Commit | Line | Data |
---|---|---|
e3b3d0f5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
194de561 | 2 | /* |
1ba7a3ee | 3 | * Blackfin On-Chip Serial Driver |
194de561 | 4 | * |
b06d2f20 | 5 | * Copyright 2006-2011 Analog Devices Inc. |
194de561 | 6 | * |
1ba7a3ee | 7 | * Enter bugs at http://blackfin.uclinux.org/ |
194de561 | 8 | * |
1ba7a3ee | 9 | * Licensed under the GPL-2 or later. |
194de561 BW |
10 | */ |
11 | ||
12 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
13 | #define SUPPORT_SYSRQ | |
14 | #endif | |
15 | ||
57afb399 SZ |
16 | #define DRIVER_NAME "bfin-uart" |
17 | #define pr_fmt(fmt) DRIVER_NAME ": " fmt | |
18 | ||
194de561 BW |
19 | #include <linux/module.h> |
20 | #include <linux/ioport.h> | |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
599b714c | 22 | #include <linux/io.h> |
194de561 BW |
23 | #include <linux/init.h> |
24 | #include <linux/console.h> | |
25 | #include <linux/sysrq.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/tty.h> | |
28 | #include <linux/tty_flip.h> | |
29 | #include <linux/serial_core.h> | |
57afb399 SZ |
30 | #include <linux/gpio.h> |
31 | #include <linux/irq.h> | |
474f1a66 | 32 | #include <linux/kgdb.h> |
57afb399 SZ |
33 | #include <linux/slab.h> |
34 | #include <linux/dma-mapping.h> | |
194de561 | 35 | |
57afb399 | 36 | #include <asm/portmux.h> |
194de561 | 37 | #include <asm/cacheflush.h> |
57afb399 | 38 | #include <asm/dma.h> |
57afb399 | 39 | #include <asm/bfin_serial.h> |
194de561 | 40 | |
607c268e MF |
41 | #ifdef CONFIG_SERIAL_BFIN_MODULE |
42 | # undef CONFIG_EARLY_PRINTK | |
43 | #endif | |
44 | ||
194de561 | 45 | /* UART name and device definitions */ |
57afb399 | 46 | #define BFIN_SERIAL_DEV_NAME "ttyBF" |
194de561 BW |
47 | #define BFIN_SERIAL_MAJOR 204 |
48 | #define BFIN_SERIAL_MINOR 64 | |
49 | ||
57afb399 | 50 | static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS]; |
c9607ecc | 51 | |
52e15f0e SZ |
52 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
53 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | |
54 | ||
55 | # ifndef CONFIG_SERIAL_BFIN_PIO | |
56 | # error KGDB only support UART in PIO mode. | |
57 | # endif | |
58 | ||
59 | static int kgdboc_port_line; | |
60 | static int kgdboc_break_enabled; | |
61 | #endif | |
194de561 BW |
62 | /* |
63 | * Setup for console. Argument comes from the menuconfig | |
64 | */ | |
65 | #define DMA_RX_XCOUNT 512 | |
66 | #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT) | |
67 | ||
0aef4564 | 68 | #define DMA_RX_FLUSH_JIFFIES (HZ / 50) |
194de561 BW |
69 | |
70 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
71 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); | |
72 | #else | |
194de561 | 73 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart); |
194de561 BW |
74 | #endif |
75 | ||
80d5c474 GY |
76 | static void bfin_serial_reset_irda(struct uart_port *port); |
77 | ||
60d0da51 VR |
78 | #if defined(SERIAL_BFIN_CTSRTS) || \ |
79 | defined(SERIAL_BFIN_HARD_CTSRTS) | |
d307d36a SZ |
80 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) |
81 | { | |
82 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
83 | if (uart->cts_pin < 0) | |
84 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
85 | ||
86 | /* CTS PIN is negative assertive. */ | |
87 | if (UART_GET_CTS(uart)) | |
88 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
89 | else | |
90 | return TIOCM_DSR | TIOCM_CAR; | |
91 | } | |
92 | ||
93 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
94 | { | |
95 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
96 | if (uart->rts_pin < 0) | |
97 | return; | |
98 | ||
99 | /* RTS PIN is negative assertive. */ | |
100 | if (mctrl & TIOCM_RTS) | |
101 | UART_ENABLE_RTS(uart); | |
102 | else | |
103 | UART_DISABLE_RTS(uart); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Handle any change of modem status signal. | |
108 | */ | |
109 | static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id) | |
110 | { | |
111 | struct bfin_serial_port *uart = dev_id; | |
d01f4d18 PH |
112 | struct uart_port *uport = &uart->port; |
113 | unsigned int status = bfin_serial_get_mctrl(uport); | |
60d0da51 | 114 | #ifdef SERIAL_BFIN_HARD_CTSRTS |
64851636 | 115 | |
d307d36a | 116 | UART_CLEAR_SCTS(uart); |
d01f4d18 | 117 | if (uport->hw_stopped) { |
64851636 | 118 | if (status) { |
d01f4d18 PH |
119 | uport->hw_stopped = 0; |
120 | uart_write_wakeup(uport); | |
64851636 SZ |
121 | } |
122 | } else { | |
123 | if (!status) | |
d01f4d18 | 124 | uport->hw_stopped = 1; |
64851636 | 125 | } |
8620d3e5 | 126 | #else |
d01f4d18 | 127 | uart_handle_cts_change(uport, status & TIOCM_CTS); |
8620d3e5 | 128 | #endif |
d307d36a SZ |
129 | |
130 | return IRQ_HANDLED; | |
131 | } | |
132 | #else | |
133 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) | |
134 | { | |
135 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
136 | } | |
137 | ||
138 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
139 | { | |
140 | } | |
141 | #endif | |
142 | ||
194de561 BW |
143 | /* |
144 | * interrupts are disabled on entry | |
145 | */ | |
146 | static void bfin_serial_stop_tx(struct uart_port *port) | |
147 | { | |
148 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
68a784cb | 149 | #ifdef CONFIG_SERIAL_BFIN_DMA |
ebd2c8f6 | 150 | struct circ_buf *xmit = &uart->port.state->xmit; |
68a784cb | 151 | #endif |
194de561 | 152 | |
f4d640c9 | 153 | while (!(UART_GET_LSR(uart) & TEMT)) |
0711d857 | 154 | cpu_relax(); |
f4d640c9 | 155 | |
194de561 BW |
156 | #ifdef CONFIG_SERIAL_BFIN_DMA |
157 | disable_dma(uart->tx_dma_channel); | |
0711d857 SZ |
158 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
159 | uart->port.icount.tx += uart->tx_count; | |
160 | uart->tx_count = 0; | |
161 | uart->tx_done = 1; | |
f4d640c9 | 162 | #else |
b06d2f20 | 163 | #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x) |
f4d640c9 RH |
164 | /* Clear TFI bit */ |
165 | UART_PUT_LSR(uart, TFI); | |
194de561 | 166 | #endif |
89bf6dc5 | 167 | UART_CLEAR_IER(uart, ETBEI); |
f4d640c9 | 168 | #endif |
194de561 BW |
169 | } |
170 | ||
171 | /* | |
172 | * port is locked and interrupts are disabled | |
173 | */ | |
174 | static void bfin_serial_start_tx(struct uart_port *port) | |
175 | { | |
176 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
ebd2c8f6 | 177 | struct tty_struct *tty = uart->port.state->port.tty; |
80d5c474 GY |
178 | |
179 | /* | |
180 | * To avoid losting RX interrupt, we reset IR function | |
181 | * before sending data. | |
182 | */ | |
adc8d746 | 183 | if (tty->termios.c_line == N_IRDA) |
80d5c474 | 184 | bfin_serial_reset_irda(port); |
194de561 BW |
185 | |
186 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
0711d857 SZ |
187 | if (uart->tx_done) |
188 | bfin_serial_dma_tx_chars(uart); | |
f4d640c9 | 189 | #else |
f4d640c9 | 190 | UART_SET_IER(uart, ETBEI); |
a359cca7 | 191 | bfin_serial_tx_chars(uart); |
f4d640c9 | 192 | #endif |
194de561 BW |
193 | } |
194 | ||
195 | /* | |
196 | * Interrupts are enabled | |
197 | */ | |
198 | static void bfin_serial_stop_rx(struct uart_port *port) | |
199 | { | |
200 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
52e15f0e | 201 | |
f4d640c9 | 202 | UART_CLEAR_IER(uart, ERBFI); |
194de561 BW |
203 | } |
204 | ||
50e2e15a | 205 | #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO) |
8851c71e MF |
206 | # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold) |
207 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v)) | |
208 | #else | |
209 | # define UART_GET_ANOMALY_THRESHOLD(uart) 0 | |
210 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) | |
211 | #endif | |
212 | ||
194de561 | 213 | #ifdef CONFIG_SERIAL_BFIN_PIO |
194de561 BW |
214 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) |
215 | { | |
194de561 | 216 | unsigned int status, ch, flg; |
3ac4ae47 | 217 | static u64 anomaly_start; |
194de561 | 218 | |
759eb040 | 219 | status = UART_GET_LSR(uart); |
0bcfd70e MF |
220 | UART_CLEAR_LSR(uart); |
221 | ||
bb7e58f8 SZ |
222 | ch = UART_GET_CHAR(uart); |
223 | uart->port.icount.rx++; | |
194de561 | 224 | |
52e15f0e SZ |
225 | #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
226 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) | |
cdc592d5 SZ |
227 | if (kgdb_connected && kgdboc_port_line == uart->port.line |
228 | && kgdboc_break_enabled) | |
52e15f0e SZ |
229 | if (ch == 0x3) {/* Ctrl + C */ |
230 | kgdb_breakpoint(); | |
474f1a66 | 231 | return; |
474f1a66 | 232 | } |
52e15f0e | 233 | |
2e124b4a | 234 | if (!uart->port.state) |
52e15f0e | 235 | return; |
474f1a66 | 236 | #endif |
50e2e15a | 237 | if (ANOMALY_05000363) { |
8851c71e MF |
238 | /* The BF533 (and BF561) family of processors have a nice anomaly |
239 | * where they continuously generate characters for a "single" break. | |
bbf275f0 | 240 | * We have to basically ignore this flood until the "next" valid |
8851c71e MF |
241 | * character comes across. Due to the nature of the flood, it is |
242 | * not possible to reliably catch bytes that are sent too quickly | |
243 | * after this break. So application code talking to the Blackfin | |
244 | * which sends a break signal must allow at least 1.5 character | |
245 | * times after the end of the break for things to stabilize. This | |
246 | * timeout was picked as it must absolutely be larger than 1 | |
247 | * character time +/- some percent. So 1.5 sounds good. All other | |
248 | * Blackfin families operate properly. Woo. | |
bbf275f0 | 249 | */ |
3ac4ae47 D |
250 | if (anomaly_start > 0) { |
251 | u64 curr, nsecs, threshold_ns; | |
8851c71e MF |
252 | |
253 | if ((~ch & (~ch + 1)) & 0xff) | |
254 | goto known_good_char; | |
255 | ||
3ac4ae47 D |
256 | curr = ktime_get_ns(); |
257 | nsecs = curr - anomaly_start; | |
258 | if (nsecs >> 32) | |
8851c71e MF |
259 | goto known_good_char; |
260 | ||
3ac4ae47 D |
261 | threshold_ns = UART_GET_ANOMALY_THRESHOLD(uart) |
262 | * NSEC_PER_USEC; | |
263 | if (nsecs > threshold_ns) | |
8851c71e MF |
264 | goto known_good_char; |
265 | ||
266 | if (ch) | |
3ac4ae47 | 267 | anomaly_start = 0; |
8851c71e MF |
268 | else |
269 | anomaly_start = curr; | |
270 | ||
271 | return; | |
272 | ||
273 | known_good_char: | |
e482a237 | 274 | status &= ~BI; |
3ac4ae47 | 275 | anomaly_start = 0; |
bbf275f0 | 276 | } |
194de561 | 277 | } |
194de561 BW |
278 | |
279 | if (status & BI) { | |
50e2e15a | 280 | if (ANOMALY_05000363) |
8851c71e | 281 | if (bfin_revid() < 5) |
3ac4ae47 | 282 | anomaly_start = ktime_get_ns(); |
194de561 BW |
283 | uart->port.icount.brk++; |
284 | if (uart_handle_break(&uart->port)) | |
285 | goto ignore_char; | |
9808901b | 286 | status &= ~(PE | FE); |
2ac5ee47 MF |
287 | } |
288 | if (status & PE) | |
194de561 | 289 | uart->port.icount.parity++; |
2ac5ee47 | 290 | if (status & OE) |
194de561 | 291 | uart->port.icount.overrun++; |
2ac5ee47 | 292 | if (status & FE) |
194de561 | 293 | uart->port.icount.frame++; |
2ac5ee47 MF |
294 | |
295 | status &= uart->port.read_status_mask; | |
296 | ||
297 | if (status & BI) | |
298 | flg = TTY_BREAK; | |
299 | else if (status & PE) | |
300 | flg = TTY_PARITY; | |
301 | else if (status & FE) | |
302 | flg = TTY_FRAME; | |
303 | else | |
194de561 BW |
304 | flg = TTY_NORMAL; |
305 | ||
306 | if (uart_handle_sysrq_char(&uart->port, ch)) | |
307 | goto ignore_char; | |
194de561 | 308 | |
2ac5ee47 MF |
309 | uart_insert_char(&uart->port, status, OE, ch, flg); |
310 | ||
311 | ignore_char: | |
2e124b4a | 312 | tty_flip_buffer_push(&uart->port.state->port); |
194de561 BW |
313 | } |
314 | ||
315 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) | |
316 | { | |
ebd2c8f6 | 317 | struct circ_buf *xmit = &uart->port.state->xmit; |
194de561 | 318 | |
194de561 | 319 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
b06d2f20 | 320 | #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x) |
5ffdeea2 SZ |
321 | /* Clear TFI bit */ |
322 | UART_PUT_LSR(uart, TFI); | |
323 | #endif | |
0efa4f2c SZ |
324 | /* Anomaly notes: |
325 | * 05000215 - we always clear ETBEI within last UART TX | |
326 | * interrupt to end a string. It is always set | |
327 | * when start a new tx. | |
328 | */ | |
5ffdeea2 | 329 | UART_CLEAR_IER(uart, ETBEI); |
194de561 BW |
330 | return; |
331 | } | |
332 | ||
f30ac0ce SZ |
333 | if (uart->port.x_char) { |
334 | UART_PUT_CHAR(uart, uart->port.x_char); | |
335 | uart->port.icount.tx++; | |
336 | uart->port.x_char = 0; | |
337 | } | |
338 | ||
759eb040 SZ |
339 | while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) { |
340 | UART_PUT_CHAR(uart, xmit->buf[xmit->tail]); | |
341 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
342 | uart->port.icount.tx++; | |
759eb040 | 343 | } |
194de561 BW |
344 | |
345 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
346 | uart_write_wakeup(&uart->port); | |
194de561 BW |
347 | } |
348 | ||
5c4e472b AL |
349 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) |
350 | { | |
351 | struct bfin_serial_port *uart = dev_id; | |
352 | ||
0bcfd70e | 353 | while (UART_GET_LSR(uart) & DR) |
f4d640c9 | 354 | bfin_serial_rx_chars(uart); |
759eb040 | 355 | |
5c4e472b AL |
356 | return IRQ_HANDLED; |
357 | } | |
358 | ||
359 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) | |
194de561 BW |
360 | { |
361 | struct bfin_serial_port *uart = dev_id; | |
194de561 | 362 | |
f4d640c9 | 363 | spin_lock(&uart->port.lock); |
0bcfd70e | 364 | if (UART_GET_LSR(uart) & THRE) |
f4d640c9 | 365 | bfin_serial_tx_chars(uart); |
f4d640c9 | 366 | spin_unlock(&uart->port.lock); |
759eb040 | 367 | |
194de561 BW |
368 | return IRQ_HANDLED; |
369 | } | |
4cb4f22b | 370 | #endif |
194de561 | 371 | |
194de561 BW |
372 | #ifdef CONFIG_SERIAL_BFIN_DMA |
373 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) | |
374 | { | |
ebd2c8f6 | 375 | struct circ_buf *xmit = &uart->port.state->xmit; |
194de561 | 376 | |
194de561 BW |
377 | uart->tx_done = 0; |
378 | ||
1b73351c | 379 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
0711d857 | 380 | uart->tx_count = 0; |
1b73351c SZ |
381 | uart->tx_done = 1; |
382 | return; | |
383 | } | |
384 | ||
194de561 BW |
385 | if (uart->port.x_char) { |
386 | UART_PUT_CHAR(uart, uart->port.x_char); | |
387 | uart->port.icount.tx++; | |
388 | uart->port.x_char = 0; | |
194de561 | 389 | } |
1b73351c | 390 | |
194de561 BW |
391 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); |
392 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) | |
393 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; | |
394 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), | |
395 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); | |
396 | set_dma_config(uart->tx_dma_channel, | |
397 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, | |
398 | INTR_ON_BUF, | |
399 | DIMENSION_LINEAR, | |
2047e40d MH |
400 | DATA_SIZE_8, |
401 | DMA_SYNC_RESTART)); | |
194de561 BW |
402 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); |
403 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); | |
404 | set_dma_x_modify(uart->tx_dma_channel, 1); | |
f9d36da9 | 405 | SSYNC(); |
194de561 | 406 | enable_dma(uart->tx_dma_channel); |
99ee7b5f | 407 | |
f4d640c9 | 408 | UART_SET_IER(uart, ETBEI); |
194de561 BW |
409 | } |
410 | ||
2ac5ee47 | 411 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) |
194de561 | 412 | { |
194de561 BW |
413 | int i, flg, status; |
414 | ||
415 | status = UART_GET_LSR(uart); | |
0bcfd70e MF |
416 | UART_CLEAR_LSR(uart); |
417 | ||
56f5de8f SZ |
418 | uart->port.icount.rx += |
419 | CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, | |
420 | UART_XMIT_SIZE); | |
194de561 BW |
421 | |
422 | if (status & BI) { | |
423 | uart->port.icount.brk++; | |
424 | if (uart_handle_break(&uart->port)) | |
425 | goto dma_ignore_char; | |
9808901b | 426 | status &= ~(PE | FE); |
2ac5ee47 MF |
427 | } |
428 | if (status & PE) | |
194de561 | 429 | uart->port.icount.parity++; |
2ac5ee47 | 430 | if (status & OE) |
194de561 | 431 | uart->port.icount.overrun++; |
2ac5ee47 | 432 | if (status & FE) |
194de561 | 433 | uart->port.icount.frame++; |
2ac5ee47 MF |
434 | |
435 | status &= uart->port.read_status_mask; | |
436 | ||
437 | if (status & BI) | |
438 | flg = TTY_BREAK; | |
439 | else if (status & PE) | |
440 | flg = TTY_PARITY; | |
441 | else if (status & FE) | |
442 | flg = TTY_FRAME; | |
443 | else | |
194de561 BW |
444 | flg = TTY_NORMAL; |
445 | ||
8c4210e3 | 446 | for (i = uart->rx_dma_buf.tail; ; i++) { |
56f5de8f SZ |
447 | if (i >= UART_XMIT_SIZE) |
448 | i = 0; | |
8c4210e3 SZ |
449 | if (i == uart->rx_dma_buf.head) |
450 | break; | |
56f5de8f SZ |
451 | if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) |
452 | uart_insert_char(&uart->port, status, OE, | |
453 | uart->rx_dma_buf.buf[i], flg); | |
194de561 | 454 | } |
2ac5ee47 MF |
455 | |
456 | dma_ignore_char: | |
2e124b4a | 457 | tty_flip_buffer_push(&uart->port.state->port); |
194de561 BW |
458 | } |
459 | ||
1209a813 | 460 | void bfin_serial_rx_dma_timeout(struct timer_list *t) |
194de561 | 461 | { |
1209a813 | 462 | struct bfin_serial_port *uart = from_timer(uart, t, rx_dma_timer); |
59e4e3e6 | 463 | int x_pos, pos; |
9642dbe7 | 464 | unsigned long flags; |
68a784cb | 465 | |
1569039d | 466 | dma_disable_irq_nosync(uart->rx_dma_channel); |
9642dbe7 | 467 | spin_lock_irqsave(&uart->rx_lock, flags); |
194de561 | 468 | |
8516c568 SZ |
469 | /* 2D DMA RX buffer ring is used. Because curr_y_count and |
470 | * curr_x_count can't be read as an atomic operation, | |
471 | * curr_y_count should be read before curr_x_count. When | |
472 | * curr_x_count is read, curr_y_count may already indicate | |
473 | * next buffer line. But, the position calculated here is | |
474 | * still indicate the old line. The wrong position data may | |
475 | * be smaller than current buffer tail, which cause garbages | |
476 | * are received if it is not prohibit. | |
477 | */ | |
56f5de8f SZ |
478 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); |
479 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); | |
480 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; | |
35ff6935 | 481 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0) |
56f5de8f SZ |
482 | uart->rx_dma_nrows = 0; |
483 | x_pos = DMA_RX_XCOUNT - x_pos; | |
194de561 BW |
484 | if (x_pos == DMA_RX_XCOUNT) |
485 | x_pos = 0; | |
486 | ||
487 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; | |
8516c568 SZ |
488 | /* Ignore receiving data if new position is in the same line of |
489 | * current buffer tail and small. | |
490 | */ | |
491 | if (pos > uart->rx_dma_buf.tail || | |
492 | uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) { | |
56f5de8f | 493 | uart->rx_dma_buf.head = pos; |
194de561 | 494 | bfin_serial_dma_rx_chars(uart); |
56f5de8f | 495 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; |
194de561 | 496 | } |
0aef4564 | 497 | |
9642dbe7 | 498 | spin_unlock_irqrestore(&uart->rx_lock, flags); |
1569039d | 499 | dma_enable_irq(uart->rx_dma_channel); |
68a784cb | 500 | |
0a278423 | 501 | mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES); |
194de561 BW |
502 | } |
503 | ||
504 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) | |
505 | { | |
506 | struct bfin_serial_port *uart = dev_id; | |
ebd2c8f6 | 507 | struct circ_buf *xmit = &uart->port.state->xmit; |
194de561 BW |
508 | |
509 | spin_lock(&uart->port.lock); | |
510 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { | |
194de561 | 511 | disable_dma(uart->tx_dma_channel); |
0711d857 | 512 | clear_dma_irqstat(uart->tx_dma_channel); |
0efa4f2c SZ |
513 | /* Anomaly notes: |
514 | * 05000215 - we always clear ETBEI within last UART TX | |
515 | * interrupt to end a string. It is always set | |
516 | * when start a new tx. | |
517 | */ | |
f4d640c9 | 518 | UART_CLEAR_IER(uart, ETBEI); |
0711d857 | 519 | uart->port.icount.tx += uart->tx_count; |
239c25b1 | 520 | if (!(xmit->tail == 0 && xmit->head == 0)) { |
60f4b002 | 521 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
1b73351c | 522 | |
60f4b002 SZ |
523 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
524 | uart_write_wakeup(&uart->port); | |
525 | } | |
56f5de8f | 526 | |
1b73351c | 527 | bfin_serial_dma_tx_chars(uart); |
194de561 BW |
528 | } |
529 | ||
530 | spin_unlock(&uart->port.lock); | |
531 | return IRQ_HANDLED; | |
532 | } | |
533 | ||
534 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) | |
535 | { | |
536 | struct bfin_serial_port *uart = dev_id; | |
3c2d0ed2 | 537 | unsigned int irqstat; |
35ff6935 | 538 | int x_pos, pos; |
0711d857 | 539 | |
0f66e50a | 540 | spin_lock(&uart->rx_lock); |
194de561 BW |
541 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); |
542 | clear_dma_irqstat(uart->rx_dma_channel); | |
8516c568 SZ |
543 | |
544 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); | |
35ff6935 | 545 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); |
8516c568 | 546 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; |
35ff6935 | 547 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0) |
8516c568 SZ |
548 | uart->rx_dma_nrows = 0; |
549 | ||
550 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT; | |
551 | if (pos > uart->rx_dma_buf.tail || | |
552 | uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) { | |
553 | uart->rx_dma_buf.head = pos; | |
554 | bfin_serial_dma_rx_chars(uart); | |
555 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; | |
556 | } | |
557 | ||
0f66e50a | 558 | spin_unlock(&uart->rx_lock); |
0aef4564 | 559 | |
194de561 BW |
560 | return IRQ_HANDLED; |
561 | } | |
562 | #endif | |
563 | ||
564 | /* | |
565 | * Return TIOCSER_TEMT when transmitter is not busy. | |
566 | */ | |
567 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) | |
568 | { | |
569 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
3c2d0ed2 | 570 | unsigned int lsr; |
194de561 BW |
571 | |
572 | lsr = UART_GET_LSR(uart); | |
573 | if (lsr & TEMT) | |
574 | return TIOCSER_TEMT; | |
575 | else | |
576 | return 0; | |
577 | } | |
578 | ||
194de561 BW |
579 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) |
580 | { | |
cf686762 | 581 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
59bd234b | 582 | u32 lcr = UART_GET_LCR(uart); |
cf686762 MF |
583 | if (break_state) |
584 | lcr |= SB; | |
585 | else | |
586 | lcr &= ~SB; | |
587 | UART_PUT_LCR(uart, lcr); | |
588 | SSYNC(); | |
194de561 BW |
589 | } |
590 | ||
591 | static int bfin_serial_startup(struct uart_port *port) | |
592 | { | |
593 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
594 | ||
595 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
596 | dma_addr_t dma_handle; | |
597 | ||
598 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { | |
599 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); | |
600 | return -EBUSY; | |
601 | } | |
602 | ||
603 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { | |
604 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); | |
605 | free_dma(uart->rx_dma_channel); | |
606 | return -EBUSY; | |
607 | } | |
608 | ||
609 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); | |
610 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); | |
611 | ||
612 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); | |
613 | uart->rx_dma_buf.head = 0; | |
614 | uart->rx_dma_buf.tail = 0; | |
615 | uart->rx_dma_nrows = 0; | |
616 | ||
617 | set_dma_config(uart->rx_dma_channel, | |
618 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, | |
619 | INTR_ON_ROW, DIMENSION_2D, | |
2047e40d MH |
620 | DATA_SIZE_8, |
621 | DMA_SYNC_RESTART)); | |
194de561 BW |
622 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); |
623 | set_dma_x_modify(uart->rx_dma_channel, 1); | |
624 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); | |
625 | set_dma_y_modify(uart->rx_dma_channel, 1); | |
626 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); | |
627 | enable_dma(uart->rx_dma_channel); | |
628 | ||
194de561 BW |
629 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; |
630 | add_timer(&(uart->rx_dma_timer)); | |
631 | #else | |
6f95570e | 632 | # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
52e15f0e SZ |
633 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) |
634 | if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled) | |
635 | kgdboc_break_enabled = 0; | |
636 | else { | |
637 | # endif | |
9cfb5c05 | 638 | if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0, |
a359cca7 | 639 | "BFIN_UART_RX", uart)) { |
194de561 BW |
640 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); |
641 | return -EBUSY; | |
642 | } | |
643 | ||
644 | if (request_irq | |
9cfb5c05 | 645 | (uart->tx_irq, bfin_serial_tx_int, 0, |
194de561 BW |
646 | "BFIN_UART_TX", uart)) { |
647 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); | |
47918f05 | 648 | free_irq(uart->rx_irq, uart); |
194de561 BW |
649 | return -EBUSY; |
650 | } | |
ab2375f2 SZ |
651 | |
652 | # ifdef CONFIG_BF54x | |
653 | { | |
b6100992 SZ |
654 | /* |
655 | * UART2 and UART3 on BF548 share interrupt PINs and DMA | |
656 | * controllers with SPORT2 and SPORT3. UART rx and tx | |
657 | * interrupts are generated in PIO mode only when configure | |
658 | * their peripheral mapping registers properly, which means | |
659 | * request corresponding DMA channels in PIO mode as well. | |
660 | */ | |
ab2375f2 SZ |
661 | unsigned uart_dma_ch_rx, uart_dma_ch_tx; |
662 | ||
47918f05 | 663 | switch (uart->rx_irq) { |
ab2375f2 SZ |
664 | case IRQ_UART3_RX: |
665 | uart_dma_ch_rx = CH_UART3_RX; | |
666 | uart_dma_ch_tx = CH_UART3_TX; | |
667 | break; | |
668 | case IRQ_UART2_RX: | |
669 | uart_dma_ch_rx = CH_UART2_RX; | |
670 | uart_dma_ch_tx = CH_UART2_TX; | |
671 | break; | |
672 | default: | |
673 | uart_dma_ch_rx = uart_dma_ch_tx = 0; | |
674 | break; | |
fc811472 | 675 | } |
ab2375f2 SZ |
676 | |
677 | if (uart_dma_ch_rx && | |
678 | request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) { | |
679 | printk(KERN_NOTICE"Fail to attach UART interrupt\n"); | |
47918f05 SZ |
680 | free_irq(uart->rx_irq, uart); |
681 | free_irq(uart->tx_irq, uart); | |
ab2375f2 SZ |
682 | return -EBUSY; |
683 | } | |
684 | if (uart_dma_ch_tx && | |
685 | request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) { | |
686 | printk(KERN_NOTICE "Fail to attach UART interrupt\n"); | |
687 | free_dma(uart_dma_ch_rx); | |
47918f05 SZ |
688 | free_irq(uart->rx_irq, uart); |
689 | free_irq(uart->tx_irq, uart); | |
ab2375f2 SZ |
690 | return -EBUSY; |
691 | } | |
692 | } | |
693 | # endif | |
6f95570e | 694 | # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \ |
52e15f0e SZ |
695 | defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE) |
696 | } | |
697 | # endif | |
6f95570e SZ |
698 | #endif |
699 | ||
60d0da51 | 700 | #ifdef SERIAL_BFIN_CTSRTS |
6f95570e SZ |
701 | if (uart->cts_pin >= 0) { |
702 | if (request_irq(gpio_to_irq(uart->cts_pin), | |
703 | bfin_serial_mctrl_cts_int, | |
704 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | | |
9cfb5c05 | 705 | 0, "BFIN_UART_CTS", uart)) { |
6f95570e | 706 | uart->cts_pin = -1; |
a89f2466 | 707 | pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n"); |
6f95570e SZ |
708 | } |
709 | } | |
32b44568 SZ |
710 | if (uart->rts_pin >= 0) { |
711 | if (gpio_request(uart->rts_pin, DRIVER_NAME)) { | |
712 | pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin); | |
713 | uart->rts_pin = -1; | |
714 | } else | |
715 | gpio_direction_output(uart->rts_pin, 0); | |
716 | } | |
194de561 | 717 | #endif |
60d0da51 | 718 | #ifdef SERIAL_BFIN_HARD_CTSRTS |
b48dc711 SZ |
719 | if (uart->cts_pin >= 0) { |
720 | if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int, | |
190c6cc3 | 721 | 0, "BFIN_UART_MODEM_STATUS", uart)) { |
b48dc711 SZ |
722 | uart->cts_pin = -1; |
723 | dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n"); | |
724 | } | |
d307d36a | 725 | |
b48dc711 | 726 | /* CTS RTS PINs are negative assertive. */ |
3c2d0ed2 | 727 | UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS); |
b48dc711 SZ |
728 | UART_SET_IER(uart, EDSSI); |
729 | } | |
d307d36a SZ |
730 | #endif |
731 | ||
f4d640c9 | 732 | UART_SET_IER(uart, ERBFI); |
194de561 BW |
733 | return 0; |
734 | } | |
735 | ||
736 | static void bfin_serial_shutdown(struct uart_port *port) | |
737 | { | |
738 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
739 | ||
740 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
741 | disable_dma(uart->tx_dma_channel); | |
742 | free_dma(uart->tx_dma_channel); | |
743 | disable_dma(uart->rx_dma_channel); | |
744 | free_dma(uart->rx_dma_channel); | |
745 | del_timer(&(uart->rx_dma_timer)); | |
75b780bd | 746 | dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0); |
194de561 | 747 | #else |
ab2375f2 SZ |
748 | #ifdef CONFIG_BF54x |
749 | switch (uart->port.irq) { | |
750 | case IRQ_UART3_RX: | |
751 | free_dma(CH_UART3_RX); | |
752 | free_dma(CH_UART3_TX); | |
753 | break; | |
754 | case IRQ_UART2_RX: | |
755 | free_dma(CH_UART2_RX); | |
756 | free_dma(CH_UART2_TX); | |
757 | break; | |
758 | default: | |
759 | break; | |
fc811472 | 760 | } |
474f1a66 | 761 | #endif |
47918f05 SZ |
762 | free_irq(uart->rx_irq, uart); |
763 | free_irq(uart->tx_irq, uart); | |
194de561 | 764 | #endif |
6f95570e | 765 | |
60d0da51 | 766 | #ifdef SERIAL_BFIN_CTSRTS |
6f95570e SZ |
767 | if (uart->cts_pin >= 0) |
768 | free_irq(gpio_to_irq(uart->cts_pin), uart); | |
32b44568 SZ |
769 | if (uart->rts_pin >= 0) |
770 | gpio_free(uart->rts_pin); | |
d307d36a | 771 | #endif |
60d0da51 | 772 | #ifdef SERIAL_BFIN_HARD_CTSRTS |
57afb399 | 773 | if (uart->cts_pin >= 0) |
d307d36a SZ |
774 | free_irq(uart->status_irq, uart); |
775 | #endif | |
194de561 BW |
776 | } |
777 | ||
778 | static void | |
779 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, | |
780 | struct ktermios *old) | |
781 | { | |
782 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
783 | unsigned long flags; | |
784 | unsigned int baud, quot; | |
3c2d0ed2 | 785 | unsigned int ier, lcr = 0; |
1cd3f2d2 | 786 | unsigned long timeout; |
194de561 | 787 | |
60d0da51 | 788 | #ifdef SERIAL_BFIN_CTSRTS |
8bd67d7d PH |
789 | if (old == NULL && uart->cts_pin != -1) |
790 | termios->c_cflag |= CRTSCTS; | |
791 | else if (uart->cts_pin == -1) | |
792 | termios->c_cflag &= ~CRTSCTS; | |
793 | #endif | |
794 | ||
194de561 BW |
795 | switch (termios->c_cflag & CSIZE) { |
796 | case CS8: | |
797 | lcr = WLS(8); | |
798 | break; | |
799 | case CS7: | |
800 | lcr = WLS(7); | |
801 | break; | |
802 | case CS6: | |
803 | lcr = WLS(6); | |
804 | break; | |
805 | case CS5: | |
806 | lcr = WLS(5); | |
807 | break; | |
808 | default: | |
46e99c4a | 809 | printk(KERN_ERR "%s: word length not supported\n", |
71cc2c21 | 810 | __func__); |
194de561 BW |
811 | } |
812 | ||
84507794 SZ |
813 | /* Anomaly notes: |
814 | * 05000231 - STOP bit is always set to 1 whatever the user is set. | |
815 | */ | |
816 | if (termios->c_cflag & CSTOPB) { | |
817 | if (ANOMALY_05000231) | |
818 | printk(KERN_WARNING "STOP bits other than 1 is not " | |
819 | "supported in case of anomaly 05000231.\n"); | |
820 | else | |
821 | lcr |= STB; | |
822 | } | |
19aa6382 | 823 | if (termios->c_cflag & PARENB) |
194de561 | 824 | lcr |= PEN; |
19aa6382 MF |
825 | if (!(termios->c_cflag & PARODD)) |
826 | lcr |= EPS; | |
827 | if (termios->c_cflag & CMSPAR) | |
828 | lcr |= STP; | |
194de561 | 829 | |
5bb06b62 SZ |
830 | spin_lock_irqsave(&uart->port.lock, flags); |
831 | ||
2ac5ee47 MF |
832 | port->read_status_mask = OE; |
833 | if (termios->c_iflag & INPCK) | |
834 | port->read_status_mask |= (FE | PE); | |
ef8b9ddc | 835 | if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
2ac5ee47 | 836 | port->read_status_mask |= BI; |
194de561 | 837 | |
2ac5ee47 MF |
838 | /* |
839 | * Characters to ignore | |
840 | */ | |
841 | port->ignore_status_mask = 0; | |
842 | if (termios->c_iflag & IGNPAR) | |
843 | port->ignore_status_mask |= FE | PE; | |
844 | if (termios->c_iflag & IGNBRK) { | |
845 | port->ignore_status_mask |= BI; | |
846 | /* | |
847 | * If we're ignoring parity and break indicators, | |
848 | * ignore overruns too (for real raw support). | |
849 | */ | |
850 | if (termios->c_iflag & IGNPAR) | |
851 | port->ignore_status_mask |= OE; | |
852 | } | |
194de561 BW |
853 | |
854 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
ca3e442e GY |
855 | quot = uart_get_divisor(port, baud); |
856 | ||
857 | /* If discipline is not IRDA, apply ANOMALY_05000230 */ | |
858 | if (termios->c_line != N_IRDA) | |
859 | quot -= ANOMALY_05000230; | |
860 | ||
8851c71e MF |
861 | UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15); |
862 | ||
1cd3f2d2 SZ |
863 | /* Wait till the transfer buffer is empty */ |
864 | timeout = jiffies + msecs_to_jiffies(10); | |
865 | while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT)) | |
866 | if (time_after(jiffies, timeout)) { | |
867 | dev_warn(port->dev, "timeout waiting for TX buffer empty\n"); | |
868 | break; | |
869 | } | |
870 | ||
194de561 BW |
871 | /* Disable UART */ |
872 | ier = UART_GET_IER(uart); | |
3c2d0ed2 | 873 | UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN); |
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 | 884 | |
3c2d0ed2 | 885 | UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr); |
194de561 BW |
886 | |
887 | /* Enable UART */ | |
1feaa51d | 888 | UART_ENABLE_INTS(uart, ier); |
3c2d0ed2 | 889 | UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN); |
194de561 | 890 | |
b3ef5aba GY |
891 | /* Port speed changed, update the per-port timeout. */ |
892 | uart_update_timeout(port, termios->c_cflag, baud); | |
893 | ||
194de561 BW |
894 | spin_unlock_irqrestore(&uart->port.lock, flags); |
895 | } | |
896 | ||
897 | static const char *bfin_serial_type(struct uart_port *port) | |
898 | { | |
899 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
900 | ||
901 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; | |
902 | } | |
903 | ||
904 | /* | |
905 | * Release the memory region(s) being used by 'port'. | |
906 | */ | |
907 | static void bfin_serial_release_port(struct uart_port *port) | |
908 | { | |
909 | } | |
910 | ||
911 | /* | |
912 | * Request the memory region(s) being used by 'port'. | |
913 | */ | |
914 | static int bfin_serial_request_port(struct uart_port *port) | |
915 | { | |
916 | return 0; | |
917 | } | |
918 | ||
919 | /* | |
920 | * Configure/autoconfigure the port. | |
921 | */ | |
922 | static void bfin_serial_config_port(struct uart_port *port, int flags) | |
923 | { | |
924 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
925 | ||
926 | if (flags & UART_CONFIG_TYPE && | |
927 | bfin_serial_request_port(&uart->port) == 0) | |
928 | uart->port.type = PORT_BFIN; | |
929 | } | |
930 | ||
931 | /* | |
932 | * Verify the new serial_struct (for TIOCSSERIAL). | |
933 | * The only change we allow are to the flags and type, and | |
934 | * even then only between PORT_BFIN and PORT_UNKNOWN | |
935 | */ | |
936 | static int | |
937 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
938 | { | |
939 | return 0; | |
940 | } | |
941 | ||
7d01b475 GY |
942 | /* |
943 | * Enable the IrDA function if tty->ldisc.num is N_IRDA. | |
944 | * In other cases, disable IrDA function. | |
945 | */ | |
732a84a0 PH |
946 | static void bfin_serial_set_ldisc(struct uart_port *port, |
947 | struct ktermios *termios) | |
7d01b475 | 948 | { |
57afb399 | 949 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
3c2d0ed2 | 950 | unsigned int val; |
7d01b475 | 951 | |
732a84a0 | 952 | switch (termios->c_line) { |
7d01b475 | 953 | case N_IRDA: |
57afb399 | 954 | val = UART_GET_GCTL(uart); |
b06d2f20 | 955 | val |= (UMOD_IRDA | RPOLC); |
57afb399 | 956 | UART_PUT_GCTL(uart, val); |
7d01b475 GY |
957 | break; |
958 | default: | |
57afb399 | 959 | val = UART_GET_GCTL(uart); |
b06d2f20 | 960 | val &= ~(UMOD_MASK | RPOLC); |
57afb399 | 961 | UART_PUT_GCTL(uart, val); |
7d01b475 GY |
962 | } |
963 | } | |
964 | ||
6f95570e SZ |
965 | static void bfin_serial_reset_irda(struct uart_port *port) |
966 | { | |
57afb399 | 967 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
3c2d0ed2 | 968 | unsigned int val; |
6f95570e | 969 | |
57afb399 | 970 | val = UART_GET_GCTL(uart); |
b06d2f20 | 971 | val &= ~(UMOD_MASK | RPOLC); |
57afb399 | 972 | UART_PUT_GCTL(uart, val); |
6f95570e | 973 | SSYNC(); |
b06d2f20 | 974 | val |= (UMOD_IRDA | RPOLC); |
57afb399 | 975 | UART_PUT_GCTL(uart, val); |
6f95570e SZ |
976 | SSYNC(); |
977 | } | |
978 | ||
52e15f0e | 979 | #ifdef CONFIG_CONSOLE_POLL |
0efa4f2c SZ |
980 | /* Anomaly notes: |
981 | * 05000099 - Because we only use THRE in poll_put and DR in poll_get, | |
982 | * losing other bits of UART_LSR is not a problem here. | |
983 | */ | |
52e15f0e SZ |
984 | static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr) |
985 | { | |
986 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
987 | ||
988 | while (!(UART_GET_LSR(uart) & THRE)) | |
989 | cpu_relax(); | |
990 | ||
991 | UART_CLEAR_DLAB(uart); | |
992 | UART_PUT_CHAR(uart, (unsigned char)chr); | |
993 | } | |
994 | ||
995 | static int bfin_serial_poll_get_char(struct uart_port *port) | |
996 | { | |
997 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
998 | unsigned char chr; | |
999 | ||
1000 | while (!(UART_GET_LSR(uart) & DR)) | |
1001 | cpu_relax(); | |
1002 | ||
1003 | UART_CLEAR_DLAB(uart); | |
1004 | chr = UART_GET_CHAR(uart); | |
1005 | ||
1006 | return chr; | |
1007 | } | |
1008 | #endif | |
1009 | ||
194de561 BW |
1010 | static struct uart_ops bfin_serial_pops = { |
1011 | .tx_empty = bfin_serial_tx_empty, | |
1012 | .set_mctrl = bfin_serial_set_mctrl, | |
1013 | .get_mctrl = bfin_serial_get_mctrl, | |
1014 | .stop_tx = bfin_serial_stop_tx, | |
1015 | .start_tx = bfin_serial_start_tx, | |
1016 | .stop_rx = bfin_serial_stop_rx, | |
194de561 BW |
1017 | .break_ctl = bfin_serial_break_ctl, |
1018 | .startup = bfin_serial_startup, | |
1019 | .shutdown = bfin_serial_shutdown, | |
1020 | .set_termios = bfin_serial_set_termios, | |
3b8458a9 | 1021 | .set_ldisc = bfin_serial_set_ldisc, |
194de561 BW |
1022 | .type = bfin_serial_type, |
1023 | .release_port = bfin_serial_release_port, | |
1024 | .request_port = bfin_serial_request_port, | |
1025 | .config_port = bfin_serial_config_port, | |
1026 | .verify_port = bfin_serial_verify_port, | |
52e15f0e SZ |
1027 | #ifdef CONFIG_CONSOLE_POLL |
1028 | .poll_put_char = bfin_serial_poll_put_char, | |
1029 | .poll_get_char = bfin_serial_poll_get_char, | |
1030 | #endif | |
194de561 BW |
1031 | }; |
1032 | ||
b6efa1ea | 1033 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK) |
194de561 BW |
1034 | /* |
1035 | * If the port was already initialised (eg, by a boot loader), | |
1036 | * try to determine the current setup. | |
1037 | */ | |
1038 | static void __init | |
1039 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, | |
1040 | int *parity, int *bits) | |
1041 | { | |
3c2d0ed2 | 1042 | unsigned int status; |
194de561 BW |
1043 | |
1044 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); | |
1045 | if (status == (ERBFI | ETBEI)) { | |
1046 | /* ok, the port was enabled */ | |
59bd234b | 1047 | u32 lcr, clk; |
194de561 BW |
1048 | |
1049 | lcr = UART_GET_LCR(uart); | |
1050 | ||
1051 | *parity = 'n'; | |
1052 | if (lcr & PEN) { | |
1053 | if (lcr & EPS) | |
1054 | *parity = 'e'; | |
1055 | else | |
1056 | *parity = 'o'; | |
1057 | } | |
59bd234b SZ |
1058 | *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5; |
1059 | ||
b06d2f20 | 1060 | /* Set DLAB in LCR to Access CLK */ |
45828b81 | 1061 | UART_SET_DLAB(uart); |
194de561 | 1062 | |
b06d2f20 | 1063 | clk = UART_GET_CLK(uart); |
194de561 BW |
1064 | |
1065 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
45828b81 | 1066 | UART_CLEAR_DLAB(uart); |
194de561 | 1067 | |
b06d2f20 | 1068 | *baud = get_sclk() / (16*clk); |
194de561 | 1069 | } |
71cc2c21 | 1070 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits); |
194de561 | 1071 | } |
0ae53640 | 1072 | |
0ae53640 | 1073 | static struct uart_driver bfin_serial_reg; |
194de561 | 1074 | |
57afb399 SZ |
1075 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) |
1076 | { | |
1077 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; | |
1078 | while (!(UART_GET_LSR(uart) & THRE)) | |
1079 | barrier(); | |
1080 | UART_PUT_CHAR(uart, ch); | |
1081 | } | |
1082 | ||
1083 | #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) || | |
1084 | defined (CONFIG_EARLY_PRINTK) */ | |
1085 | ||
1086 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
1087 | #define CLASS_BFIN_CONSOLE "bfin-console" | |
1088 | /* | |
1089 | * Interrupts are disabled on entering | |
1090 | */ | |
1091 | static void | |
1092 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) | |
1093 | { | |
1094 | struct bfin_serial_port *uart = bfin_serial_ports[co->index]; | |
1095 | unsigned long flags; | |
1096 | ||
1097 | spin_lock_irqsave(&uart->port.lock, flags); | |
1098 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); | |
1099 | spin_unlock_irqrestore(&uart->port.lock, flags); | |
1100 | ||
1101 | } | |
1102 | ||
194de561 BW |
1103 | static int __init |
1104 | bfin_serial_console_setup(struct console *co, char *options) | |
1105 | { | |
1106 | struct bfin_serial_port *uart; | |
1107 | int baud = 57600; | |
1108 | int bits = 8; | |
1109 | int parity = 'n'; | |
60d0da51 VR |
1110 | # if defined(SERIAL_BFIN_CTSRTS) || \ |
1111 | defined(SERIAL_BFIN_HARD_CTSRTS) | |
194de561 | 1112 | int flow = 'r'; |
b6efa1ea | 1113 | # else |
194de561 | 1114 | int flow = 'n'; |
0ae53640 | 1115 | # endif |
194de561 BW |
1116 | |
1117 | /* | |
1118 | * Check whether an invalid uart number has been specified, and | |
1119 | * if so, search for the first available port that does have | |
1120 | * console support. | |
1121 | */ | |
57afb399 SZ |
1122 | if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS) |
1123 | return -ENODEV; | |
1124 | ||
1125 | uart = bfin_serial_ports[co->index]; | |
1126 | if (!uart) | |
1127 | return -ENODEV; | |
194de561 BW |
1128 | |
1129 | if (options) | |
1130 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1131 | else | |
1132 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); | |
1133 | ||
1134 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); | |
0ae53640 | 1135 | } |
194de561 | 1136 | |
194de561 | 1137 | static struct console bfin_serial_console = { |
57afb399 | 1138 | .name = BFIN_SERIAL_DEV_NAME, |
194de561 BW |
1139 | .write = bfin_serial_console_write, |
1140 | .device = uart_console_device, | |
1141 | .setup = bfin_serial_console_setup, | |
1142 | .flags = CON_PRINTBUFFER, | |
1143 | .index = -1, | |
1144 | .data = &bfin_serial_reg, | |
1145 | }; | |
bb7e58f8 | 1146 | #define BFIN_SERIAL_CONSOLE (&bfin_serial_console) |
194de561 BW |
1147 | #else |
1148 | #define BFIN_SERIAL_CONSOLE NULL | |
0ae53640 RG |
1149 | #endif /* CONFIG_SERIAL_BFIN_CONSOLE */ |
1150 | ||
57afb399 SZ |
1151 | #ifdef CONFIG_EARLY_PRINTK |
1152 | static struct bfin_serial_port bfin_earlyprintk_port; | |
1153 | #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk" | |
0ae53640 | 1154 | |
57afb399 SZ |
1155 | /* |
1156 | * Interrupts are disabled on entering | |
1157 | */ | |
1158 | static void | |
1159 | bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count) | |
0ae53640 | 1160 | { |
57afb399 | 1161 | unsigned long flags; |
0ae53640 | 1162 | |
57afb399 SZ |
1163 | if (bfin_earlyprintk_port.port.line != co->index) |
1164 | return; | |
0ae53640 | 1165 | |
57afb399 SZ |
1166 | spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags); |
1167 | uart_console_write(&bfin_earlyprintk_port.port, s, count, | |
1168 | bfin_serial_console_putchar); | |
1169 | spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags); | |
0ae53640 RG |
1170 | } |
1171 | ||
7de7c55b RG |
1172 | /* |
1173 | * This should have a .setup or .early_setup in it, but then things get called | |
1174 | * without the command line options, and the baud rate gets messed up - so | |
1175 | * don't let the common infrastructure play with things. (see calls to setup | |
1176 | * & earlysetup in ./kernel/printk.c:register_console() | |
1177 | */ | |
6734a834 | 1178 | static struct console bfin_early_serial_console __initdata = { |
0ae53640 | 1179 | .name = "early_BFuart", |
57afb399 | 1180 | .write = bfin_earlyprintk_console_write, |
0ae53640 RG |
1181 | .device = uart_console_device, |
1182 | .flags = CON_PRINTBUFFER, | |
0ae53640 RG |
1183 | .index = -1, |
1184 | .data = &bfin_serial_reg, | |
1185 | }; | |
6d9e4498 SZ |
1186 | #endif |
1187 | ||
194de561 BW |
1188 | static struct uart_driver bfin_serial_reg = { |
1189 | .owner = THIS_MODULE, | |
57afb399 SZ |
1190 | .driver_name = DRIVER_NAME, |
1191 | .dev_name = BFIN_SERIAL_DEV_NAME, | |
194de561 BW |
1192 | .major = BFIN_SERIAL_MAJOR, |
1193 | .minor = BFIN_SERIAL_MINOR, | |
2ade9729 | 1194 | .nr = BFIN_UART_NR_PORTS, |
194de561 BW |
1195 | .cons = BFIN_SERIAL_CONSOLE, |
1196 | }; | |
1197 | ||
57afb399 | 1198 | static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state) |
194de561 | 1199 | { |
57afb399 | 1200 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); |
194de561 | 1201 | |
57afb399 SZ |
1202 | return uart_suspend_port(&bfin_serial_reg, &uart->port); |
1203 | } | |
194de561 | 1204 | |
57afb399 SZ |
1205 | static int bfin_serial_resume(struct platform_device *pdev) |
1206 | { | |
1207 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); | |
1208 | ||
1209 | return uart_resume_port(&bfin_serial_reg, &uart->port); | |
194de561 BW |
1210 | } |
1211 | ||
57afb399 | 1212 | static int bfin_serial_probe(struct platform_device *pdev) |
194de561 | 1213 | { |
57afb399 SZ |
1214 | struct resource *res; |
1215 | struct bfin_serial_port *uart = NULL; | |
1216 | int ret = 0; | |
194de561 | 1217 | |
57afb399 SZ |
1218 | if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) { |
1219 | dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n"); | |
1220 | return -ENOENT; | |
ccfbc3e1 | 1221 | } |
194de561 | 1222 | |
57afb399 | 1223 | if (bfin_serial_ports[pdev->id] == NULL) { |
194de561 | 1224 | |
57afb399 SZ |
1225 | uart = kzalloc(sizeof(*uart), GFP_KERNEL); |
1226 | if (!uart) { | |
1227 | dev_err(&pdev->dev, | |
1228 | "fail to malloc bfin_serial_port\n"); | |
1229 | return -ENOMEM; | |
1230 | } | |
1231 | bfin_serial_ports[pdev->id] = uart; | |
194de561 | 1232 | |
57afb399 SZ |
1233 | #ifdef CONFIG_EARLY_PRINTK |
1234 | if (!(bfin_earlyprintk_port.port.membase | |
1235 | && bfin_earlyprintk_port.port.line == pdev->id)) { | |
1236 | /* | |
1237 | * If the peripheral PINs of current port is allocated | |
1238 | * in earlyprintk probe stage, don't do it again. | |
1239 | */ | |
1240 | #endif | |
1241 | ret = peripheral_request_list( | |
0e03e3f8 | 1242 | dev_get_platdata(&pdev->dev), |
574de559 | 1243 | DRIVER_NAME); |
57afb399 SZ |
1244 | if (ret) { |
1245 | dev_err(&pdev->dev, | |
1246 | "fail to request bfin serial peripherals\n"); | |
1247 | goto out_error_free_mem; | |
1248 | } | |
1249 | #ifdef CONFIG_EARLY_PRINTK | |
1250 | } | |
1251 | #endif | |
1252 | ||
1253 | spin_lock_init(&uart->port.lock); | |
1254 | uart->port.uartclk = get_sclk(); | |
1255 | uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE; | |
1256 | uart->port.ops = &bfin_serial_pops; | |
1257 | uart->port.line = pdev->id; | |
1258 | uart->port.iotype = UPIO_MEM; | |
1259 | uart->port.flags = UPF_BOOT_AUTOCONF; | |
1260 | ||
1261 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1262 | if (res == NULL) { | |
1263 | dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); | |
1264 | ret = -ENOENT; | |
1265 | goto out_error_free_peripherals; | |
1266 | } | |
1267 | ||
28f65c11 | 1268 | uart->port.membase = ioremap(res->start, resource_size(res)); |
57afb399 SZ |
1269 | if (!uart->port.membase) { |
1270 | dev_err(&pdev->dev, "Cannot map uart IO\n"); | |
1271 | ret = -ENXIO; | |
1272 | goto out_error_free_peripherals; | |
1273 | } | |
1274 | uart->port.mapbase = res->start; | |
194de561 | 1275 | |
47918f05 SZ |
1276 | uart->tx_irq = platform_get_irq(pdev, 0); |
1277 | if (uart->tx_irq < 0) { | |
1278 | dev_err(&pdev->dev, "No uart TX IRQ specified\n"); | |
57afb399 SZ |
1279 | ret = -ENOENT; |
1280 | goto out_error_unmap; | |
194de561 | 1281 | } |
57afb399 | 1282 | |
47918f05 SZ |
1283 | uart->rx_irq = platform_get_irq(pdev, 1); |
1284 | if (uart->rx_irq < 0) { | |
1285 | dev_err(&pdev->dev, "No uart RX IRQ specified\n"); | |
1286 | ret = -ENOENT; | |
1287 | goto out_error_unmap; | |
1288 | } | |
1289 | uart->port.irq = uart->rx_irq; | |
1290 | ||
1291 | uart->status_irq = platform_get_irq(pdev, 2); | |
57afb399 SZ |
1292 | if (uart->status_irq < 0) { |
1293 | dev_err(&pdev->dev, "No uart status IRQ specified\n"); | |
1294 | ret = -ENOENT; | |
1295 | goto out_error_unmap; | |
1296 | } | |
1297 | ||
1298 | #ifdef CONFIG_SERIAL_BFIN_DMA | |
0f66e50a | 1299 | spin_lock_init(&uart->rx_lock); |
57afb399 SZ |
1300 | uart->tx_done = 1; |
1301 | uart->tx_count = 0; | |
1302 | ||
1303 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
1304 | if (res == NULL) { | |
1305 | dev_err(&pdev->dev, "No uart TX DMA channel specified\n"); | |
1306 | ret = -ENOENT; | |
1307 | goto out_error_unmap; | |
1308 | } | |
1309 | uart->tx_dma_channel = res->start; | |
1310 | ||
1311 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
1312 | if (res == NULL) { | |
1313 | dev_err(&pdev->dev, "No uart RX DMA channel specified\n"); | |
1314 | ret = -ENOENT; | |
1315 | goto out_error_unmap; | |
1316 | } | |
1317 | uart->rx_dma_channel = res->start; | |
1318 | ||
1209a813 | 1319 | timer_setup(&uart->rx_dma_timer, bfin_serial_rx_dma_timeout, 0); |
57afb399 SZ |
1320 | #endif |
1321 | ||
60d0da51 VR |
1322 | #if defined(SERIAL_BFIN_CTSRTS) || \ |
1323 | defined(SERIAL_BFIN_HARD_CTSRTS) | |
57afb399 SZ |
1324 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
1325 | if (res == NULL) | |
1326 | uart->cts_pin = -1; | |
8bd67d7d | 1327 | else |
57afb399 SZ |
1328 | uart->cts_pin = res->start; |
1329 | ||
1330 | res = platform_get_resource(pdev, IORESOURCE_IO, 1); | |
1331 | if (res == NULL) | |
1332 | uart->rts_pin = -1; | |
1333 | else | |
1334 | uart->rts_pin = res->start; | |
57afb399 | 1335 | #endif |
194de561 BW |
1336 | } |
1337 | ||
57afb399 SZ |
1338 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE |
1339 | if (!is_early_platform_device(pdev)) { | |
1340 | #endif | |
1341 | uart = bfin_serial_ports[pdev->id]; | |
1342 | uart->port.dev = &pdev->dev; | |
1343 | dev_set_drvdata(&pdev->dev, uart); | |
1344 | ret = uart_add_one_port(&bfin_serial_reg, &uart->port); | |
1345 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
1346 | } | |
1347 | #endif | |
1348 | ||
1349 | if (!ret) | |
1350 | return 0; | |
1351 | ||
1352 | if (uart) { | |
1353 | out_error_unmap: | |
1354 | iounmap(uart->port.membase); | |
1355 | out_error_free_peripherals: | |
0e03e3f8 | 1356 | peripheral_free_list(dev_get_platdata(&pdev->dev)); |
57afb399 SZ |
1357 | out_error_free_mem: |
1358 | kfree(uart); | |
1359 | bfin_serial_ports[pdev->id] = NULL; | |
1360 | } | |
1361 | ||
1362 | return ret; | |
194de561 BW |
1363 | } |
1364 | ||
ae8d8a14 | 1365 | static int bfin_serial_remove(struct platform_device *pdev) |
194de561 | 1366 | { |
57afb399 SZ |
1367 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); |
1368 | ||
1369 | dev_set_drvdata(&pdev->dev, NULL); | |
1370 | ||
1371 | if (uart) { | |
1372 | uart_remove_one_port(&bfin_serial_reg, &uart->port); | |
57afb399 | 1373 | iounmap(uart->port.membase); |
0e03e3f8 | 1374 | peripheral_free_list(dev_get_platdata(&pdev->dev)); |
57afb399 SZ |
1375 | kfree(uart); |
1376 | bfin_serial_ports[pdev->id] = NULL; | |
ccfbc3e1 | 1377 | } |
194de561 BW |
1378 | |
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | static struct platform_driver bfin_serial_driver = { | |
1383 | .probe = bfin_serial_probe, | |
2d47b716 | 1384 | .remove = bfin_serial_remove, |
194de561 BW |
1385 | .suspend = bfin_serial_suspend, |
1386 | .resume = bfin_serial_resume, | |
1387 | .driver = { | |
57afb399 | 1388 | .name = DRIVER_NAME, |
194de561 BW |
1389 | }, |
1390 | }; | |
1391 | ||
57afb399 | 1392 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) |
6734a834 | 1393 | static struct early_platform_driver early_bfin_serial_driver __initdata = { |
57afb399 SZ |
1394 | .class_str = CLASS_BFIN_CONSOLE, |
1395 | .pdrv = &bfin_serial_driver, | |
1396 | .requested_id = EARLY_PLATFORM_ID_UNSET, | |
1397 | }; | |
1398 | ||
1399 | static int __init bfin_serial_rs_console_init(void) | |
1400 | { | |
1401 | early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME); | |
1402 | ||
1403 | early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0); | |
1404 | ||
1405 | register_console(&bfin_serial_console); | |
1406 | ||
1407 | return 0; | |
1408 | } | |
1409 | console_initcall(bfin_serial_rs_console_init); | |
1410 | #endif | |
1411 | ||
1412 | #ifdef CONFIG_EARLY_PRINTK | |
1413 | /* | |
1414 | * Memory can't be allocated dynamically during earlyprink init stage. | |
1415 | * So, do individual probe for earlyprink with a static uart port variable. | |
1416 | */ | |
1417 | static int bfin_earlyprintk_probe(struct platform_device *pdev) | |
194de561 | 1418 | { |
57afb399 | 1419 | struct resource *res; |
194de561 BW |
1420 | int ret; |
1421 | ||
57afb399 SZ |
1422 | if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) { |
1423 | dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n"); | |
1424 | return -ENOENT; | |
1425 | } | |
1426 | ||
0e03e3f8 JH |
1427 | ret = peripheral_request_list(dev_get_platdata(&pdev->dev), |
1428 | DRIVER_NAME); | |
57afb399 SZ |
1429 | if (ret) { |
1430 | dev_err(&pdev->dev, | |
1431 | "fail to request bfin serial peripherals\n"); | |
1432 | return ret; | |
1433 | } | |
1434 | ||
1435 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1436 | if (res == NULL) { | |
1437 | dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); | |
1438 | ret = -ENOENT; | |
1439 | goto out_error_free_peripherals; | |
1440 | } | |
1441 | ||
1442 | bfin_earlyprintk_port.port.membase = ioremap(res->start, | |
28f65c11 | 1443 | resource_size(res)); |
57afb399 SZ |
1444 | if (!bfin_earlyprintk_port.port.membase) { |
1445 | dev_err(&pdev->dev, "Cannot map uart IO\n"); | |
1446 | ret = -ENXIO; | |
1447 | goto out_error_free_peripherals; | |
1448 | } | |
1449 | bfin_earlyprintk_port.port.mapbase = res->start; | |
1450 | bfin_earlyprintk_port.port.line = pdev->id; | |
1451 | bfin_earlyprintk_port.port.uartclk = get_sclk(); | |
1452 | bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE; | |
1453 | spin_lock_init(&bfin_earlyprintk_port.port.lock); | |
1454 | ||
1455 | return 0; | |
1456 | ||
1457 | out_error_free_peripherals: | |
0e03e3f8 | 1458 | peripheral_free_list(dev_get_platdata(&pdev->dev)); |
57afb399 SZ |
1459 | |
1460 | return ret; | |
1461 | } | |
1462 | ||
1463 | static struct platform_driver bfin_earlyprintk_driver = { | |
1464 | .probe = bfin_earlyprintk_probe, | |
1465 | .driver = { | |
1466 | .name = DRIVER_NAME, | |
1467 | .owner = THIS_MODULE, | |
1468 | }, | |
1469 | }; | |
1470 | ||
6734a834 | 1471 | static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = { |
57afb399 SZ |
1472 | .class_str = CLASS_BFIN_EARLYPRINTK, |
1473 | .pdrv = &bfin_earlyprintk_driver, | |
1474 | .requested_id = EARLY_PLATFORM_ID_UNSET, | |
1475 | }; | |
1476 | ||
1477 | struct console __init *bfin_earlyserial_init(unsigned int port, | |
1478 | unsigned int cflag) | |
1479 | { | |
1480 | struct ktermios t; | |
1481 | char port_name[20]; | |
194de561 | 1482 | |
57afb399 SZ |
1483 | if (port < 0 || port >= BFIN_UART_NR_PORTS) |
1484 | return NULL; | |
1485 | ||
1486 | /* | |
1487 | * Only probe resource of the given port in earlyprintk boot arg. | |
1488 | * The expected port id should be indicated in port name string. | |
1489 | */ | |
1490 | snprintf(port_name, 20, DRIVER_NAME ".%d", port); | |
1491 | early_platform_driver_register(&early_bfin_earlyprintk_driver, | |
1492 | port_name); | |
1493 | early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0); | |
1494 | ||
1495 | if (!bfin_earlyprintk_port.port.membase) | |
1496 | return NULL; | |
1497 | ||
1498 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE | |
1499 | /* | |
1500 | * If we are using early serial, don't let the normal console rewind | |
1501 | * log buffer, since that causes things to be printed multiple times | |
1502 | */ | |
1503 | bfin_serial_console.flags &= ~CON_PRINTBUFFER; | |
1504 | #endif | |
1505 | ||
1506 | bfin_early_serial_console.index = port; | |
1507 | t.c_cflag = cflag; | |
1508 | t.c_iflag = 0; | |
1509 | t.c_oflag = 0; | |
1510 | t.c_lflag = ICANON; | |
1511 | t.c_line = port; | |
1512 | bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t); | |
1513 | ||
1514 | return &bfin_early_serial_console; | |
1515 | } | |
1516 | #endif /* CONFIG_EARLY_PRINTK */ | |
1517 | ||
1518 | static int __init bfin_serial_init(void) | |
1519 | { | |
1520 | int ret; | |
1521 | ||
1522 | pr_info("Blackfin serial driver\n"); | |
194de561 BW |
1523 | |
1524 | ret = uart_register_driver(&bfin_serial_reg); | |
57afb399 SZ |
1525 | if (ret) { |
1526 | pr_err("failed to register %s:%d\n", | |
1527 | bfin_serial_reg.driver_name, ret); | |
1528 | } | |
1529 | ||
1530 | ret = platform_driver_register(&bfin_serial_driver); | |
1531 | if (ret) { | |
1532 | pr_err("fail to register bfin uart\n"); | |
1533 | uart_unregister_driver(&bfin_serial_reg); | |
194de561 | 1534 | } |
57afb399 | 1535 | |
194de561 BW |
1536 | return ret; |
1537 | } | |
1538 | ||
1539 | static void __exit bfin_serial_exit(void) | |
1540 | { | |
1541 | platform_driver_unregister(&bfin_serial_driver); | |
1542 | uart_unregister_driver(&bfin_serial_reg); | |
1543 | } | |
1544 | ||
52e15f0e | 1545 | |
194de561 BW |
1546 | module_init(bfin_serial_init); |
1547 | module_exit(bfin_serial_exit); | |
1548 | ||
57afb399 | 1549 | MODULE_AUTHOR("Sonic Zhang, Aubrey Li"); |
194de561 BW |
1550 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); |
1551 | MODULE_LICENSE("GPL"); | |
1552 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); | |
e169c139 | 1553 | MODULE_ALIAS("platform:bfin-uart"); |