1 // SPDX-License-Identifier: GPL-2.0
6  * Copyright (c) 2007 Freescale Semiconductor
10  * Copyright (c) 2003 Intracom S.A.
13  * 2005 (c) MontaVista Software, Inc.
18 #include <linux/mdio-bitbang.h>
46 	const struct mdiobb_ops *ops = ctrl->ops;  in mdiobb_send_bit()
48 	ops->set_mdio_data(ctrl, val);  in mdiobb_send_bit()
50 	ops->set_mdc(ctrl, 1);  in mdiobb_send_bit()
52 	ops->set_mdc(ctrl, 0);  in mdiobb_send_bit()
58 	const struct mdiobb_ops *ops = ctrl->ops;  in mdiobb_get_bit()
61 	ops->set_mdc(ctrl, 1);  in mdiobb_get_bit()
63 	ops->set_mdc(ctrl, 0);  in mdiobb_get_bit()
65 	return ops->get_mdio_data(ctrl);  in mdiobb_get_bit()
73 	for (i = bits - 1; i >= 0; i--)  in mdiobb_send_num()
83 	for (i = bits - 1; i >= 0; i--) {  in mdiobb_get_num()
96 	const struct mdiobb_ops *ops = ctrl->ops;  in mdiobb_cmd()
99 	ops->set_mdio_dir(ctrl, 1);  in mdiobb_cmd()
114 	   Clause 45 operation uses 00 for the start and 11, 10 for  in mdiobb_cmd()
128 /* In clause 45 mode all commands are prefixed by MDIO_ADDR to specify the
130    MDIO_WRITE except for a different code. To enable clause 45 mode or
131    MII_ADDR_C45 into the address. Theoretically clause 45 and normal devices
146 	ctrl->ops->set_mdio_dir(ctrl, 0);  in mdiobb_cmd_addr()
154 	struct mdiobb_ctrl *ctrl = bus->priv;  in mdiobb_read()
161 		mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg);  in mdiobb_read()
163 	ctrl->ops->set_mdio_dir(ctrl, 0);  in mdiobb_read()
169 	    !(bus->phy_ignore_ta_mask & (1 << phy))) {  in mdiobb_read()
170 		/* PHY didn't drive TA low -- flush any bits it  in mdiobb_read()
187 	struct mdiobb_ctrl *ctrl = bus->priv;  in mdiobb_write()
193 		mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg);  in mdiobb_write()
201 	ctrl->ops->set_mdio_dir(ctrl, 0);  in mdiobb_write()
215 	__module_get(ctrl->ops->owner);  in alloc_mdio_bitbang()
217 	bus->read = mdiobb_read;  in alloc_mdio_bitbang()
218 	bus->write = mdiobb_write;  in alloc_mdio_bitbang()
219 	bus->priv = ctrl;  in alloc_mdio_bitbang()
220 	if (!ctrl->override_op_c22) {  in alloc_mdio_bitbang()
221 		ctrl->op_c22_read = MDIO_READ;  in alloc_mdio_bitbang()
222 		ctrl->op_c22_write = MDIO_WRITE;  in alloc_mdio_bitbang()
231 	struct mdiobb_ctrl *ctrl = bus->priv;  in free_mdio_bitbang()
233 	module_put(ctrl->ops->owner);  in free_mdio_bitbang()