netdev - [PATCH v2 9/9] b44: use fixed PHY device if we do not find any

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Date:	Thu, 19 Dec 2013 02:28:46 +0100
From:	Hauke Mehrtens <hauke@...ke-m.de>
To:	davem@...emloft.net
Cc:	zambrano@...adcom.com, netdev@...r.kernel.org,
	f.fainelli@...il.com, Hauke Mehrtens <hauke@...ke-m.de>
Subject: [PATCH v2 9/9] b44: use fixed PHY device if we do not find any

The ADM6996L switch and some Broadcom switches with two MII interfaces
like the BCM5325F connected to two MACs on the SoC, used on some
routers do not return a valid value when reading the PHY id register
and Linux thinks there is no PHY at all, but that is wrong.
This patch registers a fixed phy in such a case and make b44 use that
instead.

Signed-off-by: Hauke Mehrtens <hauke@...ke-m.de>
---
 drivers/net/ethernet/broadcom/b44.c |   42 ++++++++++++++++++++++++++++++++++-
 drivers/net/ethernet/broadcom/b44.h |    3 +++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/b44.c b/drivers/net/ethernet/broadcom/b44.c
index 839dd90..ea540cd 100644
--- a/drivers/net/ethernet/broadcom/b44.c
+++ b/drivers/net/ethernet/broadcom/b44.c
@@ -31,6 +31,7 @@
 #include <linux/ssb/ssb.h>
 #include <linux/slab.h>
 #include <linux/phy.h>
+#include <linux/phy_fixed.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -2233,6 +2234,11 @@ static int b44_register_phy_one(struct b44 *bp)
 	struct ssb_device *sdev = bp->sdev;
 	struct phy_device *phydev;
 	char bus_id[MII_BUS_ID_SIZE + 3];
+	struct ssb_sprom *sprom = &sdev->bus->sprom;
+	struct platform_device *pdev;
+	struct pdata_fixed_phy *pdata;
+	size_t pdata_size = sizeof(struct pdata_fixed_phy) +
+			    1 * sizeof(struct fixed_phy_conf);
 	int err;
 
 	mii_bus = mdiobus_alloc();
@@ -2266,7 +2272,41 @@ static int b44_register_phy_one(struct b44 *bp)
 		goto err_out_mdiobus_irq;
 	}
 
-	snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, mii_bus->id, bp->phy_addr);
+	if (!bp->mii_bus->phy_map[bp->phy_addr] &&
+	    (sprom->boardflags_lo & (B44_BOARDFLAG_ROBO | B44_BOARDFLAG_ADM))) {
+
+		dev_info(sdev->dev,
+			 "could not find PHY at %i, create fixed one\n",
+			 bp->phy_addr);
+
+		pdata = kzalloc(pdata_size, GFP_KERNEL);
+		if (!pdata) {
+			dev_err(sdev->dev, "fixed phy allocation failed\n");
+			err = -ENOMEM;
+			goto err_out_mdiobus_unregister;
+		}
+		pdata->phys_num = 1;
+		pdata->name = "fixed-0";
+		pdata->phys[0].phy_id = bp->phy_addr;
+		pdata->phys[0].status.duplex = DUPLEX_FULL;
+		pdata->phys[0].status.speed = SPEED_100;
+		pdata->phys[0].status.link = 1;
+		
+		pdev = platform_device_register_data(bp->sdev->dev, "fixed-phy", 0,
+						     pdata, pdata_size);
+		kfree(pdata);
+		if (IS_ERR(pdev)) {
+			err = PTR_ERR(pdev);
+			dev_err(sdev->dev,
+			        "fixed phy registration failed with %i\n", err);
+			goto err_out_mdiobus_unregister;
+		}
+		snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, "fixed-0",
+			 bp->phy_addr);
+	} else {
+		snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, mii_bus->id,
+			 bp->phy_addr);
+	}
 
 	phydev = phy_connect(bp->dev, bus_id, &b44_adjust_link,
 			     PHY_INTERFACE_MODE_MII);
diff --git a/drivers/net/ethernet/broadcom/b44.h b/drivers/net/ethernet/broadcom/b44.h
index de81639..3e9c3fc 100644
--- a/drivers/net/ethernet/broadcom/b44.h
+++ b/drivers/net/ethernet/broadcom/b44.h
@@ -345,6 +345,9 @@ B44_STAT_REG_DECLARE
 	struct u64_stats_sync	syncp;
 };
 
+#define	B44_BOARDFLAG_ROBO		0x0010  /* Board has robo switch */
+#define	B44_BOARDFLAG_ADM		0x0080  /* Board has ADMtek switch */
+
 struct ssb_device;
 
 struct b44 {
-- 
1.7.10.4

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