// SPDX-License-Identifier: GPL-2.0
/*
 * RZ/V2N System controller (SYS) driver
 *
 * Copyright (C) 2025 Renesas Electronics Corp.
 */

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/io.h>

#include "rz-sysc.h"

/* Register Offsets */
#define SYS_LSI_MODE            0x300
#define SYS_LSI_MODE_SEC_EN     BIT(16)
/*
 * BOOTPLLCA[1:0]
 *          [0,0] => 1.1GHZ
 *          [0,1] => 1.5GHZ
 *          [1,0] => 1.6GHZ
 *          [1,1] => 1.7GHZ
 */
#define SYS_LSI_MODE_STAT_BOOTPLLCA55   GENMASK(12, 11)
#define SYS_LSI_MODE_CA55_1_7GHZ        0x3

#define SYS_LSI_PRR                     0x308
#define SYS_LSI_PRR_GPU_DIS             BIT(0)
#define SYS_LSI_PRR_ISP_DIS             BIT(4)

#define SYS_RZV2N_FEATURE_G31           BIT(0)
#define SYS_RZV2N_FEATURE_C55           BIT(1)
#define SYS_RZV2N_FEATURE_SEC           BIT(2)

#define SYS_LSI_OTPTSU0TRMVAL0          0x320
#define SYS_LSI_OTPTSU0TRMVAL1          0x324
#define SYS_LSI_OTPTSU1TRMVAL0          0x330
#define SYS_LSI_OTPTSU1TRMVAL1          0x334
#define SYS_GBETH0_CFG                  0xf00
#define SYS_GBETH1_CFG                  0xf04
#define SYS_PCIE_INTX_CH0               0x1000
#define SYS_PCIE_MSI1_CH0               0x1004
#define SYS_PCIE_MSI2_CH0               0x1008
#define SYS_PCIE_MSI3_CH0               0x100c
#define SYS_PCIE_MSI4_CH0               0x1010
#define SYS_PCIE_MSI5_CH0               0x1014
#define SYS_PCIE_PME_CH0                0x1018
#define SYS_PCIE_ACK_CH0                0x101c
#define SYS_PCIE_MISC_CH0               0x1020
#define SYS_PCIE_MODE_CH0               0x1024
#define SYS_ADC_CFG                     0x1600

static void rzv2n_sys_print_id(struct device *dev,
                               void __iomem *sysc_base,
                               struct soc_device_attribute *soc_dev_attr)
{
        u32 prr_val, mode_val;
        u8 feature_flags;

        prr_val = readl(sysc_base + SYS_LSI_PRR);
        mode_val = readl(sysc_base + SYS_LSI_MODE);

        /* Check GPU, ISP and Cryptographic configuration */
        feature_flags = !(prr_val & SYS_LSI_PRR_GPU_DIS) ? SYS_RZV2N_FEATURE_G31 : 0;
        feature_flags |= !(prr_val & SYS_LSI_PRR_ISP_DIS) ? SYS_RZV2N_FEATURE_C55 : 0;
        feature_flags |= (mode_val & SYS_LSI_MODE_SEC_EN) ? SYS_RZV2N_FEATURE_SEC : 0;

        dev_info(dev, "Detected Renesas %s %sn%d Rev %s%s%s%s%s\n", soc_dev_attr->family,
                 soc_dev_attr->soc_id, 41 + feature_flags, soc_dev_attr->revision,
                 feature_flags ?  " with" : "",
                 feature_flags & SYS_RZV2N_FEATURE_G31 ? " GE3D (Mali-G31)" : "",
                 feature_flags & SYS_RZV2N_FEATURE_SEC ? " Cryptographic engine" : "",
                 feature_flags & SYS_RZV2N_FEATURE_C55 ? " ISP (Mali-C55)" : "");

        /* Check CA55 PLL configuration */
        if (FIELD_GET(SYS_LSI_MODE_STAT_BOOTPLLCA55, mode_val) != SYS_LSI_MODE_CA55_1_7GHZ)
                dev_warn(dev, "CA55 PLL is not set to 1.7GHz\n");
}

static const struct rz_sysc_soc_id_init_data rzv2n_sys_soc_id_init_data __initconst = {
        .family = "RZ/V2N",
        .id = 0x867d447,
        .devid_offset = 0x304,
        .revision_mask = GENMASK(31, 28),
        .specific_id_mask = GENMASK(27, 0),
        .print_id = rzv2n_sys_print_id,
};

static bool rzv2n_regmap_readable_reg(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case SYS_LSI_OTPTSU0TRMVAL0:
        case SYS_LSI_OTPTSU0TRMVAL1:
        case SYS_LSI_OTPTSU1TRMVAL0:
        case SYS_LSI_OTPTSU1TRMVAL1:
        case SYS_GBETH0_CFG:
        case SYS_GBETH1_CFG:
        case SYS_PCIE_INTX_CH0:
        case SYS_PCIE_MSI1_CH0:
        case SYS_PCIE_MSI2_CH0:
        case SYS_PCIE_MSI3_CH0:
        case SYS_PCIE_MSI4_CH0:
        case SYS_PCIE_MSI5_CH0:
        case SYS_PCIE_PME_CH0:
        case SYS_PCIE_ACK_CH0:
        case SYS_PCIE_MISC_CH0:
        case SYS_PCIE_MODE_CH0:
        case SYS_ADC_CFG:
                return true;
        default:
                return false;
        }
}

static bool rzv2n_regmap_writeable_reg(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case SYS_GBETH0_CFG:
        case SYS_GBETH1_CFG:
        case SYS_PCIE_INTX_CH0:
        case SYS_PCIE_MSI1_CH0:
        case SYS_PCIE_MSI2_CH0:
        case SYS_PCIE_MSI3_CH0:
        case SYS_PCIE_MSI4_CH0:
        case SYS_PCIE_MSI5_CH0:
        case SYS_PCIE_PME_CH0:
        case SYS_PCIE_ACK_CH0:
        case SYS_PCIE_MISC_CH0:
        case SYS_PCIE_MODE_CH0:
        case SYS_ADC_CFG:
                return true;
        default:
                return false;
        }
}

const struct rz_sysc_init_data rzv2n_sys_init_data = {
        .soc_id_init_data = &rzv2n_sys_soc_id_init_data,
        .readable_reg = rzv2n_regmap_readable_reg,
        .writeable_reg = rzv2n_regmap_writeable_reg,
        .max_register = 0x170c,
};