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alistair23-linux/drivers/leds/leds-bcm6328.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c
*
* Copyright 2015 Álvaro Fernández Rojas <noltari@gmail.com>
* Copyright 2015 Jonas Gorski <jogo@openwrt.org>
*/
#include <linux/io.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#define BCM6328_REG_INIT 0x00
#define BCM6328_REG_MODE_HI 0x04
#define BCM6328_REG_MODE_LO 0x08
#define BCM6328_REG_HWDIS 0x0c
#define BCM6328_REG_STROBE 0x10
#define BCM6328_REG_LNKACTSEL_HI 0x14
#define BCM6328_REG_LNKACTSEL_LO 0x18
#define BCM6328_REG_RBACK 0x1c
#define BCM6328_REG_SERMUX 0x20
#define BCM6328_LED_MAX_COUNT 24
#define BCM6328_LED_DEF_DELAY 500
#define BCM6328_LED_INTERVAL_MS 20
#define BCM6328_LED_INTV_MASK 0x3f
#define BCM6328_LED_FAST_INTV_SHIFT 6
#define BCM6328_LED_FAST_INTV_MASK (BCM6328_LED_INTV_MASK << \
BCM6328_LED_FAST_INTV_SHIFT)
#define BCM6328_SERIAL_LED_EN BIT(12)
#define BCM6328_SERIAL_LED_MUX BIT(13)
#define BCM6328_SERIAL_LED_CLK_NPOL BIT(14)
#define BCM6328_SERIAL_LED_DATA_PPOL BIT(15)
#define BCM6328_SERIAL_LED_SHIFT_DIR BIT(16)
#define BCM6328_LED_SHIFT_TEST BIT(30)
#define BCM6328_LED_TEST BIT(31)
#define BCM6328_INIT_MASK (BCM6328_SERIAL_LED_EN | \
BCM6328_SERIAL_LED_MUX | \
BCM6328_SERIAL_LED_CLK_NPOL | \
BCM6328_SERIAL_LED_DATA_PPOL | \
BCM6328_SERIAL_LED_SHIFT_DIR)
#define BCM6328_LED_MODE_MASK 3
#define BCM6328_LED_MODE_ON 0
#define BCM6328_LED_MODE_FAST 1
#define BCM6328_LED_MODE_BLINK 2
#define BCM6328_LED_MODE_OFF 3
#define BCM6328_LED_SHIFT(X) ((X) << 1)
/**
* struct bcm6328_led - state container for bcm6328 based LEDs
* @cdev: LED class device for this LED
* @mem: memory resource
* @lock: memory lock
* @pin: LED pin number
* @blink_leds: blinking LEDs
* @blink_delay: blinking delay
* @active_low: LED is active low
*/
struct bcm6328_led {
struct led_classdev cdev;
void __iomem *mem;
spinlock_t *lock;
unsigned long pin;
unsigned long *blink_leds;
unsigned long *blink_delay;
bool active_low;
};
static void bcm6328_led_write(void __iomem *reg, unsigned long data)
{
#ifdef CONFIG_CPU_BIG_ENDIAN
iowrite32be(data, reg);
#else
writel(data, reg);
#endif
}
static unsigned long bcm6328_led_read(void __iomem *reg)
{
#ifdef CONFIG_CPU_BIG_ENDIAN
return ioread32be(reg);
#else
return readl(reg);
#endif
}
/**
* LEDMode 64 bits / 24 LEDs
* bits [31:0] -> LEDs 8-23
* bits [47:32] -> LEDs 0-7
* bits [63:48] -> unused
*/
static unsigned long bcm6328_pin2shift(unsigned long pin)
{
if (pin < 8)
return pin + 16; /* LEDs 0-7 (bits 47:32) */
else
return pin - 8; /* LEDs 8-23 (bits 31:0) */
}
static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value)
{
void __iomem *mode;
unsigned long val, shift;
shift = bcm6328_pin2shift(led->pin);
if (shift / 16)
mode = led->mem + BCM6328_REG_MODE_HI;
else
mode = led->mem + BCM6328_REG_MODE_LO;
val = bcm6328_led_read(mode);
val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16));
val |= (value << BCM6328_LED_SHIFT(shift % 16));
bcm6328_led_write(mode, val);
}
static void bcm6328_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct bcm6328_led *led =
container_of(led_cdev, struct bcm6328_led, cdev);
unsigned long flags;
spin_lock_irqsave(led->lock, flags);
*(led->blink_leds) &= ~BIT(led->pin);
if ((led->active_low && value == LED_OFF) ||
(!led->active_low && value != LED_OFF))
bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
else
bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
spin_unlock_irqrestore(led->lock, flags);
}
static unsigned long bcm6328_blink_delay(unsigned long delay)
{
unsigned long bcm6328_delay;
bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2;
bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS;
if (bcm6328_delay == 0)
bcm6328_delay = 1;
return bcm6328_delay;
}
static int bcm6328_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on, unsigned long *delay_off)
{
struct bcm6328_led *led =
container_of(led_cdev, struct bcm6328_led, cdev);
unsigned long delay, flags;
int rc;
if (!*delay_on)
*delay_on = BCM6328_LED_DEF_DELAY;
if (!*delay_off)
*delay_off = BCM6328_LED_DEF_DELAY;
delay = bcm6328_blink_delay(*delay_on);
if (delay != bcm6328_blink_delay(*delay_off)) {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay_on != delay_off)\n");
return -EINVAL;
}
if (delay > BCM6328_LED_INTV_MASK) {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay > %ums)\n",
BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);
return -EINVAL;
}
spin_lock_irqsave(led->lock, flags);
if (*(led->blink_leds) == 0 ||
*(led->blink_leds) == BIT(led->pin) ||
*(led->blink_delay) == delay) {
unsigned long val;
*(led->blink_leds) |= BIT(led->pin);
*(led->blink_delay) = delay;
val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
val &= ~BCM6328_LED_FAST_INTV_MASK;
val |= (delay << BCM6328_LED_FAST_INTV_SHIFT);
bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK);
rc = 0;
} else {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay already set)\n");
rc = -EINVAL;
}
spin_unlock_irqrestore(led->lock, flags);
return rc;
}
static int bcm6328_hwled(struct device *dev, struct device_node *nc, u32 reg,
void __iomem *mem, spinlock_t *lock)
{
int i, cnt;
unsigned long flags, val;
spin_lock_irqsave(lock, flags);
val = bcm6328_led_read(mem + BCM6328_REG_HWDIS);
val &= ~BIT(reg);
bcm6328_led_write(mem + BCM6328_REG_HWDIS, val);
spin_unlock_irqrestore(lock, flags);
/* Only LEDs 0-7 can be activity/link controlled */
if (reg >= 8)
return 0;
cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources",
sizeof(u32));
for (i = 0; i < cnt; i++) {
u32 sel;
void __iomem *addr;
if (reg < 4)
addr = mem + BCM6328_REG_LNKACTSEL_LO;
else
addr = mem + BCM6328_REG_LNKACTSEL_HI;
of_property_read_u32_index(nc, "brcm,link-signal-sources", i,
&sel);
if (reg / 4 != sel / 4) {
dev_warn(dev, "invalid link signal source\n");
continue;
}
spin_lock_irqsave(lock, flags);
val = bcm6328_led_read(addr);
val |= (BIT(reg % 4) << (((sel % 4) * 4) + 16));
bcm6328_led_write(addr, val);
spin_unlock_irqrestore(lock, flags);
}
cnt = of_property_count_elems_of_size(nc,
"brcm,activity-signal-sources",
sizeof(u32));
for (i = 0; i < cnt; i++) {
u32 sel;
void __iomem *addr;
if (reg < 4)
addr = mem + BCM6328_REG_LNKACTSEL_LO;
else
addr = mem + BCM6328_REG_LNKACTSEL_HI;
of_property_read_u32_index(nc, "brcm,activity-signal-sources",
i, &sel);
if (reg / 4 != sel / 4) {
dev_warn(dev, "invalid activity signal source\n");
continue;
}
spin_lock_irqsave(lock, flags);
val = bcm6328_led_read(addr);
val |= (BIT(reg % 4) << ((sel % 4) * 4));
bcm6328_led_write(addr, val);
spin_unlock_irqrestore(lock, flags);
}
return 0;
}
static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
void __iomem *mem, spinlock_t *lock,
unsigned long *blink_leds, unsigned long *blink_delay)
{
struct bcm6328_led *led;
const char *state;
int rc;
led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->pin = reg;
led->mem = mem;
led->lock = lock;
led->blink_leds = blink_leds;
led->blink_delay = blink_delay;
if (of_property_read_bool(nc, "active-low"))
led->active_low = true;
led->cdev.name = of_get_property(nc, "label", NULL) ? : nc->name;
led->cdev.default_trigger = of_get_property(nc,
"linux,default-trigger",
NULL);
if (!of_property_read_string(nc, "default-state", &state)) {
if (!strcmp(state, "on")) {
led->cdev.brightness = LED_FULL;
} else if (!strcmp(state, "keep")) {
void __iomem *mode;
unsigned long val, shift;
shift = bcm6328_pin2shift(led->pin);
if (shift / 16)
mode = mem + BCM6328_REG_MODE_HI;
else
mode = mem + BCM6328_REG_MODE_LO;
val = bcm6328_led_read(mode) >>
BCM6328_LED_SHIFT(shift % 16);
val &= BCM6328_LED_MODE_MASK;
if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||
(!led->active_low && val == BCM6328_LED_MODE_ON))
led->cdev.brightness = LED_FULL;
else
led->cdev.brightness = LED_OFF;
} else {
led->cdev.brightness = LED_OFF;
}
} else {
led->cdev.brightness = LED_OFF;
}
bcm6328_led_set(&led->cdev, led->cdev.brightness);
led->cdev.brightness_set = bcm6328_led_set;
led->cdev.blink_set = bcm6328_blink_set;
rc = led_classdev_register(dev, &led->cdev);
if (rc < 0)
return rc;
dev_dbg(dev, "registered LED %s\n", led->cdev.name);
return 0;
}
static int bcm6328_leds_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
struct resource *mem_r;
void __iomem *mem;
spinlock_t *lock; /* memory lock */
unsigned long val, *blink_leds, *blink_delay;
mem_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_r)
return -EINVAL;
mem = devm_ioremap_resource(dev, mem_r);
if (IS_ERR(mem))
return PTR_ERR(mem);
lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL);
if (!lock)
return -ENOMEM;
blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL);
if (!blink_leds)
return -ENOMEM;
blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL);
if (!blink_delay)
return -ENOMEM;
spin_lock_init(lock);
bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0);
bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0);
bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0);
val = bcm6328_led_read(mem + BCM6328_REG_INIT);
val &= ~(BCM6328_INIT_MASK);
if (of_property_read_bool(np, "brcm,serial-leds"))
val |= BCM6328_SERIAL_LED_EN;
if (of_property_read_bool(np, "brcm,serial-mux"))
val |= BCM6328_SERIAL_LED_MUX;
if (of_property_read_bool(np, "brcm,serial-clk-low"))
val |= BCM6328_SERIAL_LED_CLK_NPOL;
if (!of_property_read_bool(np, "brcm,serial-dat-low"))
val |= BCM6328_SERIAL_LED_DATA_PPOL;
if (!of_property_read_bool(np, "brcm,serial-shift-inv"))
val |= BCM6328_SERIAL_LED_SHIFT_DIR;
bcm6328_led_write(mem + BCM6328_REG_INIT, val);
for_each_available_child_of_node(np, child) {
int rc;
u32 reg;
if (of_property_read_u32(child, "reg", &reg))
continue;
if (reg >= BCM6328_LED_MAX_COUNT) {
dev_err(dev, "invalid LED (%u >= %d)\n", reg,
BCM6328_LED_MAX_COUNT);
continue;
}
if (of_property_read_bool(child, "brcm,hardware-controlled"))
rc = bcm6328_hwled(dev, child, reg, mem, lock);
else
rc = bcm6328_led(dev, child, reg, mem, lock,
blink_leds, blink_delay);
if (rc < 0) {
of_node_put(child);
return rc;
}
}
return 0;
}
static const struct of_device_id bcm6328_leds_of_match[] = {
{ .compatible = "brcm,bcm6328-leds", },
{ },
};
MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match);
static struct platform_driver bcm6328_leds_driver = {
.probe = bcm6328_leds_probe,
.driver = {
.name = "leds-bcm6328",
.of_match_table = bcm6328_leds_of_match,
},
};
module_platform_driver(bcm6328_leds_driver);
MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
MODULE_DESCRIPTION("LED driver for BCM6328 controllers");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:leds-bcm6328");
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