Commit | Line | Data |
---|---|---|
194de561 | 1 | /* |
1ba7a3ee | 2 | * Blackfin On-Chip Serial Driver |
194de561 | 3 | * |
1ba7a3ee | 4 | * Copyright 2006-2007 Analog Devices Inc. |
194de561 | 5 | * |
1ba7a3ee | 6 | * Enter bugs at http://blackfin.uclinux.org/ |
194de561 | 7 | * |
1ba7a3ee | 8 | * Licensed under the GPL-2 or later. |
194de561 BW |
9 | */ |
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 | ||
474f1a66 SZ |
25 | #ifdef CONFIG_KGDB_UART |
26 | #include <linux/kgdb.h> | |
27 | #include <asm/irq_regs.h> | |
28 | #endif | |
29 | ||
194de561 BW |
30 | #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 | ||
0aef4564 | 51 | #define DMA_RX_FLUSH_JIFFIES (HZ / 50) |
f30ac0ce | 52 | #define CTS_CHECK_JIFFIES (HZ / 50) |
194de561 BW |
53 | |
54 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
55 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); | |
56 | #else | |
194de561 | 57 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart); |
194de561 BW |
58 | #endif |
59 | ||
60 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart); | |
61 | ||
62 | /* | |
63 | * interrupts are disabled on entry | |
64 | */ | |
65 | static void bfin_serial_stop_tx(struct uart_port *port) | |
66 | { | |
67 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
0711d857 | 68 | struct circ_buf *xmit = &uart->port.info->xmit; |
194de561 | 69 | |
f4d640c9 | 70 | while (!(UART_GET_LSR(uart) & TEMT)) |
0711d857 | 71 | cpu_relax(); |
f4d640c9 | 72 | |
194de561 BW |
73 | #ifdef CONFIG_SERIAL_BFIN_DMA |
74 | disable_dma(uart->tx_dma_channel); | |
0711d857 SZ |
75 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
76 | uart->port.icount.tx += uart->tx_count; | |
77 | uart->tx_count = 0; | |
78 | uart->tx_done = 1; | |
f4d640c9 RH |
79 | #else |
80 | #ifdef CONFIG_BF54x | |
f4d640c9 RH |
81 | /* Clear TFI bit */ |
82 | UART_PUT_LSR(uart, TFI); | |
194de561 | 83 | #endif |
89bf6dc5 | 84 | UART_CLEAR_IER(uart, ETBEI); |
f4d640c9 | 85 | #endif |
194de561 BW |
86 | } |
87 | ||
88 | /* | |
89 | * port is locked and interrupts are disabled | |
90 | */ | |
91 | static void bfin_serial_start_tx(struct uart_port *port) | |
92 | { | |
93 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
94 | ||
95 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
0711d857 SZ |
96 | if (uart->tx_done) |
97 | bfin_serial_dma_tx_chars(uart); | |
f4d640c9 | 98 | #else |
f4d640c9 | 99 | UART_SET_IER(uart, ETBEI); |
a359cca7 | 100 | bfin_serial_tx_chars(uart); |
f4d640c9 | 101 | #endif |
194de561 BW |
102 | } |
103 | ||
104 | /* | |
105 | * Interrupts are enabled | |
106 | */ | |
107 | static void bfin_serial_stop_rx(struct uart_port *port) | |
108 | { | |
109 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
89bf6dc5 MF |
110 | #ifdef CONFIG_KGDB_UART |
111 | if (uart->port.line != CONFIG_KGDB_UART_PORT) | |
a359cca7 | 112 | #endif |
f4d640c9 | 113 | UART_CLEAR_IER(uart, ERBFI); |
194de561 BW |
114 | } |
115 | ||
116 | /* | |
117 | * Set the modem control timer to fire immediately. | |
118 | */ | |
119 | static void bfin_serial_enable_ms(struct uart_port *port) | |
120 | { | |
121 | } | |
122 | ||
474f1a66 SZ |
123 | #ifdef CONFIG_KGDB_UART |
124 | static int kgdb_entry_state; | |
125 | ||
126 | void kgdb_put_debug_char(int chr) | |
127 | { | |
128 | struct bfin_serial_port *uart; | |
129 | ||
2ade9729 GY |
130 | if (CONFIG_KGDB_UART_PORT < 0 |
131 | || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS) | |
474f1a66 SZ |
132 | uart = &bfin_serial_ports[0]; |
133 | else | |
134 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; | |
135 | ||
136 | while (!(UART_GET_LSR(uart) & THRE)) { | |
d5148ffa | 137 | SSYNC(); |
474f1a66 | 138 | } |
a359cca7 | 139 | |
45828b81 | 140 | UART_CLEAR_DLAB(uart); |
474f1a66 | 141 | UART_PUT_CHAR(uart, (unsigned char)chr); |
d5148ffa | 142 | SSYNC(); |
474f1a66 SZ |
143 | } |
144 | ||
145 | int kgdb_get_debug_char(void) | |
146 | { | |
147 | struct bfin_serial_port *uart; | |
148 | unsigned char chr; | |
149 | ||
2ade9729 GY |
150 | if (CONFIG_KGDB_UART_PORT < 0 |
151 | || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS) | |
474f1a66 SZ |
152 | uart = &bfin_serial_ports[0]; |
153 | else | |
154 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; | |
155 | ||
156 | while(!(UART_GET_LSR(uart) & DR)) { | |
d5148ffa | 157 | SSYNC(); |
474f1a66 | 158 | } |
45828b81 | 159 | UART_CLEAR_DLAB(uart); |
474f1a66 | 160 | chr = UART_GET_CHAR(uart); |
d5148ffa | 161 | SSYNC(); |
474f1a66 SZ |
162 | |
163 | return chr; | |
164 | } | |
165 | #endif | |
166 | ||
50e2e15a | 167 | #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO) |
8851c71e MF |
168 | # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold) |
169 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v)) | |
170 | #else | |
171 | # define UART_GET_ANOMALY_THRESHOLD(uart) 0 | |
172 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) | |
173 | #endif | |
174 | ||
194de561 | 175 | #ifdef CONFIG_SERIAL_BFIN_PIO |
194de561 BW |
176 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) |
177 | { | |
2ac5ee47 | 178 | struct tty_struct *tty = uart->port.info->tty; |
194de561 | 179 | unsigned int status, ch, flg; |
8851c71e | 180 | static struct timeval anomaly_start = { .tv_sec = 0 }; |
194de561 | 181 | |
759eb040 | 182 | status = UART_GET_LSR(uart); |
0bcfd70e MF |
183 | UART_CLEAR_LSR(uart); |
184 | ||
185 | ch = UART_GET_CHAR(uart); | |
194de561 BW |
186 | uart->port.icount.rx++; |
187 | ||
474f1a66 SZ |
188 | #ifdef CONFIG_KGDB_UART |
189 | if (uart->port.line == CONFIG_KGDB_UART_PORT) { | |
89bf6dc5 | 190 | struct pt_regs *regs = get_irq_regs(); |
474f1a66 SZ |
191 | if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */ |
192 | kgdb_breakkey_pressed(regs); | |
193 | return; | |
194 | } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */ | |
195 | kgdb_entry_state = 1; | |
196 | } else if (kgdb_entry_state == 1 && ch == 'q') { | |
197 | kgdb_entry_state = 0; | |
198 | kgdb_breakkey_pressed(regs); | |
199 | return; | |
200 | } else if (ch == 0x3) {/* Ctrl + C */ | |
201 | kgdb_entry_state = 0; | |
202 | kgdb_breakkey_pressed(regs); | |
203 | return; | |
204 | } else { | |
205 | kgdb_entry_state = 0; | |
206 | } | |
207 | } | |
208 | #endif | |
bbf275f0 | 209 | |
50e2e15a | 210 | if (ANOMALY_05000363) { |
8851c71e MF |
211 | /* The BF533 (and BF561) family of processors have a nice anomaly |
212 | * where they continuously generate characters for a "single" break. | |
bbf275f0 | 213 | * We have to basically ignore this flood until the "next" valid |
8851c71e MF |
214 | * character comes across. Due to the nature of the flood, it is |
215 | * not possible to reliably catch bytes that are sent too quickly | |
216 | * after this break. So application code talking to the Blackfin | |
217 | * which sends a break signal must allow at least 1.5 character | |
218 | * times after the end of the break for things to stabilize. This | |
219 | * timeout was picked as it must absolutely be larger than 1 | |
220 | * character time +/- some percent. So 1.5 sounds good. All other | |
221 | * Blackfin families operate properly. Woo. | |
bbf275f0 | 222 | */ |
8851c71e MF |
223 | if (anomaly_start.tv_sec) { |
224 | struct timeval curr; | |
225 | suseconds_t usecs; | |
226 | ||
227 | if ((~ch & (~ch + 1)) & 0xff) | |
228 | goto known_good_char; | |
229 | ||
230 | do_gettimeofday(&curr); | |
231 | if (curr.tv_sec - anomaly_start.tv_sec > 1) | |
232 | goto known_good_char; | |
233 | ||
234 | usecs = 0; | |
235 | if (curr.tv_sec != anomaly_start.tv_sec) | |
236 | usecs += USEC_PER_SEC; | |
237 | usecs += curr.tv_usec - anomaly_start.tv_usec; | |
238 | ||
239 | if (usecs > UART_GET_ANOMALY_THRESHOLD(uart)) | |
240 | goto known_good_char; | |
241 | ||
242 | if (ch) | |
243 | anomaly_start.tv_sec = 0; | |
244 | else | |
245 | anomaly_start = curr; | |
246 | ||
247 | return; | |
248 | ||
249 | known_good_char: | |
250 | anomaly_start.tv_sec = 0; | |
bbf275f0 | 251 | } |
194de561 | 252 | } |
194de561 BW |
253 | |
254 | if (status & BI) { | |
50e2e15a | 255 | if (ANOMALY_05000363) |
8851c71e MF |
256 | if (bfin_revid() < 5) |
257 | do_gettimeofday(&anomaly_start); | |
194de561 BW |
258 | uart->port.icount.brk++; |
259 | if (uart_handle_break(&uart->port)) | |
260 | goto ignore_char; | |
9808901b | 261 | status &= ~(PE | FE); |
2ac5ee47 MF |
262 | } |
263 | if (status & PE) | |
194de561 | 264 | uart->port.icount.parity++; |
2ac5ee47 | 265 | if (status & OE) |
194de561 | 266 | uart->port.icount.overrun++; |
2ac5ee47 | 267 | if (status & FE) |
194de561 | 268 | uart->port.icount.frame++; |
2ac5ee47 MF |
269 | |
270 | status &= uart->port.read_status_mask; | |
271 | ||
272 | if (status & BI) | |
273 | flg = TTY_BREAK; | |
274 | else if (status & PE) | |
275 | flg = TTY_PARITY; | |
276 | else if (status & FE) | |
277 | flg = TTY_FRAME; | |
278 | else | |
194de561 BW |
279 | flg = TTY_NORMAL; |
280 | ||
281 | if (uart_handle_sysrq_char(&uart->port, ch)) | |
282 | goto ignore_char; | |
194de561 | 283 | |
2ac5ee47 MF |
284 | uart_insert_char(&uart->port, status, OE, ch, flg); |
285 | ||
286 | ignore_char: | |
287 | tty_flip_buffer_push(tty); | |
194de561 BW |
288 | } |
289 | ||
290 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) | |
291 | { | |
292 | struct circ_buf *xmit = &uart->port.info->xmit; | |
293 | ||
194de561 BW |
294 | /* |
295 | * Check the modem control lines before | |
296 | * transmitting anything. | |
297 | */ | |
298 | bfin_serial_mctrl_check(uart); | |
299 | ||
300 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { | |
301 | bfin_serial_stop_tx(&uart->port); | |
302 | return; | |
303 | } | |
304 | ||
f30ac0ce SZ |
305 | if (uart->port.x_char) { |
306 | UART_PUT_CHAR(uart, uart->port.x_char); | |
307 | uart->port.icount.tx++; | |
308 | uart->port.x_char = 0; | |
309 | } | |
310 | ||
759eb040 SZ |
311 | while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) { |
312 | UART_PUT_CHAR(uart, xmit->buf[xmit->tail]); | |
313 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
314 | uart->port.icount.tx++; | |
315 | SSYNC(); | |
316 | } | |
194de561 BW |
317 | |
318 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
319 | uart_write_wakeup(&uart->port); | |
320 | ||
321 | if (uart_circ_empty(xmit)) | |
322 | bfin_serial_stop_tx(&uart->port); | |
323 | } | |
324 | ||
5c4e472b AL |
325 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) |
326 | { | |
327 | struct bfin_serial_port *uart = dev_id; | |
328 | ||
f4d640c9 | 329 | spin_lock(&uart->port.lock); |
0bcfd70e | 330 | while (UART_GET_LSR(uart) & DR) |
f4d640c9 | 331 | bfin_serial_rx_chars(uart); |
f4d640c9 | 332 | spin_unlock(&uart->port.lock); |
759eb040 | 333 | |
5c4e472b AL |
334 | return IRQ_HANDLED; |
335 | } | |
336 | ||
337 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) | |
194de561 BW |
338 | { |
339 | struct bfin_serial_port *uart = dev_id; | |
194de561 | 340 | |
f4d640c9 | 341 | spin_lock(&uart->port.lock); |
0bcfd70e | 342 | if (UART_GET_LSR(uart) & THRE) |
f4d640c9 | 343 | bfin_serial_tx_chars(uart); |
f4d640c9 | 344 | spin_unlock(&uart->port.lock); |
759eb040 | 345 | |
194de561 BW |
346 | return IRQ_HANDLED; |
347 | } | |
4cb4f22b | 348 | #endif |
194de561 | 349 | |
194de561 BW |
350 | #ifdef CONFIG_SERIAL_BFIN_DMA |
351 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) | |
352 | { | |
353 | struct circ_buf *xmit = &uart->port.info->xmit; | |
194de561 | 354 | |
194de561 BW |
355 | uart->tx_done = 0; |
356 | ||
f30ac0ce SZ |
357 | /* |
358 | * Check the modem control lines before | |
359 | * transmitting anything. | |
360 | */ | |
361 | bfin_serial_mctrl_check(uart); | |
362 | ||
1b73351c | 363 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
0711d857 | 364 | uart->tx_count = 0; |
1b73351c SZ |
365 | uart->tx_done = 1; |
366 | return; | |
367 | } | |
368 | ||
194de561 BW |
369 | if (uart->port.x_char) { |
370 | UART_PUT_CHAR(uart, uart->port.x_char); | |
371 | uart->port.icount.tx++; | |
372 | uart->port.x_char = 0; | |
194de561 | 373 | } |
1b73351c | 374 | |
194de561 BW |
375 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); |
376 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) | |
377 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; | |
378 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), | |
379 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); | |
380 | set_dma_config(uart->tx_dma_channel, | |
381 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, | |
382 | INTR_ON_BUF, | |
383 | DIMENSION_LINEAR, | |
2047e40d MH |
384 | DATA_SIZE_8, |
385 | DMA_SYNC_RESTART)); | |
194de561 BW |
386 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); |
387 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); | |
388 | set_dma_x_modify(uart->tx_dma_channel, 1); | |
389 | enable_dma(uart->tx_dma_channel); | |
99ee7b5f | 390 | |
f4d640c9 | 391 | UART_SET_IER(uart, ETBEI); |
194de561 BW |
392 | } |
393 | ||
2ac5ee47 | 394 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) |
194de561 BW |
395 | { |
396 | struct tty_struct *tty = uart->port.info->tty; | |
397 | int i, flg, status; | |
398 | ||
399 | status = UART_GET_LSR(uart); | |
0bcfd70e MF |
400 | UART_CLEAR_LSR(uart); |
401 | ||
56f5de8f SZ |
402 | uart->port.icount.rx += |
403 | CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, | |
404 | UART_XMIT_SIZE); | |
194de561 BW |
405 | |
406 | if (status & BI) { | |
407 | uart->port.icount.brk++; | |
408 | if (uart_handle_break(&uart->port)) | |
409 | goto dma_ignore_char; | |
9808901b | 410 | status &= ~(PE | FE); |
2ac5ee47 MF |
411 | } |
412 | if (status & PE) | |
194de561 | 413 | uart->port.icount.parity++; |
2ac5ee47 | 414 | if (status & OE) |
194de561 | 415 | uart->port.icount.overrun++; |
2ac5ee47 | 416 | if (status & FE) |
194de561 | 417 | uart->port.icount.frame++; |
2ac5ee47 MF |
418 | |
419 | status &= uart->port.read_status_mask; | |
420 | ||
421 | if (status & BI) | |
422 | flg = TTY_BREAK; | |
423 | else if (status & PE) | |
424 | flg = TTY_PARITY; | |
425 | else if (status & FE) | |
426 | flg = TTY_FRAME; | |
427 | else | |
194de561 BW |
428 | flg = TTY_NORMAL; |
429 | ||
56f5de8f SZ |
430 | for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) { |
431 | if (i >= UART_XMIT_SIZE) | |
432 | i = 0; | |
433 | if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) | |
434 | uart_insert_char(&uart->port, status, OE, | |
435 | uart->rx_dma_buf.buf[i], flg); | |
194de561 | 436 | } |
2ac5ee47 MF |
437 | |
438 | dma_ignore_char: | |
194de561 BW |
439 | tty_flip_buffer_push(tty); |
440 | } | |
441 | ||
442 | void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) | |
443 | { | |
444 | int x_pos, pos; | |
194de561 | 445 | |
56f5de8f SZ |
446 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); |
447 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); | |
448 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; | |
449 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT) | |
450 | uart->rx_dma_nrows = 0; | |
451 | x_pos = DMA_RX_XCOUNT - x_pos; | |
194de561 BW |
452 | if (x_pos == DMA_RX_XCOUNT) |
453 | x_pos = 0; | |
454 | ||
455 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; | |
56f5de8f SZ |
456 | if (pos != uart->rx_dma_buf.tail) { |
457 | uart->rx_dma_buf.head = pos; | |
194de561 | 458 | bfin_serial_dma_rx_chars(uart); |
56f5de8f | 459 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; |
194de561 | 460 | } |
0aef4564 | 461 | |
0a278423 | 462 | mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES); |
194de561 BW |
463 | } |
464 | ||
465 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) | |
466 | { | |
467 | struct bfin_serial_port *uart = dev_id; | |
468 | struct circ_buf *xmit = &uart->port.info->xmit; | |
194de561 BW |
469 | |
470 | spin_lock(&uart->port.lock); | |
471 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { | |
194de561 | 472 | disable_dma(uart->tx_dma_channel); |
0711d857 | 473 | clear_dma_irqstat(uart->tx_dma_channel); |
f4d640c9 | 474 | UART_CLEAR_IER(uart, ETBEI); |
0711d857 SZ |
475 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
476 | uart->port.icount.tx += uart->tx_count; | |
1b73351c | 477 | |
56f5de8f SZ |
478 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
479 | uart_write_wakeup(&uart->port); | |
480 | ||
1b73351c | 481 | bfin_serial_dma_tx_chars(uart); |
194de561 BW |
482 | } |
483 | ||
484 | spin_unlock(&uart->port.lock); | |
485 | return IRQ_HANDLED; | |
486 | } | |
487 | ||
488 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) | |
489 | { | |
490 | struct bfin_serial_port *uart = dev_id; | |
491 | unsigned short irqstat; | |
0711d857 | 492 | |
194de561 BW |
493 | spin_lock(&uart->port.lock); |
494 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); | |
495 | clear_dma_irqstat(uart->rx_dma_channel); | |
194de561 | 496 | spin_unlock(&uart->port.lock); |
0aef4564 | 497 | |
0a278423 | 498 | mod_timer(&(uart->rx_dma_timer), jiffies); |
0aef4564 | 499 | |
194de561 BW |
500 | return IRQ_HANDLED; |
501 | } | |
502 | #endif | |
503 | ||
504 | /* | |
505 | * Return TIOCSER_TEMT when transmitter is not busy. | |
506 | */ | |
507 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) | |
508 | { | |
509 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
510 | unsigned short lsr; | |
511 | ||
512 | lsr = UART_GET_LSR(uart); | |
513 | if (lsr & TEMT) | |
514 | return TIOCSER_TEMT; | |
515 | else | |
516 | return 0; | |
517 | } | |
518 | ||
519 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) | |
520 | { | |
521 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
522 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
523 | if (uart->cts_pin < 0) | |
524 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
525 | ||
1feaa51d | 526 | if (UART_GET_CTS(uart)) |
194de561 BW |
527 | return TIOCM_DSR | TIOCM_CAR; |
528 | else | |
529 | #endif | |
530 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
531 | } | |
532 | ||
533 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
534 | { | |
535 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
536 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
537 | if (uart->rts_pin < 0) | |
538 | return; | |
539 | ||
540 | if (mctrl & TIOCM_RTS) | |
1feaa51d | 541 | UART_CLEAR_RTS(uart); |
194de561 | 542 | else |
1feaa51d | 543 | UART_SET_RTS(uart); |
194de561 BW |
544 | #endif |
545 | } | |
546 | ||
547 | /* | |
548 | * Handle any change of modem status signal since we were last called. | |
549 | */ | |
550 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart) | |
551 | { | |
552 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
553 | unsigned int status; | |
194de561 BW |
554 | struct uart_info *info = uart->port.info; |
555 | struct tty_struct *tty = info->tty; | |
556 | ||
557 | status = bfin_serial_get_mctrl(&uart->port); | |
4cb4f22b | 558 | uart_handle_cts_change(&uart->port, status & TIOCM_CTS); |
194de561 BW |
559 | if (!(status & TIOCM_CTS)) { |
560 | tty->hw_stopped = 1; | |
f30ac0ce SZ |
561 | uart->cts_timer.data = (unsigned long)(uart); |
562 | uart->cts_timer.function = (void *)bfin_serial_mctrl_check; | |
563 | uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES; | |
564 | add_timer(&(uart->cts_timer)); | |
194de561 BW |
565 | } else { |
566 | tty->hw_stopped = 0; | |
567 | } | |
194de561 BW |
568 | #endif |
569 | } | |
570 | ||
571 | /* | |
572 | * Interrupts are always disabled. | |
573 | */ | |
574 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) | |
575 | { | |
cf686762 MF |
576 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
577 | u16 lcr = UART_GET_LCR(uart); | |
578 | if (break_state) | |
579 | lcr |= SB; | |
580 | else | |
581 | lcr &= ~SB; | |
582 | UART_PUT_LCR(uart, lcr); | |
583 | SSYNC(); | |
194de561 BW |
584 | } |
585 | ||
586 | static int bfin_serial_startup(struct uart_port *port) | |
587 | { | |
588 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
589 | ||
590 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
591 | dma_addr_t dma_handle; | |
592 | ||
593 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { | |
594 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); | |
595 | return -EBUSY; | |
596 | } | |
597 | ||
598 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { | |
599 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); | |
600 | free_dma(uart->rx_dma_channel); | |
601 | return -EBUSY; | |
602 | } | |
603 | ||
604 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); | |
605 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); | |
606 | ||
607 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); | |
608 | uart->rx_dma_buf.head = 0; | |
609 | uart->rx_dma_buf.tail = 0; | |
610 | uart->rx_dma_nrows = 0; | |
611 | ||
612 | set_dma_config(uart->rx_dma_channel, | |
613 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, | |
614 | INTR_ON_ROW, DIMENSION_2D, | |
2047e40d MH |
615 | DATA_SIZE_8, |
616 | DMA_SYNC_RESTART)); | |
194de561 BW |
617 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); |
618 | set_dma_x_modify(uart->rx_dma_channel, 1); | |
619 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); | |
620 | set_dma_y_modify(uart->rx_dma_channel, 1); | |
621 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); | |
622 | enable_dma(uart->rx_dma_channel); | |
623 | ||
624 | uart->rx_dma_timer.data = (unsigned long)(uart); | |
625 | uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; | |
626 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; | |
627 | add_timer(&(uart->rx_dma_timer)); | |
628 | #else | |
a359cca7 SZ |
629 | if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED, |
630 | "BFIN_UART_RX", uart)) { | |
474f1a66 | 631 | # ifdef CONFIG_KGDB_UART |
a359cca7 | 632 | if (uart->port.line != CONFIG_KGDB_UART_PORT) { |
474f1a66 | 633 | # endif |
194de561 BW |
634 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); |
635 | return -EBUSY; | |
a359cca7 SZ |
636 | # ifdef CONFIG_KGDB_UART |
637 | } | |
638 | # endif | |
194de561 BW |
639 | } |
640 | ||
641 | if (request_irq | |
5c4e472b | 642 | (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED, |
194de561 BW |
643 | "BFIN_UART_TX", uart)) { |
644 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); | |
645 | free_irq(uart->port.irq, uart); | |
646 | return -EBUSY; | |
647 | } | |
648 | #endif | |
f4d640c9 | 649 | UART_SET_IER(uart, ERBFI); |
194de561 BW |
650 | return 0; |
651 | } | |
652 | ||
653 | static void bfin_serial_shutdown(struct uart_port *port) | |
654 | { | |
655 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
656 | ||
657 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
658 | disable_dma(uart->tx_dma_channel); | |
659 | free_dma(uart->tx_dma_channel); | |
660 | disable_dma(uart->rx_dma_channel); | |
661 | free_dma(uart->rx_dma_channel); | |
662 | del_timer(&(uart->rx_dma_timer)); | |
75b780bd | 663 | dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0); |
194de561 | 664 | #else |
474f1a66 SZ |
665 | #ifdef CONFIG_KGDB_UART |
666 | if (uart->port.line != CONFIG_KGDB_UART_PORT) | |
667 | #endif | |
194de561 BW |
668 | free_irq(uart->port.irq, uart); |
669 | free_irq(uart->port.irq+1, uart); | |
670 | #endif | |
671 | } | |
672 | ||
673 | static void | |
674 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, | |
675 | struct ktermios *old) | |
676 | { | |
677 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
678 | unsigned long flags; | |
679 | unsigned int baud, quot; | |
0c44a86d | 680 | unsigned short val, ier, lcr = 0; |
194de561 BW |
681 | |
682 | switch (termios->c_cflag & CSIZE) { | |
683 | case CS8: | |
684 | lcr = WLS(8); | |
685 | break; | |
686 | case CS7: | |
687 | lcr = WLS(7); | |
688 | break; | |
689 | case CS6: | |
690 | lcr = WLS(6); | |
691 | break; | |
692 | case CS5: | |
693 | lcr = WLS(5); | |
694 | break; | |
695 | default: | |
696 | printk(KERN_ERR "%s: word lengh not supported\n", | |
71cc2c21 | 697 | __func__); |
194de561 BW |
698 | } |
699 | ||
700 | if (termios->c_cflag & CSTOPB) | |
701 | lcr |= STB; | |
19aa6382 | 702 | if (termios->c_cflag & PARENB) |
194de561 | 703 | lcr |= PEN; |
19aa6382 MF |
704 | if (!(termios->c_cflag & PARODD)) |
705 | lcr |= EPS; | |
706 | if (termios->c_cflag & CMSPAR) | |
707 | lcr |= STP; | |
194de561 | 708 | |
2ac5ee47 MF |
709 | port->read_status_mask = OE; |
710 | if (termios->c_iflag & INPCK) | |
711 | port->read_status_mask |= (FE | PE); | |
712 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
713 | port->read_status_mask |= BI; | |
194de561 | 714 | |
2ac5ee47 MF |
715 | /* |
716 | * Characters to ignore | |
717 | */ | |
718 | port->ignore_status_mask = 0; | |
719 | if (termios->c_iflag & IGNPAR) | |
720 | port->ignore_status_mask |= FE | PE; | |
721 | if (termios->c_iflag & IGNBRK) { | |
722 | port->ignore_status_mask |= BI; | |
723 | /* | |
724 | * If we're ignoring parity and break indicators, | |
725 | * ignore overruns too (for real raw support). | |
726 | */ | |
727 | if (termios->c_iflag & IGNPAR) | |
728 | port->ignore_status_mask |= OE; | |
729 | } | |
194de561 BW |
730 | |
731 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
732 | quot = uart_get_divisor(port, baud); | |
733 | spin_lock_irqsave(&uart->port.lock, flags); | |
734 | ||
8851c71e MF |
735 | UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15); |
736 | ||
194de561 BW |
737 | /* Disable UART */ |
738 | ier = UART_GET_IER(uart); | |
1feaa51d | 739 | UART_DISABLE_INTS(uart); |
194de561 BW |
740 | |
741 | /* Set DLAB in LCR to Access DLL and DLH */ | |
45828b81 | 742 | UART_SET_DLAB(uart); |
194de561 BW |
743 | |
744 | UART_PUT_DLL(uart, quot & 0xFF); | |
194de561 BW |
745 | UART_PUT_DLH(uart, (quot >> 8) & 0xFF); |
746 | SSYNC(); | |
747 | ||
748 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
45828b81 | 749 | UART_CLEAR_DLAB(uart); |
194de561 BW |
750 | |
751 | UART_PUT_LCR(uart, lcr); | |
752 | ||
753 | /* Enable UART */ | |
1feaa51d | 754 | UART_ENABLE_INTS(uart, ier); |
194de561 BW |
755 | |
756 | val = UART_GET_GCTL(uart); | |
757 | val |= UCEN; | |
758 | UART_PUT_GCTL(uart, val); | |
759 | ||
760 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
761 | } | |
762 | ||
763 | static const char *bfin_serial_type(struct uart_port *port) | |
764 | { | |
765 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
766 | ||
767 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Release the memory region(s) being used by 'port'. | |
772 | */ | |
773 | static void bfin_serial_release_port(struct uart_port *port) | |
774 | { | |
775 | } | |
776 | ||
777 | /* | |
778 | * Request the memory region(s) being used by 'port'. | |
779 | */ | |
780 | static int bfin_serial_request_port(struct uart_port *port) | |
781 | { | |
782 | return 0; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Configure/autoconfigure the port. | |
787 | */ | |
788 | static void bfin_serial_config_port(struct uart_port *port, int flags) | |
789 | { | |
790 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
791 | ||
792 | if (flags & UART_CONFIG_TYPE && | |
793 | bfin_serial_request_port(&uart->port) == 0) | |
794 | uart->port.type = PORT_BFIN; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Verify the new serial_struct (for TIOCSSERIAL). | |
799 | * The only change we allow are to the flags and type, and | |
800 | * even then only between PORT_BFIN and PORT_UNKNOWN | |
801 | */ | |
802 | static int | |
803 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
804 | { | |
805 | return 0; | |
806 | } | |
807 | ||
7d01b475 GY |
808 | /* |
809 | * Enable the IrDA function if tty->ldisc.num is N_IRDA. | |
810 | * In other cases, disable IrDA function. | |
811 | */ | |
3b8458a9 | 812 | static void bfin_serial_set_ldisc(struct uart_port *port) |
7d01b475 | 813 | { |
3b8458a9 | 814 | int line = port->line; |
7d01b475 GY |
815 | unsigned short val; |
816 | ||
3b8458a9 | 817 | if (line >= port->info->tty->driver->num) |
7d01b475 GY |
818 | return; |
819 | ||
3b8458a9 | 820 | switch (port->info->tty->ldisc.num) { |
7d01b475 GY |
821 | case N_IRDA: |
822 | val = UART_GET_GCTL(&bfin_serial_ports[line]); | |
823 | val |= (IREN | RPOLC); | |
824 | UART_PUT_GCTL(&bfin_serial_ports[line], val); | |
825 | break; | |
826 | default: | |
827 | val = UART_GET_GCTL(&bfin_serial_ports[line]); | |
828 | val &= ~(IREN | RPOLC); | |
829 | UART_PUT_GCTL(&bfin_serial_ports[line], val); | |
830 | } | |
831 | } | |
832 | ||
194de561 BW |
833 | static struct uart_ops bfin_serial_pops = { |
834 | .tx_empty = bfin_serial_tx_empty, | |
835 | .set_mctrl = bfin_serial_set_mctrl, | |
836 | .get_mctrl = bfin_serial_get_mctrl, | |
837 | .stop_tx = bfin_serial_stop_tx, | |
838 | .start_tx = bfin_serial_start_tx, | |
839 | .stop_rx = bfin_serial_stop_rx, | |
840 | .enable_ms = bfin_serial_enable_ms, | |
841 | .break_ctl = bfin_serial_break_ctl, | |
842 | .startup = bfin_serial_startup, | |
843 | .shutdown = bfin_serial_shutdown, | |
844 | .set_termios = bfin_serial_set_termios, | |
3b8458a9 | 845 | .set_ldisc = bfin_serial_set_ldisc, |
194de561 BW |
846 | .type = bfin_serial_type, |
847 | .release_port = bfin_serial_release_port, | |
848 | .request_port = bfin_serial_request_port, | |
849 | .config_port = bfin_serial_config_port, | |
850 | .verify_port = bfin_serial_verify_port, | |
851 | }; | |
852 | ||
853 | static void __init bfin_serial_init_ports(void) | |
854 | { | |
855 | static int first = 1; | |
856 | int i; | |
857 | ||
858 | if (!first) | |
859 | return; | |
860 | first = 0; | |
861 | ||
862 | for (i = 0; i < nr_ports; i++) { | |
863 | bfin_serial_ports[i].port.uartclk = get_sclk(); | |
864 | bfin_serial_ports[i].port.ops = &bfin_serial_pops; | |
865 | bfin_serial_ports[i].port.line = i; | |
866 | bfin_serial_ports[i].port.iotype = UPIO_MEM; | |
867 | bfin_serial_ports[i].port.membase = | |
868 | (void __iomem *)bfin_serial_resource[i].uart_base_addr; | |
869 | bfin_serial_ports[i].port.mapbase = | |
870 | bfin_serial_resource[i].uart_base_addr; | |
871 | bfin_serial_ports[i].port.irq = | |
872 | bfin_serial_resource[i].uart_irq; | |
873 | bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF; | |
874 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
875 | bfin_serial_ports[i].tx_done = 1; | |
876 | bfin_serial_ports[i].tx_count = 0; | |
877 | bfin_serial_ports[i].tx_dma_channel = | |
878 | bfin_serial_resource[i].uart_tx_dma_channel; | |
879 | bfin_serial_ports[i].rx_dma_channel = | |
880 | bfin_serial_resource[i].uart_rx_dma_channel; | |
881 | init_timer(&(bfin_serial_ports[i].rx_dma_timer)); | |
194de561 BW |
882 | #endif |
883 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
f30ac0ce | 884 | init_timer(&(bfin_serial_ports[i].cts_timer)); |
194de561 BW |
885 | bfin_serial_ports[i].cts_pin = |
886 | bfin_serial_resource[i].uart_cts_pin; | |
887 | bfin_serial_ports[i].rts_pin = | |
888 | bfin_serial_resource[i].uart_rts_pin; | |
889 | #endif | |
890 | bfin_serial_hw_init(&bfin_serial_ports[i]); | |
194de561 | 891 | } |
f4d640c9 | 892 | |
194de561 BW |
893 | } |
894 | ||
895 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
194de561 BW |
896 | /* |
897 | * If the port was already initialised (eg, by a boot loader), | |
898 | * try to determine the current setup. | |
899 | */ | |
900 | static void __init | |
901 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, | |
902 | int *parity, int *bits) | |
903 | { | |
904 | unsigned short status; | |
905 | ||
906 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); | |
907 | if (status == (ERBFI | ETBEI)) { | |
908 | /* ok, the port was enabled */ | |
45828b81 | 909 | u16 lcr, dlh, dll; |
194de561 BW |
910 | |
911 | lcr = UART_GET_LCR(uart); | |
912 | ||
913 | *parity = 'n'; | |
914 | if (lcr & PEN) { | |
915 | if (lcr & EPS) | |
916 | *parity = 'e'; | |
917 | else | |
918 | *parity = 'o'; | |
919 | } | |
920 | switch (lcr & 0x03) { | |
921 | case 0: *bits = 5; break; | |
922 | case 1: *bits = 6; break; | |
923 | case 2: *bits = 7; break; | |
924 | case 3: *bits = 8; break; | |
925 | } | |
926 | /* Set DLAB in LCR to Access DLL and DLH */ | |
45828b81 | 927 | UART_SET_DLAB(uart); |
194de561 BW |
928 | |
929 | dll = UART_GET_DLL(uart); | |
930 | dlh = UART_GET_DLH(uart); | |
931 | ||
932 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
45828b81 | 933 | UART_CLEAR_DLAB(uart); |
194de561 BW |
934 | |
935 | *baud = get_sclk() / (16*(dll | dlh << 8)); | |
936 | } | |
71cc2c21 | 937 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits); |
194de561 | 938 | } |
0ae53640 RG |
939 | #endif |
940 | ||
941 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK) | |
942 | static struct uart_driver bfin_serial_reg; | |
194de561 BW |
943 | |
944 | static int __init | |
945 | bfin_serial_console_setup(struct console *co, char *options) | |
946 | { | |
947 | struct bfin_serial_port *uart; | |
0ae53640 | 948 | # ifdef CONFIG_SERIAL_BFIN_CONSOLE |
194de561 BW |
949 | int baud = 57600; |
950 | int bits = 8; | |
951 | int parity = 'n'; | |
0ae53640 | 952 | # ifdef CONFIG_SERIAL_BFIN_CTSRTS |
194de561 | 953 | int flow = 'r'; |
0ae53640 | 954 | # else |
194de561 | 955 | int flow = 'n'; |
0ae53640 RG |
956 | # endif |
957 | # endif | |
194de561 BW |
958 | |
959 | /* | |
960 | * Check whether an invalid uart number has been specified, and | |
961 | * if so, search for the first available port that does have | |
962 | * console support. | |
963 | */ | |
964 | if (co->index == -1 || co->index >= nr_ports) | |
965 | co->index = 0; | |
966 | uart = &bfin_serial_ports[co->index]; | |
967 | ||
0ae53640 | 968 | # ifdef CONFIG_SERIAL_BFIN_CONSOLE |
194de561 BW |
969 | if (options) |
970 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
971 | else | |
972 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); | |
973 | ||
974 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); | |
0ae53640 RG |
975 | # else |
976 | return 0; | |
977 | # endif | |
978 | } | |
979 | #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) || | |
980 | defined (CONFIG_EARLY_PRINTK) */ | |
981 | ||
982 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
983 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) | |
984 | { | |
985 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
986 | while (!(UART_GET_LSR(uart) & THRE)) | |
987 | barrier(); | |
988 | UART_PUT_CHAR(uart, ch); | |
989 | SSYNC(); | |
990 | } | |
991 | ||
992 | /* | |
993 | * Interrupts are disabled on entering | |
994 | */ | |
995 | static void | |
996 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) | |
997 | { | |
998 | struct bfin_serial_port *uart = &bfin_serial_ports[co->index]; | |
999 | int flags = 0; | |
1000 | ||
1001 | spin_lock_irqsave(&uart->port.lock, flags); | |
1002 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); | |
1003 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
1004 | ||
194de561 BW |
1005 | } |
1006 | ||
194de561 BW |
1007 | static struct console bfin_serial_console = { |
1008 | .name = BFIN_SERIAL_NAME, | |
1009 | .write = bfin_serial_console_write, | |
1010 | .device = uart_console_device, | |
1011 | .setup = bfin_serial_console_setup, | |
1012 | .flags = CON_PRINTBUFFER, | |
1013 | .index = -1, | |
1014 | .data = &bfin_serial_reg, | |
1015 | }; | |
1016 | ||
1017 | static int __init bfin_serial_rs_console_init(void) | |
1018 | { | |
1019 | bfin_serial_init_ports(); | |
1020 | register_console(&bfin_serial_console); | |
474f1a66 SZ |
1021 | #ifdef CONFIG_KGDB_UART |
1022 | kgdb_entry_state = 0; | |
1023 | init_kgdb_uart(); | |
1024 | #endif | |
194de561 BW |
1025 | return 0; |
1026 | } | |
1027 | console_initcall(bfin_serial_rs_console_init); | |
1028 | ||
1029 | #define BFIN_SERIAL_CONSOLE &bfin_serial_console | |
1030 | #else | |
1031 | #define BFIN_SERIAL_CONSOLE NULL | |
0ae53640 RG |
1032 | #endif /* CONFIG_SERIAL_BFIN_CONSOLE */ |
1033 | ||
1034 | ||
1035 | #ifdef CONFIG_EARLY_PRINTK | |
1036 | static __init void early_serial_putc(struct uart_port *port, int ch) | |
1037 | { | |
1038 | unsigned timeout = 0xffff; | |
1039 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
1040 | ||
1041 | while ((!(UART_GET_LSR(uart) & THRE)) && --timeout) | |
1042 | cpu_relax(); | |
1043 | UART_PUT_CHAR(uart, ch); | |
1044 | } | |
1045 | ||
1046 | static __init void early_serial_write(struct console *con, const char *s, | |
1047 | unsigned int n) | |
1048 | { | |
1049 | struct bfin_serial_port *uart = &bfin_serial_ports[con->index]; | |
1050 | unsigned int i; | |
1051 | ||
1052 | for (i = 0; i < n; i++, s++) { | |
1053 | if (*s == '\n') | |
1054 | early_serial_putc(&uart->port, '\r'); | |
1055 | early_serial_putc(&uart->port, *s); | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | static struct __init console bfin_early_serial_console = { | |
1060 | .name = "early_BFuart", | |
1061 | .write = early_serial_write, | |
1062 | .device = uart_console_device, | |
1063 | .flags = CON_PRINTBUFFER, | |
1064 | .setup = bfin_serial_console_setup, | |
1065 | .index = -1, | |
1066 | .data = &bfin_serial_reg, | |
1067 | }; | |
1068 | ||
1069 | struct console __init *bfin_earlyserial_init(unsigned int port, | |
1070 | unsigned int cflag) | |
1071 | { | |
1072 | struct bfin_serial_port *uart; | |
1073 | struct ktermios t; | |
1074 | ||
1075 | if (port == -1 || port >= nr_ports) | |
1076 | port = 0; | |
1077 | bfin_serial_init_ports(); | |
1078 | bfin_early_serial_console.index = port; | |
0ae53640 RG |
1079 | uart = &bfin_serial_ports[port]; |
1080 | t.c_cflag = cflag; | |
1081 | t.c_iflag = 0; | |
1082 | t.c_oflag = 0; | |
1083 | t.c_lflag = ICANON; | |
1084 | t.c_line = port; | |
1085 | bfin_serial_set_termios(&uart->port, &t, &t); | |
1086 | return &bfin_early_serial_console; | |
1087 | } | |
1088 | ||
1089 | #endif /* CONFIG_SERIAL_BFIN_CONSOLE */ | |
194de561 BW |
1090 | |
1091 | static struct uart_driver bfin_serial_reg = { | |
1092 | .owner = THIS_MODULE, | |
1093 | .driver_name = "bfin-uart", | |
1094 | .dev_name = BFIN_SERIAL_NAME, | |
1095 | .major = BFIN_SERIAL_MAJOR, | |
1096 | .minor = BFIN_SERIAL_MINOR, | |
2ade9729 | 1097 | .nr = BFIN_UART_NR_PORTS, |
194de561 BW |
1098 | .cons = BFIN_SERIAL_CONSOLE, |
1099 | }; | |
1100 | ||
1101 | static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state) | |
1102 | { | |
1103 | struct bfin_serial_port *uart = platform_get_drvdata(dev); | |
1104 | ||
1105 | if (uart) | |
1106 | uart_suspend_port(&bfin_serial_reg, &uart->port); | |
1107 | ||
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | static int bfin_serial_resume(struct platform_device *dev) | |
1112 | { | |
1113 | struct bfin_serial_port *uart = platform_get_drvdata(dev); | |
1114 | ||
1115 | if (uart) | |
1116 | uart_resume_port(&bfin_serial_reg, &uart->port); | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static int bfin_serial_probe(struct platform_device *dev) | |
1122 | { | |
1123 | struct resource *res = dev->resource; | |
1124 | int i; | |
1125 | ||
1126 | for (i = 0; i < dev->num_resources; i++, res++) | |
1127 | if (res->flags & IORESOURCE_MEM) | |
1128 | break; | |
1129 | ||
1130 | if (i < dev->num_resources) { | |
1131 | for (i = 0; i < nr_ports; i++, res++) { | |
1132 | if (bfin_serial_ports[i].port.mapbase != res->start) | |
1133 | continue; | |
1134 | bfin_serial_ports[i].port.dev = &dev->dev; | |
1135 | uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port); | |
1136 | platform_set_drvdata(dev, &bfin_serial_ports[i]); | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | static int bfin_serial_remove(struct platform_device *pdev) | |
1144 | { | |
1145 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); | |
1146 | ||
1147 | ||
1148 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
1149 | gpio_free(uart->cts_pin); | |
1150 | gpio_free(uart->rts_pin); | |
1151 | #endif | |
1152 | ||
1153 | platform_set_drvdata(pdev, NULL); | |
1154 | ||
1155 | if (uart) | |
1156 | uart_remove_one_port(&bfin_serial_reg, &uart->port); | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static struct platform_driver bfin_serial_driver = { | |
1162 | .probe = bfin_serial_probe, | |
1163 | .remove = bfin_serial_remove, | |
1164 | .suspend = bfin_serial_suspend, | |
1165 | .resume = bfin_serial_resume, | |
1166 | .driver = { | |
1167 | .name = "bfin-uart", | |
e169c139 | 1168 | .owner = THIS_MODULE, |
194de561 BW |
1169 | }, |
1170 | }; | |
1171 | ||
1172 | static int __init bfin_serial_init(void) | |
1173 | { | |
1174 | int ret; | |
474f1a66 SZ |
1175 | #ifdef CONFIG_KGDB_UART |
1176 | struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; | |
a359cca7 | 1177 | struct ktermios t; |
474f1a66 | 1178 | #endif |
194de561 BW |
1179 | |
1180 | pr_info("Serial: Blackfin serial driver\n"); | |
1181 | ||
1182 | bfin_serial_init_ports(); | |
1183 | ||
1184 | ret = uart_register_driver(&bfin_serial_reg); | |
1185 | if (ret == 0) { | |
1186 | ret = platform_driver_register(&bfin_serial_driver); | |
1187 | if (ret) { | |
1188 | pr_debug("uart register failed\n"); | |
1189 | uart_unregister_driver(&bfin_serial_reg); | |
1190 | } | |
1191 | } | |
474f1a66 SZ |
1192 | #ifdef CONFIG_KGDB_UART |
1193 | if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) { | |
a359cca7 | 1194 | request_irq(uart->port.irq, bfin_serial_rx_int, |
474f1a66 SZ |
1195 | IRQF_DISABLED, "BFIN_UART_RX", uart); |
1196 | pr_info("Request irq for kgdb uart port\n"); | |
a359cca7 | 1197 | UART_SET_IER(uart, ERBFI); |
d5148ffa | 1198 | SSYNC(); |
474f1a66 SZ |
1199 | t.c_cflag = CS8|B57600; |
1200 | t.c_iflag = 0; | |
1201 | t.c_oflag = 0; | |
1202 | t.c_lflag = ICANON; | |
1203 | t.c_line = CONFIG_KGDB_UART_PORT; | |
1204 | bfin_serial_set_termios(&uart->port, &t, &t); | |
1205 | } | |
1206 | #endif | |
194de561 BW |
1207 | return ret; |
1208 | } | |
1209 | ||
1210 | static void __exit bfin_serial_exit(void) | |
1211 | { | |
1212 | platform_driver_unregister(&bfin_serial_driver); | |
1213 | uart_unregister_driver(&bfin_serial_reg); | |
1214 | } | |
1215 | ||
1216 | module_init(bfin_serial_init); | |
1217 | module_exit(bfin_serial_exit); | |
1218 | ||
1219 | MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>"); | |
1220 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); | |
1221 | MODULE_LICENSE("GPL"); | |
1222 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); | |
e169c139 | 1223 | MODULE_ALIAS("platform:bfin-uart"); |