drivers/led/led_bcm6753.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2022 Philippe Reynes <philippe.reynes@softathome.com>
  *
  * based on:
  * drivers/led/led_bcm6858.c
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <led.h>
 #include <log.h>
 #include <asm/io.h>
 #include <dm/lists.h>
 #include <linux/bitops.h>

 #define LEDS_MAX		32
 #define LEDS_WAIT		100

 /* LED Mode register */
 #define LED_MODE_REG		0x0
 #define LED_MODE_OFF		0
 #define LED_MODE_ON		1
 #define LED_MODE_MASK		1

 /* LED Controller Global settings register */
 #define CLED_CTRL_REG			0x00
 #define CLED_CTRL_SERIAL_LED_DATA_PPOL	BIT(1)
 #define CLED_CTRL_SERIAL_LED_CLK_POL	BIT(2)
 #define CLED_CTRL_SERIAL_LED_EN_POL	BIT(3)
 #define CLED_CTRL_SERIAL_LED_MSB_FIRST	BIT(4)
 #define CLED_CTRL_MASK			0x1E
 /* LED Controller IP LED source select register */
 #define CLED_HW_LED_EN_REG		0x04
 /* Hardware LED Polarity register */
 #define CLED_HW_LED_IP_PPOL_REG		0x0c
 /* Soft LED Set Register */
 #define CLED_SW_LED_IP_SET_REG		0x10
 /* Parallel LED Output Polarity Register */
 #define CLED_PLED_OP_PPOL_REG		0x18
 /* LED Channel activate register */
 #define CLED_LED_CH_ACTIVATE_REG	0x1c
 /* LED 0 Config 0 reg */
 #define CLED_LED_0_CONFIG_0		0x20
 /* Soft LED Clear Register */
 #define CLED_SW_LED_IP_CLEAR_REG	0x444
 /* Soft LED Status Register */
 #define CLED_SW_LED_IP_STATUS_REG	0x448

 /* Size of all registers used for the config of one LED */
 #define CLED_CONFIG_SIZE		(4 * sizeof(u32))

 #define CLED_CONFIG0_MODE		0
 #define CLED_CONFIG0_MODE_MASK		(BIT(0) | BIT(1))
 #define CLED_CONFIG0_MODE_STEADY	0
 #define CLED_CONFIG0_MODE_FADING	1
 #define CLED_CONFIG0_MODE_PULSATING	2

 #define CLED_CONFIG0_FLASH_CTRL_SHIFT	3
 #define CLED_CONFIG0_FLASH_CTRL_MASK	(BIT(3) | BIT(4) | BIT(5))

 struct bcm6753_led_priv {
 	void __iomem *regs;
 	u8 pin;
 };

 /*
  * The value for flash rate are:
  * 0 : no blinking
  * 1 : rate is 25 Hz => 40 ms (period)
  * 2 : rate is 12.5 Hz => 80 ms (period)
  * 3 : rate is 6.25 Hz => 160 ms (period)
  * 4 : rate is 3.125 Hz => 320 ms (period)
  * 5 : rate is 1.5625 Hz => 640 ms (period)
  * 6 : rate is 0.7815 Hz => 1280 ms (period)
  * 7 : rate is 0.390625 Hz => 2560 ms (period)
  */
 static const int bcm6753_flash_rate[8] = {
 	0, 40, 80, 160, 320, 640, 1280, 2560
 };

 static u32 bcm6753_flash_rate_value(int period_ms)
 {
 	unsigned long value = 7;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(bcm6753_flash_rate); i++) {
 		if (period_ms <= bcm6753_flash_rate[i]) {
 			value = i;
 			break;
 		}
 	}

 	return value;
 }

 static int bcm6753_led_set_period(struct udevice *dev, int period_ms)
 {
 	struct bcm6753_led_priv *priv = dev_get_priv(dev);
 	u32 offset, shift, value;

 	offset = CLED_LED_0_CONFIG_0 + (CLED_CONFIG_SIZE * priv->pin);
 	value  = bcm6753_flash_rate_value(period_ms);
 	shift  = CLED_CONFIG0_FLASH_CTRL_SHIFT;

 	/* set mode steady */
 	clrbits_32(priv->regs + offset, CLED_CONFIG0_MODE_MASK);
 	setbits_32(priv->regs + offset, CLED_CONFIG0_MODE_STEADY);

 	/* set flash rate */
 	clrbits_32(priv->regs + offset, CLED_CONFIG0_FLASH_CTRL_MASK);
 	setbits_32(priv->regs + offset, value << shift);

 	/* enable config */
 	setbits_32(priv->regs + CLED_LED_CH_ACTIVATE_REG, 1 << priv->pin);

 	return 0;
 }

 static enum led_state_t bcm6753_led_get_state(struct udevice *dev)
 {
 	struct bcm6753_led_priv *priv = dev_get_priv(dev);
 	enum led_state_t state = LEDST_OFF;
 	u32 sw_led_ip_status;

 	sw_led_ip_status = readl(priv->regs + CLED_SW_LED_IP_STATUS_REG);
 	if (sw_led_ip_status & (1 << priv->pin))
 		state = LEDST_ON;

 	return state;
 }

 static int bcm6753_led_set_state(struct udevice *dev, enum led_state_t state)
 {
 	struct bcm6753_led_priv *priv = dev_get_priv(dev);

 	switch (state) {
 	case LEDST_OFF:
 		setbits_32(priv->regs + CLED_SW_LED_IP_CLEAR_REG, (1 << priv->pin));
 		if (IS_ENABLED(CONFIG_LED_BLINK))
 			bcm6753_led_set_period(dev, 0);
 		break;
 	case LEDST_ON:
 		setbits_32(priv->regs + CLED_SW_LED_IP_SET_REG, (1 << priv->pin));
 		if (IS_ENABLED(CONFIG_LED_BLINK))
 			bcm6753_led_set_period(dev, 0);
 		break;
 	case LEDST_TOGGLE:
 		if (bcm6753_led_get_state(dev) == LEDST_OFF)
 			return bcm6753_led_set_state(dev, LEDST_ON);
 		else
 			return bcm6753_led_set_state(dev, LEDST_OFF);
 		break;
 #ifdef CONFIG_LED_BLINK
 	case LEDST_BLINK:
 		setbits_32(priv->regs + CLED_SW_LED_IP_SET_REG, (1 << priv->pin));
 		break;
 #endif
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static const struct led_ops bcm6753_led_ops = {
 	.get_state = bcm6753_led_get_state,
 	.set_state = bcm6753_led_set_state,
 #ifdef CONFIG_LED_BLINK
 	.set_period = bcm6753_led_set_period,
 #endif
 };

 static int bcm6753_led_probe(struct udevice *dev)
 {
 	struct bcm6753_led_priv *priv = dev_get_priv(dev);
 	void __iomem *regs;
 	unsigned int pin;

 	regs = dev_remap_addr(dev_get_parent(dev));
 	if (!regs)
 		return -EINVAL;

 	pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
 	if (pin >= LEDS_MAX)
 		return -EINVAL;

 	priv->regs = regs;
 	priv->pin = pin;

 	/* this led is managed by software */
 	clrbits_32(regs + CLED_HW_LED_EN_REG, 1 << pin);

 	/* configure the polarity */
 	if (dev_read_bool(dev, "active-low"))
 		clrbits_32(regs + CLED_PLED_OP_PPOL_REG, 1 << pin);
 	else
 		setbits_32(regs + CLED_PLED_OP_PPOL_REG, 1 << pin);

 	return 0;
 }

 U_BOOT_DRIVER(bcm6753_led) = {
 	.name = "bcm6753-led",
 	.id = UCLASS_LED,
 	.probe = bcm6753_led_probe,
 	.priv_auto = sizeof(struct bcm6753_led_priv),
 	.ops = &bcm6753_led_ops,
 };

 static int bcm6753_led_wrap_probe(struct udevice *dev)
 {
 	void __iomem *regs;
 	u32 set_bits = 0;

 	regs = dev_remap_addr(dev);
 	if (!regs)
 		return -EINVAL;

 	if (dev_read_bool(dev, "brcm,serial-led-msb-first"))
 		set_bits |= CLED_CTRL_SERIAL_LED_MSB_FIRST;
 	if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
 		set_bits |= CLED_CTRL_SERIAL_LED_EN_POL;
 	if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
 		set_bits |= CLED_CTRL_SERIAL_LED_CLK_POL;
 	if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
 		set_bits |= CLED_CTRL_SERIAL_LED_DATA_PPOL;

 	clrsetbits_32(regs + CLED_CTRL_REG, CLED_CTRL_MASK, set_bits);

 	return 0;
 }

 static int bcm6753_led_wrap_bind(struct udevice *parent)
 {
 	ofnode node;

 	dev_for_each_subnode(node, parent) {
 		struct udevice *dev;
 		int ret;

 		ret = device_bind_driver_to_node(parent, "bcm6753-led",
 						 ofnode_get_name(node),
 						 node, &dev);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static const struct udevice_id bcm6753_led_ids[] = {
 	{ .compatible = "brcm,bcm6753-leds" },
 	{ /* sentinel */ }
 };

 U_BOOT_DRIVER(bcm6753_led_wrap) = {
 	.name	= "bcm6753_led_wrap",
 	.id	= UCLASS_NOP,
 	.of_match = bcm6753_led_ids,
 	.probe = bcm6753_led_wrap_probe,
 	.bind = bcm6753_led_wrap_bind,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2022 Philippe Reynes <philippe.reynes@softathome.com>
	*
	* based on:
	* drivers/led/led_bcm6858.c
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <led.h>
	#include <log.h>
	#include <asm/io.h>
	#include <dm/lists.h>
	#include <linux/bitops.h>

	#define LEDS_MAX 32
	#define LEDS_WAIT 100

	/* LED Mode register */
	#define LED_MODE_REG 0x0
	#define LED_MODE_OFF 0
	#define LED_MODE_ON 1
	#define LED_MODE_MASK 1

	/* LED Controller Global settings register */
	#define CLED_CTRL_REG 0x00
	#define CLED_CTRL_SERIAL_LED_DATA_PPOL BIT(1)
	#define CLED_CTRL_SERIAL_LED_CLK_POL BIT(2)
	#define CLED_CTRL_SERIAL_LED_EN_POL BIT(3)
	#define CLED_CTRL_SERIAL_LED_MSB_FIRST BIT(4)
	#define CLED_CTRL_MASK 0x1E
	/* LED Controller IP LED source select register */
	#define CLED_HW_LED_EN_REG 0x04
	/* Hardware LED Polarity register */
	#define CLED_HW_LED_IP_PPOL_REG 0x0c
	/* Soft LED Set Register */
	#define CLED_SW_LED_IP_SET_REG 0x10
	/* Parallel LED Output Polarity Register */
	#define CLED_PLED_OP_PPOL_REG 0x18
	/* LED Channel activate register */
	#define CLED_LED_CH_ACTIVATE_REG 0x1c
	/* LED 0 Config 0 reg */
	#define CLED_LED_0_CONFIG_0 0x20
	/* Soft LED Clear Register */
	#define CLED_SW_LED_IP_CLEAR_REG 0x444
	/* Soft LED Status Register */
	#define CLED_SW_LED_IP_STATUS_REG 0x448

	/* Size of all registers used for the config of one LED */
	#define CLED_CONFIG_SIZE (4 * sizeof(u32))

	#define CLED_CONFIG0_MODE 0
	#define CLED_CONFIG0_MODE_MASK (BIT(0) \| BIT(1))
	#define CLED_CONFIG0_MODE_STEADY 0
	#define CLED_CONFIG0_MODE_FADING 1
	#define CLED_CONFIG0_MODE_PULSATING 2

	#define CLED_CONFIG0_FLASH_CTRL_SHIFT 3
	#define CLED_CONFIG0_FLASH_CTRL_MASK (BIT(3) \| BIT(4) \| BIT(5))

	struct bcm6753_led_priv {
	void __iomem *regs;
	u8 pin;
	};

	/*
	* The value for flash rate are:
	* 0 : no blinking
	* 1 : rate is 25 Hz => 40 ms (period)
	* 2 : rate is 12.5 Hz => 80 ms (period)
	* 3 : rate is 6.25 Hz => 160 ms (period)
	* 4 : rate is 3.125 Hz => 320 ms (period)
	* 5 : rate is 1.5625 Hz => 640 ms (period)
	* 6 : rate is 0.7815 Hz => 1280 ms (period)
	* 7 : rate is 0.390625 Hz => 2560 ms (period)
	*/
	static const int bcm6753_flash_rate[8] = {
	0, 40, 80, 160, 320, 640, 1280, 2560
	};

	static u32 bcm6753_flash_rate_value(int period_ms)
	{
	unsigned long value = 7;
	int i;

	for (i = 0; i < ARRAY_SIZE(bcm6753_flash_rate); i++) {
	if (period_ms <= bcm6753_flash_rate[i]) {
	value = i;
	break;
	}
	}

	return value;
	}

	static int bcm6753_led_set_period(struct udevice *dev, int period_ms)
	{
	struct bcm6753_led_priv *priv = dev_get_priv(dev);
	u32 offset, shift, value;

	offset = CLED_LED_0_CONFIG_0 + (CLED_CONFIG_SIZE * priv->pin);
	value = bcm6753_flash_rate_value(period_ms);
	shift = CLED_CONFIG0_FLASH_CTRL_SHIFT;

	/* set mode steady */
	clrbits_32(priv->regs + offset, CLED_CONFIG0_MODE_MASK);
	setbits_32(priv->regs + offset, CLED_CONFIG0_MODE_STEADY);

	/* set flash rate */
	clrbits_32(priv->regs + offset, CLED_CONFIG0_FLASH_CTRL_MASK);
	setbits_32(priv->regs + offset, value << shift);

	/* enable config */
	setbits_32(priv->regs + CLED_LED_CH_ACTIVATE_REG, 1 << priv->pin);

	return 0;
	}

	static enum led_state_t bcm6753_led_get_state(struct udevice *dev)
	{
	struct bcm6753_led_priv *priv = dev_get_priv(dev);
	enum led_state_t state = LEDST_OFF;
	u32 sw_led_ip_status;

	sw_led_ip_status = readl(priv->regs + CLED_SW_LED_IP_STATUS_REG);
	if (sw_led_ip_status & (1 << priv->pin))
	state = LEDST_ON;

	return state;
	}

	static int bcm6753_led_set_state(struct udevice *dev, enum led_state_t state)
	{
	struct bcm6753_led_priv *priv = dev_get_priv(dev);

	switch (state) {
	case LEDST_OFF:
	setbits_32(priv->regs + CLED_SW_LED_IP_CLEAR_REG, (1 << priv->pin));
	if (IS_ENABLED(CONFIG_LED_BLINK))
	bcm6753_led_set_period(dev, 0);
	break;
	case LEDST_ON:
	setbits_32(priv->regs + CLED_SW_LED_IP_SET_REG, (1 << priv->pin));
	if (IS_ENABLED(CONFIG_LED_BLINK))
	bcm6753_led_set_period(dev, 0);
	break;
	case LEDST_TOGGLE:
	if (bcm6753_led_get_state(dev) == LEDST_OFF)
	return bcm6753_led_set_state(dev, LEDST_ON);
	else
	return bcm6753_led_set_state(dev, LEDST_OFF);
	break;
	#ifdef CONFIG_LED_BLINK
	case LEDST_BLINK:
	setbits_32(priv->regs + CLED_SW_LED_IP_SET_REG, (1 << priv->pin));
	break;
	#endif
	default:
	return -EINVAL;
	}

	return 0;
	}

	static const struct led_ops bcm6753_led_ops = {
	.get_state = bcm6753_led_get_state,
	.set_state = bcm6753_led_set_state,
	#ifdef CONFIG_LED_BLINK
	.set_period = bcm6753_led_set_period,
	#endif
	};

	static int bcm6753_led_probe(struct udevice *dev)
	{
	struct bcm6753_led_priv *priv = dev_get_priv(dev);
	void __iomem *regs;
	unsigned int pin;

	regs = dev_remap_addr(dev_get_parent(dev));
	if (!regs)
	return -EINVAL;

	pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
	if (pin >= LEDS_MAX)
	return -EINVAL;

	priv->regs = regs;
	priv->pin = pin;

	/* this led is managed by software */
	clrbits_32(regs + CLED_HW_LED_EN_REG, 1 << pin);

	/* configure the polarity */
	if (dev_read_bool(dev, "active-low"))
	clrbits_32(regs + CLED_PLED_OP_PPOL_REG, 1 << pin);
	else
	setbits_32(regs + CLED_PLED_OP_PPOL_REG, 1 << pin);

	return 0;
	}

	U_BOOT_DRIVER(bcm6753_led) = {
	.name = "bcm6753-led",
	.id = UCLASS_LED,
	.probe = bcm6753_led_probe,
	.priv_auto = sizeof(struct bcm6753_led_priv),
	.ops = &bcm6753_led_ops,
	};

	static int bcm6753_led_wrap_probe(struct udevice *dev)
	{
	void __iomem *regs;
	u32 set_bits = 0;

	regs = dev_remap_addr(dev);
	if (!regs)
	return -EINVAL;

	if (dev_read_bool(dev, "brcm,serial-led-msb-first"))
	set_bits \|= CLED_CTRL_SERIAL_LED_MSB_FIRST;
	if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
	set_bits \|= CLED_CTRL_SERIAL_LED_EN_POL;
	if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
	set_bits \|= CLED_CTRL_SERIAL_LED_CLK_POL;
	if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
	set_bits \|= CLED_CTRL_SERIAL_LED_DATA_PPOL;

	clrsetbits_32(regs + CLED_CTRL_REG, CLED_CTRL_MASK, set_bits);

	return 0;
	}

	static int bcm6753_led_wrap_bind(struct udevice *parent)
	{
	ofnode node;

	dev_for_each_subnode(node, parent) {
	struct udevice *dev;
	int ret;

	ret = device_bind_driver_to_node(parent, "bcm6753-led",
	ofnode_get_name(node),
	node, &dev);
	if (ret)
	return ret;
	}

	return 0;
	}

	static const struct udevice_id bcm6753_led_ids[] = {
	{ .compatible = "brcm,bcm6753-leds" },
	{ /* sentinel */ }
	};

	U_BOOT_DRIVER(bcm6753_led_wrap) = {
	.name = "bcm6753_led_wrap",
	.id = UCLASS_NOP,
	.of_match = bcm6753_led_ids,
	.probe = bcm6753_led_wrap_probe,
	.bind = bcm6753_led_wrap_bind,
	};