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7#include <linux/io.h>
8#include <linux/netdevice.h>
9#include <linux/mutex.h>
10#include <linux/phy.h>
11#include <linux/of.h>
12#include <linux/of_device.h>
13#include <linux/of_address.h>
14#include <linux/slab.h>
15#include <linux/of_mdio.h>
16
17#include "ll_temac.h"
18
19
20
21
22static int temac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
23{
24 struct temac_local *lp = bus->priv;
25 u32 rc;
26
27
28
29
30 mutex_lock(&lp->indirect_mutex);
31 temac_iow(lp, XTE_LSW0_OFFSET, (phy_id << 5) | reg);
32 rc = temac_indirect_in32(lp, XTE_MIIMAI_OFFSET);
33 mutex_unlock(&lp->indirect_mutex);
34
35 dev_dbg(lp->dev, "temac_mdio_read(phy_id=%i, reg=%x) == %x\n",
36 phy_id, reg, rc);
37
38 return rc;
39}
40
41static int temac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
42{
43 struct temac_local *lp = bus->priv;
44
45 dev_dbg(lp->dev, "temac_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
46 phy_id, reg, val);
47
48
49
50
51 mutex_lock(&lp->indirect_mutex);
52 temac_indirect_out32(lp, XTE_MGTDR_OFFSET, val);
53 temac_indirect_out32(lp, XTE_MIIMAI_OFFSET, (phy_id << 5) | reg);
54 mutex_unlock(&lp->indirect_mutex);
55
56 return 0;
57}
58
59int temac_mdio_setup(struct temac_local *lp, struct device_node *np)
60{
61 struct mii_bus *bus;
62 u32 bus_hz;
63 int clk_div;
64 int rc;
65 struct resource res;
66 struct device_node *np1 = of_get_parent(lp->phy_node);
67
68
69 clk_div = 0x3f;
70 if (of_property_read_u32(np, "clock-frequency", &bus_hz) == 0) {
71 clk_div = bus_hz / (2500 * 1000 * 2) - 1;
72 if (clk_div < 1)
73 clk_div = 1;
74 if (clk_div > 0x3f)
75 clk_div = 0x3f;
76 }
77
78
79
80 mutex_lock(&lp->indirect_mutex);
81 temac_indirect_out32(lp, XTE_MC_OFFSET, 1 << 6 | clk_div);
82 mutex_unlock(&lp->indirect_mutex);
83
84 bus = mdiobus_alloc();
85 if (!bus)
86 return -ENOMEM;
87
88 of_address_to_resource(np1, 0, &res);
89 snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
90 (unsigned long long)res.start);
91 bus->priv = lp;
92 bus->name = "Xilinx TEMAC MDIO";
93 bus->read = temac_mdio_read;
94 bus->write = temac_mdio_write;
95 bus->parent = lp->dev;
96
97 lp->mii_bus = bus;
98
99 rc = of_mdiobus_register(bus, np1);
100 if (rc)
101 goto err_register;
102
103 mutex_lock(&lp->indirect_mutex);
104 dev_dbg(lp->dev, "MDIO bus registered; MC:%x\n",
105 temac_indirect_in32(lp, XTE_MC_OFFSET));
106 mutex_unlock(&lp->indirect_mutex);
107 return 0;
108
109 err_register:
110 mdiobus_free(bus);
111 return rc;
112}
113
114void temac_mdio_teardown(struct temac_local *lp)
115{
116 mdiobus_unregister(lp->mii_bus);
117 mdiobus_free(lp->mii_bus);
118 lp->mii_bus = NULL;
119}
120
121