// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Rockchip ISP1 Driver - Base driver
 *
 * Copyright (C) 2019 Collabora, Ltd.
 *
 * Based on Rockchip ISP1 driver by Rockchip Electronics Co., Ltd.
 * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
 */

#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/minmax.h>
#include <linux/pm_runtime.h>
#include <linux/seq_file.h>
#include <linux/string.h>

#include "rkisp1-common.h"
#include "rkisp1-regs.h"

struct rkisp1_debug_register {
        u32 reg;
        u32 shd;
        const char * const name;
};

#define RKISP1_DEBUG_REG(name)          { RKISP1_CIF_##name, 0, #name }
#define RKISP1_DEBUG_SHD_REG(name) { \
        RKISP1_CIF_##name, RKISP1_CIF_##name##_SHD, #name \
}

/* Keep this up-to-date when adding new registers. */
#define RKISP1_MAX_REG_LENGTH           21

static int rkisp1_debug_dump_regs(struct rkisp1_device *rkisp1,
                                  struct seq_file *m, unsigned int offset,
                                  const struct rkisp1_debug_register *regs)
{
        const int width = RKISP1_MAX_REG_LENGTH;
        u32 val, shd;
        int ret;

        ret = pm_runtime_get_if_in_use(rkisp1->dev);
        if (ret <= 0)
                return ret ? : -ENODATA;

        for (; regs->name; ++regs) {
                val = rkisp1_read(rkisp1, offset + regs->reg);

                if (regs->shd) {
                        shd = rkisp1_read(rkisp1, offset + regs->shd);
                        seq_printf(m, "%*s: 0x%08x/0x%08x\n", width, regs->name,
                                   val, shd);
                } else {
                        seq_printf(m, "%*s: 0x%08x\n", width, regs->name, val);
                }
        }

        pm_runtime_put(rkisp1->dev);

        return 0;
}

static int rkisp1_debug_dump_core_regs_show(struct seq_file *m, void *p)
{
        static const struct rkisp1_debug_register registers[] = {
                RKISP1_DEBUG_REG(VI_CCL),
                RKISP1_DEBUG_REG(VI_ICCL),
                RKISP1_DEBUG_REG(VI_IRCL),
                RKISP1_DEBUG_REG(VI_DPCL),
                RKISP1_DEBUG_REG(MI_CTRL),
                RKISP1_DEBUG_REG(MI_BYTE_CNT),
                RKISP1_DEBUG_REG(MI_CTRL_SHD),
                RKISP1_DEBUG_REG(MI_RIS),
                RKISP1_DEBUG_REG(MI_STATUS),
                RKISP1_DEBUG_REG(MI_DMA_CTRL),
                RKISP1_DEBUG_REG(MI_DMA_STATUS),
                { /* Sentinel */ },
        };
        struct rkisp1_device *rkisp1 = m->private;

        return rkisp1_debug_dump_regs(rkisp1, m, 0, registers);
}
DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_dump_core_regs);

static int rkisp1_debug_dump_isp_regs_show(struct seq_file *m, void *p)
{
        static const struct rkisp1_debug_register registers[] = {
                RKISP1_DEBUG_REG(ISP_CTRL),
                RKISP1_DEBUG_REG(ISP_ACQ_PROP),
                RKISP1_DEBUG_REG(ISP_FLAGS_SHD),
                RKISP1_DEBUG_REG(ISP_RIS),
                RKISP1_DEBUG_REG(ISP_ERR),
                RKISP1_DEBUG_SHD_REG(ISP_IS_H_OFFS),
                RKISP1_DEBUG_SHD_REG(ISP_IS_V_OFFS),
                RKISP1_DEBUG_SHD_REG(ISP_IS_H_SIZE),
                RKISP1_DEBUG_SHD_REG(ISP_IS_V_SIZE),
                { /* Sentinel */ },
        };
        struct rkisp1_device *rkisp1 = m->private;

        return rkisp1_debug_dump_regs(rkisp1, m, 0, registers);
}
DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_dump_isp_regs);

static int rkisp1_debug_dump_rsz_regs_show(struct seq_file *m, void *p)
{
        static const struct rkisp1_debug_register registers[] = {
                RKISP1_DEBUG_SHD_REG(RSZ_CTRL),
                RKISP1_DEBUG_SHD_REG(RSZ_SCALE_HY),
                RKISP1_DEBUG_SHD_REG(RSZ_SCALE_HCB),
                RKISP1_DEBUG_SHD_REG(RSZ_SCALE_HCR),
                RKISP1_DEBUG_SHD_REG(RSZ_SCALE_VY),
                RKISP1_DEBUG_SHD_REG(RSZ_SCALE_VC),
                RKISP1_DEBUG_SHD_REG(RSZ_PHASE_HY),
                RKISP1_DEBUG_SHD_REG(RSZ_PHASE_HC),
                RKISP1_DEBUG_SHD_REG(RSZ_PHASE_VY),
                RKISP1_DEBUG_SHD_REG(RSZ_PHASE_VC),
                { /* Sentinel */ },
        };
        struct rkisp1_resizer *rsz = m->private;

        return rkisp1_debug_dump_regs(rsz->rkisp1, m, rsz->regs_base, registers);
}
DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_dump_rsz_regs);

static int rkisp1_debug_dump_mi_mp_show(struct seq_file *m, void *p)
{
        static const struct rkisp1_debug_register registers[] = {
                RKISP1_DEBUG_REG(MI_MP_Y_BASE_AD_INIT),
                RKISP1_DEBUG_REG(MI_MP_Y_BASE_AD_INIT2),
                RKISP1_DEBUG_REG(MI_MP_Y_BASE_AD_SHD),
                RKISP1_DEBUG_REG(MI_MP_Y_SIZE_INIT),
                RKISP1_DEBUG_REG(MI_MP_Y_SIZE_INIT),
                RKISP1_DEBUG_REG(MI_MP_Y_SIZE_SHD),
                RKISP1_DEBUG_REG(MI_MP_Y_OFFS_CNT_SHD),
                { /* Sentinel */ },
        };
        struct rkisp1_device *rkisp1 = m->private;

        return rkisp1_debug_dump_regs(rkisp1, m, 0, registers);
}
DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_dump_mi_mp);

#define RKISP1_DEBUG_DATA_COUNT_BINS    32
#define RKISP1_DEBUG_DATA_COUNT_STEP    (4096 / RKISP1_DEBUG_DATA_COUNT_BINS)

static int rkisp1_debug_input_status_show(struct seq_file *m, void *p)
{
        struct rkisp1_device *rkisp1 = m->private;
        u16 data_count[RKISP1_DEBUG_DATA_COUNT_BINS] = { };
        unsigned int hsync_count = 0;
        unsigned int vsync_count = 0;
        unsigned int i;
        u32 data;
        u32 val;
        int ret;

        ret = pm_runtime_get_if_in_use(rkisp1->dev);
        if (ret <= 0)
                return ret ? : -ENODATA;

        /* Sample the ISP input port status 10000 times with a 1µs interval. */
        for (i = 0; i < 10000; ++i) {
                val = rkisp1_read(rkisp1, RKISP1_CIF_ISP_FLAGS_SHD);

                data = (val & RKISP1_CIF_ISP_FLAGS_SHD_S_DATA_MASK)
                     >> RKISP1_CIF_ISP_FLAGS_SHD_S_DATA_SHIFT;
                data_count[data / RKISP1_DEBUG_DATA_COUNT_STEP]++;

                if (val & RKISP1_CIF_ISP_FLAGS_SHD_S_HSYNC)
                        hsync_count++;
                if (val & RKISP1_CIF_ISP_FLAGS_SHD_S_VSYNC)
                        vsync_count++;

                udelay(1);
        }

        pm_runtime_put(rkisp1->dev);

        seq_printf(m, "vsync: %u, hsync: %u\n", vsync_count, hsync_count);
        seq_puts(m, "data:\n");
        for (i = 0; i < ARRAY_SIZE(data_count); ++i)
                seq_printf(m, "- [%04u:%04u]: %u\n",
                           i * RKISP1_DEBUG_DATA_COUNT_STEP,
                           (i + 1) * RKISP1_DEBUG_DATA_COUNT_STEP - 1,
                           data_count[i]);

        return 0;
}
DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_input_status);

void rkisp1_debug_init(struct rkisp1_device *rkisp1)
{
        struct rkisp1_debug *debug = &rkisp1->debug;
        struct dentry *regs_dir;

        debug->debugfs_dir = debugfs_create_dir(dev_name(rkisp1->dev), NULL);

        debugfs_create_ulong("data_loss", 0444, debug->debugfs_dir,
                             &debug->data_loss);
        debugfs_create_ulong("outform_size_err", 0444,  debug->debugfs_dir,
                             &debug->outform_size_error);
        debugfs_create_ulong("img_stabilization_size_error", 0444,
                             debug->debugfs_dir,
                             &debug->img_stabilization_size_error);
        debugfs_create_ulong("inform_size_error", 0444,  debug->debugfs_dir,
                             &debug->inform_size_error);
        debugfs_create_ulong("irq_delay", 0444,  debug->debugfs_dir,
                             &debug->irq_delay);
        debugfs_create_ulong("mipi_error", 0444, debug->debugfs_dir,
                             &debug->mipi_error);
        debugfs_create_ulong("stats_error", 0444, debug->debugfs_dir,
                             &debug->stats_error);
        debugfs_create_ulong("mp_stop_timeout", 0444, debug->debugfs_dir,
                             &debug->stop_timeout[RKISP1_MAINPATH]);
        debugfs_create_ulong("sp_stop_timeout", 0444, debug->debugfs_dir,
                             &debug->stop_timeout[RKISP1_SELFPATH]);
        debugfs_create_ulong("mp_frame_drop", 0444, debug->debugfs_dir,
                             &debug->frame_drop[RKISP1_MAINPATH]);
        debugfs_create_ulong("sp_frame_drop", 0444, debug->debugfs_dir,
                             &debug->frame_drop[RKISP1_SELFPATH]);
        debugfs_create_ulong("complete_frames", 0444, debug->debugfs_dir,
                             &debug->complete_frames);
        debugfs_create_file("input_status", 0444, debug->debugfs_dir, rkisp1,
                            &rkisp1_debug_input_status_fops);

        regs_dir = debugfs_create_dir("regs", debug->debugfs_dir);

        debugfs_create_file("core", 0444, regs_dir, rkisp1,
                            &rkisp1_debug_dump_core_regs_fops);
        debugfs_create_file("isp", 0444, regs_dir, rkisp1,
                            &rkisp1_debug_dump_isp_regs_fops);
        debugfs_create_file("mrsz", 0444, regs_dir,
                            &rkisp1->resizer_devs[RKISP1_MAINPATH],
                            &rkisp1_debug_dump_rsz_regs_fops);
        debugfs_create_file("srsz", 0444, regs_dir,
                            &rkisp1->resizer_devs[RKISP1_SELFPATH],
                            &rkisp1_debug_dump_rsz_regs_fops);

        debugfs_create_file("mi_mp", 0444, regs_dir, rkisp1,
                            &rkisp1_debug_dump_mi_mp_fops);
}

void rkisp1_debug_cleanup(struct rkisp1_device *rkisp1)
{
        debugfs_remove_recursive(rkisp1->debug.debugfs_dir);
}