mirror of
https://github.com/torvalds/linux.git
synced 2024-11-13 23:51:39 +00:00
9f1a1fca35
It is the next patch which is fixing missing header which were removed from prom.h. Related patches: "of/address: Clean up function declarations" (sha1 id22ae782f8) "of: Fix missing includes" (sha1 idf1ca09b2b) Signed-off-by: Michal Simek <monstr@monstr.eu> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
|
|
* MDIO bus driver for the Xilinx TEMAC device
|
|
*
|
|
* Copyright (c) 2009 Secret Lab Technologies, Ltd.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/phy.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of_mdio.h>
|
|
|
|
#include "ll_temac.h"
|
|
|
|
/* ---------------------------------------------------------------------
|
|
* MDIO Bus functions
|
|
*/
|
|
static int temac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
|
|
{
|
|
struct temac_local *lp = bus->priv;
|
|
u32 rc;
|
|
|
|
/* Write the PHY address to the MIIM Access Initiator register.
|
|
* When the transfer completes, the PHY register value will appear
|
|
* in the LSW0 register */
|
|
mutex_lock(&lp->indirect_mutex);
|
|
temac_iow(lp, XTE_LSW0_OFFSET, (phy_id << 5) | reg);
|
|
rc = temac_indirect_in32(lp, XTE_MIIMAI_OFFSET);
|
|
mutex_unlock(&lp->indirect_mutex);
|
|
|
|
dev_dbg(lp->dev, "temac_mdio_read(phy_id=%i, reg=%x) == %x\n",
|
|
phy_id, reg, rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int temac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
|
|
{
|
|
struct temac_local *lp = bus->priv;
|
|
|
|
dev_dbg(lp->dev, "temac_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
|
|
phy_id, reg, val);
|
|
|
|
/* First write the desired value into the write data register
|
|
* and then write the address into the access initiator register
|
|
*/
|
|
mutex_lock(&lp->indirect_mutex);
|
|
temac_indirect_out32(lp, XTE_MGTDR_OFFSET, val);
|
|
temac_indirect_out32(lp, XTE_MIIMAI_OFFSET, (phy_id << 5) | reg);
|
|
mutex_unlock(&lp->indirect_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int temac_mdio_setup(struct temac_local *lp, struct device_node *np)
|
|
{
|
|
struct mii_bus *bus;
|
|
const u32 *bus_hz;
|
|
int clk_div;
|
|
int rc, size;
|
|
struct resource res;
|
|
|
|
/* Calculate a reasonable divisor for the clock rate */
|
|
clk_div = 0x3f; /* worst-case default setting */
|
|
bus_hz = of_get_property(np, "clock-frequency", &size);
|
|
if (bus_hz && size >= sizeof(*bus_hz)) {
|
|
clk_div = (*bus_hz) / (2500 * 1000 * 2) - 1;
|
|
if (clk_div < 1)
|
|
clk_div = 1;
|
|
if (clk_div > 0x3f)
|
|
clk_div = 0x3f;
|
|
}
|
|
|
|
/* Enable the MDIO bus by asserting the enable bit and writing
|
|
* in the clock config */
|
|
mutex_lock(&lp->indirect_mutex);
|
|
temac_indirect_out32(lp, XTE_MC_OFFSET, 1 << 6 | clk_div);
|
|
mutex_unlock(&lp->indirect_mutex);
|
|
|
|
bus = mdiobus_alloc();
|
|
if (!bus)
|
|
return -ENOMEM;
|
|
|
|
of_address_to_resource(np, 0, &res);
|
|
snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
|
|
(unsigned long long)res.start);
|
|
bus->priv = lp;
|
|
bus->name = "Xilinx TEMAC MDIO";
|
|
bus->read = temac_mdio_read;
|
|
bus->write = temac_mdio_write;
|
|
bus->parent = lp->dev;
|
|
bus->irq = lp->mdio_irqs; /* preallocated IRQ table */
|
|
|
|
lp->mii_bus = bus;
|
|
|
|
rc = of_mdiobus_register(bus, np);
|
|
if (rc)
|
|
goto err_register;
|
|
|
|
mutex_lock(&lp->indirect_mutex);
|
|
dev_dbg(lp->dev, "MDIO bus registered; MC:%x\n",
|
|
temac_indirect_in32(lp, XTE_MC_OFFSET));
|
|
mutex_unlock(&lp->indirect_mutex);
|
|
return 0;
|
|
|
|
err_register:
|
|
mdiobus_free(bus);
|
|
return rc;
|
|
}
|
|
|
|
void temac_mdio_teardown(struct temac_local *lp)
|
|
{
|
|
mdiobus_unregister(lp->mii_bus);
|
|
kfree(lp->mii_bus->irq);
|
|
mdiobus_free(lp->mii_bus);
|
|
lp->mii_bus = NULL;
|
|
}
|
|
|