1 // SPDX-License-Identifier: GPL-2.0-only
3  * SPI interface.
5  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
7  * Copyright (c) 2010, ST-Ericsson
12 #include <linux/spi/spi.h>
18 #include "bus.h"
63  * support big endian host and commonly used SPI 8bits.
67 	struct wfx_spi_priv *bus = priv;  in wfx_spi_copy_from_io()  local
84 	if (bus->need_swab)  in wfx_spi_copy_from_io()
90 	ret = spi_sync(bus->func, &m);  in wfx_spi_copy_from_io()
92 	if (bus->need_swab && addr == WFX_REG_CONFIG)  in wfx_spi_copy_from_io()
100 	struct wfx_spi_priv *bus = priv;  in wfx_spi_copy_to_io()  local
123 	if (bus->need_swab)  in wfx_spi_copy_to_io()
125 	if (bus->need_swab && addr == WFX_REG_CONFIG)  in wfx_spi_copy_to_io()
132 	ret = spi_sync(bus->func, &m);  in wfx_spi_copy_to_io()
134 	if (bus->need_swab && addr == WFX_REG_CONFIG)  in wfx_spi_copy_to_io()
150 	struct wfx_spi_priv *bus = priv;  in wfx_spi_irq_handler()  local
152 	wfx_bh_request_rx(bus->core);  in wfx_spi_irq_handler()
158 	struct wfx_spi_priv *bus = priv;  in wfx_spi_irq_subscribe()  local
161 	flags = irq_get_trigger_type(bus->func->irq);  in wfx_spi_irq_subscribe()
165 	return devm_request_threaded_irq(&bus->func->dev, bus->func->irq, NULL,  in wfx_spi_irq_subscribe()
166 					 wfx_spi_irq_handler, flags, "wfx", bus);  in wfx_spi_irq_subscribe()
171 	struct wfx_spi_priv *bus = priv;  in wfx_spi_irq_unsubscribe()  local
173 	devm_free_irq(&bus->func->dev, bus->func->irq, bus);  in wfx_spi_irq_unsubscribe()
179 	/* Most of SPI controllers avoid DMA if buffer size is not 32bit aligned */  in wfx_spi_align_size()
185 	struct wfx_spi_priv *bus = priv;  in wfx_spi_set_wakeup()  local
187 	device_set_wakeup_enable(&bus->func->dev, enabled);  in wfx_spi_set_wakeup()
204 	struct wfx_spi_priv *bus = spi_get_drvdata(func);  in wfx_spi_suspend()  local
208 	flush_work(&bus->core->hif.bh);  in wfx_spi_suspend()
209 	return enable_irq_wake(func->irq);  in wfx_spi_suspend()
218 	return disable_irq_wake(func->irq);  in wfx_spi_resume()
224 	struct wfx_spi_priv *bus;  in wfx_spi_probe()  local
227 	if (!func->bits_per_word)  in wfx_spi_probe()
228 		func->bits_per_word = 16;  in wfx_spi_probe()
232 	pdata = (struct wfx_platform_data *)spi_get_device_id(func)->driver_data;  in wfx_spi_probe()
234 		dev_err(&func->dev, "unable to retrieve driver data (please report)\n");  in wfx_spi_probe()
235 		return -ENODEV;  in wfx_spi_probe()
239 	dev_dbg(&func->dev, "SPI params: CS=%d, mode=%d bits/word=%d speed=%d\n",  in wfx_spi_probe()
240 		spi_get_chipselect(func, 0), func->mode, func->bits_per_word, func->max_speed_hz);  in wfx_spi_probe()
241 	if (func->bits_per_word != 16 && func->bits_per_word != 8)  in wfx_spi_probe()
242 		dev_warn(&func->dev, "unusual bits/word value: %d\n", func->bits_per_word);  in wfx_spi_probe()
243 	if (func->max_speed_hz > 50000000)  in wfx_spi_probe()
244 		dev_warn(&func->dev, "%dHz is a very high speed\n", func->max_speed_hz);  in wfx_spi_probe()
246 	bus = devm_kzalloc(&func->dev, sizeof(*bus), GFP_KERNEL);  in wfx_spi_probe()
247 	if (!bus)  in wfx_spi_probe()
248 		return -ENOMEM;  in wfx_spi_probe()
249 	bus->func = func;  in wfx_spi_probe()
250 	if (func->bits_per_word == 8 || IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))  in wfx_spi_probe()
251 		bus->need_swab = true;  in wfx_spi_probe()
252 	spi_set_drvdata(func, bus);  in wfx_spi_probe()
254 	bus->gpio_reset = devm_gpiod_get_optional(&func->dev, "reset", GPIOD_OUT_LOW);  in wfx_spi_probe()
255 	if (IS_ERR(bus->gpio_reset))  in wfx_spi_probe()
256 		return PTR_ERR(bus->gpio_reset);  in wfx_spi_probe()
257 	if (!bus->gpio_reset) {  in wfx_spi_probe()
258 		dev_warn(&func->dev, "gpio reset is not defined, trying to load firmware anyway\n");  in wfx_spi_probe()
260 		gpiod_set_consumer_name(bus->gpio_reset, "wfx reset");  in wfx_spi_probe()
261 		gpiod_set_value_cansleep(bus->gpio_reset, 1);  in wfx_spi_probe()
263 		gpiod_set_value_cansleep(bus->gpio_reset, 0);  in wfx_spi_probe()
267 	bus->core = wfx_init_common(&func->dev, pdata, &wfx_spi_hwbus_ops, bus);  in wfx_spi_probe()
268 	if (!bus->core)  in wfx_spi_probe()
269 		return -EIO;  in wfx_spi_probe()
271 	ret = wfx_probe(bus->core);  in wfx_spi_probe()
275 	device_set_wakeup_capable(&func->dev, true);  in wfx_spi_probe()
281 	struct wfx_spi_priv *bus = spi_get_drvdata(func);  in wfx_spi_remove()  local
283 	wfx_release(bus->core);  in wfx_spi_remove()
297 MODULE_DEVICE_TABLE(spi, wfx_spi_id);
317 		.name = "wfx-spi",