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Date: Sun, 5 Jul 2020 19:16:26 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Cc: andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
claudiu.manoil@....com, alexandru.marginean@....com,
ioana.ciornei@....com, linux@...linux.org.uk
Subject: [PATCH v3 net-next 6/6] net: dsa: felix: use resolved link config in mac_link_up()
From: Vladimir Oltean <vladimir.oltean@....com>
Phylink now requires that parameters established through
auto-negotiation be written into the MAC at the time of the
mac_link_up() callback. In the case of felix, that means taking the port
out of reset, setting the correct timers for PAUSE frames, and
enabling/disabling TX flow control.
This patch also splits the inband and noinband configuration of the
vsc9959 PCS (currently found in a function called "init") into 2
different functions, which have a nomenclature closer to phylink:
"config", for inband setup, and "link_up", for noinband (forced) setup.
This is necessary as a preparation step for giving up control of the PCS
to phylink, which will be done in further patch series.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v3:
None.
Changes in v2:
Rebase on top of new patch 1/6.
drivers/net/dsa/ocelot/felix.c | 76 ++++----
drivers/net/dsa/ocelot/felix.h | 10 +-
drivers/net/dsa/ocelot/felix_vsc9959.c | 257 ++++++++++++++-----------
3 files changed, 187 insertions(+), 156 deletions(-)
diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 57c400a67f16..75652ed99b24 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -233,6 +233,32 @@ static int felix_phylink_mac_pcs_get_state(struct dsa_switch *ds, int port,
static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
unsigned int link_an_mode,
const struct phylink_link_state *state)
+{
+ struct ocelot *ocelot = ds->priv;
+ struct felix *felix = ocelot_to_felix(ocelot);
+
+ if (felix->info->pcs_config)
+ felix->info->pcs_config(ocelot, port, link_an_mode, state);
+}
+
+static void felix_phylink_mac_link_down(struct dsa_switch *ds, int port,
+ unsigned int link_an_mode,
+ phy_interface_t interface)
+{
+ struct ocelot *ocelot = ds->priv;
+ struct ocelot_port *ocelot_port = ocelot->ports[port];
+
+ ocelot_port_writel(ocelot_port, 0, DEV_MAC_ENA_CFG);
+ ocelot_rmw_rix(ocelot, 0, QSYS_SWITCH_PORT_MODE_PORT_ENA,
+ QSYS_SWITCH_PORT_MODE, port);
+}
+
+static void felix_phylink_mac_link_up(struct dsa_switch *ds, int port,
+ unsigned int link_an_mode,
+ phy_interface_t interface,
+ struct phy_device *phydev,
+ int speed, int duplex,
+ bool tx_pause, bool rx_pause)
{
struct ocelot *ocelot = ds->priv;
struct ocelot_port *ocelot_port = ocelot->ports[port];
@@ -250,7 +276,7 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
DEV_CLOCK_CFG_LINK_SPEED(OCELOT_SPEED_1000),
DEV_CLOCK_CFG);
- switch (state->speed) {
+ switch (speed) {
case SPEED_10:
mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(3);
break;
@@ -261,12 +287,9 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
case SPEED_2500:
mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(1);
break;
- case SPEED_UNKNOWN:
- mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(0);
- break;
default:
dev_err(ocelot->dev, "Unsupported speed on port %d: %d\n",
- port, state->speed);
+ port, speed);
return;
}
@@ -275,7 +298,7 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
*/
mac_fc_cfg |= SYS_MAC_FC_CFG_RX_FC_ENA;
- if (state->pause & MLO_PAUSE_TX)
+ if (tx_pause)
mac_fc_cfg |= SYS_MAC_FC_CFG_TX_FC_ENA |
SYS_MAC_FC_CFG_PAUSE_VAL_CFG(0xffff) |
SYS_MAC_FC_CFG_FC_LATENCY_CFG(0x7) |
@@ -288,37 +311,9 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
ocelot_write_rix(ocelot, 0, ANA_POL_FLOWC, port);
- if (felix->info->pcs_init)
- felix->info->pcs_init(ocelot, port, link_an_mode, state);
-
- if (felix->info->port_sched_speed_set)
- felix->info->port_sched_speed_set(ocelot, port,
- state->speed);
-}
-
-static void felix_phylink_mac_link_down(struct dsa_switch *ds, int port,
- unsigned int link_an_mode,
- phy_interface_t interface)
-{
- struct ocelot *ocelot = ds->priv;
- struct ocelot_port *ocelot_port = ocelot->ports[port];
-
- ocelot_port_writel(ocelot_port, 0, DEV_MAC_ENA_CFG);
- ocelot_rmw_rix(ocelot, 0, QSYS_SWITCH_PORT_MODE_PORT_ENA,
- QSYS_SWITCH_PORT_MODE, port);
-}
-
-static void felix_phylink_mac_link_up(struct dsa_switch *ds, int port,
- unsigned int link_an_mode,
- phy_interface_t interface,
- struct phy_device *phydev,
- int speed, int duplex,
- bool tx_pause, bool rx_pause)
-{
- struct ocelot *ocelot = ds->priv;
- struct ocelot_port *ocelot_port = ocelot->ports[port];
-
- /* Enable MAC module */
+ /* Undo the effects of felix_phylink_mac_link_down:
+ * enable MAC module
+ */
ocelot_port_writel(ocelot_port, DEV_MAC_ENA_CFG_RX_ENA |
DEV_MAC_ENA_CFG_TX_ENA, DEV_MAC_ENA_CFG);
@@ -335,6 +330,13 @@ static void felix_phylink_mac_link_up(struct dsa_switch *ds, int port,
QSYS_SWITCH_PORT_MODE_SCH_NEXT_CFG(1) |
QSYS_SWITCH_PORT_MODE_PORT_ENA,
QSYS_SWITCH_PORT_MODE, port);
+
+ if (felix->info->pcs_link_up)
+ felix->info->pcs_link_up(ocelot, port, link_an_mode, interface,
+ speed, duplex);
+
+ if (felix->info->port_sched_speed_set)
+ felix->info->port_sched_speed_set(ocelot, port, speed);
}
static void felix_port_qos_map_init(struct ocelot *ocelot, int port)
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index 4a4cebcf04a7..00137b64132b 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -28,9 +28,13 @@ struct felix_info {
int imdio_pci_bar;
int (*mdio_bus_alloc)(struct ocelot *ocelot);
void (*mdio_bus_free)(struct ocelot *ocelot);
- void (*pcs_init)(struct ocelot *ocelot, int port,
- unsigned int link_an_mode,
- const struct phylink_link_state *state);
+ void (*pcs_config)(struct ocelot *ocelot, int port,
+ unsigned int link_an_mode,
+ const struct phylink_link_state *state);
+ void (*pcs_link_up)(struct ocelot *ocelot, int port,
+ unsigned int link_an_mode,
+ phy_interface_t interface,
+ int speed, int duplex);
void (*pcs_link_state)(struct ocelot *ocelot, int port,
struct phylink_link_state *state);
int (*prevalidate_phy_mode)(struct ocelot *ocelot, int port,
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 65f83386bad1..19614537b1ba 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -737,124 +737,54 @@ static int vsc9959_reset(struct ocelot *ocelot)
* traffic if SGMII AN is enabled but not completed (acknowledged by us), so
* setting MLO_AN_INBAND is actually required for those.
*/
-static void vsc9959_pcs_init_sgmii(struct phy_device *pcs,
- unsigned int link_an_mode,
- const struct phylink_link_state *state)
+static void vsc9959_pcs_config_sgmii(struct phy_device *pcs,
+ unsigned int link_an_mode,
+ const struct phylink_link_state *state)
{
- if (link_an_mode == MLO_AN_INBAND) {
- int bmsr, bmcr;
-
- /* Some PHYs like VSC8234 don't like it when AN restarts on
- * their system side and they restart line side AN too, going
- * into an endless link up/down loop. Don't restart PCS AN if
- * link is up already.
- * We do check that AN is enabled just in case this is the 1st
- * call, PCS detects a carrier but AN is disabled from power on
- * or by boot loader.
- */
- bmcr = phy_read(pcs, MII_BMCR);
- if (bmcr < 0)
- return;
-
- bmsr = phy_read(pcs, MII_BMSR);
- if (bmsr < 0)
- return;
-
- if ((bmcr & BMCR_ANENABLE) && (bmsr & BMSR_LSTATUS))
- return;
-
- /* SGMII spec requires tx_config_Reg[15:0] to be exactly 0x4001
- * for the MAC PCS in order to acknowledge the AN.
- */
- phy_write(pcs, MII_ADVERTISE, ADVERTISE_SGMII |
- ADVERTISE_LPACK);
-
- phy_write(pcs, ENETC_PCS_IF_MODE,
- ENETC_PCS_IF_MODE_SGMII_EN |
- ENETC_PCS_IF_MODE_USE_SGMII_AN);
-
- /* Adjust link timer for SGMII */
- phy_write(pcs, ENETC_PCS_LINK_TIMER1,
- ENETC_PCS_LINK_TIMER1_VAL);
- phy_write(pcs, ENETC_PCS_LINK_TIMER2,
- ENETC_PCS_LINK_TIMER2_VAL);
-
- phy_set_bits(pcs, MII_BMCR, BMCR_ANENABLE);
- } else {
- u16 if_mode = ENETC_PCS_IF_MODE_SGMII_EN;
- int speed;
-
- switch (state->speed) {
- case SPEED_1000:
- speed = ENETC_PCS_SPEED_1000;
- break;
- case SPEED_100:
- speed = ENETC_PCS_SPEED_100;
- break;
- case SPEED_10:
- speed = ENETC_PCS_SPEED_10;
- break;
- case SPEED_UNKNOWN:
- /* Silently don't do anything */
- return;
- default:
- phydev_err(pcs, "Invalid PCS speed %d\n", state->speed);
- return;
- }
-
- if_mode |= ENETC_PCS_IF_MODE_SGMII_SPEED(speed);
- if (state->duplex == DUPLEX_HALF)
- if_mode |= ENETC_PCS_IF_MODE_DUPLEX_HALF;
-
- phy_clear_bits(pcs, MII_BMCR, BMCR_ANENABLE);
- }
-}
+ int bmsr, bmcr;
+
+ /* Some PHYs like VSC8234 don't like it when AN restarts on
+ * their system side and they restart line side AN too, going
+ * into an endless link up/down loop. Don't restart PCS AN if
+ * link is up already.
+ * We do check that AN is enabled just in case this is the 1st
+ * call, PCS detects a carrier but AN is disabled from power on
+ * or by boot loader.
+ */
+ bmcr = phy_read(pcs, MII_BMCR);
+ if (bmcr < 0)
+ return;
-/* 2500Base-X is SerDes protocol 7 on Felix and 6 on ENETC. It is a SerDes lane
- * clocked at 3.125 GHz which encodes symbols with 8b/10b and does not have
- * auto-negotiation of any link parameters. Electrically it is compatible with
- * a single lane of XAUI.
- * The hardware reference manual wants to call this mode SGMII, but it isn't
- * really, since the fundamental features of SGMII:
- * - Downgrading the link speed by duplicating symbols
- * - Auto-negotiation
- * are not there.
- * The speed is configured at 1000 in the IF_MODE and BMCR MDIO registers
- * because the clock frequency is actually given by a PLL configured in the
- * Reset Configuration Word (RCW).
- * Since there is no difference between fixed speed SGMII w/o AN and 802.3z w/o
- * AN, we call this PHY interface type 2500Base-X. In case a PHY negotiates a
- * lower link speed on line side, the system-side interface remains fixed at
- * 2500 Mbps and we do rate adaptation through pause frames.
- */
-static void vsc9959_pcs_init_2500basex(struct phy_device *pcs,
- unsigned int link_an_mode,
- const struct phylink_link_state *state)
-{
- u16 if_mode = ENETC_PCS_IF_MODE_SGMII_SPEED(ENETC_PCS_SPEED_2500) |
- ENETC_PCS_IF_MODE_SGMII_EN;
+ bmsr = phy_read(pcs, MII_BMSR);
+ if (bmsr < 0)
+ return;
- if (link_an_mode == MLO_AN_INBAND) {
- phydev_err(pcs, "AN not supported on 3.125GHz SerDes lane\n");
+ if ((bmcr & BMCR_ANENABLE) && (bmsr & BMSR_LSTATUS))
return;
- }
- if (state->duplex == DUPLEX_HALF)
- if_mode |= ENETC_PCS_IF_MODE_DUPLEX_HALF;
+ /* SGMII spec requires tx_config_Reg[15:0] to be exactly 0x4001
+ * for the MAC PCS in order to acknowledge the AN.
+ */
+ phy_write(pcs, MII_ADVERTISE, ADVERTISE_SGMII |
+ ADVERTISE_LPACK);
- phy_write(pcs, ENETC_PCS_IF_MODE, if_mode);
- phy_clear_bits(pcs, MII_BMCR, BMCR_ANENABLE);
+ phy_write(pcs, ENETC_PCS_IF_MODE,
+ ENETC_PCS_IF_MODE_SGMII_EN |
+ ENETC_PCS_IF_MODE_USE_SGMII_AN);
+
+ /* Adjust link timer for SGMII */
+ phy_write(pcs, ENETC_PCS_LINK_TIMER1,
+ ENETC_PCS_LINK_TIMER1_VAL);
+ phy_write(pcs, ENETC_PCS_LINK_TIMER2,
+ ENETC_PCS_LINK_TIMER2_VAL);
+
+ phy_set_bits(pcs, MII_BMCR, BMCR_ANENABLE);
}
-static void vsc9959_pcs_init_usxgmii(struct phy_device *pcs,
- unsigned int link_an_mode,
- const struct phylink_link_state *state)
+static void vsc9959_pcs_config_usxgmii(struct phy_device *pcs,
+ unsigned int link_an_mode,
+ const struct phylink_link_state *state)
{
- if (link_an_mode != MLO_AN_INBAND) {
- phydev_err(pcs, "USXGMII only supports in-band AN for now\n");
- return;
- }
-
/* Configure device ability for the USXGMII Replicator */
phy_write_mmd(pcs, MDIO_MMD_VEND2, MII_ADVERTISE,
USXGMII_ADVERTISE_SPEED(USXGMII_SPEED_2500) |
@@ -864,9 +794,9 @@ static void vsc9959_pcs_init_usxgmii(struct phy_device *pcs,
USXGMII_ADVERTISE_FDX);
}
-static void vsc9959_pcs_init(struct ocelot *ocelot, int port,
- unsigned int link_an_mode,
- const struct phylink_link_state *state)
+static void vsc9959_pcs_config(struct ocelot *ocelot, int port,
+ unsigned int link_an_mode,
+ const struct phylink_link_state *state)
{
struct felix *felix = ocelot_to_felix(ocelot);
struct phy_device *pcs = felix->pcs[port];
@@ -898,16 +828,110 @@ static void vsc9959_pcs_init(struct ocelot *ocelot, int port,
pcs->supported);
phy_advertise_supported(pcs);
+ if (!phylink_autoneg_inband(link_an_mode))
+ return;
+
switch (pcs->interface) {
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_QSGMII:
- vsc9959_pcs_init_sgmii(pcs, link_an_mode, state);
+ vsc9959_pcs_config_sgmii(pcs, link_an_mode, state);
break;
case PHY_INTERFACE_MODE_2500BASEX:
- vsc9959_pcs_init_2500basex(pcs, link_an_mode, state);
+ phydev_err(pcs, "AN not supported on 3.125GHz SerDes lane\n");
break;
case PHY_INTERFACE_MODE_USXGMII:
- vsc9959_pcs_init_usxgmii(pcs, link_an_mode, state);
+ vsc9959_pcs_config_usxgmii(pcs, link_an_mode, state);
+ break;
+ default:
+ dev_err(ocelot->dev, "Unsupported link mode %s\n",
+ phy_modes(pcs->interface));
+ }
+}
+
+static void vsc9959_pcs_link_up_sgmii(struct phy_device *pcs,
+ unsigned int link_an_mode,
+ int speed, int duplex)
+{
+ u16 if_mode = ENETC_PCS_IF_MODE_SGMII_EN;
+
+ switch (speed) {
+ case SPEED_1000:
+ if_mode |= ENETC_PCS_IF_MODE_SGMII_SPEED(ENETC_PCS_SPEED_1000);
+ break;
+ case SPEED_100:
+ if_mode |= ENETC_PCS_IF_MODE_SGMII_SPEED(ENETC_PCS_SPEED_100);
+ break;
+ case SPEED_10:
+ if_mode |= ENETC_PCS_IF_MODE_SGMII_SPEED(ENETC_PCS_SPEED_10);
+ break;
+ default:
+ phydev_err(pcs, "Invalid PCS speed %d\n", speed);
+ return;
+ }
+
+ if (duplex == DUPLEX_HALF)
+ if_mode |= ENETC_PCS_IF_MODE_DUPLEX_HALF;
+
+ phy_write(pcs, ENETC_PCS_IF_MODE, if_mode);
+ phy_clear_bits(pcs, MII_BMCR, BMCR_ANENABLE);
+}
+
+/* 2500Base-X is SerDes protocol 7 on Felix and 6 on ENETC. It is a SerDes lane
+ * clocked at 3.125 GHz which encodes symbols with 8b/10b and does not have
+ * auto-negotiation of any link parameters. Electrically it is compatible with
+ * a single lane of XAUI.
+ * The hardware reference manual wants to call this mode SGMII, but it isn't
+ * really, since the fundamental features of SGMII:
+ * - Downgrading the link speed by duplicating symbols
+ * - Auto-negotiation
+ * are not there.
+ * The speed is configured at 1000 in the IF_MODE and BMCR MDIO registers
+ * because the clock frequency is actually given by a PLL configured in the
+ * Reset Configuration Word (RCW).
+ * Since there is no difference between fixed speed SGMII w/o AN and 802.3z w/o
+ * AN, we call this PHY interface type 2500Base-X. In case a PHY negotiates a
+ * lower link speed on line side, the system-side interface remains fixed at
+ * 2500 Mbps and we do rate adaptation through pause frames.
+ */
+static void vsc9959_pcs_link_up_2500basex(struct phy_device *pcs,
+ unsigned int link_an_mode,
+ int speed, int duplex)
+{
+ u16 if_mode = ENETC_PCS_IF_MODE_SGMII_SPEED(ENETC_PCS_SPEED_2500) |
+ ENETC_PCS_IF_MODE_SGMII_EN;
+
+ if (duplex == DUPLEX_HALF)
+ if_mode |= ENETC_PCS_IF_MODE_DUPLEX_HALF;
+
+ phy_write(pcs, ENETC_PCS_IF_MODE, if_mode);
+ phy_clear_bits(pcs, MII_BMCR, BMCR_ANENABLE);
+}
+
+static void vsc9959_pcs_link_up(struct ocelot *ocelot, int port,
+ unsigned int link_an_mode,
+ phy_interface_t interface,
+ int speed, int duplex)
+{
+ struct felix *felix = ocelot_to_felix(ocelot);
+ struct phy_device *pcs = felix->pcs[port];
+
+ if (!pcs)
+ return;
+
+ if (phylink_autoneg_inband(link_an_mode))
+ return;
+
+ switch (interface) {
+ case PHY_INTERFACE_MODE_SGMII:
+ case PHY_INTERFACE_MODE_QSGMII:
+ vsc9959_pcs_link_up_sgmii(pcs, link_an_mode, speed, duplex);
+ break;
+ case PHY_INTERFACE_MODE_2500BASEX:
+ vsc9959_pcs_link_up_2500basex(pcs, link_an_mode, speed,
+ duplex);
+ break;
+ case PHY_INTERFACE_MODE_USXGMII:
+ phydev_err(pcs, "USXGMII only supports in-band AN for now\n");
break;
default:
dev_err(ocelot->dev, "Unsupported link mode %s\n",
@@ -1374,7 +1398,8 @@ struct felix_info felix_info_vsc9959 = {
.imdio_pci_bar = 0,
.mdio_bus_alloc = vsc9959_mdio_bus_alloc,
.mdio_bus_free = vsc9959_mdio_bus_free,
- .pcs_init = vsc9959_pcs_init,
+ .pcs_config = vsc9959_pcs_config,
+ .pcs_link_up = vsc9959_pcs_link_up,
.pcs_link_state = vsc9959_pcs_link_state,
.prevalidate_phy_mode = vsc9959_prevalidate_phy_mode,
.port_setup_tc = vsc9959_port_setup_tc,
--
2.25.1
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