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/init.h>
25 #include <linux/delay.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/skbuff.h>
29 #include <linux/spinlock.h>
30 #include <linux/mii.h>
31 #include <linux/ethtool.h>
32 #include <linux/bitops.h>
33 #include <linux/platform_device.h>
34 #include <linux/of_platform.h>
35
36 #include <asm/pgtable.h>
37 #include <asm/irq.h>
38 #include <asm/uaccess.h>
39
40 #include "fs_enet.h"
41 #include "fec.h"
42
43 /* Make MII read/write commands for the FEC.
44 */
45 #define mk_mii_read(REG) (0x60020000 | ((REG & 0x1f) << 18))
46 #define mk_mii_write(REG, VAL) (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
47 #define mk_mii_end 0
48
49 #define FEC_MII_LOOPS 10000
50
fs_enet_fec_mii_read(struct mii_bus * bus,int phy_id,int location)51 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
52 {
53 struct fec_info* fec = bus->priv;
54 fec_t __iomem *fecp = fec->fecp;
55 int i, ret = -1;
56
57 if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
58 BUG();
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 fec_t __iomem *fecp = fec->fecp;
79 int i;
80
81 /* this must never happen */
82 if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
83 BUG();
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
fs_enet_fec_mii_reset(struct mii_bus * bus)99 static int fs_enet_fec_mii_reset(struct mii_bus *bus)
100 {
101 /* nothing here - for now */
102 return 0;
103 }
104
add_phy(struct mii_bus * bus,struct device_node * np)105 static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
106 {
107 const u32 *data;
108 int len, id, irq;
109
110 data = of_get_property(np, "reg", &len);
111 if (!data || len != 4)
112 return;
113
114 id = *data;
115 bus->phy_mask &= ~(1 << id);
116
117 irq = of_irq_to_resource(np, 0, NULL);
118 if (irq != NO_IRQ)
119 bus->irq[id] = irq;
120 }
121
fs_enet_mdio_probe(struct of_device * ofdev,const struct of_device_id * match)122 static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
123 const struct of_device_id *match)
124 {
125 struct device_node *np = NULL;
126 struct resource res;
127 struct mii_bus *new_bus;
128 struct fec_info *fec;
129 int ret = -ENOMEM, i;
130
131 new_bus = mdiobus_alloc();
132 if (!new_bus)
133 goto out;
134
135 fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
136 if (!fec)
137 goto out_mii;
138
139 new_bus->priv = fec;
140 new_bus->name = "FEC MII Bus";
141 new_bus->read = &fs_enet_fec_mii_read;
142 new_bus->write = &fs_enet_fec_mii_write;
143 new_bus->reset = &fs_enet_fec_mii_reset;
144
145 ret = of_address_to_resource(ofdev->node, 0, &res);
146 if (ret)
147 goto out_res;
148
149 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
150
151 fec->fecp = ioremap(res.start, res.end - res.start + 1);
152 if (!fec->fecp)
153 goto out_fec;
154
155 fec->mii_speed = ((ppc_proc_freq + 4999999) / 5000000) << 1;
156
157 setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
158 setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
159 FEC_ECNTRL_ETHER_EN);
160 out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
161 out_be32(&fec->fecp->fec_mii_speed, fec->mii_speed);
162
163 new_bus->phy_mask = ~0;
164 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
165 if (!new_bus->irq)
166 goto out_unmap_regs;
167
168 for (i = 0; i < PHY_MAX_ADDR; i++)
169 new_bus->irq[i] = -1;
170
171 while ((np = of_get_next_child(ofdev->node, np)))
172 if (!strcmp(np->type, "ethernet-phy"))
173 add_phy(new_bus, np);
174
175 new_bus->parent = &ofdev->dev;
176 dev_set_drvdata(&ofdev->dev, new_bus);
177
178 ret = mdiobus_register(new_bus);
179 if (ret)
180 goto out_free_irqs;
181
182 return 0;
183
184 out_free_irqs:
185 dev_set_drvdata(&ofdev->dev, NULL);
186 kfree(new_bus->irq);
187 out_unmap_regs:
188 iounmap(fec->fecp);
189 out_res:
190 out_fec:
191 kfree(fec);
192 out_mii:
193 mdiobus_free(new_bus);
194 out:
195 return ret;
196 }
197
fs_enet_mdio_remove(struct of_device * ofdev)198 static int fs_enet_mdio_remove(struct of_device *ofdev)
199 {
200 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
201 struct fec_info *fec = bus->priv;
202
203 mdiobus_unregister(bus);
204 dev_set_drvdata(&ofdev->dev, NULL);
205 kfree(bus->irq);
206 iounmap(fec->fecp);
207 kfree(fec);
208 mdiobus_free(bus);
209
210 return 0;
211 }
212
213 static struct of_device_id fs_enet_mdio_fec_match[] = {
214 {
215 .compatible = "fsl,pq1-fec-mdio",
216 },
217 {},
218 };
219
220 static struct of_platform_driver fs_enet_fec_mdio_driver = {
221 .name = "fsl-fec-mdio",
222 .match_table = fs_enet_mdio_fec_match,
223 .probe = fs_enet_mdio_probe,
224 .remove = fs_enet_mdio_remove,
225 };
226
fs_enet_mdio_fec_init(void)227 static int fs_enet_mdio_fec_init(void)
228 {
229 return of_register_platform_driver(&fs_enet_fec_mdio_driver);
230 }
231
fs_enet_mdio_fec_exit(void)232 static void fs_enet_mdio_fec_exit(void)
233 {
234 of_unregister_platform_driver(&fs_enet_fec_mdio_driver);
235 }
236
237 module_init(fs_enet_mdio_fec_init);
238 module_exit(fs_enet_mdio_fec_exit);
239