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
35#include <asm/pgtable.h>
36#include <asm/irq.h>
37#include <asm/uaccess.h>
38
39#include "fs_enet.h"
40#include "fec.h"
41
42/* Make MII read/write commands for the FEC.
43*/
44#define mk_mii_read(REG)	(0x60020000 | ((REG & 0x1f) << 18))
45#define mk_mii_write(REG, VAL)	(0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
46#define mk_mii_end		0
47
48#define FEC_MII_LOOPS	10000
49
50static int match_has_phy (struct device *dev, void* data)
51{
52	struct platform_device* pdev = container_of(dev, struct platform_device, dev);
53	struct fs_platform_info* fpi;
54	if(strcmp(pdev->name, (char*)data))
55	{
56	    return 0;
57	}
58
59	fpi = pdev->dev.platform_data;
60	if((fpi)&&(fpi->has_phy))
61		return 1;
62	return 0;
63}
64
65static int fs_mii_fec_init(struct fec_info* fec, struct fs_mii_fec_platform_info *fmpi)
66{
67	struct resource *r;
68	fec_t *fecp;
69	char* name = "fsl-cpm-fec";
70
71	/* we need fec in order to be useful */
72	struct platform_device *fec_pdev =
73		container_of(bus_find_device(&platform_bus_type, NULL, name, match_has_phy),
74				struct platform_device, dev);
75
76	if(fec_pdev == NULL) {
77		printk(KERN_ERR"Unable to find PHY for %s", name);
78		return -ENODEV;
79	}
80
81	r = platform_get_resource_byname(fec_pdev, IORESOURCE_MEM, "regs");
82
83	fec->fecp = fecp = (fec_t*)ioremap(r->start,sizeof(fec_t));
84	fec->mii_speed = fmpi->mii_speed;
85
86	setbits32(&fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);	/* MII enable */
87	setbits32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
88	out_be32(&fecp->fec_ievent, FEC_ENET_MII);
89	out_be32(&fecp->fec_mii_speed, fec->mii_speed);
90
91	return 0;
92}
93
94static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
95{
96	struct fec_info* fec = bus->priv;
97	fec_t *fecp = fec->fecp;
98	int i, ret = -1;
99
100	if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
101		BUG();
102
103	/* Add PHY address to register command.  */
104	out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
105
106	for (i = 0; i < FEC_MII_LOOPS; i++)
107		if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
108			break;
109
110	if (i < FEC_MII_LOOPS) {
111		out_be32(&fecp->fec_ievent, FEC_ENET_MII);
112		ret = in_be32(&fecp->fec_mii_data) & 0xffff;
113	}
114
115	return ret;
116
117}
118
119static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
120{
121	struct fec_info* fec = bus->priv;
122	fec_t *fecp = fec->fecp;
123	int i;
124
125	/* this must never happen */
126	if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
127		BUG();
128
129	/* Add PHY address to register command.  */
130	out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
131
132	for (i = 0; i < FEC_MII_LOOPS; i++)
133		if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
134			break;
135
136	if (i < FEC_MII_LOOPS)
137		out_be32(&fecp->fec_ievent, FEC_ENET_MII);
138
139	return 0;
140
141}
142
143static int fs_enet_fec_mii_reset(struct mii_bus *bus)
144{
145	/* nothing here - for now */
146	return 0;
147}
148
149static int __devinit fs_enet_fec_mdio_probe(struct device *dev)
150{
151	struct platform_device *pdev = to_platform_device(dev);
152	struct fs_mii_fec_platform_info *pdata;
153	struct mii_bus *new_bus;
154	struct fec_info *fec;
155	int err = 0;
156	if (NULL == dev)
157		return -EINVAL;
158	new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
159
160	if (NULL == new_bus)
161		return -ENOMEM;
162
163	fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
164
165	if (NULL == fec)
166		return -ENOMEM;
167
168	new_bus->name = "FEC MII Bus",
169	new_bus->read = &fs_enet_fec_mii_read,
170	new_bus->write = &fs_enet_fec_mii_write,
171	new_bus->reset = &fs_enet_fec_mii_reset,
172	new_bus->id = pdev->id;
173
174	pdata = (struct fs_mii_fec_platform_info *)pdev->dev.platform_data;
175
176	if (NULL == pdata) {
177		printk(KERN_ERR "fs_enet FEC mdio %d: Missing platform data!\n", pdev->id);
178		return -ENODEV;
179	}
180
181	/*set up workspace*/
182
183	fs_mii_fec_init(fec, pdata);
184	new_bus->priv = fec;
185
186	new_bus->irq = pdata->irq;
187
188	new_bus->dev = dev;
189	dev_set_drvdata(dev, new_bus);
190
191	err = mdiobus_register(new_bus);
192
193	if (0 != err) {
194		printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
195				new_bus->name);
196		goto bus_register_fail;
197	}
198
199	return 0;
200
201bus_register_fail:
202	kfree(new_bus);
203
204	return err;
205}
206
207
208static int fs_enet_fec_mdio_remove(struct device *dev)
209{
210	struct mii_bus *bus = dev_get_drvdata(dev);
211
212	mdiobus_unregister(bus);
213
214	dev_set_drvdata(dev, NULL);
215	kfree(bus->priv);
216
217	bus->priv = NULL;
218	kfree(bus);
219
220	return 0;
221}
222
223static struct device_driver fs_enet_fec_mdio_driver = {
224	.name = "fsl-cpm-fec-mdio",
225	.bus = &platform_bus_type,
226	.probe = fs_enet_fec_mdio_probe,
227	.remove = fs_enet_fec_mdio_remove,
228};
229
230int fs_enet_mdio_fec_init(void)
231{
232	return driver_register(&fs_enet_fec_mdio_driver);
233}
234
235void fs_enet_mdio_fec_exit(void)
236{
237	driver_unregister(&fs_enet_fec_mdio_driver);
238}
239