1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * High Speed Serial Ports on NXP LPC32xx SoC
4 *
5 * Authors: Kevin Wells <kevin.wells@nxp.com>
6 * Roland Stigge <stigge@antcom.de>
7 *
8 * Copyright (C) 2010 NXP Semiconductors
9 * Copyright (C) 2012 Roland Stigge
10 */
11
12 #include <linux/module.h>
13 #include <linux/ioport.h>
14 #include <linux/init.h>
15 #include <linux/console.h>
16 #include <linux/sysrq.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/serial_core.h>
20 #include <linux/serial.h>
21 #include <linux/platform_device.h>
22 #include <linux/delay.h>
23 #include <linux/nmi.h>
24 #include <linux/io.h>
25 #include <linux/irq.h>
26 #include <linux/of.h>
27 #include <linux/sizes.h>
28 #include <linux/soc/nxp/lpc32xx-misc.h>
29
30 /*
31 * High Speed UART register offsets
32 */
33 #define LPC32XX_HSUART_FIFO(x) ((x) + 0x00)
34 #define LPC32XX_HSUART_LEVEL(x) ((x) + 0x04)
35 #define LPC32XX_HSUART_IIR(x) ((x) + 0x08)
36 #define LPC32XX_HSUART_CTRL(x) ((x) + 0x0C)
37 #define LPC32XX_HSUART_RATE(x) ((x) + 0x10)
38
39 #define LPC32XX_HSU_BREAK_DATA (1 << 10)
40 #define LPC32XX_HSU_ERROR_DATA (1 << 9)
41 #define LPC32XX_HSU_RX_EMPTY (1 << 8)
42
43 #define LPC32XX_HSU_TX_LEV(n) (((n) >> 8) & 0xFF)
44 #define LPC32XX_HSU_RX_LEV(n) ((n) & 0xFF)
45
46 #define LPC32XX_HSU_TX_INT_SET (1 << 6)
47 #define LPC32XX_HSU_RX_OE_INT (1 << 5)
48 #define LPC32XX_HSU_BRK_INT (1 << 4)
49 #define LPC32XX_HSU_FE_INT (1 << 3)
50 #define LPC32XX_HSU_RX_TIMEOUT_INT (1 << 2)
51 #define LPC32XX_HSU_RX_TRIG_INT (1 << 1)
52 #define LPC32XX_HSU_TX_INT (1 << 0)
53
54 #define LPC32XX_HSU_HRTS_INV (1 << 21)
55 #define LPC32XX_HSU_HRTS_TRIG_8B (0x0 << 19)
56 #define LPC32XX_HSU_HRTS_TRIG_16B (0x1 << 19)
57 #define LPC32XX_HSU_HRTS_TRIG_32B (0x2 << 19)
58 #define LPC32XX_HSU_HRTS_TRIG_48B (0x3 << 19)
59 #define LPC32XX_HSU_HRTS_EN (1 << 18)
60 #define LPC32XX_HSU_TMO_DISABLED (0x0 << 16)
61 #define LPC32XX_HSU_TMO_INACT_4B (0x1 << 16)
62 #define LPC32XX_HSU_TMO_INACT_8B (0x2 << 16)
63 #define LPC32XX_HSU_TMO_INACT_16B (0x3 << 16)
64 #define LPC32XX_HSU_HCTS_INV (1 << 15)
65 #define LPC32XX_HSU_HCTS_EN (1 << 14)
66 #define LPC32XX_HSU_OFFSET(n) ((n) << 9)
67 #define LPC32XX_HSU_BREAK (1 << 8)
68 #define LPC32XX_HSU_ERR_INT_EN (1 << 7)
69 #define LPC32XX_HSU_RX_INT_EN (1 << 6)
70 #define LPC32XX_HSU_TX_INT_EN (1 << 5)
71 #define LPC32XX_HSU_RX_TL1B (0x0 << 2)
72 #define LPC32XX_HSU_RX_TL4B (0x1 << 2)
73 #define LPC32XX_HSU_RX_TL8B (0x2 << 2)
74 #define LPC32XX_HSU_RX_TL16B (0x3 << 2)
75 #define LPC32XX_HSU_RX_TL32B (0x4 << 2)
76 #define LPC32XX_HSU_RX_TL48B (0x5 << 2)
77 #define LPC32XX_HSU_TX_TLEMPTY (0x0 << 0)
78 #define LPC32XX_HSU_TX_TL0B (0x0 << 0)
79 #define LPC32XX_HSU_TX_TL4B (0x1 << 0)
80 #define LPC32XX_HSU_TX_TL8B (0x2 << 0)
81 #define LPC32XX_HSU_TX_TL16B (0x3 << 0)
82
83 #define LPC32XX_MAIN_OSC_FREQ 13000000
84
85 #define MODNAME "lpc32xx_hsuart"
86
87 struct lpc32xx_hsuart_port {
88 struct uart_port port;
89 };
90
91 #define FIFO_READ_LIMIT 128
92 #define MAX_PORTS 3
93 #define LPC32XX_TTY_NAME "ttyTX"
94 static struct lpc32xx_hsuart_port lpc32xx_hs_ports[MAX_PORTS];
95
96 #ifdef CONFIG_SERIAL_HS_LPC32XX_CONSOLE
wait_for_xmit_empty(struct uart_port * port)97 static void wait_for_xmit_empty(struct uart_port *port)
98 {
99 unsigned int timeout = 10000;
100
101 do {
102 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
103 port->membase))) == 0)
104 break;
105 if (--timeout == 0)
106 break;
107 udelay(1);
108 } while (1);
109 }
110
wait_for_xmit_ready(struct uart_port * port)111 static void wait_for_xmit_ready(struct uart_port *port)
112 {
113 unsigned int timeout = 10000;
114
115 while (1) {
116 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
117 port->membase))) < 32)
118 break;
119 if (--timeout == 0)
120 break;
121 udelay(1);
122 }
123 }
124
lpc32xx_hsuart_console_putchar(struct uart_port * port,int ch)125 static void lpc32xx_hsuart_console_putchar(struct uart_port *port, int ch)
126 {
127 wait_for_xmit_ready(port);
128 writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase));
129 }
130
lpc32xx_hsuart_console_write(struct console * co,const char * s,unsigned int count)131 static void lpc32xx_hsuart_console_write(struct console *co, const char *s,
132 unsigned int count)
133 {
134 struct lpc32xx_hsuart_port *up = &lpc32xx_hs_ports[co->index];
135 unsigned long flags;
136 int locked = 1;
137
138 touch_nmi_watchdog();
139 local_irq_save(flags);
140 if (up->port.sysrq)
141 locked = 0;
142 else if (oops_in_progress)
143 locked = spin_trylock(&up->port.lock);
144 else
145 spin_lock(&up->port.lock);
146
147 uart_console_write(&up->port, s, count, lpc32xx_hsuart_console_putchar);
148 wait_for_xmit_empty(&up->port);
149
150 if (locked)
151 spin_unlock(&up->port.lock);
152 local_irq_restore(flags);
153 }
154
lpc32xx_hsuart_console_setup(struct console * co,char * options)155 static int __init lpc32xx_hsuart_console_setup(struct console *co,
156 char *options)
157 {
158 struct uart_port *port;
159 int baud = 115200;
160 int bits = 8;
161 int parity = 'n';
162 int flow = 'n';
163
164 if (co->index >= MAX_PORTS)
165 co->index = 0;
166
167 port = &lpc32xx_hs_ports[co->index].port;
168 if (!port->membase)
169 return -ENODEV;
170
171 if (options)
172 uart_parse_options(options, &baud, &parity, &bits, &flow);
173
174 lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
175
176 return uart_set_options(port, co, baud, parity, bits, flow);
177 }
178
179 static struct uart_driver lpc32xx_hsuart_reg;
180 static struct console lpc32xx_hsuart_console = {
181 .name = LPC32XX_TTY_NAME,
182 .write = lpc32xx_hsuart_console_write,
183 .device = uart_console_device,
184 .setup = lpc32xx_hsuart_console_setup,
185 .flags = CON_PRINTBUFFER,
186 .index = -1,
187 .data = &lpc32xx_hsuart_reg,
188 };
189
lpc32xx_hsuart_console_init(void)190 static int __init lpc32xx_hsuart_console_init(void)
191 {
192 register_console(&lpc32xx_hsuart_console);
193 return 0;
194 }
195 console_initcall(lpc32xx_hsuart_console_init);
196
197 #define LPC32XX_HSUART_CONSOLE (&lpc32xx_hsuart_console)
198 #else
199 #define LPC32XX_HSUART_CONSOLE NULL
200 #endif
201
202 static struct uart_driver lpc32xx_hs_reg = {
203 .owner = THIS_MODULE,
204 .driver_name = MODNAME,
205 .dev_name = LPC32XX_TTY_NAME,
206 .nr = MAX_PORTS,
207 .cons = LPC32XX_HSUART_CONSOLE,
208 };
209 static int uarts_registered;
210
__serial_get_clock_div(unsigned long uartclk,unsigned long rate)211 static unsigned int __serial_get_clock_div(unsigned long uartclk,
212 unsigned long rate)
213 {
214 u32 div, goodrate, hsu_rate, l_hsu_rate, comprate;
215 u32 rate_diff;
216
217 /* Find the closest divider to get the desired clock rate */
218 div = uartclk / rate;
219 goodrate = hsu_rate = (div / 14) - 1;
220 if (hsu_rate != 0)
221 hsu_rate--;
222
223 /* Tweak divider */
224 l_hsu_rate = hsu_rate + 3;
225 rate_diff = 0xFFFFFFFF;
226
227 while (hsu_rate < l_hsu_rate) {
228 comprate = uartclk / ((hsu_rate + 1) * 14);
229 if (abs(comprate - rate) < rate_diff) {
230 goodrate = hsu_rate;
231 rate_diff = abs(comprate - rate);
232 }
233
234 hsu_rate++;
235 }
236 if (hsu_rate > 0xFF)
237 hsu_rate = 0xFF;
238
239 return goodrate;
240 }
241
__serial_uart_flush(struct uart_port * port)242 static void __serial_uart_flush(struct uart_port *port)
243 {
244 u32 tmp;
245 int cnt = 0;
246
247 while ((readl(LPC32XX_HSUART_LEVEL(port->membase)) > 0) &&
248 (cnt++ < FIFO_READ_LIMIT))
249 tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
250 }
251
__serial_lpc32xx_rx(struct uart_port * port)252 static void __serial_lpc32xx_rx(struct uart_port *port)
253 {
254 struct tty_port *tport = &port->state->port;
255 unsigned int tmp, flag;
256
257 /* Read data from FIFO and push into terminal */
258 tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
259 while (!(tmp & LPC32XX_HSU_RX_EMPTY)) {
260 flag = TTY_NORMAL;
261 port->icount.rx++;
262
263 if (tmp & LPC32XX_HSU_ERROR_DATA) {
264 /* Framing error */
265 writel(LPC32XX_HSU_FE_INT,
266 LPC32XX_HSUART_IIR(port->membase));
267 port->icount.frame++;
268 flag = TTY_FRAME;
269 tty_insert_flip_char(tport, 0, TTY_FRAME);
270 }
271
272 tty_insert_flip_char(tport, (tmp & 0xFF), flag);
273
274 tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
275 }
276
277 spin_unlock(&port->lock);
278 tty_flip_buffer_push(tport);
279 spin_lock(&port->lock);
280 }
281
__serial_lpc32xx_tx(struct uart_port * port)282 static void __serial_lpc32xx_tx(struct uart_port *port)
283 {
284 struct circ_buf *xmit = &port->state->xmit;
285 unsigned int tmp;
286
287 if (port->x_char) {
288 writel((u32)port->x_char, LPC32XX_HSUART_FIFO(port->membase));
289 port->icount.tx++;
290 port->x_char = 0;
291 return;
292 }
293
294 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
295 goto exit_tx;
296
297 /* Transfer data */
298 while (LPC32XX_HSU_TX_LEV(readl(
299 LPC32XX_HSUART_LEVEL(port->membase))) < 64) {
300 writel((u32) xmit->buf[xmit->tail],
301 LPC32XX_HSUART_FIFO(port->membase));
302 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
303 port->icount.tx++;
304 if (uart_circ_empty(xmit))
305 break;
306 }
307
308 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
309 uart_write_wakeup(port);
310
311 exit_tx:
312 if (uart_circ_empty(xmit)) {
313 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
314 tmp &= ~LPC32XX_HSU_TX_INT_EN;
315 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
316 }
317 }
318
serial_lpc32xx_interrupt(int irq,void * dev_id)319 static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
320 {
321 struct uart_port *port = dev_id;
322 struct tty_port *tport = &port->state->port;
323 u32 status;
324
325 spin_lock(&port->lock);
326
327 /* Read UART status and clear latched interrupts */
328 status = readl(LPC32XX_HSUART_IIR(port->membase));
329
330 if (status & LPC32XX_HSU_BRK_INT) {
331 /* Break received */
332 writel(LPC32XX_HSU_BRK_INT, LPC32XX_HSUART_IIR(port->membase));
333 port->icount.brk++;
334 uart_handle_break(port);
335 }
336
337 /* Framing error */
338 if (status & LPC32XX_HSU_FE_INT)
339 writel(LPC32XX_HSU_FE_INT, LPC32XX_HSUART_IIR(port->membase));
340
341 if (status & LPC32XX_HSU_RX_OE_INT) {
342 /* Receive FIFO overrun */
343 writel(LPC32XX_HSU_RX_OE_INT,
344 LPC32XX_HSUART_IIR(port->membase));
345 port->icount.overrun++;
346 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
347 tty_flip_buffer_push(tport);
348 }
349
350 /* Data received? */
351 if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT))
352 __serial_lpc32xx_rx(port);
353
354 /* Transmit data request? */
355 if ((status & LPC32XX_HSU_TX_INT) && (!uart_tx_stopped(port))) {
356 writel(LPC32XX_HSU_TX_INT, LPC32XX_HSUART_IIR(port->membase));
357 __serial_lpc32xx_tx(port);
358 }
359
360 spin_unlock(&port->lock);
361
362 return IRQ_HANDLED;
363 }
364
365 /* port->lock is not held. */
serial_lpc32xx_tx_empty(struct uart_port * port)366 static unsigned int serial_lpc32xx_tx_empty(struct uart_port *port)
367 {
368 unsigned int ret = 0;
369
370 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(port->membase))) == 0)
371 ret = TIOCSER_TEMT;
372
373 return ret;
374 }
375
376 /* port->lock held by caller. */
serial_lpc32xx_set_mctrl(struct uart_port * port,unsigned int mctrl)377 static void serial_lpc32xx_set_mctrl(struct uart_port *port,
378 unsigned int mctrl)
379 {
380 /* No signals are supported on HS UARTs */
381 }
382
383 /* port->lock is held by caller and interrupts are disabled. */
serial_lpc32xx_get_mctrl(struct uart_port * port)384 static unsigned int serial_lpc32xx_get_mctrl(struct uart_port *port)
385 {
386 /* No signals are supported on HS UARTs */
387 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
388 }
389
390 /* port->lock held by caller. */
serial_lpc32xx_stop_tx(struct uart_port * port)391 static void serial_lpc32xx_stop_tx(struct uart_port *port)
392 {
393 u32 tmp;
394
395 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
396 tmp &= ~LPC32XX_HSU_TX_INT_EN;
397 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
398 }
399
400 /* port->lock held by caller. */
serial_lpc32xx_start_tx(struct uart_port * port)401 static void serial_lpc32xx_start_tx(struct uart_port *port)
402 {
403 u32 tmp;
404
405 __serial_lpc32xx_tx(port);
406 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
407 tmp |= LPC32XX_HSU_TX_INT_EN;
408 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
409 }
410
411 /* port->lock held by caller. */
serial_lpc32xx_stop_rx(struct uart_port * port)412 static void serial_lpc32xx_stop_rx(struct uart_port *port)
413 {
414 u32 tmp;
415
416 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
417 tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
418 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
419
420 writel((LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT |
421 LPC32XX_HSU_FE_INT), LPC32XX_HSUART_IIR(port->membase));
422 }
423
424 /* port->lock is not held. */
serial_lpc32xx_break_ctl(struct uart_port * port,int break_state)425 static void serial_lpc32xx_break_ctl(struct uart_port *port,
426 int break_state)
427 {
428 unsigned long flags;
429 u32 tmp;
430
431 spin_lock_irqsave(&port->lock, flags);
432 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
433 if (break_state != 0)
434 tmp |= LPC32XX_HSU_BREAK;
435 else
436 tmp &= ~LPC32XX_HSU_BREAK;
437 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
438 spin_unlock_irqrestore(&port->lock, flags);
439 }
440
441 /* port->lock is not held. */
serial_lpc32xx_startup(struct uart_port * port)442 static int serial_lpc32xx_startup(struct uart_port *port)
443 {
444 int retval;
445 unsigned long flags;
446 u32 tmp;
447
448 spin_lock_irqsave(&port->lock, flags);
449
450 __serial_uart_flush(port);
451
452 writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
453 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
454 LPC32XX_HSUART_IIR(port->membase));
455
456 writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
457
458 /*
459 * Set receiver timeout, HSU offset of 20, no break, no interrupts,
460 * and default FIFO trigger levels
461 */
462 tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
463 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
464 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
465
466 lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
467
468 spin_unlock_irqrestore(&port->lock, flags);
469
470 retval = request_irq(port->irq, serial_lpc32xx_interrupt,
471 0, MODNAME, port);
472 if (!retval)
473 writel((tmp | LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN),
474 LPC32XX_HSUART_CTRL(port->membase));
475
476 return retval;
477 }
478
479 /* port->lock is not held. */
serial_lpc32xx_shutdown(struct uart_port * port)480 static void serial_lpc32xx_shutdown(struct uart_port *port)
481 {
482 u32 tmp;
483 unsigned long flags;
484
485 spin_lock_irqsave(&port->lock, flags);
486
487 tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
488 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
489 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
490
491 lpc32xx_loopback_set(port->mapbase, 1); /* go to loopback mode */
492
493 spin_unlock_irqrestore(&port->lock, flags);
494
495 free_irq(port->irq, port);
496 }
497
498 /* port->lock is not held. */
serial_lpc32xx_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)499 static void serial_lpc32xx_set_termios(struct uart_port *port,
500 struct ktermios *termios,
501 struct ktermios *old)
502 {
503 unsigned long flags;
504 unsigned int baud, quot;
505 u32 tmp;
506
507 /* Always 8-bit, no parity, 1 stop bit */
508 termios->c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD);
509 termios->c_cflag |= CS8;
510
511 termios->c_cflag &= ~(HUPCL | CMSPAR | CLOCAL | CRTSCTS);
512
513 baud = uart_get_baud_rate(port, termios, old, 0,
514 port->uartclk / 14);
515
516 quot = __serial_get_clock_div(port->uartclk, baud);
517
518 spin_lock_irqsave(&port->lock, flags);
519
520 /* Ignore characters? */
521 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
522 if ((termios->c_cflag & CREAD) == 0)
523 tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
524 else
525 tmp |= LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN;
526 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
527
528 writel(quot, LPC32XX_HSUART_RATE(port->membase));
529
530 uart_update_timeout(port, termios->c_cflag, baud);
531
532 spin_unlock_irqrestore(&port->lock, flags);
533
534 /* Don't rewrite B0 */
535 if (tty_termios_baud_rate(termios))
536 tty_termios_encode_baud_rate(termios, baud, baud);
537 }
538
serial_lpc32xx_type(struct uart_port * port)539 static const char *serial_lpc32xx_type(struct uart_port *port)
540 {
541 return MODNAME;
542 }
543
serial_lpc32xx_release_port(struct uart_port * port)544 static void serial_lpc32xx_release_port(struct uart_port *port)
545 {
546 if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
547 if (port->flags & UPF_IOREMAP) {
548 iounmap(port->membase);
549 port->membase = NULL;
550 }
551
552 release_mem_region(port->mapbase, SZ_4K);
553 }
554 }
555
serial_lpc32xx_request_port(struct uart_port * port)556 static int serial_lpc32xx_request_port(struct uart_port *port)
557 {
558 int ret = -ENODEV;
559
560 if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
561 ret = 0;
562
563 if (!request_mem_region(port->mapbase, SZ_4K, MODNAME))
564 ret = -EBUSY;
565 else if (port->flags & UPF_IOREMAP) {
566 port->membase = ioremap(port->mapbase, SZ_4K);
567 if (!port->membase) {
568 release_mem_region(port->mapbase, SZ_4K);
569 ret = -ENOMEM;
570 }
571 }
572 }
573
574 return ret;
575 }
576
serial_lpc32xx_config_port(struct uart_port * port,int uflags)577 static void serial_lpc32xx_config_port(struct uart_port *port, int uflags)
578 {
579 int ret;
580
581 ret = serial_lpc32xx_request_port(port);
582 if (ret < 0)
583 return;
584 port->type = PORT_UART00;
585 port->fifosize = 64;
586
587 __serial_uart_flush(port);
588
589 writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
590 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
591 LPC32XX_HSUART_IIR(port->membase));
592
593 writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
594
595 /* Set receiver timeout, HSU offset of 20, no break, no interrupts,
596 and default FIFO trigger levels */
597 writel(LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
598 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B,
599 LPC32XX_HSUART_CTRL(port->membase));
600 }
601
serial_lpc32xx_verify_port(struct uart_port * port,struct serial_struct * ser)602 static int serial_lpc32xx_verify_port(struct uart_port *port,
603 struct serial_struct *ser)
604 {
605 int ret = 0;
606
607 if (ser->type != PORT_UART00)
608 ret = -EINVAL;
609
610 return ret;
611 }
612
613 static const struct uart_ops serial_lpc32xx_pops = {
614 .tx_empty = serial_lpc32xx_tx_empty,
615 .set_mctrl = serial_lpc32xx_set_mctrl,
616 .get_mctrl = serial_lpc32xx_get_mctrl,
617 .stop_tx = serial_lpc32xx_stop_tx,
618 .start_tx = serial_lpc32xx_start_tx,
619 .stop_rx = serial_lpc32xx_stop_rx,
620 .break_ctl = serial_lpc32xx_break_ctl,
621 .startup = serial_lpc32xx_startup,
622 .shutdown = serial_lpc32xx_shutdown,
623 .set_termios = serial_lpc32xx_set_termios,
624 .type = serial_lpc32xx_type,
625 .release_port = serial_lpc32xx_release_port,
626 .request_port = serial_lpc32xx_request_port,
627 .config_port = serial_lpc32xx_config_port,
628 .verify_port = serial_lpc32xx_verify_port,
629 };
630
631 /*
632 * Register a set of serial devices attached to a platform device
633 */
serial_hs_lpc32xx_probe(struct platform_device * pdev)634 static int serial_hs_lpc32xx_probe(struct platform_device *pdev)
635 {
636 struct lpc32xx_hsuart_port *p = &lpc32xx_hs_ports[uarts_registered];
637 int ret = 0;
638 struct resource *res;
639
640 if (uarts_registered >= MAX_PORTS) {
641 dev_err(&pdev->dev,
642 "Error: Number of possible ports exceeded (%d)!\n",
643 uarts_registered + 1);
644 return -ENXIO;
645 }
646
647 memset(p, 0, sizeof(*p));
648
649 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
650 if (!res) {
651 dev_err(&pdev->dev,
652 "Error getting mem resource for HS UART port %d\n",
653 uarts_registered);
654 return -ENXIO;
655 }
656 p->port.mapbase = res->start;
657 p->port.membase = NULL;
658
659 ret = platform_get_irq(pdev, 0);
660 if (ret < 0)
661 return ret;
662 p->port.irq = ret;
663
664 p->port.iotype = UPIO_MEM32;
665 p->port.uartclk = LPC32XX_MAIN_OSC_FREQ;
666 p->port.regshift = 2;
667 p->port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
668 p->port.dev = &pdev->dev;
669 p->port.ops = &serial_lpc32xx_pops;
670 p->port.line = uarts_registered++;
671 spin_lock_init(&p->port.lock);
672
673 /* send port to loopback mode by default */
674 lpc32xx_loopback_set(p->port.mapbase, 1);
675
676 ret = uart_add_one_port(&lpc32xx_hs_reg, &p->port);
677
678 platform_set_drvdata(pdev, p);
679
680 return ret;
681 }
682
683 /*
684 * Remove serial ports registered against a platform device.
685 */
serial_hs_lpc32xx_remove(struct platform_device * pdev)686 static int serial_hs_lpc32xx_remove(struct platform_device *pdev)
687 {
688 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
689
690 uart_remove_one_port(&lpc32xx_hs_reg, &p->port);
691
692 return 0;
693 }
694
695
696 #ifdef CONFIG_PM
serial_hs_lpc32xx_suspend(struct platform_device * pdev,pm_message_t state)697 static int serial_hs_lpc32xx_suspend(struct platform_device *pdev,
698 pm_message_t state)
699 {
700 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
701
702 uart_suspend_port(&lpc32xx_hs_reg, &p->port);
703
704 return 0;
705 }
706
serial_hs_lpc32xx_resume(struct platform_device * pdev)707 static int serial_hs_lpc32xx_resume(struct platform_device *pdev)
708 {
709 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
710
711 uart_resume_port(&lpc32xx_hs_reg, &p->port);
712
713 return 0;
714 }
715 #else
716 #define serial_hs_lpc32xx_suspend NULL
717 #define serial_hs_lpc32xx_resume NULL
718 #endif
719
720 static const struct of_device_id serial_hs_lpc32xx_dt_ids[] = {
721 { .compatible = "nxp,lpc3220-hsuart" },
722 { /* sentinel */ }
723 };
724
725 MODULE_DEVICE_TABLE(of, serial_hs_lpc32xx_dt_ids);
726
727 static struct platform_driver serial_hs_lpc32xx_driver = {
728 .probe = serial_hs_lpc32xx_probe,
729 .remove = serial_hs_lpc32xx_remove,
730 .suspend = serial_hs_lpc32xx_suspend,
731 .resume = serial_hs_lpc32xx_resume,
732 .driver = {
733 .name = MODNAME,
734 .of_match_table = serial_hs_lpc32xx_dt_ids,
735 },
736 };
737
lpc32xx_hsuart_init(void)738 static int __init lpc32xx_hsuart_init(void)
739 {
740 int ret;
741
742 ret = uart_register_driver(&lpc32xx_hs_reg);
743 if (ret)
744 return ret;
745
746 ret = platform_driver_register(&serial_hs_lpc32xx_driver);
747 if (ret)
748 uart_unregister_driver(&lpc32xx_hs_reg);
749
750 return ret;
751 }
752
lpc32xx_hsuart_exit(void)753 static void __exit lpc32xx_hsuart_exit(void)
754 {
755 platform_driver_unregister(&serial_hs_lpc32xx_driver);
756 uart_unregister_driver(&lpc32xx_hs_reg);
757 }
758
759 module_init(lpc32xx_hsuart_init);
760 module_exit(lpc32xx_hsuart_exit);
761
762 MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
763 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
764 MODULE_DESCRIPTION("NXP LPC32XX High Speed UART driver");
765 MODULE_LICENSE("GPL");
766