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Release 4.11 drivers/power/reset/axxia-reset.c

/*
 * Reset driver for Axxia devices
 *
 * Copyright (C) 2014 LSI
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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/init.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>


#define SC_CRIT_WRITE_KEY	0x1000

#define SC_LATCH_ON_RESET	0x1004

#define SC_RESET_CONTROL	0x1008

#define   RSTCTL_RST_ZERO	(1<<3)

#define   RSTCTL_RST_FAB	(1<<2)

#define   RSTCTL_RST_CHIP	(1<<1)

#define   RSTCTL_RST_SYS	(1<<0)

#define SC_EFUSE_INT_STATUS	0x180c

#define   EFUSE_READ_DONE	(1<<31)


static struct regmap *syscon;


static int axxia_restart_handler(struct notifier_block *this, unsigned long mode, void *cmd) { /* Access Key (0xab) */ regmap_write(syscon, SC_CRIT_WRITE_KEY, 0xab); /* Select internal boot from 0xffff0000 */ regmap_write(syscon, SC_LATCH_ON_RESET, 0x00000040); /* Assert ResetReadDone (to avoid hanging in boot ROM) */ regmap_write(syscon, SC_EFUSE_INT_STATUS, EFUSE_READ_DONE); /* Assert chip reset */ regmap_update_bits(syscon, SC_RESET_CONTROL, RSTCTL_RST_CHIP, RSTCTL_RST_CHIP); return NOTIFY_DONE; }

Contributors

PersonTokensPropCommitsCommitProp
Anders Berg5078.12%150.00%
Guenter Roeck1421.88%150.00%
Total64100.00%2100.00%

static struct notifier_block axxia_restart_nb = { .notifier_call = axxia_restart_handler, .priority = 128, };
static int axxia_reset_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; int err; syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon"); if (IS_ERR(syscon)) { pr_err("%s: syscon lookup failed\n", dev->of_node->name); return PTR_ERR(syscon); } err = register_restart_handler(&axxia_restart_nb); if (err) dev_err(dev, "cannot register restart handler (err=%d)\n", err); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Anders Berg6272.94%150.00%
Guenter Roeck2327.06%150.00%
Total85100.00%2100.00%

static const struct of_device_id of_axxia_reset_match[] = { { .compatible = "lsi,axm55xx-reset", }, {}, }; MODULE_DEVICE_TABLE(of, of_axxia_reset_match); static struct platform_driver axxia_reset_driver = { .probe = axxia_reset_probe, .driver = { .name = "axxia-reset", .of_match_table = of_match_ptr(of_axxia_reset_match), }, };
static int __init axxia_reset_init(void) { return platform_driver_register(&axxia_reset_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Anders Berg16100.00%1100.00%
Total16100.00%1100.00%

device_initcall(axxia_reset_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Anders Berg25981.45%150.00%
Guenter Roeck5918.55%150.00%
Total318100.00%2100.00%
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