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/console.h>
  25 #include <linux/clk.h>
  26 #include <linux/cpufreq.h>
  27 #include <linux/delay.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/dmaengine.h>
  30 #include <linux/init.h>
  31 #include <linux/io.h>
  32 #include <linux/ioport.h>
  33 #include <linux/math.h>
  34 #include <linux/module.h>
  35 #include <linux/of.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/serial.h>
  38 #include <linux/serial_core.h>
  39 #include <linux/serial_s3c.h>
  40 #include <linux/slab.h>
  41 #include <linux/sysrq.h>
  42 #include <linux/tty.h>
  43 #include <linux/tty_flip.h>
  44 #include <linux/types.h>
  45
  46 #include <asm/irq.h>
  47
  48 /* UART name and device definitions */
  49
  50 #define S3C24XX_SERIAL_NAME     "ttySAC"
  51 #define S3C24XX_SERIAL_MAJOR    204
  52 #define S3C24XX_SERIAL_MINOR    64
  53
  54 #ifdef CONFIG_ARM64
  55 #define UART_NR                 12
  56 #else
  57 #define UART_NR                 CONFIG_SERIAL_SAMSUNG_UARTS
  58 #endif
  59
  60 #define S3C24XX_TX_PIO                  1
  61 #define S3C24XX_TX_DMA                  2
  62 #define S3C24XX_RX_PIO                  1
  63 #define S3C24XX_RX_DMA                  2
  64
  65 /* flag to ignore all characters coming in */
  66 #define RXSTAT_DUMMY_READ (0x10000000)
  67
  68 enum s3c24xx_port_type {
  69         TYPE_S3C6400,
  70         TYPE_APPLE_S5L,
  71 };
  72
  73 struct s3c24xx_uart_info {
  74         const char              *name;
  75         enum s3c24xx_port_type  type;
  76         unsigned int            port_type;
  77         unsigned int            fifosize;
  78         u32                     rx_fifomask;
  79         u32                     rx_fifoshift;
  80         u32                     rx_fifofull;
  81         u32                     tx_fifomask;
  82         u32                     tx_fifoshift;
  83         u32                     tx_fifofull;
  84         u32                     clksel_mask;
  85         u32                     clksel_shift;
  86         u32                     ucon_mask;
  87         u8                      def_clk_sel;
  88         u8                      num_clks;
  89         u8                      iotype;
  90
  91         /* uart port features */
  92         bool                    has_divslot;
  93 };
  94
  95 struct s3c24xx_serial_drv_data {
  96         const struct s3c24xx_uart_info  info;
  97         const struct s3c2410_uartcfg    def_cfg;
  98         const unsigned int              fifosize[UART_NR];
  99 };
 100
 101 struct s3c24xx_uart_dma {
 102         unsigned int                    rx_chan_id;
 103         unsigned int                    tx_chan_id;
 104
 105         struct dma_slave_config         rx_conf;
 106         struct dma_slave_config         tx_conf;
 107
 108         struct dma_chan                 *rx_chan;
 109         struct dma_chan                 *tx_chan;
 110
 111         dma_addr_t                      rx_addr;
 112         dma_addr_t                      tx_addr;
 113
 114         dma_cookie_t                    rx_cookie;
 115         dma_cookie_t                    tx_cookie;
 116
 117         char                            *rx_buf;
 118
 119         dma_addr_t                      tx_transfer_addr;
 120
 121         size_t                          rx_size;
 122         size_t                          tx_size;
 123
 124         struct dma_async_tx_descriptor  *tx_desc;
 125         struct dma_async_tx_descriptor  *rx_desc;
 126
 127         int                             tx_bytes_requested;
 128         int                             rx_bytes_requested;
 129 };
 130
 131 struct s3c24xx_uart_port {
 132         unsigned char                   rx_enabled;
 133         unsigned char                   tx_enabled;
 134         unsigned int                    pm_level;
 135         unsigned long                   baudclk_rate;
 136         unsigned int                    min_dma_size;
 137
 138         unsigned int                    rx_irq;
 139         unsigned int                    tx_irq;
 140
 141         unsigned int                    tx_in_progress;
 142         unsigned int                    tx_mode;
 143         unsigned int                    rx_mode;
 144
 145         const struct s3c24xx_uart_info  *info;
 146         struct clk                      *clk;
 147         struct clk                      *baudclk;
 148         struct uart_port                port;
 149         const struct s3c24xx_serial_drv_data    *drv_data;
 150
 151         /* reference to platform data */
 152         const struct s3c2410_uartcfg    *cfg;
 153
 154         struct s3c24xx_uart_dma         *dma;
 155 };
 156
 157 static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport);
 158
 159 /* conversion functions */
 160
 161 #define s3c24xx_dev_to_port(__dev) dev_get_drvdata(__dev)
 162
 163 /* register access controls */
 164
 165 #define portaddr(port, reg) ((port)->membase + (reg))
 166 #define portaddrl(port, reg) \
 167         ((unsigned long *)(unsigned long)((port)->membase + (reg)))
 168
 169 static u32 rd_reg(const struct uart_port *port, u32 reg)
 170 {
 171         switch (port->iotype) {
 172         case UPIO_MEM:
 173                 return readb_relaxed(portaddr(port, reg));
 174         case UPIO_MEM32:
 175                 return readl_relaxed(portaddr(port, reg));
 176         default:
 177                 return 0;
 178         }
 179         return 0;
 180 }
 181
 182 #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
 183
 184 static void wr_reg(const struct uart_port *port, u32 reg, u32 val)
 185 {
 186         switch (port->iotype) {
 187         case UPIO_MEM:
 188                 writeb_relaxed(val, portaddr(port, reg));
 189                 break;
 190         case UPIO_MEM32:
 191                 writel_relaxed(val, portaddr(port, reg));
 192                 break;
 193         }
 194 }
 195
 196 #define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port, reg))
 197
 198 /* Byte-order aware bit setting/clearing functions. */
 199
 200 static inline void s3c24xx_set_bit(const struct uart_port *port, int idx,
 201                                    u32 reg)
 202 {
 203         unsigned long flags;
 204         u32 val;
 205
 206         local_irq_save(flags);
 207         val = rd_regl(port, reg);
 208         val |= (1 << idx);
 209         wr_regl(port, reg, val);
 210         local_irq_restore(flags);
 211 }
 212
 213 static inline void s3c24xx_clear_bit(const struct uart_port *port, int idx,
 214                                      u32 reg)
 215 {
 216         unsigned long flags;
 217         u32 val;
 218
 219         local_irq_save(flags);
 220         val = rd_regl(port, reg);
 221         val &= ~(1 << idx);
 222         wr_regl(port, reg, val);
 223         local_irq_restore(flags);
 224 }
 225
 226 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
 227 {
 228         return container_of(port, struct s3c24xx_uart_port, port);
 229 }
 230
 231 /* translate a port to the device name */
 232
 233 static inline const char *s3c24xx_serial_portname(const struct uart_port *port)
 234 {
 235         return to_platform_device(port->dev)->name;
 236 }
 237
 238 static bool s3c24xx_serial_txempty_nofifo(const struct uart_port *port)
 239 {
 240         return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
 241 }
 242
 243 static void s3c24xx_serial_rx_enable(struct uart_port *port)
 244 {
 245         struct s3c24xx_uart_port *ourport = to_ourport(port);
 246         unsigned long flags;
 247         int count = 10000;
 248         u32 ucon, ufcon;
 249
 250         uart_port_lock_irqsave(port, &flags);
 251
 252         while (--count && !s3c24xx_serial_txempty_nofifo(port))
 253                 udelay(100);
 254
 255         ufcon = rd_regl(port, S3C2410_UFCON);
 256         ufcon |= S3C2410_UFCON_RESETRX;
 257         wr_regl(port, S3C2410_UFCON, ufcon);
 258
 259         ucon = rd_regl(port, S3C2410_UCON);
 260         ucon |= S3C2410_UCON_RXIRQMODE;
 261         wr_regl(port, S3C2410_UCON, ucon);
 262
 263         ourport->rx_enabled = 1;
 264         uart_port_unlock_irqrestore(port, flags);
 265 }
 266
 267 static void s3c24xx_serial_rx_disable(struct uart_port *port)
 268 {
 269         struct s3c24xx_uart_port *ourport = to_ourport(port);
 270         unsigned long flags;
 271         u32 ucon;
 272
 273         uart_port_lock_irqsave(port, &flags);
 274
 275         ucon = rd_regl(port, S3C2410_UCON);
 276         ucon &= ~S3C2410_UCON_RXIRQMODE;
 277         wr_regl(port, S3C2410_UCON, ucon);
 278
 279         ourport->rx_enabled = 0;
 280         uart_port_unlock_irqrestore(port, flags);
 281 }
 282
 283 static void s3c24xx_serial_stop_tx(struct uart_port *port)
 284 {
 285         struct s3c24xx_uart_port *ourport = to_ourport(port);
 286         struct s3c24xx_uart_dma *dma = ourport->dma;
 287         struct dma_tx_state state;
 288         int count;
 289
 290         if (!ourport->tx_enabled)
 291                 return;
 292
 293         switch (ourport->info->type) {
 294         case TYPE_S3C6400:
 295                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 296                 break;
 297         case TYPE_APPLE_S5L:
 298                 s3c24xx_clear_bit(port, APPLE_S5L_UCON_TXTHRESH_ENA, S3C2410_UCON);
 299                 break;
 300         default:
 301                 disable_irq_nosync(ourport->tx_irq);
 302                 break;
 303         }
 304
 305         if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
 306                 dmaengine_pause(dma->tx_chan);
 307                 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 308                 dmaengine_terminate_all(dma->tx_chan);
 309                 dma_sync_single_for_cpu(dma->tx_chan->device->dev,
 310                                         dma->tx_transfer_addr, dma->tx_size,
 311                                         DMA_TO_DEVICE);
 312                 async_tx_ack(dma->tx_desc);
 313                 count = dma->tx_bytes_requested - state.residue;
 314                 uart_xmit_advance(port, count);
 315         }
 316
 317         ourport->tx_enabled = 0;
 318         ourport->tx_in_progress = 0;
 319
 320         if (port->flags & UPF_CONS_FLOW)
 321                 s3c24xx_serial_rx_enable(port);
 322
 323         ourport->tx_mode = 0;
 324 }
 325
 326 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
 327
 328 static void s3c24xx_serial_tx_dma_complete(void *args)
 329 {
 330         struct s3c24xx_uart_port *ourport = args;
 331         struct uart_port *port = &ourport->port;
 332         struct tty_port *tport = &port->state->port;
 333         struct s3c24xx_uart_dma *dma = ourport->dma;
 334         struct dma_tx_state state;
 335         unsigned long flags;
 336         int count;
 337
 338         dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
 339         count = dma->tx_bytes_requested - state.residue;
 340         async_tx_ack(dma->tx_desc);
 341
 342         dma_sync_single_for_cpu(dma->tx_chan->device->dev,
 343                                 dma->tx_transfer_addr, dma->tx_size,
 344                                 DMA_TO_DEVICE);
 345
 346         uart_port_lock_irqsave(port, &flags);
 347
 348         uart_xmit_advance(port, count);
 349         ourport->tx_in_progress = 0;
 350
 351         if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
 352                 uart_write_wakeup(port);
 353
 354         s3c24xx_serial_start_next_tx(ourport);
 355         uart_port_unlock_irqrestore(port, flags);
 356 }
 357
 358 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
 359 {
 360         const struct uart_port *port = &ourport->port;
 361         u32 ucon;
 362
 363         /* Mask Tx interrupt */
 364         switch (ourport->info->type) {
 365         case TYPE_S3C6400:
 366                 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
 367                 break;
 368         case TYPE_APPLE_S5L:
 369                 WARN_ON(1); // No DMA
 370                 break;
 371         default:
 372                 disable_irq_nosync(ourport->tx_irq);
 373                 break;
 374         }
 375
 376         /* Enable tx dma mode */
 377         ucon = rd_regl(port, S3C2410_UCON);
 378         ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
 379         ucon |= S3C64XX_UCON_TXBURST_1;
 380         ucon |= S3C64XX_UCON_TXMODE_DMA;
 381         wr_regl(port,  S3C2410_UCON, ucon);
 382
 383         ourport->tx_mode = S3C24XX_TX_DMA;
 384 }
 385
 386 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
 387 {
 388         const struct uart_port *port = &ourport->port;
 389         u32 ucon, ufcon;
 390
 391         /* Set ufcon txtrig */
 392         ourport->tx_in_progress = S3C24XX_TX_PIO;
 393         ufcon = rd_regl(port, S3C2410_UFCON);
 394         wr_regl(port,  S3C2410_UFCON, ufcon);
 395
 396         /* Enable tx pio mode */
 397         ucon = rd_regl(port, S3C2410_UCON);
 398         ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
 399         ucon |= S3C64XX_UCON_TXMODE_CPU;
 400         wr_regl(port,  S3C2410_UCON, ucon);
 401
 402         /* Unmask Tx interrupt */
 403         switch (ourport->info->type) {
 404         case TYPE_S3C6400:
 405                 s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
 406                                   S3C64XX_UINTM);
 407                 break;
 408         case TYPE_APPLE_S5L:
 409                 ucon |= APPLE_S5L_UCON_TXTHRESH_ENA_MSK;
 410                 wr_regl(port, S3C2410_UCON, ucon);
 411                 break;
 412         default:
 413                 enable_irq(ourport->tx_irq);
 414                 break;
 415         }
 416
 417         ourport->tx_mode = S3C24XX_TX_PIO;
 418
 419         /*
 420          * The Apple version only has edge triggered TX IRQs, so we need
 421          * to kick off the process by sending some characters here.
 422          */
 423         if (ourport->info->type == TYPE_APPLE_S5L)
 424                 s3c24xx_serial_tx_chars(ourport);
 425 }
 426
 427 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
 428 {
 429         if (ourport->tx_mode != S3C24XX_TX_PIO)
 430                 enable_tx_pio(ourport);
 431 }
 432
 433 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
 434                                       unsigned int count, unsigned int tail)
 435 {
 436         struct s3c24xx_uart_dma *dma = ourport->dma;
 437
 438         if (ourport->tx_mode != S3C24XX_TX_DMA)
 439                 enable_tx_dma(ourport);
 440
 441         dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
 442         dma->tx_transfer_addr = dma->tx_addr + tail;
 443
 444         dma_sync_single_for_device(dma->tx_chan->device->dev,
 445                                    dma->tx_transfer_addr, dma->tx_size,
 446                                    DMA_TO_DEVICE);
 447
 448         dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
 449                                 dma->tx_transfer_addr, dma->tx_size,
 450                                 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
 451         if (!dma->tx_desc) {
 452                 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
 453                 return -EIO;
 454         }
 455
 456         dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
 457         dma->tx_desc->callback_param = ourport;
 458         dma->tx_bytes_requested = dma->tx_size;
 459
 460         ourport->tx_in_progress = S3C24XX_TX_DMA;
 461         dma->tx_cookie = dmaengine_submit(dma->tx_desc);
 462         dma_async_issue_pending(dma->tx_chan);
 463         return 0;
 464 }
 465
 466 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
 467 {
 468         struct uart_port *port = &ourport->port;
 469         struct tty_port *tport = &port->state->port;
 470         unsigned int count, tail;
 471
 472         /* Get data size up to the end of buffer */
 473         count = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE);
 474
 475         if (!count) {
 476                 s3c24xx_serial_stop_tx(port);
 477                 return;
 478         }
 479
 480         if (!ourport->dma || !ourport->dma->tx_chan ||
 481             count < ourport->min_dma_size ||
 482             tail & (dma_get_cache_alignment() - 1))
 483                 s3c24xx_serial_start_tx_pio(ourport);
 484         else
 485                 s3c24xx_serial_start_tx_dma(ourport, count, tail);
 486 }
 487
 488 static void s3c24xx_serial_start_tx(struct uart_port *port)
 489 {
 490         struct s3c24xx_uart_port *ourport = to_ourport(port);
 491         struct tty_port *tport = &port->state->port;
 492
 493         if (!ourport->tx_enabled) {
 494                 if (port->flags & UPF_CONS_FLOW)
 495                         s3c24xx_serial_rx_disable(port);
 496
 497                 ourport->tx_enabled = 1;
 498                 if (!ourport->dma || !ourport->dma->tx_chan)
 499                         s3c24xx_serial_start_tx_pio(ourport);
 500         }
 501
 502         if (ourport->dma && ourport->dma->tx_chan) {
 503                 if (!kfifo_is_empty(&tport->xmit_fifo) &&
 504                                 !ourport->tx_in_progress)
 505                         s3c24xx_serial_start_next_tx(ourport);
 506         }
 507 }
 508
 509 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
 510                 struct tty_port *tty, int count)
 511 {
 512         struct s3c24xx_uart_dma *dma = ourport->dma;
 513         int copied;
 514
 515         if (!count)
 516                 return;
 517
 518         dma_sync_single_for_cpu(dma->rx_chan->device->dev, dma->rx_addr,
 519                                 dma->rx_size, DMA_FROM_DEVICE);
 520
 521         ourport->port.icount.rx += count;
 522         if (!tty) {
 523                 dev_err(ourport->port.dev, "No tty port\n");
 524                 return;
 525         }
 526         copied = tty_insert_flip_string(tty,
 527                         ((unsigned char *)(ourport->dma->rx_buf)), count);
 528         if (copied != count) {
 529                 WARN_ON(1);
 530                 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
 531         }
 532 }
 533
 534 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 535 {
 536         struct s3c24xx_uart_port *ourport = to_ourport(port);
 537         struct s3c24xx_uart_dma *dma = ourport->dma;
 538         struct tty_port *t = &port->state->port;
 539         struct dma_tx_state state;
 540         enum dma_status dma_status;
 541         unsigned int received;
 542
 543         if (ourport->rx_enabled) {
 544                 dev_dbg(port->dev, "stopping rx\n");
 545                 switch (ourport->info->type) {
 546                 case TYPE_S3C6400:
 547                         s3c24xx_set_bit(port, S3C64XX_UINTM_RXD,
 548                                         S3C64XX_UINTM);
 549                         break;
 550                 case TYPE_APPLE_S5L:
 551                         s3c24xx_clear_bit(port, APPLE_S5L_UCON_RXTHRESH_ENA, S3C2410_UCON);
 552                         s3c24xx_clear_bit(port, APPLE_S5L_UCON_RXTO_ENA, S3C2410_UCON);
 553                         break;
 554                 default:
 555                         disable_irq_nosync(ourport->rx_irq);
 556                         break;
 557                 }
 558                 ourport->rx_enabled = 0;
 559         }
 560         if (dma && dma->rx_chan) {
 561                 dmaengine_pause(dma->tx_chan);
 562                 dma_status = dmaengine_tx_status(dma->rx_chan,
 563                                 dma->rx_cookie, &state);
 564                 if (dma_status == DMA_IN_PROGRESS ||
 565                         dma_status == DMA_PAUSED) {
 566                         received = dma->rx_bytes_requested - state.residue;
 567                         dmaengine_terminate_all(dma->rx_chan);
 568                         s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 569                 }
 570         }
 571 }
 572
 573 static inline const struct s3c24xx_uart_info
 574         *s3c24xx_port_to_info(struct uart_port *port)
 575 {
 576         return to_ourport(port)->info;
 577 }
 578
 579 static inline const struct s3c2410_uartcfg
 580         *s3c24xx_port_to_cfg(const struct uart_port *port)
 581 {
 582         const struct s3c24xx_uart_port *ourport;
 583
 584         if (port->dev == NULL)
 585                 return NULL;
 586
 587         ourport = container_of(port, struct s3c24xx_uart_port, port);
 588         return ourport->cfg;
 589 }
 590
 591 static unsigned int
 592 s3c24xx_serial_rx_fifocnt(const struct s3c24xx_uart_port *ourport, u32 ufstat)
 593 {
 594         const struct s3c24xx_uart_info *info = ourport->info;
 595
 596         if (ufstat & info->rx_fifofull)
 597                 return ourport->port.fifosize;
 598
 599         return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
 600 }
 601
 602 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
 603 static void s3c24xx_serial_rx_dma_complete(void *args)
 604 {
 605         struct s3c24xx_uart_port *ourport = args;
 606         struct uart_port *port = &ourport->port;
 607
 608         struct s3c24xx_uart_dma *dma = ourport->dma;
 609         struct tty_port *t = &port->state->port;
 610         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 611
 612         struct dma_tx_state state;
 613         unsigned long flags;
 614         int received;
 615
 616         dmaengine_tx_status(dma->rx_chan,  dma->rx_cookie, &state);
 617         received  = dma->rx_bytes_requested - state.residue;
 618         async_tx_ack(dma->rx_desc);
 619
 620         uart_port_lock_irqsave(port, &flags);
 621
 622         if (received)
 623                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 624
 625         if (tty) {
 626                 tty_flip_buffer_push(t);
 627                 tty_kref_put(tty);
 628         }
 629
 630         s3c64xx_start_rx_dma(ourport);
 631
 632         uart_port_unlock_irqrestore(port, flags);
 633 }
 634
 635 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
 636 {
 637         struct s3c24xx_uart_dma *dma = ourport->dma;
 638
 639         dma_sync_single_for_device(dma->rx_chan->device->dev, dma->rx_addr,
 640                                    dma->rx_size, DMA_FROM_DEVICE);
 641
 642         dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
 643                                 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
 644                                 DMA_PREP_INTERRUPT);
 645         if (!dma->rx_desc) {
 646                 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
 647                 return;
 648         }
 649
 650         dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
 651         dma->rx_desc->callback_param = ourport;
 652         dma->rx_bytes_requested = dma->rx_size;
 653
 654         dma->rx_cookie = dmaengine_submit(dma->rx_desc);
 655         dma_async_issue_pending(dma->rx_chan);
 656 }
 657
 658 /* ? - where has parity gone?? */
 659 #define S3C2410_UERSTAT_PARITY (0x1000)
 660
 661 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
 662 {
 663         struct uart_port *port = &ourport->port;
 664         u32 ucon;
 665
 666         /* set Rx mode to DMA mode */
 667         ucon = rd_regl(port, S3C2410_UCON);
 668         ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
 669                         S3C64XX_UCON_TIMEOUT_MASK |
 670                         S3C64XX_UCON_EMPTYINT_EN |
 671                         S3C64XX_UCON_DMASUS_EN |
 672                         S3C64XX_UCON_TIMEOUT_EN |
 673                         S3C64XX_UCON_RXMODE_MASK);
 674         ucon |= S3C64XX_UCON_RXBURST_1 |
 675                         0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 676                         S3C64XX_UCON_EMPTYINT_EN |
 677                         S3C64XX_UCON_TIMEOUT_EN |
 678                         S3C64XX_UCON_RXMODE_DMA;
 679         wr_regl(port, S3C2410_UCON, ucon);
 680
 681         ourport->rx_mode = S3C24XX_RX_DMA;
 682 }
 683
 684 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
 685 {
 686         struct uart_port *port = &ourport->port;
 687         u32 ucon;
 688
 689         /* set Rx mode to DMA mode */
 690         ucon = rd_regl(port, S3C2410_UCON);
 691         ucon &= ~S3C64XX_UCON_RXMODE_MASK;
 692         ucon |= S3C64XX_UCON_RXMODE_CPU;
 693
 694         /* Apple types use these bits for IRQ masks */
 695         if (ourport->info->type != TYPE_APPLE_S5L) {
 696                 ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
 697                                 S3C64XX_UCON_EMPTYINT_EN |
 698                                 S3C64XX_UCON_DMASUS_EN |
 699                                 S3C64XX_UCON_TIMEOUT_EN);
 700                 ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
 701                                 S3C64XX_UCON_TIMEOUT_EN;
 702         }
 703         wr_regl(port, S3C2410_UCON, ucon);
 704
 705         ourport->rx_mode = S3C24XX_RX_PIO;
 706 }
 707
 708 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
 709
 710 static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
 711 {
 712         struct s3c24xx_uart_port *ourport = dev_id;
 713         struct uart_port *port = &ourport->port;
 714         struct s3c24xx_uart_dma *dma = ourport->dma;
 715         struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
 716         struct tty_port *t = &port->state->port;
 717         struct dma_tx_state state;
 718         unsigned int received;
 719         u32 utrstat;
 720
 721         utrstat = rd_regl(port, S3C2410_UTRSTAT);
 722         rd_regl(port, S3C2410_UFSTAT);
 723
 724         uart_port_lock(port);
 725
 726         if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
 727                 s3c64xx_start_rx_dma(ourport);
 728                 if (ourport->rx_mode == S3C24XX_RX_PIO)
 729                         enable_rx_dma(ourport);
 730                 goto finish;
 731         }
 732
 733         if (ourport->rx_mode == S3C24XX_RX_DMA) {
 734                 dmaengine_pause(dma->rx_chan);
 735                 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
 736                 dmaengine_terminate_all(dma->rx_chan);
 737                 received = dma->rx_bytes_requested - state.residue;
 738                 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
 739
 740                 enable_rx_pio(ourport);
 741         }
 742
 743         s3c24xx_serial_rx_drain_fifo(ourport);
 744
 745         if (tty) {
 746                 tty_flip_buffer_push(t);
 747                 tty_kref_put(tty);
 748         }
 749
 750         wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
 751
 752 finish:
 753         uart_port_unlock(port);
 754
 755         return IRQ_HANDLED;
 756 }
 757
 758 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
 759 {
 760         struct uart_port *port = &ourport->port;
 761         unsigned int max_count = port->fifosize;
 762         unsigned int fifocnt = 0;
 763         u32 ufcon, ufstat, uerstat;
 764         u8 ch, flag;
 765
 766         while (max_count-- > 0) {
 767                 /*
 768                  * Receive all characters known to be in FIFO
 769                  * before reading FIFO level again
 770                  */
 771                 if (fifocnt == 0) {
 772                         ufstat = rd_regl(port, S3C2410_UFSTAT);
 773                         fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
 774                         if (fifocnt == 0)
 775                                 break;
 776                 }
 777                 fifocnt--;
 778
 779                 uerstat = rd_regl(port, S3C2410_UERSTAT);
 780                 ch = rd_reg(port, S3C2410_URXH);
 781
 782                 if (port->flags & UPF_CONS_FLOW) {
 783                         bool txe = s3c24xx_serial_txempty_nofifo(port);
 784
 785                         if (ourport->rx_enabled) {
 786                                 if (!txe) {
 787                                         ourport->rx_enabled = 0;
 788                                         continue;
 789                                 }
 790                         } else {
 791                                 if (txe) {
 792                                         ufcon = rd_regl(port, S3C2410_UFCON);
 793                                         ufcon |= S3C2410_UFCON_RESETRX;
 794                                         wr_regl(port, S3C2410_UFCON, ufcon);
 795                                         ourport->rx_enabled = 1;
 796                                         return;
 797                                 }
 798                                 continue;
 799                         }
 800                 }
 801
 802                 /* insert the character into the buffer */
 803
 804                 flag = TTY_NORMAL;
 805                 port->icount.rx++;
 806
 807                 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
 808                         dev_dbg(port->dev,
 809                                 "rxerr: port ch=0x%02x, rxs=0x%08x\n",
 810                                 ch, uerstat);
 811
 812                         /* check for break */
 813                         if (uerstat & S3C2410_UERSTAT_BREAK) {
 814                                 dev_dbg(port->dev, "break!\n");
 815                                 port->icount.brk++;
 816                                 if (uart_handle_break(port))
 817                                         continue; /* Ignore character */
 818                         }
 819
 820                         if (uerstat & S3C2410_UERSTAT_FRAME)
 821                                 port->icount.frame++;
 822                         if (uerstat & S3C2410_UERSTAT_OVERRUN)
 823                                 port->icount.overrun++;
 824
 825                         uerstat &= port->read_status_mask;
 826
 827                         if (uerstat & S3C2410_UERSTAT_BREAK)
 828                                 flag = TTY_BREAK;
 829                         else if (uerstat & S3C2410_UERSTAT_PARITY)
 830                                 flag = TTY_PARITY;
 831                         else if (uerstat & (S3C2410_UERSTAT_FRAME |
 832                                             S3C2410_UERSTAT_OVERRUN))
 833                                 flag = TTY_FRAME;
 834                 }
 835
 836                 if (uart_handle_sysrq_char(port, ch))
 837                         continue; /* Ignore character */
 838
 839                 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
 840                                  ch, flag);
 841         }
 842
 843         tty_flip_buffer_push(&port->state->port);
 844 }
 845
 846 static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
 847 {
 848         struct s3c24xx_uart_port *ourport = dev_id;
 849         struct uart_port *port = &ourport->port;
 850
 851         uart_port_lock(port);
 852         s3c24xx_serial_rx_drain_fifo(ourport);
 853         uart_port_unlock(port);
 854
 855         return IRQ_HANDLED;
 856 }
 857
 858 static irqreturn_t s3c24xx_serial_rx_irq(int irq, void *dev_id)
 859 {
 860         struct s3c24xx_uart_port *ourport = dev_id;
 861
 862         if (ourport->dma && ourport->dma->rx_chan)
 863                 return s3c24xx_serial_rx_chars_dma(dev_id);
 864         return s3c24xx_serial_rx_chars_pio(dev_id);
 865 }
 866
 867 static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport)
 868 {
 869         struct uart_port *port = &ourport->port;
 870         struct tty_port *tport = &port->state->port;
 871         unsigned int count, dma_count = 0, tail;
 872
 873         count = kfifo_out_linear(&tport->xmit_fifo, &tail, UART_XMIT_SIZE);
 874
 875         if (ourport->dma && ourport->dma->tx_chan &&
 876             count >= ourport->min_dma_size) {
 877                 int align = dma_get_cache_alignment() -
 878                         (tail & (dma_get_cache_alignment() - 1));
 879                 if (count - align >= ourport->min_dma_size) {
 880                         dma_count = count - align;
 881                         count = align;
 882                         tail += align;
 883                 }
 884         }
 885
 886         if (port->x_char) {
 887                 wr_reg(port, S3C2410_UTXH, port->x_char);
 888                 port->icount.tx++;
 889                 port->x_char = 0;
 890                 return;
 891         }
 892
 893         /* if there isn't anything more to transmit, or the uart is now
 894          * stopped, disable the uart and exit
 895          */
 896
 897         if (kfifo_is_empty(&tport->xmit_fifo) || uart_tx_stopped(port)) {
 898                 s3c24xx_serial_stop_tx(port);
 899                 return;
 900         }
 901
 902         /* try and drain the buffer... */
 903
 904         if (count > port->fifosize) {
 905                 count = port->fifosize;
 906                 dma_count = 0;
 907         }
 908
 909         while (!(rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)) {
 910                 unsigned char ch;
 911
 912                 if (!uart_fifo_get(port, &ch))
 913                         break;
 914
 915                 wr_reg(port, S3C2410_UTXH, ch);
 916                 count--;
 917         }
 918
 919         if (!count && dma_count) {
 920                 s3c24xx_serial_start_tx_dma(ourport, dma_count, tail);
 921                 return;
 922         }
 923
 924         if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
 925                 uart_write_wakeup(port);
 926
 927         if (kfifo_is_empty(&tport->xmit_fifo))
 928                 s3c24xx_serial_stop_tx(port);
 929 }
 930
 931 static irqreturn_t s3c24xx_serial_tx_irq(int irq, void *id)
 932 {
 933         struct s3c24xx_uart_port *ourport = id;
 934         struct uart_port *port = &ourport->port;
 935
 936         uart_port_lock(port);
 937
 938         s3c24xx_serial_tx_chars(ourport);
 939
 940         uart_port_unlock(port);
 941         return IRQ_HANDLED;
 942 }
 943
 944 /* interrupt handler for s3c64xx and later SoC's.*/
 945 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
 946 {
 947         const struct s3c24xx_uart_port *ourport = id;
 948         const struct uart_port *port = &ourport->port;
 949         u32 pend = rd_regl(port, S3C64XX_UINTP);
 950         irqreturn_t ret = IRQ_HANDLED;
 951
 952         if (pend & S3C64XX_UINTM_RXD_MSK) {
 953                 ret = s3c24xx_serial_rx_irq(irq, id);
 954                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
 955         }
 956         if (pend & S3C64XX_UINTM_TXD_MSK) {
 957                 ret = s3c24xx_serial_tx_irq(irq, id);
 958                 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
 959         }
 960         return ret;
 961 }
 962
 963 /* interrupt handler for Apple SoC's.*/
 964 static irqreturn_t apple_serial_handle_irq(int irq, void *id)
 965 {
 966         const struct s3c24xx_uart_port *ourport = id;
 967         const struct uart_port *port = &ourport->port;
 968         u32 pend = rd_regl(port, S3C2410_UTRSTAT);
 969         irqreturn_t ret = IRQ_NONE;
 970
 971         if (pend & (APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO)) {
 972                 wr_regl(port, S3C2410_UTRSTAT,
 973                         APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO);
 974                 ret = s3c24xx_serial_rx_irq(irq, id);
 975         }
 976         if (pend & APPLE_S5L_UTRSTAT_TXTHRESH) {
 977                 wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_TXTHRESH);
 978                 ret = s3c24xx_serial_tx_irq(irq, id);
 979         }
 980
 981         return ret;
 982 }
 983
 984 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 985 {
 986         const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 987         u32 ufstat = rd_regl(port, S3C2410_UFSTAT);
 988         u32 ufcon = rd_regl(port, S3C2410_UFCON);
 989
 990         if (ufcon & S3C2410_UFCON_FIFOMODE) {
 991                 if ((ufstat & info->tx_fifomask) ||
 992                     (ufstat & info->tx_fifofull))
 993                         return 0;
 994                 return TIOCSER_TEMT;
 995         }
 996
 997         return s3c24xx_serial_txempty_nofifo(port) ? TIOCSER_TEMT : 0;
 998 }
 999
1000 /* no modem control lines */
1001 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
1002 {
1003         u32 umstat = rd_reg(port, S3C2410_UMSTAT);
1004
1005         if (umstat & S3C2410_UMSTAT_CTS)
1006                 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
1007         else
1008                 return TIOCM_CAR | TIOCM_DSR;
1009 }
1010
1011 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
1012 {
1013         u32 umcon = rd_regl(port, S3C2410_UMCON);
1014         u32 ucon = rd_regl(port, S3C2410_UCON);
1015
1016         if (mctrl & TIOCM_RTS)
1017                 umcon |= S3C2410_UMCOM_RTS_LOW;
1018         else
1019                 umcon &= ~S3C2410_UMCOM_RTS_LOW;
1020
1021         wr_regl(port, S3C2410_UMCON, umcon);
1022
1023         if (mctrl & TIOCM_LOOP)
1024                 ucon |= S3C2410_UCON_LOOPBACK;
1025         else
1026                 ucon &= ~S3C2410_UCON_LOOPBACK;
1027
1028         wr_regl(port, S3C2410_UCON, ucon);
1029 }
1030
1031 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
1032 {
1033         unsigned long flags;
1034         u32 ucon;
1035
1036         uart_port_lock_irqsave(port, &flags);
1037
1038         ucon = rd_regl(port, S3C2410_UCON);
1039
1040         if (break_state)
1041                 ucon |= S3C2410_UCON_SBREAK;
1042         else
1043                 ucon &= ~S3C2410_UCON_SBREAK;
1044
1045         wr_regl(port, S3C2410_UCON, ucon);
1046
1047         uart_port_unlock_irqrestore(port, flags);
1048 }
1049
1050 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
1051 {
1052         struct s3c24xx_uart_dma *dma = p->dma;
1053         struct dma_slave_caps dma_caps;
1054         const char *reason = NULL;
1055         int ret;
1056
1057         /* Default slave configuration parameters */
1058         dma->rx_conf.direction          = DMA_DEV_TO_MEM;
1059         dma->rx_conf.src_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
1060         dma->rx_conf.src_addr           = p->port.mapbase + S3C2410_URXH;
1061         dma->rx_conf.src_maxburst       = 1;
1062
1063         dma->tx_conf.direction          = DMA_MEM_TO_DEV;
1064         dma->tx_conf.dst_addr_width     = DMA_SLAVE_BUSWIDTH_1_BYTE;
1065         dma->tx_conf.dst_addr           = p->port.mapbase + S3C2410_UTXH;
1066         dma->tx_conf.dst_maxburst       = 1;
1067
1068         dma->rx_chan = dma_request_chan(p->port.dev, "rx");
1069
1070         if (IS_ERR(dma->rx_chan)) {
1071                 reason = "DMA RX channel request failed";
1072                 ret = PTR_ERR(dma->rx_chan);
1073                 goto err_warn;
1074         }
1075
1076         ret = dma_get_slave_caps(dma->rx_chan, &dma_caps);
1077         if (ret < 0 ||
1078             dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
1079                 reason = "insufficient DMA RX engine capabilities";
1080                 ret = -EOPNOTSUPP;
1081                 goto err_release_rx;
1082         }
1083
1084         dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
1085
1086         dma->tx_chan = dma_request_chan(p->port.dev, "tx");
1087         if (IS_ERR(dma->tx_chan)) {
1088                 reason = "DMA TX channel request failed";
1089                 ret = PTR_ERR(dma->tx_chan);
1090                 goto err_release_rx;
1091         }
1092
1093         ret = dma_get_slave_caps(dma->tx_chan, &dma_caps);
1094         if (ret < 0 ||
1095             dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
1096                 reason = "insufficient DMA TX engine capabilities";
1097                 ret = -EOPNOTSUPP;
1098                 goto err_release_tx;
1099         }
1100
1101         dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
1102
1103         /* RX buffer */
1104         dma->rx_size = PAGE_SIZE;
1105
1106         dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
1107         if (!dma->rx_buf) {
1108                 ret = -ENOMEM;
1109                 goto err_release_tx;
1110         }
1111
1112         dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
1113                                       dma->rx_size, DMA_FROM_DEVICE);
1114         if (dma_mapping_error(dma->rx_chan->device->dev, dma->rx_addr)) {
1115                 reason = "DMA mapping error for RX buffer";
1116                 ret = -EIO;
1117                 goto err_free_rx;
1118         }
1119
1120         /* TX buffer */
1121         dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
1122                                       p->port.state->port.xmit_buf,
1123                                       UART_XMIT_SIZE,
1124                                       DMA_TO_DEVICE);
1125         if (dma_mapping_error(dma->tx_chan->device->dev, dma->tx_addr)) {
1126                 reason = "DMA mapping error for TX buffer";
1127                 ret = -EIO;
1128                 goto err_unmap_rx;
1129         }
1130
1131         return 0;
1132
1133 err_unmap_rx:
1134         dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
1135                          dma->rx_size, DMA_FROM_DEVICE);
1136 err_free_rx:
1137         kfree(dma->rx_buf);
1138 err_release_tx:
1139         dma_release_channel(dma->tx_chan);
1140 err_release_rx:
1141         dma_release_channel(dma->rx_chan);
1142 err_warn:
1143         if (reason)
1144                 dev_warn(p->port.dev, "%s, DMA will not be used\n", reason);
1145         return ret;
1146 }
1147
1148 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
1149 {
1150         struct s3c24xx_uart_dma *dma = p->dma;
1151
1152         if (dma->rx_chan) {
1153                 dmaengine_terminate_all(dma->rx_chan);
1154                 dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
1155                                  dma->rx_size, DMA_FROM_DEVICE);
1156                 kfree(dma->rx_buf);
1157                 dma_release_channel(dma->rx_chan);
1158                 dma->rx_chan = NULL;
1159         }
1160
1161         if (dma->tx_chan) {
1162                 dmaengine_terminate_all(dma->tx_chan);
1163                 dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
1164                                  UART_XMIT_SIZE, DMA_TO_DEVICE);
1165                 dma_release_channel(dma->tx_chan);
1166                 dma->tx_chan = NULL;
1167         }
1168 }
1169
1170 static void s3c64xx_serial_shutdown(struct uart_port *port)
1171 {
1172         struct s3c24xx_uart_port *ourport = to_ourport(port);
1173
1174         ourport->tx_enabled = 0;
1175         ourport->tx_mode = 0;
1176         ourport->rx_enabled = 0;
1177
1178         free_irq(port->irq, ourport);
1179
1180         wr_regl(port, S3C64XX_UINTP, 0xf);
1181         wr_regl(port, S3C64XX_UINTM, 0xf);
1182
1183         if (ourport->dma)
1184                 s3c24xx_serial_release_dma(ourport);
1185
1186         ourport->tx_in_progress = 0;
1187 }
1188
1189 static void apple_s5l_serial_shutdown(struct uart_port *port)
1190 {
1191         struct s3c24xx_uart_port *ourport = to_ourport(port);
1192
1193         u32 ucon;
1194
1195         ucon = rd_regl(port, S3C2410_UCON);
1196         ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
1197                   APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
1198                   APPLE_S5L_UCON_RXTO_ENA_MSK);
1199         wr_regl(port, S3C2410_UCON, ucon);
1200
1201         wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
1202
1203         free_irq(port->irq, ourport);
1204
1205         ourport->tx_enabled = 0;
1206         ourport->tx_mode = 0;
1207         ourport->rx_enabled = 0;
1208
1209         if (ourport->dma)
1210                 s3c24xx_serial_release_dma(ourport);
1211
1212         ourport->tx_in_progress = 0;
1213 }
1214
1215 static int s3c64xx_serial_startup(struct uart_port *port)
1216 {
1217         struct s3c24xx_uart_port *ourport = to_ourport(port);
1218         unsigned long flags;
1219         u32 ufcon;
1220         int ret;
1221
1222         wr_regl(port, S3C64XX_UINTM, 0xf);
1223         if (ourport->dma) {
1224                 ret = s3c24xx_serial_request_dma(ourport);
1225                 if (ret < 0) {
1226                         devm_kfree(port->dev, ourport->dma);
1227                         ourport->dma = NULL;
1228                 }
1229         }
1230
1231         ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1232                           s3c24xx_serial_portname(port), ourport);
1233         if (ret) {
1234                 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1235                 return ret;
1236         }
1237
1238         /* For compatibility with s3c24xx Soc's */
1239         ourport->rx_enabled = 1;
1240         ourport->tx_enabled = 0;
1241
1242         uart_port_lock_irqsave(port, &flags);
1243
1244         ufcon = rd_regl(port, S3C2410_UFCON);
1245         ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1246         if (!uart_console(port))
1247                 ufcon |= S3C2410_UFCON_RESETTX;
1248         wr_regl(port, S3C2410_UFCON, ufcon);
1249
1250         enable_rx_pio(ourport);
1251
1252         uart_port_unlock_irqrestore(port, flags);
1253
1254         /* Enable Rx Interrupt */
1255         s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM);
1256
1257         return ret;
1258 }
1259
1260 static int apple_s5l_serial_startup(struct uart_port *port)
1261 {
1262         struct s3c24xx_uart_port *ourport = to_ourport(port);
1263         unsigned long flags;
1264         u32 ufcon;
1265         int ret;
1266
1267         wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
1268
1269         ret = request_irq(port->irq, apple_serial_handle_irq, 0,
1270                           s3c24xx_serial_portname(port), ourport);
1271         if (ret) {
1272                 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1273                 return ret;
1274         }
1275
1276         /* For compatibility with s3c24xx Soc's */
1277         ourport->rx_enabled = 1;
1278         ourport->tx_enabled = 0;
1279
1280         uart_port_lock_irqsave(port, &flags);
1281
1282         ufcon = rd_regl(port, S3C2410_UFCON);
1283         ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1284         if (!uart_console(port))
1285                 ufcon |= S3C2410_UFCON_RESETTX;
1286         wr_regl(port, S3C2410_UFCON, ufcon);
1287
1288         enable_rx_pio(ourport);
1289
1290         uart_port_unlock_irqrestore(port, flags);
1291
1292         /* Enable Rx Interrupt */
1293         s3c24xx_set_bit(port, APPLE_S5L_UCON_RXTHRESH_ENA, S3C2410_UCON);
1294         s3c24xx_set_bit(port, APPLE_S5L_UCON_RXTO_ENA, S3C2410_UCON);
1295
1296         return ret;
1297 }
1298
1299 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1300                               unsigned int old)
1301 {
1302         struct s3c24xx_uart_port *ourport = to_ourport(port);
1303         int timeout = 10000;
1304
1305         ourport->pm_level = level;
1306
1307         switch (level) {
1308         case 3:
1309                 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1310                         udelay(100);
1311
1312                 if (!IS_ERR(ourport->baudclk))
1313                         clk_disable_unprepare(ourport->baudclk);
1314
1315                 clk_disable_unprepare(ourport->clk);
1316                 break;
1317
1318         case 0:
1319                 clk_prepare_enable(ourport->clk);
1320
1321                 if (!IS_ERR(ourport->baudclk))
1322                         clk_prepare_enable(ourport->baudclk);
1323                 break;
1324         default:
1325                 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1326         }
1327 }
1328
1329 /* baud rate calculation
1330  *
1331  * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1332  * of different sources, including the peripheral clock ("pclk") and an
1333  * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1334  * with a programmable extra divisor.
1335  *
1336  * The following code goes through the clock sources, and calculates the
1337  * baud clocks (and the resultant actual baud rates) and then tries to
1338  * pick the closest one and select that.
1339  *
1340  */
1341
1342 #define MAX_CLK_NAME_LENGTH 15
1343
1344 static inline u8 s3c24xx_serial_getsource(struct uart_port *port)
1345 {
1346         const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1347         u32 ucon;
1348
1349         if (info->num_clks == 1)
1350                 return 0;
1351
1352         ucon = rd_regl(port, S3C2410_UCON);
1353         ucon &= info->clksel_mask;
1354         return ucon >> info->clksel_shift;
1355 }
1356
1357 static void s3c24xx_serial_setsource(struct uart_port *port, u8 clk_sel)
1358 {
1359         const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1360         u32 ucon;
1361
1362         if (info->num_clks == 1)
1363                 return;
1364
1365         ucon = rd_regl(port, S3C2410_UCON);
1366         if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1367                 return;
1368
1369         ucon &= ~info->clksel_mask;
1370         ucon |= clk_sel << info->clksel_shift;
1371         wr_regl(port, S3C2410_UCON, ucon);
1372 }
1373
1374 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1375                         unsigned int req_baud, struct clk **best_clk,
1376                         u8 *clk_num)
1377 {
1378         const struct s3c24xx_uart_info *info = ourport->info;
1379         struct clk *clk;
1380         unsigned long rate;
1381         unsigned int baud, quot, best_quot = 0;
1382         char clkname[MAX_CLK_NAME_LENGTH];
1383         int calc_deviation, deviation = (1 << 30) - 1;
1384         u8 cnt;
1385
1386         for (cnt = 0; cnt < info->num_clks; cnt++) {
1387                 /* Keep selected clock if provided */
1388                 if (ourport->cfg->clk_sel &&
1389                         !(ourport->cfg->clk_sel & (1 << cnt)))
1390                         continue;
1391
1392                 sprintf(clkname, "clk_uart_baud%d", cnt);
1393                 clk = clk_get(ourport->port.dev, clkname);
1394                 if (IS_ERR(clk))
1395                         continue;
1396
1397                 rate = clk_get_rate(clk);
1398                 if (!rate) {
1399                         dev_err(ourport->port.dev,
1400                                 "Failed to get clock rate for %s.\n", clkname);
1401                         clk_put(clk);
1402                         continue;
1403                 }
1404
1405                 if (ourport->info->has_divslot) {
1406                         unsigned long div = rate / req_baud;
1407
1408                         /* The UDIVSLOT register on the newer UARTs allows us to
1409                          * get a divisor adjustment of 1/16th on the baud clock.
1410                          *
1411                          * We don't keep the UDIVSLOT value (the 16ths we
1412                          * calculated by not multiplying the baud by 16) as it
1413                          * is easy enough to recalculate.
1414                          */
1415
1416                         quot = div / 16;
1417                         baud = rate / div;
1418                 } else {
1419                         quot = (rate + (8 * req_baud)) / (16 * req_baud);
1420                         baud = rate / (quot * 16);
1421                 }
1422                 quot--;
1423
1424                 calc_deviation = abs(req_baud - baud);
1425
1426                 if (calc_deviation < deviation) {
1427                         /*
1428                          * If we find a better clk, release the previous one, if
1429                          * any.
1430                          */
1431                         if (!IS_ERR(*best_clk))
1432                                 clk_put(*best_clk);
1433                         *best_clk = clk;
1434                         best_quot = quot;
1435                         *clk_num = cnt;
1436                         deviation = calc_deviation;
1437                 } else {
1438                         clk_put(clk);
1439                 }
1440         }
1441
1442         return best_quot;
1443 }
1444
1445 /* udivslot_table[]
1446  *
1447  * This table takes the fractional value of the baud divisor and gives
1448  * the recommended setting for the UDIVSLOT register.
1449  */
1450 static const u16 udivslot_table[16] = {
1451         [0] = 0x0000,
1452         [1] = 0x0080,
1453         [2] = 0x0808,
1454         [3] = 0x0888,
1455         [4] = 0x2222,
1456         [5] = 0x4924,
1457         [6] = 0x4A52,
1458         [7] = 0x54AA,
1459         [8] = 0x5555,
1460         [9] = 0xD555,
1461         [10] = 0xD5D5,
1462         [11] = 0xDDD5,
1463         [12] = 0xDDDD,
1464         [13] = 0xDFDD,
1465         [14] = 0xDFDF,
1466         [15] = 0xFFDF,
1467 };
1468
1469 static void s3c24xx_serial_set_termios(struct uart_port *port,
1470                                        struct ktermios *termios,
1471                                        const struct ktermios *old)
1472 {
1473         const struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1474         struct s3c24xx_uart_port *ourport = to_ourport(port);
1475         struct clk *clk = ERR_PTR(-EINVAL);
1476         unsigned long flags;
1477         unsigned int baud, quot;
1478         unsigned int udivslot = 0;
1479         u32 ulcon, umcon;
1480         u8 clk_sel = 0;
1481
1482         /*
1483          * We don't support modem control lines.
1484          */
1485         termios->c_cflag &= ~(HUPCL | CMSPAR);
1486         termios->c_cflag |= CLOCAL;
1487
1488         /*
1489          * Ask the core to calculate the divisor for us.
1490          */
1491
1492         baud = uart_get_baud_rate(port, termios, old, 0, 3000000);
1493         quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1494         if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1495                 quot = port->custom_divisor;
1496         if (IS_ERR(clk))
1497                 return;
1498
1499         /* check to see if we need  to change clock source */
1500
1501         if (ourport->baudclk != clk) {
1502                 clk_prepare_enable(clk);
1503
1504                 s3c24xx_serial_setsource(port, clk_sel);
1505
1506                 if (!IS_ERR(ourport->baudclk)) {
1507                         clk_disable_unprepare(ourport->baudclk);
1508                         ourport->baudclk = ERR_PTR(-EINVAL);
1509                 }
1510
1511                 ourport->baudclk = clk;
1512                 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1513         }
1514
1515         if (ourport->info->has_divslot) {
1516                 unsigned int div = ourport->baudclk_rate / baud;
1517
1518                 if (cfg->has_fracval) {
1519                         udivslot = (div & 15);
1520                         dev_dbg(port->dev, "fracval = %04x\n", udivslot);
1521                 } else {
1522                         udivslot = udivslot_table[div & 15];
1523                         dev_dbg(port->dev, "udivslot = %04x (div %d)\n",
1524                                 udivslot, div & 15);
1525                 }
1526         }
1527
1528         switch (termios->c_cflag & CSIZE) {
1529         case CS5:
1530                 dev_dbg(port->dev, "config: 5bits/char\n");
1531                 ulcon = S3C2410_LCON_CS5;
1532                 break;
1533         case CS6:
1534                 dev_dbg(port->dev, "config: 6bits/char\n");
1535                 ulcon = S3C2410_LCON_CS6;
1536                 break;
1537         case CS7:
1538                 dev_dbg(port->dev, "config: 7bits/char\n");
1539                 ulcon = S3C2410_LCON_CS7;
1540                 break;
1541         case CS8:
1542         default:
1543                 dev_dbg(port->dev, "config: 8bits/char\n");
1544                 ulcon = S3C2410_LCON_CS8;
1545                 break;
1546         }
1547
1548         /* preserve original lcon IR settings */
1549         ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1550
1551         if (termios->c_cflag & CSTOPB)
1552                 ulcon |= S3C2410_LCON_STOPB;
1553
1554         if (termios->c_cflag & PARENB) {
1555                 if (termios->c_cflag & PARODD)
1556                         ulcon |= S3C2410_LCON_PODD;
1557                 else
1558                         ulcon |= S3C2410_LCON_PEVEN;
1559         } else {
1560                 ulcon |= S3C2410_LCON_PNONE;
1561         }
1562
1563         uart_port_lock_irqsave(port, &flags);
1564
1565         dev_dbg(port->dev,
1566                 "setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1567                 ulcon, quot, udivslot);
1568
1569         wr_regl(port, S3C2410_ULCON, ulcon);
1570         wr_regl(port, S3C2410_UBRDIV, quot);
1571
1572         port->status &= ~UPSTAT_AUTOCTS;
1573
1574         umcon = rd_regl(port, S3C2410_UMCON);
1575         if (termios->c_cflag & CRTSCTS) {
1576                 umcon |= S3C2410_UMCOM_AFC;
1577                 /* Disable RTS when RX FIFO contains 63 bytes */
1578                 umcon &= ~S3C2412_UMCON_AFC_8;
1579                 port->status = UPSTAT_AUTOCTS;
1580         } else {
1581                 umcon &= ~S3C2410_UMCOM_AFC;
1582         }
1583         wr_regl(port, S3C2410_UMCON, umcon);
1584
1585         if (ourport->info->has_divslot)
1586                 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1587
1588         dev_dbg(port->dev,
1589                 "uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1590                 rd_regl(port, S3C2410_ULCON),
1591                 rd_regl(port, S3C2410_UCON),
1592                 rd_regl(port, S3C2410_UFCON));
1593
1594         /*
1595          * Update the per-port timeout.
1596          */
1597         uart_update_timeout(port, termios->c_cflag, baud);
1598
1599         /*
1600          * Which character status flags are we interested in?
1601          */
1602         port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1603         if (termios->c_iflag & INPCK)
1604                 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1605                         S3C2410_UERSTAT_PARITY;
1606         /*
1607          * Which character status flags should we ignore?
1608          */
1609         port->ignore_status_mask = 0;
1610         if (termios->c_iflag & IGNPAR)
1611                 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1612         if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1613                 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1614
1615         /*
1616          * Ignore all characters if CREAD is not set.
1617          */
1618         if ((termios->c_cflag & CREAD) == 0)
1619                 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1620
1621         uart_port_unlock_irqrestore(port, flags);
1622 }
1623
1624 static const char *s3c24xx_serial_type(struct uart_port *port)
1625 {
1626         const struct s3c24xx_uart_port *ourport = to_ourport(port);
1627
1628         switch (ourport->info->type) {
1629         case TYPE_S3C6400:
1630                 return "S3C6400/10";
1631         case TYPE_APPLE_S5L:
1632                 return "APPLE S5L";
1633         default:
1634                 return NULL;
1635         }
1636 }
1637
1638 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1639 {
1640         const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1641
1642         if (flags & UART_CONFIG_TYPE)
1643                 port->type = info->port_type;
1644 }
1645
1646 /*
1647  * verify the new serial_struct (for TIOCSSERIAL).
1648  */
1649 static int
1650 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1651 {
1652         const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1653
1654         if (ser->type != PORT_UNKNOWN && ser->type != info->port_type)
1655                 return -EINVAL;
1656
1657         return 0;
1658 }
1659
1660 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1661
1662 static struct console s3c24xx_serial_console;
1663
1664 static void __init s3c24xx_serial_register_console(void)
1665 {
1666         register_console(&s3c24xx_serial_console);
1667 }
1668
1669 static void s3c24xx_serial_unregister_console(void)
1670 {
1671         if (console_is_registered(&s3c24xx_serial_console))
1672                 unregister_console(&s3c24xx_serial_console);
1673 }
1674
1675 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1676 #else
1677 static inline void s3c24xx_serial_register_console(void) { }
1678 static inline void s3c24xx_serial_unregister_console(void) { }
1679 #define S3C24XX_SERIAL_CONSOLE NULL
1680 #endif
1681
1682 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1683 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1684 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1685                          unsigned char c);
1686 #endif
1687
1688 static const struct uart_ops s3c64xx_serial_ops = {
1689         .pm             = s3c24xx_serial_pm,
1690         .tx_empty       = s3c24xx_serial_tx_empty,
1691         .get_mctrl      = s3c24xx_serial_get_mctrl,
1692         .set_mctrl      = s3c24xx_serial_set_mctrl,
1693         .stop_tx        = s3c24xx_serial_stop_tx,
1694         .start_tx       = s3c24xx_serial_start_tx,
1695         .stop_rx        = s3c24xx_serial_stop_rx,
1696         .break_ctl      = s3c24xx_serial_break_ctl,
1697         .startup        = s3c64xx_serial_startup,
1698         .shutdown       = s3c64xx_serial_shutdown,
1699         .set_termios    = s3c24xx_serial_set_termios,
1700         .type           = s3c24xx_serial_type,
1701         .config_port    = s3c24xx_serial_config_port,
1702         .verify_port    = s3c24xx_serial_verify_port,
1703 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1704         .poll_get_char = s3c24xx_serial_get_poll_char,
1705         .poll_put_char = s3c24xx_serial_put_poll_char,
1706 #endif
1707 };
1708
1709 static const struct uart_ops apple_s5l_serial_ops = {
1710         .pm             = s3c24xx_serial_pm,
1711         .tx_empty       = s3c24xx_serial_tx_empty,
1712         .get_mctrl      = s3c24xx_serial_get_mctrl,
1713         .set_mctrl      = s3c24xx_serial_set_mctrl,
1714         .stop_tx        = s3c24xx_serial_stop_tx,
1715         .start_tx       = s3c24xx_serial_start_tx,
1716         .stop_rx        = s3c24xx_serial_stop_rx,
1717         .break_ctl      = s3c24xx_serial_break_ctl,
1718         .startup        = apple_s5l_serial_startup,
1719         .shutdown       = apple_s5l_serial_shutdown,
1720         .set_termios    = s3c24xx_serial_set_termios,
1721         .type           = s3c24xx_serial_type,
1722         .config_port    = s3c24xx_serial_config_port,
1723         .verify_port    = s3c24xx_serial_verify_port,
1724 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1725         .poll_get_char = s3c24xx_serial_get_poll_char,
1726         .poll_put_char = s3c24xx_serial_put_poll_char,
1727 #endif
1728 };
1729
1730 static struct uart_driver s3c24xx_uart_drv = {
1731         .owner          = THIS_MODULE,
1732         .driver_name    = "s3c2410_serial",
1733         .nr             = UART_NR,
1734         .cons           = S3C24XX_SERIAL_CONSOLE,
1735         .dev_name       = S3C24XX_SERIAL_NAME,
1736         .major          = S3C24XX_SERIAL_MAJOR,
1737         .minor          = S3C24XX_SERIAL_MINOR,
1738 };
1739
1740 static struct s3c24xx_uart_port s3c24xx_serial_ports[UART_NR];
1741
1742 static void s3c24xx_serial_init_port_default(int index)
1743 {
1744         struct uart_port *port = &s3c24xx_serial_ports[index].port;
1745
1746         spin_lock_init(&port->lock);
1747
1748         port->uartclk = 0;
1749         port->fifosize = 16;
1750         port->flags = UPF_BOOT_AUTOCONF;
1751         port->line = index;
1752 }
1753
1754 /* s3c24xx_serial_resetport
1755  *
1756  * reset the fifos and other the settings.
1757  */
1758
1759 static void s3c24xx_serial_resetport(struct uart_port *port,
1760                                      const struct s3c2410_uartcfg *cfg)
1761 {
1762         const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1763         u32 ucon = rd_regl(port, S3C2410_UCON);
1764
1765         ucon &= (info->clksel_mask | info->ucon_mask);
1766         wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1767
1768         /* reset both fifos */
1769         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1770         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1771
1772         /* some delay is required after fifo reset */
1773         udelay(1);
1774 }
1775
1776 static int s3c24xx_serial_enable_baudclk(struct s3c24xx_uart_port *ourport)
1777 {
1778         struct device *dev = ourport->port.dev;
1779         const struct s3c24xx_uart_info *info = ourport->info;
1780         char clk_name[MAX_CLK_NAME_LENGTH];
1781         struct clk *clk;
1782         int ret;
1783         u8 clk_sel, clk_num;
1784
1785         clk_sel = ourport->cfg->clk_sel ? : info->def_clk_sel;
1786         for (clk_num = 0; clk_num < info->num_clks; clk_num++) {
1787                 if (!(clk_sel & (1 << clk_num)))
1788                         continue;
1789
1790                 sprintf(clk_name, "clk_uart_baud%d", clk_num);
1791                 clk = clk_get(dev, clk_name);
1792                 if (IS_ERR(clk))
1793                         continue;
1794
1795                 ret = clk_prepare_enable(clk);
1796                 if (ret) {
1797                         clk_put(clk);
1798                         continue;
1799                 }
1800
1801                 ourport->baudclk = clk;
1802                 ourport->baudclk_rate = clk_get_rate(clk);
1803                 s3c24xx_serial_setsource(&ourport->port, clk_num);
1804
1805                 return 0;
1806         }
1807
1808         return -EINVAL;
1809 }
1810
1811 /* s3c24xx_serial_init_port
1812  *
1813  * initialise a single serial port from the platform device given
1814  */
1815
1816 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1817                                     struct platform_device *platdev)
1818 {
1819         struct uart_port *port = &ourport->port;
1820         const struct s3c2410_uartcfg *cfg = ourport->cfg;
1821         struct resource *res;
1822         int ret;
1823
1824         if (platdev == NULL)
1825                 return -ENODEV;
1826
1827         if (port->mapbase != 0)
1828                 return -EINVAL;
1829
1830         /* setup info for port */
1831         port->dev       = &platdev->dev;
1832
1833         port->uartclk = 1;
1834
1835         if (cfg->uart_flags & UPF_CONS_FLOW) {
1836                 dev_dbg(port->dev, "enabling flow control\n");
1837                 port->flags |= UPF_CONS_FLOW;
1838         }
1839
1840         /* sort our the physical and virtual addresses for each UART */
1841
1842         res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1843         if (res == NULL) {
1844                 dev_err(port->dev, "failed to find memory resource for uart\n");
1845                 return -EINVAL;
1846         }
1847
1848         dev_dbg(port->dev, "resource %pR)\n", res);
1849
1850         port->membase = devm_ioremap_resource(port->dev, res);
1851         if (IS_ERR(port->membase)) {
1852                 dev_err(port->dev, "failed to remap controller address\n");
1853                 return -EBUSY;
1854         }
1855
1856         port->mapbase = res->start;
1857         ret = platform_get_irq(platdev, 0);
1858         if (ret < 0) {
1859                 port->irq = 0;
1860         } else {
1861                 port->irq = ret;
1862                 ourport->rx_irq = ret;
1863                 ourport->tx_irq = ret + 1;
1864         }
1865
1866         /*
1867          * DMA is currently supported only on DT platforms, if DMA properties
1868          * are specified.
1869          */
1870         if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1871                                                      "dmas", NULL)) {
1872                 ourport->dma = devm_kzalloc(port->dev,
1873                                             sizeof(*ourport->dma),
1874                                             GFP_KERNEL);
1875                 if (!ourport->dma) {
1876                         ret = -ENOMEM;
1877                         goto err;
1878                 }
1879         }
1880
1881         ourport->clk    = clk_get(&platdev->dev, "uart");
1882         if (IS_ERR(ourport->clk)) {
1883                 pr_err("%s: Controller clock not found\n",
1884                                 dev_name(&platdev->dev));
1885                 ret = PTR_ERR(ourport->clk);
1886                 goto err;
1887         }
1888
1889         ret = clk_prepare_enable(ourport->clk);
1890         if (ret) {
1891                 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1892                 clk_put(ourport->clk);
1893                 goto err;
1894         }
1895
1896         ret = s3c24xx_serial_enable_baudclk(ourport);
1897         if (ret)
1898                 pr_warn("uart: failed to enable baudclk\n");
1899
1900         /* Keep all interrupts masked and cleared */
1901         switch (ourport->info->type) {
1902         case TYPE_S3C6400:
1903                 wr_regl(port, S3C64XX_UINTM, 0xf);
1904                 wr_regl(port, S3C64XX_UINTP, 0xf);
1905                 wr_regl(port, S3C64XX_UINTSP, 0xf);
1906                 break;
1907         case TYPE_APPLE_S5L: {
1908                 u32 ucon;
1909
1910                 ucon = rd_regl(port, S3C2410_UCON);
1911                 ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
1912                         APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
1913                         APPLE_S5L_UCON_RXTO_ENA_MSK);
1914                 wr_regl(port, S3C2410_UCON, ucon);
1915
1916                 wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
1917                 break;
1918         }
1919         default:
1920                 break;
1921         }
1922
1923         dev_dbg(port->dev, "port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1924                 &port->mapbase, port->membase, port->irq,
1925                 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1926
1927         /* reset the fifos (and setup the uart) */
1928         s3c24xx_serial_resetport(port, cfg);
1929
1930         return 0;
1931
1932 err:
1933         port->mapbase = 0;
1934         return ret;
1935 }
1936
1937 /* Device driver serial port probe */
1938
1939 static int probe_index;
1940
1941 static inline const struct s3c24xx_serial_drv_data *
1942 s3c24xx_get_driver_data(struct platform_device *pdev)
1943 {
1944         if (dev_of_node(&pdev->dev))
1945                 return of_device_get_match_data(&pdev->dev);
1946
1947         return (struct s3c24xx_serial_drv_data *)
1948                         platform_get_device_id(pdev)->driver_data;
1949 }
1950
1951 static int s3c24xx_serial_probe(struct platform_device *pdev)
1952 {
1953         struct device_node *np = pdev->dev.of_node;
1954         struct s3c24xx_uart_port *ourport;
1955         int index = probe_index;
1956         int ret, prop = 0, fifosize_prop = 1;
1957
1958         if (np) {
1959                 ret = of_alias_get_id(np, "serial");
1960                 if (ret >= 0)
1961                         index = ret;
1962         }
1963
1964         if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) {
1965                 dev_err(&pdev->dev, "serial%d out of range\n", index);
1966                 return -EINVAL;
1967         }
1968         ourport = &s3c24xx_serial_ports[index];
1969
1970         s3c24xx_serial_init_port_default(index);
1971
1972         ourport->drv_data = s3c24xx_get_driver_data(pdev);
1973         if (!ourport->drv_data) {
1974                 dev_err(&pdev->dev, "could not find driver data\n");
1975                 return -ENODEV;
1976         }
1977
1978         ourport->baudclk = ERR_PTR(-EINVAL);
1979         ourport->info = &ourport->drv_data->info;
1980         ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1981                         dev_get_platdata(&pdev->dev) :
1982                         &ourport->drv_data->def_cfg;
1983
1984         switch (ourport->info->type) {
1985         case TYPE_S3C6400:
1986                 ourport->port.ops = &s3c64xx_serial_ops;
1987                 break;
1988         case TYPE_APPLE_S5L:
1989                 ourport->port.ops = &apple_s5l_serial_ops;
1990                 break;
1991         }
1992
1993         ourport->port.iotype = ourport->info->iotype;
1994
1995         if (np) {
1996                 fifosize_prop = of_property_read_u32(np, "samsung,uart-fifosize",
1997                                 &ourport->port.fifosize);
1998
1999                 if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
2000                         switch (prop) {
2001                         case 1:
2002                                 ourport->port.iotype = UPIO_MEM;
2003                                 break;
2004                         case 4:
2005                                 ourport->port.iotype = UPIO_MEM32;
2006                                 break;
2007                         default:
2008                                 dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n",
2009                                                 prop);
2010                                 return -EINVAL;
2011                         }
2012                 }
2013         }
2014
2015         if (fifosize_prop) {
2016                 if (ourport->drv_data->fifosize[index])
2017                         ourport->port.fifosize = ourport->drv_data->fifosize[index];
2018                 else if (ourport->info->fifosize)
2019                         ourport->port.fifosize = ourport->info->fifosize;
2020         }
2021
2022         ourport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SAMSUNG_CONSOLE);
2023
2024         /*
2025          * DMA transfers must be aligned at least to cache line size,
2026          * so find minimal transfer size suitable for DMA mode
2027          */
2028         ourport->min_dma_size = max_t(int, ourport->port.fifosize,
2029                                     dma_get_cache_alignment());
2030
2031         dev_dbg(&pdev->dev, "%s: initialising port %p...\n", __func__, ourport);
2032
2033         ret = s3c24xx_serial_init_port(ourport, pdev);
2034         if (ret < 0)
2035                 return ret;
2036
2037         if (!s3c24xx_uart_drv.state) {
2038                 ret = uart_register_driver(&s3c24xx_uart_drv);
2039                 if (ret < 0) {
2040                         pr_err("Failed to register Samsung UART driver\n");
2041                         return ret;
2042                 }
2043         }
2044
2045         dev_dbg(&pdev->dev, "%s: adding port\n", __func__);
2046         uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
2047         platform_set_drvdata(pdev, &ourport->port);
2048
2049         /*
2050          * Deactivate the clock enabled in s3c24xx_serial_init_port here,
2051          * so that a potential re-enablement through the pm-callback overlaps
2052          * and keeps the clock enabled in this case.
2053          */
2054         clk_disable_unprepare(ourport->clk);
2055         if (!IS_ERR(ourport->baudclk))
2056                 clk_disable_unprepare(ourport->baudclk);
2057
2058         probe_index++;
2059
2060         return 0;
2061 }
2062
2063 static void s3c24xx_serial_remove(struct platform_device *dev)
2064 {
2065         struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
2066
2067         if (port)
2068                 uart_remove_one_port(&s3c24xx_uart_drv, port);
2069
2070         uart_unregister_driver(&s3c24xx_uart_drv);
2071 }
2072
2073 /* UART power management code */
2074 #ifdef CONFIG_PM_SLEEP
2075 static int s3c24xx_serial_suspend(struct device *dev)
2076 {
2077         struct uart_port *port = s3c24xx_dev_to_port(dev);
2078
2079         if (port)
2080                 uart_suspend_port(&s3c24xx_uart_drv, port);
2081
2082         return 0;
2083 }
2084
2085 static int s3c24xx_serial_resume(struct device *dev)
2086 {
2087         struct uart_port *port = s3c24xx_dev_to_port(dev);
2088         struct s3c24xx_uart_port *ourport = to_ourport(port);
2089
2090         if (port) {
2091                 clk_prepare_enable(ourport->clk);
2092                 if (!IS_ERR(ourport->baudclk))
2093                         clk_prepare_enable(ourport->baudclk);
2094                 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
2095                 if (!IS_ERR(ourport->baudclk))
2096                         clk_disable_unprepare(ourport->baudclk);
2097                 clk_disable_unprepare(ourport->clk);
2098
2099                 uart_resume_port(&s3c24xx_uart_drv, port);
2100         }
2101
2102         return 0;
2103 }
2104
2105 static int s3c24xx_serial_resume_noirq(struct device *dev)
2106 {
2107         struct uart_port *port = s3c24xx_dev_to_port(dev);
2108         struct s3c24xx_uart_port *ourport = to_ourport(port);
2109
2110         if (port) {
2111                 /* restore IRQ mask */
2112                 switch (ourport->info->type) {
2113                 case TYPE_S3C6400: {
2114                         u32 uintm = 0xf;
2115
2116                         if (ourport->tx_enabled)
2117                                 uintm &= ~S3C64XX_UINTM_TXD_MSK;
2118                         if (ourport->rx_enabled)
2119                                 uintm &= ~S3C64XX_UINTM_RXD_MSK;
2120                         clk_prepare_enable(ourport->clk);
2121                         if (!IS_ERR(ourport->baudclk))
2122                                 clk_prepare_enable(ourport->baudclk);
2123                         wr_regl(port, S3C64XX_UINTM, uintm);
2124                         if (!IS_ERR(ourport->baudclk))
2125                                 clk_disable_unprepare(ourport->baudclk);
2126                         clk_disable_unprepare(ourport->clk);
2127                         break;
2128                 }
2129                 case TYPE_APPLE_S5L: {
2130                         u32 ucon;
2131                         int ret;
2132
2133                         ret = clk_prepare_enable(ourport->clk);
2134                         if (ret) {
2135                                 dev_err(dev, "clk_enable clk failed: %d\n", ret);
2136                                 return ret;
2137                         }
2138                         if (!IS_ERR(ourport->baudclk)) {
2139                                 ret = clk_prepare_enable(ourport->baudclk);
2140                                 if (ret) {
2141                                         dev_err(dev, "clk_enable baudclk failed: %d\n", ret);
2142                                         clk_disable_unprepare(ourport->clk);
2143                                         return ret;
2144                                 }
2145                         }
2146
2147                         ucon = rd_regl(port, S3C2410_UCON);
2148
2149                         ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
2150                                   APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
2151                                   APPLE_S5L_UCON_RXTO_ENA_MSK);
2152
2153                         if (ourport->tx_enabled)
2154                                 ucon |= APPLE_S5L_UCON_TXTHRESH_ENA_MSK;
2155                         if (ourport->rx_enabled)
2156                                 ucon |= APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
2157                                         APPLE_S5L_UCON_RXTO_ENA_MSK;
2158
2159                         wr_regl(port, S3C2410_UCON, ucon);
2160
2161                         if (!IS_ERR(ourport->baudclk))
2162                                 clk_disable_unprepare(ourport->baudclk);
2163                         clk_disable_unprepare(ourport->clk);
2164                         break;
2165                 }
2166                 default:
2167                         break;
2168                 }
2169         }
2170
2171         return 0;
2172 }
2173
2174 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
2175         SET_SYSTEM_SLEEP_PM_OPS(s3c24xx_serial_suspend, s3c24xx_serial_resume)
2176         SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, s3c24xx_serial_resume_noirq)
2177 };
2178 #define SERIAL_SAMSUNG_PM_OPS   (&s3c24xx_serial_pm_ops)
2179
2180 #else /* !CONFIG_PM_SLEEP */
2181
2182 #define SERIAL_SAMSUNG_PM_OPS   NULL
2183 #endif /* CONFIG_PM_SLEEP */
2184
2185 /* Console code */
2186
2187 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2188
2189 static struct uart_port *cons_uart;
2190
2191 static bool
2192 s3c24xx_serial_console_txrdy(struct uart_port *port, u32 ufcon)
2193 {
2194         const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
2195         u32 ufstat, utrstat;
2196
2197         if (ufcon & S3C2410_UFCON_FIFOMODE) {
2198                 /* fifo mode - check amount of data in fifo registers... */
2199
2200                 ufstat = rd_regl(port, S3C2410_UFSTAT);
2201                 return !(ufstat & info->tx_fifofull);
2202         }
2203
2204         /* in non-fifo mode, we go and use the tx buffer empty */
2205
2206         utrstat = rd_regl(port, S3C2410_UTRSTAT);
2207         return utrstat & S3C2410_UTRSTAT_TXE;
2208 }
2209
2210 static bool
2211 s3c24xx_port_configured(u32 ucon)
2212 {
2213         /* consider the serial port configured if the tx/rx mode set */
2214         return (ucon & 0xf) != 0;
2215 }
2216
2217 #ifdef CONFIG_CONSOLE_POLL
2218 /*
2219  * Console polling routines for writing and reading from the uart while
2220  * in an interrupt or debug context.
2221  */
2222
2223 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
2224 {
2225         const struct s3c24xx_uart_port *ourport = to_ourport(port);
2226         u32 ufstat;
2227
2228         ufstat = rd_regl(port, S3C2410_UFSTAT);
2229         if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
2230                 return NO_POLL_CHAR;
2231
2232         return rd_reg(port, S3C2410_URXH);
2233 }
2234
2235 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
2236                 unsigned char c)
2237 {
2238         u32 ufcon = rd_regl(port, S3C2410_UFCON);
2239         u32 ucon = rd_regl(port, S3C2410_UCON);
2240
2241         /* not possible to xmit on unconfigured port */
2242         if (!s3c24xx_port_configured(ucon))
2243                 return;
2244
2245         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2246                 cpu_relax();
2247         wr_reg(port, S3C2410_UTXH, c);
2248 }
2249
2250 #endif /* CONFIG_CONSOLE_POLL */
2251
2252 static void
2253 s3c24xx_serial_console_putchar(struct uart_port *port, unsigned char ch)
2254 {
2255         u32 ufcon = rd_regl(port, S3C2410_UFCON);
2256
2257         while (!s3c24xx_serial_console_txrdy(port, ufcon))
2258                 cpu_relax();
2259         wr_reg(port, S3C2410_UTXH, ch);
2260 }
2261
2262 static void
2263 s3c24xx_serial_console_write(struct console *co, const char *s,
2264                              unsigned int count)
2265 {
2266         u32 ucon = rd_regl(cons_uart, S3C2410_UCON);
2267         unsigned long flags;
2268         bool locked = true;
2269
2270         /* not possible to xmit on unconfigured port */
2271         if (!s3c24xx_port_configured(ucon))
2272                 return;
2273
2274         if (cons_uart->sysrq)
2275                 locked = false;
2276         else if (oops_in_progress)
2277                 locked = uart_port_trylock_irqsave(cons_uart, &flags);
2278         else
2279                 uart_port_lock_irqsave(cons_uart, &flags);
2280
2281         uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2282
2283         if (locked)
2284                 uart_port_unlock_irqrestore(cons_uart, flags);
2285 }
2286
2287 /* Shouldn't be __init, as it can be instantiated from other module */
2288 static void
2289 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2290                            int *parity, int *bits)
2291 {
2292         struct clk *clk;
2293         unsigned long rate;
2294         u32 ulcon, ucon, ubrdiv;
2295         char clk_name[MAX_CLK_NAME_LENGTH];
2296         u8 clk_sel;
2297
2298         ulcon  = rd_regl(port, S3C2410_ULCON);
2299         ucon   = rd_regl(port, S3C2410_UCON);
2300         ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2301
2302         if (s3c24xx_port_configured(ucon)) {
2303                 switch (ulcon & S3C2410_LCON_CSMASK) {
2304                 case S3C2410_LCON_CS5:
2305                         *bits = 5;
2306                         break;
2307                 case S3C2410_LCON_CS6:
2308                         *bits = 6;
2309                         break;
2310                 case S3C2410_LCON_CS7:
2311                         *bits = 7;
2312                         break;
2313                 case S3C2410_LCON_CS8:
2314                 default:
2315                         *bits = 8;
2316                         break;
2317                 }
2318
2319                 switch (ulcon & S3C2410_LCON_PMASK) {
2320                 case S3C2410_LCON_PEVEN:
2321                         *parity = 'e';
2322                         break;
2323
2324                 case S3C2410_LCON_PODD:
2325                         *parity = 'o';
2326                         break;
2327
2328                 case S3C2410_LCON_PNONE:
2329                 default:
2330                         *parity = 'n';
2331                 }
2332
2333                 /* now calculate the baud rate */
2334
2335                 clk_sel = s3c24xx_serial_getsource(port);
2336                 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2337
2338                 clk = clk_get(port->dev, clk_name);
2339                 if (!IS_ERR(clk))
2340                         rate = clk_get_rate(clk);
2341                 else
2342                         rate = 1;
2343
2344                 *baud = rate / (16 * (ubrdiv + 1));
2345                 dev_dbg(port->dev, "calculated baud %d\n", *baud);
2346         }
2347 }
2348
2349 /* Shouldn't be __init, as it can be instantiated from other module */
2350 static int
2351 s3c24xx_serial_console_setup(struct console *co, char *options)
2352 {
2353         struct uart_port *port;
2354         int baud = 9600;
2355         int bits = 8;
2356         int parity = 'n';
2357         int flow = 'n';
2358
2359         /* is this a valid port */
2360
2361         if (co->index == -1 || co->index >= UART_NR)
2362                 co->index = 0;
2363
2364         port = &s3c24xx_serial_ports[co->index].port;
2365
2366         /* is the port configured? */
2367
2368         if (port->mapbase == 0x0)
2369                 return -ENODEV;
2370
2371         cons_uart = port;
2372
2373         /*
2374          * Check whether an invalid uart number has been specified, and
2375          * if so, search for the first available port that does have
2376          * console support.
2377          */
2378         if (options)
2379                 uart_parse_options(options, &baud, &parity, &bits, &flow);
2380         else
2381                 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2382
2383         dev_dbg(port->dev, "baud %d\n", baud);
2384
2385         return uart_set_options(port, co, baud, parity, bits, flow);
2386 }
2387
2388 static struct console s3c24xx_serial_console = {
2389         .name           = S3C24XX_SERIAL_NAME,
2390         .device         = uart_console_device,
2391         .flags          = CON_PRINTBUFFER,
2392         .index          = -1,
2393         .write          = s3c24xx_serial_console_write,
2394         .setup          = s3c24xx_serial_console_setup,
2395         .data           = &s3c24xx_uart_drv,
2396 };
2397 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2398
2399 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2400 static const struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2401         .info = {
2402                 .name           = "Samsung S3C6400 UART",
2403                 .type           = TYPE_S3C6400,
2404                 .port_type      = PORT_S3C6400,
2405                 .iotype         = UPIO_MEM,
2406                 .fifosize       = 64,
2407                 .has_divslot    = true,
2408                 .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
2409                 .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
2410                 .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
2411                 .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
2412                 .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
2413                 .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
2414                 .def_clk_sel    = S3C2410_UCON_CLKSEL2,
2415                 .num_clks       = 4,
2416                 .clksel_mask    = S3C6400_UCON_CLKMASK,
2417                 .clksel_shift   = S3C6400_UCON_CLKSHIFT,
2418         },
2419         .def_cfg = {
2420                 .ucon           = S3C2410_UCON_DEFAULT,
2421                 .ufcon          = S3C2410_UFCON_DEFAULT,
2422         },
2423 };
2424 #define S3C6400_SERIAL_DRV_DATA (&s3c6400_serial_drv_data)
2425 #else
2426 #define S3C6400_SERIAL_DRV_DATA NULL
2427 #endif
2428
2429 #ifdef CONFIG_CPU_S5PV210
2430 static const struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2431         .info = {
2432                 .name           = "Samsung S5PV210 UART",
2433                 .type           = TYPE_S3C6400,
2434                 .port_type      = PORT_S3C6400,
2435                 .iotype         = UPIO_MEM,
2436                 .has_divslot    = true,
2437                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,
2438                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,
2439                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,
2440                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,
2441                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,
2442                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,
2443                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2444                 .num_clks       = 2,
2445                 .clksel_mask    = S5PV210_UCON_CLKMASK,
2446                 .clksel_shift   = S5PV210_UCON_CLKSHIFT,
2447         },
2448         .def_cfg = {
2449                 .ucon           = S5PV210_UCON_DEFAULT,
2450                 .ufcon          = S5PV210_UFCON_DEFAULT,
2451         },
2452         .fifosize = { 256, 64, 16, 16 },
2453 };
2454 #define S5PV210_SERIAL_DRV_DATA (&s5pv210_serial_drv_data)
2455 #else
2456 #define S5PV210_SERIAL_DRV_DATA NULL
2457 #endif
2458
2459 #if defined(CONFIG_ARCH_EXYNOS)
2460 #define EXYNOS_COMMON_SERIAL_DRV_DATA                           \
2461         .info = {                                               \
2462                 .name           = "Samsung Exynos UART",        \
2463                 .type           = TYPE_S3C6400,                 \
2464                 .port_type      = PORT_S3C6400,                 \
2465                 .iotype         = UPIO_MEM,                     \
2466                 .has_divslot    = true,                         \
2467                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
2468                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
2469                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
2470                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
2471                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
2472                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
2473                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,         \
2474                 .num_clks       = 1,                            \
2475                 .clksel_mask    = 0,                            \
2476                 .clksel_shift   = 0,                            \
2477         },                                                      \
2478         .def_cfg = {                                            \
2479                 .ucon           = S5PV210_UCON_DEFAULT,         \
2480                 .ufcon          = S5PV210_UFCON_DEFAULT,        \
2481                 .has_fracval    = 1,                            \
2482         }                                                       \
2483
2484 static const struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2485         EXYNOS_COMMON_SERIAL_DRV_DATA,
2486         .fifosize = { 256, 64, 16, 16 },
2487 };
2488
2489 static const struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2490         EXYNOS_COMMON_SERIAL_DRV_DATA,
2491         .fifosize = { 64, 256, 16, 256 },
2492 };
2493
2494 static const struct s3c24xx_serial_drv_data exynos850_serial_drv_data = {
2495         EXYNOS_COMMON_SERIAL_DRV_DATA,
2496         .fifosize = { 256, 64, 64, 64 },
2497 };
2498
2499 static const struct s3c24xx_serial_drv_data gs101_serial_drv_data = {
2500         .info = {
2501                 .name           = "Google GS101 UART",
2502                 .type           = TYPE_S3C6400,
2503                 .port_type      = PORT_S3C6400,
2504                 .iotype         = UPIO_MEM32,
2505                 .has_divslot    = true,
2506                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,
2507                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,
2508                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,
2509                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,
2510                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,
2511                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,
2512                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2513                 .num_clks       = 1,
2514                 .clksel_mask    = 0,
2515                 .clksel_shift   = 0,
2516         },
2517         .def_cfg = {
2518                 .ucon           = S5PV210_UCON_DEFAULT,
2519                 .ufcon          = S5PV210_UFCON_DEFAULT,
2520                 .has_fracval    = 1,
2521         },
2522         /* samsung,uart-fifosize must be specified in the device tree. */
2523         .fifosize = { 0 },
2524 };
2525
2526 #define EXYNOS4210_SERIAL_DRV_DATA (&exynos4210_serial_drv_data)
2527 #define EXYNOS5433_SERIAL_DRV_DATA (&exynos5433_serial_drv_data)
2528 #define EXYNOS850_SERIAL_DRV_DATA (&exynos850_serial_drv_data)
2529 #define GS101_SERIAL_DRV_DATA (&gs101_serial_drv_data)
2530
2531 #else
2532 #define EXYNOS4210_SERIAL_DRV_DATA NULL
2533 #define EXYNOS5433_SERIAL_DRV_DATA NULL
2534 #define EXYNOS850_SERIAL_DRV_DATA NULL
2535 #define GS101_SERIAL_DRV_DATA NULL
2536 #endif
2537
2538 #ifdef CONFIG_ARCH_APPLE
2539 static const struct s3c24xx_serial_drv_data s5l_serial_drv_data = {
2540         .info = {
2541                 .name           = "Apple S5L UART",
2542                 .type           = TYPE_APPLE_S5L,
2543                 .port_type      = PORT_8250,
2544                 .iotype         = UPIO_MEM,
2545                 .fifosize       = 16,
2546                 .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
2547                 .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
2548                 .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
2549                 .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
2550                 .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
2551                 .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
2552                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2553                 .num_clks       = 1,
2554                 .clksel_mask    = 0,
2555                 .clksel_shift   = 0,
2556                 .ucon_mask      = APPLE_S5L_UCON_MASK,
2557         },
2558         .def_cfg = {
2559                 .ucon           = APPLE_S5L_UCON_DEFAULT,
2560                 .ufcon          = S3C2410_UFCON_DEFAULT,
2561         },
2562 };
2563 #define S5L_SERIAL_DRV_DATA (&s5l_serial_drv_data)
2564 #else
2565 #define S5L_SERIAL_DRV_DATA NULL
2566 #endif
2567
2568 #if defined(CONFIG_ARCH_ARTPEC)
2569 static const struct s3c24xx_serial_drv_data artpec8_serial_drv_data = {
2570         .info = {
2571                 .name           = "Axis ARTPEC-8 UART",
2572                 .type           = TYPE_S3C6400,
2573                 .port_type      = PORT_S3C6400,
2574                 .iotype         = UPIO_MEM,
2575                 .fifosize       = 64,
2576                 .has_divslot    = true,
2577                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,
2578                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,
2579                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,
2580                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,
2581                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,
2582                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,
2583                 .def_clk_sel    = S3C2410_UCON_CLKSEL0,
2584                 .num_clks       = 1,
2585                 .clksel_mask    = 0,
2586                 .clksel_shift   = 0,
2587         },
2588         .def_cfg = {
2589                 .ucon           = S5PV210_UCON_DEFAULT,
2590                 .ufcon          = S5PV210_UFCON_DEFAULT,
2591                 .has_fracval    = 1,
2592         }
2593 };
2594 #define ARTPEC8_SERIAL_DRV_DATA (&artpec8_serial_drv_data)
2595 #else
2596 #define ARTPEC8_SERIAL_DRV_DATA (NULL)
2597 #endif
2598
2599 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
2600         {
2601                 .name           = "s3c6400-uart",
2602                 .driver_data    = (kernel_ulong_t)S3C6400_SERIAL_DRV_DATA,
2603         }, {
2604                 .name           = "s5pv210-uart",
2605                 .driver_data    = (kernel_ulong_t)S5PV210_SERIAL_DRV_DATA,
2606         }, {
2607                 .name           = "exynos4210-uart",
2608                 .driver_data    = (kernel_ulong_t)EXYNOS4210_SERIAL_DRV_DATA,
2609         }, {
2610                 .name           = "exynos5433-uart",
2611                 .driver_data    = (kernel_ulong_t)EXYNOS5433_SERIAL_DRV_DATA,
2612         }, {
2613                 .name           = "s5l-uart",
2614                 .driver_data    = (kernel_ulong_t)S5L_SERIAL_DRV_DATA,
2615         }, {
2616                 .name           = "exynos850-uart",
2617                 .driver_data    = (kernel_ulong_t)EXYNOS850_SERIAL_DRV_DATA,
2618         }, {
2619                 .name           = "artpec8-uart",
2620                 .driver_data    = (kernel_ulong_t)ARTPEC8_SERIAL_DRV_DATA,
2621         }, {
2622                 .name           = "gs101-uart",
2623                 .driver_data    = (kernel_ulong_t)GS101_SERIAL_DRV_DATA,
2624         },
2625         { },
2626 };
2627 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2628
2629 #ifdef CONFIG_OF
2630 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2631         { .compatible = "samsung,s3c6400-uart",
2632                 .data = S3C6400_SERIAL_DRV_DATA },
2633         { .compatible = "samsung,s5pv210-uart",
2634                 .data = S5PV210_SERIAL_DRV_DATA },
2635         { .compatible = "samsung,exynos4210-uart",
2636                 .data = EXYNOS4210_SERIAL_DRV_DATA },
2637         { .compatible = "samsung,exynos5433-uart",
2638                 .data = EXYNOS5433_SERIAL_DRV_DATA },
2639         { .compatible = "apple,s5l-uart",
2640                 .data = S5L_SERIAL_DRV_DATA },
2641         { .compatible = "samsung,exynos850-uart",
2642                 .data = EXYNOS850_SERIAL_DRV_DATA },
2643         { .compatible = "axis,artpec8-uart",
2644                 .data = ARTPEC8_SERIAL_DRV_DATA },
2645         { .compatible = "google,gs101-uart",
2646                 .data = GS101_SERIAL_DRV_DATA },
2647         {},
2648 };
2649 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2650 #endif
2651
2652 static struct platform_driver samsung_serial_driver = {
2653         .probe          = s3c24xx_serial_probe,
2654         .remove_new     = s3c24xx_serial_remove,
2655         .id_table       = s3c24xx_serial_driver_ids,
2656         .driver         = {
2657                 .name   = "samsung-uart",
2658                 .pm     = SERIAL_SAMSUNG_PM_OPS,
2659                 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2660         },
2661 };
2662
2663 static int __init samsung_serial_init(void)
2664 {
2665         int ret;
2666
2667         s3c24xx_serial_register_console();
2668
2669         ret = platform_driver_register(&samsung_serial_driver);
2670         if (ret) {
2671                 s3c24xx_serial_unregister_console();
2672                 return ret;
2673         }
2674
2675         return 0;
2676 }
2677
2678 static void __exit samsung_serial_exit(void)
2679 {
2680         platform_driver_unregister(&samsung_serial_driver);
2681         s3c24xx_serial_unregister_console();
2682 }
2683
2684 module_init(samsung_serial_init);
2685 module_exit(samsung_serial_exit);
2686
2687 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2688 /*
2689  * Early console.
2690  */
2691
2692 static void wr_reg_barrier(const struct uart_port *port, u32 reg, u32 val)
2693 {
2694         switch (port->iotype) {
2695         case UPIO_MEM:
2696                 writeb(val, portaddr(port, reg));
2697                 break;
2698         case UPIO_MEM32:
2699                 writel(val, portaddr(port, reg));
2700                 break;
2701         }
2702 }
2703
2704 struct samsung_early_console_data {
2705         u32 txfull_mask;
2706         u32 rxfifo_mask;
2707 };
2708
2709 static void samsung_early_busyuart(const struct uart_port *port)
2710 {
2711         while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2712                 ;
2713 }
2714
2715 static void samsung_early_busyuart_fifo(const struct uart_port *port)
2716 {
2717         const struct samsung_early_console_data *data = port->private_data;
2718
2719         while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2720                 ;
2721 }
2722
2723 static void samsung_early_putc(struct uart_port *port, unsigned char c)
2724 {
2725         if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2726                 samsung_early_busyuart_fifo(port);
2727         else
2728                 samsung_early_busyuart(port);
2729
2730         wr_reg_barrier(port, S3C2410_UTXH, c);
2731 }
2732
2733 static void samsung_early_write(struct console *con, const char *s,
2734                                 unsigned int n)
2735 {
2736         struct earlycon_device *dev = con->data;
2737
2738         uart_console_write(&dev->port, s, n, samsung_early_putc);
2739 }
2740
2741 static int samsung_early_read(struct console *con, char *s, unsigned int n)
2742 {
2743         struct earlycon_device *dev = con->data;
2744         const struct samsung_early_console_data *data = dev->port.private_data;
2745         int num_read = 0;
2746         u32 ch, ufstat;
2747
2748         while (num_read < n) {
2749                 ufstat = rd_regl(&dev->port, S3C2410_UFSTAT);
2750                 if (!(ufstat & data->rxfifo_mask))
2751                         break;
2752                 ch = rd_reg(&dev->port, S3C2410_URXH);
2753                 if (ch == NO_POLL_CHAR)
2754                         break;
2755
2756                 s[num_read++] = ch;
2757         }
2758
2759         return num_read;
2760 }
2761
2762 static int __init samsung_early_console_setup(struct earlycon_device *device,
2763                                               const char *opt)
2764 {
2765         if (!device->port.membase)
2766                 return -ENODEV;
2767
2768         device->con->write = samsung_early_write;
2769         device->con->read = samsung_early_read;
2770         return 0;
2771 }
2772
2773 /* S3C2410 */
2774 static struct samsung_early_console_data s3c2410_early_console_data = {
2775         .txfull_mask = S3C2410_UFSTAT_TXFULL,
2776         .rxfifo_mask = S3C2410_UFSTAT_RXFULL | S3C2410_UFSTAT_RXMASK,
2777 };
2778
2779 /* S3C64xx */
2780 static struct samsung_early_console_data s3c2440_early_console_data = {
2781         .txfull_mask = S3C2440_UFSTAT_TXFULL,
2782         .rxfifo_mask = S3C2440_UFSTAT_RXFULL | S3C2440_UFSTAT_RXMASK,
2783 };
2784
2785 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2786                                               const char *opt)
2787 {
2788         device->port.private_data = &s3c2440_early_console_data;
2789         return samsung_early_console_setup(device, opt);
2790 }
2791
2792 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2793                         s3c2440_early_console_setup);
2794
2795 /* S5PV210, Exynos */
2796 static struct samsung_early_console_data s5pv210_early_console_data = {
2797         .txfull_mask = S5PV210_UFSTAT_TXFULL,
2798         .rxfifo_mask = S5PV210_UFSTAT_RXFULL | S5PV210_UFSTAT_RXMASK,
2799 };
2800
2801 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2802                                               const char *opt)
2803 {
2804         device->port.private_data = &s5pv210_early_console_data;
2805         return samsung_early_console_setup(device, opt);
2806 }
2807
2808 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2809                         s5pv210_early_console_setup);
2810 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2811                         s5pv210_early_console_setup);
2812 OF_EARLYCON_DECLARE(artpec8, "axis,artpec8-uart",
2813                         s5pv210_early_console_setup);
2814
2815 static int __init gs101_early_console_setup(struct earlycon_device *device,
2816                                             const char *opt)
2817 {
2818         /* gs101 always expects MMIO32 register accesses. */
2819         device->port.iotype = UPIO_MEM32;
2820
2821         return s5pv210_early_console_setup(device, opt);
2822 }
2823
2824 OF_EARLYCON_DECLARE(gs101, "google,gs101-uart", gs101_early_console_setup);
2825
2826 /* Apple S5L */
2827 static int __init apple_s5l_early_console_setup(struct earlycon_device *device,
2828                                                 const char *opt)
2829 {
2830         /* Close enough to S3C2410 for earlycon... */
2831         device->port.private_data = &s3c2410_early_console_data;
2832
2833 #ifdef CONFIG_ARM64
2834         /* ... but we need to override the existing fixmap entry as nGnRnE */
2835         __set_fixmap(FIX_EARLYCON_MEM_BASE, device->port.mapbase,
2836                      __pgprot(PROT_DEVICE_nGnRnE));
2837 #endif
2838         return samsung_early_console_setup(device, opt);
2839 }
2840
2841 OF_EARLYCON_DECLARE(s5l, "apple,s5l-uart", apple_s5l_early_console_setup);
2842 #endif
2843
2844 MODULE_ALIAS("platform:samsung-uart");
2845 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2846 MODULE_AUTHOR("Ben Dooks <[email protected]>");
2847 MODULE_LICENSE("GPL v2");