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
15static const char flexcan_priv_flags_strings[][ETH_GSTRING_LEN] = {
16#define FLEXCAN_PRIV_FLAGS_RX_RTR BIT(0)
17	"rx-rtr",
18};
19
20static void
21flexcan_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
40static void
41flexcan_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
50static 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
61static 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
93static 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
103const 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