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Diffstat (limited to 'drivers/leds/leds-bcm6328.c')
-rw-r--r--drivers/leds/leds-bcm6328.c486
1 files changed, 486 insertions, 0 deletions
diff --git a/drivers/leds/leds-bcm6328.c b/drivers/leds/leds-bcm6328.c
new file mode 100644
index 0000000000..246f1296ab
--- /dev/null
+++ b/drivers/leds/leds-bcm6328.c
@@ -0,0 +1,486 @@
+// 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_BLINK_DELAYS 2
+#define BCM6328_LED_BLINK_MS 20
+
+#define BCM6328_LED_BLINK_MASK 0x3f
+#define BCM6328_LED_BLINK1_SHIFT 0
+#define BCM6328_LED_BLINK1_MASK (BCM6328_LED_BLINK_MASK << \
+ BCM6328_LED_BLINK1_SHIFT)
+#define BCM6328_LED_BLINK2_SHIFT 6
+#define BCM6328_LED_BLINK2_MASK (BCM6328_LED_BLINK_MASK << \
+ BCM6328_LED_BLINK2_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_BLINK1 1
+#define BCM6328_LED_MODE_BLINK2 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);
+
+ /* Remove LED from cached HW blinking intervals */
+ led->blink_leds[0] &= ~BIT(led->pin);
+ led->blink_leds[1] &= ~BIT(led->pin);
+
+ /* Set LED on/off */
+ 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_BLINK_MS / 2;
+ bcm6328_delay = bcm6328_delay / BCM6328_LED_BLINK_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_BLINK_MASK) {
+ dev_dbg(led_cdev->dev,
+ "fallback to soft blinking (delay > %ums)\n",
+ BCM6328_LED_BLINK_MASK * BCM6328_LED_BLINK_MS);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(led->lock, flags);
+ /*
+ * Check if any of the two configurable HW blinking intervals is
+ * available:
+ * 1. No LEDs assigned to the HW blinking interval.
+ * 2. Only this LED is assigned to the HW blinking interval.
+ * 3. LEDs with the same delay assigned.
+ */
+ if (led->blink_leds[0] == 0 ||
+ led->blink_leds[0] == BIT(led->pin) ||
+ led->blink_delay[0] == delay) {
+ unsigned long val;
+
+ /* Add LED to the first HW blinking interval cache */
+ led->blink_leds[0] |= BIT(led->pin);
+
+ /* Remove LED from the second HW blinking interval cache */
+ led->blink_leds[1] &= ~BIT(led->pin);
+
+ /* Cache first HW blinking interval delay */
+ led->blink_delay[0] = delay;
+
+ /* Update the delay for the first HW blinking interval */
+ val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
+ val &= ~BCM6328_LED_BLINK1_MASK;
+ val |= (delay << BCM6328_LED_BLINK1_SHIFT);
+ bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
+
+ /* Set the LED to first HW blinking interval */
+ bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK1);
+
+ rc = 0;
+ } else if (led->blink_leds[1] == 0 ||
+ led->blink_leds[1] == BIT(led->pin) ||
+ led->blink_delay[1] == delay) {
+ unsigned long val;
+
+ /* Remove LED from the first HW blinking interval */
+ led->blink_leds[0] &= ~BIT(led->pin);
+
+ /* Add LED to the second HW blinking interval */
+ led->blink_leds[1] |= BIT(led->pin);
+
+ /* Cache second HW blinking interval delay */
+ led->blink_delay[1] = delay;
+
+ /* Update the delay for the second HW blinking interval */
+ val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
+ val &= ~BCM6328_LED_BLINK2_MASK;
+ val |= (delay << BCM6328_LED_BLINK2_SHIFT);
+ bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
+
+ /* Set the LED to second HW blinking interval */
+ bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK2);
+
+ 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 led_init_data init_data = {};
+ struct bcm6328_led *led;
+ enum led_default_state state;
+ unsigned long val, shift;
+ void __iomem *mode;
+ 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;
+
+ init_data.fwnode = of_fwnode_handle(nc);
+
+ state = led_init_default_state_get(init_data.fwnode);
+ switch (state) {
+ case LEDS_DEFSTATE_ON:
+ led->cdev.brightness = LED_FULL;
+ break;
+ case LEDS_DEFSTATE_KEEP:
+ 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;
+ break;
+ default:
+ 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 = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
+ 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 = dev_of_node(&pdev->dev);
+ struct device_node *child;
+ void __iomem *mem;
+ spinlock_t *lock; /* memory lock */
+ unsigned long val, *blink_leds, *blink_delay;
+
+ mem = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(mem))
+ return PTR_ERR(mem);
+
+ lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL);
+ if (!lock)
+ return -ENOMEM;
+
+ blink_leds = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
+ sizeof(*blink_leds), GFP_KERNEL);
+ if (!blink_leds)
+ return -ENOMEM;
+
+ blink_delay = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
+ 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 14:23:02 +0000