Merge branch 'fix/hda' of git://github.com/tiwai/sound
[pandora-kernel.git] / drivers / net / phy / national.c
1 /*
2  * drivers/net/phy/national.c
3  *
4  * Driver for National Semiconductor PHYs
5  *
6  * Author: Stuart Menefy <stuart.menefy@st.com>
7  * Maintainer: Giuseppe Cavallaro <peppe.cavallaro@st.com>
8  *
9  * Copyright (c) 2008 STMicroelectronics Limited
10  *
11  * This program is free software; you can redistribute  it and/or modify it
12  * under  the terms of  the GNU General  Public License as published by the
13  * Free Software Foundation;  either version 2 of the  License, or (at your
14  * option) any later version.
15  *
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/mii.h>
21 #include <linux/ethtool.h>
22 #include <linux/phy.h>
23 #include <linux/netdevice.h>
24
25 /* DP83865 phy identifier values */
26 #define DP83865_PHY_ID  0x20005c7a
27
28 #define DP83865_INT_STATUS      0x14
29 #define DP83865_INT_MASK        0x15
30 #define DP83865_INT_CLEAR       0x17
31
32 #define DP83865_INT_REMOTE_FAULT 0x0008
33 #define DP83865_INT_ANE_COMPLETED 0x0010
34 #define DP83865_INT_LINK_CHANGE 0xe000
35 #define DP83865_INT_MASK_DEFAULT (DP83865_INT_REMOTE_FAULT | \
36                                 DP83865_INT_ANE_COMPLETED | \
37                                 DP83865_INT_LINK_CHANGE)
38
39 /* Advanced proprietary configuration */
40 #define NS_EXP_MEM_CTL  0x16
41 #define NS_EXP_MEM_DATA 0x1d
42 #define NS_EXP_MEM_ADD  0x1e
43
44 #define LED_CTRL_REG 0x13
45 #define AN_FALLBACK_AN 0x0001
46 #define AN_FALLBACK_CRC 0x0002
47 #define AN_FALLBACK_IE 0x0004
48 #define ALL_FALLBACK_ON (AN_FALLBACK_AN |  AN_FALLBACK_CRC | AN_FALLBACK_IE)
49
50 enum hdx_loopback {
51         hdx_loopback_on = 0,
52         hdx_loopback_off = 1,
53 };
54
55 static u8 ns_exp_read(struct phy_device *phydev, u16 reg)
56 {
57         phy_write(phydev, NS_EXP_MEM_ADD, reg);
58         return phy_read(phydev, NS_EXP_MEM_DATA);
59 }
60
61 static void ns_exp_write(struct phy_device *phydev, u16 reg, u8 data)
62 {
63         phy_write(phydev, NS_EXP_MEM_ADD, reg);
64         phy_write(phydev, NS_EXP_MEM_DATA, data);
65 }
66
67 static int ns_config_intr(struct phy_device *phydev)
68 {
69         int err;
70
71         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
72                 err = phy_write(phydev, DP83865_INT_MASK,
73                                 DP83865_INT_MASK_DEFAULT);
74         else
75                 err = phy_write(phydev, DP83865_INT_MASK, 0);
76
77         return err;
78 }
79
80 static int ns_ack_interrupt(struct phy_device *phydev)
81 {
82         int ret = phy_read(phydev, DP83865_INT_STATUS);
83         if (ret < 0)
84                 return ret;
85
86         /* Clear the interrupt status bit by writing a “1”
87          * to the corresponding bit in INT_CLEAR (2:0 are reserved) */
88         ret = phy_write(phydev, DP83865_INT_CLEAR, ret & ~0x7);
89
90         return ret;
91 }
92
93 static void ns_giga_speed_fallback(struct phy_device *phydev, int mode)
94 {
95         int bmcr = phy_read(phydev, MII_BMCR);
96
97         phy_write(phydev, MII_BMCR, (bmcr | BMCR_PDOWN));
98
99         /* Enable 8 bit expended memory read/write (no auto increment) */
100         phy_write(phydev, NS_EXP_MEM_CTL, 0);
101         phy_write(phydev, NS_EXP_MEM_ADD, 0x1C0);
102         phy_write(phydev, NS_EXP_MEM_DATA, 0x0008);
103         phy_write(phydev, MII_BMCR, (bmcr & ~BMCR_PDOWN));
104         phy_write(phydev, LED_CTRL_REG, mode);
105 }
106
107 static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable)
108 {
109         if (disable)
110                 ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1);
111         else
112                 ns_exp_write(phydev, 0x1c0,
113                              ns_exp_read(phydev, 0x1c0) & 0xfffe);
114
115         printk(KERN_DEBUG "DP83865 PHY: 10BASE-T HDX loopback %s\n",
116                (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on");
117 }
118
119 static int ns_config_init(struct phy_device *phydev)
120 {
121         ns_giga_speed_fallback(phydev, ALL_FALLBACK_ON);
122         /* In the latest MAC or switches design, the 10 Mbps loopback
123            is desired to be turned off. */
124         ns_10_base_t_hdx_loopack(phydev, hdx_loopback_off);
125         return ns_ack_interrupt(phydev);
126 }
127
128 static struct phy_driver dp83865_driver = {
129         .phy_id = DP83865_PHY_ID,
130         .phy_id_mask = 0xfffffff0,
131         .name = "NatSemi DP83865",
132         .features = PHY_GBIT_FEATURES | SUPPORTED_Pause | SUPPORTED_Asym_Pause,
133         .flags = PHY_HAS_INTERRUPT,
134         .config_init = ns_config_init,
135         .config_aneg = genphy_config_aneg,
136         .read_status = genphy_read_status,
137         .ack_interrupt = ns_ack_interrupt,
138         .config_intr = ns_config_intr,
139         .driver = {.owner = THIS_MODULE,}
140 };
141
142 static int __init ns_init(void)
143 {
144         return phy_driver_register(&dp83865_driver);
145 }
146
147 static void __exit ns_exit(void)
148 {
149         phy_driver_unregister(&dp83865_driver);
150 }
151
152 MODULE_DESCRIPTION("NatSemi PHY driver");
153 MODULE_AUTHOR("Stuart Menefy");
154 MODULE_LICENSE("GPL");
155
156 module_init(ns_init);
157 module_exit(ns_exit);
158
159 static struct mdio_device_id __maybe_unused ns_tbl[] = {
160         { DP83865_PHY_ID, 0xfffffff0 },
161         { }
162 };
163
164 MODULE_DEVICE_TABLE(mdio, ns_tbl);