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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * Copyright (C) 2012 Stefan Roese <sr (at) denx.de>
      4  */
      5 
      6 /*
      7  * Driver for SPEAr600 GPIO controller
      8  */
      9 
     10 #include <common.h>
     11 #include <asm/arch/hardware.h>
     12 #include <asm/gpio.h>
     13 #include <asm/io.h>
     14 #include <errno.h>
     15 
     16 static int gpio_direction(unsigned gpio,
     17 			  enum gpio_direction direction)
     18 {
     19 	struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
     20 	u32 val;
     21 
     22 	val = readl(&regs->gpiodir);
     23 
     24 	if (direction == GPIO_DIRECTION_OUT)
     25 		val |= 1 << gpio;
     26 	else
     27 		val &= ~(1 << gpio);
     28 
     29 	writel(val, &regs->gpiodir);
     30 
     31 	return 0;
     32 }
     33 
     34 int gpio_set_value(unsigned gpio, int value)
     35 {
     36 	struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
     37 
     38 	if (value)
     39 		writel(1 << gpio, &regs->gpiodata[DATA_REG_ADDR(gpio)]);
     40 	else
     41 		writel(0, &regs->gpiodata[DATA_REG_ADDR(gpio)]);
     42 
     43 	return 0;
     44 }
     45 
     46 int gpio_get_value(unsigned gpio)
     47 {
     48 	struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
     49 	u32 val;
     50 
     51 	val = readl(&regs->gpiodata[DATA_REG_ADDR(gpio)]);
     52 
     53 	return !!val;
     54 }
     55 
     56 int gpio_request(unsigned gpio, const char *label)
     57 {
     58 	if (gpio >= SPEAR_GPIO_COUNT)
     59 		return -EINVAL;
     60 
     61 	return 0;
     62 }
     63 
     64 int gpio_free(unsigned gpio)
     65 {
     66 	return 0;
     67 }
     68 
     69 void gpio_toggle_value(unsigned gpio)
     70 {
     71 	gpio_set_value(gpio, !gpio_get_value(gpio));
     72 }
     73 
     74 int gpio_direction_input(unsigned gpio)
     75 {
     76 	return gpio_direction(gpio, GPIO_DIRECTION_IN);
     77 }
     78 
     79 int gpio_direction_output(unsigned gpio, int value)
     80 {
     81 	int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
     82 
     83 	if (ret < 0)
     84 		return ret;
     85 
     86 	gpio_set_value(gpio, value);
     87 	return 0;
     88 }
     89