diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-26 09:11:09 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-26 09:11:09 -0400 |
commit | efb8d21b2c6db3497655cc6a033ae8a9883e4063 (patch) | |
tree | a14a0dbb9fec3a6db5e542ba7ed4a49681706420 /drivers/tty/serial/bfin_uart.c | |
parent | 3cb603284b3d256ae9ae9e65887cee8416bfef15 (diff) | |
parent | d208a3bf77f902283894f546b6b5383202cf7882 (diff) |
Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
* 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (79 commits)
TTY: serial_core: Fix crash if DCD drop during suspend
tty/serial: atmel_serial: bootconsole removed from auto-enumerates
Revert "TTY: call tty_driver_lookup_tty unconditionally"
tty/serial: atmel_serial: add device tree support
tty/serial: atmel_serial: auto-enumerate ports
tty/serial: atmel_serial: whitespace and braces modifications
tty/serial: atmel_serial: change platform_data variable name
tty/serial: RS485 bindings for device tree
TTY: call tty_driver_lookup_tty unconditionally
TTY: pty, release tty in all ptmx_open fail paths
TTY: make tty_add_file non-failing
TTY: drop driver reference in tty_open fail path
8250_pci: Fix kernel panic when pch_uart is disabled
h8300: drivers/serial/Kconfig was moved
parport_pc: release IO region properly if unsupported ITE887x card is found
tty: Support compat_ioctl get/set termios_locked
hvc_console: display printk messages on console.
TTY: snyclinkmp: forever loop in tx_load_dma_buffer()
tty/n_gsm: avoid fifo overflow in gsm_dlci_data_output
tty/n_gsm: fix a bug in gsm_dlci_data_output (adaption = 2 case)
...
Fix up Conflicts in:
- drivers/tty/serial/8250_pci.c
Trivial conflict with removed duplicate device ID
- drivers/tty/serial/atmel_serial.c
Annoying silly conflict between "specify the port num via
platform_data" and other changes to atmel_console_init
Diffstat (limited to 'drivers/tty/serial/bfin_uart.c')
-rw-r--r-- | drivers/tty/serial/bfin_uart.c | 1611 |
1 files changed, 1611 insertions, 0 deletions
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c new file mode 100644 index 000000000000..66afb98b77b5 --- /dev/null +++ b/drivers/tty/serial/bfin_uart.c | |||
@@ -0,0 +1,1611 @@ | |||
1 | /* | ||
2 | * Blackfin On-Chip Serial Driver | ||
3 | * | ||
4 | * Copyright 2006-2010 Analog Devices Inc. | ||
5 | * | ||
6 | * Enter bugs at http://blackfin.uclinux.org/ | ||
7 | * | ||
8 | * Licensed under the GPL-2 or later. | ||
9 | */ | ||
10 | |||
11 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | ||
12 | #define SUPPORT_SYSRQ | ||
13 | #endif | ||
14 | |||
15 | #define DRIVER_NAME "bfin-uart" | ||
16 | #define pr_fmt(fmt) DRIVER_NAME ": " fmt | ||
17 | |||
18 | #include <linux/module.h> | ||
19 | #include <linux/ioport.h> | ||
20 | #include <linux/gfp.h> | ||
21 | #include <linux/io.h> | ||
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> | ||
29 | #include <linux/gpio.h> | ||
30 | #include <linux/irq.h> | ||
31 | #include <linux/kgdb.h> | ||
32 | #include <linux/slab.h> | ||
33 | #include <linux/dma-mapping.h> | ||
34 | |||
35 | #include <asm/portmux.h> | ||
36 | #include <asm/cacheflush.h> | ||
37 | #include <asm/dma.h> | ||
38 | |||
39 | #define port_membase(uart) (((struct bfin_serial_port *)(uart))->port.membase) | ||
40 | #define get_lsr_cache(uart) (((struct bfin_serial_port *)(uart))->lsr) | ||
41 | #define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v)) | ||
42 | #include <asm/bfin_serial.h> | ||
43 | |||
44 | #ifdef CONFIG_SERIAL_BFIN_MODULE | ||
45 | # undef CONFIG_EARLY_PRINTK | ||
46 | #endif | ||
47 | |||
48 | #ifdef CONFIG_SERIAL_BFIN_MODULE | ||
49 | # undef CONFIG_EARLY_PRINTK | ||
50 | #endif | ||
51 | |||
52 | /* UART name and device definitions */ | ||
53 | #define BFIN_SERIAL_DEV_NAME "ttyBF" | ||
54 | #define BFIN_SERIAL_MAJOR 204 | ||
55 | #define BFIN_SERIAL_MINOR 64 | ||
56 | |||
57 | static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS]; | ||
58 | |||
59 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ | ||
60 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | ||
61 | |||
62 | # ifndef CONFIG_SERIAL_BFIN_PIO | ||
63 | # error KGDB only support UART in PIO mode. | ||
64 | # endif | ||
65 | |||
66 | static int kgdboc_port_line; | ||
67 | static int kgdboc_break_enabled; | ||
68 | #endif | ||
69 | /* | ||
70 | * Setup for console. Argument comes from the menuconfig | ||
71 | */ | ||
72 | #define DMA_RX_XCOUNT 512 | ||
73 | #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT) | ||
74 | |||
75 | #define DMA_RX_FLUSH_JIFFIES (HZ / 50) | ||
76 | |||
77 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
78 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); | ||
79 | #else | ||
80 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart); | ||
81 | #endif | ||
82 | |||
83 | static void bfin_serial_reset_irda(struct uart_port *port); | ||
84 | |||
85 | #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \ | ||
86 | defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS) | ||
87 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) | ||
88 | { | ||
89 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
90 | if (uart->cts_pin < 0) | ||
91 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | ||
92 | |||
93 | /* CTS PIN is negative assertive. */ | ||
94 | if (UART_GET_CTS(uart)) | ||
95 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | ||
96 | else | ||
97 | return TIOCM_DSR | TIOCM_CAR; | ||
98 | } | ||
99 | |||
100 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | ||
101 | { | ||
102 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
103 | if (uart->rts_pin < 0) | ||
104 | return; | ||
105 | |||
106 | /* RTS PIN is negative assertive. */ | ||
107 | if (mctrl & TIOCM_RTS) | ||
108 | UART_ENABLE_RTS(uart); | ||
109 | else | ||
110 | UART_DISABLE_RTS(uart); | ||
111 | } | ||
112 | |||
113 | /* | ||
114 | * Handle any change of modem status signal. | ||
115 | */ | ||
116 | static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id) | ||
117 | { | ||
118 | struct bfin_serial_port *uart = dev_id; | ||
119 | unsigned int status; | ||
120 | |||
121 | status = bfin_serial_get_mctrl(&uart->port); | ||
122 | uart_handle_cts_change(&uart->port, status & TIOCM_CTS); | ||
123 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS | ||
124 | uart->scts = 1; | ||
125 | UART_CLEAR_SCTS(uart); | ||
126 | UART_CLEAR_IER(uart, EDSSI); | ||
127 | #endif | ||
128 | |||
129 | return IRQ_HANDLED; | ||
130 | } | ||
131 | #else | ||
132 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) | ||
133 | { | ||
134 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | ||
135 | } | ||
136 | |||
137 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | ||
138 | { | ||
139 | } | ||
140 | #endif | ||
141 | |||
142 | /* | ||
143 | * interrupts are disabled on entry | ||
144 | */ | ||
145 | static void bfin_serial_stop_tx(struct uart_port *port) | ||
146 | { | ||
147 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
148 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
149 | struct circ_buf *xmit = &uart->port.state->xmit; | ||
150 | #endif | ||
151 | |||
152 | while (!(UART_GET_LSR(uart) & TEMT)) | ||
153 | cpu_relax(); | ||
154 | |||
155 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
156 | disable_dma(uart->tx_dma_channel); | ||
157 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); | ||
158 | uart->port.icount.tx += uart->tx_count; | ||
159 | uart->tx_count = 0; | ||
160 | uart->tx_done = 1; | ||
161 | #else | ||
162 | #ifdef CONFIG_BF54x | ||
163 | /* Clear TFI bit */ | ||
164 | UART_PUT_LSR(uart, TFI); | ||
165 | #endif | ||
166 | UART_CLEAR_IER(uart, ETBEI); | ||
167 | #endif | ||
168 | } | ||
169 | |||
170 | /* | ||
171 | * port is locked and interrupts are disabled | ||
172 | */ | ||
173 | static void bfin_serial_start_tx(struct uart_port *port) | ||
174 | { | ||
175 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
176 | struct tty_struct *tty = uart->port.state->port.tty; | ||
177 | |||
178 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS | ||
179 | if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) { | ||
180 | uart->scts = 0; | ||
181 | uart_handle_cts_change(&uart->port, uart->scts); | ||
182 | } | ||
183 | #endif | ||
184 | |||
185 | /* | ||
186 | * To avoid losting RX interrupt, we reset IR function | ||
187 | * before sending data. | ||
188 | */ | ||
189 | if (tty->termios->c_line == N_IRDA) | ||
190 | bfin_serial_reset_irda(port); | ||
191 | |||
192 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
193 | if (uart->tx_done) | ||
194 | bfin_serial_dma_tx_chars(uart); | ||
195 | #else | ||
196 | UART_SET_IER(uart, ETBEI); | ||
197 | bfin_serial_tx_chars(uart); | ||
198 | #endif | ||
199 | } | ||
200 | |||
201 | /* | ||
202 | * Interrupts are enabled | ||
203 | */ | ||
204 | static void bfin_serial_stop_rx(struct uart_port *port) | ||
205 | { | ||
206 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
207 | |||
208 | UART_CLEAR_IER(uart, ERBFI); | ||
209 | } | ||
210 | |||
211 | /* | ||
212 | * Set the modem control timer to fire immediately. | ||
213 | */ | ||
214 | static void bfin_serial_enable_ms(struct uart_port *port) | ||
215 | { | ||
216 | } | ||
217 | |||
218 | |||
219 | #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO) | ||
220 | # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold) | ||
221 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v)) | ||
222 | #else | ||
223 | # define UART_GET_ANOMALY_THRESHOLD(uart) 0 | ||
224 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) | ||
225 | #endif | ||
226 | |||
227 | #ifdef CONFIG_SERIAL_BFIN_PIO | ||
228 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) | ||
229 | { | ||
230 | struct tty_struct *tty = NULL; | ||
231 | unsigned int status, ch, flg; | ||
232 | static struct timeval anomaly_start = { .tv_sec = 0 }; | ||
233 | |||
234 | status = UART_GET_LSR(uart); | ||
235 | UART_CLEAR_LSR(uart); | ||
236 | |||
237 | ch = UART_GET_CHAR(uart); | ||
238 | uart->port.icount.rx++; | ||
239 | |||
240 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ | ||
241 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | ||
242 | if (kgdb_connected && kgdboc_port_line == uart->port.line | ||
243 | && kgdboc_break_enabled) | ||
244 | if (ch == 0x3) {/* Ctrl + C */ | ||
245 | kgdb_breakpoint(); | ||
246 | return; | ||
247 | } | ||
248 | |||
249 | if (!uart->port.state || !uart->port.state->port.tty) | ||
250 | return; | ||
251 | #endif | ||
252 | tty = uart->port.state->port.tty; | ||
253 | |||
254 | if (ANOMALY_05000363) { | ||
255 | /* The BF533 (and BF561) family of processors have a nice anomaly | ||
256 | * where they continuously generate characters for a "single" break. | ||
257 | * We have to basically ignore this flood until the "next" valid | ||
258 | * character comes across. Due to the nature of the flood, it is | ||
259 | * not possible to reliably catch bytes that are sent too quickly | ||
260 | * after this break. So application code talking to the Blackfin | ||
261 | * which sends a break signal must allow at least 1.5 character | ||
262 | * times after the end of the break for things to stabilize. This | ||
263 | * timeout was picked as it must absolutely be larger than 1 | ||
264 | * character time +/- some percent. So 1.5 sounds good. All other | ||
265 | * Blackfin families operate properly. Woo. | ||
266 | */ | ||
267 | if (anomaly_start.tv_sec) { | ||
268 | struct timeval curr; | ||
269 | suseconds_t usecs; | ||
270 | |||
271 | if ((~ch & (~ch + 1)) & 0xff) | ||
272 | goto known_good_char; | ||
273 | |||
274 | do_gettimeofday(&curr); | ||
275 | if (curr.tv_sec - anomaly_start.tv_sec > 1) | ||
276 | goto known_good_char; | ||
277 | |||
278 | usecs = 0; | ||
279 | if (curr.tv_sec != anomaly_start.tv_sec) | ||
280 | usecs += USEC_PER_SEC; | ||
281 | usecs += curr.tv_usec - anomaly_start.tv_usec; | ||
282 | |||
283 | if (usecs > UART_GET_ANOMALY_THRESHOLD(uart)) | ||
284 | goto known_good_char; | ||
285 | |||
286 | if (ch) | ||
287 | anomaly_start.tv_sec = 0; | ||
288 | else | ||
289 | anomaly_start = curr; | ||
290 | |||
291 | return; | ||
292 | |||
293 | known_good_char: | ||
294 | status &= ~BI; | ||
295 | anomaly_start.tv_sec = 0; | ||
296 | } | ||
297 | } | ||
298 | |||
299 | if (status & BI) { | ||
300 | if (ANOMALY_05000363) | ||
301 | if (bfin_revid() < 5) | ||
302 | do_gettimeofday(&anomaly_start); | ||
303 | uart->port.icount.brk++; | ||
304 | if (uart_handle_break(&uart->port)) | ||
305 | goto ignore_char; | ||
306 | status &= ~(PE | FE); | ||
307 | } | ||
308 | if (status & PE) | ||
309 | uart->port.icount.parity++; | ||
310 | if (status & OE) | ||
311 | uart->port.icount.overrun++; | ||
312 | if (status & FE) | ||
313 | uart->port.icount.frame++; | ||
314 | |||
315 | status &= uart->port.read_status_mask; | ||
316 | |||
317 | if (status & BI) | ||
318 | flg = TTY_BREAK; | ||
319 | else if (status & PE) | ||
320 | flg = TTY_PARITY; | ||
321 | else if (status & FE) | ||
322 | flg = TTY_FRAME; | ||
323 | else | ||
324 | flg = TTY_NORMAL; | ||
325 | |||
326 | if (uart_handle_sysrq_char(&uart->port, ch)) | ||
327 | goto ignore_char; | ||
328 | |||
329 | uart_insert_char(&uart->port, status, OE, ch, flg); | ||
330 | |||
331 | ignore_char: | ||
332 | tty_flip_buffer_push(tty); | ||
333 | } | ||
334 | |||
335 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) | ||
336 | { | ||
337 | struct circ_buf *xmit = &uart->port.state->xmit; | ||
338 | |||
339 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { | ||
340 | #ifdef CONFIG_BF54x | ||
341 | /* Clear TFI bit */ | ||
342 | UART_PUT_LSR(uart, TFI); | ||
343 | #endif | ||
344 | /* Anomaly notes: | ||
345 | * 05000215 - we always clear ETBEI within last UART TX | ||
346 | * interrupt to end a string. It is always set | ||
347 | * when start a new tx. | ||
348 | */ | ||
349 | UART_CLEAR_IER(uart, ETBEI); | ||
350 | return; | ||
351 | } | ||
352 | |||
353 | if (uart->port.x_char) { | ||
354 | UART_PUT_CHAR(uart, uart->port.x_char); | ||
355 | uart->port.icount.tx++; | ||
356 | uart->port.x_char = 0; | ||
357 | } | ||
358 | |||
359 | while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) { | ||
360 | UART_PUT_CHAR(uart, xmit->buf[xmit->tail]); | ||
361 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | ||
362 | uart->port.icount.tx++; | ||
363 | } | ||
364 | |||
365 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | ||
366 | uart_write_wakeup(&uart->port); | ||
367 | } | ||
368 | |||
369 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) | ||
370 | { | ||
371 | struct bfin_serial_port *uart = dev_id; | ||
372 | |||
373 | while (UART_GET_LSR(uart) & DR) | ||
374 | bfin_serial_rx_chars(uart); | ||
375 | |||
376 | return IRQ_HANDLED; | ||
377 | } | ||
378 | |||
379 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) | ||
380 | { | ||
381 | struct bfin_serial_port *uart = dev_id; | ||
382 | |||
383 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS | ||
384 | if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) { | ||
385 | uart->scts = 0; | ||
386 | uart_handle_cts_change(&uart->port, uart->scts); | ||
387 | } | ||
388 | #endif | ||
389 | spin_lock(&uart->port.lock); | ||
390 | if (UART_GET_LSR(uart) & THRE) | ||
391 | bfin_serial_tx_chars(uart); | ||
392 | spin_unlock(&uart->port.lock); | ||
393 | |||
394 | return IRQ_HANDLED; | ||
395 | } | ||
396 | #endif | ||
397 | |||
398 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
399 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) | ||
400 | { | ||
401 | struct circ_buf *xmit = &uart->port.state->xmit; | ||
402 | |||
403 | uart->tx_done = 0; | ||
404 | |||
405 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { | ||
406 | uart->tx_count = 0; | ||
407 | uart->tx_done = 1; | ||
408 | return; | ||
409 | } | ||
410 | |||
411 | if (uart->port.x_char) { | ||
412 | UART_PUT_CHAR(uart, uart->port.x_char); | ||
413 | uart->port.icount.tx++; | ||
414 | uart->port.x_char = 0; | ||
415 | } | ||
416 | |||
417 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); | ||
418 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) | ||
419 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; | ||
420 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), | ||
421 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); | ||
422 | set_dma_config(uart->tx_dma_channel, | ||
423 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, | ||
424 | INTR_ON_BUF, | ||
425 | DIMENSION_LINEAR, | ||
426 | DATA_SIZE_8, | ||
427 | DMA_SYNC_RESTART)); | ||
428 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); | ||
429 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); | ||
430 | set_dma_x_modify(uart->tx_dma_channel, 1); | ||
431 | SSYNC(); | ||
432 | enable_dma(uart->tx_dma_channel); | ||
433 | |||
434 | UART_SET_IER(uart, ETBEI); | ||
435 | } | ||
436 | |||
437 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) | ||
438 | { | ||
439 | struct tty_struct *tty = uart->port.state->port.tty; | ||
440 | int i, flg, status; | ||
441 | |||
442 | status = UART_GET_LSR(uart); | ||
443 | UART_CLEAR_LSR(uart); | ||
444 | |||
445 | uart->port.icount.rx += | ||
446 | CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, | ||
447 | UART_XMIT_SIZE); | ||
448 | |||
449 | if (status & BI) { | ||
450 | uart->port.icount.brk++; | ||
451 | if (uart_handle_break(&uart->port)) | ||
452 | goto dma_ignore_char; | ||
453 | status &= ~(PE | FE); | ||
454 | } | ||
455 | if (status & PE) | ||
456 | uart->port.icount.parity++; | ||
457 | if (status & OE) | ||
458 | uart->port.icount.overrun++; | ||
459 | if (status & FE) | ||
460 | uart->port.icount.frame++; | ||
461 | |||
462 | status &= uart->port.read_status_mask; | ||
463 | |||
464 | if (status & BI) | ||
465 | flg = TTY_BREAK; | ||
466 | else if (status & PE) | ||
467 | flg = TTY_PARITY; | ||
468 | else if (status & FE) | ||
469 | flg = TTY_FRAME; | ||
470 | else | ||
471 | flg = TTY_NORMAL; | ||
472 | |||
473 | for (i = uart->rx_dma_buf.tail; ; i++) { | ||
474 | if (i >= UART_XMIT_SIZE) | ||
475 | i = 0; | ||
476 | if (i == uart->rx_dma_buf.head) | ||
477 | break; | ||
478 | if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) | ||
479 | uart_insert_char(&uart->port, status, OE, | ||
480 | uart->rx_dma_buf.buf[i], flg); | ||
481 | } | ||
482 | |||
483 | dma_ignore_char: | ||
484 | tty_flip_buffer_push(tty); | ||
485 | } | ||
486 | |||
487 | void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) | ||
488 | { | ||
489 | int x_pos, pos; | ||
490 | |||
491 | dma_disable_irq_nosync(uart->rx_dma_channel); | ||
492 | spin_lock_bh(&uart->rx_lock); | ||
493 | |||
494 | /* 2D DMA RX buffer ring is used. Because curr_y_count and | ||
495 | * curr_x_count can't be read as an atomic operation, | ||
496 | * curr_y_count should be read before curr_x_count. When | ||
497 | * curr_x_count is read, curr_y_count may already indicate | ||
498 | * next buffer line. But, the position calculated here is | ||
499 | * still indicate the old line. The wrong position data may | ||
500 | * be smaller than current buffer tail, which cause garbages | ||
501 | * are received if it is not prohibit. | ||
502 | */ | ||
503 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); | ||
504 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); | ||
505 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; | ||
506 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0) | ||
507 | uart->rx_dma_nrows = 0; | ||
508 | x_pos = DMA_RX_XCOUNT - x_pos; | ||
509 | if (x_pos == DMA_RX_XCOUNT) | ||
510 | x_pos = 0; | ||
511 | |||
512 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; | ||
513 | /* Ignore receiving data if new position is in the same line of | ||
514 | * current buffer tail and small. | ||
515 | */ | ||
516 | if (pos > uart->rx_dma_buf.tail || | ||
517 | uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) { | ||
518 | uart->rx_dma_buf.head = pos; | ||
519 | bfin_serial_dma_rx_chars(uart); | ||
520 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; | ||
521 | } | ||
522 | |||
523 | spin_unlock_bh(&uart->rx_lock); | ||
524 | dma_enable_irq(uart->rx_dma_channel); | ||
525 | |||
526 | mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES); | ||
527 | } | ||
528 | |||
529 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) | ||
530 | { | ||
531 | struct bfin_serial_port *uart = dev_id; | ||
532 | struct circ_buf *xmit = &uart->port.state->xmit; | ||
533 | |||
534 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS | ||
535 | if (uart->scts && !(bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) { | ||
536 | uart->scts = 0; | ||
537 | uart_handle_cts_change(&uart->port, uart->scts); | ||
538 | } | ||
539 | #endif | ||
540 | |||
541 | spin_lock(&uart->port.lock); | ||
542 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { | ||
543 | disable_dma(uart->tx_dma_channel); | ||
544 | clear_dma_irqstat(uart->tx_dma_channel); | ||
545 | /* Anomaly notes: | ||
546 | * 05000215 - we always clear ETBEI within last UART TX | ||
547 | * interrupt to end a string. It is always set | ||
548 | * when start a new tx. | ||
549 | */ | ||
550 | UART_CLEAR_IER(uart, ETBEI); | ||
551 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); | ||
552 | uart->port.icount.tx += uart->tx_count; | ||
553 | |||
554 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | ||
555 | uart_write_wakeup(&uart->port); | ||
556 | |||
557 | bfin_serial_dma_tx_chars(uart); | ||
558 | } | ||
559 | |||
560 | spin_unlock(&uart->port.lock); | ||
561 | return IRQ_HANDLED; | ||
562 | } | ||
563 | |||
564 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) | ||
565 | { | ||
566 | struct bfin_serial_port *uart = dev_id; | ||
567 | unsigned short irqstat; | ||
568 | int x_pos, pos; | ||
569 | |||
570 | spin_lock(&uart->rx_lock); | ||
571 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); | ||
572 | clear_dma_irqstat(uart->rx_dma_channel); | ||
573 | |||
574 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); | ||
575 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); | ||
576 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; | ||
577 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0) | ||
578 | uart->rx_dma_nrows = 0; | ||
579 | |||
580 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT; | ||
581 | if (pos > uart->rx_dma_buf.tail || | ||
582 | uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) { | ||
583 | uart->rx_dma_buf.head = pos; | ||
584 | bfin_serial_dma_rx_chars(uart); | ||
585 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; | ||
586 | } | ||
587 | |||
588 | spin_unlock(&uart->rx_lock); | ||
589 | |||
590 | return IRQ_HANDLED; | ||
591 | } | ||
592 | #endif | ||
593 | |||
594 | /* | ||
595 | * Return TIOCSER_TEMT when transmitter is not busy. | ||
596 | */ | ||
597 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) | ||
598 | { | ||
599 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
600 | unsigned short lsr; | ||
601 | |||
602 | lsr = UART_GET_LSR(uart); | ||
603 | if (lsr & TEMT) | ||
604 | return TIOCSER_TEMT; | ||
605 | else | ||
606 | return 0; | ||
607 | } | ||
608 | |||
609 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) | ||
610 | { | ||
611 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
612 | u16 lcr = UART_GET_LCR(uart); | ||
613 | if (break_state) | ||
614 | lcr |= SB; | ||
615 | else | ||
616 | lcr &= ~SB; | ||
617 | UART_PUT_LCR(uart, lcr); | ||
618 | SSYNC(); | ||
619 | } | ||
620 | |||
621 | static int bfin_serial_startup(struct uart_port *port) | ||
622 | { | ||
623 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
624 | |||
625 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
626 | dma_addr_t dma_handle; | ||
627 | |||
628 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { | ||
629 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); | ||
630 | return -EBUSY; | ||
631 | } | ||
632 | |||
633 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { | ||
634 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); | ||
635 | free_dma(uart->rx_dma_channel); | ||
636 | return -EBUSY; | ||
637 | } | ||
638 | |||
639 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); | ||
640 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); | ||
641 | |||
642 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); | ||
643 | uart->rx_dma_buf.head = 0; | ||
644 | uart->rx_dma_buf.tail = 0; | ||
645 | uart->rx_dma_nrows = 0; | ||
646 | |||
647 | set_dma_config(uart->rx_dma_channel, | ||
648 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, | ||
649 | INTR_ON_ROW, DIMENSION_2D, | ||
650 | DATA_SIZE_8, | ||
651 | DMA_SYNC_RESTART)); | ||
652 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); | ||
653 | set_dma_x_modify(uart->rx_dma_channel, 1); | ||
654 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); | ||
655 | set_dma_y_modify(uart->rx_dma_channel, 1); | ||
656 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); | ||
657 | enable_dma(uart->rx_dma_channel); | ||
658 | |||
659 | uart->rx_dma_timer.data = (unsigned long)(uart); | ||
660 | uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; | ||
661 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; | ||
662 | add_timer(&(uart->rx_dma_timer)); | ||
663 | #else | ||
664 | # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ | ||
665 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | ||
666 | if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled) | ||
667 | kgdboc_break_enabled = 0; | ||
668 | else { | ||
669 | # endif | ||
670 | if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0, | ||
671 | "BFIN_UART_RX", uart)) { | ||
672 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); | ||
673 | return -EBUSY; | ||
674 | } | ||
675 | |||
676 | if (request_irq | ||
677 | (uart->tx_irq, bfin_serial_tx_int, 0, | ||
678 | "BFIN_UART_TX", uart)) { | ||
679 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); | ||
680 | free_irq(uart->rx_irq, uart); | ||
681 | return -EBUSY; | ||
682 | } | ||
683 | |||
684 | # ifdef CONFIG_BF54x | ||
685 | { | ||
686 | /* | ||
687 | * UART2 and UART3 on BF548 share interrupt PINs and DMA | ||
688 | * controllers with SPORT2 and SPORT3. UART rx and tx | ||
689 | * interrupts are generated in PIO mode only when configure | ||
690 | * their peripheral mapping registers properly, which means | ||
691 | * request corresponding DMA channels in PIO mode as well. | ||
692 | */ | ||
693 | unsigned uart_dma_ch_rx, uart_dma_ch_tx; | ||
694 | |||
695 | switch (uart->rx_irq) { | ||
696 | case IRQ_UART3_RX: | ||
697 | uart_dma_ch_rx = CH_UART3_RX; | ||
698 | uart_dma_ch_tx = CH_UART3_TX; | ||
699 | break; | ||
700 | case IRQ_UART2_RX: | ||
701 | uart_dma_ch_rx = CH_UART2_RX; | ||
702 | uart_dma_ch_tx = CH_UART2_TX; | ||
703 | break; | ||
704 | default: | ||
705 | uart_dma_ch_rx = uart_dma_ch_tx = 0; | ||
706 | break; | ||
707 | }; | ||
708 | |||
709 | if (uart_dma_ch_rx && | ||
710 | request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) { | ||
711 | printk(KERN_NOTICE"Fail to attach UART interrupt\n"); | ||
712 | free_irq(uart->rx_irq, uart); | ||
713 | free_irq(uart->tx_irq, uart); | ||
714 | return -EBUSY; | ||
715 | } | ||
716 | if (uart_dma_ch_tx && | ||
717 | request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) { | ||
718 | printk(KERN_NOTICE "Fail to attach UART interrupt\n"); | ||
719 | free_dma(uart_dma_ch_rx); | ||
720 | free_irq(uart->rx_irq, uart); | ||
721 | free_irq(uart->tx_irq, uart); | ||
722 | return -EBUSY; | ||
723 | } | ||
724 | } | ||
725 | # endif | ||
726 | # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ | ||
727 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | ||
728 | } | ||
729 | # endif | ||
730 | #endif | ||
731 | |||
732 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | ||
733 | if (uart->cts_pin >= 0) { | ||
734 | if (request_irq(gpio_to_irq(uart->cts_pin), | ||
735 | bfin_serial_mctrl_cts_int, | ||
736 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | | ||
737 | 0, "BFIN_UART_CTS", uart)) { | ||
738 | uart->cts_pin = -1; | ||
739 | pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n"); | ||
740 | } | ||
741 | } | ||
742 | if (uart->rts_pin >= 0) | ||
743 | gpio_direction_output(uart->rts_pin, 0); | ||
744 | #endif | ||
745 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS | ||
746 | if (uart->cts_pin >= 0 && request_irq(uart->status_irq, | ||
747 | bfin_serial_mctrl_cts_int, | ||
748 | 0, "BFIN_UART_MODEM_STATUS", uart)) { | ||
749 | uart->cts_pin = -1; | ||
750 | pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n"); | ||
751 | } | ||
752 | |||
753 | /* CTS RTS PINs are negative assertive. */ | ||
754 | UART_PUT_MCR(uart, ACTS); | ||
755 | UART_SET_IER(uart, EDSSI); | ||
756 | #endif | ||
757 | |||
758 | UART_SET_IER(uart, ERBFI); | ||
759 | return 0; | ||
760 | } | ||
761 | |||
762 | static void bfin_serial_shutdown(struct uart_port *port) | ||
763 | { | ||
764 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
765 | |||
766 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
767 | disable_dma(uart->tx_dma_channel); | ||
768 | free_dma(uart->tx_dma_channel); | ||
769 | disable_dma(uart->rx_dma_channel); | ||
770 | free_dma(uart->rx_dma_channel); | ||
771 | del_timer(&(uart->rx_dma_timer)); | ||
772 | dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0); | ||
773 | #else | ||
774 | #ifdef CONFIG_BF54x | ||
775 | switch (uart->port.irq) { | ||
776 | case IRQ_UART3_RX: | ||
777 | free_dma(CH_UART3_RX); | ||
778 | free_dma(CH_UART3_TX); | ||
779 | break; | ||
780 | case IRQ_UART2_RX: | ||
781 | free_dma(CH_UART2_RX); | ||
782 | free_dma(CH_UART2_TX); | ||
783 | break; | ||
784 | default: | ||
785 | break; | ||
786 | }; | ||
787 | #endif | ||
788 | free_irq(uart->rx_irq, uart); | ||
789 | free_irq(uart->tx_irq, uart); | ||
790 | #endif | ||
791 | |||
792 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | ||
793 | if (uart->cts_pin >= 0) | ||
794 | free_irq(gpio_to_irq(uart->cts_pin), uart); | ||
795 | #endif | ||
796 | #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS | ||
797 | if (uart->cts_pin >= 0) | ||
798 | free_irq(uart->status_irq, uart); | ||
799 | #endif | ||
800 | } | ||
801 | |||
802 | static void | ||
803 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, | ||
804 | struct ktermios *old) | ||
805 | { | ||
806 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
807 | unsigned long flags; | ||
808 | unsigned int baud, quot; | ||
809 | unsigned short val, ier, lcr = 0; | ||
810 | |||
811 | switch (termios->c_cflag & CSIZE) { | ||
812 | case CS8: | ||
813 | lcr = WLS(8); | ||
814 | break; | ||
815 | case CS7: | ||
816 | lcr = WLS(7); | ||
817 | break; | ||
818 | case CS6: | ||
819 | lcr = WLS(6); | ||
820 | break; | ||
821 | case CS5: | ||
822 | lcr = WLS(5); | ||
823 | break; | ||
824 | default: | ||
825 | printk(KERN_ERR "%s: word lengh not supported\n", | ||
826 | __func__); | ||
827 | } | ||
828 | |||
829 | /* Anomaly notes: | ||
830 | * 05000231 - STOP bit is always set to 1 whatever the user is set. | ||
831 | */ | ||
832 | if (termios->c_cflag & CSTOPB) { | ||
833 | if (ANOMALY_05000231) | ||
834 | printk(KERN_WARNING "STOP bits other than 1 is not " | ||
835 | "supported in case of anomaly 05000231.\n"); | ||
836 | else | ||
837 | lcr |= STB; | ||
838 | } | ||
839 | if (termios->c_cflag & PARENB) | ||
840 | lcr |= PEN; | ||
841 | if (!(termios->c_cflag & PARODD)) | ||
842 | lcr |= EPS; | ||
843 | if (termios->c_cflag & CMSPAR) | ||
844 | lcr |= STP; | ||
845 | |||
846 | spin_lock_irqsave(&uart->port.lock, flags); | ||
847 | |||
848 | port->read_status_mask = OE; | ||
849 | if (termios->c_iflag & INPCK) | ||
850 | port->read_status_mask |= (FE | PE); | ||
851 | if (termios->c_iflag & (BRKINT | PARMRK)) | ||
852 | port->read_status_mask |= BI; | ||
853 | |||
854 | /* | ||
855 | * Characters to ignore | ||
856 | */ | ||
857 | port->ignore_status_mask = 0; | ||
858 | if (termios->c_iflag & IGNPAR) | ||
859 | port->ignore_status_mask |= FE | PE; | ||
860 | if (termios->c_iflag & IGNBRK) { | ||
861 | port->ignore_status_mask |= BI; | ||
862 | /* | ||
863 | * If we're ignoring parity and break indicators, | ||
864 | * ignore overruns too (for real raw support). | ||
865 | */ | ||
866 | if (termios->c_iflag & IGNPAR) | ||
867 | port->ignore_status_mask |= OE; | ||
868 | } | ||
869 | |||
870 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | ||
871 | quot = uart_get_divisor(port, baud); | ||
872 | |||
873 | /* If discipline is not IRDA, apply ANOMALY_05000230 */ | ||
874 | if (termios->c_line != N_IRDA) | ||
875 | quot -= ANOMALY_05000230; | ||
876 | |||
877 | UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15); | ||
878 | |||
879 | /* Disable UART */ | ||
880 | ier = UART_GET_IER(uart); | ||
881 | UART_DISABLE_INTS(uart); | ||
882 | |||
883 | /* Set DLAB in LCR to Access DLL and DLH */ | ||
884 | UART_SET_DLAB(uart); | ||
885 | |||
886 | UART_PUT_DLL(uart, quot & 0xFF); | ||
887 | UART_PUT_DLH(uart, (quot >> 8) & 0xFF); | ||
888 | SSYNC(); | ||
889 | |||
890 | /* Clear DLAB in LCR to Access THR RBR IER */ | ||
891 | UART_CLEAR_DLAB(uart); | ||
892 | |||
893 | UART_PUT_LCR(uart, lcr); | ||
894 | |||
895 | /* Enable UART */ | ||
896 | UART_ENABLE_INTS(uart, ier); | ||
897 | |||
898 | val = UART_GET_GCTL(uart); | ||
899 | val |= UCEN; | ||
900 | UART_PUT_GCTL(uart, val); | ||
901 | |||
902 | /* Port speed changed, update the per-port timeout. */ | ||
903 | uart_update_timeout(port, termios->c_cflag, baud); | ||
904 | |||
905 | spin_unlock_irqrestore(&uart->port.lock, flags); | ||
906 | } | ||
907 | |||
908 | static const char *bfin_serial_type(struct uart_port *port) | ||
909 | { | ||
910 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
911 | |||
912 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; | ||
913 | } | ||
914 | |||
915 | /* | ||
916 | * Release the memory region(s) being used by 'port'. | ||
917 | */ | ||
918 | static void bfin_serial_release_port(struct uart_port *port) | ||
919 | { | ||
920 | } | ||
921 | |||
922 | /* | ||
923 | * Request the memory region(s) being used by 'port'. | ||
924 | */ | ||
925 | static int bfin_serial_request_port(struct uart_port *port) | ||
926 | { | ||
927 | return 0; | ||
928 | } | ||
929 | |||
930 | /* | ||
931 | * Configure/autoconfigure the port. | ||
932 | */ | ||
933 | static void bfin_serial_config_port(struct uart_port *port, int flags) | ||
934 | { | ||
935 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
936 | |||
937 | if (flags & UART_CONFIG_TYPE && | ||
938 | bfin_serial_request_port(&uart->port) == 0) | ||
939 | uart->port.type = PORT_BFIN; | ||
940 | } | ||
941 | |||
942 | /* | ||
943 | * Verify the new serial_struct (for TIOCSSERIAL). | ||
944 | * The only change we allow are to the flags and type, and | ||
945 | * even then only between PORT_BFIN and PORT_UNKNOWN | ||
946 | */ | ||
947 | static int | ||
948 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | ||
949 | { | ||
950 | return 0; | ||
951 | } | ||
952 | |||
953 | /* | ||
954 | * Enable the IrDA function if tty->ldisc.num is N_IRDA. | ||
955 | * In other cases, disable IrDA function. | ||
956 | */ | ||
957 | static void bfin_serial_set_ldisc(struct uart_port *port, int ld) | ||
958 | { | ||
959 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
960 | unsigned short val; | ||
961 | |||
962 | switch (ld) { | ||
963 | case N_IRDA: | ||
964 | val = UART_GET_GCTL(uart); | ||
965 | val |= (IREN | RPOLC); | ||
966 | UART_PUT_GCTL(uart, val); | ||
967 | break; | ||
968 | default: | ||
969 | val = UART_GET_GCTL(uart); | ||
970 | val &= ~(IREN | RPOLC); | ||
971 | UART_PUT_GCTL(uart, val); | ||
972 | } | ||
973 | } | ||
974 | |||
975 | static void bfin_serial_reset_irda(struct uart_port *port) | ||
976 | { | ||
977 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
978 | unsigned short val; | ||
979 | |||
980 | val = UART_GET_GCTL(uart); | ||
981 | val &= ~(IREN | RPOLC); | ||
982 | UART_PUT_GCTL(uart, val); | ||
983 | SSYNC(); | ||
984 | val |= (IREN | RPOLC); | ||
985 | UART_PUT_GCTL(uart, val); | ||
986 | SSYNC(); | ||
987 | } | ||
988 | |||
989 | #ifdef CONFIG_CONSOLE_POLL | ||
990 | /* Anomaly notes: | ||
991 | * 05000099 - Because we only use THRE in poll_put and DR in poll_get, | ||
992 | * losing other bits of UART_LSR is not a problem here. | ||
993 | */ | ||
994 | static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr) | ||
995 | { | ||
996 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
997 | |||
998 | while (!(UART_GET_LSR(uart) & THRE)) | ||
999 | cpu_relax(); | ||
1000 | |||
1001 | UART_CLEAR_DLAB(uart); | ||
1002 | UART_PUT_CHAR(uart, (unsigned char)chr); | ||
1003 | } | ||
1004 | |||
1005 | static int bfin_serial_poll_get_char(struct uart_port *port) | ||
1006 | { | ||
1007 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
1008 | unsigned char chr; | ||
1009 | |||
1010 | while (!(UART_GET_LSR(uart) & DR)) | ||
1011 | cpu_relax(); | ||
1012 | |||
1013 | UART_CLEAR_DLAB(uart); | ||
1014 | chr = UART_GET_CHAR(uart); | ||
1015 | |||
1016 | return chr; | ||
1017 | } | ||
1018 | #endif | ||
1019 | |||
1020 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ | ||
1021 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | ||
1022 | static void bfin_kgdboc_port_shutdown(struct uart_port *port) | ||
1023 | { | ||
1024 | if (kgdboc_break_enabled) { | ||
1025 | kgdboc_break_enabled = 0; | ||
1026 | bfin_serial_shutdown(port); | ||
1027 | } | ||
1028 | } | ||
1029 | |||
1030 | static int bfin_kgdboc_port_startup(struct uart_port *port) | ||
1031 | { | ||
1032 | kgdboc_port_line = port->line; | ||
1033 | kgdboc_break_enabled = !bfin_serial_startup(port); | ||
1034 | return 0; | ||
1035 | } | ||
1036 | #endif | ||
1037 | |||
1038 | static struct uart_ops bfin_serial_pops = { | ||
1039 | .tx_empty = bfin_serial_tx_empty, | ||
1040 | .set_mctrl = bfin_serial_set_mctrl, | ||
1041 | .get_mctrl = bfin_serial_get_mctrl, | ||
1042 | .stop_tx = bfin_serial_stop_tx, | ||
1043 | .start_tx = bfin_serial_start_tx, | ||
1044 | .stop_rx = bfin_serial_stop_rx, | ||
1045 | .enable_ms = bfin_serial_enable_ms, | ||
1046 | .break_ctl = bfin_serial_break_ctl, | ||
1047 | .startup = bfin_serial_startup, | ||
1048 | .shutdown = bfin_serial_shutdown, | ||
1049 | .set_termios = bfin_serial_set_termios, | ||
1050 | .set_ldisc = bfin_serial_set_ldisc, | ||
1051 | .type = bfin_serial_type, | ||
1052 | .release_port = bfin_serial_release_port, | ||
1053 | .request_port = bfin_serial_request_port, | ||
1054 | .config_port = bfin_serial_config_port, | ||
1055 | .verify_port = bfin_serial_verify_port, | ||
1056 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ | ||
1057 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | ||
1058 | .kgdboc_port_startup = bfin_kgdboc_port_startup, | ||
1059 | .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown, | ||
1060 | #endif | ||
1061 | #ifdef CONFIG_CONSOLE_POLL | ||
1062 | .poll_put_char = bfin_serial_poll_put_char, | ||
1063 | .poll_get_char = bfin_serial_poll_get_char, | ||
1064 | #endif | ||
1065 | }; | ||
1066 | |||
1067 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK) | ||
1068 | /* | ||
1069 | * If the port was already initialised (eg, by a boot loader), | ||
1070 | * try to determine the current setup. | ||
1071 | */ | ||
1072 | static void __init | ||
1073 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, | ||
1074 | int *parity, int *bits) | ||
1075 | { | ||
1076 | unsigned short status; | ||
1077 | |||
1078 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); | ||
1079 | if (status == (ERBFI | ETBEI)) { | ||
1080 | /* ok, the port was enabled */ | ||
1081 | u16 lcr, dlh, dll; | ||
1082 | |||
1083 | lcr = UART_GET_LCR(uart); | ||
1084 | |||
1085 | *parity = 'n'; | ||
1086 | if (lcr & PEN) { | ||
1087 | if (lcr & EPS) | ||
1088 | *parity = 'e'; | ||
1089 | else | ||
1090 | *parity = 'o'; | ||
1091 | } | ||
1092 | switch (lcr & 0x03) { | ||
1093 | case 0: | ||
1094 | *bits = 5; | ||
1095 | break; | ||
1096 | case 1: | ||
1097 | *bits = 6; | ||
1098 | break; | ||
1099 | case 2: | ||
1100 | *bits = 7; | ||
1101 | break; | ||
1102 | case 3: | ||
1103 | *bits = 8; | ||
1104 | break; | ||
1105 | } | ||
1106 | /* Set DLAB in LCR to Access DLL and DLH */ | ||
1107 | UART_SET_DLAB(uart); | ||
1108 | |||
1109 | dll = UART_GET_DLL(uart); | ||
1110 | dlh = UART_GET_DLH(uart); | ||
1111 | |||
1112 | /* Clear DLAB in LCR to Access THR RBR IER */ | ||
1113 | UART_CLEAR_DLAB(uart); | ||
1114 | |||
1115 | *baud = get_sclk() / (16*(dll | dlh << 8)); | ||
1116 | } | ||
1117 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits); | ||
1118 | } | ||
1119 | |||
1120 | static struct uart_driver bfin_serial_reg; | ||
1121 | |||
1122 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) | ||
1123 | { | ||
1124 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | ||
1125 | while (!(UART_GET_LSR(uart) & THRE)) | ||
1126 | barrier(); | ||
1127 | UART_PUT_CHAR(uart, ch); | ||
1128 | } | ||
1129 | |||
1130 | #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) || | ||
1131 | defined (CONFIG_EARLY_PRINTK) */ | ||
1132 | |||
1133 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | ||
1134 | #define CLASS_BFIN_CONSOLE "bfin-console" | ||
1135 | /* | ||
1136 | * Interrupts are disabled on entering | ||
1137 | */ | ||
1138 | static void | ||
1139 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) | ||
1140 | { | ||
1141 | struct bfin_serial_port *uart = bfin_serial_ports[co->index]; | ||
1142 | unsigned long flags; | ||
1143 | |||
1144 | spin_lock_irqsave(&uart->port.lock, flags); | ||
1145 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); | ||
1146 | spin_unlock_irqrestore(&uart->port.lock, flags); | ||
1147 | |||
1148 | } | ||
1149 | |||
1150 | static int __init | ||
1151 | bfin_serial_console_setup(struct console *co, char *options) | ||
1152 | { | ||
1153 | struct bfin_serial_port *uart; | ||
1154 | int baud = 57600; | ||
1155 | int bits = 8; | ||
1156 | int parity = 'n'; | ||
1157 | # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \ | ||
1158 | defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS) | ||
1159 | int flow = 'r'; | ||
1160 | # else | ||
1161 | int flow = 'n'; | ||
1162 | # endif | ||
1163 | |||
1164 | /* | ||
1165 | * Check whether an invalid uart number has been specified, and | ||
1166 | * if so, search for the first available port that does have | ||
1167 | * console support. | ||
1168 | */ | ||
1169 | if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS) | ||
1170 | return -ENODEV; | ||
1171 | |||
1172 | uart = bfin_serial_ports[co->index]; | ||
1173 | if (!uart) | ||
1174 | return -ENODEV; | ||
1175 | |||
1176 | if (options) | ||
1177 | uart_parse_options(options, &baud, &parity, &bits, &flow); | ||
1178 | else | ||
1179 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); | ||
1180 | |||
1181 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); | ||
1182 | } | ||
1183 | |||
1184 | static struct console bfin_serial_console = { | ||
1185 | .name = BFIN_SERIAL_DEV_NAME, | ||
1186 | .write = bfin_serial_console_write, | ||
1187 | .device = uart_console_device, | ||
1188 | .setup = bfin_serial_console_setup, | ||
1189 | .flags = CON_PRINTBUFFER, | ||
1190 | .index = -1, | ||
1191 | .data = &bfin_serial_reg, | ||
1192 | }; | ||
1193 | #define BFIN_SERIAL_CONSOLE (&bfin_serial_console) | ||
1194 | #else | ||
1195 | #define BFIN_SERIAL_CONSOLE NULL | ||
1196 | #endif /* CONFIG_SERIAL_BFIN_CONSOLE */ | ||
1197 | |||
1198 | #ifdef CONFIG_EARLY_PRINTK | ||
1199 | static struct bfin_serial_port bfin_earlyprintk_port; | ||
1200 | #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk" | ||
1201 | |||
1202 | /* | ||
1203 | * Interrupts are disabled on entering | ||
1204 | */ | ||
1205 | static void | ||
1206 | bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count) | ||
1207 | { | ||
1208 | unsigned long flags; | ||
1209 | |||
1210 | if (bfin_earlyprintk_port.port.line != co->index) | ||
1211 | return; | ||
1212 | |||
1213 | spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags); | ||
1214 | uart_console_write(&bfin_earlyprintk_port.port, s, count, | ||
1215 | bfin_serial_console_putchar); | ||
1216 | spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags); | ||
1217 | } | ||
1218 | |||
1219 | /* | ||
1220 | * This should have a .setup or .early_setup in it, but then things get called | ||
1221 | * without the command line options, and the baud rate gets messed up - so | ||
1222 | * don't let the common infrastructure play with things. (see calls to setup | ||
1223 | * & earlysetup in ./kernel/printk.c:register_console() | ||
1224 | */ | ||
1225 | static struct __initdata console bfin_early_serial_console = { | ||
1226 | .name = "early_BFuart", | ||
1227 | .write = bfin_earlyprintk_console_write, | ||
1228 | .device = uart_console_device, | ||
1229 | .flags = CON_PRINTBUFFER, | ||
1230 | .index = -1, | ||
1231 | .data = &bfin_serial_reg, | ||
1232 | }; | ||
1233 | #endif | ||
1234 | |||
1235 | static struct uart_driver bfin_serial_reg = { | ||
1236 | .owner = THIS_MODULE, | ||
1237 | .driver_name = DRIVER_NAME, | ||
1238 | .dev_name = BFIN_SERIAL_DEV_NAME, | ||
1239 | .major = BFIN_SERIAL_MAJOR, | ||
1240 | .minor = BFIN_SERIAL_MINOR, | ||
1241 | .nr = BFIN_UART_NR_PORTS, | ||
1242 | .cons = BFIN_SERIAL_CONSOLE, | ||
1243 | }; | ||
1244 | |||
1245 | static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state) | ||
1246 | { | ||
1247 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); | ||
1248 | |||
1249 | return uart_suspend_port(&bfin_serial_reg, &uart->port); | ||
1250 | } | ||
1251 | |||
1252 | static int bfin_serial_resume(struct platform_device *pdev) | ||
1253 | { | ||
1254 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); | ||
1255 | |||
1256 | return uart_resume_port(&bfin_serial_reg, &uart->port); | ||
1257 | } | ||
1258 | |||
1259 | static int bfin_serial_probe(struct platform_device *pdev) | ||
1260 | { | ||
1261 | struct resource *res; | ||
1262 | struct bfin_serial_port *uart = NULL; | ||
1263 | int ret = 0; | ||
1264 | |||
1265 | if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) { | ||
1266 | dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n"); | ||
1267 | return -ENOENT; | ||
1268 | } | ||
1269 | |||
1270 | if (bfin_serial_ports[pdev->id] == NULL) { | ||
1271 | |||
1272 | uart = kzalloc(sizeof(*uart), GFP_KERNEL); | ||
1273 | if (!uart) { | ||
1274 | dev_err(&pdev->dev, | ||
1275 | "fail to malloc bfin_serial_port\n"); | ||
1276 | return -ENOMEM; | ||
1277 | } | ||
1278 | bfin_serial_ports[pdev->id] = uart; | ||
1279 | |||
1280 | #ifdef CONFIG_EARLY_PRINTK | ||
1281 | if (!(bfin_earlyprintk_port.port.membase | ||
1282 | && bfin_earlyprintk_port.port.line == pdev->id)) { | ||
1283 | /* | ||
1284 | * If the peripheral PINs of current port is allocated | ||
1285 | * in earlyprintk probe stage, don't do it again. | ||
1286 | */ | ||
1287 | #endif | ||
1288 | ret = peripheral_request_list( | ||
1289 | (unsigned short *)pdev->dev.platform_data, DRIVER_NAME); | ||
1290 | if (ret) { | ||
1291 | dev_err(&pdev->dev, | ||
1292 | "fail to request bfin serial peripherals\n"); | ||
1293 | goto out_error_free_mem; | ||
1294 | } | ||
1295 | #ifdef CONFIG_EARLY_PRINTK | ||
1296 | } | ||
1297 | #endif | ||
1298 | |||
1299 | spin_lock_init(&uart->port.lock); | ||
1300 | uart->port.uartclk = get_sclk(); | ||
1301 | uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE; | ||
1302 | uart->port.ops = &bfin_serial_pops; | ||
1303 | uart->port.line = pdev->id; | ||
1304 | uart->port.iotype = UPIO_MEM; | ||
1305 | uart->port.flags = UPF_BOOT_AUTOCONF; | ||
1306 | |||
1307 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
1308 | if (res == NULL) { | ||
1309 | dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); | ||
1310 | ret = -ENOENT; | ||
1311 | goto out_error_free_peripherals; | ||
1312 | } | ||
1313 | |||
1314 | uart->port.membase = ioremap(res->start, resource_size(res)); | ||
1315 | if (!uart->port.membase) { | ||
1316 | dev_err(&pdev->dev, "Cannot map uart IO\n"); | ||
1317 | ret = -ENXIO; | ||
1318 | goto out_error_free_peripherals; | ||
1319 | } | ||
1320 | uart->port.mapbase = res->start; | ||
1321 | |||
1322 | uart->tx_irq = platform_get_irq(pdev, 0); | ||
1323 | if (uart->tx_irq < 0) { | ||
1324 | dev_err(&pdev->dev, "No uart TX IRQ specified\n"); | ||
1325 | ret = -ENOENT; | ||
1326 | goto out_error_unmap; | ||
1327 | } | ||
1328 | |||
1329 | uart->rx_irq = platform_get_irq(pdev, 1); | ||
1330 | if (uart->rx_irq < 0) { | ||
1331 | dev_err(&pdev->dev, "No uart RX IRQ specified\n"); | ||
1332 | ret = -ENOENT; | ||
1333 | goto out_error_unmap; | ||
1334 | } | ||
1335 | uart->port.irq = uart->rx_irq; | ||
1336 | |||
1337 | uart->status_irq = platform_get_irq(pdev, 2); | ||
1338 | if (uart->status_irq < 0) { | ||
1339 | dev_err(&pdev->dev, "No uart status IRQ specified\n"); | ||
1340 | ret = -ENOENT; | ||
1341 | goto out_error_unmap; | ||
1342 | } | ||
1343 | |||
1344 | #ifdef CONFIG_SERIAL_BFIN_DMA | ||
1345 | spin_lock_init(&uart->rx_lock); | ||
1346 | uart->tx_done = 1; | ||
1347 | uart->tx_count = 0; | ||
1348 | |||
1349 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | ||
1350 | if (res == NULL) { | ||
1351 | dev_err(&pdev->dev, "No uart TX DMA channel specified\n"); | ||
1352 | ret = -ENOENT; | ||
1353 | goto out_error_unmap; | ||
1354 | } | ||
1355 | uart->tx_dma_channel = res->start; | ||
1356 | |||
1357 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); | ||
1358 | if (res == NULL) { | ||
1359 | dev_err(&pdev->dev, "No uart RX DMA channel specified\n"); | ||
1360 | ret = -ENOENT; | ||
1361 | goto out_error_unmap; | ||
1362 | } | ||
1363 | uart->rx_dma_channel = res->start; | ||
1364 | |||
1365 | init_timer(&(uart->rx_dma_timer)); | ||
1366 | #endif | ||
1367 | |||
1368 | #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \ | ||
1369 | defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS) | ||
1370 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | ||
1371 | if (res == NULL) | ||
1372 | uart->cts_pin = -1; | ||
1373 | else | ||
1374 | uart->cts_pin = res->start; | ||
1375 | |||
1376 | res = platform_get_resource(pdev, IORESOURCE_IO, 1); | ||
1377 | if (res == NULL) | ||
1378 | uart->rts_pin = -1; | ||
1379 | else | ||
1380 | uart->rts_pin = res->start; | ||
1381 | # if defined(CONFIG_SERIAL_BFIN_CTSRTS) | ||
1382 | if (uart->rts_pin >= 0) | ||
1383 | gpio_request(uart->rts_pin, DRIVER_NAME); | ||
1384 | # endif | ||
1385 | #endif | ||
1386 | } | ||
1387 | |||
1388 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | ||
1389 | if (!is_early_platform_device(pdev)) { | ||
1390 | #endif | ||
1391 | uart = bfin_serial_ports[pdev->id]; | ||
1392 | uart->port.dev = &pdev->dev; | ||
1393 | dev_set_drvdata(&pdev->dev, uart); | ||
1394 | ret = uart_add_one_port(&bfin_serial_reg, &uart->port); | ||
1395 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | ||
1396 | } | ||
1397 | #endif | ||
1398 | |||
1399 | if (!ret) | ||
1400 | return 0; | ||
1401 | |||
1402 | if (uart) { | ||
1403 | out_error_unmap: | ||
1404 | iounmap(uart->port.membase); | ||
1405 | out_error_free_peripherals: | ||
1406 | peripheral_free_list( | ||
1407 | (unsigned short *)pdev->dev.platform_data); | ||
1408 | out_error_free_mem: | ||
1409 | kfree(uart); | ||
1410 | bfin_serial_ports[pdev->id] = NULL; | ||
1411 | } | ||
1412 | |||
1413 | return ret; | ||
1414 | } | ||
1415 | |||
1416 | static int __devexit bfin_serial_remove(struct platform_device *pdev) | ||
1417 | { | ||
1418 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); | ||
1419 | |||
1420 | dev_set_drvdata(&pdev->dev, NULL); | ||
1421 | |||
1422 | if (uart) { | ||
1423 | uart_remove_one_port(&bfin_serial_reg, &uart->port); | ||
1424 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS | ||
1425 | if (uart->rts_pin >= 0) | ||
1426 | gpio_free(uart->rts_pin); | ||
1427 | #endif | ||
1428 | iounmap(uart->port.membase); | ||
1429 | peripheral_free_list( | ||
1430 | (unsigned short *)pdev->dev.platform_data); | ||
1431 | kfree(uart); | ||
1432 | bfin_serial_ports[pdev->id] = NULL; | ||
1433 | } | ||
1434 | |||
1435 | return 0; | ||
1436 | } | ||
1437 | |||
1438 | static struct platform_driver bfin_serial_driver = { | ||
1439 | .probe = bfin_serial_probe, | ||
1440 | .remove = __devexit_p(bfin_serial_remove), | ||
1441 | .suspend = bfin_serial_suspend, | ||
1442 | .resume = bfin_serial_resume, | ||
1443 | .driver = { | ||
1444 | .name = DRIVER_NAME, | ||
1445 | .owner = THIS_MODULE, | ||
1446 | }, | ||
1447 | }; | ||
1448 | |||
1449 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) | ||
1450 | static __initdata struct early_platform_driver early_bfin_serial_driver = { | ||
1451 | .class_str = CLASS_BFIN_CONSOLE, | ||
1452 | .pdrv = &bfin_serial_driver, | ||
1453 | .requested_id = EARLY_PLATFORM_ID_UNSET, | ||
1454 | }; | ||
1455 | |||
1456 | static int __init bfin_serial_rs_console_init(void) | ||
1457 | { | ||
1458 | early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME); | ||
1459 | |||
1460 | early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0); | ||
1461 | |||
1462 | register_console(&bfin_serial_console); | ||
1463 | |||
1464 | return 0; | ||
1465 | } | ||
1466 | console_initcall(bfin_serial_rs_console_init); | ||
1467 | #endif | ||
1468 | |||
1469 | #ifdef CONFIG_EARLY_PRINTK | ||
1470 | /* | ||
1471 | * Memory can't be allocated dynamically during earlyprink init stage. | ||
1472 | * So, do individual probe for earlyprink with a static uart port variable. | ||
1473 | */ | ||
1474 | static int bfin_earlyprintk_probe(struct platform_device *pdev) | ||
1475 | { | ||
1476 | struct resource *res; | ||
1477 | int ret; | ||
1478 | |||
1479 | if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) { | ||
1480 | dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n"); | ||
1481 | return -ENOENT; | ||
1482 | } | ||
1483 | |||
1484 | ret = peripheral_request_list( | ||
1485 | (unsigned short *)pdev->dev.platform_data, DRIVER_NAME); | ||
1486 | if (ret) { | ||
1487 | dev_err(&pdev->dev, | ||
1488 | "fail to request bfin serial peripherals\n"); | ||
1489 | return ret; | ||
1490 | } | ||
1491 | |||
1492 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
1493 | if (res == NULL) { | ||
1494 | dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); | ||
1495 | ret = -ENOENT; | ||
1496 | goto out_error_free_peripherals; | ||
1497 | } | ||
1498 | |||
1499 | bfin_earlyprintk_port.port.membase = ioremap(res->start, | ||
1500 | resource_size(res)); | ||
1501 | if (!bfin_earlyprintk_port.port.membase) { | ||
1502 | dev_err(&pdev->dev, "Cannot map uart IO\n"); | ||
1503 | ret = -ENXIO; | ||
1504 | goto out_error_free_peripherals; | ||
1505 | } | ||
1506 | bfin_earlyprintk_port.port.mapbase = res->start; | ||
1507 | bfin_earlyprintk_port.port.line = pdev->id; | ||
1508 | bfin_earlyprintk_port.port.uartclk = get_sclk(); | ||
1509 | bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE; | ||
1510 | spin_lock_init(&bfin_earlyprintk_port.port.lock); | ||
1511 | |||
1512 | return 0; | ||
1513 | |||
1514 | out_error_free_peripherals: | ||
1515 | peripheral_free_list( | ||
1516 | (unsigned short *)pdev->dev.platform_data); | ||
1517 | |||
1518 | return ret; | ||
1519 | } | ||
1520 | |||
1521 | static struct platform_driver bfin_earlyprintk_driver = { | ||
1522 | .probe = bfin_earlyprintk_probe, | ||
1523 | .driver = { | ||
1524 | .name = DRIVER_NAME, | ||
1525 | .owner = THIS_MODULE, | ||
1526 | }, | ||
1527 | }; | ||
1528 | |||
1529 | static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = { | ||
1530 | .class_str = CLASS_BFIN_EARLYPRINTK, | ||
1531 | .pdrv = &bfin_earlyprintk_driver, | ||
1532 | .requested_id = EARLY_PLATFORM_ID_UNSET, | ||
1533 | }; | ||
1534 | |||
1535 | struct console __init *bfin_earlyserial_init(unsigned int port, | ||
1536 | unsigned int cflag) | ||
1537 | { | ||
1538 | struct ktermios t; | ||
1539 | char port_name[20]; | ||
1540 | |||
1541 | if (port < 0 || port >= BFIN_UART_NR_PORTS) | ||
1542 | return NULL; | ||
1543 | |||
1544 | /* | ||
1545 | * Only probe resource of the given port in earlyprintk boot arg. | ||
1546 | * The expected port id should be indicated in port name string. | ||
1547 | */ | ||
1548 | snprintf(port_name, 20, DRIVER_NAME ".%d", port); | ||
1549 | early_platform_driver_register(&early_bfin_earlyprintk_driver, | ||
1550 | port_name); | ||
1551 | early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0); | ||
1552 | |||
1553 | if (!bfin_earlyprintk_port.port.membase) | ||
1554 | return NULL; | ||
1555 | |||
1556 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | ||
1557 | /* | ||
1558 | * If we are using early serial, don't let the normal console rewind | ||
1559 | * log buffer, since that causes things to be printed multiple times | ||
1560 | */ | ||
1561 | bfin_serial_console.flags &= ~CON_PRINTBUFFER; | ||
1562 | #endif | ||
1563 | |||
1564 | bfin_early_serial_console.index = port; | ||
1565 | t.c_cflag = cflag; | ||
1566 | t.c_iflag = 0; | ||
1567 | t.c_oflag = 0; | ||
1568 | t.c_lflag = ICANON; | ||
1569 | t.c_line = port; | ||
1570 | bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t); | ||
1571 | |||
1572 | return &bfin_early_serial_console; | ||
1573 | } | ||
1574 | #endif /* CONFIG_EARLY_PRINTK */ | ||
1575 | |||
1576 | static int __init bfin_serial_init(void) | ||
1577 | { | ||
1578 | int ret; | ||
1579 | |||
1580 | pr_info("Blackfin serial driver\n"); | ||
1581 | |||
1582 | ret = uart_register_driver(&bfin_serial_reg); | ||
1583 | if (ret) { | ||
1584 | pr_err("failed to register %s:%d\n", | ||
1585 | bfin_serial_reg.driver_name, ret); | ||
1586 | } | ||
1587 | |||
1588 | ret = platform_driver_register(&bfin_serial_driver); | ||
1589 | if (ret) { | ||
1590 | pr_err("fail to register bfin uart\n"); | ||
1591 | uart_unregister_driver(&bfin_serial_reg); | ||
1592 | } | ||
1593 | |||
1594 | return ret; | ||
1595 | } | ||
1596 | |||
1597 | static void __exit bfin_serial_exit(void) | ||
1598 | { | ||
1599 | platform_driver_unregister(&bfin_serial_driver); | ||
1600 | uart_unregister_driver(&bfin_serial_reg); | ||
1601 | } | ||
1602 | |||
1603 | |||
1604 | module_init(bfin_serial_init); | ||
1605 | module_exit(bfin_serial_exit); | ||
1606 | |||
1607 | MODULE_AUTHOR("Sonic Zhang, Aubrey Li"); | ||
1608 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); | ||
1609 | MODULE_LICENSE("GPL"); | ||
1610 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); | ||
1611 | MODULE_ALIAS("platform:bfin-uart"); | ||