1ec21e2ecSJeff Kirsher /*
2ec21e2ecSJeff Kirsher * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
3ec21e2ecSJeff Kirsher *
4ec21e2ecSJeff Kirsher * Copyright (c) 2003 Intracom S.A.
5ec21e2ecSJeff Kirsher * by Pantelis Antoniou <panto@intracom.gr>
6ec21e2ecSJeff Kirsher *
7ec21e2ecSJeff Kirsher * 2005 (c) MontaVista Software, Inc.
8ec21e2ecSJeff Kirsher * Vitaly Bordug <vbordug@ru.mvista.com>
9ec21e2ecSJeff Kirsher *
10ec21e2ecSJeff Kirsher * This file is licensed under the terms of the GNU General Public License
11ec21e2ecSJeff Kirsher * version 2. This program is licensed "as is" without any warranty of any
12ec21e2ecSJeff Kirsher * kind, whether express or implied.
13ec21e2ecSJeff Kirsher */
14ec21e2ecSJeff Kirsher
15ec21e2ecSJeff Kirsher #include <linux/module.h>
16ec21e2ecSJeff Kirsher #include <linux/types.h>
17ec21e2ecSJeff Kirsher #include <linux/kernel.h>
18ec21e2ecSJeff Kirsher #include <linux/string.h>
19ec21e2ecSJeff Kirsher #include <linux/ptrace.h>
20ec21e2ecSJeff Kirsher #include <linux/errno.h>
21ec21e2ecSJeff Kirsher #include <linux/ioport.h>
22ec21e2ecSJeff Kirsher #include <linux/slab.h>
23ec21e2ecSJeff Kirsher #include <linux/interrupt.h>
24ec21e2ecSJeff Kirsher #include <linux/delay.h>
25ec21e2ecSJeff Kirsher #include <linux/netdevice.h>
26ec21e2ecSJeff Kirsher #include <linux/etherdevice.h>
27ec21e2ecSJeff Kirsher #include <linux/skbuff.h>
28ec21e2ecSJeff Kirsher #include <linux/spinlock.h>
29ec21e2ecSJeff Kirsher #include <linux/mii.h>
30ec21e2ecSJeff Kirsher #include <linux/ethtool.h>
31ec21e2ecSJeff Kirsher #include <linux/bitops.h>
32ec21e2ecSJeff Kirsher #include <linux/platform_device.h>
335af50730SRob Herring #include <linux/of_address.h>
34*7a769183SChristophe Leroy #include <linux/of_mdio.h>
35ec21e2ecSJeff Kirsher #include <linux/of_platform.h>
36ca5999fdSMike Rapoport #include <linux/pgtable.h>
3765fddcfcSMike Rapoport
38ec21e2ecSJeff Kirsher #include <asm/irq.h>
397c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
40ec21e2ecSJeff Kirsher #include <asm/mpc5xxx.h>
41ec21e2ecSJeff Kirsher
42ec21e2ecSJeff Kirsher #include "fs_enet.h"
43ec21e2ecSJeff Kirsher #include "fec.h"
44ec21e2ecSJeff Kirsher
45ec21e2ecSJeff Kirsher /* Make MII read/write commands for the FEC.
46ec21e2ecSJeff Kirsher */
47ec21e2ecSJeff Kirsher #define mk_mii_read(REG) (0x60020000 | ((REG & 0x1f) << 18))
48ec21e2ecSJeff Kirsher #define mk_mii_write(REG, VAL) (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
49ec21e2ecSJeff Kirsher #define mk_mii_end 0
50ec21e2ecSJeff Kirsher
51ec21e2ecSJeff Kirsher #define FEC_MII_LOOPS 10000
52ec21e2ecSJeff Kirsher
fs_enet_fec_mii_read(struct mii_bus * bus,int phy_id,int location)53ec21e2ecSJeff Kirsher static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
54ec21e2ecSJeff Kirsher {
55ec21e2ecSJeff Kirsher struct fec_info* fec = bus->priv;
56ec21e2ecSJeff Kirsher struct fec __iomem *fecp = fec->fecp;
57ec21e2ecSJeff Kirsher int i, ret = -1;
58ec21e2ecSJeff Kirsher
59ec21e2ecSJeff Kirsher BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
60ec21e2ecSJeff Kirsher
61ec21e2ecSJeff Kirsher /* Add PHY address to register command. */
62ec21e2ecSJeff Kirsher out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
63ec21e2ecSJeff Kirsher
64ec21e2ecSJeff Kirsher for (i = 0; i < FEC_MII_LOOPS; i++)
65ec21e2ecSJeff Kirsher if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
66ec21e2ecSJeff Kirsher break;
67ec21e2ecSJeff Kirsher
68ec21e2ecSJeff Kirsher if (i < FEC_MII_LOOPS) {
69ec21e2ecSJeff Kirsher out_be32(&fecp->fec_ievent, FEC_ENET_MII);
70ec21e2ecSJeff Kirsher ret = in_be32(&fecp->fec_mii_data) & 0xffff;
71ec21e2ecSJeff Kirsher }
72ec21e2ecSJeff Kirsher
73ec21e2ecSJeff Kirsher return ret;
74ec21e2ecSJeff Kirsher }
75ec21e2ecSJeff Kirsher
fs_enet_fec_mii_write(struct mii_bus * bus,int phy_id,int location,u16 val)76ec21e2ecSJeff Kirsher static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
77ec21e2ecSJeff Kirsher {
78ec21e2ecSJeff Kirsher struct fec_info* fec = bus->priv;
79ec21e2ecSJeff Kirsher struct fec __iomem *fecp = fec->fecp;
80ec21e2ecSJeff Kirsher int i;
81ec21e2ecSJeff Kirsher
82ec21e2ecSJeff Kirsher /* this must never happen */
83ec21e2ecSJeff Kirsher BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
84ec21e2ecSJeff Kirsher
85ec21e2ecSJeff Kirsher /* Add PHY address to register command. */
86ec21e2ecSJeff Kirsher out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
87ec21e2ecSJeff Kirsher
88ec21e2ecSJeff Kirsher for (i = 0; i < FEC_MII_LOOPS; i++)
89ec21e2ecSJeff Kirsher if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
90ec21e2ecSJeff Kirsher break;
91ec21e2ecSJeff Kirsher
92ec21e2ecSJeff Kirsher if (i < FEC_MII_LOOPS)
93ec21e2ecSJeff Kirsher out_be32(&fecp->fec_ievent, FEC_ENET_MII);
94ec21e2ecSJeff Kirsher
95ec21e2ecSJeff Kirsher return 0;
96ec21e2ecSJeff Kirsher
97ec21e2ecSJeff Kirsher }
98ec21e2ecSJeff Kirsher
9994e5a2a8SFabian Frederick static const struct of_device_id fs_enet_mdio_fec_match[];
fs_enet_mdio_probe(struct platform_device * ofdev)1004f2c53eaSBill Pemberton static int fs_enet_mdio_probe(struct platform_device *ofdev)
101ec21e2ecSJeff Kirsher {
102ec21e2ecSJeff Kirsher const struct of_device_id *match;
103ec21e2ecSJeff Kirsher struct resource res;
104ec21e2ecSJeff Kirsher struct mii_bus *new_bus;
105ec21e2ecSJeff Kirsher struct fec_info *fec;
106de06fba6SAndy Shevchenko int (*get_bus_freq)(struct device *);
107ec21e2ecSJeff Kirsher int ret = -ENOMEM, clock, speed;
108ec21e2ecSJeff Kirsher
109ec21e2ecSJeff Kirsher match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
110ec21e2ecSJeff Kirsher if (!match)
111ec21e2ecSJeff Kirsher return -EINVAL;
112ec21e2ecSJeff Kirsher get_bus_freq = match->data;
113ec21e2ecSJeff Kirsher
114ec21e2ecSJeff Kirsher new_bus = mdiobus_alloc();
115ec21e2ecSJeff Kirsher if (!new_bus)
116ec21e2ecSJeff Kirsher goto out;
117ec21e2ecSJeff Kirsher
118ec21e2ecSJeff Kirsher fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
119ec21e2ecSJeff Kirsher if (!fec)
120ec21e2ecSJeff Kirsher goto out_mii;
121ec21e2ecSJeff Kirsher
122ec21e2ecSJeff Kirsher new_bus->priv = fec;
123ec21e2ecSJeff Kirsher new_bus->name = "FEC MII Bus";
124ec21e2ecSJeff Kirsher new_bus->read = &fs_enet_fec_mii_read;
125ec21e2ecSJeff Kirsher new_bus->write = &fs_enet_fec_mii_write;
126ec21e2ecSJeff Kirsher
127ec21e2ecSJeff Kirsher ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
128ec21e2ecSJeff Kirsher if (ret)
129ec21e2ecSJeff Kirsher goto out_res;
130ec21e2ecSJeff Kirsher
1318f72fb15SJakub Kicinski snprintf(new_bus->id, MII_BUS_ID_SIZE, "%pap", &res.start);
132ec21e2ecSJeff Kirsher
133ec21e2ecSJeff Kirsher fec->fecp = ioremap(res.start, resource_size(&res));
134137bc99fSJulia Lawall if (!fec->fecp) {
135137bc99fSJulia Lawall ret = -ENOMEM;
136ec21e2ecSJeff Kirsher goto out_fec;
137137bc99fSJulia Lawall }
138ec21e2ecSJeff Kirsher
139ec21e2ecSJeff Kirsher if (get_bus_freq) {
140de06fba6SAndy Shevchenko clock = get_bus_freq(&ofdev->dev);
141ec21e2ecSJeff Kirsher if (!clock) {
142ec21e2ecSJeff Kirsher /* Use maximum divider if clock is unknown */
143ec21e2ecSJeff Kirsher dev_warn(&ofdev->dev, "could not determine IPS clock\n");
144ec21e2ecSJeff Kirsher clock = 0x3F * 5000000;
145ec21e2ecSJeff Kirsher }
146ec21e2ecSJeff Kirsher } else
147ec21e2ecSJeff Kirsher clock = ppc_proc_freq;
148ec21e2ecSJeff Kirsher
149ec21e2ecSJeff Kirsher /*
150ec21e2ecSJeff Kirsher * Scale for a MII clock <= 2.5 MHz
151ec21e2ecSJeff Kirsher * Note that only 6 bits (25:30) are available for MII speed.
152ec21e2ecSJeff Kirsher */
153ec21e2ecSJeff Kirsher speed = (clock + 4999999) / 5000000;
154ec21e2ecSJeff Kirsher if (speed > 0x3F) {
155ec21e2ecSJeff Kirsher speed = 0x3F;
156ec21e2ecSJeff Kirsher dev_err(&ofdev->dev,
157ec21e2ecSJeff Kirsher "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
158ec21e2ecSJeff Kirsher clock / speed);
159ec21e2ecSJeff Kirsher }
160ec21e2ecSJeff Kirsher
161ec21e2ecSJeff Kirsher fec->mii_speed = speed << 1;
162ec21e2ecSJeff Kirsher
163ec21e2ecSJeff Kirsher setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
164ec21e2ecSJeff Kirsher setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
165ec21e2ecSJeff Kirsher FEC_ECNTRL_ETHER_EN);
166ec21e2ecSJeff Kirsher out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
167ec21e2ecSJeff Kirsher clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);
168ec21e2ecSJeff Kirsher
169ec21e2ecSJeff Kirsher new_bus->phy_mask = ~0;
170ec21e2ecSJeff Kirsher
171ec21e2ecSJeff Kirsher new_bus->parent = &ofdev->dev;
1728513fbd8SJingoo Han platform_set_drvdata(ofdev, new_bus);
173ec21e2ecSJeff Kirsher
174ec21e2ecSJeff Kirsher ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
175ec21e2ecSJeff Kirsher if (ret)
176e7f4dc35SAndrew Lunn goto out_unmap_regs;
177ec21e2ecSJeff Kirsher
178ec21e2ecSJeff Kirsher return 0;
179ec21e2ecSJeff Kirsher
180ec21e2ecSJeff Kirsher out_unmap_regs:
181ec21e2ecSJeff Kirsher iounmap(fec->fecp);
182ec21e2ecSJeff Kirsher out_res:
183ec21e2ecSJeff Kirsher out_fec:
184ec21e2ecSJeff Kirsher kfree(fec);
185ec21e2ecSJeff Kirsher out_mii:
186ec21e2ecSJeff Kirsher mdiobus_free(new_bus);
187ec21e2ecSJeff Kirsher out:
188ec21e2ecSJeff Kirsher return ret;
189ec21e2ecSJeff Kirsher }
190ec21e2ecSJeff Kirsher
fs_enet_mdio_remove(struct platform_device * ofdev)191ead29c5eSUwe Kleine-König static void fs_enet_mdio_remove(struct platform_device *ofdev)
192ec21e2ecSJeff Kirsher {
1938513fbd8SJingoo Han struct mii_bus *bus = platform_get_drvdata(ofdev);
194ec21e2ecSJeff Kirsher struct fec_info *fec = bus->priv;
195ec21e2ecSJeff Kirsher
196ec21e2ecSJeff Kirsher mdiobus_unregister(bus);
197ec21e2ecSJeff Kirsher iounmap(fec->fecp);
198ec21e2ecSJeff Kirsher kfree(fec);
199ec21e2ecSJeff Kirsher mdiobus_free(bus);
200ec21e2ecSJeff Kirsher }
201ec21e2ecSJeff Kirsher
20294e5a2a8SFabian Frederick static const struct of_device_id fs_enet_mdio_fec_match[] = {
203ec21e2ecSJeff Kirsher {
204ec21e2ecSJeff Kirsher .compatible = "fsl,pq1-fec-mdio",
205ec21e2ecSJeff Kirsher },
206ec21e2ecSJeff Kirsher #if defined(CONFIG_PPC_MPC512x)
207ec21e2ecSJeff Kirsher {
208ec21e2ecSJeff Kirsher .compatible = "fsl,mpc5121-fec-mdio",
209ec21e2ecSJeff Kirsher .data = mpc5xxx_get_bus_frequency,
210ec21e2ecSJeff Kirsher },
211ec21e2ecSJeff Kirsher #endif
212ec21e2ecSJeff Kirsher {},
213ec21e2ecSJeff Kirsher };
214ec21e2ecSJeff Kirsher MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
215ec21e2ecSJeff Kirsher
216ec21e2ecSJeff Kirsher static struct platform_driver fs_enet_fec_mdio_driver = {
217ec21e2ecSJeff Kirsher .driver = {
218ec21e2ecSJeff Kirsher .name = "fsl-fec-mdio",
219ec21e2ecSJeff Kirsher .of_match_table = fs_enet_mdio_fec_match,
220ec21e2ecSJeff Kirsher },
221ec21e2ecSJeff Kirsher .probe = fs_enet_mdio_probe,
222ead29c5eSUwe Kleine-König .remove_new = fs_enet_mdio_remove,
223ec21e2ecSJeff Kirsher };
224ec21e2ecSJeff Kirsher
225db62f684SAxel Lin module_platform_driver(fs_enet_fec_mdio_driver);
226445c6198SMichael Ellerman MODULE_LICENSE("GPL");
227