[RFC PATCH 3/6] pinctrl: starfive: jh8100: add pinctrl driver for sys_west domain

[Alex Soo <yuklin.soo@starfivetech.com>]

Add pinctrl driver for sys_west domain.

Signed-off-by: Alex Soo <yuklin.soo@starfivetech.com>
Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
---
 drivers/pinctrl/starfive/Kconfig              |  12 +
 drivers/pinctrl/starfive/Makefile             |   1 +
 .../pinctrl-starfive-jh8100-sys-west.c        | 264 ++++++++++++++++++
 .../starfive/pinctrl-starfive-jh8100.h        |   2 +
 4 files changed, 279 insertions(+)
 create mode 100644 drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-west.c

diff --git a/drivers/pinctrl/starfive/Kconfig b/drivers/pinctrl/starfive/Kconfig
index afcbf9d4dc8d..d78f161a636c 100644
--- a/drivers/pinctrl/starfive/Kconfig
+++ b/drivers/pinctrl/starfive/Kconfig
@@ -70,3 +70,15 @@ config PINCTRL_STARFIVE_JH8100_SYS_EAST
 	  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_JH8100_SYS_WEST
+	tristate "StarFive JH8100 SoC System IOMUX-West pinctrl and GPIO driver"
+	depends on ARCH_STARFIVE  || COMPILE_TEST
+	depends on OF
+	select PINCTRL_STARFIVE_JH8100
+	default ARCH_STARFIVE
+	help
+	  Say yes here to support system iomux-west pin control on the StarFive JH8100 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.
diff --git a/drivers/pinctrl/starfive/Makefile b/drivers/pinctrl/starfive/Makefile
index 45698c502b48..784465157ae2 100644
--- a/drivers/pinctrl/starfive/Makefile
+++ b/drivers/pinctrl/starfive/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_PINCTRL_STARFIVE_JH7110_AON)	+= pinctrl-starfive-jh7110-aon.o
 
 obj-$(CONFIG_PINCTRL_STARFIVE_JH8100)		+= pinctrl-starfive-jh8100.o
 obj-$(CONFIG_PINCTRL_STARFIVE_JH8100_SYS_EAST)	+= pinctrl-starfive-jh8100-sys-east.o
+obj-$(CONFIG_PINCTRL_STARFIVE_JH8100_SYS_WEST)	+= pinctrl-starfive-jh8100-sys-west.o
diff --git a/drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-west.c b/drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-west.c
new file mode 100644
index 000000000000..398821fc1f78
--- /dev/null
+++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-west.c
@@ -0,0 +1,264 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Pinctrl / GPIO driver for StarFive JH8100 SoC sys west controller
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ * Author: Alex Soo <yuklin.soo@starfivetech.com>
+ *
+ */
+
+#include <linux/bits.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/spinlock.h>
+
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+
+#include <dt-bindings/pinctrl/starfive,jh8100-pinctrl.h>
+
+#include "../core.h"
+#include "../pinctrl-utils.h"
+#include "../pinmux.h"
+#include "../pinconf.h"
+#include "pinctrl-starfive-jh8100.h"
+
+#define JH8100_SYS_W_NGPIO			16
+#define JH8100_SYS_W_GC_BASE			0
+
+/* registers */
+#define JH8100_SYS_W_DOEN			0x000
+#define JH8100_SYS_W_DOUT			0x010
+#define JH8100_SYS_W_GPI			0x020
+#define JH8100_SYS_W_GPIOIN			0x068
+
+#define JH8100_SYS_W_GPIOEN			0x048
+#define JH8100_SYS_W_GPIOIS0			0x04c
+#define JH8100_SYS_W_GPIOIC0			0x050
+#define JH8100_SYS_W_GPIOIBE0			0x054
+#define JH8100_SYS_W_GPIOIEV0			0x058
+#define JH8100_SYS_W_GPIOIE0			0x05c
+#define JH8100_SYS_W_GPIORIS0			0x060
+#define JH8100_SYS_W_GPIOMIS0			0x064
+
+#define JH8100_SYS_W_GPO_PDA_00_15_CFG		0x074
+
+static const struct pinctrl_pin_desc jh8100_sys_w_pins[] = {
+	PINCTRL_PIN(PAD_GPIO0_W,	"SYS_W_GPIO0"),
+	PINCTRL_PIN(PAD_GPIO1_W,	"SYS_W_GPIO1"),
+	PINCTRL_PIN(PAD_GPIO2_W,	"SYS_W_GPIO2"),
+	PINCTRL_PIN(PAD_GPIO3_W,	"SYS_W_GPIO3"),
+	PINCTRL_PIN(PAD_GPIO4_W,	"SYS_W_GPIO4"),
+	PINCTRL_PIN(PAD_GPIO5_W,	"SYS_W_GPIO5"),
+	PINCTRL_PIN(PAD_GPIO6_W,	"SYS_W_GPIO6"),
+	PINCTRL_PIN(PAD_GPIO7_W,	"SYS_W_GPIO7"),
+	PINCTRL_PIN(PAD_GPIO8_W,	"SYS_W_GPIO8"),
+	PINCTRL_PIN(PAD_GPIO9_W,	"SYS_W_GPIO9"),
+	PINCTRL_PIN(PAD_GPIO10_W,	"SYS_W_GPIO10"),
+	PINCTRL_PIN(PAD_GPIO11_W,	"SYS_W_GPIO11"),
+	PINCTRL_PIN(PAD_GPIO12_W,	"SYS_W_GPIO12"),
+	PINCTRL_PIN(PAD_GPIO13_W,	"SYS_W_GPIO13"),
+	PINCTRL_PIN(PAD_GPIO14_W,	"SYS_W_GPIO14"),
+	PINCTRL_PIN(PAD_GPIO15_W,	"SYS_W_GPIO15"),
+};
+
+struct jh8100_sys_w_func_sel {
+	u16 offset;
+	u8 shift;
+	u8 max;
+};
+
+static const struct jh8100_sys_w_func_sel
+	jh8100_sys_w_func_sel[ARRAY_SIZE(jh8100_sys_w_pins)] = {
+	[PAD_GPIO0_W]    = { 0xb4,  0, 2 },
+	[PAD_GPIO1_W]    = { 0xb4, 12, 2 },
+	[PAD_GPIO2_W]    = { 0xb4, 14, 2 },
+	[PAD_GPIO3_W]    = { 0xb4, 16, 2 },
+	[PAD_GPIO4_W]    = { 0xb4, 18, 2 },
+	[PAD_GPIO5_W]    = { 0xb4, 20, 2 },
+	[PAD_GPIO6_W]    = { 0xb4, 22, 2 },
+	[PAD_GPIO7_W]    = { 0xb4, 24, 2 },
+	[PAD_GPIO8_W]    = { 0xb4, 26, 2 },
+	[PAD_GPIO9_W]    = { 0xb4, 28, 2 },
+	[PAD_GPIO10_W]   = { 0xb4,  2, 2 },
+	[PAD_GPIO11_W]   = { 0xb4,  4, 2 },
+	[PAD_GPIO12_W]   = { 0xb4,  6, 2 },
+	[PAD_GPIO13_W]   = { 0xb4,  8, 2 },
+	[PAD_GPIO14_W]   = { 0xb4, 10, 2 },
+};
+
+static void jh8100_sys_w_set_function(struct jh8100_pinctrl *sfp,
+				      unsigned int pin, u32 func)
+{
+	const struct jh8100_sys_w_func_sel *fs = &jh8100_sys_w_func_sel[pin];
+	unsigned long flags;
+	void __iomem *reg;
+	u32 mask;
+
+	if (!fs->offset)
+		return;
+
+	if (func > fs->max)
+		return;
+
+	reg = sfp->base + fs->offset;
+	func = func << fs->shift;
+	mask = 0x3U << fs->shift;
+
+	raw_spin_lock_irqsave(&sfp->lock, flags);
+	func |= readl_relaxed(reg) & ~mask;
+	writel_relaxed(func, reg);
+	raw_spin_unlock_irqrestore(&sfp->lock, flags);
+}
+
+static int jh8100_sys_w_set_one_pin_mux(struct jh8100_pinctrl *sfp,
+					unsigned int pin,
+					unsigned int din, u32 dout,
+					u32 doen, u32 func)
+{
+	if (pin < sfp->gc.ngpio - 1 && func == 0)
+		jh8100_set_gpiomux(sfp, pin, din, dout, doen);
+
+	if (pin < sfp->gc.ngpio - 1 && func == 2)
+		jh8100_sys_w_set_function(sfp, pin, func);
+
+	return 0;
+}
+
+static int jh8100_sys_w_get_padcfg_base(struct jh8100_pinctrl *sfp,
+					unsigned int pin)
+{
+	if (pin <= PAD_GPIO15_W)
+		return JH8100_SYS_W_GPO_PDA_00_15_CFG;
+	else
+		return -1;
+}
+
+static void jh8100_sys_w_irq_handler(struct irq_desc *desc)
+{
+	struct jh8100_pinctrl *sfp = jh8100_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 + JH8100_SYS_W_GPIOMIS0);
+	for_each_set_bit(pin, &mis, 16)
+		generic_handle_domain_irq(sfp->gc.irq.domain, pin);
+
+	chained_irq_exit(chip, desc);
+}
+
+static int jh8100_sys_w_init_hw(struct gpio_chip *gc)
+{
+	struct jh8100_pinctrl *sfp = container_of(gc,
+			struct jh8100_pinctrl, gc);
+
+	/* mask all GPIO interrupts */
+	writel(0U, sfp->base + JH8100_SYS_W_GPIOIE0);
+	/* clear edge interrupt flags */
+	writel(0U, sfp->base + JH8100_SYS_W_GPIOIC0);
+	writel(~0U, sfp->base + JH8100_SYS_W_GPIOIC0);
+	/* enable GPIO interrupts */
+	writel(1U, sfp->base + JH8100_SYS_W_GPIOEN);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int jh8100_sys_w_pinctrl_suspend(struct device *dev)
+{
+	struct jh8100_pinctrl *sfp;
+	int i;
+
+	sfp = dev_get_drvdata(dev);
+	if (!sfp)
+		return -EINVAL;
+
+	for (i = 0; i < JH8100_SYS_WEST_REG_NUM; i++)
+		sfp->jh8100_sys_west_regs[i] = readl_relaxed(sfp->base + (i * 4));
+
+	return pinctrl_force_sleep(sfp->pctl);
+}
+
+static int jh8100_sys_w_pinctrl_resume(struct device *dev)
+{
+	struct jh8100_pinctrl *sfp;
+	int i;
+
+	sfp = dev_get_drvdata(dev);
+	if (!sfp)
+		return -EINVAL;
+
+	for (i = 0; i < JH8100_SYS_WEST_REG_NUM; i++)
+		writel_relaxed(sfp->jh8100_sys_west_regs[i], sfp->base + (i * 4));
+
+	return pinctrl_force_default(sfp->pctl);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(jh8100_sys_w_pinctrl_dev_pm_ops,
+			 jh8100_sys_w_pinctrl_suspend,
+			 jh8100_sys_w_pinctrl_resume);
+
+static const struct jh8100_gpio_irq_reg jh8100_sys_w_irq_reg = {
+	.is_reg_base	= JH8100_SYS_W_GPIOIS0,
+	.ic_reg_base	= JH8100_SYS_W_GPIOIC0,
+	.ibe_reg_base	= JH8100_SYS_W_GPIOIBE0,
+	.iev_reg_base	= JH8100_SYS_W_GPIOIEV0,
+	.ie_reg_base	= JH8100_SYS_W_GPIOIE0,
+	.ris_reg_base	= JH8100_SYS_W_GPIORIS0,
+	.mis_reg_base	= JH8100_SYS_W_GPIOMIS0,
+};
+
+static const struct jh8100_pinctrl_soc_info jh8100_sys_w_pinctrl_info = {
+	.pins				= jh8100_sys_w_pins,
+	.npins				= ARRAY_SIZE(jh8100_sys_w_pins),
+	.ngpios				= JH8100_SYS_W_NGPIO,
+	.gc_base			= JH8100_SYS_W_GC_BASE,
+	.dout_reg_base			= JH8100_SYS_W_DOUT,
+	.dout_mask			= GENMASK(5, 0),
+	.doen_reg_base			= JH8100_SYS_W_DOEN,
+	.doen_mask			= GENMASK(4, 0),
+	.gpi_reg_base			= JH8100_SYS_W_GPI,
+	.gpi_mask			= GENMASK(4, 0),
+	.gpioin_reg_base		= JH8100_SYS_W_GPIOIN,
+	.irq_reg			= &jh8100_sys_w_irq_reg,
+	.jh8100_set_one_pin_mux		= jh8100_sys_w_set_one_pin_mux,
+	.jh8100_get_padcfg_base		= jh8100_sys_w_get_padcfg_base,
+	.jh8100_gpio_irq_handler	= jh8100_sys_w_irq_handler,
+	.jh8100_gpio_init_hw		= jh8100_sys_w_init_hw,
+};
+
+static const struct of_device_id jh8100_sys_w_pinctrl_of_match[] = {
+	{
+		.compatible = "starfive,jh8100-sys-pinctrl-west",
+		.data = &jh8100_sys_w_pinctrl_info,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jh8100_sys_w_pinctrl_of_match);
+
+static struct platform_driver jh8100_sys_w_pinctrl_driver = {
+	.probe = jh8100_pinctrl_probe,
+	.driver = {
+		.name = "starfive-jh8100-sys-pinctrl-west",
+#ifdef CONFIG_PM_SLEEP
+		.pm = &jh8100_sys_w_pinctrl_dev_pm_ops,
+#endif
+		.of_match_table = jh8100_sys_w_pinctrl_of_match,
+	},
+};
+module_platform_driver(jh8100_sys_w_pinctrl_driver);
+
+MODULE_DESCRIPTION("Pinctrl driver for the StarFive JH8100 SoC sys west controller");
+MODULE_AUTHOR("Alex Soo <yuklin.soo@starfivetech.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/starfive/pinctrl-starfive-jh8100.h b/drivers/pinctrl/starfive/pinctrl-starfive-jh8100.h
index d84b88c0568d..6264931ddb82 100644
--- a/drivers/pinctrl/starfive/pinctrl-starfive-jh8100.h
+++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh8100.h
@@ -13,6 +13,7 @@
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/pinctrl/pinmux.h>
 
+#define JH8100_SYS_WEST_REG_NUM		44
 #define JH8100_SYS_EAST_REG_NUM		116
 
 struct jh8100_pinctrl {
@@ -25,6 +26,7 @@ struct jh8100_pinctrl {
 	/* register read/write mutex */
 	struct mutex mutex;
 	const struct jh8100_pinctrl_soc_info *info;
+	unsigned int jh8100_sys_west_regs[JH8100_SYS_WEST_REG_NUM];
 	unsigned int jh8100_sys_east_regs[JH8100_SYS_EAST_REG_NUM];
 	/* wakeup */
 	int wakeup_gpio;
-- 
2.25.1


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