/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
http://github.com/mirrors/linux · C · 226 lines · 162 code · 41 blank · 23 comment · 19 complexity · 9d670a3599ce734c34cc14b36b68c5b1 MD5 · raw file
- /*
- * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
- *
- * Copyright (c) 2003 Intracom S.A.
- * by Pantelis Antoniou <panto@intracom.gr>
- *
- * 2005 (c) MontaVista Software, Inc.
- * Vitaly Bordug <vbordug@ru.mvista.com>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
- */
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/ptrace.h>
- #include <linux/errno.h>
- #include <linux/ioport.h>
- #include <linux/slab.h>
- #include <linux/interrupt.h>
- #include <linux/delay.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include <linux/spinlock.h>
- #include <linux/mii.h>
- #include <linux/ethtool.h>
- #include <linux/bitops.h>
- #include <linux/platform_device.h>
- #include <linux/of_address.h>
- #include <linux/of_platform.h>
- #include <asm/pgtable.h>
- #include <asm/irq.h>
- #include <linux/uaccess.h>
- #include <asm/mpc5xxx.h>
- #include "fs_enet.h"
- #include "fec.h"
- /* Make MII read/write commands for the FEC.
- */
- #define mk_mii_read(REG) (0x60020000 | ((REG & 0x1f) << 18))
- #define mk_mii_write(REG, VAL) (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
- #define mk_mii_end 0
- #define FEC_MII_LOOPS 10000
- static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
- {
- struct fec_info* fec = bus->priv;
- struct fec __iomem *fecp = fec->fecp;
- int i, ret = -1;
- BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
- /* Add PHY address to register command. */
- out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
- for (i = 0; i < FEC_MII_LOOPS; i++)
- if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
- break;
- if (i < FEC_MII_LOOPS) {
- out_be32(&fecp->fec_ievent, FEC_ENET_MII);
- ret = in_be32(&fecp->fec_mii_data) & 0xffff;
- }
- return ret;
- }
- static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
- {
- struct fec_info* fec = bus->priv;
- struct fec __iomem *fecp = fec->fecp;
- int i;
- /* this must never happen */
- BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
- /* Add PHY address to register command. */
- out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
- for (i = 0; i < FEC_MII_LOOPS; i++)
- if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
- break;
- if (i < FEC_MII_LOOPS)
- out_be32(&fecp->fec_ievent, FEC_ENET_MII);
- return 0;
- }
- static const struct of_device_id fs_enet_mdio_fec_match[];
- static int fs_enet_mdio_probe(struct platform_device *ofdev)
- {
- const struct of_device_id *match;
- struct resource res;
- struct mii_bus *new_bus;
- struct fec_info *fec;
- int (*get_bus_freq)(struct device_node *);
- int ret = -ENOMEM, clock, speed;
- match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
- if (!match)
- return -EINVAL;
- get_bus_freq = match->data;
- new_bus = mdiobus_alloc();
- if (!new_bus)
- goto out;
- fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
- if (!fec)
- goto out_mii;
- new_bus->priv = fec;
- new_bus->name = "FEC MII Bus";
- new_bus->read = &fs_enet_fec_mii_read;
- new_bus->write = &fs_enet_fec_mii_write;
- ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
- if (ret)
- goto out_res;
- snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
- fec->fecp = ioremap(res.start, resource_size(&res));
- if (!fec->fecp) {
- ret = -ENOMEM;
- goto out_fec;
- }
- if (get_bus_freq) {
- clock = get_bus_freq(ofdev->dev.of_node);
- if (!clock) {
- /* Use maximum divider if clock is unknown */
- dev_warn(&ofdev->dev, "could not determine IPS clock\n");
- clock = 0x3F * 5000000;
- }
- } else
- clock = ppc_proc_freq;
- /*
- * Scale for a MII clock <= 2.5 MHz
- * Note that only 6 bits (25:30) are available for MII speed.
- */
- speed = (clock + 4999999) / 5000000;
- if (speed > 0x3F) {
- speed = 0x3F;
- dev_err(&ofdev->dev,
- "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
- clock / speed);
- }
- fec->mii_speed = speed << 1;
- setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
- setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
- FEC_ECNTRL_ETHER_EN);
- out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
- clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);
- new_bus->phy_mask = ~0;
- new_bus->parent = &ofdev->dev;
- platform_set_drvdata(ofdev, new_bus);
- ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
- if (ret)
- goto out_unmap_regs;
- return 0;
- out_unmap_regs:
- iounmap(fec->fecp);
- out_res:
- out_fec:
- kfree(fec);
- out_mii:
- mdiobus_free(new_bus);
- out:
- return ret;
- }
- static int fs_enet_mdio_remove(struct platform_device *ofdev)
- {
- struct mii_bus *bus = platform_get_drvdata(ofdev);
- struct fec_info *fec = bus->priv;
- mdiobus_unregister(bus);
- iounmap(fec->fecp);
- kfree(fec);
- mdiobus_free(bus);
- return 0;
- }
- static const struct of_device_id fs_enet_mdio_fec_match[] = {
- {
- .compatible = "fsl,pq1-fec-mdio",
- },
- #if defined(CONFIG_PPC_MPC512x)
- {
- .compatible = "fsl,mpc5121-fec-mdio",
- .data = mpc5xxx_get_bus_frequency,
- },
- #endif
- {},
- };
- MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
- static struct platform_driver fs_enet_fec_mdio_driver = {
- .driver = {
- .name = "fsl-fec-mdio",
- .of_match_table = fs_enet_mdio_fec_match,
- },
- .probe = fs_enet_mdio_probe,
- .remove = fs_enet_mdio_remove,
- };
- module_platform_driver(fs_enet_fec_mdio_driver);