pinctrl: mtmips: add support for MediaTek MT7621 SoC

This patch adds pinctrl support for MediaTek MT7621 SoC.
The MT7621 SoC supports pinconf, but it is not the same as mt7628.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

5 files changed, 330 insertions, 2 deletions

diff --git a/drivers/pinctrl/mtmips/Kconfig b/drivers/pinctrl/mtmips/Kconfig
index 844d5b7..456f3ea 100644
--- a/drivers/pinctrl/mtmips/Kconfig
+++ b/drivers/pinctrl/mtmips/Kconfig
@@ -12,6 +12,15 @@ config PINCTRL_MT7620
 	  The driver is controlled by a device tree node which contains
 	  the pin mux functions for each available pin groups.
 
+config PINCTRL_MT7621
+	bool "MediaTek MT7621 pin control driver"
+	select PINCTRL_MTMIPS
+	depends on SOC_MT7621 && PINCTRL_GENERIC
+	help
+	  Support pin multiplexing control on MediaTek MT7621.
+	  The driver is controlled by a device tree node which contains
+	  the pin mux functions for each available pin groups.
+
 config PINCTRL_MT7628
 	bool "MediaTek MT7628 pin control driver"
 	select PINCTRL_MTMIPS
diff --git a/drivers/pinctrl/mtmips/Makefile b/drivers/pinctrl/mtmips/Makefile
index ba945a8..8fece4f 100644
--- a/drivers/pinctrl/mtmips/Makefile
+++ b/drivers/pinctrl/mtmips/Makefile
@@ -5,4 +5,5 @@ obj-$(CONFIG_PINCTRL_MTMIPS) += pinctrl-mtmips-common.o
 
 # SoC Drivers
 obj-$(CONFIG_PINCTRL_MT7620) += pinctrl-mt7620.o
+obj-$(CONFIG_PINCTRL_MT7621) += pinctrl-mt7621.o
 obj-$(CONFIG_PINCTRL_MT7628) += pinctrl-mt7628.o
diff --git a/drivers/pinctrl/mtmips/pinctrl-mt7621.c b/drivers/pinctrl/mtmips/pinctrl-mt7621.c
new file mode 100644
index 0000000..3e98a01
--- /dev/null
+++ b/drivers/pinctrl/mtmips/pinctrl-mt7621.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 MediaTek Inc. All rights reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <dm.h>
+#include <dm/pinctrl.h>
+#include <dm/device_compat.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+
+#include "pinctrl-mtmips-common.h"
+
+#define SYSC_MAP_SIZE			0x100
+
+#define PAD_UART1_GPIO0_OFS		0x00
+#define PAD_UART3_I2C_OFS		0x04
+#define PAD_UART2_JTAG_OFS		0x08
+#define PAD_PERST_WDT_OFS		0x0c
+#define PAD_RGMII2_MDIO_OFS		0x10
+#define PAD_SDXC_SPI_OFS		0x14
+#define GPIOMODE_OFS			0x18
+#define PAD_BOPT_ESWINT_OFS		0x28
+
+#define ESWINT_SHIFT			20
+#define SDXC_SHIFT			18
+#define SPI_SHIFT			16
+#define RGMII2_SHIFT			15
+#define RGMII1_SHIFT			14
+#define MDIO_SHIFT			12
+#define PERST_SHIFT			10
+#define WDT_SHIFT			8
+#define JTAG_SHIFT			7
+#define UART2_SHIFT			5
+#define UART3_SHIFT			3
+#define I2C_SHIFT			2
+#define UART1_SHIFT			1
+#define GPIO0_SHIFT			0 /* Dummy */
+
+#define GM4_MASK			3
+
+#define E4_E2_M				0x03
+#define E4_E2_S				4
+#define PULL_UP				BIT(3)
+#define PULL_DOWN			BIT(2)
+#define SMT				BIT(1)
+#define SR				BIT(0)
+
+struct mt7621_pinctrl_priv {
+	struct mtmips_pinctrl_priv mp;
+};
+
+#if CONFIG_IS_ENABLED(PINMUX)
+static const struct mtmips_pmx_func esw_int_grp[] = {
+	FUNC("gpio", 1),
+	FUNC("esw int", 0),
+};
+
+static const struct mtmips_pmx_func sdxc_grp[] = {
+	FUNC("nand", 2),
+	FUNC("gpio", 1),
+	FUNC("sdxc", 0),
+};
+
+static const struct mtmips_pmx_func spi_grp[] = {
+	FUNC("nand", 2),
+	FUNC("gpio", 1),
+	FUNC("spi", 0),
+};
+
+static const struct mtmips_pmx_func rgmii2_grp[] = {
+	FUNC("gpio", 1),
+	FUNC("rgmii", 0),
+};
+
+static const struct mtmips_pmx_func rgmii1_grp[] = {
+	FUNC("gpio", 1),
+	FUNC("rgmii", 0),
+};
+
+static const struct mtmips_pmx_func mdio_grp[] = {
+	FUNC("gpio", 1),
+	FUNC("mdio", 0),
+};
+
+static const struct mtmips_pmx_func perst_grp[] = {
+	FUNC("refclk", 2),
+	FUNC("gpio", 1),
+	FUNC("pcie reset", 0),
+};
+
+static const struct mtmips_pmx_func wdt_grp[] = {
+	FUNC("refclk", 2),
+	FUNC("gpio", 1),
+	FUNC("wdt rst", 0),
+};
+
+static const struct mtmips_pmx_func jtag_grp[] = {
+	FUNC("gpio", 1),
+	FUNC("jtag", 0),
+};
+
+static const struct mtmips_pmx_func uart2_grp[] = {
+	FUNC("spdif", 3),
+	FUNC("pcm", 2),
+	FUNC("gpio", 1),
+	FUNC("uart", 0),
+};
+
+static const struct mtmips_pmx_func uart3_grp[] = {
+	FUNC("spdif", 3),
+	FUNC("i2s", 2),
+	FUNC("gpio", 1),
+	FUNC("uart", 0),
+};
+
+static const struct mtmips_pmx_func i2c_grp[] = {
+	FUNC("gpio", 1),
+	FUNC("i2c", 0),
+};
+
+static const struct mtmips_pmx_func uart1_grp[] = {
+	FUNC("gpio", 1),
+	FUNC("uart", 0),
+};
+
+static const struct mtmips_pmx_func gpio0_grp[] = {
+	FUNC("gpio", 0),
+};
+
+static const struct mtmips_pmx_group mt7621_pmx_data[] = {
+	GRP_PCONF("esw int", esw_int_grp, GPIOMODE_OFS, ESWINT_SHIFT, 1,
+		  PAD_BOPT_ESWINT_OFS, 0),
+	GRP_PCONF("sdxc", sdxc_grp, GPIOMODE_OFS, SDXC_SHIFT, GM4_MASK,
+		  PAD_SDXC_SPI_OFS, 16),
+	GRP_PCONF("spi", spi_grp, GPIOMODE_OFS, SPI_SHIFT, GM4_MASK,
+		  PAD_SDXC_SPI_OFS, 0),
+	GRP_PCONF("rgmii2", rgmii2_grp, GPIOMODE_OFS, RGMII2_SHIFT, 1,
+		  PAD_RGMII2_MDIO_OFS, 16),
+	GRP("rgmii1", rgmii1_grp, GPIOMODE_OFS, RGMII1_SHIFT, 1),
+	GRP_PCONF("mdio", mdio_grp, GPIOMODE_OFS, MDIO_SHIFT, GM4_MASK,
+		  PAD_RGMII2_MDIO_OFS, 0),
+	GRP_PCONF("pcie reset", perst_grp, GPIOMODE_OFS, PERST_SHIFT, GM4_MASK,
+		  PAD_PERST_WDT_OFS, 16),
+	GRP_PCONF("wdt", wdt_grp, GPIOMODE_OFS, WDT_SHIFT, GM4_MASK,
+		  PAD_PERST_WDT_OFS, 0),
+	GRP_PCONF("jtag", jtag_grp, GPIOMODE_OFS, JTAG_SHIFT, 1,
+		  PAD_UART2_JTAG_OFS, 16),
+	GRP_PCONF("uart2", uart2_grp, GPIOMODE_OFS, UART2_SHIFT, GM4_MASK,
+		  PAD_UART2_JTAG_OFS, 0),
+	GRP_PCONF("uart3", uart3_grp, GPIOMODE_OFS, UART3_SHIFT, GM4_MASK,
+		  PAD_UART3_I2C_OFS, 16),
+	GRP_PCONF("i2c", i2c_grp, GPIOMODE_OFS, I2C_SHIFT, 1,
+		  PAD_UART3_I2C_OFS, 0),
+	GRP_PCONF("uart1", uart1_grp, GPIOMODE_OFS, UART1_SHIFT, 1,
+		  PAD_UART1_GPIO0_OFS, 16),
+	GRP_PCONF("gpio0", gpio0_grp, GPIOMODE_OFS, GPIO0_SHIFT, 1,
+		  PAD_UART1_GPIO0_OFS, 0),
+};
+
+static int mt7621_get_groups_count(struct udevice *dev)
+{
+	return ARRAY_SIZE(mt7621_pmx_data);
+}
+
+static const char *mt7621_get_group_name(struct udevice *dev,
+					 unsigned int selector)
+{
+	return mt7621_pmx_data[selector].name;
+}
+#endif /* CONFIG_IS_ENABLED(PINMUX) */
+
+#if CONFIG_IS_ENABLED(PINCONF)
+static const struct pinconf_param mt7621_conf_params[] = {
+	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
+	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
+	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
+	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
+	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
+	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
+	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
+};
+
+static const u32 mt7621_pconf_drv_strength_tbl[] = {2, 4, 6, 8};
+
+static int mt7621_pinconf_group_set(struct udevice *dev,
+				    unsigned int group_selector,
+				    unsigned int param, unsigned int arg)
+{
+	struct mt7621_pinctrl_priv *priv = dev_get_priv(dev);
+	const struct mtmips_pmx_group *grp = &mt7621_pmx_data[group_selector];
+	u32 clr = 0, set = 0;
+	int i;
+
+	if (!grp->pconf_avail)
+		return 0;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		clr = PULL_UP | PULL_DOWN;
+		break;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		clr = PULL_DOWN;
+		set = PULL_UP;
+		break;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		clr = PULL_UP;
+		set = PULL_DOWN;
+		break;
+
+	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+		if (arg)
+			set = SMT;
+		else
+			clr = SMT;
+		break;
+
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		for (i = 0; i < ARRAY_SIZE(mt7621_pconf_drv_strength_tbl); i++)
+			if (mt7621_pconf_drv_strength_tbl[i] == arg)
+				break;
+
+		if (i >= ARRAY_SIZE(mt7621_pconf_drv_strength_tbl))
+			return -EINVAL;
+
+		clr = E4_E2_M << E4_E2_S;
+		set = i << E4_E2_S;
+		break;
+
+	case PIN_CONFIG_SLEW_RATE:
+		if (arg)
+			set = SR;
+		else
+			clr = SR;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	mtmips_pinctrl_reg_set(&priv->mp, grp->pconf_reg, grp->pconf_shift,
+			       clr, set);
+
+	return 0;
+}
+#endif
+
+static int mt7621_pinctrl_probe(struct udevice *dev)
+{
+	struct mt7621_pinctrl_priv *priv = dev_get_priv(dev);
+	int ret = 0;
+
+#if CONFIG_IS_ENABLED(PINMUX)
+	ret = mtmips_pinctrl_probe(&priv->mp, ARRAY_SIZE(mt7621_pmx_data),
+				   mt7621_pmx_data);
+#endif /* CONFIG_IS_ENABLED(PINMUX) */
+
+	return ret;
+}
+
+static int mt7621_pinctrl_of_to_plat(struct udevice *dev)
+{
+	struct mt7621_pinctrl_priv *priv = dev_get_priv(dev);
+
+	priv->mp.base = (void __iomem *)dev_remap_addr_index(dev, 0);
+
+	if (!priv->mp.base)
+		return -EINVAL;
+
+	return 0;
+}
+
+static const struct pinctrl_ops mt7621_pinctrl_ops = {
+#if CONFIG_IS_ENABLED(PINMUX)
+	.get_groups_count = mt7621_get_groups_count,
+	.get_group_name = mt7621_get_group_name,
+	.get_functions_count = mtmips_get_functions_count,
+	.get_function_name = mtmips_get_function_name,
+	.pinmux_group_set = mtmips_pinmux_group_set,
+#endif /* CONFIG_IS_ENABLED(PINMUX) */
+#if CONFIG_IS_ENABLED(PINCONF)
+	.pinconf_num_params = ARRAY_SIZE(mt7621_conf_params),
+	.pinconf_params = mt7621_conf_params,
+	.pinconf_group_set = mt7621_pinconf_group_set,
+#endif /* CONFIG_IS_ENABLED(PINCONF) */
+	.set_state = pinctrl_generic_set_state,
+};
+
+static const struct udevice_id mt7621_pinctrl_ids[] = {
+	{ .compatible = "mediatek,mt7621-pinctrl" },
+	{ }
+};
+
+U_BOOT_DRIVER(mt7621_pinctrl) = {
+	.name = "mt7621-pinctrl",
+	.id = UCLASS_PINCTRL,
+	.of_match = mt7621_pinctrl_ids,
+	.of_to_plat = mt7621_pinctrl_of_to_plat,
+	.ops = &mt7621_pinctrl_ops,
+	.probe = mt7621_pinctrl_probe,
+	.priv_auto = sizeof(struct mt7621_pinctrl_priv),
+};
diff --git a/drivers/pinctrl/mtmips/pinctrl-mtmips-common.c b/drivers/pinctrl/mtmips/pinctrl-mtmips-common.c
index e361916..869b781 100644
--- a/drivers/pinctrl/mtmips/pinctrl-mtmips-common.c
+++ b/drivers/pinctrl/mtmips/pinctrl-mtmips-common.c
@@ -13,8 +13,8 @@
 
 #include "pinctrl-mtmips-common.h"
 
-static void mtmips_pinctrl_reg_set(struct mtmips_pinctrl_priv *priv,
-				   u32 reg, u32 shift, u32 mask, u32 value)
+void mtmips_pinctrl_reg_set(struct mtmips_pinctrl_priv *priv,
+			    u32 reg, u32 shift, u32 mask, u32 value)
 {
 	u32 val;
 
diff --git a/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h b/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h
index b51d8f0..1f1023e 100644
--- a/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h
+++ b/drivers/pinctrl/mtmips/pinctrl-mtmips-common.h
@@ -22,6 +22,10 @@ struct mtmips_pmx_group {
 	u32 shift;
 	char mask;
 
+	int pconf_avail;
+	u32 pconf_reg;
+	u32 pconf_shift;
+
 	int nfuncs;
 	const struct mtmips_pmx_func *funcs;
 };
@@ -42,6 +46,14 @@ struct mtmips_pinctrl_priv {
 	{ .name = (_name), .reg = (_reg), .shift = (_shift), .mask = (_mask), \
 	  .funcs = (_funcs), .nfuncs = ARRAY_SIZE(_funcs) }
 
+#define GRP_PCONF(_name, _funcs, _reg, _shift, _mask, _pconf_reg, _pconf_shift) \
+	{ .name = (_name), .reg = (_reg), .shift = (_shift), .mask = (_mask), \
+	  .funcs = (_funcs), .nfuncs = ARRAY_SIZE(_funcs), .pconf_avail = 1, \
+	  .pconf_reg = (_pconf_reg), .pconf_shift = (_pconf_shift) }
+
+void mtmips_pinctrl_reg_set(struct mtmips_pinctrl_priv *priv,
+			    u32 reg, u32 shift, u32 mask, u32 value);
+
 int mtmips_get_functions_count(struct udevice *dev);
 const char *mtmips_get_function_name(struct udevice *dev,
 				     unsigned int selector);