1 // SPDX-License-Identifier: GPL-2.0-only
3  * Mac80211 SPI driver for ST-Ericsson CW1200 device
9  * Copyright (c) 2010, ST-Ericsson
25 #include <linux/platform_data/net-cw1200.h>
29 MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SPI driver");
41 	struct gpio_desc	*reset;  member
54    Hardware expects 32-bit data to be written as 16-bit BE words:
91 	if (self->func->bits_per_word == 8)  in cw1200_spi_memcpy_fromio()
98 	ret = spi_sync(self->func, &m);  in cw1200_spi_memcpy_fromio()
114 	if (self->func->bits_per_word == 8)  in cw1200_spi_memcpy_fromio()
156 	if (self->func->bits_per_word == 8)  in cw1200_spi_memcpy_toio()
178 	rval = spi_sync(self->func, &m);  in cw1200_spi_memcpy_toio()
186 	if (self->func->bits_per_word == 8)  in cw1200_spi_memcpy_toio()
204 	add_wait_queue(&self->wq, &wait);  in cw1200_spi_lock()
205 	spin_lock_irqsave(&self->lock, flags);  in cw1200_spi_lock()
208 		if (!self->claimed)  in cw1200_spi_lock()
210 		spin_unlock_irqrestore(&self->lock, flags);  in cw1200_spi_lock()
212 		spin_lock_irqsave(&self->lock, flags);  in cw1200_spi_lock()
215 	self->claimed = 1;  in cw1200_spi_lock()
216 	spin_unlock_irqrestore(&self->lock, flags);  in cw1200_spi_lock()
217 	remove_wait_queue(&self->wq, &wait);  in cw1200_spi_lock()
226 	spin_lock_irqsave(&self->lock, flags);  in cw1200_spi_unlock()
227 	self->claimed = 0;  in cw1200_spi_unlock()
228 	spin_unlock_irqrestore(&self->lock, flags);  in cw1200_spi_unlock()
229 	wake_up(&self->wq);  in cw1200_spi_unlock()
238 	if (self->core) {  in cw1200_spi_irq_handler()
240 		cw1200_irq_handler(self->core);  in cw1200_spi_irq_handler()
254 	ret = request_threaded_irq(self->func->irq, NULL,  in cw1200_spi_irq_subscribe()
261 	ret = enable_irq_wake(self->func->irq);  in cw1200_spi_irq_subscribe()
268 	free_irq(self->func->irq, self);  in cw1200_spi_irq_subscribe()
276 	disable_irq_wake(self->func->irq);  in cw1200_spi_irq_unsubscribe()
277 	free_irq(self->func->irq, self);  in cw1200_spi_irq_unsubscribe()
282 	if (self->reset) {  in cw1200_spi_off()
283 		/* Assert RESET, note active low */  in cw1200_spi_off()
284 		gpiod_set_value(self->reset, 1);  in cw1200_spi_off()
288 	if (pdata->power_ctrl)  in cw1200_spi_off()
289 		pdata->power_ctrl(pdata, false);  in cw1200_spi_off()
290 	if (pdata->clk_ctrl)  in cw1200_spi_off()
291 		pdata->clk_ctrl(pdata, false);  in cw1200_spi_off()
299 	gpiod_direction_output(self->reset, 1); /* Active low */  in cw1200_spi_on()
300 	gpiod_direction_output(self->powerup, 0);  in cw1200_spi_on()
301 	if (self->reset || self->powerup)  in cw1200_spi_on()
305 	if (pdata->power_ctrl) {  in cw1200_spi_on()
306 		if (pdata->power_ctrl(pdata, true)) {  in cw1200_spi_on()
308 			return -1;  in cw1200_spi_on()
313 	if (pdata->clk_ctrl) {  in cw1200_spi_on()
314 		if (pdata->clk_ctrl(pdata, true)) {  in cw1200_spi_on()
316 			return -1;  in cw1200_spi_on()
322 	if (self->powerup) {  in cw1200_spi_on()
323 		gpiod_set_value(self->powerup, 1);  in cw1200_spi_on()
327 	if (self->reset) {  in cw1200_spi_on()
328 		gpiod_set_value(self->reset, 0);  in cw1200_spi_on()
341 	return irq_set_irq_wake(self->func->irq, suspend);  in cw1200_spi_pm()
353 /* Probe Function to be called by SPI stack when device is discovered */
357 		dev_get_platdata(&func->dev);  in cw1200_spi_probe()
362 	if (func->max_speed_hz > 52000000)  in cw1200_spi_probe()
363 		func->max_speed_hz = 52000000;  in cw1200_spi_probe()
364 	if (func->max_speed_hz < 1000000)  in cw1200_spi_probe()
365 		func->max_speed_hz = 1000000;  in cw1200_spi_probe()
368 	if (plat_data->spi_bits_per_word)  in cw1200_spi_probe()
369 		func->bits_per_word = plat_data->spi_bits_per_word;  in cw1200_spi_probe()
370 	if (!func->bits_per_word)  in cw1200_spi_probe()
371 		func->bits_per_word = 16;  in cw1200_spi_probe()
374 	func->mode = SPI_MODE_0;  in cw1200_spi_probe()
376 	pr_info("cw1200_wlan_spi: Probe called (CS %d M %d BPW %d CLK %d)\n",  in cw1200_spi_probe()
377 		spi_get_chipselect(func, 0), func->mode, func->bits_per_word,  in cw1200_spi_probe()
378 		func->max_speed_hz);  in cw1200_spi_probe()
380 	self = devm_kzalloc(&func->dev, sizeof(*self), GFP_KERNEL);  in cw1200_spi_probe()
383 		return -ENOMEM;  in cw1200_spi_probe()
386 	/* Request reset asserted */  in cw1200_spi_probe()
387 	self->reset = devm_gpiod_get_optional(&func->dev, "reset", GPIOD_OUT_HIGH);  in cw1200_spi_probe()
388 	if (IS_ERR(self->reset))  in cw1200_spi_probe()
389 		return dev_err_probe(&func->dev, PTR_ERR(self->reset),  in cw1200_spi_probe()
390 				     "could not get reset GPIO\n");  in cw1200_spi_probe()
391 	gpiod_set_consumer_name(self->reset, "cw1200_wlan_reset");  in cw1200_spi_probe()
393 	self->powerup = devm_gpiod_get_optional(&func->dev, "powerup", GPIOD_OUT_LOW);  in cw1200_spi_probe()
394 	if (IS_ERR(self->powerup))  in cw1200_spi_probe()
395 		return dev_err_probe(&func->dev, PTR_ERR(self->powerup),  in cw1200_spi_probe()
397 	gpiod_set_consumer_name(self->reset, "cw1200_wlan_powerup");  in cw1200_spi_probe()
401 		return -ENODEV;  in cw1200_spi_probe()
406 		return -ENODEV;  in cw1200_spi_probe()
409 	self->pdata = plat_data;  in cw1200_spi_probe()
410 	self->func = func;  in cw1200_spi_probe()
411 	spin_lock_init(&self->lock);  in cw1200_spi_probe()
415 	init_waitqueue_head(&self->wq);  in cw1200_spi_probe()
420 				   self, &func->dev, &self->core,  in cw1200_spi_probe()
421 				   self->pdata->ref_clk,  in cw1200_spi_probe()
422 				   self->pdata->macaddr,  in cw1200_spi_probe()
423 				   self->pdata->sdd_file,  in cw1200_spi_probe()
424 				   self->pdata->have_5ghz);  in cw1200_spi_probe()
441 		if (self->core) {  in cw1200_spi_disconnect()
442 			cw1200_core_release(self->core);  in cw1200_spi_disconnect()
443 			self->core = NULL;  in cw1200_spi_disconnect()
446 	cw1200_spi_off(self, dev_get_platdata(&func->dev));  in cw1200_spi_disconnect()
453 	if (!cw1200_can_suspend(self->core))  in cw1200_spi_suspend()
454 		return -EAGAIN;  in cw1200_spi_suspend()
463 	.probe		= cw1200_spi_probe,