13f66507af
MMIO operations are arch-agnostic so the include path should not be arch/. Change-Id: I0fd70f5aeca02e98e96b980c3aca0819f5c44b98 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/31691 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License or (at your option)
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* 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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*
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* Helpers to multiplex and configure pins on Allwinner SoCs
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*
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*/
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#include "gpio.h"
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#include <device/mmio.h>
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static struct a10_gpio *const gpio = (void *)GPIO_BASE;
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/**
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* \brief Set the pad function of a single pin
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*
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* @param[in] port GPIO port of the pin (GPA -> GPS)
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* @param[in] pin the pin number in the given port (1 -> 31)
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* @param[in] pad_func The peripheral function to which to connect this pin
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*/
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void gpio_set_pin_func(u8 port, u8 pin, u8 pad_func)
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{
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u8 reg, bit;
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u32 reg32;
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if ((port > GPS))
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return;
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pin &= 0x1f;
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reg = pin / 8;
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bit = (pin % 8) * 4;
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reg32 = read32(&gpio->port[port].cfg[reg]);
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reg32 &= ~(0xf << bit);
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reg32 |= (pad_func & 0xf) << bit;
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write32(&gpio->port[port].cfg[reg], reg32);
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}
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/**
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* \brief Set the pad function of a group of pins
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*
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* Multiplex a group of pins to the same pad function. This is useful for
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* peripherals that use the same function number for several pins. This function
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* allows those pins to be set with a single call.
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*
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* Example:
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* gpio_set_multipin_func(GPB, (1 << 23) | (1 << 22), 2);
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*
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* @param[in] port GPIO port of the pin (GPA -> GPS)
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* @param[in] pin_mask 32-bit mask indicating which pins to re-multiplex. For
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* each set bit, the corresponding pin will be multiplexed.
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* @param[in] pad_func The peripheral function to which to connect the pins
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*/
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void gpio_set_multipin_func(u8 port, u32 pin_mask, u8 pad_func)
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{
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int j;
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u8 reg, bit;
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u32 reg32, mask_offset;
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if ((port > GPS))
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return;
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for (reg = 0; reg < 4; reg++) {
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mask_offset = 8 * reg;
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/* Don't run the inner loop if we're not touching any pins */
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if (!(pin_mask & (0xff << mask_offset)))
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continue;
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reg32 = read32(&gpio->port[port].cfg[reg]);
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for (j = 0; j < 8; j++) {
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if (!(pin_mask & (1 << (j + mask_offset))))
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continue;
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bit = j * 4;
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reg32 &= ~(0xf << bit);
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reg32 |= (pad_func & 0xf) << bit;
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}
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write32(&gpio->port[port].cfg[reg], reg32);
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}
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}
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