1 // SPDX-License-Identifier: GPL-2.0
4  * Driver for the IFX 6x60 spi modem.
19  * o	The driver is intended to be big-endian safe but has never been
22  * o	Some of the GPIO naming/setup assumptions may need revisiting if
26 #include <linux/dma-mapping.h>
31 #include <linux/spi/spi.h>
42 #include <linux/gpio.h>
48 #include <linux/spi/ifx_modem.h>
60 #define IFX_SPI_HEADER_0		(-1)
61 #define IFX_SPI_HEADER_F		(-2)
101 /* GPIO/GPE settings */
104  *	mrdy_set_high		-	set MRDY GPIO
110 	gpio_set_value(ifx->gpio.mrdy, 1);  in mrdy_set_high()
114  *	mrdy_set_low		-	clear MRDY GPIO
120 	gpio_set_value(ifx->gpio.mrdy, 0);  in mrdy_set_low()
125  *	@ifx_dev: our SPI device
128  *	Set bit in power status and signal power system if status becomes non-0
135 	spin_lock_irqsave(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_set()
138 	 * if power status is already non-0, just update, else  in ifx_spi_power_state_set()
141 	if (!ifx_dev->power_status)  in ifx_spi_power_state_set()
142 		pm_runtime_get(&ifx_dev->spi_dev->dev);  in ifx_spi_power_state_set()
143 	ifx_dev->power_status |= val;  in ifx_spi_power_state_set()
145 	spin_unlock_irqrestore(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_set()
149  *	ifx_spi_power_state_clear	-	clear power bit
150  *	@ifx_dev: our SPI device
160 	spin_lock_irqsave(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_clear()
162 	if (ifx_dev->power_status) {  in ifx_spi_power_state_clear()
163 		ifx_dev->power_status &= ~val;  in ifx_spi_power_state_clear()
164 		if (!ifx_dev->power_status)  in ifx_spi_power_state_clear()
165 			pm_runtime_put(&ifx_dev->spi_dev->dev);  in ifx_spi_power_state_clear()
168 	spin_unlock_irqrestore(&ifx_dev->power_lock, flags);  in ifx_spi_power_state_clear()
181 	/* don't swap buffer if SPI word width is 8 bits */  in swap_buf_8()
237  *	mrdy_assert		-	assert MRDY line
238  *	@ifx_dev: our SPI device
247 	int val = gpio_get_value(ifx_dev->gpio.srdy);  in mrdy_assert()
250 				      &ifx_dev->flags)) {  in mrdy_assert()
251 			mod_timer(&ifx_dev->spi_timer,jiffies + IFX_SPI_TIMEOUT_SEC*HZ);  in mrdy_assert()
260  *	ifx_spi_timeout		-	SPI timeout
261  *	@arg: our SPI device
263  *	The SPI has timed out: hang up the tty. Users will then see a hangup
270 	dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");  in ifx_spi_timeout()
271 	tty_port_tty_hangup(&ifx_dev->tty_port, false);  in ifx_spi_timeout()
273 	clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);  in ifx_spi_timeout()
279  *	ifx_spi_tiocmget	-	get modem lines
289 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_tiocmget()
292 	(test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |  in ifx_spi_tiocmget()
293 	(test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |  in ifx_spi_tiocmget()
294 	(test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |  in ifx_spi_tiocmget()
295 	(test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |  in ifx_spi_tiocmget()
296 	(test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |  in ifx_spi_tiocmget()
297 	(test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);  in ifx_spi_tiocmget()
302  *	ifx_spi_tiocmset	-	set modem bits
315 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_tiocmset()
318 		set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
320 		set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
322 		clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
324 		clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
326 	set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);  in ifx_spi_tiocmset()
331  *	ifx_spi_open	-	called on tty open
342 	return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);  in ifx_spi_open()
346  *	ifx_spi_close	-	called when our tty closes
355 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_close()
356 	tty_port_close(&ifx_dev->tty_port, tty, filp);  in ifx_spi_close()
361  *	ifx_decode_spi_header	-	decode received header
367  *	Note how received_cts is handled -- if header is all F it is left
400  *	ifx_setup_spi_header	-	set header fields
401  *	@txbuffer: pointer to start of SPI buffer
405  *	Format up an SPI header for a transfer
418  *	ifx_spi_prepare_tx_buffer	-	prepare transmit frame
419  *	@ifx_dev: our SPI device
424  *	ifx_dev->tx_buffer
426  *	FIXME: performance - should we wake the tty when the queue is half
436 	tx_buffer = ifx_dev->tx_buffer;  in ifx_spi_prepare_tx_buffer()
438 	/* make room for required SPI header */  in ifx_spi_prepare_tx_buffer()
444 	ifx_dev->spi_more = 0;  in ifx_spi_prepare_tx_buffer()
447 	if (!ifx_dev->spi_slave_cts) {  in ifx_spi_prepare_tx_buffer()
449 		queue_length = kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_prepare_tx_buffer()
451 			/* data to mux -- see if there's room for it */  in ifx_spi_prepare_tx_buffer()
453 			temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,  in ifx_spi_prepare_tx_buffer()
455 					&ifx_dev->fifo_lock);  in ifx_spi_prepare_tx_buffer()
462 				tty_port_tty_wakeup(&ifx_dev->tty_port);  in ifx_spi_prepare_tx_buffer()
463 			else /* more data in port, use next SPI message */  in ifx_spi_prepare_tx_buffer()
464 				ifx_dev->spi_more = 1;  in ifx_spi_prepare_tx_buffer()
467 	/* have data and info for header -- set up SPI header in buffer */  in ifx_spi_prepare_tx_buffer()
468 	/* spi header needs payload size, not entire buffer size */  in ifx_spi_prepare_tx_buffer()
469 	ifx_spi_setup_spi_header(ifx_dev->tx_buffer,  in ifx_spi_prepare_tx_buffer()
470 					tx_count-IFX_SPI_HEADER_OVERHEAD,  in ifx_spi_prepare_tx_buffer()
471 					ifx_dev->spi_more);  in ifx_spi_prepare_tx_buffer()
473 	ifx_dev->swap_buf((ifx_dev->tx_buffer), tx_count,  in ifx_spi_prepare_tx_buffer()
474 		&ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);  in ifx_spi_prepare_tx_buffer()
479  *	ifx_spi_write		-	line discipline write
491 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_write()
497 	spin_lock_irqsave(&ifx_dev->fifo_lock, flags);  in ifx_spi_write()
498 	is_fifo_empty = kfifo_is_empty(&ifx_dev->tx_fifo);  in ifx_spi_write()
499 	tx_count = kfifo_in(&ifx_dev->tx_fifo, tmp_buf, count);  in ifx_spi_write()
500 	spin_unlock_irqrestore(&ifx_dev->fifo_lock, flags);  in ifx_spi_write()
508  *	ifx_spi_chars_in_buffer	-	line discipline helper
516 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_write_room()
517 	return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_write_room()
521  *	ifx_spi_chars_in_buffer	-	line discipline helper
529 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_chars_in_buffer()
530 	return kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_chars_in_buffer()
543 	struct ifx_spi_device *ifx_dev = tty->driver_data;  in ifx_spi_hangup()
544 	tty_port_hangup(&ifx_dev->tty_port);  in ifx_spi_hangup()
551  *	tty port activate method - called for first open. Serialized
560 	kfifo_reset(&ifx_dev->tx_fifo);  in ifx_port_activate()
563 	clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);  in ifx_port_activate()
564 	clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);  in ifx_port_activate()
567 	tty->driver_data = ifx_dev;  in ifx_port_activate()
570 	port->low_latency = 1;  in ifx_port_activate()
573 	set_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags);  in ifx_port_activate()
582  *	tty port shutdown method - called for last port close. Serialized
590 	clear_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags);  in ifx_port_shutdown()
592 	del_timer(&ifx_dev->spi_timer);  in ifx_port_shutdown()
593 	clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);  in ifx_port_shutdown()
594 	tasklet_kill(&ifx_dev->io_work_tasklet);  in ifx_port_shutdown()
614  *	ifx_spi_insert_fip_string	-	queue received data
615  *	@ifx_ser: our SPI device
625 	tty_insert_flip_string(&ifx_dev->tty_port, chars, size);  in ifx_spi_insert_flip_string()
626 	tty_flip_buffer_push(&ifx_dev->tty_port);  in ifx_spi_insert_flip_string()
630  *	ifx_spi_complete	-	SPI transfer completed
631  *	@ctx: our SPI device
633  *	An SPI transfer has completed. Process any received data and kick off
650 	if (!ifx_dev->spi_msg.status) {  in ifx_spi_complete()
652 		ifx_dev->swap_buf(ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,  in ifx_spi_complete()
653 			&ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);  in ifx_spi_complete()
654 		decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,  in ifx_spi_complete()
657 			dev_dbg(&ifx_dev->spi_dev->dev,  in ifx_spi_complete()
659 			ifx_dev->spi_slave_cts = 0;  in ifx_spi_complete()
662 			dev_dbg(&ifx_dev->spi_dev->dev,  in ifx_spi_complete()
667 		ifx_dev->spi_slave_cts = cts;  in ifx_spi_complete()
670 					ifx_dev->spi_msg.actual_length);  in ifx_spi_complete()
671 		ifx_dev->swap_buf(  in ifx_spi_complete()
672 			(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),  in ifx_spi_complete()
674 			 &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);  in ifx_spi_complete()
677 			ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,  in ifx_spi_complete()
681 		dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",  in ifx_spi_complete()
682 		       ifx_dev->spi_msg.status);  in ifx_spi_complete()
686 	if (ifx_dev->write_pending) {  in ifx_spi_complete()
687 		ifx_dev->write_pending = 0;  in ifx_spi_complete()
691 	clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));  in ifx_spi_complete()
693 	queue_length = kfifo_len(&ifx_dev->tx_fifo);  in ifx_spi_complete()
694 	srdy = gpio_get_value(ifx_dev->gpio.srdy);  in ifx_spi_complete()
699 	if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))  in ifx_spi_complete()
700 		tasklet_schedule(&ifx_dev->io_work_tasklet);  in ifx_spi_complete()
702 		if (more || ifx_dev->spi_more || queue_length > 0 ||  in ifx_spi_complete()
704 			if (ifx_dev->spi_slave_cts) {  in ifx_spi_complete()
717 			tty_port_tty_wakeup(&ifx_dev->tty_port);  in ifx_spi_complete()
723  *	ifx_spio_io		-	I/O tasklet
724  *	@data: our SPI device
734 	if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags) &&  in ifx_spi_io()
735 		test_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags)) {  in ifx_spi_io()
736 		if (ifx_dev->gpio.unack_srdy_int_nb > 0)  in ifx_spi_io()
737 			ifx_dev->gpio.unack_srdy_int_nb--;  in ifx_spi_io()
741 		spi_message_init(&ifx_dev->spi_msg);  in ifx_spi_io()
742 		INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);  in ifx_spi_io()
744 		ifx_dev->spi_msg.context = ifx_dev;  in ifx_spi_io()
745 		ifx_dev->spi_msg.complete = ifx_spi_complete;  in ifx_spi_io()
747 		/* set up our spi transfer */  in ifx_spi_io()
749 		ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;  in ifx_spi_io()
750 		ifx_dev->spi_xfer.cs_change = 0;  in ifx_spi_io()
751 		ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz;  in ifx_spi_io()
752 		/* ifx_dev->spi_xfer.speed_hz = 390625; */  in ifx_spi_io()
753 		ifx_dev->spi_xfer.bits_per_word =  in ifx_spi_io()
754 			ifx_dev->spi_dev->bits_per_word;  in ifx_spi_io()
756 		ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;  in ifx_spi_io()
757 		ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;  in ifx_spi_io()
762 		if (ifx_dev->use_dma) {  in ifx_spi_io()
763 			ifx_dev->spi_msg.is_dma_mapped = 1;  in ifx_spi_io()
764 			ifx_dev->tx_dma = ifx_dev->tx_bus;  in ifx_spi_io()
765 			ifx_dev->rx_dma = ifx_dev->rx_bus;  in ifx_spi_io()
766 			ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;  in ifx_spi_io()
767 			ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;  in ifx_spi_io()
769 			ifx_dev->spi_msg.is_dma_mapped = 0;  in ifx_spi_io()
770 			ifx_dev->tx_dma = (dma_addr_t)0;  in ifx_spi_io()
771 			ifx_dev->rx_dma = (dma_addr_t)0;  in ifx_spi_io()
772 			ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;  in ifx_spi_io()
773 			ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;  in ifx_spi_io()
776 		spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);  in ifx_spi_io()
783 		retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);  in ifx_spi_io()
786 				  &ifx_dev->flags);  in ifx_spi_io()
787 			tasklet_schedule(&ifx_dev->io_work_tasklet);  in ifx_spi_io()
791 		ifx_dev->write_pending = 1;  in ifx_spi_io()
795  *	ifx_spi_free_port	-	free up the tty side
802 	if (ifx_dev->tty_dev)  in ifx_spi_free_port()
803 		tty_unregister_device(tty_drv, ifx_dev->minor);  in ifx_spi_free_port()
804 	tty_port_destroy(&ifx_dev->tty_port);  in ifx_spi_free_port()
805 	kfifo_free(&ifx_dev->tx_fifo);  in ifx_spi_free_port()
809  *	ifx_spi_create_port	-	create a new port
810  *	@ifx_dev: our spi device
818 	struct tty_port *pport = &ifx_dev->tty_port;  in ifx_spi_create_port()
820 	spin_lock_init(&ifx_dev->fifo_lock);  in ifx_spi_create_port()
821 	lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,  in ifx_spi_create_port()
824 	if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {  in ifx_spi_create_port()
825 		ret = -ENOMEM;  in ifx_spi_create_port()
830 	pport->ops = &ifx_tty_port_ops;  in ifx_spi_create_port()
831 	ifx_dev->minor = IFX_SPI_TTY_ID;  in ifx_spi_create_port()
832 	ifx_dev->tty_dev = tty_port_register_device(pport, tty_drv,  in ifx_spi_create_port()
833 			ifx_dev->minor, &ifx_dev->spi_dev->dev);  in ifx_spi_create_port()
834 	if (IS_ERR(ifx_dev->tty_dev)) {  in ifx_spi_create_port()
835 		dev_dbg(&ifx_dev->spi_dev->dev,  in ifx_spi_create_port()
837 		ret = PTR_ERR(ifx_dev->tty_dev);  in ifx_spi_create_port()
850  *	ifx_spi_handle_srdy		-	handle SRDY
859 	if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {  in ifx_spi_handle_srdy()
860 		del_timer(&ifx_dev->spi_timer);  in ifx_spi_handle_srdy()
861 		clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);  in ifx_spi_handle_srdy()
866 	if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))  in ifx_spi_handle_srdy()
867 		tasklet_schedule(&ifx_dev->io_work_tasklet);  in ifx_spi_handle_srdy()
869 		set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);  in ifx_spi_handle_srdy()
873  *	ifx_spi_srdy_interrupt	-	SRDY asserted
882 	ifx_dev->gpio.unack_srdy_int_nb++;  in ifx_spi_srdy_interrupt()
888  *	ifx_spi_reset_interrupt	-	Modem has changed reset state
892  *	The modem has either entered or left reset state. Check the GPIO
901 	int val = gpio_get_value(ifx_dev->gpio.reset_out);  in ifx_spi_reset_interrupt()
902 	int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
906 		set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
909 			tty_port_tty_hangup(&ifx_dev->tty_port, false);  in ifx_spi_reset_interrupt()
913 		clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
915 			set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);  in ifx_spi_reset_interrupt()
916 			wake_up(&ifx_dev->mdm_reset_wait);  in ifx_spi_reset_interrupt()
923  *	ifx_spi_free_device - free device
931 	dma_free_coherent(&ifx_dev->spi_dev->dev,  in ifx_spi_free_device()
933 				ifx_dev->tx_buffer,  in ifx_spi_free_device()
934 				ifx_dev->tx_bus);  in ifx_spi_free_device()
935 	dma_free_coherent(&ifx_dev->spi_dev->dev,  in ifx_spi_free_device()
937 				ifx_dev->rx_buffer,  in ifx_spi_free_device()
938 				ifx_dev->rx_bus);  in ifx_spi_free_device()
942  *	ifx_spi_reset	-	reset modem
956 	set_bit(MR_START, &ifx_dev->mdm_reset_state);  in ifx_spi_reset()
957 	gpio_set_value(ifx_dev->gpio.po, 0);  in ifx_spi_reset()
958 	gpio_set_value(ifx_dev->gpio.reset, 0);  in ifx_spi_reset()
960 	gpio_set_value(ifx_dev->gpio.reset, 1);  in ifx_spi_reset()
962 	gpio_set_value(ifx_dev->gpio.po, 1);  in ifx_spi_reset()
964 	gpio_set_value(ifx_dev->gpio.po, 0);  in ifx_spi_reset()
965 	ret = wait_event_timeout(ifx_dev->mdm_reset_wait,  in ifx_spi_reset()
967 					  &ifx_dev->mdm_reset_state),  in ifx_spi_reset()
970 		dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",  in ifx_spi_reset()
971 			 ifx_dev->mdm_reset_state);  in ifx_spi_reset()
973 	ifx_dev->mdm_reset_state = 0;  in ifx_spi_reset()
978  *	ifx_spi_spi_probe	-	probe callback
979  *	@spi: our possible matching SPI device
981  *	Probe for a 6x60 modem on SPI bus. Perform any needed device and
982  *	GPIO setup.
985  *	-	Support for multiple devices
986  *	-	Split out MID specific GPIO handling eventually
989 static int ifx_spi_spi_probe(struct spi_device *spi)  in ifx_spi_spi_probe()  argument
997 		dev_dbg(&spi->dev, "ignoring subsequent detection");  in ifx_spi_spi_probe()
998 		return -ENODEV;  in ifx_spi_spi_probe()
1001 	pl_data = dev_get_platdata(&spi->dev);  in ifx_spi_spi_probe()
1003 		dev_err(&spi->dev, "missing platform data!");  in ifx_spi_spi_probe()
1004 		return -ENODEV;  in ifx_spi_spi_probe()
1010 		dev_err(&spi->dev, "spi device allocation failed");  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()
1023 	/* initialize spi mode, etc */  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()
1027 	ret = spi_setup(spi);  in ifx_spi_spi_probe()
1029 		dev_err(&spi->dev, "SPI setup wasn't successful %d", ret);  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()
1042 	/* ensure SPI protocol flags are initialized to enable transfer */  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(&spi->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(&spi->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()
1069 	spi_set_drvdata(spi, ifx_dev);  in ifx_spi_spi_probe()
1070 	tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io,  in ifx_spi_spi_probe()
1073 	set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);  in ifx_spi_spi_probe()
1078 		dev_err(&spi->dev, "create default tty port failed");  in ifx_spi_spi_probe()
1082 	ifx_dev->gpio.reset = pl_data->rst_pmu;  in ifx_spi_spi_probe()
1083 	ifx_dev->gpio.po = pl_data->pwr_on;  in ifx_spi_spi_probe()
1084 	ifx_dev->gpio.mrdy = pl_data->mrdy;  in ifx_spi_spi_probe()
1085 	ifx_dev->gpio.srdy = pl_data->srdy;  in ifx_spi_spi_probe()
1086 	ifx_dev->gpio.reset_out = pl_data->rst_out;  in ifx_spi_spi_probe()
1088 	dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d",  in ifx_spi_spi_probe()
1089 		 ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy,  in ifx_spi_spi_probe()
1090 		 ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out);  in ifx_spi_spi_probe()
1093 	ret = gpio_request(ifx_dev->gpio.reset, "ifxModem");  in ifx_spi_spi_probe()
1095 		dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)",  in ifx_spi_spi_probe()
1096 			ifx_dev->gpio.reset);  in ifx_spi_spi_probe()
1099 	ret += gpio_direction_output(ifx_dev->gpio.reset, 0);  in ifx_spi_spi_probe()
1100 	ret += gpio_export(ifx_dev->gpio.reset, 1);  in ifx_spi_spi_probe()
1102 		dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)",  in ifx_spi_spi_probe()
1103 			ifx_dev->gpio.reset);  in ifx_spi_spi_probe()
1104 		ret = -EBUSY;  in ifx_spi_spi_probe()
1108 	ret = gpio_request(ifx_dev->gpio.po, "ifxModem");  in ifx_spi_spi_probe()
1109 	ret += gpio_direction_output(ifx_dev->gpio.po, 0);  in ifx_spi_spi_probe()
1110 	ret += gpio_export(ifx_dev->gpio.po, 1);  in ifx_spi_spi_probe()
1112 		dev_err(&spi->dev, "Unable to configure GPIO%d (ON)",  in ifx_spi_spi_probe()
1113 			ifx_dev->gpio.po);  in ifx_spi_spi_probe()
1114 		ret = -EBUSY;  in ifx_spi_spi_probe()
1118 	ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem");  in ifx_spi_spi_probe()
1120 		dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)",  in ifx_spi_spi_probe()
1121 			ifx_dev->gpio.mrdy);  in ifx_spi_spi_probe()
1124 	ret += gpio_export(ifx_dev->gpio.mrdy, 1);  in ifx_spi_spi_probe()
1125 	ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0);  in ifx_spi_spi_probe()
1127 		dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)",  in ifx_spi_spi_probe()
1128 			ifx_dev->gpio.mrdy);  in ifx_spi_spi_probe()
1129 		ret = -EBUSY;  in ifx_spi_spi_probe()
1133 	ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem");  in ifx_spi_spi_probe()
1135 		dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)",  in ifx_spi_spi_probe()
1136 			ifx_dev->gpio.srdy);  in ifx_spi_spi_probe()
1137 		ret = -EBUSY;  in ifx_spi_spi_probe()
1140 	ret += gpio_export(ifx_dev->gpio.srdy, 1);  in ifx_spi_spi_probe()
1141 	ret += gpio_direction_input(ifx_dev->gpio.srdy);  in ifx_spi_spi_probe()
1143 		dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)",  in ifx_spi_spi_probe()
1144 			ifx_dev->gpio.srdy);  in ifx_spi_spi_probe()
1145 		ret = -EBUSY;  in ifx_spi_spi_probe()
1149 	ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem");  in ifx_spi_spi_probe()
1151 		dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)",  in ifx_spi_spi_probe()
1152 			ifx_dev->gpio.reset_out);  in ifx_spi_spi_probe()
1155 	ret += gpio_export(ifx_dev->gpio.reset_out, 1);  in ifx_spi_spi_probe()
1156 	ret += gpio_direction_input(ifx_dev->gpio.reset_out);  in ifx_spi_spi_probe()
1158 		dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)",  in ifx_spi_spi_probe()
1159 			ifx_dev->gpio.reset_out);  in ifx_spi_spi_probe()
1160 		ret = -EBUSY;  in ifx_spi_spi_probe()
1164 	ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out),  in ifx_spi_spi_probe()
1169 		dev_err(&spi->dev, "Unable to get irq %x\n",  in ifx_spi_spi_probe()
1170 			gpio_to_irq(ifx_dev->gpio.reset_out));  in ifx_spi_spi_probe()
1176 	ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy),  in ifx_spi_spi_probe()
1180 		dev_err(&spi->dev, "Unable to get irq %x",  in ifx_spi_spi_probe()
1181 			gpio_to_irq(ifx_dev->gpio.srdy));  in ifx_spi_spi_probe()
1186 	pm_runtime_set_active(&spi->dev);  in ifx_spi_spi_probe()
1187 	pm_runtime_enable(&spi->dev);  in ifx_spi_spi_probe()
1193 	srdy = gpio_get_value(ifx_dev->gpio.srdy);  in ifx_spi_spi_probe()
1203 	free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), ifx_dev);  in ifx_spi_spi_probe()
1205 	gpio_free(ifx_dev->gpio.srdy);  in ifx_spi_spi_probe()
1207 	gpio_free(ifx_dev->gpio.mrdy);  in ifx_spi_spi_probe()
1209 	gpio_free(ifx_dev->gpio.reset);  in ifx_spi_spi_probe()
1211 	gpio_free(ifx_dev->gpio.po);  in ifx_spi_spi_probe()
1213 	gpio_free(ifx_dev->gpio.reset_out);  in ifx_spi_spi_probe()
1221  *	ifx_spi_spi_remove	-	SPI device was removed
1222  *	@spi: SPI device
1228 static int ifx_spi_spi_remove(struct spi_device *spi)  in ifx_spi_spi_remove()  argument
1230 	struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);  in ifx_spi_spi_remove()
1232 	tasklet_kill(&ifx_dev->io_work_tasklet);  in ifx_spi_spi_remove()
1234 	pm_runtime_disable(&spi->dev);  in ifx_spi_spi_remove()
1237 	free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), ifx_dev);  in ifx_spi_spi_remove()
1238 	free_irq(gpio_to_irq(ifx_dev->gpio.srdy), ifx_dev);  in ifx_spi_spi_remove()
1240 	gpio_free(ifx_dev->gpio.srdy);  in ifx_spi_spi_remove()
1241 	gpio_free(ifx_dev->gpio.mrdy);  in ifx_spi_spi_remove()
1242 	gpio_free(ifx_dev->gpio.reset);  in ifx_spi_spi_remove()
1243 	gpio_free(ifx_dev->gpio.po);  in ifx_spi_spi_remove()
1244 	gpio_free(ifx_dev->gpio.reset_out);  in ifx_spi_spi_remove()
1254  *	ifx_spi_spi_shutdown	-	called on SPI shutdown
1255  *	@spi: SPI device
1260 static void ifx_spi_spi_shutdown(struct spi_device *spi)  in ifx_spi_spi_shutdown()  argument
1262 	struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);  in ifx_spi_spi_shutdown()
1273  *	ifx_spi_pm_suspend	-	suspend modem on system suspend
1285  *	ifx_spi_pm_resume	-	resume modem on system resume
1298  *	ifx_spi_pm_runtime_resume	-	suspend modem
1309  *	ifx_spi_pm_runtime_suspend	-	suspend modem
1321  *	ifx_spi_pm_runtime_idle		-	check if modem idle
1328 	struct spi_device *spi = to_spi_device(dev);  in ifx_spi_pm_runtime_idle()  local
1329 	struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);  in ifx_spi_pm_runtime_idle()
1331 	if (!ifx_dev->power_status)  in ifx_spi_pm_runtime_idle()
1350 MODULE_DEVICE_TABLE(spi, ifx_id_table);
1352 /* spi operations */
1365  *	ifx_spi_exit	-	module exit
1380  *	ifx_spi_init		-	module entry point
1382  *	Initialise the SPI and tty interfaces for the IFX SPI driver
1383  *	We need to initialize upper-edge spi driver after the tty
1384  *	driver because otherwise the spi probe will race
1394 		return -ENOMEM;  in ifx_spi_init()
1397 	tty_drv->driver_name = DRVNAME;  in ifx_spi_init()
1398 	tty_drv->name = TTYNAME;  in ifx_spi_init()
1399 	tty_drv->minor_start = IFX_SPI_TTY_ID;  in ifx_spi_init()
1400 	tty_drv->type = TTY_DRIVER_TYPE_SERIAL;  in ifx_spi_init()
1401 	tty_drv->subtype = SERIAL_TYPE_NORMAL;  in ifx_spi_init()
1402 	tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;  in ifx_spi_init()
1403 	tty_drv->init_termios = tty_std_termios;  in ifx_spi_init()
1443 MODULE_DESCRIPTION("IFX6x60 spi driver");
1445 MODULE_INFO(Version, "0.1-IFX6x60");