[thirdparty/u-boot.git] / drivers / led / led_bcm6858.c

// 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,
};
Commit	Line	Data
d00c6a2d PR	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright (C) 2019 Philippe Reynes <philippe.reynes@softathome.com>
	4	*
	5	* based on:
	6	* drivers/led/led_bcm6328.c
	7	* drivers/led/led_bcm6358.c
	8	*/
	9
d678a59d	10	#include <common.h>
d00c6a2d PR	11	#include <dm.h>
	12	#include <errno.h>
	13	#include <led.h>
f7ae49fc	14	#include <log.h>
d00c6a2d PR	15	#include <asm/io.h>
d00c6a2d PR	16	#include <dm/lists.h>
cd93d625	17	#include <linux/bitops.h>
d00c6a2d PR	18
	19	#define LEDS_MAX 32
	20	#define LEDS_WAIT 100
877de2a3	21	#define LEDS_MAX_BRIGHTNESS 7
d00c6a2d PR	22
	23	/* LED Mode register */
	24	#define LED_MODE_REG 0x0
	25	#define LED_MODE_OFF 0
	26	#define LED_MODE_ON 1
	27	#define LED_MODE_MASK 1
	28
	29	/* LED Controller Global settings register */
	30	#define LED_CTRL_REG 0x00
	31	#define LED_CTRL_MASK 0x1f
	32	#define LED_CTRL_LED_TEST_MODE BIT(0)
	33	#define LED_CTRL_SERIAL_LED_DATA_PPOL BIT(1)
	34	#define LED_CTRL_SERIAL_LED_CLK_POL BIT(2)
	35	#define LED_CTRL_SERIAL_LED_EN_POL BIT(3)
	36	#define LED_CTRL_SERIAL_LED_MSB_FIRST BIT(4)
	37
	38	/* LED Controller IP LED source select register */
	39	#define LED_HW_LED_EN_REG 0x08
	40	/* LED Flash control register0 */
	41	#define LED_FLASH_RATE_CONTROL_REG0 0x10
877de2a3 PH	42	/* LED Brightness control register0 */
877de2a3 PH	43	#define LED_BRIGHTNESS_CONTROL_REG0 0x20
d00c6a2d PR	44	/* Soft LED input register */
d00c6a2d PR	45	#define LED_SW_LED_IP_REG 0xb8
e0407253 SL	46	/* Parallel LED Output Polarity Register */
e0407253 SL	47	#define LED_PLED_OP_PPOL_REG 0xc0
d00c6a2d PR	48
	49	struct bcm6858_led_priv {
	50	void __iomem *regs;
	51	u8 pin;
	52	};
	53
	54	#ifdef CONFIG_LED_BLINK
	55	/*
	56	* The value for flash rate are:
	57	* 0 : no blinking
	58	* 1 : rate is 25 Hz => 40 ms (period)
	59	* 2 : rate is 12.5 Hz => 80 ms (period)
	60	* 3 : rate is 6.25 Hz => 160 ms (period)
	61	* 4 : rate is 3.125 Hz => 320 ms (period)
	62	* 5 : rate is 1.5625 Hz => 640 ms (period)
	63	* 6 : rate is 0.7815 Hz => 1280 ms (period)
	64	* 7 : rate is 0.390625 Hz => 2560 ms (period)
	65	*/
	66	static const int bcm6858_flash_rate[8] = {
	67	0, 40, 80, 160, 320, 640, 1280, 2560
	68	};
	69
	70	static u32 bcm6858_flash_rate_value(int period_ms)
	71	{
	72	unsigned long value = 7;
	73	int i;
	74
	75	for (i = 0; i < ARRAY_SIZE(bcm6858_flash_rate); i++) {
	76	if (period_ms <= bcm6858_flash_rate[i]) {
	77	value = i;
	78	break;
	79	}
	80	}
	81
	82	return value;
	83	}
	84
	85	static int bcm6858_led_set_period(struct udevice *dev, int period_ms)
	86	{
	87	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	88	u32 offset, shift, mask, value;
	89
	90	offset = (priv->pin / 8) * 4;
	91	shift = (priv->pin % 8) * 4;
	92	mask = 0x7 << shift;
	93	value = bcm6858_flash_rate_value(period_ms) << shift;
	94
	95	clrbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, mask);
	96	setbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, value);
	97
	98	return 0;
	99	}
	100	#endif
	101
877de2a3 PH	102	static int led_set_brightness(struct udevice *dev, unsigned int brightness)
	103	{
	104	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	105	u32 offset, shift, mask, value;
	106
	107	offset = (priv->pin / 8) * 4;
	108	shift = (priv->pin % 8) * 4;
	109	mask = 0xf << shift;
	110
	111	/* 8 levels of brightness achieved through PWM */
	112	value = (brightness > LEDS_MAX_BRIGHTNESS ?
	113	LEDS_MAX_BRIGHTNESS : brightness) << shift;
	114
	115	debug("%s: %s brightness set to %u\n", __func__, dev->name, value >> shift);
	116
	117	clrbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, mask);
	118	setbits_32(priv->regs + LED_BRIGHTNESS_CONTROL_REG0 + offset, value);
	119
	120	return 0;
	121	}
	122
d00c6a2d PR	123	static enum led_state_t bcm6858_led_get_state(struct udevice *dev)
	124	{
	125	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	126	enum led_state_t state = LEDST_OFF;
	127	u32 sw_led_ip;
	128
	129	sw_led_ip = readl(priv->regs + LED_SW_LED_IP_REG);
	130	if (sw_led_ip & (1 << priv->pin))
	131	state = LEDST_ON;
	132
	133	return state;
	134	}
	135
	136	static int bcm6858_led_set_state(struct udevice *dev, enum led_state_t state)
	137	{
	138	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	139
877de2a3 PH	140	debug("%s: Set led %s to %d\n", __func__, dev->name, state);
877de2a3 PH	141
d00c6a2d PR	142	switch (state) {
	143	case LEDST_OFF:
	144	clrbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
	145	#ifdef CONFIG_LED_BLINK
	146	bcm6858_led_set_period(dev, 0);
	147	#endif
	148	break;
	149	case LEDST_ON:
	150	setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
	151	#ifdef CONFIG_LED_BLINK
	152	bcm6858_led_set_period(dev, 0);
	153	#endif
	154	break;
	155	case LEDST_TOGGLE:
	156	if (bcm6858_led_get_state(dev) == LEDST_OFF)
	157	return bcm6858_led_set_state(dev, LEDST_ON);
	158	else
	159	return bcm6858_led_set_state(dev, LEDST_OFF);
	160	break;
	161	#ifdef CONFIG_LED_BLINK
	162	case LEDST_BLINK:
	163	setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
	164	break;
	165	#endif
	166	default:
	167	return -EINVAL;
	168	}
	169
	170	return 0;
	171	}
	172
	173	static const struct led_ops bcm6858_led_ops = {
	174	.get_state = bcm6858_led_get_state,
	175	.set_state = bcm6858_led_set_state,
	176	#ifdef CONFIG_LED_BLINK
	177	.set_period = bcm6858_led_set_period,
	178	#endif
	179	};
	180
	181	static int bcm6858_led_probe(struct udevice *dev)
	182	{
8fd6e64c PR	183	struct bcm6858_led_priv *priv = dev_get_priv(dev);
	184	void __iomem *regs;
	185	unsigned int pin, brightness;
	186
	187	regs = dev_remap_addr(dev_get_parent(dev));
	188	if (!regs)
	189	return -EINVAL;
	190
	191	pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
	192	if (pin >= LEDS_MAX)
	193	return -EINVAL;
	194
	195	priv->regs = regs;
	196	priv->pin = pin;
	197
	198	/* this led is managed by software */
	199	clrbits_32(regs + LED_HW_LED_EN_REG, 1 << pin);
877de2a3	200
8fd6e64c PR	201	/* configure the polarity */
	202	if (dev_read_bool(dev, "active-low"))
	203	clrbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin);
	204	else
	205	setbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin);
	206
	207	brightness = dev_read_u32_default(dev, "default-brightness",
877de2a3	208	LEDS_MAX_BRIGHTNESS);
8fd6e64c	209	led_set_brightness(dev, brightness);
d00c6a2d PR	210
	211	return 0;
	212	}
	213
8fd6e64c PR	214	U_BOOT_DRIVER(bcm6858_led) = {
	215	.name = "bcm6858-led",
	216	.id = UCLASS_LED,
	217	.probe = bcm6858_led_probe,
	218	.priv_auto = sizeof(struct bcm6858_led_priv),
	219	.ops = &bcm6858_led_ops,
	220	};
	221
	222	static int bcm6858_led_wrap_probe(struct udevice *dev)
	223	{
	224	void __iomem *regs;
	225	u32 set_bits = 0;
	226
	227	regs = dev_remap_addr(dev);
	228	if (!regs)
	229	return -EINVAL;
	230
	231	if (dev_read_bool(dev, "brcm,serial-led-msb-first"))
	232	set_bits \|= LED_CTRL_SERIAL_LED_MSB_FIRST;
	233	if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
	234	set_bits \|= LED_CTRL_SERIAL_LED_EN_POL;
	235	if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
	236	set_bits \|= LED_CTRL_SERIAL_LED_CLK_POL;
	237	if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
	238	set_bits \|= LED_CTRL_SERIAL_LED_DATA_PPOL;
	239	if (dev_read_bool(dev, "brcm,led-test-mode"))
	240	set_bits \|= LED_CTRL_LED_TEST_MODE;
	241
	242	clrsetbits_32(regs + LED_CTRL_REG, ~0, set_bits);
	243
	244	return 0;
	245	}
	246
	247	static int bcm6858_led_wrap_bind(struct udevice *parent)
d00c6a2d PR	248	{
	249	ofnode node;
	250
	251	dev_for_each_subnode(node, parent) {
d00c6a2d	252	struct udevice *dev;
d00c6a2d PR	253	int ret;
d00c6a2d PR	254
d00c6a2d PR	255	ret = device_bind_driver_to_node(parent, "bcm6858-led",
	256	ofnode_get_name(node),
	257	node, &dev);
	258	if (ret)
	259	return ret;
d00c6a2d PR	260	}
	261
	262	return 0;
	263	}
	264
	265	static const struct udevice_id bcm6858_led_ids[] = {
	266	{ .compatible = "brcm,bcm6858-leds" },
	267	{ /* sentinel */ }
	268	};
	269
8fd6e64c PR	270	U_BOOT_DRIVER(bcm6858_led_wrap) = {
	271	.name = "bcm6858_led_wrap",
	272	.id = UCLASS_NOP,
d00c6a2d	273	.of_match = bcm6858_led_ids,
8fd6e64c PR	274	.probe = bcm6858_led_wrap_probe,
8fd6e64c PR	275	.bind = bcm6858_led_wrap_bind,
d00c6a2d	276	};