[deliverable/linux.git] / drivers / net / phy / swphy.c

/*
 * Software PHY emulation
 *
 * Code taken from fixed_phy.c by Russell King <rmk+kernel@arm.linux.org.uk>
 *
 * Author: Vitaly Bordug <vbordug@ru.mvista.com>
 *         Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * Copyright (c) 2006-2007 MontaVista Software, Inc.
 *
 * 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.
 */
#include <linux/export.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>

#include "swphy.h"

struct swmii_regs {
	u16 bmcr;
	u16 bmsr;
	u16 lpa;
	u16 lpagb;
};

enum {
	SWMII_SPEED_10 = 0,
	SWMII_SPEED_100,
	SWMII_SPEED_1000,
	SWMII_DUPLEX_HALF = 0,
	SWMII_DUPLEX_FULL,
};

/*
 * These two tables get bitwise-anded together to produce the final result.
 * This means the speed table must contain both duplex settings, and the
 * duplex table must contain all speed settings.
 */
static const struct swmii_regs speed[] = {
	[SWMII_SPEED_10] = {
		.bmcr  = BMCR_FULLDPLX,
		.lpa   = LPA_10FULL | LPA_10HALF,
	},
	[SWMII_SPEED_100] = {
		.bmcr  = BMCR_FULLDPLX | BMCR_SPEED100,
		.bmsr  = BMSR_100FULL | BMSR_100HALF,
		.lpa   = LPA_100FULL | LPA_100HALF,
	},
	[SWMII_SPEED_1000] = {
		.bmcr  = BMCR_FULLDPLX | BMCR_SPEED1000,
		.bmsr  = BMSR_ESTATEN,
		.lpagb = LPA_1000FULL | LPA_1000HALF,
	},
};

static const struct swmii_regs duplex[] = {
	[SWMII_DUPLEX_HALF] = {
		.bmcr  = ~BMCR_FULLDPLX,
		.bmsr  = BMSR_ESTATEN | BMSR_100HALF,
		.lpa   = LPA_10HALF | LPA_100HALF,
		.lpagb = LPA_1000HALF,
	},
	[SWMII_DUPLEX_FULL] = {
		.bmcr  = ~0,
		.bmsr  = BMSR_ESTATEN | BMSR_100FULL,
		.lpa   = LPA_10FULL | LPA_100FULL,
		.lpagb = LPA_1000FULL,
	},
};

static int swphy_decode_speed(int speed)
{
	switch (speed) {
	case 1000:
		return SWMII_SPEED_1000;
	case 100:
		return SWMII_SPEED_100;
	case 10:
		return SWMII_SPEED_10;
	default:
		return -EINVAL;
	}
}

/**
 * swphy_validate_state - validate the software phy status
 * @state: software phy status
 *
 * This checks that we can represent the state stored in @state can be
 * represented in the emulated MII registers.  Returns 0 if it can,
 * otherwise returns -EINVAL.
 */
int swphy_validate_state(const struct fixed_phy_status *state)
{
	int err;

	if (state->link) {
		err = swphy_decode_speed(state->speed);
		if (err < 0) {
			pr_warn("swphy: unknown speed\n");
			return -EINVAL;
		}
	}
	return 0;
}
EXPORT_SYMBOL_GPL(swphy_validate_state);

/**
 * swphy_update_regs - update MII register array with fixed phy state
 * @regs: array of 32 registers to update
 * @state: fixed phy status
 *
 * Update the array of MII registers with the fixed phy link, speed,
 * duplex and pause mode settings.
 */
void swphy_update_regs(u16 *regs, const struct fixed_phy_status *state)
{
	int speed_index, duplex_index;
	u16 bmsr = BMSR_ANEGCAPABLE;
	u16 bmcr = 0;
	u16 lpagb = 0;
	u16 lpa = 0;

	speed_index = swphy_decode_speed(state->speed);
	if (WARN_ON(speed_index < 0))
		return;

	duplex_index = state->duplex ? SWMII_DUPLEX_FULL : SWMII_DUPLEX_HALF;

	bmsr |= speed[speed_index].bmsr & duplex[duplex_index].bmsr;

	if (state->link) {
		bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;

		bmcr  |= speed[speed_index].bmcr  & duplex[duplex_index].bmcr;
		lpa   |= speed[speed_index].lpa   & duplex[duplex_index].lpa;
		lpagb |= speed[speed_index].lpagb & duplex[duplex_index].lpagb;

		if (state->pause)
			lpa |= LPA_PAUSE_CAP;

		if (state->asym_pause)
			lpa |= LPA_PAUSE_ASYM;
	}

	regs[MII_PHYSID1] = 0;
	regs[MII_PHYSID2] = 0;

	regs[MII_BMSR] = bmsr;
	regs[MII_BMCR] = bmcr;
	regs[MII_LPA] = lpa;
	regs[MII_STAT1000] = lpagb;
}
EXPORT_SYMBOL_GPL(swphy_update_regs);
Commit	Line	Data
5ae68b0c RK	1	/*
	2	* Software PHY emulation
	3	*
	4	* Code taken from fixed_phy.c by Russell King <rmk+kernel@arm.linux.org.uk>
	5	*
	6	* Author: Vitaly Bordug <vbordug@ru.mvista.com>
	7	* Anton Vorontsov <avorontsov@ru.mvista.com>
	8	*
	9	* Copyright (c) 2006-2007 MontaVista Software, Inc.
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
	15	*/
	16	#include <linux/export.h>
	17	#include <linux/mii.h>
	18	#include <linux/phy.h>
	19	#include <linux/phy_fixed.h>
	20
	21	#include "swphy.h"
	22
0629bf17 RK	23	struct swmii_regs {
	24	u16 bmcr;
	25	u16 bmsr;
	26	u16 lpa;
	27	u16 lpagb;
	28	};
	29
	30	enum {
	31	SWMII_SPEED_10 = 0,
	32	SWMII_SPEED_100,
	33	SWMII_SPEED_1000,
	34	SWMII_DUPLEX_HALF = 0,
	35	SWMII_DUPLEX_FULL,
	36	};
	37
	38	/*
	39	* These two tables get bitwise-anded together to produce the final result.
	40	* This means the speed table must contain both duplex settings, and the
	41	* duplex table must contain all speed settings.
	42	*/
	43	static const struct swmii_regs speed[] = {
	44	[SWMII_SPEED_10] = {
	45	.bmcr = BMCR_FULLDPLX,
	46	.lpa = LPA_10FULL \| LPA_10HALF,
	47	},
	48	[SWMII_SPEED_100] = {
	49	.bmcr = BMCR_FULLDPLX \| BMCR_SPEED100,
	50	.bmsr = BMSR_100FULL \| BMSR_100HALF,
	51	.lpa = LPA_100FULL \| LPA_100HALF,
	52	},
	53	[SWMII_SPEED_1000] = {
	54	.bmcr = BMCR_FULLDPLX \| BMCR_SPEED1000,
	55	.bmsr = BMSR_ESTATEN,
	56	.lpagb = LPA_1000FULL \| LPA_1000HALF,
	57	},
	58	};
	59
	60	static const struct swmii_regs duplex[] = {
	61	[SWMII_DUPLEX_HALF] = {
	62	.bmcr = ~BMCR_FULLDPLX,
	63	.bmsr = BMSR_ESTATEN \| BMSR_100HALF,
	64	.lpa = LPA_10HALF \| LPA_100HALF,
	65	.lpagb = LPA_1000HALF,
	66	},
	67	[SWMII_DUPLEX_FULL] = {
	68	.bmcr = ~0,
	69	.bmsr = BMSR_ESTATEN \| BMSR_100FULL,
	70	.lpa = LPA_10FULL \| LPA_100FULL,
	71	.lpagb = LPA_1000FULL,
	72	},
	73	};
	74
	75	static int swphy_decode_speed(int speed)
	76	{
	77	switch (speed) {
	78	case 1000:
	79	return SWMII_SPEED_1000;
	80	case 100:
	81	return SWMII_SPEED_100;
	82	case 10:
	83	return SWMII_SPEED_10;
	84	default:
	85	return -EINVAL;
	86	}
87	}
88
68888ce0 RK	89	/**
	90	* swphy_validate_state - validate the software phy status
	91	* @state: software phy status
	92	*
	93	* This checks that we can represent the state stored in @state can be
	94	* represented in the emulated MII registers. Returns 0 if it can,
	95	* otherwise returns -EINVAL.
	96	*/
	97	int swphy_validate_state(const struct fixed_phy_status *state)
	98	{
	99	int err;
	100
	101	if (state->link) {
	102	err = swphy_decode_speed(state->speed);
	103	if (err < 0) {
	104	pr_warn("swphy: unknown speed\n");
	105	return -EINVAL;
	106	}
	107	}
	108	return 0;
	109	}
	110	EXPORT_SYMBOL_GPL(swphy_validate_state);
	111
5ae68b0c RK	112	/**
	113	* swphy_update_regs - update MII register array with fixed phy state
	114	* @regs: array of 32 registers to update
	115	* @state: fixed phy status
	116	*
	117	* Update the array of MII registers with the fixed phy link, speed,
	118	* duplex and pause mode settings.
	119	*/
68888ce0	120	void swphy_update_regs(u16 regs, const struct fixed_phy_status state)
5ae68b0c	121	{
0629bf17	122	int speed_index, duplex_index;
5ae68b0c RK	123	u16 bmsr = BMSR_ANEGCAPABLE;
	124	u16 bmcr = 0;
	125	u16 lpagb = 0;
	126	u16 lpa = 0;
	127
0629bf17	128	speed_index = swphy_decode_speed(state->speed);
68888ce0 RK	129	if (WARN_ON(speed_index < 0))
68888ce0 RK	130	return;
5ae68b0c	131
0629bf17 RK	132	duplex_index = state->duplex ? SWMII_DUPLEX_FULL : SWMII_DUPLEX_HALF;
	133
	134	bmsr \|= speed[speed_index].bmsr & duplex[duplex_index].bmsr;
	135
5ae68b0c RK	136	if (state->link) {
	137	bmsr \|= BMSR_LSTATUS \| BMSR_ANEGCOMPLETE;
	138
0629bf17 RK	139	bmcr \|= speed[speed_index].bmcr & duplex[duplex_index].bmcr;
	140	lpa \|= speed[speed_index].lpa & duplex[duplex_index].lpa;
	141	lpagb \|= speed[speed_index].lpagb & duplex[duplex_index].lpagb;
5ae68b0c RK	142
	143	if (state->pause)
	144	lpa \|= LPA_PAUSE_CAP;
	145
	146	if (state->asym_pause)
	147	lpa \|= LPA_PAUSE_ASYM;
	148	}
	149
	150	regs[MII_PHYSID1] = 0;
	151	regs[MII_PHYSID2] = 0;
	152
	153	regs[MII_BMSR] = bmsr;
	154	regs[MII_BMCR] = bmcr;
	155	regs[MII_LPA] = lpa;
	156	regs[MII_STAT1000] = lpagb;
5ae68b0c RK	157	}
5ae68b0c RK	158	EXPORT_SYMBOL_GPL(swphy_update_regs);