]> Git Repo - linux.git/blob - drivers/net/mdio/fwnode_mdio.c
block: add a sanity check for non-write flush/fua bios
[linux.git] / drivers / net / mdio / fwnode_mdio.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * fwnode helpers for the MDIO (Ethernet PHY) API
4  *
5  * This file provides helper functions for extracting PHY device information
6  * out of the fwnode and using it to populate an mii_bus.
7  */
8
9 #include <linux/acpi.h>
10 #include <linux/fwnode_mdio.h>
11 #include <linux/of.h>
12 #include <linux/phy.h>
13 #include <linux/pse-pd/pse.h>
14
15 MODULE_AUTHOR("Calvin Johnson <[email protected]>");
16 MODULE_LICENSE("GPL");
17
18 static struct pse_control *
19 fwnode_find_pse_control(struct fwnode_handle *fwnode)
20 {
21         struct pse_control *psec;
22         struct device_node *np;
23
24         if (!IS_ENABLED(CONFIG_PSE_CONTROLLER))
25                 return NULL;
26
27         np = to_of_node(fwnode);
28         if (!np)
29                 return NULL;
30
31         psec = of_pse_control_get(np);
32         if (PTR_ERR(psec) == -ENOENT)
33                 return NULL;
34
35         return psec;
36 }
37
38 static struct mii_timestamper *
39 fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
40 {
41         struct of_phandle_args arg;
42         int err;
43
44         if (is_acpi_node(fwnode))
45                 return NULL;
46
47         err = of_parse_phandle_with_fixed_args(to_of_node(fwnode),
48                                                "timestamper", 1, 0, &arg);
49         if (err == -ENOENT)
50                 return NULL;
51         else if (err)
52                 return ERR_PTR(err);
53
54         if (arg.args_count != 1)
55                 return ERR_PTR(-EINVAL);
56
57         return register_mii_timestamper(arg.np, arg.args[0]);
58 }
59
60 int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
61                                        struct phy_device *phy,
62                                        struct fwnode_handle *child, u32 addr)
63 {
64         int rc;
65
66         rc = fwnode_irq_get(child, 0);
67         /* Don't wait forever if the IRQ provider doesn't become available,
68          * just fall back to poll mode
69          */
70         if (rc == -EPROBE_DEFER)
71                 rc = driver_deferred_probe_check_state(&phy->mdio.dev);
72         if (rc == -EPROBE_DEFER)
73                 return rc;
74
75         if (rc > 0) {
76                 phy->irq = rc;
77                 mdio->irq[addr] = rc;
78         } else {
79                 phy->irq = mdio->irq[addr];
80         }
81
82         if (fwnode_property_read_bool(child, "broken-turn-around"))
83                 mdio->phy_ignore_ta_mask |= 1 << addr;
84
85         fwnode_property_read_u32(child, "reset-assert-us",
86                                  &phy->mdio.reset_assert_delay);
87         fwnode_property_read_u32(child, "reset-deassert-us",
88                                  &phy->mdio.reset_deassert_delay);
89
90         /* Associate the fwnode with the device structure so it
91          * can be looked up later
92          */
93         fwnode_handle_get(child);
94         device_set_node(&phy->mdio.dev, child);
95
96         /* All data is now stored in the phy struct;
97          * register it
98          */
99         rc = phy_device_register(phy);
100         if (rc) {
101                 device_set_node(&phy->mdio.dev, NULL);
102                 fwnode_handle_put(child);
103                 return rc;
104         }
105
106         dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n",
107                 child, addr);
108         return 0;
109 }
110 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register);
111
112 int fwnode_mdiobus_register_phy(struct mii_bus *bus,
113                                 struct fwnode_handle *child, u32 addr)
114 {
115         struct mii_timestamper *mii_ts = NULL;
116         struct pse_control *psec = NULL;
117         struct phy_device *phy;
118         bool is_c45 = false;
119         u32 phy_id;
120         int rc;
121
122         psec = fwnode_find_pse_control(child);
123         if (IS_ERR(psec))
124                 return PTR_ERR(psec);
125
126         mii_ts = fwnode_find_mii_timestamper(child);
127         if (IS_ERR(mii_ts)) {
128                 rc = PTR_ERR(mii_ts);
129                 goto clean_pse;
130         }
131
132         rc = fwnode_property_match_string(child, "compatible",
133                                           "ethernet-phy-ieee802.3-c45");
134         if (rc >= 0)
135                 is_c45 = true;
136
137         if (is_c45 || fwnode_get_phy_id(child, &phy_id))
138                 phy = get_phy_device(bus, addr, is_c45);
139         else
140                 phy = phy_device_create(bus, addr, phy_id, 0, NULL);
141         if (IS_ERR(phy)) {
142                 rc = PTR_ERR(phy);
143                 goto clean_mii_ts;
144         }
145
146         if (is_acpi_node(child)) {
147                 phy->irq = bus->irq[addr];
148
149                 /* Associate the fwnode with the device structure so it
150                  * can be looked up later.
151                  */
152                 phy->mdio.dev.fwnode = fwnode_handle_get(child);
153
154                 /* All data is now stored in the phy struct, so register it */
155                 rc = phy_device_register(phy);
156                 if (rc) {
157                         phy->mdio.dev.fwnode = NULL;
158                         fwnode_handle_put(child);
159                         goto clean_phy;
160                 }
161         } else if (is_of_node(child)) {
162                 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr);
163                 if (rc)
164                         goto clean_phy;
165         }
166
167         phy->psec = psec;
168
169         /* phy->mii_ts may already be defined by the PHY driver. A
170          * mii_timestamper probed via the device tree will still have
171          * precedence.
172          */
173         if (mii_ts)
174                 phy->mii_ts = mii_ts;
175
176         return 0;
177
178 clean_phy:
179         phy_device_free(phy);
180 clean_mii_ts:
181         unregister_mii_timestamper(mii_ts);
182 clean_pse:
183         pse_control_put(psec);
184
185         return rc;
186 }
187 EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
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