mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
783cb948d7
This driver supports reset on both BCM21664 and BCM23550. Code is being moved from arch/arm/mach-bcm/board_bcm21664.c Signed-off-by: Chris Brand <chris.brand@broadcom.com> Acked-By: Sebastian Reichel <sre@kernel.org> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
73 lines
2 KiB
C
73 lines
2 KiB
C
/*
|
|
* Copyright (C) 2016 Broadcom
|
|
*
|
|
* 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 version 2.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/reboot.h>
|
|
|
|
#define RSTMGR_REG_WR_ACCESS_OFFSET 0
|
|
#define RSTMGR_REG_CHIP_SOFT_RST_OFFSET 4
|
|
|
|
#define RSTMGR_WR_PASSWORD 0xa5a5
|
|
#define RSTMGR_WR_PASSWORD_SHIFT 8
|
|
#define RSTMGR_WR_ACCESS_ENABLE 1
|
|
|
|
static void __iomem *kona_reset_base;
|
|
|
|
static int kona_reset_handler(struct notifier_block *this,
|
|
unsigned long mode, void *cmd)
|
|
{
|
|
/*
|
|
* A soft reset is triggered by writing a 0 to bit 0 of the soft reset
|
|
* register. To write to that register we must first write the password
|
|
* and the enable bit in the write access enable register.
|
|
*/
|
|
writel((RSTMGR_WR_PASSWORD << RSTMGR_WR_PASSWORD_SHIFT) |
|
|
RSTMGR_WR_ACCESS_ENABLE,
|
|
kona_reset_base + RSTMGR_REG_WR_ACCESS_OFFSET);
|
|
writel(0, kona_reset_base + RSTMGR_REG_CHIP_SOFT_RST_OFFSET);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block kona_reset_nb = {
|
|
.notifier_call = kona_reset_handler,
|
|
.priority = 128,
|
|
};
|
|
|
|
static int kona_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
kona_reset_base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(kona_reset_base))
|
|
return PTR_ERR(kona_reset_base);
|
|
|
|
return register_restart_handler(&kona_reset_nb);
|
|
}
|
|
|
|
static const struct of_device_id of_match[] = {
|
|
{ .compatible = "brcm,bcm21664-resetmgr" },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver bcm_kona_reset_driver = {
|
|
.probe = kona_reset_probe,
|
|
.driver = {
|
|
.name = "brcm-kona-reset",
|
|
.of_match_table = of_match,
|
|
},
|
|
};
|
|
|
|
builtin_platform_driver(bcm_kona_reset_driver);
|