27.03.2015 20:15, Florian Fainelli пишет: > I think your concerns are valid, but I don't think there is going to be > any problem with the approach I suggested because there is a contract > that the fixed PHYs and regular PHYs need to Hello Florian.
As promised, today I tried to resurrect my first implementation and do things as you suggested: install the link_update callback for mvneta privately. I feel SGMII setup is very common and deserves the separate API, not the per-driver handling, but in any case, I'd like to show the implementation first, then discuss. Unfortunately, it didn't work quite right. The problem is that mvneta calls phy_disconnect() on .ndo_stop callback. After that, phy->attached_dev becomes NULL, and so the link_update callback gets called with net_dev==NULL! And crashs. Of course I can easily work around that, but IMHO its a bug - the one that actually gets fixed by the patches I posted previously. They were changing the callback to receive phy_device instead of net_device, and so NULL will never be passed. I am attaching the new patch so that you can take a look and decide. If you still think its fine, even despite the NULL passing w/a, then I'll mail it with the proper boilerplate. But if you agree that passing NULL to link_update is a bug, then maybe you'll decide to get the whole surgery thing. :) -=-=-=-=-=-=-=-=-=# Don't remove this line #=-=-=-=-=-=-=-=-=- 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 for links state changes, namely: - link up/down - link speed - duplex full/half fixed_phy link_update() callback is used to update status. Note: SGMII setup is so common that I think it deserves a separate API rather than the per-driver handling. There is an alternative implementation that adds such API: https://lkml.org/lkml/2015/3/27/346 CC: Thomas Petazzoni <thomas.petazz...@free-electrons.com> CC: Florian Fainelli <f.faine...@gmail.com> CC: net...@vger.kernel.org CC: linux-kernel@vger.kernel.org Signed-off-by: Stas Sergeev <s...@users.sourceforge.net> --- drivers/net/ethernet/marvell/mvneta.c | 97 +++++++++++++++++++++++++++++---- 1 file changed, 86 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 96208f1..5b9cc0a 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -100,6 +100,8 @@ #define MVNETA_TXQ_CMD 0x2448 #define MVNETA_TXQ_DISABLE_SHIFT 8 #define MVNETA_TXQ_ENABLE_MASK 0x000000ff +#define MVNETA_GMAC_CLOCK_DIVIDER 0x24f4 +#define MVNETA_GMAC_1MS_CLOCK_ENABLE BIT(31) #define MVNETA_ACC_MODE 0x2500 #define MVNETA_CPU_MAP(cpu) (0x2540 + ((cpu) << 2)) #define MVNETA_CPU_RXQ_ACCESS_ALL_MASK 0x000000ff @@ -122,6 +124,7 @@ #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 @@ -165,6 +168,7 @@ #define MVNETA_GMAC_MAX_RX_SIZE_MASK 0x7ffc #define MVNETA_GMAC0_PORT_ENABLE BIT(0) #define MVNETA_GMAC_CTRL_2 0x2c08 +#define MVNETA_GMAC2_INBAND_AN_ENABLE BIT(0) #define MVNETA_GMAC2_PCS_ENABLE BIT(3) #define MVNETA_GMAC2_PORT_RGMII BIT(4) #define MVNETA_GMAC2_PORT_RESET BIT(6) @@ -180,9 +184,11 @@ #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) +#define MVNETA_GMAC_AN_FLOW_CTRL_EN BIT(11) #define MVNETA_GMAC_CONFIG_FULL_DUPLEX BIT(12) #define MVNETA_GMAC_AN_DUPLEX_EN BIT(13) #define MVNETA_MIB_COUNTERS_BASE 0x3080 @@ -304,6 +310,7 @@ 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 +1001,20 @@ 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 | + MVNETA_GMAC_AN_FLOW_CTRL_EN); + val |= MVNETA_GMAC_INBAND_AN_ENABLE | + MVNETA_GMAC_AN_SPEED_EN | + MVNETA_GMAC_AN_DUPLEX_EN; + mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG, val); + val = mvreg_read(pp, MVNETA_GMAC_CLOCK_DIVIDER); + val |= MVNETA_GMAC_1MS_CLOCK_ENABLE; + mvreg_write(pp, MVNETA_GMAC_CLOCK_DIVIDER, val); + } + mvneta_set_ucast_table(pp, -1); mvneta_set_special_mcast_table(pp, -1); mvneta_set_other_mcast_table(pp, -1); @@ -2043,6 +2064,29 @@ static irqreturn_t mvneta_isr(int irq, void *dev_id) return IRQ_HANDLED; } +static int mvneta_fixed_link_update(struct net_device *dev, + struct fixed_phy_status *status) +{ + struct mvneta_port *pp; + u32 gmac_stat; + + if (!dev) { + /* we have a bug here */ + return -EINVAL; + } + pp = netdev_priv(dev); + gmac_stat = mvreg_read(pp, MVNETA_GMAC_STATUS); + status->link = !!(gmac_stat & MVNETA_GMAC_LINK_UP); + if (gmac_stat & MVNETA_GMAC_SPEED_1000) + status->speed = SPEED_1000; + else if (gmac_stat & MVNETA_GMAC_SPEED_100) + status->speed = SPEED_100; + else + status->speed = SPEED_10; + status->duplex = !!(gmac_stat & MVNETA_GMAC_FULL_DUPLEX); + return 0; +} + /* 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 +2107,12 @@ 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) { + /* since phylib uses polling, not much to do here... + * Any way to tell phylib to do the poll NOW? */ + mvreg_write(pp, MVNETA_INTR_MISC_CAUSE, 0); + } /* Release Tx descriptors */ if (cause_rx_tx & MVNETA_TX_INTR_MASK_ALL) { @@ -2109,7 +2157,9 @@ 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 +2423,13 @@ 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 +2579,7 @@ 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 +2608,24 @@ 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); @@ -2910,6 +2976,9 @@ static int mvneta_port_power_up(struct mvneta_port *pp, int phy_mode) return -EINVAL; } + if (pp->inband_status) + ctrl |= MVNETA_GMAC2_INBAND_AN_ENABLE; + /* Cancel Port Reset */ ctrl &= ~MVNETA_GMAC2_PORT_RESET; mvreg_write(pp, MVNETA_GMAC_CTRL_2, ctrl); @@ -2934,6 +3003,7 @@ 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 @@ -2956,6 +3026,7 @@ static int mvneta_probe(struct platform_device *pdev) phy_node = of_parse_phandle(dn, "phy", 0); if (!phy_node) { + struct phy_device *phy; if (!of_phy_is_fixed_link(dn)) { dev_err(&pdev->dev, "no PHY specified\n"); err = -ENODEV; @@ -2967,11 +3038,14 @@ 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. */ phy_node = of_node_get(dn); + phy = of_phy_find_device(dn); + fixed_phy_set_link_update(phy, mvneta_fixed_link_update); } phy_mode = of_get_phy_mode(dn); @@ -2990,6 +3064,7 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
