bootblock.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/acpimmio.h>
#include <bootblock_common.h>
#include <device/pnp_type.h>
#include <superio/ite/common/ite.h>
#include <superio/ite/it8728f/it8728f.h>
 
static void sbxxx_enable_48mhzout(void)
{
        /* Set auxiliary output clock frequency on OSCOUT2 pin to be 48MHz */
        u32 reg32;
        reg32 = misc_read32(0x28);
        reg32 &= ~(7 << 19);
        reg32 |=  (2 << 19);
        misc_write32(0x28, reg32);
 
        /* Enable Auxiliary OSCOUT2 */
        misc_write32(0x40, misc_read32(0x40) & ~(1 << 7));
}
 
static void superio_init_m(void)
{
        const pnp_devfn_t uart = PNP_DEV(0x2e, IT8728F_SP1);
        const pnp_devfn_t gpio = PNP_DEV(0x2e, IT8728F_GPIO);
 
        ite_kill_watchdog(gpio);
        ite_enable_serial(uart, CONFIG_TTYS0_BASE);
        ite_enable_3vsbsw(gpio);
}
 
void bootblock_mainboard_early_init(void)
{
        /* enable SIO clock */
        sbxxx_enable_48mhzout();
 
        superio_init_m();
}