1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Copyright (c) 2022 Amarula Solutions, Dario Binacchi <dario.binacchi@amarulasolutions.com> 3 * Copyright (c) 2022 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de> 4 * 5 */ 6 7 #include <linux/can/dev.h> 8 #include <linux/ethtool.h> 9 #include <linux/kernel.h> 10 #include <linux/netdevice.h> 11 #include <linux/platform_device.h> 12 13 #include "flexcan.h" 14 15 static const char flexcan_priv_flags_strings[][ETH_GSTRING_LEN] = { 16 #define FLEXCAN_PRIV_FLAGS_RX_RTR BIT(0) 17 "rx-rtr", 18 }; 19 20 static void 21 flexcan_get_ringparam(struct net_device *ndev, struct ethtool_ringparam *ring, 22 struct kernel_ethtool_ringparam *kernel_ring, 23 struct netlink_ext_ack *ext_ack) 24 { 25 const struct flexcan_priv *priv = netdev_priv(ndev); 26 27 ring->rx_max_pending = priv->mb_count; 28 ring->tx_max_pending = priv->mb_count; 29 30 if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX) 31 ring->rx_pending = priv->offload.mb_last - 32 priv->offload.mb_first + 1; 33 else 34 ring->rx_pending = 6; /* RX-FIFO depth is fixed */ 35 36 /* the drive currently supports only on TX buffer */ 37 ring->tx_pending = 1; 38 } 39 40 static void 41 flexcan_get_strings(struct net_device *ndev, u32 stringset, u8 *data) 42 { 43 switch (stringset) { 44 case ETH_SS_PRIV_FLAGS: 45 memcpy(data, flexcan_priv_flags_strings, 46 sizeof(flexcan_priv_flags_strings)); 47 } 48 } 49 50 static u32 flexcan_get_priv_flags(struct net_device *ndev) 51 { 52 const struct flexcan_priv *priv = netdev_priv(ndev); 53 u32 priv_flags = 0; 54 55 if (flexcan_active_rx_rtr(priv)) 56 priv_flags |= FLEXCAN_PRIV_FLAGS_RX_RTR; 57 58 return priv_flags; 59 } 60 61 static int flexcan_set_priv_flags(struct net_device *ndev, u32 priv_flags) 62 { 63 struct flexcan_priv *priv = netdev_priv(ndev); 64 u32 quirks = priv->devtype_data.quirks; 65 66 if (priv_flags & FLEXCAN_PRIV_FLAGS_RX_RTR) { 67 if (flexcan_supports_rx_mailbox_rtr(priv)) 68 quirks |= FLEXCAN_QUIRK_USE_RX_MAILBOX; 69 else if (flexcan_supports_rx_fifo(priv)) 70 quirks &= ~FLEXCAN_QUIRK_USE_RX_MAILBOX; 71 else 72 quirks |= FLEXCAN_QUIRK_USE_RX_MAILBOX; 73 } else { 74 if (flexcan_supports_rx_mailbox(priv)) 75 quirks |= FLEXCAN_QUIRK_USE_RX_MAILBOX; 76 else 77 quirks &= ~FLEXCAN_QUIRK_USE_RX_MAILBOX; 78 } 79 80 if (quirks != priv->devtype_data.quirks && netif_running(ndev)) 81 return -EBUSY; 82 83 priv->devtype_data.quirks = quirks; 84 85 if (!(priv_flags & FLEXCAN_PRIV_FLAGS_RX_RTR) && 86 !flexcan_active_rx_rtr(priv)) 87 netdev_info(ndev, 88 "Activating RX mailbox mode, cannot receive RTR frames.\n"); 89 90 return 0; 91 } 92 93 static int flexcan_get_sset_count(struct net_device *netdev, int sset) 94 { 95 switch (sset) { 96 case ETH_SS_PRIV_FLAGS: 97 return ARRAY_SIZE(flexcan_priv_flags_strings); 98 default: 99 return -EOPNOTSUPP; 100 } 101 } 102 103 static const struct ethtool_ops flexcan_ethtool_ops = { 104 .get_ringparam = flexcan_get_ringparam, 105 .get_strings = flexcan_get_strings, 106 .get_priv_flags = flexcan_get_priv_flags, 107 .set_priv_flags = flexcan_set_priv_flags, 108 .get_sset_count = flexcan_get_sset_count, 109 }; 110 111 void flexcan_set_ethtool_ops(struct net_device *netdev) 112 { 113 netdev->ethtool_ops = &flexcan_ethtool_ops; 114 } 115