1 // SPDX-License-Identifier: GPL-2.0
53  * sama5d2_piobu_setup_pin() - prepares a pin for set_direction call
55  * Do not consider pin for tamper detection (normal and backup modes)
56  * Do not consider pin as tamper wakeup interrupt source
58 static int sama5d2_piobu_setup_pin(struct gpio_chip *chip, unsigned int pin)  in sama5d2_piobu_setup_pin()  argument
63 	unsigned int mask = BIT(PIOBU_DET_OFFSET + pin);  in sama5d2_piobu_setup_pin()
65 	ret = regmap_update_bits(piobu->regmap, PIOBU_BMPR, mask, 0);  in sama5d2_piobu_setup_pin()
69 	ret = regmap_update_bits(piobu->regmap, PIOBU_NMPR, mask, 0);  in sama5d2_piobu_setup_pin()
73 	return regmap_update_bits(piobu->regmap, PIOBU_WKPR, mask, 0);  in sama5d2_piobu_setup_pin()
77  * sama5d2_piobu_write_value() - writes value & mask at the pin's PIOBU register
79 static int sama5d2_piobu_write_value(struct gpio_chip *chip, unsigned int pin,  in sama5d2_piobu_write_value()  argument
86 	reg = PIOBU_BASE + pin * PIOBU_REG_SIZE;  in sama5d2_piobu_write_value()
88 	return regmap_update_bits(piobu->regmap, reg, mask, value);  in sama5d2_piobu_write_value()
92  * sama5d2_piobu_read_value() - read the value with masking from the pin's PIOBU
95 static int sama5d2_piobu_read_value(struct gpio_chip *chip, unsigned int pin,  in sama5d2_piobu_read_value()  argument
100 	unsigned int val, reg;  in sama5d2_piobu_read_value()  local
103 	reg = PIOBU_BASE + pin * PIOBU_REG_SIZE;  in sama5d2_piobu_read_value()
104 	ret = regmap_read(piobu->regmap, reg, &val);  in sama5d2_piobu_read_value()
108 	return val & mask;  in sama5d2_piobu_read_value()
112  * sama5d2_piobu_get_direction() - gpiochip get_direction
115 				       unsigned int pin)  in sama5d2_piobu_get_direction()  argument
117 	int ret = sama5d2_piobu_read_value(chip, pin, PIOBU_DIRECTION);  in sama5d2_piobu_get_direction()
127  * sama5d2_piobu_direction_input() - gpiochip direction_input
130 					 unsigned int pin)  in sama5d2_piobu_direction_input()  argument
132 	return sama5d2_piobu_write_value(chip, pin, PIOBU_DIRECTION, PIOBU_IN);  in sama5d2_piobu_direction_input()
136  * sama5d2_piobu_direction_output() - gpiochip direction_output
139 					  unsigned int pin, int value)  in sama5d2_piobu_direction_output()  argument
141 	unsigned int val = PIOBU_OUT;  in sama5d2_piobu_direction_output()  local
144 		val |= PIOBU_HIGH;  in sama5d2_piobu_direction_output()
146 	return sama5d2_piobu_write_value(chip, pin, PIOBU_DIRECTION | PIOBU_SOD,  in sama5d2_piobu_direction_output()
147 					 val);  in sama5d2_piobu_direction_output()
151  * sama5d2_piobu_get() - gpiochip get
153 static int sama5d2_piobu_get(struct gpio_chip *chip, unsigned int pin)  in sama5d2_piobu_get()  argument
155 	/* if pin is input, read value from PDS else read from SOD */  in sama5d2_piobu_get()
156 	int ret = sama5d2_piobu_get_direction(chip, pin);  in sama5d2_piobu_get()
159 		ret = sama5d2_piobu_read_value(chip, pin, PIOBU_PDS);  in sama5d2_piobu_get()
161 		ret = sama5d2_piobu_read_value(chip, pin, PIOBU_SOD);  in sama5d2_piobu_get()
170  * sama5d2_piobu_set() - gpiochip set
172 static void sama5d2_piobu_set(struct gpio_chip *chip, unsigned int pin,  in sama5d2_piobu_set()  argument
180 	sama5d2_piobu_write_value(chip, pin, PIOBU_SOD, value);  in sama5d2_piobu_set()
188 	piobu = devm_kzalloc(&pdev->dev, sizeof(*piobu), GFP_KERNEL);  in sama5d2_piobu_probe()
190 		return -ENOMEM;  in sama5d2_piobu_probe()
193 	piobu->chip.label = pdev->name;  in sama5d2_piobu_probe()
194 	piobu->chip.parent = &pdev->dev;  in sama5d2_piobu_probe()
195 	piobu->chip.owner = THIS_MODULE,  in sama5d2_piobu_probe()
196 	piobu->chip.get_direction = sama5d2_piobu_get_direction,  in sama5d2_piobu_probe()
197 	piobu->chip.direction_input = sama5d2_piobu_direction_input,  in sama5d2_piobu_probe()
198 	piobu->chip.direction_output = sama5d2_piobu_direction_output,  in sama5d2_piobu_probe()
199 	piobu->chip.get = sama5d2_piobu_get,  in sama5d2_piobu_probe()
200 	piobu->chip.set = sama5d2_piobu_set,  in sama5d2_piobu_probe()
201 	piobu->chip.base = -1,  in sama5d2_piobu_probe()
202 	piobu->chip.ngpio = PIOBU_NUM,  in sama5d2_piobu_probe()
203 	piobu->chip.can_sleep = 0,  in sama5d2_piobu_probe()
205 	piobu->regmap = syscon_node_to_regmap(pdev->dev.of_node);  in sama5d2_piobu_probe()
206 	if (IS_ERR(piobu->regmap)) {  in sama5d2_piobu_probe()
207 		dev_err(&pdev->dev, "Failed to get syscon regmap %ld\n",  in sama5d2_piobu_probe()
208 			PTR_ERR(piobu->regmap));  in sama5d2_piobu_probe()
209 		return PTR_ERR(piobu->regmap);  in sama5d2_piobu_probe()
212 	ret = devm_gpiochip_add_data(&pdev->dev, &piobu->chip, piobu);  in sama5d2_piobu_probe()
214 		dev_err(&pdev->dev, "Failed to add gpiochip %d\n", ret);  in sama5d2_piobu_probe()
219 		ret = sama5d2_piobu_setup_pin(&piobu->chip, i);  in sama5d2_piobu_probe()
221 			dev_err(&pdev->dev, "Failed to setup pin: %d %d\n",  in sama5d2_piobu_probe()
231 	{ .compatible = "atmel,sama5d2-secumod" },
238 		.name		= "sama5d2-piobu",