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 
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 
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[];
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 
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