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
fs_enet_fec_mii_read(struct mii_bus * bus,int phy_id,int location)52 static 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
fs_enet_fec_mii_write(struct mii_bus * bus,int phy_id,int location,u16 val)75 static 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
98 static const struct of_device_id fs_enet_mdio_fec_match[];
fs_enet_mdio_probe(struct platform_device * ofdev)99 static 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
179 out_unmap_regs:
180 iounmap(fec->fecp);
181 out_res:
182 out_fec:
183 kfree(fec);
184 out_mii:
185 mdiobus_free(new_bus);
186 out:
187 return ret;
188 }
189
fs_enet_mdio_remove(struct platform_device * ofdev)190 static 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
203 static 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 };
215 MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
216
217 static 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
226 module_platform_driver(fs_enet_fec_mdio_driver);
227
