1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2007-2009  Andres Salomon <dilinger@collabora.co.uk>
17 #define DRV_NAME "cs5535-gpio"
21  *  31-29,23 : reserved (always mask out)
24  *  22-16    : LPC
33  * If a mask was not specified, allow all except
38 static ulong mask = GPIO_DEFAULT_MASK;  variable
39 module_param_named(mask, mask, ulong, 0444);
40 MODULE_PARM_DESC(mask, "GPIO channel mask.");
44  * design pattern, see Documentation/driver-api/driver-model/design-patterns.rst
63 	unsigned long addr = chip->base + 0x80 + reg;  in errata_outl()
68 	 * non-selected bits; the recommended workaround is a  in errata_outl()
69 	 * read-modify-write operation.  in errata_outl()
88 		outl(1 << offset, chip->base + reg);  in __cs5535_gpio_set()
91 		errata_outl(chip, 1 << (offset - 16), reg);  in __cs5535_gpio_set()
97 	unsigned long flags;  in cs5535_gpio_set()  local
99 	spin_lock_irqsave(&chip->lock, flags);  in cs5535_gpio_set()
101 	spin_unlock_irqrestore(&chip->lock, flags);  in cs5535_gpio_set()
110 		outl(1 << (offset + 16), chip->base + reg);  in __cs5535_gpio_clear()
119 	unsigned long flags;  in cs5535_gpio_clear()  local
121 	spin_lock_irqsave(&chip->lock, flags);  in cs5535_gpio_clear()
123 	spin_unlock_irqrestore(&chip->lock, flags);  in cs5535_gpio_clear()
130 	unsigned long flags;  in cs5535_gpio_isset()  local
133 	spin_lock_irqsave(&chip->lock, flags);  in cs5535_gpio_isset()
136 		val = inl(chip->base + reg);  in cs5535_gpio_isset()
139 		val = inl(chip->base + 0x80 + reg);  in cs5535_gpio_isset()
140 		offset -= 16;  in cs5535_gpio_isset()
142 	spin_unlock_irqrestore(&chip->lock, flags);  in cs5535_gpio_isset()
153 		return -EINVAL;  in cs5535_gpio_set_irq()
169 	unsigned long flags;  in cs5535_gpio_setup_event()  local
181 	spin_lock_irqsave(&chip->lock, flags);  in cs5535_gpio_setup_event()
182 	val = inl(chip->base + offset);  in cs5535_gpio_setup_event()
194 	outl(val, chip->base + offset);  in cs5535_gpio_setup_event()
195 	spin_unlock_irqrestore(&chip->lock, flags);  in cs5535_gpio_setup_event()
206 	unsigned long flags;  in chip_gpio_request()  local
208 	spin_lock_irqsave(&chip->lock, flags);  in chip_gpio_request()
211 	if ((mask & (1 << offset)) == 0) {  in chip_gpio_request()
212 		dev_info(&chip->pdev->dev,  in chip_gpio_request()
213 			"pin %u is not available (check mask)\n", offset);  in chip_gpio_request()
214 		spin_unlock_irqrestore(&chip->lock, flags);  in chip_gpio_request()
215 		return -EINVAL;  in chip_gpio_request()
225 	spin_unlock_irqrestore(&chip->lock, flags);  in chip_gpio_request()
246 	unsigned long flags;  in chip_direction_input()  local
248 	spin_lock_irqsave(&chip->lock, flags);  in chip_direction_input()
251 	spin_unlock_irqrestore(&chip->lock, flags);  in chip_direction_input()
259 	unsigned long flags;  in chip_direction_output()  local
261 	spin_lock_irqsave(&chip->lock, flags);  in chip_direction_output()
270 	spin_unlock_irqrestore(&chip->lock, flags);  in chip_direction_output()
307 	int err = -EIO;  in cs5535_gpio_probe()
308 	ulong mask_orig = mask;  in cs5535_gpio_probe()
319 		dev_err(&pdev->dev, "can't fetch device resource info\n");  in cs5535_gpio_probe()
323 	if (!devm_request_region(&pdev->dev, res->start, resource_size(res),  in cs5535_gpio_probe()
324 				 pdev->name)) {  in cs5535_gpio_probe()
325 		dev_err(&pdev->dev, "can't request region\n");  in cs5535_gpio_probe()
329 	/* set up the driver-specific struct */  in cs5535_gpio_probe()
330 	cs5535_gpio_chip.base = res->start;  in cs5535_gpio_probe()
334 	dev_info(&pdev->dev, "reserved resource region %pR\n", res);  in cs5535_gpio_probe()
336 	/* mask out reserved pins */  in cs5535_gpio_probe()
337 	mask &= 0x1F7FFFFF;  in cs5535_gpio_probe()
341 	mask &= ~(1 << 28);  in cs5535_gpio_probe()
343 	if (mask_orig != mask)  in cs5535_gpio_probe()
344 		dev_info(&pdev->dev, "mask changed from 0x%08lX to 0x%08lX\n",  in cs5535_gpio_probe()
345 				mask_orig, mask);  in cs5535_gpio_probe()
348 	return devm_gpiochip_add_data(&pdev->dev, &cs5535_gpio_chip.chip,  in cs5535_gpio_probe()