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1 | /* |
2 | * drivers/net/gianfar_mii.c | |
3 | * | |
4 | * Gianfar Ethernet Driver -- MIIM bus implementation | |
5 | * Provides Bus interface for MIIM regs | |
6 | * | |
7 | * Author: Andy Fleming | |
8 | * Maintainer: Kumar Gala (kumar.gala@freescale.com) | |
9 | * | |
10 | * Copyright (c) 2002-2004 Freescale Semiconductor, Inc. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/config.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/etherdevice.h> | |
31 | #include <linux/skbuff.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/mm.h> | |
34 | #include <linux/module.h> | |
35 | #include <linux/version.h> | |
36 | #include <asm/ocp.h> | |
37 | #include <linux/crc32.h> | |
38 | #include <linux/mii.h> | |
39 | #include <linux/phy.h> | |
40 | ||
41 | #include <asm/io.h> | |
42 | #include <asm/irq.h> | |
43 | #include <asm/uaccess.h> | |
44 | ||
45 | #include "gianfar.h" | |
46 | #include "gianfar_mii.h" | |
47 | ||
48 | /* Write value to the PHY at mii_id at register regnum, | |
49 | * on the bus, waiting until the write is done before returning. | |
50 | * All PHY configuration is done through the TSEC1 MIIM regs */ | |
51 | int gfar_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) | |
52 | { | |
53 | struct gfar_mii *regs = bus->priv; | |
54 | ||
55 | /* Set the PHY address and the register address we want to write */ | |
56 | gfar_write(®s->miimadd, (mii_id << 8) | regnum); | |
57 | ||
58 | /* Write out the value we want */ | |
59 | gfar_write(®s->miimcon, value); | |
60 | ||
61 | /* Wait for the transaction to finish */ | |
62 | while (gfar_read(®s->miimind) & MIIMIND_BUSY) | |
63 | cpu_relax(); | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | /* Read the bus for PHY at addr mii_id, register regnum, and | |
69 | * return the value. Clears miimcom first. All PHY | |
70 | * configuration has to be done through the TSEC1 MIIM regs */ | |
71 | int gfar_mdio_read(struct mii_bus *bus, int mii_id, int regnum) | |
72 | { | |
73 | struct gfar_mii *regs = bus->priv; | |
74 | u16 value; | |
75 | ||
76 | /* Set the PHY address and the register address we want to read */ | |
77 | gfar_write(®s->miimadd, (mii_id << 8) | regnum); | |
78 | ||
79 | /* Clear miimcom, and then initiate a read */ | |
80 | gfar_write(®s->miimcom, 0); | |
81 | gfar_write(®s->miimcom, MII_READ_COMMAND); | |
82 | ||
83 | /* Wait for the transaction to finish */ | |
84 | while (gfar_read(®s->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY)) | |
85 | cpu_relax(); | |
86 | ||
87 | /* Grab the value of the register from miimstat */ | |
88 | value = gfar_read(®s->miimstat); | |
89 | ||
90 | return value; | |
91 | } | |
92 | ||
93 | ||
94 | /* Reset the MIIM registers, and wait for the bus to free */ | |
95 | int gfar_mdio_reset(struct mii_bus *bus) | |
96 | { | |
97 | struct gfar_mii *regs = bus->priv; | |
98 | unsigned int timeout = PHY_INIT_TIMEOUT; | |
99 | ||
100 | spin_lock_bh(&bus->mdio_lock); | |
101 | ||
102 | /* Reset the management interface */ | |
103 | gfar_write(®s->miimcfg, MIIMCFG_RESET); | |
104 | ||
105 | /* Setup the MII Mgmt clock speed */ | |
106 | gfar_write(®s->miimcfg, MIIMCFG_INIT_VALUE); | |
107 | ||
108 | /* Wait until the bus is free */ | |
109 | while ((gfar_read(®s->miimind) & MIIMIND_BUSY) && | |
110 | timeout--) | |
111 | cpu_relax(); | |
112 | ||
113 | spin_unlock_bh(&bus->mdio_lock); | |
114 | ||
115 | if(timeout <= 0) { | |
116 | printk(KERN_ERR "%s: The MII Bus is stuck!\n", | |
117 | bus->name); | |
118 | return -EBUSY; | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | ||
125 | int gfar_mdio_probe(struct device *dev) | |
126 | { | |
127 | struct platform_device *pdev = to_platform_device(dev); | |
128 | struct gianfar_mdio_data *pdata; | |
129 | struct gfar_mii *regs; | |
130 | struct mii_bus *new_bus; | |
131 | int err = 0; | |
132 | ||
133 | if (NULL == dev) | |
134 | return -EINVAL; | |
135 | ||
136 | new_bus = kmalloc(sizeof(struct mii_bus), GFP_KERNEL); | |
137 | ||
138 | if (NULL == new_bus) | |
139 | return -ENOMEM; | |
140 | ||
141 | new_bus->name = "Gianfar MII Bus", | |
142 | new_bus->read = &gfar_mdio_read, | |
143 | new_bus->write = &gfar_mdio_write, | |
144 | new_bus->reset = &gfar_mdio_reset, | |
145 | new_bus->id = pdev->id; | |
146 | ||
147 | pdata = (struct gianfar_mdio_data *)pdev->dev.platform_data; | |
148 | ||
149 | if (NULL == pdata) { | |
150 | printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id); | |
151 | return -ENODEV; | |
152 | } | |
153 | ||
154 | /* Set the PHY base address */ | |
155 | regs = (struct gfar_mii *) ioremap(pdata->paddr, | |
156 | sizeof (struct gfar_mii)); | |
157 | ||
158 | if (NULL == regs) { | |
159 | err = -ENOMEM; | |
160 | goto reg_map_fail; | |
161 | } | |
162 | ||
163 | new_bus->priv = regs; | |
164 | ||
165 | new_bus->irq = pdata->irq; | |
166 | ||
167 | new_bus->dev = dev; | |
168 | dev_set_drvdata(dev, new_bus); | |
169 | ||
170 | err = mdiobus_register(new_bus); | |
171 | ||
172 | if (0 != err) { | |
173 | printk (KERN_ERR "%s: Cannot register as MDIO bus\n", | |
174 | new_bus->name); | |
175 | goto bus_register_fail; | |
176 | } | |
177 | ||
178 | return 0; | |
179 | ||
180 | bus_register_fail: | |
181 | iounmap((void *) regs); | |
182 | reg_map_fail: | |
183 | kfree(new_bus); | |
184 | ||
185 | return err; | |
186 | } | |
187 | ||
188 | ||
189 | int gfar_mdio_remove(struct device *dev) | |
190 | { | |
191 | struct mii_bus *bus = dev_get_drvdata(dev); | |
192 | ||
193 | mdiobus_unregister(bus); | |
194 | ||
195 | dev_set_drvdata(dev, NULL); | |
196 | ||
197 | iounmap((void *) (&bus->priv)); | |
198 | bus->priv = NULL; | |
199 | kfree(bus); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static struct device_driver gianfar_mdio_driver = { | |
205 | .name = "fsl-gianfar_mdio", | |
206 | .bus = &platform_bus_type, | |
207 | .probe = gfar_mdio_probe, | |
208 | .remove = gfar_mdio_remove, | |
209 | }; | |
210 | ||
211 | int __init gfar_mdio_init(void) | |
212 | { | |
213 | return driver_register(&gianfar_mdio_driver); | |
214 | } | |
215 | ||
216 | void __exit gfar_mdio_exit(void) | |
217 | { | |
218 | driver_unregister(&gianfar_mdio_driver); | |
219 | } |