dsa: Replace mii_bus with a generic host device

This change makes it so that instead of passing and storing a mii_bus we
instead pass and store a host_dev.  From there we can test to determine the
exact type of device, and can verify it is the correct device for our switch.

So for example it would be possible to pass a device pointer from a pci_dev
and instead of checking for a PHY ID we could check for a vendor and/or device
ID.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/arm/plat-orion/common.c

@@ -499,7 +499,7 @@ void __init orion_ge00_switch_init(struct dsa_platform_data *d, int irq)
 
 	d->netdev = &orion_ge00.dev;
 	for (i = 0; i < d->nr_chips; i++)
-		d->chip[i].mii_bus = &orion_ge00_shared.dev;
+		d->chip[i].host_dev = &orion_ge00_shared.dev;
 	orion_switch_device.dev.platform_data = d;
 
 	platform_device_register(&orion_switch_device);

drivers/net/dsa/bcm_sf2.c

@@ -129,7 +129,7 @@ static int bcm_sf2_sw_get_sset_count(struct dsa_switch *ds)
 	return BCM_SF2_STATS_SIZE;
 }
 
-static char *bcm_sf2_sw_probe(struct mii_bus *bus, int sw_addr)
+static char *bcm_sf2_sw_probe(struct device *host_dev, int sw_addr)
 {
 	return "Broadcom Starfighter 2";
 }

drivers/net/dsa/mv88e6060.c

@@ -21,7 +21,8 @@
 
 static int reg_read(struct dsa_switch *ds, int addr, int reg)
 {
-	return mdiobus_read(ds->master_mii_bus, ds->pd->sw_addr + addr, reg);
+	return mdiobus_read(to_mii_bus(ds->master_dev),
+			    ds->pd->sw_addr + addr, reg);
 }
 
 #define REG_READ(addr, reg)					\
@@ -37,8 +38,8 @@ static int reg_read(struct dsa_switch *ds, int addr, int reg)
 
 static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
 {
-	return mdiobus_write(ds->master_mii_bus, ds->pd->sw_addr + addr,
-			     reg, val);
+	return mdiobus_write(to_mii_bus(ds->master_dev),
+			     ds->pd->sw_addr + addr, reg, val);
 }
 
 #define REG_WRITE(addr, reg, val)				\
@@ -50,10 +51,14 @@ static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
 			return __ret;				\
 	})
 
-static char *mv88e6060_probe(struct mii_bus *bus, int sw_addr)
+static char *mv88e6060_probe(struct device *host_dev, int sw_addr)
 {
+	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
 	int ret;
 
+	if (bus == NULL)
+		return NULL;
+
 	ret = mdiobus_read(bus, sw_addr + REG_PORT(0), 0x03);
 	if (ret >= 0) {
 		ret &= 0xfff0;

drivers/net/dsa/mv88e6123_61_65.c

@@ -17,10 +17,14 @@
 #include <net/dsa.h>
 #include "mv88e6xxx.h"
 
-static char *mv88e6123_61_65_probe(struct mii_bus *bus, int sw_addr)
+static char *mv88e6123_61_65_probe(struct device *host_dev, int sw_addr)
 {
+	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
 	int ret;
 
+	if (bus == NULL)
+		return NULL;
+
 	ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), 0x03);
 	if (ret >= 0) {
 		if (ret == 0x1212)

drivers/net/dsa/mv88e6131.c

@@ -22,10 +22,14 @@
 #define ID_6095		0x0950
 #define ID_6131		0x1060
 
-static char *mv88e6131_probe(struct mii_bus *bus, int sw_addr)
+static char *mv88e6131_probe(struct device *host_dev, int sw_addr)
 {
+	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
 	int ret;
 
+	if (bus == NULL)
+		return NULL;
+
 	ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), 0x03);
 	if (ret >= 0) {
 		ret &= 0xfff0;

drivers/net/dsa/mv88e6171.c

@@ -17,10 +17,14 @@
 #include <net/dsa.h>
 #include "mv88e6xxx.h"
 
-static char *mv88e6171_probe(struct mii_bus *bus, int sw_addr)
+static char *mv88e6171_probe(struct device *host_dev, int sw_addr)
 {
+	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
 	int ret;
 
+	if (bus == NULL)
+		return NULL;
+
 	ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), 0x03);
 	if (ret >= 0) {
 		if ((ret & 0xfff0) == 0x1710)

drivers/net/dsa/mv88e6xxx.c

@@ -78,7 +78,7 @@ int mv88e6xxx_reg_read(struct dsa_switch *ds, int addr, int reg)
 	int ret;
 
 	mutex_lock(&ps->smi_mutex);
-	ret = __mv88e6xxx_reg_read(ds->master_mii_bus,
+	ret = __mv88e6xxx_reg_read(to_mii_bus(ds->master_dev),
 				   ds->pd->sw_addr, addr, reg);
 	mutex_unlock(&ps->smi_mutex);
 
@@ -122,7 +122,7 @@ int mv88e6xxx_reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
 	int ret;
 
 	mutex_lock(&ps->smi_mutex);
-	ret = __mv88e6xxx_reg_write(ds->master_mii_bus,
+	ret = __mv88e6xxx_reg_write(to_mii_bus(ds->master_dev),
 				    ds->pd->sw_addr, addr, reg, val);
 	mutex_unlock(&ps->smi_mutex);
 

include/net/dsa.h

@@ -34,7 +34,7 @@ struct dsa_chip_data {
 	/*
 	 * How to access the switch configuration registers.
 	 */
-	struct device	*mii_bus;
+	struct device	*host_dev;
 	int		sw_addr;
 
 	/* Device tree node pointer for this specific switch chip
@@ -134,9 +134,9 @@ struct dsa_switch {
 	struct dsa_switch_driver	*drv;
 
 	/*
-	 * Reference to mii bus to use.
+	 * Reference to host device to use.
 	 */
-	struct mii_bus		*master_mii_bus;
+	struct device		*master_dev;
 
 	/*
 	 * Slave mii_bus and devices for the individual ports.
@@ -178,7 +178,7 @@ struct dsa_switch_driver {
 	/*
 	 * Probing and setup.
 	 */
-	char	*(*probe)(struct mii_bus *bus, int sw_addr);
+	char	*(*probe)(struct device *host_dev, int sw_addr);
 	int	(*setup)(struct dsa_switch *ds);
 	int	(*set_addr)(struct dsa_switch *ds, u8 *addr);
 
@@ -213,6 +213,7 @@ struct dsa_switch_driver {
 
 void register_switch_driver(struct dsa_switch_driver *type);
 void unregister_switch_driver(struct dsa_switch_driver *type);
+struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
 
 static inline void *ds_to_priv(struct dsa_switch *ds)
 {

net/dsa/dsa.c

@@ -43,7 +43,7 @@ void unregister_switch_driver(struct dsa_switch_driver *drv)
 EXPORT_SYMBOL_GPL(unregister_switch_driver);
 
 static struct dsa_switch_driver *
-dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
+dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
 {
 	struct dsa_switch_driver *ret;
 	struct list_head *list;
@@ -58,7 +58,7 @@ dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
 
 		drv = list_entry(list, struct dsa_switch_driver, list);
 
-		name = drv->probe(bus, sw_addr);
+		name = drv->probe(host_dev, sw_addr);
 		if (name != NULL) {
 			ret = drv;
 			break;
@@ -75,7 +75,7 @@ dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
 /* basic switch operations **************************************************/
 static struct dsa_switch *
 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
-		 struct device *parent, struct mii_bus *bus)
+		 struct device *parent, struct device *host_dev)
 {
 	struct dsa_chip_data *pd = dst->pd->chip + index;
 	struct dsa_switch_driver *drv;
@@ -88,7 +88,7 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 	/*
 	 * Probe for switch model.
 	 */
-	drv = dsa_switch_probe(bus, pd->sw_addr, &name);
+	drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
 	if (drv == NULL) {
 		printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
 		       dst->master_netdev->name, index);
@@ -109,8 +109,7 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 	ds->index = index;
 	ds->pd = dst->pd->chip + index;
 	ds->drv = drv;
-	ds->master_mii_bus = bus;
-
+	ds->master_dev = host_dev;
 
 	/*
 	 * Validate supplied switch configuration.
@@ -285,7 +284,7 @@ static struct device *dev_find_class(struct device *parent, char *class)
 	return device_find_child(parent, class, dev_is_class);
 }
 
-static struct mii_bus *dev_to_mii_bus(struct device *dev)
+struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 {
 	struct device *d;
 
@@ -301,6 +300,7 @@ static struct mii_bus *dev_to_mii_bus(struct device *dev)
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 
 static struct net_device *dev_to_net_device(struct device *dev)
 {
@@ -566,17 +566,9 @@ static int dsa_probe(struct platform_device *pdev)
 	dst->cpu_port = -1;
 
 	for (i = 0; i < pd->nr_chips; i++) {
-		struct mii_bus *bus;
 		struct dsa_switch *ds;
 
-		bus = dev_to_mii_bus(pd->chip[i].mii_bus);
-		if (bus == NULL) {
-			printk(KERN_ERR "%s[%d]: no mii bus found for "
-				"dsa switch\n", dev->name, i);
-			continue;
-		}
-
-		ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
+		ds = dsa_switch_setup(dst, i, &pdev->dev, pd->chip[i].host_dev);
 		if (IS_ERR(ds)) {
 			printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
 				"instance (error %ld)\n", dev->name, i,

net/dsa/slave.c

@@ -44,7 +44,7 @@ void dsa_slave_mii_bus_init(struct dsa_switch *ds)
 	ds->slave_mii_bus->write = dsa_slave_phy_write;
 	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
 			ds->index, ds->pd->sw_addr);
-	ds->slave_mii_bus->parent = &ds->master_mii_bus->dev;
+	ds->slave_mii_bus->parent = ds->master_dev;
 }