2 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <asm/arch/device.h>
10 #include <asm/arch/quark.h>
13 * Intel Galileo gen2 board uses GPIO Resume Well bank pin0 as the PERST# pin.
15 * We cannot use any public GPIO APIs in <asm-generic/gpio.h> to control this
16 * pin, as these APIs will eventually call into gpio_ich6_ofdata_to_platdata()
17 * in the Intel ICH6 GPIO driver where it calls PCI configuration space access
18 * APIs which will trigger PCI enumeration process.
20 * Check <asm/arch-quark/quark.h> for more details.
22 void board_assert_perst(void)
26 /* retrieve the GPIO IO base */
27 qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA, &base);
28 base = (base & 0xffff) & ~0x7f;
36 /* configure the pin as output */
42 /* pull it down (assert) */
49 void board_deassert_perst(void)
53 /* retrieve the GPIO IO base */
54 qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA, &base);
55 base = (base & 0xffff) & ~0x7f;
57 /* pull it up (de-assert) */