drivers/led/led_bcm6858.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2019 Philippe Reynes <philippe.reynes@softathome.com>
  *
  * based on:
  * drivers/led/led_bcm6328.c
  * drivers/led/led_bcm6358.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
 #define LEDS_MAX_BRIGHTNESS	7

 /* 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 LED_CTRL_REG			0x00
 #define LED_CTRL_MASK			0x1f
 #define LED_CTRL_LED_TEST_MODE		BIT(0)
 #define LED_CTRL_SERIAL_LED_DATA_PPOL	BIT(1)
 #define LED_CTRL_SERIAL_LED_CLK_POL	BIT(2)
 #define LED_CTRL_SERIAL_LED_EN_POL	BIT(3)
 #define LED_CTRL_SERIAL_LED_MSB_FIRST	BIT(4)

 /* LED Controller IP LED source select register */
 #define LED_HW_LED_EN_REG		0x08
 /* LED Flash control register0 */
 #define LED_FLASH_RATE_CONTROL_REG0	0x10
 /* LED Brightness control register0 */
 #define LED_BRIGHTNESS_CONTROL_REG0	0x20
 /* Soft LED input register */
 #define LED_SW_LED_IP_REG		0xb8
 /* Parallel LED Output Polarity Register */
 #define LED_PLED_OP_PPOL_REG		0xc0

 struct bcm6858_led_priv {
 	void __iomem *regs;
 	u8 pin;
 };

 #ifdef CONFIG_LED_BLINK
 /*
  * 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 bcm6858_flash_rate[8] = {
 	0, 40, 80, 160, 320, 640, 1280, 2560
 };

 static u32 bcm6858_flash_rate_value(int period_ms)
 {
 	unsigned long value = 7;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(bcm6858_flash_rate); i++) {
 		if (period_ms <= bcm6858_flash_rate[i]) {
 			value = i;
 			break;
 		}
 	}

 	return value;
 }

 static int bcm6858_led_set_period(struct udevice *dev, int period_ms)
 {
 	struct bcm6858_led_priv *priv = dev_get_priv(dev);
 	u32 offset, shift, mask, value;

 	offset = (priv->pin / 8) * 4;
 	shift  = (priv->pin % 8) * 4;
 	mask   = 0x7 << shift;
 	value  = bcm6858_flash_rate_value(period_ms) << shift;

 	clrbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, mask);
 	setbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, value);

 	return 0;
 }
 #endif

 static int led_set_brightness(struct udevice *dev, unsigned int brightness)
 {
 	struct bcm6858_led_priv *priv = dev_get_priv(dev);
 	u32 offset, shift, mask, value;

 	offset = (priv->pin / 8) * 4;
 	shift  = (priv->pin % 8) * 4;
 	mask   = 0xf << shift;

 	/* 8 levels of brightness achieved through PWM */
 	value = (brightness > LEDS_MAX_BRIGHTNESS ?
 			LEDS_MAX_BRIGHTNESS : brightness) << shift;

 	debug("%s: %s brightness set to %u\n", __func__, dev->name, value >> shift);

 	clrbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, mask);
 	setbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, value);

 	return 0;
 }

 static enum led_state_t bcm6858_led_get_state(struct udevice *dev)
 {
 	struct bcm6858_led_priv *priv = dev_get_priv(dev);
 	enum led_state_t state = LEDST_OFF;
 	u32 sw_led_ip;

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

 	return state;
 }

 static int bcm6858_led_set_state(struct udevice *dev, enum led_state_t state)
 {
 	struct bcm6858_led_priv *priv = dev_get_priv(dev);

 	debug("%s: Set led %s to %d\n", __func__, dev->name, state);

 	switch (state) {
 	case LEDST_OFF:
 		clrbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
 #ifdef CONFIG_LED_BLINK
 		bcm6858_led_set_period(dev, 0);
 #endif
 		break;
 	case LEDST_ON:
 		setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
 #ifdef CONFIG_LED_BLINK
 		bcm6858_led_set_period(dev, 0);
 #endif
 		break;
 	case LEDST_TOGGLE:
 		if (bcm6858_led_get_state(dev) == LEDST_OFF)
 			return bcm6858_led_set_state(dev, LEDST_ON);
 		else
 			return bcm6858_led_set_state(dev, LEDST_OFF);
 		break;
 #ifdef CONFIG_LED_BLINK
 	case LEDST_BLINK:
 		setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
 		break;
 #endif
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static const struct led_ops bcm6858_led_ops = {
 	.get_state = bcm6858_led_get_state,
 	.set_state = bcm6858_led_set_state,
 #ifdef CONFIG_LED_BLINK
 	.set_period = bcm6858_led_set_period,
 #endif
 };

 static int bcm6858_led_probe(struct udevice *dev)
 {
 	struct bcm6858_led_priv *priv = dev_get_priv(dev);
 	void __iomem *regs;
 	unsigned int pin, brightness;

 	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 + LED_HW_LED_EN_REG, 1 << pin);

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

 	brightness = dev_read_u32_default(dev, "default-brightness",
 						  LEDS_MAX_BRIGHTNESS);
 	led_set_brightness(dev, brightness);

 	return 0;
 }

 U_BOOT_DRIVER(bcm6858_led) = {
 	.name = "bcm6858-led",
 	.id = UCLASS_LED,
 	.probe = bcm6858_led_probe,
 	.priv_auto	= sizeof(struct bcm6858_led_priv),
 	.ops = &bcm6858_led_ops,
 };

 static int bcm6858_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 |= LED_CTRL_SERIAL_LED_MSB_FIRST;
 	if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
 		set_bits |= LED_CTRL_SERIAL_LED_EN_POL;
 	if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
 		set_bits |= LED_CTRL_SERIAL_LED_CLK_POL;
 	if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
 		set_bits |= LED_CTRL_SERIAL_LED_DATA_PPOL;
 	if (dev_read_bool(dev, "brcm,led-test-mode"))
 		set_bits |= LED_CTRL_LED_TEST_MODE;

 	clrsetbits_32(regs + LED_CTRL_REG, ~0, set_bits);

 	return 0;
 }

 static int bcm6858_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, "bcm6858-led",
 						 ofnode_get_name(node),
 						 node, &dev);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static const struct udevice_id bcm6858_led_ids[] = {
 	{ .compatible = "brcm,bcm6858-leds" },
 	{ /* sentinel */ }
 };

 U_BOOT_DRIVER(bcm6858_led_wrap) = {
 	.name	= "bcm6858_led_wrap",
 	.id	= UCLASS_NOP,
 	.of_match = bcm6858_led_ids,
 	.probe = bcm6858_led_wrap_probe,
 	.bind = bcm6858_led_wrap_bind,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2019 Philippe Reynes <philippe.reynes@softathome.com>
	*
	* based on:
	* drivers/led/led_bcm6328.c
	* drivers/led/led_bcm6358.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
	#define LEDS_MAX_BRIGHTNESS 7

	/* 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 LED_CTRL_REG 0x00
	#define LED_CTRL_MASK 0x1f
	#define LED_CTRL_LED_TEST_MODE BIT(0)
	#define LED_CTRL_SERIAL_LED_DATA_PPOL BIT(1)
	#define LED_CTRL_SERIAL_LED_CLK_POL BIT(2)
	#define LED_CTRL_SERIAL_LED_EN_POL BIT(3)
	#define LED_CTRL_SERIAL_LED_MSB_FIRST BIT(4)

	/* LED Controller IP LED source select register */
	#define LED_HW_LED_EN_REG 0x08
	/* LED Flash control register0 */
	#define LED_FLASH_RATE_CONTROL_REG0 0x10
	/* LED Brightness control register0 */
	#define LED_BRIGHTNESS_CONTROL_REG0 0x20
	/* Soft LED input register */
	#define LED_SW_LED_IP_REG 0xb8
	/* Parallel LED Output Polarity Register */
	#define LED_PLED_OP_PPOL_REG 0xc0

	struct bcm6858_led_priv {
	void __iomem *regs;
	u8 pin;
	};

	#ifdef CONFIG_LED_BLINK
	/*
	* 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 bcm6858_flash_rate[8] = {
	0, 40, 80, 160, 320, 640, 1280, 2560
	};

	static u32 bcm6858_flash_rate_value(int period_ms)
	{
	unsigned long value = 7;
	int i;

	for (i = 0; i < ARRAY_SIZE(bcm6858_flash_rate); i++) {
	if (period_ms <= bcm6858_flash_rate[i]) {
	value = i;
	break;
	}
	}

	return value;
	}

	static int bcm6858_led_set_period(struct udevice *dev, int period_ms)
	{
	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	u32 offset, shift, mask, value;

	offset = (priv->pin / 8) * 4;
	shift = (priv->pin % 8) * 4;
	mask = 0x7 << shift;
	value = bcm6858_flash_rate_value(period_ms) << shift;

	clrbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, mask);
	setbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, value);

	return 0;
	}
	#endif

	static int led_set_brightness(struct udevice *dev, unsigned int brightness)
	{
	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	u32 offset, shift, mask, value;

	offset = (priv->pin / 8) * 4;
	shift = (priv->pin % 8) * 4;
	mask = 0xf << shift;

	/* 8 levels of brightness achieved through PWM */
	value = (brightness > LEDS_MAX_BRIGHTNESS ?
	LEDS_MAX_BRIGHTNESS : brightness) << shift;

	debug("%s: %s brightness set to %u\n", __func__, dev->name, value >> shift);

	clrbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, mask);
	setbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, value);

	return 0;
	}

	static enum led_state_t bcm6858_led_get_state(struct udevice *dev)
	{
	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	enum led_state_t state = LEDST_OFF;
	u32 sw_led_ip;

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

	return state;
	}

	static int bcm6858_led_set_state(struct udevice *dev, enum led_state_t state)
	{
	struct bcm6858_led_priv *priv = dev_get_priv(dev);

	debug("%s: Set led %s to %d\n", __func__, dev->name, state);

	switch (state) {
	case LEDST_OFF:
	clrbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
	#ifdef CONFIG_LED_BLINK
	bcm6858_led_set_period(dev, 0);
	#endif
	break;
	case LEDST_ON:
	setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
	#ifdef CONFIG_LED_BLINK
	bcm6858_led_set_period(dev, 0);
	#endif
	break;
	case LEDST_TOGGLE:
	if (bcm6858_led_get_state(dev) == LEDST_OFF)
	return bcm6858_led_set_state(dev, LEDST_ON);
	else
	return bcm6858_led_set_state(dev, LEDST_OFF);
	break;
	#ifdef CONFIG_LED_BLINK
	case LEDST_BLINK:
	setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
	break;
	#endif
	default:
	return -EINVAL;
	}

	return 0;
	}

	static const struct led_ops bcm6858_led_ops = {
	.get_state = bcm6858_led_get_state,
	.set_state = bcm6858_led_set_state,
	#ifdef CONFIG_LED_BLINK
	.set_period = bcm6858_led_set_period,
	#endif
	};

	static int bcm6858_led_probe(struct udevice *dev)
	{
	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	void __iomem *regs;
	unsigned int pin, brightness;

	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 + LED_HW_LED_EN_REG, 1 << pin);

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

	brightness = dev_read_u32_default(dev, "default-brightness",
	LEDS_MAX_BRIGHTNESS);
	led_set_brightness(dev, brightness);

	return 0;
	}

	U_BOOT_DRIVER(bcm6858_led) = {
	.name = "bcm6858-led",
	.id = UCLASS_LED,
	.probe = bcm6858_led_probe,
	.priv_auto = sizeof(struct bcm6858_led_priv),
	.ops = &bcm6858_led_ops,
	};

	static int bcm6858_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 \|= LED_CTRL_SERIAL_LED_MSB_FIRST;
	if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
	set_bits \|= LED_CTRL_SERIAL_LED_EN_POL;
	if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
	set_bits \|= LED_CTRL_SERIAL_LED_CLK_POL;
	if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
	set_bits \|= LED_CTRL_SERIAL_LED_DATA_PPOL;
	if (dev_read_bool(dev, "brcm,led-test-mode"))
	set_bits \|= LED_CTRL_LED_TEST_MODE;

	clrsetbits_32(regs + LED_CTRL_REG, ~0, set_bits);

	return 0;
	}

	static int bcm6858_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, "bcm6858-led",
	ofnode_get_name(node),
	node, &dev);
	if (ret)
	return ret;
	}

	return 0;
	}

	static const struct udevice_id bcm6858_led_ids[] = {
	{ .compatible = "brcm,bcm6858-leds" },
	{ /* sentinel */ }
	};

	U_BOOT_DRIVER(bcm6858_led_wrap) = {
	.name = "bcm6858_led_wrap",
	.id = UCLASS_NOP,
	.of_match = bcm6858_led_ids,
	.probe = bcm6858_led_wrap_probe,
	.bind = bcm6858_led_wrap_bind,
	};