2 * linux/drivers/mmc/card/sdio_uart.c - SDIO UART/GPS driver
4 * Based on drivers/serial/8250.c and drivers/serial/serial_core.c
7 * Author: Nicolas Pitre
8 * Created: June 15, 2007
9 * Copyright: MontaVista Software, Inc.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
18 * Note: Although this driver assumes a 16550A-like UART implementation,
19 * it is not possible to leverage the common 8250/16550 driver, nor the
20 * core UART infrastructure, as they assumes direct access to the hardware
21 * registers, often under a spinlock. This is not possible in the SDIO
22 * context as SDIO access functions must be able to sleep.
24 * Because we need to lock the SDIO host to ensure an exclusive access to
25 * the card, we simply rely on that lock to also prevent and serialize
26 * concurrent access to the same port.
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/kernel.h>
32 #include <linux/mutex.h>
33 #include <linux/seq_file.h>
34 #include <linux/serial_reg.h>
35 #include <linux/circ_buf.h>
36 #include <linux/gfp.h>
37 #include <linux/tty.h>
38 #include <linux/tty_flip.h>
40 #include <linux/mmc/core.h>
41 #include <linux/mmc/card.h>
42 #include <linux/mmc/sdio_func.h>
43 #include <linux/mmc/sdio_ids.h>
46 #define UART_NR 8 /* Number of UARTs this driver can handle */
49 #define UART_XMIT_SIZE PAGE_SIZE
50 #define WAKEUP_CHARS 256
52 #define circ_empty(circ) ((circ)->head == (circ)->tail)
53 #define circ_clear(circ) ((circ)->head = (circ)->tail = 0)
55 #define circ_chars_pending(circ) \
56 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
58 #define circ_chars_free(circ) \
59 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
75 struct sdio_uart_port {
78 struct tty_struct *tty;
81 struct mutex open_lock;
82 struct sdio_func *func;
83 struct mutex func_lock;
84 struct task_struct *in_sdio_uart_irq;
85 unsigned int regs_offset;
87 spinlock_t write_lock;
88 struct uart_icount icount;
91 unsigned int read_status_mask;
92 unsigned int ignore_status_mask;
98 static struct sdio_uart_port *sdio_uart_table[UART_NR];
99 static DEFINE_SPINLOCK(sdio_uart_table_lock);
101 static int sdio_uart_add_port(struct sdio_uart_port *port)
103 int index, ret = -EBUSY;
105 kref_init(&port->kref);
106 mutex_init(&port->open_lock);
107 mutex_init(&port->func_lock);
108 spin_lock_init(&port->write_lock);
110 spin_lock(&sdio_uart_table_lock);
111 for (index = 0; index < UART_NR; index++) {
112 if (!sdio_uart_table[index]) {
114 sdio_uart_table[index] = port;
119 spin_unlock(&sdio_uart_table_lock);
124 static struct sdio_uart_port *sdio_uart_port_get(unsigned index)
126 struct sdio_uart_port *port;
128 if (index >= UART_NR)
131 spin_lock(&sdio_uart_table_lock);
132 port = sdio_uart_table[index];
134 kref_get(&port->kref);
135 spin_unlock(&sdio_uart_table_lock);
140 static void sdio_uart_port_destroy(struct kref *kref)
142 struct sdio_uart_port *port =
143 container_of(kref, struct sdio_uart_port, kref);
147 static void sdio_uart_port_put(struct sdio_uart_port *port)
149 kref_put(&port->kref, sdio_uart_port_destroy);
152 static void sdio_uart_port_remove(struct sdio_uart_port *port)
154 struct sdio_func *func;
156 BUG_ON(sdio_uart_table[port->index] != port);
158 spin_lock(&sdio_uart_table_lock);
159 sdio_uart_table[port->index] = NULL;
160 spin_unlock(&sdio_uart_table_lock);
163 * We're killing a port that potentially still is in use by
164 * the tty layer. Be careful to prevent any further access
165 * to the SDIO function and arrange for the tty layer to
166 * give up on that port ASAP.
167 * Beware: the lock ordering is critical.
169 mutex_lock(&port->open_lock);
170 mutex_lock(&port->func_lock);
172 sdio_claim_host(func);
174 mutex_unlock(&port->func_lock);
176 tty_hangup(port->port.tty);
177 mutex_unlock(&port->open_lock);
178 sdio_release_irq(func);
179 sdio_disable_func(func);
180 sdio_release_host(func);
182 sdio_uart_port_put(port);
185 static int sdio_uart_claim_func(struct sdio_uart_port *port)
187 mutex_lock(&port->func_lock);
188 if (unlikely(!port->func)) {
189 mutex_unlock(&port->func_lock);
192 if (likely(port->in_sdio_uart_irq != current))
193 sdio_claim_host(port->func);
194 mutex_unlock(&port->func_lock);
198 static inline void sdio_uart_release_func(struct sdio_uart_port *port)
200 if (likely(port->in_sdio_uart_irq != current))
201 sdio_release_host(port->func);
204 static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
207 c = sdio_readb(port->func, port->regs_offset + offset, NULL);
211 static inline void sdio_out(struct sdio_uart_port *port, int offset, int value)
213 sdio_writeb(port->func, value, port->regs_offset + offset, NULL);
216 static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port)
218 unsigned char status;
221 status = sdio_in(port, UART_MSR);
224 if (status & UART_MSR_DCD)
226 if (status & UART_MSR_RI)
228 if (status & UART_MSR_DSR)
230 if (status & UART_MSR_CTS)
235 static void sdio_uart_write_mctrl(struct sdio_uart_port *port,
238 unsigned char mcr = 0;
240 if (mctrl & TIOCM_RTS)
242 if (mctrl & TIOCM_DTR)
244 if (mctrl & TIOCM_OUT1)
245 mcr |= UART_MCR_OUT1;
246 if (mctrl & TIOCM_OUT2)
247 mcr |= UART_MCR_OUT2;
248 if (mctrl & TIOCM_LOOP)
249 mcr |= UART_MCR_LOOP;
251 sdio_out(port, UART_MCR, mcr);
254 static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port,
255 unsigned int set, unsigned int clear)
260 port->mctrl = (old & ~clear) | set;
261 if (old != port->mctrl)
262 sdio_uart_write_mctrl(port, port->mctrl);
265 #define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0)
266 #define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x)
268 static void sdio_uart_change_speed(struct sdio_uart_port *port,
269 struct ktermios *termios,
270 struct ktermios *old)
272 unsigned char cval, fcr = 0;
273 unsigned int baud, quot;
275 switch (termios->c_cflag & CSIZE) {
277 cval = UART_LCR_WLEN5;
280 cval = UART_LCR_WLEN6;
283 cval = UART_LCR_WLEN7;
287 cval = UART_LCR_WLEN8;
291 if (termios->c_cflag & CSTOPB)
292 cval |= UART_LCR_STOP;
293 if (termios->c_cflag & PARENB)
294 cval |= UART_LCR_PARITY;
295 if (!(termios->c_cflag & PARODD))
296 cval |= UART_LCR_EPAR;
299 baud = tty_termios_baud_rate(termios);
301 baud = 9600; /* Special case: B0 rate. */
302 if (baud <= port->uartclk)
305 * Oops, the quotient was zero. Try again with the old
306 * baud rate if possible, otherwise default to 9600.
308 termios->c_cflag &= ~CBAUD;
310 termios->c_cflag |= old->c_cflag & CBAUD;
313 termios->c_cflag |= B9600;
315 quot = (2 * port->uartclk + baud) / (2 * baud);
318 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
320 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
322 port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
323 if (termios->c_iflag & INPCK)
324 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
325 if (termios->c_iflag & (BRKINT | PARMRK))
326 port->read_status_mask |= UART_LSR_BI;
329 * Characters to ignore
331 port->ignore_status_mask = 0;
332 if (termios->c_iflag & IGNPAR)
333 port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
334 if (termios->c_iflag & IGNBRK) {
335 port->ignore_status_mask |= UART_LSR_BI;
337 * If we're ignoring parity and break indicators,
338 * ignore overruns too (for real raw support).
340 if (termios->c_iflag & IGNPAR)
341 port->ignore_status_mask |= UART_LSR_OE;
345 * ignore all characters if CREAD is not set
347 if ((termios->c_cflag & CREAD) == 0)
348 port->ignore_status_mask |= UART_LSR_DR;
351 * CTS flow control flag and modem status interrupts
353 port->ier &= ~UART_IER_MSI;
354 if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL))
355 port->ier |= UART_IER_MSI;
359 sdio_out(port, UART_IER, port->ier);
360 sdio_out(port, UART_LCR, cval | UART_LCR_DLAB);
361 sdio_out(port, UART_DLL, quot & 0xff);
362 sdio_out(port, UART_DLM, quot >> 8);
363 sdio_out(port, UART_LCR, cval);
364 sdio_out(port, UART_FCR, fcr);
366 sdio_uart_write_mctrl(port, port->mctrl);
369 static void sdio_uart_start_tx(struct sdio_uart_port *port)
371 if (!(port->ier & UART_IER_THRI)) {
372 port->ier |= UART_IER_THRI;
373 sdio_out(port, UART_IER, port->ier);
377 static void sdio_uart_stop_tx(struct sdio_uart_port *port)
379 if (port->ier & UART_IER_THRI) {
380 port->ier &= ~UART_IER_THRI;
381 sdio_out(port, UART_IER, port->ier);
385 static void sdio_uart_stop_rx(struct sdio_uart_port *port)
387 port->ier &= ~UART_IER_RLSI;
388 port->read_status_mask &= ~UART_LSR_DR;
389 sdio_out(port, UART_IER, port->ier);
392 static void sdio_uart_receive_chars(struct sdio_uart_port *port,
393 unsigned int *status)
395 struct tty_struct *tty = port->port.tty;
396 unsigned int ch, flag;
400 ch = sdio_in(port, UART_RX);
404 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
405 UART_LSR_FE | UART_LSR_OE))) {
407 * For statistics only
409 if (*status & UART_LSR_BI) {
410 *status &= ~(UART_LSR_FE | UART_LSR_PE);
412 } else if (*status & UART_LSR_PE)
413 port->icount.parity++;
414 else if (*status & UART_LSR_FE)
415 port->icount.frame++;
416 if (*status & UART_LSR_OE)
417 port->icount.overrun++;
420 * Mask off conditions which should be ignored.
422 *status &= port->read_status_mask;
423 if (*status & UART_LSR_BI)
425 else if (*status & UART_LSR_PE)
427 else if (*status & UART_LSR_FE)
431 if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0)
432 tty_insert_flip_char(tty, ch, flag);
435 * Overrun is special. Since it's reported immediately,
436 * it doesn't affect the current character.
438 if (*status & ~port->ignore_status_mask & UART_LSR_OE)
439 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
441 *status = sdio_in(port, UART_LSR);
442 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
443 tty_flip_buffer_push(tty);
446 static void sdio_uart_transmit_chars(struct sdio_uart_port *port)
448 struct circ_buf *xmit = &port->xmit;
450 struct tty_struct *tty = port->port.tty;
453 sdio_out(port, UART_TX, port->x_char);
458 if (circ_empty(xmit) || tty->stopped || tty->hw_stopped) {
459 sdio_uart_stop_tx(port);
465 sdio_out(port, UART_TX, xmit->buf[xmit->tail]);
466 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
468 if (circ_empty(xmit))
470 } while (--count > 0);
472 if (circ_chars_pending(xmit) < WAKEUP_CHARS)
475 if (circ_empty(xmit))
476 sdio_uart_stop_tx(port);
479 static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
482 struct tty_struct *tty = port->port.tty;
484 status = sdio_in(port, UART_MSR);
486 if ((status & UART_MSR_ANY_DELTA) == 0)
489 if (status & UART_MSR_TERI)
491 if (status & UART_MSR_DDSR)
493 if (status & UART_MSR_DDCD)
495 if (status & UART_MSR_DCTS) {
497 if (tty->termios->c_cflag & CRTSCTS) {
498 int cts = (status & UART_MSR_CTS);
499 if (tty->hw_stopped) {
502 sdio_uart_start_tx(port);
508 sdio_uart_stop_tx(port);
516 * This handles the interrupt from one port.
518 static void sdio_uart_irq(struct sdio_func *func)
520 struct sdio_uart_port *port = sdio_get_drvdata(func);
521 unsigned int iir, lsr;
524 * In a few places sdio_uart_irq() is called directly instead of
525 * waiting for the actual interrupt to be raised and the SDIO IRQ
526 * thread scheduled in order to reduce latency. However, some
527 * interaction with the tty core may end up calling us back
528 * (serial echo, flow control, etc.) through those same places
529 * causing undesirable effects. Let's stop the recursion here.
531 if (unlikely(port->in_sdio_uart_irq == current))
534 iir = sdio_in(port, UART_IIR);
535 if (iir & UART_IIR_NO_INT)
538 port->in_sdio_uart_irq = current;
539 lsr = sdio_in(port, UART_LSR);
540 if (lsr & UART_LSR_DR)
541 sdio_uart_receive_chars(port, &lsr);
542 sdio_uart_check_modem_status(port);
543 if (lsr & UART_LSR_THRE)
544 sdio_uart_transmit_chars(port);
545 port->in_sdio_uart_irq = NULL;
548 static int sdio_uart_startup(struct sdio_uart_port *port)
552 struct tty_struct *tty = port->port.tty;
555 * Set the TTY IO error marker - we will only clear this
556 * once we have successfully opened the port.
558 set_bit(TTY_IO_ERROR, &tty->flags);
560 /* Initialise and allocate the transmit buffer. */
561 page = __get_free_page(GFP_KERNEL);
564 port->xmit.buf = (unsigned char *)page;
565 circ_clear(&port->xmit);
567 ret = sdio_uart_claim_func(port);
570 ret = sdio_enable_func(port->func);
573 ret = sdio_claim_irq(port->func, sdio_uart_irq);
578 * Clear the FIFO buffers and disable them.
579 * (they will be reenabled in sdio_change_speed())
581 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
582 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
583 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
584 sdio_out(port, UART_FCR, 0);
587 * Clear the interrupt registers.
589 (void) sdio_in(port, UART_LSR);
590 (void) sdio_in(port, UART_RX);
591 (void) sdio_in(port, UART_IIR);
592 (void) sdio_in(port, UART_MSR);
595 * Now, initialize the UART
597 sdio_out(port, UART_LCR, UART_LCR_WLEN8);
599 port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
600 port->mctrl = TIOCM_OUT2;
602 sdio_uart_change_speed(port, tty->termios, NULL);
604 if (tty->termios->c_cflag & CBAUD)
605 sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
607 if (tty->termios->c_cflag & CRTSCTS)
608 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS))
611 clear_bit(TTY_IO_ERROR, &port->tty->flags);
613 /* Kick the IRQ handler once while we're still holding the host lock */
614 sdio_uart_irq(port->func);
616 sdio_uart_release_func(port);
620 sdio_disable_func(port->func);
622 sdio_uart_release_func(port);
624 free_page((unsigned long)port->xmit.buf);
628 static void sdio_uart_shutdown(struct sdio_uart_port *port)
632 ret = sdio_uart_claim_func(port);
636 sdio_uart_stop_rx(port);
638 /* TODO: wait here for TX FIFO to drain */
640 /* Turn off DTR and RTS early. */
641 if (port->port.tty->termios->c_cflag & HUPCL)
642 sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
644 /* Disable interrupts from this port */
645 sdio_release_irq(port->func);
647 sdio_out(port, UART_IER, 0);
649 sdio_uart_clear_mctrl(port, TIOCM_OUT2);
651 /* Disable break condition and FIFOs. */
652 port->lcr &= ~UART_LCR_SBC;
653 sdio_out(port, UART_LCR, port->lcr);
654 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
655 UART_FCR_CLEAR_RCVR |
656 UART_FCR_CLEAR_XMIT);
657 sdio_out(port, UART_FCR, 0);
659 sdio_disable_func(port->func);
661 sdio_uart_release_func(port);
664 /* Free the transmit buffer page. */
665 free_page((unsigned long)port->xmit.buf);
668 static int sdio_uart_open(struct tty_struct *tty, struct file *filp)
670 struct sdio_uart_port *port;
673 port = sdio_uart_port_get(tty->index);
677 mutex_lock(&port->open_lock);
680 * Make sure not to mess up with a dead port
681 * which has not been closed yet.
683 if (tty->driver_data && tty->driver_data != port) {
684 mutex_unlock(&port->open_lock);
685 sdio_uart_port_put(port);
690 tty->driver_data = port;
691 port->port.tty = tty;
692 ret = sdio_uart_startup(port);
694 tty->driver_data = NULL;
695 port->port.tty = NULL;
696 mutex_unlock(&port->open_lock);
697 sdio_uart_port_put(port);
702 mutex_unlock(&port->open_lock);
706 static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
708 struct sdio_uart_port *port = tty->driver_data;
713 mutex_lock(&port->open_lock);
714 BUG_ON(!port->opened);
717 * This is messy. The tty layer calls us even when open()
718 * returned an error. Ignore this close request if tty->count
719 * is larger than port->count.
721 if (tty->count > port->opened) {
722 mutex_unlock(&port->open_lock);
726 if (--port->opened == 0) {
728 sdio_uart_shutdown(port);
729 tty_ldisc_flush(tty);
730 port->port.tty = NULL;
731 tty->driver_data = NULL;
734 mutex_unlock(&port->open_lock);
735 sdio_uart_port_put(port);
738 static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf,
741 struct sdio_uart_port *port = tty->driver_data;
742 struct circ_buf *circ = &port->xmit;
748 spin_lock(&port->write_lock);
750 c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
755 memcpy(circ->buf + circ->head, buf, c);
756 circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
761 spin_unlock(&port->write_lock);
763 if ( !(port->ier & UART_IER_THRI)) {
764 int err = sdio_uart_claim_func(port);
766 sdio_uart_start_tx(port);
767 sdio_uart_irq(port->func);
768 sdio_uart_release_func(port);
776 static int sdio_uart_write_room(struct tty_struct *tty)
778 struct sdio_uart_port *port = tty->driver_data;
779 return port ? circ_chars_free(&port->xmit) : 0;
782 static int sdio_uart_chars_in_buffer(struct tty_struct *tty)
784 struct sdio_uart_port *port = tty->driver_data;
785 return port ? circ_chars_pending(&port->xmit) : 0;
788 static void sdio_uart_send_xchar(struct tty_struct *tty, char ch)
790 struct sdio_uart_port *port = tty->driver_data;
793 if (ch && !(port->ier & UART_IER_THRI)) {
794 if (sdio_uart_claim_func(port) != 0)
796 sdio_uart_start_tx(port);
797 sdio_uart_irq(port->func);
798 sdio_uart_release_func(port);
802 static void sdio_uart_throttle(struct tty_struct *tty)
804 struct sdio_uart_port *port = tty->driver_data;
806 if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
809 if (sdio_uart_claim_func(port) != 0)
813 port->x_char = STOP_CHAR(tty);
814 sdio_uart_start_tx(port);
817 if (tty->termios->c_cflag & CRTSCTS)
818 sdio_uart_clear_mctrl(port, TIOCM_RTS);
820 sdio_uart_irq(port->func);
821 sdio_uart_release_func(port);
824 static void sdio_uart_unthrottle(struct tty_struct *tty)
826 struct sdio_uart_port *port = tty->driver_data;
828 if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
831 if (sdio_uart_claim_func(port) != 0)
838 port->x_char = START_CHAR(tty);
839 sdio_uart_start_tx(port);
843 if (tty->termios->c_cflag & CRTSCTS)
844 sdio_uart_set_mctrl(port, TIOCM_RTS);
846 sdio_uart_irq(port->func);
847 sdio_uart_release_func(port);
850 static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
852 struct sdio_uart_port *port = tty->driver_data;
853 unsigned int cflag = tty->termios->c_cflag;
855 #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
857 if ((cflag ^ old_termios->c_cflag) == 0 &&
858 RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
861 if (sdio_uart_claim_func(port) != 0)
864 sdio_uart_change_speed(port, tty->termios, old_termios);
866 /* Handle transition to B0 status */
867 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
868 sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR);
870 /* Handle transition away from B0 status */
871 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
872 unsigned int mask = TIOCM_DTR;
873 if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
875 sdio_uart_set_mctrl(port, mask);
878 /* Handle turning off CRTSCTS */
879 if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
881 sdio_uart_start_tx(port);
884 /* Handle turning on CRTSCTS */
885 if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
886 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) {
888 sdio_uart_stop_tx(port);
892 sdio_uart_release_func(port);
895 static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state)
897 struct sdio_uart_port *port = tty->driver_data;
900 result = sdio_uart_claim_func(port);
904 if (break_state == -1)
905 port->lcr |= UART_LCR_SBC;
907 port->lcr &= ~UART_LCR_SBC;
908 sdio_out(port, UART_LCR, port->lcr);
910 sdio_uart_release_func(port);
914 static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file)
916 struct sdio_uart_port *port = tty->driver_data;
919 result = sdio_uart_claim_func(port);
921 result = port->mctrl | sdio_uart_get_mctrl(port);
922 sdio_uart_release_func(port);
928 static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file,
929 unsigned int set, unsigned int clear)
931 struct sdio_uart_port *port = tty->driver_data;
934 result = sdio_uart_claim_func(port);
936 sdio_uart_update_mctrl(port, set, clear);
937 sdio_uart_release_func(port);
943 static int sdio_uart_proc_show(struct seq_file *m, void *v)
947 seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
949 for (i = 0; i < UART_NR; i++) {
950 struct sdio_uart_port *port = sdio_uart_port_get(i);
952 seq_printf(m, "%d: uart:SDIO", i);
953 if(capable(CAP_SYS_ADMIN)) {
954 seq_printf(m, " tx:%d rx:%d",
955 port->icount.tx, port->icount.rx);
956 if (port->icount.frame)
957 seq_printf(m, " fe:%d",
959 if (port->icount.parity)
960 seq_printf(m, " pe:%d",
961 port->icount.parity);
962 if (port->icount.brk)
963 seq_printf(m, " brk:%d",
965 if (port->icount.overrun)
966 seq_printf(m, " oe:%d",
967 port->icount.overrun);
968 if (port->icount.cts)
969 seq_printf(m, " cts:%d",
971 if (port->icount.dsr)
972 seq_printf(m, " dsr:%d",
974 if (port->icount.rng)
975 seq_printf(m, " rng:%d",
977 if (port->icount.dcd)
978 seq_printf(m, " dcd:%d",
981 sdio_uart_port_put(port);
988 static int sdio_uart_proc_open(struct inode *inode, struct file *file)
990 return single_open(file, sdio_uart_proc_show, NULL);
993 static const struct file_operations sdio_uart_proc_fops = {
994 .owner = THIS_MODULE,
995 .open = sdio_uart_proc_open,
998 .release = single_release,
1001 static const struct tty_operations sdio_uart_ops = {
1002 .open = sdio_uart_open,
1003 .close = sdio_uart_close,
1004 .write = sdio_uart_write,
1005 .write_room = sdio_uart_write_room,
1006 .chars_in_buffer = sdio_uart_chars_in_buffer,
1007 .send_xchar = sdio_uart_send_xchar,
1008 .throttle = sdio_uart_throttle,
1009 .unthrottle = sdio_uart_unthrottle,
1010 .set_termios = sdio_uart_set_termios,
1011 .break_ctl = sdio_uart_break_ctl,
1012 .tiocmget = sdio_uart_tiocmget,
1013 .tiocmset = sdio_uart_tiocmset,
1014 .proc_fops = &sdio_uart_proc_fops,
1017 static struct tty_driver *sdio_uart_tty_driver;
1019 static int sdio_uart_probe(struct sdio_func *func,
1020 const struct sdio_device_id *id)
1022 struct sdio_uart_port *port;
1025 port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL);
1029 if (func->class == SDIO_CLASS_UART) {
1030 printk(KERN_WARNING "%s: need info on UART class basic setup\n",
1031 sdio_func_id(func));
1034 } else if (func->class == SDIO_CLASS_GPS) {
1036 * We need tuple 0x91. It contains SUBTPL_SIOREG
1037 * and SUBTPL_RCVCAPS.
1039 struct sdio_func_tuple *tpl;
1040 for (tpl = func->tuples; tpl; tpl = tpl->next) {
1041 if (tpl->code != 0x91)
1045 if (tpl->data[1] == 0) /* SUBTPL_SIOREG */
1050 "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n",
1051 sdio_func_id(func));
1055 printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n",
1056 sdio_func_id(func), tpl->data[2], tpl->data[3]);
1057 port->regs_offset = (tpl->data[4] << 0) |
1058 (tpl->data[5] << 8) |
1059 (tpl->data[6] << 16);
1060 printk(KERN_DEBUG "%s: regs offset = 0x%x\n",
1061 sdio_func_id(func), port->regs_offset);
1062 port->uartclk = tpl->data[7] * 115200;
1063 if (port->uartclk == 0)
1064 port->uartclk = 115200;
1065 printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n",
1066 sdio_func_id(func), port->uartclk,
1067 tpl->data[7], tpl->data[8] | (tpl->data[9] << 8));
1074 sdio_set_drvdata(func, port);
1075 tty_port_init(&port->port);
1077 ret = sdio_uart_add_port(port);
1082 dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev);
1084 sdio_uart_port_remove(port);
1092 static void sdio_uart_remove(struct sdio_func *func)
1094 struct sdio_uart_port *port = sdio_get_drvdata(func);
1096 tty_unregister_device(sdio_uart_tty_driver, port->index);
1097 sdio_uart_port_remove(port);
1100 static const struct sdio_device_id sdio_uart_ids[] = {
1101 { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) },
1102 { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) },
1103 { /* end: all zeroes */ },
1106 MODULE_DEVICE_TABLE(sdio, sdio_uart_ids);
1108 static struct sdio_driver sdio_uart_driver = {
1109 .probe = sdio_uart_probe,
1110 .remove = sdio_uart_remove,
1111 .name = "sdio_uart",
1112 .id_table = sdio_uart_ids,
1115 static int __init sdio_uart_init(void)
1118 struct tty_driver *tty_drv;
1120 sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR);
1124 tty_drv->owner = THIS_MODULE;
1125 tty_drv->driver_name = "sdio_uart";
1126 tty_drv->name = "ttySDIO";
1127 tty_drv->major = 0; /* dynamically allocated */
1128 tty_drv->minor_start = 0;
1129 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1130 tty_drv->subtype = SERIAL_TYPE_NORMAL;
1131 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1132 tty_drv->init_termios = tty_std_termios;
1133 tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
1134 tty_drv->init_termios.c_ispeed = 4800;
1135 tty_drv->init_termios.c_ospeed = 4800;
1136 tty_set_operations(tty_drv, &sdio_uart_ops);
1138 ret = tty_register_driver(tty_drv);
1142 ret = sdio_register_driver(&sdio_uart_driver);
1149 tty_unregister_driver(tty_drv);
1151 put_tty_driver(tty_drv);
1155 static void __exit sdio_uart_exit(void)
1157 sdio_unregister_driver(&sdio_uart_driver);
1158 tty_unregister_driver(sdio_uart_tty_driver);
1159 put_tty_driver(sdio_uart_tty_driver);
1162 module_init(sdio_uart_init);
1163 module_exit(sdio_uart_exit);
1165 MODULE_AUTHOR("Nicolas Pitre");
1166 MODULE_LICENSE("GPL");