add IC+ IP175C driver (based on Patrick Horn's driver, see #4050)

SVN-Revision: 15305

1 files changed, 1342 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/files/drivers/net/phy/ip175c.c b/target/linux/generic-2.6/files/drivers/net/phy/ip175c.c
new file mode 100644
index 0000000..7c44783
--- /dev/null
+++ b/target/linux/generic-2.6/files/drivers/net/phy/ip175c.c
@@ -0,0 +1,1342 @@
+/*
+ * swconfig-ip175c.c: Swconfig configuration for IC+ IP175C switch
+ *
+ * Copyright (C) 2008 Patrick Horn <patrick.horn@gmail.com>
+ * Copyright (C) 2008 Martin Mares <mj@ucw.cz>
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/delay.h>
+#include <linux/switch.h>
+
+#define MAX_VLANS 16
+#define MAX_PORTS 9
+
+typedef struct ip175c_reg {
+	u16 p;			// phy
+	u16 m;			// mii
+} reg;
+typedef char bitnum;
+
+#define NOTSUPPORTED {-1,-1}
+
+#define REG_SUPP(x) (((x).m != ((u16)-1)) && ((x).p != (u16)-1))
+
+/*********** CONSTANTS ***********/
+struct register_mappings {
+	char *NAME;
+	u16 MODEL_NO;			// compare to bits 4-9 of MII register 0,3.
+	bitnum NUM_PORTS;
+	bitnum CPU_PORT;
+
+/* The default VLAN for each port.
+	 Default: 0x0001 for Ports 0,1,2,3
+		  0x0002 for Ports 4,5 */
+	reg VLAN_DEFAULT_TAG_REG[MAX_PORTS];
+
+/* These ports are tagged.
+	 Default: 0x00 */
+	reg ADD_TAG_REG;
+	reg REMOVE_TAG_REG;
+	bitnum ADD_TAG_BIT[MAX_PORTS];
+/* These ports are untagged.
+	 Default: 0x00 (i.e. do not alter any VLAN tags...)
+	 Maybe set to 0 if user disables VLANs. */
+	bitnum REMOVE_TAG_BIT[MAX_PORTS];
+
+/* Port M and Port N are on the same VLAN.
+	 Default: All ports on all VLANs. */
+// Use register {29, 19+N/2}
+	reg VLAN_LOOKUP_REG;
+// Port 5 uses register {30, 18} but same as odd bits.
+	reg VLAN_LOOKUP_REG_5;		// in a different register on IP175C.
+	bitnum VLAN_LOOKUP_EVEN_BIT[MAX_PORTS];
+	bitnum VLAN_LOOKUP_ODD_BIT[MAX_PORTS];
+
+/* This VLAN corresponds to which ports.
+	 Default: 0x2f,0x30,0x3f,0x3f... */
+	reg TAG_VLAN_MASK_REG;
+	bitnum TAG_VLAN_MASK_EVEN_BIT[MAX_PORTS];
+	bitnum TAG_VLAN_MASK_ODD_BIT[MAX_PORTS];
+
+	int RESET_VAL;
+	reg RESET_REG;
+
+	reg MODE_REG;
+	int MODE_VAL;
+
+/* General flags */
+	reg ROUTER_CONTROL_REG;
+	reg VLAN_CONTROL_REG;
+	bitnum TAG_VLAN_BIT;
+	bitnum ROUTER_EN_BIT;
+	bitnum NUMLAN_GROUPS_MAX;
+	bitnum NUMLAN_GROUPS_BIT;
+
+	reg MII_REGISTER_EN;
+	bitnum MII_REGISTER_EN_BIT;
+
+	// set to 1 for 178C, 0 for 175C.
+	bitnum SIMPLE_VLAN_REGISTERS;	// 175C has two vlans per register but 178C has only one.
+};
+
+static const struct register_mappings IP178C = {
+	.NAME = "IP178C",
+	.MODEL_NO = 0x18,
+	.VLAN_DEFAULT_TAG_REG = {
+		{30,3},{30,4},{30,5},{30,6},{30,7},{30,8},
+		{30,9},{30,10},{30,11},
+	},
+
+	.ADD_TAG_REG = {30,12},
+	.ADD_TAG_BIT = {0,1,2,3,4,5,6,7,8},
+	.REMOVE_TAG_REG = {30,13},
+	.REMOVE_TAG_BIT = {4,5,6,7,8,9,10,11,12},
+
+	.SIMPLE_VLAN_REGISTERS = 1,
+
+	.VLAN_LOOKUP_REG = {31,0},// +N
+	.VLAN_LOOKUP_REG_5 = NOTSUPPORTED, // not used with SIMPLE_VLAN_REGISTERS
+	.VLAN_LOOKUP_EVEN_BIT = {0,1,2,3,4,5,6,7,8},
+	.VLAN_LOOKUP_ODD_BIT = {0,1,2,3,4,5,6,7,8},
+
+	.TAG_VLAN_MASK_REG = {30,14}, // +N
+	.TAG_VLAN_MASK_EVEN_BIT = {0,1,2,3,4,5,6,7,8},
+	.TAG_VLAN_MASK_ODD_BIT = {0,1,2,3,4,5,6,7,8},
+
+	.RESET_VAL = 0x55AA,
+	.RESET_REG = {30,0},
+	.MODE_VAL = 0,
+	.MODE_REG = NOTSUPPORTED,
+
+	.ROUTER_CONTROL_REG = {30,30},
+	.ROUTER_EN_BIT = 11,
+	.NUMLAN_GROUPS_MAX = 8,
+	.NUMLAN_GROUPS_BIT = 8, // {0-2}
+
+	.VLAN_CONTROL_REG = {30,13},
+	.TAG_VLAN_BIT = 3,
+
+	.CPU_PORT = 8,
+	.NUM_PORTS = 9,
+
+	.MII_REGISTER_EN = NOTSUPPORTED,
+
+};
+
+static const struct register_mappings IP175C = {
+	.NAME = "IP175C",
+	.MODEL_NO = 0x18,
+	.VLAN_DEFAULT_TAG_REG = {
+		{29,24},{29,25},{29,26},{29,27},{29,28},{29,30},
+		NOTSUPPORTED,NOTSUPPORTED,NOTSUPPORTED
+	},
+
+	.ADD_TAG_REG = {29,23},
+	.REMOVE_TAG_REG = {29,23},
+	.ADD_TAG_BIT = {11,12,13,14,15,1,-1,-1,-1},
+	.REMOVE_TAG_BIT = {6,7,8,9,10,0,-1,-1,-1},
+
+	.SIMPLE_VLAN_REGISTERS = 0,
+
+	.VLAN_LOOKUP_REG = {29,19},// +N/2
+	.VLAN_LOOKUP_REG_5 = {30,18},
+	.VLAN_LOOKUP_EVEN_BIT = {8,9,10,11,12,15,-1,-1,-1},
+	.VLAN_LOOKUP_ODD_BIT = {0,1,2,3,4,7,-1,-1,-1},
+
+	.TAG_VLAN_MASK_REG = {30,1}, // +N/2
+	.TAG_VLAN_MASK_EVEN_BIT = {0,1,2,3,4,5,-1,-1,-1},
+	.TAG_VLAN_MASK_ODD_BIT = {8,9,10,11,12,13,-1,-1,-1},
+
+	.RESET_VAL = 0x175C,
+	.RESET_REG = {30,0},
+	.MODE_VAL = 0x175C,
+	.MODE_REG = {29,31},
+
+	.ROUTER_CONTROL_REG = {30,9},
+	.ROUTER_EN_BIT = 3,
+	.NUMLAN_GROUPS_MAX = 8,
+	.NUMLAN_GROUPS_BIT = 0, // {0-2}
+
+	.VLAN_CONTROL_REG = {30,9},
+	.TAG_VLAN_BIT = 7,
+
+	.NUM_PORTS = 6,
+	.CPU_PORT = 5,
+
+	.MII_REGISTER_EN = NOTSUPPORTED,
+
+};
+
+static const struct register_mappings IP175A = {
+	.NAME = "IP175A",
+	.MODEL_NO = 0x05,
+	.VLAN_DEFAULT_TAG_REG = {
+		{0,24},{0,25},{0,26},{0,27},{0,28},NOTSUPPORTED,
+		NOTSUPPORTED,NOTSUPPORTED,NOTSUPPORTED
+	},
+
+	.ADD_TAG_REG = {0,23},
+	.REMOVE_TAG_REG = {0,23},
+	.ADD_TAG_BIT = {11,12,13,14,15,1,-1,-1,-1},
+	.REMOVE_TAG_BIT = {6,7,8,9,10,0,-1,-1,-1},
+
+	.SIMPLE_VLAN_REGISTERS = 1,
+
+	// Only programmable via. EEPROM
+	.VLAN_LOOKUP_REG = NOTSUPPORTED,// +N/2
+	.VLAN_LOOKUP_REG_5 = NOTSUPPORTED,
+	.VLAN_LOOKUP_EVEN_BIT = {8,9,10,11,12,15,-1,-1,-1},
+	.VLAN_LOOKUP_ODD_BIT = {0,1,2,3,4,7,-1,-1,-1},
+
+	.TAG_VLAN_MASK_REG = NOTSUPPORTED, // +N/2
+	.TAG_VLAN_MASK_EVEN_BIT = {0,1,2,3,4,5,-1,-1,-1},
+	.TAG_VLAN_MASK_ODD_BIT = {8,9,10,11,12,13,-1,-1,-1},
+
+	.RESET_VAL = -1,
+	.RESET_REG = NOTSUPPORTED,
+	.MODE_VAL = 0,
+	.MODE_REG = NOTSUPPORTED,
+
+	.ROUTER_CONTROL_REG = NOTSUPPORTED,
+	.VLAN_CONTROL_REG = NOTSUPPORTED,
+	.TAG_VLAN_BIT = -1,
+	.ROUTER_EN_BIT = -1,
+	.NUMLAN_GROUPS_MAX = -1,
+	.NUMLAN_GROUPS_BIT = -1, // {0-2}
+
+	.NUM_PORTS = 6,
+	.CPU_PORT = 5,
+
+	.MII_REGISTER_EN = {0, 12},
+	.MII_REGISTER_EN_BIT = 7,
+};
+
+struct ip175c_state {
+	struct switch_dev dev;
+	struct mii_bus *mii_bus;
+	bool registered;
+
+	int router_mode;		// ROUTER_EN
+	int vlan_enabled;		// TAG_VLAN_EN
+	struct port_state {
+		struct phy_device *phy;
+		unsigned int shareports;
+		u16 vlan_tag;
+	} ports[MAX_PORTS];
+	unsigned int add_tag;
+	unsigned int remove_tag;
+	int num_vlans;
+	unsigned int vlan_ports[MAX_VLANS];
+	const struct register_mappings *regs;
+	reg proc_mii; /*!< phy/reg for the low level register access via /proc */
+	int proc_errno; /*!< error code of the last read/write to "val" */
+
+	char buf[80];
+};
+
+static int getPhy (struct ip175c_state *state, reg mii)
+{
+	struct mii_bus *bus = state->mii_bus;
+	int err;
+
+	if (!REG_SUPP(mii))
+		return -EFAULT;
+	mutex_lock(&bus->mdio_lock);
+	err = bus->read(bus, mii.p, mii.m);
+	mutex_unlock(&bus->mdio_lock);
+	if (err < 0) {
+		state->proc_errno = err;
+		pr_warning("IP175C: Unable to get MII register %d,%d: error %d\n", mii.p,mii.m,-err);
+		return err;
+	}
+
+	pr_debug("IP175C: Read MII register %d,%d -> %04x\n", mii.p, mii.m, err);
+	return err;
+}
+
+static int setPhy (struct ip175c_state *state, reg mii, u16 value)
+{
+	struct mii_bus *bus = state->mii_bus;
+	int err;
+
+	if (!REG_SUPP(mii))
+		return -EFAULT;
+	mutex_lock(&bus->mdio_lock);
+	err = bus->write(bus, mii.p, mii.m, value);
+	mutex_unlock(&bus->mdio_lock);
+	if (err < 0) {
+		state->proc_errno = err;
+		pr_warning("IP175C: Unable to set MII register %d,%d to %d: error %d\n", mii.p,mii.m,value,-err);
+		return err;
+	}
+	mdelay(2);
+	getPhy(state, mii);
+	pr_debug("IP175C: Set MII register %d,%d to %04x\n", mii.p, mii.m, value);
+	return 0;
+}
+
+/**
+ * These two macros are to simplify the mapping of logical bits to the bits in hardware.
+ * NOTE: these macros will return if there is an error!
+ */
+
+#define GET_PORT_BITS(state, bits, addr, bit_lookup)		\
+	do {							\
+		int i, val = getPhy((state), (addr));		\
+		if (val < 0)					\
+			return val;				\
+		(bits) = 0;					\
+		for (i = 0; i < MAX_PORTS; i++) {		\
+			if ((bit_lookup)[i] == -1) continue;	\
+			if (val & (1<<(bit_lookup)[i]))		\
+				(bits) |= (1<<i);		\
+		}						\
+	} while (0)
+
+#define SET_PORT_BITS(state, bits, addr, bit_lookup)		\
+	do {							\
+		int i, val = getPhy((state), (addr));		\
+		if (val < 0)					\
+			return val;				\
+		for (i = 0; i < MAX_PORTS; i++) {		\
+			unsigned int newmask = ((bits)&(1<<i));	\
+			if ((bit_lookup)[i] == -1) continue;	\
+			val &= ~(1<<(bit_lookup)[i]);		\
+			val |= ((newmask>>i)<<(bit_lookup)[i]);	\
+		}						\
+		val = setPhy((state), (addr), val);		\
+		if (val < 0)					\
+			return val;				\
+	} while (0)
+
+static int get_model(struct ip175c_state *state)
+{
+	reg oui_id_reg = {0, 2};
+	int oui_id;
+	reg model_no_reg = {0, 3};
+	int model_no, model_no_orig;
+
+	// 175 and 178 have the same oui ID.
+	reg oui_id_reg_178c = {5, 2}; // returns error on IP175C.
+	int is_178c = 0;
+
+	oui_id = getPhy(state, oui_id_reg);
+	if (oui_id != 0x0243) {
+		// non
+		return -ENODEV; // Not a IC+ chip.
+	}
+	oui_id = getPhy(state, oui_id_reg_178c);
+	if (oui_id == 0x0243) {
+		is_178c = 1;
+	}
+
+	model_no_orig = getPhy(state, model_no_reg);
+	if (model_no_orig < 0) {
+		return -ENODEV;
+	}
+	model_no = model_no_orig >> 4; // shift out revision number.
+	model_no &= 0x3f; // only take the model number (low 6 bits).
+	if (model_no == IP175A.MODEL_NO) {
+		state->regs = &IP175A;
+	} else if (model_no == IP175C.MODEL_NO) {
+		if (is_178c) {
+			state->regs = &IP178C;
+		} else {
+			state->regs = &IP175C;
+		}
+	} else {
+		printk(KERN_WARNING "ip175c: Found an unknown IC+ switch with model number %02Xh.\n", model_no_orig);
+		return -EPERM;
+	}
+	return 0;
+}
+
+/** Get only the vlan and router flags on the router **/
+static int get_flags(struct ip175c_state *state)
+{
+	int val;
+
+	state->router_mode = 0;
+	state->vlan_enabled = -1; // hack
+	state->num_vlans = 0;
+
+	if (!REG_SUPP(state->regs->ROUTER_CONTROL_REG)) {
+		return 0; // not an error if it doesn't support enable vlan.
+	}
+
+	val = getPhy(state, state->regs->ROUTER_CONTROL_REG);
+	if (val < 0) {
+		return val;
+	}
+	if (state->regs->ROUTER_EN_BIT >= 0)
+		state->router_mode = ((val>>state->regs->ROUTER_EN_BIT) & 1);
+
+	if (state->regs->NUMLAN_GROUPS_BIT >= 0) {
+		state->num_vlans = (val >> state->regs->NUMLAN_GROUPS_BIT);
+		state->num_vlans &= (state->regs->NUMLAN_GROUPS_MAX-1);
+		state->num_vlans+=1; // does not include WAN.
+	}
+
+
+	val = getPhy(state, state->regs->VLAN_CONTROL_REG);
+	if (val < 0) {
+		return 0;
+	}
+	if (state->regs->TAG_VLAN_BIT >= 0)
+		state->vlan_enabled = ((val>>state->regs->TAG_VLAN_BIT) & 1);
+
+	return  0;
+}
+/** Get all state variables for VLAN mappings and port-based tagging. **/
+static int get_state(struct ip175c_state *state)
+{
+	int i, j;
+	int ret;
+	ret = get_flags(state);
+	if (ret < 0) {
+		return ret;
+	}
+	GET_PORT_BITS(state, state->remove_tag,
+				  state->regs->REMOVE_TAG_REG, state->regs->REMOVE_TAG_BIT);
+	GET_PORT_BITS(state, state->add_tag,
+				  state->regs->ADD_TAG_REG, state->regs->ADD_TAG_BIT);
+
+	if (state->vlan_enabled == -1) {
+		// not sure how to get this...
+		state->vlan_enabled = (!state->remove_tag && !state->add_tag);
+	}
+
+	if (REG_SUPP(state->regs->VLAN_LOOKUP_REG)) {
+	for (j=0; j<MAX_PORTS; j++) {
+		state->ports[j].shareports = 0; // initialize them in case.
+	}
+	for (j=0; j<state->regs->NUM_PORTS; j++) {
+		reg addr;
+		const bitnum *bit_lookup = (j%2==0)?
+			state->regs->VLAN_LOOKUP_EVEN_BIT:
+			state->regs->VLAN_LOOKUP_ODD_BIT;
+		addr = state->regs->VLAN_LOOKUP_REG;
+		if (state->regs->SIMPLE_VLAN_REGISTERS) {
+			addr.m += j;
+		} else {
+			switch (j) {
+			case 0:
+			case 1:
+				break;
+			case 2:
+			case 3:
+				addr.m+=1;
+				break;
+			case 4:
+				addr.m+=2;
+				break;
+			case 5:
+				addr = state->regs->VLAN_LOOKUP_REG_5;
+				break;
+			}
+		}
+
+		if (REG_SUPP(addr)) {
+			GET_PORT_BITS(state, state->ports[j].shareports, addr, bit_lookup);
+		}
+	}
+	} else {
+		for (j=0; j<MAX_PORTS; j++) {
+			state->ports[j].shareports = 0xff;
+		}
+	}
+
+	for (i=0; i<MAX_PORTS; i++) {
+		if (REG_SUPP(state->regs->VLAN_DEFAULT_TAG_REG[i])) {
+			int val = getPhy(state, state->regs->VLAN_DEFAULT_TAG_REG[i]);
+			if (val < 0) {
+				return val;
+			}
+			state->ports[i].vlan_tag = val;
+		} else {
+			state->ports[i].vlan_tag = 0;
+		}
+	}
+
+	if (REG_SUPP(state->regs->TAG_VLAN_MASK_REG)) {
+		for (j=0; j<MAX_VLANS; j++) {
+			reg addr = state->regs->TAG_VLAN_MASK_REG;
+			const bitnum *bit_lookup = (j%2==0)?
+				state->regs->TAG_VLAN_MASK_EVEN_BIT:
+				state->regs->TAG_VLAN_MASK_ODD_BIT;
+			if (state->regs->SIMPLE_VLAN_REGISTERS) {
+				addr.m += j;
+			} else {
+				addr.m += j/2;
+			}
+			GET_PORT_BITS(state, state->vlan_ports[j], addr, bit_lookup);
+		}
+	} else {
+		for (j=0; j<MAX_VLANS; j++) {
+			state->vlan_ports[j] = 0;
+			for (i=0; i<state->regs->NUM_PORTS; i++) {
+				if ((state->ports[i].vlan_tag == j) ||
+						(state->ports[i].vlan_tag == 0)) {
+					state->vlan_ports[j] |= (1<<i);
+				}
+			}
+		}
+	}
+
+	return 0;
+}
+
+
+/** Only update vlan and router flags in the switch **/
+static int update_flags(struct ip175c_state *state)
+{
+	int val;
+
+	if (!REG_SUPP(state->regs->ROUTER_CONTROL_REG)) {
+		return 0;
+	}
+
+	val = getPhy(state, state->regs->ROUTER_CONTROL_REG);
+	if (val < 0) {
+		return val;
+	}
+	if (state->regs->ROUTER_EN_BIT >= 0) {
+		if (state->router_mode) {
+			val |= (1<<state->regs->ROUTER_EN_BIT);
+		} else {
+			val &= (~(1<<state->regs->ROUTER_EN_BIT));
+		}
+	}
+	if (state->regs->TAG_VLAN_BIT >= 0) {
+		if (state->vlan_enabled) {
+			val |= (1<<state->regs->TAG_VLAN_BIT);
+		} else {
+			val &= (~(1<<state->regs->TAG_VLAN_BIT));
+		}
+	}
+	if (state->regs->NUMLAN_GROUPS_BIT >= 0) {
+		val &= (~((state->regs->NUMLAN_GROUPS_MAX-1)<<state->regs->NUMLAN_GROUPS_BIT));
+		if (state->num_vlans > state->regs->NUMLAN_GROUPS_MAX) {
+			val |= state->regs->NUMLAN_GROUPS_MAX << state->regs->NUMLAN_GROUPS_BIT;
+		} else if (state->num_vlans >= 1) {
+			val |= (state->num_vlans-1) << state->regs->NUMLAN_GROUPS_BIT;
+		}
+	}
+	return setPhy(state, state->regs->ROUTER_CONTROL_REG, val);
+}
+
+/** Update all VLAN and port state.  Usually you should call "correct_vlan_state" first. **/
+static int update_state(struct ip175c_state *state)
+{
+	int j;
+	int i;
+	SET_PORT_BITS(state, state->add_tag,
+				  state->regs->ADD_TAG_REG, state->regs->ADD_TAG_BIT);
+	SET_PORT_BITS(state, state->remove_tag,
+				  state->regs->REMOVE_TAG_REG, state->regs->REMOVE_TAG_BIT);
+
+	if (REG_SUPP(state->regs->VLAN_LOOKUP_REG)) {
+	for (j=0; j<state->regs->NUM_PORTS; j++) {
+		reg addr;
+		const bitnum *bit_lookup = (j%2==0)?
+			state->regs->VLAN_LOOKUP_EVEN_BIT:
+			state->regs->VLAN_LOOKUP_ODD_BIT;
+
+		// duplicate code -- sorry
+		addr = state->regs->VLAN_LOOKUP_REG;
+		if (state->regs->SIMPLE_VLAN_REGISTERS) {
+			addr.m += j;
+		} else {
+			switch (j) {
+			case 0:
+			case 1:
+				break;
+			case 2:
+			case 3:
+				addr.m+=1;
+				break;
+			case 4:
+				addr.m+=2;
+				break;
+			case 5:
+				addr = state->regs->VLAN_LOOKUP_REG_5;
+				break;
+			default:
+				addr.m = -1; // shouldn't get here, but...
+				break;
+			}
+		}
+		//printf("shareports for %d is %02X\n",j,state->ports[j].shareports);
+		if (REG_SUPP(addr)) {
+			SET_PORT_BITS(state, state->ports[j].shareports, addr, bit_lookup);
+		}
+	}
+	}
+	if (REG_SUPP(state->regs->TAG_VLAN_MASK_REG)) {
+	for (j=0; j<MAX_VLANS; j++) {
+		reg addr = state->regs->TAG_VLAN_MASK_REG;
+		const bitnum *bit_lookup = (j%2==0)?
+			state->regs->TAG_VLAN_MASK_EVEN_BIT:
+			state->regs->TAG_VLAN_MASK_ODD_BIT;
+		unsigned int vlan_mask;
+		if (state->regs->SIMPLE_VLAN_REGISTERS) {
+			addr.m += j;
+		} else {
+			addr.m += j/2;
+		}
+		vlan_mask = state->vlan_ports[j];
+		SET_PORT_BITS(state, vlan_mask, addr, bit_lookup);
+	}
+	}
+
+	for (i=0; i<MAX_PORTS; i++) {
+		if (REG_SUPP(state->regs->VLAN_DEFAULT_TAG_REG[i])) {
+			int err = setPhy(state, state->regs->VLAN_DEFAULT_TAG_REG[i],
+				 	state->ports[i].vlan_tag);
+			if (err < 0) {
+				return err;
+			}
+		}
+	}
+
+	return update_flags(state);
+
+	// software reset: 30.0 = 0x175C
+	// wait 2ms
+	// reset ports 0,1,2,3,4
+}
+
+/*
+  Uses only the VLAN port mask and the add tag mask to generate the other fields:
+  which ports are part of the same VLAN, removing vlan tags, and VLAN tag ids.
+ */
+static void correct_vlan_state(struct ip175c_state *state)
+{
+	int i, j;
+	state->num_vlans = 0;
+	for (i=0; i<MAX_VLANS; i++) {
+		if (state->vlan_ports[i] != 0) {
+			state->num_vlans = i+1; //hack -- we need to store the "set" vlans somewhere...
+		}
+	}
+
+	for (i=0; i<state->regs->NUM_PORTS; i++) {
+		int oldtag = state->ports[i].vlan_tag;
+		if (oldtag >= 0 && oldtag < MAX_VLANS) {
+			if (state->vlan_ports[oldtag] & (1<<i)) {
+				continue; // primary vlan is valid.
+			}
+		}
+		state->ports[i].vlan_tag = 0;
+	}
+
+	for (i=0; i<state->regs->NUM_PORTS; i++) {
+		unsigned int portmask = (1<<i);
+		state->ports[i].shareports = portmask;
+		for (j=0; j<MAX_VLANS; j++) {
+			if (state->vlan_ports[j] & portmask) {
+				state->ports[i].shareports |= state->vlan_ports[j];
+				if (state->ports[i].vlan_tag == 0) {
+					state->ports[i].vlan_tag = j;
+				}
+			}
+		}
+		if (!state->vlan_enabled) {
+			// share with everybody!
+			state->ports[i].shareports = (1<<state->regs->NUM_PORTS)-1;
+		}
+	}
+	state->remove_tag = ((~state->add_tag) & ((1<<state->regs->NUM_PORTS)-1));
+}
+
+static int ip175c_get_enable_vlan(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int err;
+
+	err = get_state(state); // may be set in get_state.
+	if (err < 0)
+		return err;
+	val->value.i = state->vlan_enabled;
+	return 0;
+}
+
+static int ip175c_set_enable_vlan(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int err;
+	int enable;
+	int i;
+
+	err = get_state(state);
+	if (err < 0)
+		return err;
+	enable = val->value.i;
+
+	if (state->vlan_enabled == enable) {
+		// do not change any state.
+		return 0;
+	}
+	state->vlan_enabled = enable;
+
+	// Otherwise, if we are switching state, set fields to a known default.
+	state->remove_tag = 0x0000;
+	state->add_tag = 0x0000;
+	for (i = 0; i < MAX_PORTS; i++) {
+		state->ports[i].vlan_tag = 0;
+		state->ports[i].shareports = 0xffff;
+	}
+	for (i = 0; i < MAX_VLANS; i++) {
+		state->vlan_ports[i] = 0x0;
+	}
+
+	if (state->vlan_enabled) {
+		// updates other fields only based off vlan_ports and add_tag fields.
+		// Note that by default, no ports are in any vlans.
+		correct_vlan_state(state);
+	}
+	// ensure sane defaults?
+	return update_state(state);
+}
+
+static int ip175c_get_ports(struct switch_dev *dev, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int err;
+	int b;
+	int ind;
+	unsigned int ports;
+
+	if (val->port_vlan >= dev->vlans || val->port_vlan < 0)
+		return -EINVAL;
+
+	err = get_state(state);
+	if (err<0)
+		return err;
+
+	ports = state->vlan_ports[val->port_vlan];
+	b = 0;
+	ind = 0;
+	while (b < MAX_PORTS) {
+		if (ports&1) {
+			int istagged = ((state->add_tag >> b) & 1);
+			val->value.ports[ind].id = b;
+			val->value.ports[ind].flags = (istagged << SWITCH_PORT_FLAG_TAGGED);
+			ind++;
+		}
+		b++;
+		ports >>= 1;
+	}
+	val->len = ind;
+
+	return 0;
+}
+
+static int ip175c_set_ports(struct switch_dev *dev, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int i;
+	int err;
+
+	if (val->port_vlan >= dev->vlans || val->port_vlan < 0)
+		return -EINVAL;
+
+	err = get_state(state);
+	if (err < 0)
+		return err;
+
+	state->vlan_ports[val->port_vlan] = 0;
+	for (i = 0; i < val->len; i++) {
+		int bitmask = (1<<val->value.ports[i].id);
+		state->vlan_ports[val->port_vlan] |= bitmask;
+		if (val->value.ports[i].flags & (1<<SWITCH_PORT_FLAG_TAGGED)) {
+			state->add_tag |= bitmask;
+		} else {
+			state->add_tag &= (~bitmask);
+		}
+	}
+	/*
+	// no primary vlan id support in swconfig?
+	// primary vlan will be set to the first non-zero vlan a port is a member of.
+	for (i = 0; i< state->regs->NUM_PORTS; i++) {
+		if (vlan_config->pvid & (1<<i)) {
+			state->ports[i].vlan_tag = nr;
+		}
+	}
+	*/
+
+	correct_vlan_state(state);
+	err = update_state(state);
+
+	return err;
+}
+
+static int ip175c_apply(struct switch_dev *dev)
+{
+	struct ip175c_state *state = dev->priv;
+	int err;
+
+	err = get_flags(state);
+	if (err < 0)
+		return err;
+
+	if (REG_SUPP(state->regs->MII_REGISTER_EN)){
+		int val = getPhy(state, state->regs->MII_REGISTER_EN);
+		if (val < 0) {
+			return val;
+		}
+		val |= (1<<state->regs->MII_REGISTER_EN_BIT);
+		return setPhy(state, state->regs->MII_REGISTER_EN, val);
+	}
+	return 0;
+}
+
+static int ip175c_reset(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int i, err;
+
+	err = get_flags(state);
+	if (err < 0)
+		return err;
+
+	if (REG_SUPP(state->regs->RESET_REG)) {
+		err = setPhy(state, state->regs->RESET_REG, state->regs->RESET_VAL);
+		if (err < 0)
+			return err;
+		err = getPhy(state, state->regs->RESET_REG);
+
+		/* data sheet specifies reset period is 2 msec
+		   (don't see any mention of the 2ms delay in the IP178C spec, only
+		    in IP175C, but it can't hurt.) */
+		mdelay(2);
+	}
+
+	if (REG_SUPP(state->regs->MODE_REG)) {
+		err = setPhy(state, state->regs->MODE_REG, state->regs->RESET_VAL);
+		if (err < 0)
+			return err;
+		err = getPhy(state, state->regs->MODE_REG);
+	}
+
+	/* reset switch ports */
+	for (i = 0; i < 5; i++) {
+		err = state->mii_bus->write(state->mii_bus, i,
+					 MII_BMCR, BMCR_RESET);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+/*! get the current register number */
+static int ip175c_get_tagged(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int err;
+
+	err = get_state(state);
+	if (err < 0)
+		return err;
+
+	if (state->add_tag & (1<<val->port_vlan)) {
+		if (state->remove_tag & (1<<val->port_vlan))
+			val->value.i = 3; // shouldn't ever happen.
+		else
+			val->value.i = 1;
+	} else {
+		if (state->remove_tag & (1<<val->port_vlan))
+			val->value.i = 0;
+		else
+			val->value.i = 2;
+	}
+	return 0;
+}
+
+/*! set a new register address for low level access to registers */
+static int ip175c_set_tagged(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int err;
+
+	err = get_state(state);
+	if (err < 0)
+		return err;
+
+	state->add_tag &= ~(1<<val->port_vlan);
+	state->remove_tag &= ~(1<<val->port_vlan);
+
+	if (val->value.i == 0)
+		state->remove_tag |= (1<<val->port_vlan);
+	if (val->value.i == 1)
+		state->add_tag |= (1<<val->port_vlan);
+
+	SET_PORT_BITS(state, state->add_tag,
+				  state->regs->ADD_TAG_REG, state->regs->ADD_TAG_BIT);
+	SET_PORT_BITS(state, state->remove_tag,
+				  state->regs->REMOVE_TAG_REG, state->regs->REMOVE_TAG_BIT);
+
+	return err;
+}
+
+
+/* low level /proc procedures */
+
+/*! get the current phy address */
+static int ip175c_get_phy(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+
+	val->value.i = state->proc_mii.p;
+	return 0;
+}
+
+/*! set a new phy address for low level access to registers */
+static int ip175c_set_phy(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int new_reg = val->value.i;
+
+	if (new_reg < 0 || new_reg > 31)
+		state->proc_mii.p = (u16)-1;
+	else
+		state->proc_mii.p = (u16)new_reg;
+	return 0;
+}
+
+/*! get the current register number */
+static int ip175c_get_reg(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+
+	val->value.i = state->proc_mii.m;
+	return 0;
+}
+
+/*! set a new register address for low level access to registers */
+static int ip175c_set_reg(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int new_reg = val->value.i;
+
+	if (new_reg < 0 || new_reg > 31)
+		state->proc_mii.m = (u16)-1;
+	else
+		state->proc_mii.m = (u16)new_reg;
+	return 0;
+}
+
+/*! get the register content of state->proc_mii */
+static int ip175c_get_val(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int retval = -EINVAL;
+	if (REG_SUPP(state->proc_mii))
+		retval = getPhy(state, state->proc_mii);
+
+	if (retval < 0) {
+		state->proc_errno = retval;
+		return retval;
+	} else {
+		state->proc_errno = 0;
+		val->value.i = retval;
+		return 0;
+	}
+}
+
+/*! write a value to the register defined by phy/reg above */
+static int ip175c_set_val(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	int myval;
+
+	myval = val->value.i;
+	if (myval <= 0xffff && myval >= 0 && REG_SUPP(state->proc_mii)) {
+		state->proc_errno = setPhy(state, state->proc_mii, (u16)myval);
+	} else {
+		state->proc_errno = -EINVAL;
+	}
+	return state->proc_errno;
+}
+
+/*! get the errno of the last read/write of "val" */
+static int ip175c_get_errno(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	val->value.i = state->proc_errno;
+	return 0;
+}
+
+static int ip175c_read_name(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	struct ip175c_state *state = dev->priv;
+	val->value.s = state->regs->NAME; // just a const pointer, won't be freed by swconfig.
+	return 0;
+}
+
+
+static int ip175c_set_port_speed(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	int nr = val->port_vlan;
+	struct ip175c_state *state = dev->priv;
+	struct phy_device *phy;
+	int ctrl;
+	int autoneg;
+	int speed;
+	if (val->value.i == 100) {
+		speed = 1;
+		autoneg = 0;
+	} else if (val->value.i == 10) {
+		speed = 0;
+		autoneg = 0;
+	} else {
+		autoneg = 1;
+		speed = 1;
+	}
+
+	if (nr == state->regs->CPU_PORT) {
+		return -EINVAL; // can't set speed for cpu port!
+	}
+
+	if (nr >= dev->ports || nr < 0)
+		return -EINVAL;
+	phy = state->ports[nr].phy;
+	if (!phy)
+		return -EINVAL;
+
+	ctrl = phy_read(phy, 0);
+	if (ctrl < 0)
+		return -EIO;
+
+	ctrl &= (~(1<<12));
+	ctrl &= (~(1<<13));
+	ctrl |= (autoneg<<12);
+	ctrl |= (speed<<13);
+
+	return phy_write(phy, 0, ctrl);
+}
+
+static int ip175c_get_port_speed(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	int nr = val->port_vlan;
+	struct ip175c_state *state = dev->priv;
+	struct phy_device *phy;
+	int speed, status;
+
+	if (nr == state->regs->CPU_PORT) {
+		val->value.i = 100;
+		return 0;
+	}
+
+	if (nr >= dev->ports || nr < 0)
+		return -EINVAL;
+	phy = state->ports[nr].phy;
+	if (!phy)
+		return -EINVAL;
+
+	status = phy_read(phy, 1);
+	speed = phy_read(phy, 18);
+	if (status < 0 || speed < 0)
+		return -EIO;
+
+	if (status & 4)
+		val->value.i = ((speed & (1<<11)) ? 100 : 10);
+	else
+		val->value.i = 0;
+
+	return 0;
+}
+
+
+static int ip175c_get_port_status(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
+{
+	int nr = val->port_vlan;
+	struct ip175c_state *state = dev->priv;
+	struct phy_device *phy;
+	int ctrl, speed, status;
+	int len;
+	char *buf = state->buf; // fixed-length at 80.
+
+	if (nr == state->regs->CPU_PORT) {
+		sprintf(buf, "up, 100 Mbps, cpu port");
+		val->value.s = buf;
+		return 0;
+	}
+
+	if (nr >= dev->ports || nr < 0)
+		return -EINVAL;
+	phy = state->ports[nr].phy;
+	if (!phy)
+		return -EINVAL;
+
+	ctrl = phy_read(phy, 0);
+	status = phy_read(phy, 1);
+	speed = phy_read(phy, 18);
+	if (ctrl < 0 || status < 0 || speed < 0)
+		return -EIO;
+
+	if (status & 4)
+		len = sprintf(buf, "up, %d Mbps, %s duplex",
+			((speed & (1<<11)) ? 100 : 10),
+			((speed & (1<<10)) ? "full" : "half"));
+	else
+		len = sprintf(buf, "down");
+
+	if (ctrl & (1<<12)) {
+		len += sprintf(buf+len, ", auto-negotiate");
+		if (!(status & (1<<5)))
+			len += sprintf(buf+len, " (in progress)");
+	} else {
+		len += sprintf(buf+len, ", fixed speed (%d)",
+			((ctrl & (1<<13)) ? 100 : 10));
+	}
+
+	buf[len] = '\0';
+	val->value.s = buf;
+	return 0;
+}
+
+enum Ports {
+	IP175C_PORT_STATUS,
+	IP175C_PORT_LINK,
+	IP175C_PORT_TAGGED,
+};
+
+enum Globals {
+	IP175C_RESET,
+	IP175C_ENABLE_VLAN,
+	IP175C_GET_NAME,
+	IP175C_REGISTER_PHY,
+	IP175C_REGISTER_MII,
+	IP175C_REGISTER_VALUE,
+	IP175C_REGISTER_ERRNO,
+};
+
+static const struct switch_attr ip175c_global[] = {
+	[IP175C_RESET] = {
+		.id = IP175C_RESET,
+		.type = SWITCH_TYPE_NOVAL,
+		.name  = "reset",
+		.get = NULL,
+		.description = "Resets the switch but does not clear vlan configuration",
+		.set = ip175c_reset,
+	},
+	[IP175C_ENABLE_VLAN] = {
+		.id = IP175C_ENABLE_VLAN,
+		.type = SWITCH_TYPE_INT,
+		.name  = "enable_vlan",
+		.description = "Flag to enable or disable VLANs and tagging",
+		.get  = ip175c_get_enable_vlan,
+		.set = ip175c_set_enable_vlan,
+	},
+	[IP175C_GET_NAME] = {
+		.id = IP175C_GET_NAME,
+		.type = SWITCH_TYPE_STRING,
+		.description = "Returns the type of IC+ chip.",
+		.name  = "name",
+		.get  = ip175c_read_name,
+		.set = NULL,
+	},
+	/* jal: added for low level debugging etc. */
+	[IP175C_REGISTER_PHY] = {
+		.id = IP175C_REGISTER_PHY,
+		.type = SWITCH_TYPE_INT,
+		.description = "Direct register access: set phy (0-4, or 29,30,31)",
+		.name  = "phy",
+		.get  = ip175c_get_phy,
+		.set = ip175c_set_phy,
+	},
+	[IP175C_REGISTER_MII] = {
+		.id = IP175C_REGISTER_MII,
+		.type = SWITCH_TYPE_INT,
+		.description = "Direct register access: set mii number (0-31)",
+		.name  = "reg",
+		.get  = ip175c_get_reg,
+		.set = ip175c_set_reg,
+	},
+	[IP175C_REGISTER_VALUE] = {
+		.id = IP175C_REGISTER_VALUE,
+		.type = SWITCH_TYPE_INT,
+		.description = "Direct register access: read/write to register (0-65535)",
+		.name  = "val",
+		.get  = ip175c_get_val,
+		.set = ip175c_set_val,
+	},
+	[IP175C_REGISTER_ERRNO] = {
+		.id = IP175C_REGISTER_ERRNO,
+		.type = SWITCH_TYPE_INT,
+		.description = "Direct register access: returns last read or write error",
+		.name  = "errno",
+		.get  = ip175c_get_errno,
+		.set = NULL,
+	},
+
+};
+
+static const struct switch_attr ip175c_vlan[] = {
+};
+
+static const struct switch_attr ip175c_port[] = {
+	[IP175C_PORT_STATUS] = {
+		.id = IP175C_PORT_STATUS,
+		.type = SWITCH_TYPE_STRING,
+		.description = "Returns Detailed port status",
+		.name  = "status",
+		.get  = ip175c_get_port_status,
+		.set = NULL,
+	},
+	[IP175C_PORT_LINK] = {
+		.id = IP175C_PORT_LINK,
+		.type = SWITCH_TYPE_INT,
+		.description = "Link speed. Can write 0 for auto-negotiate, or 10 or 100",
+		.name  = "link",
+		.get  = ip175c_get_port_speed,
+		.set = ip175c_set_port_speed,
+	},
+	[IP175C_PORT_TAGGED] = {
+		.id = IP175C_PORT_LINK,
+		.type = SWITCH_TYPE_INT,
+		.description = "0 = untag, 1 = add tags, 2 = do not alter (This value is reset if vlans are altered)",
+		.name  = "tagged",
+		.get  = ip175c_get_tagged,
+		.set = ip175c_set_tagged,
+	},
+};
+
+static int ip175c_probe(struct phy_device *pdev)
+{
+	struct ip175c_state *state;
+	struct switch_dev *dev;
+	int err;
+
+	/* we only attach to PHY 0, but use all available PHYs */
+	if (pdev->addr != 0)
+		return -ENODEV;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return -ENOMEM;
+
+	dev = &state->dev;
+	dev->attr_global.attr = ip175c_global;
+	dev->attr_global.n_attr = ARRAY_SIZE(ip175c_global);
+	dev->attr_port.attr = ip175c_port;
+	dev->attr_port.n_attr = ARRAY_SIZE(ip175c_port);
+	dev->attr_vlan.attr = ip175c_vlan;
+	dev->attr_vlan.n_attr = ARRAY_SIZE(ip175c_vlan);
+
+	dev->get_vlan_ports = ip175c_get_ports;
+	dev->set_vlan_ports = ip175c_set_ports;
+	dev->apply_config = ip175c_apply;
+
+	dev->priv = state;
+	pdev->priv = state;
+	state->mii_bus = pdev->bus;
+
+	err = get_model(state);
+	if (err < 0)
+		goto error;
+
+	dev->vlans = MAX_VLANS;
+	dev->cpu_port = state->regs->CPU_PORT;
+	dev->ports = state->regs->NUM_PORTS;
+	dev->name = state->regs->NAME;
+
+	return 0;
+
+error:
+	kfree(state);
+	return err;
+}
+
+static int ip175c_config_init(struct phy_device *pdev)
+{
+	struct ip175c_state *state = pdev->priv;
+	struct net_device *dev = pdev->attached_dev;
+	int err;
+
+	pdev->irq = PHY_IGNORE_INTERRUPT;
+	err = register_switch(&state->dev, dev);
+	if (err < 0)
+		return err;
+
+	ip175c_reset(&state->dev, NULL, NULL);
+
+	state->registered = true;
+	netif_carrier_on(pdev->attached_dev);
+
+	return 0;
+}
+
+static void ip175c_remove(struct phy_device *pdev)
+{
+	struct ip175c_state *state = pdev->priv;
+
+	if (state->registered)
+		unregister_switch(&state->dev);
+	kfree(state);
+}
+
+static int ip175c_config_aneg(struct phy_device *pdev)
+{
+	return 0;
+}
+
+static int ip175c_read_status(struct phy_device *pdev)
+{
+	pdev->speed = SPEED_100;
+	pdev->duplex = DUPLEX_FULL;
+	pdev->pause = pdev->asym_pause = 0;
+	return 0;
+}
+
+static struct phy_driver ip175c_driver = {
+	.name		= "IC+ IP175C",
+	.phy_id		= 0x02430d80,
+	.phy_id_mask	= 0x0ffffff0,
+	.features	= PHY_BASIC_FEATURES,
+	.probe		= ip175c_probe,
+	.remove		= ip175c_remove,
+	.config_init	= ip175c_config_init,
+	.config_aneg	= ip175c_config_aneg,
+	.read_status	= ip175c_read_status,
+	.driver		= { .owner = THIS_MODULE },
+};
+
+
+int __init ip175c_init(void)
+{
+	return phy_driver_register(&ip175c_driver);
+}
+
+void __exit ip175c_exit(void)
+{
+	phy_driver_unregister(&ip175c_driver);
+}
+
+MODULE_AUTHOR("Patrick Horn <patrick.horn@gmail.com>");
+MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
+MODULE_LICENSE("GPL");
+
+module_init(ip175c_init);
+module_exit(ip175c_exit);
+