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// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
/*
* Northstar Plus switch SerDes/SGMII PHY main logic
*
* Copyright (C) 2018 Florian Fainelli <f.fainelli@gmail.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/phy.h>
#include <linux/phylink.h>
#include <net/dsa.h>
#include "b53_priv.h"
#include "b53_serdes.h"
#include "b53_regs.h"
static inline struct b53_pcs *pcs_to_b53_pcs(struct phylink_pcs *pcs)
{
return container_of(pcs, struct b53_pcs, pcs);
}
static void b53_serdes_write_blk(struct b53_device *dev, u8 offset, u16 block,
u16 value)
{
b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, block);
b53_write16(dev, B53_SERDES_PAGE, offset, value);
}
static u16 b53_serdes_read_blk(struct b53_device *dev, u8 offset, u16 block)
{
u16 value;
b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, block);
b53_read16(dev, B53_SERDES_PAGE, offset, &value);
return value;
}
static void b53_serdes_set_lane(struct b53_device *dev, u8 lane)
{
if (dev->serdes_lane == lane)
return;
WARN_ON(lane > 1);
b53_serdes_write_blk(dev, B53_SERDES_LANE,
SERDES_XGXSBLK0_BLOCKADDRESS, lane);
dev->serdes_lane = lane;
}
static void b53_serdes_write(struct b53_device *dev, u8 lane,
u8 offset, u16 block, u16 value)
{
b53_serdes_set_lane(dev, lane);
b53_serdes_write_blk(dev, offset, block, value);
}
static u16 b53_serdes_read(struct b53_device *dev, u8 lane,
u8 offset, u16 block)
{
b53_serdes_set_lane(dev, lane);
return b53_serdes_read_blk(dev, offset, block);
}
static int b53_serdes_config(struct phylink_pcs *pcs, unsigned int neg_mode,
phy_interface_t interface,
const unsigned long *advertising,
bool permit_pause_to_mac)
{
struct b53_device *dev = pcs_to_b53_pcs(pcs)->dev;
u8 lane = pcs_to_b53_pcs(pcs)->lane;
u16 reg;
reg = b53_serdes_read(dev, lane, B53_SERDES_DIGITAL_CONTROL(1),
SERDES_DIGITAL_BLK);
if (interface == PHY_INTERFACE_MODE_1000BASEX)
reg |= FIBER_MODE_1000X;
else
reg &= ~FIBER_MODE_1000X;
b53_serdes_write(dev, lane, B53_SERDES_DIGITAL_CONTROL(1),
SERDES_DIGITAL_BLK, reg);
return 0;
}
static void b53_serdes_an_restart(struct phylink_pcs *pcs)
{
struct b53_device *dev = pcs_to_b53_pcs(pcs)->dev;
u8 lane = pcs_to_b53_pcs(pcs)->lane;
u16 reg;
reg = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
SERDES_MII_BLK);
reg |= BMCR_ANRESTART;
b53_serdes_write(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
SERDES_MII_BLK, reg);
}
static void b53_serdes_get_state(struct phylink_pcs *pcs,
struct phylink_link_state *state)
{
struct b53_device *dev = pcs_to_b53_pcs(pcs)->dev;
u8 lane = pcs_to_b53_pcs(pcs)->lane;
u16 dig, bmsr;
dig = b53_serdes_read(dev, lane, B53_SERDES_DIGITAL_STATUS,
SERDES_DIGITAL_BLK);
bmsr = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMSR),
SERDES_MII_BLK);
switch ((dig >> SPEED_STATUS_SHIFT) & SPEED_STATUS_MASK) {
case SPEED_STATUS_10:
state->speed = SPEED_10;
break;
case SPEED_STATUS_100:
state->speed = SPEED_100;
break;
case SPEED_STATUS_1000:
state->speed = SPEED_1000;
break;
default:
case SPEED_STATUS_2500:
state->speed = SPEED_2500;
break;
}
state->duplex = dig & DUPLEX_STATUS ? DUPLEX_FULL : DUPLEX_HALF;
state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
state->link = !!(dig & LINK_STATUS);
if (dig & PAUSE_RESOLUTION_RX_SIDE)
state->pause |= MLO_PAUSE_RX;
if (dig & PAUSE_RESOLUTION_TX_SIDE)
state->pause |= MLO_PAUSE_TX;
}
void b53_serdes_link_set(struct b53_device *dev, int port, unsigned int mode,
phy_interface_t interface, bool link_up)
{
u8 lane = b53_serdes_map_lane(dev, port);
u16 reg;
if (lane == B53_INVALID_LANE)
return;
reg = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
SERDES_MII_BLK);
if (link_up)
reg &= ~BMCR_PDOWN;
else
reg |= BMCR_PDOWN;
b53_serdes_write(dev, lane, B53_SERDES_MII_REG(MII_BMCR),
SERDES_MII_BLK, reg);
}
EXPORT_SYMBOL(b53_serdes_link_set);
static const struct phylink_pcs_ops b53_pcs_ops = {
.pcs_get_state = b53_serdes_get_state,
.pcs_config = b53_serdes_config,
.pcs_an_restart = b53_serdes_an_restart,
};
void b53_serdes_phylink_get_caps(struct b53_device *dev, int port,
struct phylink_config *config)
{
u8 lane = b53_serdes_map_lane(dev, port);
if (lane == B53_INVALID_LANE)
return;
switch (lane) {
case 0:
/* It appears lane 0 supports 2500base-X and 1000base-X */
__set_bit(PHY_INTERFACE_MODE_2500BASEX,
config->supported_interfaces);
config->mac_capabilities |= MAC_2500FD;
fallthrough;
case 1:
/* It appears lane 1 only supports 1000base-X and SGMII */
__set_bit(PHY_INTERFACE_MODE_1000BASEX,
config->supported_interfaces);
__set_bit(PHY_INTERFACE_MODE_SGMII,
config->supported_interfaces);
config->mac_capabilities |= MAC_1000FD;
break;
default:
break;
}
}
EXPORT_SYMBOL(b53_serdes_phylink_get_caps);
struct phylink_pcs *b53_serdes_phylink_mac_select_pcs(struct b53_device *dev,
int port,
phy_interface_t interface)
{
u8 lane = b53_serdes_map_lane(dev, port);
if (lane == B53_INVALID_LANE || lane >= B53_N_PCS ||
!dev->pcs[lane].dev)
return NULL;
if (!phy_interface_mode_is_8023z(interface) &&
interface != PHY_INTERFACE_MODE_SGMII)
return NULL;
return &dev->pcs[lane].pcs;
}
EXPORT_SYMBOL(b53_serdes_phylink_mac_select_pcs);
int b53_serdes_init(struct b53_device *dev, int port)
{
u8 lane = b53_serdes_map_lane(dev, port);
struct b53_pcs *pcs;
u16 id0, msb, lsb;
if (lane == B53_INVALID_LANE)
return -EINVAL;
id0 = b53_serdes_read(dev, lane, B53_SERDES_ID0, SERDES_ID0);
msb = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_PHYSID1),
SERDES_MII_BLK);
lsb = b53_serdes_read(dev, lane, B53_SERDES_MII_REG(MII_PHYSID2),
SERDES_MII_BLK);
if (id0 == 0 || id0 == 0xffff) {
dev_err(dev->dev, "SerDes not initialized, check settings\n");
return -ENODEV;
}
dev_info(dev->dev,
"SerDes lane %d, model: %d, rev %c%d (OUI: 0x%08x)\n",
lane, id0 & SERDES_ID0_MODEL_MASK,
(id0 >> SERDES_ID0_REV_LETTER_SHIFT) + 0x41,
(id0 >> SERDES_ID0_REV_NUM_SHIFT) & SERDES_ID0_REV_NUM_MASK,
(u32)msb << 16 | lsb);
pcs = &dev->pcs[lane];
pcs->dev = dev;
pcs->lane = lane;
pcs->pcs.ops = &b53_pcs_ops;
pcs->pcs.neg_mode = true;
return 0;
}
EXPORT_SYMBOL(b53_serdes_init);
MODULE_AUTHOR("Florian Fainelli <f.fainelli@gmail.com>");
MODULE_DESCRIPTION("B53 Switch SerDes driver");
MODULE_LICENSE("Dual BSD/GPL");
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