Mailing List Archive

From: Jacky Huang <ychuang3@nuvoton.com>

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>
---
drivers/reset/Kconfig | 6 +
drivers/reset/Makefile | 1 +
drivers/reset/reset-ma35d1.c | 235 +++++++++++++++++++++++++++++++++++
3 files changed, 242 insertions(+)
create mode 100644 drivers/reset/reset-ma35d1.c

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 6aa8f243b30c..07499177a266 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -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

diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 7fec5af6c964..411b45ba0da7 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -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
diff --git a/drivers/reset/reset-ma35d1.c b/drivers/reset/reset-ma35d1.c
new file mode 100644
index 000000000000..54e53863c98a
--- /dev/null
+++ b/drivers/reset/reset-ma35d1.c
@@ -0,0 +1,235 @@
+// 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);
--
2.34.1