| /* This file is part of the coreboot project. */ |
| /* |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <device/mmio.h> |
| #include <console/console.h> |
| #include <cpu/ti/am335x/gpio.h> |
| #include <stdint.h> |
| |
| static struct am335x_gpio_regs *gpio_regs_and_bit(unsigned int gpio, |
| uint32_t *bit) |
| { |
| unsigned int bank = gpio / AM335X_GPIO_BITS_PER_BANK; |
| |
| if (bank >= ARRAY_SIZE(am335x_gpio_banks)) { |
| printk(BIOS_ERR, "Bad gpio index %d.\n", gpio); |
| return NULL; |
| } |
| *bit = 1 << (gpio % 32); |
| return am335x_gpio_banks[bank]; |
| } |
| |
| void am335x_disable_gpio_irqs(void) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(am335x_gpio_banks); i++) |
| write32(&am335x_gpio_banks[i]->irqstatus_clr_0, 0xffffffff); |
| } |
| |
| int gpio_direction_input(unsigned int gpio) |
| { |
| uint32_t bit; |
| struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit); |
| |
| if (!regs) |
| return -1; |
| setbits32(®s->oe, bit); |
| return 0; |
| } |
| |
| int gpio_direction_output(unsigned int gpio, int value) |
| { |
| uint32_t bit; |
| struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit); |
| |
| if (!regs) |
| return -1; |
| if (value) |
| write32(®s->setdataout, bit); |
| else |
| write32(®s->cleardataout, bit); |
| clrbits32(®s->oe, bit); |
| return 0; |
| } |
| |
| int gpio_get_value(unsigned int gpio) |
| { |
| uint32_t bit; |
| struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit); |
| |
| if (!regs) |
| return -1; |
| return (read32(®s->datain) & bit) ? 1 : 0; |
| } |
| |
| int gpio_set_value(unsigned int gpio, int value) |
| { |
| uint32_t bit; |
| struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit); |
| |
| if (!regs) |
| return -1; |
| if (value) |
| write32(®s->setdataout, bit); |
| else |
| write32(®s->cleardataout, bit); |
| return 0; |
| } |