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>
17 #include "bus.h"
62  * support big endian host and commonly used SPI 8bits.
66 	struct wfx_spi_priv *bus = priv;  in wfx_spi_copy_from_io()  local
83 	if (bus->need_swab)  in wfx_spi_copy_from_io()
89 	ret = spi_sync(bus->func, &m);  in wfx_spi_copy_from_io()
91 	if (bus->need_swab && addr == WFX_REG_CONFIG)  in wfx_spi_copy_from_io()
99 	struct wfx_spi_priv *bus = priv;  in wfx_spi_copy_to_io()  local
122 	if (bus->need_swab)  in wfx_spi_copy_to_io()
124 	if (bus->need_swab && addr == WFX_REG_CONFIG)  in wfx_spi_copy_to_io()
131 	ret = spi_sync(bus->func, &m);  in wfx_spi_copy_to_io()
133 	if (bus->need_swab && addr == WFX_REG_CONFIG)  in wfx_spi_copy_to_io()
149 	struct wfx_spi_priv *bus = priv;  in wfx_spi_irq_handler()  local
151 	wfx_bh_request_rx(bus->core);  in wfx_spi_irq_handler()
157 	struct wfx_spi_priv *bus = priv;  in wfx_spi_irq_subscribe()  local
160 	flags = irq_get_trigger_type(bus->func->irq);  in wfx_spi_irq_subscribe()
164 	return devm_request_threaded_irq(&bus->func->dev, bus->func->irq, NULL,  in wfx_spi_irq_subscribe()
165 					 wfx_spi_irq_handler, flags, "wfx", bus);  in wfx_spi_irq_subscribe()
170 	struct wfx_spi_priv *bus = priv;  in wfx_spi_irq_unsubscribe()  local
172 	devm_free_irq(&bus->func->dev, bus->func->irq, bus);  in wfx_spi_irq_unsubscribe()
178 	/* Most of SPI controllers avoid DMA if buffer size is not 32bit aligned */  in wfx_spi_align_size()
195 	struct wfx_spi_priv *bus;  in wfx_spi_probe()  local
198 	if (!func->bits_per_word)  in wfx_spi_probe()
199 		func->bits_per_word = 16;  in wfx_spi_probe()
203 	pdata = (struct wfx_platform_data *)spi_get_device_id(func)->driver_data;  in wfx_spi_probe()
205 		dev_err(&func->dev, "unable to retrieve driver data (please report)\n");  in wfx_spi_probe()
206 		return -ENODEV;  in wfx_spi_probe()
210 	dev_dbg(&func->dev, "SPI params: CS=%d, mode=%d bits/word=%d speed=%d\n",  in wfx_spi_probe()
211 		spi_get_chipselect(func, 0), func->mode, func->bits_per_word, func->max_speed_hz);  in wfx_spi_probe()
212 	if (func->bits_per_word != 16 && func->bits_per_word != 8)  in wfx_spi_probe()
213 		dev_warn(&func->dev, "unusual bits/word value: %d\n", func->bits_per_word);  in wfx_spi_probe()
214 	if (func->max_speed_hz > 50000000)  in wfx_spi_probe()
215 		dev_warn(&func->dev, "%dHz is a very high speed\n", func->max_speed_hz);  in wfx_spi_probe()
217 	bus = devm_kzalloc(&func->dev, sizeof(*bus), GFP_KERNEL);  in wfx_spi_probe()
218 	if (!bus)  in wfx_spi_probe()
219 		return -ENOMEM;  in wfx_spi_probe()
220 	bus->func = func;  in wfx_spi_probe()
221 	if (func->bits_per_word == 8 || IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))  in wfx_spi_probe()
222 		bus->need_swab = true;  in wfx_spi_probe()
223 	spi_set_drvdata(func, bus);  in wfx_spi_probe()
225 	bus->gpio_reset = devm_gpiod_get_optional(&func->dev, "reset", GPIOD_OUT_LOW);  in wfx_spi_probe()
226 	if (IS_ERR(bus->gpio_reset))  in wfx_spi_probe()
227 		return PTR_ERR(bus->gpio_reset);  in wfx_spi_probe()
228 	if (!bus->gpio_reset) {  in wfx_spi_probe()
229 		dev_warn(&func->dev, "gpio reset is not defined, trying to load firmware anyway\n");  in wfx_spi_probe()
231 		gpiod_set_consumer_name(bus->gpio_reset, "wfx reset");  in wfx_spi_probe()
232 		gpiod_set_value_cansleep(bus->gpio_reset, 1);  in wfx_spi_probe()
234 		gpiod_set_value_cansleep(bus->gpio_reset, 0);  in wfx_spi_probe()
238 	bus->core = wfx_init_common(&func->dev, pdata, &wfx_spi_hwbus_ops, bus);  in wfx_spi_probe()
239 	if (!bus->core)  in wfx_spi_probe()
240 		return -EIO;  in wfx_spi_probe()
242 	return wfx_probe(bus->core);  in wfx_spi_probe()
247 	struct wfx_spi_priv *bus = spi_get_drvdata(func);  in wfx_spi_remove()  local
249 	wfx_release(bus->core);  in wfx_spi_remove()
263 MODULE_DEVICE_TABLE(spi, wfx_spi_id);
278 		.name = "wfx-spi",