Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 1 | /* |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 2 | * Driver for KS8695 serial ports |
| 3 | * |
| 4 | * Based on drivers/serial/serial_amba.c, by Kam Lee. |
| 5 | * |
| 6 | * Copyright 2002-2005 Micrel Inc. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | */ |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/tty.h> |
Jiri Slaby | ee160a3 | 2011-09-01 16:20:57 +0200 | [diff] [blame] | 16 | #include <linux/tty_flip.h> |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 17 | #include <linux/ioport.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/serial.h> |
| 20 | #include <linux/console.h> |
| 21 | #include <linux/sysrq.h> |
| 22 | #include <linux/device.h> |
| 23 | |
| 24 | #include <asm/io.h> |
| 25 | #include <asm/irq.h> |
| 26 | #include <asm/mach/irq.h> |
| 27 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 28 | #include <mach/regs-uart.h> |
| 29 | #include <mach/regs-irq.h> |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 30 | |
| 31 | #if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 32 | #define SUPPORT_SYSRQ |
| 33 | #endif |
| 34 | |
| 35 | #include <linux/serial_core.h> |
| 36 | |
| 37 | |
| 38 | #define SERIAL_KS8695_MAJOR 204 |
| 39 | #define SERIAL_KS8695_MINOR 16 |
| 40 | #define SERIAL_KS8695_DEVNAME "ttyAM" |
| 41 | |
| 42 | #define SERIAL_KS8695_NR 1 |
| 43 | |
| 44 | /* |
| 45 | * Access macros for the KS8695 UART |
| 46 | */ |
| 47 | #define UART_GET_CHAR(p) (__raw_readl((p)->membase + KS8695_URRB) & 0xFF) |
| 48 | #define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + KS8695_URTH) |
| 49 | #define UART_GET_FCR(p) __raw_readl((p)->membase + KS8695_URFC) |
| 50 | #define UART_PUT_FCR(p, c) __raw_writel((c), (p)->membase + KS8695_URFC) |
| 51 | #define UART_GET_MSR(p) __raw_readl((p)->membase + KS8695_URMS) |
| 52 | #define UART_GET_LSR(p) __raw_readl((p)->membase + KS8695_URLS) |
| 53 | #define UART_GET_LCR(p) __raw_readl((p)->membase + KS8695_URLC) |
| 54 | #define UART_PUT_LCR(p, c) __raw_writel((c), (p)->membase + KS8695_URLC) |
| 55 | #define UART_GET_MCR(p) __raw_readl((p)->membase + KS8695_URMC) |
| 56 | #define UART_PUT_MCR(p, c) __raw_writel((c), (p)->membase + KS8695_URMC) |
| 57 | #define UART_GET_BRDR(p) __raw_readl((p)->membase + KS8695_URBD) |
| 58 | #define UART_PUT_BRDR(p, c) __raw_writel((c), (p)->membase + KS8695_URBD) |
| 59 | |
| 60 | #define KS8695_CLR_TX_INT() __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST) |
| 61 | |
| 62 | #define UART_DUMMY_LSR_RX 0x100 |
| 63 | #define UART_PORT_SIZE (KS8695_USR - KS8695_URRB + 4) |
| 64 | |
Dick Hollenbeck | 457cd4f | 2008-09-16 18:30:27 +0100 | [diff] [blame] | 65 | static inline int tx_enabled(struct uart_port *port) |
| 66 | { |
| 67 | return port->unused[0] & 1; |
| 68 | } |
| 69 | |
| 70 | static inline int rx_enabled(struct uart_port *port) |
| 71 | { |
| 72 | return port->unused[0] & 2; |
| 73 | } |
| 74 | |
| 75 | static inline int ms_enabled(struct uart_port *port) |
| 76 | { |
| 77 | return port->unused[0] & 4; |
| 78 | } |
| 79 | |
| 80 | static inline void ms_enable(struct uart_port *port, int enabled) |
| 81 | { |
| 82 | if(enabled) |
| 83 | port->unused[0] |= 4; |
| 84 | else |
| 85 | port->unused[0] &= ~4; |
| 86 | } |
| 87 | |
| 88 | static inline void rx_enable(struct uart_port *port, int enabled) |
| 89 | { |
| 90 | if(enabled) |
| 91 | port->unused[0] |= 2; |
| 92 | else |
| 93 | port->unused[0] &= ~2; |
| 94 | } |
| 95 | |
| 96 | static inline void tx_enable(struct uart_port *port, int enabled) |
| 97 | { |
| 98 | if(enabled) |
| 99 | port->unused[0] |= 1; |
| 100 | else |
| 101 | port->unused[0] &= ~1; |
| 102 | } |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 103 | |
| 104 | |
| 105 | #ifdef SUPPORT_SYSRQ |
| 106 | static struct console ks8695_console; |
| 107 | #endif |
| 108 | |
| 109 | static void ks8695uart_stop_tx(struct uart_port *port) |
| 110 | { |
| 111 | if (tx_enabled(port)) { |
Dick Hollenbeck | c47a830 | 2009-09-02 17:07:29 +0100 | [diff] [blame] | 112 | /* use disable_irq_nosync() and not disable_irq() to avoid self |
| 113 | * imposed deadlock by not waiting for irq handler to end, |
| 114 | * since this ks8695uart_stop_tx() is called from interrupt context. |
| 115 | */ |
| 116 | disable_irq_nosync(KS8695_IRQ_UART_TX); |
Dick Hollenbeck | 457cd4f | 2008-09-16 18:30:27 +0100 | [diff] [blame] | 117 | tx_enable(port, 0); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 118 | } |
| 119 | } |
| 120 | |
| 121 | static void ks8695uart_start_tx(struct uart_port *port) |
| 122 | { |
| 123 | if (!tx_enabled(port)) { |
| 124 | enable_irq(KS8695_IRQ_UART_TX); |
Dick Hollenbeck | 457cd4f | 2008-09-16 18:30:27 +0100 | [diff] [blame] | 125 | tx_enable(port, 1); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 126 | } |
| 127 | } |
| 128 | |
| 129 | static void ks8695uart_stop_rx(struct uart_port *port) |
| 130 | { |
| 131 | if (rx_enabled(port)) { |
| 132 | disable_irq(KS8695_IRQ_UART_RX); |
Dick Hollenbeck | 457cd4f | 2008-09-16 18:30:27 +0100 | [diff] [blame] | 133 | rx_enable(port, 0); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 134 | } |
| 135 | } |
| 136 | |
| 137 | static void ks8695uart_enable_ms(struct uart_port *port) |
| 138 | { |
Dick Hollenbeck | 457cd4f | 2008-09-16 18:30:27 +0100 | [diff] [blame] | 139 | if (!ms_enabled(port)) { |
| 140 | enable_irq(KS8695_IRQ_UART_MODEM_STATUS); |
| 141 | ms_enable(port,1); |
| 142 | } |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | static void ks8695uart_disable_ms(struct uart_port *port) |
| 146 | { |
Dick Hollenbeck | 457cd4f | 2008-09-16 18:30:27 +0100 | [diff] [blame] | 147 | if (ms_enabled(port)) { |
| 148 | disable_irq(KS8695_IRQ_UART_MODEM_STATUS); |
| 149 | ms_enable(port,0); |
| 150 | } |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id) |
| 154 | { |
| 155 | struct uart_port *port = dev_id; |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 156 | unsigned int status, ch, lsr, flg, max_count = 256; |
| 157 | |
| 158 | status = UART_GET_LSR(port); /* clears pending LSR interrupts */ |
| 159 | while ((status & URLS_URDR) && max_count--) { |
| 160 | ch = UART_GET_CHAR(port); |
| 161 | flg = TTY_NORMAL; |
| 162 | |
| 163 | port->icount.rx++; |
| 164 | |
| 165 | /* |
| 166 | * Note that the error handling code is |
| 167 | * out of the main execution path |
| 168 | */ |
| 169 | lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX; |
| 170 | if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) { |
| 171 | if (lsr & URLS_URBI) { |
| 172 | lsr &= ~(URLS_URFE | URLS_URPE); |
| 173 | port->icount.brk++; |
| 174 | if (uart_handle_break(port)) |
| 175 | goto ignore_char; |
| 176 | } |
| 177 | if (lsr & URLS_URPE) |
| 178 | port->icount.parity++; |
| 179 | if (lsr & URLS_URFE) |
| 180 | port->icount.frame++; |
| 181 | if (lsr & URLS_URROE) |
| 182 | port->icount.overrun++; |
| 183 | |
| 184 | lsr &= port->read_status_mask; |
| 185 | |
| 186 | if (lsr & URLS_URBI) |
| 187 | flg = TTY_BREAK; |
| 188 | else if (lsr & URLS_URPE) |
| 189 | flg = TTY_PARITY; |
| 190 | else if (lsr & URLS_URFE) |
| 191 | flg = TTY_FRAME; |
| 192 | } |
| 193 | |
| 194 | if (uart_handle_sysrq_char(port, ch)) |
| 195 | goto ignore_char; |
| 196 | |
| 197 | uart_insert_char(port, lsr, URLS_URROE, ch, flg); |
| 198 | |
| 199 | ignore_char: |
| 200 | status = UART_GET_LSR(port); |
| 201 | } |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 202 | tty_flip_buffer_push(&port->state->port); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 203 | |
| 204 | return IRQ_HANDLED; |
| 205 | } |
| 206 | |
| 207 | |
| 208 | static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id) |
| 209 | { |
| 210 | struct uart_port *port = dev_id; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 211 | struct circ_buf *xmit = &port->state->xmit; |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 212 | unsigned int count; |
| 213 | |
| 214 | if (port->x_char) { |
| 215 | KS8695_CLR_TX_INT(); |
| 216 | UART_PUT_CHAR(port, port->x_char); |
| 217 | port->icount.tx++; |
| 218 | port->x_char = 0; |
| 219 | return IRQ_HANDLED; |
| 220 | } |
| 221 | |
| 222 | if (uart_tx_stopped(port) || uart_circ_empty(xmit)) { |
| 223 | ks8695uart_stop_tx(port); |
| 224 | return IRQ_HANDLED; |
| 225 | } |
| 226 | |
| 227 | count = 16; /* fifo size */ |
| 228 | while (!uart_circ_empty(xmit) && (count-- > 0)) { |
| 229 | KS8695_CLR_TX_INT(); |
| 230 | UART_PUT_CHAR(port, xmit->buf[xmit->tail]); |
| 231 | |
| 232 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 233 | port->icount.tx++; |
| 234 | } |
| 235 | |
| 236 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 237 | uart_write_wakeup(port); |
| 238 | |
| 239 | if (uart_circ_empty(xmit)) |
| 240 | ks8695uart_stop_tx(port); |
| 241 | |
| 242 | return IRQ_HANDLED; |
| 243 | } |
| 244 | |
| 245 | static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id) |
| 246 | { |
| 247 | struct uart_port *port = dev_id; |
| 248 | unsigned int status; |
| 249 | |
| 250 | /* |
| 251 | * clear modem interrupt by reading MSR |
| 252 | */ |
| 253 | status = UART_GET_MSR(port); |
| 254 | |
| 255 | if (status & URMS_URDDCD) |
| 256 | uart_handle_dcd_change(port, status & URMS_URDDCD); |
| 257 | |
| 258 | if (status & URMS_URDDST) |
| 259 | port->icount.dsr++; |
| 260 | |
| 261 | if (status & URMS_URDCTS) |
| 262 | uart_handle_cts_change(port, status & URMS_URDCTS); |
| 263 | |
| 264 | if (status & URMS_URTERI) |
| 265 | port->icount.rng++; |
| 266 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 267 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 268 | |
| 269 | return IRQ_HANDLED; |
| 270 | } |
| 271 | |
| 272 | static unsigned int ks8695uart_tx_empty(struct uart_port *port) |
| 273 | { |
| 274 | return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0; |
| 275 | } |
| 276 | |
| 277 | static unsigned int ks8695uart_get_mctrl(struct uart_port *port) |
| 278 | { |
| 279 | unsigned int result = 0; |
| 280 | unsigned int status; |
| 281 | |
| 282 | status = UART_GET_MSR(port); |
| 283 | if (status & URMS_URDCD) |
| 284 | result |= TIOCM_CAR; |
| 285 | if (status & URMS_URDSR) |
| 286 | result |= TIOCM_DSR; |
| 287 | if (status & URMS_URCTS) |
| 288 | result |= TIOCM_CTS; |
| 289 | if (status & URMS_URRI) |
| 290 | result |= TIOCM_RI; |
| 291 | |
| 292 | return result; |
| 293 | } |
| 294 | |
| 295 | static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl) |
| 296 | { |
| 297 | unsigned int mcr; |
| 298 | |
| 299 | mcr = UART_GET_MCR(port); |
| 300 | if (mctrl & TIOCM_RTS) |
| 301 | mcr |= URMC_URRTS; |
| 302 | else |
| 303 | mcr &= ~URMC_URRTS; |
| 304 | |
| 305 | if (mctrl & TIOCM_DTR) |
| 306 | mcr |= URMC_URDTR; |
| 307 | else |
| 308 | mcr &= ~URMC_URDTR; |
| 309 | |
| 310 | UART_PUT_MCR(port, mcr); |
| 311 | } |
| 312 | |
| 313 | static void ks8695uart_break_ctl(struct uart_port *port, int break_state) |
| 314 | { |
| 315 | unsigned int lcr; |
| 316 | |
| 317 | lcr = UART_GET_LCR(port); |
| 318 | |
| 319 | if (break_state == -1) |
| 320 | lcr |= URLC_URSBC; |
| 321 | else |
| 322 | lcr &= ~URLC_URSBC; |
| 323 | |
| 324 | UART_PUT_LCR(port, lcr); |
| 325 | } |
| 326 | |
| 327 | static int ks8695uart_startup(struct uart_port *port) |
| 328 | { |
| 329 | int retval; |
| 330 | |
Rob Herring | 2a44624 | 2015-06-09 13:26:39 -0500 | [diff] [blame] | 331 | irq_modify_status(KS8695_IRQ_UART_TX, IRQ_NOREQUEST, IRQ_NOAUTOEN); |
Dick Hollenbeck | 457cd4f | 2008-09-16 18:30:27 +0100 | [diff] [blame] | 332 | tx_enable(port, 0); |
| 333 | rx_enable(port, 1); |
| 334 | ms_enable(port, 1); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 335 | |
| 336 | /* |
| 337 | * Allocate the IRQ |
| 338 | */ |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 339 | retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, 0, "UART TX", port); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 340 | if (retval) |
| 341 | goto err_tx; |
| 342 | |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 343 | retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, 0, "UART RX", port); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 344 | if (retval) |
| 345 | goto err_rx; |
| 346 | |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 347 | retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, 0, "UART LineStatus", port); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 348 | if (retval) |
Andrew Victor | e45c7a4 | 2007-05-14 14:32:43 +0100 | [diff] [blame] | 349 | goto err_ls; |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 350 | |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 351 | retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, 0, "UART ModemStatus", port); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 352 | if (retval) |
Andrew Victor | e45c7a4 | 2007-05-14 14:32:43 +0100 | [diff] [blame] | 353 | goto err_ms; |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 354 | |
| 355 | return 0; |
| 356 | |
| 357 | err_ms: |
| 358 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); |
| 359 | err_ls: |
| 360 | free_irq(KS8695_IRQ_UART_RX, port); |
| 361 | err_rx: |
| 362 | free_irq(KS8695_IRQ_UART_TX, port); |
| 363 | err_tx: |
| 364 | return retval; |
| 365 | } |
| 366 | |
| 367 | static void ks8695uart_shutdown(struct uart_port *port) |
| 368 | { |
| 369 | /* |
| 370 | * Free the interrupt |
| 371 | */ |
| 372 | free_irq(KS8695_IRQ_UART_RX, port); |
| 373 | free_irq(KS8695_IRQ_UART_TX, port); |
| 374 | free_irq(KS8695_IRQ_UART_MODEM_STATUS, port); |
| 375 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); |
| 376 | |
| 377 | /* disable break condition and fifos */ |
| 378 | UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC); |
| 379 | UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE); |
| 380 | } |
| 381 | |
| 382 | static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) |
| 383 | { |
| 384 | unsigned int lcr, fcr = 0; |
| 385 | unsigned long flags; |
| 386 | unsigned int baud, quot; |
| 387 | |
| 388 | /* |
| 389 | * Ask the core to calculate the divisor for us. |
| 390 | */ |
| 391 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
| 392 | quot = uart_get_divisor(port, baud); |
| 393 | |
| 394 | switch (termios->c_cflag & CSIZE) { |
| 395 | case CS5: |
| 396 | lcr = URCL_5; |
| 397 | break; |
| 398 | case CS6: |
| 399 | lcr = URCL_6; |
| 400 | break; |
| 401 | case CS7: |
| 402 | lcr = URCL_7; |
| 403 | break; |
| 404 | default: |
| 405 | lcr = URCL_8; |
| 406 | break; |
| 407 | } |
| 408 | |
| 409 | /* stop bits */ |
| 410 | if (termios->c_cflag & CSTOPB) |
| 411 | lcr |= URLC_URSB; |
| 412 | |
| 413 | /* parity */ |
| 414 | if (termios->c_cflag & PARENB) { |
| 415 | if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */ |
| 416 | if (termios->c_cflag & PARODD) |
| 417 | lcr |= URPE_MARK; |
| 418 | else |
| 419 | lcr |= URPE_SPACE; |
| 420 | } |
| 421 | else if (termios->c_cflag & PARODD) |
| 422 | lcr |= URPE_ODD; |
| 423 | else |
| 424 | lcr |= URPE_EVEN; |
| 425 | } |
| 426 | |
| 427 | if (port->fifosize > 1) |
| 428 | fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE; |
| 429 | |
| 430 | spin_lock_irqsave(&port->lock, flags); |
| 431 | |
| 432 | /* |
| 433 | * Update the per-port timeout. |
| 434 | */ |
| 435 | uart_update_timeout(port, termios->c_cflag, baud); |
| 436 | |
| 437 | port->read_status_mask = URLS_URROE; |
| 438 | if (termios->c_iflag & INPCK) |
| 439 | port->read_status_mask |= (URLS_URFE | URLS_URPE); |
Peter Hurley | ef8b9dd | 2014-06-16 08:10:41 -0400 | [diff] [blame] | 440 | if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 441 | port->read_status_mask |= URLS_URBI; |
| 442 | |
| 443 | /* |
| 444 | * Characters to ignore |
| 445 | */ |
| 446 | port->ignore_status_mask = 0; |
| 447 | if (termios->c_iflag & IGNPAR) |
| 448 | port->ignore_status_mask |= (URLS_URFE | URLS_URPE); |
| 449 | if (termios->c_iflag & IGNBRK) { |
| 450 | port->ignore_status_mask |= URLS_URBI; |
| 451 | /* |
| 452 | * If we're ignoring parity and break indicators, |
| 453 | * ignore overruns too (for real raw support). |
| 454 | */ |
| 455 | if (termios->c_iflag & IGNPAR) |
| 456 | port->ignore_status_mask |= URLS_URROE; |
| 457 | } |
| 458 | |
| 459 | /* |
| 460 | * Ignore all characters if CREAD is not set. |
| 461 | */ |
| 462 | if ((termios->c_cflag & CREAD) == 0) |
| 463 | port->ignore_status_mask |= UART_DUMMY_LSR_RX; |
| 464 | |
| 465 | /* first, disable everything */ |
| 466 | if (UART_ENABLE_MS(port, termios->c_cflag)) |
| 467 | ks8695uart_enable_ms(port); |
| 468 | else |
| 469 | ks8695uart_disable_ms(port); |
| 470 | |
| 471 | /* Set baud rate */ |
| 472 | UART_PUT_BRDR(port, quot); |
| 473 | |
| 474 | UART_PUT_LCR(port, lcr); |
| 475 | UART_PUT_FCR(port, fcr); |
| 476 | |
| 477 | spin_unlock_irqrestore(&port->lock, flags); |
| 478 | } |
| 479 | |
| 480 | static const char *ks8695uart_type(struct uart_port *port) |
| 481 | { |
| 482 | return port->type == PORT_KS8695 ? "KS8695" : NULL; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Release the memory region(s) being used by 'port' |
| 487 | */ |
| 488 | static void ks8695uart_release_port(struct uart_port *port) |
| 489 | { |
| 490 | release_mem_region(port->mapbase, UART_PORT_SIZE); |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Request the memory region(s) being used by 'port' |
| 495 | */ |
| 496 | static int ks8695uart_request_port(struct uart_port *port) |
| 497 | { |
| 498 | return request_mem_region(port->mapbase, UART_PORT_SIZE, |
| 499 | "serial_ks8695") != NULL ? 0 : -EBUSY; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Configure/autoconfigure the port. |
| 504 | */ |
| 505 | static void ks8695uart_config_port(struct uart_port *port, int flags) |
| 506 | { |
| 507 | if (flags & UART_CONFIG_TYPE) { |
| 508 | port->type = PORT_KS8695; |
| 509 | ks8695uart_request_port(port); |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * verify the new serial_struct (for TIOCSSERIAL). |
| 515 | */ |
| 516 | static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 517 | { |
| 518 | int ret = 0; |
| 519 | |
| 520 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695) |
| 521 | ret = -EINVAL; |
| 522 | if (ser->irq != port->irq) |
| 523 | ret = -EINVAL; |
| 524 | if (ser->baud_base < 9600) |
| 525 | ret = -EINVAL; |
| 526 | return ret; |
| 527 | } |
| 528 | |
| 529 | static struct uart_ops ks8695uart_pops = { |
| 530 | .tx_empty = ks8695uart_tx_empty, |
| 531 | .set_mctrl = ks8695uart_set_mctrl, |
| 532 | .get_mctrl = ks8695uart_get_mctrl, |
| 533 | .stop_tx = ks8695uart_stop_tx, |
| 534 | .start_tx = ks8695uart_start_tx, |
| 535 | .stop_rx = ks8695uart_stop_rx, |
| 536 | .enable_ms = ks8695uart_enable_ms, |
| 537 | .break_ctl = ks8695uart_break_ctl, |
| 538 | .startup = ks8695uart_startup, |
| 539 | .shutdown = ks8695uart_shutdown, |
| 540 | .set_termios = ks8695uart_set_termios, |
| 541 | .type = ks8695uart_type, |
| 542 | .release_port = ks8695uart_release_port, |
| 543 | .request_port = ks8695uart_request_port, |
| 544 | .config_port = ks8695uart_config_port, |
| 545 | .verify_port = ks8695uart_verify_port, |
| 546 | }; |
| 547 | |
| 548 | static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = { |
| 549 | { |
Arnd Bergmann | d19bd83 | 2012-09-14 20:31:11 +0000 | [diff] [blame] | 550 | .membase = KS8695_UART_VA, |
| 551 | .mapbase = KS8695_UART_PA, |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 552 | .iotype = SERIAL_IO_MEM, |
| 553 | .irq = KS8695_IRQ_UART_TX, |
Andrew Victor | 0a51810 | 2009-08-04 19:55:56 +0100 | [diff] [blame] | 554 | .uartclk = KS8695_CLOCK_RATE * 16, |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 555 | .fifosize = 16, |
| 556 | .ops = &ks8695uart_pops, |
Peter Hurley | 35373ab | 2016-01-10 20:23:58 -0800 | [diff] [blame] | 557 | .flags = UPF_BOOT_AUTOCONF, |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 558 | .line = 0, |
| 559 | } |
| 560 | }; |
| 561 | |
| 562 | #ifdef CONFIG_SERIAL_KS8695_CONSOLE |
| 563 | static void ks8695_console_putchar(struct uart_port *port, int ch) |
| 564 | { |
| 565 | while (!(UART_GET_LSR(port) & URLS_URTHRE)) |
| 566 | barrier(); |
| 567 | |
| 568 | UART_PUT_CHAR(port, ch); |
| 569 | } |
| 570 | |
| 571 | static void ks8695_console_write(struct console *co, const char *s, u_int count) |
| 572 | { |
| 573 | struct uart_port *port = ks8695uart_ports + co->index; |
| 574 | |
| 575 | uart_console_write(port, s, count, ks8695_console_putchar); |
| 576 | } |
| 577 | |
| 578 | static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) |
| 579 | { |
| 580 | unsigned int lcr; |
| 581 | |
| 582 | lcr = UART_GET_LCR(port); |
| 583 | |
| 584 | switch (lcr & URLC_PARITY) { |
| 585 | case URPE_ODD: |
| 586 | *parity = 'o'; |
| 587 | break; |
| 588 | case URPE_EVEN: |
| 589 | *parity = 'e'; |
| 590 | break; |
| 591 | default: |
| 592 | *parity = 'n'; |
| 593 | } |
| 594 | |
| 595 | switch (lcr & URLC_URCL) { |
| 596 | case URCL_5: |
| 597 | *bits = 5; |
| 598 | break; |
| 599 | case URCL_6: |
| 600 | *bits = 6; |
| 601 | break; |
| 602 | case URCL_7: |
| 603 | *bits = 7; |
| 604 | break; |
| 605 | default: |
| 606 | *bits = 8; |
| 607 | } |
| 608 | |
| 609 | *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF); |
| 610 | *baud /= 16; |
| 611 | *baud &= 0xFFFFFFF0; |
| 612 | } |
| 613 | |
| 614 | static int __init ks8695_console_setup(struct console *co, char *options) |
| 615 | { |
| 616 | struct uart_port *port; |
| 617 | int baud = 115200; |
| 618 | int bits = 8; |
| 619 | int parity = 'n'; |
| 620 | int flow = 'n'; |
| 621 | |
| 622 | /* |
| 623 | * Check whether an invalid uart number has been specified, and |
| 624 | * if so, search for the first available port that does have |
| 625 | * console support. |
| 626 | */ |
| 627 | port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co); |
| 628 | |
| 629 | if (options) |
| 630 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 631 | else |
| 632 | ks8695_console_get_options(port, &baud, &parity, &bits); |
| 633 | |
| 634 | return uart_set_options(port, co, baud, parity, bits, flow); |
| 635 | } |
| 636 | |
Andrew Victor | 486cab2 | 2007-05-28 10:47:19 +0100 | [diff] [blame] | 637 | static struct uart_driver ks8695_reg; |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 638 | |
| 639 | static struct console ks8695_console = { |
| 640 | .name = SERIAL_KS8695_DEVNAME, |
| 641 | .write = ks8695_console_write, |
| 642 | .device = uart_console_device, |
| 643 | .setup = ks8695_console_setup, |
| 644 | .flags = CON_PRINTBUFFER, |
| 645 | .index = -1, |
| 646 | .data = &ks8695_reg, |
| 647 | }; |
| 648 | |
| 649 | static int __init ks8695_console_init(void) |
| 650 | { |
Yegor Yefremov | 0ad70740 | 2010-04-07 09:34:56 +0100 | [diff] [blame] | 651 | add_preferred_console(SERIAL_KS8695_DEVNAME, 0, NULL); |
Andrew Victor | 2c7ee6a | 2007-05-11 21:37:25 +0100 | [diff] [blame] | 652 | register_console(&ks8695_console); |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | console_initcall(ks8695_console_init); |
| 657 | |
| 658 | #define KS8695_CONSOLE &ks8695_console |
| 659 | #else |
| 660 | #define KS8695_CONSOLE NULL |
| 661 | #endif |
| 662 | |
| 663 | static struct uart_driver ks8695_reg = { |
| 664 | .owner = THIS_MODULE, |
| 665 | .driver_name = "serial_ks8695", |
| 666 | .dev_name = SERIAL_KS8695_DEVNAME, |
| 667 | .major = SERIAL_KS8695_MAJOR, |
| 668 | .minor = SERIAL_KS8695_MINOR, |
| 669 | .nr = SERIAL_KS8695_NR, |
| 670 | .cons = KS8695_CONSOLE, |
| 671 | }; |
| 672 | |
| 673 | static int __init ks8695uart_init(void) |
| 674 | { |
| 675 | int i, ret; |
| 676 | |
| 677 | printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n"); |
| 678 | |
| 679 | ret = uart_register_driver(&ks8695_reg); |
| 680 | if (ret) |
| 681 | return ret; |
| 682 | |
| 683 | for (i = 0; i < SERIAL_KS8695_NR; i++) |
| 684 | uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]); |
| 685 | |
| 686 | return 0; |
| 687 | } |
| 688 | |
| 689 | static void __exit ks8695uart_exit(void) |
| 690 | { |
| 691 | int i; |
| 692 | |
| 693 | for (i = 0; i < SERIAL_KS8695_NR; i++) |
| 694 | uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]); |
| 695 | uart_unregister_driver(&ks8695_reg); |
| 696 | } |
| 697 | |
| 698 | module_init(ks8695uart_init); |
| 699 | module_exit(ks8695uart_exit); |
| 700 | |
| 701 | MODULE_DESCRIPTION("KS8695 serial port driver"); |
| 702 | MODULE_AUTHOR("Micrel Inc."); |
| 703 | MODULE_LICENSE("GPL"); |