/drivers/net/ethernet/freescale/fs_enet/mii-fec.c

  1/*
  2 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
  3 *
  4 * Copyright (c) 2003 Intracom S.A.
  5 *  by Pantelis Antoniou <panto@intracom.gr>
  6 *
  7 * 2005 (c) MontaVista Software, Inc.
  8 * Vitaly Bordug <vbordug@ru.mvista.com>
  9 *
 10 * This file is licensed under the terms of the GNU General Public License
 11 * version 2. This program is licensed "as is" without any warranty of any
 12 * kind, whether express or implied.
 13 */
 14
 15#include <linux/module.h>
 16#include <linux/types.h>
 17#include <linux/kernel.h>
 18#include <linux/string.h>
 19#include <linux/ptrace.h>
 20#include <linux/errno.h>
 21#include <linux/ioport.h>
 22#include <linux/slab.h>
 23#include <linux/interrupt.h>
 24#include <linux/delay.h>
 25#include <linux/netdevice.h>
 26#include <linux/etherdevice.h>
 27#include <linux/skbuff.h>
 28#include <linux/spinlock.h>
 29#include <linux/mii.h>
 30#include <linux/ethtool.h>
 31#include <linux/bitops.h>
 32#include <linux/platform_device.h>
 33#include <linux/of_address.h>
 34#include <linux/of_platform.h>
 35
 36#include <asm/pgtable.h>
 37#include <asm/irq.h>
 38#include <linux/uaccess.h>
 39#include <asm/mpc5xxx.h>
 40
 41#include "fs_enet.h"
 42#include "fec.h"
 43
 44/* Make MII read/write commands for the FEC.
 45*/
 46#define mk_mii_read(REG)	(0x60020000 | ((REG & 0x1f) << 18))
 47#define mk_mii_write(REG, VAL)	(0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
 48#define mk_mii_end		0
 49
 50#define FEC_MII_LOOPS	10000
 51
 52static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
 53{
 54	struct fec_info* fec = bus->priv;
 55	struct fec __iomem *fecp = fec->fecp;
 56	int i, ret = -1;
 57
 58	BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
 59
 60	/* Add PHY address to register command.  */
 61	out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
 62
 63	for (i = 0; i < FEC_MII_LOOPS; i++)
 64		if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 65			break;
 66
 67	if (i < FEC_MII_LOOPS) {
 68		out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 69		ret = in_be32(&fecp->fec_mii_data) & 0xffff;
 70	}
 71
 72	return ret;
 73}
 74
 75static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
 76{
 77	struct fec_info* fec = bus->priv;
 78	struct fec __iomem *fecp = fec->fecp;
 79	int i;
 80
 81	/* this must never happen */
 82	BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
 83
 84	/* Add PHY address to register command.  */
 85	out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
 86
 87	for (i = 0; i < FEC_MII_LOOPS; i++)
 88		if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 89			break;
 90
 91	if (i < FEC_MII_LOOPS)
 92		out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 93
 94	return 0;
 95
 96}
 97
 98static const struct of_device_id fs_enet_mdio_fec_match[];
 99static int fs_enet_mdio_probe(struct platform_device *ofdev)
100{
101	const struct of_device_id *match;
102	struct resource res;
103	struct mii_bus *new_bus;
104	struct fec_info *fec;
105	int (*get_bus_freq)(struct device_node *);
106	int ret = -ENOMEM, clock, speed;
107
108	match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
109	if (!match)
110		return -EINVAL;
111	get_bus_freq = match->data;
112
113	new_bus = mdiobus_alloc();
114	if (!new_bus)
115		goto out;
116
117	fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
118	if (!fec)
119		goto out_mii;
120
121	new_bus->priv = fec;
122	new_bus->name = "FEC MII Bus";
123	new_bus->read = &fs_enet_fec_mii_read;
124	new_bus->write = &fs_enet_fec_mii_write;
125
126	ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
127	if (ret)
128		goto out_res;
129
130	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
131
132	fec->fecp = ioremap(res.start, resource_size(&res));
133	if (!fec->fecp) {
134		ret = -ENOMEM;
135		goto out_fec;
136	}
137
138	if (get_bus_freq) {
139		clock = get_bus_freq(ofdev->dev.of_node);
140		if (!clock) {
141			/* Use maximum divider if clock is unknown */
142			dev_warn(&ofdev->dev, "could not determine IPS clock\n");
143			clock = 0x3F * 5000000;
144		}
145	} else
146		clock = ppc_proc_freq;
147
148	/*
149	 * Scale for a MII clock <= 2.5 MHz
150	 * Note that only 6 bits (25:30) are available for MII speed.
151	 */
152	speed = (clock + 4999999) / 5000000;
153	if (speed > 0x3F) {
154		speed = 0x3F;
155		dev_err(&ofdev->dev,
156			"MII clock (%d Hz) exceeds max (2.5 MHz)\n",
157			clock / speed);
158	}
159
160	fec->mii_speed = speed << 1;
161
162	setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
163	setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
164	                                  FEC_ECNTRL_ETHER_EN);
165	out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
166	clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);
167
168	new_bus->phy_mask = ~0;
169
170	new_bus->parent = &ofdev->dev;
171	platform_set_drvdata(ofdev, new_bus);
172
173	ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
174	if (ret)
175		goto out_unmap_regs;
176
177	return 0;
178
179out_unmap_regs:
180	iounmap(fec->fecp);
181out_res:
182out_fec:
183	kfree(fec);
184out_mii:
185	mdiobus_free(new_bus);
186out:
187	return ret;
188}
189
190static int fs_enet_mdio_remove(struct platform_device *ofdev)
191{
192	struct mii_bus *bus = platform_get_drvdata(ofdev);
193	struct fec_info *fec = bus->priv;
194
195	mdiobus_unregister(bus);
196	iounmap(fec->fecp);
197	kfree(fec);
198	mdiobus_free(bus);
199
200	return 0;
201}
202
203static const struct of_device_id fs_enet_mdio_fec_match[] = {
204	{
205		.compatible = "fsl,pq1-fec-mdio",
206	},
207#if defined(CONFIG_PPC_MPC512x)
208	{
209		.compatible = "fsl,mpc5121-fec-mdio",
210		.data = mpc5xxx_get_bus_frequency,
211	},
212#endif
213	{},
214};
215MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
216
217static struct platform_driver fs_enet_fec_mdio_driver = {
218	.driver = {
219		.name = "fsl-fec-mdio",
220		.of_match_table = fs_enet_mdio_fec_match,
221	},
222	.probe = fs_enet_mdio_probe,
223	.remove = fs_enet_mdio_remove,
224};
225
226module_platform_driver(fs_enet_fec_mdio_driver);