mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-28 15:41:40 +00:00
8fd6e64c95
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>
276 lines
6.6 KiB
C
276 lines
6.6 KiB
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,
|
|
};
|