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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 24
/* LED Init register */
#define LED_INIT_REG 0x00
#define LED_INIT_FASTINTV_MS 20
#define LED_INIT_FASTINTV_SHIFT 6
#define LED_INIT_FASTINTV_MASK (0x3f << LED_INIT_FASTINTV_SHIFT)
#define LED_INIT_SLEDEN_SHIFT 12
#define LED_INIT_SLEDEN_MASK (1 << LED_INIT_SLEDEN_SHIFT)
#define LED_INIT_SLEDMUX_SHIFT 13
#define LED_INIT_SLEDMUX_MASK (1 << LED_INIT_SLEDMUX_SHIFT)
#define LED_INIT_SLEDCLKNPOL_SHIFT 14
#define LED_INIT_SLEDCLKNPOL_MASK (1 << LED_INIT_SLEDCLKNPOL_SHIFT)
#define LED_INIT_SLEDDATAPPOL_SHIFT 15
#define LED_INIT_SLEDDATANPOL_MASK (1 << LED_INIT_SLEDDATAPPOL_SHIFT)
#define LED_INIT_SLEDSHIFTDIR_SHIFT 16
#define LED_INIT_SLEDSHIFTDIR_MASK (1 << LED_INIT_SLEDSHIFTDIR_SHIFT)
/* LED Mode registers */
#define LED_MODE_REG_HI 0x04
#define LED_MODE_REG_LO 0x08
#define LED_MODE_ON 0
#define LED_MODE_FAST 1
#define LED_MODE_BLINK 2
#define LED_MODE_OFF 3
#define LED_MODE_MASK 0x3
struct bcm6328_led_priv {
void __iomem *regs;
void __iomem *mode;
uint8_t shift;
bool active_low;
};
static unsigned long bcm6328_led_get_mode(struct bcm6328_led_priv *priv)
{
return ((readl_be(priv->mode) >> priv->shift) & LED_MODE_MASK);
}
static int bcm6328_led_set_mode(struct bcm6328_led_priv *priv, uint8_t mode)
{
clrsetbits_be32(priv->mode, (LED_MODE_MASK << priv->shift),
(mode << priv->shift));
return 0;
}
static enum led_state_t bcm6328_led_get_state(struct udevice *dev)
{
struct bcm6328_led_priv *priv = dev_get_priv(dev);
enum led_state_t state = LEDST_OFF;
switch (bcm6328_led_get_mode(priv)) {
#ifdef CONFIG_LED_BLINK
case LED_MODE_BLINK:
case LED_MODE_FAST:
state = LEDST_BLINK;
break;
#endif
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 bcm6328_led_set_state(struct udevice *dev, enum led_state_t state)
{
struct bcm6328_led_priv *priv = dev_get_priv(dev);
unsigned long mode;
switch (state) {
#ifdef CONFIG_LED_BLINK
case LEDST_BLINK:
mode = LED_MODE_BLINK;
break;
#endif
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 (bcm6328_led_get_state(dev) == LEDST_OFF)
return bcm6328_led_set_state(dev, LEDST_ON);
else
return bcm6328_led_set_state(dev, LEDST_OFF);
break;
default:
return -ENOSYS;
}
return bcm6328_led_set_mode(priv, mode);
}
#ifdef CONFIG_LED_BLINK
static unsigned long bcm6328_blink_delay(int delay)
{
unsigned long bcm6328_delay = delay;
bcm6328_delay += (LED_INIT_FASTINTV_MS / 2);
bcm6328_delay /= LED_INIT_FASTINTV_MS;
bcm6328_delay <<= LED_INIT_FASTINTV_SHIFT;
if (bcm6328_delay > LED_INIT_FASTINTV_MASK)
return LED_INIT_FASTINTV_MASK;
else
return bcm6328_delay;
}
static int bcm6328_led_set_period(struct udevice *dev, int period_ms)
{
struct bcm6328_led_priv *priv = dev_get_priv(dev);
clrsetbits_be32(priv->regs + LED_INIT_REG, LED_INIT_FASTINTV_MASK,
bcm6328_blink_delay(period_ms));
return 0;
}
#endif
static const struct led_ops bcm6328_led_ops = {
.get_state = bcm6328_led_get_state,
.set_state = bcm6328_led_set_state,
#ifdef CONFIG_LED_BLINK
.set_period = bcm6328_led_set_period,
#endif
};
static int bcm6328_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;
u32 set_bits = 0;
regs = dev_remap_addr(dev);
if (!regs)
return -EINVAL;
if (dev_read_bool(dev, "brcm,serial-leds"))
set_bits |= LED_INIT_SLEDEN_MASK;
if (dev_read_bool(dev, "brcm,serial-mux"))
set_bits |= LED_INIT_SLEDMUX_MASK;
if (dev_read_bool(dev, "brcm,serial-clk-low"))
set_bits |= LED_INIT_SLEDCLKNPOL_MASK;
if (!dev_read_bool(dev, "brcm,serial-dat-low"))
set_bits |= LED_INIT_SLEDDATANPOL_MASK;
if (!dev_read_bool(dev, "brcm,serial-shift-inv"))
set_bits |= LED_INIT_SLEDSHIFTDIR_MASK;
clrsetbits_be32(regs + LED_INIT_REG, ~0, set_bits);
} else {
struct bcm6328_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;
if (pin < 8) {
/* LEDs 0-7 (bits 47:32) */
priv->mode = priv->regs + LED_MODE_REG_HI;
priv->shift = (pin << 1);
} else {
/* LEDs 8-23 (bits 31:0) */
priv->mode = priv->regs + LED_MODE_REG_LO;
priv->shift = ((pin - 8) << 1);
}
if (dev_read_bool(dev, "active-low"))
priv->active_low = true;
}
return 0;
}
static int bcm6328_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, "bcm6328-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 bcm6328_led_ids[] = {
{ .compatible = "brcm,bcm6328-leds" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(bcm6328_led) = {
.name = "bcm6328-led",
.id = UCLASS_LED,
.of_match = bcm6328_led_ids,
.ops = &bcm6328_led_ops,
.bind = bcm6328_led_bind,
.probe = bcm6328_led_probe,
.priv_auto_alloc_size = sizeof(struct bcm6328_led_priv),
};
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