/*
 * Copyright (c) 2018 naehrwert
 * Copyright (c) 2018-2019 Atmosphère-NX
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdint.h>

#include "cluster.h"
#include "flow.h"
#include "sysreg.h"
#include "i2c.h"
#include "car.h"
#include "mc.h"
#include "timers.h"
#include "pmc.h"
#include "max77620.h"

void _cluster_enable_power()
{
    /* Reboot I2C5. */
    clkrst_reboot(CARDEVICE_I2C5);
    i2c_init(I2C_5);

    uint8_t val = 0;
    i2c_query(I2C_5, MAX77620_PWR_I2C_ADDR, MAX77620_REG_AME_GPIO, &val, 1);

    val &= 0xDF;
    i2c_send(I2C_5, MAX77620_PWR_I2C_ADDR, MAX77620_REG_AME_GPIO, &val, 1);
    val = 0x09;
    i2c_send(I2C_5, MAX77620_PWR_I2C_ADDR, MAX77620_REG_GPIO5, &val, 1);

    /* Enable power. */
    val = 0x20;
    i2c_send(I2C_5, MAX77621_CPU_I2C_ADDR, 0x02, &val, 1);
    val = 0x8D;
    i2c_send(I2C_5, MAX77621_CPU_I2C_ADDR, 0x03, &val, 1);
    val = 0xB7;
    i2c_send(I2C_5, MAX77621_CPU_I2C_ADDR, 0x00, &val, 1);
    val = 0xB7;
    i2c_send(I2C_5, MAX77621_CPU_I2C_ADDR, 0x01, &val, 1);
}

int _cluster_pmc_enable_partition(uint32_t part, uint32_t toggle)
{
    volatile tegra_pmc_t *pmc = pmc_get_regs();

    /* Check if the partition has already been turned on. */
    if (pmc->pwrgate_status & part)
        return 1;

    uint32_t i = 5001;
    while (pmc->pwrgate_toggle & 0x100)
    {
        udelay(1);
        i--;
        if (i < 1)
            return 0;
    }

    pmc->pwrgate_toggle = (toggle | 0x100);

    i = 5001;
    while (i > 0)
    {
        if (pmc->pwrgate_status & part)
            break;

        udelay(1);
        i--;
    }

    return 1;
}

void cluster_boot_cpu0(uint32_t entry)
{
    volatile tegra_car_t *car = car_get_regs();

    /* Set ACTIVE_CLUSER to FAST. */
    FLOW_CTLR_BPMP_CLUSTER_CONTROL_0 &= 0xFFFFFFFE;

    _cluster_enable_power();

    if (!(car->pllx_base & 0x40000000))
    {
        car->pllx_misc3 &= 0xFFFFFFF7;
        udelay(2);
        car->pllx_base = 0x80404E02;
        car->pllx_base = 0x404E02;
        car->pllx_misc = ((car->pllx_misc & 0xFFFBFFFF) | 0x40000);
        car->pllx_base = 0x40404E02;
    }

    while (!(car->pllx_base & 0x8000000)) {
        /* Wait. */
    }

    /* Configure MSELECT source and enable clock. */
    car->clk_source_mselect = ((car->clk_source_mselect & 0x1FFFFF00) | 6);
    car->clk_out_enb_v = ((car->clk_out_enb_v & 0xFFFFFFF7) | 8);

    /* Configure initial CPU clock frequency and enable clock. */
    car->cclk_brst_pol = 0x20008888;
    car->super_cclk_div = 0x80000000;
    car->clk_enb_v_set = 1;

    clkrst_reboot(CARDEVICE_CORESIGHT);

    /* CAR2PMC_CPU_ACK_WIDTH should be set to 0. */
    car->cpu_softrst_ctrl2 &= 0xFFFFF000;

    /* Enable CPU rail. */
    _cluster_pmc_enable_partition(1, 0);

    /* Enable cluster 0 non-CPU. */
    _cluster_pmc_enable_partition(0x8000, 15);

    /* Enable CE0. */
    _cluster_pmc_enable_partition(0x4000, 14);

    /* Request and wait for RAM repair. */
    FLOW_CTLR_RAM_REPAIR_0 = 1;
    while (!(FLOW_CTLR_RAM_REPAIR_0 & 2)) {
        /* Wait. */
    }

    MAKE_EXCP_VEC_REG(0x100) = 0;

    /* Check for reset vector lock. */
    if (SB_CSR_0 & 2) {
        generic_panic();
    }

    /* Set reset vector. */
    SB_AA64_RESET_LOW_0 = (entry | 1);
    SB_AA64_RESET_HIGH_0 = 0;

    /* Non-secure reset vector write disable. */
    SB_CSR_0 = 2;
    (void)SB_CSR_0;

    /* Validate reset vector lock + RESET_LOW/HIGH values. */
    if (!(SB_CSR_0 & 2)) {
        generic_panic();
    }

    /* TODO: Should we even bother taking as a parameter? */
    if (SB_AA64_RESET_LOW_0 != (0x4003D000 | 1) || SB_AA64_RESET_HIGH_0 != 0) {
        generic_panic();
    }

    /* Set CPU_STRICT_TZ_APERTURE_CHECK. */
    /* NOTE: [4.0.0+] This was added, but it breaks Exosphère. */
    /* MAKE_MC_REG(MC_TZ_SECURITY_CTRL) = 1; */

    /* Clear MSELECT reset. */
    car->rst_dev_v &= 0xFFFFFFF7;

    /* Clear NONCPU reset. */
    car->rst_cpug_cmplx_clr = 0x20000000;

    /* Clear CPU{0,1,2,3} POR and CORE, CX0, L2, and DBG reset.*/
    /* NOTE: [5.0.0+] This was changed so only CPU0 reset is cleared. */
    /* car->rst_cpug_cmplx_clr = 0x411F000F; */
    car->rst_cpug_cmplx_clr = 0x41010001;
}