pinctrl: starfive: Add StarFive JH7110 aon controller driver

Add pinctrl driver for StarFive JH7110 SoC aon pinctrl controller.

Co-developed-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Jianlong Huang <jianlong.huang@starfivetech.com>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
Link: https://lore.kernel.org/r/20230209143702.44408-5-hal.feng@starfivetech.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/starfive/Kconfig

@@ -37,3 +37,15 @@ config PINCTRL_STARFIVE_JH7110_SYS
 	  This also provides an interface to the GPIO pins not used by other
 	  peripherals supporting inputs, outputs, configuring pull-up/pull-down
 	  and interrupts on input changes.
+
+config PINCTRL_STARFIVE_JH7110_AON
+	tristate "Always-on pinctrl and GPIO driver for the StarFive JH7110 SoC"
+	depends on SOC_STARFIVE  || COMPILE_TEST
+	depends on OF
+	select PINCTRL_STARFIVE_JH7110
+	default SOC_STARFIVE
+	help
+	  Say yes here to support always-on pin control on the StarFive JH7110 SoC.
+	  This also provides an interface to the GPIO pins not used by other
+	  peripherals supporting inputs, outputs, configuring pull-up/pull-down
+	  and interrupts on input changes.

drivers/pinctrl/starfive/Makefile

@@ -4,3 +4,4 @@ obj-$(CONFIG_PINCTRL_STARFIVE_JH7100)	+= pinctrl-starfive-jh7100.o
 
 obj-$(CONFIG_PINCTRL_STARFIVE_JH7110)		+= pinctrl-starfive-jh7110.o
 obj-$(CONFIG_PINCTRL_STARFIVE_JH7110_SYS)	+= pinctrl-starfive-jh7110-sys.o
+obj-$(CONFIG_PINCTRL_STARFIVE_JH7110_AON)	+= pinctrl-starfive-jh7110-aon.o

drivers/pinctrl/starfive/pinctrl-starfive-jh7110-aon.c

@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Pinctrl / GPIO driver for StarFive JH7110 SoC aon controller
+ *
+ * Copyright (C) 2022 StarFive Technology Co., Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/pinctrl/starfive,jh7110-pinctrl.h>
+
+#include "../core.h"
+#include "../pinconf.h"
+#include "../pinmux.h"
+#include "pinctrl-starfive-jh7110.h"
+
+#define JH7110_AON_NGPIO		4
+#define JH7110_AON_GC_BASE		64
+
+/* registers */
+#define JH7110_AON_DOEN			0x0
+#define JH7110_AON_DOUT			0x4
+#define JH7110_AON_GPI			0x8
+#define JH7110_AON_GPIOIN		0x2c
+
+#define JH7110_AON_GPIOEN		0xc
+#define JH7110_AON_GPIOIS		0x10
+#define JH7110_AON_GPIOIC		0x14
+#define JH7110_AON_GPIOIBE		0x18
+#define JH7110_AON_GPIOIEV		0x1c
+#define JH7110_AON_GPIOIE		0x20
+#define JH7110_AON_GPIORIS		0x28
+#define JH7110_AON_GPIOMIS		0x28
+
+#define JH7110_AON_GPO_PDA_0_5_CFG	0x30
+
+static const struct pinctrl_pin_desc jh7110_aon_pins[] = {
+	PINCTRL_PIN(PAD_TESTEN,		"TESTEN"),
+	PINCTRL_PIN(PAD_RGPIO0,		"RGPIO0"),
+	PINCTRL_PIN(PAD_RGPIO1,		"RGPIO1"),
+	PINCTRL_PIN(PAD_RGPIO2,		"RGPIO2"),
+	PINCTRL_PIN(PAD_RGPIO3,		"RGPIO3"),
+	PINCTRL_PIN(PAD_RSTN,		"RSTN"),
+	PINCTRL_PIN(PAD_GMAC0_MDC,	"GMAC0_MDC"),
+	PINCTRL_PIN(PAD_GMAC0_MDIO,	"GMAC0_MDIO"),
+	PINCTRL_PIN(PAD_GMAC0_RXD0,	"GMAC0_RXD0"),
+	PINCTRL_PIN(PAD_GMAC0_RXD1,	"GMAC0_RXD1"),
+	PINCTRL_PIN(PAD_GMAC0_RXD2,	"GMAC0_RXD2"),
+	PINCTRL_PIN(PAD_GMAC0_RXD3,	"GMAC0_RXD3"),
+	PINCTRL_PIN(PAD_GMAC0_RXDV,	"GMAC0_RXDV"),
+	PINCTRL_PIN(PAD_GMAC0_RXC,	"GMAC0_RXC"),
+	PINCTRL_PIN(PAD_GMAC0_TXD0,	"GMAC0_TXD0"),
+	PINCTRL_PIN(PAD_GMAC0_TXD1,	"GMAC0_TXD1"),
+	PINCTRL_PIN(PAD_GMAC0_TXD2,	"GMAC0_TXD2"),
+	PINCTRL_PIN(PAD_GMAC0_TXD3,	"GMAC0_TXD3"),
+	PINCTRL_PIN(PAD_GMAC0_TXEN,	"GMAC0_TXEN"),
+	PINCTRL_PIN(PAD_GMAC0_TXC,	"GMAC0_TXC"),
+};
+
+static int jh7110_aon_set_one_pin_mux(struct jh7110_pinctrl *sfp,
+				      unsigned int pin,
+				      unsigned int din, u32 dout,
+				      u32 doen, u32 func)
+{
+	if (pin < sfp->gc.ngpio && func == 0)
+		jh7110_set_gpiomux(sfp, pin, din, dout, doen);
+
+	return 0;
+}
+
+static int jh7110_aon_get_padcfg_base(struct jh7110_pinctrl *sfp,
+				      unsigned int pin)
+{
+	if (pin < PAD_GMAC0_MDC)
+		return JH7110_AON_GPO_PDA_0_5_CFG;
+
+	return -1;
+}
+
+static void jh7110_aon_irq_handler(struct irq_desc *desc)
+{
+	struct jh7110_pinctrl *sfp = jh7110_from_irq_desc(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	unsigned long mis;
+	unsigned int pin;
+
+	chained_irq_enter(chip, desc);
+
+	mis = readl_relaxed(sfp->base + JH7110_AON_GPIOMIS);
+	for_each_set_bit(pin, &mis, JH7110_AON_NGPIO)
+		generic_handle_domain_irq(sfp->gc.irq.domain, pin);
+
+	chained_irq_exit(chip, desc);
+}
+
+static int jh7110_aon_init_hw(struct gpio_chip *gc)
+{
+	struct jh7110_pinctrl *sfp = container_of(gc,
+			struct jh7110_pinctrl, gc);
+
+	/* mask all GPIO interrupts */
+	writel_relaxed(0, sfp->base + JH7110_AON_GPIOIE);
+	/* clear edge interrupt flags */
+	writel_relaxed(0, sfp->base + JH7110_AON_GPIOIC);
+	writel_relaxed(0x0f, sfp->base + JH7110_AON_GPIOIC);
+	/* enable GPIO interrupts */
+	writel_relaxed(1, sfp->base + JH7110_AON_GPIOEN);
+	return 0;
+}
+
+static const struct jh7110_gpio_irq_reg jh7110_aon_irq_reg = {
+	.is_reg_base	= JH7110_AON_GPIOIS,
+	.ic_reg_base	= JH7110_AON_GPIOIC,
+	.ibe_reg_base	= JH7110_AON_GPIOIBE,
+	.iev_reg_base	= JH7110_AON_GPIOIEV,
+	.ie_reg_base	= JH7110_AON_GPIOIE,
+	.ris_reg_base	= JH7110_AON_GPIORIS,
+	.mis_reg_base	= JH7110_AON_GPIOMIS,
+};
+
+static const struct jh7110_pinctrl_soc_info jh7110_aon_pinctrl_info = {
+	.pins		= jh7110_aon_pins,
+	.npins		= ARRAY_SIZE(jh7110_aon_pins),
+	.ngpios		= JH7110_AON_NGPIO,
+	.gc_base	= JH7110_AON_GC_BASE,
+	.dout_reg_base	= JH7110_AON_DOUT,
+	.dout_mask	= GENMASK(3, 0),
+	.doen_reg_base	= JH7110_AON_DOEN,
+	.doen_mask	= GENMASK(2, 0),
+	.gpi_reg_base	= JH7110_AON_GPI,
+	.gpi_mask	= GENMASK(3, 0),
+	.gpioin_reg_base	   = JH7110_AON_GPIOIN,
+	.irq_reg		   = &jh7110_aon_irq_reg,
+	.jh7110_set_one_pin_mux  = jh7110_aon_set_one_pin_mux,
+	.jh7110_get_padcfg_base  = jh7110_aon_get_padcfg_base,
+	.jh7110_gpio_irq_handler = jh7110_aon_irq_handler,
+	.jh7110_gpio_init_hw	 = jh7110_aon_init_hw,
+};
+
+static const struct of_device_id jh7110_aon_pinctrl_of_match[] = {
+	{
+		.compatible = "starfive,jh7110-aon-pinctrl",
+		.data = &jh7110_aon_pinctrl_info,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jh7110_aon_pinctrl_of_match);
+
+static struct platform_driver jh7110_aon_pinctrl_driver = {
+	.probe = jh7110_pinctrl_probe,
+	.driver = {
+		.name = "starfive-jh7110-aon-pinctrl",
+		.of_match_table = jh7110_aon_pinctrl_of_match,
+	},
+};
+module_platform_driver(jh7110_aon_pinctrl_driver);
+
+MODULE_DESCRIPTION("Pinctrl driver for the StarFive JH7110 SoC aon controller");
+MODULE_AUTHOR("Jianlong Huang <jianlong.huang@starfivetech.com>");
+MODULE_LICENSE("GPL");