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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Microsemi MIPS SoC reset driver
*
* License: Dual MIT/GPL
* Copyright (c) 2017 Microsemi Corporation
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/notifier.h>
#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
struct reset_props {
const char *syscon;
u32 protect_reg;
u32 vcore_protect;
u32 if_si_owner_bit;
};
struct ocelot_reset_context {
void __iomem *base;
struct regmap *cpu_ctrl;
const struct reset_props *props;
struct notifier_block restart_handler;
};
#define BIT_OFF_INVALID 32
#define SOFT_CHIP_RST BIT(0)
#define ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24
#define IF_SI_OWNER_MASK GENMASK(1, 0)
#define IF_SI_OWNER_SISL 0
#define IF_SI_OWNER_SIBM 1
#define IF_SI_OWNER_SIMC 2
static int ocelot_restart_handle(struct notifier_block *this,
unsigned long mode, void *cmd)
{
struct ocelot_reset_context *ctx = container_of(this, struct
ocelot_reset_context,
restart_handler);
u32 if_si_owner_bit = ctx->props->if_si_owner_bit;
/* Make sure the core is not protected from reset */
regmap_update_bits(ctx->cpu_ctrl, ctx->props->protect_reg,
ctx->props->vcore_protect, 0);
/* Make the SI back to boot mode */
if (if_si_owner_bit != BIT_OFF_INVALID)
regmap_update_bits(ctx->cpu_ctrl,
ICPU_CFG_CPU_SYSTEM_CTRL_GENERAL_CTRL,
IF_SI_OWNER_MASK << if_si_owner_bit,
IF_SI_OWNER_SIBM << if_si_owner_bit);
pr_emerg("Resetting SoC\n");
writel(SOFT_CHIP_RST, ctx->base);
pr_emerg("Unable to restart system\n");
return NOTIFY_DONE;
}
static int ocelot_reset_probe(struct platform_device *pdev)
{
struct ocelot_reset_context *ctx;
struct resource *res;
struct device *dev = &pdev->dev;
int err;
ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ctx->base = devm_ioremap_resource(dev, res);
if (IS_ERR(ctx->base))
return PTR_ERR(ctx->base);
ctx->props = device_get_match_data(dev);
ctx->cpu_ctrl = syscon_regmap_lookup_by_compatible(ctx->props->syscon);
if (IS_ERR(ctx->cpu_ctrl)) {
dev_err(dev, "No syscon map: %s\n", ctx->props->syscon);
return PTR_ERR(ctx->cpu_ctrl);
}
ctx->restart_handler.notifier_call = ocelot_restart_handle;
ctx->restart_handler.priority = 192;
err = register_restart_handler(&ctx->restart_handler);
if (err)
dev_err(dev, "can't register restart notifier (err=%d)\n", err);
return err;
}
static const struct reset_props reset_props_jaguar2 = {
.syscon = "mscc,ocelot-cpu-syscon",
.protect_reg = 0x20,
.vcore_protect = BIT(2),
.if_si_owner_bit = 6,
};
static const struct reset_props reset_props_luton = {
.syscon = "mscc,ocelot-cpu-syscon",
.protect_reg = 0x20,
.vcore_protect = BIT(2),
.if_si_owner_bit = BIT_OFF_INVALID, /* n/a */
};
static const struct reset_props reset_props_ocelot = {
.syscon = "mscc,ocelot-cpu-syscon",
.protect_reg = 0x20,
.vcore_protect = BIT(2),
.if_si_owner_bit = 4,
};
static const struct reset_props reset_props_sparx5 = {
.syscon = "microchip,sparx5-cpu-syscon",
.protect_reg = 0x84,
.vcore_protect = BIT(10),
.if_si_owner_bit = 6,
};
static const struct of_device_id ocelot_reset_of_match[] = {
{
.compatible = "mscc,jaguar2-chip-reset",
.data = &reset_props_jaguar2
}, {
.compatible = "mscc,luton-chip-reset",
.data = &reset_props_luton
}, {
.compatible = "mscc,ocelot-chip-reset",
.data = &reset_props_ocelot
}, {
.compatible = "microchip,sparx5-chip-reset",
.data = &reset_props_sparx5
},
{ /*sentinel*/ }
};
static struct platform_driver ocelot_reset_driver = {
.probe = ocelot_reset_probe,
.driver = {
.name = "ocelot-chip-reset",
.of_match_table = ocelot_reset_of_match,
},
};
builtin_platform_driver(ocelot_reset_driver);
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