mdio-cavium.c
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2009-2016 Cavium, Inc.
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/io.h>
#include "mdio-cavium.h"
static void cavium_mdiobus_set_mode(struct cavium_mdiobus *p,
enum cavium_mdiobus_mode m)
{
union cvmx_smix_clk smi_clk;
if (m == p->mode)
return;
smi_clk.u64 = oct_mdio_readq(p->register_base + SMI_CLK);
smi_clk.s.mode = (m == C45) ? 1 : 0;
smi_clk.s.preamble = 1;
oct_mdio_writeq(smi_clk.u64, p->register_base + SMI_CLK);
p->mode = m;
}
static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
int phy_id, int regnum)
{
union cvmx_smix_cmd smi_cmd;
union cvmx_smix_wr_dat smi_wr;
int timeout = 1000;
cavium_mdiobus_set_mode(p, C45);
smi_wr.u64 = 0;
smi_wr.s.dat = regnum & 0xffff;
oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
regnum = (regnum >> 16) & 0x1f;
smi_cmd.u64 = 0;
smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_45_ADDRESS */
smi_cmd.s.phy_adr = phy_id;
smi_cmd.s.reg_adr = regnum;
oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
do {
/* Wait 1000 clocks so we don't saturate the RSL bus
* doing reads.
*/
__delay(1000);
smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
} while (smi_wr.s.pending && --timeout);
if (timeout <= 0)
return -EIO;
return 0;
}
int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
{
struct cavium_mdiobus *p = bus->priv;
union cvmx_smix_cmd smi_cmd;
union cvmx_smix_rd_dat smi_rd;
unsigned int op = 1; /* MDIO_CLAUSE_22_READ */
int timeout = 1000;
if (regnum & MII_ADDR_C45) {
int r = cavium_mdiobus_c45_addr(p, phy_id, regnum);
if (r < 0)
return r;
regnum = (regnum >> 16) & 0x1f;
op = 3; /* MDIO_CLAUSE_45_READ */
} else {
cavium_mdiobus_set_mode(p, C22);
}
smi_cmd.u64 = 0;
smi_cmd.s.phy_op = op;
smi_cmd.s.phy_adr = phy_id;
smi_cmd.s.reg_adr = regnum;
oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
do {
/* Wait 1000 clocks so we don't saturate the RSL bus
* doing reads.
*/
__delay(1000);
smi_rd.u64 = oct_mdio_readq(p->register_base + SMI_RD_DAT);
} while (smi_rd.s.pending && --timeout);
if (smi_rd.s.val)
return smi_rd.s.dat;
else
return -EIO;
}
EXPORT_SYMBOL(cavium_mdiobus_read);
int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
{
struct cavium_mdiobus *p = bus->priv;
union cvmx_smix_cmd smi_cmd;
union cvmx_smix_wr_dat smi_wr;
unsigned int op = 0; /* MDIO_CLAUSE_22_WRITE */
int timeout = 1000;
if (regnum & MII_ADDR_C45) {
int r = cavium_mdiobus_c45_addr(p, phy_id, regnum);
if (r < 0)
return r;
regnum = (regnum >> 16) & 0x1f;
op = 1; /* MDIO_CLAUSE_45_WRITE */
} else {
cavium_mdiobus_set_mode(p, C22);
}
smi_wr.u64 = 0;
smi_wr.s.dat = val;
oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);
smi_cmd.u64 = 0;
smi_cmd.s.phy_op = op;
smi_cmd.s.phy_adr = phy_id;
smi_cmd.s.reg_adr = regnum;
oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);
do {
/* Wait 1000 clocks so we don't saturate the RSL bus
* doing reads.
*/
__delay(1000);
smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
} while (smi_wr.s.pending && --timeout);
if (timeout <= 0)
return -EIO;
return 0;
}
EXPORT_SYMBOL(cavium_mdiobus_write);
MODULE_DESCRIPTION("Common code for OCTEON and Thunder MDIO bus drivers");
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");