// SPDX-License-Identifier: GPL-2.0
/*
 * Qualcomm MSM Camera Subsystem - CSID (CSI Decoder) Module 340
 *
 * Copyright (c) 2025 Qualcomm Innovation Center, Inc. All rights reserved.
 */

#include <linux/completion.h>
#include <linux/bitfield.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>

#include "camss.h"
#include "camss-csid.h"
#include "camss-csid-gen2.h"

#define CSID_RST_STROBES                                        (0x010)
#define         CSID_RST_SW_REGS                        BIT(0)
#define         CSID_RST_IRQ                            BIT(1)
#define CSID_RST_IFE_CLK                                BIT(2)
#define         CSID_RST_PHY_CLK                        BIT(3)
#define         CSID_RST_CSID_CLK                       BIT(4)

#define CSID_IRQ_STATUS                                         (0x070)
#define CSID_IRQ_MASK                                           (0x074)
#define         CSID_IRQ_MASK_RST_DONE                  BIT(0)
#define CSID_IRQ_CLEAR                                          (0x078)
#define CSID_IRQ_CMD                                            (0x080)
#define         CSID_IRQ_CMD_CLEAR                      BIT(0)

#define CSID_CSI2_RX_CFG0                                       (0x100)
#define         CSI2_RX_CFG0_NUM_ACTIVE_LANES_MASK      GENMASK(1, 0)
#define         CSI2_RX_CFG0_DLX_INPUT_SEL_MASK         GENMASK(17, 4)
#define         CSI2_RX_CFG0_PHY_NUM_SEL_MASK           GENMASK(21, 20)
#define         CSI2_RX_CFG0_PHY_NUM_SEL_BASE_IDX       1
#define         CSI2_RX_CFG0_PHY_TYPE_SEL               BIT(24)

#define CSID_CSI2_RX_CFG1                                       (0x104)
#define         CSI2_RX_CFG1_PACKET_ECC_CORRECTION_EN   BIT(0)
#define         CSI2_RX_CFG1_MISR_EN                    BIT(6)
#define         CSI2_RX_CFG1_CGC_MODE                   BIT(7)

#define CSID_RDI_CFG0(rdi)                                      (0x300 + 0x100 * (rdi))
#define         CSID_RDI_CFG0_BYTE_CNTR_EN              BIT(0)
#define         CSID_RDI_CFG0_TIMESTAMP_EN              BIT(1)
#define         CSID_RDI_CFG0_DECODE_FORMAT_MASK        GENMASK(15, 12)
#define         CSID_RDI_CFG0_DECODE_FORMAT_NOP         CSID_RDI_CFG0_DECODE_FORMAT_MASK
#define         CSID_RDI_CFG0_DT_MASK                   GENMASK(21, 16)
#define         CSID_RDI_CFG0_VC_MASK                   GENMASK(23, 22)
#define         CSID_RDI_CFG0_DTID_MASK                 GENMASK(28, 27)
#define         CSID_RDI_CFG0_ENABLE                    BIT(31)

#define CSID_RDI_CTRL(rdi)                                      (0x308 + 0x100 * (rdi))
#define CSID_RDI_CTRL_HALT_AT_FRAME_BOUNDARY            0
#define CSID_RDI_CTRL_RESUME_AT_FRAME_BOUNDARY          1

static void __csid_configure_rx(struct csid_device *csid, struct csid_phy_config *phy)
{
        u32 val;

        val = FIELD_PREP(CSI2_RX_CFG0_NUM_ACTIVE_LANES_MASK, phy->lane_cnt - 1);
        val |= FIELD_PREP(CSI2_RX_CFG0_DLX_INPUT_SEL_MASK, phy->lane_assign);
        val |= FIELD_PREP(CSI2_RX_CFG0_PHY_NUM_SEL_MASK,
                          phy->csiphy_id + CSI2_RX_CFG0_PHY_NUM_SEL_BASE_IDX);
        writel_relaxed(val, csid->base + CSID_CSI2_RX_CFG0);

        val = CSI2_RX_CFG1_PACKET_ECC_CORRECTION_EN;
        writel_relaxed(val, csid->base + CSID_CSI2_RX_CFG1);
}

static void __csid_ctrl_rdi(struct csid_device *csid, int enable, u8 rdi)
{
        writel_relaxed(!!enable, csid->base + CSID_RDI_CTRL(rdi));
}

static void __csid_configure_rdi_stream(struct csid_device *csid, u8 enable, u8 vc)
{
        struct v4l2_mbus_framefmt *input_format = &csid->fmt[MSM_CSID_PAD_FIRST_SRC + vc];
        const struct csid_format_info *format = csid_get_fmt_entry(csid->res->formats->formats,
                                                                   csid->res->formats->nformats,
                                                                   input_format->code);
        u8 dt_id;
        u32 val;

        /*
         * DT_ID is a two bit bitfield that is concatenated with
         * the four least significant bits of the five bit VC
         * bitfield to generate an internal CID value.
         *
         * CSID_RDI_CFG0(vc)
         * DT_ID : 28:27
         * VC    : 26:22
         * DT    : 21:16
         *
         * CID   : VC 3:0 << 2 | DT_ID 1:0
         */
        dt_id = vc & 0x03;

        val = CSID_RDI_CFG0_DECODE_FORMAT_NOP; /* only for RDI path */
        val |= FIELD_PREP(CSID_RDI_CFG0_DT_MASK, format->data_type);
        val |= FIELD_PREP(CSID_RDI_CFG0_VC_MASK, vc);
        val |= FIELD_PREP(CSID_RDI_CFG0_DTID_MASK, dt_id);

        if (enable)
                val |= CSID_RDI_CFG0_ENABLE;

        dev_dbg(csid->camss->dev, "CSID%u: Stream %s (dt:0x%x vc=%u)\n",
                csid->id, enable ? "enable" : "disable", format->data_type, vc);

        writel_relaxed(val, csid->base + CSID_RDI_CFG0(vc));
}

static void csid_configure_stream(struct csid_device *csid, u8 enable)
{
        int i;

        __csid_configure_rx(csid, &csid->phy);

        for (i = 0; i < MSM_CSID_MAX_SRC_STREAMS; i++) {
                if (csid->phy.en_vc & BIT(i)) {
                        __csid_configure_rdi_stream(csid, enable, i);
                        __csid_ctrl_rdi(csid, enable, i);
                }
        }
}

static int csid_reset(struct csid_device *csid)
{
        unsigned long time;

        writel_relaxed(CSID_IRQ_MASK_RST_DONE, csid->base + CSID_IRQ_MASK);
        writel_relaxed(CSID_IRQ_MASK_RST_DONE, csid->base + CSID_IRQ_CLEAR);
        writel_relaxed(CSID_IRQ_CMD_CLEAR, csid->base + CSID_IRQ_CMD);

        reinit_completion(&csid->reset_complete);

        /* Reset with registers preserved */
        writel(CSID_RST_IRQ | CSID_RST_IFE_CLK | CSID_RST_PHY_CLK | CSID_RST_CSID_CLK,
               csid->base + CSID_RST_STROBES);

        time = wait_for_completion_timeout(&csid->reset_complete,
                                           msecs_to_jiffies(CSID_RESET_TIMEOUT_MS));
        if (!time) {
                dev_err(csid->camss->dev, "CSID%u: reset timeout\n", csid->id);
                return -EIO;
        }

        dev_dbg(csid->camss->dev, "CSID%u: reset done\n", csid->id);

        return 0;
}

static irqreturn_t csid_isr(int irq, void *dev)
{
        struct csid_device *csid = dev;
        u32 val;

        val = readl_relaxed(csid->base + CSID_IRQ_STATUS);
        writel_relaxed(val, csid->base + CSID_IRQ_CLEAR);
        writel_relaxed(CSID_IRQ_CMD_CLEAR, csid->base + CSID_IRQ_CMD);

        if (val & CSID_IRQ_MASK_RST_DONE)
                complete(&csid->reset_complete);
        else
                dev_warn_ratelimited(csid->camss->dev, "Spurious CSID interrupt\n");

        return IRQ_HANDLED;
}

static int csid_configure_testgen_pattern(struct csid_device *csid, s32 val)
{
        return -EOPNOTSUPP; /* Not part of CSID */
}

static void csid_subdev_init(struct csid_device *csid) {}

const struct csid_hw_ops csid_ops_340 = {
        .configure_testgen_pattern = csid_configure_testgen_pattern,
        .configure_stream = csid_configure_stream,
        .hw_version = csid_hw_version,
        .isr = csid_isr,
        .reset = csid_reset,
        .src_pad_code = csid_src_pad_code,
        .subdev_init = csid_subdev_init,
};