Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/serial/mpc52xx_uart.c | |
3 | * | |
4 | * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs. | |
5 | * | |
6 | * FIXME According to the usermanual the status bits in the status register | |
7 | * are only updated when the peripherals access the FIFO and not when the | |
8 | * CPU access them. So since we use this bits to know when we stop writing | |
9 | * and reading, they may not be updated in-time and a race condition may | |
10 | * exists. But I haven't be able to prove this and I don't care. But if | |
11 | * any problem arises, it might worth checking. The TX/RX FIFO Stats | |
12 | * registers should be used in addition. | |
13 | * Update: Actually, they seem updated ... At least the bits we use. | |
14 | * | |
15 | * | |
16 | * Maintainer : Sylvain Munaut <tnt@246tNt.com> | |
17 | * | |
18 | * Some of the code has been inspired/copied from the 2.4 code written | |
19 | * by Dale Farnsworth <dfarnsworth@mvista.com>. | |
20 | * | |
21 | * Copyright (C) 2004-2005 Sylvain Munaut <tnt@246tNt.com> | |
22 | * Copyright (C) 2003 MontaVista, Software, Inc. | |
23 | * | |
24 | * This file is licensed under the terms of the GNU General Public License | |
25 | * version 2. This program is licensed "as is" without any warranty of any | |
26 | * kind, whether express or implied. | |
27 | */ | |
28 | ||
29 | /* Platform device Usage : | |
30 | * | |
31 | * Since PSCs can have multiple function, the correct driver for each one | |
32 | * is selected by calling mpc52xx_match_psc_function(...). The function | |
33 | * handled by this driver is "uart". | |
34 | * | |
35 | * The driver init all necessary registers to place the PSC in uart mode without | |
36 | * DCD. However, the pin multiplexing aren't changed and should be set either | |
37 | * by the bootloader or in the platform init code. | |
38 | * | |
39 | * The idx field must be equal to the PSC index ( e.g. 0 for PSC1, 1 for PSC2, | |
d62de3aa SM |
40 | * and so on). So the PSC1 is mapped to /dev/ttyPSC0, PSC2 to /dev/ttyPSC1 and |
41 | * so on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly | |
42 | * fpr the console code : without this 1:1 mapping, at early boot time, when we | |
c30fe7f7 | 43 | * are parsing the kernel args console=ttyPSC?, we wouldn't know which PSC it |
d62de3aa | 44 | * will be mapped to. |
1da177e4 LT |
45 | */ |
46 | ||
d052d1be | 47 | #include <linux/platform_device.h> |
1da177e4 LT |
48 | #include <linux/module.h> |
49 | #include <linux/tty.h> | |
50 | #include <linux/serial.h> | |
51 | #include <linux/sysrq.h> | |
52 | #include <linux/console.h> | |
53 | ||
54 | #include <asm/delay.h> | |
55 | #include <asm/io.h> | |
56 | ||
57 | #include <asm/mpc52xx.h> | |
58 | #include <asm/mpc52xx_psc.h> | |
59 | ||
60 | #if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
61 | #define SUPPORT_SYSRQ | |
62 | #endif | |
63 | ||
64 | #include <linux/serial_core.h> | |
65 | ||
66 | ||
d62de3aa SM |
67 | /* We've been assigned a range on the "Low-density serial ports" major */ |
68 | #define SERIAL_PSC_MAJOR 204 | |
69 | #define SERIAL_PSC_MINOR 148 | |
70 | ||
1da177e4 LT |
71 | |
72 | #define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */ | |
73 | ||
74 | ||
75 | static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM]; | |
76 | /* Rem: - We use the read_status_mask as a shadow of | |
77 | * psc->mpc52xx_psc_imr | |
78 | * - It's important that is array is all zero on start as we | |
79 | * use it to know if it's initialized or not ! If it's not sure | |
80 | * it's cleared, then a memset(...,0,...) should be added to | |
81 | * the console_init | |
82 | */ | |
83 | ||
84 | #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase)) | |
85 | ||
86 | ||
87 | /* Forward declaration of the interruption handling routine */ | |
88 | static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id,struct pt_regs *regs); | |
89 | ||
90 | ||
91 | /* Simple macro to test if a port is console or not. This one is taken | |
92 | * for serial_core.c and maybe should be moved to serial_core.h ? */ | |
93 | #ifdef CONFIG_SERIAL_CORE_CONSOLE | |
94 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) | |
95 | #else | |
96 | #define uart_console(port) (0) | |
97 | #endif | |
98 | ||
99 | ||
100 | /* ======================================================================== */ | |
101 | /* UART operations */ | |
102 | /* ======================================================================== */ | |
103 | ||
104 | static unsigned int | |
105 | mpc52xx_uart_tx_empty(struct uart_port *port) | |
106 | { | |
107 | int status = in_be16(&PSC(port)->mpc52xx_psc_status); | |
108 | return (status & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0; | |
109 | } | |
110 | ||
111 | static void | |
112 | mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
113 | { | |
114 | /* Not implemented */ | |
115 | } | |
116 | ||
117 | static unsigned int | |
118 | mpc52xx_uart_get_mctrl(struct uart_port *port) | |
119 | { | |
120 | /* Not implemented */ | |
121 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
122 | } | |
123 | ||
124 | static void | |
b129a8cc | 125 | mpc52xx_uart_stop_tx(struct uart_port *port) |
1da177e4 LT |
126 | { |
127 | /* port->lock taken by caller */ | |
128 | port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY; | |
129 | out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); | |
130 | } | |
131 | ||
132 | static void | |
b129a8cc | 133 | mpc52xx_uart_start_tx(struct uart_port *port) |
1da177e4 LT |
134 | { |
135 | /* port->lock taken by caller */ | |
136 | port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY; | |
137 | out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); | |
138 | } | |
139 | ||
140 | static void | |
141 | mpc52xx_uart_send_xchar(struct uart_port *port, char ch) | |
142 | { | |
143 | unsigned long flags; | |
144 | spin_lock_irqsave(&port->lock, flags); | |
145 | ||
146 | port->x_char = ch; | |
147 | if (ch) { | |
148 | /* Make sure tx interrupts are on */ | |
149 | /* Truly necessary ??? They should be anyway */ | |
150 | port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY; | |
151 | out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); | |
152 | } | |
153 | ||
154 | spin_unlock_irqrestore(&port->lock, flags); | |
155 | } | |
156 | ||
157 | static void | |
158 | mpc52xx_uart_stop_rx(struct uart_port *port) | |
159 | { | |
160 | /* port->lock taken by caller */ | |
161 | port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY; | |
162 | out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask); | |
163 | } | |
164 | ||
165 | static void | |
166 | mpc52xx_uart_enable_ms(struct uart_port *port) | |
167 | { | |
168 | /* Not implemented */ | |
169 | } | |
170 | ||
171 | static void | |
172 | mpc52xx_uart_break_ctl(struct uart_port *port, int ctl) | |
173 | { | |
174 | unsigned long flags; | |
175 | spin_lock_irqsave(&port->lock, flags); | |
176 | ||
177 | if ( ctl == -1 ) | |
178 | out_8(&PSC(port)->command,MPC52xx_PSC_START_BRK); | |
179 | else | |
180 | out_8(&PSC(port)->command,MPC52xx_PSC_STOP_BRK); | |
181 | ||
182 | spin_unlock_irqrestore(&port->lock, flags); | |
183 | } | |
184 | ||
185 | static int | |
186 | mpc52xx_uart_startup(struct uart_port *port) | |
187 | { | |
188 | struct mpc52xx_psc __iomem *psc = PSC(port); | |
189 | int ret; | |
190 | ||
191 | /* Request IRQ */ | |
192 | ret = request_irq(port->irq, mpc52xx_uart_int, | |
40663cc7 | 193 | IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "mpc52xx_psc_uart", port); |
1da177e4 LT |
194 | if (ret) |
195 | return ret; | |
196 | ||
197 | /* Reset/activate the port, clear and enable interrupts */ | |
198 | out_8(&psc->command,MPC52xx_PSC_RST_RX); | |
199 | out_8(&psc->command,MPC52xx_PSC_RST_TX); | |
200 | ||
201 | out_be32(&psc->sicr,0); /* UART mode DCD ignored */ | |
202 | ||
203 | out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00); /* /16 prescaler on */ | |
204 | ||
205 | out_8(&psc->rfcntl, 0x00); | |
206 | out_be16(&psc->rfalarm, 0x1ff); | |
207 | out_8(&psc->tfcntl, 0x07); | |
208 | out_be16(&psc->tfalarm, 0x80); | |
209 | ||
210 | port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY; | |
211 | out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask); | |
212 | ||
213 | out_8(&psc->command,MPC52xx_PSC_TX_ENABLE); | |
214 | out_8(&psc->command,MPC52xx_PSC_RX_ENABLE); | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static void | |
220 | mpc52xx_uart_shutdown(struct uart_port *port) | |
221 | { | |
222 | struct mpc52xx_psc __iomem *psc = PSC(port); | |
223 | ||
224 | /* Shut down the port, interrupt and all */ | |
225 | out_8(&psc->command,MPC52xx_PSC_RST_RX); | |
226 | out_8(&psc->command,MPC52xx_PSC_RST_TX); | |
227 | ||
228 | port->read_status_mask = 0; | |
229 | out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask); | |
230 | ||
231 | /* Release interrupt */ | |
232 | free_irq(port->irq, port); | |
233 | } | |
234 | ||
235 | static void | |
236 | mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new, | |
237 | struct termios *old) | |
238 | { | |
239 | struct mpc52xx_psc __iomem *psc = PSC(port); | |
240 | unsigned long flags; | |
241 | unsigned char mr1, mr2; | |
242 | unsigned short ctr; | |
243 | unsigned int j, baud, quot; | |
244 | ||
245 | /* Prepare what we're gonna write */ | |
246 | mr1 = 0; | |
247 | ||
248 | switch (new->c_cflag & CSIZE) { | |
249 | case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS; | |
250 | break; | |
251 | case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS; | |
252 | break; | |
253 | case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS; | |
254 | break; | |
255 | case CS8: | |
256 | default: mr1 |= MPC52xx_PSC_MODE_8_BITS; | |
257 | } | |
258 | ||
259 | if (new->c_cflag & PARENB) { | |
260 | mr1 |= (new->c_cflag & PARODD) ? | |
261 | MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN; | |
262 | } else | |
263 | mr1 |= MPC52xx_PSC_MODE_PARNONE; | |
264 | ||
265 | ||
266 | mr2 = 0; | |
267 | ||
268 | if (new->c_cflag & CSTOPB) | |
269 | mr2 |= MPC52xx_PSC_MODE_TWO_STOP; | |
270 | else | |
271 | mr2 |= ((new->c_cflag & CSIZE) == CS5) ? | |
272 | MPC52xx_PSC_MODE_ONE_STOP_5_BITS : | |
273 | MPC52xx_PSC_MODE_ONE_STOP; | |
274 | ||
275 | ||
276 | baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16); | |
277 | quot = uart_get_divisor(port, baud); | |
278 | ctr = quot & 0xffff; | |
279 | ||
280 | /* Get the lock */ | |
281 | spin_lock_irqsave(&port->lock, flags); | |
282 | ||
283 | /* Update the per-port timeout */ | |
284 | uart_update_timeout(port, new->c_cflag, baud); | |
285 | ||
286 | /* Do our best to flush TX & RX, so we don't loose anything */ | |
287 | /* But we don't wait indefinitly ! */ | |
288 | j = 5000000; /* Maximum wait */ | |
289 | /* FIXME Can't receive chars since set_termios might be called at early | |
290 | * boot for the console, all stuff is not yet ready to receive at that | |
291 | * time and that just makes the kernel oops */ | |
292 | /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */ | |
293 | while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) && | |
294 | --j) | |
295 | udelay(1); | |
296 | ||
297 | if (!j) | |
298 | printk( KERN_ERR "mpc52xx_uart.c: " | |
299 | "Unable to flush RX & TX fifos in-time in set_termios." | |
300 | "Some chars may have been lost.\n" ); | |
301 | ||
302 | /* Reset the TX & RX */ | |
303 | out_8(&psc->command,MPC52xx_PSC_RST_RX); | |
304 | out_8(&psc->command,MPC52xx_PSC_RST_TX); | |
305 | ||
306 | /* Send new mode settings */ | |
307 | out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1); | |
308 | out_8(&psc->mode,mr1); | |
309 | out_8(&psc->mode,mr2); | |
310 | out_8(&psc->ctur,ctr >> 8); | |
311 | out_8(&psc->ctlr,ctr & 0xff); | |
312 | ||
313 | /* Reenable TX & RX */ | |
314 | out_8(&psc->command,MPC52xx_PSC_TX_ENABLE); | |
315 | out_8(&psc->command,MPC52xx_PSC_RX_ENABLE); | |
316 | ||
317 | /* We're all set, release the lock */ | |
318 | spin_unlock_irqrestore(&port->lock, flags); | |
319 | } | |
320 | ||
321 | static const char * | |
322 | mpc52xx_uart_type(struct uart_port *port) | |
323 | { | |
324 | return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL; | |
325 | } | |
326 | ||
327 | static void | |
328 | mpc52xx_uart_release_port(struct uart_port *port) | |
329 | { | |
330 | if (port->flags & UPF_IOREMAP) { /* remapped by us ? */ | |
331 | iounmap(port->membase); | |
332 | port->membase = NULL; | |
333 | } | |
334 | ||
335 | release_mem_region(port->mapbase, MPC52xx_PSC_SIZE); | |
336 | } | |
337 | ||
338 | static int | |
339 | mpc52xx_uart_request_port(struct uart_port *port) | |
340 | { | |
341 | if (port->flags & UPF_IOREMAP) /* Need to remap ? */ | |
342 | port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE); | |
343 | ||
344 | if (!port->membase) | |
345 | return -EINVAL; | |
346 | ||
347 | return request_mem_region(port->mapbase, MPC52xx_PSC_SIZE, | |
348 | "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY; | |
349 | } | |
350 | ||
351 | static void | |
352 | mpc52xx_uart_config_port(struct uart_port *port, int flags) | |
353 | { | |
354 | if ( (flags & UART_CONFIG_TYPE) && | |
355 | (mpc52xx_uart_request_port(port) == 0) ) | |
356 | port->type = PORT_MPC52xx; | |
357 | } | |
358 | ||
359 | static int | |
360 | mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser) | |
361 | { | |
362 | if ( ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx ) | |
363 | return -EINVAL; | |
364 | ||
365 | if ( (ser->irq != port->irq) || | |
366 | (ser->io_type != SERIAL_IO_MEM) || | |
367 | (ser->baud_base != port->uartclk) || | |
368 | (ser->iomem_base != (void*)port->mapbase) || | |
369 | (ser->hub6 != 0 ) ) | |
370 | return -EINVAL; | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | ||
376 | static struct uart_ops mpc52xx_uart_ops = { | |
377 | .tx_empty = mpc52xx_uart_tx_empty, | |
378 | .set_mctrl = mpc52xx_uart_set_mctrl, | |
379 | .get_mctrl = mpc52xx_uart_get_mctrl, | |
380 | .stop_tx = mpc52xx_uart_stop_tx, | |
381 | .start_tx = mpc52xx_uart_start_tx, | |
382 | .send_xchar = mpc52xx_uart_send_xchar, | |
383 | .stop_rx = mpc52xx_uart_stop_rx, | |
384 | .enable_ms = mpc52xx_uart_enable_ms, | |
385 | .break_ctl = mpc52xx_uart_break_ctl, | |
386 | .startup = mpc52xx_uart_startup, | |
387 | .shutdown = mpc52xx_uart_shutdown, | |
388 | .set_termios = mpc52xx_uart_set_termios, | |
389 | /* .pm = mpc52xx_uart_pm, Not supported yet */ | |
390 | /* .set_wake = mpc52xx_uart_set_wake, Not supported yet */ | |
391 | .type = mpc52xx_uart_type, | |
392 | .release_port = mpc52xx_uart_release_port, | |
393 | .request_port = mpc52xx_uart_request_port, | |
394 | .config_port = mpc52xx_uart_config_port, | |
395 | .verify_port = mpc52xx_uart_verify_port | |
396 | }; | |
397 | ||
398 | ||
399 | /* ======================================================================== */ | |
400 | /* Interrupt handling */ | |
401 | /* ======================================================================== */ | |
402 | ||
403 | static inline int | |
404 | mpc52xx_uart_int_rx_chars(struct uart_port *port, struct pt_regs *regs) | |
405 | { | |
406 | struct tty_struct *tty = port->info->tty; | |
33f0f88f | 407 | unsigned char ch, flag; |
1da177e4 LT |
408 | unsigned short status; |
409 | ||
410 | /* While we can read, do so ! */ | |
411 | while ( (status = in_be16(&PSC(port)->mpc52xx_psc_status)) & | |
412 | MPC52xx_PSC_SR_RXRDY) { | |
413 | ||
1da177e4 LT |
414 | /* Get the char */ |
415 | ch = in_8(&PSC(port)->mpc52xx_psc_buffer_8); | |
416 | ||
417 | /* Handle sysreq char */ | |
418 | #ifdef SUPPORT_SYSRQ | |
419 | if (uart_handle_sysrq_char(port, ch, regs)) { | |
420 | port->sysrq = 0; | |
421 | continue; | |
422 | } | |
423 | #endif | |
424 | ||
425 | /* Store it */ | |
33f0f88f AC |
426 | |
427 | flag = TTY_NORMAL; | |
1da177e4 LT |
428 | port->icount.rx++; |
429 | ||
430 | if ( status & (MPC52xx_PSC_SR_PE | | |
431 | MPC52xx_PSC_SR_FE | | |
33f0f88f | 432 | MPC52xx_PSC_SR_RB) ) { |
1da177e4 LT |
433 | |
434 | if (status & MPC52xx_PSC_SR_RB) { | |
33f0f88f | 435 | flag = TTY_BREAK; |
1da177e4 LT |
436 | uart_handle_break(port); |
437 | } else if (status & MPC52xx_PSC_SR_PE) | |
33f0f88f | 438 | flag = TTY_PARITY; |
1da177e4 | 439 | else if (status & MPC52xx_PSC_SR_FE) |
33f0f88f | 440 | flag = TTY_FRAME; |
1da177e4 LT |
441 | |
442 | /* Clear error condition */ | |
443 | out_8(&PSC(port)->command,MPC52xx_PSC_RST_ERR_STAT); | |
444 | ||
445 | } | |
33f0f88f AC |
446 | tty_insert_flip_char(tty, ch, flag); |
447 | if (status & MPC52xx_PSC_SR_OE) { | |
448 | /* | |
449 | * Overrun is special, since it's | |
450 | * reported immediately, and doesn't | |
451 | * affect the current character | |
452 | */ | |
453 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
454 | } | |
1da177e4 LT |
455 | } |
456 | ||
457 | tty_flip_buffer_push(tty); | |
458 | ||
459 | return in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY; | |
460 | } | |
461 | ||
462 | static inline int | |
463 | mpc52xx_uart_int_tx_chars(struct uart_port *port) | |
464 | { | |
465 | struct circ_buf *xmit = &port->info->xmit; | |
466 | ||
467 | /* Process out of band chars */ | |
468 | if (port->x_char) { | |
469 | out_8(&PSC(port)->mpc52xx_psc_buffer_8, port->x_char); | |
470 | port->icount.tx++; | |
471 | port->x_char = 0; | |
472 | return 1; | |
473 | } | |
474 | ||
475 | /* Nothing to do ? */ | |
476 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
b129a8cc | 477 | mpc52xx_uart_stop_tx(port); |
1da177e4 LT |
478 | return 0; |
479 | } | |
480 | ||
481 | /* Send chars */ | |
482 | while (in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXRDY) { | |
483 | out_8(&PSC(port)->mpc52xx_psc_buffer_8, xmit->buf[xmit->tail]); | |
484 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
485 | port->icount.tx++; | |
486 | if (uart_circ_empty(xmit)) | |
487 | break; | |
488 | } | |
489 | ||
490 | /* Wake up */ | |
491 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
492 | uart_write_wakeup(port); | |
493 | ||
494 | /* Maybe we're done after all */ | |
495 | if (uart_circ_empty(xmit)) { | |
b129a8cc | 496 | mpc52xx_uart_stop_tx(port); |
1da177e4 LT |
497 | return 0; |
498 | } | |
499 | ||
500 | return 1; | |
501 | } | |
502 | ||
503 | static irqreturn_t | |
504 | mpc52xx_uart_int(int irq, void *dev_id, struct pt_regs *regs) | |
505 | { | |
506 | struct uart_port *port = (struct uart_port *) dev_id; | |
507 | unsigned long pass = ISR_PASS_LIMIT; | |
508 | unsigned int keepgoing; | |
509 | unsigned short status; | |
510 | ||
511 | if ( irq != port->irq ) { | |
512 | printk( KERN_WARNING | |
513 | "mpc52xx_uart_int : " \ | |
514 | "Received wrong int %d. Waiting for %d\n", | |
515 | irq, port->irq); | |
516 | return IRQ_NONE; | |
517 | } | |
518 | ||
519 | spin_lock(&port->lock); | |
520 | ||
521 | /* While we have stuff to do, we continue */ | |
522 | do { | |
523 | /* If we don't find anything to do, we stop */ | |
524 | keepgoing = 0; | |
525 | ||
526 | /* Read status */ | |
527 | status = in_be16(&PSC(port)->mpc52xx_psc_isr); | |
528 | status &= port->read_status_mask; | |
529 | ||
530 | /* Do we need to receive chars ? */ | |
531 | /* For this RX interrupts must be on and some chars waiting */ | |
532 | if ( status & MPC52xx_PSC_IMR_RXRDY ) | |
533 | keepgoing |= mpc52xx_uart_int_rx_chars(port, regs); | |
534 | ||
535 | /* Do we need to send chars ? */ | |
536 | /* For this, TX must be ready and TX interrupt enabled */ | |
537 | if ( status & MPC52xx_PSC_IMR_TXRDY ) | |
538 | keepgoing |= mpc52xx_uart_int_tx_chars(port); | |
539 | ||
540 | /* Limit number of iteration */ | |
541 | if ( !(--pass) ) | |
542 | keepgoing = 0; | |
543 | ||
544 | } while (keepgoing); | |
545 | ||
546 | spin_unlock(&port->lock); | |
547 | ||
548 | return IRQ_HANDLED; | |
549 | } | |
550 | ||
551 | ||
552 | /* ======================================================================== */ | |
553 | /* Console ( if applicable ) */ | |
554 | /* ======================================================================== */ | |
555 | ||
556 | #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE | |
557 | ||
558 | static void __init | |
559 | mpc52xx_console_get_options(struct uart_port *port, | |
560 | int *baud, int *parity, int *bits, int *flow) | |
561 | { | |
562 | struct mpc52xx_psc __iomem *psc = PSC(port); | |
563 | unsigned char mr1; | |
564 | ||
565 | /* Read the mode registers */ | |
566 | out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1); | |
567 | mr1 = in_8(&psc->mode); | |
568 | ||
569 | /* CT{U,L}R are write-only ! */ | |
570 | *baud = __res.bi_baudrate ? | |
571 | __res.bi_baudrate : CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD; | |
572 | ||
573 | /* Parse them */ | |
574 | switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) { | |
575 | case MPC52xx_PSC_MODE_5_BITS: *bits = 5; break; | |
576 | case MPC52xx_PSC_MODE_6_BITS: *bits = 6; break; | |
577 | case MPC52xx_PSC_MODE_7_BITS: *bits = 7; break; | |
578 | case MPC52xx_PSC_MODE_8_BITS: | |
579 | default: *bits = 8; | |
580 | } | |
581 | ||
582 | if (mr1 & MPC52xx_PSC_MODE_PARNONE) | |
583 | *parity = 'n'; | |
584 | else | |
585 | *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e'; | |
586 | } | |
587 | ||
588 | static void | |
589 | mpc52xx_console_write(struct console *co, const char *s, unsigned int count) | |
590 | { | |
591 | struct uart_port *port = &mpc52xx_uart_ports[co->index]; | |
592 | struct mpc52xx_psc __iomem *psc = PSC(port); | |
593 | unsigned int i, j; | |
594 | ||
595 | /* Disable interrupts */ | |
596 | out_be16(&psc->mpc52xx_psc_imr, 0); | |
597 | ||
598 | /* Wait the TX buffer to be empty */ | |
599 | j = 5000000; /* Maximum wait */ | |
600 | while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) && | |
601 | --j) | |
602 | udelay(1); | |
603 | ||
604 | /* Write all the chars */ | |
d358788f | 605 | for (i = 0; i < count; i++, s++) { |
1da177e4 | 606 | /* Line return handling */ |
d358788f | 607 | if (*s == '\n') |
1da177e4 LT |
608 | out_8(&psc->mpc52xx_psc_buffer_8, '\r'); |
609 | ||
d358788f RK |
610 | /* Send the char */ |
611 | out_8(&psc->mpc52xx_psc_buffer_8, *s); | |
612 | ||
1da177e4 LT |
613 | /* Wait the TX buffer to be empty */ |
614 | j = 20000; /* Maximum wait */ | |
615 | while (!(in_be16(&psc->mpc52xx_psc_status) & | |
616 | MPC52xx_PSC_SR_TXEMP) && --j) | |
617 | udelay(1); | |
618 | } | |
619 | ||
620 | /* Restore interrupt state */ | |
621 | out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask); | |
622 | } | |
623 | ||
624 | static int __init | |
625 | mpc52xx_console_setup(struct console *co, char *options) | |
626 | { | |
627 | struct uart_port *port = &mpc52xx_uart_ports[co->index]; | |
628 | ||
629 | int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD; | |
630 | int bits = 8; | |
631 | int parity = 'n'; | |
632 | int flow = 'n'; | |
633 | ||
634 | if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM) | |
635 | return -EINVAL; | |
636 | ||
637 | /* Basic port init. Needed since we use some uart_??? func before | |
638 | * real init for early access */ | |
639 | spin_lock_init(&port->lock); | |
640 | port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */ | |
641 | port->ops = &mpc52xx_uart_ops; | |
642 | port->mapbase = MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1)); | |
643 | ||
644 | /* We ioremap ourself */ | |
645 | port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE); | |
646 | if (port->membase == NULL) | |
647 | return -EINVAL; | |
648 | ||
649 | /* Setup the port parameters accoding to options */ | |
650 | if (options) | |
651 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
652 | else | |
653 | mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow); | |
654 | ||
655 | return uart_set_options(port, co, baud, parity, bits, flow); | |
656 | } | |
657 | ||
658 | ||
2d8179c0 | 659 | static struct uart_driver mpc52xx_uart_driver; |
1da177e4 LT |
660 | |
661 | static struct console mpc52xx_console = { | |
d62de3aa | 662 | .name = "ttyPSC", |
1da177e4 LT |
663 | .write = mpc52xx_console_write, |
664 | .device = uart_console_device, | |
665 | .setup = mpc52xx_console_setup, | |
666 | .flags = CON_PRINTBUFFER, | |
d62de3aa | 667 | .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0 ) */ |
1da177e4 LT |
668 | .data = &mpc52xx_uart_driver, |
669 | }; | |
670 | ||
671 | ||
672 | static int __init | |
673 | mpc52xx_console_init(void) | |
674 | { | |
675 | register_console(&mpc52xx_console); | |
676 | return 0; | |
677 | } | |
678 | ||
679 | console_initcall(mpc52xx_console_init); | |
680 | ||
681 | #define MPC52xx_PSC_CONSOLE &mpc52xx_console | |
682 | #else | |
683 | #define MPC52xx_PSC_CONSOLE NULL | |
684 | #endif | |
685 | ||
686 | ||
687 | /* ======================================================================== */ | |
688 | /* UART Driver */ | |
689 | /* ======================================================================== */ | |
690 | ||
691 | static struct uart_driver mpc52xx_uart_driver = { | |
692 | .owner = THIS_MODULE, | |
693 | .driver_name = "mpc52xx_psc_uart", | |
d62de3aa | 694 | .dev_name = "ttyPSC", |
d62de3aa SM |
695 | .major = SERIAL_PSC_MAJOR, |
696 | .minor = SERIAL_PSC_MINOR, | |
1da177e4 LT |
697 | .nr = MPC52xx_PSC_MAXNUM, |
698 | .cons = MPC52xx_PSC_CONSOLE, | |
699 | }; | |
700 | ||
701 | ||
702 | /* ======================================================================== */ | |
703 | /* Platform Driver */ | |
704 | /* ======================================================================== */ | |
705 | ||
706 | static int __devinit | |
3ae5eaec | 707 | mpc52xx_uart_probe(struct platform_device *dev) |
1da177e4 | 708 | { |
3ae5eaec | 709 | struct resource *res = dev->resource; |
1da177e4 LT |
710 | |
711 | struct uart_port *port = NULL; | |
712 | int i, idx, ret; | |
713 | ||
714 | /* Check validity & presence */ | |
38801e2e | 715 | idx = dev->id; |
1da177e4 LT |
716 | if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM) |
717 | return -EINVAL; | |
718 | ||
719 | if (!mpc52xx_match_psc_function(idx,"uart")) | |
720 | return -ENODEV; | |
721 | ||
722 | /* Init the port structure */ | |
723 | port = &mpc52xx_uart_ports[idx]; | |
724 | ||
725 | memset(port, 0x00, sizeof(struct uart_port)); | |
726 | ||
727 | spin_lock_init(&port->lock); | |
728 | port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */ | |
947deee8 | 729 | port->fifosize = 512; |
1da177e4 LT |
730 | port->iotype = UPIO_MEM; |
731 | port->flags = UPF_BOOT_AUTOCONF | | |
732 | ( uart_console(port) ? 0 : UPF_IOREMAP ); | |
733 | port->line = idx; | |
734 | port->ops = &mpc52xx_uart_ops; | |
735 | ||
736 | /* Search for IRQ and mapbase */ | |
38801e2e | 737 | for (i=0 ; i<dev->num_resources ; i++, res++) { |
1da177e4 LT |
738 | if (res->flags & IORESOURCE_MEM) |
739 | port->mapbase = res->start; | |
740 | else if (res->flags & IORESOURCE_IRQ) | |
741 | port->irq = res->start; | |
742 | } | |
743 | if (!port->irq || !port->mapbase) | |
744 | return -EINVAL; | |
745 | ||
746 | /* Add the port to the uart sub-system */ | |
747 | ret = uart_add_one_port(&mpc52xx_uart_driver, port); | |
748 | if (!ret) | |
3ae5eaec | 749 | platform_set_drvdata(dev, (void*)port); |
1da177e4 LT |
750 | |
751 | return ret; | |
752 | } | |
753 | ||
754 | static int | |
3ae5eaec | 755 | mpc52xx_uart_remove(struct platform_device *dev) |
1da177e4 | 756 | { |
3ae5eaec | 757 | struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev); |
1da177e4 | 758 | |
3ae5eaec | 759 | platform_set_drvdata(dev, NULL); |
1da177e4 LT |
760 | |
761 | if (port) | |
762 | uart_remove_one_port(&mpc52xx_uart_driver, port); | |
763 | ||
764 | return 0; | |
765 | } | |
766 | ||
767 | #ifdef CONFIG_PM | |
768 | static int | |
3ae5eaec | 769 | mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 770 | { |
3ae5eaec | 771 | struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev); |
1da177e4 | 772 | |
9480e307 | 773 | if (sport) |
1da177e4 LT |
774 | uart_suspend_port(&mpc52xx_uart_driver, port); |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | static int | |
3ae5eaec | 780 | mpc52xx_uart_resume(struct platform_device *dev) |
1da177e4 | 781 | { |
3ae5eaec | 782 | struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev); |
1da177e4 | 783 | |
9480e307 | 784 | if (port) |
1da177e4 LT |
785 | uart_resume_port(&mpc52xx_uart_driver, port); |
786 | ||
787 | return 0; | |
788 | } | |
789 | #endif | |
790 | ||
3ae5eaec | 791 | static struct platform_driver mpc52xx_uart_platform_driver = { |
1da177e4 LT |
792 | .probe = mpc52xx_uart_probe, |
793 | .remove = mpc52xx_uart_remove, | |
794 | #ifdef CONFIG_PM | |
795 | .suspend = mpc52xx_uart_suspend, | |
796 | .resume = mpc52xx_uart_resume, | |
797 | #endif | |
3ae5eaec RK |
798 | .driver = { |
799 | .name = "mpc52xx-psc", | |
800 | }, | |
1da177e4 LT |
801 | }; |
802 | ||
803 | ||
804 | /* ======================================================================== */ | |
805 | /* Module */ | |
806 | /* ======================================================================== */ | |
807 | ||
808 | static int __init | |
809 | mpc52xx_uart_init(void) | |
810 | { | |
811 | int ret; | |
812 | ||
813 | printk(KERN_INFO "Serial: MPC52xx PSC driver\n"); | |
814 | ||
815 | ret = uart_register_driver(&mpc52xx_uart_driver); | |
816 | if (ret == 0) { | |
3ae5eaec | 817 | ret = platform_driver_register(&mpc52xx_uart_platform_driver); |
1da177e4 LT |
818 | if (ret) |
819 | uart_unregister_driver(&mpc52xx_uart_driver); | |
820 | } | |
821 | ||
822 | return ret; | |
823 | } | |
824 | ||
825 | static void __exit | |
826 | mpc52xx_uart_exit(void) | |
827 | { | |
3ae5eaec | 828 | platform_driver_unregister(&mpc52xx_uart_platform_driver); |
1da177e4 LT |
829 | uart_unregister_driver(&mpc52xx_uart_driver); |
830 | } | |
831 | ||
832 | ||
833 | module_init(mpc52xx_uart_init); | |
834 | module_exit(mpc52xx_uart_exit); | |
835 | ||
836 | MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>"); | |
837 | MODULE_DESCRIPTION("Freescale MPC52xx PSC UART"); | |
838 | MODULE_LICENSE("GPL"); |