90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <device/mmio.h>
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#include <console/console.h>
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#include <cpu/ti/am335x/gpio.h>
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#include <stdint.h>
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static struct am335x_gpio_regs *gpio_regs_and_bit(unsigned int gpio,
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uint32_t *bit)
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{
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unsigned int bank = gpio / AM335X_GPIO_BITS_PER_BANK;
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if (bank >= ARRAY_SIZE(am335x_gpio_banks)) {
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printk(BIOS_ERR, "Bad gpio index %d.\n", gpio);
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return NULL;
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}
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*bit = 1 << (gpio % 32);
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return am335x_gpio_banks[bank];
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}
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void am335x_disable_gpio_irqs(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(am335x_gpio_banks); i++)
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write32(&am335x_gpio_banks[i]->irqstatus_clr_0, 0xffffffff);
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}
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int gpio_direction_input(unsigned int gpio)
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{
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uint32_t bit;
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struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit);
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if (!regs)
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return -1;
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setbits_le32(®s->oe, bit);
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return 0;
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}
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int gpio_direction_output(unsigned int gpio, int value)
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{
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uint32_t bit;
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struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit);
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if (!regs)
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return -1;
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if (value)
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write32(®s->setdataout, bit);
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else
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write32(®s->cleardataout, bit);
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clrbits_le32(®s->oe, bit);
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return 0;
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}
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int gpio_get_value(unsigned int gpio)
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{
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uint32_t bit;
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struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit);
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if (!regs)
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return -1;
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return (read32(®s->datain) & bit) ? 1 : 0;
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}
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int gpio_set_value(unsigned int gpio, int value)
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{
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uint32_t bit;
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struct am335x_gpio_regs *regs = gpio_regs_and_bit(gpio, &bit);
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if (!regs)
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return -1;
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if (value)
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write32(®s->setdataout, bit);
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else
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write32(®s->cleardataout, bit);
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return 0;
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}
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