static int mdiobb_read(struct mii_bus *bus, int phy, int reg)
{
struct mdiobb_ctrl *ctrl = bus->priv;
int ret, i;
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 */
if (mdiobb_get_bit(ctrl) != 0) {
/* PHY didn't drive TA low -- flush any bits it
* may be trying to send.
*/
for (i = 0; i < 32; i++)
mdiobb_get_bit(ctrl);
return 0xffff;
}
ret = mdiobb_get_num(ctrl, 16);
mdiobb_get_bit(ctrl);
return ret;
}
/* MDIO must already be configured as input. */
static u16 mdiobb_get_num(struct mdiobb_ctrl *ctrl, int bits)
{
int i;
u16 ret = 0;
for (i = bits - 1; i >= 0; i--) {
ret <<= 1;
ret |= mdiobb_get_bit(ctrl);
}
return ret;
}
/* MDIO must already be configured as input. */
static u16 mdiobb_get_num(int bits)
{
int i;
u16 ret = 0;
for (i = bits - 1; i >= 0; i--) {
ret <<= 1;
ret |= mdiobb_get_bit();
}
return ret;
}
u32 mdiobb_read(int phy_base, int phy, int reg)
{
u32 ret;
/*
* Get Right Phy Address
*/
phy = phy + phy_base;
mdiobb_cmd(MDIO_READ, phy, reg);
gpio_direction_input(MDIO);
mdiobb_get_bit();
/* check the turnaround bit: the PHY should be driving it to zero */
if (mdiobb_get_bit() != 0) {
//printk(KERN_WARNING "MDIO BAD READ FFFF from PHY(0x%x)/REG(0x%x)\n", phy, reg);
}
ret = mdiobb_get_num(16);
return ret;
}
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);
/* send the turnaround (10) */
mdiobb_send_bit(ctrl, 1);
mdiobb_send_bit(ctrl, 0);
mdiobb_send_num(ctrl, val, 16);
ctrl->ops->set_mdio_dir(ctrl, 0);
mdiobb_get_bit(ctrl);
return 0;
}
/* 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;
}
