drivers/net/mdio/mdio-cavium.c

Source file repositories/reference/linux-study-clean/drivers/net/mdio/mdio-cavium.c

File Facts

System
Linux kernel
Corpus path
drivers/net/mdio/mdio-cavium.c
Extension
.c
Size
4741 bytes
Lines
200
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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
/*
 * Copyright (C) 2009-2016 Cavium, Inc.
 */

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/phy.h>

#include "mdio-cavium.h"

static void cavium_mdiobus_set_mode(struct cavium_mdiobus *p,
				    enum cavium_mdiobus_mode m)
{
	union cvmx_smix_clk smi_clk;

	if (m == p->mode)
		return;

	smi_clk.u64 = oct_mdio_readq(p->register_base + SMI_CLK);
	smi_clk.s.mode = (m == C45) ? 1 : 0;
	smi_clk.s.preamble = 1;
	oct_mdio_writeq(smi_clk.u64, p->register_base + SMI_CLK);
	p->mode = m;
}

static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p,
				   int phy_id, int devad, int regnum)
{
	union cvmx_smix_cmd smi_cmd;
	union cvmx_smix_wr_dat smi_wr;
	int timeout = 1000;

	cavium_mdiobus_set_mode(p, C45);

	smi_wr.u64 = 0;
	smi_wr.s.dat = regnum & 0xffff;
	oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);

	smi_cmd.u64 = 0;
	smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_45_ADDRESS */
	smi_cmd.s.phy_adr = phy_id;
	smi_cmd.s.reg_adr = devad;
	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);

	do {
		/* Wait 1000 clocks so we don't saturate the RSL bus
		 * doing reads.
		 */
		__delay(1000);
		smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
	} while (smi_wr.s.pending && --timeout);

	if (timeout <= 0)
		return -EIO;
	return 0;
}

int cavium_mdiobus_read_c22(struct mii_bus *bus, int phy_id, int regnum)
{
	struct cavium_mdiobus *p = bus->priv;
	union cvmx_smix_cmd smi_cmd;
	union cvmx_smix_rd_dat smi_rd;
	int timeout = 1000;

	cavium_mdiobus_set_mode(p, C22);

	smi_cmd.u64 = 0;
	smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */
	smi_cmd.s.phy_adr = phy_id;
	smi_cmd.s.reg_adr = regnum;
	oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);

	do {
		/* Wait 1000 clocks so we don't saturate the RSL bus
		 * doing reads.
		 */
		__delay(1000);
		smi_rd.u64 = oct_mdio_readq(p->register_base + SMI_RD_DAT);
	} while (smi_rd.s.pending && --timeout);

	if (smi_rd.s.val)
		return smi_rd.s.dat;
	else
		return -EIO;
}
EXPORT_SYMBOL(cavium_mdiobus_read_c22);

int cavium_mdiobus_read_c45(struct mii_bus *bus, int phy_id, int devad,

Annotation

Implementation Notes