1 files changed, 302 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_leds.c b/drivers/net/ethernet/intel/igc/igc_leds.c
new file mode 100644
index 0000000000..3929b25b6a
--- /dev/null
+++ b/drivers/net/ethernet/intel/igc/igc_leds.c
@@ -0,0 +1,302 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2024 Linutronix GmbH */
+
+#include <linux/bits.h>
+#include <linux/leds.h>
+#include <linux/netdevice.h>
+#include <linux/pm_runtime.h>
+#include <uapi/linux/uleds.h>
+
+#include "igc.h"
+
+#define IGC_NUM_LEDS			3
+
+#define IGC_LEDCTL_LED0_MODE_SHIFT	0
+#define IGC_LEDCTL_LED0_MODE_MASK	GENMASK(3, 0)
+#define IGC_LEDCTL_LED0_BLINK		BIT(7)
+#define IGC_LEDCTL_LED1_MODE_SHIFT	8
+#define IGC_LEDCTL_LED1_MODE_MASK	GENMASK(11, 8)
+#define IGC_LEDCTL_LED1_BLINK		BIT(15)
+#define IGC_LEDCTL_LED2_MODE_SHIFT	16
+#define IGC_LEDCTL_LED2_MODE_MASK	GENMASK(19, 16)
+#define IGC_LEDCTL_LED2_BLINK		BIT(23)
+
+#define IGC_LEDCTL_MODE_ON		0x00
+#define IGC_LEDCTL_MODE_OFF		0x01
+#define IGC_LEDCTL_MODE_LINK_10		0x05
+#define IGC_LEDCTL_MODE_LINK_100	0x06
+#define IGC_LEDCTL_MODE_LINK_1000	0x07
+#define IGC_LEDCTL_MODE_LINK_2500	0x08
+#define IGC_LEDCTL_MODE_ACTIVITY	0x0b
+
+#define IGC_SUPPORTED_MODES						 \
+	(BIT(TRIGGER_NETDEV_LINK_2500) | BIT(TRIGGER_NETDEV_LINK_1000) | \
+	 BIT(TRIGGER_NETDEV_LINK_100) | BIT(TRIGGER_NETDEV_LINK_10) |	 \
+	 BIT(TRIGGER_NETDEV_RX) | BIT(TRIGGER_NETDEV_TX))
+
+#define IGC_ACTIVITY_MODES					\
+	(BIT(TRIGGER_NETDEV_RX) | BIT(TRIGGER_NETDEV_TX))
+
+struct igc_led_classdev {
+	struct net_device *netdev;
+	struct led_classdev led;
+	int index;
+};
+
+#define lcdev_to_igc_ldev(lcdev)				\
+	container_of(lcdev, struct igc_led_classdev, led)
+
+static void igc_led_select(struct igc_adapter *adapter, int led,
+			   u32 *mask, u32 *shift, u32 *blink)
+{
+	switch (led) {
+	case 0:
+		*mask  = IGC_LEDCTL_LED0_MODE_MASK;
+		*shift = IGC_LEDCTL_LED0_MODE_SHIFT;
+		*blink = IGC_LEDCTL_LED0_BLINK;
+		break;
+	case 1:
+		*mask  = IGC_LEDCTL_LED1_MODE_MASK;
+		*shift = IGC_LEDCTL_LED1_MODE_SHIFT;
+		*blink = IGC_LEDCTL_LED1_BLINK;
+		break;
+	case 2:
+		*mask  = IGC_LEDCTL_LED2_MODE_MASK;
+		*shift = IGC_LEDCTL_LED2_MODE_SHIFT;
+		*blink = IGC_LEDCTL_LED2_BLINK;
+		break;
+	default:
+		*mask = *shift = *blink = 0;
+		netdev_err(adapter->netdev, "Unknown LED %d selected!\n", led);
+	}
+}
+
+static void igc_led_set(struct igc_adapter *adapter, int led, u32 mode,
+			bool blink)
+{
+	u32 shift, mask, blink_bit, ledctl;
+	struct igc_hw *hw = &adapter->hw;
+
+	igc_led_select(adapter, led, &mask, &shift, &blink_bit);
+
+	pm_runtime_get_sync(&adapter->pdev->dev);
+	mutex_lock(&adapter->led_mutex);
+
+	/* Set mode */
+	ledctl = rd32(IGC_LEDCTL);
+	ledctl &= ~mask;
+	ledctl |= mode << shift;
+
+	/* Configure blinking */
+	if (blink)
+		ledctl |= blink_bit;
+	else
+		ledctl &= ~blink_bit;
+	wr32(IGC_LEDCTL, ledctl);
+
+	mutex_unlock(&adapter->led_mutex);
+	pm_runtime_put(&adapter->pdev->dev);
+}
+
+static u32 igc_led_get(struct igc_adapter *adapter, int led)
+{
+	u32 shift, mask, blink_bit, ledctl;
+	struct igc_hw *hw = &adapter->hw;
+
+	igc_led_select(adapter, led, &mask, &shift, &blink_bit);
+
+	pm_runtime_get_sync(&adapter->pdev->dev);
+	mutex_lock(&adapter->led_mutex);
+	ledctl = rd32(IGC_LEDCTL);
+	mutex_unlock(&adapter->led_mutex);
+	pm_runtime_put(&adapter->pdev->dev);
+
+	return (ledctl & mask) >> shift;
+}
+
+static int igc_led_brightness_set_blocking(struct led_classdev *led_cdev,
+					   enum led_brightness brightness)
+{
+	struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
+	struct igc_adapter *adapter = netdev_priv(ldev->netdev);
+	u32 mode;
+
+	if (brightness)
+		mode = IGC_LEDCTL_MODE_ON;
+	else
+		mode = IGC_LEDCTL_MODE_OFF;
+
+	netdev_dbg(adapter->netdev, "Set brightness for LED %d to mode %u!\n",
+		   ldev->index, mode);
+
+	igc_led_set(adapter, ldev->index, mode, false);
+
+	return 0;
+}
+
+static int igc_led_hw_control_is_supported(struct led_classdev *led_cdev,
+					   unsigned long flags)
+{
+	if (flags & ~IGC_SUPPORTED_MODES)
+		return -EOPNOTSUPP;
+
+	/* If Tx and Rx selected, activity can be offloaded unless some other
+	 * mode is selected as well.
+	 */
+	if ((flags & BIT(TRIGGER_NETDEV_TX)) &&
+	    (flags & BIT(TRIGGER_NETDEV_RX)) &&
+	    !(flags & ~IGC_ACTIVITY_MODES))
+		return 0;
+
+	/* Single Rx or Tx activity is not supported. */
+	if (flags & IGC_ACTIVITY_MODES)
+		return -EOPNOTSUPP;
+
+	/* Only one mode can be active at a given time. */
+	if (flags & (flags - 1))
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static int igc_led_hw_control_set(struct led_classdev *led_cdev,
+				  unsigned long flags)
+{
+	struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
+	struct igc_adapter *adapter = netdev_priv(ldev->netdev);
+	u32 mode = IGC_LEDCTL_MODE_OFF;
+	bool blink = false;
+
+	if (flags & BIT(TRIGGER_NETDEV_LINK_10))
+		mode = IGC_LEDCTL_MODE_LINK_10;
+	if (flags & BIT(TRIGGER_NETDEV_LINK_100))
+		mode = IGC_LEDCTL_MODE_LINK_100;
+	if (flags & BIT(TRIGGER_NETDEV_LINK_1000))
+		mode = IGC_LEDCTL_MODE_LINK_1000;
+	if (flags & BIT(TRIGGER_NETDEV_LINK_2500))
+		mode = IGC_LEDCTL_MODE_LINK_2500;
+	if ((flags & BIT(TRIGGER_NETDEV_TX)) &&
+	    (flags & BIT(TRIGGER_NETDEV_RX)))
+		mode = IGC_LEDCTL_MODE_ACTIVITY;
+
+	netdev_dbg(adapter->netdev, "Set HW control for LED %d to mode %u!\n",
+		   ldev->index, mode);
+
+	/* blink is recommended for activity */
+	if (mode == IGC_LEDCTL_MODE_ACTIVITY)
+		blink = true;
+
+	igc_led_set(adapter, ldev->index, mode, blink);
+
+	return 0;
+}
+
+static int igc_led_hw_control_get(struct led_classdev *led_cdev,
+				  unsigned long *flags)
+{
+	struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
+	struct igc_adapter *adapter = netdev_priv(ldev->netdev);
+	u32 mode;
+
+	mode = igc_led_get(adapter, ldev->index);
+
+	switch (mode) {
+	case IGC_LEDCTL_MODE_ACTIVITY:
+		*flags = BIT(TRIGGER_NETDEV_TX) | BIT(TRIGGER_NETDEV_RX);
+		break;
+	case IGC_LEDCTL_MODE_LINK_10:
+		*flags = BIT(TRIGGER_NETDEV_LINK_10);
+		break;
+	case IGC_LEDCTL_MODE_LINK_100:
+		*flags = BIT(TRIGGER_NETDEV_LINK_100);
+		break;
+	case IGC_LEDCTL_MODE_LINK_1000:
+		*flags = BIT(TRIGGER_NETDEV_LINK_1000);
+		break;
+	case IGC_LEDCTL_MODE_LINK_2500:
+		*flags = BIT(TRIGGER_NETDEV_LINK_2500);
+		break;
+	}
+
+	return 0;
+}
+
+static struct device *igc_led_hw_control_get_device(struct led_classdev *led_cdev)
+{
+	struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
+
+	return &ldev->netdev->dev;
+}
+
+static void igc_led_get_name(struct igc_adapter *adapter, int index, char *buf,
+			     size_t buf_len)
+{
+	snprintf(buf, buf_len, "igc-%x%x-led%d",
+		 pci_domain_nr(adapter->pdev->bus),
+		 pci_dev_id(adapter->pdev), index);
+}
+
+static int igc_setup_ldev(struct igc_led_classdev *ldev,
+			  struct net_device *netdev, int index)
+{
+	struct igc_adapter *adapter = netdev_priv(netdev);
+	struct led_classdev *led_cdev = &ldev->led;
+	char led_name[LED_MAX_NAME_SIZE];
+
+	ldev->netdev = netdev;
+	ldev->index = index;
+
+	igc_led_get_name(adapter, index, led_name, LED_MAX_NAME_SIZE);
+	led_cdev->name = led_name;
+	led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
+	led_cdev->max_brightness = 1;
+	led_cdev->brightness_set_blocking = igc_led_brightness_set_blocking;
+	led_cdev->hw_control_trigger = "netdev";
+	led_cdev->hw_control_is_supported = igc_led_hw_control_is_supported;
+	led_cdev->hw_control_set = igc_led_hw_control_set;
+	led_cdev->hw_control_get = igc_led_hw_control_get;
+	led_cdev->hw_control_get_device = igc_led_hw_control_get_device;
+
+	return led_classdev_register(&netdev->dev, led_cdev);
+}
+
+int igc_led_setup(struct igc_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct igc_led_classdev *leds;
+	int i, err;
+
+	mutex_init(&adapter->led_mutex);
+
+	leds = kcalloc(IGC_NUM_LEDS, sizeof(*leds), GFP_KERNEL);
+	if (!leds)
+		return -ENOMEM;
+
+	for (i = 0; i < IGC_NUM_LEDS; i++) {
+		err = igc_setup_ldev(leds + i, netdev, i);
+		if (err)
+			goto err;
+	}
+
+	adapter->leds = leds;
+
+	return 0;
+
+err:
+	for (i--; i >= 0; i--)
+		led_classdev_unregister(&((leds + i)->led));
+
+	kfree(leds);
+	return err;
+}
+
+void igc_led_free(struct igc_adapter *adapter)
+{
+	struct igc_led_classdev *leds = adapter->leds;
+	int i;
+
+	for (i = 0; i < IGC_NUM_LEDS; i++)
+		led_classdev_unregister(&((leds + i)->led));
+
+	kfree(leds);
+}