blob: e3ba14a19915d0ab5b01837c9429339761c216eb [file] [log] [blame]
Kim Phillips728de4c92007-04-13 01:26:03 -05001/*
2 * drivers/net/ucc_geth_mii.c
3 *
Kim Phillips4e19b5c2007-05-11 18:25:07 -05004 * QE UCC Gigabit Ethernet Driver -- MII Management Bus Implementation
5 * Provides Bus interface for MII Management regs in the UCC register space
Kim Phillips728de4c92007-04-13 01:26:03 -05006 *
Kim Phillips4e19b5c2007-05-11 18:25:07 -05007 * Copyright (C) 2007 Freescale Semiconductor, Inc.
Kim Phillips728de4c92007-04-13 01:26:03 -05008 *
Kim Phillips4e19b5c2007-05-11 18:25:07 -05009 * Authors: Li Yang <leoli@freescale.com>
10 * Kim Phillips <kim.phillips@freescale.com>
Kim Phillips728de4c92007-04-13 01:26:03 -050011 *
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/kernel.h>
20#include <linux/sched.h>
21#include <linux/string.h>
22#include <linux/errno.h>
23#include <linux/unistd.h>
24#include <linux/slab.h>
25#include <linux/interrupt.h>
26#include <linux/init.h>
27#include <linux/delay.h>
28#include <linux/netdevice.h>
29#include <linux/etherdevice.h>
30#include <linux/skbuff.h>
31#include <linux/spinlock.h>
32#include <linux/mm.h>
33#include <linux/module.h>
34#include <linux/platform_device.h>
Kim Phillips728de4c92007-04-13 01:26:03 -050035#include <linux/crc32.h>
36#include <linux/mii.h>
37#include <linux/phy.h>
38#include <linux/fsl_devices.h>
39
40#include <asm/of_platform.h>
41#include <asm/io.h>
42#include <asm/irq.h>
43#include <asm/uaccess.h>
44#include <asm/ucc.h>
45
46#include "ucc_geth_mii.h"
47#include "ucc_geth.h"
48
49#define DEBUG
50#ifdef DEBUG
51#define vdbg(format, arg...) printk(KERN_DEBUG , format "\n" , ## arg)
52#else
53#define vdbg(format, arg...) do {} while(0)
54#endif
55
Li Yangac421852007-07-19 11:47:47 +080056#define MII_DRV_DESC "QE UCC Ethernet Controller MII Bus"
57#define MII_DRV_NAME "fsl-uec_mdio"
Kim Phillips728de4c92007-04-13 01:26:03 -050058
59/* Write value to the PHY for this device to the register at regnum, */
60/* waiting until the write is done before it returns. All PHY */
61/* configuration has to be done through the master UEC MIIM regs */
62int uec_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
63{
64 struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv;
65
66 /* Setting up the MII Mangement Address Register */
67 out_be32(&regs->miimadd,
68 (mii_id << MIIMADD_PHY_ADDRESS_SHIFT) | regnum);
69
70 /* Setting up the MII Mangement Control Register with the value */
71 out_be32(&regs->miimcon, value);
72
73 /* Wait till MII management write is complete */
74 while ((in_be32(&regs->miimind)) & MIIMIND_BUSY)
75 cpu_relax();
76
77 return 0;
78}
79
80/* Reads from register regnum in the PHY for device dev, */
81/* returning the value. Clears miimcom first. All PHY */
82/* configuration has to be done through the TSEC1 MIIM regs */
83int uec_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
84{
85 struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv;
86 u16 value;
87
88 /* Setting up the MII Mangement Address Register */
89 out_be32(&regs->miimadd,
90 (mii_id << MIIMADD_PHY_ADDRESS_SHIFT) | regnum);
91
92 /* Clear miimcom, perform an MII management read cycle */
93 out_be32(&regs->miimcom, 0);
94 out_be32(&regs->miimcom, MIIMCOM_READ_CYCLE);
95
96 /* Wait till MII management write is complete */
97 while ((in_be32(&regs->miimind)) & (MIIMIND_BUSY | MIIMIND_NOT_VALID))
98 cpu_relax();
99
100 /* Read MII management status */
101 value = in_be32(&regs->miimstat);
102
103 return value;
104}
105
106/* Reset the MIIM registers, and wait for the bus to free */
107int uec_mdio_reset(struct mii_bus *bus)
108{
109 struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv;
110 unsigned int timeout = PHY_INIT_TIMEOUT;
111
112 spin_lock_bh(&bus->mdio_lock);
113
114 /* Reset the management interface */
115 out_be32(&regs->miimcfg, MIIMCFG_RESET_MANAGEMENT);
116
117 /* Setup the MII Mgmt clock speed */
118 out_be32(&regs->miimcfg, MIIMCFG_MANAGEMENT_CLOCK_DIVIDE_BY_112);
119
120 /* Wait until the bus is free */
121 while ((in_be32(&regs->miimind) & MIIMIND_BUSY) && timeout--)
122 cpu_relax();
123
124 spin_unlock_bh(&bus->mdio_lock);
125
126 if (timeout <= 0) {
127 printk(KERN_ERR "%s: The MII Bus is stuck!\n", bus->name);
128 return -EBUSY;
129 }
130
131 return 0;
132}
133
134static int uec_mdio_probe(struct of_device *ofdev, const struct of_device_id *match)
135{
136 struct device *device = &ofdev->dev;
137 struct device_node *np = ofdev->node, *tempnp = NULL;
138 struct device_node *child = NULL;
139 struct ucc_mii_mng __iomem *regs;
140 struct mii_bus *new_bus;
141 struct resource res;
142 int k, err = 0;
143
144 new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
145
146 if (NULL == new_bus)
147 return -ENOMEM;
148
149 new_bus->name = "UCC Ethernet Controller MII Bus";
150 new_bus->read = &uec_mdio_read;
151 new_bus->write = &uec_mdio_write;
152 new_bus->reset = &uec_mdio_reset;
153
154 memset(&res, 0, sizeof(res));
155
156 err = of_address_to_resource(np, 0, &res);
157 if (err)
158 goto reg_map_fail;
159
160 new_bus->id = res.start;
161
162 new_bus->irq = kmalloc(32 * sizeof(int), GFP_KERNEL);
163
164 if (NULL == new_bus->irq) {
165 err = -ENOMEM;
166 goto reg_map_fail;
167 }
168
169 for (k = 0; k < 32; k++)
170 new_bus->irq[k] = PHY_POLL;
171
172 while ((child = of_get_next_child(np, child)) != NULL) {
173 int irq = irq_of_parse_and_map(child, 0);
174 if (irq != NO_IRQ) {
Stephen Rothwell40cd3a42007-05-01 13:54:02 +1000175 const u32 *id = of_get_property(child, "reg", NULL);
Kim Phillips728de4c92007-04-13 01:26:03 -0500176 new_bus->irq[*id] = irq;
177 }
178 }
179
180 /* Set the base address */
181 regs = ioremap(res.start, sizeof(struct ucc_mii_mng));
182
183 if (NULL == regs) {
184 err = -ENOMEM;
185 goto ioremap_fail;
186 }
187
188 new_bus->priv = (void __force *)regs;
189
190 new_bus->dev = device;
191 dev_set_drvdata(device, new_bus);
192
193 /* Read MII management master from device tree */
194 while ((tempnp = of_find_compatible_node(tempnp, "network", "ucc_geth"))
195 != NULL) {
196 struct resource tempres;
197
198 err = of_address_to_resource(tempnp, 0, &tempres);
199 if (err)
200 goto bus_register_fail;
201
202 /* if our mdio regs fall within this UCC regs range */
203 if ((res.start >= tempres.start) &&
204 (res.end <= tempres.end)) {
205 /* set this UCC to be the MII master */
Stephen Rothwell40cd3a42007-05-01 13:54:02 +1000206 const u32 *id = of_get_property(tempnp, "device-id", NULL);
Kim Phillips728de4c92007-04-13 01:26:03 -0500207 if (id == NULL)
208 goto bus_register_fail;
209
210 ucc_set_qe_mux_mii_mng(*id - 1);
211
212 /* assign the TBI an address which won't
213 * conflict with the PHYs */
214 out_be32(&regs->utbipar, UTBIPAR_INIT_TBIPA);
215 break;
216 }
217 }
218
219 err = mdiobus_register(new_bus);
220 if (0 != err) {
221 printk(KERN_ERR "%s: Cannot register as MDIO bus\n",
222 new_bus->name);
223 goto bus_register_fail;
224 }
225
226 return 0;
227
228bus_register_fail:
229 iounmap(regs);
230ioremap_fail:
231 kfree(new_bus->irq);
232reg_map_fail:
233 kfree(new_bus);
234
235 return err;
236}
237
238int uec_mdio_remove(struct of_device *ofdev)
239{
240 struct device *device = &ofdev->dev;
241 struct mii_bus *bus = dev_get_drvdata(device);
242
243 mdiobus_unregister(bus);
244
245 dev_set_drvdata(device, NULL);
246
247 iounmap((void __iomem *)bus->priv);
248 bus->priv = NULL;
249 kfree(bus);
250
251 return 0;
252}
253
254static struct of_device_id uec_mdio_match[] = {
255 {
256 .type = "mdio",
257 .compatible = "ucc_geth_phy",
258 },
Anton Vorontsovd0a2f822008-01-24 18:40:01 +0300259 {
260 .compatible = "fsl,ucc-mdio",
261 },
Kim Phillips728de4c92007-04-13 01:26:03 -0500262 {},
263};
264
Kim Phillips728de4c92007-04-13 01:26:03 -0500265static struct of_platform_driver uec_mdio_driver = {
Li Yangac421852007-07-19 11:47:47 +0800266 .name = MII_DRV_NAME,
Kim Phillips728de4c92007-04-13 01:26:03 -0500267 .probe = uec_mdio_probe,
268 .remove = uec_mdio_remove,
269 .match_table = uec_mdio_match,
270};
271
272int __init uec_mdio_init(void)
273{
274 return of_register_platform_driver(&uec_mdio_driver);
275}
276
Domen Puncered7e63a2007-08-03 16:07:58 +0800277/* called from __init ucc_geth_init, therefore can not be __exit */
278void uec_mdio_exit(void)
Kim Phillips728de4c92007-04-13 01:26:03 -0500279{
280 of_unregister_platform_driver(&uec_mdio_driver);
281}