led_bcm6358.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <led.h>
#include <asm/io.h>
#include <dm/lists.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 Control register */
#define LED_CTRL_REG 0x4
#define LED_CTRL_CLK_MASK 0x3
#define LED_CTRL_CLK_1 0
#define LED_CTRL_CLK_2 1
#define LED_CTRL_CLK_4 2
#define LED_CTRL_CLK_8 3
#define LED_CTRL_POL_SHIFT 2
#define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
#define LED_CTRL_BUSY_SHIFT 3
#define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
struct bcm6358_led_priv {
void __iomem *regs;
uint8_t pin;
bool active_low;
};
static void bcm6358_led_busy(void __iomem *regs)
{
while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
udelay(LEDS_WAIT);
}
static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
{
bcm6358_led_busy(priv->regs);
return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
LED_MODE_MASK;
}
static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
{
bcm6358_led_busy(priv->regs);
clrsetbits_be32(priv->regs + LED_MODE_REG,
(LED_MODE_MASK << priv->pin),
(mode << priv->pin));
return 0;
}
static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
{
struct bcm6358_led_priv *priv = dev_get_priv(dev);
enum led_state_t state = LEDST_OFF;
switch (bcm6358_led_get_mode(priv)) {
case LED_MODE_OFF:
state = (priv->active_low ? LEDST_ON : LEDST_OFF);
break;
case LED_MODE_ON:
state = (priv->active_low ? LEDST_OFF : LEDST_ON);
break;
}
return state;
}
static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
{
struct bcm6358_led_priv *priv = dev_get_priv(dev);
unsigned long mode;
switch (state) {
case LEDST_OFF:
mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
break;
case LEDST_ON:
mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
break;
case LEDST_TOGGLE:
if (bcm6358_led_get_state(dev) == LEDST_OFF)
return bcm6358_led_set_state(dev, LEDST_ON);
else
return bcm6358_led_set_state(dev, LEDST_OFF);
break;
default:
return -ENOSYS;
}
return bcm6358_led_set_mode(priv, mode);
}
static const struct led_ops bcm6358_led_ops = {
.get_state = bcm6358_led_get_state,
.set_state = bcm6358_led_set_state,
};
static int bcm6358_led_probe(struct udevice *dev)
{
struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
/* Top-level LED node */
if (!uc_plat->label) {
void __iomem *regs;
unsigned int clk_div;
u32 set_bits = 0;
regs = dev_remap_addr(dev);
if (!regs)
return -EINVAL;
if (dev_read_bool(dev, "brcm,clk-dat-low"))
set_bits |= LED_CTRL_POL_MASK;
clk_div = dev_read_u32_default(dev, "brcm,clk-div",
LED_CTRL_CLK_1);
switch (clk_div) {
case 8:
set_bits |= LED_CTRL_CLK_8;
break;
case 4:
set_bits |= LED_CTRL_CLK_4;
break;
case 2:
set_bits |= LED_CTRL_CLK_2;
break;
default:
set_bits |= LED_CTRL_CLK_1;
break;
}
bcm6358_led_busy(regs);
clrsetbits_be32(regs + LED_CTRL_REG,
LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
set_bits);
} else {
struct bcm6358_led_priv *priv = dev_get_priv(dev);
unsigned int pin;
priv->regs = dev_remap_addr(dev);
if (!priv->regs)
return -EINVAL;
pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
if (pin >= LEDS_MAX)
return -EINVAL;
priv->pin = pin;
if (dev_read_bool(dev, "active-low"))
priv->active_low = true;
}
return 0;
}
static int bcm6358_led_bind(struct udevice *parent)
{
ofnode node;
dev_for_each_subnode(node, parent) {
struct led_uc_plat *uc_plat;
struct udevice *dev;
const char *label;
int ret;
label = ofnode_read_string(node, "label");
if (!label) {
debug("%s: node %s has no label\n", __func__,
ofnode_get_name(node));
return -EINVAL;
}
ret = device_bind_driver_to_node(parent, "bcm6358-led",
ofnode_get_name(node),
node, &dev);
if (ret)
return ret;
uc_plat = dev_get_uclass_platdata(dev);
uc_plat->label = label;
}
return 0;
}
static const struct udevice_id bcm6358_led_ids[] = {
{ .compatible = "brcm,bcm6358-leds" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(bcm6358_led) = {
.name = "bcm6358-led",
.id = UCLASS_LED,
.of_match = bcm6358_led_ids,
.bind = bcm6358_led_bind,
.probe = bcm6358_led_probe,
.priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
.ops = &bcm6358_led_ops,
};