path: root/drivers/net/phy/mxl-gpy.c

// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2021 Maxlinear Corporation
 * Copyright (C) 2020 Intel Corporation
 *
 * Drivers for Maxlinear Ethernet GPY
 *
 */

#include <linux/module.h>
#include <linux/bitfield.h>
#include <linux/hwmon.h>
#include <linux/mutex.h>
#include <linux/phy.h>
#include <linux/polynomial.h>
#include <linux/property.h>
#include <linux/netdevice.h>

/* PHY ID */
#define PHY_ID_GPYx15B_MASK	0xFFFFFFFC
#define PHY_ID_GPY21xB_MASK	0xFFFFFFF9
#define PHY_ID_GPY2xx		0x67C9DC00
#define PHY_ID_GPY115B		0x67C9DF00
#define PHY_ID_GPY115C		0x67C9DF10
#define PHY_ID_GPY211B		0x67C9DE08
#define PHY_ID_GPY211C		0x67C9DE10
#define PHY_ID_GPY212B		0x67C9DE09
#define PHY_ID_GPY212C		0x67C9DE20
#define PHY_ID_GPY215B		0x67C9DF04
#define PHY_ID_GPY215C		0x67C9DF20
#define PHY_ID_GPY241B		0x67C9DE40
#define PHY_ID_GPY241BM		0x67C9DE80
#define PHY_ID_GPY245B		0x67C9DEC0

#define PHY_CTL1		0x13
#define PHY_CTL1_MDICD		BIT(3)
#define PHY_CTL1_MDIAB		BIT(2)
#define PHY_CTL1_AMDIX		BIT(0)
#define PHY_MIISTAT		0x18	/* MII state */
#define PHY_IMASK		0x19	/* interrupt mask */
#define PHY_ISTAT		0x1A	/* interrupt status */
#define PHY_LED			0x1B	/* LEDs */
#define PHY_FWV			0x1E	/* firmware version */

#define PHY_MIISTAT_SPD_MASK	GENMASK(2, 0)
#define PHY_MIISTAT_DPX		BIT(3)
#define PHY_MIISTAT_LS		BIT(10)

#define PHY_MIISTAT_SPD_10	0
#define PHY_MIISTAT_SPD_100	1
#define PHY_MIISTAT_SPD_1000	2
#define PHY_MIISTAT_SPD_2500	4

#define PHY_IMASK_WOL		BIT(15)	/* Wake-on-LAN */
#define PHY_IMASK_ANC		BIT(10)	/* Auto-Neg complete */
#define PHY_IMASK_ADSC		BIT(5)	/* Link auto-downspeed detect */
#define PHY_IMASK_DXMC		BIT(2)	/* Duplex mode change */
#define PHY_IMASK_LSPC		BIT(1)	/* Link speed change */
#define PHY_IMASK_LSTC		BIT(0)	/* Link state change */
#define PHY_IMASK_MASK		(PHY_IMASK_LSTC | \
				 PHY_IMASK_LSPC | \
				 PHY_IMASK_DXMC | \
				 PHY_IMASK_ADSC | \
				 PHY_IMASK_ANC)

#define GPY_MAX_LEDS		4
#define PHY_LED_POLARITY(idx)	BIT(12 + (idx))
#define PHY_LED_HWCONTROL(idx)	BIT(8 + (idx))
#define PHY_LED_ON(idx)		BIT(idx)

#define PHY_FWV_REL_MASK	BIT(15)
#define PHY_FWV_MAJOR_MASK	GENMASK(11, 8)
#define PHY_FWV_MINOR_MASK	GENMASK(7, 0)

#define PHY_PMA_MGBT_POLARITY	0x82
#define PHY_MDI_MDI_X_MASK	GENMASK(1, 0)
#define PHY_MDI_MDI_X_NORMAL	0x3
#define PHY_MDI_MDI_X_AB	0x2
#define PHY_MDI_MDI_X_CD	0x1
#define PHY_MDI_MDI_X_CROSS	0x0

/* LED */
#define VSPEC1_LED(idx)		(1 + (idx))
#define VSPEC1_LED_BLINKS	GENMASK(15, 12)
#define VSPEC1_LED_PULSE	GENMASK(11, 8)
#define VSPEC1_LED_CON		GENMASK(7, 4)
#define VSPEC1_LED_BLINKF	GENMASK(3, 0)

#define VSPEC1_LED_LINK10	BIT(0)
#define VSPEC1_LED_LINK100	BIT(1)
#define VSPEC1_LED_LINK1000	BIT(2)
#define VSPEC1_LED_LINK2500	BIT(3)

#define VSPEC1_LED_TXACT	BIT(0)
#define VSPEC1_LED_RXACT	BIT(1)
#define VSPEC1_LED_COL		BIT(2)
#define VSPEC1_LED_NO_CON	BIT(3)

/* SGMII */
#define VSPEC1_SGMII_CTRL	0x08
#define VSPEC1_SGMII_CTRL_ANEN	BIT(12)		/* Aneg enable */
#define VSPEC1_SGMII_CTRL_ANRS	BIT(9)		/* Restart Aneg */
#define VSPEC1_SGMII_ANEN_ANRS	(VSPEC1_SGMII_CTRL_ANEN | \
				 VSPEC1_SGMII_CTRL_ANRS)

/* Temperature sensor */
#define VSPEC1_TEMP_STA	0x0E
#define VSPEC1_TEMP_STA_DATA	GENMASK(9, 0)

/* Mailbox */
#define VSPEC1_MBOX_DATA	0x5
#define VSPEC1_MBOX_ADDRLO	0x6
#define VSPEC1_MBOX_CMD		0x7
#define VSPEC1_MBOX_CMD_ADDRHI	GENMASK(7, 0)
#define VSPEC1_MBOX_CMD_RD	(0 << 8)
#define VSPEC1_MBOX_CMD_READY	BIT(15)

/* WoL */
#define VPSPEC2_WOL_CTL		0x0E06
#define VPSPEC2_WOL_AD01	0x0E08
#define VPSPEC2_WOL_AD23	0x0E09
#define VPSPEC2_WOL_AD45	0x0E0A
#define WOL_EN			BIT(0)

/* Internal registers, access via mbox */
#define REG_GPIO0_OUT		0xd3ce00

struct gpy_priv {
	/* serialize mailbox acesses */
	struct mutex mbox_lock;

	u8 fw_major;
	u8 fw_minor;
	u32 wolopts;

	/* It takes 3 seconds to fully switch out of loopback mode before
	 * it can safely re-enter loopback mode. Record the time when
	 * loopback is disabled. Check and wait if necessary before loopback
	 * is enabled.
	 */
	u64 lb_dis_to;
};

static const struct {
	int major;
	int minor;
} ver_need_sgmii_reaneg[] = {
	{7, 0x6D},
	{8, 0x6D},
	{9, 0x73},
};

#if IS_ENABLED(CONFIG_HWMON)
/* The original translation formulae of the temperature (in degrees of Celsius)
 * are as follows:
 *
 *   T = -2.5761e-11*(N^4) + 9.7332e-8*(N^3) + -1.9165e-4*(N^2) +
 *       3.0762e-1*(N^1) + -5.2156e1
 *
 * where [-52.156, 137.961]C and N = [0, 1023].
 *
 * They must be accordingly altered to be suitable for the integer arithmetics.
 * The technique is called 'factor redistribution', which just makes sure the
 * multiplications and divisions are made so to have a result of the operations
 * within the integer numbers limit. In addition we need to translate the
 * formulae to accept millidegrees of Celsius. Here what it looks like after
 * the alterations:
 *
 *   T = -25761e-12*(N^4) + 97332e-9*(N^3) + -191650e-6*(N^2) +
 *       307620e-3*(N^1) + -52156
 *
 * where T = [-52156, 137961]mC and N = [0, 1023].
 */
static const struct polynomial poly_N_to_temp = {
	.terms = {
		{4,  -25761, 1000, 1},
		{3,   97332, 1000, 1},
		{2, -191650, 1000, 1},
		{1,  307620, 1000, 1},
		{0,  -52156,    1