drivers/amlogic/ddr_tool/dmc_tm2.c

/*
 * drivers/amlogic/ddr_tool/dmc_tm2.c
 *
 * Copyright (C) 2017 Amlogic, Inc. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that 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/cdev.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/irqreturn.h>
#include <linux/module.h>
#include <linux/mm.h>

#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/kallsyms.h>
#include <linux/of_irq.h>
#include <linux/interrupt.h>
#include <linux/amlogic/cpu_version.h>
#include <linux/amlogic/page_trace.h>
#include <linux/amlogic/dmc_monitor.h>
#include <linux/amlogic/ddr_port.h>

#define DMC_PROT0_RANGE		((0x0030  << 2))
#define DMC_PROT0_CTRL		((0x0031  << 2))
#define DMC_PROT0_CTRL1		((0x0032  << 2))

#define DMC_PROT1_RANGE		((0x0033  << 2))
#define DMC_PROT1_CTRL		((0x0034  << 2))
#define DMC_PROT1_CTRL1		((0x0035  << 2))

#define DMC_PROT_VIO_0		((0x0036  << 2))
#define DMC_PROT_VIO_1		((0x0037  << 2))

#define DMC_PROT_VIO_2		((0x0038  << 2))
#define DMC_PROT_VIO_3		((0x0039  << 2))

#define DMC_PROT_IRQ_CTRL	((0x003a  << 2))
#define DMC_IRQ_STS		((0x003b  << 2))

static size_t tm2_dmc_dump_reg(char *buf)
{
	size_t sz = 0, i;
	unsigned long val;

	for (i = 0; i < 2; i++) {
		val = dmc_prot_rw(DMC_PROT0_RANGE + (i * 12), 0, DMC_READ);
		sz += sprintf(buf + sz, "DMC_PROT%zu_RANGE:%lx\n", i, val);
		val = dmc_prot_rw(DMC_PROT0_CTRL + (i * 12), 0, DMC_READ);
		sz += sprintf(buf + sz, "DMC_PROT%zu_CTRL:%lx\n", i, val);
		val = dmc_prot_rw(DMC_PROT0_CTRL1 + (i * 12), 0, DMC_READ);
		sz += sprintf(buf + sz, "DMC_PROT%zu_CTRL1:%lx\n", i, val);
	}
	for (i = 0; i < 4; i++) {
		val = dmc_prot_rw(DMC_PROT_VIO_0 + (i << 2), 0, DMC_READ);
		sz += sprintf(buf + sz, "DMC_PROT_VIO_%zu:%lx\n", i, val);
	}
	val = dmc_prot_rw(DMC_PROT_IRQ_CTRL, 0, DMC_READ);
	sz += sprintf(buf + sz, "DMC_PROT_IRQ_CTRL:%lx\n", val);
	val = dmc_prot_rw(DMC_IRQ_STS, 0, DMC_READ);
	sz += sprintf(buf + sz, "DMC_IRQ_STS:%lx\n", val);

	return sz;
}

static void check_violation(struct dmc_monitor *mon, void *data)
{
	int i, port, subport;
	unsigned long addr, status;
	char id_str[4];
	struct page *page;
	struct page_trace *trace;

	for (i = 1; i < 4; i += 2) {
		status = dmc_prot_rw(DMC_PROT_VIO_0 + (i << 2), 0, DMC_READ);
		if (!(status & (1 << 19)))
			continue;
		addr = dmc_prot_rw(DMC_PROT_VIO_0 + ((i - 1) << 2), 0,
				   DMC_READ);
		if (addr > mon->addr_end)
			continue;

		/* ignore violation on same page/same port */
		if ((addr & PAGE_MASK) == mon->last_addr &&
		    status == mon->last_status) {
			mon->same_page++;
			continue;
		}
		/* ignore cma driver pages */
		page = phys_to_page(addr);
		trace = find_page_base(page);
		if (trace && trace->migrate_type == MIGRATE_CMA)
			continue;

		port = (status >> 11) & 0x1f;
		subport = (status >> 6) & 0xf;

		/* ignore sd_emmc in device */
		if (port == 7 && (subport == 11 || subport == 4))
			continue;

		pr_emerg(DMC_TAG", addr:%08lx, s:%08lx, ID:%s, sub:%s, c:%ld, d:%p\n",
			addr, status, to_ports(port),
			to_sub_ports(port, subport, id_str),
			mon->same_page, data);
		show_violation_mem(addr);
		if (!port) /* dump stack for CPU write */
			dump_stack();

		mon->same_page   = 0;
		mon->last_addr   = addr & PAGE_MASK;
		mon->last_status = status;
	}
}

static void tm2_dmc_mon_irq(struct dmc_monitor *mon, void *data)
{
	unsigned long value;

	value = dmc_prot_rw(DMC_IRQ_STS, 0, DMC_READ);
	if (in_interrupt()) {
		if (value & DMC_WRITE_VIOLATION)
			check_violation(mon, data);

		/* check irq flags just after IRQ handler */
		mod_delayed_work(system_wq, &mon->work, 0);
	}
	/* clear irq */
	value &= 0x03;		/* irq flags */
	value |= 0x04;		/* en */
	dmc_prot_rw(DMC_PROT_IRQ_CTRL, value, DMC_WRITE);
}

static int tm2_dmc_mon_set(struct dmc_monitor *mon)
{
	unsigned long value, end;

	/* aligned to 64KB */
	end = ALIGN(mon->addr_end, DMC_ADDR_SIZE);
	value = (mon->addr_start >> 16) | ((end >> 16) << 16);
	dmc_prot_rw(DMC_PROT0_RANGE, value, DMC_WRITE);

	dmc_prot_rw(DMC_PROT0_CTRL, mon->device | 1 << 24, DMC_WRITE);
	dmc_prot_rw(DMC_PROT0_CTRL1, 1 << 24, DMC_WRITE);
	dmc_prot_rw(DMC_PROT_IRQ_CTRL, 0x06, DMC_WRITE);

	pr_emerg("range:%08lx - %08lx, device:%x\n",
		mon->addr_start, mon->addr_end, mon->device);
	return 0;
}

void tm2_dmc_mon_disable(struct dmc_monitor *mon)
{
	dmc_prot_rw(DMC_PROT0_RANGE, 0, DMC_WRITE);
	dmc_prot_rw(DMC_PROT0_CTRL, 0, DMC_WRITE);
	dmc_prot_rw(DMC_PROT0_CTRL1, 0, DMC_WRITE);
	dmc_prot_rw(DMC_PROT_IRQ_CTRL, 0, DMC_WRITE);
	mon->device     = 0;
	mon->addr_start = 0;
	mon->addr_end   = 0;
}

struct dmc_mon_ops tm2_dmc_mon_ops = {
	.handle_irq = tm2_dmc_mon_irq,
	.set_montor = tm2_dmc_mon_set,
	.disable    = tm2_dmc_mon_disable,
	.dump_reg   = tm2_dmc_dump_reg,
};