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Date: Fri, 27 Mar 2015 16:39:41 +0300
From: Stas Sergeev <stsp@...t.ru>
To: netdev@...r.kernel.org
CC: Linux kernel <linux-kernel@...r.kernel.org>,
Stas Sergeev <stsp@...rs.sourceforge.net>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: [PATCH 5/6] mvneta: implement SGMII-based in-band link state signaling
When MDIO bus is unavailable (common setup for SGMII), the in-band
signaling must be used to correctly track link state.
This patch enables the in-band status delivery and interrupts for
links state changes, namely:
- link up/down
- link speed
- duplex full/half
Upon reciving the appropriate interrupt, the driver updates the
fixed_phy status to match the received status.
CC: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC: netdev@...r.kernel.org
CC: linux-kernel@...r.kernel.org
Signed-off-by: Stas Sergeev <stsp@...rs.sourceforge.net>
---
drivers/net/ethernet/marvell/mvneta.c | 92 +++++++++++++++++++++++++++++----
1 file changed, 81 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 96208f1..2d1c689 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -122,6 +122,7 @@
#define MVNETA_TX_INTR_MASK_ALL (0xff << 0)
#define MVNETA_RX_INTR_MASK(nr_rxqs) (((1 << nr_rxqs) - 1) << 8)
#define MVNETA_RX_INTR_MASK_ALL (0xff << 8)
+#define MVNETA_MISCINTR_INTR_MASK BIT(31)
#define MVNETA_INTR_OLD_CAUSE 0x25a8
#define MVNETA_INTR_OLD_MASK 0x25ac
@@ -180,6 +181,7 @@
#define MVNETA_GMAC_AUTONEG_CONFIG 0x2c0c
#define MVNETA_GMAC_FORCE_LINK_DOWN BIT(0)
#define MVNETA_GMAC_FORCE_LINK_PASS BIT(1)
+#define MVNETA_GMAC_INBAND_AN_ENABLE BIT(2)
#define MVNETA_GMAC_CONFIG_MII_SPEED BIT(5)
#define MVNETA_GMAC_CONFIG_GMII_SPEED BIT(6)
#define MVNETA_GMAC_AN_SPEED_EN BIT(7)
@@ -304,6 +306,7 @@ struct mvneta_port {
unsigned int link;
unsigned int duplex;
unsigned int speed;
+ int inband_status;
};
/* The mvneta_tx_desc and mvneta_rx_desc structures describe the
@@ -994,6 +997,16 @@ static void mvneta_defaults_set(struct mvneta_port *pp)
val &= ~MVNETA_PHY_POLLING_ENABLE;
mvreg_write(pp, MVNETA_UNIT_CONTROL, val);
+ if (pp->inband_status) {
+ val = mvreg_read(pp, MVNETA_GMAC_AUTONEG_CONFIG);
+ val &= ~(MVNETA_GMAC_FORCE_LINK_PASS |
+ MVNETA_GMAC_FORCE_LINK_DOWN);
+ val |= MVNETA_GMAC_INBAND_AN_ENABLE |
+ MVNETA_GMAC_AN_SPEED_EN |
+ MVNETA_GMAC_AN_DUPLEX_EN;
+ mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG, val);
+ }
+
mvneta_set_ucast_table(pp, -1);
mvneta_set_special_mcast_table(pp, -1);
mvneta_set_other_mcast_table(pp, -1);
@@ -2043,6 +2056,21 @@ static irqreturn_t mvneta_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static void mvneta_get_phy_status(struct mvneta_port *pp,
+ struct fixed_phy_status *r_stat)
+{
+ u32 gmac_stat = mvreg_read(pp, MVNETA_GMAC_STATUS);
+
+ r_stat->link = !!(gmac_stat & MVNETA_GMAC_LINK_UP);
+ if (gmac_stat & MVNETA_GMAC_SPEED_1000)
+ r_stat->speed = SPEED_1000;
+ else if (gmac_stat & MVNETA_GMAC_SPEED_100)
+ r_stat->speed = SPEED_100;
+ else
+ r_stat->speed = SPEED_10;
+ r_stat->duplex = !!(gmac_stat & MVNETA_GMAC_FULL_DUPLEX);
+}
+
/* NAPI handler
* Bits 0 - 7 of the causeRxTx register indicate that are transmitted
* packets on the corresponding TXQ (Bit 0 is for TX queue 1).
@@ -2063,8 +2091,29 @@ static int mvneta_poll(struct napi_struct *napi, int budget)
}
/* Read cause register */
- cause_rx_tx = mvreg_read(pp, MVNETA_INTR_NEW_CAUSE) &
- (MVNETA_RX_INTR_MASK(rxq_number) | MVNETA_TX_INTR_MASK(txq_number));
+ cause_rx_tx = mvreg_read(pp, MVNETA_INTR_NEW_CAUSE);
+ if (cause_rx_tx & MVNETA_MISCINTR_INTR_MASK) {
+ u32 cause_misc = mvreg_read(pp, MVNETA_INTR_MISC_CAUSE);
+
+ mvreg_write(pp, MVNETA_INTR_MISC_CAUSE, 0);
+ if (pp->inband_status && (cause_misc &
+ (MVNETA_CAUSE_PHY_STATUS_CHANGE |
+ MVNETA_CAUSE_LINK_CHANGE |
+ MVNETA_CAUSE_PSC_SYNC_CHANGE))) {
+ struct fixed_phy_status phy_stat;
+
+ mvneta_get_phy_status(pp, &phy_stat);
+ if (pp->link != phy_stat.link)
+ of_phy_fixed_link_set_link(pp->phy_dev,
+ phy_stat.link);
+ if (pp->speed != phy_stat.speed)
+ of_phy_fixed_link_set_speed(pp->phy_dev,
+ phy_stat.speed);
+ if (pp->duplex != phy_stat.duplex)
+ of_phy_fixed_link_set_duplex(pp->phy_dev,
+ phy_stat.duplex);
+ }
+ }
/* Release Tx descriptors */
if (cause_rx_tx & MVNETA_TX_INTR_MASK_ALL) {
@@ -2109,7 +2158,9 @@ static int mvneta_poll(struct napi_struct *napi, int budget)
napi_complete(napi);
local_irq_save(flags);
mvreg_write(pp, MVNETA_INTR_NEW_MASK,
- MVNETA_RX_INTR_MASK(rxq_number) | MVNETA_TX_INTR_MASK(txq_number));
+ MVNETA_RX_INTR_MASK(rxq_number) |
+ MVNETA_TX_INTR_MASK(txq_number) |
+ MVNETA_MISCINTR_INTR_MASK);
local_irq_restore(flags);
}
@@ -2373,7 +2424,13 @@ static void mvneta_start_dev(struct mvneta_port *pp)
/* Unmask interrupts */
mvreg_write(pp, MVNETA_INTR_NEW_MASK,
- MVNETA_RX_INTR_MASK(rxq_number) | MVNETA_TX_INTR_MASK(txq_number));
+ MVNETA_RX_INTR_MASK(rxq_number) |
+ MVNETA_TX_INTR_MASK(txq_number) |
+ MVNETA_MISCINTR_INTR_MASK);
+ mvreg_write(pp, MVNETA_INTR_MISC_MASK,
+ MVNETA_CAUSE_PHY_STATUS_CHANGE |
+ MVNETA_CAUSE_LINK_CHANGE |
+ MVNETA_CAUSE_PSC_SYNC_CHANGE);
phy_start(pp->phy_dev);
netif_tx_start_all_queues(pp->dev);
@@ -2523,9 +2580,7 @@ static void mvneta_adjust_link(struct net_device *ndev)
val = mvreg_read(pp, MVNETA_GMAC_AUTONEG_CONFIG);
val &= ~(MVNETA_GMAC_CONFIG_MII_SPEED |
MVNETA_GMAC_CONFIG_GMII_SPEED |
- MVNETA_GMAC_CONFIG_FULL_DUPLEX |
- MVNETA_GMAC_AN_SPEED_EN |
- MVNETA_GMAC_AN_DUPLEX_EN);
+ MVNETA_GMAC_CONFIG_FULL_DUPLEX);
if (phydev->duplex)
val |= MVNETA_GMAC_CONFIG_FULL_DUPLEX;
@@ -2554,12 +2609,24 @@ static void mvneta_adjust_link(struct net_device *ndev)
if (status_change) {
if (phydev->link) {
- u32 val = mvreg_read(pp, MVNETA_GMAC_AUTONEG_CONFIG);
- val |= (MVNETA_GMAC_FORCE_LINK_PASS |
- MVNETA_GMAC_FORCE_LINK_DOWN);
- mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG, val);
+ if (!pp->inband_status) {
+ u32 val = mvreg_read(pp,
+ MVNETA_GMAC_AUTONEG_CONFIG);
+ val &= ~MVNETA_GMAC_FORCE_LINK_DOWN;
+ val |= MVNETA_GMAC_FORCE_LINK_PASS;
+ mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG,
+ val);
+ }
mvneta_port_up(pp);
} else {
+ if (!pp->inband_status) {
+ u32 val = mvreg_read(pp,
+ MVNETA_GMAC_AUTONEG_CONFIG);
+ val &= ~MVNETA_GMAC_FORCE_LINK_PASS;
+ val |= MVNETA_GMAC_FORCE_LINK_DOWN;
+ mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG,
+ val);
+ }
mvneta_port_down(pp);
}
phy_print_status(phydev);
@@ -2934,6 +3001,7 @@ static int mvneta_probe(struct platform_device *pdev)
char hw_mac_addr[ETH_ALEN];
const char *mac_from;
int phy_mode;
+ int fixed_phy = 0;
int err;
/* Our multiqueue support is not complete, so for now, only
@@ -2967,6 +3035,7 @@ static int mvneta_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "cannot register fixed PHY\n");
goto err_free_irq;
}
+ fixed_phy = 1;
/* In the case of a fixed PHY, the DT node associated
* to the PHY is the Ethernet MAC DT node.
@@ -2990,6 +3059,7 @@ static int mvneta_probe(struct platform_device *pdev)
pp = netdev_priv(dev);
pp->phy_node = phy_node;
pp->phy_interface = phy_mode;
+ pp->inband_status = (phy_mode == PHY_INTERFACE_MODE_SGMII) && fixed_phy;
pp->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pp->clk)) {
--
1.7.9.5
--
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