romstage.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <arch/stages.h>
#include <boardid.h>
#include <soc/emi.h>
#include <soc/mmu_operations.h>
#include <soc/mt6391.h>
#include <soc/pll.h>
#include <soc/rtc.h>
#include <timer.h>
 
void platform_romstage_main(void)
{
        int stabilize_usec;
        struct stopwatch sw;
 
        rtc_boot();
 
        /* Raise CPU voltage to allow higher frequency */
        stabilize_usec = mt6391_configure_ca53_voltage(1125000);
 
        stopwatch_init_usecs_expire(&sw, stabilize_usec);
 
        /* init memory */
        mt_mem_init(get_sdram_config());
 
        stopwatch_wait_until_expired(&sw);
 
        /* Set to maximum frequency */
        if (board_id() + CONFIG_BOARD_ID_ADJUSTMENT < 5)
                mt_pll_raise_little_cpu_freq(1600 * MHz);
        else
                mt_pll_raise_little_cpu_freq(1700 * MHz);
 
        mtk_mmu_after_dram();
}