can: kvaser_pciefd: Add support to control CAN LEDs on device

Add support to turn on/off CAN LEDs on device.
Turn off all CAN LEDs in probe, since they are default on after a reset or
power on.

Reviewed-by: Axel Forsman <axfo@kvaser.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Link: https://patch.msgid.link/20250725123230.8-2-extja@kvaser.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index 09510663988c7e7af4b9519c73140940d40b4236..c8f530ef416e4f9e57ef69c0c95bac374389db35 100644 (file)
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -66,6 +66,7 @@ MODULE_DESCRIPTION("CAN driver for Kvaser CAN/PCIe devices");
 #define KVASER_PCIEFD_KCAN_FIFO_LAST_REG 0x180
 #define KVASER_PCIEFD_KCAN_CTRL_REG 0x2c0
 #define KVASER_PCIEFD_KCAN_CMD_REG 0x400
+#define KVASER_PCIEFD_KCAN_IOC_REG 0x404
 #define KVASER_PCIEFD_KCAN_IEN_REG 0x408
 #define KVASER_PCIEFD_KCAN_IRQ_REG 0x410
 #define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG 0x414
@@ -136,6 +137,9 @@ MODULE_DESCRIPTION("CAN driver for Kvaser CAN/PCIe devices");
 /* Request status packet */
 #define KVASER_PCIEFD_KCAN_CMD_SRQ BIT(0)
 
+/* Control CAN LED, active low */
+#define KVASER_PCIEFD_KCAN_IOC_LED BIT(0)
+
 /* Transmitter unaligned */
 #define KVASER_PCIEFD_KCAN_IRQ_TAL BIT(17)
 /* Tx FIFO empty */
@@ -410,6 +414,7 @@ struct kvaser_pciefd_can {
        struct kvaser_pciefd *kv_pcie;
        void __iomem *reg_base;
        struct can_berr_counter bec;
+       u32 ioc;
        u8 cmd_seq;
        u8 tx_max_count;
        u8 tx_idx;
@@ -528,6 +533,16 @@ static inline void kvaser_pciefd_abort_flush_reset(struct kvaser_pciefd_can *can
        kvaser_pciefd_send_kcan_cmd(can, KVASER_PCIEFD_KCAN_CMD_AT);
 }
 
+static inline void kvaser_pciefd_set_led(struct kvaser_pciefd_can *can, bool on)
+{
+       if (on)
+               can->ioc &= ~KVASER_PCIEFD_KCAN_IOC_LED;
+       else
+               can->ioc |= KVASER_PCIEFD_KCAN_IOC_LED;
+
+       iowrite32(can->ioc, can->reg_base + KVASER_PCIEFD_KCAN_IOC_REG);
+}
+
 static void kvaser_pciefd_enable_err_gen(struct kvaser_pciefd_can *can)
 {
        u32 mode;
@@ -990,6 +1005,9 @@ static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
                /* Disable Bus load reporting */
                iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_BUS_LOAD_REG);
 
+               can->ioc = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_IOC_REG);
+               kvaser_pciefd_set_led(can, false);
+
                tx_nr_packets_max =
                        FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_MAX_MASK,
                                  ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));