[kernel] add switch driver for Lantiq PSB6970

Tested on ifxmips based board. The PSB6970 is also known as the Infineon Tantos switch.

Signed-off-by: Ithamar R. Adema <ithamar.adema@team-embedded.nl>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22914 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 438 insertions, 0 deletions

diff --git a/target/linux/generic/files/drivers/net/phy/psb6970.c b/target/linux/generic/files/drivers/net/phy/psb6970.c
new file mode 100644
index 000000000..b9280540c
--- /dev/null
+++ b/target/linux/generic/files/drivers/net/phy/psb6970.c
@@ -0,0 +1,438 @@
+/*
+ * Lantiq PSB6970 (Tantos) Switch driver
+ *
+ * Copyright (c) 2009,2010 Team Embedded.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of the GNU General Public License v2 as published by the
+ * Free Software Foundation.
+ *
+ * The switch programming done in this driver follows the 
+ * "Ethernet Traffic Separation using VLAN" Application Note as
+ * published by Lantiq.
+ */
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/switch.h>
+#include <linux/phy.h>
+
+#define PSB6970_MAX_VLANS		16
+#define PSB6970_NUM_PORTS		7
+#define PSB6970_DEFAULT_PORT_CPU	6
+#define PSB6970_IS_CPU_PORT(x)		((x) > 4)
+
+#define PHYADDR(_reg)		((_reg >> 5) & 0xff), (_reg & 0x1f)
+
+/* --- Identification --- */
+#define PSB6970_CI0		0x0100
+#define PSB6970_CI0_MASK	0x000f
+#define PSB6970_CI1		0x0101
+#define PSB6970_CI1_VAL		0x2599
+#define PSB6970_CI1_MASK	0xffff
+
+/* --- VLAN filter table --- */
+#define PSB6970_VFxL(i)		((i)*2+0x10)	/* VLAN Filter Low */
+#define PSB6970_VFxL_VV		(1 << 15)	/* VLAN_Valid */
+
+#define PSB6970_VFxH(i)		((i)*2+0x11)	/* VLAN Filter High */
+#define PSB6970_VFxH_TM_SHIFT	7		/* Tagged Member */
+
+/* --- Port registers --- */
+#define PSB6970_EC(p)		((p)*0x20+2)	/* Extended Control */
+#define PSB6970_EC_IFNTE	(1 << 1)	/* Input Force No Tag Enable */
+
+#define PSB6970_PBVM(p)		((p)*0x20+3)	/* Port Base VLAN Map */
+#define PSB6970_PBVM_VMCE	(1 << 8)
+#define PSB6970_PBVM_AOVTP	(1 << 9)
+#define PSB6970_PBVM_VSD	(1 << 10)
+#define PSB6970_PBVM_VC		(1 << 11)	/* VID Check with VID table */
+#define PSB6970_PBVM_TBVE	(1 << 13)	/* Tag-Based VLAN enable */
+
+#define PSB6970_DVID(p)		((p)*0x20+4)	/* Default VLAN ID & Priority */
+
+struct psb6970_priv {
+	struct switch_dev dev;
+	struct phy_device *phy;
+	u16 (*read) (struct phy_device* phydev, int reg);
+	void (*write) (struct phy_device* phydev, int reg, u16 val);
+	struct mutex reg_mutex;
+
+	/* all fields below are cleared on reset */
+	bool vlan;
+	u16 vlan_id[PSB6970_MAX_VLANS];
+	u8 vlan_table[PSB6970_MAX_VLANS];
+	u8 vlan_tagged;
+	u16 pvid[PSB6970_NUM_PORTS];
+};
+
+#define to_psb6970(_dev) container_of(_dev, struct psb6970_priv, dev)
+
+static u16 psb6970_mii_read(struct phy_device *phydev, int reg)
+{
+	return phydev->bus->read(phydev->bus, PHYADDR(reg));
+}
+
+static void psb6970_mii_write(struct phy_device *phydev, int reg, u16 val)
+{
+	phydev->bus->write(phydev->bus, PHYADDR(reg), val);
+}
+
+static int
+psb6970_set_vlan(struct switch_dev *dev, const struct switch_attr *attr,
+		 struct switch_val *val)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	priv->vlan = !!val->value.i;
+	return 0;
+}
+
+static int
+psb6970_get_vlan(struct switch_dev *dev, const struct switch_attr *attr,
+		 struct switch_val *val)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	val->value.i = priv->vlan;
+	return 0;
+}
+
+static int psb6970_set_pvid(struct switch_dev *dev, int port, int vlan)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+
+	/* make sure no invalid PVIDs get set */
+	if (vlan >= dev->vlans)
+		return -EINVAL;
+
+	priv->pvid[port] = vlan;
+	return 0;
+}
+
+static int psb6970_get_pvid(struct switch_dev *dev, int port, int *vlan)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	*vlan = priv->pvid[port];
+	return 0;
+}
+
+static int
+psb6970_set_vid(struct switch_dev *dev, const struct switch_attr *attr,
+		struct switch_val *val)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	priv->vlan_id[val->port_vlan] = val->value.i;
+	return 0;
+}
+
+static int
+psb6970_get_vid(struct switch_dev *dev, const struct switch_attr *attr,
+		struct switch_val *val)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	val->value.i = priv->vlan_id[val->port_vlan];
+	return 0;
+}
+
+static struct switch_attr psb6970_globals[] = {
+	{
+	 .type = SWITCH_TYPE_INT,
+	 .name = "enable_vlan",
+	 .description = "Enable VLAN mode",
+	 .set = psb6970_set_vlan,
+	 .get = psb6970_get_vlan,
+	 .max = 1},
+};
+
+static struct switch_attr psb6970_port[] = {
+};
+
+static struct switch_attr psb6970_vlan[] = {
+	{
+	 .type = SWITCH_TYPE_INT,
+	 .name = "pvid",
+	 .description = "VLAN ID",
+	 .set = psb6970_set_vid,
+	 .get = psb6970_get_vid,
+	 .max = 4094,
+	 },
+};
+
+static int psb6970_get_ports(struct switch_dev *dev, struct switch_val *val)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	u8 ports = priv->vlan_table[val->port_vlan];
+	int i;
+
+	val->len = 0;
+	for (i = 0; i < PSB6970_NUM_PORTS; i++) {
+		struct switch_port *p;
+
+		if (!(ports & (1 << i)))
+			continue;
+
+		p = &val->value.ports[val->len++];
+		p->id = i;
+		if (priv->vlan_tagged & (1 << i))
+			p->flags = (1 << SWITCH_PORT_FLAG_TAGGED);
+		else
+			p->flags = 0;
+	}
+	return 0;
+}
+
+static int psb6970_set_ports(struct switch_dev *dev, struct switch_val *val)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	u8 *vt = &priv->vlan_table[val->port_vlan];
+	int i, j;
+
+	*vt = 0;
+	for (i = 0; i < val->len; i++) {
+		struct switch_port *p = &val->value.ports[i];
+
+		if (p->flags & (1 << SWITCH_PORT_FLAG_TAGGED))
+			priv->vlan_tagged |= (1 << p->id);
+		else {
+			priv->vlan_tagged &= ~(1 << p->id);
+			priv->pvid[p->id] = val->port_vlan;
+
+			/* make sure that an untagged port does not
+			 * appear in other vlans */
+			for (j = 0; j < PSB6970_MAX_VLANS; j++) {
+				if (j == val->port_vlan)
+					continue;
+				priv->vlan_table[j] &= ~(1 << p->id);
+			}
+		}
+
+		*vt |= 1 << p->id;
+	}
+	return 0;
+}
+
+static int psb6970_hw_apply(struct switch_dev *dev)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	int i, j;
+
+	mutex_lock(&priv->reg_mutex);
+
+	if (priv->vlan) {
+		/* into the vlan translation unit */
+		for (j = 0; j < PSB6970_MAX_VLANS; j++) {
+			u8 vp = priv->vlan_table[j];
+
+			if (vp) {
+				priv->write(priv->phy, PSB6970_VFxL(j),
+					    PSB6970_VFxL_VV | priv->vlan_id[j]);
+				priv->write(priv->phy, PSB6970_VFxH(j),
+					    ((vp & priv->
+					      vlan_tagged) <<
+					     PSB6970_VFxH_TM_SHIFT) | vp);
+			} else	/* clear VLAN Valid flag for unused vlans */
+				priv->write(priv->phy, PSB6970_VFxL(j), 0);
+
+		}
+	}
+
+	/* update the port destination mask registers and tag settings */
+	for (i = 0; i < PSB6970_NUM_PORTS; i++) {
+		int dvid = 1, pbvm = 0x7f | PSB6970_PBVM_VSD, ec = 0;
+
+		if (priv->vlan) {
+			ec = PSB6970_EC_IFNTE;
+			dvid = priv->vlan_id[priv->pvid[i]];
+			pbvm |= PSB6970_PBVM_TBVE | PSB6970_PBVM_VMCE;
+
+			if ((i << 1) & priv->vlan_tagged)
+				pbvm |= PSB6970_PBVM_AOVTP | PSB6970_PBVM_VC;
+		}
+
+		priv->write(priv->phy, PSB6970_PBVM(i), pbvm);
+
+		if (!PSB6970_IS_CPU_PORT(i)) {
+			priv->write(priv->phy, PSB6970_EC(i), ec);
+			priv->write(priv->phy, PSB6970_DVID(i), dvid);
+		}
+	}
+
+	mutex_unlock(&priv->reg_mutex);
+	return 0;
+}
+
+static int psb6970_reset_switch(struct switch_dev *dev)
+{
+	struct psb6970_priv *priv = to_psb6970(dev);
+	int i;
+
+	mutex_lock(&priv->reg_mutex);
+
+	memset(&priv->vlan, 0, sizeof(struct psb6970_priv) -
+	       offsetof(struct psb6970_priv, vlan));
+
+	for (i = 0; i < PSB6970_MAX_VLANS; i++)
+		priv->vlan_id[i] = i;
+
+	mutex_unlock(&priv->reg_mutex);
+
+	return psb6970_hw_apply(dev);
+}
+
+static const struct switch_dev_ops psb6970_ops = {
+	.attr_global = {
+			.attr = psb6970_globals,
+			.n_attr = ARRAY_SIZE(psb6970_globals),
+			},
+	.attr_port = {
+		      .attr = psb6970_port,
+		      .n_attr = ARRAY_SIZE(psb6970_port),
+		      },
+	.attr_vlan = {
+		      .attr = psb6970_vlan,
+		      .n_attr = ARRAY_SIZE(psb6970_vlan),
+		      },
+	.get_port_pvid = psb6970_get_pvid,
+	.set_port_pvid = psb6970_set_pvid,
+	.get_vlan_ports = psb6970_get_ports,
+	.set_vlan_ports = psb6970_set_ports,
+	.apply_config = psb6970_hw_apply,
+	.reset_switch = psb6970_reset_switch,
+};
+
+static int psb6970_config_init(struct phy_device *pdev)
+{
+	struct psb6970_priv *priv;
+	struct net_device *dev = pdev->attached_dev;
+	struct switch_dev *swdev;
+	int ret;
+
+	priv = kzalloc(sizeof(struct psb6970_priv), GFP_KERNEL);
+	if (priv == NULL)
+		return -ENOMEM;
+
+	priv->phy = pdev;
+
+	if (pdev->addr == 0)
+		printk(KERN_INFO "%s: psb6970 switch driver attached.\n",
+		       pdev->attached_dev->name);
+
+	if (pdev->addr != 0) {
+		kfree(priv);
+		return 0;
+	}
+
+	pdev->supported = pdev->advertising = SUPPORTED_100baseT_Full;
+
+	mutex_init(&priv->reg_mutex);
+	priv->read = psb6970_mii_read;
+	priv->write = psb6970_mii_write;
+
+	pdev->priv = priv;
+
+	swdev = &priv->dev;
+	swdev->cpu_port = PSB6970_DEFAULT_PORT_CPU;
+	swdev->ops = &psb6970_ops;
+
+	swdev->name = "Lantiq PSB6970";
+	swdev->vlans = PSB6970_MAX_VLANS;
+	swdev->ports = PSB6970_NUM_PORTS;
+
+	if ((ret = register_switch(&priv->dev, pdev->attached_dev)) < 0) {
+		kfree(priv);
+		goto done;
+	}
+
+	ret = psb6970_reset_switch(&priv->dev);
+	if (ret) {
+		kfree(priv);
+		goto done;
+	}
+
+	dev->phy_ptr = priv;
+
+done:
+	return ret;
+}
+
+static int psb6970_read_status(struct phy_device *phydev)
+{
+	phydev->speed = SPEED_100;
+	phydev->duplex = DUPLEX_FULL;
+	phydev->link = 1;
+
+	phydev->state = PHY_RUNNING;
+	netif_carrier_on(phydev->attached_dev);
+	phydev->adjust_link(phydev->attached_dev);
+
+	return 0;
+}
+
+static int psb6970_config_aneg(struct phy_device *phydev)
+{
+	return 0;
+}
+
+static int psb6970_probe(struct phy_device *pdev)
+{
+	return 0;
+}
+
+static void psb6970_remove(struct phy_device *pdev)
+{
+	struct psb6970_priv *priv = pdev->priv;
+
+	if (!priv)
+		return;
+
+	if (pdev->addr == 0)
+		unregister_switch(&priv->dev);
+	kfree(priv);
+}
+
+static int psb6970_fixup(struct phy_device *dev)
+{
+	struct mii_bus *bus = dev->bus;
+	u16 reg;
+
+	/* look for the switch on the bus */
+	reg = bus->read(bus, PHYADDR(PSB6970_CI1)) & PSB6970_CI1_MASK;
+	if (reg != PSB6970_CI1_VAL)
+		return 0;
+
+	dev->phy_id = (reg << 16);
+	dev->phy_id |= bus->read(bus, PHYADDR(PSB6970_CI0)) & PSB6970_CI0_MASK;
+
+	return 0;
+}
+
+static struct phy_driver psb6970_driver = {
+	.name = "Lantiq PSB6970",
+	.phy_id = PSB6970_CI1_VAL << 16,
+	.phy_id_mask = 0xffff0000,
+	.features = PHY_BASIC_FEATURES,
+	.probe = psb6970_probe,
+	.remove = psb6970_remove,
+	.config_init = &psb6970_config_init,
+	.config_aneg = &psb6970_config_aneg,
+	.read_status = &psb6970_read_status,
+	.driver = {.owner = THIS_MODULE},
+};
+
+int __init psb6970_init(void)
+{
+	phy_register_fixup_for_id(PHY_ANY_ID, psb6970_fixup);
+	return phy_driver_register(&psb6970_driver);
+}
+
+module_init(psb6970_init);
+
+void __exit psb6970_exit(void)
+{
+	phy_driver_unregister(&psb6970_driver);
+}
+
+module_exit(psb6970_exit);
+
+MODULE_DESCRIPTION("Lantiq PSB6970 Switch");
+MODULE_AUTHOR("Ithamar R. Adema <ithamar.adema@team-embedded.nl>");
+MODULE_LICENSE("GPL");