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u-boot/drivers/led/led_bcm6858.c
Philippe Reynes 8fd6e64c95 drivers: led: bcm6858: do not use null label to find the top 
This driver considers that a node with an empty label is the top.
But the led class has changed, if a label is not provided for a led,
the label is filed with the node name. So we update this driver
to use a wrapper to manage the top led node.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
2023-07-25 12:44:46 -04:00

277 lines
6.6 KiB
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// 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,
};
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