1/*
  2 * Driver for the Texas Instruments DP83848 PHY
  3 *
  4 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation; either version 2 of the License.
  9 *
 10 * This program is distributed in the hope that it will be useful,
 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 * GNU General Public License for more details.
 14 */
 15
 16#include <linux/module.h>
 17#include <linux/phy.h>
 18
 19#define TI_DP83848C_PHY_ID		0x20005ca0
 20#define NS_DP83848C_PHY_ID		0x20005c90
 21#define TLK10X_PHY_ID			0x2000a210
 22
 23/* Registers */
 24#define DP83848_MICR			0x11 /* MII Interrupt Control Register */
 25#define DP83848_MISR			0x12 /* MII Interrupt Status Register */
 26
 27/* MICR Register Fields */
 28#define DP83848_MICR_INT_OE		BIT(0) /* Interrupt Output Enable */
 29#define DP83848_MICR_INTEN		BIT(1) /* Interrupt Enable */
 30
 31/* MISR Register Fields */
 32#define DP83848_MISR_RHF_INT_EN		BIT(0) /* Receive Error Counter */
 33#define DP83848_MISR_FHF_INT_EN		BIT(1) /* False Carrier Counter */
 34#define DP83848_MISR_ANC_INT_EN		BIT(2) /* Auto-negotiation complete */
 35#define DP83848_MISR_DUP_INT_EN		BIT(3) /* Duplex Status */
 36#define DP83848_MISR_SPD_INT_EN		BIT(4) /* Speed status */
 37#define DP83848_MISR_LINK_INT_EN	BIT(5) /* Link status */
 38#define DP83848_MISR_ED_INT_EN		BIT(6) /* Energy detect */
 39#define DP83848_MISR_LQM_INT_EN		BIT(7) /* Link Quality Monitor */
 40
 41#define DP83848_INT_EN_MASK		\
 42	(DP83848_MISR_ANC_INT_EN |	\
 43	 DP83848_MISR_DUP_INT_EN |	\
 44	 DP83848_MISR_SPD_INT_EN |	\
 45	 DP83848_MISR_LINK_INT_EN)
 46
 47static int dp83848_ack_interrupt(struct phy_device *phydev)
 48{
 49	int err = phy_read(phydev, DP83848_MISR);
 50
 51	return err < 0 ? err : 0;
 52}
 53
 54static int dp83848_config_intr(struct phy_device *phydev)
 55{
 56	int control, ret;
 57
 58	control = phy_read(phydev, DP83848_MICR);
 59	if (control < 0)
 60		return control;
 61
 62	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
 63		control |= DP83848_MICR_INT_OE;
 64		control |= DP83848_MICR_INTEN;
 65
 66		ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
 67		if (ret < 0)
 68			return ret;
 69	} else {
 70		control &= ~DP83848_MICR_INTEN;
 71	}
 72
 73	return phy_write(phydev, DP83848_MICR, control);
 74}
 75
 76static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
 77	{ TI_DP83848C_PHY_ID, 0xfffffff0 },
 78	{ NS_DP83848C_PHY_ID, 0xfffffff0 },
 79	{ TLK10X_PHY_ID, 0xfffffff0 },
 80	{ }
 81};
 82MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
 83
 84#define DP83848_PHY_DRIVER(_id, _name)				\
 85	{							\
 86		.phy_id		= _id,				\
 87		.phy_id_mask	= 0xfffffff0,			\
 88		.name		= _name,			\
 89		.features	= PHY_BASIC_FEATURES,		\
 90		.flags		= PHY_HAS_INTERRUPT,		\
 91								\
 92		.soft_reset	= genphy_soft_reset,		\
 93		.config_init	= genphy_config_init,		\
 94		.suspend	= genphy_suspend,		\
 95		.resume		= genphy_resume,		\
 96		.config_aneg	= genphy_config_aneg,		\
 97		.read_status	= genphy_read_status,		\
 98								\
 99		/* IRQ related */				\
100		.ack_interrupt	= dp83848_ack_interrupt,	\
101		.config_intr	= dp83848_config_intr,		\
102	}
103
104static struct phy_driver dp83848_driver[] = {
105	DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY"),
106	DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY"),
107	DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY"),
108};
109module_phy_driver(dp83848_driver);
110
111MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
112MODULE_AUTHOR("Andrew F. Davis <afd@ti.com");
113MODULE_LICENSE("GPL");