Merge branch 'x86/setup' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux...
[linux-2.6] / 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_MASK_REG 0x15
29 #define DP83865_INT_MASK_STATUS 0x14
30
31 #define DP83865_INT_REMOTE_FAULT 0x0008
32 #define DP83865_INT_ANE_COMPLETED 0x0010
33 #define DP83865_INT_LINK_CHANGE 0xe000
34 #define DP83865_INT_MASK_DEFAULT (DP83865_INT_REMOTE_FAULT | \
35                                 DP83865_INT_ANE_COMPLETED | \
36                                 DP83865_INT_LINK_CHANGE)
37
38 /* Advanced proprietary configuration */
39 #define NS_EXP_MEM_CTL  0x16
40 #define NS_EXP_MEM_DATA 0x1d
41 #define NS_EXP_MEM_ADD  0x1e
42
43 #define LED_CTRL_REG 0x13
44 #define AN_FALLBACK_AN 0x0001
45 #define AN_FALLBACK_CRC 0x0002
46 #define AN_FALLBACK_IE 0x0004
47 #define ALL_FALLBACK_ON (AN_FALLBACK_AN |  AN_FALLBACK_CRC | AN_FALLBACK_IE)
48
49 enum hdx_loopback {
50         hdx_loopback_on = 0,
51         hdx_loopback_off = 1,
52 };
53
54 static u8 ns_exp_read(struct phy_device *phydev, u16 reg)
55 {
56         phy_write(phydev, NS_EXP_MEM_ADD, reg);
57         return phy_read(phydev, NS_EXP_MEM_DATA);
58 }
59
60 static void ns_exp_write(struct phy_device *phydev, u16 reg, u8 data)
61 {
62         phy_write(phydev, NS_EXP_MEM_ADD, reg);
63         phy_write(phydev, NS_EXP_MEM_DATA, data);
64 }
65
66 static int ns_config_intr(struct phy_device *phydev)
67 {
68         int err;
69
70         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
71                 err = phy_write(phydev, DP83865_INT_MASK_REG,
72                                 DP83865_INT_MASK_DEFAULT);
73         else
74                 err = phy_write(phydev, DP83865_INT_MASK_REG, 0);
75
76         return err;
77 }
78
79 static int ns_ack_interrupt(struct phy_device *phydev)
80 {
81         int ret = phy_read(phydev, DP83865_INT_MASK_STATUS);
82         if (ret < 0)
83                 return ret;
84
85         return 0;
86 }
87
88 static void ns_giga_speed_fallback(struct phy_device *phydev, int mode)
89 {
90         int bmcr = phy_read(phydev, MII_BMCR);
91
92         phy_write(phydev, MII_BMCR, (bmcr | BMCR_PDOWN));
93
94         /* Enable 8 bit expended memory read/write (no auto increment) */
95         phy_write(phydev, NS_EXP_MEM_CTL, 0);
96         phy_write(phydev, NS_EXP_MEM_ADD, 0x1C0);
97         phy_write(phydev, NS_EXP_MEM_DATA, 0x0008);
98         phy_write(phydev, MII_BMCR, (bmcr & ~BMCR_PDOWN));
99         phy_write(phydev, LED_CTRL_REG, mode);
100         return;
101 }
102
103 static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable)
104 {
105         if (disable)
106                 ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1);
107         else
108                 ns_exp_write(phydev, 0x1c0,
109                              ns_exp_read(phydev, 0x1c0) & 0xfffe);
110
111         printk(KERN_DEBUG "DP83865 PHY: 10BASE-T HDX loopback %s\n",
112                (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on");
113
114         return;
115 }
116
117 static int ns_config_init(struct phy_device *phydev)
118 {
119         ns_giga_speed_fallback(phydev, ALL_FALLBACK_ON);
120         /* In the latest MAC or switches design, the 10 Mbps loopback
121            is desired to be turned off. */
122         ns_10_base_t_hdx_loopack(phydev, hdx_loopback_off);
123         return ns_ack_interrupt(phydev);
124 }
125
126 static struct phy_driver dp83865_driver = {
127         .phy_id = DP83865_PHY_ID,
128         .phy_id_mask = 0xfffffff0,
129         .name = "NatSemi DP83865",
130         .features = PHY_GBIT_FEATURES | SUPPORTED_Pause | SUPPORTED_Asym_Pause,
131         .flags = PHY_HAS_INTERRUPT,
132         .config_init = ns_config_init,
133         .config_aneg = genphy_config_aneg,
134         .read_status = genphy_read_status,
135         .ack_interrupt = ns_ack_interrupt,
136         .config_intr = ns_config_intr,
137         .driver = {.owner = THIS_MODULE,}
138 };
139
140 static int __init ns_init(void)
141 {
142         return phy_driver_register(&dp83865_driver);
143 }
144
145 static void __exit ns_exit(void)
146 {
147         phy_driver_unregister(&dp83865_driver);
148 }
149
150 MODULE_DESCRIPTION("NatSemi PHY driver");
151 MODULE_AUTHOR("Stuart Menefy");
152 MODULE_LICENSE("GPL");
153
154 module_init(ns_init);
155 module_exit(ns_exit);