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NET: Support clause 45 MDIO commands at the MDIO bus level

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IEEE 802.3ae clause 45 specifies a somewhat modified MDIO protocol
for use by 10GIGE phys. The main change is a 21 bit address split into
a 5 bit device ID and a 16 bit register offset. The definition is designed
so that normal and extended devices can run on the same MDIO bus.

Extend mdio-bitbang to do the new protocol. At the MDIO bus level the
protocol is requested by or'ing MII_ADDR_C45 into the register offset.

Make phy_read/phy_write/etc pass a full 32 bit register offset.

This does not attempt to make the phy layer support C45 style PHYs, just
to provide the MDIO bus support.

Tested against a Broadcom 10GE phy with ID 0x206034, and several
Broadcom 10/100/1000 Phys in normal mode.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Gunthorpe 2010-03-09 09:17:42 +00:00 committed by David S. Miller
parent 23606cf5d1
commit abf35df215
3 changed files with 61 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
drivers/net/phy/mdio-bitbang.c
View File

@ -23,8 +23,13 @@
#include <linux/types.h>
#include <linux/delay.h>
#define MDIO_READ 1
#define MDIO_WRITE 0
#define MDIO_READ 2
#define MDIO_WRITE 1
#define MDIO_C45 (1<<15)
#define MDIO_C45_ADDR (MDIO_C45 | 0)
#define MDIO_C45_READ (MDIO_C45 | 3)
#define MDIO_C45_WRITE (MDIO_C45 | 1)
#define MDIO_SETUP_TIME 10
#define MDIO_HOLD_TIME 10
@ -90,7 +95,7 @@ static u16 mdiobb_get_num(struct mdiobb_ctrl *ctrl, int bits)
/* Utility to send the preamble, address, and
* register (common to read and write).
*/
static void mdiobb_cmd(struct mdiobb_ctrl *ctrl, int read, u8 phy, u8 reg)
static void mdiobb_cmd(struct mdiobb_ctrl *ctrl, int op, u8 phy, u8 reg)
{
const struct mdiobb_ops *ops = ctrl->ops;
int i;
@ -109,23 +114,56 @@ static void mdiobb_cmd(struct mdiobb_ctrl *ctrl, int read, u8 phy, u8 reg)
for (i = 0; i < 32; i++)
mdiobb_send_bit(ctrl, 1);
/* send the start bit (01) and the read opcode (10) or write (10) */
/* send the start bit (01) and the read opcode (10) or write (10).
Clause 45 operation uses 00 for the start and 11, 10 for
read/write */
mdiobb_send_bit(ctrl, 0);
mdiobb_send_bit(ctrl, 1);
mdiobb_send_bit(ctrl, read);
mdiobb_send_bit(ctrl, !read);
if (op & MDIO_C45)
mdiobb_send_bit(ctrl, 0);
else
mdiobb_send_bit(ctrl, 1);
mdiobb_send_bit(ctrl, (op >> 1) & 1);
mdiobb_send_bit(ctrl, (op >> 0) & 1);
mdiobb_send_num(ctrl, phy, 5);
mdiobb_send_num(ctrl, reg, 5);
}
/* In clause 45 mode all commands are prefixed by MDIO_ADDR to specify the
lower 16 bits of the 21 bit address. This transfer is done identically to a
MDIO_WRITE except for a different code. To enable clause 45 mode or
MII_ADDR_C45 into the address. Theoretically clause 45 and normal devices
can exist on the same bus. Normal devices should ignore the MDIO_ADDR
phase. */
static int mdiobb_cmd_addr(struct mdiobb_ctrl *ctrl, int phy, u32 addr)
{
unsigned int dev_addr = (addr >> 16) & 0x1F;
unsigned int reg = addr & 0xFFFF;
mdiobb_cmd(ctrl, MDIO_C45_ADDR, phy, dev_addr);
/* send the turnaround (10) */
mdiobb_send_bit(ctrl, 1);
mdiobb_send_bit(ctrl, 0);
mdiobb_send_num(ctrl, reg, 16);
ctrl->ops->set_mdio_dir(ctrl, 0);
mdiobb_get_bit(ctrl);
return dev_addr;
}
static int mdiobb_read(struct mii_bus *bus, int phy, int reg)
{
struct mdiobb_ctrl *ctrl = bus->priv;
int ret, i;
mdiobb_cmd(ctrl, MDIO_READ, phy, reg);
if (reg & MII_ADDR_C45) {
reg = mdiobb_cmd_addr(ctrl, phy, reg);
mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg);
} else
mdiobb_cmd(ctrl, MDIO_READ, phy, reg);
ctrl->ops->set_mdio_dir(ctrl, 0);
/* check the turnaround bit: the PHY should be driving it to zero */
@ -148,7 +186,11 @@ static int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val)
{
struct mdiobb_ctrl *ctrl = bus->priv;
mdiobb_cmd(ctrl, MDIO_WRITE, phy, reg);
if (reg & MII_ADDR_C45) {
reg = mdiobb_cmd_addr(ctrl, phy, reg);
mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg);
} else
mdiobb_cmd(ctrl, MDIO_WRITE, phy, reg);
/* send the turnaround (10) */
mdiobb_send_bit(ctrl, 1);

4
drivers/net/phy/mdio_bus.c
View File

@ -208,7 +208,7 @@ EXPORT_SYMBOL(mdiobus_scan);
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum)
int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
{
int retval;
@ -233,7 +233,7 @@ EXPORT_SYMBOL(mdiobus_read);
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val)
int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
{
int err;

12
include/linux/phy.h
View File

@ -81,6 +81,10 @@ typedef enum {
*/
#define MII_BUS_ID_SIZE (20 - 3)
/* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips. */
#define MII_ADDR_C45 (1<<30)
/*
* The Bus class for PHYs. Devices which provide access to
* PHYs should register using this structure
@ -127,8 +131,8 @@ int mdiobus_register(struct mii_bus *bus);
void mdiobus_unregister(struct mii_bus *bus);
void mdiobus_free(struct mii_bus *bus);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum);
int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val);
int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
#define PHY_INTERRUPT_DISABLED 0x0
@ -422,7 +426,7 @@ struct phy_fixup {
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
static inline int phy_read(struct phy_device *phydev, u16 regnum)
static inline int phy_read(struct phy_device *phydev, u32 regnum)
{
return mdiobus_read(phydev->bus, phydev->addr, regnum);
}
@ -437,7 +441,7 @@ static inline int phy_read(struct phy_device *phydev, u16 regnum)
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
static inline int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
static inline int phy_write(struct phy_device *phydev, u32 regnum, u16 val)
{
return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
}