Commit f73f88ac authored by zhanghongchen's avatar zhanghongchen Committed by Linus Walleij
Browse files

pinctrl: pinctrl-loongson2: add pinctrl driver support 



The Loongson-2 SoC has a few pins that can be used as GPIOs or take
multiple other functions. Add a driver for the pinmuxing.

There is currently no support for GPIO pin pull-up and pull-down.

Signed-off-by: default avatarzhanghongchen <zhanghongchen@loongson.cn>
Co-developed-by: default avatarYinbo Zhu <zhuyinbo@loongson.cn>
Signed-off-by: default avatarYinbo Zhu <zhuyinbo@loongson.cn>
Link: https://lore.kernel.org/r/20221114024942.8111-1-zhuyinbo@loongson.cn


Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent da67eff5

drivers/pinctrl/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -258,6 +258,17 @@ config PINCTRL_FALCON 
	depends on SOC_FALCON

	depends on PINCTRL_LANTIQ



config PINCTRL_LOONGSON2

	tristate "Pinctrl driver for the Loongson-2 SoC"

	depends on LOONGARCH || COMPILE_TEST

	select PINMUX

	select GENERIC_PINCONF

	help

	 This selects pin control driver for the Loongson-2 SoC. It

	 provides pin config functions multiplexing.  GPIO pin pull-up,

	 pull-down functions are not supported. Say yes to enable

	 pinctrl for Loongson-2 SoC.



config PINCTRL_XWAY

	bool

	depends on SOC_TYPE_XWAY

drivers/pinctrl/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ obj-$(CONFIG_PINCTRL_K210) += pinctrl-k210.o 
obj-$(CONFIG_PINCTRL_KEEMBAY)	+= pinctrl-keembay.o

obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o

obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o

obj-$(CONFIG_PINCTRL_LOONGSON2) += pinctrl-loongson2.o

obj-$(CONFIG_PINCTRL_XWAY)	+= pinctrl-xway.o

obj-$(CONFIG_PINCTRL_LPC18XX)	+= pinctrl-lpc18xx.o

obj-$(CONFIG_PINCTRL_MAX77620)	+= pinctrl-max77620.o

drivers/pinctrl/pinctrl-loongson2.c

0 → 100644
+311 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * Author: zhanghongchen <zhanghongchen@loongson.cn>

 *         Yinbo Zhu <zhuyinbo@loongson.cn>

 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited

 */



#include <linux/init.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/mod_devicetable.h>

#include <linux/pinctrl/pinmux.h>

#include <linux/pinctrl/pinconf-generic.h>

#include <linux/pinctrl/pinctrl.h>

#include <linux/bitops.h>

#include <linux/io.h>

#include <linux/seq_file.h>



#include "core.h"

#include "pinctrl-utils.h"



#define PMX_GROUP(name, offset, bitv)					\

	{								\

		.grp = PINCTRL_PINGROUP((#name), (name ## _pins),	\

				ARRAY_SIZE((name ## _pins))),		\

		.reg = offset,						\

		.bit = bitv,						\

	}



#define SPECIFIC_GROUP(group)						\

	static const char * const group##_groups[] = {			\

		#group							\

	}



#define FUNCTION(fn)							\

	{								\

		.name = #fn,						\

		.groups = fn ## _groups,				\

		.num_groups = ARRAY_SIZE(fn ## _groups),		\

	}



struct loongson2_pinctrl {

	struct device *dev;

	struct pinctrl_dev *pcdev;

	struct pinctrl_desc desc;

	struct device_node *of_node;

	spinlock_t lock;

	void * __iomem reg_base;

};



struct loongson2_pmx_group {

	struct pingroup grp;

	unsigned int reg;

	unsigned int bit;

};



struct loongson2_pmx_func {

	const char *name;

	const char * const *groups;

	unsigned int num_groups;

};



#define LOONGSON2_PIN(x) PINCTRL_PIN(x, "gpio"#x)

static const struct pinctrl_pin_desc loongson2_pctrl_pins[] = {

	LOONGSON2_PIN(0),  LOONGSON2_PIN(1),  LOONGSON2_PIN(2),  LOONGSON2_PIN(3),

	LOONGSON2_PIN(4),  LOONGSON2_PIN(5),  LOONGSON2_PIN(6),  LOONGSON2_PIN(7),

	LOONGSON2_PIN(8),  LOONGSON2_PIN(9),  LOONGSON2_PIN(10), LOONGSON2_PIN(11),

	LOONGSON2_PIN(12), LOONGSON2_PIN(13), LOONGSON2_PIN(14),

	LOONGSON2_PIN(16), LOONGSON2_PIN(17), LOONGSON2_PIN(18), LOONGSON2_PIN(19),

	LOONGSON2_PIN(20), LOONGSON2_PIN(21), LOONGSON2_PIN(22), LOONGSON2_PIN(23),

	LOONGSON2_PIN(24), LOONGSON2_PIN(25), LOONGSON2_PIN(26), LOONGSON2_PIN(27),

	LOONGSON2_PIN(28), LOONGSON2_PIN(29), LOONGSON2_PIN(30),

	LOONGSON2_PIN(32), LOONGSON2_PIN(33), LOONGSON2_PIN(34), LOONGSON2_PIN(35),

	LOONGSON2_PIN(36), LOONGSON2_PIN(37), LOONGSON2_PIN(38), LOONGSON2_PIN(39),

	LOONGSON2_PIN(40), LOONGSON2_PIN(41),

	LOONGSON2_PIN(44), LOONGSON2_PIN(45), LOONGSON2_PIN(46), LOONGSON2_PIN(47),

	LOONGSON2_PIN(48), LOONGSON2_PIN(49), LOONGSON2_PIN(50), LOONGSON2_PIN(51),

	LOONGSON2_PIN(52), LOONGSON2_PIN(53), LOONGSON2_PIN(54), LOONGSON2_PIN(55),

	LOONGSON2_PIN(56), LOONGSON2_PIN(57), LOONGSON2_PIN(58), LOONGSON2_PIN(59),

	LOONGSON2_PIN(60), LOONGSON2_PIN(61), LOONGSON2_PIN(62), LOONGSON2_PIN(63),

};



static const unsigned int gpio_pins[] = {0, 1, 2, 3, 4, 5, 6, 7,

					 8, 9, 10, 11, 12, 13, 14,

					 16, 17, 18, 19, 20, 21, 22, 23,

					 24, 25, 26, 27, 28, 29, 30,

					 32, 33, 34, 35, 36, 37, 38, 39,

					 40,         43, 44, 45, 46, 47,

					 48, 49, 50, 51, 52, 53, 46, 55,

					 56, 57, 58, 59, 60, 61, 62, 63};

static const unsigned int sdio_pins[] = {36, 37, 38, 39, 40, 41};

static const unsigned int can1_pins[] = {34, 35};

static const unsigned int can0_pins[] = {32, 33};

static const unsigned int pwm3_pins[] = {23};

static const unsigned int pwm2_pins[] = {22};

static const unsigned int pwm1_pins[] = {21};

static const unsigned int pwm0_pins[] = {20};

static const unsigned int i2c1_pins[] = {18, 19};

static const unsigned int i2c0_pins[] = {16, 17};

static const unsigned int nand_pins[] = {44, 45, 46, 47, 48, 49, 50, 51,

					 52, 53, 54, 55, 56, 57, 58, 59, 60,

					 61, 62, 63};

static const unsigned int sata_led_pins[] = {14};

static const unsigned int i2s_pins[]    = {24, 25, 26, 27, 28};

static const unsigned int hda_pins[]    = {24, 25, 26, 27, 28, 29, 30};



static struct loongson2_pmx_group loongson2_pmx_groups[] = {

	PMX_GROUP(gpio, 0x0, 64),

	PMX_GROUP(sdio, 0x0, 20),

	PMX_GROUP(can1, 0x0, 17),

	PMX_GROUP(can0, 0x0, 16),

	PMX_GROUP(pwm3, 0x0, 15),

	PMX_GROUP(pwm2, 0x0, 14),

	PMX_GROUP(pwm1, 0x0, 13),

	PMX_GROUP(pwm0, 0x0, 12),

	PMX_GROUP(i2c1, 0x0, 11),

	PMX_GROUP(i2c0, 0x0, 10),

	PMX_GROUP(nand, 0x0, 9),

	PMX_GROUP(sata_led, 0x0, 8),

	PMX_GROUP(i2s, 0x0, 6),

	PMX_GROUP(hda, 0x0, 4),

};



SPECIFIC_GROUP(sdio);

SPECIFIC_GROUP(can1);

SPECIFIC_GROUP(can0);

SPECIFIC_GROUP(pwm3);

SPECIFIC_GROUP(pwm2);

SPECIFIC_GROUP(pwm1);

SPECIFIC_GROUP(pwm0);

SPECIFIC_GROUP(i2c1);

SPECIFIC_GROUP(i2c0);

SPECIFIC_GROUP(nand);

SPECIFIC_GROUP(sata_led);

SPECIFIC_GROUP(i2s);

SPECIFIC_GROUP(hda);



static const char * const gpio_groups[] = {

	"sdio",

	"can1", "can0",

	"pwm3", "pwm2", "pwm1", "pwm0",

	"i2c1", "i2c0",

	"nand",

	"sata_led",

	"i2s",

	"hda",

};



static const struct loongson2_pmx_func loongson2_pmx_functions[] = {

	FUNCTION(gpio),

	FUNCTION(sdio),

	FUNCTION(can1),

	FUNCTION(can0),

	FUNCTION(pwm3),

	FUNCTION(pwm2),

	FUNCTION(pwm1),

	FUNCTION(pwm0),

	FUNCTION(i2c1),

	FUNCTION(i2c0),

	FUNCTION(nand),

	FUNCTION(sata_led),

	FUNCTION(i2s),

	FUNCTION(hda),

};



static int loongson2_get_groups_count(struct pinctrl_dev *pcdev)

{

	return ARRAY_SIZE(loongson2_pmx_groups);

}



static const char *loongson2_get_group_name(struct pinctrl_dev *pcdev,

					unsigned int selector)

{

	return loongson2_pmx_groups[selector].grp.name;

}



static int loongson2_get_group_pins(struct pinctrl_dev *pcdev, unsigned int selector,

			const unsigned int **pins, unsigned int *num_pins)

{

	*pins = loongson2_pmx_groups[selector].grp.pins;

	*num_pins = loongson2_pmx_groups[selector].grp.npins;



	return 0;

}



static void loongson2_pin_dbg_show(struct pinctrl_dev *pcdev, struct seq_file *s,

			       unsigned int offset)

{

	seq_printf(s, " %s", dev_name(pcdev->dev));

}



static const struct pinctrl_ops loongson2_pctrl_ops = {

	.get_groups_count	= loongson2_get_groups_count,

	.get_group_name		= loongson2_get_group_name,

	.get_group_pins		= loongson2_get_group_pins,

	.dt_node_to_map		= pinconf_generic_dt_node_to_map_all,

	.dt_free_map		= pinctrl_utils_free_map,

	.pin_dbg_show		= loongson2_pin_dbg_show,

};



static int loongson2_pmx_set_mux(struct pinctrl_dev *pcdev, unsigned int func_num,

			      unsigned int group_num)

{

	struct loongson2_pinctrl *pctrl = pinctrl_dev_get_drvdata(pcdev);

	void * __iomem reg = pctrl->reg_base +

				loongson2_pmx_groups[group_num].reg;

	unsigned int mux_bit = loongson2_pmx_groups[group_num].bit;

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&pctrl->lock, flags);

	val = readl(reg);

	if (func_num == 0)

		val &= ~BIT(mux_bit);

	else

		val |= BIT(mux_bit);

	writel(val, reg);

	spin_unlock_irqrestore(&pctrl->lock, flags);



	return 0;

}



static int loongson2_pmx_get_funcs_count(struct pinctrl_dev *pcdev)

{

	return ARRAY_SIZE(loongson2_pmx_functions);

}



static const char *loongson2_pmx_get_func_name(struct pinctrl_dev *pcdev,

				    unsigned int selector)

{

	return loongson2_pmx_functions[selector].name;

}



static int loongson2_pmx_get_groups(struct pinctrl_dev *pcdev,

			 unsigned int selector,

			 const char * const **groups,

			 unsigned int * const num_groups)

{

	*groups = loongson2_pmx_functions[selector].groups;

	*num_groups = loongson2_pmx_functions[selector].num_groups;



	return 0;

}



static const struct pinmux_ops loongson2_pmx_ops = {

	.set_mux = loongson2_pmx_set_mux,

	.get_functions_count = loongson2_pmx_get_funcs_count,

	.get_function_name = loongson2_pmx_get_func_name,

	.get_function_groups = loongson2_pmx_get_groups,

};



static int loongson2_pinctrl_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct loongson2_pinctrl *pctrl;



	pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);

	if (!pctrl)

		return -ENOMEM;



	pctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);

	if (IS_ERR(pctrl->reg_base))

		return PTR_ERR(pctrl->reg_base);



	spin_lock_init(&pctrl->lock);



	pctrl->dev = dev;

	pctrl->desc.name	= "pinctrl-loongson2";

	pctrl->desc.owner	= THIS_MODULE;

	pctrl->desc.pctlops	= &loongson2_pctrl_ops;

	pctrl->desc.pmxops	= &loongson2_pmx_ops;

	pctrl->desc.pins	= loongson2_pctrl_pins;

	pctrl->desc.npins	= ARRAY_SIZE(loongson2_pctrl_pins);



	pctrl->pcdev = devm_pinctrl_register(pctrl->dev, &pctrl->desc, pctrl);

	if (IS_ERR(pctrl->pcdev))

		return dev_err_probe(pctrl->dev, PTR_ERR(pctrl->pcdev),

				     "can't register pinctrl device");



	return 0;

}



static const struct of_device_id loongson2_pinctrl_dt_match[] = {

	{

		.compatible = "loongson,ls2k-pinctrl",

	},

	{ }

};



static struct platform_driver loongson2_pinctrl_driver = {

	.probe		= loongson2_pinctrl_probe,

	.driver = {

		.name	= "loongson2-pinctrl",

		.of_match_table = loongson2_pinctrl_dt_match,

	},

};



static int __init loongson2_pinctrl_init(void)

{

	return platform_driver_register(&loongson2_pinctrl_driver);

}

arch_initcall(loongson2_pinctrl_init);



static void __exit loongson2_pinctrl_exit(void)

{

	platform_driver_unregister(&loongson2_pinctrl_driver);

}

module_exit(loongson2_pinctrl_exit);



MODULE_DESCRIPTION("Loongson2 Pinctrl driver");

MODULE_LICENSE("GPL");