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_mdio.h>
35 #include <linux/of_platform.h>
36 #include <linux/pgtable.h>
37
38 #include <asm/irq.h>
39 #include <linux/uaccess.h>
40 #include <asm/mpc5xxx.h>
41
42 #include "fs_enet.h"
43 #include "fec.h"
44
45 /* Make MII read/write commands for the FEC.
46 */
47 #define mk_mii_read(REG) (0x60020000 | ((REG & 0x1f) << 18))
48 #define mk_mii_write(REG, VAL) (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
49 #define mk_mii_end 0
50
51 #define FEC_MII_LOOPS 10000
52
fs_enet_fec_mii_read(struct mii_bus * bus,int phy_id,int location)53 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
54 {
55 struct fec_info* fec = bus->priv;
56 struct fec __iomem *fecp = fec->fecp;
57 int i, ret = -1;
58
59 BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
60
61 /* Add PHY address to register command. */
62 out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
63
64 for (i = 0; i < FEC_MII_LOOPS; i++)
65 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
66 break;
67
68 if (i < FEC_MII_LOOPS) {
69 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
70 ret = in_be32(&fecp->fec_mii_data) & 0xffff;
71 }
72
73 return ret;
74 }
75
fs_enet_fec_mii_write(struct mii_bus * bus,int phy_id,int location,u16 val)76 static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
77 {
78 struct fec_info* fec = bus->priv;
79 struct fec __iomem *fecp = fec->fecp;
80 int i;
81
82 /* this must never happen */
83 BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
84
85 /* Add PHY address to register command. */
86 out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
87
88 for (i = 0; i < FEC_MII_LOOPS; i++)
89 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
90 break;
91
92 if (i < FEC_MII_LOOPS)
93 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
94
95 return 0;
96
97 }
98
99 static const struct of_device_id fs_enet_mdio_fec_match[];
fs_enet_mdio_probe(struct platform_device * ofdev)100 static int fs_enet_mdio_probe(struct platform_device *ofdev)
101 {
102 const struct of_device_id *match;
103 struct resource res;
104 struct mii_bus *new_bus;
105 struct fec_info *fec;
106 int (*get_bus_freq)(struct device *);
107 int ret = -ENOMEM, clock, speed;
108
109 match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
110 if (!match)
111 return -EINVAL;
112 get_bus_freq = match->data;
113
114 new_bus = mdiobus_alloc();
115 if (!new_bus)
116 goto out;
117
118 fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
119 if (!fec)
120 goto out_mii;
121
122 new_bus->priv = fec;
123 new_bus->name = "FEC MII Bus";
124 new_bus->read = &fs_enet_fec_mii_read;
125 new_bus->write = &fs_enet_fec_mii_write;
126
127 ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
128 if (ret)
129 goto out_res;
130
131 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%pap", &res.start);
132
133 fec->fecp = ioremap(res.start, resource_size(&res));
134 if (!fec->fecp) {
135 ret = -ENOMEM;
136 goto out_fec;
137 }
138
139 if (get_bus_freq) {
140 clock = get_bus_freq(&ofdev->dev);
141 if (!clock) {
142 /* Use maximum divider if clock is unknown */
143 dev_warn(&ofdev->dev, "could not determine IPS clock\n");
144 clock = 0x3F * 5000000;
145 }
146 } else
147 clock = ppc_proc_freq;
148
149 /*
150 * Scale for a MII clock <= 2.5 MHz
151 * Note that only 6 bits (25:30) are available for MII speed.
152 */
153 speed = (clock + 4999999) / 5000000;
154 if (speed > 0x3F) {
155 speed = 0x3F;
156 dev_err(&ofdev->dev,
157 "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
158 clock / speed);
159 }
160
161 fec->mii_speed = speed << 1;
162
163 setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
164 setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
165 FEC_ECNTRL_ETHER_EN);
166 out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
167 clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);
168
169 new_bus->phy_mask = ~0;
170
171 new_bus->parent = &ofdev->dev;
172 platform_set_drvdata(ofdev, new_bus);
173
174 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
175 if (ret)
176 goto out_unmap_regs;
177
178 return 0;
179
180 out_unmap_regs:
181 iounmap(fec->fecp);
182 out_res:
183 out_fec:
184 kfree(fec);
185 out_mii:
186 mdiobus_free(new_bus);
187 out:
188 return ret;
189 }
190
fs_enet_mdio_remove(struct platform_device * ofdev)191 static void fs_enet_mdio_remove(struct platform_device *ofdev)
192 {
193 struct mii_bus *bus = platform_get_drvdata(ofdev);
194 struct fec_info *fec = bus->priv;
195
196 mdiobus_unregister(bus);
197 iounmap(fec->fecp);
198 kfree(fec);
199 mdiobus_free(bus);
200 }
201
202 static const struct of_device_id fs_enet_mdio_fec_match[] = {
203 {
204 .compatible = "fsl,pq1-fec-mdio",
205 },
206 #if defined(CONFIG_PPC_MPC512x)
207 {
208 .compatible = "fsl,mpc5121-fec-mdio",
209 .data = mpc5xxx_get_bus_frequency,
210 },
211 #endif
212 {},
213 };
214 MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
215
216 static struct platform_driver fs_enet_fec_mdio_driver = {
217 .driver = {
218 .name = "fsl-fec-mdio",
219 .of_match_table = fs_enet_mdio_fec_match,
220 },
221 .probe = fs_enet_mdio_probe,
222 .remove_new = fs_enet_mdio_remove,
223 };
224
225 module_platform_driver(fs_enet_fec_mdio_driver);
226 MODULE_LICENSE("GPL");
227