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Linux/drivers/net/ethernet/freescale/fs_enet/mii-fec.c

  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_platform.h>
 35 
 36 #include <asm/pgtable.h>
 37 #include <asm/irq.h>
 38 #include <asm/uaccess.h>
 39 #include <asm/mpc5xxx.h>
 40 
 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 
 52 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
 53 {
 54         struct fec_info* fec = bus->priv;
 55         struct fec __iomem *fecp = fec->fecp;
 56         int i, ret = -1;
 57 
 58         BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
 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 
 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         struct fec __iomem *fecp = fec->fecp;
 79         int i;
 80 
 81         /* this must never happen */
 82         BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
 83 
 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 
 98 static const struct of_device_id fs_enet_mdio_fec_match[];
 99 static int fs_enet_mdio_probe(struct platform_device *ofdev)
100 {
101         const struct of_device_id *match;
102         struct resource res;
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;
107 
108         match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
109         if (!match)
110                 return -EINVAL;
111         get_bus_freq = match->data;
112 
113         new_bus = mdiobus_alloc();
114         if (!new_bus)
115                 goto out;
116 
117         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
118         if (!fec)
119                 goto out_mii;
120 
121         new_bus->priv = fec;
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;
125 
126         ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
127         if (ret)
128                 goto out_res;
129 
130         snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
131 
132         fec->fecp = ioremap(res.start, resource_size(&res));
133         if (!fec->fecp) {
134                 ret = -ENOMEM;
135                 goto out_fec;
136         }
137 
138         if (get_bus_freq) {
139                 clock = get_bus_freq(ofdev->dev.of_node);
140                 if (!clock) {
141                         /* Use maximum divider if clock is unknown */
142                         dev_warn(&ofdev->dev, "could not determine IPS clock\n");
143                         clock = 0x3F * 5000000;
144                 }
145         } else
146                 clock = ppc_proc_freq;
147 
148         /*
149          * Scale for a MII clock <= 2.5 MHz
150          * Note that only 6 bits (25:30) are available for MII speed.
151          */
152         speed = (clock + 4999999) / 5000000;
153         if (speed > 0x3F) {
154                 speed = 0x3F;
155                 dev_err(&ofdev->dev,
156                         "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
157                         clock / speed);
158         }
159 
160         fec->mii_speed = speed << 1;
161 
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);
167 
168         new_bus->phy_mask = ~0;
169 
170         new_bus->parent = &ofdev->dev;
171         platform_set_drvdata(ofdev, new_bus);
172 
173         ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
174         if (ret)
175                 goto out_unmap_regs;
176 
177         return 0;
178 
179 out_unmap_regs:
180         iounmap(fec->fecp);
181 out_res:
182 out_fec:
183         kfree(fec);
184 out_mii:
185         mdiobus_free(new_bus);
186 out:
187         return ret;
188 }
189 
190 static int fs_enet_mdio_remove(struct platform_device *ofdev)
191 {
192         struct mii_bus *bus = platform_get_drvdata(ofdev);
193         struct fec_info *fec = bus->priv;
194 
195         mdiobus_unregister(bus);
196         iounmap(fec->fecp);
197         kfree(fec);
198         mdiobus_free(bus);
199 
200         return 0;
201 }
202 
203 static const struct of_device_id fs_enet_mdio_fec_match[] = {
204         {
205                 .compatible = "fsl,pq1-fec-mdio",
206         },
207 #if defined(CONFIG_PPC_MPC512x)
208         {
209                 .compatible = "fsl,mpc5121-fec-mdio",
210                 .data = mpc5xxx_get_bus_frequency,
211         },
212 #endif
213         {},
214 };
215 MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
216 
217 static struct platform_driver fs_enet_fec_mdio_driver = {
218         .driver = {
219                 .name = "fsl-fec-mdio",
220                 .of_match_table = fs_enet_mdio_fec_match,
221         },
222         .probe = fs_enet_mdio_probe,
223         .remove = fs_enet_mdio_remove,
224 };
225 
226 module_platform_driver(fs_enet_fec_mdio_driver);
227 

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