1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Driver for GRLIB serial ports (APBUART) |
4 | * |
5 | * Based on linux/drivers/serial/amba.c |
6 | * |
7 | * Copyright (C) 2000 Deep Blue Solutions Ltd. |
8 | * Copyright (C) 2003 Konrad Eisele <eiselekd@web.de> |
9 | * Copyright (C) 2006 Daniel Hellstrom <daniel@gaisler.com>, Aeroflex Gaisler AB |
10 | * Copyright (C) 2008 Gilead Kutnick <kutnickg@zin-tech.com> |
11 | * Copyright (C) 2009 Kristoffer Glembo <kristoffer@gaisler.com>, Aeroflex Gaisler AB |
12 | */ |
13 | |
14 | #include <linux/module.h> |
15 | #include <linux/tty.h> |
16 | #include <linux/tty_flip.h> |
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/kthread.h> |
23 | #include <linux/device.h> |
24 | #include <linux/of.h> |
25 | #include <linux/platform_device.h> |
26 | #include <linux/io.h> |
27 | #include <linux/serial_core.h> |
28 | #include <asm/irq.h> |
29 | |
30 | #include "apbuart.h" |
31 | |
32 | #define SERIAL_APBUART_MAJOR TTY_MAJOR |
33 | #define SERIAL_APBUART_MINOR 64 |
34 | #define UART_DUMMY_RSR_RX 0x8000 /* for ignore all read */ |
35 | |
36 | static void apbuart_tx_chars(struct uart_port *port); |
37 | |
38 | static void apbuart_stop_tx(struct uart_port *port) |
39 | { |
40 | unsigned int cr; |
41 | |
42 | cr = UART_GET_CTRL(port); |
43 | cr &= ~UART_CTRL_TI; |
44 | UART_PUT_CTRL(port, cr); |
45 | } |
46 | |
47 | static void apbuart_start_tx(struct uart_port *port) |
48 | { |
49 | unsigned int cr; |
50 | |
51 | cr = UART_GET_CTRL(port); |
52 | cr |= UART_CTRL_TI; |
53 | UART_PUT_CTRL(port, cr); |
54 | |
55 | if (UART_GET_STATUS(port) & UART_STATUS_THE) |
56 | apbuart_tx_chars(port); |
57 | } |
58 | |
59 | static void apbuart_stop_rx(struct uart_port *port) |
60 | { |
61 | unsigned int cr; |
62 | |
63 | cr = UART_GET_CTRL(port); |
64 | cr &= ~(UART_CTRL_RI); |
65 | UART_PUT_CTRL(port, cr); |
66 | } |
67 | |
68 | static void apbuart_rx_chars(struct uart_port *port) |
69 | { |
70 | unsigned int status, rsr; |
71 | unsigned int max_chars = port->fifosize; |
72 | u8 ch, flag; |
73 | |
74 | status = UART_GET_STATUS(port); |
75 | |
76 | while (UART_RX_DATA(status) && (max_chars--)) { |
77 | |
78 | ch = UART_GET_CHAR(port); |
79 | flag = TTY_NORMAL; |
80 | |
81 | port->icount.rx++; |
82 | |
83 | rsr = UART_GET_STATUS(port) | UART_DUMMY_RSR_RX; |
84 | UART_PUT_STATUS(port, 0); |
85 | if (rsr & UART_STATUS_ERR) { |
86 | |
87 | if (rsr & UART_STATUS_BR) { |
88 | rsr &= ~(UART_STATUS_FE | UART_STATUS_PE); |
89 | port->icount.brk++; |
90 | if (uart_handle_break(port)) |
91 | goto ignore_char; |
92 | } else if (rsr & UART_STATUS_PE) { |
93 | port->icount.parity++; |
94 | } else if (rsr & UART_STATUS_FE) { |
95 | port->icount.frame++; |
96 | } |
97 | if (rsr & UART_STATUS_OE) |
98 | port->icount.overrun++; |
99 | |
100 | rsr &= port->read_status_mask; |
101 | |
102 | if (rsr & UART_STATUS_PE) |
103 | flag = TTY_PARITY; |
104 | else if (rsr & UART_STATUS_FE) |
105 | flag = TTY_FRAME; |
106 | } |
107 | |
108 | if (uart_handle_sysrq_char(port, ch)) |
109 | goto ignore_char; |
110 | |
111 | uart_insert_char(port, status: rsr, UART_STATUS_OE, ch, flag); |
112 | |
113 | |
114 | ignore_char: |
115 | status = UART_GET_STATUS(port); |
116 | } |
117 | |
118 | tty_flip_buffer_push(port: &port->state->port); |
119 | } |
120 | |
121 | static void apbuart_tx_chars(struct uart_port *port) |
122 | { |
123 | u8 ch; |
124 | |
125 | uart_port_tx_limited(port, ch, port->fifosize >> 1, |
126 | true, |
127 | UART_PUT_CHAR(port, ch), |
128 | ({})); |
129 | } |
130 | |
131 | static irqreturn_t apbuart_int(int irq, void *dev_id) |
132 | { |
133 | struct uart_port *port = dev_id; |
134 | unsigned int status; |
135 | |
136 | uart_port_lock(up: port); |
137 | |
138 | status = UART_GET_STATUS(port); |
139 | if (status & UART_STATUS_DR) |
140 | apbuart_rx_chars(port); |
141 | if (status & UART_STATUS_THE) |
142 | apbuart_tx_chars(port); |
143 | |
144 | uart_port_unlock(up: port); |
145 | |
146 | return IRQ_HANDLED; |
147 | } |
148 | |
149 | static unsigned int apbuart_tx_empty(struct uart_port *port) |
150 | { |
151 | unsigned int status = UART_GET_STATUS(port); |
152 | return status & UART_STATUS_THE ? TIOCSER_TEMT : 0; |
153 | } |
154 | |
155 | static unsigned int apbuart_get_mctrl(struct uart_port *port) |
156 | { |
157 | /* The GRLIB APBUART handles flow control in hardware */ |
158 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; |
159 | } |
160 | |
161 | static void apbuart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
162 | { |
163 | /* The GRLIB APBUART handles flow control in hardware */ |
164 | } |
165 | |
166 | static void apbuart_break_ctl(struct uart_port *port, int break_state) |
167 | { |
168 | /* We don't support sending break */ |
169 | } |
170 | |
171 | static int apbuart_startup(struct uart_port *port) |
172 | { |
173 | int retval; |
174 | unsigned int cr; |
175 | |
176 | /* Allocate the IRQ */ |
177 | retval = request_irq(irq: port->irq, handler: apbuart_int, flags: 0, name: "apbuart" , dev: port); |
178 | if (retval) |
179 | return retval; |
180 | |
181 | /* Finally, enable interrupts */ |
182 | cr = UART_GET_CTRL(port); |
183 | UART_PUT_CTRL(port, |
184 | cr | UART_CTRL_RE | UART_CTRL_TE | |
185 | UART_CTRL_RI | UART_CTRL_TI); |
186 | |
187 | return 0; |
188 | } |
189 | |
190 | static void apbuart_shutdown(struct uart_port *port) |
191 | { |
192 | unsigned int cr; |
193 | |
194 | /* disable all interrupts, disable the port */ |
195 | cr = UART_GET_CTRL(port); |
196 | UART_PUT_CTRL(port, |
197 | cr & ~(UART_CTRL_RE | UART_CTRL_TE | |
198 | UART_CTRL_RI | UART_CTRL_TI)); |
199 | |
200 | /* Free the interrupt */ |
201 | free_irq(port->irq, port); |
202 | } |
203 | |
204 | static void apbuart_set_termios(struct uart_port *port, |
205 | struct ktermios *termios, const struct ktermios *old) |
206 | { |
207 | unsigned int cr; |
208 | unsigned long flags; |
209 | unsigned int baud, quot; |
210 | |
211 | /* Ask the core to calculate the divisor for us. */ |
212 | baud = uart_get_baud_rate(port, termios, old, min: 0, max: port->uartclk / 16); |
213 | if (baud == 0) |
214 | panic(fmt: "invalid baudrate %i\n" , port->uartclk / 16); |
215 | |
216 | /* uart_get_divisor calc a *16 uart freq, apbuart is *8 */ |
217 | quot = (uart_get_divisor(port, baud)) * 2; |
218 | cr = UART_GET_CTRL(port); |
219 | cr &= ~(UART_CTRL_PE | UART_CTRL_PS); |
220 | |
221 | if (termios->c_cflag & PARENB) { |
222 | cr |= UART_CTRL_PE; |
223 | if ((termios->c_cflag & PARODD)) |
224 | cr |= UART_CTRL_PS; |
225 | } |
226 | |
227 | /* Enable flow control. */ |
228 | if (termios->c_cflag & CRTSCTS) |
229 | cr |= UART_CTRL_FL; |
230 | |
231 | uart_port_lock_irqsave(up: port, flags: &flags); |
232 | |
233 | /* Update the per-port timeout. */ |
234 | uart_update_timeout(port, cflag: termios->c_cflag, baud); |
235 | |
236 | port->read_status_mask = UART_STATUS_OE; |
237 | if (termios->c_iflag & INPCK) |
238 | port->read_status_mask |= UART_STATUS_FE | UART_STATUS_PE; |
239 | |
240 | /* Characters to ignore */ |
241 | port->ignore_status_mask = 0; |
242 | if (termios->c_iflag & IGNPAR) |
243 | port->ignore_status_mask |= UART_STATUS_FE | UART_STATUS_PE; |
244 | |
245 | /* Ignore all characters if CREAD is not set. */ |
246 | if ((termios->c_cflag & CREAD) == 0) |
247 | port->ignore_status_mask |= UART_DUMMY_RSR_RX; |
248 | |
249 | /* Set baud rate */ |
250 | quot -= 1; |
251 | UART_PUT_SCAL(port, quot); |
252 | UART_PUT_CTRL(port, cr); |
253 | |
254 | uart_port_unlock_irqrestore(up: port, flags); |
255 | } |
256 | |
257 | static const char *apbuart_type(struct uart_port *port) |
258 | { |
259 | return port->type == PORT_APBUART ? "GRLIB/APBUART" : NULL; |
260 | } |
261 | |
262 | static void apbuart_release_port(struct uart_port *port) |
263 | { |
264 | release_mem_region(port->mapbase, 0x100); |
265 | } |
266 | |
267 | static int apbuart_request_port(struct uart_port *port) |
268 | { |
269 | return request_mem_region(port->mapbase, 0x100, "grlib-apbuart" ) |
270 | != NULL ? 0 : -EBUSY; |
271 | return 0; |
272 | } |
273 | |
274 | /* Configure/autoconfigure the port */ |
275 | static void apbuart_config_port(struct uart_port *port, int flags) |
276 | { |
277 | if (flags & UART_CONFIG_TYPE) { |
278 | port->type = PORT_APBUART; |
279 | apbuart_request_port(port); |
280 | } |
281 | } |
282 | |
283 | /* Verify the new serial_struct (for TIOCSSERIAL) */ |
284 | static int apbuart_verify_port(struct uart_port *port, |
285 | struct serial_struct *ser) |
286 | { |
287 | int ret = 0; |
288 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_APBUART) |
289 | ret = -EINVAL; |
290 | if (ser->irq < 0 || ser->irq >= NR_IRQS) |
291 | ret = -EINVAL; |
292 | if (ser->baud_base < 9600) |
293 | ret = -EINVAL; |
294 | return ret; |
295 | } |
296 | |
297 | static const struct uart_ops grlib_apbuart_ops = { |
298 | .tx_empty = apbuart_tx_empty, |
299 | .set_mctrl = apbuart_set_mctrl, |
300 | .get_mctrl = apbuart_get_mctrl, |
301 | .stop_tx = apbuart_stop_tx, |
302 | .start_tx = apbuart_start_tx, |
303 | .stop_rx = apbuart_stop_rx, |
304 | .break_ctl = apbuart_break_ctl, |
305 | .startup = apbuart_startup, |
306 | .shutdown = apbuart_shutdown, |
307 | .set_termios = apbuart_set_termios, |
308 | .type = apbuart_type, |
309 | .release_port = apbuart_release_port, |
310 | .request_port = apbuart_request_port, |
311 | .config_port = apbuart_config_port, |
312 | .verify_port = apbuart_verify_port, |
313 | }; |
314 | |
315 | static struct uart_port grlib_apbuart_ports[UART_NR]; |
316 | static struct device_node *grlib_apbuart_nodes[UART_NR]; |
317 | |
318 | static int apbuart_scan_fifo_size(struct uart_port *port, int portnumber) |
319 | { |
320 | int ctrl, loop = 0; |
321 | int status; |
322 | int fifosize; |
323 | unsigned long flags; |
324 | |
325 | ctrl = UART_GET_CTRL(port); |
326 | |
327 | /* |
328 | * Enable the transceiver and wait for it to be ready to send data. |
329 | * Clear interrupts so that this process will not be externally |
330 | * interrupted in the middle (which can cause the transceiver to |
331 | * drain prematurely). |
332 | */ |
333 | |
334 | local_irq_save(flags); |
335 | |
336 | UART_PUT_CTRL(port, ctrl | UART_CTRL_TE); |
337 | |
338 | while (!UART_TX_READY(UART_GET_STATUS(port))) |
339 | loop++; |
340 | |
341 | /* |
342 | * Disable the transceiver so data isn't actually sent during the |
343 | * actual test. |
344 | */ |
345 | |
346 | UART_PUT_CTRL(port, ctrl & ~(UART_CTRL_TE)); |
347 | |
348 | fifosize = 1; |
349 | UART_PUT_CHAR(port, 0); |
350 | |
351 | /* |
352 | * So long as transmitting a character increments the tranceivier FIFO |
353 | * length the FIFO must be at least that big. These bytes will |
354 | * automatically drain off of the FIFO. |
355 | */ |
356 | |
357 | status = UART_GET_STATUS(port); |
358 | while (((status >> 20) & 0x3F) == fifosize) { |
359 | fifosize++; |
360 | UART_PUT_CHAR(port, 0); |
361 | status = UART_GET_STATUS(port); |
362 | } |
363 | |
364 | fifosize--; |
365 | |
366 | UART_PUT_CTRL(port, ctrl); |
367 | local_irq_restore(flags); |
368 | |
369 | if (fifosize == 0) |
370 | fifosize = 1; |
371 | |
372 | return fifosize; |
373 | } |
374 | |
375 | static void apbuart_flush_fifo(struct uart_port *port) |
376 | { |
377 | int i; |
378 | |
379 | for (i = 0; i < port->fifosize; i++) |
380 | UART_GET_CHAR(port); |
381 | } |
382 | |
383 | |
384 | /* ======================================================================== */ |
385 | /* Console driver, if enabled */ |
386 | /* ======================================================================== */ |
387 | |
388 | #ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE |
389 | |
390 | static void apbuart_console_putchar(struct uart_port *port, unsigned char ch) |
391 | { |
392 | unsigned int status; |
393 | do { |
394 | status = UART_GET_STATUS(port); |
395 | } while (!UART_TX_READY(status)); |
396 | UART_PUT_CHAR(port, ch); |
397 | } |
398 | |
399 | static void |
400 | apbuart_console_write(struct console *co, const char *s, unsigned int count) |
401 | { |
402 | struct uart_port *port = &grlib_apbuart_ports[co->index]; |
403 | unsigned int status, old_cr, new_cr; |
404 | |
405 | /* First save the CR then disable the interrupts */ |
406 | old_cr = UART_GET_CTRL(port); |
407 | new_cr = old_cr & ~(UART_CTRL_RI | UART_CTRL_TI); |
408 | UART_PUT_CTRL(port, new_cr); |
409 | |
410 | uart_console_write(port, s, count, apbuart_console_putchar); |
411 | |
412 | /* |
413 | * Finally, wait for transmitter to become empty |
414 | * and restore the TCR |
415 | */ |
416 | do { |
417 | status = UART_GET_STATUS(port); |
418 | } while (!UART_TX_READY(status)); |
419 | UART_PUT_CTRL(port, old_cr); |
420 | } |
421 | |
422 | static void __init |
423 | apbuart_console_get_options(struct uart_port *port, int *baud, |
424 | int *parity, int *bits) |
425 | { |
426 | if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) { |
427 | |
428 | unsigned int quot, status; |
429 | status = UART_GET_STATUS(port); |
430 | |
431 | *parity = 'n'; |
432 | if (status & UART_CTRL_PE) { |
433 | if ((status & UART_CTRL_PS) == 0) |
434 | *parity = 'e'; |
435 | else |
436 | *parity = 'o'; |
437 | } |
438 | |
439 | *bits = 8; |
440 | quot = UART_GET_SCAL(port) / 8; |
441 | *baud = port->uartclk / (16 * (quot + 1)); |
442 | } |
443 | } |
444 | |
445 | static int __init apbuart_console_setup(struct console *co, char *options) |
446 | { |
447 | struct uart_port *port; |
448 | int baud = 38400; |
449 | int bits = 8; |
450 | int parity = 'n'; |
451 | int flow = 'n'; |
452 | |
453 | pr_debug("apbuart_console_setup co=%p, co->index=%i, options=%s\n" , |
454 | co, co->index, options); |
455 | |
456 | /* |
457 | * Check whether an invalid uart number has been specified, and |
458 | * if so, search for the first available port that does have |
459 | * console support. |
460 | */ |
461 | if (co->index >= grlib_apbuart_port_nr) |
462 | co->index = 0; |
463 | |
464 | port = &grlib_apbuart_ports[co->index]; |
465 | |
466 | spin_lock_init(&port->lock); |
467 | |
468 | if (options) |
469 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
470 | else |
471 | apbuart_console_get_options(port, &baud, &parity, &bits); |
472 | |
473 | return uart_set_options(port, co, baud, parity, bits, flow); |
474 | } |
475 | |
476 | static struct uart_driver grlib_apbuart_driver; |
477 | |
478 | static struct console grlib_apbuart_console = { |
479 | .name = "ttyS" , |
480 | .write = apbuart_console_write, |
481 | .device = uart_console_device, |
482 | .setup = apbuart_console_setup, |
483 | .flags = CON_PRINTBUFFER, |
484 | .index = -1, |
485 | .data = &grlib_apbuart_driver, |
486 | }; |
487 | |
488 | |
489 | static int grlib_apbuart_configure(void); |
490 | |
491 | static int __init apbuart_console_init(void) |
492 | { |
493 | if (grlib_apbuart_configure()) |
494 | return -ENODEV; |
495 | register_console(&grlib_apbuart_console); |
496 | return 0; |
497 | } |
498 | |
499 | console_initcall(apbuart_console_init); |
500 | |
501 | #define APBUART_CONSOLE (&grlib_apbuart_console) |
502 | #else |
503 | #define APBUART_CONSOLE NULL |
504 | #endif |
505 | |
506 | static struct uart_driver grlib_apbuart_driver = { |
507 | .owner = THIS_MODULE, |
508 | .driver_name = "serial" , |
509 | .dev_name = "ttyS" , |
510 | .major = SERIAL_APBUART_MAJOR, |
511 | .minor = SERIAL_APBUART_MINOR, |
512 | .nr = UART_NR, |
513 | .cons = APBUART_CONSOLE, |
514 | }; |
515 | |
516 | |
517 | /* ======================================================================== */ |
518 | /* OF Platform Driver */ |
519 | /* ======================================================================== */ |
520 | |
521 | static int apbuart_probe(struct platform_device *op) |
522 | { |
523 | int i; |
524 | struct uart_port *port = NULL; |
525 | |
526 | for (i = 0; i < grlib_apbuart_port_nr; i++) { |
527 | if (op->dev.of_node == grlib_apbuart_nodes[i]) |
528 | break; |
529 | } |
530 | |
531 | port = &grlib_apbuart_ports[i]; |
532 | port->dev = &op->dev; |
533 | port->irq = op->archdata.irqs[0]; |
534 | |
535 | uart_add_one_port(reg: &grlib_apbuart_driver, port: (struct uart_port *) port); |
536 | |
537 | apbuart_flush_fifo(port: (struct uart_port *) port); |
538 | |
539 | printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n" , |
540 | (unsigned long long) port->mapbase, port->irq); |
541 | return 0; |
542 | } |
543 | |
544 | static const struct of_device_id apbuart_match[] = { |
545 | { |
546 | .name = "GAISLER_APBUART" , |
547 | }, |
548 | { |
549 | .name = "01_00c" , |
550 | }, |
551 | {}, |
552 | }; |
553 | MODULE_DEVICE_TABLE(of, apbuart_match); |
554 | |
555 | static struct platform_driver grlib_apbuart_of_driver = { |
556 | .probe = apbuart_probe, |
557 | .driver = { |
558 | .name = "grlib-apbuart" , |
559 | .of_match_table = apbuart_match, |
560 | }, |
561 | }; |
562 | |
563 | |
564 | static int __init grlib_apbuart_configure(void) |
565 | { |
566 | struct device_node *np; |
567 | int line = 0; |
568 | |
569 | for_each_matching_node(np, apbuart_match) { |
570 | const int *ampopts; |
571 | const u32 *freq_hz; |
572 | const struct amba_prom_registers *regs; |
573 | struct uart_port *port; |
574 | unsigned long addr; |
575 | |
576 | ampopts = of_get_property(node: np, name: "ampopts" , NULL); |
577 | if (ampopts && (*ampopts == 0)) |
578 | continue; /* Ignore if used by another OS instance */ |
579 | regs = of_get_property(node: np, name: "reg" , NULL); |
580 | /* Frequency of APB Bus is frequency of UART */ |
581 | freq_hz = of_get_property(node: np, name: "freq" , NULL); |
582 | |
583 | if (!regs || !freq_hz || (*freq_hz == 0)) |
584 | continue; |
585 | |
586 | grlib_apbuart_nodes[line] = np; |
587 | |
588 | addr = regs->phys_addr; |
589 | |
590 | port = &grlib_apbuart_ports[line]; |
591 | |
592 | port->mapbase = addr; |
593 | port->membase = ioremap(offset: addr, size: sizeof(struct grlib_apbuart_regs_map)); |
594 | port->irq = 0; |
595 | port->iotype = UPIO_MEM; |
596 | port->ops = &grlib_apbuart_ops; |
597 | port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE); |
598 | port->flags = UPF_BOOT_AUTOCONF; |
599 | port->line = line; |
600 | port->uartclk = *freq_hz; |
601 | port->fifosize = apbuart_scan_fifo_size(port: (struct uart_port *) port, portnumber: line); |
602 | line++; |
603 | |
604 | /* We support maximum UART_NR uarts ... */ |
605 | if (line == UART_NR) |
606 | break; |
607 | } |
608 | |
609 | grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line; |
610 | return line ? 0 : -ENODEV; |
611 | } |
612 | |
613 | static int __init grlib_apbuart_init(void) |
614 | { |
615 | int ret; |
616 | |
617 | /* Find all APBUARTS in device the tree and initialize their ports */ |
618 | ret = grlib_apbuart_configure(); |
619 | if (ret) |
620 | return ret; |
621 | |
622 | printk(KERN_INFO "Serial: GRLIB APBUART driver\n" ); |
623 | |
624 | ret = uart_register_driver(uart: &grlib_apbuart_driver); |
625 | |
626 | if (ret) { |
627 | printk(KERN_ERR "%s: uart_register_driver failed (%i)\n" , |
628 | __FILE__, ret); |
629 | return ret; |
630 | } |
631 | |
632 | ret = platform_driver_register(&grlib_apbuart_of_driver); |
633 | if (ret) { |
634 | printk(KERN_ERR |
635 | "%s: platform_driver_register failed (%i)\n" , |
636 | __FILE__, ret); |
637 | uart_unregister_driver(uart: &grlib_apbuart_driver); |
638 | return ret; |
639 | } |
640 | |
641 | return ret; |
642 | } |
643 | |
644 | static void __exit grlib_apbuart_exit(void) |
645 | { |
646 | int i; |
647 | |
648 | for (i = 0; i < grlib_apbuart_port_nr; i++) |
649 | uart_remove_one_port(reg: &grlib_apbuart_driver, |
650 | port: &grlib_apbuart_ports[i]); |
651 | |
652 | uart_unregister_driver(uart: &grlib_apbuart_driver); |
653 | platform_driver_unregister(&grlib_apbuart_of_driver); |
654 | } |
655 | |
656 | module_init(grlib_apbuart_init); |
657 | module_exit(grlib_apbuart_exit); |
658 | |
659 | MODULE_AUTHOR("Aeroflex Gaisler AB" ); |
660 | MODULE_DESCRIPTION("GRLIB APBUART serial driver" ); |
661 | MODULE_VERSION("2.1" ); |
662 | MODULE_LICENSE("GPL" ); |
663 | |