[RFC PATCH v3 4/7] pinctrl: starfive: jh8100: add sys_gmac domain sub-driver

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

Add sys_gmac domain sub-driver.

Signed-off-by: Alex Soo <yuklin.soo@starfivetech.com>
---
 drivers/pinctrl/starfive/Kconfig              | 12 +++
 drivers/pinctrl/starfive/Makefile             |  1 +
 .../pinctrl-starfive-jh8100-sys-gmac.c        | 89 +++++++++++++++++++
 .../starfive/pinctrl-starfive-jh8100.h        |  4 +
 4 files changed, 106 insertions(+)
 create mode 100644 drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-gmac.c

diff --git a/drivers/pinctrl/starfive/Kconfig b/drivers/pinctrl/starfive/Kconfig
index d78f161a636c..bc123c0bf35e 100644
--- a/drivers/pinctrl/starfive/Kconfig
+++ b/drivers/pinctrl/starfive/Kconfig
@@ -82,3 +82,15 @@ config PINCTRL_STARFIVE_JH8100_SYS_WEST
 	  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_GMAC
+	tristate "StarFive JH8100 SoC System IOMUX-GMAC 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-gmac pin control on the StarFive JH8100 SoC.
+	  This provides syscon registers to indicate voltage level on SDIO1/GMAC1, to indicate
+	  GMAC1 pads voltage level under different GMAC interface modes, and to configure
+	  GMAC1 interface slew rate.
diff --git a/drivers/pinctrl/starfive/Makefile b/drivers/pinctrl/starfive/Makefile
index 784465157ae2..236a693a8aef 100644
--- a/drivers/pinctrl/starfive/Makefile
+++ b/drivers/pinctrl/starfive/Makefile
@@ -9,3 +9,4 @@ 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
+obj-$(CONFIG_PINCTRL_STARFIVE_JH8100_SYS_GMAC)	+= pinctrl-starfive-jh8100-sys-gmac.o
diff --git a/drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-gmac.c b/drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-gmac.c
new file mode 100644
index 000000000000..3758280e3660
--- /dev/null
+++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh8100-sys-gmac.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Pinctrl / GPIO driver for StarFive JH8100 SoC sys gmac controller
+ *
+ * Copyright (C) 2023-2024 StarFive Technology Co., Ltd.
+ * Author: Alex Soo <yuklin.soo@starfivetech.com>
+ *
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <dt-bindings/pinctrl/starfive,jh8100-pinctrl.h>
+
+#include "pinctrl-starfive-jh8100.h"
+
+#define JH8100_SYS_G_GC_BASE			-1
+#define JH8100_SYS_G_DOMAIN_NAME		"jh8100-sys-gmac"
+
+#ifdef CONFIG_PM_SLEEP
+static int jh8100_sys_gmac_pinctrl_suspend(struct device *dev)
+{
+	struct jh8100_pinctrl *sfp;
+	int i;
+
+	sfp = dev_get_drvdata(dev);
+	if (!sfp)
+		return -EINVAL;
+
+	for (i = 0; i < sfp->info->nregs; i++)
+		sfp->jh8100_sys_gmac_regs[i] = readl_relaxed(sfp->base + (i * 4));
+
+	return pinctrl_force_sleep(sfp->pctl);
+}
+
+static int jh8100_sys_gmac_pinctrl_resume(struct device *dev)
+{
+	struct jh8100_pinctrl *sfp;
+	int i;
+
+	sfp = dev_get_drvdata(dev);
+	if (!sfp)
+		return -EINVAL;
+
+	for (i = 0; i < sfp->info->nregs; i++)
+		writel_relaxed(sfp->jh8100_sys_gmac_regs[i], sfp->base + (i * 4));
+
+	return pinctrl_force_default(sfp->pctl);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(jh8100_sys_gmac_pinctrl_dev_pm_ops,
+			 jh8100_sys_gmac_pinctrl_suspend,
+			 jh8100_sys_gmac_pinctrl_resume);
+
+static const struct jh8100_pinctrl_domain_info jh8100_sys_gmac_pinctrl_info = {
+	.ngpios		= JH8100_SYS_G_NGPIO,
+	.gc_base	= JH8100_SYS_G_GC_BASE,
+	.name		= JH8100_SYS_G_DOMAIN_NAME,
+	.nregs		= JH8100_SYS_G_REG_NUM,
+};
+
+static const struct of_device_id jh8100_sys_gmac_pinctrl_of_match[] = {
+	{
+		.compatible = "starfive,jh8100-sys-pinctrl-gmac",
+		.data = &jh8100_sys_gmac_pinctrl_info,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jh8100_sys_gmac_pinctrl_of_match);
+
+static struct platform_driver jh8100_sys_gmac_pinctrl_driver = {
+	.probe = jh8100_pinctrl_probe,
+	.driver = {
+		.name = "starfive-jh8100-sys-pinctrl-gmac",
+#ifdef CONFIG_PM_SLEEP
+		.pm = &jh8100_sys_gmac_pinctrl_dev_pm_ops,
+#endif
+		.of_match_table = jh8100_sys_gmac_pinctrl_of_match,
+	},
+};
+module_platform_driver(jh8100_sys_gmac_pinctrl_driver);
+
+MODULE_DESCRIPTION("Pinctrl driver for StarFive JH8100 SoC sys gmac 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 7c7a05c1c828..90eef6417dd7 100644
--- a/drivers/pinctrl/starfive/pinctrl-starfive-jh8100.h
+++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh8100.h
@@ -14,12 +14,15 @@
 
 #define JH8100_SYS_W_DOMAIN_NAME	"jh8100-sys-west"
 #define JH8100_SYS_E_DOMAIN_NAME	"jh8100-sys-east"
+#define JH8100_SYS_G_DOMAIN_NAME	"jh8100-sys-gmac"
 
 #define JH8100_SYS_W_NGPIO		16
 #define JH8100_SYS_E_NGPIO		48
+#define JH8100_SYS_G_NGPIO		0
 
 #define JH8100_SYS_W_REG_NUM		44
 #define JH8100_SYS_E_REG_NUM		116
+#define JH8100_SYS_G_REG_NUM		19
 
 #define JH8100_SYS_W_GPO_PDA_00_15_CFG	0x074
 #define JH8100_SYS_E_GPO_PDA_00_47_CFG	0x114
@@ -36,6 +39,7 @@ struct jh8100_pinctrl {
 	const struct jh8100_pinctrl_domain_info *info;
 	unsigned int jh8100_sys_west_regs[JH8100_SYS_W_REG_NUM];
 	unsigned int jh8100_sys_east_regs[JH8100_SYS_E_REG_NUM];
+	unsigned int jh8100_sys_gmac_regs[JH8100_SYS_G_REG_NUM];
 	/* wakeup */
 	struct irq_domain *irq_domain;
 	struct gpio_desc *wakeup_gpio;
-- 
2.25.1