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[linux.git] / drivers / net / dsa / mv88e6xxx / phy.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Marvell 88e6xxx Ethernet switch PHY and PPU support
4  *
5  * Copyright (c) 2008 Marvell Semiconductor
6  *
7  * Copyright (c) 2017 Andrew Lunn <[email protected]>
8  */
9
10 #include <linux/mdio.h>
11 #include <linux/module.h>
12
13 #include "chip.h"
14 #include "phy.h"
15
16 int mv88e6165_phy_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
17                        int addr, int reg, u16 *val)
18 {
19         return mv88e6xxx_read(chip, addr, reg, val);
20 }
21
22 int mv88e6165_phy_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
23                         int addr, int reg, u16 val)
24 {
25         return mv88e6xxx_write(chip, addr, reg, val);
26 }
27
28 int mv88e6xxx_phy_read(struct mv88e6xxx_chip *chip, int phy, int reg, u16 *val)
29 {
30         int addr = phy; /* PHY devices addresses start at 0x0 */
31         struct mii_bus *bus;
32
33         bus = mv88e6xxx_default_mdio_bus(chip);
34         if (!bus)
35                 return -EOPNOTSUPP;
36
37         if (!chip->info->ops->phy_read)
38                 return -EOPNOTSUPP;
39
40         return chip->info->ops->phy_read(chip, bus, addr, reg, val);
41 }
42
43 int mv88e6xxx_phy_write(struct mv88e6xxx_chip *chip, int phy, int reg, u16 val)
44 {
45         int addr = phy; /* PHY devices addresses start at 0x0 */
46         struct mii_bus *bus;
47
48         bus = mv88e6xxx_default_mdio_bus(chip);
49         if (!bus)
50                 return -EOPNOTSUPP;
51
52         if (!chip->info->ops->phy_write)
53                 return -EOPNOTSUPP;
54
55         return chip->info->ops->phy_write(chip, bus, addr, reg, val);
56 }
57
58 int mv88e6xxx_phy_read_c45(struct mv88e6xxx_chip *chip, int phy, int devad,
59                            int reg, u16 *val)
60 {
61         int addr = phy; /* PHY devices addresses start at 0x0 */
62         struct mii_bus *bus;
63
64         bus = mv88e6xxx_default_mdio_bus(chip);
65         if (!bus)
66                 return -EOPNOTSUPP;
67
68         if (!chip->info->ops->phy_read_c45)
69                 return -EOPNOTSUPP;
70
71         return chip->info->ops->phy_read_c45(chip, bus, addr, devad, reg, val);
72 }
73
74 int mv88e6xxx_phy_write_c45(struct mv88e6xxx_chip *chip, int phy, int devad,
75                             int reg, u16 val)
76 {
77         int addr = phy; /* PHY devices addresses start at 0x0 */
78         struct mii_bus *bus;
79
80         bus = mv88e6xxx_default_mdio_bus(chip);
81         if (!bus)
82                 return -EOPNOTSUPP;
83
84         if (!chip->info->ops->phy_write_c45)
85                 return -EOPNOTSUPP;
86
87         return chip->info->ops->phy_write_c45(chip, bus, addr, devad, reg, val);
88 }
89
90 static int mv88e6xxx_phy_page_get(struct mv88e6xxx_chip *chip, int phy, u8 page)
91 {
92         return mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page);
93 }
94
95 static void mv88e6xxx_phy_page_put(struct mv88e6xxx_chip *chip, int phy)
96 {
97         int err;
98
99         /* Restore PHY page Copper 0x0 for access via the registered
100          * MDIO bus
101          */
102         err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE,
103                                   MV88E6XXX_PHY_PAGE_COPPER);
104         if (unlikely(err)) {
105                 dev_err(chip->dev,
106                         "failed to restore PHY %d page Copper (%d)\n",
107                         phy, err);
108         }
109 }
110
111 int mv88e6xxx_phy_page_read(struct mv88e6xxx_chip *chip, int phy,
112                             u8 page, int reg, u16 *val)
113 {
114         int err;
115
116         /* There is no paging for registers 22 */
117         if (reg == MV88E6XXX_PHY_PAGE)
118                 return -EINVAL;
119
120         err = mv88e6xxx_phy_page_get(chip, phy, page);
121         if (!err) {
122                 err = mv88e6xxx_phy_read(chip, phy, reg, val);
123                 mv88e6xxx_phy_page_put(chip, phy);
124         }
125
126         return err;
127 }
128
129 int mv88e6xxx_phy_page_write(struct mv88e6xxx_chip *chip, int phy,
130                              u8 page, int reg, u16 val)
131 {
132         int err;
133
134         /* There is no paging for registers 22 */
135         if (reg == MV88E6XXX_PHY_PAGE)
136                 return -EINVAL;
137
138         err = mv88e6xxx_phy_page_get(chip, phy, page);
139         if (!err) {
140                 err = mv88e6xxx_phy_write(chip, phy, MV88E6XXX_PHY_PAGE, page);
141                 if (!err)
142                         err = mv88e6xxx_phy_write(chip, phy, reg, val);
143
144                 mv88e6xxx_phy_page_put(chip, phy);
145         }
146
147         return err;
148 }
149
150 static int mv88e6xxx_phy_ppu_disable(struct mv88e6xxx_chip *chip)
151 {
152         if (!chip->info->ops->ppu_disable)
153                 return 0;
154
155         return chip->info->ops->ppu_disable(chip);
156 }
157
158 static int mv88e6xxx_phy_ppu_enable(struct mv88e6xxx_chip *chip)
159 {
160         if (!chip->info->ops->ppu_enable)
161                 return 0;
162
163         return chip->info->ops->ppu_enable(chip);
164 }
165
166 static void mv88e6xxx_phy_ppu_reenable_work(struct work_struct *ugly)
167 {
168         struct mv88e6xxx_chip *chip;
169
170         chip = container_of(ugly, struct mv88e6xxx_chip, ppu_work);
171
172         mv88e6xxx_reg_lock(chip);
173
174         if (mutex_trylock(&chip->ppu_mutex)) {
175                 if (mv88e6xxx_phy_ppu_enable(chip) == 0)
176                         chip->ppu_disabled = 0;
177                 mutex_unlock(&chip->ppu_mutex);
178         }
179
180         mv88e6xxx_reg_unlock(chip);
181 }
182
183 static void mv88e6xxx_phy_ppu_reenable_timer(struct timer_list *t)
184 {
185         struct mv88e6xxx_chip *chip = from_timer(chip, t, ppu_timer);
186
187         schedule_work(&chip->ppu_work);
188 }
189
190 static int mv88e6xxx_phy_ppu_access_get(struct mv88e6xxx_chip *chip)
191 {
192         int ret;
193
194         mutex_lock(&chip->ppu_mutex);
195
196         /* If the PHY polling unit is enabled, disable it so that
197          * we can access the PHY registers.  If it was already
198          * disabled, cancel the timer that is going to re-enable
199          * it.
200          */
201         if (!chip->ppu_disabled) {
202                 ret = mv88e6xxx_phy_ppu_disable(chip);
203                 if (ret < 0) {
204                         mutex_unlock(&chip->ppu_mutex);
205                         return ret;
206                 }
207                 chip->ppu_disabled = 1;
208         } else {
209                 del_timer(&chip->ppu_timer);
210                 ret = 0;
211         }
212
213         return ret;
214 }
215
216 static void mv88e6xxx_phy_ppu_access_put(struct mv88e6xxx_chip *chip)
217 {
218         /* Schedule a timer to re-enable the PHY polling unit. */
219         mod_timer(&chip->ppu_timer, jiffies + msecs_to_jiffies(10));
220         mutex_unlock(&chip->ppu_mutex);
221 }
222
223 static void mv88e6xxx_phy_ppu_state_init(struct mv88e6xxx_chip *chip)
224 {
225         mutex_init(&chip->ppu_mutex);
226         INIT_WORK(&chip->ppu_work, mv88e6xxx_phy_ppu_reenable_work);
227         timer_setup(&chip->ppu_timer, mv88e6xxx_phy_ppu_reenable_timer, 0);
228 }
229
230 static void mv88e6xxx_phy_ppu_state_destroy(struct mv88e6xxx_chip *chip)
231 {
232         del_timer_sync(&chip->ppu_timer);
233 }
234
235 int mv88e6185_phy_ppu_read(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
236                            int addr, int reg, u16 *val)
237 {
238         int err;
239
240         err = mv88e6xxx_phy_ppu_access_get(chip);
241         if (!err) {
242                 err = mv88e6xxx_read(chip, addr, reg, val);
243                 mv88e6xxx_phy_ppu_access_put(chip);
244         }
245
246         return err;
247 }
248
249 int mv88e6185_phy_ppu_write(struct mv88e6xxx_chip *chip, struct mii_bus *bus,
250                             int addr, int reg, u16 val)
251 {
252         int err;
253
254         err = mv88e6xxx_phy_ppu_access_get(chip);
255         if (!err) {
256                 err = mv88e6xxx_write(chip, addr, reg, val);
257                 mv88e6xxx_phy_ppu_access_put(chip);
258         }
259
260         return err;
261 }
262
263 void mv88e6xxx_phy_init(struct mv88e6xxx_chip *chip)
264 {
265         if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
266                 mv88e6xxx_phy_ppu_state_init(chip);
267 }
268
269 void mv88e6xxx_phy_destroy(struct mv88e6xxx_chip *chip)
270 {
271         if (chip->info->ops->ppu_enable && chip->info->ops->ppu_disable)
272                 mv88e6xxx_phy_ppu_state_destroy(chip);
273 }
274
275 int mv88e6xxx_phy_setup(struct mv88e6xxx_chip *chip)
276 {
277         return mv88e6xxx_phy_ppu_enable(chip);
278 }
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