1 // SPDX-License-Identifier: GPL-2.0
19  * o	The driver is intended to be big-endian safe but has never been
26 #include <linux/dma-mapping.h>
60 #define IFX_SPI_HEADER_0		(-1)
61 #define IFX_SPI_HEADER_F		(-2)
83 	gpiod_set_value(ifx_dev->gpio.pmu_reset, 1);  in ifx_modem_power_off()
103  *	mrdy_set_high		-	set MRDY GPIO
109 	gpiod_set_value(ifx->gpio.mrdy, 1);  in mrdy_set_high()
113  *	mrdy_set_low		-	clear MRDY GPIO
119 	gpiod_set_value(ifx->gpio.mrdy, 0);  in mrdy_set_low()
127  *	Set bit in power status and signal power system if status becomes non-0
134 	spin_lock_irqsave(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_set()
137 	 * if power status is already non-0, just update, else  in ifx_spi_power_state_set()
140 	if (!ifx_dev->power_status)  in ifx_spi_power_state_set()
141 		pm_runtime_get(&ifx_dev->spi_dev->dev);  in ifx_spi_power_state_set()
142 	ifx_dev->power_status |= val;  in ifx_spi_power_state_set()
144 	spin_unlock_irqrestore(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_set()
148  *	ifx_spi_power_state_clear	-	clear power bit
159 	spin_lock_irqsave(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_clear()
161 	if (ifx_dev->power_status) {  in ifx_spi_power_state_clear()
162 		ifx_dev->power_status &= ~val;  in ifx_spi_power_state_clear()
163 		if (!ifx_dev->power_status)  in ifx_spi_power_state_clear()
164 			pm_runtime_put(&ifx_dev->spi_dev->dev);  in ifx_spi_power_state_clear()
167 	spin_unlock_irqrestore(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_clear()
176  *	Swap the contents of a buffer into big endian format
180 	/* don't swap buffer if SPI word width is 8 bits */  in swap_buf_8()
190  *	Swap the contents of a buffer into big endian format
199 		pr_err("swap_buf_16: swap exceeds boundary (%p > %p)!",  in swap_buf_16()
215  *	Swap the contents of a buffer into big endian format
225 		pr_err("swap_buf_32: swap exceeds boundary (%p > %p)!\n",  in swap_buf_32()
236  *	mrdy_assert		-	assert MRDY line
246 	int val = gpiod_get_value(ifx_dev->gpio.srdy);  in mrdy_assert()
249 				      &ifx_dev->flags)) {  in mrdy_assert()
250 			mod_timer(&ifx_dev->spi_timer,jiffies + IFX_SPI_TIMEOUT_SEC*HZ);  in mrdy_assert()
259  *	ifx_spi_timeout		-	SPI timeout
269 	dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");  in ifx_spi_timeout()
270 	tty_port_tty_hangup(&ifx_dev->tty_port, false);  in ifx_spi_timeout()
272 	clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);  in ifx_spi_timeout()
278  *	ifx_spi_tiocmget	-	get modem lines
287 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_tiocmget()
290 	(test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |  in ifx_spi_tiocmget()
291 	(test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |  in ifx_spi_tiocmget()
292 	(test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |  in ifx_spi_tiocmget()
293 	(test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |  in ifx_spi_tiocmget()
294 	(test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |  in ifx_spi_tiocmget()
295 	(test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);  in ifx_spi_tiocmget()
300  *	ifx_spi_tiocmset	-	set modem bits
305  *	The IFX6x60 only supports DTR and RTS. Set them accordingly
313 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_tiocmset()
316 		set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
318 		set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
320 		clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
322 		clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
324 	set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
329  *	ifx_spi_open	-	called on tty open
340 	return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);  in ifx_spi_open()
344  *	ifx_spi_close	-	called when our tty closes
353 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_close()
354 	tty_port_close(&ifx_dev->tty_port, tty, filp);  in ifx_spi_close()
359  *	ifx_decode_spi_header	-	decode received header
363  *	@received_cts: status of cts we received
365  *	Note how received_cts is handled -- if header is all F it is left
398  *	ifx_setup_spi_header	-	set header fields
416  *	ifx_spi_prepare_tx_buffer	-	prepare transmit frame
422  *	ifx_dev->tx_buffer
424  *	FIXME: performance - should we wake the tty when the queue is half
434 	tx_buffer = ifx_dev->tx_buffer;  in ifx_spi_prepare_tx_buffer()
442 	ifx_dev->spi_more = 0;  in ifx_spi_prepare_tx_buffer()
444 	/* if modem cts is set, just send empty buffer */  in ifx_spi_prepare_tx_buffer()
445 	if (!ifx_dev->spi_slave_cts) {  in ifx_spi_prepare_tx_buffer()
447 		queue_length = kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_prepare_tx_buffer()
449 			/* data to mux -- see if there's room for it */  in ifx_spi_prepare_tx_buffer()
451 			temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,  in ifx_spi_prepare_tx_buffer()
453 					&ifx_dev->fifo_lock);  in ifx_spi_prepare_tx_buffer()
460 				tty_port_tty_wakeup(&ifx_dev->tty_port);  in ifx_spi_prepare_tx_buffer()
462 				ifx_dev->spi_more = 1;  in ifx_spi_prepare_tx_buffer()
465 	/* have data and info for header -- set up SPI header in buffer */  in ifx_spi_prepare_tx_buffer()
467 	ifx_spi_setup_spi_header(ifx_dev->tx_buffer,  in ifx_spi_prepare_tx_buffer()
468 					tx_count-IFX_SPI_HEADER_OVERHEAD,  in ifx_spi_prepare_tx_buffer()
469 					ifx_dev->spi_more);  in ifx_spi_prepare_tx_buffer()
470 	/* swap actual data in the buffer */  in ifx_spi_prepare_tx_buffer()
471 	ifx_dev->swap_buf((ifx_dev->tx_buffer), tx_count,  in ifx_spi_prepare_tx_buffer()
472 		&ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);  in ifx_spi_prepare_tx_buffer()
477  *	ifx_spi_write		-	line discipline write
489 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_write()
495 	spin_lock_irqsave(&ifx_dev->fifo_lock, flags);  in ifx_spi_write()
496 	is_fifo_empty = kfifo_is_empty(&ifx_dev->tx_fifo);  in ifx_spi_write()
497 	tx_count = kfifo_in(&ifx_dev->tx_fifo, tmp_buf, count);  in ifx_spi_write()
498 	spin_unlock_irqrestore(&ifx_dev->fifo_lock, flags);  in ifx_spi_write()
506  *	ifx_spi_chars_in_buffer	-	line discipline helper
514 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_write_room()
515 	return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_write_room()
519  *	ifx_spi_chars_in_buffer	-	line discipline helper
527 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_chars_in_buffer()
528 	return kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_chars_in_buffer()
541 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_hangup()
542 	tty_port_hangup(&ifx_dev->tty_port);  in ifx_spi_hangup()
549  *	tty port activate method - called for first open. Serialized
558 	kfifo_reset(&ifx_dev->tx_fifo);  in ifx_port_activate()
561 	clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);  in ifx_port_activate()
562 	clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);  in ifx_port_activate()
565 	tty->driver_data = ifx_dev;  in ifx_port_activate()
568 	port->low_latency = 1;  in ifx_port_activate()
571 	set_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags);  in ifx_port_activate()
580  *	tty port shutdown method - called for last port close. Serialized
588 	clear_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags);  in ifx_port_shutdown()
590 	del_timer(&ifx_dev->spi_timer);  in ifx_port_shutdown()
591 	clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);  in ifx_port_shutdown()
592 	tasklet_kill(&ifx_dev->io_work_tasklet);  in ifx_port_shutdown()
612  *	ifx_spi_insert_fip_string	-	queue received data
623 	tty_insert_flip_string(&ifx_dev->tty_port, chars, size);  in ifx_spi_insert_flip_string()
624 	tty_flip_buffer_push(&ifx_dev->tty_port);  in ifx_spi_insert_flip_string()
628  *	ifx_spi_complete	-	SPI transfer completed
640 	unsigned char cts;  in ifx_spi_complete()  local
648 	if (!ifx_dev->spi_msg.status) {  in ifx_spi_complete()
650 		ifx_dev->swap_buf(ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,  in ifx_spi_complete()
651 			&ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);  in ifx_spi_complete()
652 		decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,  in ifx_spi_complete()
653 				&length, &more, &cts);  in ifx_spi_complete()
655 			dev_dbg(&ifx_dev->spi_dev->dev,  in ifx_spi_complete()
657 			ifx_dev->spi_slave_cts = 0;  in ifx_spi_complete()
660 			dev_dbg(&ifx_dev->spi_dev->dev,  in ifx_spi_complete()
665 		ifx_dev->spi_slave_cts = cts;  in ifx_spi_complete()
668 					ifx_dev->spi_msg.actual_length);  in ifx_spi_complete()
669 		ifx_dev->swap_buf(  in ifx_spi_complete()
670 			(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),  in ifx_spi_complete()
672 			 &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);  in ifx_spi_complete()
675 			ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,  in ifx_spi_complete()
679 		dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",  in ifx_spi_complete()
680 		       ifx_dev->spi_msg.status);  in ifx_spi_complete()
684 	if (ifx_dev->write_pending) {  in ifx_spi_complete()
685 		ifx_dev->write_pending = 0;  in ifx_spi_complete()
689 	clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));  in ifx_spi_complete()
691 	queue_length = kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_complete()
692 	srdy = gpiod_get_value(ifx_dev->gpio.srdy);  in ifx_spi_complete()
697 	if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))  in ifx_spi_complete()
698 		tasklet_schedule(&ifx_dev->io_work_tasklet);  in ifx_spi_complete()
700 		if (more || ifx_dev->spi_more || queue_length > 0 ||  in ifx_spi_complete()
702 			if (ifx_dev->spi_slave_cts) {  in ifx_spi_complete()
715 			tty_port_tty_wakeup(&ifx_dev->tty_port);  in ifx_spi_complete()
721  *	ifx_spio_io		-	I/O tasklet
733 	if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags) &&  in ifx_spi_io()
734 		test_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags)) {  in ifx_spi_io()
735 		if (ifx_dev->gpio.unack_srdy_int_nb > 0)  in ifx_spi_io()
736 			ifx_dev->gpio.unack_srdy_int_nb--;  in ifx_spi_io()
740 		spi_message_init(&ifx_dev->spi_msg);  in ifx_spi_io()
741 		INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);  in ifx_spi_io()
743 		ifx_dev->spi_msg.context = ifx_dev;  in ifx_spi_io()
744 		ifx_dev->spi_msg.complete = ifx_spi_complete;  in ifx_spi_io()
748 		ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;  in ifx_spi_io()
749 		ifx_dev->spi_xfer.cs_change = 0;  in ifx_spi_io()
750 		ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz;  in ifx_spi_io()
751 		/* ifx_dev->spi_xfer.speed_hz = 390625; */  in ifx_spi_io()
752 		ifx_dev->spi_xfer.bits_per_word =  in ifx_spi_io()
753 			ifx_dev->spi_dev->bits_per_word;  in ifx_spi_io()
755 		ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;  in ifx_spi_io()
756 		ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;  in ifx_spi_io()
761 		if (ifx_dev->use_dma) {  in ifx_spi_io()
762 			ifx_dev->spi_msg.is_dma_mapped = 1;  in ifx_spi_io()
763 			ifx_dev->tx_dma = ifx_dev->tx_bus;  in ifx_spi_io()
764 			ifx_dev->rx_dma = ifx_dev->rx_bus;  in ifx_spi_io()
765 			ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;  in ifx_spi_io()
766 			ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;  in ifx_spi_io()
768 			ifx_dev->spi_msg.is_dma_mapped = 0;  in ifx_spi_io()
769 			ifx_dev->tx_dma = (dma_addr_t)0;  in ifx_spi_io()
770 			ifx_dev->rx_dma = (dma_addr_t)0;  in ifx_spi_io()
771 			ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;  in ifx_spi_io()
772 			ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;  in ifx_spi_io()
775 		spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);  in ifx_spi_io()
782 		retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);  in ifx_spi_io()
785 				  &ifx_dev->flags);  in ifx_spi_io()
786 			tasklet_schedule(&ifx_dev->io_work_tasklet);  in ifx_spi_io()
790 		ifx_dev->write_pending = 1;  in ifx_spi_io()
794  *	ifx_spi_free_port	-	free up the tty side
801 	if (ifx_dev->tty_dev)  in ifx_spi_free_port()
802 		tty_unregister_device(tty_drv, ifx_dev->minor);  in ifx_spi_free_port()
803 	tty_port_destroy(&ifx_dev->tty_port);  in ifx_spi_free_port()
804 	kfifo_free(&ifx_dev->tx_fifo);  in ifx_spi_free_port()
808  *	ifx_spi_create_port	-	create a new port
817 	struct tty_port *pport = &ifx_dev->tty_port;  in ifx_spi_create_port()
819 	spin_lock_init(&ifx_dev->fifo_lock);  in ifx_spi_create_port()
820 	lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,  in ifx_spi_create_port()
823 	if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {  in ifx_spi_create_port()
824 		ret = -ENOMEM;  in ifx_spi_create_port()
829 	pport->ops = &ifx_tty_port_ops;  in ifx_spi_create_port()
830 	ifx_dev->minor = IFX_SPI_TTY_ID;  in ifx_spi_create_port()
831 	ifx_dev->tty_dev = tty_port_register_device(pport, tty_drv,  in ifx_spi_create_port()
832 			ifx_dev->minor, &ifx_dev->spi_dev->dev);  in ifx_spi_create_port()
833 	if (IS_ERR(ifx_dev->tty_dev)) {  in ifx_spi_create_port()
834 		dev_dbg(&ifx_dev->spi_dev->dev,  in ifx_spi_create_port()
836 		ret = PTR_ERR(ifx_dev->tty_dev);  in ifx_spi_create_port()
849  *	ifx_spi_handle_srdy		-	handle SRDY
858 	if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {  in ifx_spi_handle_srdy()
859 		del_timer(&ifx_dev->spi_timer);  in ifx_spi_handle_srdy()
860 		clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);  in ifx_spi_handle_srdy()
865 	if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))  in ifx_spi_handle_srdy()
866 		tasklet_schedule(&ifx_dev->io_work_tasklet);  in ifx_spi_handle_srdy()
868 		set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);  in ifx_spi_handle_srdy()
872  *	ifx_spi_srdy_interrupt	-	SRDY asserted
881 	ifx_dev->gpio.unack_srdy_int_nb++;  in ifx_spi_srdy_interrupt()
887  *	ifx_spi_reset_interrupt	-	Modem has changed reset state
900 	int val = gpiod_get_value(ifx_dev->gpio.reset_out);  in ifx_spi_reset_interrupt()
901 	int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
905 		set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
908 			tty_port_tty_hangup(&ifx_dev->tty_port, false);  in ifx_spi_reset_interrupt()
912 		clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
914 			set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
915 			wake_up(&ifx_dev->mdm_reset_wait);  in ifx_spi_reset_interrupt()
922  *	ifx_spi_free_device - free device
930 	dma_free_coherent(&ifx_dev->spi_dev->dev,  in ifx_spi_free_device()
932 				ifx_dev->tx_buffer,  in ifx_spi_free_device()
933 				ifx_dev->tx_bus);  in ifx_spi_free_device()
934 	dma_free_coherent(&ifx_dev->spi_dev->dev,  in ifx_spi_free_device()
936 				ifx_dev->rx_buffer,  in ifx_spi_free_device()
937 				ifx_dev->rx_bus);  in ifx_spi_free_device()
941  *	ifx_spi_reset	-	reset modem
955 	set_bit(MR_START, &ifx_dev->mdm_reset_state);  in ifx_spi_reset()
956 	gpiod_set_value(ifx_dev->gpio.po, 0);  in ifx_spi_reset()
957 	gpiod_set_value(ifx_dev->gpio.reset, 0);  in ifx_spi_reset()
959 	gpiod_set_value(ifx_dev->gpio.reset, 1);  in ifx_spi_reset()
961 	gpiod_set_value(ifx_dev->gpio.po, 1);  in ifx_spi_reset()
963 	gpiod_set_value(ifx_dev->gpio.po, 0);  in ifx_spi_reset()
964 	ret = wait_event_timeout(ifx_dev->mdm_reset_wait,  in ifx_spi_reset()
966 					  &ifx_dev->mdm_reset_state),  in ifx_spi_reset()
969 		dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",  in ifx_spi_reset()
970 			 ifx_dev->mdm_reset_state);  in ifx_spi_reset()
972 	ifx_dev->mdm_reset_state = 0;  in ifx_spi_reset()
977  *	ifx_spi_spi_probe	-	probe callback
984  *	-	Support for multiple devices
985  *	-	Split out MID specific GPIO handling eventually
994 	struct device *dev = &spi->dev;  in ifx_spi_spi_probe()
998 		return -ENODEV;  in ifx_spi_spi_probe()
1004 		return -ENODEV;  in ifx_spi_spi_probe()
1011 		return -ENOMEM;  in ifx_spi_spi_probe()
1014 	ifx_dev->spi_dev = spi;  in ifx_spi_spi_probe()
1015 	clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);  in ifx_spi_spi_probe()
1016 	spin_lock_init(&ifx_dev->write_lock);  in ifx_spi_spi_probe()
1017 	spin_lock_init(&ifx_dev->power_lock);  in ifx_spi_spi_probe()
1018 	ifx_dev->power_status = 0;  in ifx_spi_spi_probe()
1019 	timer_setup(&ifx_dev->spi_timer, ifx_spi_timeout, 0);  in ifx_spi_spi_probe()
1020 	ifx_dev->modem = pl_data->modem_type;  in ifx_spi_spi_probe()
1021 	ifx_dev->use_dma = pl_data->use_dma;  in ifx_spi_spi_probe()
1022 	ifx_dev->max_hz = pl_data->max_hz;  in ifx_spi_spi_probe()
1024 	spi->max_speed_hz = ifx_dev->max_hz;  in ifx_spi_spi_probe()
1025 	spi->mode = IFX_SPI_MODE | (SPI_LOOP & spi->mode);  in ifx_spi_spi_probe()
1026 	spi->bits_per_word = spi_bpw;  in ifx_spi_spi_probe()
1031 		return -ENODEV;  in ifx_spi_spi_probe()
1035 	if (spi->bits_per_word == 32)  in ifx_spi_spi_probe()
1036 		ifx_dev->swap_buf = swap_buf_32;  in ifx_spi_spi_probe()
1037 	else if (spi->bits_per_word == 16)  in ifx_spi_spi_probe()
1038 		ifx_dev->swap_buf = swap_buf_16;  in ifx_spi_spi_probe()
1040 		ifx_dev->swap_buf = swap_buf_8;  in ifx_spi_spi_probe()
1043 	ifx_dev->spi_more = 0;  in ifx_spi_spi_probe()
1044 	ifx_dev->spi_slave_cts = 0;  in ifx_spi_spi_probe()
1047 	ifx_dev->tx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,  in ifx_spi_spi_probe()
1049 				&ifx_dev->tx_bus,  in ifx_spi_spi_probe()
1051 	if (!ifx_dev->tx_buffer) {  in ifx_spi_spi_probe()
1052 		dev_err(dev, "DMA-TX buffer allocation failed");  in ifx_spi_spi_probe()
1053 		ret = -ENOMEM;  in ifx_spi_spi_probe()
1056 	ifx_dev->rx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,  in ifx_spi_spi_probe()
1058 				&ifx_dev->rx_bus,  in ifx_spi_spi_probe()
1060 	if (!ifx_dev->rx_buffer) {  in ifx_spi_spi_probe()
1061 		dev_err(dev, "DMA-RX buffer allocation failed");  in ifx_spi_spi_probe()
1062 		ret = -ENOMEM;  in ifx_spi_spi_probe()
1067 	init_waitqueue_head(&ifx_dev->mdm_reset_wait);  in ifx_spi_spi_probe()
1070 	tasklet_setup(&ifx_dev->io_work_tasklet, ifx_spi_io);  in ifx_spi_spi_probe()
1072 	set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);  in ifx_spi_spi_probe()
1081 	ifx_dev->gpio.reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);  in ifx_spi_spi_probe()
1082 	if (IS_ERR(ifx_dev->gpio.reset)) {  in ifx_spi_spi_probe()
1084 		ret = PTR_ERR(ifx_dev->gpio.reset);  in ifx_spi_spi_probe()
1087 	gpiod_set_consumer_name(ifx_dev->gpio.reset, "ifxModem reset");  in ifx_spi_spi_probe()
1088 	ifx_dev->gpio.po = devm_gpiod_get(dev, "power", GPIOD_OUT_LOW);  in ifx_spi_spi_probe()
1089 	if (IS_ERR(ifx_dev->gpio.po)) {  in ifx_spi_spi_probe()
1091 		ret = PTR_ERR(ifx_dev->gpio.po);  in ifx_spi_spi_probe()
1094 	gpiod_set_consumer_name(ifx_dev->gpio.po, "ifxModem power");  in ifx_spi_spi_probe()
1095 	ifx_dev->gpio.mrdy = devm_gpiod_get(dev, "mrdy", GPIOD_OUT_LOW);  in ifx_spi_spi_probe()
1096 	if (IS_ERR(ifx_dev->gpio.mrdy)) {  in ifx_spi_spi_probe()
1098 		ret = PTR_ERR(ifx_dev->gpio.mrdy);  in ifx_spi_spi_probe()
1101 	gpiod_set_consumer_name(ifx_dev->gpio.mrdy, "ifxModem mrdy");  in ifx_spi_spi_probe()
1102 	ifx_dev->gpio.srdy = devm_gpiod_get(dev, "srdy", GPIOD_IN);  in ifx_spi_spi_probe()
1103 	if (IS_ERR(ifx_dev->gpio.srdy)) {  in ifx_spi_spi_probe()
1105 		ret = PTR_ERR(ifx_dev->gpio.srdy);  in ifx_spi_spi_probe()
1108 	gpiod_set_consumer_name(ifx_dev->gpio.srdy, "ifxModem srdy");  in ifx_spi_spi_probe()
1109 	ifx_dev->gpio.reset_out = devm_gpiod_get(dev, "rst_out", GPIOD_IN);  in ifx_spi_spi_probe()
1110 	if (IS_ERR(ifx_dev->gpio.reset_out)) {  in ifx_spi_spi_probe()
1112 		ret = PTR_ERR(ifx_dev->gpio.reset_out);  in ifx_spi_spi_probe()
1115 	gpiod_set_consumer_name(ifx_dev->gpio.reset_out, "ifxModem reset out");  in ifx_spi_spi_probe()
1116 	ifx_dev->gpio.pmu_reset = devm_gpiod_get(dev, "pmu_reset", GPIOD_ASIS);  in ifx_spi_spi_probe()
1117 	if (IS_ERR(ifx_dev->gpio.pmu_reset)) {  in ifx_spi_spi_probe()
1119 		ret = PTR_ERR(ifx_dev->gpio.pmu_reset);  in ifx_spi_spi_probe()
1122 	gpiod_set_consumer_name(ifx_dev->gpio.pmu_reset, "ifxModem PMU reset");  in ifx_spi_spi_probe()
1124 	ret = request_irq(gpiod_to_irq(ifx_dev->gpio.reset_out),  in ifx_spi_spi_probe()
1130 			gpiod_to_irq(ifx_dev->gpio.reset_out));  in ifx_spi_spi_probe()
1136 	ret = request_irq(gpiod_to_irq(ifx_dev->gpio.srdy),  in ifx_spi_spi_probe()
1141 			gpiod_to_irq(ifx_dev->gpio.srdy));  in ifx_spi_spi_probe()
1153 	srdy = gpiod_get_value(ifx_dev->gpio.srdy);  in ifx_spi_spi_probe()
1163 	free_irq(gpiod_to_irq(ifx_dev->gpio.reset_out), ifx_dev);  in ifx_spi_spi_probe()
1171  *	ifx_spi_spi_remove	-	SPI device was removed
1182 	tasklet_kill(&ifx_dev->io_work_tasklet);  in ifx_spi_spi_remove()
1184 	pm_runtime_disable(&spi->dev);  in ifx_spi_spi_remove()
1187 	free_irq(gpiod_to_irq(ifx_dev->gpio.reset_out), ifx_dev);  in ifx_spi_spi_remove()
1188 	free_irq(gpiod_to_irq(ifx_dev->gpio.srdy), ifx_dev);  in ifx_spi_spi_remove()
1198  *	ifx_spi_spi_shutdown	-	called on SPI shutdown
1217  *	ifx_spi_pm_suspend	-	suspend modem on system suspend
1229  *	ifx_spi_pm_resume	-	resume modem on system resume
1242  *	ifx_spi_pm_runtime_resume	-	suspend modem
1253  *	ifx_spi_pm_runtime_suspend	-	suspend modem
1265  *	ifx_spi_pm_runtime_idle		-	check if modem idle
1275 	if (!ifx_dev->power_status)  in ifx_spi_pm_runtime_idle()
1309  *	ifx_spi_exit	-	module exit
1324  *	ifx_spi_init		-	module entry point
1327  *	We need to initialize upper-edge spi driver after the tty
1338 		return -ENOMEM;  in ifx_spi_init()
1341 	tty_drv->driver_name = DRVNAME;  in ifx_spi_init()
1342 	tty_drv->name = TTYNAME;  in ifx_spi_init()
1343 	tty_drv->minor_start = IFX_SPI_TTY_ID;  in ifx_spi_init()
1344 	tty_drv->type = TTY_DRIVER_TYPE_SERIAL;  in ifx_spi_init()
1345 	tty_drv->subtype = SERIAL_TYPE_NORMAL;  in ifx_spi_init()
1346 	tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;  in ifx_spi_init()
1347 	tty_drv->init_termios = tty_std_termios;  in ifx_spi_init()
1389 MODULE_INFO(Version, "0.1-IFX6x60");