/* * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation * Provides Bus interface for MIIM regs * * Author: Andy Fleming <afleming@freescale.com> * * Copyright (c) 2002-2004,2008 Freescale Semiconductor, Inc. * * Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips) * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/unistd.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/spinlock.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/crc32.h> #include <linux/mii.h> #include <linux/phy.h> #include <linux/of.h> #include <linux/of_mdio.h> #include <linux/of_platform.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/uaccess.h> #include <asm/ucc.h> #include "gianfar.h" #include "fsl_pq_mdio.h" /* * Write value to the PHY at mii_id at register regnum, * on the bus attached to the local interface, which may be different from the * generic mdio bus (tied to a single interface), waiting until the write is * done before returning. This is helpful in programming interfaces like * the TBI which control interfaces like onchip SERDES and are always tied to * the local mdio pins, which may not be the same as system mdio bus, used for * controlling the external PHYs, for example. */ int fsl_pq_local_mdio_write(struct fsl_pq_mdio __iomem *regs, int mii_id, int regnum, u16 value) { /* Set the PHY address and the register address we want to write */ out_be32(®s->miimadd, (mii_id << 8) | regnum); /* Write out the value we want */ out_be32(®s->miimcon, value); /* Wait for the transaction to finish */ while (in_be32(®s->miimind) & MIIMIND_BUSY) cpu_relax(); return 0; } /* * Read the bus for PHY at addr mii_id, register regnum, and * return the value. Clears miimcom first. All PHY operation * done on the bus attached to the local interface, * which may be different from the generic mdio bus * This is helpful in programming interfaces like * the TBI which, in turn, control interfaces like onchip SERDES * and are always tied to the local mdio pins, which may not be the * same as system mdio bus, used for controlling the external PHYs, for eg. */ int fsl_pq_local_mdio_read(struct fsl_pq_mdio __iomem *regs, int mii_id, int regnum) { u16 value; /* Set the PHY address and the register address we want to read */ out_be32(®s->miimadd, (mii_id << 8) | regnum); /* Clear miimcom, and then initiate a read */ out_be32(®s->miimcom, 0); out_be32(®s->miimcom, MII_READ_COMMAND); /* Wait for the transaction to finish */ while (in_be32(®s->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY)) cpu_relax(); /* Grab the value of the register from miimstat */ value = in_be32(®s->miimstat); return value; } /* * Write value to the PHY at mii_id at register regnum, * on the bus, waiting until the write is done before returning. */ int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) { struct fsl_pq_mdio __iomem *regs = (void __iomem *)bus->priv; /* Write to the local MII regs */ return(fsl_pq_local_mdio_write(regs, mii_id, regnum, value)); } /* * Read the bus for PHY at addr mii_id, register regnum, and * return the value. Clears miimcom first. */ int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum) { struct fsl_pq_mdio __iomem *regs = (void __iomem *)bus->priv; /* Read the local MII regs */ return(fsl_pq_local_mdio_read(regs, mii_id, regnum)); } /* Reset the MIIM registers, and wait for the bus to free */ static int fsl_pq_mdio_reset(struct mii_bus *bus) { struct fsl_pq_mdio __iomem *regs = (void __iomem *)bus->priv; int timeout = PHY_INIT_TIMEOUT; mutex_lock(&bus->mdio_lock); /* Reset the management interface */ out_be32(®s->miimcfg, MIIMCFG_RESET); /* Setup the MII Mgmt clock speed */ out_be32(®s->miimcfg, MIIMCFG_INIT_VALUE); /* Wait until the bus is free */ while ((in_be32(®s->miimind) & MIIMIND_BUSY) && timeout--) cpu_relax(); mutex_unlock(&bus->mdio_lock); if (timeout < 0) { printk(KERN_ERR "%s: The MII Bus is stuck!\n", bus->name); return -EBUSY; } return 0; } void fsl_pq_mdio_bus_name(char *name, struct device_node *np) { const u32 *addr; u64 taddr = OF_BAD_ADDR; addr = of_get_address(np, 0, NULL, NULL); if (addr) taddr = of_translate_address(np, addr); snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name, (unsigned long long)taddr); } EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name); /* Scan the bus in reverse, looking for an empty spot */ static int fsl_pq_mdio_find_free(struct mii_bus *new_bus) { int i; for (i = PHY_MAX_ADDR; i > 0; i--) { u32 phy_id; if (get_phy_id(new_bus, i, &phy_id)) return -1; if (phy_id == 0xffffffff) break; } return i; } #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE) static u32 __iomem *get_gfar_tbipa(struct fsl_pq_mdio __iomem *regs) { struct gfar __iomem *enet_regs; /* * This is mildly evil, but so is our hardware for doing this. * Also, we have to cast back to struct gfar because of * definition weirdness done in gianfar.h. */ enet_regs = (struct gfar __iomem *) ((char __iomem *)regs - offsetof(struct gfar, gfar_mii_regs)); return &enet_regs->tbipa; } #endif #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE) static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id) { struct device_node *np = NULL; int err = 0; for_each_compatible_node(np, NULL, "ucc_geth") { struct resource tempres; err = of_address_to_resource(np, 0, &tempres); if (err) continue; /* if our mdio regs fall within this UCC regs range */ if ((start >= tempres.start) && (end <= tempres.end)) { /* Find the id of the UCC */ const u32 *id; id = of_get_property(np, "cell-index", NULL); if (!id) { id = of_get_property(np, "device-id", NULL); if (!id) continue; } *ucc_id = *id; return 0; } } if (err) return err; else return -EINVAL; } #endif static int fsl_pq_mdio_probe(struct of_device *ofdev, const struct of_device_id *match) { struct device_node *np = ofdev->node; struct device_node *tbi; struct fsl_pq_mdio __iomem *regs; u32 __iomem *tbipa; struct mii_bus *new_bus; int tbiaddr = -1; u64 addr, size; int err = 0; new_bus = mdiobus_alloc(); if (NULL == new_bus) return -ENOMEM; new_bus->name = "Freescale PowerQUICC MII Bus", new_bus->read = &fsl_pq_mdio_read, new_bus->write = &fsl_pq_mdio_write, new_bus->reset = &fsl_pq_mdio_reset, fsl_pq_mdio_bus_name(new_bus->id, np); /* Set the PHY base address */ addr = of_translate_address(np, of_get_address(np, 0, &size, NULL)); regs = ioremap(addr, size); if (NULL == regs) { err = -ENOMEM; goto err_free_bus; } new_bus->priv = (void __force *)regs; new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL); if (NULL == new_bus->irq) { err = -ENOMEM; goto err_unmap_regs; } new_bus->parent = &ofdev->dev; dev_set_drvdata(&ofdev->dev, new_bus); if (of_device_is_compatible(np, "fsl,gianfar-mdio") || of_device_is_compatible(np, "fsl,gianfar-tbi") || of_device_is_compatible(np, "gianfar")) { #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE) tbipa = get_gfar_tbipa(regs); #else err = -ENODEV; goto err_free_irqs; #endif } else if (of_device_is_compatible(np, "fsl,ucc-mdio") || of_device_is_compatible(np, "ucc_geth_phy")) { #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE) u32 id; static u32 mii_mng_master; tbipa = ®s->utbipar; if ((err = get_ucc_id_for_range(addr, addr + size, &id))) goto err_free_irqs; if (!mii_mng_master) { mii_mng_master = id; ucc_set_qe_mux_mii_mng(id - 1); } #else err = -ENODEV; goto err_free_irqs; #endif } else { err = -ENODEV; goto err_free_irqs; } for_each_child_of_node(np, tbi) { if (!strncmp(tbi->type, "tbi-phy", 8)) break; } if (tbi) { const u32 *prop = of_get_property(tbi, "reg", NULL); if (prop) tbiaddr = *prop; } if (tbiaddr == -1) { out_be32(tbipa, 0); tbiaddr = fsl_pq_mdio_find_free(new_bus); } /* * We define TBIPA at 0 to be illegal, opting to fail for boards that * have PHYs at 1-31, rather than change tbipa and rescan. */ if (tbiaddr == 0) { err = -EBUSY; goto err_free_irqs; } out_be32(tbipa, tbiaddr); err = of_mdiobus_register(new_bus, np); if (err) { printk (KERN_ERR "%s: Cannot register as MDIO bus\n", new_bus->name); goto err_free_irqs; } return 0; err_free_irqs: kfree(new_bus->irq); err_unmap_regs: iounmap(regs); err_free_bus: kfree(new_bus); return err; } static int fsl_pq_mdio_remove(struct of_device *ofdev) { struct device *device = &ofdev->dev; struct mii_bus *bus = dev_get_drvdata(device); mdiobus_unregister(bus); dev_set_drvdata(device, NULL); iounmap((void __iomem *)bus->priv); bus->priv = NULL; mdiobus_free(bus); return 0; } static struct of_device_id fsl_pq_mdio_match[] = { { .type = "mdio", .compatible = "ucc_geth_phy", }, { .type = "mdio", .compatible = "gianfar", }, { .compatible = "fsl,ucc-mdio", }, { .compatible = "fsl,gianfar-tbi", }, { .compatible = "fsl,gianfar-mdio", }, {}, }; static struct of_platform_driver fsl_pq_mdio_driver = { .name = "fsl-pq_mdio", .probe = fsl_pq_mdio_probe, .remove = fsl_pq_mdio_remove, .match_table = fsl_pq_mdio_match, }; int __init fsl_pq_mdio_init(void) { return of_register_platform_driver(&fsl_pq_mdio_driver); } module_init(fsl_pq_mdio_init); void fsl_pq_mdio_exit(void) { of_unregister_platform_driver(&fsl_pq_mdio_driver); } module_exit(fsl_pq_mdio_exit);