Commit | Line | Data |
---|---|---|
194de561 | 1 | /* |
1ba7a3ee | 2 | * Blackfin On-Chip Serial Driver |
194de561 | 3 | * |
b06d2f20 | 4 | * Copyright 2006-2011 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 | ||
57afb399 SZ |
15 | #define DRIVER_NAME "bfin-uart" |
16 | #define pr_fmt(fmt) DRIVER_NAME ": " fmt | |
17 | ||
194de561 BW |
18 | #include <linux/module.h> |
19 | #include <linux/ioport.h> | |
5a0e3ad6 | 20 | #include <linux/gfp.h> |
599b714c | 21 | #include <linux/io.h> |
194de561 BW |
22 | #include <linux/init.h> |
23 | #include <linux/console.h> | |
24 | #include <linux/sysrq.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/tty.h> | |
27 | #include <linux/tty_flip.h> | |
28 | #include <linux/serial_core.h> | |
57afb399 SZ |
29 | #include <linux/gpio.h> |
30 | #include <linux/irq.h> | |
474f1a66 | 31 | #include <linux/kgdb.h> |
57afb399 SZ |
32 | #include <linux/slab.h> |
33 | #include <linux/dma-mapping.h> | |
194de561 | 34 | |
57afb399 | 35 | #include <asm/portmux.h> |
194de561 | 36 | #include <asm/cacheflush.h> |
57afb399 | 37 | #include <asm/dma.h> |
57afb399 | 38 | #include <asm/bfin_serial.h> |
194de561 | 39 | |
607c268e MF |
40 | #ifdef CONFIG_SERIAL_BFIN_MODULE |
41 | # undef CONFIG_EARLY_PRINTK | |
42 | #endif | |
43 | ||
0271edd4 MF |
44 | #ifdef CONFIG_SERIAL_BFIN_MODULE |
45 | # undef CONFIG_EARLY_PRINTK | |
46 | #endif | |
47 | ||
194de561 | 48 | /* UART name and device definitions */ |
57afb399 | 49 | #define BFIN_SERIAL_DEV_NAME "ttyBF" |
194de561 BW |
50 | #define BFIN_SERIAL_MAJOR 204 |
51 | #define BFIN_SERIAL_MINOR 64 | |
52 | ||
57afb399 | 53 | static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS]; |
c9607ecc | 54 | |
52e15f0e SZ |
55 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
56 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | |
57 | ||
58 | # ifndef CONFIG_SERIAL_BFIN_PIO | |
59 | # error KGDB only support UART in PIO mode. | |
60 | # endif | |
61 | ||
62 | static int kgdboc_port_line; | |
63 | static int kgdboc_break_enabled; | |
64 | #endif | |
194de561 BW |
65 | /* |
66 | * Setup for console. Argument comes from the menuconfig | |
67 | */ | |
68 | #define DMA_RX_XCOUNT 512 | |
69 | #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT) | |
70 | ||
0aef4564 | 71 | #define DMA_RX_FLUSH_JIFFIES (HZ / 50) |
194de561 BW |
72 | |
73 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
74 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); | |
75 | #else | |
194de561 | 76 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart); |
194de561 BW |
77 | #endif |
78 | ||
80d5c474 GY |
79 | static void bfin_serial_reset_irda(struct uart_port *port); |
80 | ||
d307d36a SZ |
81 | #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \ |
82 | defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS) | |
83 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) | |
84 | { | |
85 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
86 | if (uart->cts_pin < 0) | |
87 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
88 | ||
89 | /* CTS PIN is negative assertive. */ | |
90 | if (UART_GET_CTS(uart)) | |
91 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
92 | else | |
93 | return TIOCM_DSR | TIOCM_CAR; | |
94 | } | |
95 | ||
96 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
97 | { | |
98 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
99 | if (uart->rts_pin < 0) | |
100 | return; | |
101 | ||
102 | /* RTS PIN is negative assertive. */ | |
103 | if (mctrl & TIOCM_RTS) | |
104 | UART_ENABLE_RTS(uart); | |
105 | else | |
106 | UART_DISABLE_RTS(uart); | |
107 | } | |
108 | ||
109 | /* | |
110 | * Handle any change of modem status signal. | |
111 | */ | |
112 | static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id) | |
113 | { | |
114 | struct bfin_serial_port *uart = dev_id; | |
64851636 | 115 | unsigned int status = bfin_serial_get_mctrl(&uart->port); |
d307d36a | 116 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS |
64851636 SZ |
117 | struct tty_struct *tty = uart->port.state->port.tty; |
118 | ||
d307d36a | 119 | UART_CLEAR_SCTS(uart); |
64851636 SZ |
120 | if (tty->hw_stopped) { |
121 | if (status) { | |
122 | tty->hw_stopped = 0; | |
123 | uart_write_wakeup(&uart->port); | |
124 | } | |
125 | } else { | |
126 | if (!status) | |
127 | tty->hw_stopped = 1; | |
128 | } | |
d307d36a | 129 | #endif |
f5b6940c | 130 | uart_handle_cts_change(&uart->port, status & TIOCM_CTS); |
d307d36a SZ |
131 | |
132 | return IRQ_HANDLED; | |
133 | } | |
134 | #else | |
135 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) | |
136 | { | |
137 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
138 | } | |
139 | ||
140 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
141 | { | |
142 | } | |
143 | #endif | |
144 | ||
194de561 BW |
145 | /* |
146 | * interrupts are disabled on entry | |
147 | */ | |
148 | static void bfin_serial_stop_tx(struct uart_port *port) | |
149 | { | |
150 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
68a784cb | 151 | #ifdef CONFIG_SERIAL_BFIN_DMA |
ebd2c8f6 | 152 | struct circ_buf *xmit = &uart->port.state->xmit; |
68a784cb | 153 | #endif |
194de561 | 154 | |
f4d640c9 | 155 | while (!(UART_GET_LSR(uart) & TEMT)) |
0711d857 | 156 | cpu_relax(); |
f4d640c9 | 157 | |
194de561 BW |
158 | #ifdef CONFIG_SERIAL_BFIN_DMA |
159 | disable_dma(uart->tx_dma_channel); | |
0711d857 SZ |
160 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
161 | uart->port.icount.tx += uart->tx_count; | |
162 | uart->tx_count = 0; | |
163 | uart->tx_done = 1; | |
f4d640c9 | 164 | #else |
b06d2f20 | 165 | #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x) |
f4d640c9 RH |
166 | /* Clear TFI bit */ |
167 | UART_PUT_LSR(uart, TFI); | |
194de561 | 168 | #endif |
89bf6dc5 | 169 | UART_CLEAR_IER(uart, ETBEI); |
f4d640c9 | 170 | #endif |
194de561 BW |
171 | } |
172 | ||
173 | /* | |
174 | * port is locked and interrupts are disabled | |
175 | */ | |
176 | static void bfin_serial_start_tx(struct uart_port *port) | |
177 | { | |
178 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
ebd2c8f6 | 179 | struct tty_struct *tty = uart->port.state->port.tty; |
80d5c474 GY |
180 | |
181 | /* | |
182 | * To avoid losting RX interrupt, we reset IR function | |
183 | * before sending data. | |
184 | */ | |
185 | if (tty->termios->c_line == N_IRDA) | |
186 | bfin_serial_reset_irda(port); | |
194de561 BW |
187 | |
188 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
0711d857 SZ |
189 | if (uart->tx_done) |
190 | bfin_serial_dma_tx_chars(uart); | |
f4d640c9 | 191 | #else |
f4d640c9 | 192 | UART_SET_IER(uart, ETBEI); |
a359cca7 | 193 | bfin_serial_tx_chars(uart); |
f4d640c9 | 194 | #endif |
194de561 BW |
195 | } |
196 | ||
197 | /* | |
198 | * Interrupts are enabled | |
199 | */ | |
200 | static void bfin_serial_stop_rx(struct uart_port *port) | |
201 | { | |
202 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
52e15f0e | 203 | |
f4d640c9 | 204 | UART_CLEAR_IER(uart, ERBFI); |
194de561 BW |
205 | } |
206 | ||
207 | /* | |
208 | * Set the modem control timer to fire immediately. | |
209 | */ | |
210 | static void bfin_serial_enable_ms(struct uart_port *port) | |
211 | { | |
212 | } | |
213 | ||
474f1a66 | 214 | |
50e2e15a | 215 | #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO) |
8851c71e MF |
216 | # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold) |
217 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v)) | |
218 | #else | |
219 | # define UART_GET_ANOMALY_THRESHOLD(uart) 0 | |
220 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) | |
221 | #endif | |
222 | ||
194de561 | 223 | #ifdef CONFIG_SERIAL_BFIN_PIO |
194de561 BW |
224 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) |
225 | { | |
52e15f0e | 226 | struct tty_struct *tty = NULL; |
194de561 | 227 | unsigned int status, ch, flg; |
8851c71e | 228 | static struct timeval anomaly_start = { .tv_sec = 0 }; |
194de561 | 229 | |
759eb040 | 230 | status = UART_GET_LSR(uart); |
0bcfd70e MF |
231 | UART_CLEAR_LSR(uart); |
232 | ||
bb7e58f8 SZ |
233 | ch = UART_GET_CHAR(uart); |
234 | uart->port.icount.rx++; | |
194de561 | 235 | |
52e15f0e SZ |
236 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
237 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | |
cdc592d5 SZ |
238 | if (kgdb_connected && kgdboc_port_line == uart->port.line |
239 | && kgdboc_break_enabled) | |
52e15f0e SZ |
240 | if (ch == 0x3) {/* Ctrl + C */ |
241 | kgdb_breakpoint(); | |
474f1a66 | 242 | return; |
474f1a66 | 243 | } |
52e15f0e | 244 | |
ebd2c8f6 | 245 | if (!uart->port.state || !uart->port.state->port.tty) |
52e15f0e | 246 | return; |
474f1a66 | 247 | #endif |
ebd2c8f6 | 248 | tty = uart->port.state->port.tty; |
bbf275f0 | 249 | |
50e2e15a | 250 | if (ANOMALY_05000363) { |
8851c71e MF |
251 | /* The BF533 (and BF561) family of processors have a nice anomaly |
252 | * where they continuously generate characters for a "single" break. | |
bbf275f0 | 253 | * We have to basically ignore this flood until the "next" valid |
8851c71e MF |
254 | * character comes across. Due to the nature of the flood, it is |
255 | * not possible to reliably catch bytes that are sent too quickly | |
256 | * after this break. So application code talking to the Blackfin | |
257 | * which sends a break signal must allow at least 1.5 character | |
258 | * times after the end of the break for things to stabilize. This | |
259 | * timeout was picked as it must absolutely be larger than 1 | |
260 | * character time +/- some percent. So 1.5 sounds good. All other | |
261 | * Blackfin families operate properly. Woo. | |
bbf275f0 | 262 | */ |
8851c71e MF |
263 | if (anomaly_start.tv_sec) { |
264 | struct timeval curr; | |
265 | suseconds_t usecs; | |
266 | ||
267 | if ((~ch & (~ch + 1)) & 0xff) | |
268 | goto known_good_char; | |
269 | ||
270 | do_gettimeofday(&curr); | |
271 | if (curr.tv_sec - anomaly_start.tv_sec > 1) | |
272 | goto known_good_char; | |
273 | ||
274 | usecs = 0; | |
275 | if (curr.tv_sec != anomaly_start.tv_sec) | |
276 | usecs += USEC_PER_SEC; | |
277 | usecs += curr.tv_usec - anomaly_start.tv_usec; | |
278 | ||
279 | if (usecs > UART_GET_ANOMALY_THRESHOLD(uart)) | |
280 | goto known_good_char; | |
281 | ||
282 | if (ch) | |
283 | anomaly_start.tv_sec = 0; | |
284 | else | |
285 | anomaly_start = curr; | |
286 | ||
287 | return; | |
288 | ||
289 | known_good_char: | |
e482a237 | 290 | status &= ~BI; |
8851c71e | 291 | anomaly_start.tv_sec = 0; |
bbf275f0 | 292 | } |
194de561 | 293 | } |
194de561 BW |
294 | |
295 | if (status & BI) { | |
50e2e15a | 296 | if (ANOMALY_05000363) |
8851c71e MF |
297 | if (bfin_revid() < 5) |
298 | do_gettimeofday(&anomaly_start); | |
194de561 BW |
299 | uart->port.icount.brk++; |
300 | if (uart_handle_break(&uart->port)) | |
301 | goto ignore_char; | |
9808901b | 302 | status &= ~(PE | FE); |
2ac5ee47 MF |
303 | } |
304 | if (status & PE) | |
194de561 | 305 | uart->port.icount.parity++; |
2ac5ee47 | 306 | if (status & OE) |
194de561 | 307 | uart->port.icount.overrun++; |
2ac5ee47 | 308 | if (status & FE) |
194de561 | 309 | uart->port.icount.frame++; |
2ac5ee47 MF |
310 | |
311 | status &= uart->port.read_status_mask; | |
312 | ||
313 | if (status & BI) | |
314 | flg = TTY_BREAK; | |
315 | else if (status & PE) | |
316 | flg = TTY_PARITY; | |
317 | else if (status & FE) | |
318 | flg = TTY_FRAME; | |
319 | else | |
194de561 BW |
320 | flg = TTY_NORMAL; |
321 | ||
322 | if (uart_handle_sysrq_char(&uart->port, ch)) | |
323 | goto ignore_char; | |
194de561 | 324 | |
2ac5ee47 MF |
325 | uart_insert_char(&uart->port, status, OE, ch, flg); |
326 | ||
327 | ignore_char: | |
328 | tty_flip_buffer_push(tty); | |
194de561 BW |
329 | } |
330 | ||
331 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) | |
332 | { | |
ebd2c8f6 | 333 | struct circ_buf *xmit = &uart->port.state->xmit; |
194de561 | 334 | |
194de561 | 335 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
b06d2f20 | 336 | #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x) |
5ffdeea2 SZ |
337 | /* Clear TFI bit */ |
338 | UART_PUT_LSR(uart, TFI); | |
339 | #endif | |
0efa4f2c SZ |
340 | /* Anomaly notes: |
341 | * 05000215 - we always clear ETBEI within last UART TX | |
342 | * interrupt to end a string. It is always set | |
343 | * when start a new tx. | |
344 | */ | |
5ffdeea2 | 345 | UART_CLEAR_IER(uart, ETBEI); |
194de561 BW |
346 | return; |
347 | } | |
348 | ||
f30ac0ce SZ |
349 | if (uart->port.x_char) { |
350 | UART_PUT_CHAR(uart, uart->port.x_char); | |
351 | uart->port.icount.tx++; | |
352 | uart->port.x_char = 0; | |
353 | } | |
354 | ||
759eb040 SZ |
355 | while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) { |
356 | UART_PUT_CHAR(uart, xmit->buf[xmit->tail]); | |
357 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
358 | uart->port.icount.tx++; | |
759eb040 | 359 | } |
194de561 BW |
360 | |
361 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
362 | uart_write_wakeup(&uart->port); | |
194de561 BW |
363 | } |
364 | ||
5c4e472b AL |
365 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) |
366 | { | |
367 | struct bfin_serial_port *uart = dev_id; | |
368 | ||
0bcfd70e | 369 | while (UART_GET_LSR(uart) & DR) |
f4d640c9 | 370 | bfin_serial_rx_chars(uart); |
759eb040 | 371 | |
5c4e472b AL |
372 | return IRQ_HANDLED; |
373 | } | |
374 | ||
375 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) | |
194de561 BW |
376 | { |
377 | struct bfin_serial_port *uart = dev_id; | |
194de561 | 378 | |
f4d640c9 | 379 | spin_lock(&uart->port.lock); |
0bcfd70e | 380 | if (UART_GET_LSR(uart) & THRE) |
f4d640c9 | 381 | bfin_serial_tx_chars(uart); |
f4d640c9 | 382 | spin_unlock(&uart->port.lock); |
759eb040 | 383 | |
194de561 BW |
384 | return IRQ_HANDLED; |
385 | } | |
4cb4f22b | 386 | #endif |
194de561 | 387 | |
194de561 BW |
388 | #ifdef CONFIG_SERIAL_BFIN_DMA |
389 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) | |
390 | { | |
ebd2c8f6 | 391 | struct circ_buf *xmit = &uart->port.state->xmit; |
194de561 | 392 | |
194de561 BW |
393 | uart->tx_done = 0; |
394 | ||
1b73351c | 395 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
0711d857 | 396 | uart->tx_count = 0; |
1b73351c SZ |
397 | uart->tx_done = 1; |
398 | return; | |
399 | } | |
400 | ||
194de561 BW |
401 | if (uart->port.x_char) { |
402 | UART_PUT_CHAR(uart, uart->port.x_char); | |
403 | uart->port.icount.tx++; | |
404 | uart->port.x_char = 0; | |
194de561 | 405 | } |
1b73351c | 406 | |
194de561 BW |
407 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); |
408 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) | |
409 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; | |
410 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), | |
411 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); | |
412 | set_dma_config(uart->tx_dma_channel, | |
413 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, | |
414 | INTR_ON_BUF, | |
415 | DIMENSION_LINEAR, | |
2047e40d MH |
416 | DATA_SIZE_8, |
417 | DMA_SYNC_RESTART)); | |
194de561 BW |
418 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); |
419 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); | |
420 | set_dma_x_modify(uart->tx_dma_channel, 1); | |
f9d36da9 | 421 | SSYNC(); |
194de561 | 422 | enable_dma(uart->tx_dma_channel); |
99ee7b5f | 423 | |
f4d640c9 | 424 | UART_SET_IER(uart, ETBEI); |
194de561 BW |
425 | } |
426 | ||
2ac5ee47 | 427 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) |
194de561 | 428 | { |
ebd2c8f6 | 429 | struct tty_struct *tty = uart->port.state->port.tty; |
194de561 BW |
430 | int i, flg, status; |
431 | ||
432 | status = UART_GET_LSR(uart); | |
0bcfd70e MF |
433 | UART_CLEAR_LSR(uart); |
434 | ||
56f5de8f SZ |
435 | uart->port.icount.rx += |
436 | CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, | |
437 | UART_XMIT_SIZE); | |
194de561 BW |
438 | |
439 | if (status & BI) { | |
440 | uart->port.icount.brk++; | |
441 | if (uart_handle_break(&uart->port)) | |
442 | goto dma_ignore_char; | |
9808901b | 443 | status &= ~(PE | FE); |
2ac5ee47 MF |
444 | } |
445 | if (status & PE) | |
194de561 | 446 | uart->port.icount.parity++; |
2ac5ee47 | 447 | if (status & OE) |
194de561 | 448 | uart->port.icount.overrun++; |
2ac5ee47 | 449 | if (status & FE) |
194de561 | 450 | uart->port.icount.frame++; |
2ac5ee47 MF |
451 | |
452 | status &= uart->port.read_status_mask; | |
453 | ||
454 | if (status & BI) | |
455 | flg = TTY_BREAK; | |
456 | else if (status & PE) | |
457 | flg = TTY_PARITY; | |
458 | else if (status & FE) | |
459 | flg = TTY_FRAME; | |
460 | else | |
194de561 BW |
461 | flg = TTY_NORMAL; |
462 | ||
8c4210e3 | 463 | for (i = uart->rx_dma_buf.tail; ; i++) { |
56f5de8f SZ |
464 | if (i >= UART_XMIT_SIZE) |
465 | i = 0; | |
8c4210e3 SZ |
466 | if (i == uart->rx_dma_buf.head) |
467 | break; | |
56f5de8f SZ |
468 | if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) |
469 | uart_insert_char(&uart->port, status, OE, | |
470 | uart->rx_dma_buf.buf[i], flg); | |
194de561 | 471 | } |
2ac5ee47 MF |
472 | |
473 | dma_ignore_char: | |
194de561 BW |
474 | tty_flip_buffer_push(tty); |
475 | } | |
476 | ||
477 | void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) | |
478 | { | |
59e4e3e6 | 479 | int x_pos, pos; |
68a784cb | 480 | |
0f66e50a SZ |
481 | dma_disable_irq_nosync(uart->rx_dma_channel); |
482 | spin_lock_bh(&uart->rx_lock); | |
194de561 | 483 | |
8516c568 SZ |
484 | /* 2D DMA RX buffer ring is used. Because curr_y_count and |
485 | * curr_x_count can't be read as an atomic operation, | |
486 | * curr_y_count should be read before curr_x_count. When | |
487 | * curr_x_count is read, curr_y_count may already indicate | |
488 | * next buffer line. But, the position calculated here is | |
489 | * still indicate the old line. The wrong position data may | |
490 | * be smaller than current buffer tail, which cause garbages | |
491 | * are received if it is not prohibit. | |
492 | */ | |
56f5de8f SZ |
493 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); |
494 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); | |
495 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; | |
35ff6935 | 496 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0) |
56f5de8f SZ |
497 | uart->rx_dma_nrows = 0; |
498 | x_pos = DMA_RX_XCOUNT - x_pos; | |
194de561 BW |
499 | if (x_pos == DMA_RX_XCOUNT) |
500 | x_pos = 0; | |
501 | ||
502 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; | |
8516c568 SZ |
503 | /* Ignore receiving data if new position is in the same line of |
504 | * current buffer tail and small. | |
505 | */ | |
506 | if (pos > uart->rx_dma_buf.tail || | |
507 | uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) { | |
56f5de8f | 508 | uart->rx_dma_buf.head = pos; |
194de561 | 509 | bfin_serial_dma_rx_chars(uart); |
56f5de8f | 510 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; |
194de561 | 511 | } |
0aef4564 | 512 | |
0f66e50a | 513 | spin_unlock_bh(&uart->rx_lock); |
2860b791 | 514 | dma_enable_irq(uart->rx_dma_channel); |
68a784cb | 515 | |
0a278423 | 516 | mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES); |
194de561 BW |
517 | } |
518 | ||
519 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) | |
520 | { | |
521 | struct bfin_serial_port *uart = dev_id; | |
ebd2c8f6 | 522 | struct circ_buf *xmit = &uart->port.state->xmit; |
194de561 BW |
523 | |
524 | spin_lock(&uart->port.lock); | |
525 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { | |
194de561 | 526 | disable_dma(uart->tx_dma_channel); |
0711d857 | 527 | clear_dma_irqstat(uart->tx_dma_channel); |
0efa4f2c SZ |
528 | /* Anomaly notes: |
529 | * 05000215 - we always clear ETBEI within last UART TX | |
530 | * interrupt to end a string. It is always set | |
531 | * when start a new tx. | |
532 | */ | |
f4d640c9 | 533 | UART_CLEAR_IER(uart, ETBEI); |
0711d857 | 534 | uart->port.icount.tx += uart->tx_count; |
239c25b1 | 535 | if (!(xmit->tail == 0 && xmit->head == 0)) { |
60f4b002 | 536 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
1b73351c | 537 | |
60f4b002 SZ |
538 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
539 | uart_write_wakeup(&uart->port); | |
540 | } | |
56f5de8f | 541 | |
1b73351c | 542 | bfin_serial_dma_tx_chars(uart); |
194de561 BW |
543 | } |
544 | ||
545 | spin_unlock(&uart->port.lock); | |
546 | return IRQ_HANDLED; | |
547 | } | |
548 | ||
549 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) | |
550 | { | |
551 | struct bfin_serial_port *uart = dev_id; | |
552 | unsigned short irqstat; | |
35ff6935 | 553 | int x_pos, pos; |
0711d857 | 554 | |
0f66e50a | 555 | spin_lock(&uart->rx_lock); |
194de561 BW |
556 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); |
557 | clear_dma_irqstat(uart->rx_dma_channel); | |
8516c568 SZ |
558 | |
559 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); | |
35ff6935 | 560 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); |
8516c568 | 561 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; |
35ff6935 | 562 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0) |
8516c568 SZ |
563 | uart->rx_dma_nrows = 0; |
564 | ||
565 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT; | |
566 | if (pos > uart->rx_dma_buf.tail || | |
567 | uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) { | |
568 | uart->rx_dma_buf.head = pos; | |
569 | bfin_serial_dma_rx_chars(uart); | |
570 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; | |
571 | } | |
572 | ||
0f66e50a | 573 | spin_unlock(&uart->rx_lock); |
0aef4564 | 574 | |
194de561 BW |
575 | return IRQ_HANDLED; |
576 | } | |
577 | #endif | |
578 | ||
579 | /* | |
580 | * Return TIOCSER_TEMT when transmitter is not busy. | |
581 | */ | |
582 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) | |
583 | { | |
584 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
585 | unsigned short lsr; | |
586 | ||
587 | lsr = UART_GET_LSR(uart); | |
588 | if (lsr & TEMT) | |
589 | return TIOCSER_TEMT; | |
590 | else | |
591 | return 0; | |
592 | } | |
593 | ||
194de561 BW |
594 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) |
595 | { | |
cf686762 MF |
596 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
597 | u16 lcr = UART_GET_LCR(uart); | |
598 | if (break_state) | |
599 | lcr |= SB; | |
600 | else | |
601 | lcr &= ~SB; | |
602 | UART_PUT_LCR(uart, lcr); | |
603 | SSYNC(); | |
194de561 BW |
604 | } |
605 | ||
606 | static int bfin_serial_startup(struct uart_port *port) | |
607 | { | |
608 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
609 | ||
610 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
611 | dma_addr_t dma_handle; | |
612 | ||
613 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { | |
614 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); | |
615 | return -EBUSY; | |
616 | } | |
617 | ||
618 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { | |
619 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); | |
620 | free_dma(uart->rx_dma_channel); | |
621 | return -EBUSY; | |
622 | } | |
623 | ||
624 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); | |
625 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); | |
626 | ||
627 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); | |
628 | uart->rx_dma_buf.head = 0; | |
629 | uart->rx_dma_buf.tail = 0; | |
630 | uart->rx_dma_nrows = 0; | |
631 | ||
632 | set_dma_config(uart->rx_dma_channel, | |
633 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, | |
634 | INTR_ON_ROW, DIMENSION_2D, | |
2047e40d MH |
635 | DATA_SIZE_8, |
636 | DMA_SYNC_RESTART)); | |
194de561 BW |
637 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); |
638 | set_dma_x_modify(uart->rx_dma_channel, 1); | |
639 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); | |
640 | set_dma_y_modify(uart->rx_dma_channel, 1); | |
641 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); | |
642 | enable_dma(uart->rx_dma_channel); | |
643 | ||
644 | uart->rx_dma_timer.data = (unsigned long)(uart); | |
645 | uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; | |
646 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; | |
647 | add_timer(&(uart->rx_dma_timer)); | |
648 | #else | |
6f95570e | 649 | # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
52e15f0e SZ |
650 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) |
651 | if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled) | |
652 | kgdboc_break_enabled = 0; | |
653 | else { | |
654 | # endif | |
9cfb5c05 | 655 | if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0, |
a359cca7 | 656 | "BFIN_UART_RX", uart)) { |
194de561 BW |
657 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); |
658 | return -EBUSY; | |
659 | } | |
660 | ||
661 | if (request_irq | |
9cfb5c05 | 662 | (uart->tx_irq, bfin_serial_tx_int, 0, |
194de561 BW |
663 | "BFIN_UART_TX", uart)) { |
664 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); | |
47918f05 | 665 | free_irq(uart->rx_irq, uart); |
194de561 BW |
666 | return -EBUSY; |
667 | } | |
ab2375f2 SZ |
668 | |
669 | # ifdef CONFIG_BF54x | |
670 | { | |
b6100992 SZ |
671 | /* |
672 | * UART2 and UART3 on BF548 share interrupt PINs and DMA | |
673 | * controllers with SPORT2 and SPORT3. UART rx and tx | |
674 | * interrupts are generated in PIO mode only when configure | |
675 | * their peripheral mapping registers properly, which means | |
676 | * request corresponding DMA channels in PIO mode as well. | |
677 | */ | |
ab2375f2 SZ |
678 | unsigned uart_dma_ch_rx, uart_dma_ch_tx; |
679 | ||
47918f05 | 680 | switch (uart->rx_irq) { |
ab2375f2 SZ |
681 | case IRQ_UART3_RX: |
682 | uart_dma_ch_rx = CH_UART3_RX; | |
683 | uart_dma_ch_tx = CH_UART3_TX; | |
684 | break; | |
685 | case IRQ_UART2_RX: | |
686 | uart_dma_ch_rx = CH_UART2_RX; | |
687 | uart_dma_ch_tx = CH_UART2_TX; | |
688 | break; | |
689 | default: | |
690 | uart_dma_ch_rx = uart_dma_ch_tx = 0; | |
691 | break; | |
692 | }; | |
693 | ||
694 | if (uart_dma_ch_rx && | |
695 | request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) { | |
696 | printk(KERN_NOTICE"Fail to attach UART interrupt\n"); | |
47918f05 SZ |
697 | free_irq(uart->rx_irq, uart); |
698 | free_irq(uart->tx_irq, uart); | |
ab2375f2 SZ |
699 | return -EBUSY; |
700 | } | |
701 | if (uart_dma_ch_tx && | |
702 | request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) { | |
703 | printk(KERN_NOTICE "Fail to attach UART interrupt\n"); | |
704 | free_dma(uart_dma_ch_rx); | |
47918f05 SZ |
705 | free_irq(uart->rx_irq, uart); |
706 | free_irq(uart->tx_irq, uart); | |
ab2375f2 SZ |
707 | return -EBUSY; |
708 | } | |
709 | } | |
710 | # endif | |
6f95570e | 711 | # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
52e15f0e SZ |
712 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) |
713 | } | |
714 | # endif | |
6f95570e SZ |
715 | #endif |
716 | ||
717 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | |
718 | if (uart->cts_pin >= 0) { | |
719 | if (request_irq(gpio_to_irq(uart->cts_pin), | |
720 | bfin_serial_mctrl_cts_int, | |
721 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | | |
9cfb5c05 | 722 | 0, "BFIN_UART_CTS", uart)) { |
6f95570e | 723 | uart->cts_pin = -1; |
a89f2466 | 724 | pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n"); |
6f95570e SZ |
725 | } |
726 | } | |
32b44568 SZ |
727 | if (uart->rts_pin >= 0) { |
728 | if (gpio_request(uart->rts_pin, DRIVER_NAME)) { | |
729 | pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin); | |
730 | uart->rts_pin = -1; | |
731 | } else | |
732 | gpio_direction_output(uart->rts_pin, 0); | |
733 | } | |
194de561 | 734 | #endif |
d307d36a | 735 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS |
b48dc711 SZ |
736 | if (uart->cts_pin >= 0) { |
737 | if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int, | |
738 | IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) { | |
739 | uart->cts_pin = -1; | |
740 | dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n"); | |
741 | } | |
d307d36a | 742 | |
b48dc711 SZ |
743 | /* CTS RTS PINs are negative assertive. */ |
744 | UART_PUT_MCR(uart, ACTS); | |
745 | UART_SET_IER(uart, EDSSI); | |
746 | } | |
d307d36a SZ |
747 | #endif |
748 | ||
f4d640c9 | 749 | UART_SET_IER(uart, ERBFI); |
194de561 BW |
750 | return 0; |
751 | } | |
752 | ||
753 | static void bfin_serial_shutdown(struct uart_port *port) | |
754 | { | |
755 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
756 | ||
757 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
758 | disable_dma(uart->tx_dma_channel); | |
759 | free_dma(uart->tx_dma_channel); | |
760 | disable_dma(uart->rx_dma_channel); | |
761 | free_dma(uart->rx_dma_channel); | |
762 | del_timer(&(uart->rx_dma_timer)); | |
75b780bd | 763 | dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0); |
194de561 | 764 | #else |
ab2375f2 SZ |
765 | #ifdef CONFIG_BF54x |
766 | switch (uart->port.irq) { | |
767 | case IRQ_UART3_RX: | |
768 | free_dma(CH_UART3_RX); | |
769 | free_dma(CH_UART3_TX); | |
770 | break; | |
771 | case IRQ_UART2_RX: | |
772 | free_dma(CH_UART2_RX); | |
773 | free_dma(CH_UART2_TX); | |
774 | break; | |
775 | default: | |
776 | break; | |
777 | }; | |
474f1a66 | 778 | #endif |
47918f05 SZ |
779 | free_irq(uart->rx_irq, uart); |
780 | free_irq(uart->tx_irq, uart); | |
194de561 | 781 | #endif |
6f95570e | 782 | |
d307d36a | 783 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
6f95570e SZ |
784 | if (uart->cts_pin >= 0) |
785 | free_irq(gpio_to_irq(uart->cts_pin), uart); | |
32b44568 SZ |
786 | if (uart->rts_pin >= 0) |
787 | gpio_free(uart->rts_pin); | |
d307d36a SZ |
788 | #endif |
789 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS | |
57afb399 | 790 | if (uart->cts_pin >= 0) |
d307d36a SZ |
791 | free_irq(uart->status_irq, uart); |
792 | #endif | |
194de561 BW |
793 | } |
794 | ||
795 | static void | |
796 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, | |
797 | struct ktermios *old) | |
798 | { | |
799 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
800 | unsigned long flags; | |
801 | unsigned int baud, quot; | |
0c44a86d | 802 | unsigned short val, ier, lcr = 0; |
194de561 BW |
803 | |
804 | switch (termios->c_cflag & CSIZE) { | |
805 | case CS8: | |
806 | lcr = WLS(8); | |
807 | break; | |
808 | case CS7: | |
809 | lcr = WLS(7); | |
810 | break; | |
811 | case CS6: | |
812 | lcr = WLS(6); | |
813 | break; | |
814 | case CS5: | |
815 | lcr = WLS(5); | |
816 | break; | |
817 | default: | |
818 | printk(KERN_ERR "%s: word lengh not supported\n", | |
71cc2c21 | 819 | __func__); |
194de561 BW |
820 | } |
821 | ||
84507794 SZ |
822 | /* Anomaly notes: |
823 | * 05000231 - STOP bit is always set to 1 whatever the user is set. | |
824 | */ | |
825 | if (termios->c_cflag & CSTOPB) { | |
826 | if (ANOMALY_05000231) | |
827 | printk(KERN_WARNING "STOP bits other than 1 is not " | |
828 | "supported in case of anomaly 05000231.\n"); | |
829 | else | |
830 | lcr |= STB; | |
831 | } | |
19aa6382 | 832 | if (termios->c_cflag & PARENB) |
194de561 | 833 | lcr |= PEN; |
19aa6382 MF |
834 | if (!(termios->c_cflag & PARODD)) |
835 | lcr |= EPS; | |
836 | if (termios->c_cflag & CMSPAR) | |
837 | lcr |= STP; | |
194de561 | 838 | |
5bb06b62 SZ |
839 | spin_lock_irqsave(&uart->port.lock, flags); |
840 | ||
2ac5ee47 MF |
841 | port->read_status_mask = OE; |
842 | if (termios->c_iflag & INPCK) | |
843 | port->read_status_mask |= (FE | PE); | |
844 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
845 | port->read_status_mask |= BI; | |
194de561 | 846 | |
2ac5ee47 MF |
847 | /* |
848 | * Characters to ignore | |
849 | */ | |
850 | port->ignore_status_mask = 0; | |
851 | if (termios->c_iflag & IGNPAR) | |
852 | port->ignore_status_mask |= FE | PE; | |
853 | if (termios->c_iflag & IGNBRK) { | |
854 | port->ignore_status_mask |= BI; | |
855 | /* | |
856 | * If we're ignoring parity and break indicators, | |
857 | * ignore overruns too (for real raw support). | |
858 | */ | |
859 | if (termios->c_iflag & IGNPAR) | |
860 | port->ignore_status_mask |= OE; | |
861 | } | |
194de561 BW |
862 | |
863 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
ca3e442e GY |
864 | quot = uart_get_divisor(port, baud); |
865 | ||
866 | /* If discipline is not IRDA, apply ANOMALY_05000230 */ | |
867 | if (termios->c_line != N_IRDA) | |
868 | quot -= ANOMALY_05000230; | |
869 | ||
8851c71e MF |
870 | UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15); |
871 | ||
194de561 BW |
872 | /* Disable UART */ |
873 | ier = UART_GET_IER(uart); | |
1feaa51d | 874 | UART_DISABLE_INTS(uart); |
194de561 | 875 | |
b06d2f20 | 876 | /* Set DLAB in LCR to Access CLK */ |
45828b81 | 877 | UART_SET_DLAB(uart); |
194de561 | 878 | |
b06d2f20 | 879 | UART_PUT_CLK(uart, quot); |
194de561 BW |
880 | SSYNC(); |
881 | ||
882 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
45828b81 | 883 | UART_CLEAR_DLAB(uart); |
194de561 BW |
884 | |
885 | UART_PUT_LCR(uart, lcr); | |
886 | ||
887 | /* Enable UART */ | |
1feaa51d | 888 | UART_ENABLE_INTS(uart, ier); |
194de561 BW |
889 | |
890 | val = UART_GET_GCTL(uart); | |
891 | val |= UCEN; | |
892 | UART_PUT_GCTL(uart, val); | |
893 | ||
b3ef5aba GY |
894 | /* Port speed changed, update the per-port timeout. */ |
895 | uart_update_timeout(port, termios->c_cflag, baud); | |
896 | ||
194de561 BW |
897 | spin_unlock_irqrestore(&uart->port.lock, flags); |
898 | } | |
899 | ||
900 | static const char *bfin_serial_type(struct uart_port *port) | |
901 | { | |
902 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
903 | ||
904 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; | |
905 | } | |
906 | ||
907 | /* | |
908 | * Release the memory region(s) being used by 'port'. | |
909 | */ | |
910 | static void bfin_serial_release_port(struct uart_port *port) | |
911 | { | |
912 | } | |
913 | ||
914 | /* | |
915 | * Request the memory region(s) being used by 'port'. | |
916 | */ | |
917 | static int bfin_serial_request_port(struct uart_port *port) | |
918 | { | |
919 | return 0; | |
920 | } | |
921 | ||
922 | /* | |
923 | * Configure/autoconfigure the port. | |
924 | */ | |
925 | static void bfin_serial_config_port(struct uart_port *port, int flags) | |
926 | { | |
927 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
928 | ||
929 | if (flags & UART_CONFIG_TYPE && | |
930 | bfin_serial_request_port(&uart->port) == 0) | |
931 | uart->port.type = PORT_BFIN; | |
932 | } | |
933 | ||
934 | /* | |
935 | * Verify the new serial_struct (for TIOCSSERIAL). | |
936 | * The only change we allow are to the flags and type, and | |
937 | * even then only between PORT_BFIN and PORT_UNKNOWN | |
938 | */ | |
939 | static int | |
940 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
941 | { | |
942 | return 0; | |
943 | } | |
944 | ||
7d01b475 GY |
945 | /* |
946 | * Enable the IrDA function if tty->ldisc.num is N_IRDA. | |
947 | * In other cases, disable IrDA function. | |
948 | */ | |
d87d9b7d | 949 | static void bfin_serial_set_ldisc(struct uart_port *port, int ld) |
7d01b475 | 950 | { |
57afb399 | 951 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
7d01b475 GY |
952 | unsigned short val; |
953 | ||
d87d9b7d | 954 | switch (ld) { |
7d01b475 | 955 | case N_IRDA: |
57afb399 | 956 | val = UART_GET_GCTL(uart); |
b06d2f20 | 957 | val |= (UMOD_IRDA | RPOLC); |
57afb399 | 958 | UART_PUT_GCTL(uart, val); |
7d01b475 GY |
959 | break; |
960 | default: | |
57afb399 | 961 | val = UART_GET_GCTL(uart); |
b06d2f20 | 962 | val &= ~(UMOD_MASK | RPOLC); |
57afb399 | 963 | UART_PUT_GCTL(uart, val); |
7d01b475 GY |
964 | } |
965 | } | |
966 | ||
6f95570e SZ |
967 | static void bfin_serial_reset_irda(struct uart_port *port) |
968 | { | |
57afb399 | 969 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
6f95570e SZ |
970 | unsigned short val; |
971 | ||
57afb399 | 972 | val = UART_GET_GCTL(uart); |
b06d2f20 | 973 | val &= ~(UMOD_MASK | RPOLC); |
57afb399 | 974 | UART_PUT_GCTL(uart, val); |
6f95570e | 975 | SSYNC(); |
b06d2f20 | 976 | val |= (UMOD_IRDA | RPOLC); |
57afb399 | 977 | UART_PUT_GCTL(uart, val); |
6f95570e SZ |
978 | SSYNC(); |
979 | } | |
980 | ||
52e15f0e | 981 | #ifdef CONFIG_CONSOLE_POLL |
0efa4f2c SZ |
982 | /* Anomaly notes: |
983 | * 05000099 - Because we only use THRE in poll_put and DR in poll_get, | |
984 | * losing other bits of UART_LSR is not a problem here. | |
985 | */ | |
52e15f0e SZ |
986 | static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr) |
987 | { | |
988 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
989 | ||
990 | while (!(UART_GET_LSR(uart) & THRE)) | |
991 | cpu_relax(); | |
992 | ||
993 | UART_CLEAR_DLAB(uart); | |
994 | UART_PUT_CHAR(uart, (unsigned char)chr); | |
995 | } | |
996 | ||
997 | static int bfin_serial_poll_get_char(struct uart_port *port) | |
998 | { | |
999 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
1000 | unsigned char chr; | |
1001 | ||
1002 | while (!(UART_GET_LSR(uart) & DR)) | |
1003 | cpu_relax(); | |
1004 | ||
1005 | UART_CLEAR_DLAB(uart); | |
1006 | chr = UART_GET_CHAR(uart); | |
1007 | ||
1008 | return chr; | |
1009 | } | |
1010 | #endif | |
1011 | ||
1012 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ | |
1013 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | |
1014 | static void bfin_kgdboc_port_shutdown(struct uart_port *port) | |
1015 | { | |
1016 | if (kgdboc_break_enabled) { | |
1017 | kgdboc_break_enabled = 0; | |
1018 | bfin_serial_shutdown(port); | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | static int bfin_kgdboc_port_startup(struct uart_port *port) | |
1023 | { | |
1024 | kgdboc_port_line = port->line; | |
1025 | kgdboc_break_enabled = !bfin_serial_startup(port); | |
1026 | return 0; | |
1027 | } | |
1028 | #endif | |
1029 | ||
194de561 BW |
1030 | static struct uart_ops bfin_serial_pops = { |
1031 | .tx_empty = bfin_serial_tx_empty, | |
1032 | .set_mctrl = bfin_serial_set_mctrl, | |
1033 | .get_mctrl = bfin_serial_get_mctrl, | |
1034 | .stop_tx = bfin_serial_stop_tx, | |
1035 | .start_tx = bfin_serial_start_tx, | |
1036 | .stop_rx = bfin_serial_stop_rx, | |
1037 | .enable_ms = bfin_serial_enable_ms, | |
1038 | .break_ctl = bfin_serial_break_ctl, | |
1039 | .startup = bfin_serial_startup, | |
1040 | .shutdown = bfin_serial_shutdown, | |
1041 | .set_termios = bfin_serial_set_termios, | |
3b8458a9 | 1042 | .set_ldisc = bfin_serial_set_ldisc, |
194de561 BW |
1043 | .type = bfin_serial_type, |
1044 | .release_port = bfin_serial_release_port, | |
1045 | .request_port = bfin_serial_request_port, | |
1046 | .config_port = bfin_serial_config_port, | |
1047 | .verify_port = bfin_serial_verify_port, | |
52e15f0e SZ |
1048 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
1049 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | |
1050 | .kgdboc_port_startup = bfin_kgdboc_port_startup, | |
1051 | .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown, | |
1052 | #endif | |
1053 | #ifdef CONFIG_CONSOLE_POLL | |
1054 | .poll_put_char = bfin_serial_poll_put_char, | |
1055 | .poll_get_char = bfin_serial_poll_get_char, | |
1056 | #endif | |
194de561 BW |
1057 | }; |
1058 | ||
b6efa1ea | 1059 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK) |
194de561 BW |
1060 | /* |
1061 | * If the port was already initialised (eg, by a boot loader), | |
1062 | * try to determine the current setup. | |
1063 | */ | |
1064 | static void __init | |
1065 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, | |
1066 | int *parity, int *bits) | |
1067 | { | |
1068 | unsigned short status; | |
1069 | ||
1070 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); | |
1071 | if (status == (ERBFI | ETBEI)) { | |
1072 | /* ok, the port was enabled */ | |
b06d2f20 | 1073 | u16 lcr, clk; |
194de561 BW |
1074 | |
1075 | lcr = UART_GET_LCR(uart); | |
1076 | ||
1077 | *parity = 'n'; | |
1078 | if (lcr & PEN) { | |
1079 | if (lcr & EPS) | |
1080 | *parity = 'e'; | |
1081 | else | |
1082 | *parity = 'o'; | |
1083 | } | |
1084 | switch (lcr & 0x03) { | |
bb7e58f8 SZ |
1085 | case 0: |
1086 | *bits = 5; | |
1087 | break; | |
1088 | case 1: | |
1089 | *bits = 6; | |
1090 | break; | |
1091 | case 2: | |
1092 | *bits = 7; | |
1093 | break; | |
1094 | case 3: | |
1095 | *bits = 8; | |
1096 | break; | |
194de561 | 1097 | } |
b06d2f20 | 1098 | /* Set DLAB in LCR to Access CLK */ |
45828b81 | 1099 | UART_SET_DLAB(uart); |
194de561 | 1100 | |
b06d2f20 | 1101 | clk = UART_GET_CLK(uart); |
194de561 BW |
1102 | |
1103 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
45828b81 | 1104 | UART_CLEAR_DLAB(uart); |
194de561 | 1105 | |
b06d2f20 | 1106 | *baud = get_sclk() / (16*clk); |
194de561 | 1107 | } |
71cc2c21 | 1108 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits); |
194de561 | 1109 | } |
0ae53640 | 1110 | |
0ae53640 | 1111 | static struct uart_driver bfin_serial_reg; |
194de561 | 1112 | |
57afb399 SZ |
1113 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) |
1114 | { | |
1115 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
1116 | while (!(UART_GET_LSR(uart) & THRE)) | |
1117 | barrier(); | |
1118 | UART_PUT_CHAR(uart, ch); | |
1119 | } | |
1120 | ||
1121 | #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) || | |
1122 | defined (CONFIG_EARLY_PRINTK) */ | |
1123 | ||
1124 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
1125 | #define CLASS_BFIN_CONSOLE "bfin-console" | |
1126 | /* | |
1127 | * Interrupts are disabled on entering | |
1128 | */ | |
1129 | static void | |
1130 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) | |
1131 | { | |
1132 | struct bfin_serial_port *uart = bfin_serial_ports[co->index]; | |
1133 | unsigned long flags; | |
1134 | ||
1135 | spin_lock_irqsave(&uart->port.lock, flags); | |
1136 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); | |
1137 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
1138 | ||
1139 | } | |
1140 | ||
194de561 BW |
1141 | static int __init |
1142 | bfin_serial_console_setup(struct console *co, char *options) | |
1143 | { | |
1144 | struct bfin_serial_port *uart; | |
1145 | int baud = 57600; | |
1146 | int bits = 8; | |
1147 | int parity = 'n'; | |
d307d36a SZ |
1148 | # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \ |
1149 | defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS) | |
194de561 | 1150 | int flow = 'r'; |
b6efa1ea | 1151 | # else |
194de561 | 1152 | int flow = 'n'; |
0ae53640 | 1153 | # endif |
194de561 BW |
1154 | |
1155 | /* | |
1156 | * Check whether an invalid uart number has been specified, and | |
1157 | * if so, search for the first available port that does have | |
1158 | * console support. | |
1159 | */ | |
57afb399 SZ |
1160 | if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS) |
1161 | return -ENODEV; | |
1162 | ||
1163 | uart = bfin_serial_ports[co->index]; | |
1164 | if (!uart) | |
1165 | return -ENODEV; | |
194de561 BW |
1166 | |
1167 | if (options) | |
1168 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1169 | else | |
1170 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); | |
1171 | ||
1172 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); | |
0ae53640 | 1173 | } |
194de561 | 1174 | |
194de561 | 1175 | static struct console bfin_serial_console = { |
57afb399 | 1176 | .name = BFIN_SERIAL_DEV_NAME, |
194de561 BW |
1177 | .write = bfin_serial_console_write, |
1178 | .device = uart_console_device, | |
1179 | .setup = bfin_serial_console_setup, | |
1180 | .flags = CON_PRINTBUFFER, | |
1181 | .index = -1, | |
1182 | .data = &bfin_serial_reg, | |
1183 | }; | |
bb7e58f8 | 1184 | #define BFIN_SERIAL_CONSOLE (&bfin_serial_console) |
194de561 BW |
1185 | #else |
1186 | #define BFIN_SERIAL_CONSOLE NULL | |
0ae53640 RG |
1187 | #endif /* CONFIG_SERIAL_BFIN_CONSOLE */ |
1188 | ||
57afb399 SZ |
1189 | #ifdef CONFIG_EARLY_PRINTK |
1190 | static struct bfin_serial_port bfin_earlyprintk_port; | |
1191 | #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk" | |
0ae53640 | 1192 | |
57afb399 SZ |
1193 | /* |
1194 | * Interrupts are disabled on entering | |
1195 | */ | |
1196 | static void | |
1197 | bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count) | |
0ae53640 | 1198 | { |
57afb399 | 1199 | unsigned long flags; |
0ae53640 | 1200 | |
57afb399 SZ |
1201 | if (bfin_earlyprintk_port.port.line != co->index) |
1202 | return; | |
0ae53640 | 1203 | |
57afb399 SZ |
1204 | spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags); |
1205 | uart_console_write(&bfin_earlyprintk_port.port, s, count, | |
1206 | bfin_serial_console_putchar); | |
1207 | spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags); | |
0ae53640 RG |
1208 | } |
1209 | ||
7de7c55b RG |
1210 | /* |
1211 | * This should have a .setup or .early_setup in it, but then things get called | |
1212 | * without the command line options, and the baud rate gets messed up - so | |
1213 | * don't let the common infrastructure play with things. (see calls to setup | |
1214 | * & earlysetup in ./kernel/printk.c:register_console() | |
1215 | */ | |
c1113400 | 1216 | static struct __initdata console bfin_early_serial_console = { |
0ae53640 | 1217 | .name = "early_BFuart", |
57afb399 | 1218 | .write = bfin_earlyprintk_console_write, |
0ae53640 RG |
1219 | .device = uart_console_device, |
1220 | .flags = CON_PRINTBUFFER, | |
0ae53640 RG |
1221 | .index = -1, |
1222 | .data = &bfin_serial_reg, | |
1223 | }; | |
6d9e4498 SZ |
1224 | #endif |
1225 | ||
194de561 BW |
1226 | static struct uart_driver bfin_serial_reg = { |
1227 | .owner = THIS_MODULE, | |
57afb399 SZ |
1228 | .driver_name = DRIVER_NAME, |
1229 | .dev_name = BFIN_SERIAL_DEV_NAME, | |
194de561 BW |
1230 | .major = BFIN_SERIAL_MAJOR, |
1231 | .minor = BFIN_SERIAL_MINOR, | |
2ade9729 | 1232 | .nr = BFIN_UART_NR_PORTS, |
194de561 BW |
1233 | .cons = BFIN_SERIAL_CONSOLE, |
1234 | }; | |
1235 | ||
57afb399 | 1236 | static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state) |
194de561 | 1237 | { |
57afb399 | 1238 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); |
194de561 | 1239 | |
57afb399 SZ |
1240 | return uart_suspend_port(&bfin_serial_reg, &uart->port); |
1241 | } | |
194de561 | 1242 | |
57afb399 SZ |
1243 | static int bfin_serial_resume(struct platform_device *pdev) |
1244 | { | |
1245 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); | |
1246 | ||
1247 | return uart_resume_port(&bfin_serial_reg, &uart->port); | |
194de561 BW |
1248 | } |
1249 | ||
57afb399 | 1250 | static int bfin_serial_probe(struct platform_device *pdev) |
194de561 | 1251 | { |
57afb399 SZ |
1252 | struct resource *res; |
1253 | struct bfin_serial_port *uart = NULL; | |
1254 | int ret = 0; | |
194de561 | 1255 | |
57afb399 SZ |
1256 | if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) { |
1257 | dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n"); | |
1258 | return -ENOENT; | |
ccfbc3e1 | 1259 | } |
194de561 | 1260 | |
57afb399 | 1261 | if (bfin_serial_ports[pdev->id] == NULL) { |
194de561 | 1262 | |
57afb399 SZ |
1263 | uart = kzalloc(sizeof(*uart), GFP_KERNEL); |
1264 | if (!uart) { | |
1265 | dev_err(&pdev->dev, | |
1266 | "fail to malloc bfin_serial_port\n"); | |
1267 | return -ENOMEM; | |
1268 | } | |
1269 | bfin_serial_ports[pdev->id] = uart; | |
194de561 | 1270 | |
57afb399 SZ |
1271 | #ifdef CONFIG_EARLY_PRINTK |
1272 | if (!(bfin_earlyprintk_port.port.membase | |
1273 | && bfin_earlyprintk_port.port.line == pdev->id)) { | |
1274 | /* | |
1275 | * If the peripheral PINs of current port is allocated | |
1276 | * in earlyprintk probe stage, don't do it again. | |
1277 | */ | |
1278 | #endif | |
1279 | ret = peripheral_request_list( | |
1280 | (unsigned short *)pdev->dev.platform_data, DRIVER_NAME); | |
1281 | if (ret) { | |
1282 | dev_err(&pdev->dev, | |
1283 | "fail to request bfin serial peripherals\n"); | |
1284 | goto out_error_free_mem; | |
1285 | } | |
1286 | #ifdef CONFIG_EARLY_PRINTK | |
1287 | } | |
1288 | #endif | |
1289 | ||
1290 | spin_lock_init(&uart->port.lock); | |
1291 | uart->port.uartclk = get_sclk(); | |
1292 | uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE; | |
1293 | uart->port.ops = &bfin_serial_pops; | |
1294 | uart->port.line = pdev->id; | |
1295 | uart->port.iotype = UPIO_MEM; | |
1296 | uart->port.flags = UPF_BOOT_AUTOCONF; | |
1297 | ||
1298 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1299 | if (res == NULL) { | |
1300 | dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); | |
1301 | ret = -ENOENT; | |
1302 | goto out_error_free_peripherals; | |
1303 | } | |
1304 | ||
28f65c11 | 1305 | uart->port.membase = ioremap(res->start, resource_size(res)); |
57afb399 SZ |
1306 | if (!uart->port.membase) { |
1307 | dev_err(&pdev->dev, "Cannot map uart IO\n"); | |
1308 | ret = -ENXIO; | |
1309 | goto out_error_free_peripherals; | |
1310 | } | |
1311 | uart->port.mapbase = res->start; | |
194de561 | 1312 | |
47918f05 SZ |
1313 | uart->tx_irq = platform_get_irq(pdev, 0); |
1314 | if (uart->tx_irq < 0) { | |
1315 | dev_err(&pdev->dev, "No uart TX IRQ specified\n"); | |
57afb399 SZ |
1316 | ret = -ENOENT; |
1317 | goto out_error_unmap; | |
194de561 | 1318 | } |
57afb399 | 1319 | |
47918f05 SZ |
1320 | uart->rx_irq = platform_get_irq(pdev, 1); |
1321 | if (uart->rx_irq < 0) { | |
1322 | dev_err(&pdev->dev, "No uart RX IRQ specified\n"); | |
1323 | ret = -ENOENT; | |
1324 | goto out_error_unmap; | |
1325 | } | |
1326 | uart->port.irq = uart->rx_irq; | |
1327 | ||
1328 | uart->status_irq = platform_get_irq(pdev, 2); | |
57afb399 SZ |
1329 | if (uart->status_irq < 0) { |
1330 | dev_err(&pdev->dev, "No uart status IRQ specified\n"); | |
1331 | ret = -ENOENT; | |
1332 | goto out_error_unmap; | |
1333 | } | |
1334 | ||
1335 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
0f66e50a | 1336 | spin_lock_init(&uart->rx_lock); |
57afb399 SZ |
1337 | uart->tx_done = 1; |
1338 | uart->tx_count = 0; | |
1339 | ||
1340 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
1341 | if (res == NULL) { | |
1342 | dev_err(&pdev->dev, "No uart TX DMA channel specified\n"); | |
1343 | ret = -ENOENT; | |
1344 | goto out_error_unmap; | |
1345 | } | |
1346 | uart->tx_dma_channel = res->start; | |
1347 | ||
1348 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
1349 | if (res == NULL) { | |
1350 | dev_err(&pdev->dev, "No uart RX DMA channel specified\n"); | |
1351 | ret = -ENOENT; | |
1352 | goto out_error_unmap; | |
1353 | } | |
1354 | uart->rx_dma_channel = res->start; | |
1355 | ||
1356 | init_timer(&(uart->rx_dma_timer)); | |
1357 | #endif | |
1358 | ||
1359 | #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \ | |
1360 | defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS) | |
1361 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
1362 | if (res == NULL) | |
1363 | uart->cts_pin = -1; | |
ee948e37 | 1364 | else { |
57afb399 | 1365 | uart->cts_pin = res->start; |
64851636 | 1366 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
ee948e37 | 1367 | uart->port.flags |= ASYNC_CTS_FLOW; |
64851636 | 1368 | #endif |
ee948e37 | 1369 | } |
57afb399 SZ |
1370 | |
1371 | res = platform_get_resource(pdev, IORESOURCE_IO, 1); | |
1372 | if (res == NULL) | |
1373 | uart->rts_pin = -1; | |
1374 | else | |
1375 | uart->rts_pin = res->start; | |
57afb399 | 1376 | #endif |
194de561 BW |
1377 | } |
1378 | ||
57afb399 SZ |
1379 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE |
1380 | if (!is_early_platform_device(pdev)) { | |
1381 | #endif | |
1382 | uart = bfin_serial_ports[pdev->id]; | |
1383 | uart->port.dev = &pdev->dev; | |
1384 | dev_set_drvdata(&pdev->dev, uart); | |
1385 | ret = uart_add_one_port(&bfin_serial_reg, &uart->port); | |
1386 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
1387 | } | |
1388 | #endif | |
1389 | ||
1390 | if (!ret) | |
1391 | return 0; | |
1392 | ||
1393 | if (uart) { | |
1394 | out_error_unmap: | |
1395 | iounmap(uart->port.membase); | |
1396 | out_error_free_peripherals: | |
1397 | peripheral_free_list( | |
1398 | (unsigned short *)pdev->dev.platform_data); | |
1399 | out_error_free_mem: | |
1400 | kfree(uart); | |
1401 | bfin_serial_ports[pdev->id] = NULL; | |
1402 | } | |
1403 | ||
1404 | return ret; | |
194de561 BW |
1405 | } |
1406 | ||
57afb399 | 1407 | static int __devexit bfin_serial_remove(struct platform_device *pdev) |
194de561 | 1408 | { |
57afb399 SZ |
1409 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); |
1410 | ||
1411 | dev_set_drvdata(&pdev->dev, NULL); | |
1412 | ||
1413 | if (uart) { | |
1414 | uart_remove_one_port(&bfin_serial_reg, &uart->port); | |
57afb399 SZ |
1415 | iounmap(uart->port.membase); |
1416 | peripheral_free_list( | |
1417 | (unsigned short *)pdev->dev.platform_data); | |
1418 | kfree(uart); | |
1419 | bfin_serial_ports[pdev->id] = NULL; | |
ccfbc3e1 | 1420 | } |
194de561 BW |
1421 | |
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | static struct platform_driver bfin_serial_driver = { | |
1426 | .probe = bfin_serial_probe, | |
57afb399 | 1427 | .remove = __devexit_p(bfin_serial_remove), |
194de561 BW |
1428 | .suspend = bfin_serial_suspend, |
1429 | .resume = bfin_serial_resume, | |
1430 | .driver = { | |
57afb399 | 1431 | .name = DRIVER_NAME, |
e169c139 | 1432 | .owner = THIS_MODULE, |
194de561 BW |
1433 | }, |
1434 | }; | |
1435 | ||
57afb399 SZ |
1436 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) |
1437 | static __initdata struct early_platform_driver early_bfin_serial_driver = { | |
1438 | .class_str = CLASS_BFIN_CONSOLE, | |
1439 | .pdrv = &bfin_serial_driver, | |
1440 | .requested_id = EARLY_PLATFORM_ID_UNSET, | |
1441 | }; | |
1442 | ||
1443 | static int __init bfin_serial_rs_console_init(void) | |
1444 | { | |
1445 | early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME); | |
1446 | ||
1447 | early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0); | |
1448 | ||
1449 | register_console(&bfin_serial_console); | |
1450 | ||
1451 | return 0; | |
1452 | } | |
1453 | console_initcall(bfin_serial_rs_console_init); | |
1454 | #endif | |
1455 | ||
1456 | #ifdef CONFIG_EARLY_PRINTK | |
1457 | /* | |
1458 | * Memory can't be allocated dynamically during earlyprink init stage. | |
1459 | * So, do individual probe for earlyprink with a static uart port variable. | |
1460 | */ | |
1461 | static int bfin_earlyprintk_probe(struct platform_device *pdev) | |
194de561 | 1462 | { |
57afb399 | 1463 | struct resource *res; |
194de561 BW |
1464 | int ret; |
1465 | ||
57afb399 SZ |
1466 | if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) { |
1467 | dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n"); | |
1468 | return -ENOENT; | |
1469 | } | |
1470 | ||
1471 | ret = peripheral_request_list( | |
1472 | (unsigned short *)pdev->dev.platform_data, DRIVER_NAME); | |
1473 | if (ret) { | |
1474 | dev_err(&pdev->dev, | |
1475 | "fail to request bfin serial peripherals\n"); | |
1476 | return ret; | |
1477 | } | |
1478 | ||
1479 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1480 | if (res == NULL) { | |
1481 | dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); | |
1482 | ret = -ENOENT; | |
1483 | goto out_error_free_peripherals; | |
1484 | } | |
1485 | ||
1486 | bfin_earlyprintk_port.port.membase = ioremap(res->start, | |
28f65c11 | 1487 | resource_size(res)); |
57afb399 SZ |
1488 | if (!bfin_earlyprintk_port.port.membase) { |
1489 | dev_err(&pdev->dev, "Cannot map uart IO\n"); | |
1490 | ret = -ENXIO; | |
1491 | goto out_error_free_peripherals; | |
1492 | } | |
1493 | bfin_earlyprintk_port.port.mapbase = res->start; | |
1494 | bfin_earlyprintk_port.port.line = pdev->id; | |
1495 | bfin_earlyprintk_port.port.uartclk = get_sclk(); | |
1496 | bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE; | |
1497 | spin_lock_init(&bfin_earlyprintk_port.port.lock); | |
1498 | ||
1499 | return 0; | |
1500 | ||
1501 | out_error_free_peripherals: | |
1502 | peripheral_free_list( | |
1503 | (unsigned short *)pdev->dev.platform_data); | |
1504 | ||
1505 | return ret; | |
1506 | } | |
1507 | ||
1508 | static struct platform_driver bfin_earlyprintk_driver = { | |
1509 | .probe = bfin_earlyprintk_probe, | |
1510 | .driver = { | |
1511 | .name = DRIVER_NAME, | |
1512 | .owner = THIS_MODULE, | |
1513 | }, | |
1514 | }; | |
1515 | ||
1516 | static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = { | |
1517 | .class_str = CLASS_BFIN_EARLYPRINTK, | |
1518 | .pdrv = &bfin_earlyprintk_driver, | |
1519 | .requested_id = EARLY_PLATFORM_ID_UNSET, | |
1520 | }; | |
1521 | ||
1522 | struct console __init *bfin_earlyserial_init(unsigned int port, | |
1523 | unsigned int cflag) | |
1524 | { | |
1525 | struct ktermios t; | |
1526 | char port_name[20]; | |
194de561 | 1527 | |
57afb399 SZ |
1528 | if (port < 0 || port >= BFIN_UART_NR_PORTS) |
1529 | return NULL; | |
1530 | ||
1531 | /* | |
1532 | * Only probe resource of the given port in earlyprintk boot arg. | |
1533 | * The expected port id should be indicated in port name string. | |
1534 | */ | |
1535 | snprintf(port_name, 20, DRIVER_NAME ".%d", port); | |
1536 | early_platform_driver_register(&early_bfin_earlyprintk_driver, | |
1537 | port_name); | |
1538 | early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0); | |
1539 | ||
1540 | if (!bfin_earlyprintk_port.port.membase) | |
1541 | return NULL; | |
1542 | ||
1543 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
1544 | /* | |
1545 | * If we are using early serial, don't let the normal console rewind | |
1546 | * log buffer, since that causes things to be printed multiple times | |
1547 | */ | |
1548 | bfin_serial_console.flags &= ~CON_PRINTBUFFER; | |
1549 | #endif | |
1550 | ||
1551 | bfin_early_serial_console.index = port; | |
1552 | t.c_cflag = cflag; | |
1553 | t.c_iflag = 0; | |
1554 | t.c_oflag = 0; | |
1555 | t.c_lflag = ICANON; | |
1556 | t.c_line = port; | |
1557 | bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t); | |
1558 | ||
1559 | return &bfin_early_serial_console; | |
1560 | } | |
1561 | #endif /* CONFIG_EARLY_PRINTK */ | |
1562 | ||
1563 | static int __init bfin_serial_init(void) | |
1564 | { | |
1565 | int ret; | |
1566 | ||
1567 | pr_info("Blackfin serial driver\n"); | |
194de561 BW |
1568 | |
1569 | ret = uart_register_driver(&bfin_serial_reg); | |
57afb399 SZ |
1570 | if (ret) { |
1571 | pr_err("failed to register %s:%d\n", | |
1572 | bfin_serial_reg.driver_name, ret); | |
1573 | } | |
1574 | ||
1575 | ret = platform_driver_register(&bfin_serial_driver); | |
1576 | if (ret) { | |
1577 | pr_err("fail to register bfin uart\n"); | |
1578 | uart_unregister_driver(&bfin_serial_reg); | |
194de561 | 1579 | } |
57afb399 | 1580 | |
194de561 BW |
1581 | return ret; |
1582 | } | |
1583 | ||
1584 | static void __exit bfin_serial_exit(void) | |
1585 | { | |
1586 | platform_driver_unregister(&bfin_serial_driver); | |
1587 | uart_unregister_driver(&bfin_serial_reg); | |
1588 | } | |
1589 | ||
52e15f0e | 1590 | |
194de561 BW |
1591 | module_init(bfin_serial_init); |
1592 | module_exit(bfin_serial_exit); | |
1593 | ||
57afb399 | 1594 | MODULE_AUTHOR("Sonic Zhang, Aubrey Li"); |
194de561 BW |
1595 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); |
1596 | MODULE_LICENSE("GPL"); | |
1597 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); | |
e169c139 | 1598 | MODULE_ALIAS("platform:bfin-uart"); |