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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* stmmac_pcs.h: Physical Coding Sublayer Header File
*
* Copyright (C) 2016 STMicroelectronics (R&D) Limited
* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*/
#ifndef __STMMAC_PCS_H__
#define __STMMAC_PCS_H__
#include <linux/slab.h>
#include <linux/io.h>
#include "common.h"
/* PCS registers (AN/TBI/SGMII/RGMII) offsets */
#define GMAC_AN_CTRL(x) (x) /* AN control */
#define GMAC_AN_STATUS(x) (x + 0x4) /* AN status */
#define GMAC_ANE_ADV(x) (x + 0x8) /* ANE Advertisement */
#define GMAC_ANE_LPA(x) (x + 0xc) /* ANE link partener ability */
#define GMAC_ANE_EXP(x) (x + 0x10) /* ANE expansion */
#define GMAC_TBI(x) (x + 0x14) /* TBI extend status */
/* AN Configuration defines */
#define GMAC_AN_CTRL_RAN BIT(9) /* Restart Auto-Negotiation */
#define GMAC_AN_CTRL_ANE BIT(12) /* Auto-Negotiation Enable */
#define GMAC_AN_CTRL_ELE BIT(14) /* External Loopback Enable */
#define GMAC_AN_CTRL_ECD BIT(16) /* Enable Comma Detect */
#define GMAC_AN_CTRL_LR BIT(17) /* Lock to Reference */
#define GMAC_AN_CTRL_SGMRAL BIT(18) /* SGMII RAL Control */
/* AN Status defines */
#define GMAC_AN_STATUS_LS BIT(2) /* Link Status 0:down 1:up */
#define GMAC_AN_STATUS_ANA BIT(3) /* Auto-Negotiation Ability */
#define GMAC_AN_STATUS_ANC BIT(5) /* Auto-Negotiation Complete */
#define GMAC_AN_STATUS_ES BIT(8) /* Extended Status */
/* ADV and LPA defines */
#define GMAC_ANE_FD BIT(5)
#define GMAC_ANE_HD BIT(6)
#define GMAC_ANE_PSE GENMASK(8, 7)
#define GMAC_ANE_PSE_SHIFT 7
#define GMAC_ANE_RFE GENMASK(13, 12)
#define GMAC_ANE_RFE_SHIFT 12
#define GMAC_ANE_ACK BIT(14)
/**
* dwmac_pcs_isr - TBI, RTBI, or SGMII PHY ISR
* @ioaddr: IO registers pointer
* @reg: Base address of the AN Control Register.
* @intr_status: GMAC core interrupt status
* @x: pointer to log these events as stats
* Description: it is the ISR for PCS events: Auto-Negotiation Completed and
* Link status.
*/
static inline void dwmac_pcs_isr(void __iomem *ioaddr, u32 reg,
unsigned int intr_status,
struct stmmac_extra_stats *x)
{
u32 val = readl(ioaddr + GMAC_AN_STATUS(reg));
if (intr_status & PCS_ANE_IRQ) {
x->irq_pcs_ane_n++;
if (val & GMAC_AN_STATUS_ANC)
pr_info("stmmac_pcs: ANE process completed\n");
}
if (intr_status & PCS_LINK_IRQ) {
x->irq_pcs_link_n++;
if (val & GMAC_AN_STATUS_LS)
pr_info("stmmac_pcs: Link Up\n");
else
pr_info("stmmac_pcs: Link Down\n");
}
}
/**
* dwmac_ctrl_ane - To program the AN Control Register.
* @ioaddr: IO registers pointer
* @reg: Base address of the AN Control Register.
* @ane: to enable the auto-negotiation
* @srgmi_ral: to manage MAC-2-MAC SGMII connections.
* @loopback: to cause the PHY to loopback tx data into rx path.
* Description: this is the main function to configure the AN control register
* and init the ANE, select loopback (usually for debugging purpose) and
* configure SGMII RAL.
*/
static inline void dwmac_ctrl_ane(void __iomem *ioaddr, u32 reg, bool ane,
bool srgmi_ral, bool loopback)
{
u32 value = readl(ioaddr + GMAC_AN_CTRL(reg));
/* Enable and restart the Auto-Negotiation */
if (ane)
value |= GMAC_AN_CTRL_ANE | GMAC_AN_CTRL_RAN;
else
value &= ~GMAC_AN_CTRL_ANE;
/* In case of MAC-2-MAC connection, block is configured to operate
* according to MAC conf register.
*/
if (srgmi_ral)
value |= GMAC_AN_CTRL_SGMRAL;
if (loopback)
value |= GMAC_AN_CTRL_ELE;
writel(value, ioaddr + GMAC_AN_CTRL(reg));
}
/**
* dwmac_get_adv_lp - Get ADV and LP cap
* @ioaddr: IO registers pointer
* @reg: Base address of the AN Control Register.
* @adv_lp: structure to store the adv,lp status
* Description: this is to expose the ANE advertisement and Link partner ability
* status to ethtool support.
*/
static inline void dwmac_get_adv_lp(void __iomem *ioaddr, u32 reg,
struct rgmii_adv *adv_lp)
{
u32 value = readl(ioaddr + GMAC_ANE_ADV(reg));
if (value & GMAC_ANE_FD)
adv_lp->duplex = DUPLEX_FULL;
if (value & GMAC_ANE_HD)
adv_lp->duplex |= DUPLEX_HALF;
adv_lp->pause = (value & GMAC_ANE_PSE) >> GMAC_ANE_PSE_SHIFT;
value = readl(ioaddr + GMAC_ANE_LPA(reg));
if (value & GMAC_ANE_FD)
adv_lp->lp_duplex = DUPLEX_FULL;
if (value & GMAC_ANE_HD)
adv_lp->lp_duplex = DUPLEX_HALF;
adv_lp->lp_pause = (value & GMAC_ANE_PSE) >> GMAC_ANE_PSE_SHIFT;
}
#endif /* __STMMAC_PCS_H__ */
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