marvell/linux/drivers/net/phy/ip175d.c

#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>
#include <linux/device.h>
#include "ip175d.h"

#define DRV_NAME	"ip175d"
#define DRV_VERSION	"2.2.0"
#define DRV_RELDATE	"2020-01-02"

#define MAX_VLANS 16
#define MAX_PORTS 9
#undef DUMP_MII_IO

/* Valid for PHY 0-4 */
#define IP175D_REG_ST 			1		/* Status Register */
#define IP175D_REG_ST_ANEG		(1<<5)	/* Autonegotiation: 1=Complete, 0=In Progress */
#define IP175D_REG_ST_LINK		(1<<2)	/* Link Status: 1=Link Pass, 0=Link Fail */

//#define WAN_LAN_AUTO_ADAPT 1

typedef struct ip175d_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))

struct ip175d_state;

/*********** 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.

	// Pointers to functions which manipulate hardware state
	int (*update_state)(struct ip175d_state *state);
	int (*set_vlan_mode)(struct ip175d_state *state);
	int (*reset)(struct ip175d_state *state);
};

static int ip175d_update_state(struct ip175d_state *state);
static int ip175d_set_vlan_mode(struct ip175d_state *state);
static int ip175d_reset(struct ip175d_state *state);


static const struct register_mappings IP175D = {
	.NAME = "IP175D",
	.MODEL_NO = 0x18,

	// The IP175D has a completely different interface, so we leave most
	// of the registers undefined and switch to different code paths.

	.VLAN_DEFAULT_TAG_REG = {
		NOTSUPPORTED,NOTSUPPORTED,NOTSUPPORTED,NOTSUPPORTED,
		NOTSUPPORTED,NOTSUPPORTED,NOTSUPPORTED,NOTSUPPORTED,
	},

	.ADD_TAG_REG = NOTSUPPORTED,
	.REMOVE_TAG_REG = NOTSUPPORTED,

	.SIMPLE_VLAN_REGISTERS = 0,

	.VLAN_LOOKUP_REG = NOTSUPPORTED,
	.VLAN_LOOKUP_REG_5 = NOTSUPPORTED,
	.TAG_VLAN_MASK_REG = NOTSUPPORTED,

	.RESET_VAL = 0x175D,
	.RESET_REG = {20,2},
	.MODE_REG = NOTSUPPORTED,

	.ROUTER_CONTROL_REG = NOTSUPPORTED,
	.ROUTER_EN_BIT = -1,
	.NUMLAN_GROUPS_BIT = -1,

	.VLAN_CONTROL_REG = NOTSUPPORTED,
	.TAG_VLAN_BIT = -1,

	.NUM_PORTS = 6,
	.CPU_PORT = 5,

	.MII_REGISTER_EN = NOTSUPPORTED,

	.update_state = ip175d_update_state,
	.set_vlan_mode = ip175d_set_vlan_mode,
	.reset = ip175d_reset,
};

struct ip175d_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 {
		u16 pvid;
		unsigned int shareports;
	} ports[MAX_PORTS];
	unsigned int add_tag;
	unsigned int remove_tag;
	int num_vlans;
	struct vlan_state {
		unsigned int ports;
		unsigned int tag;	// VLAN tag (IP175D only)
	} vlans[MAX_VLANS];
	const struct register_mappings *regs;
	reg proc_mii; 	// phy/reg for the low level register access via swconfig

	char buf[80];
};

#define get_state(_dev) container_of((_dev), struct ip175d_state, dev)

static int ip_phy_read(struct ip175d_state *state, int port, int reg)
{
	int val = mdiobus_read(state->mii_bus, port, reg);
	if (val < 0)
		pr_warning("IP17xx: Unable to get MII register %d,%d: error %d\n", port, reg, -val);
#ifdef DUMP_MII_IO
	else
		pr_debug("IP17xx: Read MII(%d,%d) -> %04x\n", port, reg, val);
#endif
	return val;
}

static int ip_phy_write(struct ip175d_state *state, int port, int reg, u16 val)
{
	int err;

#ifdef DUMP_MII_IO
	pr_debug("IP17xx: Write MII(%d,%d) <- %04x\n", port, reg, val);
#endif
	err = mdiobus_write(state->mii_bus, port, reg, val);
	if (err < 0)
		pr_warning("IP17xx: Unable to write MII register %d,%d: error %d\n", port, reg, -err);
	return err;
}

static int ip_phy_write_masked(struct ip175d_state *state, int port, int reg, unsigned int mask, unsigned int data)
{
	int val = ip_phy_read(state, port, reg);
	if (val < 0)
		return 0;
	return ip_phy_write(state, port, reg, (val & ~mask) | data);
}

static int getPhy(struct ip175d_state *state, reg mii)
{
	if (!REG_SUPP(mii))
		return -EFAULT;
	return ip_phy_read(state, mii.p, mii.m);
}

static int setPhy(struct ip175d_state *state, reg mii, u16 value)
{
	int err;

	if (!REG_SUPP(mii))
		return -EFAULT;
	err = ip_phy_write(state, mii.p, mii.m, value);
	if (err < 0)
		return err;
	mdelay(2);
	getPhy(state, mii);
	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 ip175d_state *state)
{
	int id1, id2;
	int oui_id, model_no, rev_no, chip_no;

	id1 = ip_phy_read(state, 0, 2);
	id2 = ip_phy_read(state, 0, 3);
	oui_id = (id1 << 6) | ((id2 >> 10) & 0x3f);
	model_no = (id2 >> 4) & 0x3f;
	rev_no = id2 & 0xf;
	printk("IP17xx: Identified oui=%06x model=%02x rev=%X\n", oui_id, model_no, rev_no);

	if (oui_id != 0x0090c3)  // No other oui_id should have reached us anyway
		return -ENODEV;

	if (model_no == IP175D.MODEL_NO) {
		chip_no = ip_phy_read(state, 20, 0);
		printk("IP17xx: Chip ID register reads %04x\n", chip_no);
		if (chip_no == 0x175d)
			state->regs = &IP175D;
	} else {
		printk("IP17xx: Found an unknown IC+ switch with model number %02x, revision %X.\n", model_no, rev_no);
		return -EPERM;
	}

	return 0;
}

/*** Low-level functions for IP175D ***/

static int ip175d_update_state(struct ip175d_state *state)
{
	unsigned int filter_mask = 0;
	unsigned int ports[16], add[16], rem[16];
	int i, j;
	int err = 0;

	for (i = 0; i < 16; i++) {
		ports[i] = 0;
		add[i] = 0;
		rem[i] = 0;
		if (!state->vlan_enabled) {
			err |= ip_phy_write(state, 22, 14+i, i+1);	// default tags
			ports[i] = 0x3f;
			continue;
		}
		if (!state->vlans[i].tag) {
			// Reset the filter
			err |= ip_phy_write(state, 22, 14+i, 0);	// tag
			continue;
		}
		filter_mask |= 1 << i;
		err |= ip_phy_write(state, 22, 14+i, state->vlans[i].tag);
		ports[i] = state->vlans[i].ports;
		for (j = 0; j < 6; j++) {
			if (ports[i] & (1 << j)) {
				if (state->add_tag & (1 << j))
					add[i] |= 1 << j;
				if (state->remove_tag & (1 << j))
					rem[i] |= 1 << j;
			}
		}
	}

	// Port masks, tag adds and removals
	for (i = 0; i < 8; i++) {
		err |= ip_phy_write(state, 23, i, ports[2*i] | (ports[2*i+1] << 8));
		err |= ip_phy_write(state, 23, 8+i, add[2*i] | (add[2*i+1] << 8));
		err |= ip_phy_write(state, 23, 16+i, rem[2*i] | (rem[2*i+1] << 8));
	}
	err |= ip_phy_write(state, 22, 10, filter_mask);

	// Default VLAN tag for each port
	for (i = 0; i < 6; i++)
		err |= ip_phy_write(state, 22, 4+i, state->vlans[state->ports[i].pvid].tag);

	return (err ? -EIO : 0);
}

static int ip175d_set_vlan_mode(struct ip175d_state *state)
{
	int i;
	int err = 0;

	if (state->vlan_enabled) {
		// VLAN classification rules: tag-based VLANs, use VID to classify,
		// drop packets that cannot be classified.
		err |= ip_phy_write_masked(state, 22, 0, 0x3fff, 0x003f);

		// Ingress rules: CFI=1 dropped, null VID is untagged, VID=1 passed,
		// VID=0xfff discarded, admin both tagged and untagged, ingress
		// filters enabled.
		err |= ip_phy_write_masked(state, 22, 1, 0x0fff, 0x0c3f);

		// Egress rules: IGMP processing off, keep VLAN header off
		err |= ip_phy_write_masked(state, 22, 2, 0x0fff, 0x0000);
	} else {
		// VLAN classification rules: everything off & clear table
		err |= ip_phy_write_masked(state, 22, 0, 0xbfff, 0x8000);

		// Ingress and egress rules: set to defaults
		err |= ip_phy_write_masked(state, 22, 1, 0x0fff, 0x0c3f);
		err |= ip_phy_write_masked(state, 22, 2, 0x0fff, 0x0000);
	}

	// Reset default VLAN for each port to 0
	for (i = 0; i < 6; i++)
		state->ports[i].pvid = 0;

	err |= ip175d_update_state(state);

	return (err ? -EIO : 0);
}

static int ip175d_reset(struct ip175d_state *state)
{
	int err = 0;
#ifdef WAN_LAN_AUTO_ADAPT
	// Enable the special tagging mode for RX
	err |= ip_phy_write(state, 21, 22, ip_phy_read(state, 21, 22) | 0x1);
#else
	// Disable the special tagging mode
	err |= ip_phy_write_masked(state, 21, 22, 0x0003, 0x0000);
#endif
	// Set 802.1q protocol type
	err |= ip_phy_write(state, 22, 3, 0x8100);

	state->vlan_enabled = 0;
	err |= ip175d_set_vlan_mode(state);

	return (err ? -EIO : 0);
}

/*** High-level functions ***/

static int ip175d_get_enable_vlan(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);

	val->value.i = state->vlan_enabled;
	return 0;
}

static void ip175d_reset_vlan_config(struct ip175d_state *state)
{
	int i;

	state->remove_tag = (state->vlan_enabled ? ((1<<state->regs->NUM_PORTS)-1) : 0x0000);
	state->add_tag = 0x0000;
	for (i = 0; i < MAX_VLANS; i++) {
		state->vlans[i].ports = 0x0000;
		state->vlans[i].tag = (i ? i : 16);
	}
	for (i = 0; i < MAX_PORTS; i++)
		state->ports[i].pvid = 0;
}

static int ip175d_set_enable_vlan(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int enable;

	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.
	ip175d_reset_vlan_config(state);

	return state->regs->set_vlan_mode(state);
}

static int ip175d_get_ports(struct switch_dev *dev, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int b;
	int ind;
	unsigned int ports;

	if (val->port_vlan >= dev->vlans || val->port_vlan < 0)
		return -EINVAL;

	ports = state->vlans[val->port_vlan].ports;
	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 ip175d_set_ports(struct switch_dev *dev, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int i;

	if (val->port_vlan >= dev->vlans || val->port_vlan < 0)
		return -EINVAL;

	state->vlans[val->port_vlan].ports = 0;
	for (i = 0; i < val->len; i++) {
		unsigned int bitmask = (1<<val->value.ports[i].id);
		state->vlans[val->port_vlan].ports |= bitmask;
		if (val->value.ports[i].flags & (1<<SWITCH_PORT_FLAG_TAGGED)) {
			state->add_tag |= bitmask;
			state->remove_tag &= (~bitmask);
		} else {
			state->add_tag &= (~bitmask);
			state->remove_tag |= bitmask;
		}
	}

	return state->regs->update_state(state);
}

static int ip175d_apply(struct switch_dev *dev)
{
	struct ip175d_state *state = get_state(dev);

	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 ip175d_switch_reset(struct switch_dev *dev)
{
	struct ip175d_state *state = get_state(dev);
	int i, 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 to be 2 msec.
		 *  (I don't see any mention of the 2ms delay in the IP178C spec, only
		 *  in IP175C, but it can't hurt.)
		 */
		mdelay(2);
	}

	/* reset switch ports */
	for (i = 0; i < state->regs->NUM_PORTS-1; i++) {
		err = ip_phy_write(state, i, MII_BMCR, BMCR_RESET);
		if (err < 0)
			return err;
	}

	state->router_mode = 0;
	state->vlan_enabled = 0;
	ip175d_reset_vlan_config(state);

	return state->regs->reset(state);
}

static int ip175d_get_tagged(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);

	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;
}

static int ip175d_set_tagged(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);

	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);

	return state->regs->update_state(state);
}

/** Get the current phy address */
static int ip175d_get_phy(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);

	val->value.i = state->proc_mii.p;
	return 0;
}

/** Set a new phy address for low level access to registers */
static int ip175d_set_phy(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	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 ip175d_get_reg(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);

	val->value.i = state->proc_mii.m;
	return 0;
}

/** Set a new register address for low level access to registers */
static int ip175d_set_reg(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	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 ip175d_get_val(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int retval = -EINVAL;
	if (REG_SUPP(state->proc_mii))
		retval = getPhy(state, state->proc_mii);

	if (retval < 0) {
		return retval;
	} else {
		val->value.i = retval;
		return 0;
	}
}

/** Write a value to the register defined by phy/reg above */
static int ip175d_set_val(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int myval, err = -EINVAL;

	myval = val->value.i;
	if (myval <= 0xffff && myval >= 0 && REG_SUPP(state->proc_mii)) {
		err = setPhy(state, state->proc_mii, (u16)myval);
	}
	return err;
}

/** Get the register phy 21 MII 22 Special tagging */
static int ip175d_get_spec_tag(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);

	val->value.i = ip_phy_read(state, 21, 22);
	return 0;
}

/** Write a value to the register dphy 21 MII 22 Special tagging */
static int ip175d_set_spec_tag(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int myval, err = -EINVAL;

	myval = val->value.i;

	/* set Special tagging for Tx and Rx */
	err = ip_phy_write(state, 21, 22, myval);

	return err;
}

static int ip175d_read_name(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	val->value.s = state->regs->NAME; // Just a const pointer, won't be freed by swconfig.
	return 0;
}

static int ip175d_get_tag(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int vlan = val->port_vlan;

	if (vlan < 0 || vlan >= MAX_VLANS)
		return -EINVAL;

	val->value.i = state->vlans[vlan].tag;
	return 0;
}

static int ip175d_set_tag(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int vlan = val->port_vlan;
	int tag = val->value.i;

	if (vlan < 0 || vlan >= MAX_VLANS)
		return -EINVAL;

	if (tag < 0 || tag > 4095)
		return -EINVAL;

	state->vlans[vlan].tag = tag;
	return state->regs->update_state(state);
}

static int ip175d_set_port_speed(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int nr = val->port_vlan;
	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;
	}

	/* Can't set speed for cpu port */
	if (nr == state->regs->CPU_PORT)
		return -EINVAL;

	if (nr >= dev->ports || nr < 0)
		return -EINVAL;

	ctrl = ip_phy_read(state, nr, 0);
	if (ctrl < 0)
		return -EIO;

	ctrl &= (~(1<<12));
	ctrl &= (~(1<<13));
	ctrl |= (autoneg<<12);
	ctrl |= (speed<<13);

	return ip_phy_write(state, nr, 0, ctrl);
}

static int ip175d_get_port_speed(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int nr = val->port_vlan;
	int speed, status;

	if (nr == state->regs->CPU_PORT) {
		val->value.i = 100;
		return 0;
	}

	if (nr >= dev->ports || nr < 0)
		return -EINVAL;

	status = ip_phy_read(state, nr, 1);
	speed = ip_phy_read(state, nr, 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 ip175d_get_port_status(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
	struct ip175d_state *state = get_state(dev);
	int ctrl, speed, status;
	int nr = val->port_vlan;
	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;

	ctrl = ip_phy_read(state, nr, 0);
	status = ip_phy_read(state, nr, 1);
	speed = ip_phy_read(state, nr, 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;
}

static int ip175d_get_pvid(struct switch_dev *dev, int port, int *val)
{
	struct ip175d_state *state = get_state(dev);

	*val = state->ports[port].pvid;
	return 0;
}

static int ip175d_set_pvid(struct switch_dev *dev, int port, int val)
{
	struct ip175d_state *state = get_state(dev);

	if (val < 0 || val >= MAX_VLANS)
		return -EINVAL;

	state->ports[port].pvid = val;
	return state->regs->update_state(state);
}


enum Ports {
	IP17XX_PORT_STATUS,
	IP17XX_PORT_LINK,
	IP17XX_PORT_TAGGED,
	IP17XX_PORT_PVID,
};

enum Globals {
	IP17XX_ENABLE_VLAN,
	IP17XX_GET_NAME,
	IP17XX_REGISTER_PHY,
	IP17XX_REGISTER_MII,
	IP17XX_REGISTER_VALUE,
	IP17XX_REGISTER_SPEC_TAG,
	IP17XX_REGISTER_ERRNO,
};

enum Vlans {
	IP17XX_VLAN_TAG,
};

static const struct switch_attr ip175d_global[] = {
	[IP17XX_ENABLE_VLAN] = {
		.id = IP17XX_ENABLE_VLAN,
		.type = SWITCH_TYPE_INT,
		.name  = "enable_vlan",
		.description = "Flag to enable or disable VLANs and tagging",
		.get  = ip175d_get_enable_vlan,
		.set = ip175d_set_enable_vlan,
	},
	[IP17XX_GET_NAME] = {
		.id = IP17XX_GET_NAME,
		.type = SWITCH_TYPE_STRING,
		.description = "Returns the type of IC+ chip.",
		.name  = "name",
		.get  = ip175d_read_name,
		.set = NULL,
	},
	/* jal: added for low level debugging etc. */
	[IP17XX_REGISTER_PHY] = {
		.id = IP17XX_REGISTER_PHY,
		.type = SWITCH_TYPE_INT,
		.description = "Direct register access: set PHY (0-4, or 29,30,31)",
		.name  = "phy",
		.get  = ip175d_get_phy,
		.set = ip175d_set_phy,
	},
	[IP17XX_REGISTER_MII] = {
		.id = IP17XX_REGISTER_MII,
		.type = SWITCH_TYPE_INT,
		.description = "Direct register access: set MII register number (0-31)",
		.name  = "reg",
		.get  = ip175d_get_reg,
		.set = ip175d_set_reg,
	},
	[IP17XX_REGISTER_VALUE] = {
		.id = IP17XX_REGISTER_VALUE,
		.type = SWITCH_TYPE_INT,
		.description = "Direct register access: read/write to register (0-65535)",
		.name  = "val",
		.get  = ip175d_get_val,
		.set = ip175d_set_val,
	},
	[IP17XX_REGISTER_SPEC_TAG] = {
		.id = IP17XX_REGISTER_SPEC_TAG,
		.type = SWITCH_TYPE_INT,
		.description = "Direct register access: read/write to phy 21 MII 22 Special tagging",
		.name  = "spec",
		.get  = ip175d_get_spec_tag,
		.set = ip175d_set_spec_tag,
	},
};

static const struct switch_attr ip175d_vlan[] = {
	[IP17XX_VLAN_TAG] = {
		.id = IP17XX_VLAN_TAG,
		.type = SWITCH_TYPE_INT,
		.description = "VLAN ID (0-4095) [IP175D only]",
		.name = "vid",
		.get = ip175d_get_tag,
		.set = ip175d_set_tag,
	}
};

static const struct switch_attr ip175d_port[] = {
	[IP17XX_PORT_STATUS] = {
		.id = IP17XX_PORT_STATUS,
		.type = SWITCH_TYPE_STRING,
		.description = "Returns Detailed port status",
		.name  = "status",
		.get  = ip175d_get_port_status,
		.set = NULL,
	},
	[IP17XX_PORT_LINK] = {
		.id = IP17XX_PORT_LINK,
		.type = SWITCH_TYPE_INT,
		.description = "Link speed. Can write 0 for auto-negotiate, or 10 or 100",
		.name  = "link",
		.get  = ip175d_get_port_speed,
		.set = ip175d_set_port_speed,
	},
	[IP17XX_PORT_TAGGED] = {
		.id = IP17XX_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  = ip175d_get_tagged,
		.set = ip175d_set_tagged,
	},
};

static const struct switch_dev_ops ip175d_ops = {
	.attr_global = {
		.attr = ip175d_global,
		.n_attr = ARRAY_SIZE(ip175d_global),
	},
	.attr_port = {
		.attr = ip175d_port,
		.n_attr = ARRAY_SIZE(ip175d_port),
	},
	.attr_vlan = {
		.attr = ip175d_vlan,
		.n_attr = ARRAY_SIZE(ip175d_vlan),
	},

	.get_port_pvid = ip175d_get_pvid,
	.set_port_pvid = ip175d_set_pvid,
	.get_vlan_ports = ip175d_get_ports,
	.set_vlan_ports = ip175d_set_ports,
	.apply_config = ip175d_apply,
	.reset_switch = ip175d_switch_reset,
};

static int ip175d_probe(struct phy_device *pdev)
{
	struct ip175d_state *state;
	struct switch_dev *dev;
	int err;

	state = kzalloc(sizeof(*state), GFP_KERNEL);
	if (!state)
		return -ENOMEM;

	dev = &state->dev;

	pdev->priv = state;
	state->mii_bus = pdev->mdio.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;
	dev->ops = &ip175d_ops;

	pdev->state = PHY_READY;
	printk("IP17xx: Found %s at %s\n", dev->name, dev_name(&pdev->mdio.dev));
	return 0;

error:
	kfree(state);
	return err;
}

static int ip175d_config_init(struct phy_device *pdev)
{
	struct ip175d_state *state = pdev->priv;
	struct net_device *dev = pdev->attached_dev;
	int err;

	if (!state->registered) {
		err = register_switch(&state->dev, dev);
		if (err < 0)
			return err;
		state->registered = true;
	}

	ip175d_switch_reset(&state->dev);
	return 0;
}

static void ip175d_remove(struct phy_device *pdev)
{
	struct ip175d_state *state = pdev->priv;

	if (state->registered)
		unregister_switch(&state->dev);
	kfree(state);
}

static int ip175d_config_aneg(struct phy_device *pdev)
{
	return 0;
}

static int ip175d_aneg_done(struct phy_device *pdev)
{
	int aneg = 0;
	int addr;

	for(addr = 0; addr <= 4; addr++)
	{
		int phy_status = mdiobus_read(pdev->mdio.bus,addr,IP175D_REG_ST);
		if(phy_status & IP175D_REG_ST_ANEG)
		{
			aneg = BMSR_ANEGCOMPLETE;
		}
	}
	return aneg;
}

static int ip175d_read_status(struct phy_device *pdev)
{
	int addr;
	int link = 0;

	for(addr = 0; addr < MAX_PORT_NUM-1; addr++)
	{
		int phy_status = mdiobus_read(pdev->mdio.bus,addr,IP175D_REG_ST);
		if(phy_status & IP175D_REG_ST_LINK)
			link |= 1 << addr;
	}

	pdev->link = link;

	if(link)
	{
		pdev->speed = SPEED_100;
		pdev->duplex = DUPLEX_FULL;
		pdev->pause = 0;
		pdev->asym_pause = 0;
	}
	return 0;

}

static struct phy_driver ip175d_driver[] = {
	{
		.name		= "IC+ IP175D",
		.phy_id		= 0x02430d80,
		.phy_id_mask	= 0x0ffffff0,
		.features	= PHY_BASIC_FEATURES,
		.probe		= ip175d_probe,
		.remove		= ip175d_remove,
		.config_init	= ip175d_config_init,
		.config_aneg	= ip175d_config_aneg,
		.aneg_done	= ip175d_aneg_done,
		.read_status	= ip175d_read_status,
		.suspend	= genphy_suspend,
		.resume		= genphy_resume,
	}
};

module_phy_driver(ip175d_driver);
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL");