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
flexcan_get_ringparam(struct net_device * ndev,struct ethtool_ringparam * ring,struct kernel_ethtool_ringparam * kernel_ring,struct netlink_ext_ack * ext_ack)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
flexcan_get_strings(struct net_device * ndev,u32 stringset,u8 * data)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
flexcan_get_priv_flags(struct net_device * ndev)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
flexcan_set_priv_flags(struct net_device * ndev,u32 priv_flags)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
flexcan_get_sset_count(struct net_device * netdev,int sset)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 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 .get_ts_info = ethtool_op_get_ts_info,
110 };
111