drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/broadcom/bgmac-bcma-mdio.c
Extension
.c
Size
7554 bytes
Lines
265
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

#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt

#include <linux/bcma/bcma.h>
#include <linux/brcmphy.h>
#include <linux/of_mdio.h>
#include "bgmac.h"

static bool bcma_mdio_wait_value(struct bcma_device *core, u16 reg, u32 mask,
				 u32 value, int timeout)
{
	u32 val;
	int i;

	for (i = 0; i < timeout / 10; i++) {
		val = bcma_read32(core, reg);
		if ((val & mask) == value)
			return true;
		udelay(10);
	}
	dev_err(&core->dev, "Timeout waiting for reg 0x%X\n", reg);
	return false;
}

/**************************************************
 * PHY ops
 **************************************************/

static u16 bcma_mdio_phy_read(struct bgmac *bgmac, u8 phyaddr, u8 reg)
{
	struct bcma_device *core;
	u16 phy_access_addr;
	u16 phy_ctl_addr;
	u32 tmp;

	BUILD_BUG_ON(BGMAC_PA_DATA_MASK != BCMA_GMAC_CMN_PA_DATA_MASK);
	BUILD_BUG_ON(BGMAC_PA_ADDR_MASK != BCMA_GMAC_CMN_PA_ADDR_MASK);
	BUILD_BUG_ON(BGMAC_PA_ADDR_SHIFT != BCMA_GMAC_CMN_PA_ADDR_SHIFT);
	BUILD_BUG_ON(BGMAC_PA_REG_MASK != BCMA_GMAC_CMN_PA_REG_MASK);
	BUILD_BUG_ON(BGMAC_PA_REG_SHIFT != BCMA_GMAC_CMN_PA_REG_SHIFT);
	BUILD_BUG_ON(BGMAC_PA_WRITE != BCMA_GMAC_CMN_PA_WRITE);
	BUILD_BUG_ON(BGMAC_PA_START != BCMA_GMAC_CMN_PA_START);
	BUILD_BUG_ON(BGMAC_PC_EPA_MASK != BCMA_GMAC_CMN_PC_EPA_MASK);
	BUILD_BUG_ON(BGMAC_PC_MCT_MASK != BCMA_GMAC_CMN_PC_MCT_MASK);
	BUILD_BUG_ON(BGMAC_PC_MCT_SHIFT != BCMA_GMAC_CMN_PC_MCT_SHIFT);
	BUILD_BUG_ON(BGMAC_PC_MTE != BCMA_GMAC_CMN_PC_MTE);

	if (bgmac->bcma.core->id.id == BCMA_CORE_4706_MAC_GBIT) {
		core = bgmac->bcma.core->bus->drv_gmac_cmn.core;
		phy_access_addr = BCMA_GMAC_CMN_PHY_ACCESS;
		phy_ctl_addr = BCMA_GMAC_CMN_PHY_CTL;
	} else {
		core = bgmac->bcma.core;
		phy_access_addr = BGMAC_PHY_ACCESS;
		phy_ctl_addr = BGMAC_PHY_CNTL;
	}

	tmp = bcma_read32(core, phy_ctl_addr);
	tmp &= ~BGMAC_PC_EPA_MASK;
	tmp |= phyaddr;
	bcma_write32(core, phy_ctl_addr, tmp);

	tmp = BGMAC_PA_START;
	tmp |= phyaddr << BGMAC_PA_ADDR_SHIFT;
	tmp |= reg << BGMAC_PA_REG_SHIFT;
	bcma_write32(core, phy_access_addr, tmp);

	if (!bcma_mdio_wait_value(core, phy_access_addr, BGMAC_PA_START, 0,
				  1000)) {
		dev_err(&core->dev, "Reading PHY %d register 0x%X failed\n",
			phyaddr, reg);
		return 0xffff;
	}

	return bcma_read32(core, phy_access_addr) & BGMAC_PA_DATA_MASK;
}

/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipphywr */
static int bcma_mdio_phy_write(struct bgmac *bgmac, u8 phyaddr, u8 reg,
			       u16 value)
{
	struct bcma_device *core;
	u16 phy_access_addr;
	u16 phy_ctl_addr;
	u32 tmp;

	if (bgmac->bcma.core->id.id == BCMA_CORE_4706_MAC_GBIT) {
		core = bgmac->bcma.core->bus->drv_gmac_cmn.core;
		phy_access_addr = BCMA_GMAC_CMN_PHY_ACCESS;
		phy_ctl_addr = BCMA_GMAC_CMN_PHY_CTL;
	} else {

Annotation

Implementation Notes