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

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2019 Philippe Reynes <[email protected]>
 *
 * based on:
 * drivers/led/led_bcm6328.c
 * drivers/led/led_bcm6358.c
 */

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