[PATCH v7 10/12] reset: Add Nuvoton ma35d1 reset driver support
From: Jacky Huang
Date: Wed Apr 12 2023 - 01:39:57 EST
From: Jacky Huang <ychuang3@xxxxxxxxxxx>
This driver supports individual IP reset for ma35d1. The reset
control registers is a subset of system control registers.
Signed-off-by: Jacky Huang <ychuang3@xxxxxxxxxxx>
---
drivers/reset/Kconfig | 6 +
drivers/reset/Makefile | 1 +
drivers/reset/reset-ma35d1.c | 255 +++++++++++++++++++++++++++++++++++
3 files changed, 262 insertions(+)
create mode 100644 drivers/reset/reset-ma35d1.c
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 2a52c990d4fe..58477c6ca9b8 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_NUVOTON || 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 3e7e5fd633a8..fd52dcf66a99 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -20,6 +20,7 @@ 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..57ed710c10f4
--- /dev/null
+++ b/drivers/reset/reset-ma35d1.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Nuvoton Technology Corp.
+ * Author: Chi-Fang Li <cfli0@xxxxxxxxxxx>
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/reset-controller.h>
+#include <dt-bindings/reset/nuvoton,ma35d1-reset.h>
+
+struct ma35d1_reset_data {
+ struct reset_controller_dev rcdev;
+ void __iomem *base;
+};
+
+struct ma35d1_reboot_data {
+ struct notifier_block restart_handler;
+ void __iomem *base;
+};
+
+static const struct {
+ unsigned long id;
+ 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_UAER3, 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 u32 ma35d1_reset_map_lookup(unsigned long id)
+{
+ u32 i;
+
+ for (i = 0; i < ARRAY_SIZE(ma35d1_reset_map); i++) {
+ if (ma35d1_reset_map[i].id == id)
+ break;
+ }
+ return i;
+}
+
+static int ma35d1_restart_handler(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ u32 i;
+ struct ma35d1_reboot_data *data = container_of(this,
+ struct ma35d1_reboot_data,
+ restart_handler);
+
+ i = ma35d1_reset_map_lookup(MA35D1_RESET_CHIP);
+ writel_relaxed(BIT(ma35d1_reset_map[i].bit),
+ data->base + ma35d1_reset_map[i].reg_ofs);
+ return 0;
+}
+
+static int ma35d1_reset_update(struct reset_controller_dev *rcdev,
+ unsigned long id, bool assert)
+{
+ u32 i, reg;
+ struct ma35d1_reset_data *data = container_of(rcdev,
+ struct ma35d1_reset_data,
+ rcdev);
+
+ i = ma35d1_reset_map_lookup(id);
+ reg = readl_relaxed(data->base + ma35d1_reset_map[i].reg_ofs);
+ if (assert)
+ reg |= BIT(ma35d1_reset_map[i].bit);
+ else
+ reg &= ~(BIT(ma35d1_reset_map[i].bit));
+ writel_relaxed(reg, data->base + ma35d1_reset_map[i].reg_ofs);
+
+ 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)
+{
+ u32 i, reg;
+ struct ma35d1_reset_data *data = container_of(rcdev,
+ struct ma35d1_reset_data,
+ rcdev);
+
+ i = ma35d1_reset_map_lookup(id);
+ reg = readl_relaxed(data->base + ma35d1_reset_map[i].reg_ofs);
+ return !!(reg & BIT(ma35d1_reset_map[i].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)
+{
+ int err;
+ struct device *dev = &pdev->dev;
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ struct ma35d1_reset_data *reset_data;
+ struct ma35d1_reboot_data *reboot_data;
+
+ 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;
+
+ reboot_data = devm_kzalloc(dev, sizeof(*reboot_data), GFP_KERNEL);
+ if (!reboot_data)
+ return -ENOMEM;
+
+ reset_data->base = devm_ioremap_resource(&pdev->dev, res);
+ 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;
+
+ reboot_data->base = reset_data->base;
+ reboot_data->restart_handler.notifier_call = ma35d1_restart_handler;
+ reboot_data->restart_handler.priority = 192;
+
+ err = register_restart_handler(&reboot_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