1 // SPDX-License-Identifier: GPL-2.0+
3  * Freescale MPC83xx GPIO handling.
8 #include <asm/gpio.h>
36 int gpio_request(unsigned gpio, const char *label)  in gpio_request()  argument
38 	if (gpio >= MAX_NUM_GPIOS)  in gpio_request()
39 		return -1;  in gpio_request()
44 int gpio_free(unsigned gpio)  in gpio_free()  argument
50 /* set GPIO pin 'gpio' as an input */
51 int gpio_direction_input(unsigned gpio)  in gpio_direction_input()  argument
55 	unsigned int line;  in gpio_direction_input()  local
58 	/* 32-bits per controller */  in gpio_direction_input()
59 	ctrlr = gpio >> 5;  in gpio_direction_input()
60 	line = gpio & (0x1F);  in gpio_direction_input()
63 	line_mask = 1 << (31 - line);  in gpio_direction_input()
65 	clrbits_be32(&im->gpio[ctrlr].dir, line_mask);  in gpio_direction_input()
70 /* set GPIO pin 'gpio' as an output, with polarity 'value' */
71 int gpio_direction_output(unsigned gpio, int value)  in gpio_direction_output()  argument
75 	unsigned int line;  in gpio_direction_output()  local
80 		return -1;  in gpio_direction_output()
83 	gpio_set_value(gpio, value);  in gpio_direction_output()
85 	/* 32-bits per controller */  in gpio_direction_output()
86 	ctrlr = gpio >> 5;  in gpio_direction_output()
87 	line = gpio & (0x1F);  in gpio_direction_output()
90 	line_mask = 1 << (31 - line);  in gpio_direction_output()
92 	/* Make the line output */  in gpio_direction_output()
93 	setbits_be32(&im->gpio[ctrlr].dir, line_mask);  in gpio_direction_output()
98 /* read GPIO IN value of pin 'gpio' */
99 int gpio_get_value(unsigned gpio)  in gpio_get_value()  argument
103 	unsigned int line;  in gpio_get_value()  local
106 	/* 32-bits per controller */  in gpio_get_value()
107 	ctrlr = gpio >> 5;  in gpio_get_value()
108 	line = gpio & (0x1F);  in gpio_get_value()
111 	line_mask = 1 << (31 - line);  in gpio_get_value()
114 	return (in_be32(&im->gpio[ctrlr].dat) & line_mask) != 0;  in gpio_get_value()
117 /* write GPIO OUT value to pin 'gpio' */
118 int gpio_set_value(unsigned gpio, int value)  in gpio_set_value()  argument
122 	unsigned int line;  in gpio_set_value()  local
127 		return -1;  in gpio_set_value()
130 	/* 32-bits per controller */  in gpio_set_value()
131 	ctrlr = gpio >> 5;  in gpio_set_value()
132 	line = gpio & (0x1F);  in gpio_set_value()
135 	line_mask = 1 << (31 - line);  in gpio_set_value()
143 	out_be32(&im->gpio[ctrlr].dat, gpio_output_value[ctrlr]);  in gpio_set_value()
148 /* Configure GPIO registers early */
154 	out_be32(&im->gpio[0].dir, CONFIG_MPC83XX_GPIO_0_INIT_DIRECTION);  in mpc83xx_gpio_init_f()
155 	out_be32(&im->gpio[0].odr, CONFIG_MPC83XX_GPIO_0_INIT_OPEN_DRAIN);  in mpc83xx_gpio_init_f()
156 	out_be32(&im->gpio[0].dat, CONFIG_MPC83XX_GPIO_0_INIT_VALUE);  in mpc83xx_gpio_init_f()
157 	out_be32(&im->gpio[0].ier, 0xFFFFFFFF); /* Clear all events */  in mpc83xx_gpio_init_f()
158 	out_be32(&im->gpio[0].imr, 0);  in mpc83xx_gpio_init_f()
159 	out_be32(&im->gpio[0].icr, 0);  in mpc83xx_gpio_init_f()
163 	out_be32(&im->gpio[1].dir, CONFIG_MPC83XX_GPIO_1_INIT_DIRECTION);  in mpc83xx_gpio_init_f()
164 	out_be32(&im->gpio[1].odr, CONFIG_MPC83XX_GPIO_1_INIT_OPEN_DRAIN);  in mpc83xx_gpio_init_f()
165 	out_be32(&im->gpio[1].dat, CONFIG_MPC83XX_GPIO_1_INIT_VALUE);  in mpc83xx_gpio_init_f()
166 	out_be32(&im->gpio[1].ier, 0xFFFFFFFF); /* Clear all events */  in mpc83xx_gpio_init_f()
167 	out_be32(&im->gpio[1].imr, 0);  in mpc83xx_gpio_init_f()
168 	out_be32(&im->gpio[1].icr, 0);  in mpc83xx_gpio_init_f()
172 /* Initialize GPIO soft-copies */