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/sched.h>
33 #include <linux/mutex.h>
34 #include <linux/seq_file.h>
35 #include <linux/serial_reg.h>
36 #include <linux/circ_buf.h>
37 #include <linux/gfp.h>
38 #include <linux/tty.h>
39 #include <linux/tty_flip.h>
40 #include <linux/kfifo.h>
42 #include <linux/mmc/core.h>
43 #include <linux/mmc/card.h>
44 #include <linux/mmc/sdio_func.h>
45 #include <linux/mmc/sdio_ids.h>
48 #define UART_NR 8 /* Number of UARTs this driver can handle */
51 #define FIFO_SIZE PAGE_SIZE
52 #define WAKEUP_CHARS 256
67 struct sdio_uart_port {
70 struct tty_struct *tty;
72 struct sdio_func *func;
73 struct mutex func_lock;
74 struct task_struct *in_sdio_uart_irq;
75 unsigned int regs_offset;
76 struct kfifo xmit_fifo;
77 spinlock_t write_lock;
78 struct uart_icount icount;
81 unsigned int rx_mctrl;
82 unsigned int read_status_mask;
83 unsigned int ignore_status_mask;
89 static struct sdio_uart_port *sdio_uart_table[UART_NR];
90 static DEFINE_SPINLOCK(sdio_uart_table_lock);
92 static int sdio_uart_add_port(struct sdio_uart_port *port)
94 int index, ret = -EBUSY;
96 kref_init(&port->kref);
97 mutex_init(&port->func_lock);
98 spin_lock_init(&port->write_lock);
99 if (kfifo_alloc(&port->xmit_fifo, FIFO_SIZE, GFP_KERNEL))
102 spin_lock(&sdio_uart_table_lock);
103 for (index = 0; index < UART_NR; index++) {
104 if (!sdio_uart_table[index]) {
106 sdio_uart_table[index] = port;
111 spin_unlock(&sdio_uart_table_lock);
116 static struct sdio_uart_port *sdio_uart_port_get(unsigned index)
118 struct sdio_uart_port *port;
120 if (index >= UART_NR)
123 spin_lock(&sdio_uart_table_lock);
124 port = sdio_uart_table[index];
126 kref_get(&port->kref);
127 spin_unlock(&sdio_uart_table_lock);
132 static void sdio_uart_port_destroy(struct kref *kref)
134 struct sdio_uart_port *port =
135 container_of(kref, struct sdio_uart_port, kref);
136 kfifo_free(&port->xmit_fifo);
140 static void sdio_uart_port_put(struct sdio_uart_port *port)
142 kref_put(&port->kref, sdio_uart_port_destroy);
145 static void sdio_uart_port_remove(struct sdio_uart_port *port)
147 struct sdio_func *func;
148 struct tty_struct *tty;
150 BUG_ON(sdio_uart_table[port->index] != port);
152 spin_lock(&sdio_uart_table_lock);
153 sdio_uart_table[port->index] = NULL;
154 spin_unlock(&sdio_uart_table_lock);
157 * We're killing a port that potentially still is in use by
158 * the tty layer. Be careful to prevent any further access
159 * to the SDIO function and arrange for the tty layer to
160 * give up on that port ASAP.
161 * Beware: the lock ordering is critical.
163 mutex_lock(&port->port.mutex);
164 mutex_lock(&port->func_lock);
166 sdio_claim_host(func);
168 mutex_unlock(&port->func_lock);
169 tty = tty_port_tty_get(&port->port);
170 /* tty_hangup is async so is this safe as is ?? */
175 mutex_unlock(&port->port.mutex);
176 sdio_release_irq(func);
177 sdio_disable_func(func);
178 sdio_release_host(func);
180 sdio_uart_port_put(port);
183 static int sdio_uart_claim_func(struct sdio_uart_port *port)
185 mutex_lock(&port->func_lock);
186 if (unlikely(!port->func)) {
187 mutex_unlock(&port->func_lock);
190 if (likely(port->in_sdio_uart_irq != current))
191 sdio_claim_host(port->func);
192 mutex_unlock(&port->func_lock);
196 static inline void sdio_uart_release_func(struct sdio_uart_port *port)
198 if (likely(port->in_sdio_uart_irq != current))
199 sdio_release_host(port->func);
202 static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
205 c = sdio_readb(port->func, port->regs_offset + offset, NULL);
209 static inline void sdio_out(struct sdio_uart_port *port, int offset, int value)
211 sdio_writeb(port->func, value, port->regs_offset + offset, NULL);
214 static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port)
216 unsigned char status;
219 /* FIXME: What stops this losing the delta bits and breaking
220 sdio_uart_check_modem_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 = tty_port_tty_get(&port->port);
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)
433 tty_insert_flip_char(tty, ch, flag);
436 * Overrun is special. Since it's reported immediately,
437 * it doesn't affect the current character.
439 if (*status & ~port->ignore_status_mask & UART_LSR_OE)
441 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
443 *status = sdio_in(port, UART_LSR);
444 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
446 tty_flip_buffer_push(tty);
451 static void sdio_uart_transmit_chars(struct sdio_uart_port *port)
453 struct kfifo *xmit = &port->xmit_fifo;
455 struct tty_struct *tty;
460 sdio_out(port, UART_TX, port->x_char);
466 tty = tty_port_tty_get(&port->port);
468 if (tty == NULL || !kfifo_len(xmit) ||
469 tty->stopped || tty->hw_stopped) {
470 sdio_uart_stop_tx(port);
475 len = kfifo_out_locked(xmit, iobuf, 16, &port->write_lock);
476 for (count = 0; count < len; count++) {
477 sdio_out(port, UART_TX, iobuf[count]);
481 len = kfifo_len(xmit);
482 if (len < WAKEUP_CHARS) {
485 sdio_uart_stop_tx(port);
490 static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
493 struct tty_struct *tty;
495 status = sdio_in(port, UART_MSR);
497 if ((status & UART_MSR_ANY_DELTA) == 0)
500 if (status & UART_MSR_TERI)
502 if (status & UART_MSR_DDSR)
504 if (status & UART_MSR_DDCD) {
506 /* DCD raise - wake for open */
507 if (status & UART_MSR_DCD)
508 wake_up_interruptible(&port->port.open_wait);
510 /* DCD drop - hang up if tty attached */
511 tty = tty_port_tty_get(&port->port);
518 if (status & UART_MSR_DCTS) {
520 tty = tty_port_tty_get(&port->port);
521 if (tty && (tty->termios->c_cflag & CRTSCTS)) {
522 int cts = (status & UART_MSR_CTS);
523 if (tty->hw_stopped) {
526 sdio_uart_start_tx(port);
532 sdio_uart_stop_tx(port);
541 * This handles the interrupt from one port.
543 static void sdio_uart_irq(struct sdio_func *func)
545 struct sdio_uart_port *port = sdio_get_drvdata(func);
546 unsigned int iir, lsr;
549 * In a few places sdio_uart_irq() is called directly instead of
550 * waiting for the actual interrupt to be raised and the SDIO IRQ
551 * thread scheduled in order to reduce latency. However, some
552 * interaction with the tty core may end up calling us back
553 * (serial echo, flow control, etc.) through those same places
554 * causing undesirable effects. Let's stop the recursion here.
556 if (unlikely(port->in_sdio_uart_irq == current))
559 iir = sdio_in(port, UART_IIR);
560 if (iir & UART_IIR_NO_INT)
563 port->in_sdio_uart_irq = current;
564 lsr = sdio_in(port, UART_LSR);
565 if (lsr & UART_LSR_DR)
566 sdio_uart_receive_chars(port, &lsr);
567 sdio_uart_check_modem_status(port);
568 if (lsr & UART_LSR_THRE)
569 sdio_uart_transmit_chars(port);
570 port->in_sdio_uart_irq = NULL;
573 static int uart_carrier_raised(struct tty_port *tport)
575 struct sdio_uart_port *port =
576 container_of(tport, struct sdio_uart_port, port);
577 unsigned int ret = sdio_uart_claim_func(port);
578 if (ret) /* Missing hardware shouldn't block for carrier */
580 ret = sdio_uart_get_mctrl(port);
581 sdio_uart_release_func(port);
588 * uart_dtr_rts - port helper to set uart signals
589 * @tport: tty port to be updated
590 * @onoff: set to turn on DTR/RTS
592 * Called by the tty port helpers when the modem signals need to be
593 * adjusted during an open, close and hangup.
596 static void uart_dtr_rts(struct tty_port *tport, int onoff)
598 struct sdio_uart_port *port =
599 container_of(tport, struct sdio_uart_port, port);
600 int ret = sdio_uart_claim_func(port);
604 sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
606 sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
607 sdio_uart_release_func(port);
611 * sdio_uart_activate - start up hardware
612 * @tport: tty port to activate
613 * @tty: tty bound to this port
615 * Activate a tty port. The port locking guarantees us this will be
616 * run exactly once per set of opens, and if successful will see the
617 * shutdown method run exactly once to match. Start up and shutdown are
618 * protected from each other by the internal locking and will not run
619 * at the same time even during a hangup event.
621 * If we successfully start up the port we take an extra kref as we
622 * will keep it around until shutdown when the kref is dropped.
625 static int sdio_uart_activate(struct tty_port *tport, struct tty_struct *tty)
627 struct sdio_uart_port *port =
628 container_of(tport, struct sdio_uart_port, port);
632 * Set the TTY IO error marker - we will only clear this
633 * once we have successfully opened the port.
635 set_bit(TTY_IO_ERROR, &tty->flags);
637 kfifo_reset(&port->xmit_fifo);
639 ret = sdio_uart_claim_func(port);
642 ret = sdio_enable_func(port->func);
645 ret = sdio_claim_irq(port->func, sdio_uart_irq);
650 * Clear the FIFO buffers and disable them.
651 * (they will be reenabled in sdio_change_speed())
653 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
654 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
655 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
656 sdio_out(port, UART_FCR, 0);
659 * Clear the interrupt registers.
661 (void) sdio_in(port, UART_LSR);
662 (void) sdio_in(port, UART_RX);
663 (void) sdio_in(port, UART_IIR);
664 (void) sdio_in(port, UART_MSR);
667 * Now, initialize the UART
669 sdio_out(port, UART_LCR, UART_LCR_WLEN8);
671 port->ier = UART_IER_RLSI|UART_IER_RDI|UART_IER_RTOIE|UART_IER_UUE;
672 port->mctrl = TIOCM_OUT2;
674 sdio_uart_change_speed(port, tty->termios, NULL);
676 if (tty->termios->c_cflag & CBAUD)
677 sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
679 if (tty->termios->c_cflag & CRTSCTS)
680 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS))
683 clear_bit(TTY_IO_ERROR, &tty->flags);
685 /* Kick the IRQ handler once while we're still holding the host lock */
686 sdio_uart_irq(port->func);
688 sdio_uart_release_func(port);
692 sdio_disable_func(port->func);
694 sdio_uart_release_func(port);
699 * sdio_uart_shutdown - stop hardware
700 * @tport: tty port to shut down
702 * Deactivate a tty port. The port locking guarantees us this will be
703 * run only if a successful matching activate already ran. The two are
704 * protected from each other by the internal locking and will not run
705 * at the same time even during a hangup event.
708 static void sdio_uart_shutdown(struct tty_port *tport)
710 struct sdio_uart_port *port =
711 container_of(tport, struct sdio_uart_port, port);
714 ret = sdio_uart_claim_func(port);
718 sdio_uart_stop_rx(port);
720 /* Disable interrupts from this port */
721 sdio_release_irq(port->func);
723 sdio_out(port, UART_IER, 0);
725 sdio_uart_clear_mctrl(port, TIOCM_OUT2);
727 /* Disable break condition and FIFOs. */
728 port->lcr &= ~UART_LCR_SBC;
729 sdio_out(port, UART_LCR, port->lcr);
730 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
731 UART_FCR_CLEAR_RCVR |
732 UART_FCR_CLEAR_XMIT);
733 sdio_out(port, UART_FCR, 0);
735 sdio_disable_func(port->func);
737 sdio_uart_release_func(port);
741 * sdio_uart_install - install method
742 * @driver: the driver in use (sdio_uart in our case)
743 * @tty: the tty being bound
745 * Look up and bind the tty and the driver together. Initialize
746 * any needed private data (in our case the termios)
749 static int sdio_uart_install(struct tty_driver *driver, struct tty_struct *tty)
751 int idx = tty->index;
752 struct sdio_uart_port *port = sdio_uart_port_get(idx);
753 int ret = tty_init_termios(tty);
756 tty_driver_kref_get(driver);
758 /* This is the ref sdio_uart_port get provided */
759 tty->driver_data = port;
760 driver->ttys[idx] = tty;
762 sdio_uart_port_put(port);
767 * sdio_uart_cleanup - called on the last tty kref drop
768 * @tty: the tty being destroyed
770 * Called asynchronously when the last reference to the tty is dropped.
771 * We cannot destroy the tty->driver_data port kref until this point
774 static void sdio_uart_cleanup(struct tty_struct *tty)
776 struct sdio_uart_port *port = tty->driver_data;
777 tty->driver_data = NULL; /* Bug trap */
778 sdio_uart_port_put(port);
782 * Open/close/hangup is now entirely boilerplate
785 static int sdio_uart_open(struct tty_struct *tty, struct file *filp)
787 struct sdio_uart_port *port = tty->driver_data;
788 return tty_port_open(&port->port, tty, filp);
791 static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
793 struct sdio_uart_port *port = tty->driver_data;
794 tty_port_close(&port->port, tty, filp);
797 static void sdio_uart_hangup(struct tty_struct *tty)
799 struct sdio_uart_port *port = tty->driver_data;
800 tty_port_hangup(&port->port);
803 static int sdio_uart_write(struct tty_struct *tty, const unsigned char *buf,
806 struct sdio_uart_port *port = tty->driver_data;
812 ret = kfifo_in_locked(&port->xmit_fifo, buf, count, &port->write_lock);
813 if (!(port->ier & UART_IER_THRI)) {
814 int err = sdio_uart_claim_func(port);
816 sdio_uart_start_tx(port);
817 sdio_uart_irq(port->func);
818 sdio_uart_release_func(port);
826 static int sdio_uart_write_room(struct tty_struct *tty)
828 struct sdio_uart_port *port = tty->driver_data;
829 return FIFO_SIZE - kfifo_len(&port->xmit_fifo);
832 static int sdio_uart_chars_in_buffer(struct tty_struct *tty)
834 struct sdio_uart_port *port = tty->driver_data;
835 return kfifo_len(&port->xmit_fifo);
838 static void sdio_uart_send_xchar(struct tty_struct *tty, char ch)
840 struct sdio_uart_port *port = tty->driver_data;
843 if (ch && !(port->ier & UART_IER_THRI)) {
844 if (sdio_uart_claim_func(port) != 0)
846 sdio_uart_start_tx(port);
847 sdio_uart_irq(port->func);
848 sdio_uart_release_func(port);
852 static void sdio_uart_throttle(struct tty_struct *tty)
854 struct sdio_uart_port *port = tty->driver_data;
856 if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
859 if (sdio_uart_claim_func(port) != 0)
863 port->x_char = STOP_CHAR(tty);
864 sdio_uart_start_tx(port);
867 if (tty->termios->c_cflag & CRTSCTS)
868 sdio_uart_clear_mctrl(port, TIOCM_RTS);
870 sdio_uart_irq(port->func);
871 sdio_uart_release_func(port);
874 static void sdio_uart_unthrottle(struct tty_struct *tty)
876 struct sdio_uart_port *port = tty->driver_data;
878 if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
881 if (sdio_uart_claim_func(port) != 0)
888 port->x_char = START_CHAR(tty);
889 sdio_uart_start_tx(port);
893 if (tty->termios->c_cflag & CRTSCTS)
894 sdio_uart_set_mctrl(port, TIOCM_RTS);
896 sdio_uart_irq(port->func);
897 sdio_uart_release_func(port);
900 static void sdio_uart_set_termios(struct tty_struct *tty,
901 struct ktermios *old_termios)
903 struct sdio_uart_port *port = tty->driver_data;
904 unsigned int cflag = tty->termios->c_cflag;
906 if (sdio_uart_claim_func(port) != 0)
909 sdio_uart_change_speed(port, tty->termios, old_termios);
911 /* Handle transition to B0 status */
912 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
913 sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR);
915 /* Handle transition away from B0 status */
916 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
917 unsigned int mask = TIOCM_DTR;
918 if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
920 sdio_uart_set_mctrl(port, mask);
923 /* Handle turning off CRTSCTS */
924 if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
926 sdio_uart_start_tx(port);
929 /* Handle turning on CRTSCTS */
930 if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
931 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) {
933 sdio_uart_stop_tx(port);
937 sdio_uart_release_func(port);
940 static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state)
942 struct sdio_uart_port *port = tty->driver_data;
945 result = sdio_uart_claim_func(port);
949 if (break_state == -1)
950 port->lcr |= UART_LCR_SBC;
952 port->lcr &= ~UART_LCR_SBC;
953 sdio_out(port, UART_LCR, port->lcr);
955 sdio_uart_release_func(port);
959 static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file)
961 struct sdio_uart_port *port = tty->driver_data;
964 result = sdio_uart_claim_func(port);
966 result = port->mctrl | sdio_uart_get_mctrl(port);
967 sdio_uart_release_func(port);
973 static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file,
974 unsigned int set, unsigned int clear)
976 struct sdio_uart_port *port = tty->driver_data;
979 result = sdio_uart_claim_func(port);
981 sdio_uart_update_mctrl(port, set, clear);
982 sdio_uart_release_func(port);
988 static int sdio_uart_proc_show(struct seq_file *m, void *v)
992 seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
994 for (i = 0; i < UART_NR; i++) {
995 struct sdio_uart_port *port = sdio_uart_port_get(i);
997 seq_printf(m, "%d: uart:SDIO", i);
998 if (capable(CAP_SYS_ADMIN)) {
999 seq_printf(m, " tx:%d rx:%d",
1000 port->icount.tx, port->icount.rx);
1001 if (port->icount.frame)
1002 seq_printf(m, " fe:%d",
1003 port->icount.frame);
1004 if (port->icount.parity)
1005 seq_printf(m, " pe:%d",
1006 port->icount.parity);
1007 if (port->icount.brk)
1008 seq_printf(m, " brk:%d",
1010 if (port->icount.overrun)
1011 seq_printf(m, " oe:%d",
1012 port->icount.overrun);
1013 if (port->icount.cts)
1014 seq_printf(m, " cts:%d",
1016 if (port->icount.dsr)
1017 seq_printf(m, " dsr:%d",
1019 if (port->icount.rng)
1020 seq_printf(m, " rng:%d",
1022 if (port->icount.dcd)
1023 seq_printf(m, " dcd:%d",
1026 sdio_uart_port_put(port);
1033 static int sdio_uart_proc_open(struct inode *inode, struct file *file)
1035 return single_open(file, sdio_uart_proc_show, NULL);
1038 static const struct file_operations sdio_uart_proc_fops = {
1039 .owner = THIS_MODULE,
1040 .open = sdio_uart_proc_open,
1042 .llseek = seq_lseek,
1043 .release = single_release,
1046 static const struct tty_port_operations sdio_uart_port_ops = {
1047 .dtr_rts = uart_dtr_rts,
1048 .carrier_raised = uart_carrier_raised,
1049 .shutdown = sdio_uart_shutdown,
1050 .activate = sdio_uart_activate,
1053 static const struct tty_operations sdio_uart_ops = {
1054 .open = sdio_uart_open,
1055 .close = sdio_uart_close,
1056 .write = sdio_uart_write,
1057 .write_room = sdio_uart_write_room,
1058 .chars_in_buffer = sdio_uart_chars_in_buffer,
1059 .send_xchar = sdio_uart_send_xchar,
1060 .throttle = sdio_uart_throttle,
1061 .unthrottle = sdio_uart_unthrottle,
1062 .set_termios = sdio_uart_set_termios,
1063 .hangup = sdio_uart_hangup,
1064 .break_ctl = sdio_uart_break_ctl,
1065 .tiocmget = sdio_uart_tiocmget,
1066 .tiocmset = sdio_uart_tiocmset,
1067 .install = sdio_uart_install,
1068 .cleanup = sdio_uart_cleanup,
1069 .proc_fops = &sdio_uart_proc_fops,
1072 static struct tty_driver *sdio_uart_tty_driver;
1074 static int sdio_uart_probe(struct sdio_func *func,
1075 const struct sdio_device_id *id)
1077 struct sdio_uart_port *port;
1080 port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL);
1084 if (func->class == SDIO_CLASS_UART) {
1085 printk(KERN_WARNING "%s: need info on UART class basic setup\n",
1086 sdio_func_id(func));
1089 } else if (func->class == SDIO_CLASS_GPS) {
1091 * We need tuple 0x91. It contains SUBTPL_SIOREG
1092 * and SUBTPL_RCVCAPS.
1094 struct sdio_func_tuple *tpl;
1095 for (tpl = func->tuples; tpl; tpl = tpl->next) {
1096 if (tpl->code != 0x91)
1100 if (tpl->data[1] == 0) /* SUBTPL_SIOREG */
1105 "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n",
1106 sdio_func_id(func));
1110 printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n",
1111 sdio_func_id(func), tpl->data[2], tpl->data[3]);
1112 port->regs_offset = (tpl->data[4] << 0) |
1113 (tpl->data[5] << 8) |
1114 (tpl->data[6] << 16);
1115 printk(KERN_DEBUG "%s: regs offset = 0x%x\n",
1116 sdio_func_id(func), port->regs_offset);
1117 port->uartclk = tpl->data[7] * 115200;
1118 if (port->uartclk == 0)
1119 port->uartclk = 115200;
1120 printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n",
1121 sdio_func_id(func), port->uartclk,
1122 tpl->data[7], tpl->data[8] | (tpl->data[9] << 8));
1129 sdio_set_drvdata(func, port);
1130 tty_port_init(&port->port);
1131 port->port.ops = &sdio_uart_port_ops;
1133 ret = sdio_uart_add_port(port);
1138 dev = tty_register_device(sdio_uart_tty_driver,
1139 port->index, &func->dev);
1141 sdio_uart_port_remove(port);
1149 static void sdio_uart_remove(struct sdio_func *func)
1151 struct sdio_uart_port *port = sdio_get_drvdata(func);
1153 tty_unregister_device(sdio_uart_tty_driver, port->index);
1154 sdio_uart_port_remove(port);
1157 static const struct sdio_device_id sdio_uart_ids[] = {
1158 { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) },
1159 { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) },
1160 { /* end: all zeroes */ },
1163 MODULE_DEVICE_TABLE(sdio, sdio_uart_ids);
1165 static struct sdio_driver sdio_uart_driver = {
1166 .probe = sdio_uart_probe,
1167 .remove = sdio_uart_remove,
1168 .name = "sdio_uart",
1169 .id_table = sdio_uart_ids,
1172 static int __init sdio_uart_init(void)
1175 struct tty_driver *tty_drv;
1177 sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR);
1181 tty_drv->owner = THIS_MODULE;
1182 tty_drv->driver_name = "sdio_uart";
1183 tty_drv->name = "ttySDIO";
1184 tty_drv->major = 0; /* dynamically allocated */
1185 tty_drv->minor_start = 0;
1186 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1187 tty_drv->subtype = SERIAL_TYPE_NORMAL;
1188 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1189 tty_drv->init_termios = tty_std_termios;
1190 tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
1191 tty_drv->init_termios.c_ispeed = 4800;
1192 tty_drv->init_termios.c_ospeed = 4800;
1193 tty_set_operations(tty_drv, &sdio_uart_ops);
1195 ret = tty_register_driver(tty_drv);
1199 ret = sdio_register_driver(&sdio_uart_driver);
1206 tty_unregister_driver(tty_drv);
1208 put_tty_driver(tty_drv);
1212 static void __exit sdio_uart_exit(void)
1214 sdio_unregister_driver(&sdio_uart_driver);
1215 tty_unregister_driver(sdio_uart_tty_driver);
1216 put_tty_driver(sdio_uart_tty_driver);
1219 module_init(sdio_uart_init);
1220 module_exit(sdio_uart_exit);
1222 MODULE_AUTHOR("Nicolas Pitre");
1223 MODULE_LICENSE("GPL");