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reset: Add Nuvoton ma35d1 reset driver support
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This driver supports individual IP reset for the MA35D1. The reset
control registers are a subset of the system control registers.

Signed-off-by: Jacky Huang <ychuang3@nuvoton.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Jacky Huang authored and Arnd Bergmann committed Jun 5, 2023
1 parent 691521a commit e4bb55d
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6 changes: 6 additions & 0 deletions drivers/reset/Kconfig
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Expand Up @@ -143,6 +143,12 @@ config RESET_NPCM
This enables the reset controller driver for Nuvoton NPCM
BMC SoCs.

config RESET_NUVOTON_MA35D1
bool "Nuvton MA35D1 Reset Driver"
default ARCH_MA35 || COMPILE_TEST
help
This enables the reset controller driver for Nuvoton MA35D1 SoC.

config RESET_OXNAS
bool

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1 change: 1 addition & 0 deletions drivers/reset/Makefile
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Expand Up @@ -21,6 +21,7 @@ obj-$(CONFIG_RESET_MCHP_SPARX5) += reset-microchip-sparx5.o
obj-$(CONFIG_RESET_MESON) += reset-meson.o
obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
obj-$(CONFIG_RESET_NPCM) += reset-npcm.o
obj-$(CONFIG_RESET_NUVOTON_MA35D1) += reset-ma35d1.o
obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
obj-$(CONFIG_RESET_POLARFIRE_SOC) += reset-mpfs.o
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235 changes: 235 additions & 0 deletions drivers/reset/reset-ma35d1.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2023 Nuvoton Technology Corp.
* Author: Chi-Fang Li <cfli0@nuvoton.com>
*/

#include <linux/bits.h>
#include <linux/container_of.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/reset-controller.h>
#include <linux/spinlock.h>
#include <dt-bindings/reset/nuvoton,ma35d1-reset.h>

struct ma35d1_reset_data {
struct reset_controller_dev rcdev;
struct notifier_block restart_handler;
void __iomem *base;
/* protect registers against concurrent read-modify-write */
spinlock_t lock;
};

static const struct {
u32 reg_ofs;
u32 bit;
} ma35d1_reset_map[] = {
[MA35D1_RESET_CHIP] = {0x20, 0},
[MA35D1_RESET_CA35CR0] = {0x20, 1},
[MA35D1_RESET_CA35CR1] = {0x20, 2},
[MA35D1_RESET_CM4] = {0x20, 3},
[MA35D1_RESET_PDMA0] = {0x20, 4},
[MA35D1_RESET_PDMA1] = {0x20, 5},
[MA35D1_RESET_PDMA2] = {0x20, 6},
[MA35D1_RESET_PDMA3] = {0x20, 7},
[MA35D1_RESET_DISP] = {0x20, 9},
[MA35D1_RESET_VCAP0] = {0x20, 10},
[MA35D1_RESET_VCAP1] = {0x20, 11},
[MA35D1_RESET_GFX] = {0x20, 12},
[MA35D1_RESET_VDEC] = {0x20, 13},
[MA35D1_RESET_WHC0] = {0x20, 14},
[MA35D1_RESET_WHC1] = {0x20, 15},
[MA35D1_RESET_GMAC0] = {0x20, 16},
[MA35D1_RESET_GMAC1] = {0x20, 17},
[MA35D1_RESET_HWSEM] = {0x20, 18},
[MA35D1_RESET_EBI] = {0x20, 19},
[MA35D1_RESET_HSUSBH0] = {0x20, 20},
[MA35D1_RESET_HSUSBH1] = {0x20, 21},
[MA35D1_RESET_HSUSBD] = {0x20, 22},
[MA35D1_RESET_USBHL] = {0x20, 23},
[MA35D1_RESET_SDH0] = {0x20, 24},
[MA35D1_RESET_SDH1] = {0x20, 25},
[MA35D1_RESET_NAND] = {0x20, 26},
[MA35D1_RESET_GPIO] = {0x20, 27},
[MA35D1_RESET_MCTLP] = {0x20, 28},
[MA35D1_RESET_MCTLC] = {0x20, 29},
[MA35D1_RESET_DDRPUB] = {0x20, 30},
[MA35D1_RESET_TMR0] = {0x24, 2},
[MA35D1_RESET_TMR1] = {0x24, 3},
[MA35D1_RESET_TMR2] = {0x24, 4},
[MA35D1_RESET_TMR3] = {0x24, 5},
[MA35D1_RESET_I2C0] = {0x24, 8},
[MA35D1_RESET_I2C1] = {0x24, 9},
[MA35D1_RESET_I2C2] = {0x24, 10},
[MA35D1_RESET_I2C3] = {0x24, 11},
[MA35D1_RESET_QSPI0] = {0x24, 12},
[MA35D1_RESET_SPI0] = {0x24, 13},
[MA35D1_RESET_SPI1] = {0x24, 14},
[MA35D1_RESET_SPI2] = {0x24, 15},
[MA35D1_RESET_UART0] = {0x24, 16},
[MA35D1_RESET_UART1] = {0x24, 17},
[MA35D1_RESET_UART2] = {0x24, 18},
[MA35D1_RESET_UART3] = {0x24, 19},
[MA35D1_RESET_UART4] = {0x24, 20},
[MA35D1_RESET_UART5] = {0x24, 21},
[MA35D1_RESET_UART6] = {0x24, 22},
[MA35D1_RESET_UART7] = {0x24, 23},
[MA35D1_RESET_CANFD0] = {0x24, 24},
[MA35D1_RESET_CANFD1] = {0x24, 25},
[MA35D1_RESET_EADC0] = {0x24, 28},
[MA35D1_RESET_I2S0] = {0x24, 29},
[MA35D1_RESET_SC0] = {0x28, 0},
[MA35D1_RESET_SC1] = {0x28, 1},
[MA35D1_RESET_QSPI1] = {0x28, 4},
[MA35D1_RESET_SPI3] = {0x28, 6},
[MA35D1_RESET_EPWM0] = {0x28, 16},
[MA35D1_RESET_EPWM1] = {0x28, 17},
[MA35D1_RESET_QEI0] = {0x28, 22},
[MA35D1_RESET_QEI1] = {0x28, 23},
[MA35D1_RESET_ECAP0] = {0x28, 26},
[MA35D1_RESET_ECAP1] = {0x28, 27},
[MA35D1_RESET_CANFD2] = {0x28, 28},
[MA35D1_RESET_ADC0] = {0x28, 31},
[MA35D1_RESET_TMR4] = {0x2C, 0},
[MA35D1_RESET_TMR5] = {0x2C, 1},
[MA35D1_RESET_TMR6] = {0x2C, 2},
[MA35D1_RESET_TMR7] = {0x2C, 3},
[MA35D1_RESET_TMR8] = {0x2C, 4},
[MA35D1_RESET_TMR9] = {0x2C, 5},
[MA35D1_RESET_TMR10] = {0x2C, 6},
[MA35D1_RESET_TMR11] = {0x2C, 7},
[MA35D1_RESET_UART8] = {0x2C, 8},
[MA35D1_RESET_UART9] = {0x2C, 9},
[MA35D1_RESET_UART10] = {0x2C, 10},
[MA35D1_RESET_UART11] = {0x2C, 11},
[MA35D1_RESET_UART12] = {0x2C, 12},
[MA35D1_RESET_UART13] = {0x2C, 13},
[MA35D1_RESET_UART14] = {0x2C, 14},
[MA35D1_RESET_UART15] = {0x2C, 15},
[MA35D1_RESET_UART16] = {0x2C, 16},
[MA35D1_RESET_I2S1] = {0x2C, 17},
[MA35D1_RESET_I2C4] = {0x2C, 18},
[MA35D1_RESET_I2C5] = {0x2C, 19},
[MA35D1_RESET_EPWM2] = {0x2C, 20},
[MA35D1_RESET_ECAP2] = {0x2C, 21},
[MA35D1_RESET_QEI2] = {0x2C, 22},
[MA35D1_RESET_CANFD3] = {0x2C, 23},
[MA35D1_RESET_KPI] = {0x2C, 24},
[MA35D1_RESET_GIC] = {0x2C, 28},
[MA35D1_RESET_SSMCC] = {0x2C, 30},
[MA35D1_RESET_SSPCC] = {0x2C, 31}
};

static int ma35d1_restart_handler(struct notifier_block *this, unsigned long mode, void *cmd)
{
struct ma35d1_reset_data *data =
container_of(this, struct ma35d1_reset_data, restart_handler);
u32 id = MA35D1_RESET_CHIP;

writel_relaxed(BIT(ma35d1_reset_map[id].bit),
data->base + ma35d1_reset_map[id].reg_ofs);
return 0;
}

static int ma35d1_reset_update(struct reset_controller_dev *rcdev, unsigned long id, bool assert)
{
struct ma35d1_reset_data *data = container_of(rcdev, struct ma35d1_reset_data, rcdev);
unsigned long flags;
u32 reg;

if (WARN_ON_ONCE(id >= ARRAY_SIZE(ma35d1_reset_map)))
return -EINVAL;

spin_lock_irqsave(&data->lock, flags);
reg = readl_relaxed(data->base + ma35d1_reset_map[id].reg_ofs);
if (assert)
reg |= BIT(ma35d1_reset_map[id].bit);
else
reg &= ~(BIT(ma35d1_reset_map[id].bit));
writel_relaxed(reg, data->base + ma35d1_reset_map[id].reg_ofs);
spin_unlock_irqrestore(&data->lock, flags);

return 0;
}

static int ma35d1_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
return ma35d1_reset_update(rcdev, id, true);
}

static int ma35d1_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
{
return ma35d1_reset_update(rcdev, id, false);
}

static int ma35d1_reset_status(struct reset_controller_dev *rcdev, unsigned long id)
{
struct ma35d1_reset_data *data = container_of(rcdev, struct ma35d1_reset_data, rcdev);
u32 reg;

if (WARN_ON_ONCE(id >= ARRAY_SIZE(ma35d1_reset_map)))
return -EINVAL;

reg = readl_relaxed(data->base + ma35d1_reset_map[id].reg_ofs);
return !!(reg & BIT(ma35d1_reset_map[id].bit));
}

static const struct reset_control_ops ma35d1_reset_ops = {
.assert = ma35d1_reset_assert,
.deassert = ma35d1_reset_deassert,
.status = ma35d1_reset_status,
};

static const struct of_device_id ma35d1_reset_dt_ids[] = {
{ .compatible = "nuvoton,ma35d1-reset" },
{ },
};

static int ma35d1_reset_probe(struct platform_device *pdev)
{
struct ma35d1_reset_data *reset_data;
struct device *dev = &pdev->dev;
int err;

if (!pdev->dev.of_node) {
dev_err(&pdev->dev, "Device tree node not found\n");
return -EINVAL;
}

reset_data = devm_kzalloc(dev, sizeof(*reset_data), GFP_KERNEL);
if (!reset_data)
return -ENOMEM;

reset_data->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(reset_data->base))
return PTR_ERR(reset_data->base);

reset_data->rcdev.owner = THIS_MODULE;
reset_data->rcdev.nr_resets = MA35D1_RESET_COUNT;
reset_data->rcdev.ops = &ma35d1_reset_ops;
reset_data->rcdev.of_node = dev->of_node;
reset_data->restart_handler.notifier_call = ma35d1_restart_handler;
reset_data->restart_handler.priority = 192;
spin_lock_init(&reset_data->lock);

err = register_restart_handler(&reset_data->restart_handler);
if (err)
dev_warn(&pdev->dev, "failed to register restart handler\n");

return devm_reset_controller_register(dev, &reset_data->rcdev);
}

static struct platform_driver ma35d1_reset_driver = {
.probe = ma35d1_reset_probe,
.driver = {
.name = "ma35d1-reset",
.of_match_table = ma35d1_reset_dt_ids,
},
};

builtin_platform_driver(ma35d1_reset_driver);

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