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