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// 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,
};
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