2 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
4 * Copyright (c) 2003 Intracom S.A.
5 * by Pantelis Antoniou <panto@intracom.gr>
7 * 2005 (c) MontaVista Software, Inc.
8 * Vitaly Bordug <vbordug@ru.mvista.com>
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.
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_platform.h>
35 #include <linux/pgtable.h>
38 #include <linux/uaccess.h>
39 #include <asm/mpc5xxx.h>
44 /* Make MII read/write commands for the FEC.
46 #define mk_mii_read(REG) (0x60020000 | ((REG & 0x1f) << 18))
47 #define mk_mii_write(REG, VAL) (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
50 #define FEC_MII_LOOPS 10000
52 static int fs_enet_fec_mii_read(struct mii_bus
*bus
, int phy_id
, int location
)
54 struct fec_info
* fec
= bus
->priv
;
55 struct fec __iomem
*fecp
= fec
->fecp
;
58 BUG_ON((in_be32(&fecp
->fec_r_cntrl
) & FEC_RCNTRL_MII_MODE
) == 0);
60 /* Add PHY address to register command. */
61 out_be32(&fecp
->fec_mii_data
, (phy_id
<< 23) | mk_mii_read(location
));
63 for (i
= 0; i
< FEC_MII_LOOPS
; i
++)
64 if ((in_be32(&fecp
->fec_ievent
) & FEC_ENET_MII
) != 0)
67 if (i
< FEC_MII_LOOPS
) {
68 out_be32(&fecp
->fec_ievent
, FEC_ENET_MII
);
69 ret
= in_be32(&fecp
->fec_mii_data
) & 0xffff;
75 static int fs_enet_fec_mii_write(struct mii_bus
*bus
, int phy_id
, int location
, u16 val
)
77 struct fec_info
* fec
= bus
->priv
;
78 struct fec __iomem
*fecp
= fec
->fecp
;
81 /* this must never happen */
82 BUG_ON((in_be32(&fecp
->fec_r_cntrl
) & FEC_RCNTRL_MII_MODE
) == 0);
84 /* Add PHY address to register command. */
85 out_be32(&fecp
->fec_mii_data
, (phy_id
<< 23) | mk_mii_write(location
, val
));
87 for (i
= 0; i
< FEC_MII_LOOPS
; i
++)
88 if ((in_be32(&fecp
->fec_ievent
) & FEC_ENET_MII
) != 0)
91 if (i
< FEC_MII_LOOPS
)
92 out_be32(&fecp
->fec_ievent
, FEC_ENET_MII
);
98 static const struct of_device_id fs_enet_mdio_fec_match
[];
99 static int fs_enet_mdio_probe(struct platform_device
*ofdev
)
101 const struct of_device_id
*match
;
103 struct mii_bus
*new_bus
;
104 struct fec_info
*fec
;
105 int (*get_bus_freq
)(struct device_node
*);
106 int ret
= -ENOMEM
, clock
, speed
;
108 match
= of_match_device(fs_enet_mdio_fec_match
, &ofdev
->dev
);
111 get_bus_freq
= match
->data
;
113 new_bus
= mdiobus_alloc();
117 fec
= kzalloc(sizeof(struct fec_info
), GFP_KERNEL
);
122 new_bus
->name
= "FEC MII Bus";
123 new_bus
->read
= &fs_enet_fec_mii_read
;
124 new_bus
->write
= &fs_enet_fec_mii_write
;
126 ret
= of_address_to_resource(ofdev
->dev
.of_node
, 0, &res
);
130 snprintf(new_bus
->id
, MII_BUS_ID_SIZE
, "%x", res
.start
);
132 fec
->fecp
= ioremap(res
.start
, resource_size(&res
));
139 clock
= get_bus_freq(ofdev
->dev
.of_node
);
141 /* Use maximum divider if clock is unknown */
142 dev_warn(&ofdev
->dev
, "could not determine IPS clock\n");
143 clock
= 0x3F * 5000000;
146 clock
= ppc_proc_freq
;
149 * Scale for a MII clock <= 2.5 MHz
150 * Note that only 6 bits (25:30) are available for MII speed.
152 speed
= (clock
+ 4999999) / 5000000;
156 "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
160 fec
->mii_speed
= speed
<< 1;
162 setbits32(&fec
->fecp
->fec_r_cntrl
, FEC_RCNTRL_MII_MODE
);
163 setbits32(&fec
->fecp
->fec_ecntrl
, FEC_ECNTRL_PINMUX
|
164 FEC_ECNTRL_ETHER_EN
);
165 out_be32(&fec
->fecp
->fec_ievent
, FEC_ENET_MII
);
166 clrsetbits_be32(&fec
->fecp
->fec_mii_speed
, 0x7E, fec
->mii_speed
);
168 new_bus
->phy_mask
= ~0;
170 new_bus
->parent
= &ofdev
->dev
;
171 platform_set_drvdata(ofdev
, new_bus
);
173 ret
= of_mdiobus_register(new_bus
, ofdev
->dev
.of_node
);
185 mdiobus_free(new_bus
);
190 static int fs_enet_mdio_remove(struct platform_device
*ofdev
)
192 struct mii_bus
*bus
= platform_get_drvdata(ofdev
);
193 struct fec_info
*fec
= bus
->priv
;
195 mdiobus_unregister(bus
);
203 static const struct of_device_id fs_enet_mdio_fec_match
[] = {
205 .compatible
= "fsl,pq1-fec-mdio",
207 #if defined(CONFIG_PPC_MPC512x)
209 .compatible
= "fsl,mpc5121-fec-mdio",
210 .data
= mpc5xxx_get_bus_frequency
,
215 MODULE_DEVICE_TABLE(of
, fs_enet_mdio_fec_match
);
217 static struct platform_driver fs_enet_fec_mdio_driver
= {
219 .name
= "fsl-fec-mdio",
220 .of_match_table
= fs_enet_mdio_fec_match
,
222 .probe
= fs_enet_mdio_probe
,
223 .remove
= fs_enet_mdio_remove
,
226 module_platform_driver(fs_enet_fec_mdio_driver
);
227 MODULE_LICENSE("GPL");