1// SPDX-License-Identifier: GPL-2.0
 2// Copyright (C) 2018 Microchip Technology
 3
 4#include <linux/kernel.h>
 5#include <linux/module.h>
 6#include <linux/mii.h>
 7#include <linux/phy.h>
 8
 9/* Interrupt Source Register */
10#define LAN87XX_INTERRUPT_SOURCE                (0x18)
11
12/* Interrupt Mask Register */
13#define LAN87XX_INTERRUPT_MASK                  (0x19)
14#define LAN87XX_MASK_LINK_UP                    (0x0004)
15#define LAN87XX_MASK_LINK_DOWN                  (0x0002)
16
17#define DRIVER_AUTHOR	"Nisar Sayed <nisar.sayed@microchip.com>"
18#define DRIVER_DESC	"Microchip LAN87XX T1 PHY driver"
19
20static int lan87xx_phy_config_intr(struct phy_device *phydev)
21{
22	int rc, val = 0;
23
24	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
25		/* unmask all source and clear them before enable */
26		rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, 0x7FFF);
27		rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
28		val = LAN87XX_MASK_LINK_UP | LAN87XX_MASK_LINK_DOWN;
29	}
30
31	rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, val);
32
33	return rc < 0 ? rc : 0;
34}
35
36static int lan87xx_phy_ack_interrupt(struct phy_device *phydev)
37{
38	int rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
39
40	return rc < 0 ? rc : 0;
41}
42
43static struct phy_driver microchip_t1_phy_driver[] = {
44	{
45		.phy_id         = 0x0007c150,
46		.phy_id_mask    = 0xfffffff0,
47		.name           = "Microchip LAN87xx T1",
48
49		.features       = PHY_BASIC_T1_FEATURES,
50
51		.config_aneg    = genphy_config_aneg,
52
53		.ack_interrupt  = lan87xx_phy_ack_interrupt,
54		.config_intr    = lan87xx_phy_config_intr,
55
56		.suspend        = genphy_suspend,
57		.resume         = genphy_resume,
58	}
59};
60
61module_phy_driver(microchip_t1_phy_driver);
62
63static struct mdio_device_id __maybe_unused microchip_t1_tbl[] = {
64	{ 0x0007c150, 0xfffffff0 },
65	{ }
66};
67
68MODULE_DEVICE_TABLE(mdio, microchip_t1_tbl);
69
70MODULE_AUTHOR(DRIVER_AUTHOR);
71MODULE_DESCRIPTION(DRIVER_DESC);
72MODULE_LICENSE("GPL");