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Bryan Wu194de562007-05-06 14:50:30 -07001/*
Mike Frysinger1ba7a3e2008-01-11 15:56:26 +08002 * Blackfin On-Chip Serial Driver
Bryan Wu194de562007-05-06 14:50:30 -07003 *
Mike Frysinger1ba7a3e2008-01-11 15:56:26 +08004 * Copyright 2006-2007 Analog Devices Inc.
Bryan Wu194de562007-05-06 14:50:30 -07005 *
Mike Frysinger1ba7a3e2008-01-11 15:56:26 +08006 * Enter bugs at http://blackfin.uclinux.org/
Bryan Wu194de562007-05-06 14:50:30 -07007 *
Mike Frysinger1ba7a3e2008-01-11 15:56:26 +08008 * Licensed under the GPL-2 or later.
Bryan Wu194de562007-05-06 14:50:30 -07009 */
10
11#if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
12#define SUPPORT_SYSRQ
13#endif
14
15#include <linux/module.h>
16#include <linux/ioport.h>
17#include <linux/init.h>
18#include <linux/console.h>
19#include <linux/sysrq.h>
20#include <linux/platform_device.h>
21#include <linux/tty.h>
22#include <linux/tty_flip.h>
23#include <linux/serial_core.h>
24
Sonic Zhang474f1a62007-06-29 16:35:17 +080025#ifdef CONFIG_KGDB_UART
26#include <linux/kgdb.h>
27#include <asm/irq_regs.h>
28#endif
29
Bryan Wu194de562007-05-06 14:50:30 -070030#include <asm/gpio.h>
31#include <asm/mach/bfin_serial_5xx.h>
32
33#ifdef CONFIG_SERIAL_BFIN_DMA
34#include <linux/dma-mapping.h>
35#include <asm/io.h>
36#include <asm/irq.h>
37#include <asm/cacheflush.h>
38#endif
39
40/* UART name and device definitions */
41#define BFIN_SERIAL_NAME "ttyBF"
42#define BFIN_SERIAL_MAJOR 204
43#define BFIN_SERIAL_MINOR 64
44
45/*
46 * Setup for console. Argument comes from the menuconfig
47 */
48#define DMA_RX_XCOUNT 512
49#define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
50
Sonic Zhang0aef4562008-02-29 12:08:42 +080051#define DMA_RX_FLUSH_JIFFIES (HZ / 50)
Bryan Wu194de562007-05-06 14:50:30 -070052
53#ifdef CONFIG_SERIAL_BFIN_DMA
54static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
55#else
Bryan Wu194de562007-05-06 14:50:30 -070056static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
Bryan Wu194de562007-05-06 14:50:30 -070057#endif
58
59static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
60
61/*
62 * interrupts are disabled on entry
63 */
64static void bfin_serial_stop_tx(struct uart_port *port)
65{
66 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
Sonic Zhang0711d852008-02-25 15:16:50 +080067 struct circ_buf *xmit = &uart->port.info->xmit;
Bryan Wu194de562007-05-06 14:50:30 -070068
Roy Huangf4d640c92007-07-12 16:43:46 +080069 while (!(UART_GET_LSR(uart) & TEMT))
Sonic Zhang0711d852008-02-25 15:16:50 +080070 cpu_relax();
Roy Huangf4d640c92007-07-12 16:43:46 +080071
Bryan Wu194de562007-05-06 14:50:30 -070072#ifdef CONFIG_SERIAL_BFIN_DMA
73 disable_dma(uart->tx_dma_channel);
Sonic Zhang0711d852008-02-25 15:16:50 +080074 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
75 uart->port.icount.tx += uart->tx_count;
76 uart->tx_count = 0;
77 uart->tx_done = 1;
Bryan Wu194de562007-05-06 14:50:30 -070078#else
Roy Huangf4d640c92007-07-12 16:43:46 +080079#ifdef CONFIG_BF54x
Roy Huangf4d640c92007-07-12 16:43:46 +080080 /* Clear TFI bit */
81 UART_PUT_LSR(uart, TFI);
Bryan Wu194de562007-05-06 14:50:30 -070082#endif
Mike Frysinger89bf6dc52008-05-07 11:41:26 +080083 UART_CLEAR_IER(uart, ETBEI);
Roy Huangf4d640c92007-07-12 16:43:46 +080084#endif
Bryan Wu194de562007-05-06 14:50:30 -070085}
86
87/*
88 * port is locked and interrupts are disabled
89 */
90static void bfin_serial_start_tx(struct uart_port *port)
91{
92 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
93
94#ifdef CONFIG_SERIAL_BFIN_DMA
Sonic Zhang0711d852008-02-25 15:16:50 +080095 if (uart->tx_done)
96 bfin_serial_dma_tx_chars(uart);
Bryan Wu194de562007-05-06 14:50:30 -070097#else
Roy Huangf4d640c92007-07-12 16:43:46 +080098 UART_SET_IER(uart, ETBEI);
Sonic Zhanga359cca2007-10-10 16:47:58 +080099 bfin_serial_tx_chars(uart);
Roy Huangf4d640c92007-07-12 16:43:46 +0800100#endif
Bryan Wu194de562007-05-06 14:50:30 -0700101}
102
103/*
104 * Interrupts are enabled
105 */
106static void bfin_serial_stop_rx(struct uart_port *port)
107{
108 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
Mike Frysinger89bf6dc52008-05-07 11:41:26 +0800109#ifdef CONFIG_KGDB_UART
110 if (uart->port.line != CONFIG_KGDB_UART_PORT)
Sonic Zhanga359cca2007-10-10 16:47:58 +0800111#endif
Roy Huangf4d640c92007-07-12 16:43:46 +0800112 UART_CLEAR_IER(uart, ERBFI);
Bryan Wu194de562007-05-06 14:50:30 -0700113}
114
115/*
116 * Set the modem control timer to fire immediately.
117 */
118static void bfin_serial_enable_ms(struct uart_port *port)
119{
120}
121
Sonic Zhang474f1a62007-06-29 16:35:17 +0800122#ifdef CONFIG_KGDB_UART
123static int kgdb_entry_state;
124
125void kgdb_put_debug_char(int chr)
126{
127 struct bfin_serial_port *uart;
128
Graf Yang2ade9722008-04-25 02:55:49 +0800129 if (CONFIG_KGDB_UART_PORT < 0
130 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
Sonic Zhang474f1a62007-06-29 16:35:17 +0800131 uart = &bfin_serial_ports[0];
132 else
133 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
134
135 while (!(UART_GET_LSR(uart) & THRE)) {
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800136 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800137 }
Sonic Zhanga359cca2007-10-10 16:47:58 +0800138
Mike Frysinger45828b82008-05-07 11:41:26 +0800139 UART_CLEAR_DLAB(uart);
Sonic Zhang474f1a62007-06-29 16:35:17 +0800140 UART_PUT_CHAR(uart, (unsigned char)chr);
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800141 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800142}
143
144int kgdb_get_debug_char(void)
145{
146 struct bfin_serial_port *uart;
147 unsigned char chr;
148
Graf Yang2ade9722008-04-25 02:55:49 +0800149 if (CONFIG_KGDB_UART_PORT < 0
150 || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)
Sonic Zhang474f1a62007-06-29 16:35:17 +0800151 uart = &bfin_serial_ports[0];
152 else
153 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
154
155 while(!(UART_GET_LSR(uart) & DR)) {
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800156 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800157 }
Mike Frysinger45828b82008-05-07 11:41:26 +0800158 UART_CLEAR_DLAB(uart);
Sonic Zhang474f1a62007-06-29 16:35:17 +0800159 chr = UART_GET_CHAR(uart);
Mike Frysingerd5148ff2007-07-25 11:57:42 +0800160 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800161
162 return chr;
163}
164#endif
165
Mike Frysinger50e2e152008-04-25 03:03:03 +0800166#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
Mike Frysinger8851c712007-12-24 19:48:04 +0800167# define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
168# define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
169#else
170# define UART_GET_ANOMALY_THRESHOLD(uart) 0
171# define UART_SET_ANOMALY_THRESHOLD(uart, v)
172#endif
173
Bryan Wu194de562007-05-06 14:50:30 -0700174#ifdef CONFIG_SERIAL_BFIN_PIO
Bryan Wu194de562007-05-06 14:50:30 -0700175static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
176{
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800177 struct tty_struct *tty = uart->port.info->tty;
Bryan Wu194de562007-05-06 14:50:30 -0700178 unsigned int status, ch, flg;
Mike Frysinger8851c712007-12-24 19:48:04 +0800179 static struct timeval anomaly_start = { .tv_sec = 0 };
Bryan Wu194de562007-05-06 14:50:30 -0700180
Sonic Zhang759eb042007-11-21 17:00:32 +0800181 status = UART_GET_LSR(uart);
Mike Frysinger0bcfd702007-12-24 19:40:05 +0800182 UART_CLEAR_LSR(uart);
183
184 ch = UART_GET_CHAR(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700185 uart->port.icount.rx++;
186
Sonic Zhang474f1a62007-06-29 16:35:17 +0800187#ifdef CONFIG_KGDB_UART
188 if (uart->port.line == CONFIG_KGDB_UART_PORT) {
Mike Frysinger89bf6dc52008-05-07 11:41:26 +0800189 struct pt_regs *regs = get_irq_regs();
Sonic Zhang474f1a62007-06-29 16:35:17 +0800190 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
191 kgdb_breakkey_pressed(regs);
192 return;
193 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
194 kgdb_entry_state = 1;
195 } else if (kgdb_entry_state == 1 && ch == 'q') {
196 kgdb_entry_state = 0;
197 kgdb_breakkey_pressed(regs);
198 return;
199 } else if (ch == 0x3) {/* Ctrl + C */
200 kgdb_entry_state = 0;
201 kgdb_breakkey_pressed(regs);
202 return;
203 } else {
204 kgdb_entry_state = 0;
205 }
206 }
207#endif
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800208
Mike Frysinger50e2e152008-04-25 03:03:03 +0800209 if (ANOMALY_05000363) {
Mike Frysinger8851c712007-12-24 19:48:04 +0800210 /* The BF533 (and BF561) family of processors have a nice anomaly
211 * where they continuously generate characters for a "single" break.
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800212 * We have to basically ignore this flood until the "next" valid
Mike Frysinger8851c712007-12-24 19:48:04 +0800213 * character comes across. Due to the nature of the flood, it is
214 * not possible to reliably catch bytes that are sent too quickly
215 * after this break. So application code talking to the Blackfin
216 * which sends a break signal must allow at least 1.5 character
217 * times after the end of the break for things to stabilize. This
218 * timeout was picked as it must absolutely be larger than 1
219 * character time +/- some percent. So 1.5 sounds good. All other
220 * Blackfin families operate properly. Woo.
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800221 */
Mike Frysinger8851c712007-12-24 19:48:04 +0800222 if (anomaly_start.tv_sec) {
223 struct timeval curr;
224 suseconds_t usecs;
225
226 if ((~ch & (~ch + 1)) & 0xff)
227 goto known_good_char;
228
229 do_gettimeofday(&curr);
230 if (curr.tv_sec - anomaly_start.tv_sec > 1)
231 goto known_good_char;
232
233 usecs = 0;
234 if (curr.tv_sec != anomaly_start.tv_sec)
235 usecs += USEC_PER_SEC;
236 usecs += curr.tv_usec - anomaly_start.tv_usec;
237
238 if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
239 goto known_good_char;
240
241 if (ch)
242 anomaly_start.tv_sec = 0;
243 else
244 anomaly_start = curr;
245
246 return;
247
248 known_good_char:
249 anomaly_start.tv_sec = 0;
Mike Frysingerbbf275f2007-08-05 16:48:08 +0800250 }
Bryan Wu194de562007-05-06 14:50:30 -0700251 }
Bryan Wu194de562007-05-06 14:50:30 -0700252
253 if (status & BI) {
Mike Frysinger50e2e152008-04-25 03:03:03 +0800254 if (ANOMALY_05000363)
Mike Frysinger8851c712007-12-24 19:48:04 +0800255 if (bfin_revid() < 5)
256 do_gettimeofday(&anomaly_start);
Bryan Wu194de562007-05-06 14:50:30 -0700257 uart->port.icount.brk++;
258 if (uart_handle_break(&uart->port))
259 goto ignore_char;
Mike Frysinger98089012007-06-11 15:31:30 +0800260 status &= ~(PE | FE);
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800261 }
262 if (status & PE)
Bryan Wu194de562007-05-06 14:50:30 -0700263 uart->port.icount.parity++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800264 if (status & OE)
Bryan Wu194de562007-05-06 14:50:30 -0700265 uart->port.icount.overrun++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800266 if (status & FE)
Bryan Wu194de562007-05-06 14:50:30 -0700267 uart->port.icount.frame++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800268
269 status &= uart->port.read_status_mask;
270
271 if (status & BI)
272 flg = TTY_BREAK;
273 else if (status & PE)
274 flg = TTY_PARITY;
275 else if (status & FE)
276 flg = TTY_FRAME;
277 else
Bryan Wu194de562007-05-06 14:50:30 -0700278 flg = TTY_NORMAL;
279
280 if (uart_handle_sysrq_char(&uart->port, ch))
281 goto ignore_char;
Bryan Wu194de562007-05-06 14:50:30 -0700282
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800283 uart_insert_char(&uart->port, status, OE, ch, flg);
284
285 ignore_char:
286 tty_flip_buffer_push(tty);
Bryan Wu194de562007-05-06 14:50:30 -0700287}
288
289static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
290{
291 struct circ_buf *xmit = &uart->port.info->xmit;
292
293 if (uart->port.x_char) {
294 UART_PUT_CHAR(uart, uart->port.x_char);
295 uart->port.icount.tx++;
296 uart->port.x_char = 0;
Bryan Wu194de562007-05-06 14:50:30 -0700297 }
298 /*
299 * Check the modem control lines before
300 * transmitting anything.
301 */
302 bfin_serial_mctrl_check(uart);
303
304 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
305 bfin_serial_stop_tx(&uart->port);
306 return;
307 }
308
Sonic Zhang759eb042007-11-21 17:00:32 +0800309 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
310 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
311 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
312 uart->port.icount.tx++;
313 SSYNC();
314 }
Bryan Wu194de562007-05-06 14:50:30 -0700315
316 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
317 uart_write_wakeup(&uart->port);
318
319 if (uart_circ_empty(xmit))
320 bfin_serial_stop_tx(&uart->port);
321}
322
Aubrey Li5c4e4722007-05-21 18:09:38 +0800323static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
324{
325 struct bfin_serial_port *uart = dev_id;
326
Roy Huangf4d640c92007-07-12 16:43:46 +0800327 spin_lock(&uart->port.lock);
Mike Frysinger0bcfd702007-12-24 19:40:05 +0800328 while (UART_GET_LSR(uart) & DR)
Aubrey Li5c4e4722007-05-21 18:09:38 +0800329 bfin_serial_rx_chars(uart);
330 spin_unlock(&uart->port.lock);
Sonic Zhang759eb042007-11-21 17:00:32 +0800331
Aubrey Li5c4e4722007-05-21 18:09:38 +0800332 return IRQ_HANDLED;
333}
334
335static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
Bryan Wu194de562007-05-06 14:50:30 -0700336{
337 struct bfin_serial_port *uart = dev_id;
Bryan Wu194de562007-05-06 14:50:30 -0700338
Roy Huangf4d640c92007-07-12 16:43:46 +0800339 spin_lock(&uart->port.lock);
Mike Frysinger0bcfd702007-12-24 19:40:05 +0800340 if (UART_GET_LSR(uart) & THRE)
Aubrey Li5c4e4722007-05-21 18:09:38 +0800341 bfin_serial_tx_chars(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700342 spin_unlock(&uart->port.lock);
Sonic Zhang759eb042007-11-21 17:00:32 +0800343
Bryan Wu194de562007-05-06 14:50:30 -0700344 return IRQ_HANDLED;
345}
Sonic Zhang4cb4f222008-02-02 14:29:25 +0800346#endif
Bryan Wu194de562007-05-06 14:50:30 -0700347
Sonic Zhang4cb4f222008-02-02 14:29:25 +0800348#ifdef CONFIG_SERIAL_BFIN_CTSRTS
Bryan Wu194de562007-05-06 14:50:30 -0700349static void bfin_serial_do_work(struct work_struct *work)
350{
351 struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
352
353 bfin_serial_mctrl_check(uart);
354}
Bryan Wu194de562007-05-06 14:50:30 -0700355#endif
356
357#ifdef CONFIG_SERIAL_BFIN_DMA
358static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
359{
360 struct circ_buf *xmit = &uart->port.info->xmit;
Bryan Wu194de562007-05-06 14:50:30 -0700361
Bryan Wu194de562007-05-06 14:50:30 -0700362 uart->tx_done = 0;
363
Bryan Wu194de562007-05-06 14:50:30 -0700364 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
Sonic Zhang0711d852008-02-25 15:16:50 +0800365 uart->tx_count = 0;
Bryan Wu194de562007-05-06 14:50:30 -0700366 uart->tx_done = 1;
367 return;
368 }
369
Sonic Zhang1b733512007-12-21 16:45:12 +0800370 if (uart->port.x_char) {
371 UART_PUT_CHAR(uart, uart->port.x_char);
372 uart->port.icount.tx++;
373 uart->port.x_char = 0;
374 }
375
376 /*
377 * Check the modem control lines before
378 * transmitting anything.
379 */
380 bfin_serial_mctrl_check(uart);
381
Bryan Wu194de562007-05-06 14:50:30 -0700382 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
383 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
384 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
385 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
386 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
387 set_dma_config(uart->tx_dma_channel,
388 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
389 INTR_ON_BUF,
390 DIMENSION_LINEAR,
Michael Hennerich2047e402008-01-22 15:29:18 +0800391 DATA_SIZE_8,
392 DMA_SYNC_RESTART));
Bryan Wu194de562007-05-06 14:50:30 -0700393 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
394 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
395 set_dma_x_modify(uart->tx_dma_channel, 1);
396 enable_dma(uart->tx_dma_channel);
Sonic Zhang99ee7b52007-12-21 17:12:55 +0800397
Roy Huangf4d640c92007-07-12 16:43:46 +0800398 UART_SET_IER(uart, ETBEI);
Bryan Wu194de562007-05-06 14:50:30 -0700399}
400
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800401static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
Bryan Wu194de562007-05-06 14:50:30 -0700402{
403 struct tty_struct *tty = uart->port.info->tty;
404 int i, flg, status;
405
406 status = UART_GET_LSR(uart);
Mike Frysinger0bcfd702007-12-24 19:40:05 +0800407 UART_CLEAR_LSR(uart);
408
Sonic Zhang56f5de82008-02-25 15:19:09 +0800409 uart->port.icount.rx +=
410 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
411 UART_XMIT_SIZE);
Bryan Wu194de562007-05-06 14:50:30 -0700412
413 if (status & BI) {
414 uart->port.icount.brk++;
415 if (uart_handle_break(&uart->port))
416 goto dma_ignore_char;
Mike Frysinger98089012007-06-11 15:31:30 +0800417 status &= ~(PE | FE);
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800418 }
419 if (status & PE)
Bryan Wu194de562007-05-06 14:50:30 -0700420 uart->port.icount.parity++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800421 if (status & OE)
Bryan Wu194de562007-05-06 14:50:30 -0700422 uart->port.icount.overrun++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800423 if (status & FE)
Bryan Wu194de562007-05-06 14:50:30 -0700424 uart->port.icount.frame++;
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800425
426 status &= uart->port.read_status_mask;
427
428 if (status & BI)
429 flg = TTY_BREAK;
430 else if (status & PE)
431 flg = TTY_PARITY;
432 else if (status & FE)
433 flg = TTY_FRAME;
434 else
Bryan Wu194de562007-05-06 14:50:30 -0700435 flg = TTY_NORMAL;
436
Sonic Zhang56f5de82008-02-25 15:19:09 +0800437 for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
438 if (i >= UART_XMIT_SIZE)
439 i = 0;
440 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
441 uart_insert_char(&uart->port, status, OE,
442 uart->rx_dma_buf.buf[i], flg);
Bryan Wu194de562007-05-06 14:50:30 -0700443 }
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800444
445 dma_ignore_char:
Bryan Wu194de562007-05-06 14:50:30 -0700446 tty_flip_buffer_push(tty);
447}
448
449void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
450{
451 int x_pos, pos;
Bryan Wu194de562007-05-06 14:50:30 -0700452
Sonic Zhang56f5de82008-02-25 15:19:09 +0800453 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
454 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
455 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
456 if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
457 uart->rx_dma_nrows = 0;
458 x_pos = DMA_RX_XCOUNT - x_pos;
Bryan Wu194de562007-05-06 14:50:30 -0700459 if (x_pos == DMA_RX_XCOUNT)
460 x_pos = 0;
461
462 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
Sonic Zhang56f5de82008-02-25 15:19:09 +0800463 if (pos != uart->rx_dma_buf.tail) {
464 uart->rx_dma_buf.head = pos;
Bryan Wu194de562007-05-06 14:50:30 -0700465 bfin_serial_dma_rx_chars(uart);
Sonic Zhang56f5de82008-02-25 15:19:09 +0800466 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
Bryan Wu194de562007-05-06 14:50:30 -0700467 }
Sonic Zhang0aef4562008-02-29 12:08:42 +0800468
Sonic Zhang0a278422008-04-25 04:36:47 +0800469 mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
Bryan Wu194de562007-05-06 14:50:30 -0700470}
471
472static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
473{
474 struct bfin_serial_port *uart = dev_id;
475 struct circ_buf *xmit = &uart->port.info->xmit;
Bryan Wu194de562007-05-06 14:50:30 -0700476
477 spin_lock(&uart->port.lock);
478 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
Bryan Wu194de562007-05-06 14:50:30 -0700479 disable_dma(uart->tx_dma_channel);
Sonic Zhang0711d852008-02-25 15:16:50 +0800480 clear_dma_irqstat(uart->tx_dma_channel);
Roy Huangf4d640c92007-07-12 16:43:46 +0800481 UART_CLEAR_IER(uart, ETBEI);
Sonic Zhang0711d852008-02-25 15:16:50 +0800482 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
483 uart->port.icount.tx += uart->tx_count;
Sonic Zhang1b733512007-12-21 16:45:12 +0800484
Sonic Zhang56f5de82008-02-25 15:19:09 +0800485 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
486 uart_write_wakeup(&uart->port);
487
Sonic Zhang1b733512007-12-21 16:45:12 +0800488 bfin_serial_dma_tx_chars(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700489 }
490
491 spin_unlock(&uart->port.lock);
492 return IRQ_HANDLED;
493}
494
495static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
496{
497 struct bfin_serial_port *uart = dev_id;
498 unsigned short irqstat;
Sonic Zhang0711d852008-02-25 15:16:50 +0800499
Bryan Wu194de562007-05-06 14:50:30 -0700500 spin_lock(&uart->port.lock);
501 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
502 clear_dma_irqstat(uart->rx_dma_channel);
Bryan Wu194de562007-05-06 14:50:30 -0700503 spin_unlock(&uart->port.lock);
Sonic Zhang0aef4562008-02-29 12:08:42 +0800504
Sonic Zhang0a278422008-04-25 04:36:47 +0800505 mod_timer(&(uart->rx_dma_timer), jiffies);
Sonic Zhang0aef4562008-02-29 12:08:42 +0800506
Bryan Wu194de562007-05-06 14:50:30 -0700507 return IRQ_HANDLED;
508}
509#endif
510
511/*
512 * Return TIOCSER_TEMT when transmitter is not busy.
513 */
514static unsigned int bfin_serial_tx_empty(struct uart_port *port)
515{
516 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
517 unsigned short lsr;
518
519 lsr = UART_GET_LSR(uart);
520 if (lsr & TEMT)
521 return TIOCSER_TEMT;
522 else
523 return 0;
524}
525
526static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
527{
528#ifdef CONFIG_SERIAL_BFIN_CTSRTS
529 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
530 if (uart->cts_pin < 0)
531 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
532
Sonic Zhangdb288382008-02-02 17:05:02 +0800533# ifdef BF54x
534 if (UART_GET_MSR(uart) & CTS)
535# else
Bryan Wu194de562007-05-06 14:50:30 -0700536 if (gpio_get_value(uart->cts_pin))
Sonic Zhangdb288382008-02-02 17:05:02 +0800537# endif
Bryan Wu194de562007-05-06 14:50:30 -0700538 return TIOCM_DSR | TIOCM_CAR;
539 else
540#endif
541 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
542}
543
544static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
545{
546#ifdef CONFIG_SERIAL_BFIN_CTSRTS
547 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
548 if (uart->rts_pin < 0)
549 return;
550
551 if (mctrl & TIOCM_RTS)
Sonic Zhangdb288382008-02-02 17:05:02 +0800552# ifdef BF54x
553 UART_PUT_MCR(uart, UART_GET_MCR(uart) & ~MRTS);
554# else
Bryan Wu194de562007-05-06 14:50:30 -0700555 gpio_set_value(uart->rts_pin, 0);
Sonic Zhangdb288382008-02-02 17:05:02 +0800556# endif
Bryan Wu194de562007-05-06 14:50:30 -0700557 else
Sonic Zhangdb288382008-02-02 17:05:02 +0800558# ifdef BF54x
559 UART_PUT_MCR(uart, UART_GET_MCR(uart) | MRTS);
560# else
Bryan Wu194de562007-05-06 14:50:30 -0700561 gpio_set_value(uart->rts_pin, 1);
Sonic Zhangdb288382008-02-02 17:05:02 +0800562# endif
Bryan Wu194de562007-05-06 14:50:30 -0700563#endif
564}
565
566/*
567 * Handle any change of modem status signal since we were last called.
568 */
569static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
570{
571#ifdef CONFIG_SERIAL_BFIN_CTSRTS
572 unsigned int status;
Bryan Wu194de562007-05-06 14:50:30 -0700573 struct uart_info *info = uart->port.info;
574 struct tty_struct *tty = info->tty;
575
576 status = bfin_serial_get_mctrl(&uart->port);
Sonic Zhang4cb4f222008-02-02 14:29:25 +0800577 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
Bryan Wu194de562007-05-06 14:50:30 -0700578 if (!(status & TIOCM_CTS)) {
579 tty->hw_stopped = 1;
Sonic Zhang4cb4f222008-02-02 14:29:25 +0800580 schedule_work(&uart->cts_workqueue);
Bryan Wu194de562007-05-06 14:50:30 -0700581 } else {
582 tty->hw_stopped = 0;
583 }
Bryan Wu194de562007-05-06 14:50:30 -0700584#endif
585}
586
587/*
588 * Interrupts are always disabled.
589 */
590static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
591{
Mike Frysingercf686762007-06-11 16:12:49 +0800592 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
593 u16 lcr = UART_GET_LCR(uart);
594 if (break_state)
595 lcr |= SB;
596 else
597 lcr &= ~SB;
598 UART_PUT_LCR(uart, lcr);
599 SSYNC();
Bryan Wu194de562007-05-06 14:50:30 -0700600}
601
602static int bfin_serial_startup(struct uart_port *port)
603{
604 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
605
606#ifdef CONFIG_SERIAL_BFIN_DMA
607 dma_addr_t dma_handle;
608
609 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
610 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
611 return -EBUSY;
612 }
613
614 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
615 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
616 free_dma(uart->rx_dma_channel);
617 return -EBUSY;
618 }
619
620 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
621 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
622
623 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
624 uart->rx_dma_buf.head = 0;
625 uart->rx_dma_buf.tail = 0;
626 uart->rx_dma_nrows = 0;
627
628 set_dma_config(uart->rx_dma_channel,
629 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
630 INTR_ON_ROW, DIMENSION_2D,
Michael Hennerich2047e402008-01-22 15:29:18 +0800631 DATA_SIZE_8,
632 DMA_SYNC_RESTART));
Bryan Wu194de562007-05-06 14:50:30 -0700633 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
634 set_dma_x_modify(uart->rx_dma_channel, 1);
635 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
636 set_dma_y_modify(uart->rx_dma_channel, 1);
637 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
638 enable_dma(uart->rx_dma_channel);
639
640 uart->rx_dma_timer.data = (unsigned long)(uart);
641 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
642 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
643 add_timer(&(uart->rx_dma_timer));
644#else
Sonic Zhanga359cca2007-10-10 16:47:58 +0800645 if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
Bryan Wu194de562007-05-06 14:50:30 -0700646 "BFIN_UART_RX", uart)) {
Sonic Zhanga359cca2007-10-10 16:47:58 +0800647# ifdef CONFIG_KGDB_UART
648 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
649# endif
Bryan Wu194de562007-05-06 14:50:30 -0700650 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
651 return -EBUSY;
Sonic Zhanga359cca2007-10-10 16:47:58 +0800652# ifdef CONFIG_KGDB_UART
653 }
654# endif
Bryan Wu194de562007-05-06 14:50:30 -0700655 }
656
657 if (request_irq
Aubrey Li5c4e4722007-05-21 18:09:38 +0800658 (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
Bryan Wu194de562007-05-06 14:50:30 -0700659 "BFIN_UART_TX", uart)) {
660 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
661 free_irq(uart->port.irq, uart);
662 return -EBUSY;
663 }
664#endif
Roy Huangf4d640c92007-07-12 16:43:46 +0800665 UART_SET_IER(uart, ERBFI);
Bryan Wu194de562007-05-06 14:50:30 -0700666 return 0;
667}
668
669static void bfin_serial_shutdown(struct uart_port *port)
670{
671 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
672
673#ifdef CONFIG_SERIAL_BFIN_DMA
674 disable_dma(uart->tx_dma_channel);
675 free_dma(uart->tx_dma_channel);
676 disable_dma(uart->rx_dma_channel);
677 free_dma(uart->rx_dma_channel);
678 del_timer(&(uart->rx_dma_timer));
Sonic Zhang75b780b2007-12-21 17:03:39 +0800679 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
Bryan Wu194de562007-05-06 14:50:30 -0700680#else
Sonic Zhang474f1a62007-06-29 16:35:17 +0800681#ifdef CONFIG_KGDB_UART
682 if (uart->port.line != CONFIG_KGDB_UART_PORT)
683#endif
Bryan Wu194de562007-05-06 14:50:30 -0700684 free_irq(uart->port.irq, uart);
685 free_irq(uart->port.irq+1, uart);
686#endif
687}
688
689static void
690bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
691 struct ktermios *old)
692{
693 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
694 unsigned long flags;
695 unsigned int baud, quot;
Mike Frysinger0c44a862008-04-24 04:56:02 +0800696 unsigned short val, ier, lcr = 0;
Bryan Wu194de562007-05-06 14:50:30 -0700697
698 switch (termios->c_cflag & CSIZE) {
699 case CS8:
700 lcr = WLS(8);
701 break;
702 case CS7:
703 lcr = WLS(7);
704 break;
705 case CS6:
706 lcr = WLS(6);
707 break;
708 case CS5:
709 lcr = WLS(5);
710 break;
711 default:
712 printk(KERN_ERR "%s: word lengh not supported\n",
Harvey Harrison71cc2c22008-04-30 00:55:10 -0700713 __func__);
Bryan Wu194de562007-05-06 14:50:30 -0700714 }
715
716 if (termios->c_cflag & CSTOPB)
717 lcr |= STB;
Mike Frysinger19aa6382007-06-11 16:16:45 +0800718 if (termios->c_cflag & PARENB)
Bryan Wu194de562007-05-06 14:50:30 -0700719 lcr |= PEN;
Mike Frysinger19aa6382007-06-11 16:16:45 +0800720 if (!(termios->c_cflag & PARODD))
721 lcr |= EPS;
722 if (termios->c_cflag & CMSPAR)
723 lcr |= STP;
Bryan Wu194de562007-05-06 14:50:30 -0700724
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800725 port->read_status_mask = OE;
726 if (termios->c_iflag & INPCK)
727 port->read_status_mask |= (FE | PE);
728 if (termios->c_iflag & (BRKINT | PARMRK))
729 port->read_status_mask |= BI;
Bryan Wu194de562007-05-06 14:50:30 -0700730
Mike Frysinger2ac5ee42007-05-21 18:09:39 +0800731 /*
732 * Characters to ignore
733 */
734 port->ignore_status_mask = 0;
735 if (termios->c_iflag & IGNPAR)
736 port->ignore_status_mask |= FE | PE;
737 if (termios->c_iflag & IGNBRK) {
738 port->ignore_status_mask |= BI;
739 /*
740 * If we're ignoring parity and break indicators,
741 * ignore overruns too (for real raw support).
742 */
743 if (termios->c_iflag & IGNPAR)
744 port->ignore_status_mask |= OE;
745 }
Bryan Wu194de562007-05-06 14:50:30 -0700746
747 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
748 quot = uart_get_divisor(port, baud);
749 spin_lock_irqsave(&uart->port.lock, flags);
750
Mike Frysinger8851c712007-12-24 19:48:04 +0800751 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
752
Bryan Wu194de562007-05-06 14:50:30 -0700753 /* Disable UART */
754 ier = UART_GET_IER(uart);
Roy Huangf4d640c92007-07-12 16:43:46 +0800755#ifdef CONFIG_BF54x
756 UART_CLEAR_IER(uart, 0xF);
757#else
Bryan Wu194de562007-05-06 14:50:30 -0700758 UART_PUT_IER(uart, 0);
Roy Huangf4d640c92007-07-12 16:43:46 +0800759#endif
Bryan Wu194de562007-05-06 14:50:30 -0700760
761 /* Set DLAB in LCR to Access DLL and DLH */
Mike Frysinger45828b82008-05-07 11:41:26 +0800762 UART_SET_DLAB(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700763
764 UART_PUT_DLL(uart, quot & 0xFF);
Bryan Wu194de562007-05-06 14:50:30 -0700765 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
766 SSYNC();
767
768 /* Clear DLAB in LCR to Access THR RBR IER */
Mike Frysinger45828b82008-05-07 11:41:26 +0800769 UART_CLEAR_DLAB(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700770
771 UART_PUT_LCR(uart, lcr);
772
773 /* Enable UART */
Roy Huangf4d640c92007-07-12 16:43:46 +0800774#ifdef CONFIG_BF54x
775 UART_SET_IER(uart, ier);
776#else
Bryan Wu194de562007-05-06 14:50:30 -0700777 UART_PUT_IER(uart, ier);
Roy Huangf4d640c92007-07-12 16:43:46 +0800778#endif
Bryan Wu194de562007-05-06 14:50:30 -0700779
780 val = UART_GET_GCTL(uart);
781 val |= UCEN;
782 UART_PUT_GCTL(uart, val);
783
784 spin_unlock_irqrestore(&uart->port.lock, flags);
785}
786
787static const char *bfin_serial_type(struct uart_port *port)
788{
789 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
790
791 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
792}
793
794/*
795 * Release the memory region(s) being used by 'port'.
796 */
797static void bfin_serial_release_port(struct uart_port *port)
798{
799}
800
801/*
802 * Request the memory region(s) being used by 'port'.
803 */
804static int bfin_serial_request_port(struct uart_port *port)
805{
806 return 0;
807}
808
809/*
810 * Configure/autoconfigure the port.
811 */
812static void bfin_serial_config_port(struct uart_port *port, int flags)
813{
814 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
815
816 if (flags & UART_CONFIG_TYPE &&
817 bfin_serial_request_port(&uart->port) == 0)
818 uart->port.type = PORT_BFIN;
819}
820
821/*
822 * Verify the new serial_struct (for TIOCSSERIAL).
823 * The only change we allow are to the flags and type, and
824 * even then only between PORT_BFIN and PORT_UNKNOWN
825 */
826static int
827bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
828{
829 return 0;
830}
831
Graf Yang7d01b472008-02-29 11:31:08 +0800832/*
833 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
834 * In other cases, disable IrDA function.
835 */
836static void bfin_set_ldisc(struct tty_struct *tty)
837{
838 int line = tty->index;
839 unsigned short val;
840
841 if (line >= tty->driver->num)
842 return;
843
844 switch (tty->ldisc.num) {
845 case N_IRDA:
846 val = UART_GET_GCTL(&bfin_serial_ports[line]);
847 val |= (IREN | RPOLC);
848 UART_PUT_GCTL(&bfin_serial_ports[line], val);
849 break;
850 default:
851 val = UART_GET_GCTL(&bfin_serial_ports[line]);
852 val &= ~(IREN | RPOLC);
853 UART_PUT_GCTL(&bfin_serial_ports[line], val);
854 }
855}
856
Bryan Wu194de562007-05-06 14:50:30 -0700857static struct uart_ops bfin_serial_pops = {
858 .tx_empty = bfin_serial_tx_empty,
859 .set_mctrl = bfin_serial_set_mctrl,
860 .get_mctrl = bfin_serial_get_mctrl,
861 .stop_tx = bfin_serial_stop_tx,
862 .start_tx = bfin_serial_start_tx,
863 .stop_rx = bfin_serial_stop_rx,
864 .enable_ms = bfin_serial_enable_ms,
865 .break_ctl = bfin_serial_break_ctl,
866 .startup = bfin_serial_startup,
867 .shutdown = bfin_serial_shutdown,
868 .set_termios = bfin_serial_set_termios,
869 .type = bfin_serial_type,
870 .release_port = bfin_serial_release_port,
871 .request_port = bfin_serial_request_port,
872 .config_port = bfin_serial_config_port,
873 .verify_port = bfin_serial_verify_port,
874};
875
876static void __init bfin_serial_init_ports(void)
877{
878 static int first = 1;
879 int i;
880
881 if (!first)
882 return;
883 first = 0;
884
885 for (i = 0; i < nr_ports; i++) {
886 bfin_serial_ports[i].port.uartclk = get_sclk();
887 bfin_serial_ports[i].port.ops = &bfin_serial_pops;
888 bfin_serial_ports[i].port.line = i;
889 bfin_serial_ports[i].port.iotype = UPIO_MEM;
890 bfin_serial_ports[i].port.membase =
891 (void __iomem *)bfin_serial_resource[i].uart_base_addr;
892 bfin_serial_ports[i].port.mapbase =
893 bfin_serial_resource[i].uart_base_addr;
894 bfin_serial_ports[i].port.irq =
895 bfin_serial_resource[i].uart_irq;
896 bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF;
897#ifdef CONFIG_SERIAL_BFIN_DMA
898 bfin_serial_ports[i].tx_done = 1;
899 bfin_serial_ports[i].tx_count = 0;
900 bfin_serial_ports[i].tx_dma_channel =
901 bfin_serial_resource[i].uart_tx_dma_channel;
902 bfin_serial_ports[i].rx_dma_channel =
903 bfin_serial_resource[i].uart_rx_dma_channel;
904 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
Bryan Wu194de562007-05-06 14:50:30 -0700905#endif
906#ifdef CONFIG_SERIAL_BFIN_CTSRTS
Sonic Zhang4cb4f222008-02-02 14:29:25 +0800907 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
Bryan Wu194de562007-05-06 14:50:30 -0700908 bfin_serial_ports[i].cts_pin =
909 bfin_serial_resource[i].uart_cts_pin;
910 bfin_serial_ports[i].rts_pin =
911 bfin_serial_resource[i].uart_rts_pin;
912#endif
913 bfin_serial_hw_init(&bfin_serial_ports[i]);
Bryan Wu194de562007-05-06 14:50:30 -0700914 }
Roy Huangf4d640c92007-07-12 16:43:46 +0800915
Bryan Wu194de562007-05-06 14:50:30 -0700916}
917
918#ifdef CONFIG_SERIAL_BFIN_CONSOLE
Bryan Wu194de562007-05-06 14:50:30 -0700919/*
920 * If the port was already initialised (eg, by a boot loader),
921 * try to determine the current setup.
922 */
923static void __init
924bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
925 int *parity, int *bits)
926{
927 unsigned short status;
928
929 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
930 if (status == (ERBFI | ETBEI)) {
931 /* ok, the port was enabled */
Mike Frysinger45828b82008-05-07 11:41:26 +0800932 u16 lcr, dlh, dll;
Bryan Wu194de562007-05-06 14:50:30 -0700933
934 lcr = UART_GET_LCR(uart);
935
936 *parity = 'n';
937 if (lcr & PEN) {
938 if (lcr & EPS)
939 *parity = 'e';
940 else
941 *parity = 'o';
942 }
943 switch (lcr & 0x03) {
944 case 0: *bits = 5; break;
945 case 1: *bits = 6; break;
946 case 2: *bits = 7; break;
947 case 3: *bits = 8; break;
948 }
949 /* Set DLAB in LCR to Access DLL and DLH */
Mike Frysinger45828b82008-05-07 11:41:26 +0800950 UART_SET_DLAB(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700951
952 dll = UART_GET_DLL(uart);
953 dlh = UART_GET_DLH(uart);
954
955 /* Clear DLAB in LCR to Access THR RBR IER */
Mike Frysinger45828b82008-05-07 11:41:26 +0800956 UART_CLEAR_DLAB(uart);
Bryan Wu194de562007-05-06 14:50:30 -0700957
958 *baud = get_sclk() / (16*(dll | dlh << 8));
959 }
Harvey Harrison71cc2c22008-04-30 00:55:10 -0700960 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
Bryan Wu194de562007-05-06 14:50:30 -0700961}
Robin Getz0ae53642007-10-09 17:24:49 +0800962#endif
963
964#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
965static struct uart_driver bfin_serial_reg;
Bryan Wu194de562007-05-06 14:50:30 -0700966
967static int __init
968bfin_serial_console_setup(struct console *co, char *options)
969{
970 struct bfin_serial_port *uart;
Robin Getz0ae53642007-10-09 17:24:49 +0800971# ifdef CONFIG_SERIAL_BFIN_CONSOLE
Bryan Wu194de562007-05-06 14:50:30 -0700972 int baud = 57600;
973 int bits = 8;
974 int parity = 'n';
Robin Getz0ae53642007-10-09 17:24:49 +0800975# ifdef CONFIG_SERIAL_BFIN_CTSRTS
Bryan Wu194de562007-05-06 14:50:30 -0700976 int flow = 'r';
Robin Getz0ae53642007-10-09 17:24:49 +0800977# else
Bryan Wu194de562007-05-06 14:50:30 -0700978 int flow = 'n';
Robin Getz0ae53642007-10-09 17:24:49 +0800979# endif
980# endif
Bryan Wu194de562007-05-06 14:50:30 -0700981
982 /*
983 * Check whether an invalid uart number has been specified, and
984 * if so, search for the first available port that does have
985 * console support.
986 */
987 if (co->index == -1 || co->index >= nr_ports)
988 co->index = 0;
989 uart = &bfin_serial_ports[co->index];
990
Robin Getz0ae53642007-10-09 17:24:49 +0800991# ifdef CONFIG_SERIAL_BFIN_CONSOLE
Bryan Wu194de562007-05-06 14:50:30 -0700992 if (options)
993 uart_parse_options(options, &baud, &parity, &bits, &flow);
994 else
995 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
996
997 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
Robin Getz0ae53642007-10-09 17:24:49 +0800998# else
999 return 0;
1000# endif
1001}
1002#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1003 defined (CONFIG_EARLY_PRINTK) */
1004
1005#ifdef CONFIG_SERIAL_BFIN_CONSOLE
1006static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1007{
1008 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1009 while (!(UART_GET_LSR(uart) & THRE))
1010 barrier();
1011 UART_PUT_CHAR(uart, ch);
1012 SSYNC();
Bryan Wu194de562007-05-06 14:50:30 -07001013}
1014
Robin Getz0ae53642007-10-09 17:24:49 +08001015/*
1016 * Interrupts are disabled on entering
1017 */
1018static void
1019bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1020{
1021 struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1022 int flags = 0;
1023
1024 spin_lock_irqsave(&uart->port.lock, flags);
1025 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1026 spin_unlock_irqrestore(&uart->port.lock, flags);
1027
1028}
1029
Bryan Wu194de562007-05-06 14:50:30 -07001030static struct console bfin_serial_console = {
1031 .name = BFIN_SERIAL_NAME,
1032 .write = bfin_serial_console_write,
1033 .device = uart_console_device,
1034 .setup = bfin_serial_console_setup,
1035 .flags = CON_PRINTBUFFER,
1036 .index = -1,
1037 .data = &bfin_serial_reg,
1038};
1039
1040static int __init bfin_serial_rs_console_init(void)
1041{
1042 bfin_serial_init_ports();
1043 register_console(&bfin_serial_console);
Sonic Zhang474f1a62007-06-29 16:35:17 +08001044#ifdef CONFIG_KGDB_UART
1045 kgdb_entry_state = 0;
1046 init_kgdb_uart();
1047#endif
Bryan Wu194de562007-05-06 14:50:30 -07001048 return 0;
1049}
1050console_initcall(bfin_serial_rs_console_init);
1051
1052#define BFIN_SERIAL_CONSOLE &bfin_serial_console
1053#else
1054#define BFIN_SERIAL_CONSOLE NULL
Robin Getz0ae53642007-10-09 17:24:49 +08001055#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1056
1057
1058#ifdef CONFIG_EARLY_PRINTK
1059static __init void early_serial_putc(struct uart_port *port, int ch)
1060{
1061 unsigned timeout = 0xffff;
1062 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1063
1064 while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1065 cpu_relax();
1066 UART_PUT_CHAR(uart, ch);
1067}
1068
1069static __init void early_serial_write(struct console *con, const char *s,
1070 unsigned int n)
1071{
1072 struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1073 unsigned int i;
1074
1075 for (i = 0; i < n; i++, s++) {
1076 if (*s == '\n')
1077 early_serial_putc(&uart->port, '\r');
1078 early_serial_putc(&uart->port, *s);
1079 }
1080}
1081
1082static struct __init console bfin_early_serial_console = {
1083 .name = "early_BFuart",
1084 .write = early_serial_write,
1085 .device = uart_console_device,
1086 .flags = CON_PRINTBUFFER,
1087 .setup = bfin_serial_console_setup,
1088 .index = -1,
1089 .data = &bfin_serial_reg,
1090};
1091
1092struct console __init *bfin_earlyserial_init(unsigned int port,
1093 unsigned int cflag)
1094{
1095 struct bfin_serial_port *uart;
1096 struct ktermios t;
1097
1098 if (port == -1 || port >= nr_ports)
1099 port = 0;
1100 bfin_serial_init_ports();
1101 bfin_early_serial_console.index = port;
Robin Getz0ae53642007-10-09 17:24:49 +08001102 uart = &bfin_serial_ports[port];
1103 t.c_cflag = cflag;
1104 t.c_iflag = 0;
1105 t.c_oflag = 0;
1106 t.c_lflag = ICANON;
1107 t.c_line = port;
1108 bfin_serial_set_termios(&uart->port, &t, &t);
1109 return &bfin_early_serial_console;
1110}
1111
1112#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
Bryan Wu194de562007-05-06 14:50:30 -07001113
1114static struct uart_driver bfin_serial_reg = {
1115 .owner = THIS_MODULE,
1116 .driver_name = "bfin-uart",
1117 .dev_name = BFIN_SERIAL_NAME,
1118 .major = BFIN_SERIAL_MAJOR,
1119 .minor = BFIN_SERIAL_MINOR,
Graf Yang2ade9722008-04-25 02:55:49 +08001120 .nr = BFIN_UART_NR_PORTS,
Bryan Wu194de562007-05-06 14:50:30 -07001121 .cons = BFIN_SERIAL_CONSOLE,
1122};
1123
1124static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1125{
1126 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1127
1128 if (uart)
1129 uart_suspend_port(&bfin_serial_reg, &uart->port);
1130
1131 return 0;
1132}
1133
1134static int bfin_serial_resume(struct platform_device *dev)
1135{
1136 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1137
1138 if (uart)
1139 uart_resume_port(&bfin_serial_reg, &uart->port);
1140
1141 return 0;
1142}
1143
1144static int bfin_serial_probe(struct platform_device *dev)
1145{
1146 struct resource *res = dev->resource;
1147 int i;
1148
1149 for (i = 0; i < dev->num_resources; i++, res++)
1150 if (res->flags & IORESOURCE_MEM)
1151 break;
1152
1153 if (i < dev->num_resources) {
1154 for (i = 0; i < nr_ports; i++, res++) {
1155 if (bfin_serial_ports[i].port.mapbase != res->start)
1156 continue;
1157 bfin_serial_ports[i].port.dev = &dev->dev;
1158 uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1159 platform_set_drvdata(dev, &bfin_serial_ports[i]);
1160 }
1161 }
1162
1163 return 0;
1164}
1165
1166static int bfin_serial_remove(struct platform_device *pdev)
1167{
1168 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1169
1170
1171#ifdef CONFIG_SERIAL_BFIN_CTSRTS
1172 gpio_free(uart->cts_pin);
1173 gpio_free(uart->rts_pin);
1174#endif
1175
1176 platform_set_drvdata(pdev, NULL);
1177
1178 if (uart)
1179 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1180
1181 return 0;
1182}
1183
1184static struct platform_driver bfin_serial_driver = {
1185 .probe = bfin_serial_probe,
1186 .remove = bfin_serial_remove,
1187 .suspend = bfin_serial_suspend,
1188 .resume = bfin_serial_resume,
1189 .driver = {
1190 .name = "bfin-uart",
Kay Sieverse169c132008-04-15 14:34:35 -07001191 .owner = THIS_MODULE,
Bryan Wu194de562007-05-06 14:50:30 -07001192 },
1193};
1194
1195static int __init bfin_serial_init(void)
1196{
1197 int ret;
Sonic Zhang474f1a62007-06-29 16:35:17 +08001198#ifdef CONFIG_KGDB_UART
1199 struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
Sonic Zhanga359cca2007-10-10 16:47:58 +08001200 struct ktermios t;
Sonic Zhang474f1a62007-06-29 16:35:17 +08001201#endif
Bryan Wu194de562007-05-06 14:50:30 -07001202
1203 pr_info("Serial: Blackfin serial driver\n");
1204
1205 bfin_serial_init_ports();
1206
1207 ret = uart_register_driver(&bfin_serial_reg);
1208 if (ret == 0) {
Graf Yang7d01b472008-02-29 11:31:08 +08001209 bfin_serial_reg.tty_driver->set_ldisc = bfin_set_ldisc;
Bryan Wu194de562007-05-06 14:50:30 -07001210 ret = platform_driver_register(&bfin_serial_driver);
1211 if (ret) {
1212 pr_debug("uart register failed\n");
1213 uart_unregister_driver(&bfin_serial_reg);
1214 }
1215 }
Sonic Zhang474f1a62007-06-29 16:35:17 +08001216#ifdef CONFIG_KGDB_UART
1217 if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
Sonic Zhanga359cca2007-10-10 16:47:58 +08001218 request_irq(uart->port.irq, bfin_serial_rx_int,
Sonic Zhang474f1a62007-06-29 16:35:17 +08001219 IRQF_DISABLED, "BFIN_UART_RX", uart);
1220 pr_info("Request irq for kgdb uart port\n");
Sonic Zhanga359cca2007-10-10 16:47:58 +08001221 UART_SET_IER(uart, ERBFI);
Mike Frysingerd5148ff2007-07-25 11:57:42 +08001222 SSYNC();
Sonic Zhang474f1a62007-06-29 16:35:17 +08001223 t.c_cflag = CS8|B57600;
1224 t.c_iflag = 0;
1225 t.c_oflag = 0;
1226 t.c_lflag = ICANON;
1227 t.c_line = CONFIG_KGDB_UART_PORT;
1228 bfin_serial_set_termios(&uart->port, &t, &t);
1229 }
1230#endif
Bryan Wu194de562007-05-06 14:50:30 -07001231 return ret;
1232}
1233
1234static void __exit bfin_serial_exit(void)
1235{
1236 platform_driver_unregister(&bfin_serial_driver);
1237 uart_unregister_driver(&bfin_serial_reg);
1238}
1239
1240module_init(bfin_serial_init);
1241module_exit(bfin_serial_exit);
1242
1243MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1244MODULE_DESCRIPTION("Blackfin generic serial port driver");
1245MODULE_LICENSE("GPL");
1246MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
Kay Sieverse169c132008-04-15 14:34:35 -07001247MODULE_ALIAS("platform:bfin-uart");