drivers/net/ethernet/ti/netcp_sgmii.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/ti/netcp_sgmii.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/ti/netcp_sgmii.c
Extension
.c
Size
3507 bytes
Lines
151
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * SGMI module initialisation
 *
 * Copyright (C) 2014 Texas Instruments Incorporated
 * Authors:	Sandeep Nair <sandeep_n@ti.com>
 *		Sandeep Paulraj <s-paulraj@ti.com>
 *		Wingman Kwok <w-kwok2@ti.com>
 *
 */

#include "netcp.h"

#define SGMII_SRESET_RESET		BIT(0)
#define SGMII_SRESET_RTRESET		BIT(1)

#define SGMII_REG_STATUS_LOCK		BIT(4)
#define	SGMII_REG_STATUS_LINK		BIT(0)
#define SGMII_REG_STATUS_AUTONEG	BIT(2)
#define SGMII_REG_CONTROL_AUTONEG	BIT(0)

#define SGMII23_OFFSET(x)	((x - 2) * 0x100)
#define SGMII_OFFSET(x)		((x <= 1) ? (x * 0x100) : (SGMII23_OFFSET(x)))

/* SGMII registers */
#define SGMII_SRESET_REG(x)   (SGMII_OFFSET(x) + 0x004)
#define SGMII_CTL_REG(x)      (SGMII_OFFSET(x) + 0x010)
#define SGMII_STATUS_REG(x)   (SGMII_OFFSET(x) + 0x014)
#define SGMII_MRADV_REG(x)    (SGMII_OFFSET(x) + 0x018)

static void sgmii_write_reg(void __iomem *base, int reg, u32 val)
{
	writel(val, base + reg);
}

static u32 sgmii_read_reg(void __iomem *base, int reg)
{
	return readl(base + reg);
}

static void sgmii_write_reg_bit(void __iomem *base, int reg, u32 val)
{
	writel((readl(base + reg) | val), base + reg);
}

/* port is 0 based */
int netcp_sgmii_reset(void __iomem *sgmii_ofs, int port)
{
	/* Soft reset */
	sgmii_write_reg_bit(sgmii_ofs, SGMII_SRESET_REG(port),
			    SGMII_SRESET_RESET);

	while ((sgmii_read_reg(sgmii_ofs, SGMII_SRESET_REG(port)) &
		SGMII_SRESET_RESET) != 0x0)
		;

	return 0;
}

/* port is 0 based */
bool netcp_sgmii_rtreset(void __iomem *sgmii_ofs, int port, bool set)
{
	u32 reg;
	bool oldval;

	/* Initiate a soft reset */
	reg = sgmii_read_reg(sgmii_ofs, SGMII_SRESET_REG(port));
	oldval = (reg & SGMII_SRESET_RTRESET) != 0x0;
	if (set)
		reg |= SGMII_SRESET_RTRESET;
	else
		reg &= ~SGMII_SRESET_RTRESET;
	sgmii_write_reg(sgmii_ofs, SGMII_SRESET_REG(port), reg);
	wmb();

	return oldval;
}

int netcp_sgmii_get_port_link(void __iomem *sgmii_ofs, int port)
{
	u32 status = 0, link = 0;

	status = sgmii_read_reg(sgmii_ofs, SGMII_STATUS_REG(port));
	if ((status & SGMII_REG_STATUS_LINK) != 0)
		link = 1;
	return link;
}

int netcp_sgmii_config(void __iomem *sgmii_ofs, int port, u32 interface)
{

Annotation

Implementation Notes