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,unsigned char ch)125 static void lpc32xx_hsuart_console_putchar(struct uart_port *port, unsigned char 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 if (oops_in_progress)
140 locked = uart_port_trylock_irqsave(&up->port, &flags);
141 else
142 uart_port_lock_irqsave(&up->port, &flags);
143
144 uart_console_write(&up->port, s, count, lpc32xx_hsuart_console_putchar);
145 wait_for_xmit_empty(&up->port);
146
147 if (locked)
148 uart_port_unlock_irqrestore(&up->port, flags);
149 }
150
lpc32xx_hsuart_console_setup(struct console * co,char * options)151 static int __init lpc32xx_hsuart_console_setup(struct console *co,
152 char *options)
153 {
154 struct uart_port *port;
155 int baud = 115200;
156 int bits = 8;
157 int parity = 'n';
158 int flow = 'n';
159
160 if (co->index >= MAX_PORTS)
161 co->index = 0;
162
163 port = &lpc32xx_hs_ports[co->index].port;
164 if (!port->membase)
165 return -ENODEV;
166
167 if (options)
168 uart_parse_options(options, &baud, &parity, &bits, &flow);
169
170 lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
171
172 return uart_set_options(port, co, baud, parity, bits, flow);
173 }
174
175 static struct uart_driver lpc32xx_hsuart_reg;
176 static struct console lpc32xx_hsuart_console = {
177 .name = LPC32XX_TTY_NAME,
178 .write = lpc32xx_hsuart_console_write,
179 .device = uart_console_device,
180 .setup = lpc32xx_hsuart_console_setup,
181 .flags = CON_PRINTBUFFER,
182 .index = -1,
183 .data = &lpc32xx_hsuart_reg,
184 };
185
lpc32xx_hsuart_console_init(void)186 static int __init lpc32xx_hsuart_console_init(void)
187 {
188 register_console(&lpc32xx_hsuart_console);
189 return 0;
190 }
191 console_initcall(lpc32xx_hsuart_console_init);
192
193 #define LPC32XX_HSUART_CONSOLE (&lpc32xx_hsuart_console)
194 #else
195 #define LPC32XX_HSUART_CONSOLE NULL
196 #endif
197
198 static struct uart_driver lpc32xx_hs_reg = {
199 .owner = THIS_MODULE,
200 .driver_name = MODNAME,
201 .dev_name = LPC32XX_TTY_NAME,
202 .nr = MAX_PORTS,
203 .cons = LPC32XX_HSUART_CONSOLE,
204 };
205 static int uarts_registered;
206
__serial_get_clock_div(unsigned long uartclk,unsigned long rate)207 static unsigned int __serial_get_clock_div(unsigned long uartclk,
208 unsigned long rate)
209 {
210 u32 div, goodrate, hsu_rate, l_hsu_rate, comprate;
211 u32 rate_diff;
212
213 /* Find the closest divider to get the desired clock rate */
214 div = uartclk / rate;
215 goodrate = hsu_rate = (div / 14) - 1;
216 if (hsu_rate != 0)
217 hsu_rate--;
218
219 /* Tweak divider */
220 l_hsu_rate = hsu_rate + 3;
221 rate_diff = 0xFFFFFFFF;
222
223 while (hsu_rate < l_hsu_rate) {
224 comprate = uartclk / ((hsu_rate + 1) * 14);
225 if (abs(comprate - rate) < rate_diff) {
226 goodrate = hsu_rate;
227 rate_diff = abs(comprate - rate);
228 }
229
230 hsu_rate++;
231 }
232
233 return goodrate;
234 }
235
__serial_uart_flush(struct uart_port * port)236 static void __serial_uart_flush(struct uart_port *port)
237 {
238 int cnt = 0;
239
240 while ((readl(LPC32XX_HSUART_LEVEL(port->membase)) > 0) &&
241 (cnt++ < FIFO_READ_LIMIT))
242 readl(LPC32XX_HSUART_FIFO(port->membase));
243 }
244
__serial_lpc32xx_rx(struct uart_port * port)245 static void __serial_lpc32xx_rx(struct uart_port *port)
246 {
247 struct tty_port *tport = &port->state->port;
248 unsigned int tmp, flag;
249
250 /* Read data from FIFO and push into terminal */
251 tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
252 while (!(tmp & LPC32XX_HSU_RX_EMPTY)) {
253 flag = TTY_NORMAL;
254 port->icount.rx++;
255
256 if (tmp & LPC32XX_HSU_ERROR_DATA) {
257 /* Framing error */
258 writel(LPC32XX_HSU_FE_INT,
259 LPC32XX_HSUART_IIR(port->membase));
260 port->icount.frame++;
261 flag = TTY_FRAME;
262 tty_insert_flip_char(tport, 0, TTY_FRAME);
263 }
264
265 if (!uart_prepare_sysrq_char(port, tmp & 0xff))
266 tty_insert_flip_char(tport, (tmp & 0xFF), flag);
267
268 tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
269 }
270
271 tty_flip_buffer_push(tport);
272 }
273
serial_lpc32xx_tx_ready(struct uart_port * port)274 static bool serial_lpc32xx_tx_ready(struct uart_port *port)
275 {
276 u32 level = readl(LPC32XX_HSUART_LEVEL(port->membase));
277
278 return LPC32XX_HSU_TX_LEV(level) < 64;
279 }
280
__serial_lpc32xx_tx(struct uart_port * port)281 static void __serial_lpc32xx_tx(struct uart_port *port)
282 {
283 u8 ch;
284
285 uart_port_tx(port, ch,
286 serial_lpc32xx_tx_ready(port),
287 writel(ch, LPC32XX_HSUART_FIFO(port->membase)));
288 }
289
serial_lpc32xx_interrupt(int irq,void * dev_id)290 static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
291 {
292 struct uart_port *port = dev_id;
293 struct tty_port *tport = &port->state->port;
294 u32 status;
295
296 uart_port_lock(port);
297
298 /* Read UART status and clear latched interrupts */
299 status = readl(LPC32XX_HSUART_IIR(port->membase));
300
301 if (status & LPC32XX_HSU_BRK_INT) {
302 /* Break received */
303 writel(LPC32XX_HSU_BRK_INT, LPC32XX_HSUART_IIR(port->membase));
304 port->icount.brk++;
305 uart_handle_break(port);
306 }
307
308 /* Framing error */
309 if (status & LPC32XX_HSU_FE_INT)
310 writel(LPC32XX_HSU_FE_INT, LPC32XX_HSUART_IIR(port->membase));
311
312 if (status & LPC32XX_HSU_RX_OE_INT) {
313 /* Receive FIFO overrun */
314 writel(LPC32XX_HSU_RX_OE_INT,
315 LPC32XX_HSUART_IIR(port->membase));
316 port->icount.overrun++;
317 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
318 tty_flip_buffer_push(tport);
319 }
320
321 /* Data received? */
322 if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT))
323 __serial_lpc32xx_rx(port);
324
325 /* Transmit data request? */
326 if ((status & LPC32XX_HSU_TX_INT) && (!uart_tx_stopped(port))) {
327 writel(LPC32XX_HSU_TX_INT, LPC32XX_HSUART_IIR(port->membase));
328 __serial_lpc32xx_tx(port);
329 }
330
331 uart_unlock_and_check_sysrq(port);
332
333 return IRQ_HANDLED;
334 }
335
336 /* port->lock is not held. */
serial_lpc32xx_tx_empty(struct uart_port * port)337 static unsigned int serial_lpc32xx_tx_empty(struct uart_port *port)
338 {
339 unsigned int ret = 0;
340
341 if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(port->membase))) == 0)
342 ret = TIOCSER_TEMT;
343
344 return ret;
345 }
346
347 /* port->lock held by caller. */
serial_lpc32xx_set_mctrl(struct uart_port * port,unsigned int mctrl)348 static void serial_lpc32xx_set_mctrl(struct uart_port *port,
349 unsigned int mctrl)
350 {
351 /* No signals are supported on HS UARTs */
352 }
353
354 /* port->lock is held by caller and interrupts are disabled. */
serial_lpc32xx_get_mctrl(struct uart_port * port)355 static unsigned int serial_lpc32xx_get_mctrl(struct uart_port *port)
356 {
357 /* No signals are supported on HS UARTs */
358 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
359 }
360
361 /* port->lock held by caller. */
serial_lpc32xx_stop_tx(struct uart_port * port)362 static void serial_lpc32xx_stop_tx(struct uart_port *port)
363 {
364 u32 tmp;
365
366 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
367 tmp &= ~LPC32XX_HSU_TX_INT_EN;
368 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
369 }
370
371 /* port->lock held by caller. */
serial_lpc32xx_start_tx(struct uart_port * port)372 static void serial_lpc32xx_start_tx(struct uart_port *port)
373 {
374 u32 tmp;
375
376 __serial_lpc32xx_tx(port);
377 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
378 tmp |= LPC32XX_HSU_TX_INT_EN;
379 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
380 }
381
382 /* port->lock held by caller. */
serial_lpc32xx_stop_rx(struct uart_port * port)383 static void serial_lpc32xx_stop_rx(struct uart_port *port)
384 {
385 u32 tmp;
386
387 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
388 tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
389 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
390
391 writel((LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT |
392 LPC32XX_HSU_FE_INT), LPC32XX_HSUART_IIR(port->membase));
393 }
394
395 /* port->lock is not held. */
serial_lpc32xx_break_ctl(struct uart_port * port,int break_state)396 static void serial_lpc32xx_break_ctl(struct uart_port *port,
397 int break_state)
398 {
399 unsigned long flags;
400 u32 tmp;
401
402 uart_port_lock_irqsave(port, &flags);
403 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
404 if (break_state != 0)
405 tmp |= LPC32XX_HSU_BREAK;
406 else
407 tmp &= ~LPC32XX_HSU_BREAK;
408 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
409 uart_port_unlock_irqrestore(port, flags);
410 }
411
412 /* port->lock is not held. */
serial_lpc32xx_startup(struct uart_port * port)413 static int serial_lpc32xx_startup(struct uart_port *port)
414 {
415 int retval;
416 unsigned long flags;
417 u32 tmp;
418
419 uart_port_lock_irqsave(port, &flags);
420
421 __serial_uart_flush(port);
422
423 writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
424 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
425 LPC32XX_HSUART_IIR(port->membase));
426
427 writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
428
429 /*
430 * Set receiver timeout, HSU offset of 20, no break, no interrupts,
431 * and default FIFO trigger levels
432 */
433 tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
434 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
435 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
436
437 lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
438
439 uart_port_unlock_irqrestore(port, flags);
440
441 retval = request_irq(port->irq, serial_lpc32xx_interrupt,
442 0, MODNAME, port);
443 if (!retval)
444 writel((tmp | LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN),
445 LPC32XX_HSUART_CTRL(port->membase));
446
447 return retval;
448 }
449
450 /* port->lock is not held. */
serial_lpc32xx_shutdown(struct uart_port * port)451 static void serial_lpc32xx_shutdown(struct uart_port *port)
452 {
453 u32 tmp;
454 unsigned long flags;
455
456 uart_port_lock_irqsave(port, &flags);
457
458 tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
459 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
460 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
461
462 lpc32xx_loopback_set(port->mapbase, 1); /* go to loopback mode */
463
464 uart_port_unlock_irqrestore(port, flags);
465
466 free_irq(port->irq, port);
467 }
468
469 /* port->lock is not held. */
serial_lpc32xx_set_termios(struct uart_port * port,struct ktermios * termios,const struct ktermios * old)470 static void serial_lpc32xx_set_termios(struct uart_port *port,
471 struct ktermios *termios,
472 const struct ktermios *old)
473 {
474 unsigned long flags;
475 unsigned int baud, quot;
476 u32 tmp;
477
478 /* Always 8-bit, no parity, 1 stop bit */
479 termios->c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD);
480 termios->c_cflag |= CS8;
481
482 termios->c_cflag &= ~(HUPCL | CMSPAR | CLOCAL | CRTSCTS);
483
484 baud = uart_get_baud_rate(port, termios, old, 0,
485 port->uartclk / 14);
486
487 quot = __serial_get_clock_div(port->uartclk, baud);
488
489 uart_port_lock_irqsave(port, &flags);
490
491 /* Ignore characters? */
492 tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
493 if ((termios->c_cflag & CREAD) == 0)
494 tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
495 else
496 tmp |= LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN;
497 writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
498
499 writel(quot, LPC32XX_HSUART_RATE(port->membase));
500
501 uart_update_timeout(port, termios->c_cflag, baud);
502
503 uart_port_unlock_irqrestore(port, flags);
504
505 /* Don't rewrite B0 */
506 if (tty_termios_baud_rate(termios))
507 tty_termios_encode_baud_rate(termios, baud, baud);
508 }
509
serial_lpc32xx_type(struct uart_port * port)510 static const char *serial_lpc32xx_type(struct uart_port *port)
511 {
512 return MODNAME;
513 }
514
serial_lpc32xx_release_port(struct uart_port * port)515 static void serial_lpc32xx_release_port(struct uart_port *port)
516 {
517 if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
518 if (port->flags & UPF_IOREMAP) {
519 iounmap(port->membase);
520 port->membase = NULL;
521 }
522
523 release_mem_region(port->mapbase, SZ_4K);
524 }
525 }
526
serial_lpc32xx_request_port(struct uart_port * port)527 static int serial_lpc32xx_request_port(struct uart_port *port)
528 {
529 int ret = -ENODEV;
530
531 if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
532 ret = 0;
533
534 if (!request_mem_region(port->mapbase, SZ_4K, MODNAME))
535 ret = -EBUSY;
536 else if (port->flags & UPF_IOREMAP) {
537 port->membase = ioremap(port->mapbase, SZ_4K);
538 if (!port->membase) {
539 release_mem_region(port->mapbase, SZ_4K);
540 ret = -ENOMEM;
541 }
542 }
543 }
544
545 return ret;
546 }
547
serial_lpc32xx_config_port(struct uart_port * port,int uflags)548 static void serial_lpc32xx_config_port(struct uart_port *port, int uflags)
549 {
550 int ret;
551
552 ret = serial_lpc32xx_request_port(port);
553 if (ret < 0)
554 return;
555 port->type = PORT_UART00;
556 port->fifosize = 64;
557
558 __serial_uart_flush(port);
559
560 writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
561 LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
562 LPC32XX_HSUART_IIR(port->membase));
563
564 writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
565
566 /* Set receiver timeout, HSU offset of 20, no break, no interrupts,
567 and default FIFO trigger levels */
568 writel(LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
569 LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B,
570 LPC32XX_HSUART_CTRL(port->membase));
571 }
572
serial_lpc32xx_verify_port(struct uart_port * port,struct serial_struct * ser)573 static int serial_lpc32xx_verify_port(struct uart_port *port,
574 struct serial_struct *ser)
575 {
576 int ret = 0;
577
578 if (ser->type != PORT_UART00)
579 ret = -EINVAL;
580
581 return ret;
582 }
583
584 static const struct uart_ops serial_lpc32xx_pops = {
585 .tx_empty = serial_lpc32xx_tx_empty,
586 .set_mctrl = serial_lpc32xx_set_mctrl,
587 .get_mctrl = serial_lpc32xx_get_mctrl,
588 .stop_tx = serial_lpc32xx_stop_tx,
589 .start_tx = serial_lpc32xx_start_tx,
590 .stop_rx = serial_lpc32xx_stop_rx,
591 .break_ctl = serial_lpc32xx_break_ctl,
592 .startup = serial_lpc32xx_startup,
593 .shutdown = serial_lpc32xx_shutdown,
594 .set_termios = serial_lpc32xx_set_termios,
595 .type = serial_lpc32xx_type,
596 .release_port = serial_lpc32xx_release_port,
597 .request_port = serial_lpc32xx_request_port,
598 .config_port = serial_lpc32xx_config_port,
599 .verify_port = serial_lpc32xx_verify_port,
600 };
601
602 /*
603 * Register a set of serial devices attached to a platform device
604 */
serial_hs_lpc32xx_probe(struct platform_device * pdev)605 static int serial_hs_lpc32xx_probe(struct platform_device *pdev)
606 {
607 struct lpc32xx_hsuart_port *p = &lpc32xx_hs_ports[uarts_registered];
608 int ret = 0;
609 struct resource *res;
610
611 if (uarts_registered >= MAX_PORTS) {
612 dev_err(&pdev->dev,
613 "Error: Number of possible ports exceeded (%d)!\n",
614 uarts_registered + 1);
615 return -ENXIO;
616 }
617
618 memset(p, 0, sizeof(*p));
619
620 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
621 if (!res) {
622 dev_err(&pdev->dev,
623 "Error getting mem resource for HS UART port %d\n",
624 uarts_registered);
625 return -ENXIO;
626 }
627 p->port.mapbase = res->start;
628 p->port.membase = NULL;
629
630 ret = platform_get_irq(pdev, 0);
631 if (ret < 0)
632 return ret;
633 p->port.irq = ret;
634
635 p->port.iotype = UPIO_MEM32;
636 p->port.uartclk = LPC32XX_MAIN_OSC_FREQ;
637 p->port.regshift = 2;
638 p->port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
639 p->port.dev = &pdev->dev;
640 p->port.ops = &serial_lpc32xx_pops;
641 p->port.line = uarts_registered++;
642 spin_lock_init(&p->port.lock);
643
644 /* send port to loopback mode by default */
645 lpc32xx_loopback_set(p->port.mapbase, 1);
646
647 ret = uart_add_one_port(&lpc32xx_hs_reg, &p->port);
648
649 platform_set_drvdata(pdev, p);
650
651 return ret;
652 }
653
654 /*
655 * Remove serial ports registered against a platform device.
656 */
serial_hs_lpc32xx_remove(struct platform_device * pdev)657 static void serial_hs_lpc32xx_remove(struct platform_device *pdev)
658 {
659 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
660
661 uart_remove_one_port(&lpc32xx_hs_reg, &p->port);
662 }
663
664
665 #ifdef CONFIG_PM
serial_hs_lpc32xx_suspend(struct platform_device * pdev,pm_message_t state)666 static int serial_hs_lpc32xx_suspend(struct platform_device *pdev,
667 pm_message_t state)
668 {
669 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
670
671 uart_suspend_port(&lpc32xx_hs_reg, &p->port);
672
673 return 0;
674 }
675
serial_hs_lpc32xx_resume(struct platform_device * pdev)676 static int serial_hs_lpc32xx_resume(struct platform_device *pdev)
677 {
678 struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
679
680 uart_resume_port(&lpc32xx_hs_reg, &p->port);
681
682 return 0;
683 }
684 #else
685 #define serial_hs_lpc32xx_suspend NULL
686 #define serial_hs_lpc32xx_resume NULL
687 #endif
688
689 static const struct of_device_id serial_hs_lpc32xx_dt_ids[] = {
690 { .compatible = "nxp,lpc3220-hsuart" },
691 { /* sentinel */ }
692 };
693
694 MODULE_DEVICE_TABLE(of, serial_hs_lpc32xx_dt_ids);
695
696 static struct platform_driver serial_hs_lpc32xx_driver = {
697 .probe = serial_hs_lpc32xx_probe,
698 .remove = serial_hs_lpc32xx_remove,
699 .suspend = serial_hs_lpc32xx_suspend,
700 .resume = serial_hs_lpc32xx_resume,
701 .driver = {
702 .name = MODNAME,
703 .of_match_table = serial_hs_lpc32xx_dt_ids,
704 },
705 };
706
lpc32xx_hsuart_init(void)707 static int __init lpc32xx_hsuart_init(void)
708 {
709 int ret;
710
711 ret = uart_register_driver(&lpc32xx_hs_reg);
712 if (ret)
713 return ret;
714
715 ret = platform_driver_register(&serial_hs_lpc32xx_driver);
716 if (ret)
717 uart_unregister_driver(&lpc32xx_hs_reg);
718
719 return ret;
720 }
721
lpc32xx_hsuart_exit(void)722 static void __exit lpc32xx_hsuart_exit(void)
723 {
724 platform_driver_unregister(&serial_hs_lpc32xx_driver);
725 uart_unregister_driver(&lpc32xx_hs_reg);
726 }
727
728 module_init(lpc32xx_hsuart_init);
729 module_exit(lpc32xx_hsuart_exit);
730
731 MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
732 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
733 MODULE_DESCRIPTION("NXP LPC32XX High Speed UART driver");
734 MODULE_LICENSE("GPL");
735