drivers/tty/serial/samsung_tty.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 /* Note 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 #include <linux/dmaengine.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/slab.h>
  27 #include <linux/module.h>
  28 #include <linux/ioport.h>
  29 #include <linux/io.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/init.h>
  32 #include <linux/sysrq.h>
  33 #include <linux/console.h>
  34 #include <linux/tty.h>
  35 #include <linux/tty_flip.h>
  36 #include <linux/serial_core.h>
  37 #include <linux/serial.h>
  38 #include <linux/serial_s3c.h>
  39 #include <linux/delay.h>
  40 #include <linux/clk.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/of.h>
  43 #include <asm/irq.h>
  44
  45 /* UART name and device definitions */
  46
  47 #define S3C24XX_SERIAL_NAME     "ttySAC"
  48 #define S3C24XX_SERIAL_MAJOR    204
  49 #define S3C24XX_SERIAL_MINOR    64
  50
  51 #define S3C24XX_TX_PIO                  1
  52 #define S3C24XX_TX_DMA                  2
  53 #define S3C24XX_RX_PIO                  1
  54 #define S3C24XX_RX_DMA                  2
  55
  56 /* flag to ignore all characters coming in */
  57 #define RXSTAT_DUMMY_READ (0x10000000)
  58
  59 struct s3c24xx_uart_info {
  60         char                    *name;
  61         unsigned int            type;
  62         unsigned int            fifosize;
  63         unsigned long           rx_fifomask;
  64         unsigned long           rx_fifoshift;
  65         unsigned long           rx_fifofull;
  66         unsigned long           tx_fifomask;
  67         unsigned long           tx_fifoshift;
  68         unsigned long           tx_fifofull;
  69         unsigned int            def_clk_sel;
  70         unsigned long           num_clks;
  71         unsigned long           clksel_mask;
  72         unsigned long           clksel_shift;
  73
  74         /* uart port features */
  75
  76         unsigned int            has_divslot:1;
  77 };
  78
  79 struct s3c24xx_serial_drv_data {
  80         struct s3c24xx_uart_info        *info;
  81         struct s3c2410_uartcfg          *def_cfg;
  82         unsigned int                    fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
  83 };
  84
  85 struct s3c24xx_uart_dma {
  86         unsigned int                    rx_chan_id;
  87         unsigned int                    tx_chan_id;
  88
  89         struct dma_slave_config         rx_conf;
  90         struct dma_slave_config         tx_conf;
  91
  92         struct dma_chan                 *rx_chan;
  93         struct dma_chan                 *tx_chan;
  94
  95         dma_addr_t                      rx_addr;
  96         dma_addr_t                      tx_addr;
  97
  98         dma_cookie_t                    rx_cookie;
  99         dma_cookie_t                    tx_cookie;
 100
 101         char                            *rx_buf;
 102
 103         dma_addr_t                      tx_transfer_addr;
 104
 105         size_t                          rx_size;
 106         size_t                          tx_size;
 107
 108         struct dma_async_tx_descriptor  *tx_desc;
 109         struct dma_async_tx_descriptor  *rx_desc;
 110
 111         int                             tx_bytes_requested;
 112         int                             rx_bytes_requested;
 113 };
 114
 115 struct s3c24xx_uart_port {
 116         unsigned char                   rx_claimed;
 117         unsigned char                   tx_claimed;
 118         unsigned char                   rx_enabled;
 119         unsigned char                   tx_enabled;
 120         unsigned int                    pm_level;
 121         unsigned long                   baudclk_rate;
 122         unsigned int                    min_dma_size;
 123
 124         unsigned int                    rx_irq;
 125         unsigned int                    tx_irq;
 126
 127         unsigned int                    tx_in_progress;
 128         unsigned int                    tx_mode;
 129         unsigned int                    rx_mode;
 130
 131         struct s3c24xx_uart_info        *info;
 132         struct clk                      *clk;
 133         struct clk                      *baudclk;
 134         struct uart_port                port;
 135         struct s3c24xx_serial_drv_data  *drv_data;
 136
 137         /* reference to platform data */
 138         struct s3c2410_uartcfg          *cfg;
 139
 140         struct s3c24xx_uart_dma         *dma;
 141
 142 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ
 143         struct notifier_block           freq_transition;
 144 #endif
 145 };
 146
 147 /* conversion functions */
 148
 149 #define s3c24xx_dev_to_port(__dev) dev_get_drvdata(__dev)
 150
 151 /* register access controls */
 152
 153 #define portaddr(port, reg) ((port)->membase + (reg))
 154 #define portaddrl(port, reg) \
 155         ((unsigned long *)(unsigned long)((port)->membase + (reg)))
 156
 157 static u32 rd_reg(struct uart_port *port, u32 reg)
 158 {
 159         switch (port->iotype) {
 160         case UPIO_MEM:
 161                 return readb_relaxed(portaddr(port, reg));
 162         case UPIO_MEM32:
 163                 return readl_relaxed(portaddr(port, reg));
 164         default:
 165                 return 0;
 166         }
 167         return 0;
 168 }
 169
 170 #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
 171
 172 static void wr_reg(struct uart_port *port, u32 reg, u32 val)
 173 {
 174         switch (port->iotype) {
 175         case UPIO_MEM:
 176                 writeb_relaxed(val, portaddr(port, reg));
 177                 break;
 178         case UPIO_MEM32:
 179                 writel_relaxed(val, portaddr(port, reg));
 180                 break;
 181         }
 182 }
 183
 184 #define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port, reg))
 185
 186 /* Byte-order aware bit setting/clearing functions. */
 187
 188 static inline void s3c24xx_set_bit(struct uart_port *port, int idx,
 189                                    unsigned int reg)
 190 {
 191         unsigned long flags;
 192         u32 val;
 193
 194         local_irq_save(flags);
 195         val = rd_regl(port, reg);
 196         val |= (1 << idx);
 197         wr_regl(port, reg, val);
 198         local_irq_restore(flags);
 199 }
 200
 201 static inline void s3c24xx_clear_bit(struct uart_port *port, int idx,
 202                                      unsigned int reg)
 203 {
 204         unsigned long flags;
 205         u32 val;
 206
 207         local_irq_save(flags);
 208         val = rd_regl(port, reg);
 209         val &= ~(1 << idx);
 210         wr_regl(port, reg, val);
 211         local_irq_restore(flags);
 212 }
 213
 214 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
 215 {
 216         return container_of(port, struct s3c24xx_uart_port, port);
 217 }
 218
 219 /* translate a port to the device name */
 220
 221 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
 222 {
 223         return to_platform_device(port->dev)->name;
 224 }
 225
 226 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
 227 {
 228         return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
 229 }
 230
 231 /*
 232  * s3c64xx and later SoC's include the interrupt mask and status registers in
 233  * the controller itself, unlike the s3c24xx SoC's which have these registers
 234  * in the interrupt controller. Check if the port type is s3c64xx or higher.
 235  */
 236 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
 237 {
 238         return to_ourport(port)->info->type == PORT_S3C6400;
 239 }
 240
 241 static void s3c24xx_serial_rx_enable(struct uart_port *port)
 242 {
 243         struct s3c24xx_uart_port *ourport = to_ourport(port);
 244         unsigned long flags;
 245         unsigned int ucon, ufcon;
 246         int count = 10000;
 247
 248         spin_lock_irqsave(&port->lock, flags);
 249
 250         while (--count && !s3c24xx_serial_txempty_nofifo(port))
 251                 udelay(100);
 252
 253         ufcon = rd_regl(port, S3C2410_UFCON);
 254         ufcon |= S3C2410_UFCON_RESETRX;
 255         wr_regl(port, S3C2410_UFCON, ufcon);
 256
 257         ucon = rd_regl(port, S3C2410_UCON);
 258         ucon |= S3C2410_UCON_RXIRQMODE;
 259         wr_regl(port, S3C2410_UCON, ucon);
 260
 261         ourport->rx_enabled = 1;
 262         spin_unlock_irqrestore(&port->lock, flags);
 263 }
 264
 265 static void s3c24xx_serial_rx_disable(struct uart_port *port)
 266 {
 267         struct s3c24xx_uart_port *ourport = to_ourport(port);
 268         unsigned long flags;
 269         unsigned int ucon;
 270
 271         spin_lock_irqsave(&port->lock, flags);
 272
 273         ucon = rd_regl(port, S3C2410_UCON);
 274         ucon &= ~S3C2410_UCON_RXIRQMODE;
 275         wr_regl(port, S3C2410_UCON, ucon);
 276
 277         ourport->rx_enabled = 0;
 278         spin_unlock_irqrestore(&port->lock, flags);
 279 }
 280
 281 static void s3c24xx_serial_stop_tx(struct uart_port *port)
 282 {
 283         struct s3c24xx_uart_port *ourport = to_ourport(port);
 284         struct s3c24xx_uart_dma *dma = ourport->dma;
 285         struct circ_buf *xmit = &port->state->xmit;
 286         struct dma_tx_state state;
 287         int count;
 288
 289         if (!ourport->tx_enabled)
 290                 return;
 291
 292         if (s3c24xx_serial_has_interrupt_mask(port))
 293                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 294         else
 295                 disable_irq_nosync(ourport->tx_irq);
 296
 297         if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
 298                 dmaengine_pause(dma->tx_chan);
 299                 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 300                 dmaengine_terminate_all(dma->tx_chan);
 301                 dma_sync_single_for_cpu(ourport->port.dev,
 302                         dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
 303                 async_tx_ack(dma->tx_desc);
 304                 count = dma->tx_bytes_requested - state.residue;
 305                 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
 306                 port->icount.tx += count;
 307         }
 308
 309         ourport->tx_enabled = 0;
 310         ourport->tx_in_progress = 0;
 311
 312         if (port->flags & UPF_CONS_FLOW)
 313                 s3c24xx_serial_rx_enable(port);
 314
 315         ourport->tx_mode = 0;
 316 }
 317
 318 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
 319
 320 static void s3c24xx_serial_tx_dma_complete(void *args)
 321 {
 322         struct s3c24xx_uart_port *ourport = args;
 323         struct uart_port *port = &ourport->port;
 324         struct circ_buf *xmit = &port->state->xmit;
 325         struct s3c24xx_uart_dma *dma = ourport->dma;
 326         struct dma_tx_state state;
 327         unsigned long flags;
 328         int count;
 329
 330         dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 331         count = dma->tx_bytes_requested - state.residue;
 332         async_tx_ack(dma->tx_desc);
 333
 334         dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
 335                                 dma->tx_size, DMA_TO_DEVICE);
 336
 337         spin_lock_irqsave(&port->lock, flags);
 338
 339         xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
 340         port->icount.tx += count;
 341         ourport->tx_in_progress = 0;
 342
 343         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 344                 uart_write_wakeup(port);
 345
 346         s3c24xx_serial_start_next_tx(ourport);
 347         spin_unlock_irqrestore(&port->lock, flags);
 348 }
 349
 350 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
 351 {
 352         struct uart_port *port = &ourport->port;
 353         u32 ucon;
 354
 355         /* Mask Tx interrupt */
 356         if (s3c24xx_serial_has_interrupt_mask(port))
 357                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 358         else
 359                 disable_irq_nosync(ourport->tx_irq);
 360
 361         /* Enable tx dma mode */
 362         ucon = rd_regl(port, S3C2410_UCON);
 363         ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
 364         ucon |= (dma_get_cache_alignment() >= 16) ?
 365                 S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
 366         ucon |= S3C64XX_UCON_TXMODE_DMA;
 367         wr_regl(port,  S3C2410_UCON, ucon);
 368
 369         ourport->tx_mode = S3C24XX_TX_DMA;
 370 }
 371
 372 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
 373 {
 374         struct uart_port *port = &ourport->port;
 375         u32 ucon, ufcon;
 376
 377         /* Set ufcon txtrig */
 378         ourport->tx_in_progress = S3C24XX_TX_PIO;
 379         ufcon = rd_regl(port, S3C2410_UFCON);
 380         wr_regl(port,  S3C2410_UFCON, ufcon);
 381
 382         /* Enable tx pio mode */
 383         ucon = rd_regl(port, S3C2410_UCON);
 384         ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
 385         ucon |= S3C64XX_UCON_TXMODE_CPU;
 386         wr_regl(port,  S3C2410_UCON, ucon);
 387
 388         /* Unmask Tx interrupt */
 389         if (s3c24xx_serial_has_interrupt_mask(port))
 390                 s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
 391                                   S3C64XX_UINTM);
 392         else
 393                 enable_irq(ourport->tx_irq);
 394
 395         ourport->tx_mode = S3C24XX_TX_PIO;
 396 }
 397
 398 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
 399 {
 400         if (ourport->tx_mode != S3C24XX_TX_PIO)
 401                 enable_tx_pio(ourport);
 402 }
 403
 404 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
 405                                       unsigned int count)
 406 {
 407         struct uart_port *port = &ourport->port;
 408         struct circ_buf *xmit = &port->state->xmit;
 409         struct s3c24xx_uart_dma *dma = ourport->dma;
 410
 411         if (ourport->tx_mode != S3C24XX_TX_DMA)
 412                 enable_tx_dma(ourport);
 413
 414         dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
 415         dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
 416
 417         dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
 418                                 dma->tx_size, DMA_TO_DEVICE);
 419
 420         dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
 421                                 dma->tx_transfer_addr, dma->tx_size,
 422                                 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
 423         if (!dma->tx_desc) {
 424                 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
 425                 return -EIO;
 426         }
 427
 428         dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
 429         dma->tx_desc->callback_param = ourport;
 430         dma->tx_bytes_requested = dma->tx_size;
 431
 432         ourport->tx_in_progress = S3C24XX_TX_DMA;
 433         dma->tx_cookie = dmaengine_submit(dma->tx_desc);
 434         dma_async_issue_pending(dma->tx_chan);
 435         return 0;
 436 }
 437
 438 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
 439 {
 440         struct uart_port *port = &ourport->port;
 441         struct circ_buf *xmit = &port->state->xmit;
 442         unsigned long count;
 443
 444         /* Get data size up to the end of buffer */
 445         count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 446
 447         if (!count) {
 448                 s3c24xx_serial_stop_tx(port);
 449                 return;
 450         }
 451
 452         if (!ourport->dma || !ourport->dma->tx_chan ||
 453             count < ourport->min_dma_size ||
 454             xmit->tail & (dma_get_cache_alignment() - 1))
 455                 s3c24xx_serial_start_tx_pio(ourport);
 456         else
 457                 s3c24xx_serial_start_tx_dma(ourport, count);
 458 }
 459
 460 static void s3c24xx_serial_start_tx(struct uart_port *port)
 461 {
 462         struct s3c24xx_uart_port *ourport = to_ourport(port);
 463         struct circ_buf *xmit = &port->state->xmit;
 464
 465         if (!ourport->tx_enabled) {
 466                 if (port->flags & UPF_CONS_FLOW)
 467                         s3c24xx_serial_rx_disable(port);
 468
 469                 ourport->tx_enabled = 1;
 470                 if (!ourport->dma || !ourport->dma->tx_chan)
 471                         s3c24xx_serial_start_tx_pio(ourport);
 472         }
 473
 474         if (ourport->dma && ourport->dma->tx_chan) {
 475                 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
 476                         s3c24xx_serial_start_next_tx(ourport);
 477         }
 478 }
 479
 480 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
 481                 struct tty_port *tty, int count)
 482 {
 483         struct s3c24xx_uart_dma *dma = ourport->dma;
 484         int copied;
 485
 486         if (!count)
 487                 return;
 488
 489         dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
 490                                 dma->rx_size, DMA_FROM_DEVICE);
 491
 492         ourport->port.icount.rx += count;
 493         if (!tty) {
 494                 dev_err(ourport->port.dev, "No tty port\n");
 495                 return;
 496         }
 497         copied = tty_insert_flip_string(tty,
 498                         ((unsigned char *)(ourport->dma->rx_buf)), count);
 499         if (copied != count) {
 500                 WARN_ON(1);
 501                 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
 502         }
 503 }
 504
 505 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 506 {
 507         struct s3c24xx_uart_port *ourport = to_ourport(port);
 508         struct s3c24xx_uart_dma *dma = ourport->dma;
 509         struct tty_port *t = &port->state->port;
 510         struct dma_tx_state state;
 511         enum dma_status dma_status;
 512         unsigned int received;
 513
 514         if (ourport->rx_enabled) {
 515                 dev_dbg(port->dev, "stopping rx\n");
 516                 if (s3c24xx_serial_has_interrupt_mask(port))
 517                         s3c24xx_set_bit(port, S3C64XX_UINTM_RXD,
 518                                         S3C64XX_UINTM);
 519                 else
 520                         disable_irq_nosync(ourport->rx_irq);
 521                 ourport->rx_enabled = 0;
 522         }
 523         if (dma && dma->rx_chan) {
 524                 dmaengine_pause(dma->tx_chan);
 525                 dma_status = dmaengine_tx_status(dma->rx_chan,
 526                                 dma->rx_cookie, &state);
 527                 if (dma_status == DMA_IN_PROGRESS ||
 528                         dma_status == DMA_PAUSED) {
 529                         received = dma->rx_bytes_requested - state.residue;
 530                         dmaengine_terminate_all(dma->rx_chan);
 531                         s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 532                 }
 533         }
 534 }
 535
 536 static inline struct s3c24xx_uart_info
 537         *s3c24xx_port_to_info(struct uart_port *port)
 538 {
 539         return to_ourport(port)->info;
 540 }
 541
 542 static inline struct s3c2410_uartcfg
 543         *s3c24xx_port_to_cfg(struct uart_port *port)
 544 {
 545         struct s3c24xx_uart_port *ourport;
 546
 547         if (port->dev == NULL)
 548                 return NULL;
 549
 550         ourport = container_of(port, struct s3c24xx_uart_port, port);
 551         return ourport->cfg;
 552 }
 553
 554 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
 555                                      unsigned long ufstat)
 556 {
 557         struct s3c24xx_uart_info *info = ourport->info;
 558
 559         if (ufstat & info->rx_fifofull)
 560                 return ourport->port.fifosize;
 561
 562         return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
 563 }
 564
 565 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
 566 static void s3c24xx_serial_rx_dma_complete(void *args)
 567 {
 568         struct s3c24xx_uart_port *ourport = args;
 569         struct uart_port *port = &ourport->port;
 570
 571         struct s3c24xx_uart_dma *dma = ourport->dma;
 572         struct tty_port *t = &port->state->port;
 573         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 574
 575         struct dma_tx_state state;
 576         unsigned long flags;
 577         int received;
 578
 579         dmaengine_tx_status(dma->rx_chan,  dma->rx_cookie, &state);
 580         received  = dma->rx_bytes_requested - state.residue;
 581         async_tx_ack(dma->rx_desc);
 582
 583         spin_lock_irqsave(&port->lock, flags);
 584
 585         if (received)
 586                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 587
 588         if (tty) {
 589                 tty_flip_buffer_push(t);
 590                 tty_kref_put(tty);
 591         }
 592
 593         s3c64xx_start_rx_dma(ourport);
 594
 595         spin_unlock_irqrestore(&port->lock, flags);
 596 }
 597
 598 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
 599 {
 600         struct s3c24xx_uart_dma *dma = ourport->dma;
 601
 602         dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
 603                                 dma->rx_size, DMA_FROM_DEVICE);
 604
 605         dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
 606                                 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
 607                                 DMA_PREP_INTERRUPT);
 608         if (!dma->rx_desc) {
 609                 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
 610                 return;
 611         }
 612
 613         dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
 614         dma->rx_desc->callback_param = ourport;
 615         dma->rx_bytes_requested = dma->rx_size;
 616
 617         dma->rx_cookie = dmaengine_submit(dma->rx_desc);
 618         dma_async_issue_pending(dma->rx_chan);
 619 }
 620
 621 /* ? - where has parity gone?? */
 622 #define S3C2410_UERSTAT_PARITY (0x1000)
 623
 624 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
 625 {
 626         struct uart_port *port = &ourport->port;
 627         unsigned int ucon;
 628
 629         /* set Rx mode to DMA mode */
 630         ucon = rd_regl(port, S3C2410_UCON);
 631         ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
 632                         S3C64XX_UCON_TIMEOUT_MASK |
 633                         S3C64XX_UCON_EMPTYINT_EN |
 634                         S3C64XX_UCON_DMASUS_EN |
 635                         S3C64XX_UCON_TIMEOUT_EN |
 636                         S3C64XX_UCON_RXMODE_MASK);
 637         ucon |= S3C64XX_UCON_RXBURST_16 |
 638                         0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 639                         S3C64XX_UCON_EMPTYINT_EN |
 640                         S3C64XX_UCON_TIMEOUT_EN |
 641                         S3C64XX_UCON_RXMODE_DMA;
 642         wr_regl(port, S3C2410_UCON, ucon);
 643
 644         ourport->rx_mode = S3C24XX_RX_DMA;
 645 }
 646
 647 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
 648 {
 649         struct uart_port *port = &ourport->port;
 650         unsigned int ucon;
 651
 652         /* set Rx mode to DMA mode */
 653         ucon = rd_regl(port, S3C2410_UCON);
 654         ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
 655                         S3C64XX_UCON_EMPTYINT_EN |
 656                         S3C64XX_UCON_DMASUS_EN |
 657                         S3C64XX_UCON_TIMEOUT_EN |
 658                         S3C64XX_UCON_RXMODE_MASK);
 659         ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 660                         S3C64XX_UCON_TIMEOUT_EN |
 661                         S3C64XX_UCON_RXMODE_CPU;
 662         wr_regl(port, S3C2410_UCON, ucon);
 663
 664         ourport->rx_mode = S3C24XX_RX_PIO;
 665 }
 666
 667 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
 668
 669 static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
 670 {
 671         unsigned int utrstat, received;
 672         struct s3c24xx_uart_port *ourport = dev_id;
 673         struct uart_port *port = &ourport->port;
 674         struct s3c24xx_uart_dma *dma = ourport->dma;
 675         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 676         struct tty_port *t = &port->state->port;
 677         unsigned long flags;
 678         struct dma_tx_state state;
 679
 680         utrstat = rd_regl(port, S3C2410_UTRSTAT);
 681         rd_regl(port, S3C2410_UFSTAT);
 682
 683         spin_lock_irqsave(&port->lock, flags);
 684
 685         if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
 686                 s3c64xx_start_rx_dma(ourport);
 687                 if (ourport->rx_mode == S3C24XX_RX_PIO)
 688                         enable_rx_dma(ourport);
 689                 goto finish;
 690         }
 691
 692         if (ourport->rx_mode == S3C24XX_RX_DMA) {
 693                 dmaengine_pause(dma->rx_chan);
 694                 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
 695                 dmaengine_terminate_all(dma->rx_chan);
 696                 received = dma->rx_bytes_requested - state.residue;
 697                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 698
 699                 enable_rx_pio(ourport);
 700         }
 701
 702         s3c24xx_serial_rx_drain_fifo(ourport);
 703
 704         if (tty) {
 705                 tty_flip_buffer_push(t);
 706                 tty_kref_put(tty);
 707         }
 708
 709         wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
 710
 711 finish:
 712         spin_unlock_irqrestore(&port->lock, flags);
 713
 714         return IRQ_HANDLED;
 715 }
 716
 717 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
 718 {
 719         struct uart_port *port = &ourport->port;
 720         unsigned int ufcon, ch, flag, ufstat, uerstat;
 721         unsigned int fifocnt = 0;
 722         int max_count = port->fifosize;
 723
 724         while (max_count-- > 0) {
 725                 /*
 726                  * Receive all characters known to be in FIFO
 727                  * before reading FIFO level again
 728                  */
 729                 if (fifocnt == 0) {
 730                         ufstat = rd_regl(port, S3C2410_UFSTAT);
 731                         fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
 732                         if (fifocnt == 0)
 733                                 break;
 734                 }
 735                 fifocnt--;
 736
 737                 uerstat = rd_regl(port, S3C2410_UERSTAT);
 738                 ch = rd_reg(port, S3C2410_URXH);
 739
 740                 if (port->flags & UPF_CONS_FLOW) {
 741                         int txe = s3c24xx_serial_txempty_nofifo(port);
 742
 743                         if (ourport->rx_enabled) {
 744                                 if (!txe) {
 745                                         ourport->rx_enabled = 0;
 746                                         continue;
 747                                 }
 748                         } else {
 749                                 if (txe) {
 750                                         ufcon = rd_regl(port, S3C2410_UFCON);
 751                                         ufcon |= S3C2410_UFCON_RESETRX;
 752                                         wr_regl(port, S3C2410_UFCON, ufcon);
 753                                         ourport->rx_enabled = 1;
 754                                         return;
 755                                 }
 756                                 continue;
 757                         }
 758                 }
 759
 760                 /* insert the character into the buffer */
 761
 762                 flag = TTY_NORMAL;
 763                 port->icount.rx++;
 764
 765                 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
 766                         dev_dbg(port->dev,
 767                                 "rxerr: port ch=0x%02x, rxs=0x%08x\n",
 768                                 ch, uerstat);
 769
 770                         /* check for break */
 771                         if (uerstat & S3C2410_UERSTAT_BREAK) {
 772                                 dev_dbg(port->dev, "break!\n");
 773                                 port->icount.brk++;
 774                                 if (uart_handle_break(port))
 775                                         continue; /* Ignore character */
 776                         }
 777
 778                         if (uerstat & S3C2410_UERSTAT_FRAME)
 779                                 port->icount.frame++;
 780                         if (uerstat & S3C2410_UERSTAT_OVERRUN)
 781                                 port->icount.overrun++;
 782
 783                         uerstat &= port->read_status_mask;
 784
 785                         if (uerstat & S3C2410_UERSTAT_BREAK)
 786                                 flag = TTY_BREAK;
 787                         else if (uerstat & S3C2410_UERSTAT_PARITY)
 788                                 flag = TTY_PARITY;
 789                         else if (uerstat & (S3C2410_UERSTAT_FRAME |
 790                                             S3C2410_UERSTAT_OVERRUN))
 791                                 flag = TTY_FRAME;
 792                 }
 793
 794                 if (uart_handle_sysrq_char(port, ch))
 795                         continue; /* Ignore character */
 796
 797                 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
 798                                  ch, flag);
 799         }
 800
 801         tty_flip_buffer_push(&port->state->port);
 802 }
 803
 804 static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
 805 {
 806         struct s3c24xx_uart_port *ourport = dev_id;
 807         struct uart_port *port = &ourport->port;
 808         unsigned long flags;
 809
 810         spin_lock_irqsave(&port->lock, flags);
 811         s3c24xx_serial_rx_drain_fifo(ourport);
 812         spin_unlock_irqrestore(&port->lock, flags);
 813
 814         return IRQ_HANDLED;
 815 }
 816
 817 static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
 818 {
 819         struct s3c24xx_uart_port *ourport = dev_id;
 820
 821         if (ourport->dma && ourport->dma->rx_chan)
 822                 return s3c24xx_serial_rx_chars_dma(dev_id);
 823         return s3c24xx_serial_rx_chars_pio(dev_id);
 824 }
 825
 826 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 827 {
 828         struct s3c24xx_uart_port *ourport = id;
 829         struct uart_port *port = &ourport->port;
 830         struct circ_buf *xmit = &port->state->xmit;
 831         unsigned long flags;
 832         int count, dma_count = 0;
 833
 834         spin_lock_irqsave(&port->lock, flags);
 835
 836         count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 837
 838         if (ourport->dma && ourport->dma->tx_chan &&
 839             count >= ourport->min_dma_size) {
 840                 int align = dma_get_cache_alignment() -
 841                         (xmit->tail & (dma_get_cache_alignment() - 1));
 842                 if (count - align >= ourport->min_dma_size) {
 843                         dma_count = count - align;
 844                         count = align;
 845                 }
 846         }
 847
 848         if (port->x_char) {
 849                 wr_reg(port, S3C2410_UTXH, port->x_char);
 850                 port->icount.tx++;
 851                 port->x_char = 0;
 852                 goto out;
 853         }
 854
 855         /* if there isn't anything more to transmit, or the uart is now
 856          * stopped, disable the uart and exit
 857          */
 858
 859         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 860                 s3c24xx_serial_stop_tx(port);
 861                 goto out;
 862         }
 863
 864         /* try and drain the buffer... */
 865
 866         if (count > port->fifosize) {
 867                 count = port->fifosize;
 868                 dma_count = 0;
 869         }
 870
 871         while (!uart_circ_empty(xmit) && count > 0) {
 872                 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
 873                         break;
 874
 875                 wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
 876                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 877                 port->icount.tx++;
 878                 count--;
 879         }
 880
 881         if (!count && dma_count) {
 882                 s3c24xx_serial_start_tx_dma(ourport, dma_count);
 883                 goto out;
 884         }
 885
 886         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
 887                 spin_unlock(&port->lock);
 888                 uart_write_wakeup(port);
 889                 spin_lock(&port->lock);
 890         }
 891
 892         if (uart_circ_empty(xmit))
 893                 s3c24xx_serial_stop_tx(port);
 894
 895 out:
 896         spin_unlock_irqrestore(&port->lock, flags);
 897         return IRQ_HANDLED;
 898 }
 899
 900 /* interrupt handler for s3c64xx and later SoC's.*/
 901 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
 902 {
 903         struct s3c24xx_uart_port *ourport = id;
 904         struct uart_port *port = &ourport->port;
 905         unsigned int pend = rd_regl(port, S3C64XX_UINTP);
 906         irqreturn_t ret = IRQ_HANDLED;
 907
 908         if (pend & S3C64XX_UINTM_RXD_MSK) {
 909                 ret = s3c24xx_serial_rx_chars(irq, id);
 910                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
 911         }
 912         if (pend & S3C64XX_UINTM_TXD_MSK) {
 913                 ret = s3c24xx_serial_tx_chars(irq, id);
 914                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
 915         }
 916         return ret;
 917 }
 918
 919 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 920 {
 921         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 922         unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
 923         unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
 924
 925         if (ufcon & S3C2410_UFCON_FIFOMODE) {
 926                 if ((ufstat & info->tx_fifomask) != 0 ||
 927                     (ufstat & info->tx_fifofull))
 928                         return 0;
 929
 930                 return 1;
 931         }
 932
 933         return s3c24xx_serial_txempty_nofifo(port);
 934 }
 935
 936 /* no modem control lines */
 937 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
 938 {
 939         unsigned int umstat = rd_reg(port, S3C2410_UMSTAT);
 940
 941         if (umstat & S3C2410_UMSTAT_CTS)
 942                 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 943         else
 944                 return TIOCM_CAR | TIOCM_DSR;
 945 }
 946
 947 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 948 {
 949         unsigned int umcon = rd_regl(port, S3C2410_UMCON);
 950
 951         if (mctrl & TIOCM_RTS)
 952                 umcon |= S3C2410_UMCOM_RTS_LOW;
 953         else
 954                 umcon &= ~S3C2410_UMCOM_RTS_LOW;
 955
 956         wr_regl(port, S3C2410_UMCON, umcon);
 957 }
 958
 959 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
 960 {
 961         unsigned long flags;
 962         unsigned int ucon;
 963
 964         spin_lock_irqsave(&port->lock, flags);
 965
 966         ucon = rd_regl(port, S3C2410_UCON);
 967
 968         if (break_state)
 969                 ucon |= S3C2410_UCON_SBREAK;
 970         else
 971                 ucon &= ~S3C2410_UCON_SBREAK;
 972
 973         wr_regl(port, S3C2410_UCON, ucon);
 974
 975         spin_unlock_irqrestore(&port->lock, flags);
 976 }
 977
 978 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
 979 {
 980         struct s3c24xx_uart_dma *dma = p->dma;
 981         struct dma_slave_caps dma_caps;
 982         const char *reason = NULL;
 983         int ret;
 984
 985         /* Default slave configuration parameters */
 986         dma->rx_conf.direction          = DMA_DEV_TO_MEM;
 987         dma->rx_conf.src_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
 988         dma->rx_conf.src_addr           = p->port.mapbase + S3C2410_URXH;
 989         dma->rx_conf.src_maxburst       = 1;
 990
 991         dma->tx_conf.direction          = DMA_MEM_TO_DEV;
 992         dma->tx_conf.dst_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
 993         dma->tx_conf.dst_addr           = p->port.mapbase + S3C2410_UTXH;
 994         dma->tx_conf.dst_maxburst       = 1;
 995
 996         dma->rx_chan = dma_request_chan(p->port.dev, "rx");
 997
 998         if (IS_ERR(dma->rx_chan)) {
 999                 reason = "DMA RX channel request failed";
1000                 ret = PTR_ERR(dma->rx_chan);
1001                 goto err_warn;
1002         }
1003
1004         ret = dma_get_slave_caps(dma->rx_chan, &dma_caps);
1005         if (ret < 0 ||
1006             dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
1007                 reason = "insufficient DMA RX engine capabilities";
1008                 ret = -EOPNOTSUPP;
1009                 goto err_release_rx;
1010         }
1011
1012         dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
1013
1014         dma->tx_chan = dma_request_chan(p->port.dev, "tx");
1015         if (IS_ERR(dma->tx_chan)) {
1016                 reason = "DMA TX channel request failed";
1017                 ret = PTR_ERR(dma->tx_chan);
1018                 goto err_release_rx;
1019         }
1020
1021         ret = dma_get_slave_caps(dma->tx_chan, &dma_caps);
1022         if (ret < 0 ||
1023             dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
1024                 reason = "insufficient DMA TX engine capabilities";
1025                 ret = -EOPNOTSUPP;
1026                 goto err_release_tx;
1027         }
1028
1029         dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
1030
1031         /* RX buffer */
1032         dma->rx_size = PAGE_SIZE;
1033
1034         dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
1035         if (!dma->rx_buf) {
1036                 ret = -ENOMEM;
1037                 goto err_release_tx;
1038         }
1039
1040         dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf,
1041                                 dma->rx_size, DMA_FROM_DEVICE);
1042         if (dma_mapping_error(p->port.dev, dma->rx_addr)) {
1043                 reason = "DMA mapping error for RX buffer";
1044                 ret = -EIO;
1045                 goto err_free_rx;
1046         }
1047
1048         /* TX buffer */
1049         dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf,
1050                                 UART_XMIT_SIZE, DMA_TO_DEVICE);
1051         if (dma_mapping_error(p->port.dev, dma->tx_addr)) {
1052                 reason = "DMA mapping error for TX buffer";
1053                 ret = -EIO;
1054                 goto err_unmap_rx;
1055         }
1056
1057         return 0;
1058
1059 err_unmap_rx:
1060         dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size,
1061                          DMA_FROM_DEVICE);
1062 err_free_rx:
1063         kfree(dma->rx_buf);
1064 err_release_tx:
1065         dma_release_channel(dma->tx_chan);
1066 err_release_rx:
1067         dma_release_channel(dma->rx_chan);
1068 err_warn:
1069         if (reason)
1070                 dev_warn(p->port.dev, "%s, DMA will not be used\n", reason);
1071         return ret;
1072 }
1073
1074 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
1075 {
1076         struct s3c24xx_uart_dma *dma = p->dma;
1077
1078         if (dma->rx_chan) {
1079                 dmaengine_terminate_all(dma->rx_chan);
1080                 dma_unmap_single(p->port.dev, dma->rx_addr,
1081                                 dma->rx_size, DMA_FROM_DEVICE);
1082                 kfree(dma->rx_buf);
1083                 dma_release_channel(dma->rx_chan);
1084                 dma->rx_chan = NULL;
1085         }
1086
1087         if (dma->tx_chan) {
1088                 dmaengine_terminate_all(dma->tx_chan);
1089                 dma_unmap_single(p->port.dev, dma->tx_addr,
1090                                 UART_XMIT_SIZE, DMA_TO_DEVICE);
1091                 dma_release_channel(dma->tx_chan);
1092                 dma->tx_chan = NULL;
1093         }
1094 }
1095
1096 static void s3c24xx_serial_shutdown(struct uart_port *port)
1097 {
1098         struct s3c24xx_uart_port *ourport = to_ourport(port);
1099
1100         if (ourport->tx_claimed) {
1101                 if (!s3c24xx_serial_has_interrupt_mask(port))
1102                         free_irq(ourport->tx_irq, ourport);
1103                 ourport->tx_enabled = 0;
1104                 ourport->tx_claimed = 0;
1105                 ourport->tx_mode = 0;
1106         }
1107
1108         if (ourport->rx_claimed) {
1109                 if (!s3c24xx_serial_has_interrupt_mask(port))
1110                         free_irq(ourport->rx_irq, ourport);
1111                 ourport->rx_claimed = 0;
1112                 ourport->rx_enabled = 0;
1113         }
1114
1115         /* Clear pending interrupts and mask all interrupts */
1116         if (s3c24xx_serial_has_interrupt_mask(port)) {
1117                 free_irq(port->irq, ourport);
1118
1119                 wr_regl(port, S3C64XX_UINTP, 0xf);
1120                 wr_regl(port, S3C64XX_UINTM, 0xf);
1121         }
1122
1123         if (ourport->dma)
1124                 s3c24xx_serial_release_dma(ourport);
1125
1126         ourport->tx_in_progress = 0;
1127 }
1128
1129 static int s3c24xx_serial_startup(struct uart_port *port)
1130 {
1131         struct s3c24xx_uart_port *ourport = to_ourport(port);
1132         int ret;
1133
1134         ourport->rx_enabled = 1;
1135
1136         ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
1137                           s3c24xx_serial_portname(port), ourport);
1138
1139         if (ret != 0) {
1140                 dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
1141                 return ret;
1142         }
1143
1144         ourport->rx_claimed = 1;
1145
1146         dev_dbg(port->dev, "requesting tx irq...\n");
1147
1148         ourport->tx_enabled = 1;
1149
1150         ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
1151                           s3c24xx_serial_portname(port), ourport);
1152
1153         if (ret) {
1154                 dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
1155                 goto err;
1156         }
1157
1158         ourport->tx_claimed = 1;
1159
1160         /* the port reset code should have done the correct
1161          * register setup for the port controls
1162          */
1163
1164         return ret;
1165
1166 err:
1167         s3c24xx_serial_shutdown(port);
1168         return ret;
1169 }
1170
1171 static int s3c64xx_serial_startup(struct uart_port *port)
1172 {
1173         struct s3c24xx_uart_port *ourport = to_ourport(port);
1174         unsigned long flags;
1175         unsigned int ufcon;
1176         int ret;
1177
1178         wr_regl(port, S3C64XX_UINTM, 0xf);
1179         if (ourport->dma) {
1180                 ret = s3c24xx_serial_request_dma(ourport);
1181                 if (ret < 0) {
1182                         devm_kfree(port->dev, ourport->dma);
1183                         ourport->dma = NULL;
1184                 }
1185         }
1186
1187         ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1188                           s3c24xx_serial_portname(port), ourport);
1189         if (ret) {
1190                 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1191                 return ret;
1192         }
1193
1194         /* For compatibility with s3c24xx Soc's */
1195         ourport->rx_enabled = 1;
1196         ourport->rx_claimed = 1;
1197         ourport->tx_enabled = 0;
1198         ourport->tx_claimed = 1;
1199
1200         spin_lock_irqsave(&port->lock, flags);
1201
1202         ufcon = rd_regl(port, S3C2410_UFCON);
1203         ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1204         if (!uart_console(port))
1205                 ufcon |= S3C2410_UFCON_RESETTX;
1206         wr_regl(port, S3C2410_UFCON, ufcon);
1207
1208         enable_rx_pio(ourport);
1209
1210         spin_unlock_irqrestore(&port->lock, flags);
1211
1212         /* Enable Rx Interrupt */
1213         s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM);
1214
1215         return ret;
1216 }
1217
1218 /* power power management control */
1219
1220 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1221                               unsigned int old)
1222 {
1223         struct s3c24xx_uart_port *ourport = to_ourport(port);
1224         int timeout = 10000;
1225
1226         ourport->pm_level = level;
1227
1228         switch (level) {
1229         case 3:
1230                 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1231                         udelay(100);
1232
1233                 if (!IS_ERR(ourport->baudclk))
1234                         clk_disable_unprepare(ourport->baudclk);
1235
1236                 clk_disable_unprepare(ourport->clk);
1237                 break;
1238
1239         case 0:
1240                 clk_prepare_enable(ourport->clk);
1241
1242                 if (!IS_ERR(ourport->baudclk))
1243                         clk_prepare_enable(ourport->baudclk);
1244
1245                 break;
1246         default:
1247                 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1248         }
1249 }
1250
1251 /* baud rate calculation
1252  *
1253  * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1254  * of different sources, including the peripheral clock ("pclk") and an
1255  * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1256  * with a programmable extra divisor.
1257  *
1258  * The following code goes through the clock sources, and calculates the
1259  * baud clocks (and the resultant actual baud rates) and then tries to
1260  * pick the closest one and select that.
1261  *
1262  */
1263
1264 #define MAX_CLK_NAME_LENGTH 15
1265
1266 static inline int s3c24xx_serial_getsource(struct uart_port *port)
1267 {
1268         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1269         unsigned int ucon;
1270
1271         if (info->num_clks == 1)
1272                 return 0;
1273
1274         ucon = rd_regl(port, S3C2410_UCON);
1275         ucon &= info->clksel_mask;
1276         return ucon >> info->clksel_shift;
1277 }
1278
1279 static void s3c24xx_serial_setsource(struct uart_port *port,
1280                         unsigned int clk_sel)
1281 {
1282         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1283         unsigned int ucon;
1284
1285         if (info->num_clks == 1)
1286                 return;
1287
1288         ucon = rd_regl(port, S3C2410_UCON);
1289         if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1290                 return;
1291
1292         ucon &= ~info->clksel_mask;
1293         ucon |= clk_sel << info->clksel_shift;
1294         wr_regl(port, S3C2410_UCON, ucon);
1295 }
1296
1297 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1298                         unsigned int req_baud, struct clk **best_clk,
1299                         unsigned int *clk_num)
1300 {
1301         struct s3c24xx_uart_info *info = ourport->info;
1302         struct clk *clk;
1303         unsigned long rate;
1304         unsigned int cnt, baud, quot, best_quot = 0;
1305         char clkname[MAX_CLK_NAME_LENGTH];
1306         int calc_deviation, deviation = (1 << 30) - 1;
1307
1308         for (cnt = 0; cnt < info->num_clks; cnt++) {
1309                 /* Keep selected clock if provided */
1310                 if (ourport->cfg->clk_sel &&
1311                         !(ourport->cfg->clk_sel & (1 << cnt)))
1312                         continue;
1313
1314                 sprintf(clkname, "clk_uart_baud%d", cnt);
1315                 clk = clk_get(ourport->port.dev, clkname);
1316                 if (IS_ERR(clk))
1317                         continue;
1318
1319                 rate = clk_get_rate(clk);
1320                 if (!rate)
1321                         continue;
1322
1323                 if (ourport->info->has_divslot) {
1324                         unsigned long div = rate / req_baud;
1325
1326                         /* The UDIVSLOT register on the newer UARTs allows us to
1327                          * get a divisor adjustment of 1/16th on the baud clock.
1328                          *
1329                          * We don't keep the UDIVSLOT value (the 16ths we
1330                          * calculated by not multiplying the baud by 16) as it
1331                          * is easy enough to recalculate.
1332                          */
1333
1334                         quot = div / 16;
1335                         baud = rate / div;
1336                 } else {
1337                         quot = (rate + (8 * req_baud)) / (16 * req_baud);
1338                         baud = rate / (quot * 16);
1339                 }
1340                 quot--;
1341
1342                 calc_deviation = req_baud - baud;
1343                 if (calc_deviation < 0)
1344                         calc_deviation = -calc_deviation;
1345
1346                 if (calc_deviation < deviation) {
1347                         *best_clk = clk;
1348                         best_quot = quot;
1349                         *clk_num = cnt;
1350                         deviation = calc_deviation;
1351                 }
1352         }
1353
1354         return best_quot;
1355 }
1356
1357 /* udivslot_table[]
1358  *
1359  * This table takes the fractional value of the baud divisor and gives
1360  * the recommended setting for the UDIVSLOT register.
1361  */
1362 static u16 udivslot_table[16] = {
1363         [0] = 0x0000,
1364         [1] = 0x0080,
1365         [2] = 0x0808,
1366         [3] = 0x0888,
1367         [4] = 0x2222,
1368         [5] = 0x4924,
1369         [6] = 0x4A52,
1370         [7] = 0x54AA,
1371         [8] = 0x5555,
1372         [9] = 0xD555,
1373         [10] = 0xD5D5,
1374         [11] = 0xDDD5,
1375         [12] = 0xDDDD,
1376         [13] = 0xDFDD,
1377         [14] = 0xDFDF,
1378         [15] = 0xFFDF,
1379 };
1380
1381 static void s3c24xx_serial_set_termios(struct uart_port *port,
1382                                        struct ktermios *termios,
1383                                        struct ktermios *old)
1384 {
1385         struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1386         struct s3c24xx_uart_port *ourport = to_ourport(port);
1387         struct clk *clk = ERR_PTR(-EINVAL);
1388         unsigned long flags;
1389         unsigned int baud, quot, clk_sel = 0;
1390         unsigned int ulcon;
1391         unsigned int umcon;
1392         unsigned int udivslot = 0;
1393
1394         /*
1395          * We don't support modem control lines.
1396          */
1397         termios->c_cflag &= ~(HUPCL | CMSPAR);
1398         termios->c_cflag |= CLOCAL;
1399
1400         /*
1401          * Ask the core to calculate the divisor for us.
1402          */
1403
1404         baud = uart_get_baud_rate(port, termios, old, 0, 3000000);
1405         quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1406         if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1407                 quot = port->custom_divisor;
1408         if (IS_ERR(clk))
1409                 return;
1410
1411         /* check to see if we need  to change clock source */
1412
1413         if (ourport->baudclk != clk) {
1414                 clk_prepare_enable(clk);
1415
1416                 s3c24xx_serial_setsource(port, clk_sel);
1417
1418                 if (!IS_ERR(ourport->baudclk)) {
1419                         clk_disable_unprepare(ourport->baudclk);
1420                         ourport->baudclk = ERR_PTR(-EINVAL);
1421                 }
1422
1423                 ourport->baudclk = clk;
1424                 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1425         }
1426
1427         if (ourport->info->has_divslot) {
1428                 unsigned int div = ourport->baudclk_rate / baud;
1429
1430                 if (cfg->has_fracval) {
1431                         udivslot = (div & 15);
1432                         dev_dbg(port->dev, "fracval = %04x\n", udivslot);
1433                 } else {
1434                         udivslot = udivslot_table[div & 15];
1435                         dev_dbg(port->dev, "udivslot = %04x (div %d)\n",
1436                                 udivslot, div & 15);
1437                 }
1438         }
1439
1440         switch (termios->c_cflag & CSIZE) {
1441         case CS5:
1442                 dev_dbg(port->dev, "config: 5bits/char\n");
1443                 ulcon = S3C2410_LCON_CS5;
1444                 break;
1445         case CS6:
1446                 dev_dbg(port->dev, "config: 6bits/char\n");
1447                 ulcon = S3C2410_LCON_CS6;
1448                 break;
1449         case CS7:
1450                 dev_dbg(port->dev, "config: 7bits/char\n");
1451                 ulcon = S3C2410_LCON_CS7;
1452                 break;
1453         case CS8:
1454         default:
1455                 dev_dbg(port->dev, "config: 8bits/char\n");
1456                 ulcon = S3C2410_LCON_CS8;
1457                 break;
1458         }
1459
1460         /* preserve original lcon IR settings */
1461         ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1462
1463         if (termios->c_cflag & CSTOPB)
1464                 ulcon |= S3C2410_LCON_STOPB;
1465
1466         if (termios->c_cflag & PARENB) {
1467                 if (termios->c_cflag & PARODD)
1468                         ulcon |= S3C2410_LCON_PODD;
1469                 else
1470                         ulcon |= S3C2410_LCON_PEVEN;
1471         } else {
1472                 ulcon |= S3C2410_LCON_PNONE;
1473         }
1474
1475         spin_lock_irqsave(&port->lock, flags);
1476
1477         dev_dbg(port->dev,
1478                 "setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1479                 ulcon, quot, udivslot);
1480
1481         wr_regl(port, S3C2410_ULCON, ulcon);
1482         wr_regl(port, S3C2410_UBRDIV, quot);
1483
1484         port->status &= ~UPSTAT_AUTOCTS;
1485
1486         umcon = rd_regl(port, S3C2410_UMCON);
1487         if (termios->c_cflag & CRTSCTS) {
1488                 umcon |= S3C2410_UMCOM_AFC;
1489                 /* Disable RTS when RX FIFO contains 63 bytes */
1490                 umcon &= ~S3C2412_UMCON_AFC_8;
1491                 port->status = UPSTAT_AUTOCTS;
1492         } else {
1493                 umcon &= ~S3C2410_UMCOM_AFC;
1494         }
1495         wr_regl(port, S3C2410_UMCON, umcon);
1496
1497         if (ourport->info->has_divslot)
1498                 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1499
1500         dev_dbg(port->dev,
1501                 "uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1502                 rd_regl(port, S3C2410_ULCON),
1503                 rd_regl(port, S3C2410_UCON),
1504                 rd_regl(port, S3C2410_UFCON));
1505
1506         /*
1507          * Update the per-port timeout.
1508          */
1509         uart_update_timeout(port, termios->c_cflag, baud);
1510
1511         /*
1512          * Which character status flags are we interested in?
1513          */
1514         port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1515         if (termios->c_iflag & INPCK)
1516                 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1517                         S3C2410_UERSTAT_PARITY;
1518         /*
1519          * Which character status flags should we ignore?
1520          */
1521         port->ignore_status_mask = 0;
1522         if (termios->c_iflag & IGNPAR)
1523                 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1524         if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1525                 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1526
1527         /*
1528          * Ignore all characters if CREAD is not set.
1529          */
1530         if ((termios->c_cflag & CREAD) == 0)
1531                 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1532
1533         spin_unlock_irqrestore(&port->lock, flags);
1534 }
1535
1536 static const char *s3c24xx_serial_type(struct uart_port *port)
1537 {
1538         switch (port->type) {
1539         case PORT_S3C2410:
1540                 return "S3C2410";
1541         case PORT_S3C2440:
1542                 return "S3C2440";
1543         case PORT_S3C2412:
1544                 return "S3C2412";
1545         case PORT_S3C6400:
1546                 return "S3C6400/10";
1547         default:
1548                 return NULL;
1549         }
1550 }
1551
1552 #define MAP_SIZE (0x100)
1553
1554 static void s3c24xx_serial_release_port(struct uart_port *port)
1555 {
1556         release_mem_region(port->mapbase, MAP_SIZE);
1557 }
1558
1559 static int s3c24xx_serial_request_port(struct uart_port *port)
1560 {
1561         const char *name = s3c24xx_serial_portname(port);
1562
1563         return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
1564 }
1565
1566 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1567 {
1568         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1569
1570         if (flags & UART_CONFIG_TYPE &&
1571             s3c24xx_serial_request_port(port) == 0)
1572                 port->type = info->type;
1573 }
1574
1575 /*
1576  * verify the new serial_struct (for TIOCSSERIAL).
1577  */
1578 static int
1579 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1580 {
1581         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1582
1583         if (ser->type != PORT_UNKNOWN && ser->type != info->type)
1584                 return -EINVAL;
1585
1586         return 0;
1587 }
1588
1589 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1590
1591 static struct console s3c24xx_serial_console;
1592
1593 static int __init s3c24xx_serial_console_init(void)
1594 {
1595         register_console(&s3c24xx_serial_console);
1596         return 0;
1597 }
1598 console_initcall(s3c24xx_serial_console_init);
1599
1600 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1601 #else
1602 #define S3C24XX_SERIAL_CONSOLE NULL
1603 #endif
1604
1605 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1606 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1607 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1608                          unsigned char c);
1609 #endif
1610
1611 static struct uart_ops s3c24xx_serial_ops = {
1612         .pm             = s3c24xx_serial_pm,
1613         .tx_empty       = s3c24xx_serial_tx_empty,
1614         .get_mctrl      = s3c24xx_serial_get_mctrl,
1615         .set_mctrl      = s3c24xx_serial_set_mctrl,
1616         .stop_tx        = s3c24xx_serial_stop_tx,
1617         .start_tx       = s3c24xx_serial_start_tx,
1618         .stop_rx        = s3c24xx_serial_stop_rx,
1619         .break_ctl      = s3c24xx_serial_break_ctl,
1620         .startup        = s3c24xx_serial_startup,
1621         .shutdown       = s3c24xx_serial_shutdown,
1622         .set_termios    = s3c24xx_serial_set_termios,
1623         .type           = s3c24xx_serial_type,
1624         .release_port   = s3c24xx_serial_release_port,
1625         .request_port   = s3c24xx_serial_request_port,
1626         .config_port    = s3c24xx_serial_config_port,
1627         .verify_port    = s3c24xx_serial_verify_port,
1628 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1629         .poll_get_char = s3c24xx_serial_get_poll_char,
1630         .poll_put_char = s3c24xx_serial_put_poll_char,
1631 #endif
1632 };
1633
1634 static struct uart_driver s3c24xx_uart_drv = {
1635         .owner          = THIS_MODULE,
1636         .driver_name    = "s3c2410_serial",
1637         .nr             = CONFIG_SERIAL_SAMSUNG_UARTS,
1638         .cons           = S3C24XX_SERIAL_CONSOLE,
1639         .dev_name       = S3C24XX_SERIAL_NAME,
1640         .major          = S3C24XX_SERIAL_MAJOR,
1641         .minor          = S3C24XX_SERIAL_MINOR,
1642 };
1643
1644 #define __PORT_LOCK_UNLOCKED(i) \
1645         __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
1646 static struct s3c24xx_uart_port
1647 s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
1648         [0] = {
1649                 .port = {
1650                         .lock           = __PORT_LOCK_UNLOCKED(0),
1651                         .iotype         = UPIO_MEM,
1652                         .uartclk        = 0,
1653                         .fifosize       = 16,
1654                         .ops            = &s3c24xx_serial_ops,
1655                         .flags          = UPF_BOOT_AUTOCONF,
1656                         .line           = 0,
1657                 }
1658         },
1659         [1] = {
1660                 .port = {
1661                         .lock           = __PORT_LOCK_UNLOCKED(1),
1662                         .iotype         = UPIO_MEM,
1663                         .uartclk        = 0,
1664                         .fifosize       = 16,
1665                         .ops            = &s3c24xx_serial_ops,
1666                         .flags          = UPF_BOOT_AUTOCONF,
1667                         .line           = 1,
1668                 }
1669         },
1670 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
1671         [2] = {
1672                 .port = {
1673                         .lock           = __PORT_LOCK_UNLOCKED(2),
1674                         .iotype         = UPIO_MEM,
1675                         .uartclk        = 0,
1676                         .fifosize       = 16,
1677                         .ops            = &s3c24xx_serial_ops,
1678                         .flags          = UPF_BOOT_AUTOCONF,
1679                         .line           = 2,
1680                 }
1681         },
1682 #endif
1683 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
1684         [3] = {
1685                 .port = {
1686                         .lock           = __PORT_LOCK_UNLOCKED(3),
1687                         .iotype         = UPIO_MEM,
1688                         .uartclk        = 0,
1689                         .fifosize       = 16,
1690                         .ops            = &s3c24xx_serial_ops,
1691                         .flags          = UPF_BOOT_AUTOCONF,
1692                         .line           = 3,
1693                 }
1694         }
1695 #endif
1696 };
1697 #undef __PORT_LOCK_UNLOCKED
1698
1699 /* s3c24xx_serial_resetport
1700  *
1701  * reset the fifos and other the settings.
1702  */
1703
1704 static void s3c24xx_serial_resetport(struct uart_port *port,
1705                                    struct s3c2410_uartcfg *cfg)
1706 {
1707         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1708         unsigned long ucon = rd_regl(port, S3C2410_UCON);
1709         unsigned int ucon_mask;
1710
1711         ucon_mask = info->clksel_mask;
1712         if (info->type == PORT_S3C2440)
1713                 ucon_mask |= S3C2440_UCON0_DIVMASK;
1714
1715         ucon &= ucon_mask;
1716         wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
1717
1718         /* reset both fifos */
1719         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1720         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1721
1722         /* some delay is required after fifo reset */
1723         udelay(1);
1724 }
1725
1726 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ
1727
1728 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
1729                                              unsigned long val, void *data)
1730 {
1731         struct s3c24xx_uart_port *port;
1732         struct uart_port *uport;
1733
1734         port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1735         uport = &port->port;
1736
1737         /* check to see if port is enabled */
1738
1739         if (port->pm_level != 0)
1740                 return 0;
1741
1742         /* try and work out if the baudrate is changing, we can detect
1743          * a change in rate, but we do not have support for detecting
1744          * a disturbance in the clock-rate over the change.
1745          */
1746
1747         if (IS_ERR(port->baudclk))
1748                 goto exit;
1749
1750         if (port->baudclk_rate == clk_get_rate(port->baudclk))
1751                 goto exit;
1752
1753         if (val == CPUFREQ_PRECHANGE) {
1754                 /* we should really shut the port down whilst the
1755                  * frequency change is in progress.
1756                  */
1757
1758         } else if (val == CPUFREQ_POSTCHANGE) {
1759                 struct ktermios *termios;
1760                 struct tty_struct *tty;
1761
1762                 if (uport->state == NULL)
1763                         goto exit;
1764
1765                 tty = uport->state->port.tty;
1766
1767                 if (tty == NULL)
1768                         goto exit;
1769
1770                 termios = &tty->termios;
1771
1772                 if (termios == NULL) {
1773                         dev_warn(uport->dev, "%s: no termios?\n", __func__);
1774                         goto exit;
1775                 }
1776
1777                 s3c24xx_serial_set_termios(uport, termios, NULL);
1778         }
1779
1780 exit:
1781         return 0;
1782 }
1783
1784 static inline int
1785 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1786 {
1787         port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1788
1789         return cpufreq_register_notifier(&port->freq_transition,
1790                                          CPUFREQ_TRANSITION_NOTIFIER);
1791 }
1792
1793 static inline void
1794 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1795 {
1796         cpufreq_unregister_notifier(&port->freq_transition,
1797                                     CPUFREQ_TRANSITION_NOTIFIER);
1798 }
1799
1800 #else
1801 static inline int
1802 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1803 {
1804         return 0;
1805 }
1806
1807 static inline void
1808 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1809 {
1810 }
1811 #endif
1812
1813 static int s3c24xx_serial_enable_baudclk(struct s3c24xx_uart_port *ourport)
1814 {
1815         struct device *dev = ourport->port.dev;
1816         struct s3c24xx_uart_info *info = ourport->info;
1817         char clk_name[MAX_CLK_NAME_LENGTH];
1818         unsigned int clk_sel;
1819         struct clk *clk;
1820         int clk_num;
1821         int ret;
1822
1823         clk_sel = ourport->cfg->clk_sel ? : info->def_clk_sel;
1824         for (clk_num = 0; clk_num < info->num_clks; clk_num++) {
1825                 if (!(clk_sel & (1 << clk_num)))
1826                         continue;
1827
1828                 sprintf(clk_name, "clk_uart_baud%d", clk_num);
1829                 clk = clk_get(dev, clk_name);
1830                 if (IS_ERR(clk))
1831                         continue;
1832
1833                 ret = clk_prepare_enable(clk);
1834                 if (ret) {
1835                         clk_put(clk);
1836                         continue;
1837                 }
1838
1839                 ourport->baudclk = clk;
1840                 ourport->baudclk_rate = clk_get_rate(clk);
1841                 s3c24xx_serial_setsource(&ourport->port, clk_num);
1842
1843                 return 0;
1844         }
1845
1846         return -EINVAL;
1847 }
1848
1849 /* s3c24xx_serial_init_port
1850  *
1851  * initialise a single serial port from the platform device given
1852  */
1853
1854 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1855                                     struct platform_device *platdev)
1856 {
1857         struct uart_port *port = &ourport->port;
1858         struct s3c2410_uartcfg *cfg = ourport->cfg;
1859         struct resource *res;
1860         int ret;
1861
1862         if (platdev == NULL)
1863                 return -ENODEV;
1864
1865         if (port->mapbase != 0)
1866                 return -EINVAL;
1867
1868         /* setup info for port */
1869         port->dev       = &platdev->dev;
1870
1871         /* Startup sequence is different for s3c64xx and higher SoC's */
1872         if (s3c24xx_serial_has_interrupt_mask(port))
1873                 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1874
1875         port->uartclk = 1;
1876
1877         if (cfg->uart_flags & UPF_CONS_FLOW) {
1878                 dev_dbg(port->dev, "enabling flow control\n");
1879                 port->flags |= UPF_CONS_FLOW;
1880         }
1881
1882         /* sort our the physical and virtual addresses for each UART */
1883
1884         res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1885         if (res == NULL) {
1886                 dev_err(port->dev, "failed to find memory resource for uart\n");
1887                 return -EINVAL;
1888         }
1889
1890         dev_dbg(port->dev, "resource %pR)\n", res);
1891
1892         port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
1893         if (!port->membase) {
1894                 dev_err(port->dev, "failed to remap controller address\n");
1895                 return -EBUSY;
1896         }
1897
1898         port->mapbase = res->start;
1899         ret = platform_get_irq(platdev, 0);
1900         if (ret < 0) {
1901                 port->irq = 0;
1902         } else {
1903                 port->irq = ret;
1904                 ourport->rx_irq = ret;
1905                 ourport->tx_irq = ret + 1;
1906         }
1907
1908         if (!s3c24xx_serial_has_interrupt_mask(port)) {
1909                 ret = platform_get_irq(platdev, 1);
1910                 if (ret > 0)
1911                         ourport->tx_irq = ret;
1912         }
1913         /*
1914          * DMA is currently supported only on DT platforms, if DMA properties
1915          * are specified.
1916          */
1917         if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1918                                                      "dmas", NULL)) {
1919                 ourport->dma = devm_kzalloc(port->dev,
1920                                             sizeof(*ourport->dma),
1921                                             GFP_KERNEL);
1922                 if (!ourport->dma) {
1923                         ret = -ENOMEM;
1924                         goto err;
1925                 }
1926         }
1927
1928         ourport->clk    = clk_get(&platdev->dev, "uart");
1929         if (IS_ERR(ourport->clk)) {
1930                 pr_err("%s: Controller clock not found\n",
1931                                 dev_name(&platdev->dev));
1932                 ret = PTR_ERR(ourport->clk);
1933                 goto err;
1934         }
1935
1936         ret = clk_prepare_enable(ourport->clk);
1937         if (ret) {
1938                 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1939                 clk_put(ourport->clk);
1940                 goto err;
1941         }
1942
1943         ret = s3c24xx_serial_enable_baudclk(ourport);
1944         if (ret)
1945                 pr_warn("uart: failed to enable baudclk\n");
1946
1947         /* Keep all interrupts masked and cleared */
1948         if (s3c24xx_serial_has_interrupt_mask(port)) {
1949                 wr_regl(port, S3C64XX_UINTM, 0xf);
1950                 wr_regl(port, S3C64XX_UINTP, 0xf);
1951                 wr_regl(port, S3C64XX_UINTSP, 0xf);
1952         }
1953
1954         dev_dbg(port->dev, "port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1955                 &port->mapbase, port->membase, port->irq,
1956                 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1957
1958         /* reset the fifos (and setup the uart) */
1959         s3c24xx_serial_resetport(port, cfg);
1960
1961         return 0;
1962
1963 err:
1964         port->mapbase = 0;
1965         return ret;
1966 }
1967
1968 /* Device driver serial port probe */
1969
1970 #ifdef CONFIG_OF
1971 static const struct of_device_id s3c24xx_uart_dt_match[];
1972 #endif
1973
1974 static int probe_index;
1975
1976 static inline struct s3c24xx_serial_drv_data *
1977 s3c24xx_get_driver_data(struct platform_device *pdev)
1978 {
1979 #ifdef CONFIG_OF
1980         if (pdev->dev.of_node) {
1981                 const struct of_device_id *match;
1982
1983                 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1984                 return (struct s3c24xx_serial_drv_data *)match->data;
1985         }
1986 #endif
1987         return (struct s3c24xx_serial_drv_data *)
1988                         platform_get_device_id(pdev)->driver_data;
1989 }
1990
1991 static int s3c24xx_serial_probe(struct platform_device *pdev)
1992 {
1993         struct device_node *np = pdev->dev.of_node;
1994         struct s3c24xx_uart_port *ourport;
1995         int index = probe_index;
1996         int ret, prop = 0;
1997
1998         if (np) {
1999                 ret = of_alias_get_id(np, "serial");
2000                 if (ret >= 0)
2001                         index = ret;
2002         }
2003
2004         if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) {
2005                 dev_err(&pdev->dev, "serial%d out of range\n", index);
2006                 return -EINVAL;
2007         }
2008         ourport = &s3c24xx_serial_ports[index];
2009
2010         ourport->drv_data = s3c24xx_get_driver_data(pdev);
2011         if (!ourport->drv_data) {
2012                 dev_err(&pdev->dev, "could not find driver data\n");
2013                 return -ENODEV;
2014         }
2015
2016         ourport->baudclk = ERR_PTR(-EINVAL);
2017         ourport->info = ourport->drv_data->info;
2018         ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
2019                         dev_get_platdata(&pdev->dev) :
2020                         ourport->drv_data->def_cfg;
2021
2022         if (np) {
2023                 of_property_read_u32(np,
2024                         "samsung,uart-fifosize", &ourport->port.fifosize);
2025
2026                 if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
2027                         switch (prop) {
2028                         case 1:
2029                                 ourport->port.iotype = UPIO_MEM;
2030                                 break;
2031                         case 4:
2032                                 ourport->port.iotype = UPIO_MEM32;
2033                                 break;
2034                         default:
2035                                 dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n",
2036                                                 prop);
2037                                 ret = -EINVAL;
2038                                 break;
2039                         }
2040                 }
2041         }
2042
2043         if (ourport->drv_data->fifosize[index])
2044                 ourport->port.fifosize = ourport->drv_data->fifosize[index];
2045         else if (ourport->info->fifosize)
2046                 ourport->port.fifosize = ourport->info->fifosize;
2047         ourport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SAMSUNG_CONSOLE);
2048
2049         /*
2050          * DMA transfers must be aligned at least to cache line size,
2051          * so find minimal transfer size suitable for DMA mode
2052          */
2053         ourport->min_dma_size = max_t(int, ourport->port.fifosize,
2054                                     dma_get_cache_alignment());
2055
2056         dev_dbg(&pdev->dev, "%s: initialising port %p...\n", __func__, ourport);
2057
2058         ret = s3c24xx_serial_init_port(ourport, pdev);
2059         if (ret < 0)
2060                 return ret;
2061
2062         if (!s3c24xx_uart_drv.state) {
2063                 ret = uart_register_driver(&s3c24xx_uart_drv);
2064                 if (ret < 0) {
2065                         pr_err("Failed to register Samsung UART driver\n");
2066                         return ret;
2067                 }
2068         }
2069
2070         dev_dbg(&pdev->dev, "%s: adding port\n", __func__);
2071         uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
2072         platform_set_drvdata(pdev, &ourport->port);
2073
2074         /*
2075          * Deactivate the clock enabled in s3c24xx_serial_init_port here,
2076          * so that a potential re-enablement through the pm-callback overlaps
2077          * and keeps the clock enabled in this case.
2078          */
2079         clk_disable_unprepare(ourport->clk);
2080         if (!IS_ERR(ourport->baudclk))
2081                 clk_disable_unprepare(ourport->baudclk);
2082
2083         ret = s3c24xx_serial_cpufreq_register(ourport);
2084         if (ret < 0)
2085                 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
2086
2087         probe_index++;
2088
2089         return 0;
2090 }
2091
2092 static int s3c24xx_serial_remove(struct platform_device *dev)
2093 {
2094         struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
2095
2096         if (port) {
2097                 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
2098                 uart_remove_one_port(&s3c24xx_uart_drv, port);
2099         }
2100
2101         uart_unregister_driver(&s3c24xx_uart_drv);
2102
2103         return 0;
2104 }
2105
2106 /* UART power management code */
2107 #ifdef CONFIG_PM_SLEEP
2108 static int s3c24xx_serial_suspend(struct device *dev)
2109 {
2110         struct uart_port *port = s3c24xx_dev_to_port(dev);
2111
2112         if (port)
2113                 uart_suspend_port(&s3c24xx_uart_drv, port);
2114
2115         return 0;
2116 }
2117
2118 static int s3c24xx_serial_resume(struct device *dev)
2119 {
2120         struct uart_port *port = s3c24xx_dev_to_port(dev);
2121         struct s3c24xx_uart_port *ourport = to_ourport(port);
2122
2123         if (port) {
2124                 clk_prepare_enable(ourport->clk);
2125                 if (!IS_ERR(ourport->baudclk))
2126                         clk_prepare_enable(ourport->baudclk);
2127                 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
2128                 if (!IS_ERR(ourport->baudclk))
2129                         clk_disable_unprepare(ourport->baudclk);
2130                 clk_disable_unprepare(ourport->clk);
2131
2132                 uart_resume_port(&s3c24xx_uart_drv, port);
2133         }
2134
2135         return 0;
2136 }
2137
2138 static int s3c24xx_serial_resume_noirq(struct device *dev)
2139 {
2140         struct uart_port *port = s3c24xx_dev_to_port(dev);
2141         struct s3c24xx_uart_port *ourport = to_ourport(port);
2142
2143         if (port) {
2144                 /* restore IRQ mask */
2145                 if (s3c24xx_serial_has_interrupt_mask(port)) {
2146                         unsigned int uintm = 0xf;
2147
2148                         if (ourport->tx_enabled)
2149                                 uintm &= ~S3C64XX_UINTM_TXD_MSK;
2150                         if (ourport->rx_enabled)
2151                                 uintm &= ~S3C64XX_UINTM_RXD_MSK;
2152                         clk_prepare_enable(ourport->clk);
2153                         if (!IS_ERR(ourport->baudclk))
2154                                 clk_prepare_enable(ourport->baudclk);
2155                         wr_regl(port, S3C64XX_UINTM, uintm);
2156                         if (!IS_ERR(ourport->baudclk))
2157                                 clk_disable_unprepare(ourport->baudclk);
2158                         clk_disable_unprepare(ourport->clk);
2159                 }
2160         }
2161
2162         return 0;
2163 }
2164
2165 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
2166         .suspend = s3c24xx_serial_suspend,
2167         .resume = s3c24xx_serial_resume,
2168         .resume_noirq = s3c24xx_serial_resume_noirq,
2169 };
2170 #define SERIAL_SAMSUNG_PM_OPS   (&s3c24xx_serial_pm_ops)
2171
2172 #else /* !CONFIG_PM_SLEEP */
2173
2174 #define SERIAL_SAMSUNG_PM_OPS   NULL
2175 #endif /* CONFIG_PM_SLEEP */
2176
2177 /* Console code */
2178
2179 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2180
2181 static struct uart_port *cons_uart;
2182
2183 static int
2184 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
2185 {
2186         struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
2187         unsigned long ufstat, utrstat;
2188
2189         if (ufcon & S3C2410_UFCON_FIFOMODE) {
2190                 /* fifo mode - check amount of data in fifo registers... */
2191
2192                 ufstat = rd_regl(port, S3C2410_UFSTAT);
2193                 return (ufstat & info->tx_fifofull) ? 0 : 1;
2194         }
2195
2196         /* in non-fifo mode, we go and use the tx buffer empty */
2197
2198         utrstat = rd_regl(port, S3C2410_UTRSTAT);
2199         return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
2200 }
2201
2202 static bool
2203 s3c24xx_port_configured(unsigned int ucon)
2204 {
2205         /* consider the serial port configured if the tx/rx mode set */
2206         return (ucon & 0xf) != 0;
2207 }
2208
2209 #ifdef CONFIG_CONSOLE_POLL
2210 /*
2211  * Console polling routines for writing and reading from the uart while
2212  * in an interrupt or debug context.
2213  */
2214
2215 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
2216 {
2217         struct s3c24xx_uart_port *ourport = to_ourport(port);
2218         unsigned int ufstat;
2219
2220         ufstat = rd_regl(port, S3C2410_UFSTAT);
2221         if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
2222                 return NO_POLL_CHAR;
2223
2224         return rd_reg(port, S3C2410_URXH);
2225 }
2226
2227 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
2228                 unsigned char c)
2229 {
2230         unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2231         unsigned int ucon = rd_regl(port, S3C2410_UCON);
2232
2233         /* not possible to xmit on unconfigured port */
2234         if (!s3c24xx_port_configured(ucon))
2235                 return;
2236
2237         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2238                 cpu_relax();
2239         wr_reg(port, S3C2410_UTXH, c);
2240 }
2241
2242 #endif /* CONFIG_CONSOLE_POLL */
2243
2244 static void
2245 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
2246 {
2247         unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2248
2249         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2250                 cpu_relax();
2251         wr_reg(port, S3C2410_UTXH, ch);
2252 }
2253
2254 static void
2255 s3c24xx_serial_console_write(struct console *co, const char *s,
2256                              unsigned int count)
2257 {
2258         unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
2259
2260         /* not possible to xmit on unconfigured port */
2261         if (!s3c24xx_port_configured(ucon))
2262                 return;
2263
2264         uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2265 }
2266
2267 static void __init
2268 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2269                            int *parity, int *bits)
2270 {
2271         struct clk *clk;
2272         unsigned int ulcon;
2273         unsigned int ucon;
2274         unsigned int ubrdiv;
2275         unsigned long rate;
2276         unsigned int clk_sel;
2277         char clk_name[MAX_CLK_NAME_LENGTH];
2278
2279         ulcon  = rd_regl(port, S3C2410_ULCON);
2280         ucon   = rd_regl(port, S3C2410_UCON);
2281         ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2282
2283         if (s3c24xx_port_configured(ucon)) {
2284                 switch (ulcon & S3C2410_LCON_CSMASK) {
2285                 case S3C2410_LCON_CS5:
2286                         *bits = 5;
2287                         break;
2288                 case S3C2410_LCON_CS6:
2289                         *bits = 6;
2290                         break;
2291                 case S3C2410_LCON_CS7:
2292                         *bits = 7;
2293                         break;
2294                 case S3C2410_LCON_CS8:
2295                 default:
2296                         *bits = 8;
2297                         break;
2298                 }
2299
2300                 switch (ulcon & S3C2410_LCON_PMASK) {
2301                 case S3C2410_LCON_PEVEN:
2302                         *parity = 'e';
2303                         break;
2304
2305                 case S3C2410_LCON_PODD:
2306                         *parity = 'o';
2307                         break;
2308
2309                 case S3C2410_LCON_PNONE:
2310                 default:
2311                         *parity = 'n';
2312                 }
2313
2314                 /* now calculate the baud rate */
2315
2316                 clk_sel = s3c24xx_serial_getsource(port);
2317                 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2318
2319                 clk = clk_get(port->dev, clk_name);
2320                 if (!IS_ERR(clk))
2321                         rate = clk_get_rate(clk);
2322                 else
2323                         rate = 1;
2324
2325                 *baud = rate / (16 * (ubrdiv + 1));
2326                 dev_dbg(port->dev, "calculated baud %d\n", *baud);
2327         }
2328 }
2329
2330 static int __init
2331 s3c24xx_serial_console_setup(struct console *co, char *options)
2332 {
2333         struct uart_port *port;
2334         int baud = 9600;
2335         int bits = 8;
2336         int parity = 'n';
2337         int flow = 'n';
2338
2339         /* is this a valid port */
2340
2341         if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
2342                 co->index = 0;
2343
2344         port = &s3c24xx_serial_ports[co->index].port;
2345
2346         /* is the port configured? */
2347
2348         if (port->mapbase == 0x0)
2349                 return -ENODEV;
2350
2351         cons_uart = port;
2352
2353         /*
2354          * Check whether an invalid uart number has been specified, and
2355          * if so, search for the first available port that does have
2356          * console support.
2357          */
2358         if (options)
2359                 uart_parse_options(options, &baud, &parity, &bits, &flow);
2360         else
2361                 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2362
2363         dev_dbg(port->dev, "baud %d\n", baud);
2364
2365         return uart_set_options(port, co, baud, parity, bits, flow);
2366 }
2367
2368 static struct console s3c24xx_serial_console = {
2369         .name           = S3C24XX_SERIAL_NAME,
2370         .device         = uart_console_device,
2371         .flags          = CON_PRINTBUFFER,
2372         .index          = -1,
2373         .write          = s3c24xx_serial_console_write,
2374         .setup          = s3c24xx_serial_console_setup,
2375         .data           = &s3c24xx_uart_drv,
2376 };
2377 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2378
2379 #ifdef CONFIG_CPU_S3C2410
2380 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
2381         .info = &(struct s3c24xx_uart_info) {
2382                 .name           = "Samsung S3C2410 UART",
2383                 .type           = PORT_S3C2410,
2384                 .fifosize       = 16,
2385                 .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
2386                 .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
2387                 .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
2388                 .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
2389                 .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
2390                 .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
2391                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2392                 .num_clks       = 2,
2393                 .clksel_mask    = S3C2410_UCON_CLKMASK,
2394                 .clksel_shift   = S3C2410_UCON_CLKSHIFT,
2395         },
2396         .def_cfg = &(struct s3c2410_uartcfg) {
2397                 .ucon           = S3C2410_UCON_DEFAULT,
2398                 .ufcon          = S3C2410_UFCON_DEFAULT,
2399         },
2400 };
2401 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
2402 #else
2403 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2404 #endif
2405
2406 #ifdef CONFIG_CPU_S3C2412
2407 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
2408         .info = &(struct s3c24xx_uart_info) {
2409                 .name           = "Samsung S3C2412 UART",
2410                 .type           = PORT_S3C2412,
2411                 .fifosize       = 64,
2412                 .has_divslot    = 1,
2413                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2414                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2415                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2416                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2417                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2418                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2419                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2420                 .num_clks       = 4,
2421                 .clksel_mask    = S3C2412_UCON_CLKMASK,
2422                 .clksel_shift   = S3C2412_UCON_CLKSHIFT,
2423         },
2424         .def_cfg = &(struct s3c2410_uartcfg) {
2425                 .ucon           = S3C2410_UCON_DEFAULT,
2426                 .ufcon          = S3C2410_UFCON_DEFAULT,
2427         },
2428 };
2429 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
2430 #else
2431 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2432 #endif
2433
2434 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
2435         defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
2436 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
2437         .info = &(struct s3c24xx_uart_info) {
2438                 .name           = "Samsung S3C2440 UART",
2439                 .type           = PORT_S3C2440,
2440                 .fifosize       = 64,
2441                 .has_divslot    = 1,
2442                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2443                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2444                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2445                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2446                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2447                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2448                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2449                 .num_clks       = 4,
2450                 .clksel_mask    = S3C2412_UCON_CLKMASK,
2451                 .clksel_shift   = S3C2412_UCON_CLKSHIFT,
2452         },
2453         .def_cfg = &(struct s3c2410_uartcfg) {
2454                 .ucon           = S3C2410_UCON_DEFAULT,
2455                 .ufcon          = S3C2410_UFCON_DEFAULT,
2456         },
2457 };
2458 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
2459 #else
2460 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2461 #endif
2462
2463 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2464 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2465         .info = &(struct s3c24xx_uart_info) {
2466                 .name           = "Samsung S3C6400 UART",
2467                 .type           = PORT_S3C6400,
2468                 .fifosize       = 64,
2469                 .has_divslot    = 1,
2470                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2471                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2472                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2473                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2474                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2475                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2476                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2477                 .num_clks       = 4,
2478                 .clksel_mask    = S3C6400_UCON_CLKMASK,
2479                 .clksel_shift   = S3C6400_UCON_CLKSHIFT,
2480         },
2481         .def_cfg = &(struct s3c2410_uartcfg) {
2482                 .ucon           = S3C2410_UCON_DEFAULT,
2483                 .ufcon          = S3C2410_UFCON_DEFAULT,
2484         },
2485 };
2486 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
2487 #else
2488 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2489 #endif
2490
2491 #ifdef CONFIG_CPU_S5PV210
2492 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2493         .info = &(struct s3c24xx_uart_info) {
2494                 .name           = "Samsung S5PV210 UART",
2495                 .type           = PORT_S3C6400,
2496                 .has_divslot    = 1,
2497                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,
2498                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,
2499                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,
2500                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,
2501                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,
2502                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,
2503                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2504                 .num_clks       = 2,
2505                 .clksel_mask    = S5PV210_UCON_CLKMASK,
2506                 .clksel_shift   = S5PV210_UCON_CLKSHIFT,
2507         },
2508         .def_cfg = &(struct s3c2410_uartcfg) {
2509                 .ucon           = S5PV210_UCON_DEFAULT,
2510                 .ufcon          = S5PV210_UFCON_DEFAULT,
2511         },
2512         .fifosize = { 256, 64, 16, 16 },
2513 };
2514 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
2515 #else
2516 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2517 #endif
2518
2519 #if defined(CONFIG_ARCH_EXYNOS)
2520 #define EXYNOS_COMMON_SERIAL_DRV_DATA                           \
2521         .info = &(struct s3c24xx_uart_info) {                   \
2522                 .name           = "Samsung Exynos UART",        \
2523                 .type           = PORT_S3C6400,                 \
2524                 .has_divslot    = 1,                            \
2525                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
2526                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
2527                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
2528                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
2529                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
2530                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
2531                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,         \
2532                 .num_clks       = 1,                            \
2533                 .clksel_mask    = 0,                            \
2534                 .clksel_shift   = 0,                            \
2535         },                                                      \
2536         .def_cfg = &(struct s3c2410_uartcfg) {                  \
2537                 .ucon           = S5PV210_UCON_DEFAULT,         \
2538                 .ufcon          = S5PV210_UFCON_DEFAULT,        \
2539                 .has_fracval    = 1,                            \
2540         }                                                       \
2541
2542 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2543         EXYNOS_COMMON_SERIAL_DRV_DATA,
2544         .fifosize = { 256, 64, 16, 16 },
2545 };
2546
2547 static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2548         EXYNOS_COMMON_SERIAL_DRV_DATA,
2549         .fifosize = { 64, 256, 16, 256 },
2550 };
2551
2552 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
2553 #define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
2554 #else
2555 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2556 #define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2557 #endif
2558
2559 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
2560         {
2561                 .name           = "s3c2410-uart",
2562                 .driver_data    = S3C2410_SERIAL_DRV_DATA,
2563         }, {
2564                 .name           = "s3c2412-uart",
2565                 .driver_data    = S3C2412_SERIAL_DRV_DATA,
2566         }, {
2567                 .name           = "s3c2440-uart",
2568                 .driver_data    = S3C2440_SERIAL_DRV_DATA,
2569         }, {
2570                 .name           = "s3c6400-uart",
2571                 .driver_data    = S3C6400_SERIAL_DRV_DATA,
2572         }, {
2573                 .name           = "s5pv210-uart",
2574                 .driver_data    = S5PV210_SERIAL_DRV_DATA,
2575         }, {
2576                 .name           = "exynos4210-uart",
2577                 .driver_data    = EXYNOS4210_SERIAL_DRV_DATA,
2578         }, {
2579                 .name           = "exynos5433-uart",
2580                 .driver_data    = EXYNOS5433_SERIAL_DRV_DATA,
2581         },
2582         { },
2583 };
2584 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2585
2586 #ifdef CONFIG_OF
2587 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2588         { .compatible = "samsung,s3c2410-uart",
2589                 .data = (void *)S3C2410_SERIAL_DRV_DATA },
2590         { .compatible = "samsung,s3c2412-uart",
2591                 .data = (void *)S3C2412_SERIAL_DRV_DATA },
2592         { .compatible = "samsung,s3c2440-uart",
2593                 .data = (void *)S3C2440_SERIAL_DRV_DATA },
2594         { .compatible = "samsung,s3c6400-uart",
2595                 .data = (void *)S3C6400_SERIAL_DRV_DATA },
2596         { .compatible = "samsung,s5pv210-uart",
2597                 .data = (void *)S5PV210_SERIAL_DRV_DATA },
2598         { .compatible = "samsung,exynos4210-uart",
2599                 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
2600         { .compatible = "samsung,exynos5433-uart",
2601                 .data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
2602         {},
2603 };
2604 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2605 #endif
2606
2607 static struct platform_driver samsung_serial_driver = {
2608         .probe          = s3c24xx_serial_probe,
2609         .remove         = s3c24xx_serial_remove,
2610         .id_table       = s3c24xx_serial_driver_ids,
2611         .driver         = {
2612                 .name   = "samsung-uart",
2613                 .pm     = SERIAL_SAMSUNG_PM_OPS,
2614                 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2615         },
2616 };
2617
2618 module_platform_driver(samsung_serial_driver);
2619
2620 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2621 /*
2622  * Early console.
2623  */
2624
2625 static void wr_reg_barrier(struct uart_port *port, u32 reg, u32 val)
2626 {
2627         switch (port->iotype) {
2628         case UPIO_MEM:
2629                 writeb(val, portaddr(port, reg));
2630                 break;
2631         case UPIO_MEM32:
2632                 writel(val, portaddr(port, reg));
2633                 break;
2634         }
2635 }
2636
2637 struct samsung_early_console_data {
2638         u32 txfull_mask;
2639 };
2640
2641 static void samsung_early_busyuart(struct uart_port *port)
2642 {
2643         while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2644                 ;
2645 }
2646
2647 static void samsung_early_busyuart_fifo(struct uart_port *port)
2648 {
2649         struct samsung_early_console_data *data = port->private_data;
2650
2651         while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2652                 ;
2653 }
2654
2655 static void samsung_early_putc(struct uart_port *port, int c)
2656 {
2657         if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2658                 samsung_early_busyuart_fifo(port);
2659         else
2660                 samsung_early_busyuart(port);
2661
2662         wr_reg_barrier(port, S3C2410_UTXH, c);
2663 }
2664
2665 static void samsung_early_write(struct console *con, const char *s,
2666                                 unsigned int n)
2667 {
2668         struct earlycon_device *dev = con->data;
2669
2670         uart_console_write(&dev->port, s, n, samsung_early_putc);
2671 }
2672
2673 static int __init samsung_early_console_setup(struct earlycon_device *device,
2674                                               const char *opt)
2675 {
2676         if (!device->port.membase)
2677                 return -ENODEV;
2678
2679         device->con->write = samsung_early_write;
2680         return 0;
2681 }
2682
2683 /* S3C2410 */
2684 static struct samsung_early_console_data s3c2410_early_console_data = {
2685         .txfull_mask = S3C2410_UFSTAT_TXFULL,
2686 };
2687
2688 static int __init s3c2410_early_console_setup(struct earlycon_device *device,
2689                                               const char *opt)
2690 {
2691         device->port.private_data = &s3c2410_early_console_data;
2692         return samsung_early_console_setup(device, opt);
2693 }
2694
2695 OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
2696                         s3c2410_early_console_setup);
2697
2698 /* S3C2412, S3C2440, S3C64xx */
2699 static struct samsung_early_console_data s3c2440_early_console_data = {
2700         .txfull_mask = S3C2440_UFSTAT_TXFULL,
2701 };
2702
2703 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2704                                               const char *opt)
2705 {
2706         device->port.private_data = &s3c2440_early_console_data;
2707         return samsung_early_console_setup(device, opt);
2708 }
2709
2710 OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
2711                         s3c2440_early_console_setup);
2712 OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
2713                         s3c2440_early_console_setup);
2714 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2715                         s3c2440_early_console_setup);
2716
2717 /* S5PV210, Exynos */
2718 static struct samsung_early_console_data s5pv210_early_console_data = {
2719         .txfull_mask = S5PV210_UFSTAT_TXFULL,
2720 };
2721
2722 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2723                                               const char *opt)
2724 {
2725         device->port.private_data = &s5pv210_early_console_data;
2726         return samsung_early_console_setup(device, opt);
2727 }
2728
2729 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2730                         s5pv210_early_console_setup);
2731 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2732                         s5pv210_early_console_setup);
2733 #endif
2734
2735 MODULE_ALIAS("platform:samsung-uart");
2736 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2737 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
2738 MODULE_LICENSE("GPL v2");