Add a driver for Atheros AR8216 switches

Thanks to Vertical Communications, Inc. for providing access to the documentation

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15482 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 528 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/files/drivers/net/phy/ar8216.c b/target/linux/generic-2.6/files/drivers/net/phy/ar8216.c
new file mode 100644
index 0000000000..d83845c536
--- /dev/null
+++ b/target/linux/generic-2.6/files/drivers/net/phy/ar8216.c
@@ -0,0 +1,528 @@
+/*
+ * ar8216.c: AR8216 switch driver
+ *
+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/if.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/if_ether.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/netlink.h>
+#include <linux/bitops.h>
+#include <net/genetlink.h>
+#include <linux/switch.h>
+#include <linux/delay.h>
+#include <linux/phy.h>
+#include "ar8216.h"
+
+#define AR8216_REG_PORT_RATE(_i)	(AR8216_PORT_OFFSET(_i) + 0x000c)
+#define AR8216_REG_PORT_PRIO(_i)	(AR8216_PORT_OFFSET(_i) + 0x0010)
+
+struct ar8216_priv {
+	struct switch_dev dev;
+	struct phy_device *phy;
+	u32 (*read)(struct ar8216_priv *priv, int reg);
+	void (*write)(struct ar8216_priv *priv, int reg, u32 val);
+	/* all fields below are cleared on reset */
+	bool vlan;
+	u8 vlan_id[AR8216_NUM_VLANS];
+	u8 vlan_table[AR8216_NUM_VLANS];
+	u8 vlan_tagged;
+	u16 pvid[AR8216_NUM_PORTS];
+};
+static struct switch_dev athdev;
+
+#define to_ar8216(_dev) container_of(_dev, struct ar8216_priv, dev)
+
+static inline void
+split_addr(u32 regaddr, u16 *r1, u16 *r2, u16 *page)
+{
+	regaddr >>= 1;
+	*r1 = regaddr & 0x1e;
+
+	regaddr >>= 5;
+	*r2 = regaddr & 0x7;
+
+	regaddr >>= 3;
+	*page = regaddr & 0x1ff;
+}
+
+static u32
+ar8216_mii_read(struct ar8216_priv *priv, int reg)
+{
+	struct phy_device *phy = priv->phy;
+	u16 r1, r2, page;
+	u16 lo, hi;
+
+	split_addr((u32) reg, &r1, &r2, &page);
+	phy->bus->write(phy->bus, 0x18, 0, page);
+	lo = phy->bus->read(phy->bus, 0x10 | r2, r1);
+	hi = phy->bus->read(phy->bus, 0x10 | r2, r1 + 1);
+
+	return (hi << 16) | lo;
+}
+
+static void
+ar8216_mii_write(struct ar8216_priv *priv, int reg, u32 val)
+{
+	struct phy_device *phy = priv->phy;
+	u16 r1, r2, r3;
+	u16 lo, hi;
+
+	split_addr((u32) reg, &r1, &r2, &r3);
+	phy->bus->write(phy->bus, 0x18, 0, r3);
+
+	lo = val & 0xffff;
+	hi = (u16) (val >> 16);
+	phy->bus->write(phy->bus, 0x10 | r2, r1 + 1, hi);
+	phy->bus->write(phy->bus, 0x10 | r2, r1, lo);
+}
+
+static u32
+ar8216_rmw(struct ar8216_priv *priv, int reg, u32 mask, u32 val)
+{
+	u32 v;
+
+	v = priv->read(priv, reg);
+	v &= ~mask;
+	v |= val;
+	priv->write(priv, reg, v);
+
+	return v;
+}
+
+static int
+ar8216_set_vlan(struct switch_dev *dev, const struct switch_attr *attr,
+                struct switch_val *val)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	priv->vlan = !!val->value.i;
+	return 0;
+}
+
+static int
+ar8216_get_vlan(struct switch_dev *dev, const struct switch_attr *attr,
+                struct switch_val *val)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	val->value.i = priv->vlan;
+	return 0;
+}
+
+
+static int
+ar8216_set_pvid(struct switch_dev *dev, int port, int vlan)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	priv->pvid[port] = vlan;
+	return 0;
+}
+
+static int
+ar8216_get_pvid(struct switch_dev *dev, int port, int *vlan)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	*vlan = priv->pvid[port];
+	return 0;
+}
+
+static int
+ar8216_set_vid(struct switch_dev *dev, const struct switch_attr *attr,
+                struct switch_val *val)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	priv->vlan_id[val->port_vlan] = val->value.i;
+	return 0;
+}
+
+static int
+ar8216_get_vid(struct switch_dev *dev, const struct switch_attr *attr,
+                struct switch_val *val)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	val->value.i = priv->vlan_id[val->port_vlan];
+	return 0;
+}
+
+
+static struct switch_attr ar8216_globals[] = {
+	{
+		.type = SWITCH_TYPE_INT,
+		.name = "vlan",
+		.description = "Enable VLAN mode",
+		.set = ar8216_set_vlan,
+		.get = ar8216_get_vlan,
+		.max = 1
+	},
+};
+
+static struct switch_attr ar8216_port[] = {
+};
+
+static struct switch_attr ar8216_vlan[] = {
+	{
+		.type = SWITCH_TYPE_INT,
+		.name = "pvid",
+		.description = "VLAN ID",
+		.set = ar8216_set_vid,
+		.get = ar8216_get_vid,
+		.max = 4095,
+	},
+};
+
+
+static int
+ar8216_get_ports(struct switch_dev *dev, struct switch_val *val)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	u8 ports = priv->vlan_table[val->port_vlan];
+	int i;
+
+	val->len = 0;
+	for (i = 0; i < AR8216_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
+ar8216_set_ports(struct switch_dev *dev, struct switch_val *val)
+{
+	struct ar8216_priv *priv = to_ar8216(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 < AR8216_NUM_VLANS; j++) {
+				if (j == val->port_vlan)
+					continue;
+				priv->vlan_table[j] &= ~(1 << p->id);
+			}
+		}
+
+		*vt |= 1 << p->id;
+	}
+	return 0;
+}
+
+static int
+ar8216_wait_bit(struct ar8216_priv *priv, int reg, u32 mask, u32 val)
+{
+	int timeout = 20;
+
+	while ((priv->read(priv, reg) & mask) != val) {
+		if (timeout-- <= 0) {
+			printk(KERN_ERR "ar8216: timeout waiting for operation to complete\n");
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static void
+ar8216_vtu_op(struct ar8216_priv *priv, u32 op, u32 val)
+{
+	if (ar8216_wait_bit(priv, AR8216_REG_VTU, AR8216_VTU_ACTIVE, 0))
+		return;
+	if ((op & AR8216_VTU_OP) == AR8216_VTU_OP_LOAD) {
+		val &= AR8216_VTUDATA_MEMBER;
+		val |= AR8216_VTUDATA_VALID;
+		priv->write(priv, AR8216_REG_VTU_DATA, val);
+	}
+	op |= AR8216_VTU_ACTIVE;
+	priv->write(priv, AR8216_REG_VTU, op);
+}
+
+static int
+ar8216_hw_apply(struct switch_dev *dev)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	u8 portmask[AR8216_NUM_PORTS];
+	int i, j;
+
+	/* flush all vlan translation unit entries */
+	ar8216_vtu_op(priv, AR8216_VTU_OP_FLUSH, 0);
+
+	memset(portmask, 0, sizeof(portmask));
+	if (priv->vlan) {
+		/* calculate the port destination masks and load vlans
+		 * into the vlan translation unit */
+		for (j = 0; j < AR8216_NUM_VLANS; j++) {
+			u8 vp = priv->vlan_table[j];
+
+			if (!vp)
+				continue;
+
+			for (i = 0; i < AR8216_NUM_PORTS; i++) {
+				u8 mask = (1 << i);
+				if (vp & mask)
+					portmask[i] |= vp & ~mask;
+			}
+
+			if (!priv->vlan_table[j])
+				continue;
+
+			ar8216_vtu_op(priv,
+				AR8216_VTU_OP_LOAD |
+				(priv->vlan_id[j] << AR8216_VTU_VID_S),
+				priv->vlan_table[j]);
+		}
+	} else {
+		/* vlan disabled:
+		 * isolate all ports, but connect them to the cpu port */
+		for (i = 0; i < AR8216_NUM_PORTS; i++) {
+			if (i == AR8216_PORT_CPU)
+				continue;
+
+			portmask[i] = 1 << AR8216_PORT_CPU;
+			portmask[AR8216_PORT_CPU] |= (1 << i);
+		}
+	}
+
+	/* update the port destination mask registers and tag settings */
+	for (i = 0; i < AR8216_NUM_PORTS; i++) {
+		int egress, ingress;
+		int pvid;
+
+		if (priv->vlan) {
+			pvid = priv->vlan_id[priv->pvid[i]];
+		} else {
+			pvid = i;
+		}
+
+		if (priv->vlan && (priv->vlan_tagged & (1 << i))) {
+			egress = AR8216_OUT_ADD_VLAN;
+			ingress = AR8216_IN_PORT_FALLBACK;
+		} else {
+			egress = AR8216_OUT_STRIP_VLAN;
+			ingress = AR8216_IN_SECURE;
+		}
+
+		ar8216_rmw(priv, AR8216_REG_PORT_CTRL(i),
+			AR8216_PORT_CTRL_LEARN | AR8216_PORT_CTRL_VLAN_MODE |
+			AR8216_PORT_CTRL_SINGLE_VLAN | AR8216_PORT_CTRL_STATE |
+			AR8216_PORT_CTRL_HEADER | AR8216_PORT_CTRL_LEARN_LOCK,
+			AR8216_PORT_CTRL_LEARN |
+			  (egress << AR8216_PORT_CTRL_VLAN_MODE_S) |
+			  (priv->vlan ? AR8216_PORT_CTRL_SINGLE_VLAN : 0) |
+			  (AR8216_PORT_STATE_FORWARD << AR8216_PORT_CTRL_STATE_S));
+
+		ar8216_rmw(priv, AR8216_REG_PORT_VLAN(i),
+			AR8216_PORT_VLAN_DEST_PORTS | AR8216_PORT_VLAN_MODE |
+			  AR8216_PORT_VLAN_DEFAULT_ID,
+			(portmask[i] << AR8216_PORT_VLAN_DEST_PORTS_S) |
+			  (ingress << AR8216_PORT_VLAN_MODE_S) |
+			  (pvid << AR8216_PORT_VLAN_DEFAULT_ID_S));
+	}
+
+	return 0;
+}
+
+static int
+ar8216_reset_switch(struct switch_dev *dev)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+	int i;
+
+	memset(&priv->vlan, 0, sizeof(struct ar8216_priv) -
+		offsetof(struct ar8216_priv, vlan));
+	for (i = 0; i < AR8216_NUM_VLANS; i++) {
+		priv->vlan_id[i] = i;
+	}
+	for (i = 0; i < AR8216_NUM_PORTS; i++) {
+		/* Enable port learning and tx */
+		priv->write(priv, AR8216_REG_PORT_CTRL(i),
+			AR8216_PORT_CTRL_LEARN |
+			(4 << AR8216_PORT_CTRL_STATE_S));
+
+		priv->write(priv, AR8216_REG_PORT_VLAN(i), 0);
+
+		/* Configure all PHYs */
+		if (i == AR8216_PORT_CPU) {
+			priv->write(priv, AR8216_REG_PORT_STATUS(i),
+				AR8216_PORT_STATUS_LINK_UP |
+				AR8216_PORT_STATUS_SPEED |
+				AR8216_PORT_STATUS_TXMAC |
+				AR8216_PORT_STATUS_RXMAC |
+				AR8216_PORT_STATUS_DUPLEX);
+		} else {
+			priv->write(priv, AR8216_REG_PORT_STATUS(i),
+				AR8216_PORT_STATUS_LINK_AUTO);
+		}
+	}
+	/* XXX: undocumented magic from atheros, required! */
+	priv->write(priv, 0x38, 0xc000050e);
+	return ar8216_hw_apply(dev);
+}
+
+static int
+ar8216_config_init(struct phy_device *pdev)
+{
+	struct ar8216_priv *priv;
+	int ret;
+
+	printk("%s: AR8216 PHY driver attached.\n", pdev->attached_dev->name);
+	pdev->supported = ADVERTISED_100baseT_Full;
+	pdev->advertising = ADVERTISED_100baseT_Full;
+
+	priv = kzalloc(sizeof(struct ar8216_priv), GFP_KERNEL);
+	if (priv == NULL)
+		return -ENOMEM;
+
+	priv->phy = pdev;
+	priv->read = ar8216_mii_read;
+	priv->write = ar8216_mii_write;
+	memcpy(&priv->dev, &athdev, sizeof(struct switch_dev));
+	pdev->priv = priv;
+	if ((ret = register_switch(&priv->dev, pdev->attached_dev)) < 0) {
+		kfree(priv);
+		goto done;
+	}
+
+	ret = ar8216_reset_switch(&priv->dev);
+done:
+	return ret;
+}
+
+static int
+ar8216_read_status(struct phy_device *phydev)
+{
+	struct ar8216_priv *priv = phydev->priv;
+
+	phydev->speed = SPEED_100;
+	phydev->duplex = DUPLEX_FULL;
+	phydev->state = PHY_UP;
+
+	/* flush the address translation unit */
+	if (ar8216_wait_bit(priv, AR8216_REG_ATU, AR8216_ATU_ACTIVE, 0))
+		return -ETIMEDOUT;
+
+	priv->write(priv, AR8216_REG_ATU, AR8216_ATU_OP_FLUSH);
+
+	return 0;
+}
+
+static int
+ar8216_config_aneg(struct phy_device *phydev)
+{
+	return 0;
+}
+
+static int
+ar8216_probe(struct phy_device *pdev)
+{
+	struct ar8216_priv priv;
+
+	u8 id, rev;
+	u32 val;
+
+	priv.phy = pdev;
+	val = ar8216_mii_read(&priv, AR8216_REG_CTRL);
+	rev = val & 0xff;
+	id = (val >> 8) & 0xff;
+	if ((id != 1) || (rev != 1))
+		return -ENODEV;
+
+	return 0;
+}
+
+static void
+ar8216_remove(struct phy_device *pdev)
+{
+	struct ar8216_priv *priv = pdev->priv;
+
+	if (!priv)
+		return;
+
+	unregister_switch(&priv->dev);
+	kfree(priv);
+}
+
+/* template */
+static struct switch_dev athdev = {
+	.name = "Atheros AR8216",
+	.cpu_port = AR8216_PORT_CPU,
+	.ports = AR8216_NUM_PORTS,
+	.vlans = AR8216_NUM_VLANS,
+	.attr_global = {
+		.attr = ar8216_globals,
+		.n_attr = ARRAY_SIZE(ar8216_globals),
+	},
+	.attr_port = {
+		.attr = ar8216_port,
+		.n_attr = ARRAY_SIZE(ar8216_port),
+	},
+	.attr_vlan = {
+		.attr = ar8216_vlan,
+		.n_attr = ARRAY_SIZE(ar8216_vlan),
+	},
+	.get_port_pvid = ar8216_get_pvid,
+	.set_port_pvid = ar8216_set_pvid,
+	.get_vlan_ports = ar8216_get_ports,
+	.set_vlan_ports = ar8216_set_ports,
+	.apply_config = ar8216_hw_apply,
+	.reset_switch = ar8216_reset_switch,
+};
+
+static struct phy_driver ar8216_driver = {
+	.name		= "Atheros AR8216",
+	.features	= PHY_BASIC_FEATURES,
+	.probe		= ar8216_probe,
+	.remove		= ar8216_remove,
+	.config_init	= &ar8216_config_init,
+	.config_aneg	= &ar8216_config_aneg,
+	.read_status	= &ar8216_read_status,
+	.driver		= { .owner = THIS_MODULE },
+};
+
+int __init
+ar8216_init(void)
+{
+	return phy_driver_register(&ar8216_driver);
+}
+
+void __exit
+ar8216_exit(void)
+{
+	phy_driver_unregister(&ar8216_driver);
+}
+
+module_init(ar8216_init);
+module_exit(ar8216_exit);
+MODULE_LICENSE("GPL");
+