xref: /device/soc/rockchip/common/vendor/drivers/devfreq/event/rockchip-nocp.c

/*
 * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
 *
 * 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.
 */

#include <linux/devfreq-event.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>

#define EVENT_BYTE 0x08
#define EVENT_CHAIN 0x10

#define START_EN BIT(3)
#define GLOBAL_EN BIT(0)
#define START_GO BIT(0)

#define PROBE_MAINCTL 0x0008
#define PROBE_CFGCTL 0x000c
#define PROBE_STATPERIOD 0x0024
#define PROBE_STATGO 0x0028
#define PROBE_COUNTERS_0_SRC 0x0138
#define PROBE_COUNTERS_0_VAL 0x013c
#define PROBE_COUNTERS_1_SRC 0x014c
#define PROBE_COUNTERS_1_VAL 0x0150

struct rockchip_nocp {
    void __iomem *reg_base;
    struct device *dev;
    struct devfreq_event_dev *edev;
    struct devfreq_event_desc *desc;
    ktime_t time;
};

static int rockchip_nocp_enable(struct devfreq_event_dev *edev)
{
    struct rockchip_nocp *nocp = devfreq_event_get_drvdata(edev);
    void __iomem *reg_base = nocp->reg_base;

    writel_relaxed(GLOBAL_EN, reg_base + PROBE_CFGCTL);
    writel_relaxed(START_EN, reg_base + PROBE_MAINCTL);
    writel_relaxed(0, reg_base + PROBE_STATPERIOD);
    writel_relaxed(EVENT_BYTE, reg_base + PROBE_COUNTERS_0_SRC);
    writel_relaxed(EVENT_CHAIN, reg_base + PROBE_COUNTERS_1_SRC);
    writel_relaxed(START_GO, reg_base + PROBE_STATGO);

    nocp->time = ktime_get();

    return 0;
}

static int rockchip_nocp_disable(struct devfreq_event_dev *edev)
{
    struct rockchip_nocp *nocp = devfreq_event_get_drvdata(edev);
    void __iomem *reg_base = nocp->reg_base;

    writel_relaxed(0, reg_base + PROBE_STATGO);
    writel_relaxed(0, reg_base + PROBE_MAINCTL);
    writel_relaxed(0, reg_base + PROBE_CFGCTL);
    writel_relaxed(0, reg_base + PROBE_COUNTERS_0_SRC);
    writel_relaxed(0, reg_base + PROBE_COUNTERS_1_SRC);

    return 0;
}

static int rockchip_nocp_get_event(struct devfreq_event_dev *edev, struct devfreq_event_data *edata)
{
    struct rockchip_nocp *nocp = devfreq_event_get_drvdata(edev);
    void __iomem *reg_base = nocp->reg_base;
    u32 counter = 0, counter0 = 0, counter1 = 0;
    int time_ms = 0;

    time_ms = ktime_to_ms(ktime_sub(ktime_get(), nocp->time));

    counter0 = readl_relaxed(reg_base + PROBE_COUNTERS_0_VAL);
    counter1 = readl_relaxed(reg_base + PROBE_COUNTERS_1_VAL);
    counter = (counter0 & 0xffff) | ((counter1 & 0xffff) << 0x10);
    counter = counter / 0xf4240;
    if (time_ms > 0) {
        edata->load_count = (counter * 0x3e8) / time_ms;
    }

    writel_relaxed(START_GO, reg_base + PROBE_STATGO);
    nocp->time = ktime_get();

    return 0;
}

static int rockchip_nocp_set_event(struct devfreq_event_dev *edev)
{
    return 0;
}

static const struct devfreq_event_ops rockchip_nocp_ops = {
    .disable = rockchip_nocp_disable,
    .enable = rockchip_nocp_enable,
    .get_event = rockchip_nocp_get_event,
    .set_event = rockchip_nocp_set_event,
};

static const struct of_device_id rockchip_nocp_id_match[] = {
    {.compatible = "rockchip,rk3288-nocp"},
    {.compatible = "rockchip,rk3368-nocp"},
    {.compatible = "rockchip,rk3399-nocp"},
    {},
};

static int rockchip_nocp_probe(struct platform_device *pdev)
{
    struct resource *res;
    struct rockchip_nocp *nocp;
    struct devfreq_event_desc *desc;
    struct device_node *np = pdev->dev.of_node;

    nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL);
    if (!nocp) {
        return -ENOMEM;
    }

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    nocp->reg_base = devm_ioremap_resource(&pdev->dev, res);
    if (IS_ERR(nocp->reg_base)) {
        return PTR_ERR(nocp->reg_base);
    }

    desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
    if (!desc) {
        return -ENOMEM;
    }

    desc->ops = &rockchip_nocp_ops;
    desc->driver_data = nocp;
    desc->name = np->name;
    nocp->desc = desc;
    nocp->dev = &pdev->dev;
    nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, desc);
    if (IS_ERR(nocp->edev)) {
        dev_err(&pdev->dev, "failed to add devfreq-event device\n");
        return PTR_ERR(nocp->edev);
    }

    platform_set_drvdata(pdev, nocp);

    return 0;
}

static struct platform_driver rockchip_nocp_driver = {
    .probe = rockchip_nocp_probe,
    .driver =
        {
            .name = "rockchip-nocp",
            .of_match_table = rockchip_nocp_id_match,
        },
};
module_platform_driver(rockchip_nocp_driver);

MODULE_DESCRIPTION("Rockchip NoC (Network on Chip) Probe driver");
MODULE_AUTHOR("Finley Xiao <finley.xiao@rock-chips.com>");
MODULE_LICENSE("GPL v2");