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Tobias Klauser6b7d8f82010-05-05 10:35:23 +02001/*
2 * altera_uart.c -- Altera UART driver
3 *
4 * Based on mcf.c -- Freescale ColdFire UART driver
5 *
6 * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
7 * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
8 * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
Anton Vorontsov2f8b9c12010-10-01 17:21:33 +040018#include <linux/timer.h>
Tobias Klauser6b7d8f82010-05-05 10:35:23 +020019#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/console.h>
22#include <linux/tty.h>
23#include <linux/tty_flip.h>
24#include <linux/serial.h>
25#include <linux/serial_core.h>
26#include <linux/platform_device.h>
Tobias Klauser7c9325d2011-02-18 11:35:32 +010027#include <linux/of.h>
Tobias Klauser6b7d8f82010-05-05 10:35:23 +020028#include <linux/io.h>
29#include <linux/altera_uart.h>
30
31#define DRV_NAME "altera_uart"
Anton Vorontsov99793c62010-10-01 18:23:24 +040032#define SERIAL_ALTERA_MAJOR 204
33#define SERIAL_ALTERA_MINOR 213
Tobias Klauser6b7d8f82010-05-05 10:35:23 +020034
35/*
36 * Altera UART register definitions according to the Nios UART datasheet:
37 * http://www.altera.com/literature/ds/ds_nios_uart.pdf
38 */
39
40#define ALTERA_UART_SIZE 32
41
42#define ALTERA_UART_RXDATA_REG 0
43#define ALTERA_UART_TXDATA_REG 4
44#define ALTERA_UART_STATUS_REG 8
45#define ALTERA_UART_CONTROL_REG 12
46#define ALTERA_UART_DIVISOR_REG 16
47#define ALTERA_UART_EOP_REG 20
48
49#define ALTERA_UART_STATUS_PE_MSK 0x0001 /* parity error */
50#define ALTERA_UART_STATUS_FE_MSK 0x0002 /* framing error */
51#define ALTERA_UART_STATUS_BRK_MSK 0x0004 /* break */
52#define ALTERA_UART_STATUS_ROE_MSK 0x0008 /* RX overrun error */
53#define ALTERA_UART_STATUS_TOE_MSK 0x0010 /* TX overrun error */
54#define ALTERA_UART_STATUS_TMT_MSK 0x0020 /* TX shift register state */
55#define ALTERA_UART_STATUS_TRDY_MSK 0x0040 /* TX ready */
56#define ALTERA_UART_STATUS_RRDY_MSK 0x0080 /* RX ready */
57#define ALTERA_UART_STATUS_E_MSK 0x0100 /* exception condition */
58#define ALTERA_UART_STATUS_DCTS_MSK 0x0400 /* CTS logic-level change */
59#define ALTERA_UART_STATUS_CTS_MSK 0x0800 /* CTS logic state */
60#define ALTERA_UART_STATUS_EOP_MSK 0x1000 /* EOP written/read */
61
62 /* Enable interrupt on... */
63#define ALTERA_UART_CONTROL_PE_MSK 0x0001 /* ...parity error */
64#define ALTERA_UART_CONTROL_FE_MSK 0x0002 /* ...framing error */
65#define ALTERA_UART_CONTROL_BRK_MSK 0x0004 /* ...break */
66#define ALTERA_UART_CONTROL_ROE_MSK 0x0008 /* ...RX overrun */
67#define ALTERA_UART_CONTROL_TOE_MSK 0x0010 /* ...TX overrun */
68#define ALTERA_UART_CONTROL_TMT_MSK 0x0020 /* ...TX shift register empty */
69#define ALTERA_UART_CONTROL_TRDY_MSK 0x0040 /* ...TX ready */
70#define ALTERA_UART_CONTROL_RRDY_MSK 0x0080 /* ...RX ready */
71#define ALTERA_UART_CONTROL_E_MSK 0x0100 /* ...exception*/
72
73#define ALTERA_UART_CONTROL_TRBK_MSK 0x0200 /* TX break */
74#define ALTERA_UART_CONTROL_DCTS_MSK 0x0400 /* Interrupt on CTS change */
75#define ALTERA_UART_CONTROL_RTS_MSK 0x0800 /* RTS signal */
76#define ALTERA_UART_CONTROL_EOP_MSK 0x1000 /* Interrupt on EOP */
77
78/*
79 * Local per-uart structure.
80 */
81struct altera_uart {
82 struct uart_port port;
Anton Vorontsov2f8b9c12010-10-01 17:21:33 +040083 struct timer_list tmr;
Tobias Klauser6b7d8f82010-05-05 10:35:23 +020084 unsigned int sigs; /* Local copy of line sigs */
85 unsigned short imr; /* Local IMR mirror */
86};
87
Anton Vorontsov0d426ed2010-10-01 17:21:54 +040088static u32 altera_uart_readl(struct uart_port *port, int reg)
89{
Tobias Klauser2780ad42011-02-09 10:57:04 +010090 return readl(port->membase + (reg << port->regshift));
Anton Vorontsov0d426ed2010-10-01 17:21:54 +040091}
92
93static void altera_uart_writel(struct uart_port *port, u32 dat, int reg)
94{
Tobias Klauser2780ad42011-02-09 10:57:04 +010095 writel(dat, port->membase + (reg << port->regshift));
Anton Vorontsov0d426ed2010-10-01 17:21:54 +040096}
97
Tobias Klauser6b7d8f82010-05-05 10:35:23 +020098static unsigned int altera_uart_tx_empty(struct uart_port *port)
99{
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400100 return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200101 ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0;
102}
103
104static unsigned int altera_uart_get_mctrl(struct uart_port *port)
105{
106 struct altera_uart *pp = container_of(port, struct altera_uart, port);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200107 unsigned int sigs;
108
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400109 sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200110 ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0;
111 sigs |= (pp->sigs & TIOCM_RTS);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200112
113 return sigs;
114}
115
116static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs)
117{
118 struct altera_uart *pp = container_of(port, struct altera_uart, port);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200119
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200120 pp->sigs = sigs;
121 if (sigs & TIOCM_RTS)
122 pp->imr |= ALTERA_UART_CONTROL_RTS_MSK;
123 else
124 pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK;
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400125 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200126}
127
128static void altera_uart_start_tx(struct uart_port *port)
129{
130 struct altera_uart *pp = container_of(port, struct altera_uart, port);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200131
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200132 pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK;
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400133 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200134}
135
136static void altera_uart_stop_tx(struct uart_port *port)
137{
138 struct altera_uart *pp = container_of(port, struct altera_uart, port);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200139
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200140 pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400141 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200142}
143
144static void altera_uart_stop_rx(struct uart_port *port)
145{
146 struct altera_uart *pp = container_of(port, struct altera_uart, port);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200147
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200148 pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK;
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400149 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200150}
151
152static void altera_uart_break_ctl(struct uart_port *port, int break_state)
153{
154 struct altera_uart *pp = container_of(port, struct altera_uart, port);
155 unsigned long flags;
156
157 spin_lock_irqsave(&port->lock, flags);
158 if (break_state == -1)
159 pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK;
160 else
161 pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK;
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400162 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200163 spin_unlock_irqrestore(&port->lock, flags);
164}
165
166static void altera_uart_enable_ms(struct uart_port *port)
167{
168}
169
170static void altera_uart_set_termios(struct uart_port *port,
171 struct ktermios *termios,
172 struct ktermios *old)
173{
174 unsigned long flags;
175 unsigned int baud, baudclk;
176
177 baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
178 baudclk = port->uartclk / baud;
179
180 if (old)
181 tty_termios_copy_hw(termios, old);
182 tty_termios_encode_baud_rate(termios, baud, baud);
183
184 spin_lock_irqsave(&port->lock, flags);
Anton Vorontsov2f8b9c12010-10-01 17:21:33 +0400185 uart_update_timeout(port, termios->c_cflag, baud);
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400186 altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200187 spin_unlock_irqrestore(&port->lock, flags);
188}
189
190static void altera_uart_rx_chars(struct altera_uart *pp)
191{
192 struct uart_port *port = &pp->port;
193 unsigned char ch, flag;
194 unsigned short status;
195
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400196 while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) &
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200197 ALTERA_UART_STATUS_RRDY_MSK) {
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400198 ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200199 flag = TTY_NORMAL;
200 port->icount.rx++;
201
202 if (status & ALTERA_UART_STATUS_E_MSK) {
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400203 altera_uart_writel(port, status,
204 ALTERA_UART_STATUS_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200205
206 if (status & ALTERA_UART_STATUS_BRK_MSK) {
207 port->icount.brk++;
208 if (uart_handle_break(port))
209 continue;
210 } else if (status & ALTERA_UART_STATUS_PE_MSK) {
211 port->icount.parity++;
212 } else if (status & ALTERA_UART_STATUS_ROE_MSK) {
213 port->icount.overrun++;
214 } else if (status & ALTERA_UART_STATUS_FE_MSK) {
215 port->icount.frame++;
216 }
217
218 status &= port->read_status_mask;
219
220 if (status & ALTERA_UART_STATUS_BRK_MSK)
221 flag = TTY_BREAK;
222 else if (status & ALTERA_UART_STATUS_PE_MSK)
223 flag = TTY_PARITY;
224 else if (status & ALTERA_UART_STATUS_FE_MSK)
225 flag = TTY_FRAME;
226 }
227
228 if (uart_handle_sysrq_char(port, ch))
229 continue;
230 uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch,
231 flag);
232 }
233
234 tty_flip_buffer_push(port->state->port.tty);
235}
236
237static void altera_uart_tx_chars(struct altera_uart *pp)
238{
239 struct uart_port *port = &pp->port;
240 struct circ_buf *xmit = &port->state->xmit;
241
242 if (port->x_char) {
243 /* Send special char - probably flow control */
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400244 altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200245 port->x_char = 0;
246 port->icount.tx++;
247 return;
248 }
249
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400250 while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200251 ALTERA_UART_STATUS_TRDY_MSK) {
252 if (xmit->head == xmit->tail)
253 break;
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400254 altera_uart_writel(port, xmit->buf[xmit->tail],
255 ALTERA_UART_TXDATA_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200256 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
257 port->icount.tx++;
258 }
259
260 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
261 uart_write_wakeup(port);
262
263 if (xmit->head == xmit->tail) {
264 pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400265 altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200266 }
267}
268
269static irqreturn_t altera_uart_interrupt(int irq, void *data)
270{
271 struct uart_port *port = data;
272 struct altera_uart *pp = container_of(port, struct altera_uart, port);
273 unsigned int isr;
274
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400275 isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
Tobias Klauserd8d721f2010-05-25 16:59:55 +0200276
277 spin_lock(&port->lock);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200278 if (isr & ALTERA_UART_STATUS_RRDY_MSK)
279 altera_uart_rx_chars(pp);
280 if (isr & ALTERA_UART_STATUS_TRDY_MSK)
281 altera_uart_tx_chars(pp);
Tobias Klauserd8d721f2010-05-25 16:59:55 +0200282 spin_unlock(&port->lock);
283
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200284 return IRQ_RETVAL(isr);
285}
286
Anton Vorontsov2f8b9c12010-10-01 17:21:33 +0400287static void altera_uart_timer(unsigned long data)
288{
289 struct uart_port *port = (void *)data;
290 struct altera_uart *pp = container_of(port, struct altera_uart, port);
291
292 altera_uart_interrupt(0, port);
293 mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
294}
295
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200296static void altera_uart_config_port(struct uart_port *port, int flags)
297{
298 port->type = PORT_ALTERA_UART;
299
300 /* Clear mask, so no surprise interrupts. */
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400301 altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200302 /* Clear status register */
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400303 altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200304}
305
306static int altera_uart_startup(struct uart_port *port)
307{
308 struct altera_uart *pp = container_of(port, struct altera_uart, port);
309 unsigned long flags;
310 int ret;
311
Anton Vorontsov2f8b9c12010-10-01 17:21:33 +0400312 if (!port->irq) {
313 setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
314 mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
315 return 0;
316 }
317
Yong Zhang9cfb5c02011-09-22 16:59:15 +0800318 ret = request_irq(port->irq, altera_uart_interrupt, 0,
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200319 DRV_NAME, port);
320 if (ret) {
321 pr_err(DRV_NAME ": unable to attach Altera UART %d "
322 "interrupt vector=%d\n", port->line, port->irq);
323 return ret;
324 }
325
326 spin_lock_irqsave(&port->lock, flags);
327
328 /* Enable RX interrupts now */
329 pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
330 writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
331
332 spin_unlock_irqrestore(&port->lock, flags);
333
334 return 0;
335}
336
337static void altera_uart_shutdown(struct uart_port *port)
338{
339 struct altera_uart *pp = container_of(port, struct altera_uart, port);
340 unsigned long flags;
341
342 spin_lock_irqsave(&port->lock, flags);
343
344 /* Disable all interrupts now */
345 pp->imr = 0;
346 writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
347
348 spin_unlock_irqrestore(&port->lock, flags);
349
Anton Vorontsov2f8b9c12010-10-01 17:21:33 +0400350 if (port->irq)
351 free_irq(port->irq, port);
352 else
353 del_timer_sync(&pp->tmr);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200354}
355
356static const char *altera_uart_type(struct uart_port *port)
357{
358 return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
359}
360
361static int altera_uart_request_port(struct uart_port *port)
362{
363 /* UARTs always present */
364 return 0;
365}
366
367static void altera_uart_release_port(struct uart_port *port)
368{
369 /* Nothing to release... */
370}
371
372static int altera_uart_verify_port(struct uart_port *port,
373 struct serial_struct *ser)
374{
375 if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
376 return -EINVAL;
377 return 0;
378}
379
Tobias Klauser418a9362012-02-08 14:36:09 +0100380#ifdef CONFIG_CONSOLE_POLL
381static int altera_uart_poll_get_char(struct uart_port *port)
382{
383 while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
384 ALTERA_UART_STATUS_RRDY_MSK))
385 cpu_relax();
386
387 return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
388}
389
390static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
391{
392 while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
393 ALTERA_UART_STATUS_TRDY_MSK))
394 cpu_relax();
395
396 altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
397}
398#endif
399
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200400/*
401 * Define the basic serial functions we support.
402 */
403static struct uart_ops altera_uart_ops = {
404 .tx_empty = altera_uart_tx_empty,
405 .get_mctrl = altera_uart_get_mctrl,
406 .set_mctrl = altera_uart_set_mctrl,
407 .start_tx = altera_uart_start_tx,
408 .stop_tx = altera_uart_stop_tx,
409 .stop_rx = altera_uart_stop_rx,
410 .enable_ms = altera_uart_enable_ms,
411 .break_ctl = altera_uart_break_ctl,
412 .startup = altera_uart_startup,
413 .shutdown = altera_uart_shutdown,
414 .set_termios = altera_uart_set_termios,
415 .type = altera_uart_type,
416 .request_port = altera_uart_request_port,
417 .release_port = altera_uart_release_port,
418 .config_port = altera_uart_config_port,
419 .verify_port = altera_uart_verify_port,
Tobias Klauser418a9362012-02-08 14:36:09 +0100420#ifdef CONFIG_CONSOLE_POLL
421 .poll_get_char = altera_uart_poll_get_char,
422 .poll_put_char = altera_uart_poll_put_char,
423#endif
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200424};
425
426static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
427
428#if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
429
Tobias Klauserfadf34f2010-05-25 17:00:08 +0200430static void altera_uart_console_putc(struct uart_port *port, const char c)
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200431{
Anton Vorontsov0d426ed2010-10-01 17:21:54 +0400432 while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
Andrew Mortone8dd4752010-07-20 15:26:10 -0700433 ALTERA_UART_STATUS_TRDY_MSK))
Tobias Klauserfadf34f2010-05-25 17:00:08 +0200434 cpu_relax();
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200435
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200436 writel(c, port->membase + ALTERA_UART_TXDATA_REG);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200437}
438
439static void altera_uart_console_write(struct console *co, const char *s,
440 unsigned int count)
441{
Tobias Klauserfadf34f2010-05-25 17:00:08 +0200442 struct uart_port *port = &(altera_uart_ports + co->index)->port;
443
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200444 for (; count; count--, s++) {
Tobias Klauserfadf34f2010-05-25 17:00:08 +0200445 altera_uart_console_putc(port, *s);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200446 if (*s == '\n')
Tobias Klauserfadf34f2010-05-25 17:00:08 +0200447 altera_uart_console_putc(port, '\r');
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200448 }
449}
450
451static int __init altera_uart_console_setup(struct console *co, char *options)
452{
453 struct uart_port *port;
454 int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
455 int bits = 8;
456 int parity = 'n';
457 int flow = 'n';
458
459 if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
460 return -EINVAL;
461 port = &altera_uart_ports[co->index].port;
Anton Vorontsov70eebd02010-10-01 17:23:13 +0400462 if (!port->membase)
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200463 return -ENODEV;
464
465 if (options)
466 uart_parse_options(options, &baud, &parity, &bits, &flow);
467
468 return uart_set_options(port, co, baud, parity, bits, flow);
469}
470
471static struct uart_driver altera_uart_driver;
472
473static struct console altera_uart_console = {
Anton Vorontsov99793c62010-10-01 18:23:24 +0400474 .name = "ttyAL",
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200475 .write = altera_uart_console_write,
476 .device = uart_console_device,
477 .setup = altera_uart_console_setup,
478 .flags = CON_PRINTBUFFER,
479 .index = -1,
480 .data = &altera_uart_driver,
481};
482
483static int __init altera_uart_console_init(void)
484{
485 register_console(&altera_uart_console);
486 return 0;
487}
488
489console_initcall(altera_uart_console_init);
490
491#define ALTERA_UART_CONSOLE (&altera_uart_console)
492
493#else
494
495#define ALTERA_UART_CONSOLE NULL
496
497#endif /* CONFIG_ALTERA_UART_CONSOLE */
498
499/*
500 * Define the altera_uart UART driver structure.
501 */
502static struct uart_driver altera_uart_driver = {
503 .owner = THIS_MODULE,
504 .driver_name = DRV_NAME,
Anton Vorontsov99793c62010-10-01 18:23:24 +0400505 .dev_name = "ttyAL",
506 .major = SERIAL_ALTERA_MAJOR,
507 .minor = SERIAL_ALTERA_MINOR,
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200508 .nr = CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
509 .cons = ALTERA_UART_CONSOLE,
510};
511
Tobias Klauser7c9325d2011-02-18 11:35:32 +0100512#ifdef CONFIG_OF
513static int altera_uart_get_of_uartclk(struct platform_device *pdev,
514 struct uart_port *port)
515{
516 int len;
517 const __be32 *clk;
518
519 clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len);
520 if (!clk || len < sizeof(__be32))
521 return -ENODEV;
522
523 port->uartclk = be32_to_cpup(clk);
524
525 return 0;
526}
527#else
528static int altera_uart_get_of_uartclk(struct platform_device *pdev,
529 struct uart_port *port)
530{
531 return -ENODEV;
532}
533#endif /* CONFIG_OF */
534
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200535static int __devinit altera_uart_probe(struct platform_device *pdev)
536{
537 struct altera_uart_platform_uart *platp = pdev->dev.platform_data;
538 struct uart_port *port;
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400539 struct resource *res_mem;
540 struct resource *res_irq;
541 int i = pdev->id;
Tobias Klauser7c9325d2011-02-18 11:35:32 +0100542 int ret;
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200543
Tobias Klausera664ec92011-03-28 13:57:11 +0200544 /* if id is -1 scan for a free id and use that one */
545 if (i == -1) {
546 for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
547 if (altera_uart_ports[i].port.mapbase == 0)
548 break;
549 }
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200550
Tobias Klausera664ec92011-03-28 13:57:11 +0200551 if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400552 return -EINVAL;
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200553
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400554 port = &altera_uart_ports[i].port;
555
556 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
557 if (res_mem)
558 port->mapbase = res_mem->start;
Yuriy Kozlovacede702012-03-29 09:55:27 +0200559 else if (platp)
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400560 port->mapbase = platp->mapbase;
561 else
562 return -EINVAL;
563
564 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
565 if (res_irq)
566 port->irq = res_irq->start;
Yuriy Kozlovacede702012-03-29 09:55:27 +0200567 else if (platp)
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400568 port->irq = platp->irq;
569
Tobias Klauser7c9325d2011-02-18 11:35:32 +0100570 /* Check platform data first so we can override device node data */
571 if (platp)
572 port->uartclk = platp->uartclk;
573 else {
574 ret = altera_uart_get_of_uartclk(pdev, port);
575 if (ret)
576 return ret;
577 }
578
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400579 port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
580 if (!port->membase)
581 return -ENOMEM;
582
Tobias Klauser2780ad42011-02-09 10:57:04 +0100583 if (platp)
584 port->regshift = platp->bus_shift;
585 else
586 port->regshift = 0;
587
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400588 port->line = i;
589 port->type = PORT_ALTERA_UART;
590 port->iotype = SERIAL_IO_MEM;
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400591 port->ops = &altera_uart_ops;
Anton Vorontsov288e9fe2010-10-01 17:22:37 +0400592 port->flags = UPF_BOOT_AUTOCONF;
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400593
Tobias Klausera664ec92011-03-28 13:57:11 +0200594 dev_set_drvdata(&pdev->dev, port);
595
Anton Vorontsov6b5756f2010-10-01 17:21:42 +0400596 uart_add_one_port(&altera_uart_driver, port);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200597
598 return 0;
599}
600
Tobias Klauserc1bfffa2010-05-31 15:01:08 +0200601static int __devexit altera_uart_remove(struct platform_device *pdev)
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200602{
Tobias Klausera664ec92011-03-28 13:57:11 +0200603 struct uart_port *port = dev_get_drvdata(&pdev->dev);
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200604
Tobias Klausera664ec92011-03-28 13:57:11 +0200605 if (port) {
606 uart_remove_one_port(&altera_uart_driver, port);
607 dev_set_drvdata(&pdev->dev, NULL);
608 port->mapbase = 0;
609 }
Tobias Klausere96fabd2011-02-09 10:56:52 +0100610
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200611 return 0;
612}
613
Tobias Klauser7c9325d2011-02-18 11:35:32 +0100614#ifdef CONFIG_OF
615static struct of_device_id altera_uart_match[] = {
616 { .compatible = "ALTR,uart-1.0", },
617 {},
618};
619MODULE_DEVICE_TABLE(of, altera_uart_match);
Tobias Klauser7c9325d2011-02-18 11:35:32 +0100620#endif /* CONFIG_OF */
621
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200622static struct platform_driver altera_uart_platform_driver = {
623 .probe = altera_uart_probe,
624 .remove = __devexit_p(altera_uart_remove),
625 .driver = {
Tobias Klauser7c9325d2011-02-18 11:35:32 +0100626 .name = DRV_NAME,
627 .owner = THIS_MODULE,
Ben Dooks85888062011-08-03 10:11:43 +0100628 .of_match_table = of_match_ptr(altera_uart_match),
Tobias Klauser6b7d8f82010-05-05 10:35:23 +0200629 },
630};
631
632static int __init altera_uart_init(void)
633{
634 int rc;
635
636 rc = uart_register_driver(&altera_uart_driver);
637 if (rc)
638 return rc;
639 rc = platform_driver_register(&altera_uart_platform_driver);
640 if (rc) {
641 uart_unregister_driver(&altera_uart_driver);
642 return rc;
643 }
644 return 0;
645}
646
647static void __exit altera_uart_exit(void)
648{
649 platform_driver_unregister(&altera_uart_platform_driver);
650 uart_unregister_driver(&altera_uart_driver);
651}
652
653module_init(altera_uart_init);
654module_exit(altera_uart_exit);
655
656MODULE_DESCRIPTION("Altera UART driver");
657MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
658MODULE_LICENSE("GPL");
659MODULE_ALIAS("platform:" DRV_NAME);
Anton Vorontsov99793c62010-10-01 18:23:24 +0400660MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR);