1// SPDX-License-Identifier: GPL-2.0+
2/* Microchip Sparx5 Switch driver
3 *
4 * Copyright (c) 2021 Microchip Technology Inc. and its subsidiaries.
5 */
6
7#include <linux/module.h>
8#include <linux/phylink.h>
9#include <linux/device.h>
10#include <linux/netdevice.h>
11#include <linux/sfp.h>
12
13#include "sparx5_main_regs.h"
14#include "sparx5_main.h"
15#include "sparx5_port.h"
16
17static bool port_conf_has_changed(struct sparx5_port_config *a, struct sparx5_port_config *b)
18{
19	if (a->speed != b->speed ||
20	    a->portmode != b->portmode ||
21	    a->autoneg != b->autoneg ||
22	    a->pause_adv != b->pause_adv ||
23	    a->power_down != b->power_down ||
24	    a->media != b->media)
25		return true;
26	return false;
27}
28
29static struct phylink_pcs *
30sparx5_phylink_mac_select_pcs(struct phylink_config *config,
31			      phy_interface_t interface)
32{
33	struct sparx5_port *port = netdev_priv(to_net_dev(config->dev));
34
35	return &port->phylink_pcs;
36}
37
38static void sparx5_phylink_mac_config(struct phylink_config *config,
39				      unsigned int mode,
40				      const struct phylink_link_state *state)
41{
42	/* Currently not used */
43}
44
45static void sparx5_phylink_mac_link_up(struct phylink_config *config,
46				       struct phy_device *phy,
47				       unsigned int mode,
48				       phy_interface_t interface,
49				       int speed, int duplex,
50				       bool tx_pause, bool rx_pause)
51{
52	struct sparx5_port *port = netdev_priv(to_net_dev(config->dev));
53	struct sparx5_port_config conf;
54	int err;
55
56	conf = port->conf;
57	conf.duplex = duplex;
58	conf.pause = 0;
59	conf.pause |= tx_pause ? MLO_PAUSE_TX : 0;
60	conf.pause |= rx_pause ? MLO_PAUSE_RX : 0;
61	conf.speed = speed;
62	/* Configure the port to speed/duplex/pause */
63	err = sparx5_port_config(port->sparx5, port, &conf);
64	if (err)
65		netdev_err(port->ndev, "port config failed: %d\n", err);
66}
67
68static void sparx5_phylink_mac_link_down(struct phylink_config *config,
69					 unsigned int mode,
70					 phy_interface_t interface)
71{
72	/* Currently not used */
73}
74
75static struct sparx5_port *sparx5_pcs_to_port(struct phylink_pcs *pcs)
76{
77	return container_of(pcs, struct sparx5_port, phylink_pcs);
78}
79
80static void sparx5_pcs_get_state(struct phylink_pcs *pcs,
81				 struct phylink_link_state *state)
82{
83	struct sparx5_port *port = sparx5_pcs_to_port(pcs);
84	struct sparx5_port_status status;
85
86	sparx5_get_port_status(port->sparx5, port, &status);
87	state->link = status.link && !status.link_down;
88	state->an_complete = status.an_complete;
89	state->speed = status.speed;
90	state->duplex = status.duplex;
91	state->pause = status.pause;
92}
93
94static int sparx5_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
95			     phy_interface_t interface,
96			     const unsigned long *advertising,
97			     bool permit_pause_to_mac)
98{
99	struct sparx5_port *port = sparx5_pcs_to_port(pcs);
100	struct sparx5_port_config conf;
101	int ret = 0;
102
103	conf = port->conf;
104	conf.power_down = false;
105	conf.portmode = interface;
106	conf.inband = neg_mode == PHYLINK_PCS_NEG_INBAND_DISABLED ||
107		      neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED;
108	conf.autoneg = neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED;
109	conf.pause_adv = 0;
110	if (phylink_test(advertising, Pause))
111		conf.pause_adv |= ADVERTISE_1000XPAUSE;
112	if (phylink_test(advertising, Asym_Pause))
113		conf.pause_adv |= ADVERTISE_1000XPSE_ASYM;
114	if (sparx5_is_baser(interface)) {
115		if (phylink_test(advertising, FIBRE))
116			conf.media = PHY_MEDIA_SR;
117		else
118			conf.media = PHY_MEDIA_DAC;
119	}
120	if (!port_conf_has_changed(&port->conf, &conf))
121		return ret;
122	/* Enable the PCS matching this interface type */
123	ret = sparx5_port_pcs_set(port->sparx5, port, &conf);
124	if (ret)
125		netdev_err(port->ndev, "port PCS config failed: %d\n", ret);
126	return ret;
127}
128
129static void sparx5_pcs_aneg_restart(struct phylink_pcs *pcs)
130{
131	/* Currently not used */
132}
133
134const struct phylink_pcs_ops sparx5_phylink_pcs_ops = {
135	.pcs_get_state = sparx5_pcs_get_state,
136	.pcs_config = sparx5_pcs_config,
137	.pcs_an_restart = sparx5_pcs_aneg_restart,
138};
139
140const struct phylink_mac_ops sparx5_phylink_mac_ops = {
141	.mac_select_pcs = sparx5_phylink_mac_select_pcs,
142	.mac_config = sparx5_phylink_mac_config,
143	.mac_link_down = sparx5_phylink_mac_link_down,
144	.mac_link_up = sparx5_phylink_mac_link_up,
145};
146