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Vitaly Bordug5b4b8452006-08-14 23:00:30 -07001/*
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
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070015#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/kernel.h>
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070018#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>
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070024#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>
Kumar Galab2191082008-06-12 08:32:13 -050034#include <linux/of_platform.h>
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070035
36#include <asm/pgtable.h>
37#include <asm/irq.h>
38#include <asm/uaccess.h>
Wolfgang Denk652f6782009-07-17 02:27:07 +000039#include <asm/mpc5xxx.h>
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070040
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
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070052static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
53{
54 struct fec_info* fec = bus->priv;
Anatolij Gustschin60ab4362010-02-26 12:00:48 +000055 struct fec __iomem *fecp = fec->fecp;
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070056 int i, ret = -1;
57
Alexander Beregalov0ee904c2009-04-11 14:50:23 +000058 BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070059
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;
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070073}
74
75static 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;
Anatolij Gustschin60ab4362010-02-26 12:00:48 +000078 struct fec __iomem *fecp = fec->fecp;
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070079 int i;
80
81 /* this must never happen */
Alexander Beregalov0ee904c2009-04-11 14:50:23 +000082 BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070083
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
98static int fs_enet_fec_mii_reset(struct mii_bus *bus)
99{
100 /* nothing here - for now */
101 return 0;
102}
103
Grant Likelyb1608d62011-05-18 11:19:24 -0600104static struct of_device_id fs_enet_mdio_fec_match[];
Grant Likely74888762011-02-22 21:05:51 -0700105static int __devinit fs_enet_mdio_probe(struct platform_device *ofdev)
Scott Wood976de6a2007-10-02 10:55:58 -0500106{
Grant Likelyb1608d62011-05-18 11:19:24 -0600107 const struct of_device_id *match;
Scott Wood976de6a2007-10-02 10:55:58 -0500108 struct resource res;
109 struct mii_bus *new_bus;
110 struct fec_info *fec;
Grant Likely74888762011-02-22 21:05:51 -0700111 int (*get_bus_freq)(struct device_node *);
Wolfgang Denk652f6782009-07-17 02:27:07 +0000112 int ret = -ENOMEM, clock, speed;
Scott Wood976de6a2007-10-02 10:55:58 -0500113
Grant Likelyb1608d62011-05-18 11:19:24 -0600114 match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
115 if (!match)
Grant Likely74888762011-02-22 21:05:51 -0700116 return -EINVAL;
Grant Likelyb1608d62011-05-18 11:19:24 -0600117 get_bus_freq = match->data;
Grant Likely74888762011-02-22 21:05:51 -0700118
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700119 new_bus = mdiobus_alloc();
Scott Wood976de6a2007-10-02 10:55:58 -0500120 if (!new_bus)
121 goto out;
122
123 fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
124 if (!fec)
125 goto out_mii;
126
127 new_bus->priv = fec;
128 new_bus->name = "FEC MII Bus";
129 new_bus->read = &fs_enet_fec_mii_read;
130 new_bus->write = &fs_enet_fec_mii_write;
131 new_bus->reset = &fs_enet_fec_mii_reset;
132
Grant Likely61c7a082010-04-13 16:12:29 -0700133 ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
Scott Wood976de6a2007-10-02 10:55:58 -0500134 if (ret)
Scott Wooda86e2cb2008-05-02 13:42:41 -0500135 goto out_res;
Scott Wood976de6a2007-10-02 10:55:58 -0500136
Andy Fleming9d9326d2008-04-09 19:38:13 -0500137 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
Scott Wood976de6a2007-10-02 10:55:58 -0500138
139 fec->fecp = ioremap(res.start, res.end - res.start + 1);
140 if (!fec->fecp)
141 goto out_fec;
142
Wolfgang Denk652f6782009-07-17 02:27:07 +0000143 if (get_bus_freq) {
Grant Likely61c7a082010-04-13 16:12:29 -0700144 clock = get_bus_freq(ofdev->dev.of_node);
Wolfgang Denk652f6782009-07-17 02:27:07 +0000145 if (!clock) {
146 /* Use maximum divider if clock is unknown */
147 dev_warn(&ofdev->dev, "could not determine IPS clock\n");
148 clock = 0x3F * 5000000;
149 }
150 } else
151 clock = ppc_proc_freq;
152
153 /*
154 * Scale for a MII clock <= 2.5 MHz
155 * Note that only 6 bits (25:30) are available for MII speed.
156 */
157 speed = (clock + 4999999) / 5000000;
158 if (speed > 0x3F) {
159 speed = 0x3F;
160 dev_err(&ofdev->dev,
161 "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
162 clock / speed);
163 }
164
165 fec->mii_speed = speed << 1;
Scott Wood976de6a2007-10-02 10:55:58 -0500166
167 setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
168 setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
169 FEC_ECNTRL_ETHER_EN);
170 out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
Wolfgang Denk652f6782009-07-17 02:27:07 +0000171 clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);
Scott Wood976de6a2007-10-02 10:55:58 -0500172
173 new_bus->phy_mask = ~0;
174 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
175 if (!new_bus->irq)
176 goto out_unmap_regs;
177
Lennert Buytenhek18ee49d2008-10-01 15:41:33 +0000178 new_bus->parent = &ofdev->dev;
Scott Wood976de6a2007-10-02 10:55:58 -0500179 dev_set_drvdata(&ofdev->dev, new_bus);
180
Grant Likely61c7a082010-04-13 16:12:29 -0700181 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
Scott Wood976de6a2007-10-02 10:55:58 -0500182 if (ret)
183 goto out_free_irqs;
184
185 return 0;
186
187out_free_irqs:
188 dev_set_drvdata(&ofdev->dev, NULL);
189 kfree(new_bus->irq);
190out_unmap_regs:
191 iounmap(fec->fecp);
Scott Wooda86e2cb2008-05-02 13:42:41 -0500192out_res:
Scott Wood976de6a2007-10-02 10:55:58 -0500193out_fec:
194 kfree(fec);
195out_mii:
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700196 mdiobus_free(new_bus);
Scott Wood976de6a2007-10-02 10:55:58 -0500197out:
198 return ret;
199}
200
Grant Likely2dc11582010-08-06 09:25:50 -0600201static int fs_enet_mdio_remove(struct platform_device *ofdev)
Scott Wood976de6a2007-10-02 10:55:58 -0500202{
203 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
204 struct fec_info *fec = bus->priv;
205
206 mdiobus_unregister(bus);
207 dev_set_drvdata(&ofdev->dev, NULL);
208 kfree(bus->irq);
209 iounmap(fec->fecp);
210 kfree(fec);
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700211 mdiobus_free(bus);
Scott Wood976de6a2007-10-02 10:55:58 -0500212
213 return 0;
214}
215
216static struct of_device_id fs_enet_mdio_fec_match[] = {
217 {
218 .compatible = "fsl,pq1-fec-mdio",
219 },
Wolfgang Denk652f6782009-07-17 02:27:07 +0000220#if defined(CONFIG_PPC_MPC512x)
221 {
222 .compatible = "fsl,mpc5121-fec-mdio",
223 .data = mpc5xxx_get_bus_frequency,
224 },
225#endif
Scott Wood976de6a2007-10-02 10:55:58 -0500226 {},
227};
Anton Vorontsove72701a2009-10-14 14:54:52 -0700228MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
Scott Wood976de6a2007-10-02 10:55:58 -0500229
Grant Likely74888762011-02-22 21:05:51 -0700230static struct platform_driver fs_enet_fec_mdio_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700231 .driver = {
232 .name = "fsl-fec-mdio",
233 .owner = THIS_MODULE,
234 .of_match_table = fs_enet_mdio_fec_match,
235 },
Scott Wood976de6a2007-10-02 10:55:58 -0500236 .probe = fs_enet_mdio_probe,
237 .remove = fs_enet_mdio_remove,
238};
239
240static int fs_enet_mdio_fec_init(void)
241{
Grant Likely74888762011-02-22 21:05:51 -0700242 return platform_driver_register(&fs_enet_fec_mdio_driver);
Scott Wood976de6a2007-10-02 10:55:58 -0500243}
244
245static void fs_enet_mdio_fec_exit(void)
246{
Grant Likely74888762011-02-22 21:05:51 -0700247 platform_driver_unregister(&fs_enet_fec_mdio_driver);
Scott Wood976de6a2007-10-02 10:55:58 -0500248}
249
250module_init(fs_enet_mdio_fec_init);
251module_exit(fs_enet_mdio_fec_exit);