jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1 | /* |
| 2 | * max3107.c - spi uart protocol driver for Maxim 3107 |
| 3 | * Based on max3100.c |
| 4 | * by Christian Pellegrin <chripell@evolware.org> |
| 5 | * and max3110.c |
| 6 | * by Feng Tang <feng.tang@intel.com> |
| 7 | * |
| 8 | * Copyright (C) Aavamobile 2009 |
| 9 | * |
| 10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 25 | * |
| 26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/device.h> |
| 32 | #include <linux/serial_core.h> |
| 33 | #include <linux/serial.h> |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 34 | #include <linux/gpio.h> |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 35 | #include <linux/spi/spi.h> |
| 36 | #include <linux/freezer.h> |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 37 | #include "max3107.h" |
| 38 | |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 39 | static const struct baud_table brg26_ext[] = { |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 40 | { 300, MAX3107_BRG26_B300 }, |
| 41 | { 600, MAX3107_BRG26_B600 }, |
| 42 | { 1200, MAX3107_BRG26_B1200 }, |
| 43 | { 2400, MAX3107_BRG26_B2400 }, |
| 44 | { 4800, MAX3107_BRG26_B4800 }, |
| 45 | { 9600, MAX3107_BRG26_B9600 }, |
| 46 | { 19200, MAX3107_BRG26_B19200 }, |
| 47 | { 57600, MAX3107_BRG26_B57600 }, |
| 48 | { 115200, MAX3107_BRG26_B115200 }, |
| 49 | { 230400, MAX3107_BRG26_B230400 }, |
| 50 | { 460800, MAX3107_BRG26_B460800 }, |
| 51 | { 921600, MAX3107_BRG26_B921600 }, |
| 52 | { 0, 0 } |
| 53 | }; |
| 54 | |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 55 | static const struct baud_table brg13_int[] = { |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 56 | { 300, MAX3107_BRG13_IB300 }, |
| 57 | { 600, MAX3107_BRG13_IB600 }, |
| 58 | { 1200, MAX3107_BRG13_IB1200 }, |
| 59 | { 2400, MAX3107_BRG13_IB2400 }, |
| 60 | { 4800, MAX3107_BRG13_IB4800 }, |
| 61 | { 9600, MAX3107_BRG13_IB9600 }, |
| 62 | { 19200, MAX3107_BRG13_IB19200 }, |
| 63 | { 57600, MAX3107_BRG13_IB57600 }, |
| 64 | { 115200, MAX3107_BRG13_IB115200 }, |
| 65 | { 230400, MAX3107_BRG13_IB230400 }, |
| 66 | { 460800, MAX3107_BRG13_IB460800 }, |
| 67 | { 921600, MAX3107_BRG13_IB921600 }, |
| 68 | { 0, 0 } |
| 69 | }; |
| 70 | |
| 71 | static u32 get_new_brg(int baud, struct max3107_port *s) |
| 72 | { |
| 73 | int i; |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 74 | const struct baud_table *baud_tbl = s->baud_tbl; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 75 | |
| 76 | for (i = 0; i < 13; i++) { |
| 77 | if (baud == baud_tbl[i].baud) |
| 78 | return baud_tbl[i].new_brg; |
| 79 | } |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | /* Perform SPI transfer for write/read of device register(s) */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 85 | int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len) |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 86 | { |
| 87 | struct spi_message spi_msg; |
| 88 | struct spi_transfer spi_xfer; |
| 89 | |
| 90 | /* Initialize SPI ,message */ |
| 91 | spi_message_init(&spi_msg); |
| 92 | |
| 93 | /* Initialize SPI transfer */ |
| 94 | memset(&spi_xfer, 0, sizeof spi_xfer); |
| 95 | spi_xfer.len = len; |
| 96 | spi_xfer.tx_buf = tx; |
| 97 | spi_xfer.rx_buf = rx; |
| 98 | spi_xfer.speed_hz = MAX3107_SPI_SPEED; |
| 99 | |
| 100 | /* Add SPI transfer to SPI message */ |
| 101 | spi_message_add_tail(&spi_xfer, &spi_msg); |
| 102 | |
| 103 | #ifdef DBG_TRACE_SPI_DATA |
| 104 | { |
| 105 | int i; |
| 106 | pr_info("tx len %d:\n", spi_xfer.len); |
| 107 | for (i = 0 ; i < spi_xfer.len && i < 32 ; i++) |
| 108 | pr_info(" %x", ((u8 *)spi_xfer.tx_buf)[i]); |
| 109 | pr_info("\n"); |
| 110 | } |
| 111 | #endif |
| 112 | |
| 113 | /* Perform synchronous SPI transfer */ |
| 114 | if (spi_sync(s->spi, &spi_msg)) { |
| 115 | dev_err(&s->spi->dev, "spi_sync failure\n"); |
| 116 | return -EIO; |
| 117 | } |
| 118 | |
| 119 | #ifdef DBG_TRACE_SPI_DATA |
| 120 | if (spi_xfer.rx_buf) { |
| 121 | int i; |
| 122 | pr_info("rx len %d:\n", spi_xfer.len); |
| 123 | for (i = 0 ; i < spi_xfer.len && i < 32 ; i++) |
| 124 | pr_info(" %x", ((u8 *)spi_xfer.rx_buf)[i]); |
| 125 | pr_info("\n"); |
| 126 | } |
| 127 | #endif |
| 128 | return 0; |
| 129 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 130 | EXPORT_SYMBOL_GPL(max3107_rw); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 131 | |
| 132 | /* Puts received data to circular buffer */ |
| 133 | static void put_data_to_circ_buf(struct max3107_port *s, unsigned char *data, |
| 134 | int len) |
| 135 | { |
| 136 | struct uart_port *port = &s->port; |
| 137 | struct tty_struct *tty; |
| 138 | |
| 139 | if (!port->state) |
| 140 | return; |
| 141 | |
| 142 | tty = port->state->port.tty; |
| 143 | if (!tty) |
| 144 | return; |
| 145 | |
| 146 | /* Insert received data */ |
| 147 | tty_insert_flip_string(tty, data, len); |
| 148 | /* Update RX counter */ |
| 149 | port->icount.rx += len; |
| 150 | } |
| 151 | |
| 152 | /* Handle data receiving */ |
| 153 | static void max3107_handlerx(struct max3107_port *s, u16 rxlvl) |
| 154 | { |
| 155 | int i; |
| 156 | int j; |
| 157 | int len; /* SPI transfer buffer length */ |
| 158 | u16 *buf; |
| 159 | u8 *valid_str; |
| 160 | |
| 161 | if (!s->rx_enabled) |
| 162 | /* RX is disabled */ |
| 163 | return; |
| 164 | |
| 165 | if (rxlvl == 0) { |
| 166 | /* RX fifo is empty */ |
| 167 | return; |
| 168 | } else if (rxlvl >= MAX3107_RX_FIFO_SIZE) { |
| 169 | dev_warn(&s->spi->dev, "Possible RX FIFO overrun %d\n", rxlvl); |
| 170 | /* Ensure sanity of RX level */ |
| 171 | rxlvl = MAX3107_RX_FIFO_SIZE; |
| 172 | } |
| 173 | if ((s->rxbuf == 0) || (s->rxstr == 0)) { |
| 174 | dev_warn(&s->spi->dev, "Rx buffer/str isn't ready\n"); |
| 175 | return; |
| 176 | } |
| 177 | buf = s->rxbuf; |
| 178 | valid_str = s->rxstr; |
| 179 | while (rxlvl) { |
| 180 | pr_debug("rxlvl %d\n", rxlvl); |
| 181 | /* Clear buffer */ |
| 182 | memset(buf, 0, sizeof(u16) * (MAX3107_RX_FIFO_SIZE + 2)); |
| 183 | len = 0; |
| 184 | if (s->irqen_reg & MAX3107_IRQ_RXFIFO_BIT) { |
| 185 | /* First disable RX FIFO interrupt */ |
| 186 | pr_debug("Disabling RX INT\n"); |
| 187 | buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG); |
| 188 | s->irqen_reg &= ~MAX3107_IRQ_RXFIFO_BIT; |
| 189 | buf[0] |= s->irqen_reg; |
| 190 | len++; |
| 191 | } |
| 192 | /* Just increase the length by amount of words in FIFO since |
| 193 | * buffer was zeroed and SPI transfer of 0x0000 means reading |
| 194 | * from RX FIFO |
| 195 | */ |
| 196 | len += rxlvl; |
| 197 | /* Append RX level query */ |
| 198 | buf[len] = MAX3107_RXFIFOLVL_REG; |
| 199 | len++; |
| 200 | |
| 201 | /* Perform the SPI transfer */ |
| 202 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, len * 2)) { |
| 203 | dev_err(&s->spi->dev, "SPI transfer for RX h failed\n"); |
| 204 | return; |
| 205 | } |
| 206 | |
| 207 | /* Skip RX FIFO interrupt disabling word if it was added */ |
| 208 | j = ((len - 1) - rxlvl); |
| 209 | /* Read received words */ |
| 210 | for (i = 0; i < rxlvl; i++, j++) |
| 211 | valid_str[i] = (u8)buf[j]; |
| 212 | put_data_to_circ_buf(s, valid_str, rxlvl); |
| 213 | /* Get new RX level */ |
| 214 | rxlvl = (buf[len - 1] & MAX3107_SPI_RX_DATA_MASK); |
| 215 | } |
| 216 | |
| 217 | if (s->rx_enabled) { |
| 218 | /* RX still enabled, re-enable RX FIFO interrupt */ |
| 219 | pr_debug("Enabling RX INT\n"); |
| 220 | buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG); |
| 221 | s->irqen_reg |= MAX3107_IRQ_RXFIFO_BIT; |
| 222 | buf[0] |= s->irqen_reg; |
| 223 | if (max3107_rw(s, (u8 *)buf, NULL, 2)) |
| 224 | dev_err(&s->spi->dev, "RX FIFO INT enabling failed\n"); |
| 225 | } |
| 226 | |
| 227 | /* Push the received data to receivers */ |
| 228 | if (s->port.state->port.tty) |
| 229 | tty_flip_buffer_push(s->port.state->port.tty); |
| 230 | } |
| 231 | |
| 232 | |
| 233 | /* Handle data sending */ |
| 234 | static void max3107_handletx(struct max3107_port *s) |
| 235 | { |
| 236 | struct circ_buf *xmit = &s->port.state->xmit; |
| 237 | int i; |
| 238 | unsigned long flags; |
| 239 | int len; /* SPI transfer buffer length */ |
| 240 | u16 *buf; |
| 241 | |
| 242 | if (!s->tx_fifo_empty) |
| 243 | /* Don't send more data before previous data is sent */ |
| 244 | return; |
| 245 | |
| 246 | if (uart_circ_empty(xmit) || uart_tx_stopped(&s->port)) |
| 247 | /* No data to send or TX is stopped */ |
| 248 | return; |
| 249 | |
| 250 | if (!s->txbuf) { |
| 251 | dev_warn(&s->spi->dev, "Txbuf isn't ready\n"); |
| 252 | return; |
| 253 | } |
| 254 | buf = s->txbuf; |
| 255 | /* Get length of data pending in circular buffer */ |
| 256 | len = uart_circ_chars_pending(xmit); |
| 257 | if (len) { |
| 258 | /* Limit to size of TX FIFO */ |
| 259 | if (len > MAX3107_TX_FIFO_SIZE) |
| 260 | len = MAX3107_TX_FIFO_SIZE; |
| 261 | |
| 262 | pr_debug("txlen %d\n", len); |
| 263 | |
| 264 | /* Update TX counter */ |
| 265 | s->port.icount.tx += len; |
| 266 | |
| 267 | /* TX FIFO will no longer be empty */ |
| 268 | s->tx_fifo_empty = 0; |
| 269 | |
| 270 | i = 0; |
| 271 | if (s->irqen_reg & MAX3107_IRQ_TXEMPTY_BIT) { |
| 272 | /* First disable TX empty interrupt */ |
| 273 | pr_debug("Disabling TE INT\n"); |
| 274 | buf[i] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG); |
| 275 | s->irqen_reg &= ~MAX3107_IRQ_TXEMPTY_BIT; |
| 276 | buf[i] |= s->irqen_reg; |
| 277 | i++; |
| 278 | len++; |
| 279 | } |
| 280 | /* Add data to send */ |
| 281 | spin_lock_irqsave(&s->port.lock, flags); |
| 282 | for ( ; i < len ; i++) { |
| 283 | buf[i] = (MAX3107_WRITE_BIT | MAX3107_THR_REG); |
| 284 | buf[i] |= ((u16)xmit->buf[xmit->tail] & |
| 285 | MAX3107_SPI_TX_DATA_MASK); |
| 286 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 287 | } |
| 288 | spin_unlock_irqrestore(&s->port.lock, flags); |
| 289 | if (!(s->irqen_reg & MAX3107_IRQ_TXEMPTY_BIT)) { |
| 290 | /* Enable TX empty interrupt */ |
| 291 | pr_debug("Enabling TE INT\n"); |
| 292 | buf[i] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG); |
| 293 | s->irqen_reg |= MAX3107_IRQ_TXEMPTY_BIT; |
| 294 | buf[i] |= s->irqen_reg; |
| 295 | i++; |
| 296 | len++; |
| 297 | } |
| 298 | if (!s->tx_enabled) { |
| 299 | /* Enable TX */ |
| 300 | pr_debug("Enable TX\n"); |
| 301 | buf[i] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG); |
| 302 | spin_lock_irqsave(&s->data_lock, flags); |
| 303 | s->mode1_reg &= ~MAX3107_MODE1_TXDIS_BIT; |
| 304 | buf[i] |= s->mode1_reg; |
| 305 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 306 | s->tx_enabled = 1; |
| 307 | i++; |
| 308 | len++; |
| 309 | } |
| 310 | |
| 311 | /* Perform the SPI transfer */ |
| 312 | if (max3107_rw(s, (u8 *)buf, NULL, len*2)) { |
| 313 | dev_err(&s->spi->dev, |
| 314 | "SPI transfer TX handling failed\n"); |
| 315 | return; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | /* Indicate wake up if circular buffer is getting low on data */ |
| 320 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 321 | uart_write_wakeup(&s->port); |
| 322 | |
| 323 | } |
| 324 | |
| 325 | /* Handle interrupts |
| 326 | * Also reads and returns current RX FIFO level |
| 327 | */ |
| 328 | static u16 handle_interrupt(struct max3107_port *s) |
| 329 | { |
| 330 | u16 buf[4]; /* Buffer for SPI transfers */ |
| 331 | u8 irq_status; |
| 332 | u16 rx_level; |
| 333 | unsigned long flags; |
| 334 | |
| 335 | /* Read IRQ status register */ |
| 336 | buf[0] = MAX3107_IRQSTS_REG; |
| 337 | /* Read status IRQ status register */ |
| 338 | buf[1] = MAX3107_STS_IRQSTS_REG; |
| 339 | /* Read LSR IRQ status register */ |
| 340 | buf[2] = MAX3107_LSR_IRQSTS_REG; |
| 341 | /* Query RX level */ |
| 342 | buf[3] = MAX3107_RXFIFOLVL_REG; |
| 343 | |
| 344 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 8)) { |
| 345 | dev_err(&s->spi->dev, |
| 346 | "SPI transfer for INTR handling failed\n"); |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | irq_status = (u8)buf[0]; |
| 351 | pr_debug("IRQSTS %x\n", irq_status); |
| 352 | rx_level = (buf[3] & MAX3107_SPI_RX_DATA_MASK); |
| 353 | |
| 354 | if (irq_status & MAX3107_IRQ_LSR_BIT) { |
| 355 | /* LSR interrupt */ |
| 356 | if (buf[2] & MAX3107_LSR_RXTO_BIT) |
| 357 | /* RX timeout interrupt, |
| 358 | * handled by normal RX handling |
| 359 | */ |
| 360 | pr_debug("RX TO INT\n"); |
| 361 | } |
| 362 | |
| 363 | if (irq_status & MAX3107_IRQ_TXEMPTY_BIT) { |
| 364 | /* Tx empty interrupt, |
| 365 | * disable TX and set tx_fifo_empty flag |
| 366 | */ |
| 367 | pr_debug("TE INT, disabling TX\n"); |
| 368 | buf[0] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG); |
| 369 | spin_lock_irqsave(&s->data_lock, flags); |
| 370 | s->mode1_reg |= MAX3107_MODE1_TXDIS_BIT; |
| 371 | buf[0] |= s->mode1_reg; |
| 372 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 373 | if (max3107_rw(s, (u8 *)buf, NULL, 2)) |
| 374 | dev_err(&s->spi->dev, "SPI transfer TX dis failed\n"); |
| 375 | s->tx_enabled = 0; |
| 376 | s->tx_fifo_empty = 1; |
| 377 | } |
| 378 | |
| 379 | if (irq_status & MAX3107_IRQ_RXFIFO_BIT) |
| 380 | /* RX FIFO interrupt, |
| 381 | * handled by normal RX handling |
| 382 | */ |
| 383 | pr_debug("RFIFO INT\n"); |
| 384 | |
| 385 | /* Return RX level */ |
| 386 | return rx_level; |
| 387 | } |
| 388 | |
| 389 | /* Trigger work thread*/ |
| 390 | static void max3107_dowork(struct max3107_port *s) |
| 391 | { |
| 392 | if (!work_pending(&s->work) && !freezing(current) && !s->suspended) |
| 393 | queue_work(s->workqueue, &s->work); |
| 394 | else |
| 395 | dev_warn(&s->spi->dev, "interrup isn't serviced normally!\n"); |
| 396 | } |
| 397 | |
| 398 | /* Work thread */ |
| 399 | static void max3107_work(struct work_struct *w) |
| 400 | { |
| 401 | struct max3107_port *s = container_of(w, struct max3107_port, work); |
| 402 | u16 rxlvl = 0; |
| 403 | int len; /* SPI transfer buffer length */ |
| 404 | u16 buf[5]; /* Buffer for SPI transfers */ |
| 405 | unsigned long flags; |
| 406 | |
| 407 | /* Start by reading current RX FIFO level */ |
| 408 | buf[0] = MAX3107_RXFIFOLVL_REG; |
| 409 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) { |
| 410 | dev_err(&s->spi->dev, "SPI transfer RX lev failed\n"); |
| 411 | rxlvl = 0; |
| 412 | } else { |
| 413 | rxlvl = (buf[0] & MAX3107_SPI_RX_DATA_MASK); |
| 414 | } |
| 415 | |
| 416 | do { |
| 417 | pr_debug("rxlvl %d\n", rxlvl); |
| 418 | |
| 419 | /* Handle RX */ |
| 420 | max3107_handlerx(s, rxlvl); |
| 421 | rxlvl = 0; |
| 422 | |
| 423 | if (s->handle_irq) { |
| 424 | /* Handle pending interrupts |
| 425 | * We also get new RX FIFO level since new data may |
| 426 | * have been received while pushing received data to |
| 427 | * receivers |
| 428 | */ |
| 429 | s->handle_irq = 0; |
| 430 | rxlvl = handle_interrupt(s); |
| 431 | } |
| 432 | |
| 433 | /* Handle TX */ |
| 434 | max3107_handletx(s); |
| 435 | |
| 436 | /* Handle configuration changes */ |
| 437 | len = 0; |
| 438 | spin_lock_irqsave(&s->data_lock, flags); |
| 439 | if (s->mode1_commit) { |
| 440 | pr_debug("mode1_commit\n"); |
| 441 | buf[len] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG); |
| 442 | buf[len++] |= s->mode1_reg; |
| 443 | s->mode1_commit = 0; |
| 444 | } |
| 445 | if (s->lcr_commit) { |
| 446 | pr_debug("lcr_commit\n"); |
| 447 | buf[len] = (MAX3107_WRITE_BIT | MAX3107_LCR_REG); |
| 448 | buf[len++] |= s->lcr_reg; |
| 449 | s->lcr_commit = 0; |
| 450 | } |
| 451 | if (s->brg_commit) { |
| 452 | pr_debug("brg_commit\n"); |
| 453 | buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVMSB_REG); |
| 454 | buf[len++] |= ((s->brg_cfg >> 16) & |
| 455 | MAX3107_SPI_TX_DATA_MASK); |
| 456 | buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVLSB_REG); |
| 457 | buf[len++] |= ((s->brg_cfg >> 8) & |
| 458 | MAX3107_SPI_TX_DATA_MASK); |
| 459 | buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGCFG_REG); |
| 460 | buf[len++] |= ((s->brg_cfg) & 0xff); |
| 461 | s->brg_commit = 0; |
| 462 | } |
| 463 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 464 | |
| 465 | if (len > 0) { |
| 466 | if (max3107_rw(s, (u8 *)buf, NULL, len * 2)) |
| 467 | dev_err(&s->spi->dev, |
| 468 | "SPI transfer config failed\n"); |
| 469 | } |
| 470 | |
| 471 | /* Reloop if interrupt handling indicated data in RX FIFO */ |
| 472 | } while (rxlvl); |
| 473 | |
| 474 | } |
| 475 | |
| 476 | /* Set sleep mode */ |
| 477 | static void max3107_set_sleep(struct max3107_port *s, int mode) |
| 478 | { |
| 479 | u16 buf[1]; /* Buffer for SPI transfer */ |
| 480 | unsigned long flags; |
| 481 | pr_debug("enter, mode %d\n", mode); |
| 482 | |
| 483 | buf[0] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG); |
| 484 | spin_lock_irqsave(&s->data_lock, flags); |
| 485 | switch (mode) { |
| 486 | case MAX3107_DISABLE_FORCED_SLEEP: |
| 487 | s->mode1_reg &= ~MAX3107_MODE1_FORCESLEEP_BIT; |
| 488 | break; |
| 489 | case MAX3107_ENABLE_FORCED_SLEEP: |
| 490 | s->mode1_reg |= MAX3107_MODE1_FORCESLEEP_BIT; |
| 491 | break; |
| 492 | case MAX3107_DISABLE_AUTOSLEEP: |
| 493 | s->mode1_reg &= ~MAX3107_MODE1_AUTOSLEEP_BIT; |
| 494 | break; |
| 495 | case MAX3107_ENABLE_AUTOSLEEP: |
| 496 | s->mode1_reg |= MAX3107_MODE1_AUTOSLEEP_BIT; |
| 497 | break; |
| 498 | default: |
| 499 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 500 | dev_warn(&s->spi->dev, "invalid sleep mode\n"); |
| 501 | return; |
| 502 | } |
| 503 | buf[0] |= s->mode1_reg; |
| 504 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 505 | |
| 506 | if (max3107_rw(s, (u8 *)buf, NULL, 2)) |
| 507 | dev_err(&s->spi->dev, "SPI transfer sleep mode failed\n"); |
| 508 | |
| 509 | if (mode == MAX3107_DISABLE_AUTOSLEEP || |
| 510 | mode == MAX3107_DISABLE_FORCED_SLEEP) |
| 511 | msleep(MAX3107_WAKEUP_DELAY); |
| 512 | } |
| 513 | |
| 514 | /* Perform full register initialization */ |
| 515 | static void max3107_register_init(struct max3107_port *s) |
| 516 | { |
| 517 | u16 buf[11]; /* Buffer for SPI transfers */ |
| 518 | |
| 519 | /* 1. Configure baud rate, 9600 as default */ |
| 520 | s->baud = 9600; |
| 521 | /* the below is default*/ |
| 522 | if (s->ext_clk) { |
| 523 | s->brg_cfg = MAX3107_BRG26_B9600; |
| 524 | s->baud_tbl = (struct baud_table *)brg26_ext; |
| 525 | } else { |
| 526 | s->brg_cfg = MAX3107_BRG13_IB9600; |
| 527 | s->baud_tbl = (struct baud_table *)brg13_int; |
| 528 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 529 | |
| 530 | if (s->pdata->init) |
| 531 | s->pdata->init(s); |
| 532 | |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 533 | buf[0] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVMSB_REG) |
| 534 | | ((s->brg_cfg >> 16) & MAX3107_SPI_TX_DATA_MASK); |
| 535 | buf[1] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVLSB_REG) |
| 536 | | ((s->brg_cfg >> 8) & MAX3107_SPI_TX_DATA_MASK); |
| 537 | buf[2] = (MAX3107_WRITE_BIT | MAX3107_BRGCFG_REG) |
| 538 | | ((s->brg_cfg) & 0xff); |
| 539 | |
| 540 | /* 2. Configure LCR register, 8N1 mode by default */ |
| 541 | s->lcr_reg = MAX3107_LCR_WORD_LEN_8; |
| 542 | buf[3] = (MAX3107_WRITE_BIT | MAX3107_LCR_REG) |
| 543 | | s->lcr_reg; |
| 544 | |
| 545 | /* 3. Configure MODE 1 register */ |
| 546 | s->mode1_reg = 0; |
| 547 | /* Enable IRQ pin */ |
| 548 | s->mode1_reg |= MAX3107_MODE1_IRQSEL_BIT; |
| 549 | /* Disable TX */ |
| 550 | s->mode1_reg |= MAX3107_MODE1_TXDIS_BIT; |
| 551 | s->tx_enabled = 0; |
| 552 | /* RX is enabled */ |
| 553 | s->rx_enabled = 1; |
| 554 | buf[4] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG) |
| 555 | | s->mode1_reg; |
| 556 | |
| 557 | /* 4. Configure MODE 2 register */ |
| 558 | buf[5] = (MAX3107_WRITE_BIT | MAX3107_MODE2_REG); |
| 559 | if (s->loopback) { |
| 560 | /* Enable loopback */ |
| 561 | buf[5] |= MAX3107_MODE2_LOOPBACK_BIT; |
| 562 | } |
| 563 | /* Reset FIFOs */ |
| 564 | buf[5] |= MAX3107_MODE2_FIFORST_BIT; |
| 565 | s->tx_fifo_empty = 1; |
| 566 | |
| 567 | /* 5. Configure FIFO trigger level register */ |
| 568 | buf[6] = (MAX3107_WRITE_BIT | MAX3107_FIFOTRIGLVL_REG); |
| 569 | /* RX FIFO trigger for 16 words, TX FIFO trigger not used */ |
| 570 | buf[6] |= (MAX3107_FIFOTRIGLVL_RX(16) | MAX3107_FIFOTRIGLVL_TX(0)); |
| 571 | |
| 572 | /* 6. Configure flow control levels */ |
| 573 | buf[7] = (MAX3107_WRITE_BIT | MAX3107_FLOWLVL_REG); |
| 574 | /* Flow control halt level 96, resume level 48 */ |
| 575 | buf[7] |= (MAX3107_FLOWLVL_RES(48) | MAX3107_FLOWLVL_HALT(96)); |
| 576 | |
| 577 | /* 7. Configure flow control */ |
| 578 | buf[8] = (MAX3107_WRITE_BIT | MAX3107_FLOWCTRL_REG); |
| 579 | /* Enable auto CTS and auto RTS flow control */ |
| 580 | buf[8] |= (MAX3107_FLOWCTRL_AUTOCTS_BIT | MAX3107_FLOWCTRL_AUTORTS_BIT); |
| 581 | |
| 582 | /* 8. Configure RX timeout register */ |
| 583 | buf[9] = (MAX3107_WRITE_BIT | MAX3107_RXTO_REG); |
| 584 | /* Timeout after 48 character intervals */ |
| 585 | buf[9] |= 0x0030; |
| 586 | |
| 587 | /* 9. Configure LSR interrupt enable register */ |
| 588 | buf[10] = (MAX3107_WRITE_BIT | MAX3107_LSR_IRQEN_REG); |
| 589 | /* Enable RX timeout interrupt */ |
| 590 | buf[10] |= MAX3107_LSR_RXTO_BIT; |
| 591 | |
| 592 | /* Perform SPI transfer */ |
| 593 | if (max3107_rw(s, (u8 *)buf, NULL, 22)) |
| 594 | dev_err(&s->spi->dev, "SPI transfer for init failed\n"); |
| 595 | |
| 596 | /* 10. Clear IRQ status register by reading it */ |
| 597 | buf[0] = MAX3107_IRQSTS_REG; |
| 598 | |
| 599 | /* 11. Configure interrupt enable register */ |
| 600 | /* Enable LSR interrupt */ |
| 601 | s->irqen_reg = MAX3107_IRQ_LSR_BIT; |
| 602 | /* Enable RX FIFO interrupt */ |
| 603 | s->irqen_reg |= MAX3107_IRQ_RXFIFO_BIT; |
| 604 | buf[1] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG) |
| 605 | | s->irqen_reg; |
| 606 | |
| 607 | /* 12. Clear FIFO reset that was set in step 6 */ |
| 608 | buf[2] = (MAX3107_WRITE_BIT | MAX3107_MODE2_REG); |
| 609 | if (s->loopback) { |
| 610 | /* Keep loopback enabled */ |
| 611 | buf[2] |= MAX3107_MODE2_LOOPBACK_BIT; |
| 612 | } |
| 613 | |
| 614 | /* Perform SPI transfer */ |
| 615 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 6)) |
| 616 | dev_err(&s->spi->dev, "SPI transfer for init failed\n"); |
| 617 | |
| 618 | } |
| 619 | |
| 620 | /* IRQ handler */ |
| 621 | static irqreturn_t max3107_irq(int irqno, void *dev_id) |
| 622 | { |
| 623 | struct max3107_port *s = dev_id; |
| 624 | |
| 625 | if (irqno != s->spi->irq) { |
| 626 | /* Unexpected IRQ */ |
| 627 | return IRQ_NONE; |
| 628 | } |
| 629 | |
| 630 | /* Indicate irq */ |
| 631 | s->handle_irq = 1; |
| 632 | |
| 633 | /* Trigger work thread */ |
| 634 | max3107_dowork(s); |
| 635 | |
| 636 | return IRQ_HANDLED; |
| 637 | } |
| 638 | |
| 639 | /* HW suspension function |
| 640 | * |
| 641 | * Currently autosleep is used to decrease current consumption, alternative |
| 642 | * approach would be to set the chip to reset mode if UART is not being |
| 643 | * used but that would mess the GPIOs |
| 644 | * |
| 645 | */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 646 | void max3107_hw_susp(struct max3107_port *s, int suspend) |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 647 | { |
| 648 | pr_debug("enter, suspend %d\n", suspend); |
| 649 | |
| 650 | if (suspend) { |
| 651 | /* Suspend requested, |
| 652 | * enable autosleep to decrease current consumption |
| 653 | */ |
| 654 | s->suspended = 1; |
| 655 | max3107_set_sleep(s, MAX3107_ENABLE_AUTOSLEEP); |
| 656 | } else { |
| 657 | /* Resume requested, |
| 658 | * disable autosleep |
| 659 | */ |
| 660 | s->suspended = 0; |
| 661 | max3107_set_sleep(s, MAX3107_DISABLE_AUTOSLEEP); |
| 662 | } |
| 663 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 664 | EXPORT_SYMBOL_GPL(max3107_hw_susp); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 665 | |
| 666 | /* Modem status IRQ enabling */ |
| 667 | static void max3107_enable_ms(struct uart_port *port) |
| 668 | { |
| 669 | /* Modem status not supported */ |
| 670 | } |
| 671 | |
| 672 | /* Data send function */ |
| 673 | static void max3107_start_tx(struct uart_port *port) |
| 674 | { |
| 675 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
| 676 | |
| 677 | /* Trigger work thread for sending data */ |
| 678 | max3107_dowork(s); |
| 679 | } |
| 680 | |
| 681 | /* Function for checking that there is no pending transfers */ |
| 682 | static unsigned int max3107_tx_empty(struct uart_port *port) |
| 683 | { |
| 684 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
| 685 | |
| 686 | pr_debug("returning %d\n", |
| 687 | (s->tx_fifo_empty && uart_circ_empty(&s->port.state->xmit))); |
| 688 | return s->tx_fifo_empty && uart_circ_empty(&s->port.state->xmit); |
| 689 | } |
| 690 | |
| 691 | /* Function for stopping RX */ |
| 692 | static void max3107_stop_rx(struct uart_port *port) |
| 693 | { |
| 694 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
| 695 | unsigned long flags; |
| 696 | |
| 697 | /* Set RX disabled in MODE 1 register */ |
| 698 | spin_lock_irqsave(&s->data_lock, flags); |
| 699 | s->mode1_reg |= MAX3107_MODE1_RXDIS_BIT; |
| 700 | s->mode1_commit = 1; |
| 701 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 702 | /* Set RX disabled */ |
| 703 | s->rx_enabled = 0; |
| 704 | /* Trigger work thread for doing the actual configuration change */ |
| 705 | max3107_dowork(s); |
| 706 | } |
| 707 | |
| 708 | /* Function for returning control pin states */ |
| 709 | static unsigned int max3107_get_mctrl(struct uart_port *port) |
| 710 | { |
| 711 | /* DCD and DSR are not wired and CTS/RTS is handled automatically |
| 712 | * so just indicate DSR and CAR asserted |
| 713 | */ |
| 714 | return TIOCM_DSR | TIOCM_CAR; |
| 715 | } |
| 716 | |
| 717 | /* Function for setting control pin states */ |
| 718 | static void max3107_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 719 | { |
| 720 | /* DCD and DSR are not wired and CTS/RTS is hadnled automatically |
| 721 | * so do nothing |
| 722 | */ |
| 723 | } |
| 724 | |
| 725 | /* Function for configuring UART parameters */ |
| 726 | static void max3107_set_termios(struct uart_port *port, |
| 727 | struct ktermios *termios, |
| 728 | struct ktermios *old) |
| 729 | { |
| 730 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
| 731 | struct tty_struct *tty; |
| 732 | int baud; |
| 733 | u16 new_lcr = 0; |
| 734 | u32 new_brg = 0; |
| 735 | unsigned long flags; |
| 736 | |
| 737 | if (!port->state) |
| 738 | return; |
| 739 | |
| 740 | tty = port->state->port.tty; |
| 741 | if (!tty) |
| 742 | return; |
| 743 | |
| 744 | /* Get new LCR register values */ |
| 745 | /* Word size */ |
| 746 | if ((termios->c_cflag & CSIZE) == CS7) |
| 747 | new_lcr |= MAX3107_LCR_WORD_LEN_7; |
| 748 | else |
| 749 | new_lcr |= MAX3107_LCR_WORD_LEN_8; |
| 750 | |
| 751 | /* Parity */ |
| 752 | if (termios->c_cflag & PARENB) { |
| 753 | new_lcr |= MAX3107_LCR_PARITY_BIT; |
| 754 | if (!(termios->c_cflag & PARODD)) |
| 755 | new_lcr |= MAX3107_LCR_EVENPARITY_BIT; |
| 756 | } |
| 757 | |
| 758 | /* Stop bits */ |
| 759 | if (termios->c_cflag & CSTOPB) { |
| 760 | /* 2 stop bits */ |
| 761 | new_lcr |= MAX3107_LCR_STOPLEN_BIT; |
| 762 | } |
| 763 | |
| 764 | /* Mask termios capabilities we don't support */ |
| 765 | termios->c_cflag &= ~CMSPAR; |
| 766 | |
| 767 | /* Set status ignore mask */ |
| 768 | s->port.ignore_status_mask = 0; |
| 769 | if (termios->c_iflag & IGNPAR) |
| 770 | s->port.ignore_status_mask |= MAX3107_ALL_ERRORS; |
| 771 | |
| 772 | /* Set low latency to immediately handle pushed data */ |
| 773 | s->port.state->port.tty->low_latency = 1; |
| 774 | |
| 775 | /* Get new baud rate generator configuration */ |
| 776 | baud = tty_get_baud_rate(tty); |
| 777 | |
| 778 | spin_lock_irqsave(&s->data_lock, flags); |
| 779 | new_brg = get_new_brg(baud, s); |
| 780 | /* if can't find the corrent config, use previous */ |
| 781 | if (!new_brg) { |
| 782 | baud = s->baud; |
| 783 | new_brg = s->brg_cfg; |
| 784 | } |
| 785 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 786 | tty_termios_encode_baud_rate(termios, baud, baud); |
| 787 | s->baud = baud; |
| 788 | |
| 789 | /* Update timeout according to new baud rate */ |
| 790 | uart_update_timeout(port, termios->c_cflag, baud); |
| 791 | |
| 792 | spin_lock_irqsave(&s->data_lock, flags); |
| 793 | if (s->lcr_reg != new_lcr) { |
| 794 | s->lcr_reg = new_lcr; |
| 795 | s->lcr_commit = 1; |
| 796 | } |
| 797 | if (s->brg_cfg != new_brg) { |
| 798 | s->brg_cfg = new_brg; |
| 799 | s->brg_commit = 1; |
| 800 | } |
| 801 | spin_unlock_irqrestore(&s->data_lock, flags); |
| 802 | |
| 803 | /* Trigger work thread for doing the actual configuration change */ |
| 804 | max3107_dowork(s); |
| 805 | } |
| 806 | |
| 807 | /* Port shutdown function */ |
| 808 | static void max3107_shutdown(struct uart_port *port) |
| 809 | { |
| 810 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
| 811 | |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 812 | if (s->suspended && s->pdata->hw_suspend) |
| 813 | s->pdata->hw_suspend(s, 0); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 814 | |
| 815 | /* Free the interrupt */ |
| 816 | free_irq(s->spi->irq, s); |
| 817 | |
| 818 | if (s->workqueue) { |
| 819 | /* Flush and destroy work queue */ |
| 820 | flush_workqueue(s->workqueue); |
| 821 | destroy_workqueue(s->workqueue); |
| 822 | s->workqueue = NULL; |
| 823 | } |
| 824 | |
| 825 | /* Suspend HW */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 826 | if (s->pdata->hw_suspend) |
| 827 | s->pdata->hw_suspend(s, 1); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 828 | } |
| 829 | |
| 830 | /* Port startup function */ |
| 831 | static int max3107_startup(struct uart_port *port) |
| 832 | { |
| 833 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
| 834 | |
| 835 | /* Initialize work queue */ |
| 836 | s->workqueue = create_freezeable_workqueue("max3107"); |
| 837 | if (!s->workqueue) { |
| 838 | dev_err(&s->spi->dev, "Workqueue creation failed\n"); |
| 839 | return -EBUSY; |
| 840 | } |
| 841 | INIT_WORK(&s->work, max3107_work); |
| 842 | |
| 843 | /* Setup IRQ */ |
| 844 | if (request_irq(s->spi->irq, max3107_irq, IRQF_TRIGGER_FALLING, |
| 845 | "max3107", s)) { |
| 846 | dev_err(&s->spi->dev, "IRQ reguest failed\n"); |
| 847 | destroy_workqueue(s->workqueue); |
| 848 | s->workqueue = NULL; |
| 849 | return -EBUSY; |
| 850 | } |
| 851 | |
| 852 | /* Resume HW */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 853 | if (s->pdata->hw_suspend) |
| 854 | s->pdata->hw_suspend(s, 0); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 855 | |
| 856 | /* Init registers */ |
| 857 | max3107_register_init(s); |
| 858 | |
| 859 | return 0; |
| 860 | } |
| 861 | |
| 862 | /* Port type function */ |
| 863 | static const char *max3107_type(struct uart_port *port) |
| 864 | { |
| 865 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
| 866 | return s->spi->modalias; |
| 867 | } |
| 868 | |
| 869 | /* Port release function */ |
| 870 | static void max3107_release_port(struct uart_port *port) |
| 871 | { |
| 872 | /* Do nothing */ |
| 873 | } |
| 874 | |
| 875 | /* Port request function */ |
| 876 | static int max3107_request_port(struct uart_port *port) |
| 877 | { |
| 878 | /* Do nothing */ |
| 879 | return 0; |
| 880 | } |
| 881 | |
| 882 | /* Port config function */ |
| 883 | static void max3107_config_port(struct uart_port *port, int flags) |
| 884 | { |
| 885 | struct max3107_port *s = container_of(port, struct max3107_port, port); |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 886 | s->port.type = PORT_MAX3107; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 887 | } |
| 888 | |
| 889 | /* Port verify function */ |
| 890 | static int max3107_verify_port(struct uart_port *port, |
| 891 | struct serial_struct *ser) |
| 892 | { |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 893 | if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3107) |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 894 | return 0; |
| 895 | |
| 896 | return -EINVAL; |
| 897 | } |
| 898 | |
| 899 | /* Port stop TX function */ |
| 900 | static void max3107_stop_tx(struct uart_port *port) |
| 901 | { |
| 902 | /* Do nothing */ |
| 903 | } |
| 904 | |
| 905 | /* Port break control function */ |
| 906 | static void max3107_break_ctl(struct uart_port *port, int break_state) |
| 907 | { |
| 908 | /* We don't support break control, do nothing */ |
| 909 | } |
| 910 | |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 911 | |
| 912 | /* Port functions */ |
| 913 | static struct uart_ops max3107_ops = { |
| 914 | .tx_empty = max3107_tx_empty, |
| 915 | .set_mctrl = max3107_set_mctrl, |
| 916 | .get_mctrl = max3107_get_mctrl, |
| 917 | .stop_tx = max3107_stop_tx, |
| 918 | .start_tx = max3107_start_tx, |
| 919 | .stop_rx = max3107_stop_rx, |
| 920 | .enable_ms = max3107_enable_ms, |
| 921 | .break_ctl = max3107_break_ctl, |
| 922 | .startup = max3107_startup, |
| 923 | .shutdown = max3107_shutdown, |
| 924 | .set_termios = max3107_set_termios, |
| 925 | .type = max3107_type, |
| 926 | .release_port = max3107_release_port, |
| 927 | .request_port = max3107_request_port, |
| 928 | .config_port = max3107_config_port, |
| 929 | .verify_port = max3107_verify_port, |
| 930 | }; |
| 931 | |
| 932 | /* UART driver data */ |
| 933 | static struct uart_driver max3107_uart_driver = { |
| 934 | .owner = THIS_MODULE, |
| 935 | .driver_name = "ttyMAX", |
| 936 | .dev_name = "ttyMAX", |
| 937 | .nr = 1, |
| 938 | }; |
| 939 | |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 940 | static int driver_registered = 0; |
| 941 | |
| 942 | |
| 943 | |
| 944 | /* 'Generic' platform data */ |
| 945 | static struct max3107_plat generic_plat_data = { |
| 946 | .loopback = 0, |
| 947 | .ext_clk = 1, |
| 948 | .hw_suspend = max3107_hw_susp, |
| 949 | .polled_mode = 0, |
| 950 | .poll_time = 0, |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 951 | }; |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 952 | |
| 953 | |
| 954 | /*******************************************************************/ |
| 955 | |
| 956 | /** |
| 957 | * max3107_probe - SPI bus probe entry point |
| 958 | * @spi: the spi device |
| 959 | * |
| 960 | * SPI wants us to probe this device and if appropriate claim it. |
| 961 | * Perform any platform specific requirements and then initialise |
| 962 | * the device. |
| 963 | */ |
| 964 | |
| 965 | int max3107_probe(struct spi_device *spi, struct max3107_plat *pdata) |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 966 | { |
| 967 | struct max3107_port *s; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 968 | u16 buf[2]; /* Buffer for SPI transfers */ |
| 969 | int retval; |
| 970 | |
| 971 | pr_info("enter max3107 probe\n"); |
| 972 | |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 973 | /* Allocate port structure */ |
| 974 | s = kzalloc(sizeof(*s), GFP_KERNEL); |
| 975 | if (!s) { |
| 976 | pr_err("Allocating port structure failed\n"); |
| 977 | return -ENOMEM; |
| 978 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 979 | |
| 980 | s->pdata = pdata; |
| 981 | |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 982 | /* SPI Rx buffer |
| 983 | * +2 for RX FIFO interrupt |
| 984 | * disabling and RX level query |
| 985 | */ |
| 986 | s->rxbuf = kzalloc(sizeof(u16) * (MAX3107_RX_FIFO_SIZE+2), GFP_KERNEL); |
| 987 | if (!s->rxbuf) { |
| 988 | pr_err("Allocating RX buffer failed\n"); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 989 | retval = -ENOMEM; |
| 990 | goto err_free4; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 991 | } |
| 992 | s->rxstr = kzalloc(sizeof(u8) * MAX3107_RX_FIFO_SIZE, GFP_KERNEL); |
| 993 | if (!s->rxstr) { |
| 994 | pr_err("Allocating RX buffer failed\n"); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 995 | retval = -ENOMEM; |
| 996 | goto err_free3; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 997 | } |
| 998 | /* SPI Tx buffer |
| 999 | * SPI transfer buffer |
| 1000 | * +3 for TX FIFO empty |
| 1001 | * interrupt disabling and |
| 1002 | * enabling and TX enabling |
| 1003 | */ |
| 1004 | s->txbuf = kzalloc(sizeof(u16) * MAX3107_TX_FIFO_SIZE + 3, GFP_KERNEL); |
| 1005 | if (!s->txbuf) { |
| 1006 | pr_err("Allocating TX buffer failed\n"); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1007 | retval = -ENOMEM; |
| 1008 | goto err_free2; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1009 | } |
| 1010 | /* Initialize shared data lock */ |
| 1011 | spin_lock_init(&s->data_lock); |
| 1012 | |
| 1013 | /* SPI intializations */ |
| 1014 | dev_set_drvdata(&spi->dev, s); |
| 1015 | spi->mode = SPI_MODE_0; |
| 1016 | spi->dev.platform_data = pdata; |
| 1017 | spi->bits_per_word = 16; |
| 1018 | s->ext_clk = pdata->ext_clk; |
| 1019 | s->loopback = pdata->loopback; |
| 1020 | spi_setup(spi); |
| 1021 | s->spi = spi; |
| 1022 | |
| 1023 | /* Check REV ID to ensure we are talking to what we expect */ |
| 1024 | buf[0] = MAX3107_REVID_REG; |
| 1025 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) { |
| 1026 | dev_err(&s->spi->dev, "SPI transfer for REVID read failed\n"); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1027 | retval = -EIO; |
| 1028 | goto err_free1; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1029 | } |
| 1030 | if ((buf[0] & MAX3107_SPI_RX_DATA_MASK) != MAX3107_REVID1 && |
| 1031 | (buf[0] & MAX3107_SPI_RX_DATA_MASK) != MAX3107_REVID2) { |
| 1032 | dev_err(&s->spi->dev, "REVID %x does not match\n", |
| 1033 | (buf[0] & MAX3107_SPI_RX_DATA_MASK)); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1034 | retval = -ENODEV; |
| 1035 | goto err_free1; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1036 | } |
| 1037 | |
| 1038 | /* Disable all interrupts */ |
| 1039 | buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG | 0x0000); |
| 1040 | buf[0] |= 0x0000; |
| 1041 | |
| 1042 | /* Configure clock source */ |
| 1043 | buf[1] = (MAX3107_WRITE_BIT | MAX3107_CLKSRC_REG); |
| 1044 | if (s->ext_clk) { |
| 1045 | /* External clock */ |
| 1046 | buf[1] |= MAX3107_CLKSRC_EXTCLK_BIT; |
| 1047 | } |
| 1048 | |
| 1049 | /* PLL bypass ON */ |
| 1050 | buf[1] |= MAX3107_CLKSRC_PLLBYP_BIT; |
| 1051 | |
| 1052 | /* Perform SPI transfer */ |
| 1053 | if (max3107_rw(s, (u8 *)buf, NULL, 4)) { |
| 1054 | dev_err(&s->spi->dev, "SPI transfer for init failed\n"); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1055 | retval = -EIO; |
| 1056 | goto err_free1; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1057 | } |
| 1058 | |
| 1059 | /* Register UART driver */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1060 | if (!driver_registered) { |
| 1061 | retval = uart_register_driver(&max3107_uart_driver); |
| 1062 | if (retval) { |
| 1063 | dev_err(&s->spi->dev, "Registering UART driver failed\n"); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1064 | goto err_free1; |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1065 | } |
| 1066 | driver_registered = 1; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1067 | } |
| 1068 | |
| 1069 | /* Initialize UART port data */ |
| 1070 | s->port.fifosize = 128; |
| 1071 | s->port.ops = &max3107_ops; |
| 1072 | s->port.line = 0; |
| 1073 | s->port.dev = &spi->dev; |
| 1074 | s->port.uartclk = 9600; |
| 1075 | s->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; |
| 1076 | s->port.irq = s->spi->irq; |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1077 | s->port.type = PORT_MAX3107; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1078 | |
| 1079 | /* Add UART port */ |
| 1080 | retval = uart_add_one_port(&max3107_uart_driver, &s->port); |
| 1081 | if (retval < 0) { |
| 1082 | dev_err(&s->spi->dev, "Adding UART port failed\n"); |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1083 | goto err_free1; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1084 | } |
| 1085 | |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1086 | if (pdata->configure) { |
| 1087 | retval = pdata->configure(s); |
| 1088 | if (retval < 0) |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1089 | goto err_free1; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1090 | } |
| 1091 | |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1092 | /* Go to suspend mode */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1093 | if (pdata->hw_suspend) |
| 1094 | pdata->hw_suspend(s, 1); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1095 | |
| 1096 | return 0; |
Davidlohr Bueso | 6870753 | 2010-09-13 12:08:11 -0400 | [diff] [blame] | 1097 | |
| 1098 | err_free1: |
| 1099 | kfree(s->txbuf); |
| 1100 | err_free2: |
| 1101 | kfree(s->rxstr); |
| 1102 | err_free3: |
| 1103 | kfree(s->rxbuf); |
| 1104 | err_free4: |
| 1105 | kfree(s); |
| 1106 | return retval; |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1107 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1108 | EXPORT_SYMBOL_GPL(max3107_probe); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1109 | |
| 1110 | /* Driver remove function */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1111 | int max3107_remove(struct spi_device *spi) |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1112 | { |
| 1113 | struct max3107_port *s = dev_get_drvdata(&spi->dev); |
| 1114 | |
| 1115 | pr_info("enter max3107 remove\n"); |
| 1116 | |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1117 | /* Remove port */ |
| 1118 | if (uart_remove_one_port(&max3107_uart_driver, &s->port)) |
| 1119 | dev_warn(&s->spi->dev, "Removing UART port failed\n"); |
| 1120 | |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1121 | |
| 1122 | /* Free TxRx buffer */ |
| 1123 | kfree(s->rxbuf); |
| 1124 | kfree(s->rxstr); |
| 1125 | kfree(s->txbuf); |
| 1126 | |
| 1127 | /* Free port structure */ |
| 1128 | kfree(s); |
| 1129 | |
| 1130 | return 0; |
| 1131 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1132 | EXPORT_SYMBOL_GPL(max3107_remove); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1133 | |
| 1134 | /* Driver suspend function */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1135 | int max3107_suspend(struct spi_device *spi, pm_message_t state) |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1136 | { |
| 1137 | #ifdef CONFIG_PM |
| 1138 | struct max3107_port *s = dev_get_drvdata(&spi->dev); |
| 1139 | |
| 1140 | pr_debug("enter suspend\n"); |
| 1141 | |
| 1142 | /* Suspend UART port */ |
| 1143 | uart_suspend_port(&max3107_uart_driver, &s->port); |
| 1144 | |
| 1145 | /* Go to suspend mode */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1146 | if (s->pdata->hw_suspend) |
| 1147 | s->pdata->hw_suspend(s, 1); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1148 | #endif /* CONFIG_PM */ |
| 1149 | return 0; |
| 1150 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1151 | EXPORT_SYMBOL_GPL(max3107_suspend); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1152 | |
| 1153 | /* Driver resume function */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1154 | int max3107_resume(struct spi_device *spi) |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1155 | { |
| 1156 | #ifdef CONFIG_PM |
| 1157 | struct max3107_port *s = dev_get_drvdata(&spi->dev); |
| 1158 | |
| 1159 | pr_debug("enter resume\n"); |
| 1160 | |
| 1161 | /* Resume from suspend */ |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1162 | if (s->pdata->hw_suspend) |
| 1163 | s->pdata->hw_suspend(s, 0); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1164 | |
| 1165 | /* Resume UART port */ |
| 1166 | uart_resume_port(&max3107_uart_driver, &s->port); |
| 1167 | #endif /* CONFIG_PM */ |
| 1168 | return 0; |
| 1169 | } |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1170 | EXPORT_SYMBOL_GPL(max3107_resume); |
| 1171 | |
| 1172 | static int max3107_probe_generic(struct spi_device *spi) |
| 1173 | { |
| 1174 | return max3107_probe(spi, &generic_plat_data); |
| 1175 | } |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1176 | |
| 1177 | /* Spi driver data */ |
| 1178 | static struct spi_driver max3107_driver = { |
| 1179 | .driver = { |
| 1180 | .name = "max3107", |
| 1181 | .bus = &spi_bus_type, |
| 1182 | .owner = THIS_MODULE, |
| 1183 | }, |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1184 | .probe = max3107_probe_generic, |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1185 | .remove = __devexit_p(max3107_remove), |
| 1186 | .suspend = max3107_suspend, |
| 1187 | .resume = max3107_resume, |
| 1188 | }; |
| 1189 | |
| 1190 | /* Driver init function */ |
| 1191 | static int __init max3107_init(void) |
| 1192 | { |
| 1193 | pr_info("enter max3107 init\n"); |
| 1194 | return spi_register_driver(&max3107_driver); |
| 1195 | } |
| 1196 | |
| 1197 | /* Driver exit function */ |
| 1198 | static void __exit max3107_exit(void) |
| 1199 | { |
| 1200 | pr_info("enter max3107 exit\n"); |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1201 | /* Unregister UART driver */ |
| 1202 | if (driver_registered) |
| 1203 | uart_unregister_driver(&max3107_uart_driver); |
jianwei.yang | 44318fe | 2010-06-30 17:57:12 +0100 | [diff] [blame] | 1204 | spi_unregister_driver(&max3107_driver); |
| 1205 | } |
| 1206 | |
| 1207 | module_init(max3107_init); |
| 1208 | module_exit(max3107_exit); |
| 1209 | |
| 1210 | MODULE_DESCRIPTION("MAX3107 driver"); |
| 1211 | MODULE_AUTHOR("Aavamobile"); |
Alan Cox | 61fd152 | 2010-06-30 17:58:38 +0100 | [diff] [blame] | 1212 | MODULE_ALIAS("max3107-spi"); |
| 1213 | MODULE_LICENSE("GPL v2"); |