drivers/tty/serial/samsung.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver core for Samsung SoC onboard UARTs.
   4  *
   5  * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
   6  *      http://armlinux.simtec.co.uk/
   7 */
   8
   9 /* Hote on 2410 error handling
  10  *
  11  * The s3c2410 manual has a love/hate affair with the contents of the
  12  * UERSTAT register in the UART blocks, and keeps marking some of the
  13  * error bits as reserved. Having checked with the s3c2410x01,
  14  * it copes with BREAKs properly, so I am happy to ignore the RESERVED
  15  * feature from the latter versions of the manual.
  16  *
  17  * If it becomes aparrent that latter versions of the 2410 remove these
  18  * bits, then action will have to be taken to differentiate the versions
  19  * and change the policy on BREAK
  20  *
  21  * BJD, 04-Nov-2004
  22 */
  23
  24 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  25 #define SUPPORT_SYSRQ
  26 #endif
  27
  28 #include <linux/dmaengine.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/slab.h>
  31 #include <linux/module.h>
  32 #include <linux/ioport.h>
  33 #include <linux/io.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/init.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/console.h>
  38 #include <linux/tty.h>
  39 #include <linux/tty_flip.h>
  40 #include <linux/serial_core.h>
  41 #include <linux/serial.h>
  42 #include <linux/serial_s3c.h>
  43 #include <linux/delay.h>
  44 #include <linux/clk.h>
  45 #include <linux/cpufreq.h>
  46 #include <linux/of.h>
  47
  48 #include <asm/irq.h>
  49
  50 #include "samsung.h"
  51
  52 #if     defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \
  53         !defined(MODULE)
  54
  55 extern void printascii(const char *);
  56
  57 __printf(1, 2)
  58 static void dbg(const char *fmt, ...)
  59 {
  60         va_list va;
  61         char buff[256];
  62
  63         va_start(va, fmt);
  64         vscnprintf(buff, sizeof(buff), fmt, va);
  65         va_end(va);
  66
  67         printascii(buff);
  68 }
  69
  70 #else
  71 #define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0)
  72 #endif
  73
  74 /* UART name and device definitions */
  75
  76 #define S3C24XX_SERIAL_NAME     "ttySAC"
  77 #define S3C24XX_SERIAL_MAJOR    204
  78 #define S3C24XX_SERIAL_MINOR    64
  79
  80 #define S3C24XX_TX_PIO                  1
  81 #define S3C24XX_TX_DMA                  2
  82 #define S3C24XX_RX_PIO                  1
  83 #define S3C24XX_RX_DMA                  2
  84 /* macros to change one thing to another */
  85
  86 #define tx_enabled(port) ((port)->unused[0])
  87 #define rx_enabled(port) ((port)->unused[1])
  88
  89 /* flag to ignore all characters coming in */
  90 #define RXSTAT_DUMMY_READ (0x10000000)
  91
  92 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
  93 {
  94         return container_of(port, struct s3c24xx_uart_port, port);
  95 }
  96
  97 /* translate a port to the device name */
  98
  99 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
 100 {
 101         return to_platform_device(port->dev)->name;
 102 }
 103
 104 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
 105 {
 106         return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
 107 }
 108
 109 /*
 110  * s3c64xx and later SoC's include the interrupt mask and status registers in
 111  * the controller itself, unlike the s3c24xx SoC's which have these registers
 112  * in the interrupt controller. Check if the port type is s3c64xx or higher.
 113  */
 114 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
 115 {
 116         return to_ourport(port)->info->type == PORT_S3C6400;
 117 }
 118
 119 static void s3c24xx_serial_rx_enable(struct uart_port *port)
 120 {
 121         unsigned long flags;
 122         unsigned int ucon, ufcon;
 123         int count = 10000;
 124
 125         spin_lock_irqsave(&port->lock, flags);
 126
 127         while (--count && !s3c24xx_serial_txempty_nofifo(port))
 128                 udelay(100);
 129
 130         ufcon = rd_regl(port, S3C2410_UFCON);
 131         ufcon |= S3C2410_UFCON_RESETRX;
 132         wr_regl(port, S3C2410_UFCON, ufcon);
 133
 134         ucon = rd_regl(port, S3C2410_UCON);
 135         ucon |= S3C2410_UCON_RXIRQMODE;
 136         wr_regl(port, S3C2410_UCON, ucon);
 137
 138         rx_enabled(port) = 1;
 139         spin_unlock_irqrestore(&port->lock, flags);
 140 }
 141
 142 static void s3c24xx_serial_rx_disable(struct uart_port *port)
 143 {
 144         unsigned long flags;
 145         unsigned int ucon;
 146
 147         spin_lock_irqsave(&port->lock, flags);
 148
 149         ucon = rd_regl(port, S3C2410_UCON);
 150         ucon &= ~S3C2410_UCON_RXIRQMODE;
 151         wr_regl(port, S3C2410_UCON, ucon);
 152
 153         rx_enabled(port) = 0;
 154         spin_unlock_irqrestore(&port->lock, flags);
 155 }
 156
 157 static void s3c24xx_serial_stop_tx(struct uart_port *port)
 158 {
 159         struct s3c24xx_uart_port *ourport = to_ourport(port);
 160         struct s3c24xx_uart_dma *dma = ourport->dma;
 161         struct circ_buf *xmit = &port->state->xmit;
 162         struct dma_tx_state state;
 163         int count;
 164
 165         if (!tx_enabled(port))
 166                 return;
 167
 168         if (s3c24xx_serial_has_interrupt_mask(port))
 169                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 170         else
 171                 disable_irq_nosync(ourport->tx_irq);
 172
 173         if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
 174                 dmaengine_pause(dma->tx_chan);
 175                 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 176                 dmaengine_terminate_all(dma->tx_chan);
 177                 dma_sync_single_for_cpu(ourport->port.dev,
 178                         dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
 179                 async_tx_ack(dma->tx_desc);
 180                 count = dma->tx_bytes_requested - state.residue;
 181                 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
 182                 port->icount.tx += count;
 183         }
 184
 185         tx_enabled(port) = 0;
 186         ourport->tx_in_progress = 0;
 187
 188         if (port->flags & UPF_CONS_FLOW)
 189                 s3c24xx_serial_rx_enable(port);
 190
 191         ourport->tx_mode = 0;
 192 }
 193
 194 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
 195
 196 static void s3c24xx_serial_tx_dma_complete(void *args)
 197 {
 198         struct s3c24xx_uart_port *ourport = args;
 199         struct uart_port *port = &ourport->port;
 200         struct circ_buf *xmit = &port->state->xmit;
 201         struct s3c24xx_uart_dma *dma = ourport->dma;
 202         struct dma_tx_state state;
 203         unsigned long flags;
 204         int count;
 205
 206
 207         dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 208         count = dma->tx_bytes_requested - state.residue;
 209         async_tx_ack(dma->tx_desc);
 210
 211         dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
 212                                 dma->tx_size, DMA_TO_DEVICE);
 213
 214         spin_lock_irqsave(&port->lock, flags);
 215
 216         xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
 217         port->icount.tx += count;
 218         ourport->tx_in_progress = 0;
 219
 220         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 221                 uart_write_wakeup(port);
 222
 223         s3c24xx_serial_start_next_tx(ourport);
 224         spin_unlock_irqrestore(&port->lock, flags);
 225 }
 226
 227 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
 228 {
 229         struct uart_port *port = &ourport->port;
 230         u32 ucon;
 231
 232         /* Mask Tx interrupt */
 233         if (s3c24xx_serial_has_interrupt_mask(port))
 234                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 235         else
 236                 disable_irq_nosync(ourport->tx_irq);
 237
 238         /* Enable tx dma mode */
 239         ucon = rd_regl(port, S3C2410_UCON);
 240         ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
 241         ucon |= (dma_get_cache_alignment() >= 16) ?
 242                 S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
 243         ucon |= S3C64XX_UCON_TXMODE_DMA;
 244         wr_regl(port,  S3C2410_UCON, ucon);
 245
 246         ourport->tx_mode = S3C24XX_TX_DMA;
 247 }
 248
 249 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
 250 {
 251         struct uart_port *port = &ourport->port;
 252         u32 ucon, ufcon;
 253
 254         /* Set ufcon txtrig */
 255         ourport->tx_in_progress = S3C24XX_TX_PIO;
 256         ufcon = rd_regl(port, S3C2410_UFCON);
 257         wr_regl(port,  S3C2410_UFCON, ufcon);
 258
 259         /* Enable tx pio mode */
 260         ucon = rd_regl(port, S3C2410_UCON);
 261         ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
 262         ucon |= S3C64XX_UCON_TXMODE_CPU;
 263         wr_regl(port,  S3C2410_UCON, ucon);
 264
 265         /* Unmask Tx interrupt */
 266         if (s3c24xx_serial_has_interrupt_mask(port))
 267                 s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
 268                                   S3C64XX_UINTM);
 269         else
 270                 enable_irq(ourport->tx_irq);
 271
 272         ourport->tx_mode = S3C24XX_TX_PIO;
 273 }
 274
 275 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
 276 {
 277         if (ourport->tx_mode != S3C24XX_TX_PIO)
 278                 enable_tx_pio(ourport);
 279 }
 280
 281 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
 282                                       unsigned int count)
 283 {
 284         struct uart_port *port = &ourport->port;
 285         struct circ_buf *xmit = &port->state->xmit;
 286         struct s3c24xx_uart_dma *dma = ourport->dma;
 287
 288
 289         if (ourport->tx_mode != S3C24XX_TX_DMA)
 290                 enable_tx_dma(ourport);
 291
 292         dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
 293         dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
 294
 295         dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
 296                                 dma->tx_size, DMA_TO_DEVICE);
 297
 298         dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
 299                                 dma->tx_transfer_addr, dma->tx_size,
 300                                 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
 301         if (!dma->tx_desc) {
 302                 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
 303                 return -EIO;
 304         }
 305
 306         dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
 307         dma->tx_desc->callback_param = ourport;
 308         dma->tx_bytes_requested = dma->tx_size;
 309
 310         ourport->tx_in_progress = S3C24XX_TX_DMA;
 311         dma->tx_cookie = dmaengine_submit(dma->tx_desc);
 312         dma_async_issue_pending(dma->tx_chan);
 313         return 0;
 314 }
 315
 316 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
 317 {
 318         struct uart_port *port = &ourport->port;
 319         struct circ_buf *xmit = &port->state->xmit;
 320         unsigned long count;
 321
 322         /* Get data size up to the end of buffer */
 323         count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 324
 325         if (!count) {
 326                 s3c24xx_serial_stop_tx(port);
 327                 return;
 328         }
 329
 330         if (!ourport->dma || !ourport->dma->tx_chan ||
 331             count < ourport->min_dma_size ||
 332             xmit->tail & (dma_get_cache_alignment() - 1))
 333                 s3c24xx_serial_start_tx_pio(ourport);
 334         else
 335                 s3c24xx_serial_start_tx_dma(ourport, count);
 336 }
 337
 338 static void s3c24xx_serial_start_tx(struct uart_port *port)
 339 {
 340         struct s3c24xx_uart_port *ourport = to_ourport(port);
 341         struct circ_buf *xmit = &port->state->xmit;
 342
 343         if (!tx_enabled(port)) {
 344                 if (port->flags & UPF_CONS_FLOW)
 345                         s3c24xx_serial_rx_disable(port);
 346
 347                 tx_enabled(port) = 1;
 348                 if (!ourport->dma || !ourport->dma->tx_chan)
 349                         s3c24xx_serial_start_tx_pio(ourport);
 350         }
 351
 352         if (ourport->dma && ourport->dma->tx_chan) {
 353                 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
 354                         s3c24xx_serial_start_next_tx(ourport);
 355         }
 356 }
 357
 358 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
 359                 struct tty_port *tty, int count)
 360 {
 361         struct s3c24xx_uart_dma *dma = ourport->dma;
 362         int copied;
 363
 364         if (!count)
 365                 return;
 366
 367         dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
 368                                 dma->rx_size, DMA_FROM_DEVICE);
 369
 370         ourport->port.icount.rx += count;
 371         if (!tty) {
 372                 dev_err(ourport->port.dev, "No tty port\n");
 373                 return;
 374         }
 375         copied = tty_insert_flip_string(tty,
 376                         ((unsigned char *)(ourport->dma->rx_buf)), count);
 377         if (copied != count) {
 378                 WARN_ON(1);
 379                 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
 380         }
 381 }
 382
 383 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 384 {
 385         struct s3c24xx_uart_port *ourport = to_ourport(port);
 386         struct s3c24xx_uart_dma *dma = ourport->dma;
 387         struct tty_port *t = &port->state->port;
 388         struct dma_tx_state state;
 389         enum dma_status dma_status;
 390         unsigned int received;
 391
 392         if (rx_enabled(port)) {
 393                 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
 394                 if (s3c24xx_serial_has_interrupt_mask(port))
 395                         s3c24xx_set_bit(port, S3C64XX_UINTM_RXD,
 396                                         S3C64XX_UINTM);
 397                 else
 398                         disable_irq_nosync(ourport->rx_irq);
 399                 rx_enabled(port) = 0;
 400         }
 401         if (dma && dma->rx_chan) {
 402                 dmaengine_pause(dma->tx_chan);
 403                 dma_status = dmaengine_tx_status(dma->rx_chan,
 404                                 dma->rx_cookie, &state);
 405                 if (dma_status == DMA_IN_PROGRESS ||
 406                         dma_status == DMA_PAUSED) {
 407                         received = dma->rx_bytes_requested - state.residue;
 408                         dmaengine_terminate_all(dma->rx_chan);
 409                         s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 410                 }
 411         }
 412 }
 413
 414 static inline struct s3c24xx_uart_info
 415         *s3c24xx_port_to_info(struct uart_port *port)
 416 {
 417         return to_ourport(port)->info;
 418 }
 419
 420 static inline struct s3c2410_uartcfg
 421         *s3c24xx_port_to_cfg(struct uart_port *port)
 422 {
 423         struct s3c24xx_uart_port *ourport;
 424
 425         if (port->dev == NULL)
 426                 return NULL;
 427
 428         ourport = container_of(port, struct s3c24xx_uart_port, port);
 429         return ourport->cfg;
 430 }
 431
 432 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
 433                                      unsigned long ufstat)
 434 {
 435         struct s3c24xx_uart_info *info = ourport->info;
 436
 437         if (ufstat & info->rx_fifofull)
 438                 return ourport->port.fifosize;
 439
 440         return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
 441 }
 442
 443 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
 444 static void s3c24xx_serial_rx_dma_complete(void *args)
 445 {
 446         struct s3c24xx_uart_port *ourport = args;
 447         struct uart_port *port = &ourport->port;
 448
 449         struct s3c24xx_uart_dma *dma = ourport->dma;
 450         struct tty_port *t = &port->state->port;
 451         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 452
 453         struct dma_tx_state state;
 454         unsigned long flags;
 455         int received;
 456
 457         dmaengine_tx_status(dma->rx_chan,  dma->rx_cookie, &state);
 458         received  = dma->rx_bytes_requested - state.residue;
 459         async_tx_ack(dma->rx_desc);
 460
 461         spin_lock_irqsave(&port->lock, flags);
 462
 463         if (received)
 464                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 465
 466         if (tty) {
 467                 tty_flip_buffer_push(t);
 468                 tty_kref_put(tty);
 469         }
 470
 471         s3c64xx_start_rx_dma(ourport);
 472
 473         spin_unlock_irqrestore(&port->lock, flags);
 474 }
 475
 476 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
 477 {
 478         struct s3c24xx_uart_dma *dma = ourport->dma;
 479
 480         dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
 481                                 dma->rx_size, DMA_FROM_DEVICE);
 482
 483         dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
 484                                 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
 485                                 DMA_PREP_INTERRUPT);
 486         if (!dma->rx_desc) {
 487                 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
 488                 return;
 489         }
 490
 491         dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
 492         dma->rx_desc->callback_param = ourport;
 493         dma->rx_bytes_requested = dma->rx_size;
 494
 495         dma->rx_cookie = dmaengine_submit(dma->rx_desc);
 496         dma_async_issue_pending(dma->rx_chan);
 497 }
 498
 499 /* ? - where has parity gone?? */
 500 #define S3C2410_UERSTAT_PARITY (0x1000)
 501
 502 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
 503 {
 504         struct uart_port *port = &ourport->port;
 505         unsigned int ucon;
 506
 507         /* set Rx mode to DMA mode */
 508         ucon = rd_regl(port, S3C2410_UCON);
 509         ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
 510                         S3C64XX_UCON_TIMEOUT_MASK |
 511                         S3C64XX_UCON_EMPTYINT_EN |
 512                         S3C64XX_UCON_DMASUS_EN |
 513                         S3C64XX_UCON_TIMEOUT_EN |
 514                         S3C64XX_UCON_RXMODE_MASK);
 515         ucon |= S3C64XX_UCON_RXBURST_16 |
 516                         0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 517                         S3C64XX_UCON_EMPTYINT_EN |
 518                         S3C64XX_UCON_TIMEOUT_EN |
 519                         S3C64XX_UCON_RXMODE_DMA;
 520         wr_regl(port, S3C2410_UCON, ucon);
 521
 522         ourport->rx_mode = S3C24XX_RX_DMA;
 523 }
 524
 525 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
 526 {
 527         struct uart_port *port = &ourport->port;
 528         unsigned int ucon;
 529
 530         /* set Rx mode to DMA mode */
 531         ucon = rd_regl(port, S3C2410_UCON);
 532         ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
 533                         S3C64XX_UCON_EMPTYINT_EN |
 534                         S3C64XX_UCON_DMASUS_EN |
 535                         S3C64XX_UCON_TIMEOUT_EN |
 536                         S3C64XX_UCON_RXMODE_MASK);
 537         ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 538                         S3C64XX_UCON_TIMEOUT_EN |
 539                         S3C64XX_UCON_RXMODE_CPU;
 540         wr_regl(port, S3C2410_UCON, ucon);
 541
 542         ourport->rx_mode = S3C24XX_RX_PIO;
 543 }
 544
 545 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
 546
 547 static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
 548 {
 549         unsigned int utrstat, ufstat, received;
 550         struct s3c24xx_uart_port *ourport = dev_id;
 551         struct uart_port *port = &ourport->port;
 552         struct s3c24xx_uart_dma *dma = ourport->dma;
 553         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 554         struct tty_port *t = &port->state->port;
 555         unsigned long flags;
 556         struct dma_tx_state state;
 557
 558         utrstat = rd_regl(port, S3C2410_UTRSTAT);
 559         ufstat = rd_regl(port, S3C2410_UFSTAT);
 560
 561         spin_lock_irqsave(&port->lock, flags);
 562
 563         if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
 564                 s3c64xx_start_rx_dma(ourport);
 565                 if (ourport->rx_mode == S3C24XX_RX_PIO)
 566                         enable_rx_dma(ourport);
 567                 goto finish;
 568         }
 569
 570         if (ourport->rx_mode == S3C24XX_RX_DMA) {
 571                 dmaengine_pause(dma->rx_chan);
 572                 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
 573                 dmaengine_terminate_all(dma->rx_chan);
 574                 received = dma->rx_bytes_requested - state.residue;
 575                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 576
 577                 enable_rx_pio(ourport);
 578         }
 579
 580         s3c24xx_serial_rx_drain_fifo(ourport);
 581
 582         if (tty) {
 583                 tty_flip_buffer_push(t);
 584                 tty_kref_put(tty);
 585         }
 586
 587         wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
 588
 589 finish:
 590         spin_unlock_irqrestore(&port->lock, flags);
 591
 592         return IRQ_HANDLED;
 593 }
 594
 595 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
 596 {
 597         struct uart_port *port = &ourport->port;
 598         unsigned int ufcon, ch, flag, ufstat, uerstat;
 599         unsigned int fifocnt = 0;
 600         int max_count = port->fifosize;
 601
 602         while (max_count-- > 0) {
 603                 /*
 604                  * Receive all characters known to be in FIFO
 605                  * before reading FIFO level again
 606                  */
 607                 if (fifocnt == 0) {
 608                         ufstat = rd_regl(port, S3C2410_UFSTAT);
 609                         fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
 610                         if (fifocnt == 0)
 611                                 break;
 612                 }
 613                 fifocnt--;
 614
 615                 uerstat = rd_regl(port, S3C2410_UERSTAT);
 616                 ch = rd_regb(port, S3C2410_URXH);
 617
 618                 if (port->flags & UPF_CONS_FLOW) {
 619                         int txe = s3c24xx_serial_txempty_nofifo(port);
 620
 621                         if (rx_enabled(port)) {
 622                                 if (!txe) {
 623                                         rx_enabled(port) = 0;
 624                                         continue;
 625                                 }
 626                         } else {
 627                                 if (txe) {
 628                                         ufcon = rd_regl(port, S3C2410_UFCON);
 629                                         ufcon |= S3C2410_UFCON_RESETRX;
 630                                         wr_regl(port, S3C2410_UFCON, ufcon);
 631                                         rx_enabled(port) = 1;
 632                                         return;
 633                                 }
 634                                 continue;
 635                         }
 636                 }
 637
 638                 /* insert the character into the buffer */
 639
 640                 flag = TTY_NORMAL;
 641                 port->icount.rx++;
 642
 643                 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
 644                         dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
 645                             ch, uerstat);
 646
 647                         /* check for break */
 648                         if (uerstat & S3C2410_UERSTAT_BREAK) {
 649                                 dbg("break!\n");
 650                                 port->icount.brk++;
 651                                 if (uart_handle_break(port))
 652                                         continue; /* Ignore character */
 653                         }
 654
 655                         if (uerstat & S3C2410_UERSTAT_FRAME)
 656                                 port->icount.frame++;
 657                         if (uerstat & S3C2410_UERSTAT_OVERRUN)
 658                                 port->icount.overrun++;
 659
 660                         uerstat &= port->read_status_mask;
 661
 662                         if (uerstat & S3C2410_UERSTAT_BREAK)
 663                                 flag = TTY_BREAK;
 664                         else if (uerstat & S3C2410_UERSTAT_PARITY)
 665                                 flag = TTY_PARITY;
 666                         else if (uerstat & (S3C2410_UERSTAT_FRAME |
 667                                             S3C2410_UERSTAT_OVERRUN))
 668                                 flag = TTY_FRAME;
 669                 }
 670
 671                 if (uart_handle_sysrq_char(port, ch))
 672                         continue; /* Ignore character */
 673
 674                 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
 675                                  ch, flag);
 676         }
 677
 678         tty_flip_buffer_push(&port->state->port);
 679 }
 680
 681 static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
 682 {
 683         struct s3c24xx_uart_port *ourport = dev_id;
 684         struct uart_port *port = &ourport->port;
 685         unsigned long flags;
 686
 687         spin_lock_irqsave(&port->lock, flags);
 688         s3c24xx_serial_rx_drain_fifo(ourport);
 689         spin_unlock_irqrestore(&port->lock, flags);
 690
 691         return IRQ_HANDLED;
 692 }
 693
 694
 695 static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
 696 {
 697         struct s3c24xx_uart_port *ourport = dev_id;
 698
 699         if (ourport->dma && ourport->dma->rx_chan)
 700                 return s3c24xx_serial_rx_chars_dma(dev_id);
 701         return s3c24xx_serial_rx_chars_pio(dev_id);
 702 }
 703
 704 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 705 {
 706         struct s3c24xx_uart_port *ourport = id;
 707         struct uart_port *port = &ourport->port;
 708         struct circ_buf *xmit = &port->state->xmit;
 709         unsigned long flags;
 710         int count, dma_count = 0;
 711
 712         spin_lock_irqsave(&port->lock, flags);
 713
 714         count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 715
 716         if (ourport->dma && ourport->dma->tx_chan &&
 717             count >= ourport->min_dma_size) {
 718                 int align = dma_get_cache_alignment() -
 719                         (xmit->tail & (dma_get_cache_alignment() - 1));
 720                 if (count-align >= ourport->min_dma_size) {
 721                         dma_count = count-align;
 722                         count = align;
 723                 }
 724         }
 725
 726         if (port->x_char) {
 727                 wr_regb(port, S3C2410_UTXH, port->x_char);
 728                 port->icount.tx++;
 729                 port->x_char = 0;
 730                 goto out;
 731         }
 732
 733         /* if there isn't anything more to transmit, or the uart is now
 734          * stopped, disable the uart and exit
 735         */
 736
 737         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 738                 s3c24xx_serial_stop_tx(port);
 739                 goto out;
 740         }
 741
 742         /* try and drain the buffer... */
 743
 744         if (count > port->fifosize) {
 745                 count = port->fifosize;
 746                 dma_count = 0;
 747         }
 748
 749         while (!uart_circ_empty(xmit) && count > 0) {
 750                 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
 751                         break;
 752
 753                 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
 754                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 755                 port->icount.tx++;
 756                 count--;
 757         }
 758
 759         if (!count && dma_count) {
 760                 s3c24xx_serial_start_tx_dma(ourport, dma_count);
 761                 goto out;
 762         }
 763
 764         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
 765                 spin_unlock(&port->lock);
 766                 uart_write_wakeup(port);
 767                 spin_lock(&port->lock);
 768         }
 769
 770         if (uart_circ_empty(xmit))
 771                 s3c24xx_serial_stop_tx(port);
 772
 773 out:
 774         spin_unlock_irqrestore(&port->lock, flags);
 775         return IRQ_HANDLED;
 776 }
 777
 778 /* interrupt handler for s3c64xx and later SoC's.*/
 779 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
 780 {
 781         struct s3c24xx_uart_port *ourport = id;
 782         struct uart_port *port = &ourport->port;
 783         unsigned int pend = rd_regl(port, S3C64XX_UINTP);
 784         irqreturn_t ret = IRQ_HANDLED;
 785
 786         if (pend & S3C64XX_UINTM_RXD_MSK) {
 787                 ret = s3c24xx_serial_rx_chars(irq, id);
 788                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
 789         }
 790         if (pend & S3C64XX_UINTM_TXD_MSK) {
 791                 ret = s3c24xx_serial_tx_chars(irq, id);
 792                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
 793         }
 794         return ret;
 795 }
 796
 797 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 798 {
 799         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 800         unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
 801         unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
 802
 803         if (ufcon & S3C2410_UFCON_FIFOMODE) {
 804                 if ((ufstat & info->tx_fifomask) != 0 ||
 805                     (ufstat & info->tx_fifofull))
 806                         return 0;
 807
 808                 return 1;
 809         }
 810
 811         return s3c24xx_serial_txempty_nofifo(port);
 812 }
 813
 814 /* no modem control lines */
 815 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
 816 {
 817         unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
 818
 819         if (umstat & S3C2410_UMSTAT_CTS)
 820                 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 821         else
 822                 return TIOCM_CAR | TIOCM_DSR;
 823 }
 824
 825 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 826 {
 827         unsigned int umcon = rd_regl(port, S3C2410_UMCON);
 828
 829         if (mctrl & TIOCM_RTS)
 830                 umcon |= S3C2410_UMCOM_RTS_LOW;
 831         else
 832                 umcon &= ~S3C2410_UMCOM_RTS_LOW;
 833
 834         wr_regl(port, S3C2410_UMCON, umcon);
 835 }
 836
 837 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
 838 {
 839         unsigned long flags;
 840         unsigned int ucon;
 841
 842         spin_lock_irqsave(&port->lock, flags);
 843
 844         ucon = rd_regl(port, S3C2410_UCON);
 845
 846         if (break_state)
 847                 ucon |= S3C2410_UCON_SBREAK;
 848         else
 849                 ucon &= ~S3C2410_UCON_SBREAK;
 850
 851         wr_regl(port, S3C2410_UCON, ucon);
 852
 853         spin_unlock_irqrestore(&port->lock, flags);
 854 }
 855
 856 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
 857 {
 858         struct s3c24xx_uart_dma *dma = p->dma;
 859         struct dma_slave_caps dma_caps;
 860         const char *reason = NULL;
 861         int ret;
 862
 863         /* Default slave configuration parameters */
 864         dma->rx_conf.direction          = DMA_DEV_TO_MEM;
 865         dma->rx_conf.src_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
 866         dma->rx_conf.src_addr           = p->port.mapbase + S3C2410_URXH;
 867         dma->rx_conf.src_maxburst       = 1;
 868
 869         dma->tx_conf.direction          = DMA_MEM_TO_DEV;
 870         dma->tx_conf.dst_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
 871         dma->tx_conf.dst_addr           = p->port.mapbase + S3C2410_UTXH;
 872         dma->tx_conf.dst_maxburst       = 1;
 873
 874         dma->rx_chan = dma_request_chan(p->port.dev, "rx");
 875
 876         if (IS_ERR(dma->rx_chan)) {
 877                 reason = "DMA RX channel request failed";
 878                 ret = PTR_ERR(dma->rx_chan);
 879                 goto err_warn;
 880         }
 881
 882         ret = dma_get_slave_caps(dma->rx_chan, &dma_caps);
 883         if (ret < 0 ||
 884             dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
 885                 reason = "insufficient DMA RX engine capabilities";
 886                 ret = -EOPNOTSUPP;
 887                 goto err_release_rx;
 888         }
 889
 890         dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
 891
 892         dma->tx_chan = dma_request_chan(p->port.dev, "tx");
 893         if (IS_ERR(dma->tx_chan)) {
 894                 reason = "DMA TX channel request failed";
 895                 ret = PTR_ERR(dma->tx_chan);
 896                 goto err_release_rx;
 897         }
 898
 899         ret = dma_get_slave_caps(dma->tx_chan, &dma_caps);
 900         if (ret < 0 ||
 901             dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
 902                 reason = "insufficient DMA TX engine capabilities";
 903                 ret = -EOPNOTSUPP;
 904                 goto err_release_tx;
 905         }
 906
 907         dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
 908
 909         /* RX buffer */
 910         dma->rx_size = PAGE_SIZE;
 911
 912         dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
 913         if (!dma->rx_buf) {
 914                 ret = -ENOMEM;
 915                 goto err_release_tx;
 916         }
 917
 918         dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf,
 919                                 dma->rx_size, DMA_FROM_DEVICE);
 920         if (dma_mapping_error(p->port.dev, dma->rx_addr)) {
 921                 reason = "DMA mapping error for RX buffer";
 922                 ret = -EIO;
 923                 goto err_free_rx;
 924         }
 925
 926         /* TX buffer */
 927         dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf,
 928                                 UART_XMIT_SIZE, DMA_TO_DEVICE);
 929         if (dma_mapping_error(p->port.dev, dma->tx_addr)) {
 930                 reason = "DMA mapping error for TX buffer";
 931                 ret = -EIO;
 932                 goto err_unmap_rx;
 933         }
 934
 935         return 0;
 936
 937 err_unmap_rx:
 938         dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size,
 939                          DMA_FROM_DEVICE);
 940 err_free_rx:
 941         kfree(dma->rx_buf);
 942 err_release_tx:
 943         dma_release_channel(dma->tx_chan);
 944 err_release_rx:
 945         dma_release_channel(dma->rx_chan);
 946 err_warn:
 947         if (reason)
 948                 dev_warn(p->port.dev, "%s, DMA will not be used\n", reason);
 949         return ret;
 950 }
 951
 952 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
 953 {
 954         struct s3c24xx_uart_dma *dma = p->dma;
 955
 956         if (dma->rx_chan) {
 957                 dmaengine_terminate_all(dma->rx_chan);
 958                 dma_unmap_single(p->port.dev, dma->rx_addr,
 959                                 dma->rx_size, DMA_FROM_DEVICE);
 960                 kfree(dma->rx_buf);
 961                 dma_release_channel(dma->rx_chan);
 962                 dma->rx_chan = NULL;
 963         }
 964
 965         if (dma->tx_chan) {
 966                 dmaengine_terminate_all(dma->tx_chan);
 967                 dma_unmap_single(p->port.dev, dma->tx_addr,
 968                                 UART_XMIT_SIZE, DMA_TO_DEVICE);
 969                 dma_release_channel(dma->tx_chan);
 970                 dma->tx_chan = NULL;
 971         }
 972 }
 973
 974 static void s3c24xx_serial_shutdown(struct uart_port *port)
 975 {
 976         struct s3c24xx_uart_port *ourport = to_ourport(port);
 977
 978         if (ourport->tx_claimed) {
 979                 if (!s3c24xx_serial_has_interrupt_mask(port))
 980                         free_irq(ourport->tx_irq, ourport);
 981                 tx_enabled(port) = 0;
 982                 ourport->tx_claimed = 0;
 983                 ourport->tx_mode = 0;
 984         }
 985
 986         if (ourport->rx_claimed) {
 987                 if (!s3c24xx_serial_has_interrupt_mask(port))
 988                         free_irq(ourport->rx_irq, ourport);
 989                 ourport->rx_claimed = 0;
 990                 rx_enabled(port) = 0;
 991         }
 992
 993         /* Clear pending interrupts and mask all interrupts */
 994         if (s3c24xx_serial_has_interrupt_mask(port)) {
 995                 free_irq(port->irq, ourport);
 996
 997                 wr_regl(port, S3C64XX_UINTP, 0xf);
 998                 wr_regl(port, S3C64XX_UINTM, 0xf);
 999         }
1000
1001         if (ourport->dma)
1002                 s3c24xx_serial_release_dma(ourport);
1003
1004         ourport->tx_in_progress = 0;
1005 }
1006
1007 static int s3c24xx_serial_startup(struct uart_port *port)
1008 {
1009         struct s3c24xx_uart_port *ourport = to_ourport(port);
1010         int ret;
1011
1012         dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n",
1013             port, (unsigned long long)port->mapbase, port->membase);
1014
1015         rx_enabled(port) = 1;
1016
1017         ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
1018                           s3c24xx_serial_portname(port), ourport);
1019
1020         if (ret != 0) {
1021                 dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
1022                 return ret;
1023         }
1024
1025         ourport->rx_claimed = 1;
1026
1027         dbg("requesting tx irq...\n");
1028
1029         tx_enabled(port) = 1;
1030
1031         ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
1032                           s3c24xx_serial_portname(port), ourport);
1033
1034         if (ret) {
1035                 dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
1036                 goto err;
1037         }
1038
1039         ourport->tx_claimed = 1;
1040
1041         dbg("s3c24xx_serial_startup ok\n");
1042
1043         /* the port reset code should have done the correct
1044          * register setup for the port controls */
1045
1046         return ret;
1047
1048 err:
1049         s3c24xx_serial_shutdown(port);
1050         return ret;
1051 }
1052
1053 static int s3c64xx_serial_startup(struct uart_port *port)
1054 {
1055         struct s3c24xx_uart_port *ourport = to_ourport(port);
1056         unsigned long flags;
1057         unsigned int ufcon;
1058         int ret;
1059
1060         dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
1061             port, (unsigned long long)port->mapbase, port->membase);
1062
1063         wr_regl(port, S3C64XX_UINTM, 0xf);
1064         if (ourport->dma) {
1065                 ret = s3c24xx_serial_request_dma(ourport);
1066                 if (ret < 0) {
1067                         devm_kfree(port->dev, ourport->dma);
1068                         ourport->dma = NULL;
1069                 }
1070         }
1071
1072         ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1073                           s3c24xx_serial_portname(port), ourport);
1074         if (ret) {
1075                 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1076                 return ret;
1077         }
1078
1079         /* For compatibility with s3c24xx Soc's */
1080         rx_enabled(port) = 1;
1081         ourport->rx_claimed = 1;
1082         tx_enabled(port) = 0;
1083         ourport->tx_claimed = 1;
1084
1085         spin_lock_irqsave(&port->lock, flags);
1086
1087         ufcon = rd_regl(port, S3C2410_UFCON);
1088         ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1089         if (!uart_console(port))
1090                 ufcon |= S3C2410_UFCON_RESETTX;
1091         wr_regl(port, S3C2410_UFCON, ufcon);
1092
1093         enable_rx_pio(ourport);
1094
1095         spin_unlock_irqrestore(&port->lock, flags);
1096
1097         /* Enable Rx Interrupt */
1098         s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM);
1099
1100         dbg("s3c64xx_serial_startup ok\n");
1101         return ret;
1102 }
1103
1104 /* power power management control */
1105
1106 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1107                               unsigned int old)
1108 {
1109         struct s3c24xx_uart_port *ourport = to_ourport(port);
1110         int timeout = 10000;
1111
1112         ourport->pm_level = level;
1113
1114         switch (level) {
1115         case 3:
1116                 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1117                         udelay(100);
1118
1119                 if (!IS_ERR(ourport->baudclk))
1120                         clk_disable_unprepare(ourport->baudclk);
1121
1122                 clk_disable_unprepare(ourport->clk);
1123                 break;
1124
1125         case 0:
1126                 clk_prepare_enable(ourport->clk);
1127
1128                 if (!IS_ERR(ourport->baudclk))
1129                         clk_prepare_enable(ourport->baudclk);
1130
1131                 break;
1132         default:
1133                 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1134         }
1135 }
1136
1137 /* baud rate calculation
1138  *
1139  * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1140  * of different sources, including the peripheral clock ("pclk") and an
1141  * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1142  * with a programmable extra divisor.
1143  *
1144  * The following code goes through the clock sources, and calculates the
1145  * baud clocks (and the resultant actual baud rates) and then tries to
1146  * pick the closest one and select that.
1147  *
1148 */
1149
1150 #define MAX_CLK_NAME_LENGTH 15
1151
1152 static inline int s3c24xx_serial_getsource(struct uart_port *port)
1153 {
1154         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1155         unsigned int ucon;
1156
1157         if (info->num_clks == 1)
1158                 return 0;
1159
1160         ucon = rd_regl(port, S3C2410_UCON);
1161         ucon &= info->clksel_mask;
1162         return ucon >> info->clksel_shift;
1163 }
1164
1165 static void s3c24xx_serial_setsource(struct uart_port *port,
1166                         unsigned int clk_sel)
1167 {
1168         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1169         unsigned int ucon;
1170
1171         if (info->num_clks == 1)
1172                 return;
1173
1174         ucon = rd_regl(port, S3C2410_UCON);
1175         if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1176                 return;
1177
1178         ucon &= ~info->clksel_mask;
1179         ucon |= clk_sel << info->clksel_shift;
1180         wr_regl(port, S3C2410_UCON, ucon);
1181 }
1182
1183 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1184                         unsigned int req_baud, struct clk **best_clk,
1185                         unsigned int *clk_num)
1186 {
1187         struct s3c24xx_uart_info *info = ourport->info;
1188         struct clk *clk;
1189         unsigned long rate;
1190         unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
1191         char clkname[MAX_CLK_NAME_LENGTH];
1192         int calc_deviation, deviation = (1 << 30) - 1;
1193
1194         clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
1195                         ourport->info->def_clk_sel;
1196         for (cnt = 0; cnt < info->num_clks; cnt++) {
1197                 if (!(clk_sel & (1 << cnt)))
1198                         continue;
1199
1200                 sprintf(clkname, "clk_uart_baud%d", cnt);
1201                 clk = clk_get(ourport->port.dev, clkname);
1202                 if (IS_ERR(clk))
1203                         continue;
1204
1205                 rate = clk_get_rate(clk);
1206                 if (!rate)
1207                         continue;
1208
1209                 if (ourport->info->has_divslot) {
1210                         unsigned long div = rate / req_baud;
1211
1212                         /* The UDIVSLOT register on the newer UARTs allows us to
1213                          * get a divisor adjustment of 1/16th on the baud clock.
1214                          *
1215                          * We don't keep the UDIVSLOT value (the 16ths we
1216                          * calculated by not multiplying the baud by 16) as it
1217                          * is easy enough to recalculate.
1218                          */
1219
1220                         quot = div / 16;
1221                         baud = rate / div;
1222                 } else {
1223                         quot = (rate + (8 * req_baud)) / (16 * req_baud);
1224                         baud = rate / (quot * 16);
1225                 }
1226                 quot--;
1227
1228                 calc_deviation = req_baud - baud;
1229                 if (calc_deviation < 0)
1230                         calc_deviation = -calc_deviation;
1231
1232                 if (calc_deviation < deviation) {
1233                         *best_clk = clk;
1234                         best_quot = quot;
1235                         *clk_num = cnt;
1236                         deviation = calc_deviation;
1237                 }
1238         }
1239
1240         return best_quot;
1241 }
1242
1243 /* udivslot_table[]
1244  *
1245  * This table takes the fractional value of the baud divisor and gives
1246  * the recommended setting for the UDIVSLOT register.
1247  */
1248 static u16 udivslot_table[16] = {
1249         [0] = 0x0000,
1250         [1] = 0x0080,
1251         [2] = 0x0808,
1252         [3] = 0x0888,
1253         [4] = 0x2222,
1254         [5] = 0x4924,
1255         [6] = 0x4A52,
1256         [7] = 0x54AA,
1257         [8] = 0x5555,
1258         [9] = 0xD555,
1259         [10] = 0xD5D5,
1260         [11] = 0xDDD5,
1261         [12] = 0xDDDD,
1262         [13] = 0xDFDD,
1263         [14] = 0xDFDF,
1264         [15] = 0xFFDF,
1265 };
1266
1267 static void s3c24xx_serial_set_termios(struct uart_port *port,
1268                                        struct ktermios *termios,
1269                                        struct ktermios *old)
1270 {
1271         struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1272         struct s3c24xx_uart_port *ourport = to_ourport(port);
1273         struct clk *clk = ERR_PTR(-EINVAL);
1274         unsigned long flags;
1275         unsigned int baud, quot, clk_sel = 0;
1276         unsigned int ulcon;
1277         unsigned int umcon;
1278         unsigned int udivslot = 0;
1279
1280         /*
1281          * We don't support modem control lines.
1282          */
1283         termios->c_cflag &= ~(HUPCL | CMSPAR);
1284         termios->c_cflag |= CLOCAL;
1285
1286         /*
1287          * Ask the core to calculate the divisor for us.
1288          */
1289
1290         baud = uart_get_baud_rate(port, termios, old, 0, 3000000);
1291         quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1292         if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1293                 quot = port->custom_divisor;
1294         if (IS_ERR(clk))
1295                 return;
1296
1297         /* check to see if we need  to change clock source */
1298
1299         if (ourport->baudclk != clk) {
1300                 clk_prepare_enable(clk);
1301
1302                 s3c24xx_serial_setsource(port, clk_sel);
1303
1304                 if (!IS_ERR(ourport->baudclk)) {
1305                         clk_disable_unprepare(ourport->baudclk);
1306                         ourport->baudclk = ERR_PTR(-EINVAL);
1307                 }
1308
1309                 ourport->baudclk = clk;
1310                 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1311         }
1312
1313         if (ourport->info->has_divslot) {
1314                 unsigned int div = ourport->baudclk_rate / baud;
1315
1316                 if (cfg->has_fracval) {
1317                         udivslot = (div & 15);
1318                         dbg("fracval = %04x\n", udivslot);
1319                 } else {
1320                         udivslot = udivslot_table[div & 15];
1321                         dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
1322                 }
1323         }
1324
1325         switch (termios->c_cflag & CSIZE) {
1326         case CS5:
1327                 dbg("config: 5bits/char\n");
1328                 ulcon = S3C2410_LCON_CS5;
1329                 break;
1330         case CS6:
1331                 dbg("config: 6bits/char\n");
1332                 ulcon = S3C2410_LCON_CS6;
1333                 break;
1334         case CS7:
1335                 dbg("config: 7bits/char\n");
1336                 ulcon = S3C2410_LCON_CS7;
1337                 break;
1338         case CS8:
1339         default:
1340                 dbg("config: 8bits/char\n");
1341                 ulcon = S3C2410_LCON_CS8;
1342                 break;
1343         }
1344
1345         /* preserve original lcon IR settings */
1346         ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1347
1348         if (termios->c_cflag & CSTOPB)
1349                 ulcon |= S3C2410_LCON_STOPB;
1350
1351         if (termios->c_cflag & PARENB) {
1352                 if (termios->c_cflag & PARODD)
1353                         ulcon |= S3C2410_LCON_PODD;
1354                 else
1355                         ulcon |= S3C2410_LCON_PEVEN;
1356         } else {
1357                 ulcon |= S3C2410_LCON_PNONE;
1358         }
1359
1360         spin_lock_irqsave(&port->lock, flags);
1361
1362         dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1363             ulcon, quot, udivslot);
1364
1365         wr_regl(port, S3C2410_ULCON, ulcon);
1366         wr_regl(port, S3C2410_UBRDIV, quot);
1367
1368         port->status &= ~UPSTAT_AUTOCTS;
1369
1370         umcon = rd_regl(port, S3C2410_UMCON);
1371         if (termios->c_cflag & CRTSCTS) {
1372                 umcon |= S3C2410_UMCOM_AFC;
1373                 /* Disable RTS when RX FIFO contains 63 bytes */
1374                 umcon &= ~S3C2412_UMCON_AFC_8;
1375                 port->status = UPSTAT_AUTOCTS;
1376         } else {
1377                 umcon &= ~S3C2410_UMCOM_AFC;
1378         }
1379         wr_regl(port, S3C2410_UMCON, umcon);
1380
1381         if (ourport->info->has_divslot)
1382                 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1383
1384         dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1385             rd_regl(port, S3C2410_ULCON),
1386             rd_regl(port, S3C2410_UCON),
1387             rd_regl(port, S3C2410_UFCON));
1388
1389         /*
1390          * Update the per-port timeout.
1391          */
1392         uart_update_timeout(port, termios->c_cflag, baud);
1393
1394         /*
1395          * Which character status flags are we interested in?
1396          */
1397         port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1398         if (termios->c_iflag & INPCK)
1399                 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1400                         S3C2410_UERSTAT_PARITY;
1401         /*
1402          * Which character status flags should we ignore?
1403          */
1404         port->ignore_status_mask = 0;
1405         if (termios->c_iflag & IGNPAR)
1406                 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1407         if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1408                 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1409
1410         /*
1411          * Ignore all characters if CREAD is not set.
1412          */
1413         if ((termios->c_cflag & CREAD) == 0)
1414                 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1415
1416         spin_unlock_irqrestore(&port->lock, flags);
1417 }
1418
1419 static const char *s3c24xx_serial_type(struct uart_port *port)
1420 {
1421         switch (port->type) {
1422         case PORT_S3C2410:
1423                 return "S3C2410";
1424         case PORT_S3C2440:
1425                 return "S3C2440";
1426         case PORT_S3C2412:
1427                 return "S3C2412";
1428         case PORT_S3C6400:
1429                 return "S3C6400/10";
1430         default:
1431                 return NULL;
1432         }
1433 }
1434
1435 #define MAP_SIZE (0x100)
1436
1437 static void s3c24xx_serial_release_port(struct uart_port *port)
1438 {
1439         release_mem_region(port->mapbase, MAP_SIZE);
1440 }
1441
1442 static int s3c24xx_serial_request_port(struct uart_port *port)
1443 {
1444         const char *name = s3c24xx_serial_portname(port);
1445         return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
1446 }
1447
1448 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1449 {
1450         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1451
1452         if (flags & UART_CONFIG_TYPE &&
1453             s3c24xx_serial_request_port(port) == 0)
1454                 port->type = info->type;
1455 }
1456
1457 /*
1458  * verify the new serial_struct (for TIOCSSERIAL).
1459  */
1460 static int
1461 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1462 {
1463         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1464
1465         if (ser->type != PORT_UNKNOWN && ser->type != info->type)
1466                 return -EINVAL;
1467
1468         return 0;
1469 }
1470
1471
1472 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1473
1474 static struct console s3c24xx_serial_console;
1475
1476 static int __init s3c24xx_serial_console_init(void)
1477 {
1478         register_console(&s3c24xx_serial_console);
1479         return 0;
1480 }
1481 console_initcall(s3c24xx_serial_console_init);
1482
1483 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1484 #else
1485 #define S3C24XX_SERIAL_CONSOLE NULL
1486 #endif
1487
1488 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1489 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1490 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1491                          unsigned char c);
1492 #endif
1493
1494 static struct uart_ops s3c24xx_serial_ops = {
1495         .pm             = s3c24xx_serial_pm,
1496         .tx_empty       = s3c24xx_serial_tx_empty,
1497         .get_mctrl      = s3c24xx_serial_get_mctrl,
1498         .set_mctrl      = s3c24xx_serial_set_mctrl,
1499         .stop_tx        = s3c24xx_serial_stop_tx,
1500         .start_tx       = s3c24xx_serial_start_tx,
1501         .stop_rx        = s3c24xx_serial_stop_rx,
1502         .break_ctl      = s3c24xx_serial_break_ctl,
1503         .startup        = s3c24xx_serial_startup,
1504         .shutdown       = s3c24xx_serial_shutdown,
1505         .set_termios    = s3c24xx_serial_set_termios,
1506         .type           = s3c24xx_serial_type,
1507         .release_port   = s3c24xx_serial_release_port,
1508         .request_port   = s3c24xx_serial_request_port,
1509         .config_port    = s3c24xx_serial_config_port,
1510         .verify_port    = s3c24xx_serial_verify_port,
1511 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1512         .poll_get_char = s3c24xx_serial_get_poll_char,
1513         .poll_put_char = s3c24xx_serial_put_poll_char,
1514 #endif
1515 };
1516
1517 static struct uart_driver s3c24xx_uart_drv = {
1518         .owner          = THIS_MODULE,
1519         .driver_name    = "s3c2410_serial",
1520         .nr             = CONFIG_SERIAL_SAMSUNG_UARTS,
1521         .cons           = S3C24XX_SERIAL_CONSOLE,
1522         .dev_name       = S3C24XX_SERIAL_NAME,
1523         .major          = S3C24XX_SERIAL_MAJOR,
1524         .minor          = S3C24XX_SERIAL_MINOR,
1525 };
1526
1527 #define __PORT_LOCK_UNLOCKED(i) \
1528         __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
1529 static struct s3c24xx_uart_port
1530 s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
1531         [0] = {
1532                 .port = {
1533                         .lock           = __PORT_LOCK_UNLOCKED(0),
1534                         .iotype         = UPIO_MEM,
1535                         .uartclk        = 0,
1536                         .fifosize       = 16,
1537                         .ops            = &s3c24xx_serial_ops,
1538                         .flags          = UPF_BOOT_AUTOCONF,
1539                         .line           = 0,
1540                 }
1541         },
1542         [1] = {
1543                 .port = {
1544                         .lock           = __PORT_LOCK_UNLOCKED(1),
1545                         .iotype         = UPIO_MEM,
1546                         .uartclk        = 0,
1547                         .fifosize       = 16,
1548                         .ops            = &s3c24xx_serial_ops,
1549                         .flags          = UPF_BOOT_AUTOCONF,
1550                         .line           = 1,
1551                 }
1552         },
1553 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
1554
1555         [2] = {
1556                 .port = {
1557                         .lock           = __PORT_LOCK_UNLOCKED(2),
1558                         .iotype         = UPIO_MEM,
1559                         .uartclk        = 0,
1560                         .fifosize       = 16,
1561                         .ops            = &s3c24xx_serial_ops,
1562                         .flags          = UPF_BOOT_AUTOCONF,
1563                         .line           = 2,
1564                 }
1565         },
1566 #endif
1567 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
1568         [3] = {
1569                 .port = {
1570                         .lock           = __PORT_LOCK_UNLOCKED(3),
1571                         .iotype         = UPIO_MEM,
1572                         .uartclk        = 0,
1573                         .fifosize       = 16,
1574                         .ops            = &s3c24xx_serial_ops,
1575                         .flags          = UPF_BOOT_AUTOCONF,
1576                         .line           = 3,
1577                 }
1578         }
1579 #endif
1580 };
1581 #undef __PORT_LOCK_UNLOCKED
1582
1583 /* s3c24xx_serial_resetport
1584  *
1585  * reset the fifos and other the settings.
1586 */
1587
1588 static void s3c24xx_serial_resetport(struct uart_port *port,
1589                                    struct s3c2410_uartcfg *cfg)
1590 {
1591         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1592         unsigned long ucon = rd_regl(port, S3C2410_UCON);
1593         unsigned int ucon_mask;
1594
1595         ucon_mask = info->clksel_mask;
1596         if (info->type == PORT_S3C2440)
1597                 ucon_mask |= S3C2440_UCON0_DIVMASK;
1598
1599         ucon &= ucon_mask;
1600         wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
1601
1602         /* reset both fifos */
1603         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1604         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1605
1606         /* some delay is required after fifo reset */
1607         udelay(1);
1608 }
1609
1610
1611 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ
1612
1613 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
1614                                              unsigned long val, void *data)
1615 {
1616         struct s3c24xx_uart_port *port;
1617         struct uart_port *uport;
1618
1619         port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1620         uport = &port->port;
1621
1622         /* check to see if port is enabled */
1623
1624         if (port->pm_level != 0)
1625                 return 0;
1626
1627         /* try and work out if the baudrate is changing, we can detect
1628          * a change in rate, but we do not have support for detecting
1629          * a disturbance in the clock-rate over the change.
1630          */
1631
1632         if (IS_ERR(port->baudclk))
1633                 goto exit;
1634
1635         if (port->baudclk_rate == clk_get_rate(port->baudclk))
1636                 goto exit;
1637
1638         if (val == CPUFREQ_PRECHANGE) {
1639                 /* we should really shut the port down whilst the
1640                  * frequency change is in progress. */
1641
1642         } else if (val == CPUFREQ_POSTCHANGE) {
1643                 struct ktermios *termios;
1644                 struct tty_struct *tty;
1645
1646                 if (uport->state == NULL)
1647                         goto exit;
1648
1649                 tty = uport->state->port.tty;
1650
1651                 if (tty == NULL)
1652                         goto exit;
1653
1654                 termios = &tty->termios;
1655
1656                 if (termios == NULL) {
1657                         dev_warn(uport->dev, "%s: no termios?\n", __func__);
1658                         goto exit;
1659                 }
1660
1661                 s3c24xx_serial_set_termios(uport, termios, NULL);
1662         }
1663
1664 exit:
1665         return 0;
1666 }
1667
1668 static inline int
1669 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1670 {
1671         port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1672
1673         return cpufreq_register_notifier(&port->freq_transition,
1674                                          CPUFREQ_TRANSITION_NOTIFIER);
1675 }
1676
1677 static inline void
1678 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1679 {
1680         cpufreq_unregister_notifier(&port->freq_transition,
1681                                     CPUFREQ_TRANSITION_NOTIFIER);
1682 }
1683
1684 #else
1685 static inline int
1686 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1687 {
1688         return 0;
1689 }
1690
1691 static inline void
1692 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1693 {
1694 }
1695 #endif
1696
1697 static int s3c24xx_serial_enable_baudclk(struct s3c24xx_uart_port *ourport)
1698 {
1699         struct device *dev = ourport->port.dev;
1700         struct s3c24xx_uart_info *info = ourport->info;
1701         char clk_name[MAX_CLK_NAME_LENGTH];
1702         unsigned int clk_sel;
1703         struct clk *clk;
1704         int clk_num;
1705         int ret;
1706
1707         clk_sel = ourport->cfg->clk_sel ? : info->def_clk_sel;
1708         for (clk_num = 0; clk_num < info->num_clks; clk_num++) {
1709                 if (!(clk_sel & (1 << clk_num)))
1710                         continue;
1711
1712                 sprintf(clk_name, "clk_uart_baud%d", clk_num);
1713                 clk = clk_get(dev, clk_name);
1714                 if (IS_ERR(clk))
1715                         continue;
1716
1717                 ret = clk_prepare_enable(clk);
1718                 if (ret) {
1719                         clk_put(clk);
1720                         continue;
1721                 }
1722
1723                 ourport->baudclk = clk;
1724                 ourport->baudclk_rate = clk_get_rate(clk);
1725                 s3c24xx_serial_setsource(&ourport->port, clk_num);
1726
1727                 return 0;
1728         }
1729
1730         return -EINVAL;
1731 }
1732
1733 /* s3c24xx_serial_init_port
1734  *
1735  * initialise a single serial port from the platform device given
1736  */
1737
1738 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1739                                     struct platform_device *platdev)
1740 {
1741         struct uart_port *port = &ourport->port;
1742         struct s3c2410_uartcfg *cfg = ourport->cfg;
1743         struct resource *res;
1744         int ret;
1745
1746         dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1747
1748         if (platdev == NULL)
1749                 return -ENODEV;
1750
1751         if (port->mapbase != 0)
1752                 return -EINVAL;
1753
1754         /* setup info for port */
1755         port->dev       = &platdev->dev;
1756
1757         /* Startup sequence is different for s3c64xx and higher SoC's */
1758         if (s3c24xx_serial_has_interrupt_mask(port))
1759                 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1760
1761         port->uartclk = 1;
1762
1763         if (cfg->uart_flags & UPF_CONS_FLOW) {
1764                 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1765                 port->flags |= UPF_CONS_FLOW;
1766         }
1767
1768         /* sort our the physical and virtual addresses for each UART */
1769
1770         res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1771         if (res == NULL) {
1772                 dev_err(port->dev, "failed to find memory resource for uart\n");
1773                 return -EINVAL;
1774         }
1775
1776         dbg("resource %pR)\n", res);
1777
1778         port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
1779         if (!port->membase) {
1780                 dev_err(port->dev, "failed to remap controller address\n");
1781                 return -EBUSY;
1782         }
1783
1784         port->mapbase = res->start;
1785         ret = platform_get_irq(platdev, 0);
1786         if (ret < 0)
1787                 port->irq = 0;
1788         else {
1789                 port->irq = ret;
1790                 ourport->rx_irq = ret;
1791                 ourport->tx_irq = ret + 1;
1792         }
1793
1794         ret = platform_get_irq(platdev, 1);
1795         if (ret > 0)
1796                 ourport->tx_irq = ret;
1797         /*
1798          * DMA is currently supported only on DT platforms, if DMA properties
1799          * are specified.
1800          */
1801         if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1802                                                      "dmas", NULL)) {
1803                 ourport->dma = devm_kzalloc(port->dev,
1804                                             sizeof(*ourport->dma),
1805                                             GFP_KERNEL);
1806                 if (!ourport->dma) {
1807                         ret = -ENOMEM;
1808                         goto err;
1809                 }
1810         }
1811
1812         ourport->clk    = clk_get(&platdev->dev, "uart");
1813         if (IS_ERR(ourport->clk)) {
1814                 pr_err("%s: Controller clock not found\n",
1815                                 dev_name(&platdev->dev));
1816                 ret = PTR_ERR(ourport->clk);
1817                 goto err;
1818         }
1819
1820         ret = clk_prepare_enable(ourport->clk);
1821         if (ret) {
1822                 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1823                 clk_put(ourport->clk);
1824                 goto err;
1825         }
1826
1827         ret = s3c24xx_serial_enable_baudclk(ourport);
1828         if (ret)
1829                 pr_warn("uart: failed to enable baudclk\n");
1830
1831         /* Keep all interrupts masked and cleared */
1832         if (s3c24xx_serial_has_interrupt_mask(port)) {
1833                 wr_regl(port, S3C64XX_UINTM, 0xf);
1834                 wr_regl(port, S3C64XX_UINTP, 0xf);
1835                 wr_regl(port, S3C64XX_UINTSP, 0xf);
1836         }
1837
1838         dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1839             &port->mapbase, port->membase, port->irq,
1840             ourport->rx_irq, ourport->tx_irq, port->uartclk);
1841
1842         /* reset the fifos (and setup the uart) */
1843         s3c24xx_serial_resetport(port, cfg);
1844
1845         return 0;
1846
1847 err:
1848         port->mapbase = 0;
1849         return ret;
1850 }
1851
1852 /* Device driver serial port probe */
1853
1854 static const struct of_device_id s3c24xx_uart_dt_match[];
1855 static int probe_index;
1856
1857 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1858                         struct platform_device *pdev)
1859 {
1860 #ifdef CONFIG_OF
1861         if (pdev->dev.of_node) {
1862                 const struct of_device_id *match;
1863                 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1864                 return (struct s3c24xx_serial_drv_data *)match->data;
1865         }
1866 #endif
1867         return (struct s3c24xx_serial_drv_data *)
1868                         platform_get_device_id(pdev)->driver_data;
1869 }
1870
1871 static int s3c24xx_serial_probe(struct platform_device *pdev)
1872 {
1873         struct device_node *np = pdev->dev.of_node;
1874         struct s3c24xx_uart_port *ourport;
1875         int index = probe_index;
1876         int ret;
1877
1878         if (np) {
1879                 ret = of_alias_get_id(np, "serial");
1880                 if (ret >= 0)
1881                         index = ret;
1882         }
1883
1884         dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index);
1885
1886         if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) {
1887                 dev_err(&pdev->dev, "serial%d out of range\n", index);
1888                 return -EINVAL;
1889         }
1890         ourport = &s3c24xx_serial_ports[index];
1891
1892         ourport->drv_data = s3c24xx_get_driver_data(pdev);
1893         if (!ourport->drv_data) {
1894                 dev_err(&pdev->dev, "could not find driver data\n");
1895                 return -ENODEV;
1896         }
1897
1898         ourport->baudclk = ERR_PTR(-EINVAL);
1899         ourport->info = ourport->drv_data->info;
1900         ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1901                         dev_get_platdata(&pdev->dev) :
1902                         ourport->drv_data->def_cfg;
1903
1904         if (np)
1905                 of_property_read_u32(np,
1906                         "samsung,uart-fifosize", &ourport->port.fifosize);
1907
1908         if (ourport->drv_data->fifosize[index])
1909                 ourport->port.fifosize = ourport->drv_data->fifosize[index];
1910         else if (ourport->info->fifosize)
1911                 ourport->port.fifosize = ourport->info->fifosize;
1912
1913         /*
1914          * DMA transfers must be aligned at least to cache line size,
1915          * so find minimal transfer size suitable for DMA mode
1916          */
1917         ourport->min_dma_size = max_t(int, ourport->port.fifosize,
1918                                     dma_get_cache_alignment());
1919
1920         dbg("%s: initialising port %p...\n", __func__, ourport);
1921
1922         ret = s3c24xx_serial_init_port(ourport, pdev);
1923         if (ret < 0)
1924                 return ret;
1925
1926         if (!s3c24xx_uart_drv.state) {
1927                 ret = uart_register_driver(&s3c24xx_uart_drv);
1928                 if (ret < 0) {
1929                         pr_err("Failed to register Samsung UART driver\n");
1930                         return ret;
1931                 }
1932         }
1933
1934         dbg("%s: adding port\n", __func__);
1935         uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1936         platform_set_drvdata(pdev, &ourport->port);
1937
1938         /*
1939          * Deactivate the clock enabled in s3c24xx_serial_init_port here,
1940          * so that a potential re-enablement through the pm-callback overlaps
1941          * and keeps the clock enabled in this case.
1942          */
1943         clk_disable_unprepare(ourport->clk);
1944         if (!IS_ERR(ourport->baudclk))
1945                 clk_disable_unprepare(ourport->baudclk);
1946
1947         ret = s3c24xx_serial_cpufreq_register(ourport);
1948         if (ret < 0)
1949                 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1950
1951         probe_index++;
1952
1953         return 0;
1954 }
1955
1956 static int s3c24xx_serial_remove(struct platform_device *dev)
1957 {
1958         struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1959
1960         if (port) {
1961                 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1962                 uart_remove_one_port(&s3c24xx_uart_drv, port);
1963         }
1964
1965         uart_unregister_driver(&s3c24xx_uart_drv);
1966
1967         return 0;
1968 }
1969
1970 /* UART power management code */
1971 #ifdef CONFIG_PM_SLEEP
1972 static int s3c24xx_serial_suspend(struct device *dev)
1973 {
1974         struct uart_port *port = s3c24xx_dev_to_port(dev);
1975
1976         if (port)
1977                 uart_suspend_port(&s3c24xx_uart_drv, port);
1978
1979         return 0;
1980 }
1981
1982 static int s3c24xx_serial_resume(struct device *dev)
1983 {
1984         struct uart_port *port = s3c24xx_dev_to_port(dev);
1985         struct s3c24xx_uart_port *ourport = to_ourport(port);
1986
1987         if (port) {
1988                 clk_prepare_enable(ourport->clk);
1989                 if (!IS_ERR(ourport->baudclk))
1990                         clk_prepare_enable(ourport->baudclk);
1991                 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1992                 if (!IS_ERR(ourport->baudclk))
1993                         clk_disable_unprepare(ourport->baudclk);
1994                 clk_disable_unprepare(ourport->clk);
1995
1996                 uart_resume_port(&s3c24xx_uart_drv, port);
1997         }
1998
1999         return 0;
2000 }
2001
2002 static int s3c24xx_serial_resume_noirq(struct device *dev)
2003 {
2004         struct uart_port *port = s3c24xx_dev_to_port(dev);
2005         struct s3c24xx_uart_port *ourport = to_ourport(port);
2006
2007         if (port) {
2008                 /* restore IRQ mask */
2009                 if (s3c24xx_serial_has_interrupt_mask(port)) {
2010                         unsigned int uintm = 0xf;
2011                         if (tx_enabled(port))
2012                                 uintm &= ~S3C64XX_UINTM_TXD_MSK;
2013                         if (rx_enabled(port))
2014                                 uintm &= ~S3C64XX_UINTM_RXD_MSK;
2015                         clk_prepare_enable(ourport->clk);
2016                         if (!IS_ERR(ourport->baudclk))
2017                                 clk_prepare_enable(ourport->baudclk);
2018                         wr_regl(port, S3C64XX_UINTM, uintm);
2019                         if (!IS_ERR(ourport->baudclk))
2020                                 clk_disable_unprepare(ourport->baudclk);
2021                         clk_disable_unprepare(ourport->clk);
2022                 }
2023         }
2024
2025         return 0;
2026 }
2027
2028 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
2029         .suspend = s3c24xx_serial_suspend,
2030         .resume = s3c24xx_serial_resume,
2031         .resume_noirq = s3c24xx_serial_resume_noirq,
2032 };
2033 #define SERIAL_SAMSUNG_PM_OPS   (&s3c24xx_serial_pm_ops)
2034
2035 #else /* !CONFIG_PM_SLEEP */
2036
2037 #define SERIAL_SAMSUNG_PM_OPS   NULL
2038 #endif /* CONFIG_PM_SLEEP */
2039
2040 /* Console code */
2041
2042 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2043
2044 static struct uart_port *cons_uart;
2045
2046 static int
2047 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
2048 {
2049         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
2050         unsigned long ufstat, utrstat;
2051
2052         if (ufcon & S3C2410_UFCON_FIFOMODE) {
2053                 /* fifo mode - check amount of data in fifo registers... */
2054
2055                 ufstat = rd_regl(port, S3C2410_UFSTAT);
2056                 return (ufstat & info->tx_fifofull) ? 0 : 1;
2057         }
2058
2059         /* in non-fifo mode, we go and use the tx buffer empty */
2060
2061         utrstat = rd_regl(port, S3C2410_UTRSTAT);
2062         return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
2063 }
2064
2065 static bool
2066 s3c24xx_port_configured(unsigned int ucon)
2067 {
2068         /* consider the serial port configured if the tx/rx mode set */
2069         return (ucon & 0xf) != 0;
2070 }
2071
2072 #ifdef CONFIG_CONSOLE_POLL
2073 /*
2074  * Console polling routines for writing and reading from the uart while
2075  * in an interrupt or debug context.
2076  */
2077
2078 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
2079 {
2080         struct s3c24xx_uart_port *ourport = to_ourport(port);
2081         unsigned int ufstat;
2082
2083         ufstat = rd_regl(port, S3C2410_UFSTAT);
2084         if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
2085                 return NO_POLL_CHAR;
2086
2087         return rd_regb(port, S3C2410_URXH);
2088 }
2089
2090 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
2091                 unsigned char c)
2092 {
2093         unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2094         unsigned int ucon = rd_regl(port, S3C2410_UCON);
2095
2096         /* not possible to xmit on unconfigured port */
2097         if (!s3c24xx_port_configured(ucon))
2098                 return;
2099
2100         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2101                 cpu_relax();
2102         wr_regb(port, S3C2410_UTXH, c);
2103 }
2104
2105 #endif /* CONFIG_CONSOLE_POLL */
2106
2107 static void
2108 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
2109 {
2110         unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2111
2112         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2113                 cpu_relax();
2114         wr_regb(port, S3C2410_UTXH, ch);
2115 }
2116
2117 static void
2118 s3c24xx_serial_console_write(struct console *co, const char *s,
2119                              unsigned int count)
2120 {
2121         unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
2122
2123         /* not possible to xmit on unconfigured port */
2124         if (!s3c24xx_port_configured(ucon))
2125                 return;
2126
2127         uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2128 }
2129
2130 static void __init
2131 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2132                            int *parity, int *bits)
2133 {
2134         struct clk *clk;
2135         unsigned int ulcon;
2136         unsigned int ucon;
2137         unsigned int ubrdiv;
2138         unsigned long rate;
2139         unsigned int clk_sel;
2140         char clk_name[MAX_CLK_NAME_LENGTH];
2141
2142         ulcon  = rd_regl(port, S3C2410_ULCON);
2143         ucon   = rd_regl(port, S3C2410_UCON);
2144         ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2145
2146         dbg("s3c24xx_serial_get_options: port=%p\n"
2147             "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
2148             port, ulcon, ucon, ubrdiv);
2149
2150         if (s3c24xx_port_configured(ucon)) {
2151                 switch (ulcon & S3C2410_LCON_CSMASK) {
2152                 case S3C2410_LCON_CS5:
2153                         *bits = 5;
2154                         break;
2155                 case S3C2410_LCON_CS6:
2156                         *bits = 6;
2157                         break;
2158                 case S3C2410_LCON_CS7:
2159                         *bits = 7;
2160                         break;
2161                 case S3C2410_LCON_CS8:
2162                 default:
2163                         *bits = 8;
2164                         break;
2165                 }
2166
2167                 switch (ulcon & S3C2410_LCON_PMASK) {
2168                 case S3C2410_LCON_PEVEN:
2169                         *parity = 'e';
2170                         break;
2171
2172                 case S3C2410_LCON_PODD:
2173                         *parity = 'o';
2174                         break;
2175
2176                 case S3C2410_LCON_PNONE:
2177                 default:
2178                         *parity = 'n';
2179                 }
2180
2181                 /* now calculate the baud rate */
2182
2183                 clk_sel = s3c24xx_serial_getsource(port);
2184                 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2185
2186                 clk = clk_get(port->dev, clk_name);
2187                 if (!IS_ERR(clk))
2188                         rate = clk_get_rate(clk);
2189                 else
2190                         rate = 1;
2191
2192                 *baud = rate / (16 * (ubrdiv + 1));
2193                 dbg("calculated baud %d\n", *baud);
2194         }
2195
2196 }
2197
2198 static int __init
2199 s3c24xx_serial_console_setup(struct console *co, char *options)
2200 {
2201         struct uart_port *port;
2202         int baud = 9600;
2203         int bits = 8;
2204         int parity = 'n';
2205         int flow = 'n';
2206
2207         dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
2208             co, co->index, options);
2209
2210         /* is this a valid port */
2211
2212         if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
2213                 co->index = 0;
2214
2215         port = &s3c24xx_serial_ports[co->index].port;
2216
2217         /* is the port configured? */
2218
2219         if (port->mapbase == 0x0)
2220                 return -ENODEV;
2221
2222         cons_uart = port;
2223
2224         dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
2225
2226         /*
2227          * Check whether an invalid uart number has been specified, and
2228          * if so, search for the first available port that does have
2229          * console support.
2230          */
2231         if (options)
2232                 uart_parse_options(options, &baud, &parity, &bits, &flow);
2233         else
2234                 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2235
2236         dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
2237
2238         return uart_set_options(port, co, baud, parity, bits, flow);
2239 }
2240
2241 static struct console s3c24xx_serial_console = {
2242         .name           = S3C24XX_SERIAL_NAME,
2243         .device         = uart_console_device,
2244         .flags          = CON_PRINTBUFFER,
2245         .index          = -1,
2246         .write          = s3c24xx_serial_console_write,
2247         .setup          = s3c24xx_serial_console_setup,
2248         .data           = &s3c24xx_uart_drv,
2249 };
2250 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2251
2252 #ifdef CONFIG_CPU_S3C2410
2253 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
2254         .info = &(struct s3c24xx_uart_info) {
2255                 .name           = "Samsung S3C2410 UART",
2256                 .type           = PORT_S3C2410,
2257                 .fifosize       = 16,
2258                 .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
2259                 .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
2260                 .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
2261                 .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
2262                 .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
2263                 .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
2264                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2265                 .num_clks       = 2,
2266                 .clksel_mask    = S3C2410_UCON_CLKMASK,
2267                 .clksel_shift   = S3C2410_UCON_CLKSHIFT,
2268         },
2269         .def_cfg = &(struct s3c2410_uartcfg) {
2270                 .ucon           = S3C2410_UCON_DEFAULT,
2271                 .ufcon          = S3C2410_UFCON_DEFAULT,
2272         },
2273 };
2274 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
2275 #else
2276 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2277 #endif
2278
2279 #ifdef CONFIG_CPU_S3C2412
2280 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
2281         .info = &(struct s3c24xx_uart_info) {
2282                 .name           = "Samsung S3C2412 UART",
2283                 .type           = PORT_S3C2412,
2284                 .fifosize       = 64,
2285                 .has_divslot    = 1,
2286                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2287                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2288                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2289                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2290                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2291                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2292                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2293                 .num_clks       = 4,
2294                 .clksel_mask    = S3C2412_UCON_CLKMASK,
2295                 .clksel_shift   = S3C2412_UCON_CLKSHIFT,
2296         },
2297         .def_cfg = &(struct s3c2410_uartcfg) {
2298                 .ucon           = S3C2410_UCON_DEFAULT,
2299                 .ufcon          = S3C2410_UFCON_DEFAULT,
2300         },
2301 };
2302 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
2303 #else
2304 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2305 #endif
2306
2307 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
2308         defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
2309 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
2310         .info = &(struct s3c24xx_uart_info) {
2311                 .name           = "Samsung S3C2440 UART",
2312                 .type           = PORT_S3C2440,
2313                 .fifosize       = 64,
2314                 .has_divslot    = 1,
2315                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2316                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2317                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2318                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2319                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2320                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2321                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2322                 .num_clks       = 4,
2323                 .clksel_mask    = S3C2412_UCON_CLKMASK,
2324                 .clksel_shift   = S3C2412_UCON_CLKSHIFT,
2325         },
2326         .def_cfg = &(struct s3c2410_uartcfg) {
2327                 .ucon           = S3C2410_UCON_DEFAULT,
2328                 .ufcon          = S3C2410_UFCON_DEFAULT,
2329         },
2330 };
2331 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
2332 #else
2333 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2334 #endif
2335
2336 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2337 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2338         .info = &(struct s3c24xx_uart_info) {
2339                 .name           = "Samsung S3C6400 UART",
2340                 .type           = PORT_S3C6400,
2341                 .fifosize       = 64,
2342                 .has_divslot    = 1,
2343                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2344                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2345                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2346                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2347                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2348                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2349                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2350                 .num_clks       = 4,
2351                 .clksel_mask    = S3C6400_UCON_CLKMASK,
2352                 .clksel_shift   = S3C6400_UCON_CLKSHIFT,
2353         },
2354         .def_cfg = &(struct s3c2410_uartcfg) {
2355                 .ucon           = S3C2410_UCON_DEFAULT,
2356                 .ufcon          = S3C2410_UFCON_DEFAULT,
2357         },
2358 };
2359 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
2360 #else
2361 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2362 #endif
2363
2364 #ifdef CONFIG_CPU_S5PV210
2365 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2366         .info = &(struct s3c24xx_uart_info) {
2367                 .name           = "Samsung S5PV210 UART",
2368                 .type           = PORT_S3C6400,
2369                 .has_divslot    = 1,
2370                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,
2371                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,
2372                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,
2373                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,
2374                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,
2375                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,
2376                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2377                 .num_clks       = 2,
2378                 .clksel_mask    = S5PV210_UCON_CLKMASK,
2379                 .clksel_shift   = S5PV210_UCON_CLKSHIFT,
2380         },
2381         .def_cfg = &(struct s3c2410_uartcfg) {
2382                 .ucon           = S5PV210_UCON_DEFAULT,
2383                 .ufcon          = S5PV210_UFCON_DEFAULT,
2384         },
2385         .fifosize = { 256, 64, 16, 16 },
2386 };
2387 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
2388 #else
2389 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2390 #endif
2391
2392 #if defined(CONFIG_ARCH_EXYNOS)
2393 #define EXYNOS_COMMON_SERIAL_DRV_DATA                           \
2394         .info = &(struct s3c24xx_uart_info) {                   \
2395                 .name           = "Samsung Exynos UART",        \
2396                 .type           = PORT_S3C6400,                 \
2397                 .has_divslot    = 1,                            \
2398                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
2399                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
2400                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
2401                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
2402                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
2403                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
2404                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,         \
2405                 .num_clks       = 1,                            \
2406                 .clksel_mask    = 0,                            \
2407                 .clksel_shift   = 0,                            \
2408         },                                                      \
2409         .def_cfg = &(struct s3c2410_uartcfg) {                  \
2410                 .ucon           = S5PV210_UCON_DEFAULT,         \
2411                 .ufcon          = S5PV210_UFCON_DEFAULT,        \
2412                 .has_fracval    = 1,                            \
2413         }                                                       \
2414
2415 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2416         EXYNOS_COMMON_SERIAL_DRV_DATA,
2417         .fifosize = { 256, 64, 16, 16 },
2418 };
2419
2420 static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2421         EXYNOS_COMMON_SERIAL_DRV_DATA,
2422         .fifosize = { 64, 256, 16, 256 },
2423 };
2424
2425 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
2426 #define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
2427 #else
2428 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2429 #define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2430 #endif
2431
2432 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
2433         {
2434                 .name           = "s3c2410-uart",
2435                 .driver_data    = S3C2410_SERIAL_DRV_DATA,
2436         }, {
2437                 .name           = "s3c2412-uart",
2438                 .driver_data    = S3C2412_SERIAL_DRV_DATA,
2439         }, {
2440                 .name           = "s3c2440-uart",
2441                 .driver_data    = S3C2440_SERIAL_DRV_DATA,
2442         }, {
2443                 .name           = "s3c6400-uart",
2444                 .driver_data    = S3C6400_SERIAL_DRV_DATA,
2445         }, {
2446                 .name           = "s5pv210-uart",
2447                 .driver_data    = S5PV210_SERIAL_DRV_DATA,
2448         }, {
2449                 .name           = "exynos4210-uart",
2450                 .driver_data    = EXYNOS4210_SERIAL_DRV_DATA,
2451         }, {
2452                 .name           = "exynos5433-uart",
2453                 .driver_data    = EXYNOS5433_SERIAL_DRV_DATA,
2454         },
2455         { },
2456 };
2457 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2458
2459 #ifdef CONFIG_OF
2460 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2461         { .compatible = "samsung,s3c2410-uart",
2462                 .data = (void *)S3C2410_SERIAL_DRV_DATA },
2463         { .compatible = "samsung,s3c2412-uart",
2464                 .data = (void *)S3C2412_SERIAL_DRV_DATA },
2465         { .compatible = "samsung,s3c2440-uart",
2466                 .data = (void *)S3C2440_SERIAL_DRV_DATA },
2467         { .compatible = "samsung,s3c6400-uart",
2468                 .data = (void *)S3C6400_SERIAL_DRV_DATA },
2469         { .compatible = "samsung,s5pv210-uart",
2470                 .data = (void *)S5PV210_SERIAL_DRV_DATA },
2471         { .compatible = "samsung,exynos4210-uart",
2472                 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
2473         { .compatible = "samsung,exynos5433-uart",
2474                 .data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
2475         {},
2476 };
2477 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2478 #endif
2479
2480 static struct platform_driver samsung_serial_driver = {
2481         .probe          = s3c24xx_serial_probe,
2482         .remove         = s3c24xx_serial_remove,
2483         .id_table       = s3c24xx_serial_driver_ids,
2484         .driver         = {
2485                 .name   = "samsung-uart",
2486                 .pm     = SERIAL_SAMSUNG_PM_OPS,
2487                 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2488         },
2489 };
2490
2491 module_platform_driver(samsung_serial_driver);
2492
2493 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2494 /*
2495  * Early console.
2496  */
2497
2498 struct samsung_early_console_data {
2499         u32 txfull_mask;
2500 };
2501
2502 static void samsung_early_busyuart(struct uart_port *port)
2503 {
2504         while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2505                 ;
2506 }
2507
2508 static void samsung_early_busyuart_fifo(struct uart_port *port)
2509 {
2510         struct samsung_early_console_data *data = port->private_data;
2511
2512         while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2513                 ;
2514 }
2515
2516 static void samsung_early_putc(struct uart_port *port, int c)
2517 {
2518         if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2519                 samsung_early_busyuart_fifo(port);
2520         else
2521                 samsung_early_busyuart(port);
2522
2523         writeb(c, port->membase + S3C2410_UTXH);
2524 }
2525
2526 static void samsung_early_write(struct console *con, const char *s, unsigned n)
2527 {
2528         struct earlycon_device *dev = con->data;
2529
2530         uart_console_write(&dev->port, s, n, samsung_early_putc);
2531 }
2532
2533 static int __init samsung_early_console_setup(struct earlycon_device *device,
2534                                               const char *opt)
2535 {
2536         if (!device->port.membase)
2537                 return -ENODEV;
2538
2539         device->con->write = samsung_early_write;
2540         return 0;
2541 }
2542
2543 /* S3C2410 */
2544 static struct samsung_early_console_data s3c2410_early_console_data = {
2545         .txfull_mask = S3C2410_UFSTAT_TXFULL,
2546 };
2547
2548 static int __init s3c2410_early_console_setup(struct earlycon_device *device,
2549                                               const char *opt)
2550 {
2551         device->port.private_data = &s3c2410_early_console_data;
2552         return samsung_early_console_setup(device, opt);
2553 }
2554 OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
2555                         s3c2410_early_console_setup);
2556
2557 /* S3C2412, S3C2440, S3C64xx */
2558 static struct samsung_early_console_data s3c2440_early_console_data = {
2559         .txfull_mask = S3C2440_UFSTAT_TXFULL,
2560 };
2561
2562 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2563                                               const char *opt)
2564 {
2565         device->port.private_data = &s3c2440_early_console_data;
2566         return samsung_early_console_setup(device, opt);
2567 }
2568 OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
2569                         s3c2440_early_console_setup);
2570 OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
2571                         s3c2440_early_console_setup);
2572 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2573                         s3c2440_early_console_setup);
2574
2575 /* S5PV210, EXYNOS */
2576 static struct samsung_early_console_data s5pv210_early_console_data = {
2577         .txfull_mask = S5PV210_UFSTAT_TXFULL,
2578 };
2579
2580 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2581                                               const char *opt)
2582 {
2583         device->port.private_data = &s5pv210_early_console_data;
2584         return samsung_early_console_setup(device, opt);
2585 }
2586 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2587                         s5pv210_early_console_setup);
2588 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2589                         s5pv210_early_console_setup);
2590 #endif
2591
2592 MODULE_ALIAS("platform:samsung-uart");
2593 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2594 MODULE_AUTHOR("Ben Dooks <[email protected]>");
2595 MODULE_LICENSE("GPL v2");