/*
* 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;
}
#ifdef CONFIG_GIANFAR
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
#ifdef CONFIG_UCC_GETH
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")) {
#ifdef CONFIG_GIANFAR
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")) {
#ifdef CONFIG_UCC_GETH
u32 id;
tbipa = ®s->utbipar;
if ((err = get_ucc_id_for_range(addr, addr + size, &id)))
goto err_free_irqs;
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);
