// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2021 MediaTek Inc.
 */

#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/io.h>
#include <linux/timer.h>

#ifdef MTK_QOS_FRAMEWORK
#include <mtk_qos_ipi.h>
#endif
#include <mt-plat/mtk_gpu_utility.h>
#include <mtk_gpufreq.h>

struct v1_data {
	unsigned int version;
	unsigned int ctx;
	unsigned int frame;
	unsigned int job;
	unsigned int freq;
};
struct v1_data *gpu_info_buf;

static void _mgq_proc_show_v1(struct seq_file *m)
{
	seq_printf(m, "ctx: \t%d\n", gpu_info_buf->ctx);
	seq_printf(m, "frame: \t%d\n", gpu_info_buf->frame);
	seq_printf(m, "job: \t%d\n", gpu_info_buf->job);
	seq_printf(m, "freq: \t%d\n", gpu_info_buf->freq);
}

static int _mgq_proc_show(struct seq_file *m, void *v)
{
	if (gpu_info_buf) {
		unsigned int version = readl(gpu_info_buf + 0);

		seq_printf(m, "version: %d\n", version);
		if (version == 1)
			_mgq_proc_show_v1(m);
		else
			seq_printf(m, "unknown version: 0x%x\n", version);
	} else {
		seq_puts(m, "gpu_info_buf == null\n");
	}
	return 0;
}

static int _mgq_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, _mgq_proc_show, NULL);
}
static const struct file_operations _mgq_proc_fops = {
	.owner = THIS_MODULE,
	.open = _mgq_proc_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int _MTKGPUQoS_initDebugFS(void)
{
	struct proc_dir_entry *dir = NULL;

	dir = proc_mkdir("mgq", NULL);
	if (!dir) {
		pr_debug("@%s: create /proc/mgq failed\n", __func__);
		return -ENOMEM;
	}

	if (!proc_create("job_status", 0644, dir, &_mgq_proc_fops))
		pr_debug("@%s: create /proc/mgq/job_status failed\n", __func__);

	return 0;
}

struct setupfw_t {
	phys_addr_t phyaddr;
	size_t size;
};

static struct setupfw_t setupfw_data;
static void setupfw_work_handler(struct work_struct *work);
static DECLARE_DELAYED_WORK(g_setupfw_work, setupfw_work_handler);

static void setupfw_work_handler(struct work_struct *work)
{
	struct qos_ipi_data qos_d;
	int ret;

	qos_d.cmd = QOS_IPI_SETUP_GPU_INFO;
	qos_d.u.gpu_info.addr = (unsigned int)setupfw_data.phyaddr;
	qos_d.u.gpu_info.addr_hi = (unsigned int)(setupfw_data.phyaddr >> 32);
	qos_d.u.gpu_info.size = (unsigned int)setupfw_data.size;
	ret = qos_ipi_to_sspm_command(&qos_d, 4);

	pr_debug("%s: addr:0x%x, addr_hi:0x%x, ret:%d\n",
		__func__,
		qos_d.u.gpu_info.addr,
		qos_d.u.gpu_info.addr_hi,
		ret);

	if (ret == 1) {
		pr_debug("%s: sspm_ipi success! (%d)\n", __func__, ret);
	} else {
		pr_debug("%s: sspm_ipi fail (%d)\n", __func__, ret);
		schedule_delayed_work(&g_setupfw_work, 5 * HZ);
	}
}



static void _MTKGPUQoS_setupFW(phys_addr_t phyaddr, size_t size)
{
	setupfw_data.phyaddr = phyaddr;
	setupfw_data.size = size;

	schedule_delayed_work(&g_setupfw_work, 1);
}

static void bw_v1_gpu_power_change_notify(int power_on)
{
	static int ctx;
	unsigned int loading, idx, min_idx;

	mtk_get_gpu_loading(&loading);
	idx = mt_gpufreq_get_cur_freq_index();
	min_idx = mt_gpufreq_get_dvfs_table_num()-1;

	if (!power_on) {
		ctx = gpu_info_buf->ctx;
		gpu_info_buf->ctx = 0; // ctx
	} else {
		gpu_info_buf->ctx = ctx;

		/*
		 * if gpu loading < 40% and gpu freq is lowest,
		 * don't do GPU QoS prediction.
		 */
		if ((idx == min_idx) && (loading < 40))
			gpu_info_buf->freq = 5566;
		else
			gpu_info_buf->freq = 0;
	}

}

void MTKGPUQoS_setup(struct v1_data *v1, phys_addr_t phyaddr, size_t size)
{
	gpu_info_buf = v1;

	_MTKGPUQoS_initDebugFS();
	_MTKGPUQoS_setupFW(phyaddr, size);

	mtk_register_gpu_power_change("qpu_qos", bw_v1_gpu_power_change_notify);
}
EXPORT_SYMBOL(MTKGPUQoS_setup);

uint32_t MTKGPUQoS_getBW(uint32_t offset)
{
	return 0;
}
EXPORT_SYMBOL(MTKGPUQoS_getBW);