1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Northstar Plus switch SerDes/SGMII PHY main logic
4 *
5 * Copyright (C) 2018 Florian Fainelli <f.fainelli@gmail.com>
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/delay.h>
11#include <linux/kernel.h>
12#include <linux/phy.h>
13#include <linux/phylink.h>
14#include <net/dsa.h>
15
16#include "b53_priv.h"
17#include "b53_serdes.h"
18#include "b53_regs.h"
19
20static inline struct b53_pcs *pcs_to_b53_pcs(struct phylink_pcs *pcs)
21{
22 return container_of(pcs, struct b53_pcs, pcs);
23}
24
25static void b53_serdes_write_blk(struct b53_device *dev, u8 offset, u16 block,
26 u16 value)
27{
28 b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, val: block);
29 b53_write16(dev, B53_SERDES_PAGE, reg: offset, val: value);
30}
31
32static u16 b53_serdes_read_blk(struct b53_device *dev, u8 offset, u16 block)
33{
34 u16 value;
35
36 b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, val: block);
37 b53_read16(dev, B53_SERDES_PAGE, reg: offset, val: &value);
38
39 return value;
40}
41
42static void b53_serdes_set_lane(struct b53_device *dev, u8 lane)
43{
44 if (dev->serdes_lane == lane)
45 return;
46
47 WARN_ON(lane > 1);
48
49 b53_serdes_write_blk(dev, B53_SERDES_LANE,
50 SERDES_XGXSBLK0_BLOCKADDRESS, value: lane);
51 dev->serdes_lane = lane;
52}
53
54static void b53_serdes_write(struct b53_device *dev, u8 lane,
55 u8 offset, u16 block, u16 value)
56{
57 b53_serdes_set_lane(dev, lane);
58 b53_serdes_write_blk(dev, offset, block, value);
59}
60
61static u16 b53_serdes_read(struct b53_device *dev, u8 lane,
62 u8 offset, u16 block)
63{
64 b53_serdes_set_lane(dev, lane);
65 return b53_serdes_read_blk(dev, offset, block);
66}
67
68static int b53_serdes_config(struct phylink_pcs *pcs, unsigned int neg_mode,
69 phy_interface_t interface,
70 const unsigned long *advertising,
71 bool permit_pause_to_mac)
72{
73 struct b53_device *dev = pcs_to_b53_pcs(pcs)->dev;
74 u8 lane = pcs_to_b53_pcs(pcs)->lane;
75 u16 reg;
76
77 reg = b53_serdes_read(dev, lane, B53_SERDES_DIGITAL_CONTROL(1),
78 SERDES_DIGITAL_BLK);
79 if (interface == PHY_INTERFACE_MODE_1000BASEX)
80 reg |= FIBER_MODE_1000X;
81 else
82 reg &= ~FIBER_MODE_1000X;
83 b53_serdes_write(dev, lane, B53_SERDES_DIGITAL_CONTROL(1),
84 SERDES_DIGITAL_BLK, value: reg);
85
86 return 0;
87}
88
89static void b53_serdes_an_restart(struct phylink_pcs *pcs)
90{
91 struct b53_device *dev = pcs_to_b53_pcs(pcs)->dev;
92 u8 lane = pcs_to_b53_pcs(pcs)->lane;
93 u16 reg;
94
95 reg = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
96 SERDES_MII_BLK);
97 reg |= BMCR_ANRESTART;
98 b53_serdes_write(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
99 SERDES_MII_BLK, value: reg);
100}
101
102static void b53_serdes_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
103 struct phylink_link_state *state)
104{
105 struct b53_device *dev = pcs_to_b53_pcs(pcs)->dev;
106 u8 lane = pcs_to_b53_pcs(pcs)->lane;
107 u16 dig, bmsr;
108
109 dig = b53_serdes_read(dev, lane, B53_SERDES_DIGITAL_STATUS,
110 SERDES_DIGITAL_BLK);
111 bmsr = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMSR),
112 SERDES_MII_BLK);
113
114 switch ((dig >> SPEED_STATUS_SHIFT) & SPEED_STATUS_MASK) {
115 case SPEED_STATUS_10:
116 state->speed = SPEED_10;
117 break;
118 case SPEED_STATUS_100:
119 state->speed = SPEED_100;
120 break;
121 case SPEED_STATUS_1000:
122 state->speed = SPEED_1000;
123 break;
124 default:
125 case SPEED_STATUS_2500:
126 state->speed = SPEED_2500;
127 break;
128 }
129
130 state->duplex = dig & DUPLEX_STATUS ? DUPLEX_FULL : DUPLEX_HALF;
131 state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
132 state->link = !!(dig & LINK_STATUS);
133 if (dig & PAUSE_RESOLUTION_RX_SIDE)
134 state->pause |= MLO_PAUSE_RX;
135 if (dig & PAUSE_RESOLUTION_TX_SIDE)
136 state->pause |= MLO_PAUSE_TX;
137}
138
139void b53_serdes_link_set(struct b53_device *dev, int port, unsigned int mode,
140 phy_interface_t interface, bool link_up)
141{
142 u8 lane = b53_serdes_map_lane(dev, port);
143 u16 reg;
144
145 if (lane == B53_INVALID_LANE)
146 return;
147
148 reg = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
149 SERDES_MII_BLK);
150 if (link_up)
151 reg &= ~BMCR_PDOWN;
152 else
153 reg |= BMCR_PDOWN;
154 b53_serdes_write(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
155 SERDES_MII_BLK, value: reg);
156}
157EXPORT_SYMBOL(b53_serdes_link_set);
158
159static const struct phylink_pcs_ops b53_pcs_ops = {
160 .pcs_get_state = b53_serdes_get_state,
161 .pcs_config = b53_serdes_config,
162 .pcs_an_restart = b53_serdes_an_restart,
163};
164
165void b53_serdes_phylink_get_caps(struct b53_device *dev, int port,
166 struct phylink_config *config)
167{
168 u8 lane = b53_serdes_map_lane(dev, port);
169
170 if (lane == B53_INVALID_LANE)
171 return;
172
173 switch (lane) {
174 case 0:
175 /* It appears lane 0 supports 2500base-X and 1000base-X */
176 __set_bit(PHY_INTERFACE_MODE_2500BASEX,
177 config->supported_interfaces);
178 config->mac_capabilities |= MAC_2500FD;
179 fallthrough;
180 case 1:
181 /* It appears lane 1 only supports 1000base-X and SGMII */
182 __set_bit(PHY_INTERFACE_MODE_1000BASEX,
183 config->supported_interfaces);
184 __set_bit(PHY_INTERFACE_MODE_SGMII,
185 config->supported_interfaces);
186 config->mac_capabilities |= MAC_1000FD;
187 break;
188 default:
189 break;
190 }
191}
192EXPORT_SYMBOL(b53_serdes_phylink_get_caps);
193
194struct phylink_pcs *b53_serdes_phylink_mac_select_pcs(struct b53_device *dev,
195 int port,
196 phy_interface_t interface)
197{
198 u8 lane = b53_serdes_map_lane(dev, port);
199
200 if (lane == B53_INVALID_LANE || lane >= B53_N_PCS ||
201 !dev->pcs[lane].dev)
202 return NULL;
203
204 if (!phy_interface_mode_is_8023z(mode: interface) &&
205 interface != PHY_INTERFACE_MODE_SGMII)
206 return NULL;
207
208 return &dev->pcs[lane].pcs;
209}
210EXPORT_SYMBOL(b53_serdes_phylink_mac_select_pcs);
211
212int b53_serdes_init(struct b53_device *dev, int port)
213{
214 u8 lane = b53_serdes_map_lane(dev, port);
215 struct b53_pcs *pcs;
216 u16 id0, msb, lsb;
217
218 if (lane == B53_INVALID_LANE)
219 return -EINVAL;
220
221 id0 = b53_serdes_read(dev, lane, B53_SERDES_ID0, SERDES_ID0);
222 msb = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_PHYSID1),
223 SERDES_MII_BLK);
224 lsb = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_PHYSID2),
225 SERDES_MII_BLK);
226 if (id0 == 0 || id0 == 0xffff) {
227 dev_err(dev->dev, "SerDes not initialized, check settings\n");
228 return -ENODEV;
229 }
230
231 dev_info(dev->dev,
232 "SerDes lane %d, model: %d, rev %c%d (OUI: 0x%08x)\n",
233 lane, id0 & SERDES_ID0_MODEL_MASK,
234 (id0 >> SERDES_ID0_REV_LETTER_SHIFT) + 0x41,
235 (id0 >> SERDES_ID0_REV_NUM_SHIFT) & SERDES_ID0_REV_NUM_MASK,
236 (u32)msb << 16 | lsb);
237
238 pcs = &dev->pcs[lane];
239 pcs->dev = dev;
240 pcs->lane = lane;
241 pcs->pcs.ops = &b53_pcs_ops;
242
243 return 0;
244}
245EXPORT_SYMBOL(b53_serdes_init);
246
247MODULE_AUTHOR("Florian Fainelli <f.fainelli@gmail.com>");
248MODULE_DESCRIPTION("B53 Switch SerDes driver");
249MODULE_LICENSE("Dual BSD/GPL");
250

source code of linux/drivers/net/dsa/b53/b53_serdes.c