Commit | Line | Data |
---|---|---|
2f0fc415 JC |
1 | /* |
2 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published | |
6 | * by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | * | |
17 | * Copyright (C) 2004 Infineon IFAP DC COM CPE | |
18 | * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> | |
19 | * Copyright (C) 2007 John Crispin <blogic@openwrt.org> | |
20 | * Copyright (C) 2010 Thomas Langer, <thomas.langer@lantiq.com> | |
21 | */ | |
22 | ||
23 | #include <linux/slab.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/console.h> | |
28 | #include <linux/sysrq.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/tty.h> | |
31 | #include <linux/tty_flip.h> | |
32 | #include <linux/serial_core.h> | |
33 | #include <linux/serial.h> | |
34 | #include <linux/platform_device.h> | |
35 | #include <linux/io.h> | |
36 | #include <linux/clk.h> | |
37 | ||
38 | #include <lantiq_soc.h> | |
39 | ||
40 | #define PORT_LTQ_ASC 111 | |
41 | #define MAXPORTS 2 | |
42 | #define UART_DUMMY_UER_RX 1 | |
43 | #define DRVNAME "ltq_asc" | |
44 | #ifdef __BIG_ENDIAN | |
45 | #define LTQ_ASC_TBUF (0x0020 + 3) | |
46 | #define LTQ_ASC_RBUF (0x0024 + 3) | |
47 | #else | |
48 | #define LTQ_ASC_TBUF 0x0020 | |
49 | #define LTQ_ASC_RBUF 0x0024 | |
50 | #endif | |
51 | #define LTQ_ASC_FSTAT 0x0048 | |
52 | #define LTQ_ASC_WHBSTATE 0x0018 | |
53 | #define LTQ_ASC_STATE 0x0014 | |
54 | #define LTQ_ASC_IRNCR 0x00F8 | |
55 | #define LTQ_ASC_CLC 0x0000 | |
56 | #define LTQ_ASC_ID 0x0008 | |
57 | #define LTQ_ASC_PISEL 0x0004 | |
58 | #define LTQ_ASC_TXFCON 0x0044 | |
59 | #define LTQ_ASC_RXFCON 0x0040 | |
60 | #define LTQ_ASC_CON 0x0010 | |
61 | #define LTQ_ASC_BG 0x0050 | |
62 | #define LTQ_ASC_IRNREN 0x00F4 | |
63 | ||
64 | #define ASC_IRNREN_TX 0x1 | |
65 | #define ASC_IRNREN_RX 0x2 | |
66 | #define ASC_IRNREN_ERR 0x4 | |
67 | #define ASC_IRNREN_TX_BUF 0x8 | |
68 | #define ASC_IRNCR_TIR 0x1 | |
69 | #define ASC_IRNCR_RIR 0x2 | |
70 | #define ASC_IRNCR_EIR 0x4 | |
71 | ||
72 | #define ASCOPT_CSIZE 0x3 | |
73 | #define TXFIFO_FL 1 | |
74 | #define RXFIFO_FL 1 | |
75 | #define ASCCLC_DISS 0x2 | |
76 | #define ASCCLC_RMCMASK 0x0000FF00 | |
77 | #define ASCCLC_RMCOFFSET 8 | |
78 | #define ASCCON_M_8ASYNC 0x0 | |
79 | #define ASCCON_M_7ASYNC 0x2 | |
80 | #define ASCCON_ODD 0x00000020 | |
81 | #define ASCCON_STP 0x00000080 | |
82 | #define ASCCON_BRS 0x00000100 | |
83 | #define ASCCON_FDE 0x00000200 | |
84 | #define ASCCON_R 0x00008000 | |
85 | #define ASCCON_FEN 0x00020000 | |
86 | #define ASCCON_ROEN 0x00080000 | |
87 | #define ASCCON_TOEN 0x00100000 | |
88 | #define ASCSTATE_PE 0x00010000 | |
89 | #define ASCSTATE_FE 0x00020000 | |
90 | #define ASCSTATE_ROE 0x00080000 | |
91 | #define ASCSTATE_ANY (ASCSTATE_ROE|ASCSTATE_PE|ASCSTATE_FE) | |
92 | #define ASCWHBSTATE_CLRREN 0x00000001 | |
93 | #define ASCWHBSTATE_SETREN 0x00000002 | |
94 | #define ASCWHBSTATE_CLRPE 0x00000004 | |
95 | #define ASCWHBSTATE_CLRFE 0x00000008 | |
96 | #define ASCWHBSTATE_CLRROE 0x00000020 | |
97 | #define ASCTXFCON_TXFEN 0x0001 | |
98 | #define ASCTXFCON_TXFFLU 0x0002 | |
99 | #define ASCTXFCON_TXFITLMASK 0x3F00 | |
100 | #define ASCTXFCON_TXFITLOFF 8 | |
101 | #define ASCRXFCON_RXFEN 0x0001 | |
102 | #define ASCRXFCON_RXFFLU 0x0002 | |
103 | #define ASCRXFCON_RXFITLMASK 0x3F00 | |
104 | #define ASCRXFCON_RXFITLOFF 8 | |
105 | #define ASCFSTAT_RXFFLMASK 0x003F | |
106 | #define ASCFSTAT_TXFFLMASK 0x3F00 | |
107 | #define ASCFSTAT_TXFREEMASK 0x3F000000 | |
108 | #define ASCFSTAT_TXFREEOFF 24 | |
109 | ||
110 | static void lqasc_tx_chars(struct uart_port *port); | |
111 | static struct ltq_uart_port *lqasc_port[MAXPORTS]; | |
112 | static struct uart_driver lqasc_reg; | |
113 | static DEFINE_SPINLOCK(ltq_asc_lock); | |
114 | ||
115 | struct ltq_uart_port { | |
116 | struct uart_port port; | |
117 | struct clk *clk; | |
118 | unsigned int tx_irq; | |
119 | unsigned int rx_irq; | |
120 | unsigned int err_irq; | |
121 | }; | |
122 | ||
123 | static inline struct | |
124 | ltq_uart_port *to_ltq_uart_port(struct uart_port *port) | |
125 | { | |
126 | return container_of(port, struct ltq_uart_port, port); | |
127 | } | |
128 | ||
129 | static void | |
130 | lqasc_stop_tx(struct uart_port *port) | |
131 | { | |
132 | return; | |
133 | } | |
134 | ||
135 | static void | |
136 | lqasc_start_tx(struct uart_port *port) | |
137 | { | |
138 | unsigned long flags; | |
139 | spin_lock_irqsave(<q_asc_lock, flags); | |
140 | lqasc_tx_chars(port); | |
141 | spin_unlock_irqrestore(<q_asc_lock, flags); | |
142 | return; | |
143 | } | |
144 | ||
145 | static void | |
146 | lqasc_stop_rx(struct uart_port *port) | |
147 | { | |
148 | ltq_w32(ASCWHBSTATE_CLRREN, port->membase + LTQ_ASC_WHBSTATE); | |
149 | } | |
150 | ||
151 | static void | |
152 | lqasc_enable_ms(struct uart_port *port) | |
153 | { | |
154 | } | |
155 | ||
156 | static int | |
157 | lqasc_rx_chars(struct uart_port *port) | |
158 | { | |
159 | struct tty_struct *tty = tty_port_tty_get(&port->state->port); | |
160 | unsigned int ch = 0, rsr = 0, fifocnt; | |
161 | ||
162 | if (!tty) { | |
163 | dev_dbg(port->dev, "%s:tty is busy now", __func__); | |
164 | return -EBUSY; | |
165 | } | |
166 | fifocnt = | |
167 | ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK; | |
168 | while (fifocnt--) { | |
169 | u8 flag = TTY_NORMAL; | |
170 | ch = ltq_r8(port->membase + LTQ_ASC_RBUF); | |
171 | rsr = (ltq_r32(port->membase + LTQ_ASC_STATE) | |
172 | & ASCSTATE_ANY) | UART_DUMMY_UER_RX; | |
173 | tty_flip_buffer_push(tty); | |
174 | port->icount.rx++; | |
175 | ||
176 | /* | |
177 | * Note that the error handling code is | |
178 | * out of the main execution path | |
179 | */ | |
180 | if (rsr & ASCSTATE_ANY) { | |
181 | if (rsr & ASCSTATE_PE) { | |
182 | port->icount.parity++; | |
183 | ltq_w32_mask(0, ASCWHBSTATE_CLRPE, | |
184 | port->membase + LTQ_ASC_WHBSTATE); | |
185 | } else if (rsr & ASCSTATE_FE) { | |
186 | port->icount.frame++; | |
187 | ltq_w32_mask(0, ASCWHBSTATE_CLRFE, | |
188 | port->membase + LTQ_ASC_WHBSTATE); | |
189 | } | |
190 | if (rsr & ASCSTATE_ROE) { | |
191 | port->icount.overrun++; | |
192 | ltq_w32_mask(0, ASCWHBSTATE_CLRROE, | |
193 | port->membase + LTQ_ASC_WHBSTATE); | |
194 | } | |
195 | ||
196 | rsr &= port->read_status_mask; | |
197 | ||
198 | if (rsr & ASCSTATE_PE) | |
199 | flag = TTY_PARITY; | |
200 | else if (rsr & ASCSTATE_FE) | |
201 | flag = TTY_FRAME; | |
202 | } | |
203 | ||
204 | if ((rsr & port->ignore_status_mask) == 0) | |
205 | tty_insert_flip_char(tty, ch, flag); | |
206 | ||
207 | if (rsr & ASCSTATE_ROE) | |
208 | /* | |
209 | * Overrun is special, since it's reported | |
210 | * immediately, and doesn't affect the current | |
211 | * character | |
212 | */ | |
213 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
214 | } | |
215 | if (ch != 0) | |
216 | tty_flip_buffer_push(tty); | |
217 | tty_kref_put(tty); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static void | |
222 | lqasc_tx_chars(struct uart_port *port) | |
223 | { | |
224 | struct circ_buf *xmit = &port->state->xmit; | |
225 | if (uart_tx_stopped(port)) { | |
226 | lqasc_stop_tx(port); | |
227 | return; | |
228 | } | |
229 | ||
230 | while (((ltq_r32(port->membase + LTQ_ASC_FSTAT) & | |
231 | ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF) != 0) { | |
232 | if (port->x_char) { | |
233 | ltq_w8(port->x_char, port->membase + LTQ_ASC_TBUF); | |
234 | port->icount.tx++; | |
235 | port->x_char = 0; | |
236 | continue; | |
237 | } | |
238 | ||
239 | if (uart_circ_empty(xmit)) | |
240 | break; | |
241 | ||
242 | ltq_w8(port->state->xmit.buf[port->state->xmit.tail], | |
243 | port->membase + LTQ_ASC_TBUF); | |
244 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
245 | port->icount.tx++; | |
246 | } | |
247 | ||
248 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
249 | uart_write_wakeup(port); | |
250 | } | |
251 | ||
252 | static irqreturn_t | |
253 | lqasc_tx_int(int irq, void *_port) | |
254 | { | |
255 | unsigned long flags; | |
256 | struct uart_port *port = (struct uart_port *)_port; | |
257 | spin_lock_irqsave(<q_asc_lock, flags); | |
258 | ltq_w32(ASC_IRNCR_TIR, port->membase + LTQ_ASC_IRNCR); | |
259 | spin_unlock_irqrestore(<q_asc_lock, flags); | |
260 | lqasc_start_tx(port); | |
261 | return IRQ_HANDLED; | |
262 | } | |
263 | ||
264 | static irqreturn_t | |
265 | lqasc_err_int(int irq, void *_port) | |
266 | { | |
267 | unsigned long flags; | |
268 | struct uart_port *port = (struct uart_port *)_port; | |
269 | spin_lock_irqsave(<q_asc_lock, flags); | |
270 | /* clear any pending interrupts */ | |
271 | ltq_w32_mask(0, ASCWHBSTATE_CLRPE | ASCWHBSTATE_CLRFE | | |
272 | ASCWHBSTATE_CLRROE, port->membase + LTQ_ASC_WHBSTATE); | |
273 | spin_unlock_irqrestore(<q_asc_lock, flags); | |
274 | return IRQ_HANDLED; | |
275 | } | |
276 | ||
277 | static irqreturn_t | |
278 | lqasc_rx_int(int irq, void *_port) | |
279 | { | |
280 | unsigned long flags; | |
281 | struct uart_port *port = (struct uart_port *)_port; | |
282 | spin_lock_irqsave(<q_asc_lock, flags); | |
283 | ltq_w32(ASC_IRNCR_RIR, port->membase + LTQ_ASC_IRNCR); | |
284 | lqasc_rx_chars(port); | |
285 | spin_unlock_irqrestore(<q_asc_lock, flags); | |
286 | return IRQ_HANDLED; | |
287 | } | |
288 | ||
289 | static unsigned int | |
290 | lqasc_tx_empty(struct uart_port *port) | |
291 | { | |
292 | int status; | |
293 | status = ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_TXFFLMASK; | |
294 | return status ? 0 : TIOCSER_TEMT; | |
295 | } | |
296 | ||
297 | static unsigned int | |
298 | lqasc_get_mctrl(struct uart_port *port) | |
299 | { | |
300 | return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR; | |
301 | } | |
302 | ||
303 | static void | |
304 | lqasc_set_mctrl(struct uart_port *port, u_int mctrl) | |
305 | { | |
306 | } | |
307 | ||
308 | static void | |
309 | lqasc_break_ctl(struct uart_port *port, int break_state) | |
310 | { | |
311 | } | |
312 | ||
313 | static int | |
314 | lqasc_startup(struct uart_port *port) | |
315 | { | |
316 | struct ltq_uart_port *ltq_port = to_ltq_uart_port(port); | |
317 | int retval; | |
318 | ||
319 | port->uartclk = clk_get_rate(ltq_port->clk); | |
320 | ||
321 | ltq_w32_mask(ASCCLC_DISS | ASCCLC_RMCMASK, (1 << ASCCLC_RMCOFFSET), | |
322 | port->membase + LTQ_ASC_CLC); | |
323 | ||
324 | ltq_w32(0, port->membase + LTQ_ASC_PISEL); | |
325 | ltq_w32( | |
326 | ((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) | | |
327 | ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU, | |
328 | port->membase + LTQ_ASC_TXFCON); | |
329 | ltq_w32( | |
330 | ((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK) | |
331 | | ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU, | |
332 | port->membase + LTQ_ASC_RXFCON); | |
333 | /* make sure other settings are written to hardware before | |
334 | * setting enable bits | |
335 | */ | |
336 | wmb(); | |
337 | ltq_w32_mask(0, ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN | | |
338 | ASCCON_ROEN, port->membase + LTQ_ASC_CON); | |
339 | ||
340 | retval = request_irq(ltq_port->tx_irq, lqasc_tx_int, | |
341 | IRQF_DISABLED, "asc_tx", port); | |
342 | if (retval) { | |
343 | pr_err("failed to request lqasc_tx_int\n"); | |
344 | return retval; | |
345 | } | |
346 | ||
347 | retval = request_irq(ltq_port->rx_irq, lqasc_rx_int, | |
348 | IRQF_DISABLED, "asc_rx", port); | |
349 | if (retval) { | |
350 | pr_err("failed to request lqasc_rx_int\n"); | |
351 | goto err1; | |
352 | } | |
353 | ||
354 | retval = request_irq(ltq_port->err_irq, lqasc_err_int, | |
355 | IRQF_DISABLED, "asc_err", port); | |
356 | if (retval) { | |
357 | pr_err("failed to request lqasc_err_int\n"); | |
358 | goto err2; | |
359 | } | |
360 | ||
361 | ltq_w32(ASC_IRNREN_RX | ASC_IRNREN_ERR | ASC_IRNREN_TX, | |
362 | port->membase + LTQ_ASC_IRNREN); | |
363 | return 0; | |
364 | ||
365 | err2: | |
366 | free_irq(ltq_port->rx_irq, port); | |
367 | err1: | |
368 | free_irq(ltq_port->tx_irq, port); | |
369 | return retval; | |
370 | } | |
371 | ||
372 | static void | |
373 | lqasc_shutdown(struct uart_port *port) | |
374 | { | |
375 | struct ltq_uart_port *ltq_port = to_ltq_uart_port(port); | |
376 | free_irq(ltq_port->tx_irq, port); | |
377 | free_irq(ltq_port->rx_irq, port); | |
378 | free_irq(ltq_port->err_irq, port); | |
379 | ||
380 | ltq_w32(0, port->membase + LTQ_ASC_CON); | |
381 | ltq_w32_mask(ASCRXFCON_RXFEN, ASCRXFCON_RXFFLU, | |
382 | port->membase + LTQ_ASC_RXFCON); | |
383 | ltq_w32_mask(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU, | |
384 | port->membase + LTQ_ASC_TXFCON); | |
385 | } | |
386 | ||
387 | static void | |
388 | lqasc_set_termios(struct uart_port *port, | |
389 | struct ktermios *new, struct ktermios *old) | |
390 | { | |
391 | unsigned int cflag; | |
392 | unsigned int iflag; | |
393 | unsigned int divisor; | |
394 | unsigned int baud; | |
395 | unsigned int con = 0; | |
396 | unsigned long flags; | |
397 | ||
398 | cflag = new->c_cflag; | |
399 | iflag = new->c_iflag; | |
400 | ||
401 | switch (cflag & CSIZE) { | |
402 | case CS7: | |
403 | con = ASCCON_M_7ASYNC; | |
404 | break; | |
405 | ||
406 | case CS5: | |
407 | case CS6: | |
408 | default: | |
409 | new->c_cflag &= ~ CSIZE; | |
410 | new->c_cflag |= CS8; | |
411 | con = ASCCON_M_8ASYNC; | |
412 | break; | |
413 | } | |
414 | ||
415 | cflag &= ~CMSPAR; /* Mark/Space parity is not supported */ | |
416 | ||
417 | if (cflag & CSTOPB) | |
418 | con |= ASCCON_STP; | |
419 | ||
420 | if (cflag & PARENB) { | |
421 | if (!(cflag & PARODD)) | |
422 | con &= ~ASCCON_ODD; | |
423 | else | |
424 | con |= ASCCON_ODD; | |
425 | } | |
426 | ||
427 | port->read_status_mask = ASCSTATE_ROE; | |
428 | if (iflag & INPCK) | |
429 | port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE; | |
430 | ||
431 | port->ignore_status_mask = 0; | |
432 | if (iflag & IGNPAR) | |
433 | port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE; | |
434 | ||
435 | if (iflag & IGNBRK) { | |
436 | /* | |
437 | * If we're ignoring parity and break indicators, | |
438 | * ignore overruns too (for real raw support). | |
439 | */ | |
440 | if (iflag & IGNPAR) | |
441 | port->ignore_status_mask |= ASCSTATE_ROE; | |
442 | } | |
443 | ||
444 | if ((cflag & CREAD) == 0) | |
445 | port->ignore_status_mask |= UART_DUMMY_UER_RX; | |
446 | ||
447 | /* set error signals - framing, parity and overrun, enable receiver */ | |
448 | con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN; | |
449 | ||
450 | spin_lock_irqsave(<q_asc_lock, flags); | |
451 | ||
452 | /* set up CON */ | |
453 | ltq_w32_mask(0, con, port->membase + LTQ_ASC_CON); | |
454 | ||
455 | /* Set baud rate - take a divider of 2 into account */ | |
456 | baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16); | |
457 | divisor = uart_get_divisor(port, baud); | |
458 | divisor = divisor / 2 - 1; | |
459 | ||
460 | /* disable the baudrate generator */ | |
461 | ltq_w32_mask(ASCCON_R, 0, port->membase + LTQ_ASC_CON); | |
462 | ||
463 | /* make sure the fractional divider is off */ | |
464 | ltq_w32_mask(ASCCON_FDE, 0, port->membase + LTQ_ASC_CON); | |
465 | ||
466 | /* set up to use divisor of 2 */ | |
467 | ltq_w32_mask(ASCCON_BRS, 0, port->membase + LTQ_ASC_CON); | |
468 | ||
469 | /* now we can write the new baudrate into the register */ | |
470 | ltq_w32(divisor, port->membase + LTQ_ASC_BG); | |
471 | ||
472 | /* turn the baudrate generator back on */ | |
473 | ltq_w32_mask(0, ASCCON_R, port->membase + LTQ_ASC_CON); | |
474 | ||
475 | /* enable rx */ | |
476 | ltq_w32(ASCWHBSTATE_SETREN, port->membase + LTQ_ASC_WHBSTATE); | |
477 | ||
478 | spin_unlock_irqrestore(<q_asc_lock, flags); | |
479 | ||
480 | /* Don't rewrite B0 */ | |
481 | if (tty_termios_baud_rate(new)) | |
482 | tty_termios_encode_baud_rate(new, baud, baud); | |
483 | } | |
484 | ||
485 | static const char* | |
486 | lqasc_type(struct uart_port *port) | |
487 | { | |
488 | if (port->type == PORT_LTQ_ASC) | |
489 | return DRVNAME; | |
490 | else | |
491 | return NULL; | |
492 | } | |
493 | ||
494 | static void | |
495 | lqasc_release_port(struct uart_port *port) | |
496 | { | |
497 | if (port->flags & UPF_IOREMAP) { | |
498 | iounmap(port->membase); | |
499 | port->membase = NULL; | |
500 | } | |
501 | } | |
502 | ||
503 | static int | |
504 | lqasc_request_port(struct uart_port *port) | |
505 | { | |
506 | struct platform_device *pdev = to_platform_device(port->dev); | |
507 | struct resource *res; | |
508 | int size; | |
509 | ||
510 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
511 | if (!res) { | |
512 | dev_err(&pdev->dev, "cannot obtain I/O memory region"); | |
513 | return -ENODEV; | |
514 | } | |
515 | size = resource_size(res); | |
516 | ||
517 | res = devm_request_mem_region(&pdev->dev, res->start, | |
518 | size, dev_name(&pdev->dev)); | |
519 | if (!res) { | |
520 | dev_err(&pdev->dev, "cannot request I/O memory region"); | |
521 | return -EBUSY; | |
522 | } | |
523 | ||
524 | if (port->flags & UPF_IOREMAP) { | |
525 | port->membase = devm_ioremap_nocache(&pdev->dev, | |
526 | port->mapbase, size); | |
527 | if (port->membase == NULL) | |
528 | return -ENOMEM; | |
529 | } | |
530 | return 0; | |
531 | } | |
532 | ||
533 | static void | |
534 | lqasc_config_port(struct uart_port *port, int flags) | |
535 | { | |
536 | if (flags & UART_CONFIG_TYPE) { | |
537 | port->type = PORT_LTQ_ASC; | |
538 | lqasc_request_port(port); | |
539 | } | |
540 | } | |
541 | ||
542 | static int | |
543 | lqasc_verify_port(struct uart_port *port, | |
544 | struct serial_struct *ser) | |
545 | { | |
546 | int ret = 0; | |
547 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_LTQ_ASC) | |
548 | ret = -EINVAL; | |
549 | if (ser->irq < 0 || ser->irq >= NR_IRQS) | |
550 | ret = -EINVAL; | |
551 | if (ser->baud_base < 9600) | |
552 | ret = -EINVAL; | |
553 | return ret; | |
554 | } | |
555 | ||
556 | static struct uart_ops lqasc_pops = { | |
557 | .tx_empty = lqasc_tx_empty, | |
558 | .set_mctrl = lqasc_set_mctrl, | |
559 | .get_mctrl = lqasc_get_mctrl, | |
560 | .stop_tx = lqasc_stop_tx, | |
561 | .start_tx = lqasc_start_tx, | |
562 | .stop_rx = lqasc_stop_rx, | |
563 | .enable_ms = lqasc_enable_ms, | |
564 | .break_ctl = lqasc_break_ctl, | |
565 | .startup = lqasc_startup, | |
566 | .shutdown = lqasc_shutdown, | |
567 | .set_termios = lqasc_set_termios, | |
568 | .type = lqasc_type, | |
569 | .release_port = lqasc_release_port, | |
570 | .request_port = lqasc_request_port, | |
571 | .config_port = lqasc_config_port, | |
572 | .verify_port = lqasc_verify_port, | |
573 | }; | |
574 | ||
575 | static void | |
576 | lqasc_console_putchar(struct uart_port *port, int ch) | |
577 | { | |
578 | int fifofree; | |
579 | ||
580 | if (!port->membase) | |
581 | return; | |
582 | ||
583 | do { | |
584 | fifofree = (ltq_r32(port->membase + LTQ_ASC_FSTAT) | |
585 | & ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF; | |
586 | } while (fifofree == 0); | |
587 | ltq_w8(ch, port->membase + LTQ_ASC_TBUF); | |
588 | } | |
589 | ||
590 | ||
591 | static void | |
592 | lqasc_console_write(struct console *co, const char *s, u_int count) | |
593 | { | |
594 | struct ltq_uart_port *ltq_port; | |
595 | struct uart_port *port; | |
596 | unsigned long flags; | |
597 | ||
598 | if (co->index >= MAXPORTS) | |
599 | return; | |
600 | ||
601 | ltq_port = lqasc_port[co->index]; | |
602 | if (!ltq_port) | |
603 | return; | |
604 | ||
605 | port = <q_port->port; | |
606 | ||
607 | spin_lock_irqsave(<q_asc_lock, flags); | |
608 | uart_console_write(port, s, count, lqasc_console_putchar); | |
609 | spin_unlock_irqrestore(<q_asc_lock, flags); | |
610 | } | |
611 | ||
612 | static int __init | |
613 | lqasc_console_setup(struct console *co, char *options) | |
614 | { | |
615 | struct ltq_uart_port *ltq_port; | |
616 | struct uart_port *port; | |
617 | int baud = 115200; | |
618 | int bits = 8; | |
619 | int parity = 'n'; | |
620 | int flow = 'n'; | |
621 | ||
622 | if (co->index >= MAXPORTS) | |
623 | return -ENODEV; | |
624 | ||
625 | ltq_port = lqasc_port[co->index]; | |
626 | if (!ltq_port) | |
627 | return -ENODEV; | |
628 | ||
629 | port = <q_port->port; | |
630 | ||
631 | port->uartclk = clk_get_rate(ltq_port->clk); | |
632 | ||
633 | if (options) | |
634 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
635 | return uart_set_options(port, co, baud, parity, bits, flow); | |
636 | } | |
637 | ||
638 | static struct console lqasc_console = { | |
639 | .name = "ttyLTQ", | |
640 | .write = lqasc_console_write, | |
641 | .device = uart_console_device, | |
642 | .setup = lqasc_console_setup, | |
643 | .flags = CON_PRINTBUFFER, | |
644 | .index = -1, | |
645 | .data = &lqasc_reg, | |
646 | }; | |
647 | ||
648 | static int __init | |
649 | lqasc_console_init(void) | |
650 | { | |
651 | register_console(&lqasc_console); | |
652 | return 0; | |
653 | } | |
654 | console_initcall(lqasc_console_init); | |
655 | ||
656 | static struct uart_driver lqasc_reg = { | |
657 | .owner = THIS_MODULE, | |
658 | .driver_name = DRVNAME, | |
659 | .dev_name = "ttyLTQ", | |
660 | .major = 0, | |
661 | .minor = 0, | |
662 | .nr = MAXPORTS, | |
663 | .cons = &lqasc_console, | |
664 | }; | |
665 | ||
666 | static int __init | |
667 | lqasc_probe(struct platform_device *pdev) | |
668 | { | |
669 | struct ltq_uart_port *ltq_port; | |
670 | struct uart_port *port; | |
671 | struct resource *mmres, *irqres; | |
672 | int tx_irq, rx_irq, err_irq; | |
673 | struct clk *clk; | |
674 | int ret; | |
675 | ||
676 | mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
677 | irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
678 | if (!mmres || !irqres) | |
679 | return -ENODEV; | |
680 | ||
681 | if (pdev->id >= MAXPORTS) | |
682 | return -EBUSY; | |
683 | ||
684 | if (lqasc_port[pdev->id] != NULL) | |
685 | return -EBUSY; | |
686 | ||
687 | clk = clk_get(&pdev->dev, "fpi"); | |
688 | if (IS_ERR(clk)) { | |
689 | pr_err("failed to get fpi clk\n"); | |
690 | return -ENOENT; | |
691 | } | |
692 | ||
693 | tx_irq = platform_get_irq_byname(pdev, "tx"); | |
694 | rx_irq = platform_get_irq_byname(pdev, "rx"); | |
695 | err_irq = platform_get_irq_byname(pdev, "err"); | |
696 | if ((tx_irq < 0) | (rx_irq < 0) | (err_irq < 0)) | |
697 | return -ENODEV; | |
698 | ||
699 | ltq_port = kzalloc(sizeof(struct ltq_uart_port), GFP_KERNEL); | |
700 | if (!ltq_port) | |
701 | return -ENOMEM; | |
702 | ||
703 | port = <q_port->port; | |
704 | ||
705 | port->iotype = SERIAL_IO_MEM; | |
706 | port->flags = ASYNC_BOOT_AUTOCONF | UPF_IOREMAP; | |
707 | port->ops = &lqasc_pops; | |
708 | port->fifosize = 16; | |
709 | port->type = PORT_LTQ_ASC, | |
710 | port->line = pdev->id; | |
711 | port->dev = &pdev->dev; | |
712 | ||
713 | port->irq = tx_irq; /* unused, just to be backward-compatibe */ | |
714 | port->mapbase = mmres->start; | |
715 | ||
716 | ltq_port->clk = clk; | |
717 | ||
718 | ltq_port->tx_irq = tx_irq; | |
719 | ltq_port->rx_irq = rx_irq; | |
720 | ltq_port->err_irq = err_irq; | |
721 | ||
722 | lqasc_port[pdev->id] = ltq_port; | |
723 | platform_set_drvdata(pdev, ltq_port); | |
724 | ||
725 | ret = uart_add_one_port(&lqasc_reg, port); | |
726 | ||
727 | return ret; | |
728 | } | |
729 | ||
730 | static struct platform_driver lqasc_driver = { | |
731 | .driver = { | |
732 | .name = DRVNAME, | |
733 | .owner = THIS_MODULE, | |
734 | }, | |
735 | }; | |
736 | ||
737 | int __init | |
738 | init_lqasc(void) | |
739 | { | |
740 | int ret; | |
741 | ||
742 | ret = uart_register_driver(&lqasc_reg); | |
743 | if (ret != 0) | |
744 | return ret; | |
745 | ||
746 | ret = platform_driver_probe(&lqasc_driver, lqasc_probe); | |
747 | if (ret != 0) | |
748 | uart_unregister_driver(&lqasc_reg); | |
749 | ||
750 | return ret; | |
751 | } | |
752 | ||
753 | module_init(init_lqasc); | |
754 | ||
755 | MODULE_DESCRIPTION("Lantiq serial port driver"); | |
756 | MODULE_LICENSE("GPL"); |