drivers/net/ethernet/ibm/emac/zmii.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/ibm/emac/zmii.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/ibm/emac/zmii.c
Extension
.c
Size
7059 bytes
Lines
298
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

if (*mode == PHY_INTERFACE_MODE_NA) {
			u32 r = dev->fer_save;

			ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);

			if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
				dev->mode = PHY_INTERFACE_MODE_MII;
			else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
				dev->mode = PHY_INTERFACE_MODE_RMII;
			else
				dev->mode = PHY_INTERFACE_MODE_SMII;
		} else {
			dev->mode = *mode;
		}
		printk(KERN_NOTICE "%pOF: bridge in %s mode\n",
		       ofdev->dev.of_node,
		       zmii_mode_name(dev->mode));
	} else {
		/* All inputs must use the same mode */
		if (*mode != PHY_INTERFACE_MODE_NA && *mode != dev->mode) {
			printk(KERN_ERR
			       "%pOF: invalid mode %d specified for input %d\n",
			       ofdev->dev.of_node, *mode, input);
			mutex_unlock(&dev->lock);
			return -EINVAL;
		}
	}

	/* Report back correct PHY mode,
	 * it may be used during PHY initialization.
	 */
	*mode = dev->mode;

	/* Enable this input */
	out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
	++dev->users;

	mutex_unlock(&dev->lock);

	return 0;
}

void zmii_get_mdio(struct platform_device *ofdev, int input)
{
	struct zmii_instance *dev = platform_get_drvdata(ofdev);
	u32 fer;

	ZMII_DBG2(dev, "get_mdio(%d)" NL, input);

	mutex_lock(&dev->lock);

	fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
	out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
}

void zmii_put_mdio(struct platform_device *ofdev, int input)
{
	struct zmii_instance *dev = platform_get_drvdata(ofdev);

	ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
	mutex_unlock(&dev->lock);
}


void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
{
	struct zmii_instance *dev = platform_get_drvdata(ofdev);
	u32 ssr;

	mutex_lock(&dev->lock);

	ssr = in_be32(&dev->base->ssr);

	ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);

	if (speed == SPEED_100)
		ssr |= ZMII_SSR_SP(input);
	else
		ssr &= ~ZMII_SSR_SP(input);

	out_be32(&dev->base->ssr, ssr);

	mutex_unlock(&dev->lock);
}

void zmii_detach(struct platform_device *ofdev, int input)
{
	struct zmii_instance *dev = platform_get_drvdata(ofdev);

	BUG_ON(!dev || dev->users == 0);

Annotation

Implementation Notes