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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/device.h>
#include <asm/arch/quark.h>
/*
* Intel Galileo gen2 board uses GPIO Resume Well bank pin0 as the PERST# pin.
*
* We cannot use any public GPIO APIs in <asm-generic/gpio.h> to control this
* pin, as these APIs will eventually call into gpio_ich6_ofdata_to_platdata()
* in the Intel ICH6 GPIO driver where it calls PCI configuration space access
* APIs which will trigger PCI enumeration process.
*
* Check <asm/arch-quark/quark.h> for more details.
*/
void board_assert_perst(void)
{
u32 base, port, val;
/* retrieve the GPIO IO base */
qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA, &base);
base = (base & 0xffff) & ~0x7f;
/* enable the pin */
port = base + 0x20;
val = inl(port);
val |= (1 << 0);
outl(val, port);
/* configure the pin as output */
port = base + 0x24;
val = inl(port);
val &= ~(1 << 0);
outl(val, port);
/* pull it down (assert) */
port = base + 0x28;
val = inl(port);
val &= ~(1 << 0);
outl(val, port);
}
void board_deassert_perst(void)
{
u32 base, port, val;
/* retrieve the GPIO IO base */
qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA, &base);
base = (base & 0xffff) & ~0x7f;
/* pull it up (de-assert) */
port = base + 0x28;
val = inl(port);
val |= (1 << 0);
outl(val, port);
}
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