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Jeff Garzik6aa20a22006-09-13 13:24:59 -04001/*
Andy Flemingbb40dcb2005-09-23 22:54:21 -04002 * 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
Kumar Gala4c8d3d92005-11-13 16:06:30 -08008 * Maintainer: Kumar Gala
Andy Flemingbb40dcb2005-09-23 22:54:21 -04009 *
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
Andy Flemingbb40dcb2005-09-23 22:54:21 -040019#include <linux/kernel.h>
Andy Flemingbb40dcb2005-09-23 22:54:21 -040020#include <linux/string.h>
21#include <linux/errno.h>
22#include <linux/unistd.h>
23#include <linux/slab.h>
24#include <linux/interrupt.h>
25#include <linux/init.h>
26#include <linux/delay.h>
27#include <linux/netdevice.h>
28#include <linux/etherdevice.h>
29#include <linux/skbuff.h>
30#include <linux/spinlock.h>
31#include <linux/mm.h>
32#include <linux/module.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010033#include <linux/platform_device.h>
Andy Flemingbb40dcb2005-09-23 22:54:21 -040034#include <linux/crc32.h>
35#include <linux/mii.h>
36#include <linux/phy.h>
37
38#include <asm/io.h>
39#include <asm/irq.h>
40#include <asm/uaccess.h>
41
42#include "gianfar.h"
43#include "gianfar_mii.h"
44
Kapil Junejad3c12872007-05-11 18:25:11 -050045/*
46 * Write value to the PHY at mii_id at register regnum,
47 * on the bus attached to the local interface, which may be different from the
48 * generic mdio bus (tied to a single interface), waiting until the write is
49 * done before returning. This is helpful in programming interfaces like
50 * the TBI which control interfaces like onchip SERDES and are always tied to
51 * the local mdio pins, which may not be the same as system mdio bus, used for
52 * controlling the external PHYs, for example.
53 */
Al Virofdb26622008-02-13 03:58:36 +000054int gfar_local_mdio_write(struct gfar_mii __iomem *regs, int mii_id,
Kapil Junejad3c12872007-05-11 18:25:11 -050055 int regnum, u16 value)
Andy Flemingbb40dcb2005-09-23 22:54:21 -040056{
Andy Flemingbb40dcb2005-09-23 22:54:21 -040057 /* Set the PHY address and the register address we want to write */
58 gfar_write(&regs->miimadd, (mii_id << 8) | regnum);
59
60 /* Write out the value we want */
61 gfar_write(&regs->miimcon, value);
62
63 /* Wait for the transaction to finish */
64 while (gfar_read(&regs->miimind) & MIIMIND_BUSY)
65 cpu_relax();
66
67 return 0;
68}
69
Kapil Junejad3c12872007-05-11 18:25:11 -050070/*
71 * Read the bus for PHY at addr mii_id, register regnum, and
72 * return the value. Clears miimcom first. All PHY operation
73 * done on the bus attached to the local interface,
74 * which may be different from the generic mdio bus
75 * This is helpful in programming interfaces like
76 * the TBI which, inturn, control interfaces like onchip SERDES
77 * and are always tied to the local mdio pins, which may not be the
78 * same as system mdio bus, used for controlling the external PHYs, for eg.
79 */
Al Virofdb26622008-02-13 03:58:36 +000080int gfar_local_mdio_read(struct gfar_mii __iomem *regs, int mii_id, int regnum)
Andy Flemingbb40dcb2005-09-23 22:54:21 -040081{
Andy Flemingbb40dcb2005-09-23 22:54:21 -040082 u16 value;
83
84 /* Set the PHY address and the register address we want to read */
85 gfar_write(&regs->miimadd, (mii_id << 8) | regnum);
86
87 /* Clear miimcom, and then initiate a read */
88 gfar_write(&regs->miimcom, 0);
89 gfar_write(&regs->miimcom, MII_READ_COMMAND);
90
91 /* Wait for the transaction to finish */
92 while (gfar_read(&regs->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
93 cpu_relax();
94
95 /* Grab the value of the register from miimstat */
96 value = gfar_read(&regs->miimstat);
97
98 return value;
99}
100
Kapil Junejad3c12872007-05-11 18:25:11 -0500101/* Write value to the PHY at mii_id at register regnum,
102 * on the bus, waiting until the write is done before returning.
103 * All PHY configuration is done through the TSEC1 MIIM regs */
104int gfar_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
105{
106 struct gfar_mii __iomem *regs = (void __iomem *)bus->priv;
107
108 /* Write to the local MII regs */
109 return(gfar_local_mdio_write(regs, mii_id, regnum, value));
110}
111
112/* Read the bus for PHY at addr mii_id, register regnum, and
113 * return the value. Clears miimcom first. All PHY
114 * configuration has to be done through the TSEC1 MIIM regs */
115int gfar_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
116{
117 struct gfar_mii __iomem *regs = (void __iomem *)bus->priv;
118
119 /* Read the local MII regs */
120 return(gfar_local_mdio_read(regs, mii_id, regnum));
121}
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400122
123/* Reset the MIIM registers, and wait for the bus to free */
Paul Gortmakerd0313582008-04-17 00:08:10 -0400124static int gfar_mdio_reset(struct mii_bus *bus)
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400125{
Kumar Galacc8c6e32006-02-01 15:18:03 -0600126 struct gfar_mii __iomem *regs = (void __iomem *)bus->priv;
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400127 unsigned int timeout = PHY_INIT_TIMEOUT;
128
Andy Fleming15cf6dd2008-02-05 16:35:30 -0600129 mutex_lock(&bus->mdio_lock);
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400130
131 /* Reset the management interface */
132 gfar_write(&regs->miimcfg, MIIMCFG_RESET);
133
134 /* Setup the MII Mgmt clock speed */
135 gfar_write(&regs->miimcfg, MIIMCFG_INIT_VALUE);
136
137 /* Wait until the bus is free */
138 while ((gfar_read(&regs->miimind) & MIIMIND_BUSY) &&
139 timeout--)
140 cpu_relax();
141
Andy Fleming15cf6dd2008-02-05 16:35:30 -0600142 mutex_unlock(&bus->mdio_lock);
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400143
144 if(timeout <= 0) {
145 printk(KERN_ERR "%s: The MII Bus is stuck!\n",
146 bus->name);
147 return -EBUSY;
148 }
149
150 return 0;
151}
152
153
Paul Gortmakerd0313582008-04-17 00:08:10 -0400154static int gfar_mdio_probe(struct device *dev)
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400155{
156 struct platform_device *pdev = to_platform_device(dev);
157 struct gianfar_mdio_data *pdata;
Kumar Galacc8c6e32006-02-01 15:18:03 -0600158 struct gfar_mii __iomem *regs;
Paul Gortmakerd0313582008-04-17 00:08:10 -0400159 struct gfar __iomem *enet_regs;
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400160 struct mii_bus *new_bus;
Kumar Gala1d532672006-01-11 11:27:32 -0800161 struct resource *r;
Paul Gortmakerd0313582008-04-17 00:08:10 -0400162 int i, err = 0;
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400163
164 if (NULL == dev)
165 return -EINVAL;
166
Kumar Gala125d1282005-11-09 12:13:11 -0600167 new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400168
169 if (NULL == new_bus)
170 return -ENOMEM;
171
172 new_bus->name = "Gianfar MII Bus",
173 new_bus->read = &gfar_mdio_read,
174 new_bus->write = &gfar_mdio_write,
175 new_bus->reset = &gfar_mdio_reset,
Andy Fleming9d9326d2008-04-09 19:38:13 -0500176 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id);
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400177
178 pdata = (struct gianfar_mdio_data *)pdev->dev.platform_data;
179
180 if (NULL == pdata) {
181 printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id);
182 return -ENODEV;
183 }
184
Kumar Gala1d532672006-01-11 11:27:32 -0800185 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
186
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400187 /* Set the PHY base address */
Kumar Galacc8c6e32006-02-01 15:18:03 -0600188 regs = ioremap(r->start, sizeof (struct gfar_mii));
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400189
190 if (NULL == regs) {
191 err = -ENOMEM;
192 goto reg_map_fail;
193 }
194
Kumar Galacc8c6e32006-02-01 15:18:03 -0600195 new_bus->priv = (void __force *)regs;
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400196
197 new_bus->irq = pdata->irq;
198
199 new_bus->dev = dev;
200 dev_set_drvdata(dev, new_bus);
201
Paul Gortmakerd0313582008-04-17 00:08:10 -0400202 /*
203 * This is mildly evil, but so is our hardware for doing this.
204 * Also, we have to cast back to struct gfar_mii because of
205 * definition weirdness done in gianfar.h.
206 */
207 enet_regs = (struct gfar __iomem *)
208 ((char *)regs - offsetof(struct gfar, gfar_mii_regs));
209
210 /* Scan the bus, looking for an empty spot for TBIPA */
211 gfar_write(&enet_regs->tbipa, 0);
212 for (i = PHY_MAX_ADDR; i > 0; i--) {
213 u32 phy_id;
214 int r;
215
216 r = get_phy_id(new_bus, i, &phy_id);
217 if (r)
218 return r;
219
220 if (phy_id == 0xffffffff)
221 break;
222 }
223
224 /* The bus is full. We don't support using 31 PHYs, sorry */
225 if (i == 0)
226 return -EBUSY;
227
228 gfar_write(&enet_regs->tbipa, i);
229
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400230 err = mdiobus_register(new_bus);
231
232 if (0 != err) {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400233 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400234 new_bus->name);
235 goto bus_register_fail;
236 }
237
238 return 0;
239
240bus_register_fail:
Kumar Galacc8c6e32006-02-01 15:18:03 -0600241 iounmap(regs);
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400242reg_map_fail:
243 kfree(new_bus);
244
245 return err;
246}
247
248
Paul Gortmakerd0313582008-04-17 00:08:10 -0400249static int gfar_mdio_remove(struct device *dev)
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400250{
251 struct mii_bus *bus = dev_get_drvdata(dev);
252
253 mdiobus_unregister(bus);
254
255 dev_set_drvdata(dev, NULL);
256
Kumar Galacc8c6e32006-02-01 15:18:03 -0600257 iounmap((void __iomem *)bus->priv);
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400258 bus->priv = NULL;
259 kfree(bus);
260
261 return 0;
262}
263
264static struct device_driver gianfar_mdio_driver = {
265 .name = "fsl-gianfar_mdio",
266 .bus = &platform_bus_type,
267 .probe = gfar_mdio_probe,
268 .remove = gfar_mdio_remove,
269};
270
271int __init gfar_mdio_init(void)
272{
273 return driver_register(&gianfar_mdio_driver);
274}
275
Kumar Galab9daf6c2007-07-26 00:52:34 -0500276void gfar_mdio_exit(void)
Andy Flemingbb40dcb2005-09-23 22:54:21 -0400277{
278 driver_unregister(&gianfar_mdio_driver);
279}