drivers/soc/qcom/boot_stats.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/of.h>
#include <linux/of_address.h>

struct boot_stats {
	uint32_t bootloader_start;
	uint32_t bootloader_end;
	uint32_t bootloader_display;
	uint32_t bootloader_load_kernel;
};

static void __iomem *mpm_counter_base;
static uint32_t mpm_counter_freq;
static struct boot_stats __iomem *boot_stats;

static int mpm_parse_dt(void)
{
	struct device_node *np_imem, *np_mpm2;

	np_imem = of_find_compatible_node(NULL, NULL,
				"qcom,msm-imem-boot_stats");
	if (!np_imem) {
		pr_err("can't find qcom,msm-imem node\n");
		return -ENODEV;
	}
	boot_stats = of_iomap(np_imem, 0);
	if (!boot_stats) {
		pr_err("boot_stats: Can't map imem\n");
		goto err1;
	}

	np_mpm2 = of_find_compatible_node(NULL, NULL,
				"qcom,mpm2-sleep-counter");
	if (!np_mpm2) {
		pr_err("mpm_counter: can't find DT node\n");
		goto err1;
	}

	if (of_property_read_u32(np_mpm2, "clock-frequency", &mpm_counter_freq))
		goto err2;

	if (of_get_address(np_mpm2, 0, NULL, NULL)) {
		mpm_counter_base = of_iomap(np_mpm2, 0);
		if (!mpm_counter_base) {
			pr_err("mpm_counter: cant map counter base\n");
			goto err2;
		}
	} else
		goto err2;

	return 0;

err2:
	of_node_put(np_mpm2);
err1:
	of_node_put(np_imem);
	return -ENODEV;
}

static void print_boot_stats(void)
{
	pr_info("KPI: Bootloader start count = %u\n",
		readl_relaxed(&boot_stats->bootloader_start));
	pr_info("KPI: Bootloader end count = %u\n",
		readl_relaxed(&boot_stats->bootloader_end));
	pr_info("KPI: Bootloader display count = %u\n",
		readl_relaxed(&boot_stats->bootloader_display));
	pr_info("KPI: Bootloader load kernel count = %u\n",
		readl_relaxed(&boot_stats->bootloader_load_kernel));
	pr_info("KPI: Kernel MPM timestamp = %u\n",
		readl_relaxed(mpm_counter_base));
	pr_info("KPI: Kernel MPM Clock frequency = %u\n",
		mpm_counter_freq);
}

int boot_stats_init(void)
{
	int ret;

	ret = mpm_parse_dt();
	if (ret < 0)
		return -ENODEV;

	print_boot_stats();

	iounmap(boot_stats);
	iounmap(mpm_counter_base);

	return 0;
}