drivers/tty/serial/qcom_geni_serial.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2017-2018, The Linux foundation. All rights reserved.
   3
   4 #include <linux/clk.h>
   5 #include <linux/console.h>
   6 #include <linux/io.h>
   7 #include <linux/iopoll.h>
   8 #include <linux/irq.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/pm_opp.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/pm_wakeirq.h>
  16 #include <linux/qcom-geni-se.h>
  17 #include <linux/serial.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/slab.h>
  20 #include <linux/tty.h>
  21 #include <linux/tty_flip.h>
  22
  23 /* UART specific GENI registers */
  24 #define SE_UART_LOOPBACK_CFG            0x22c
  25 #define SE_UART_IO_MACRO_CTRL           0x240
  26 #define SE_UART_TX_TRANS_CFG            0x25c
  27 #define SE_UART_TX_WORD_LEN             0x268
  28 #define SE_UART_TX_STOP_BIT_LEN         0x26c
  29 #define SE_UART_TX_TRANS_LEN            0x270
  30 #define SE_UART_RX_TRANS_CFG            0x280
  31 #define SE_UART_RX_WORD_LEN             0x28c
  32 #define SE_UART_RX_STALE_CNT            0x294
  33 #define SE_UART_TX_PARITY_CFG           0x2a4
  34 #define SE_UART_RX_PARITY_CFG           0x2a8
  35 #define SE_UART_MANUAL_RFR              0x2ac
  36
  37 /* SE_UART_TRANS_CFG */
  38 #define UART_TX_PAR_EN          BIT(0)
  39 #define UART_CTS_MASK           BIT(1)
  40
  41 /* SE_UART_TX_WORD_LEN */
  42 #define TX_WORD_LEN_MSK         GENMASK(9, 0)
  43
  44 /* SE_UART_TX_STOP_BIT_LEN */
  45 #define TX_STOP_BIT_LEN_MSK     GENMASK(23, 0)
  46 #define TX_STOP_BIT_LEN_1       0
  47 #define TX_STOP_BIT_LEN_1_5     1
  48 #define TX_STOP_BIT_LEN_2       2
  49
  50 /* SE_UART_TX_TRANS_LEN */
  51 #define TX_TRANS_LEN_MSK        GENMASK(23, 0)
  52
  53 /* SE_UART_RX_TRANS_CFG */
  54 #define UART_RX_INS_STATUS_BIT  BIT(2)
  55 #define UART_RX_PAR_EN          BIT(3)
  56
  57 /* SE_UART_RX_WORD_LEN */
  58 #define RX_WORD_LEN_MASK        GENMASK(9, 0)
  59
  60 /* SE_UART_RX_STALE_CNT */
  61 #define RX_STALE_CNT            GENMASK(23, 0)
  62
  63 /* SE_UART_TX_PARITY_CFG/RX_PARITY_CFG */
  64 #define PAR_CALC_EN             BIT(0)
  65 #define PAR_MODE_MSK            GENMASK(2, 1)
  66 #define PAR_MODE_SHFT           1
  67 #define PAR_EVEN                0x00
  68 #define PAR_ODD                 0x01
  69 #define PAR_SPACE               0x10
  70 #define PAR_MARK                0x11
  71
  72 /* SE_UART_MANUAL_RFR register fields */
  73 #define UART_MANUAL_RFR_EN      BIT(31)
  74 #define UART_RFR_NOT_READY      BIT(1)
  75 #define UART_RFR_READY          BIT(0)
  76
  77 /* UART M_CMD OP codes */
  78 #define UART_START_TX           0x1
  79 #define UART_START_BREAK        0x4
  80 #define UART_STOP_BREAK         0x5
  81 /* UART S_CMD OP codes */
  82 #define UART_START_READ         0x1
  83 #define UART_PARAM              0x1
  84
  85 #define UART_OVERSAMPLING       32
  86 #define STALE_TIMEOUT           16
  87 #define DEFAULT_BITS_PER_CHAR   10
  88 #define GENI_UART_CONS_PORTS    1
  89 #define GENI_UART_PORTS         3
  90 #define DEF_FIFO_DEPTH_WORDS    16
  91 #define DEF_TX_WM               2
  92 #define DEF_FIFO_WIDTH_BITS     32
  93 #define UART_RX_WM              2
  94
  95 /* SE_UART_LOOPBACK_CFG */
  96 #define RX_TX_SORTED    BIT(0)
  97 #define CTS_RTS_SORTED  BIT(1)
  98 #define RX_TX_CTS_RTS_SORTED    (RX_TX_SORTED | CTS_RTS_SORTED)
  99
 100 /* UART pin swap value */
 101 #define DEFAULT_IO_MACRO_IO0_IO1_MASK           GENMASK(3, 0)
 102 #define IO_MACRO_IO0_SEL                0x3
 103 #define DEFAULT_IO_MACRO_IO2_IO3_MASK           GENMASK(15, 4)
 104 #define IO_MACRO_IO2_IO3_SWAP           0x4640
 105
 106 /* We always configure 4 bytes per FIFO word */
 107 #define BYTES_PER_FIFO_WORD             4
 108
 109 struct qcom_geni_private_data {
 110         /* NOTE: earlycon port will have NULL here */
 111         struct uart_driver *drv;
 112
 113         u32 poll_cached_bytes;
 114         unsigned int poll_cached_bytes_cnt;
 115
 116         u32 write_cached_bytes;
 117         unsigned int write_cached_bytes_cnt;
 118 };
 119
 120 struct qcom_geni_serial_port {
 121         struct uart_port uport;
 122         struct geni_se se;
 123         const char *name;
 124         u32 tx_fifo_depth;
 125         u32 tx_fifo_width;
 126         u32 rx_fifo_depth;
 127         bool setup;
 128         int (*handle_rx)(struct uart_port *uport, u32 bytes, bool drop);
 129         unsigned int baud;
 130         void *rx_fifo;
 131         u32 loopback;
 132         bool brk;
 133
 134         unsigned int tx_remaining;
 135         int wakeup_irq;
 136         bool rx_tx_swap;
 137         bool cts_rts_swap;
 138
 139         struct qcom_geni_private_data private_data;
 140 };
 141
 142 static const struct uart_ops qcom_geni_console_pops;
 143 static const struct uart_ops qcom_geni_uart_pops;
 144 static struct uart_driver qcom_geni_console_driver;
 145 static struct uart_driver qcom_geni_uart_driver;
 146 static int handle_rx_console(struct uart_port *uport, u32 bytes, bool drop);
 147 static int handle_rx_uart(struct uart_port *uport, u32 bytes, bool drop);
 148 static unsigned int qcom_geni_serial_tx_empty(struct uart_port *port);
 149 static void qcom_geni_serial_stop_rx(struct uart_port *uport);
 150 static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop);
 151
 152 static const unsigned long root_freq[] = {7372800, 14745600, 19200000, 29491200,
 153                                         32000000, 48000000, 51200000, 64000000,
 154                                         80000000, 96000000, 100000000,
 155                                         102400000, 112000000, 120000000,
 156                                         128000000};
 157
 158 #define to_dev_port(ptr, member) \
 159                 container_of(ptr, struct qcom_geni_serial_port, member)
 160
 161 static struct qcom_geni_serial_port qcom_geni_uart_ports[GENI_UART_PORTS] = {
 162         [0] = {
 163                 .uport = {
 164                                 .iotype = UPIO_MEM,
 165                                 .ops = &qcom_geni_uart_pops,
 166                                 .flags = UPF_BOOT_AUTOCONF,
 167                                 .line = 0,
 168                 },
 169         },
 170         [1] = {
 171                 .uport = {
 172                                 .iotype = UPIO_MEM,
 173                                 .ops = &qcom_geni_uart_pops,
 174                                 .flags = UPF_BOOT_AUTOCONF,
 175                                 .line = 1,
 176                 },
 177         },
 178         [2] = {
 179                 .uport = {
 180                                 .iotype = UPIO_MEM,
 181                                 .ops = &qcom_geni_uart_pops,
 182                                 .flags = UPF_BOOT_AUTOCONF,
 183                                 .line = 2,
 184                 },
 185         },
 186 };
 187
 188 static struct qcom_geni_serial_port qcom_geni_console_port = {
 189         .uport = {
 190                 .iotype = UPIO_MEM,
 191                 .ops = &qcom_geni_console_pops,
 192                 .flags = UPF_BOOT_AUTOCONF,
 193                 .line = 0,
 194         },
 195 };
 196
 197 static int qcom_geni_serial_request_port(struct uart_port *uport)
 198 {
 199         struct platform_device *pdev = to_platform_device(uport->dev);
 200         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 201
 202         uport->membase = devm_platform_ioremap_resource(pdev, 0);
 203         if (IS_ERR(uport->membase))
 204                 return PTR_ERR(uport->membase);
 205         port->se.base = uport->membase;
 206         return 0;
 207 }
 208
 209 static void qcom_geni_serial_config_port(struct uart_port *uport, int cfg_flags)
 210 {
 211         if (cfg_flags & UART_CONFIG_TYPE) {
 212                 uport->type = PORT_MSM;
 213                 qcom_geni_serial_request_port(uport);
 214         }
 215 }
 216
 217 static unsigned int qcom_geni_serial_get_mctrl(struct uart_port *uport)
 218 {
 219         unsigned int mctrl = TIOCM_DSR | TIOCM_CAR;
 220         u32 geni_ios;
 221
 222         if (uart_console(uport)) {
 223                 mctrl |= TIOCM_CTS;
 224         } else {
 225                 geni_ios = readl(uport->membase + SE_GENI_IOS);
 226                 if (!(geni_ios & IO2_DATA_IN))
 227                         mctrl |= TIOCM_CTS;
 228         }
 229
 230         return mctrl;
 231 }
 232
 233 static void qcom_geni_serial_set_mctrl(struct uart_port *uport,
 234                                                         unsigned int mctrl)
 235 {
 236         u32 uart_manual_rfr = 0;
 237         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 238
 239         if (uart_console(uport))
 240                 return;
 241
 242         if (mctrl & TIOCM_LOOP)
 243                 port->loopback = RX_TX_CTS_RTS_SORTED;
 244
 245         if (!(mctrl & TIOCM_RTS) && !uport->suspended)
 246                 uart_manual_rfr = UART_MANUAL_RFR_EN | UART_RFR_NOT_READY;
 247         writel(uart_manual_rfr, uport->membase + SE_UART_MANUAL_RFR);
 248 }
 249
 250 static const char *qcom_geni_serial_get_type(struct uart_port *uport)
 251 {
 252         return "MSM";
 253 }
 254
 255 static struct qcom_geni_serial_port *get_port_from_line(int line, bool console)
 256 {
 257         struct qcom_geni_serial_port *port;
 258         int nr_ports = console ? GENI_UART_CONS_PORTS : GENI_UART_PORTS;
 259
 260         if (line < 0 || line >= nr_ports)
 261                 return ERR_PTR(-ENXIO);
 262
 263         port = console ? &qcom_geni_console_port : &qcom_geni_uart_ports[line];
 264         return port;
 265 }
 266
 267 static bool qcom_geni_serial_poll_bit(struct uart_port *uport,
 268                                 int offset, int field, bool set)
 269 {
 270         u32 reg;
 271         struct qcom_geni_serial_port *port;
 272         unsigned int baud;
 273         unsigned int fifo_bits;
 274         unsigned long timeout_us = 20000;
 275         struct qcom_geni_private_data *private_data = uport->private_data;
 276
 277         if (private_data->drv) {
 278                 port = to_dev_port(uport, uport);
 279                 baud = port->baud;
 280                 if (!baud)
 281                         baud = 115200;
 282                 fifo_bits = port->tx_fifo_depth * port->tx_fifo_width;
 283                 /*
 284                  * Total polling iterations based on FIFO worth of bytes to be
 285                  * sent at current baud. Add a little fluff to the wait.
 286                  */
 287                 timeout_us = ((fifo_bits * USEC_PER_SEC) / baud) + 500;
 288         }
 289
 290         /*
 291          * Use custom implementation instead of readl_poll_atomic since ktimer
 292          * is not ready at the time of early console.
 293          */
 294         timeout_us = DIV_ROUND_UP(timeout_us, 10) * 10;
 295         while (timeout_us) {
 296                 reg = readl(uport->membase + offset);
 297                 if ((bool)(reg & field) == set)
 298                         return true;
 299                 udelay(10);
 300                 timeout_us -= 10;
 301         }
 302         return false;
 303 }
 304
 305 static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size)
 306 {
 307         u32 m_cmd;
 308
 309         writel(xmit_size, uport->membase + SE_UART_TX_TRANS_LEN);
 310         m_cmd = UART_START_TX << M_OPCODE_SHFT;
 311         writel(m_cmd, uport->membase + SE_GENI_M_CMD0);
 312 }
 313
 314 static void qcom_geni_serial_poll_tx_done(struct uart_port *uport)
 315 {
 316         int done;
 317         u32 irq_clear = M_CMD_DONE_EN;
 318
 319         done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 320                                                 M_CMD_DONE_EN, true);
 321         if (!done) {
 322                 writel(M_GENI_CMD_ABORT, uport->membase +
 323                                                 SE_GENI_M_CMD_CTRL_REG);
 324                 irq_clear |= M_CMD_ABORT_EN;
 325                 qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 326                                                         M_CMD_ABORT_EN, true);
 327         }
 328         writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR);
 329 }
 330
 331 static void qcom_geni_serial_abort_rx(struct uart_port *uport)
 332 {
 333         u32 irq_clear = S_CMD_DONE_EN | S_CMD_ABORT_EN;
 334
 335         writel(S_GENI_CMD_ABORT, uport->membase + SE_GENI_S_CMD_CTRL_REG);
 336         qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG,
 337                                         S_GENI_CMD_ABORT, false);
 338         writel(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR);
 339         writel(FORCE_DEFAULT, uport->membase + GENI_FORCE_DEFAULT_REG);
 340 }
 341
 342 #ifdef CONFIG_CONSOLE_POLL
 343
 344 static int qcom_geni_serial_get_char(struct uart_port *uport)
 345 {
 346         struct qcom_geni_private_data *private_data = uport->private_data;
 347         u32 status;
 348         u32 word_cnt;
 349         int ret;
 350
 351         if (!private_data->poll_cached_bytes_cnt) {
 352                 status = readl(uport->membase + SE_GENI_M_IRQ_STATUS);
 353                 writel(status, uport->membase + SE_GENI_M_IRQ_CLEAR);
 354
 355                 status = readl(uport->membase + SE_GENI_S_IRQ_STATUS);
 356                 writel(status, uport->membase + SE_GENI_S_IRQ_CLEAR);
 357
 358                 status = readl(uport->membase + SE_GENI_RX_FIFO_STATUS);
 359                 word_cnt = status & RX_FIFO_WC_MSK;
 360                 if (!word_cnt)
 361                         return NO_POLL_CHAR;
 362
 363                 if (word_cnt == 1 && (status & RX_LAST))
 364                         /*
 365                          * NOTE: If RX_LAST_BYTE_VALID is 0 it needs to be
 366                          * treated as if it was BYTES_PER_FIFO_WORD.
 367                          */
 368                         private_data->poll_cached_bytes_cnt =
 369                                 (status & RX_LAST_BYTE_VALID_MSK) >>
 370                                 RX_LAST_BYTE_VALID_SHFT;
 371
 372                 if (private_data->poll_cached_bytes_cnt == 0)
 373                         private_data->poll_cached_bytes_cnt = BYTES_PER_FIFO_WORD;
 374
 375                 private_data->poll_cached_bytes =
 376                         readl(uport->membase + SE_GENI_RX_FIFOn);
 377         }
 378
 379         private_data->poll_cached_bytes_cnt--;
 380         ret = private_data->poll_cached_bytes & 0xff;
 381         private_data->poll_cached_bytes >>= 8;
 382
 383         return ret;
 384 }
 385
 386 static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
 387                                                         unsigned char c)
 388 {
 389         writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
 390         qcom_geni_serial_setup_tx(uport, 1);
 391         WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 392                                                 M_TX_FIFO_WATERMARK_EN, true));
 393         writel(c, uport->membase + SE_GENI_TX_FIFOn);
 394         writel(M_TX_FIFO_WATERMARK_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
 395         qcom_geni_serial_poll_tx_done(uport);
 396 }
 397 #endif
 398
 399 #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE
 400 static void qcom_geni_serial_wr_char(struct uart_port *uport, int ch)
 401 {
 402         struct qcom_geni_private_data *private_data = uport->private_data;
 403
 404         private_data->write_cached_bytes =
 405                 (private_data->write_cached_bytes >> 8) | (ch << 24);
 406         private_data->write_cached_bytes_cnt++;
 407
 408         if (private_data->write_cached_bytes_cnt == BYTES_PER_FIFO_WORD) {
 409                 writel(private_data->write_cached_bytes,
 410                        uport->membase + SE_GENI_TX_FIFOn);
 411                 private_data->write_cached_bytes_cnt = 0;
 412         }
 413 }
 414
 415 static void
 416 __qcom_geni_serial_console_write(struct uart_port *uport, const char *s,
 417                                  unsigned int count)
 418 {
 419         struct qcom_geni_private_data *private_data = uport->private_data;
 420
 421         int i;
 422         u32 bytes_to_send = count;
 423
 424         for (i = 0; i < count; i++) {
 425                 /*
 426                  * uart_console_write() adds a carriage return for each newline.
 427                  * Account for additional bytes to be written.
 428                  */
 429                 if (s[i] == '\n')
 430                         bytes_to_send++;
 431         }
 432
 433         writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
 434         qcom_geni_serial_setup_tx(uport, bytes_to_send);
 435         for (i = 0; i < count; ) {
 436                 size_t chars_to_write = 0;
 437                 size_t avail = DEF_FIFO_DEPTH_WORDS - DEF_TX_WM;
 438
 439                 /*
 440                  * If the WM bit never set, then the Tx state machine is not
 441                  * in a valid state, so break, cancel/abort any existing
 442                  * command. Unfortunately the current data being written is
 443                  * lost.
 444                  */
 445                 if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 446                                                 M_TX_FIFO_WATERMARK_EN, true))
 447                         break;
 448                 chars_to_write = min_t(size_t, count - i, avail / 2);
 449                 uart_console_write(uport, s + i, chars_to_write,
 450                                                 qcom_geni_serial_wr_char);
 451                 writel(M_TX_FIFO_WATERMARK_EN, uport->membase +
 452                                                         SE_GENI_M_IRQ_CLEAR);
 453                 i += chars_to_write;
 454         }
 455
 456         if (private_data->write_cached_bytes_cnt) {
 457                 private_data->write_cached_bytes >>= BITS_PER_BYTE *
 458                         (BYTES_PER_FIFO_WORD - private_data->write_cached_bytes_cnt);
 459                 writel(private_data->write_cached_bytes,
 460                        uport->membase + SE_GENI_TX_FIFOn);
 461                 private_data->write_cached_bytes_cnt = 0;
 462         }
 463
 464         qcom_geni_serial_poll_tx_done(uport);
 465 }
 466
 467 static void qcom_geni_serial_console_write(struct console *co, const char *s,
 468                               unsigned int count)
 469 {
 470         struct uart_port *uport;
 471         struct qcom_geni_serial_port *port;
 472         bool locked = true;
 473         unsigned long flags;
 474         u32 geni_status;
 475         u32 irq_en;
 476
 477         WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS);
 478
 479         port = get_port_from_line(co->index, true);
 480         if (IS_ERR(port))
 481                 return;
 482
 483         uport = &port->uport;
 484         if (oops_in_progress)
 485                 locked = spin_trylock_irqsave(&uport->lock, flags);
 486         else
 487                 spin_lock_irqsave(&uport->lock, flags);
 488
 489         geni_status = readl(uport->membase + SE_GENI_STATUS);
 490
 491         /* Cancel the current write to log the fault */
 492         if (!locked) {
 493                 geni_se_cancel_m_cmd(&port->se);
 494                 if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 495                                                 M_CMD_CANCEL_EN, true)) {
 496                         geni_se_abort_m_cmd(&port->se);
 497                         qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 498                                                         M_CMD_ABORT_EN, true);
 499                         writel(M_CMD_ABORT_EN, uport->membase +
 500                                                         SE_GENI_M_IRQ_CLEAR);
 501                 }
 502                 writel(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
 503         } else if ((geni_status & M_GENI_CMD_ACTIVE) && !port->tx_remaining) {
 504                 /*
 505                  * It seems we can't interrupt existing transfers if all data
 506                  * has been sent, in which case we need to look for done first.
 507                  */
 508                 qcom_geni_serial_poll_tx_done(uport);
 509
 510                 if (uart_circ_chars_pending(&uport->state->xmit)) {
 511                         irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 512                         writel(irq_en | M_TX_FIFO_WATERMARK_EN,
 513                                         uport->membase + SE_GENI_M_IRQ_EN);
 514                 }
 515         }
 516
 517         __qcom_geni_serial_console_write(uport, s, count);
 518
 519         if (port->tx_remaining)
 520                 qcom_geni_serial_setup_tx(uport, port->tx_remaining);
 521
 522         if (locked)
 523                 spin_unlock_irqrestore(&uport->lock, flags);
 524 }
 525
 526 static int handle_rx_console(struct uart_port *uport, u32 bytes, bool drop)
 527 {
 528         u32 i;
 529         unsigned char buf[sizeof(u32)];
 530         struct tty_port *tport;
 531         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 532
 533         tport = &uport->state->port;
 534         for (i = 0; i < bytes; ) {
 535                 int c;
 536                 int chunk = min_t(int, bytes - i, BYTES_PER_FIFO_WORD);
 537
 538                 ioread32_rep(uport->membase + SE_GENI_RX_FIFOn, buf, 1);
 539                 i += chunk;
 540                 if (drop)
 541                         continue;
 542
 543                 for (c = 0; c < chunk; c++) {
 544                         int sysrq;
 545
 546                         uport->icount.rx++;
 547                         if (port->brk && buf[c] == 0) {
 548                                 port->brk = false;
 549                                 if (uart_handle_break(uport))
 550                                         continue;
 551                         }
 552
 553                         sysrq = uart_prepare_sysrq_char(uport, buf[c]);
 554
 555                         if (!sysrq)
 556                                 tty_insert_flip_char(tport, buf[c], TTY_NORMAL);
 557                 }
 558         }
 559         if (!drop)
 560                 tty_flip_buffer_push(tport);
 561         return 0;
 562 }
 563 #else
 564 static int handle_rx_console(struct uart_port *uport, u32 bytes, bool drop)
 565 {
 566         return -EPERM;
 567 }
 568
 569 #endif /* CONFIG_SERIAL_QCOM_GENI_CONSOLE */
 570
 571 static int handle_rx_uart(struct uart_port *uport, u32 bytes, bool drop)
 572 {
 573         struct tty_port *tport;
 574         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 575         u32 num_bytes_pw = port->tx_fifo_width / BITS_PER_BYTE;
 576         u32 words = ALIGN(bytes, num_bytes_pw) / num_bytes_pw;
 577         int ret;
 578
 579         tport = &uport->state->port;
 580         ioread32_rep(uport->membase + SE_GENI_RX_FIFOn, port->rx_fifo, words);
 581         if (drop)
 582                 return 0;
 583
 584         ret = tty_insert_flip_string(tport, port->rx_fifo, bytes);
 585         if (ret != bytes) {
 586                 dev_err(uport->dev, "%s:Unable to push data ret %d_bytes %d\n",
 587                                 __func__, ret, bytes);
 588                 WARN_ON_ONCE(1);
 589         }
 590         uport->icount.rx += ret;
 591         tty_flip_buffer_push(tport);
 592         return ret;
 593 }
 594
 595 static void qcom_geni_serial_start_tx(struct uart_port *uport)
 596 {
 597         u32 irq_en;
 598         u32 status;
 599
 600         status = readl(uport->membase + SE_GENI_STATUS);
 601         if (status & M_GENI_CMD_ACTIVE)
 602                 return;
 603
 604         if (!qcom_geni_serial_tx_empty(uport))
 605                 return;
 606
 607         irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 608         irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN;
 609
 610         writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
 611         writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
 612 }
 613
 614 static void qcom_geni_serial_stop_tx(struct uart_port *uport)
 615 {
 616         u32 irq_en;
 617         u32 status;
 618         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 619
 620         irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 621         irq_en &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN);
 622         writel(0, uport->membase + SE_GENI_TX_WATERMARK_REG);
 623         writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
 624         status = readl(uport->membase + SE_GENI_STATUS);
 625         /* Possible stop tx is called multiple times. */
 626         if (!(status & M_GENI_CMD_ACTIVE))
 627                 return;
 628
 629         geni_se_cancel_m_cmd(&port->se);
 630         if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 631                                                 M_CMD_CANCEL_EN, true)) {
 632                 geni_se_abort_m_cmd(&port->se);
 633                 qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 634                                                 M_CMD_ABORT_EN, true);
 635                 writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
 636         }
 637         writel(M_CMD_CANCEL_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
 638 }
 639
 640 static void qcom_geni_serial_start_rx(struct uart_port *uport)
 641 {
 642         u32 irq_en;
 643         u32 status;
 644         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 645
 646         status = readl(uport->membase + SE_GENI_STATUS);
 647         if (status & S_GENI_CMD_ACTIVE)
 648                 qcom_geni_serial_stop_rx(uport);
 649
 650         geni_se_setup_s_cmd(&port->se, UART_START_READ, 0);
 651
 652         irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
 653         irq_en |= S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN;
 654         writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
 655
 656         irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 657         irq_en |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
 658         writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
 659 }
 660
 661 static void qcom_geni_serial_stop_rx(struct uart_port *uport)
 662 {
 663         u32 irq_en;
 664         u32 status;
 665         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 666         u32 s_irq_status;
 667
 668         irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
 669         irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN);
 670         writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
 671
 672         irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 673         irq_en &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
 674         writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
 675
 676         status = readl(uport->membase + SE_GENI_STATUS);
 677         /* Possible stop rx is called multiple times. */
 678         if (!(status & S_GENI_CMD_ACTIVE))
 679                 return;
 680
 681         geni_se_cancel_s_cmd(&port->se);
 682         qcom_geni_serial_poll_bit(uport, SE_GENI_S_IRQ_STATUS,
 683                                         S_CMD_CANCEL_EN, true);
 684         /*
 685          * If timeout occurs secondary engine remains active
 686          * and Abort sequence is executed.
 687          */
 688         s_irq_status = readl(uport->membase + SE_GENI_S_IRQ_STATUS);
 689         /* Flush the Rx buffer */
 690         if (s_irq_status & S_RX_FIFO_LAST_EN)
 691                 qcom_geni_serial_handle_rx(uport, true);
 692         writel(s_irq_status, uport->membase + SE_GENI_S_IRQ_CLEAR);
 693
 694         status = readl(uport->membase + SE_GENI_STATUS);
 695         if (status & S_GENI_CMD_ACTIVE)
 696                 qcom_geni_serial_abort_rx(uport);
 697 }
 698
 699 static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop)
 700 {
 701         u32 status;
 702         u32 word_cnt;
 703         u32 last_word_byte_cnt;
 704         u32 last_word_partial;
 705         u32 total_bytes;
 706         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 707
 708         status = readl(uport->membase + SE_GENI_RX_FIFO_STATUS);
 709         word_cnt = status & RX_FIFO_WC_MSK;
 710         last_word_partial = status & RX_LAST;
 711         last_word_byte_cnt = (status & RX_LAST_BYTE_VALID_MSK) >>
 712                                                 RX_LAST_BYTE_VALID_SHFT;
 713
 714         if (!word_cnt)
 715                 return;
 716         total_bytes = BYTES_PER_FIFO_WORD * (word_cnt - 1);
 717         if (last_word_partial && last_word_byte_cnt)
 718                 total_bytes += last_word_byte_cnt;
 719         else
 720                 total_bytes += BYTES_PER_FIFO_WORD;
 721         port->handle_rx(uport, total_bytes, drop);
 722 }
 723
 724 static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done,
 725                 bool active)
 726 {
 727         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 728         struct circ_buf *xmit = &uport->state->xmit;
 729         size_t avail;
 730         size_t remaining;
 731         size_t pending;
 732         int i;
 733         u32 status;
 734         u32 irq_en;
 735         unsigned int chunk;
 736         int tail;
 737
 738         status = readl(uport->membase + SE_GENI_TX_FIFO_STATUS);
 739
 740         /* Complete the current tx command before taking newly added data */
 741         if (active)
 742                 pending = port->tx_remaining;
 743         else
 744                 pending = uart_circ_chars_pending(xmit);
 745
 746         /* All data has been transmitted and acknowledged as received */
 747         if (!pending && !status && done) {
 748                 qcom_geni_serial_stop_tx(uport);
 749                 goto out_write_wakeup;
 750         }
 751
 752         avail = port->tx_fifo_depth - (status & TX_FIFO_WC);
 753         avail *= BYTES_PER_FIFO_WORD;
 754
 755         tail = xmit->tail;
 756         chunk = min(avail, pending);
 757         if (!chunk)
 758                 goto out_write_wakeup;
 759
 760         if (!port->tx_remaining) {
 761                 qcom_geni_serial_setup_tx(uport, pending);
 762                 port->tx_remaining = pending;
 763
 764                 irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 765                 if (!(irq_en & M_TX_FIFO_WATERMARK_EN))
 766                         writel(irq_en | M_TX_FIFO_WATERMARK_EN,
 767                                         uport->membase + SE_GENI_M_IRQ_EN);
 768         }
 769
 770         remaining = chunk;
 771         for (i = 0; i < chunk; ) {
 772                 unsigned int tx_bytes;
 773                 u8 buf[sizeof(u32)];
 774                 int c;
 775
 776                 memset(buf, 0, sizeof(buf));
 777                 tx_bytes = min_t(size_t, remaining, BYTES_PER_FIFO_WORD);
 778
 779                 for (c = 0; c < tx_bytes ; c++) {
 780                         buf[c] = xmit->buf[tail++];
 781                         tail &= UART_XMIT_SIZE - 1;
 782                 }
 783
 784                 iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1);
 785
 786                 i += tx_bytes;
 787                 uport->icount.tx += tx_bytes;
 788                 remaining -= tx_bytes;
 789                 port->tx_remaining -= tx_bytes;
 790         }
 791
 792         xmit->tail = tail;
 793
 794         /*
 795          * The tx fifo watermark is level triggered and latched. Though we had
 796          * cleared it in qcom_geni_serial_isr it will have already reasserted
 797          * so we must clear it again here after our writes.
 798          */
 799         writel(M_TX_FIFO_WATERMARK_EN,
 800                         uport->membase + SE_GENI_M_IRQ_CLEAR);
 801
 802 out_write_wakeup:
 803         if (!port->tx_remaining) {
 804                 irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 805                 if (irq_en & M_TX_FIFO_WATERMARK_EN)
 806                         writel(irq_en & ~M_TX_FIFO_WATERMARK_EN,
 807                                         uport->membase + SE_GENI_M_IRQ_EN);
 808         }
 809
 810         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 811                 uart_write_wakeup(uport);
 812 }
 813
 814 static irqreturn_t qcom_geni_serial_isr(int isr, void *dev)
 815 {
 816         u32 m_irq_en;
 817         u32 m_irq_status;
 818         u32 s_irq_status;
 819         u32 geni_status;
 820         struct uart_port *uport = dev;
 821         bool drop_rx = false;
 822         struct tty_port *tport = &uport->state->port;
 823         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 824
 825         if (uport->suspended)
 826                 return IRQ_NONE;
 827
 828         spin_lock(&uport->lock);
 829
 830         m_irq_status = readl(uport->membase + SE_GENI_M_IRQ_STATUS);
 831         s_irq_status = readl(uport->membase + SE_GENI_S_IRQ_STATUS);
 832         geni_status = readl(uport->membase + SE_GENI_STATUS);
 833         m_irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 834         writel(m_irq_status, uport->membase + SE_GENI_M_IRQ_CLEAR);
 835         writel(s_irq_status, uport->membase + SE_GENI_S_IRQ_CLEAR);
 836
 837         if (WARN_ON(m_irq_status & M_ILLEGAL_CMD_EN))
 838                 goto out_unlock;
 839
 840         if (s_irq_status & S_RX_FIFO_WR_ERR_EN) {
 841                 uport->icount.overrun++;
 842                 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
 843         }
 844
 845         if (m_irq_status & m_irq_en & (M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN))
 846                 qcom_geni_serial_handle_tx(uport, m_irq_status & M_CMD_DONE_EN,
 847                                         geni_status & M_GENI_CMD_ACTIVE);
 848
 849         if (s_irq_status & S_GP_IRQ_0_EN || s_irq_status & S_GP_IRQ_1_EN) {
 850                 if (s_irq_status & S_GP_IRQ_0_EN)
 851                         uport->icount.parity++;
 852                 drop_rx = true;
 853         } else if (s_irq_status & S_GP_IRQ_2_EN ||
 854                                         s_irq_status & S_GP_IRQ_3_EN) {
 855                 uport->icount.brk++;
 856                 port->brk = true;
 857         }
 858
 859         if (s_irq_status & S_RX_FIFO_WATERMARK_EN ||
 860                                         s_irq_status & S_RX_FIFO_LAST_EN)
 861                 qcom_geni_serial_handle_rx(uport, drop_rx);
 862
 863 out_unlock:
 864         uart_unlock_and_check_sysrq(uport);
 865
 866         return IRQ_HANDLED;
 867 }
 868
 869 static void get_tx_fifo_size(struct qcom_geni_serial_port *port)
 870 {
 871         struct uart_port *uport;
 872
 873         uport = &port->uport;
 874         port->tx_fifo_depth = geni_se_get_tx_fifo_depth(&port->se);
 875         port->tx_fifo_width = geni_se_get_tx_fifo_width(&port->se);
 876         port->rx_fifo_depth = geni_se_get_rx_fifo_depth(&port->se);
 877         uport->fifosize =
 878                 (port->tx_fifo_depth * port->tx_fifo_width) / BITS_PER_BYTE;
 879 }
 880
 881
 882 static void qcom_geni_serial_shutdown(struct uart_port *uport)
 883 {
 884         disable_irq(uport->irq);
 885 }
 886
 887 static int qcom_geni_serial_port_setup(struct uart_port *uport)
 888 {
 889         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 890         u32 rxstale = DEFAULT_BITS_PER_CHAR * STALE_TIMEOUT;
 891         u32 proto;
 892         u32 pin_swap;
 893
 894         proto = geni_se_read_proto(&port->se);
 895         if (proto != GENI_SE_UART) {
 896                 dev_err(uport->dev, "Invalid FW loaded, proto: %d\n", proto);
 897                 return -ENXIO;
 898         }
 899
 900         qcom_geni_serial_stop_rx(uport);
 901
 902         get_tx_fifo_size(port);
 903
 904         writel(rxstale, uport->membase + SE_UART_RX_STALE_CNT);
 905
 906         pin_swap = readl(uport->membase + SE_UART_IO_MACRO_CTRL);
 907         if (port->rx_tx_swap) {
 908                 pin_swap &= ~DEFAULT_IO_MACRO_IO2_IO3_MASK;
 909                 pin_swap |= IO_MACRO_IO2_IO3_SWAP;
 910         }
 911         if (port->cts_rts_swap) {
 912                 pin_swap &= ~DEFAULT_IO_MACRO_IO0_IO1_MASK;
 913                 pin_swap |= IO_MACRO_IO0_SEL;
 914         }
 915         /* Configure this register if RX-TX, CTS-RTS pins are swapped */
 916         if (port->rx_tx_swap || port->cts_rts_swap)
 917                 writel(pin_swap, uport->membase + SE_UART_IO_MACRO_CTRL);
 918
 919         /*
 920          * Make an unconditional cancel on the main sequencer to reset
 921          * it else we could end up in data loss scenarios.
 922          */
 923         if (uart_console(uport))
 924                 qcom_geni_serial_poll_tx_done(uport);
 925         geni_se_config_packing(&port->se, BITS_PER_BYTE, BYTES_PER_FIFO_WORD,
 926                                false, true, true);
 927         geni_se_init(&port->se, UART_RX_WM, port->rx_fifo_depth - 2);
 928         geni_se_select_mode(&port->se, GENI_SE_FIFO);
 929         port->setup = true;
 930
 931         return 0;
 932 }
 933
 934 static int qcom_geni_serial_startup(struct uart_port *uport)
 935 {
 936         int ret;
 937         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 938
 939         if (!port->setup) {
 940                 ret = qcom_geni_serial_port_setup(uport);
 941                 if (ret)
 942                         return ret;
 943         }
 944         enable_irq(uport->irq);
 945
 946         return 0;
 947 }
 948
 949 static unsigned long get_clk_cfg(unsigned long clk_freq)
 950 {
 951         int i;
 952
 953         for (i = 0; i < ARRAY_SIZE(root_freq); i++) {
 954                 if (!(root_freq[i] % clk_freq))
 955                         return root_freq[i];
 956         }
 957         return 0;
 958 }
 959
 960 static unsigned long get_clk_div_rate(unsigned int baud,
 961                         unsigned int sampling_rate, unsigned int *clk_div)
 962 {
 963         unsigned long ser_clk;
 964         unsigned long desired_clk;
 965
 966         desired_clk = baud * sampling_rate;
 967         ser_clk = get_clk_cfg(desired_clk);
 968         if (!ser_clk) {
 969                 pr_err("%s: Can't find matching DFS entry for baud %d\n",
 970                                                                 __func__, baud);
 971                 return ser_clk;
 972         }
 973
 974         *clk_div = ser_clk / desired_clk;
 975         return ser_clk;
 976 }
 977
 978 static void qcom_geni_serial_set_termios(struct uart_port *uport,
 979                                 struct ktermios *termios, struct ktermios *old)
 980 {
 981         unsigned int baud;
 982         u32 bits_per_char;
 983         u32 tx_trans_cfg;
 984         u32 tx_parity_cfg;
 985         u32 rx_trans_cfg;
 986         u32 rx_parity_cfg;
 987         u32 stop_bit_len;
 988         unsigned int clk_div;
 989         u32 ser_clk_cfg;
 990         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 991         unsigned long clk_rate;
 992         u32 ver, sampling_rate;
 993         unsigned int avg_bw_core;
 994
 995         qcom_geni_serial_stop_rx(uport);
 996         /* baud rate */
 997         baud = uart_get_baud_rate(uport, termios, old, 300, 4000000);
 998         port->baud = baud;
 999
1000         sampling_rate = UART_OVERSAMPLING;
1001         /* Sampling rate is halved for IP versions >= 2.5 */
1002         ver = geni_se_get_qup_hw_version(&port->se);
1003         if (ver >= QUP_SE_VERSION_2_5)
1004                 sampling_rate /= 2;
1005
1006         clk_rate = get_clk_div_rate(baud, sampling_rate, &clk_div);
1007         if (!clk_rate)
1008                 goto out_restart_rx;
1009
1010         uport->uartclk = clk_rate;
1011         dev_pm_opp_set_rate(uport->dev, clk_rate);
1012         ser_clk_cfg = SER_CLK_EN;
1013         ser_clk_cfg |= clk_div << CLK_DIV_SHFT;
1014
1015         /*
1016          * Bump up BW vote on CPU and CORE path as driver supports FIFO mode
1017          * only.
1018          */
1019         avg_bw_core = (baud > 115200) ? Bps_to_icc(CORE_2X_50_MHZ)
1020                                                 : GENI_DEFAULT_BW;
1021         port->se.icc_paths[GENI_TO_CORE].avg_bw = avg_bw_core;
1022         port->se.icc_paths[CPU_TO_GENI].avg_bw = Bps_to_icc(baud);
1023         geni_icc_set_bw(&port->se);
1024
1025         /* parity */
1026         tx_trans_cfg = readl(uport->membase + SE_UART_TX_TRANS_CFG);
1027         tx_parity_cfg = readl(uport->membase + SE_UART_TX_PARITY_CFG);
1028         rx_trans_cfg = readl(uport->membase + SE_UART_RX_TRANS_CFG);
1029         rx_parity_cfg = readl(uport->membase + SE_UART_RX_PARITY_CFG);
1030         if (termios->c_cflag & PARENB) {
1031                 tx_trans_cfg |= UART_TX_PAR_EN;
1032                 rx_trans_cfg |= UART_RX_PAR_EN;
1033                 tx_parity_cfg |= PAR_CALC_EN;
1034                 rx_parity_cfg |= PAR_CALC_EN;
1035                 if (termios->c_cflag & PARODD) {
1036                         tx_parity_cfg |= PAR_ODD;
1037                         rx_parity_cfg |= PAR_ODD;
1038                 } else if (termios->c_cflag & CMSPAR) {
1039                         tx_parity_cfg |= PAR_SPACE;
1040                         rx_parity_cfg |= PAR_SPACE;
1041                 } else {
1042                         tx_parity_cfg |= PAR_EVEN;
1043                         rx_parity_cfg |= PAR_EVEN;
1044                 }
1045         } else {
1046                 tx_trans_cfg &= ~UART_TX_PAR_EN;
1047                 rx_trans_cfg &= ~UART_RX_PAR_EN;
1048                 tx_parity_cfg &= ~PAR_CALC_EN;
1049                 rx_parity_cfg &= ~PAR_CALC_EN;
1050         }
1051
1052         /* bits per char */
1053         bits_per_char = tty_get_char_size(termios->c_cflag);
1054
1055         /* stop bits */
1056         if (termios->c_cflag & CSTOPB)
1057                 stop_bit_len = TX_STOP_BIT_LEN_2;
1058         else
1059                 stop_bit_len = TX_STOP_BIT_LEN_1;
1060
1061         /* flow control, clear the CTS_MASK bit if using flow control. */
1062         if (termios->c_cflag & CRTSCTS)
1063                 tx_trans_cfg &= ~UART_CTS_MASK;
1064         else
1065                 tx_trans_cfg |= UART_CTS_MASK;
1066
1067         if (baud)
1068                 uart_update_timeout(uport, termios->c_cflag, baud);
1069
1070         if (!uart_console(uport))
1071                 writel(port->loopback,
1072                                 uport->membase + SE_UART_LOOPBACK_CFG);
1073         writel(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG);
1074         writel(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG);
1075         writel(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG);
1076         writel(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG);
1077         writel(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN);
1078         writel(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN);
1079         writel(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN);
1080         writel(ser_clk_cfg, uport->membase + GENI_SER_M_CLK_CFG);
1081         writel(ser_clk_cfg, uport->membase + GENI_SER_S_CLK_CFG);
1082 out_restart_rx:
1083         qcom_geni_serial_start_rx(uport);
1084 }
1085
1086 static unsigned int qcom_geni_serial_tx_empty(struct uart_port *uport)
1087 {
1088         return !readl(uport->membase + SE_GENI_TX_FIFO_STATUS);
1089 }
1090
1091 #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE
1092 static int qcom_geni_console_setup(struct console *co, char *options)
1093 {
1094         struct uart_port *uport;
1095         struct qcom_geni_serial_port *port;
1096         int baud = 115200;
1097         int bits = 8;
1098         int parity = 'n';
1099         int flow = 'n';
1100         int ret;
1101
1102         if (co->index >= GENI_UART_CONS_PORTS  || co->index < 0)
1103                 return -ENXIO;
1104
1105         port = get_port_from_line(co->index, true);
1106         if (IS_ERR(port)) {
1107                 pr_err("Invalid line %d\n", co->index);
1108                 return PTR_ERR(port);
1109         }
1110
1111         uport = &port->uport;
1112
1113         if (unlikely(!uport->membase))
1114                 return -ENXIO;
1115
1116         if (!port->setup) {
1117                 ret = qcom_geni_serial_port_setup(uport);
1118                 if (ret)
1119                         return ret;
1120         }
1121
1122         if (options)
1123                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1124
1125         return uart_set_options(uport, co, baud, parity, bits, flow);
1126 }
1127
1128 static void qcom_geni_serial_earlycon_write(struct console *con,
1129                                         const char *s, unsigned int n)
1130 {
1131         struct earlycon_device *dev = con->data;
1132
1133         __qcom_geni_serial_console_write(&dev->port, s, n);
1134 }
1135
1136 #ifdef CONFIG_CONSOLE_POLL
1137 static int qcom_geni_serial_earlycon_read(struct console *con,
1138                                           char *s, unsigned int n)
1139 {
1140         struct earlycon_device *dev = con->data;
1141         struct uart_port *uport = &dev->port;
1142         int num_read = 0;
1143         int ch;
1144
1145         while (num_read < n) {
1146                 ch = qcom_geni_serial_get_char(uport);
1147                 if (ch == NO_POLL_CHAR)
1148                         break;
1149                 s[num_read++] = ch;
1150         }
1151
1152         return num_read;
1153 }
1154
1155 static void __init qcom_geni_serial_enable_early_read(struct geni_se *se,
1156                                                       struct console *con)
1157 {
1158         geni_se_setup_s_cmd(se, UART_START_READ, 0);
1159         con->read = qcom_geni_serial_earlycon_read;
1160 }
1161 #else
1162 static inline void qcom_geni_serial_enable_early_read(struct geni_se *se,
1163                                                       struct console *con) { }
1164 #endif
1165
1166 static struct qcom_geni_private_data earlycon_private_data;
1167
1168 static int __init qcom_geni_serial_earlycon_setup(struct earlycon_device *dev,
1169                                                                 const char *opt)
1170 {
1171         struct uart_port *uport = &dev->port;
1172         u32 tx_trans_cfg;
1173         u32 tx_parity_cfg = 0;  /* Disable Tx Parity */
1174         u32 rx_trans_cfg = 0;
1175         u32 rx_parity_cfg = 0;  /* Disable Rx Parity */
1176         u32 stop_bit_len = 0;   /* Default stop bit length - 1 bit */
1177         u32 bits_per_char;
1178         struct geni_se se;
1179
1180         if (!uport->membase)
1181                 return -EINVAL;
1182
1183         uport->private_data = &earlycon_private_data;
1184
1185         memset(&se, 0, sizeof(se));
1186         se.base = uport->membase;
1187         if (geni_se_read_proto(&se) != GENI_SE_UART)
1188                 return -ENXIO;
1189         /*
1190          * Ignore Flow control.
1191          * n = 8.
1192          */
1193         tx_trans_cfg = UART_CTS_MASK;
1194         bits_per_char = BITS_PER_BYTE;
1195
1196         /*
1197          * Make an unconditional cancel on the main sequencer to reset
1198          * it else we could end up in data loss scenarios.
1199          */
1200         qcom_geni_serial_poll_tx_done(uport);
1201         qcom_geni_serial_abort_rx(uport);
1202         geni_se_config_packing(&se, BITS_PER_BYTE, BYTES_PER_FIFO_WORD,
1203                                false, true, true);
1204         geni_se_init(&se, DEF_FIFO_DEPTH_WORDS / 2, DEF_FIFO_DEPTH_WORDS - 2);
1205         geni_se_select_mode(&se, GENI_SE_FIFO);
1206
1207         writel(tx_trans_cfg, uport->membase + SE_UART_TX_TRANS_CFG);
1208         writel(tx_parity_cfg, uport->membase + SE_UART_TX_PARITY_CFG);
1209         writel(rx_trans_cfg, uport->membase + SE_UART_RX_TRANS_CFG);
1210         writel(rx_parity_cfg, uport->membase + SE_UART_RX_PARITY_CFG);
1211         writel(bits_per_char, uport->membase + SE_UART_TX_WORD_LEN);
1212         writel(bits_per_char, uport->membase + SE_UART_RX_WORD_LEN);
1213         writel(stop_bit_len, uport->membase + SE_UART_TX_STOP_BIT_LEN);
1214
1215         dev->con->write = qcom_geni_serial_earlycon_write;
1216         dev->con->setup = NULL;
1217         qcom_geni_serial_enable_early_read(&se, dev->con);
1218
1219         return 0;
1220 }
1221 OF_EARLYCON_DECLARE(qcom_geni, "qcom,geni-debug-uart",
1222                                 qcom_geni_serial_earlycon_setup);
1223
1224 static int __init console_register(struct uart_driver *drv)
1225 {
1226         return uart_register_driver(drv);
1227 }
1228
1229 static void console_unregister(struct uart_driver *drv)
1230 {
1231         uart_unregister_driver(drv);
1232 }
1233
1234 static struct console cons_ops = {
1235         .name = "ttyMSM",
1236         .write = qcom_geni_serial_console_write,
1237         .device = uart_console_device,
1238         .setup = qcom_geni_console_setup,
1239         .flags = CON_PRINTBUFFER,
1240         .index = -1,
1241         .data = &qcom_geni_console_driver,
1242 };
1243
1244 static struct uart_driver qcom_geni_console_driver = {
1245         .owner = THIS_MODULE,
1246         .driver_name = "qcom_geni_console",
1247         .dev_name = "ttyMSM",
1248         .nr =  GENI_UART_CONS_PORTS,
1249         .cons = &cons_ops,
1250 };
1251 #else
1252 static int console_register(struct uart_driver *drv)
1253 {
1254         return 0;
1255 }
1256
1257 static void console_unregister(struct uart_driver *drv)
1258 {
1259 }
1260 #endif /* CONFIG_SERIAL_QCOM_GENI_CONSOLE */
1261
1262 static struct uart_driver qcom_geni_uart_driver = {
1263         .owner = THIS_MODULE,
1264         .driver_name = "qcom_geni_uart",
1265         .dev_name = "ttyHS",
1266         .nr =  GENI_UART_PORTS,
1267 };
1268
1269 static void qcom_geni_serial_pm(struct uart_port *uport,
1270                 unsigned int new_state, unsigned int old_state)
1271 {
1272         struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
1273
1274         /* If we've never been called, treat it as off */
1275         if (old_state == UART_PM_STATE_UNDEFINED)
1276                 old_state = UART_PM_STATE_OFF;
1277
1278         if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) {
1279                 geni_icc_enable(&port->se);
1280                 geni_se_resources_on(&port->se);
1281         } else if (new_state == UART_PM_STATE_OFF &&
1282                         old_state == UART_PM_STATE_ON) {
1283                 geni_se_resources_off(&port->se);
1284                 geni_icc_disable(&port->se);
1285         }
1286 }
1287
1288 static const struct uart_ops qcom_geni_console_pops = {
1289         .tx_empty = qcom_geni_serial_tx_empty,
1290         .stop_tx = qcom_geni_serial_stop_tx,
1291         .start_tx = qcom_geni_serial_start_tx,
1292         .stop_rx = qcom_geni_serial_stop_rx,
1293         .set_termios = qcom_geni_serial_set_termios,
1294         .startup = qcom_geni_serial_startup,
1295         .request_port = qcom_geni_serial_request_port,
1296         .config_port = qcom_geni_serial_config_port,
1297         .shutdown = qcom_geni_serial_shutdown,
1298         .type = qcom_geni_serial_get_type,
1299         .set_mctrl = qcom_geni_serial_set_mctrl,
1300         .get_mctrl = qcom_geni_serial_get_mctrl,
1301 #ifdef CONFIG_CONSOLE_POLL
1302         .poll_get_char  = qcom_geni_serial_get_char,
1303         .poll_put_char  = qcom_geni_serial_poll_put_char,
1304 #endif
1305         .pm = qcom_geni_serial_pm,
1306 };
1307
1308 static const struct uart_ops qcom_geni_uart_pops = {
1309         .tx_empty = qcom_geni_serial_tx_empty,
1310         .stop_tx = qcom_geni_serial_stop_tx,
1311         .start_tx = qcom_geni_serial_start_tx,
1312         .stop_rx = qcom_geni_serial_stop_rx,
1313         .set_termios = qcom_geni_serial_set_termios,
1314         .startup = qcom_geni_serial_startup,
1315         .request_port = qcom_geni_serial_request_port,
1316         .config_port = qcom_geni_serial_config_port,
1317         .shutdown = qcom_geni_serial_shutdown,
1318         .type = qcom_geni_serial_get_type,
1319         .set_mctrl = qcom_geni_serial_set_mctrl,
1320         .get_mctrl = qcom_geni_serial_get_mctrl,
1321         .pm = qcom_geni_serial_pm,
1322 };
1323
1324 static int qcom_geni_serial_probe(struct platform_device *pdev)
1325 {
1326         int ret = 0;
1327         int line;
1328         struct qcom_geni_serial_port *port;
1329         struct uart_port *uport;
1330         struct resource *res;
1331         int irq;
1332         bool console = false;
1333         struct uart_driver *drv;
1334
1335         if (of_device_is_compatible(pdev->dev.of_node, "qcom,geni-debug-uart"))
1336                 console = true;
1337
1338         if (console) {
1339                 drv = &qcom_geni_console_driver;
1340                 line = of_alias_get_id(pdev->dev.of_node, "serial");
1341         } else {
1342                 drv = &qcom_geni_uart_driver;
1343                 line = of_alias_get_id(pdev->dev.of_node, "hsuart");
1344         }
1345
1346         port = get_port_from_line(line, console);
1347         if (IS_ERR(port)) {
1348                 dev_err(&pdev->dev, "Invalid line %d\n", line);
1349                 return PTR_ERR(port);
1350         }
1351
1352         uport = &port->uport;
1353         /* Don't allow 2 drivers to access the same port */
1354         if (uport->private_data)
1355                 return -ENODEV;
1356
1357         uport->dev = &pdev->dev;
1358         port->se.dev = &pdev->dev;
1359         port->se.wrapper = dev_get_drvdata(pdev->dev.parent);
1360         port->se.clk = devm_clk_get(&pdev->dev, "se");
1361         if (IS_ERR(port->se.clk)) {
1362                 ret = PTR_ERR(port->se.clk);
1363                 dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
1364                 return ret;
1365         }
1366
1367         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1368         if (!res)
1369                 return -EINVAL;
1370         uport->mapbase = res->start;
1371
1372         port->tx_fifo_depth = DEF_FIFO_DEPTH_WORDS;
1373         port->rx_fifo_depth = DEF_FIFO_DEPTH_WORDS;
1374         port->tx_fifo_width = DEF_FIFO_WIDTH_BITS;
1375
1376         if (!console) {
1377                 port->rx_fifo = devm_kcalloc(uport->dev,
1378                         port->rx_fifo_depth, sizeof(u32), GFP_KERNEL);
1379                 if (!port->rx_fifo)
1380                         return -ENOMEM;
1381         }
1382
1383         ret = geni_icc_get(&port->se, NULL);
1384         if (ret)
1385                 return ret;
1386         port->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
1387         port->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
1388
1389         /* Set BW for register access */
1390         ret = geni_icc_set_bw(&port->se);
1391         if (ret)
1392                 return ret;
1393
1394         port->name = devm_kasprintf(uport->dev, GFP_KERNEL,
1395                         "qcom_geni_serial_%s%d",
1396                         uart_console(uport) ? "console" : "uart", uport->line);
1397         if (!port->name)
1398                 return -ENOMEM;
1399
1400         irq = platform_get_irq(pdev, 0);
1401         if (irq < 0)
1402                 return irq;
1403         uport->irq = irq;
1404         uport->has_sysrq = IS_ENABLED(CONFIG_SERIAL_QCOM_GENI_CONSOLE);
1405
1406         if (!console)
1407                 port->wakeup_irq = platform_get_irq_optional(pdev, 1);
1408
1409         if (of_property_read_bool(pdev->dev.of_node, "rx-tx-swap"))
1410                 port->rx_tx_swap = true;
1411
1412         if (of_property_read_bool(pdev->dev.of_node, "cts-rts-swap"))
1413                 port->cts_rts_swap = true;
1414
1415         ret = devm_pm_opp_set_clkname(&pdev->dev, "se");
1416         if (ret)
1417                 return ret;
1418         /* OPP table is optional */
1419         ret = devm_pm_opp_of_add_table(&pdev->dev);
1420         if (ret && ret != -ENODEV) {
1421                 dev_err(&pdev->dev, "invalid OPP table in device tree\n");
1422                 return ret;
1423         }
1424
1425         port->private_data.drv = drv;
1426         uport->private_data = &port->private_data;
1427         platform_set_drvdata(pdev, port);
1428         port->handle_rx = console ? handle_rx_console : handle_rx_uart;
1429
1430         ret = uart_add_one_port(drv, uport);
1431         if (ret)
1432                 return ret;
1433
1434         irq_set_status_flags(uport->irq, IRQ_NOAUTOEN);
1435         ret = devm_request_irq(uport->dev, uport->irq, qcom_geni_serial_isr,
1436                         IRQF_TRIGGER_HIGH, port->name, uport);
1437         if (ret) {
1438                 dev_err(uport->dev, "Failed to get IRQ ret %d\n", ret);
1439                 uart_remove_one_port(drv, uport);
1440                 return ret;
1441         }
1442
1443         /*
1444          * Set pm_runtime status as ACTIVE so that wakeup_irq gets
1445          * enabled/disabled from dev_pm_arm_wake_irq during system
1446          * suspend/resume respectively.
1447          */
1448         pm_runtime_set_active(&pdev->dev);
1449
1450         if (port->wakeup_irq > 0) {
1451                 device_init_wakeup(&pdev->dev, true);
1452                 ret = dev_pm_set_dedicated_wake_irq(&pdev->dev,
1453                                                 port->wakeup_irq);
1454                 if (ret) {
1455                         device_init_wakeup(&pdev->dev, false);
1456                         uart_remove_one_port(drv, uport);
1457                         return ret;
1458                 }
1459         }
1460
1461         return 0;
1462 }
1463
1464 static int qcom_geni_serial_remove(struct platform_device *pdev)
1465 {
1466         struct qcom_geni_serial_port *port = platform_get_drvdata(pdev);
1467         struct uart_driver *drv = port->private_data.drv;
1468
1469         dev_pm_clear_wake_irq(&pdev->dev);
1470         device_init_wakeup(&pdev->dev, false);
1471         uart_remove_one_port(drv, &port->uport);
1472
1473         return 0;
1474 }
1475
1476 static int __maybe_unused qcom_geni_serial_sys_suspend(struct device *dev)
1477 {
1478         struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
1479         struct uart_port *uport = &port->uport;
1480         struct qcom_geni_private_data *private_data = uport->private_data;
1481
1482         /*
1483          * This is done so we can hit the lowest possible state in suspend
1484          * even with no_console_suspend
1485          */
1486         if (uart_console(uport)) {
1487                 geni_icc_set_tag(&port->se, 0x3);
1488                 geni_icc_set_bw(&port->se);
1489         }
1490         return uart_suspend_port(private_data->drv, uport);
1491 }
1492
1493 static int __maybe_unused qcom_geni_serial_sys_resume(struct device *dev)
1494 {
1495         int ret;
1496         struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
1497         struct uart_port *uport = &port->uport;
1498         struct qcom_geni_private_data *private_data = uport->private_data;
1499
1500         ret = uart_resume_port(private_data->drv, uport);
1501         if (uart_console(uport)) {
1502                 geni_icc_set_tag(&port->se, 0x7);
1503                 geni_icc_set_bw(&port->se);
1504         }
1505         return ret;
1506 }
1507
1508 static const struct dev_pm_ops qcom_geni_serial_pm_ops = {
1509         SET_SYSTEM_SLEEP_PM_OPS(qcom_geni_serial_sys_suspend,
1510                                         qcom_geni_serial_sys_resume)
1511 };
1512
1513 static const struct of_device_id qcom_geni_serial_match_table[] = {
1514         { .compatible = "qcom,geni-debug-uart", },
1515         { .compatible = "qcom,geni-uart", },
1516         {}
1517 };
1518 MODULE_DEVICE_TABLE(of, qcom_geni_serial_match_table);
1519
1520 static struct platform_driver qcom_geni_serial_platform_driver = {
1521         .remove = qcom_geni_serial_remove,
1522         .probe = qcom_geni_serial_probe,
1523         .driver = {
1524                 .name = "qcom_geni_serial",
1525                 .of_match_table = qcom_geni_serial_match_table,
1526                 .pm = &qcom_geni_serial_pm_ops,
1527         },
1528 };
1529
1530 static int __init qcom_geni_serial_init(void)
1531 {
1532         int ret;
1533
1534         ret = console_register(&qcom_geni_console_driver);
1535         if (ret)
1536                 return ret;
1537
1538         ret = uart_register_driver(&qcom_geni_uart_driver);
1539         if (ret) {
1540                 console_unregister(&qcom_geni_console_driver);
1541                 return ret;
1542         }
1543
1544         ret = platform_driver_register(&qcom_geni_serial_platform_driver);
1545         if (ret) {
1546                 console_unregister(&qcom_geni_console_driver);
1547                 uart_unregister_driver(&qcom_geni_uart_driver);
1548         }
1549         return ret;
1550 }
1551 module_init(qcom_geni_serial_init);
1552
1553 static void __exit qcom_geni_serial_exit(void)
1554 {
1555         platform_driver_unregister(&qcom_geni_serial_platform_driver);
1556         console_unregister(&qcom_geni_console_driver);
1557         uart_unregister_driver(&qcom_geni_uart_driver);
1558 }
1559 module_exit(qcom_geni_serial_exit);
1560
1561 MODULE_DESCRIPTION("Serial driver for GENI based QUP cores");
1562 MODULE_LICENSE("GPL v2");