diff options
Diffstat (limited to 'drivers/net/ethernet/freescale/fsl_pq_mdio.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/fsl_pq_mdio.c | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/fsl_pq_mdio.c b/drivers/net/ethernet/freescale/fsl_pq_mdio.c new file mode 100644 index 00000000000..52f4e8ad48e --- /dev/null +++ b/drivers/net/ethernet/freescale/fsl_pq_mdio.c @@ -0,0 +1,494 @@ +/* + * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation + * Provides Bus interface for MIIM regs + * + * Author: Andy Fleming <afleming@freescale.com> + * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com> + * + * Copyright 2002-2004, 2008-2009 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_address.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" + +struct fsl_pq_mdio_priv { + void __iomem *map; + struct fsl_pq_mdio __iomem *regs; +}; + +/* + * 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; +} + +static struct fsl_pq_mdio __iomem *fsl_pq_mdio_get_regs(struct mii_bus *bus) +{ + struct fsl_pq_mdio_priv *priv = bus->priv; + + return priv->regs; +} + +/* + * 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 = fsl_pq_mdio_get_regs(bus); + + /* 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 = fsl_pq_mdio_get_regs(bus); + + /* 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 = fsl_pq_mdio_get_regs(bus); + 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 device_node *np) +{ + 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. + */ + if(of_device_is_compatible(np, "fsl,gianfar-mdio") || + of_device_is_compatible(np, "fsl,gianfar-tbi") || + of_device_is_compatible(np, "gianfar")) { + enet_regs = (struct gfar __iomem *)regs; + return &enet_regs->tbipa; + } else if (of_device_is_compatible(np, "fsl,etsec2-mdio") || + of_device_is_compatible(np, "fsl,etsec2-tbi")) { + return of_iomap(np, 1); + } else + return NULL; +} +#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 platform_device *ofdev) +{ + struct device_node *np = ofdev->dev.of_node; + struct device_node *tbi; + struct fsl_pq_mdio_priv *priv; + struct fsl_pq_mdio __iomem *regs = NULL; + void __iomem *map; + u32 __iomem *tbipa; + struct mii_bus *new_bus; + int tbiaddr = -1; + const u32 *addrp; + u64 addr = 0, size = 0; + int err; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + new_bus = mdiobus_alloc(); + if (!new_bus) { + err = -ENOMEM; + goto err_free_priv; + } + + 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, + new_bus->priv = priv; + fsl_pq_mdio_bus_name(new_bus->id, np); + + addrp = of_get_address(np, 0, &size, NULL); + if (!addrp) { + err = -EINVAL; + goto err_free_bus; + } + + /* Set the PHY base address */ + addr = of_translate_address(np, addrp); + if (addr == OF_BAD_ADDR) { + err = -EINVAL; + goto err_free_bus; + } + + map = ioremap(addr, size); + if (!map) { + err = -ENOMEM; + goto err_free_bus; + } + priv->map = map; + + if (of_device_is_compatible(np, "fsl,gianfar-mdio") || + of_device_is_compatible(np, "fsl,gianfar-tbi") || + of_device_is_compatible(np, "fsl,ucc-mdio") || + of_device_is_compatible(np, "ucc_geth_phy")) + map -= offsetof(struct fsl_pq_mdio, miimcfg); + regs = map; + priv->regs = 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, "fsl,etsec2-mdio") || + of_device_is_compatible(np, "fsl,etsec2-tbi") || + of_device_is_compatible(np, "gianfar")) { +#if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE) + tbipa = get_gfar_tbipa(regs, np); + if (!tbipa) { + err = -EINVAL; + goto err_free_irqs; + } +#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(priv->map); +err_free_bus: + kfree(new_bus); +err_free_priv: + kfree(priv); + return err; +} + + +static int fsl_pq_mdio_remove(struct platform_device *ofdev) +{ + struct device *device = &ofdev->dev; + struct mii_bus *bus = dev_get_drvdata(device); + struct fsl_pq_mdio_priv *priv = bus->priv; + + mdiobus_unregister(bus); + + dev_set_drvdata(device, NULL); + + iounmap(priv->map); + bus->priv = NULL; + mdiobus_free(bus); + kfree(priv); + + 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", + }, + { + .compatible = "fsl,etsec2-tbi", + }, + { + .compatible = "fsl,etsec2-mdio", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match); + +static struct platform_driver fsl_pq_mdio_driver = { + .driver = { + .name = "fsl-pq_mdio", + .owner = THIS_MODULE, + .of_match_table = fsl_pq_mdio_match, + }, + .probe = fsl_pq_mdio_probe, + .remove = fsl_pq_mdio_remove, +}; + +int __init fsl_pq_mdio_init(void) +{ + return platform_driver_register(&fsl_pq_mdio_driver); +} +module_init(fsl_pq_mdio_init); + +void fsl_pq_mdio_exit(void) +{ + platform_driver_unregister(&fsl_pq_mdio_driver); +} +module_exit(fsl_pq_mdio_exit); +MODULE_LICENSE("GPL"); |