
 587                 tty_kref_put(tty);
 588         }
 589
 590         wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
 591
 592 finish:
 593         spin_unlock_irqrestore(&port->lock, flags);
 594
 595         return IRQ_HANDLED;
 596 }
 597
 598 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
 599 {
 600         struct uart_port *port = &ourport->port;
 601         unsigned int ufcon, ch, flag, ufstat, uerstat;
 602         unsigned int fifocnt = 0;
 603         int max_count = port->fifosize;
 604
 605         while (max_count-- > 0) {
 606                 /*
 607                  * Receive all characters known to be in FIFO
 608                  * before reading FIFO level again
 609                  */
 610                 if (fifocnt == 0) {
 611                         ufstat = rd_regl(port, S3C2410_UFSTAT);
 612                         fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
 613                         if (fifocnt == 0)
 614                                 break;
 615                 }
 616                 fifocnt--;
 617
 618                 uerstat = rd_regl(port, S3C2410_UERSTAT);
 619                 ch = rd_regb(port, S3C2410_URXH);
 620
 621                 if (port->flags & UPF_CONS_FLOW) {
 622                         int txe = s3c24xx_serial_txempty_nofifo(port);
 623
 624                         if (rx_enabled(port)) {
 625                                 if (!txe) {
 626                                         rx_enabled(port) = 0;
 627                                         continue;
 628                                 }
 629                         } else {
 630                                 if (txe) {
 631                                         ufcon = rd_regl(port, S3C2410_UFCON);
 632                                         ufcon |= S3C2410_UFCON_RESETRX;
 633                                         wr_regl(port, S3C2410_UFCON, ufcon);
 634                                         rx_enabled(port) = 1;
 635                                         return;
 636                                 }
 637                                 continue;
 638                         }
 639                 }
 640
 641                 /* insert the character into the buffer */
 642
 643                 flag = TTY_NORMAL;
 644                 port->icount.rx++;
 645
 646                 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
 647                         dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
 648                             ch, uerstat);
 649
 650                         /* check for break */
 651                         if (uerstat & S3C2410_UERSTAT_BREAK) {
 652                                 dbg("break!\n");
 653                                 port->icount.brk++;
 654                                 if (uart_handle_break(port))
 655                                         continue; /* Ignore character */
 656                         }
 657
 658                         if (uerstat & S3C2410_UERSTAT_FRAME)
 659                                 port->icount.frame++;
 660                         if (uerstat & S3C2410_UERSTAT_OVERRUN)
 661                                 port->icount.overrun++;
 662
 663                         uerstat &= port->read_status_mask;
 664
 665                         if (uerstat & S3C2410_UERSTAT_BREAK)
 666                                 flag = TTY_BREAK;
 667                         else if (uerstat & S3C2410_UERSTAT_PARITY)
 668                                 flag = TTY_PARITY;
 669                         else if (uerstat & (S3C2410_UERSTAT_FRAME |
 670                                             S3C2410_UERSTAT_OVERRUN))
 671                                 flag = TTY_FRAME;
 672                 }
 673
 674                 if (uart_handle_sysrq_char(port, ch))
 675                         continue; /* Ignore character */
 676
 677                 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
 678                                  ch, flag);
 679         }
 680
 681         tty_flip_buffer_push(&port->state->port);
 682 }
 683
 684 static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
 685 {
 686         struct s3c24xx_uart_port *ourport = dev_id;
 687         struct uart_port *port = &ourport->port;
 688         unsigned long flags;
 689
 690         spin_lock_irqsave(&port->lock, flags);
 691         s3c24xx_serial_rx_drain_fifo(ourport);
 692         spin_unlock_irqrestore(&port->lock, flags);
 693
 694         return IRQ_HANDLED;
 695 }
 696
 697
 698 static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
 699 {
 700         struct s3c24xx_uart_port *ourport = dev_id;
 701
 702         if (ourport->dma && ourport->dma->rx_chan)
 703                 return s3c24xx_serial_rx_chars_dma(dev_id);
 704         return s3c24xx_serial_rx_chars_pio(dev_id);
 705 }
 706
 707 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 708 {
 709         struct s3c24xx_uart_port *ourport = id;
 710         struct uart_port *port = &ourport->port;
 711         struct circ_buf *xmit = &port->state->xmit;
 712         unsigned long flags;
 713         int count, dma_count = 0;
 714
 715         spin_lock_irqsave(&port->lock, flags);
 716
 717         count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 718
 719         if (ourport->dma && ourport->dma->tx_chan &&
 720             count >= ourport->min_dma_size) {
 721                 int align = dma_get_cache_alignment() -
 722                         (xmit->tail & (dma_get_cache_alignment() - 1));
 723                 if (count-align >= ourport->min_dma_size) {
 724                         dma_count = count-align;
 725                         count = align;
 726                 }
 727         }
 728
 729         if (port->x_char) {
 730                 wr_regb(port, S3C2410_UTXH, port->x_char);
 731                 port->icount.tx++;
 732                 port->x_char = 0;
 733                 goto out;
 734         }
 735
 736         /* if there isn't anything more to transmit, or the uart is now
 737          * stopped, disable the uart and exit
 738         */
 739
 740         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 741                 s3c24xx_serial_stop_tx(port);
 742                 goto out;
 743         }
 744
 745         /* try and drain the buffer... */
 746
 747         if (count > port->fifosize) {
 748                 count = port->fifosize;
 749                 dma_count = 0;
 750         }
 751
 752         while (!uart_circ_empty(xmit) && count > 0) {
 753                 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
 754                         break;
 755
 756                 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
 757                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 758                 port->icount.tx++;
 759                 count--;
 760         }
 761
 762         if (!count && dma_count) {
 763                 s3c24xx_serial_start_tx_dma(ourport, dma_count);
 764                 goto out;
 765         }
 766
 767         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
 768                 spin_unlock(&port->lock);
 769                 uart_write_wakeup(port);
 770                 spin_lock(&port->lock);
 771         }
 772
 773         if (uart_circ_empty(xmit))
 774                 s3c24xx_serial_stop_tx(port);
 775
 776 out:
 777         spin_unlock_irqrestore(&port->lock, flags);
 778         return IRQ_HANDLED;
 779 }
 780
 781 /* interrupt handler for s3c64xx and later SoC's.*/
 782 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
 783 {
 784         struct s3c24xx_uart_port *ourport = id;
 785         struct uart_port *port = &ourport->port;
 786         unsigned int pend = rd_regl(port, S3C64XX_UINTP);
 787         irqreturn_t ret = IRQ_HANDLED;
 788
 789         if (pend & S3C64XX_UINTM_RXD_MSK) {
 790                 ret = s3c24xx_serial_rx_chars(irq, id);
 791                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
 792         }
 793         if (pend & S3C64XX_UINTM_TXD_MSK) {
 794                 ret = s3c24xx_serial_tx_chars(irq, id);
 795                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
 796         }
 797         return ret;
 798 }
 799
 800 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 801 {
 802         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 803         unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
 804         unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
 805
 806         if (ufcon & S3C2410_UFCON_FIFOMODE) {
 807                 if ((ufstat & info->tx_fifomask) != 0 ||
 808                     (ufstat & info->tx_fifofull))
 809                         return 0;
 810
 811                 return 1;
 812         }
 813
 814         return s3c24xx_serial_txempty_nofifo(port);
 815 }
 816
 817 /* no modem control lines */
 818 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
 819 {
 820         unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
 821
 822         if (umstat & S3C2410_UMSTAT_CTS)
 823                 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 824         else
 825                 return TIOCM_CAR | TIOCM_DSR;
 826 }
 827
 828 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 829 {
 830         unsigned int umcon = rd_regl(port, S3C2410_UMCON);
 831
 832         if (mctrl & TIOCM_RTS)
 833                 umcon |= S3C2410_UMCOM_RTS_LOW;
 834         else
 835                 umcon &= ~S3C2410_UMCOM_RTS_LOW;
 836
 837         wr_regl(port, S3C2410_UMCON, umcon);
 838 }
 839
 840 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
 841 {
 842         unsigned long flags;
 843         unsigned int ucon;
 844
 845         spin_lock_irqsave(&port->lock, flags);
 846
 847         ucon = rd_regl(port, S3C2410_UCON);
 848
 849         if (break_state)
 850                 ucon |= S3C2410_UCON_SBREAK;
 851         else
 852                 ucon &= ~S3C2410_UCON_SBREAK;
 853
 854         wr_regl(port, S3C2410_UCON, ucon);
 855
 856         spin_unlock_irqrestore(&port->lock, flags);
 857 }
 858
 859 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
 860 {
 861         struct s3c24xx_uart_dma *dma = p->dma;
 862         unsigned long flags;
 863
 864         /* Default slave configuration parameters */
 865         dma->rx_conf.direction          = DMA_DEV_TO_MEM;
 866         dma->rx_conf.src_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
 867         dma->rx_conf.src_addr           = p->port.mapbase + S3C2410_URXH;
 868         dma->rx_conf.src_maxburst       = 16;
 869
 870         dma->tx_conf.direction          = DMA_MEM_TO_DEV;
 871         dma->tx_conf.dst_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
 872         dma->tx_conf.dst_addr           = p->port.mapbase + S3C2410_UTXH;
 873         if (dma_get_cache_alignment() >= 16)
 874                 dma->tx_conf.dst_maxburst = 16;
 875         else
 876                 dma->tx_conf.dst_maxburst = 1;
 877
 878         dma->rx_chan = dma_request_chan(p->port.dev, "rx");
 879
 880         if (IS_ERR(dma->rx_chan))
 881                 return PTR_ERR(dma->rx_chan);
 882
 883         dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
 884
 885         dma->tx_chan = dma_request_chan(p->port.dev, "tx");
 886         if (IS_ERR(dma->tx_chan)) {
 887                 dma_release_channel(dma->rx_chan);
 888                 return PTR_ERR(dma->tx_chan);
 889         }
 890
 891         dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
 892
 893         /* RX buffer */
 894         dma->rx_size = PAGE_SIZE;
 895
 896         dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
 897
 898         if (!dma->rx_buf) {
 899                 dma_release_channel(dma->rx_chan);
 900                 dma_release_channel(dma->tx_chan);
 901                 return -ENOMEM;
 902         }
 903
 904         dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
 905                                 dma->rx_size, DMA_FROM_DEVICE);
 906
 907         spin_lock_irqsave(&p->port.lock, flags);
 908
 909         /* TX buffer */
 910         dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
 911                                 p->port.state->xmit.buf,
 912                                 UART_XMIT_SIZE, DMA_TO_DEVICE);
 913
 914         spin_unlock_irqrestore(&p->port.lock, flags);
 915
 916         return 0;
 917 }
 918
 919 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
 920 {
 921         struct s3c24xx_uart_dma *dma = p->dma;
 922
 923         if (dma->rx_chan) {
 924                 dmaengine_terminate_all(dma->rx_chan);
 925                 dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
 926                                 dma->rx_size, DMA_FROM_DEVICE);
 927                 kfree(dma->rx_buf);
 928                 dma_release_channel(dma->rx_chan);
 929                 dma->rx_chan = NULL;
 930         }
 931
 932         if (dma->tx_chan) {
 933                 dmaengine_terminate_all(dma->tx_chan);
 934                 dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
 935                                 UART_XMIT_SIZE, DMA_TO_DEVICE);
 936                 dma_release_channel(dma->tx_chan);
 937                 dma->tx_chan = NULL;
 938         }
 939 }
 940
 941 static void s3c24xx_serial_shutdown(struct uart_port *port)
 942 {
 943         struct s3c24xx_uart_port *ourport = to_ourport(port);
 944
 945         if (ourport->tx_claimed) {
 946                 if (!s3c24xx_serial_has_interrupt_mask(port))
 947                         free_irq(ourport->tx_irq, ourport);
 948                 tx_enabled(port) = 0;
 949                 ourport->tx_claimed = 0;
 950                 ourport->tx_mode = 0;
 951         }
 952
 953         if (ourport->rx_claimed) {
 954                 if (!s3c24xx_serial_has_interrupt_mask(port))
 955                         free_irq(ourport->rx_irq, ourport);
 956                 ourport->rx_claimed = 0;
 957                 rx_enabled(port) = 0;
 958         }
 959
 960         /* Clear pending interrupts and mask all interrupts */
 961         if (s3c24xx_serial_has_interrupt_mask(port)) {
 962                 free_irq(port->irq, ourport);
 963
 964                 wr_regl(port, S3C64XX_UINTP, 0xf);
 965                 wr_regl(port, S3C64XX_UINTM, 0xf);
 966         }
 967
 968         if (ourport->dma)
 969                 s3c24xx_serial_release_dma(ourport);
 970
 971         ourport->tx_in_progress = 0;
 972 }
 973
 974 static int s3c24xx_serial_startup(struct uart_port *port)
 975 {
 976         struct s3c24xx_uart_port *ourport = to_ourport(port);
 977         int ret;
 978
 979         dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n",
 980             port, (unsigned long long)port->mapbase, port->membase);
 981
 982         rx_enabled(port) = 1;
 983
 984         ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
 985                           s3c24xx_serial_portname(port), ourport);
 986
 987         if (ret != 0) {
 988                 dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
 989                 return ret;
 990         }
 991
 992         ourport->rx_claimed = 1;
 993
 994         dbg("requesting tx irq...\n");
 995
 996         tx_enabled(port) = 1;
 997
 998         ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
 999                           s3c24xx_serial_portname(port), ourport);
1000
1001         if (ret) {
1002                 dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
1003                 goto err;
1004         }
1005
1006         ourport->tx_claimed = 1;
1007
1008         dbg("s3c24xx_serial_startup ok\n");
1009
1010         /* the port reset code should have done the correct
1011          * register setup for the port controls */
1012
1013         return ret;
1014
1015 err:
1016         s3c24xx_serial_shutdown(port);
1017         return ret;
1018 }
1019
1020 static int s3c64xx_serial_startup(struct uart_port *port)
1021 {
1022         struct s3c24xx_uart_port *ourport = to_ourport(port);
1023         unsigned long flags;
1024         unsigned int ufcon;
1025         int ret;
1026
1027         dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
1028             port, (unsigned long long)port->mapbase, port->membase);
1029
1030         wr_regl(port, S3C64XX_UINTM, 0xf);
1031         if (ourport->dma) {
1032                 ret = s3c24xx_serial_request_dma(ourport);
1033                 if (ret < 0) {
1034                         dev_warn(port->dev,
1035                                  "DMA request failed, DMA will not be used\n");
1036                         devm_kfree(port->dev, ourport->dma);
1037                         ourport->dma = NULL;
1038                 }
1039         }
1040
1041         ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1042                           s3c24xx_serial_portname(port), ourport);
1043         if (ret) {
1044                 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1045                 return ret;
1046         }
1047
1048         /* For compatibility with s3c24xx Soc's */
1049         rx_enabled(port) = 1;
1050         ourport->rx_claimed = 1;
1051         tx_enabled(port) = 0;
1052         ourport->tx_claimed = 1;
1053
1054         spin_lock_irqsave(&port->lock, flags);
1055
1056         ufcon = rd_regl(port, S3C2410_UFCON);
1057         ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1058         if (!uart_console(port))
1059                 ufcon |= S3C2410_UFCON_RESETTX;
1060         wr_regl(port, S3C2410_UFCON, ufcon);
1061
1062         enable_rx_pio(ourport);
1063
1064         spin_unlock_irqrestore(&port->lock, flags);
1065
1066         /* Enable Rx Interrupt */
1067         s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM);
1068
1069         dbg("s3c64xx_serial_startup ok\n");
1070         return ret;
1071 }
1072
1073 /* power power management control */
1074
1075 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1076                               unsigned int old)
1077 {
1078         struct s3c24xx_uart_port *ourport = to_ourport(port);
1079         int timeout = 10000;
1080
1081         ourport->pm_level = level;
1082
1083         switch (level) {
1084         case 3:
1085                 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1086                         udelay(100);
1087
1088                 if (!IS_ERR(ourport->baudclk))
1089                         clk_disable_unprepare(ourport->baudclk);
1090
1091                 clk_disable_unprepare(ourport->clk);
1092                 break;
1093
1094         case 0:
1095                 clk_prepare_enable(ourport->clk);
1096
1097                 if (!IS_ERR(ourport->baudclk))
1098                         clk_prepare_enable(ourport->baudclk);
1099
1100                 break;
1101         default:
1102                 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1103         }
1104 }
1105
1106 /* baud rate calculation
1107  *
1108  * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1109  * of different sources, including the peripheral clock ("pclk") and an
1110  * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1111  * with a programmable extra divisor.
1112  *
1113  * The following code goes through the clock sources, and calculates the
1114  * baud clocks (and the resultant actual baud rates) and then tries to
1115  * pick the closest one and select that.
1116  *
1117 */
1118
1119 #define MAX_CLK_NAME_LENGTH 15
1120
1121 static inline int s3c24xx_serial_getsource(struct uart_port *port)
1122 {
1123         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1124         unsigned int ucon;
1125
1126         if (info->num_clks == 1)
1127                 return 0;
1128
1129         ucon = rd_regl(port, S3C2410_UCON);
1130         ucon &= info->clksel_mask;
1131         return ucon >> info->clksel_shift;
1132 }
1133
1134 static void s3c24xx_serial_setsource(struct uart_port *port,
1135                         unsigned int clk_sel)
1136 {
1137         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1138         unsigned int ucon;
1139
1140         if (info->num_clks == 1)
1141                 return;
1142
1143         ucon = rd_regl(port, S3C2410_UCON);
1144         if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1145                 return;
1146
1147         ucon &= ~info->clksel_mask;
1148         ucon |= clk_sel << info->clksel_shift;
1149         wr_regl(port, S3C2410_UCON, ucon);
1150 }
1151
1152 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1153                         unsigned int req_baud, struct clk **best_clk,
1154                         unsigned int *clk_num)
1155 {
1156         struct s3c24xx_uart_info *info = ourport->info;
1157         struct clk *clk;
1158         unsigned long rate;
1159         unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
1160         char clkname[MAX_CLK_NAME_LENGTH];
1161         int calc_deviation, deviation = (1 << 30) - 1;
1162
1163         clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
1164                         ourport->info->def_clk_sel;
1165         for (cnt = 0; cnt < info->num_clks; cnt++) {
1166                 if (!(clk_sel & (1 << cnt)))
1167                         continue;
1168
1169                 sprintf(clkname, "clk_uart_baud%d", cnt);
1170                 clk = clk_get(ourport->port.dev, clkname);
1171                 if (IS_ERR(clk))
1172                         continue;
1173
1174                 rate = clk_get_rate(clk);
1175                 if (!rate)
1176                         continue;
1177
1178                 if (ourport->info->has_divslot) {
1179                         unsigned long div = rate / req_baud;
1180
1181                         /* The UDIVSLOT register on the newer UARTs allows us to
1182                          * get a divisor adjustment of 1/16th on the baud clock.
1183                          *
1184                          * We don't keep the UDIVSLOT value (the 16ths we
1185                          * calculated by not multiplying the baud by 16) as it
1186                          * is easy enough to recalculate.
1187                          */
1188
1189                         quot = div / 16;
1190                         baud = rate / div;
1191                 } else {
1192                         quot = (rate + (8 * req_baud)) / (16 * req_baud);
1193                         baud = rate / (quot * 16);
1194                 }
1195                 quot--;
1196
1197                 calc_deviation = req_baud - baud;
1198                 if (calc_deviation < 0)
1199                         calc_deviation = -calc_deviation;
1200
1201                 if (calc_deviation < deviation) {
1202                         *best_clk = clk;
1203                         best_quot = quot;
1204                         *clk_num = cnt;
1205                         deviation = calc_deviation;
1206                 }
1207         }
1208
1209         return best_quot;
1210 }
1211
1212 /* udivslot_table[]
1213  *
1214  * This table takes the fractional value of the baud divisor and gives
1215  * the recommended setting for the UDIVSLOT register.
1216  */
1217 static u16 udivslot_table[16] = {
1218         [0] = 0x0000,
1219         [1] = 0x0080,
1220         [2] = 0x0808,
1221         [3] = 0x0888,
1222         [4] = 0x2222,
1223         [5] = 0x4924,
1224         [6] = 0x4A52,
1225         [7] = 0x54AA,
1226         [8] = 0x5555,
1227         [9] = 0xD555,
1228         [10] = 0xD5D5,
1229         [11] = 0xDDD5,
1230         [12] = 0xDDDD,
1231         [13] = 0xDFDD,
1232         [14] = 0xDFDF,
1233         [15] = 0xFFDF,
1234 };
1235
1236 static void s3c24xx_serial_set_termios(struct uart_port *port,
1237                                        struct ktermios *termios,
1238                                        struct ktermios *old)
1239 {
1240         struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1241         struct s3c24xx_uart_port *ourport = to_ourport(port);
1242         struct clk *clk = ERR_PTR(-EINVAL);
1243         unsigned long flags;
1244         unsigned int baud, quot, clk_sel = 0;
1245         unsigned int ulcon;
1246         unsigned int umcon;
1247         unsigned int udivslot = 0;
1248
1249         /*
1250          * We don't support modem control lines.
1251          */
1252         termios->c_cflag &= ~(HUPCL | CMSPAR);
1253         termios->c_cflag |= CLOCAL;
1254
1255         /*
1256          * Ask the core to calculate the divisor for us.
1257          */
1258
1259         baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
1260         quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1261         if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1262                 quot = port->custom_divisor;
1263         if (IS_ERR(clk))
1264                 return;
1265
1266         /* check to see if we need  to change clock source */
1267
1268         if (ourport->baudclk != clk) {
1269                 clk_prepare_enable(clk);
1270
1271                 s3c24xx_serial_setsource(port, clk_sel);
1272
1273                 if (!IS_ERR(ourport->baudclk)) {
1274                         clk_disable_unprepare(ourport->baudclk);
1275                         ourport->baudclk = ERR_PTR(-EINVAL);
1276                 }
1277
1278                 ourport->baudclk = clk;
1279                 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1280         }
1281
1282         if (ourport->info->has_divslot) {
1283                 unsigned int div = ourport->baudclk_rate / baud;
1284
1285                 if (cfg->has_fracval) {
1286                         udivslot = (div & 15);
1287                         dbg("fracval = %04x\n", udivslot);
1288                 } else {
1289                         udivslot = udivslot_table[div & 15];
1290                         dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
1291                 }
1292         }
1293
1294         switch (termios->c_cflag & CSIZE) {
1295         case CS5:
1296                 dbg("config: 5bits/char\n");
1297                 ulcon = S3C2410_LCON_CS5;
1298                 break;
1299         case CS6:
1300                 dbg("config: 6bits/char\n");
1301                 ulcon = S3C2410_LCON_CS6;
1302                 break;
1303         case CS7:
1304                 dbg("config: 7bits/char\n");
1305                 ulcon = S3C2410_LCON_CS7;
1306                 break;
1307         case CS8:
1308         default:
1309                 dbg("config: 8bits/char\n");
1310                 ulcon = S3C2410_LCON_CS8;
1311                 break;
1312         }
1313
1314         /* preserve original lcon IR settings */
1315         ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1316
1317         if (termios->c_cflag & CSTOPB)
1318                 ulcon |= S3C2410_LCON_STOPB;
1319
1320         if (termios->c_cflag & PARENB) {
1321                 if (termios->c_cflag & PARODD)
1322                         ulcon |= S3C2410_LCON_PODD;
1323                 else
1324                         ulcon |= S3C2410_LCON_PEVEN;
1325         } else {
1326                 ulcon |= S3C2410_LCON_PNONE;
1327         }
1328
1329         spin_lock_irqsave(&port->lock, flags);
1330
1331         dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1332             ulcon, quot, udivslot);
1333
1334         wr_regl(port, S3C2410_ULCON, ulcon);
1335         wr_regl(port, S3C2410_UBRDIV, quot);
1336
1337         umcon = rd_regl(port, S3C2410_UMCON);
1338         if (termios->c_cflag & CRTSCTS) {
1339                 umcon |= S3C2410_UMCOM_AFC;
1340                 /* Disable RTS when RX FIFO contains 63 bytes */
1341                 umcon &= ~S3C2412_UMCON_AFC_8;
1342         } else {
1343                 umcon &= ~S3C2410_UMCOM_AFC;
1344         }
1345         wr_regl(port, S3C2410_UMCON, umcon);
1346
1347         if (ourport->info->has_divslot)
1348                 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1349
1350         dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1351             rd_regl(port, S3C2410_ULCON),
1352             rd_regl(port, S3C2410_UCON),
1353             rd_regl(port, S3C2410_UFCON));
1354
1355         /*
1356          * Update the per-port timeout.
1357          */
1358         uart_update_timeout(port, termios->c_cflag, baud);
1359
1360         /*
1361          * Which character status flags are we interested in?
1362          */
1363         port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1364         if (termios->c_iflag & INPCK)
1365                 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1366                         S3C2410_UERSTAT_PARITY;
1367         /*
1368          * Which character status flags should we ignore?
1369          */
1370         port->ignore_status_mask = 0;
1371         if (termios->c_iflag & IGNPAR)
1372                 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1373         if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1374                 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1375
1376         /*
1377          * Ignore all characters if CREAD is not set.
1378          */
1379         if ((termios->c_cflag & CREAD) == 0)
1380                 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1381
1382         spin_unlock_irqrestore(&port->lock, flags);
1383 }
1384
1385 static const char *s3c24xx_serial_type(struct uart_port *port)
1386 {
1387         switch (port->type) {
1388         case PORT_S3C2410:
1389                 return "S3C2410";
1390         case PORT_S3C2440:
1391                 return "S3C2440";
1392         case PORT_S3C2412:
1393                 return "S3C2412";
1394         case PORT_S3C6400:
1395                 return "S3C6400/10";
1396         default:
1397                 return NULL;
1398         }
1399 }
1400
1401 #define MAP_SIZE (0x100)
1402
1403 static void s3c24xx_serial_release_port(struct uart_port *port)
1404 {
1405         release_mem_region(port->mapbase, MAP_SIZE);
1406 }
1407
1408 static int s3c24xx_serial_request_port(struct uart_port *port)
1409 {
1410         const char *name = s3c24xx_serial_portname(port);
1411         return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
1412 }
1413
1414 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1415 {
1416         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1417
1418         if (flags & UART_CONFIG_TYPE &&
1419             s3c24xx_serial_request_port(port) == 0)
1420                 port->type = info->type;
1421 }
1422
1423 /*
1424  * verify the new serial_struct (for TIOCSSERIAL).
1425  */
1426 static int
1427 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1428 {
1429         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1430
1431         if (ser->type != PORT_UNKNOWN && ser->type != info->type)
1432                 return -EINVAL;
1433
1434         return 0;
1435 }
1436
1437
1438 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1439
1440 static struct console s3c24xx_serial_console;
1441
1442 static int __init s3c24xx_serial_console_init(void)
1443 {
1444         register_console(&s3c24xx_serial_console);
1445         return 0;
1446 }
1447 console_initcall(s3c24xx_serial_console_init);
1448
1449 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1450 #else
1451 #define S3C24XX_SERIAL_CONSOLE NULL
1452 #endif
1453
1454 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1455 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1456 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1457                          unsigned char c);
1458 #endif
1459
1460 static struct uart_ops s3c24xx_serial_ops = {
1461         .pm             = s3c24xx_serial_pm,
1462         .tx_empty       = s3c24xx_serial_tx_empty,
1463         .get_mctrl      = s3c24xx_serial_get_mctrl,
1464         .set_mctrl      = s3c24xx_serial_set_mctrl,
1465         .stop_tx        = s3c24xx_serial_stop_tx,
1466         .start_tx       = s3c24xx_serial_start_tx,
1467         .stop_rx        = s3c24xx_serial_stop_rx,
1468         .break_ctl      = s3c24xx_serial_break_ctl,
1469         .startup        = s3c24xx_serial_startup,
1470         .shutdown       = s3c24xx_serial_shutdown,
1471         .set_termios    = s3c24xx_serial_set_termios,
1472         .type           = s3c24xx_serial_type,
1473         .release_port   = s3c24xx_serial_release_port,
1474         .request_port   = s3c24xx_serial_request_port,
1475         .config_port    = s3c24xx_serial_config_port,
1476         .verify_port    = s3c24xx_serial_verify_port,
1477 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1478         .poll_get_char = s3c24xx_serial_get_poll_char,
1479         .poll_put_char = s3c24xx_serial_put_poll_char,
1480 #endif
1481 };
1482
1483 static struct uart_driver s3c24xx_uart_drv = {
1484         .owner          = THIS_MODULE,
1485         .driver_name    = "s3c2410_serial",
1486         .nr             = CONFIG_SERIAL_SAMSUNG_UARTS,
1487         .cons           = S3C24XX_SERIAL_CONSOLE,
1488         .dev_name       = S3C24XX_SERIAL_NAME,
1489         .major          = S3C24XX_SERIAL_MAJOR,
1490         .minor          = S3C24XX_SERIAL_MINOR,
1491 };
1492
1493 #define __PORT_LOCK_UNLOCKED(i) \
1494         __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
1495 static struct s3c24xx_uart_port
1496 s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
1497         [0] = {
1498                 .port = {
1499                         .lock           = __PORT_LOCK_UNLOCKED(0),
1500                         .iotype         = UPIO_MEM,
1501                         .uartclk        = 0,
1502                         .fifosize       = 16,
1503                         .ops            = &s3c24xx_serial_ops,
1504                         .flags          = UPF_BOOT_AUTOCONF,
1505                         .line           = 0,
1506                 }
1507         },
1508         [1] = {
1509                 .port = {
1510                         .lock           = __PORT_LOCK_UNLOCKED(1),
1511                         .iotype         = UPIO_MEM,
1512                         .uartclk        = 0,
1513                         .fifosize       = 16,
1514                         .ops            = &s3c24xx_serial_ops,
1515                         .flags          = UPF_BOOT_AUTOCONF,
1516                         .line           = 1,
1517                 }
1518         },
1519 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
1520
1521         [2] = {
1522                 .port = {
1523                         .lock           = __PORT_LOCK_UNLOCKED(2),
1524                         .iotype         = UPIO_MEM,
1525                         .uartclk        = 0,
1526                         .fifosize       = 16,
1527                         .ops            = &s3c24xx_serial_ops,
1528                         .flags          = UPF_BOOT_AUTOCONF,
1529                         .line           = 2,
1530                 }
1531         },
1532 #endif
1533 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
1534         [3] = {
1535                 .port = {
1536                         .lock           = __PORT_LOCK_UNLOCKED(3),
1537                         .iotype         = UPIO_MEM,
1538                         .uartclk        = 0,
1539                         .fifosize       = 16,
1540                         .ops            = &s3c24xx_serial_ops,
1541                         .flags          = UPF_BOOT_AUTOCONF,
1542                         .line           = 3,
1543                 }
1544         }
1545 #endif
1546 };
1547 #undef __PORT_LOCK_UNLOCKED
1548
1549 /* s3c24xx_serial_resetport
1550  *
1551  * reset the fifos and other the settings.
1552 */
1553
1554 static void s3c24xx_serial_resetport(struct uart_port *port,
1555                                    struct s3c2410_uartcfg *cfg)
1556 {
1557         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1558         unsigned long ucon = rd_regl(port, S3C2410_UCON);
1559         unsigned int ucon_mask;
1560
1561         ucon_mask = info->clksel_mask;
1562         if (info->type == PORT_S3C2440)
1563                 ucon_mask |= S3C2440_UCON0_DIVMASK;
1564
1565         ucon &= ucon_mask;
1566         wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
1567
1568         /* reset both fifos */
1569         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1570         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1571
1572         /* some delay is required after fifo reset */
1573         udelay(1);
1574 }
1575
1576
1577 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ
1578
1579 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
1580                                              unsigned long val, void *data)
1581 {
1582         struct s3c24xx_uart_port *port;
1583         struct uart_port *uport;
1584
1585         port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1586         uport = &port->port;
1587
1588         /* check to see if port is enabled */
1589
1590         if (port->pm_level != 0)
1591                 return 0;
1592
1593         /* try and work out if the baudrate is changing, we can detect
1594          * a change in rate, but we do not have support for detecting
1595          * a disturbance in the clock-rate over the change.
1596          */
1597
1598         if (IS_ERR(port->baudclk))
1599                 goto exit;
1600
1601         if (port->baudclk_rate == clk_get_rate(port->baudclk))
1602                 goto exit;
1603
1604         if (val == CPUFREQ_PRECHANGE) {
1605                 /* we should really shut the port down whilst the
1606                  * frequency change is in progress. */
1607
1608         } else if (val == CPUFREQ_POSTCHANGE) {
1609                 struct ktermios *termios;
1610                 struct tty_struct *tty;
1611
1612                 if (uport->state == NULL)
1613                         goto exit;
1614
1615                 tty = uport->state->port.tty;
1616
1617                 if (tty == NULL)
1618                         goto exit;
1619
1620                 termios = &tty->termios;
1621
1622                 if (termios == NULL) {
1623                         dev_warn(uport->dev, "%s: no termios?\n", __func__);
1624                         goto exit;
1625                 }
1626
1627                 s3c24xx_serial_set_termios(uport, termios, NULL);
1628         }
1629
1630 exit:
1631         return 0;
1632 }
1633
1634 static inline int
1635 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1636 {
1637         port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1638
1639         return cpufreq_register_notifier(&port->freq_transition,
1640                                          CPUFREQ_TRANSITION_NOTIFIER);
1641 }
1642
1643 static inline void
1644 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1645 {
1646         cpufreq_unregister_notifier(&port->freq_transition,
1647                                     CPUFREQ_TRANSITION_NOTIFIER);
1648 }
1649
1650 #else
1651 static inline int
1652 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1653 {
1654         return 0;
1655 }
1656
1657 static inline void
1658 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1659 {
1660 }
1661 #endif
1662
1663 /* s3c24xx_serial_init_port
1664  *
1665  * initialise a single serial port from the platform device given
1666  */
1667
1668 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1669                                     struct platform_device *platdev)
1670 {
1671         struct uart_port *port = &ourport->port;
1672         struct s3c2410_uartcfg *cfg = ourport->cfg;
1673         struct resource *res;
1674         int ret;
1675
1676         dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1677
1678         if (platdev == NULL)
1679                 return -ENODEV;
1680
1681         if (port->mapbase != 0)
1682                 return -EINVAL;
1683
1684         /* setup info for port */
1685         port->dev       = &platdev->dev;
1686
1687         /* Startup sequence is different for s3c64xx and higher SoC's */
1688         if (s3c24xx_serial_has_interrupt_mask(port))
1689                 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1690
1691         port->uartclk = 1;
1692
1693         if (cfg->uart_flags & UPF_CONS_FLOW) {
1694                 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1695                 port->flags |= UPF_CONS_FLOW;
1696         }
1697
1698         /* sort our the physical and virtual addresses for each UART */
1699
1700         res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1701         if (res == NULL) {
1702                 dev_err(port->dev, "failed to find memory resource for uart\n");
1703                 return -EINVAL;
1704         }
1705
1706         dbg("resource %pR)\n", res);
1707
1708         port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
1709         if (!port->membase) {
1710                 dev_err(port->dev, "failed to remap controller address\n");
1711                 return -EBUSY;
1712         }
1713
1714         port->mapbase = res->start;
1715         ret = platform_get_irq(platdev, 0);
1716         if (ret < 0)
1717                 port->irq = 0;
1718         else {
1719                 port->irq = ret;
1720                 ourport->rx_irq = ret;
1721                 ourport->tx_irq = ret + 1;
1722         }
1723
1724         ret = platform_get_irq(platdev, 1);
1725         if (ret > 0)
1726                 ourport->tx_irq = ret;
1727         /*
1728          * DMA is currently supported only on DT platforms, if DMA properties
1729          * are specified.
1730          */
1731         if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1732                                                      "dmas", NULL)) {
1733                 ourport->dma = devm_kzalloc(port->dev,
1734                                             sizeof(*ourport->dma),
1735                                             GFP_KERNEL);
1736                 if (!ourport->dma) {
1737                         ret = -ENOMEM;
1738                         goto err;
1739                 }
1740         }
1741
1742         ourport->clk    = clk_get(&platdev->dev, "uart");
1743         if (IS_ERR(ourport->clk)) {
1744                 pr_err("%s: Controller clock not found\n",
1745                                 dev_name(&platdev->dev));
1746                 ret = PTR_ERR(ourport->clk);
1747                 goto err;
1748         }
1749
1750         ret = clk_prepare_enable(ourport->clk);
1751         if (ret) {
1752                 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1753                 clk_put(ourport->clk);
1754                 goto err;
1755         }
1756
1757         /* Keep all interrupts masked and cleared */
1758         if (s3c24xx_serial_has_interrupt_mask(port)) {
1759                 wr_regl(port, S3C64XX_UINTM, 0xf);
1760                 wr_regl(port, S3C64XX_UINTP, 0xf);
1761                 wr_regl(port, S3C64XX_UINTSP, 0xf);
1762         }
1763
1764         dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1765             &port->mapbase, port->membase, port->irq,
1766             ourport->rx_irq, ourport->tx_irq, port->uartclk);
1767
1768         /* reset the fifos (and setup the uart) */
1769         s3c24xx_serial_resetport(port, cfg);
1770
1771         return 0;
1772
1773 err:
1774         port->mapbase = 0;
1775         return ret;
1776 }
1777
1778 /* Device driver serial port probe */
1779
1780 static const struct of_device_id s3c24xx_uart_dt_match[];
1781 static int probe_index;
1782
1783 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1784                         struct platform_device *pdev)
1785 {
1786 #ifdef CONFIG_OF
1787         if (pdev->dev.of_node) {
1788                 const struct of_device_id *match;
1789                 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1790                 return (struct s3c24xx_serial_drv_data *)match->data;
1791         }
1792 #endif
1793         return (struct s3c24xx_serial_drv_data *)
1794                         platform_get_device_id(pdev)->driver_data;
1795 }
1796
1797 static int s3c24xx_serial_probe(struct platform_device *pdev)
1798 {
1799         struct device_node *np = pdev->dev.of_node;
1800         struct s3c24xx_uart_port *ourport;
1801         int index = probe_index;
1802         int ret;
1803
1804         if (np) {
1805                 ret = of_alias_get_id(np, "serial");
1806                 if (ret >= 0)
1807                         index = ret;
1808         }
1809
1810         dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index);
1811
1812         ourport = &s3c24xx_serial_ports[index];
1813
1814         ourport->drv_data = s3c24xx_get_driver_data(pdev);
1815         if (!ourport->drv_data) {
1816                 dev_err(&pdev->dev, "could not find driver data\n");
1817                 return -ENODEV;
1818         }
1819
1820         ourport->baudclk = ERR_PTR(-EINVAL);
1821         ourport->info = ourport->drv_data->info;
1822         ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1823                         dev_get_platdata(&pdev->dev) :
1824                         ourport->drv_data->def_cfg;
1825
1826         if (np)
1827                 of_property_read_u32(np,
1828                         "samsung,uart-fifosize", &ourport->port.fifosize);
1829
1830         if (ourport->drv_data->fifosize[index])
1831                 ourport->port.fifosize = ourport->drv_data->fifosize[index];
1832         else if (ourport->info->fifosize)
1833                 ourport->port.fifosize = ourport->info->fifosize;
1834
1835         /*
1836          * DMA transfers must be aligned at least to cache line size,
1837          * so find minimal transfer size suitable for DMA mode
1838          */
1839         ourport->min_dma_size = max_t(int, ourport->port.fifosize,
1840                                     dma_get_cache_alignment());
1841
1842         dbg("%s: initialising port %p...\n", __func__, ourport);
1843
1844         ret = s3c24xx_serial_init_port(ourport, pdev);
1845         if (ret < 0)
1846                 return ret;
1847
1848         if (!s3c24xx_uart_drv.state) {
1849                 ret = uart_register_driver(&s3c24xx_uart_drv);
1850                 if (ret < 0) {
1851                         pr_err("Failed to register Samsung UART driver\n");
1852                         return ret;
1853                 }
1854         }
1855
1856         dbg("%s: adding port\n", __func__);
1857         uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1858         platform_set_drvdata(pdev, &ourport->port);
1859
1860         /*
1861          * Deactivate the clock enabled in s3c24xx_serial_init_port here,
1862          * so that a potential re-enablement through the pm-callback overlaps
1863          * and keeps the clock enabled in this case.
1864          */
1865         clk_disable_unprepare(ourport->clk);
1866
1867         ret = s3c24xx_serial_cpufreq_register(ourport);
1868         if (ret < 0)
1869                 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1870
1871         probe_index++;
1872
1873         return 0;
1874 }
1875
1876 static int s3c24xx_serial_remove(struct platform_device *dev)
1877 {
1878         struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1879
1880         if (port) {
1881                 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1882                 uart_remove_one_port(&s3c24xx_uart_drv, port);
1883         }
1884
1885         uart_unregister_driver(&s3c24xx_uart_drv);
1886
1887         return 0;
1888 }
1889
1890 /* UART power management code */
1891 #ifdef CONFIG_PM_SLEEP
1892 static int s3c24xx_serial_suspend(struct device *dev)
1893 {
1894         struct uart_port *port = s3c24xx_dev_to_port(dev);
1895
1896         if (port)
1897                 uart_suspend_port(&s3c24xx_uart_drv, port);
1898
1899         return 0;
1900 }
1901
1902 static int s3c24xx_serial_resume(struct device *dev)
1903 {
1904         struct uart_port *port = s3c24xx_dev_to_port(dev);
1905         struct s3c24xx_uart_port *ourport = to_ourport(port);
1906
1907         if (port) {
1908                 clk_prepare_enable(ourport->clk);
1909                 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1910                 clk_disable_unprepare(ourport->clk);
1911
1912                 uart_resume_port(&s3c24xx_uart_drv, port);
1913         }
1914
1915         return 0;
1916 }
1917
1918 static int s3c24xx_serial_resume_noirq(struct device *dev)
1919 {
1920         struct uart_port *port = s3c24xx_dev_to_port(dev);
1921         struct s3c24xx_uart_port *ourport = to_ourport(port);
1922
1923         if (port) {
1924                 /* restore IRQ mask */
1925                 if (s3c24xx_serial_has_interrupt_mask(port)) {
1926                         unsigned int uintm = 0xf;
1927                         if (tx_enabled(port))
1928                                 uintm &= ~S3C64XX_UINTM_TXD_MSK;
1929                         if (rx_enabled(port))
1930                                 uintm &= ~S3C64XX_UINTM_RXD_MSK;
1931                         clk_prepare_enable(ourport->clk);
1932                         wr_regl(port, S3C64XX_UINTM, uintm);
1933                         clk_disable_unprepare(ourport->clk);
1934                 }
1935         }
1936
1937         return 0;
1938 }
1939
1940 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1941         .suspend = s3c24xx_serial_suspend,
1942         .resume = s3c24xx_serial_resume,
1943         .resume_noirq = s3c24xx_serial_resume_noirq,
1944 };
1945 #define SERIAL_SAMSUNG_PM_OPS   (&s3c24xx_serial_pm_ops)
1946
1947 #else /* !CONFIG_PM_SLEEP */
1948
1949 #define SERIAL_SAMSUNG_PM_OPS   NULL
1950 #endif /* CONFIG_PM_SLEEP */
1951
1952 /* Console code */
1953
1954 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1955
1956 static struct uart_port *cons_uart;
1957
1958 static int
1959 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1960 {
1961         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1962         unsigned long ufstat, utrstat;
1963
1964         if (ufcon & S3C2410_UFCON_FIFOMODE) {
1965                 /* fifo mode - check amount of data in fifo registers... */
1966
1967                 ufstat = rd_regl(port, S3C2410_UFSTAT);
1968                 return (ufstat & info->tx_fifofull) ? 0 : 1;
1969         }
1970
1971         /* in non-fifo mode, we go and use the tx buffer empty */
1972
1973         utrstat = rd_regl(port, S3C2410_UTRSTAT);
1974         return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1975 }
1976
1977 static bool
1978 s3c24xx_port_configured(unsigned int ucon)
1979 {
1980         /* consider the serial port configured if the tx/rx mode set */
1981         return (ucon & 0xf) != 0;
1982 }
1983
1984 #ifdef CONFIG_CONSOLE_POLL
1985 /*
1986  * Console polling routines for writing and reading from the uart while
1987  * in an interrupt or debug context.
1988  */
1989
1990 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
1991 {
1992         struct s3c24xx_uart_port *ourport = to_ourport(port);
1993         unsigned int ufstat;
1994
1995         ufstat = rd_regl(port, S3C2410_UFSTAT);
1996         if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
1997                 return NO_POLL_CHAR;
1998
1999         return rd_regb(port, S3C2410_URXH);
2000 }
2001
2002 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
2003                 unsigned char c)
2004 {
2005         unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2006         unsigned int ucon = rd_regl(port, S3C2410_UCON);
2007
2008         /* not possible to xmit on unconfigured port */
2009         if (!s3c24xx_port_configured(ucon))
2010                 return;
2011
2012         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2013                 cpu_relax();
2014         wr_regb(port, S3C2410_UTXH, c);
2015 }
2016
2017 #endif /* CONFIG_CONSOLE_POLL */
2018
2019 static void
2020 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
2021 {
2022         unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2023
2024         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2025                 cpu_relax();
2026         wr_regb(port, S3C2410_UTXH, ch);
2027 }
2028
2029 static void
2030 s3c24xx_serial_console_write(struct console *co, const char *s,
2031                              unsigned int count)
2032 {
2033         unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
2034
2035         /* not possible to xmit on unconfigured port */
2036         if (!s3c24xx_port_configured(ucon))
2037                 return;
2038
2039         uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2040 }
2041
2042 static void __init
2043 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2044                            int *parity, int *bits)
2045 {
2046         struct clk *clk;
2047         unsigned int ulcon;
2048         unsigned int ucon;
2049         unsigned int ubrdiv;
2050         unsigned long rate;
2051         unsigned int clk_sel;
2052         char clk_name[MAX_CLK_NAME_LENGTH];
2053
2054         ulcon  = rd_regl(port, S3C2410_ULCON);
2055         ucon   = rd_regl(port, S3C2410_UCON);
2056         ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2057
2058         dbg("s3c24xx_serial_get_options: port=%p\n"
2059             "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
2060             port, ulcon, ucon, ubrdiv);
2061
2062         if (s3c24xx_port_configured(ucon)) {
2063                 switch (ulcon & S3C2410_LCON_CSMASK) {
2064                 case S3C2410_LCON_CS5:
2065                         *bits = 5;
2066                         break;
2067                 case S3C2410_LCON_CS6:
2068                         *bits = 6;
2069                         break;
2070                 case S3C2410_LCON_CS7:
2071                         *bits = 7;
2072                         break;
2073                 case S3C2410_LCON_CS8:
2074                 default:
2075                         *bits = 8;
2076                         break;
2077                 }
2078
2079                 switch (ulcon & S3C2410_LCON_PMASK) {
2080                 case S3C2410_LCON_PEVEN:
2081                         *parity = 'e';
2082                         break;
2083
2084                 case S3C2410_LCON_PODD:
2085                         *parity = 'o';
2086                         break;
2087
2088                 case S3C2410_LCON_PNONE:
2089                 default:
2090                         *parity = 'n';
2091                 }
2092
2093                 /* now calculate the baud rate */
2094
2095                 clk_sel = s3c24xx_serial_getsource(port);
2096                 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2097
2098                 clk = clk_get(port->dev, clk_name);
2099                 if (!IS_ERR(clk))
2100                         rate = clk_get_rate(clk);
2101                 else
2102                         rate = 1;
2103
2104                 *baud = rate / (16 * (ubrdiv + 1));
2105                 dbg("calculated baud %d\n", *baud);
2106         }
2107
2108 }
2109
2110 static int __init
2111 s3c24xx_serial_console_setup(struct console *co, char *options)
2112 {
2113         struct uart_port *port;
2114         int baud = 9600;
2115         int bits = 8;
2116         int parity = 'n';
2117         int flow = 'n';
2118
2119         dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
2120             co, co->index, options);
2121
2122         /* is this a valid port */
2123
2124         if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
2125                 co->index = 0;
2126
2127         port = &s3c24xx_serial_ports[co->index].port;
2128
2129         /* is the port configured? */
2130
2131         if (port->mapbase == 0x0)
2132                 return -ENODEV;
2133
2134         cons_uart = port;
2135
2136         dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
2137
2138         /*
2139          * Check whether an invalid uart number has been specified, and
2140          * if so, search for the first available port that does have
2141          * console support.
2142          */
2143         if (options)
2144                 uart_parse_options(options, &baud, &parity, &bits, &flow);
2145         else
2146                 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2147
2148         dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
2149
2150         return uart_set_options(port, co, baud, parity, bits, flow);
2151 }
2152
2153 static struct console s3c24xx_serial_console = {
2154         .name           = S3C24XX_SERIAL_NAME,
2155         .device         = uart_console_device,
2156         .flags          = CON_PRINTBUFFER,
2157         .index          = -1,
2158         .write          = s3c24xx_serial_console_write,
2159         .setup          = s3c24xx_serial_console_setup,
2160         .data           = &s3c24xx_uart_drv,
2161 };
2162 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2163
2164 #ifdef CONFIG_CPU_S3C2410
2165 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
2166         .info = &(struct s3c24xx_uart_info) {
2167                 .name           = "Samsung S3C2410 UART",
2168                 .type           = PORT_S3C2410,
2169                 .fifosize       = 16,
2170                 .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
2171                 .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
2172                 .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
2173                 .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
2174                 .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
2175                 .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
2176                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2177                 .num_clks       = 2,
2178                 .clksel_mask    = S3C2410_UCON_CLKMASK,
2179                 .clksel_shift   = S3C2410_UCON_CLKSHIFT,
2180         },
2181         .def_cfg = &(struct s3c2410_uartcfg) {
2182                 .ucon           = S3C2410_UCON_DEFAULT,
2183                 .ufcon          = S3C2410_UFCON_DEFAULT,
2184         },
2185 };
2186 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
2187 #else
2188 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2189 #endif
2190
2191 #ifdef CONFIG_CPU_S3C2412
2192 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
2193         .info = &(struct s3c24xx_uart_info) {
2194                 .name           = "Samsung S3C2412 UART",
2195                 .type           = PORT_S3C2412,
2196                 .fifosize       = 64,
2197                 .has_divslot    = 1,
2198                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2199                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2200                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2201                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2202                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2203                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2204                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2205                 .num_clks       = 4,
2206                 .clksel_mask    = S3C2412_UCON_CLKMASK,
2207                 .clksel_shift   = S3C2412_UCON_CLKSHIFT,
2208         },
2209         .def_cfg = &(struct s3c2410_uartcfg) {
2210                 .ucon           = S3C2410_UCON_DEFAULT,
2211                 .ufcon          = S3C2410_UFCON_DEFAULT,
2212         },
2213 };
2214 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
2215 #else
2216 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2217 #endif
2218
2219 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
2220         defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
2221 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
2222         .info = &(struct s3c24xx_uart_info) {
2223                 .name           = "Samsung S3C2440 UART",
2224                 .type           = PORT_S3C2440,
2225                 .fifosize       = 64,
2226                 .has_divslot    = 1,
2227                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2228                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2229                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2230                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2231                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2232                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2233                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2234                 .num_clks       = 4,
2235                 .clksel_mask    = S3C2412_UCON_CLKMASK,
2236                 .clksel_shift   = S3C2412_UCON_CLKSHIFT,
2237         },
2238         .def_cfg = &(struct s3c2410_uartcfg) {
2239                 .ucon           = S3C2410_UCON_DEFAULT,
2240                 .ufcon          = S3C2410_UFCON_DEFAULT,
2241         },
2242 };
2243 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
2244 #else
2245 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2246 #endif
2247
2248 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2249 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2250         .info = &(struct s3c24xx_uart_info) {
2251                 .name           = "Samsung S3C6400 UART",
2252                 .type           = PORT_S3C6400,
2253                 .fifosize       = 64,
2254                 .has_divslot    = 1,
2255                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2256                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2257                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2258                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2259                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2260                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2261                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2262                 .num_clks       = 4,
2263                 .clksel_mask    = S3C6400_UCON_CLKMASK,
2264                 .clksel_shift   = S3C6400_UCON_CLKSHIFT,
2265         },
2266         .def_cfg = &(struct s3c2410_uartcfg) {
2267                 .ucon           = S3C2410_UCON_DEFAULT,
2268                 .ufcon          = S3C2410_UFCON_DEFAULT,
2269         },
2270 };
2271 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
2272 #else
2273 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2274 #endif
2275
2276 #ifdef CONFIG_CPU_S5PV210
2277 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2278         .info = &(struct s3c24xx_uart_info) {
2279                 .name           = "Samsung S5PV210 UART",
2280                 .type           = PORT_S3C6400,
2281                 .has_divslot    = 1,
2282                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,
2283                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,
2284                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,
2285                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,
2286                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,
2287                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,
2288                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2289                 .num_clks       = 2,
2290                 .clksel_mask    = S5PV210_UCON_CLKMASK,
2291                 .clksel_shift   = S5PV210_UCON_CLKSHIFT,
2292         },
2293         .def_cfg = &(struct s3c2410_uartcfg) {
2294                 .ucon           = S5PV210_UCON_DEFAULT,
2295                 .ufcon          = S5PV210_UFCON_DEFAULT,
2296         },
2297         .fifosize = { 256, 64, 16, 16 },
2298 };
2299 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
2300 #else
2301 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2302 #endif
2303
2304 #if defined(CONFIG_ARCH_EXYNOS)
2305 #define EXYNOS_COMMON_SERIAL_DRV_DATA                           \
2306         .info = &(struct s3c24xx_uart_info) {                   \
2307                 .name           = "Samsung Exynos UART",        \
2308                 .type           = PORT_S3C6400,                 \
2309                 .has_divslot    = 1,                            \
2310                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
2311                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
2312                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
2313                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
2314                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
2315                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
2316                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,         \
2317                 .num_clks       = 1,                            \
2318                 .clksel_mask    = 0,                            \
2319                 .clksel_shift   = 0,                            \
2320         },                                                      \
2321         .def_cfg = &(struct s3c2410_uartcfg) {                  \
2322                 .ucon           = S5PV210_UCON_DEFAULT,         \
2323                 .ufcon          = S5PV210_UFCON_DEFAULT,        \
2324                 .has_fracval    = 1,                            \
2325         }                                                       \
2326
2327 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2328         EXYNOS_COMMON_SERIAL_DRV_DATA,
2329         .fifosize = { 256, 64, 16, 16 },
2330 };
2331
2332 static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2333         EXYNOS_COMMON_SERIAL_DRV_DATA,
2334         .fifosize = { 64, 256, 16, 256 },
2335 };
2336
2337 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
2338 #define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
2339 #else
2340 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2341 #define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2342 #endif
2343
2344 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
2345         {
2346                 .name           = "s3c2410-uart",
2347                 .driver_data    = S3C2410_SERIAL_DRV_DATA,
2348         }, {
2349                 .name           = "s3c2412-uart",
2350                 .driver_data    = S3C2412_SERIAL_DRV_DATA,
2351         }, {
2352                 .name           = "s3c2440-uart",
2353                 .driver_data    = S3C2440_SERIAL_DRV_DATA,
2354         }, {
2355                 .name           = "s3c6400-uart",
2356                 .driver_data    = S3C6400_SERIAL_DRV_DATA,
2357         }, {
2358                 .name           = "s5pv210-uart",
2359                 .driver_data    = S5PV210_SERIAL_DRV_DATA,
2360         }, {
2361                 .name           = "exynos4210-uart",
2362                 .driver_data    = EXYNOS4210_SERIAL_DRV_DATA,
2363         }, {
2364                 .name           = "exynos5433-uart",
2365                 .driver_data    = EXYNOS5433_SERIAL_DRV_DATA,
2366         },
2367         { },
2368 };
2369 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2370
2371 #ifdef CONFIG_OF
2372 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2373         { .compatible = "samsung,s3c2410-uart",
2374                 .data = (void *)S3C2410_SERIAL_DRV_DATA },
2375         { .compatible = "samsung,s3c2412-uart",
2376                 .data = (void *)S3C2412_SERIAL_DRV_DATA },
2377         { .compatible = "samsung,s3c2440-uart",
2378                 .data = (void *)S3C2440_SERIAL_DRV_DATA },
2379         { .compatible = "samsung,s3c6400-uart",
2380                 .data = (void *)S3C6400_SERIAL_DRV_DATA },
2381         { .compatible = "samsung,s5pv210-uart",
2382                 .data = (void *)S5PV210_SERIAL_DRV_DATA },
2383         { .compatible = "samsung,exynos4210-uart",
2384                 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
2385         { .compatible = "samsung,exynos5433-uart",
2386                 .data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
2387         {},
2388 };
2389 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2390 #endif
2391
2392 static struct platform_driver samsung_serial_driver = {
2393         .probe          = s3c24xx_serial_probe,
2394         .remove         = s3c24xx_serial_remove,
2395         .id_table       = s3c24xx_serial_driver_ids,
2396         .driver         = {
2397                 .name   = "samsung-uart",
2398                 .pm     = SERIAL_SAMSUNG_PM_OPS,
2399                 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2400         },
2401 };
2402
2403 module_platform_driver(samsung_serial_driver);
2404
2405 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2406 /*
2407  * Early console.
2408  */
2409
2410 struct samsung_early_console_data {
2411         u32 txfull_mask;
2412 };
2413
2414 static void samsung_early_busyuart(struct uart_port *port)
2415 {
2416         while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2417                 ;
2418 }
2419
2420 static void samsung_early_busyuart_fifo(struct uart_port *port)
2421 {
2422         struct samsung_early_console_data *data = port->private_data;
2423
2424         while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2425                 ;
2426 }
2427
2428 static void samsung_early_putc(struct uart_port *port, int c)
2429 {
2430         if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2431                 samsung_early_busyuart_fifo(port);
2432         else
2433                 samsung_early_busyuart(port);
2434
2435         writeb(c, port->membase + S3C2410_UTXH);
2436 }
2437
2438 static void samsung_early_write(struct console *con, const char *s, unsigned n)
2439 {
2440         struct earlycon_device *dev = con->data;
2441
2442         uart_console_write(&dev->port, s, n, samsung_early_putc);
2443 }
2444
2445 static int __init samsung_early_console_setup(struct earlycon_device *device,
2446                                               const char *opt)
2447 {
2448         if (!device->port.membase)
2449                 return -ENODEV;
2450
2451         device->con->write = samsung_early_write;
2452         return 0;
2453 }
2454
2455 /* S3C2410 */
2456 static struct samsung_early_console_data s3c2410_early_console_data = {
2457         .txfull_mask = S3C2410_UFSTAT_TXFULL,
2458 };
2459
2460 static int __init s3c2410_early_console_setup(struct earlycon_device *device,
2461                                               const char *opt)
2462 {
2463         device->port.private_data = &s3c2410_early_console_data;
2464         return samsung_early_console_setup(device, opt);
2465 }
2466 OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
2467                         s3c2410_early_console_setup);
2468
2469 /* S3C2412, S3C2440, S3C64xx */
2470 static struct samsung_early_console_data s3c2440_early_console_data = {
2471         .txfull_mask = S3C2440_UFSTAT_TXFULL,
2472 };
2473
2474 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2475                                               const char *opt)
2476 {
2477         device->port.private_data = &s3c2440_early_console_data;
2478         return samsung_early_console_setup(device, opt);
2479 }
2480 OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
2481                         s3c2440_early_console_setup);
2482 OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
2483                         s3c2440_early_console_setup);
2484 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2485                         s3c2440_early_console_setup);
2486
2487 /* S5PV210, EXYNOS */
2488 static struct samsung_early_console_data s5pv210_early_console_data = {
2489         .txfull_mask = S5PV210_UFSTAT_TXFULL,
2490 };
2491
2492 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2493                                               const char *opt)
2494 {
2495         device->port.private_data = &s5pv210_early_console_data;
2496         return samsung_early_console_setup(device, opt);
2497 }
2498 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2499                         s5pv210_early_console_setup);
2500 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2501                         s5pv210_early_console_setup);
2502 #endif
2503
2504 MODULE_ALIAS("platform:samsung-uart");
2505 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2506 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
2507 MODULE_LICENSE("GPL v2");