[mirror_ubuntu-hirsute-kernel.git] / drivers / net / phy / amd.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for AMD am79c PHYs
 *
 * Author: Heiko Schocher <hs@denx.de>
 *
 * Copyright (c) 2011 DENX Software Engineering GmbH
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/phy.h>

#define PHY_ID_AM79C874		0x0022561b

#define MII_AM79C_IR		17	/* Interrupt Status/Control Register */
#define MII_AM79C_IR_EN_LINK	0x0400	/* IR enable Linkstate */
#define MII_AM79C_IR_EN_ANEG	0x0100	/* IR enable Aneg Complete */
#define MII_AM79C_IR_IMASK_INIT	(MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)

#define MII_AM79C_IR_LINK_DOWN	BIT(2)
#define MII_AM79C_IR_ANEG_DONE	BIT(0)
#define MII_AM79C_IR_IMASK_STAT	(MII_AM79C_IR_LINK_DOWN | MII_AM79C_IR_ANEG_DONE)

MODULE_DESCRIPTION("AMD PHY driver");
MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
MODULE_LICENSE("GPL");

static int am79c_ack_interrupt(struct phy_device *phydev)
{
	int err;

	err = phy_read(phydev, MII_BMSR);
	if (err < 0)
		return err;

	err = phy_read(phydev, MII_AM79C_IR);
	if (err < 0)
		return err;

	return 0;
}

static int am79c_config_init(struct phy_device *phydev)
{
	return 0;
}

static int am79c_config_intr(struct phy_device *phydev)
{
	int err;

	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
		err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
	else
		err = phy_write(phydev, MII_AM79C_IR, 0);

	return err;
}

static irqreturn_t am79c_handle_interrupt(struct phy_device *phydev)
{
	int irq_status;

	irq_status = phy_read(phydev, MII_AM79C_IR);
	if (irq_status < 0) {
		phy_error(phydev);
		return IRQ_NONE;
	}

	if (!(irq_status & MII_AM79C_IR_IMASK_STAT))
		return IRQ_NONE;

	phy_trigger_machine(phydev);

	return IRQ_HANDLED;
}

static struct phy_driver am79c_driver[] = { {
	.phy_id		= PHY_ID_AM79C874,
	.name		= "AM79C874",
	.phy_id_mask	= 0xfffffff0,
	/* PHY_BASIC_FEATURES */
	.config_init	= am79c_config_init,
	.ack_interrupt	= am79c_ack_interrupt,
	.config_intr	= am79c_config_intr,
	.handle_interrupt = am79c_handle_interrupt,
} };

module_phy_driver(am79c_driver);

static struct mdio_device_id __maybe_unused amd_tbl[] = {
	{ PHY_ID_AM79C874, 0xfffffff0 },
	{ }
};

MODULE_DEVICE_TABLE(mdio, amd_tbl);
Commit	Line	Data
a2443fd1	1	// SPDX-License-Identifier: GPL-2.0+
49099122 HS	2	/*
	3	* Driver for AMD am79c PHYs
	4	*
	5	* Author: Heiko Schocher <hs@denx.de>
	6	*
	7	* Copyright (c) 2011 DENX Software Engineering GmbH
49099122 HS	8	*/
	9	#include <linux/kernel.h>
	10	#include <linux/errno.h>
	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/mii.h>
	14	#include <linux/phy.h>
	15
	16	#define PHY_ID_AM79C874 0x0022561b
	17
	18	#define MII_AM79C_IR 17 /* Interrupt Status/Control Register */
	19	#define MII_AM79C_IR_EN_LINK 0x0400 /* IR enable Linkstate */
	20	#define MII_AM79C_IR_EN_ANEG 0x0100 /* IR enable Aneg Complete */
	21	#define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK \| MII_AM79C_IR_EN_ANEG)
	22
d995a36b IC	23	#define MII_AM79C_IR_LINK_DOWN BIT(2)
	24	#define MII_AM79C_IR_ANEG_DONE BIT(0)
	25	#define MII_AM79C_IR_IMASK_STAT (MII_AM79C_IR_LINK_DOWN \| MII_AM79C_IR_ANEG_DONE)
	26
49099122 HS	27	MODULE_DESCRIPTION("AMD PHY driver");
	28	MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
	29	MODULE_LICENSE("GPL");
	30
	31	static int am79c_ack_interrupt(struct phy_device *phydev)
	32	{
	33	int err;
	34
	35	err = phy_read(phydev, MII_BMSR);
	36	if (err < 0)
	37	return err;
	38
	39	err = phy_read(phydev, MII_AM79C_IR);
	40	if (err < 0)
	41	return err;
	42
	43	return 0;
	44	}
	45
	46	static int am79c_config_init(struct phy_device *phydev)
	47	{
	48	return 0;
	49	}
	50
	51	static int am79c_config_intr(struct phy_device *phydev)
	52	{
	53	int err;
	54
	55	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
	56	err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
	57	else
	58	err = phy_write(phydev, MII_AM79C_IR, 0);
	59
	60	return err;
	61	}
	62
d995a36b IC	63	static irqreturn_t am79c_handle_interrupt(struct phy_device *phydev)
	64	{
	65	int irq_status;
	66
	67	irq_status = phy_read(phydev, MII_AM79C_IR);
	68	if (irq_status < 0) {
	69	phy_error(phydev);
	70	return IRQ_NONE;
	71	}
	72
	73	if (!(irq_status & MII_AM79C_IR_IMASK_STAT))
	74	return IRQ_NONE;
	75
	76	phy_trigger_machine(phydev);
	77
	78	return IRQ_HANDLED;
	79	}
	80
116dffa0	81	static struct phy_driver am79c_driver[] = { {
49099122 HS	82	.phy_id = PHY_ID_AM79C874,
	83	.name = "AM79C874",
	84	.phy_id_mask = 0xfffffff0,
dcdecdcf	85	/* PHY_BASIC_FEATURES */
49099122	86	.config_init = am79c_config_init,
49099122 HS	87	.ack_interrupt = am79c_ack_interrupt,
49099122 HS	88	.config_intr = am79c_config_intr,
d995a36b	89	.handle_interrupt = am79c_handle_interrupt,
116dffa0	90	} };
49099122	91
116dffa0	92	module_phy_driver(am79c_driver);
49099122 HS	93
	94	static struct mdio_device_id __maybe_unused amd_tbl[] = {
	95	{ PHY_ID_AM79C874, 0xfffffff0 },
	96	{ }
	97	};
	98
	99	MODULE_DEVICE_TABLE(mdio, amd_tbl);