From ea578703b03d5d651b091c39f717dc829155b520 Mon Sep 17 00:00:00 2001
From: Kurt Kanzenbach <kurt@linutronix.de>
Date: Tue, 13 Feb 2024 10:41:37 -0800
Subject: igc: Add support for LEDs on i225/i226
Add support for LEDs on i225/i226. The LEDs can be controlled via sysfs
from user space using the netdev trigger. The LEDs are named as
igc-<bus><device>-<led> to be easily identified.
Offloading link speed and activity are supported. Other modes are simulated
in software by using on/off. Tested on Intel i225.
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20240213184138.1483968-1-anthony.l.nguyen@intel.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
drivers/net/ethernet/intel/igc/igc_leds.c | 280 ++++++++++++++++++++++++++++++
1 file changed, 280 insertions(+)
create mode 100644 drivers/net/ethernet/intel/igc/igc_leds.c
(limited to 'drivers/net/ethernet/intel/igc/igc_leds.c')
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 000000000000..bf240c5daf86
--- /dev/null
+++ b/drivers/net/ethernet/intel/igc/igc_leds.c
@@ -0,0 +1,280 @@
+// 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 void 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;
+
+ devm_led_classdev_register(&netdev->dev, led_cdev);
+}
+
+int igc_led_setup(struct igc_adapter *adapter)
+{
+ struct net_device *netdev = adapter->netdev;
+ struct device *dev = &netdev->dev;
+ struct igc_led_classdev *leds;
+ int i;
+
+ mutex_init(&adapter->led_mutex);
+
+ leds = devm_kcalloc(dev, IGC_NUM_LEDS, sizeof(*leds), GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ for (i = 0; i < IGC_NUM_LEDS; i++)
+ igc_setup_ldev(leds + i, netdev, i);
+
+ return 0;
+}
--
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