blob: 3a2aa7e277fa476379b2bf0b5c0fc2614f600b80 [file] [log] [blame]
Bryan Wu194de562007-05-06 14:50:30 -07001/*
2 * File: drivers/serial/bfin_5xx.c
3 * Based on: Based on drivers/serial/sa1100.c
4 * Author: Aubrey Li <aubrey.li@analog.com>
5 *
6 * Created:
7 * Description: Driver for blackfin 5xx serial ports
8 *
Bryan Wu194de562007-05-06 14:50:30 -07009 * Modified:
10 * Copyright 2006 Analog Devices Inc.
11 *
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
28 */
29
30#if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
31#define SUPPORT_SYSRQ
32#endif
33
34#include <linux/module.h>
35#include <linux/ioport.h>
36#include <linux/init.h>
37#include <linux/console.h>
38#include <linux/sysrq.h>
39#include <linux/platform_device.h>
40#include <linux/tty.h>
41#include <linux/tty_flip.h>
42#include <linux/serial_core.h>
43
Sonic Zhang474f1a62007-06-29 16:35:17 +080044#ifdef CONFIG_KGDB_UART
45#include <linux/kgdb.h>
46#include <asm/irq_regs.h>
47#endif
48
Bryan Wu194de562007-05-06 14:50:30 -070049#include <asm/gpio.h>
50#include <asm/mach/bfin_serial_5xx.h>
51
52#ifdef CONFIG_SERIAL_BFIN_DMA
53#include <linux/dma-mapping.h>
54#include <asm/io.h>
55#include <asm/irq.h>
56#include <asm/cacheflush.h>
57#endif
58
59/* UART name and device definitions */
60#define BFIN_SERIAL_NAME "ttyBF"
61#define BFIN_SERIAL_MAJOR 204
62#define BFIN_SERIAL_MINOR 64
63
64/*
65 * Setup for console. Argument comes from the menuconfig
66 */
67#define DMA_RX_XCOUNT 512
68#define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
69
70#define DMA_RX_FLUSH_JIFFIES 5
71
72#ifdef CONFIG_SERIAL_BFIN_DMA
73static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
74#else
75static void bfin_serial_do_work(struct work_struct *work);
76static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
Bryan Wu194de562007-05-06 14:50:30 -070077#endif
78
79static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
80
81/*
82 * interrupts are disabled on entry
83 */
84static void bfin_serial_stop_tx(struct uart_port *port)
85{
86 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
Sonic Zhang1b733512007-12-21 16:45:12 +080087#if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
Sonic Zhang759eb042007-11-21 17:00:32 +080088 unsigned short ier;
89#endif
Bryan Wu194de562007-05-06 14:50:30 -070090
Roy Huangf4d640c92007-07-12 16:43:46 +080091 while (!(UART_GET_LSR(uart) & TEMT))
92 continue;
Roy Huangf4d640c92007-07-12 16:43:46 +080093
Bryan Wu194de562007-05-06 14:50:30 -070094#ifdef CONFIG_SERIAL_BFIN_DMA
95 disable_dma(uart->tx_dma_channel);
96#else
Roy Huangf4d640c92007-07-12 16:43:46 +080097#ifdef CONFIG_BF54x
98 /* Waiting for Transmission Finished */
99 while (!(UART_GET_LSR(uart) & TFI))
100 continue;
101 /* Clear TFI bit */
102 UART_PUT_LSR(uart, TFI);
103 UART_CLEAR_IER(uart, ETBEI);
104#else
Bryan Wu194de562007-05-06 14:50:30 -0700105 ier = UART_GET_IER(uart);
106 ier &= ~ETBEI;
107 UART_PUT_IER(uart, ier);
108#endif
Roy Huangf4d640c92007-07-12 16:43:46 +0800109#endif
Bryan Wu194de562007-05-06 14:50:30 -0700110}
111
112/*
113 * port is locked and interrupts are disabled
114 */
115static void bfin_serial_start_tx(struct uart_port *port)
116{
117 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
118
119#ifdef CONFIG_SERIAL_BFIN_DMA
120 bfin_serial_dma_tx_chars(uart);
121#else
Roy Huangf4d640c92007-07-12 16:43:46 +0800122#ifdef CONFIG_BF54x
123 UART_SET_IER(uart, ETBEI);
124#else
Bryan Wu194de562007-05-06 14:50:30 -0700125 unsigned short ier;
126 ier = UART_GET_IER(uart);
127 ier |= ETBEI;
128 UART_PUT_IER(uart, ier);
Bryan Wu194de562007-05-06 14:50:30 -0700129#endif
Sonic Zhanga359cca2007-10-10 16:47:58 +0800130 bfin_serial_tx_chars(uart);
Roy Huangf4d640c92007-07-12 16:43:46 +0800131#endif
Bryan Wu194de562007-05-06 14:50:30 -0700132}
133
134/*
135 * Interrupts are enabled
136 */
137static void bfin_serial_stop_rx(struct uart_port *port)
138{
139 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
Sonic Zhanga359cca2007-10-10 16:47:58 +0800140#ifdef CONFIG_KGDB_UART
141 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
142#endif
Roy Huangf4d640c92007-07-12 16:43:46 +0800143#ifdef CONFIG_BF54x
144 UART_CLEAR_IER(uart, ERBFI);
145#else
Bryan Wu194de562007-05-06 14:50:30 -0700146 unsigned short ier;
147
148 ier = UART_GET_IER(uart);
149 ier &= ~ERBFI;
150 UART_PUT_IER(uart, ier);
Roy Huangf4d640c92007-07-12 16:43:46 +0800151#endif
Sonic Zhanga359cca2007-10-10 16:47:58 +0800152#ifdef CONFIG_KGDB_UART
153 }
154#endif
Bryan Wu194de562007-05-06 14:50:30 -0700155}
156
157/*
158 * Set the modem control timer to fire immediately.
159 */
160static void bfin_serial_enable_ms(struct uart_port *port)
161{
162}
163
Sonic Zhang474f1a62007-06-29 16:35:17 +0800164#ifdef CONFIG_KGDB_UART
165static int kgdb_entry_state;
166
167void kgdb_put_debug_char(int chr)
168{
169 struct bfin_serial_port *uart;
170
171 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
172 uart = &bfin_serial_ports[0];
173 else
174 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
175
176 while (!(UART_GET_LSR(uart) & THRE)) {
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800177 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800178 }
Sonic Zhanga359cca2007-10-10 16:47:58 +0800179
180#ifndef CONFIG_BF54x
Sonic Zhang474f1a62007-06-29 16:35:17 +0800181 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800182 SSYNC();
Sonic Zhanga359cca2007-10-10 16:47:58 +0800183#endif
Sonic Zhang474f1a62007-06-29 16:35:17 +0800184 UART_PUT_CHAR(uart, (unsigned char)chr);
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800185 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800186}
187
188int kgdb_get_debug_char(void)
189{
190 struct bfin_serial_port *uart;
191 unsigned char chr;
192
193 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
194 uart = &bfin_serial_ports[0];
195 else
196 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
197
198 while(!(UART_GET_LSR(uart) & DR)) {
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800199 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800200 }
Sonic Zhanga359cca2007-10-10 16:47:58 +0800201#ifndef CONFIG_BF54x
Sonic Zhang474f1a62007-06-29 16:35:17 +0800202 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800203 SSYNC();
Sonic Zhanga359cca2007-10-10 16:47:58 +0800204#endif
Sonic Zhang474f1a62007-06-29 16:35:17 +0800205 chr = UART_GET_CHAR(uart);
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800206 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800207
208 return chr;
209}
210#endif
211
Bryan Wu194de562007-05-06 14:50:30 -0700212#ifdef CONFIG_SERIAL_BFIN_PIO
Bryan Wu194de562007-05-06 14:50:30 -0700213static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
214{
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800215 struct tty_struct *tty = uart->port.info->tty;
Bryan Wu194de562007-05-06 14:50:30 -0700216 unsigned int status, ch, flg;
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800217 static int in_break = 0;
Sonic Zhang474f1a62007-06-29 16:35:17 +0800218#ifdef CONFIG_KGDB_UART
219 struct pt_regs *regs = get_irq_regs();
220#endif
Bryan Wu194de562007-05-06 14:50:30 -0700221
Bryan Wu194de562007-05-06 14:50:30 -0700222 ch = UART_GET_CHAR(uart);
Sonic Zhang759eb042007-11-21 17:00:32 +0800223 status = UART_GET_LSR(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700224 uart->port.icount.rx++;
225
Sonic Zhang474f1a62007-06-29 16:35:17 +0800226#ifdef CONFIG_KGDB_UART
227 if (uart->port.line == CONFIG_KGDB_UART_PORT) {
228 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
229 kgdb_breakkey_pressed(regs);
230 return;
231 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
232 kgdb_entry_state = 1;
233 } else if (kgdb_entry_state == 1 && ch == 'q') {
234 kgdb_entry_state = 0;
235 kgdb_breakkey_pressed(regs);
236 return;
237 } else if (ch == 0x3) {/* Ctrl + C */
238 kgdb_entry_state = 0;
239 kgdb_breakkey_pressed(regs);
240 return;
241 } else {
242 kgdb_entry_state = 0;
243 }
244 }
245#endif
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800246
247 if (ANOMALY_05000230) {
248 /* The BF533 family of processors have a nice misbehavior where
249 * they continuously generate characters for a "single" break.
250 * We have to basically ignore this flood until the "next" valid
251 * character comes across. All other Blackfin families operate
252 * properly though.
253 * Note: While Anomaly 05000230 does not directly address this,
254 * the changes that went in for it also fixed this issue.
255 */
256 if (in_break) {
257 if (ch != 0) {
258 in_break = 0;
259 ch = UART_GET_CHAR(uart);
260 if (bfin_revid() < 5)
261 return;
262 } else
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800263 return;
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800264 }
Bryan Wu194de562007-05-06 14:50:30 -0700265 }
Bryan Wu194de562007-05-06 14:50:30 -0700266
267 if (status & BI) {
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800268 if (ANOMALY_05000230)
269 in_break = 1;
Bryan Wu194de562007-05-06 14:50:30 -0700270 uart->port.icount.brk++;
271 if (uart_handle_break(&uart->port))
272 goto ignore_char;
Mike Frysinger98089012007-06-11 15:31:30 +0800273 status &= ~(PE | FE);
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800274 }
275 if (status & PE)
Bryan Wu194de562007-05-06 14:50:30 -0700276 uart->port.icount.parity++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800277 if (status & OE)
Bryan Wu194de562007-05-06 14:50:30 -0700278 uart->port.icount.overrun++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800279 if (status & FE)
Bryan Wu194de562007-05-06 14:50:30 -0700280 uart->port.icount.frame++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800281
282 status &= uart->port.read_status_mask;
283
284 if (status & BI)
285 flg = TTY_BREAK;
286 else if (status & PE)
287 flg = TTY_PARITY;
288 else if (status & FE)
289 flg = TTY_FRAME;
290 else
Bryan Wu194de562007-05-06 14:50:30 -0700291 flg = TTY_NORMAL;
292
293 if (uart_handle_sysrq_char(&uart->port, ch))
294 goto ignore_char;
Bryan Wu194de562007-05-06 14:50:30 -0700295
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800296 uart_insert_char(&uart->port, status, OE, ch, flg);
297
298 ignore_char:
299 tty_flip_buffer_push(tty);
Bryan Wu194de562007-05-06 14:50:30 -0700300}
301
302static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
303{
304 struct circ_buf *xmit = &uart->port.info->xmit;
305
306 if (uart->port.x_char) {
307 UART_PUT_CHAR(uart, uart->port.x_char);
308 uart->port.icount.tx++;
309 uart->port.x_char = 0;
Bryan Wu194de562007-05-06 14:50:30 -0700310 }
311 /*
312 * Check the modem control lines before
313 * transmitting anything.
314 */
315 bfin_serial_mctrl_check(uart);
316
317 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
318 bfin_serial_stop_tx(&uart->port);
319 return;
320 }
321
Sonic Zhang759eb042007-11-21 17:00:32 +0800322 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
323 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
324 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
325 uart->port.icount.tx++;
326 SSYNC();
327 }
Bryan Wu194de562007-05-06 14:50:30 -0700328
329 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
330 uart_write_wakeup(&uart->port);
331
332 if (uart_circ_empty(xmit))
333 bfin_serial_stop_tx(&uart->port);
334}
335
Aubrey Li5c4e4722007-05-21 18:09:38 +0800336static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
337{
338 struct bfin_serial_port *uart = dev_id;
339
Roy Huangf4d640c92007-07-12 16:43:46 +0800340 spin_lock(&uart->port.lock);
Sonic Zhang759eb042007-11-21 17:00:32 +0800341 while ((UART_GET_IER(uart) & ERBFI) && (UART_GET_LSR(uart) & DR))
Aubrey Li5c4e4722007-05-21 18:09:38 +0800342 bfin_serial_rx_chars(uart);
343 spin_unlock(&uart->port.lock);
Sonic Zhang759eb042007-11-21 17:00:32 +0800344
Aubrey Li5c4e4722007-05-21 18:09:38 +0800345 return IRQ_HANDLED;
346}
347
348static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
Bryan Wu194de562007-05-06 14:50:30 -0700349{
350 struct bfin_serial_port *uart = dev_id;
Bryan Wu194de562007-05-06 14:50:30 -0700351
Roy Huangf4d640c92007-07-12 16:43:46 +0800352 spin_lock(&uart->port.lock);
Sonic Zhang759eb042007-11-21 17:00:32 +0800353 if ((UART_GET_IER(uart) & ETBEI) && (UART_GET_LSR(uart) & THRE))
Aubrey Li5c4e4722007-05-21 18:09:38 +0800354 bfin_serial_tx_chars(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700355 spin_unlock(&uart->port.lock);
Sonic Zhang759eb042007-11-21 17:00:32 +0800356
Bryan Wu194de562007-05-06 14:50:30 -0700357 return IRQ_HANDLED;
358}
359
Aubrey Li5c4e4722007-05-21 18:09:38 +0800360
Bryan Wu194de562007-05-06 14:50:30 -0700361static void bfin_serial_do_work(struct work_struct *work)
362{
363 struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
364
365 bfin_serial_mctrl_check(uart);
366}
Bryan Wu194de562007-05-06 14:50:30 -0700367#endif
368
369#ifdef CONFIG_SERIAL_BFIN_DMA
370static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
371{
372 struct circ_buf *xmit = &uart->port.info->xmit;
373 unsigned short ier;
374 int flags = 0;
375
376 if (!uart->tx_done)
377 return;
Bryan Wu194de562007-05-06 14:50:30 -0700378 uart->tx_done = 0;
379
Bryan Wu194de562007-05-06 14:50:30 -0700380 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
381 bfin_serial_stop_tx(&uart->port);
382 uart->tx_done = 1;
383 return;
384 }
385
Sonic Zhang1b733512007-12-21 16:45:12 +0800386 if (uart->port.x_char) {
387 UART_PUT_CHAR(uart, uart->port.x_char);
388 uart->port.icount.tx++;
389 uart->port.x_char = 0;
390 }
391
392 /*
393 * Check the modem control lines before
394 * transmitting anything.
395 */
396 bfin_serial_mctrl_check(uart);
397
Bryan Wu194de562007-05-06 14:50:30 -0700398 spin_lock_irqsave(&uart->port.lock, flags);
399 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
400 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
401 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
402 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
403 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
404 set_dma_config(uart->tx_dma_channel,
405 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
406 INTR_ON_BUF,
407 DIMENSION_LINEAR,
Michael Hennerich2047e402008-01-22 15:29:18 +0800408 DATA_SIZE_8,
409 DMA_SYNC_RESTART));
Bryan Wu194de562007-05-06 14:50:30 -0700410 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
411 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
412 set_dma_x_modify(uart->tx_dma_channel, 1);
413 enable_dma(uart->tx_dma_channel);
Roy Huangf4d640c92007-07-12 16:43:46 +0800414#ifdef CONFIG_BF54x
415 UART_SET_IER(uart, ETBEI);
416#else
Bryan Wu194de562007-05-06 14:50:30 -0700417 ier = UART_GET_IER(uart);
418 ier |= ETBEI;
419 UART_PUT_IER(uart, ier);
Roy Huangf4d640c92007-07-12 16:43:46 +0800420#endif
Bryan Wu194de562007-05-06 14:50:30 -0700421 spin_unlock_irqrestore(&uart->port.lock, flags);
422}
423
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800424static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
Bryan Wu194de562007-05-06 14:50:30 -0700425{
426 struct tty_struct *tty = uart->port.info->tty;
427 int i, flg, status;
428
429 status = UART_GET_LSR(uart);
430 uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
431
432 if (status & BI) {
433 uart->port.icount.brk++;
434 if (uart_handle_break(&uart->port))
435 goto dma_ignore_char;
Mike Frysinger98089012007-06-11 15:31:30 +0800436 status &= ~(PE | FE);
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800437 }
438 if (status & PE)
Bryan Wu194de562007-05-06 14:50:30 -0700439 uart->port.icount.parity++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800440 if (status & OE)
Bryan Wu194de562007-05-06 14:50:30 -0700441 uart->port.icount.overrun++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800442 if (status & FE)
Bryan Wu194de562007-05-06 14:50:30 -0700443 uart->port.icount.frame++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800444
445 status &= uart->port.read_status_mask;
446
447 if (status & BI)
448 flg = TTY_BREAK;
449 else if (status & PE)
450 flg = TTY_PARITY;
451 else if (status & FE)
452 flg = TTY_FRAME;
453 else
Bryan Wu194de562007-05-06 14:50:30 -0700454 flg = TTY_NORMAL;
455
456 for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
457 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
458 goto dma_ignore_char;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800459 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
Bryan Wu194de562007-05-06 14:50:30 -0700460 }
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800461
462 dma_ignore_char:
Bryan Wu194de562007-05-06 14:50:30 -0700463 tty_flip_buffer_push(tty);
464}
465
466void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
467{
468 int x_pos, pos;
469 int flags = 0;
470
Bryan Wu194de562007-05-06 14:50:30 -0700471 spin_lock_irqsave(&uart->port.lock, flags);
472 x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
473 if (x_pos == DMA_RX_XCOUNT)
474 x_pos = 0;
475
476 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
477
478 if (pos>uart->rx_dma_buf.tail) {
479 uart->rx_dma_buf.tail = pos;
480 bfin_serial_dma_rx_chars(uart);
481 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
482 }
483 spin_unlock_irqrestore(&uart->port.lock, flags);
484 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
485 add_timer(&(uart->rx_dma_timer));
486}
487
488static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
489{
490 struct bfin_serial_port *uart = dev_id;
491 struct circ_buf *xmit = &uart->port.info->xmit;
492 unsigned short ier;
493
494 spin_lock(&uart->port.lock);
495 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
496 clear_dma_irqstat(uart->tx_dma_channel);
497 disable_dma(uart->tx_dma_channel);
Roy Huangf4d640c92007-07-12 16:43:46 +0800498#ifdef CONFIG_BF54x
499 UART_CLEAR_IER(uart, ETBEI);
500#else
Bryan Wu194de562007-05-06 14:50:30 -0700501 ier = UART_GET_IER(uart);
502 ier &= ~ETBEI;
503 UART_PUT_IER(uart, ier);
Roy Huangf4d640c92007-07-12 16:43:46 +0800504#endif
Bryan Wu194de562007-05-06 14:50:30 -0700505 xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
506 uart->port.icount.tx+=uart->tx_count;
507
508 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
509 uart_write_wakeup(&uart->port);
510
Bryan Wu194de562007-05-06 14:50:30 -0700511 uart->tx_done = 1;
Sonic Zhang1b733512007-12-21 16:45:12 +0800512
513 bfin_serial_dma_tx_chars(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700514 }
515
516 spin_unlock(&uart->port.lock);
517 return IRQ_HANDLED;
518}
519
520static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
521{
522 struct bfin_serial_port *uart = dev_id;
523 unsigned short irqstat;
524
525 uart->rx_dma_nrows++;
526 if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
527 uart->rx_dma_nrows = 0;
528 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
529 bfin_serial_dma_rx_chars(uart);
530 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
531 }
532 spin_lock(&uart->port.lock);
533 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
534 clear_dma_irqstat(uart->rx_dma_channel);
535
536 spin_unlock(&uart->port.lock);
537 return IRQ_HANDLED;
538}
539#endif
540
541/*
542 * Return TIOCSER_TEMT when transmitter is not busy.
543 */
544static unsigned int bfin_serial_tx_empty(struct uart_port *port)
545{
546 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
547 unsigned short lsr;
548
549 lsr = UART_GET_LSR(uart);
550 if (lsr & TEMT)
551 return TIOCSER_TEMT;
552 else
553 return 0;
554}
555
556static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
557{
558#ifdef CONFIG_SERIAL_BFIN_CTSRTS
559 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
560 if (uart->cts_pin < 0)
561 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
562
563 if (gpio_get_value(uart->cts_pin))
564 return TIOCM_DSR | TIOCM_CAR;
565 else
566#endif
567 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
568}
569
570static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
571{
572#ifdef CONFIG_SERIAL_BFIN_CTSRTS
573 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
574 if (uart->rts_pin < 0)
575 return;
576
577 if (mctrl & TIOCM_RTS)
578 gpio_set_value(uart->rts_pin, 0);
579 else
580 gpio_set_value(uart->rts_pin, 1);
581#endif
582}
583
584/*
585 * Handle any change of modem status signal since we were last called.
586 */
587static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
588{
589#ifdef CONFIG_SERIAL_BFIN_CTSRTS
590 unsigned int status;
591# ifdef CONFIG_SERIAL_BFIN_DMA
592 struct uart_info *info = uart->port.info;
593 struct tty_struct *tty = info->tty;
594
595 status = bfin_serial_get_mctrl(&uart->port);
596 if (!(status & TIOCM_CTS)) {
597 tty->hw_stopped = 1;
598 } else {
599 tty->hw_stopped = 0;
600 }
601# else
602 status = bfin_serial_get_mctrl(&uart->port);
603 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
604 if (!(status & TIOCM_CTS))
605 schedule_work(&uart->cts_workqueue);
606# endif
607#endif
608}
609
610/*
611 * Interrupts are always disabled.
612 */
613static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
614{
Mike Frysingercf686762007-06-11 16:12:49 +0800615 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
616 u16 lcr = UART_GET_LCR(uart);
617 if (break_state)
618 lcr |= SB;
619 else
620 lcr &= ~SB;
621 UART_PUT_LCR(uart, lcr);
622 SSYNC();
Bryan Wu194de562007-05-06 14:50:30 -0700623}
624
625static int bfin_serial_startup(struct uart_port *port)
626{
627 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
628
629#ifdef CONFIG_SERIAL_BFIN_DMA
630 dma_addr_t dma_handle;
631
632 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
633 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
634 return -EBUSY;
635 }
636
637 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
638 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
639 free_dma(uart->rx_dma_channel);
640 return -EBUSY;
641 }
642
643 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
644 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
645
646 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
647 uart->rx_dma_buf.head = 0;
648 uart->rx_dma_buf.tail = 0;
649 uart->rx_dma_nrows = 0;
650
651 set_dma_config(uart->rx_dma_channel,
652 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
653 INTR_ON_ROW, DIMENSION_2D,
Michael Hennerich2047e402008-01-22 15:29:18 +0800654 DATA_SIZE_8,
655 DMA_SYNC_RESTART));
Bryan Wu194de562007-05-06 14:50:30 -0700656 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
657 set_dma_x_modify(uart->rx_dma_channel, 1);
658 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
659 set_dma_y_modify(uart->rx_dma_channel, 1);
660 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
661 enable_dma(uart->rx_dma_channel);
662
663 uart->rx_dma_timer.data = (unsigned long)(uart);
664 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
665 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
666 add_timer(&(uart->rx_dma_timer));
667#else
Sonic Zhanga359cca2007-10-10 16:47:58 +0800668 if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
Bryan Wu194de562007-05-06 14:50:30 -0700669 "BFIN_UART_RX", uart)) {
Sonic Zhanga359cca2007-10-10 16:47:58 +0800670# ifdef CONFIG_KGDB_UART
671 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
672# endif
Bryan Wu194de562007-05-06 14:50:30 -0700673 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
674 return -EBUSY;
Sonic Zhanga359cca2007-10-10 16:47:58 +0800675# ifdef CONFIG_KGDB_UART
676 }
677# endif
Bryan Wu194de562007-05-06 14:50:30 -0700678 }
679
Sonic Zhanga359cca2007-10-10 16:47:58 +0800680
Bryan Wu194de562007-05-06 14:50:30 -0700681 if (request_irq
Aubrey Li5c4e4722007-05-21 18:09:38 +0800682 (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
Bryan Wu194de562007-05-06 14:50:30 -0700683 "BFIN_UART_TX", uart)) {
684 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
685 free_irq(uart->port.irq, uart);
686 return -EBUSY;
687 }
688#endif
Roy Huangf4d640c92007-07-12 16:43:46 +0800689#ifdef CONFIG_BF54x
690 UART_SET_IER(uart, ERBFI);
691#else
Bryan Wu194de562007-05-06 14:50:30 -0700692 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
Roy Huangf4d640c92007-07-12 16:43:46 +0800693#endif
Bryan Wu194de562007-05-06 14:50:30 -0700694 return 0;
695}
696
697static void bfin_serial_shutdown(struct uart_port *port)
698{
699 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
700
701#ifdef CONFIG_SERIAL_BFIN_DMA
702 disable_dma(uart->tx_dma_channel);
703 free_dma(uart->tx_dma_channel);
704 disable_dma(uart->rx_dma_channel);
705 free_dma(uart->rx_dma_channel);
706 del_timer(&(uart->rx_dma_timer));
707#else
Sonic Zhang474f1a62007-06-29 16:35:17 +0800708#ifdef CONFIG_KGDB_UART
709 if (uart->port.line != CONFIG_KGDB_UART_PORT)
710#endif
Bryan Wu194de562007-05-06 14:50:30 -0700711 free_irq(uart->port.irq, uart);
712 free_irq(uart->port.irq+1, uart);
713#endif
714}
715
716static void
717bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
718 struct ktermios *old)
719{
720 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
721 unsigned long flags;
722 unsigned int baud, quot;
723 unsigned short val, ier, lsr, lcr = 0;
724
725 switch (termios->c_cflag & CSIZE) {
726 case CS8:
727 lcr = WLS(8);
728 break;
729 case CS7:
730 lcr = WLS(7);
731 break;
732 case CS6:
733 lcr = WLS(6);
734 break;
735 case CS5:
736 lcr = WLS(5);
737 break;
738 default:
739 printk(KERN_ERR "%s: word lengh not supported\n",
740 __FUNCTION__);
741 }
742
743 if (termios->c_cflag & CSTOPB)
744 lcr |= STB;
Mike Frysinger19aa6382007-06-11 16:16:45 +0800745 if (termios->c_cflag & PARENB)
Bryan Wu194de562007-05-06 14:50:30 -0700746 lcr |= PEN;
Mike Frysinger19aa6382007-06-11 16:16:45 +0800747 if (!(termios->c_cflag & PARODD))
748 lcr |= EPS;
749 if (termios->c_cflag & CMSPAR)
750 lcr |= STP;
Bryan Wu194de562007-05-06 14:50:30 -0700751
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800752 port->read_status_mask = OE;
753 if (termios->c_iflag & INPCK)
754 port->read_status_mask |= (FE | PE);
755 if (termios->c_iflag & (BRKINT | PARMRK))
756 port->read_status_mask |= BI;
Bryan Wu194de562007-05-06 14:50:30 -0700757
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800758 /*
759 * Characters to ignore
760 */
761 port->ignore_status_mask = 0;
762 if (termios->c_iflag & IGNPAR)
763 port->ignore_status_mask |= FE | PE;
764 if (termios->c_iflag & IGNBRK) {
765 port->ignore_status_mask |= BI;
766 /*
767 * If we're ignoring parity and break indicators,
768 * ignore overruns too (for real raw support).
769 */
770 if (termios->c_iflag & IGNPAR)
771 port->ignore_status_mask |= OE;
772 }
Bryan Wu194de562007-05-06 14:50:30 -0700773
774 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
775 quot = uart_get_divisor(port, baud);
776 spin_lock_irqsave(&uart->port.lock, flags);
777
778 do {
779 lsr = UART_GET_LSR(uart);
780 } while (!(lsr & TEMT));
781
782 /* Disable UART */
783 ier = UART_GET_IER(uart);
Roy Huangf4d640c92007-07-12 16:43:46 +0800784#ifdef CONFIG_BF54x
785 UART_CLEAR_IER(uart, 0xF);
786#else
Bryan Wu194de562007-05-06 14:50:30 -0700787 UART_PUT_IER(uart, 0);
Roy Huangf4d640c92007-07-12 16:43:46 +0800788#endif
Bryan Wu194de562007-05-06 14:50:30 -0700789
Roy Huangf4d640c92007-07-12 16:43:46 +0800790#ifndef CONFIG_BF54x
Bryan Wu194de562007-05-06 14:50:30 -0700791 /* Set DLAB in LCR to Access DLL and DLH */
792 val = UART_GET_LCR(uart);
793 val |= DLAB;
794 UART_PUT_LCR(uart, val);
795 SSYNC();
Roy Huangf4d640c92007-07-12 16:43:46 +0800796#endif
Bryan Wu194de562007-05-06 14:50:30 -0700797
798 UART_PUT_DLL(uart, quot & 0xFF);
799 SSYNC();
800 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
801 SSYNC();
802
Roy Huangf4d640c92007-07-12 16:43:46 +0800803#ifndef CONFIG_BF54x
Bryan Wu194de562007-05-06 14:50:30 -0700804 /* Clear DLAB in LCR to Access THR RBR IER */
805 val = UART_GET_LCR(uart);
806 val &= ~DLAB;
807 UART_PUT_LCR(uart, val);
808 SSYNC();
Roy Huangf4d640c92007-07-12 16:43:46 +0800809#endif
Bryan Wu194de562007-05-06 14:50:30 -0700810
811 UART_PUT_LCR(uart, lcr);
812
813 /* Enable UART */
Roy Huangf4d640c92007-07-12 16:43:46 +0800814#ifdef CONFIG_BF54x
815 UART_SET_IER(uart, ier);
816#else
Bryan Wu194de562007-05-06 14:50:30 -0700817 UART_PUT_IER(uart, ier);
Roy Huangf4d640c92007-07-12 16:43:46 +0800818#endif
Bryan Wu194de562007-05-06 14:50:30 -0700819
820 val = UART_GET_GCTL(uart);
821 val |= UCEN;
822 UART_PUT_GCTL(uart, val);
823
824 spin_unlock_irqrestore(&uart->port.lock, flags);
825}
826
827static const char *bfin_serial_type(struct uart_port *port)
828{
829 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
830
831 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
832}
833
834/*
835 * Release the memory region(s) being used by 'port'.
836 */
837static void bfin_serial_release_port(struct uart_port *port)
838{
839}
840
841/*
842 * Request the memory region(s) being used by 'port'.
843 */
844static int bfin_serial_request_port(struct uart_port *port)
845{
846 return 0;
847}
848
849/*
850 * Configure/autoconfigure the port.
851 */
852static void bfin_serial_config_port(struct uart_port *port, int flags)
853{
854 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
855
856 if (flags & UART_CONFIG_TYPE &&
857 bfin_serial_request_port(&uart->port) == 0)
858 uart->port.type = PORT_BFIN;
859}
860
861/*
862 * Verify the new serial_struct (for TIOCSSERIAL).
863 * The only change we allow are to the flags and type, and
864 * even then only between PORT_BFIN and PORT_UNKNOWN
865 */
866static int
867bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
868{
869 return 0;
870}
871
872static struct uart_ops bfin_serial_pops = {
873 .tx_empty = bfin_serial_tx_empty,
874 .set_mctrl = bfin_serial_set_mctrl,
875 .get_mctrl = bfin_serial_get_mctrl,
876 .stop_tx = bfin_serial_stop_tx,
877 .start_tx = bfin_serial_start_tx,
878 .stop_rx = bfin_serial_stop_rx,
879 .enable_ms = bfin_serial_enable_ms,
880 .break_ctl = bfin_serial_break_ctl,
881 .startup = bfin_serial_startup,
882 .shutdown = bfin_serial_shutdown,
883 .set_termios = bfin_serial_set_termios,
884 .type = bfin_serial_type,
885 .release_port = bfin_serial_release_port,
886 .request_port = bfin_serial_request_port,
887 .config_port = bfin_serial_config_port,
888 .verify_port = bfin_serial_verify_port,
889};
890
891static void __init bfin_serial_init_ports(void)
892{
893 static int first = 1;
894 int i;
895
896 if (!first)
897 return;
898 first = 0;
899
900 for (i = 0; i < nr_ports; i++) {
901 bfin_serial_ports[i].port.uartclk = get_sclk();
902 bfin_serial_ports[i].port.ops = &bfin_serial_pops;
903 bfin_serial_ports[i].port.line = i;
904 bfin_serial_ports[i].port.iotype = UPIO_MEM;
905 bfin_serial_ports[i].port.membase =
906 (void __iomem *)bfin_serial_resource[i].uart_base_addr;
907 bfin_serial_ports[i].port.mapbase =
908 bfin_serial_resource[i].uart_base_addr;
909 bfin_serial_ports[i].port.irq =
910 bfin_serial_resource[i].uart_irq;
911 bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF;
912#ifdef CONFIG_SERIAL_BFIN_DMA
913 bfin_serial_ports[i].tx_done = 1;
914 bfin_serial_ports[i].tx_count = 0;
915 bfin_serial_ports[i].tx_dma_channel =
916 bfin_serial_resource[i].uart_tx_dma_channel;
917 bfin_serial_ports[i].rx_dma_channel =
918 bfin_serial_resource[i].uart_rx_dma_channel;
919 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
920#else
921 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
922#endif
923#ifdef CONFIG_SERIAL_BFIN_CTSRTS
924 bfin_serial_ports[i].cts_pin =
925 bfin_serial_resource[i].uart_cts_pin;
926 bfin_serial_ports[i].rts_pin =
927 bfin_serial_resource[i].uart_rts_pin;
928#endif
929 bfin_serial_hw_init(&bfin_serial_ports[i]);
Bryan Wu194de562007-05-06 14:50:30 -0700930 }
Roy Huangf4d640c92007-07-12 16:43:46 +0800931
Bryan Wu194de562007-05-06 14:50:30 -0700932}
933
934#ifdef CONFIG_SERIAL_BFIN_CONSOLE
Bryan Wu194de562007-05-06 14:50:30 -0700935/*
936 * If the port was already initialised (eg, by a boot loader),
937 * try to determine the current setup.
938 */
939static void __init
940bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
941 int *parity, int *bits)
942{
943 unsigned short status;
944
945 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
946 if (status == (ERBFI | ETBEI)) {
947 /* ok, the port was enabled */
948 unsigned short lcr, val;
949 unsigned short dlh, dll;
950
951 lcr = UART_GET_LCR(uart);
952
953 *parity = 'n';
954 if (lcr & PEN) {
955 if (lcr & EPS)
956 *parity = 'e';
957 else
958 *parity = 'o';
959 }
960 switch (lcr & 0x03) {
961 case 0: *bits = 5; break;
962 case 1: *bits = 6; break;
963 case 2: *bits = 7; break;
964 case 3: *bits = 8; break;
965 }
Roy Huangf4d640c92007-07-12 16:43:46 +0800966#ifndef CONFIG_BF54x
Bryan Wu194de562007-05-06 14:50:30 -0700967 /* Set DLAB in LCR to Access DLL and DLH */
968 val = UART_GET_LCR(uart);
969 val |= DLAB;
970 UART_PUT_LCR(uart, val);
Roy Huangf4d640c92007-07-12 16:43:46 +0800971#endif
Bryan Wu194de562007-05-06 14:50:30 -0700972
973 dll = UART_GET_DLL(uart);
974 dlh = UART_GET_DLH(uart);
975
Roy Huangf4d640c92007-07-12 16:43:46 +0800976#ifndef CONFIG_BF54x
Bryan Wu194de562007-05-06 14:50:30 -0700977 /* Clear DLAB in LCR to Access THR RBR IER */
978 val = UART_GET_LCR(uart);
979 val &= ~DLAB;
980 UART_PUT_LCR(uart, val);
Roy Huangf4d640c92007-07-12 16:43:46 +0800981#endif
Bryan Wu194de562007-05-06 14:50:30 -0700982
983 *baud = get_sclk() / (16*(dll | dlh << 8));
984 }
985 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
986}
Robin Getz0ae53642007-10-09 17:24:49 +0800987#endif
988
989#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
990static struct uart_driver bfin_serial_reg;
Bryan Wu194de562007-05-06 14:50:30 -0700991
992static int __init
993bfin_serial_console_setup(struct console *co, char *options)
994{
995 struct bfin_serial_port *uart;
Robin Getz0ae53642007-10-09 17:24:49 +0800996# ifdef CONFIG_SERIAL_BFIN_CONSOLE
Bryan Wu194de562007-05-06 14:50:30 -0700997 int baud = 57600;
998 int bits = 8;
999 int parity = 'n';
Robin Getz0ae53642007-10-09 17:24:49 +08001000# ifdef CONFIG_SERIAL_BFIN_CTSRTS
Bryan Wu194de562007-05-06 14:50:30 -07001001 int flow = 'r';
Robin Getz0ae53642007-10-09 17:24:49 +08001002# else
Bryan Wu194de562007-05-06 14:50:30 -07001003 int flow = 'n';
Robin Getz0ae53642007-10-09 17:24:49 +08001004# endif
1005# endif
Bryan Wu194de562007-05-06 14:50:30 -07001006
1007 /*
1008 * Check whether an invalid uart number has been specified, and
1009 * if so, search for the first available port that does have
1010 * console support.
1011 */
1012 if (co->index == -1 || co->index >= nr_ports)
1013 co->index = 0;
1014 uart = &bfin_serial_ports[co->index];
1015
Robin Getz0ae53642007-10-09 17:24:49 +08001016# ifdef CONFIG_SERIAL_BFIN_CONSOLE
Bryan Wu194de562007-05-06 14:50:30 -07001017 if (options)
1018 uart_parse_options(options, &baud, &parity, &bits, &flow);
1019 else
1020 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1021
1022 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
Robin Getz0ae53642007-10-09 17:24:49 +08001023# else
1024 return 0;
1025# endif
1026}
1027#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1028 defined (CONFIG_EARLY_PRINTK) */
1029
1030#ifdef CONFIG_SERIAL_BFIN_CONSOLE
1031static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1032{
1033 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1034 while (!(UART_GET_LSR(uart) & THRE))
1035 barrier();
1036 UART_PUT_CHAR(uart, ch);
1037 SSYNC();
Bryan Wu194de562007-05-06 14:50:30 -07001038}
1039
Robin Getz0ae53642007-10-09 17:24:49 +08001040/*
1041 * Interrupts are disabled on entering
1042 */
1043static void
1044bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1045{
1046 struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1047 int flags = 0;
1048
1049 spin_lock_irqsave(&uart->port.lock, flags);
1050 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1051 spin_unlock_irqrestore(&uart->port.lock, flags);
1052
1053}
1054
Bryan Wu194de562007-05-06 14:50:30 -07001055static struct console bfin_serial_console = {
1056 .name = BFIN_SERIAL_NAME,
1057 .write = bfin_serial_console_write,
1058 .device = uart_console_device,
1059 .setup = bfin_serial_console_setup,
1060 .flags = CON_PRINTBUFFER,
1061 .index = -1,
1062 .data = &bfin_serial_reg,
1063};
1064
1065static int __init bfin_serial_rs_console_init(void)
1066{
1067 bfin_serial_init_ports();
1068 register_console(&bfin_serial_console);
Sonic Zhang474f1a62007-06-29 16:35:17 +08001069#ifdef CONFIG_KGDB_UART
1070 kgdb_entry_state = 0;
1071 init_kgdb_uart();
1072#endif
Bryan Wu194de562007-05-06 14:50:30 -07001073 return 0;
1074}
1075console_initcall(bfin_serial_rs_console_init);
1076
1077#define BFIN_SERIAL_CONSOLE &bfin_serial_console
1078#else
1079#define BFIN_SERIAL_CONSOLE NULL
Robin Getz0ae53642007-10-09 17:24:49 +08001080#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1081
1082
1083#ifdef CONFIG_EARLY_PRINTK
1084static __init void early_serial_putc(struct uart_port *port, int ch)
1085{
1086 unsigned timeout = 0xffff;
1087 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1088
1089 while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1090 cpu_relax();
1091 UART_PUT_CHAR(uart, ch);
1092}
1093
1094static __init void early_serial_write(struct console *con, const char *s,
1095 unsigned int n)
1096{
1097 struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1098 unsigned int i;
1099
1100 for (i = 0; i < n; i++, s++) {
1101 if (*s == '\n')
1102 early_serial_putc(&uart->port, '\r');
1103 early_serial_putc(&uart->port, *s);
1104 }
1105}
1106
1107static struct __init console bfin_early_serial_console = {
1108 .name = "early_BFuart",
1109 .write = early_serial_write,
1110 .device = uart_console_device,
1111 .flags = CON_PRINTBUFFER,
1112 .setup = bfin_serial_console_setup,
1113 .index = -1,
1114 .data = &bfin_serial_reg,
1115};
1116
1117struct console __init *bfin_earlyserial_init(unsigned int port,
1118 unsigned int cflag)
1119{
1120 struct bfin_serial_port *uart;
1121 struct ktermios t;
1122
1123 if (port == -1 || port >= nr_ports)
1124 port = 0;
1125 bfin_serial_init_ports();
1126 bfin_early_serial_console.index = port;
Robin Getz0ae53642007-10-09 17:24:49 +08001127 uart = &bfin_serial_ports[port];
1128 t.c_cflag = cflag;
1129 t.c_iflag = 0;
1130 t.c_oflag = 0;
1131 t.c_lflag = ICANON;
1132 t.c_line = port;
1133 bfin_serial_set_termios(&uart->port, &t, &t);
1134 return &bfin_early_serial_console;
1135}
1136
1137#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
Bryan Wu194de562007-05-06 14:50:30 -07001138
1139static struct uart_driver bfin_serial_reg = {
1140 .owner = THIS_MODULE,
1141 .driver_name = "bfin-uart",
1142 .dev_name = BFIN_SERIAL_NAME,
1143 .major = BFIN_SERIAL_MAJOR,
1144 .minor = BFIN_SERIAL_MINOR,
1145 .nr = NR_PORTS,
1146 .cons = BFIN_SERIAL_CONSOLE,
1147};
1148
1149static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1150{
1151 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1152
1153 if (uart)
1154 uart_suspend_port(&bfin_serial_reg, &uart->port);
1155
1156 return 0;
1157}
1158
1159static int bfin_serial_resume(struct platform_device *dev)
1160{
1161 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1162
1163 if (uart)
1164 uart_resume_port(&bfin_serial_reg, &uart->port);
1165
1166 return 0;
1167}
1168
1169static int bfin_serial_probe(struct platform_device *dev)
1170{
1171 struct resource *res = dev->resource;
1172 int i;
1173
1174 for (i = 0; i < dev->num_resources; i++, res++)
1175 if (res->flags & IORESOURCE_MEM)
1176 break;
1177
1178 if (i < dev->num_resources) {
1179 for (i = 0; i < nr_ports; i++, res++) {
1180 if (bfin_serial_ports[i].port.mapbase != res->start)
1181 continue;
1182 bfin_serial_ports[i].port.dev = &dev->dev;
1183 uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1184 platform_set_drvdata(dev, &bfin_serial_ports[i]);
1185 }
1186 }
1187
1188 return 0;
1189}
1190
1191static int bfin_serial_remove(struct platform_device *pdev)
1192{
1193 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1194
1195
1196#ifdef CONFIG_SERIAL_BFIN_CTSRTS
1197 gpio_free(uart->cts_pin);
1198 gpio_free(uart->rts_pin);
1199#endif
1200
1201 platform_set_drvdata(pdev, NULL);
1202
1203 if (uart)
1204 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1205
1206 return 0;
1207}
1208
1209static struct platform_driver bfin_serial_driver = {
1210 .probe = bfin_serial_probe,
1211 .remove = bfin_serial_remove,
1212 .suspend = bfin_serial_suspend,
1213 .resume = bfin_serial_resume,
1214 .driver = {
1215 .name = "bfin-uart",
1216 },
1217};
1218
1219static int __init bfin_serial_init(void)
1220{
1221 int ret;
Sonic Zhang474f1a62007-06-29 16:35:17 +08001222#ifdef CONFIG_KGDB_UART
1223 struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
Sonic Zhanga359cca2007-10-10 16:47:58 +08001224 struct ktermios t;
Sonic Zhang474f1a62007-06-29 16:35:17 +08001225#endif
Bryan Wu194de562007-05-06 14:50:30 -07001226
1227 pr_info("Serial: Blackfin serial driver\n");
1228
1229 bfin_serial_init_ports();
1230
1231 ret = uart_register_driver(&bfin_serial_reg);
1232 if (ret == 0) {
1233 ret = platform_driver_register(&bfin_serial_driver);
1234 if (ret) {
1235 pr_debug("uart register failed\n");
1236 uart_unregister_driver(&bfin_serial_reg);
1237 }
1238 }
Sonic Zhang474f1a62007-06-29 16:35:17 +08001239#ifdef CONFIG_KGDB_UART
1240 if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
Sonic Zhanga359cca2007-10-10 16:47:58 +08001241 request_irq(uart->port.irq, bfin_serial_rx_int,
Sonic Zhang474f1a62007-06-29 16:35:17 +08001242 IRQF_DISABLED, "BFIN_UART_RX", uart);
1243 pr_info("Request irq for kgdb uart port\n");
Sonic Zhanga359cca2007-10-10 16:47:58 +08001244#ifdef CONFIG_BF54x
1245 UART_SET_IER(uart, ERBFI);
1246#else
Sonic Zhang474f1a62007-06-29 16:35:17 +08001247 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
Sonic Zhanga359cca2007-10-10 16:47:58 +08001248#endif
Mike Frysingerd5148ff2007-07-25 11:57:42 +08001249 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +08001250 t.c_cflag = CS8|B57600;
1251 t.c_iflag = 0;
1252 t.c_oflag = 0;
1253 t.c_lflag = ICANON;
1254 t.c_line = CONFIG_KGDB_UART_PORT;
1255 bfin_serial_set_termios(&uart->port, &t, &t);
1256 }
1257#endif
Bryan Wu194de562007-05-06 14:50:30 -07001258 return ret;
1259}
1260
1261static void __exit bfin_serial_exit(void)
1262{
1263 platform_driver_unregister(&bfin_serial_driver);
1264 uart_unregister_driver(&bfin_serial_reg);
1265}
1266
1267module_init(bfin_serial_init);
1268module_exit(bfin_serial_exit);
1269
1270MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1271MODULE_DESCRIPTION("Blackfin generic serial port driver");
1272MODULE_LICENSE("GPL");
1273MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);