From 8b73fa3ae02b2401960de41b0454c0321377b203 Mon Sep 17 00:00:00 2001 From: Robert Hancock Date: Thu, 27 Jan 2022 10:37:35 -0600 Subject: [PATCH] net: macb: Added ZynqMP-specific initialization The GEM controllers on ZynqMP were missing some initialization steps which are required in some cases when using SGMII mode, which uses the PS-GTR transceivers managed by the phy-zynqmp driver. The GEM core appears to need a hardware-level reset in order to work properly in SGMII mode in cases where the GT reference clock was not present at initial power-on. This can be done using a reset mapped to the zynqmp-reset driver in the device tree. Also, when in SGMII mode, the GEM driver needs to ensure the PHY is initialized and powered on. Signed-off-by: Robert Hancock Reviewed-by: Claudiu Beznea Signed-off-by: David S. Miller --- drivers/net/ethernet/cadence/macb.h | 4 ++ drivers/net/ethernet/cadence/macb_main.c | 63 ++++++++++++++++++++++-- 2 files changed, 64 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 9ddbee7de72b9..f0a7d8396a4ae 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -12,6 +12,7 @@ #include #include #include +#include #if defined(CONFIG_ARCH_DMA_ADDR_T_64BIT) || defined(CONFIG_MACB_USE_HWSTAMP) #define MACB_EXT_DESC @@ -1291,6 +1292,9 @@ struct macb { u32 wol; struct macb_ptp_info *ptp_info; /* macb-ptp interface */ + + struct phy *sgmii_phy; /* for ZynqMP SGMII mode */ + #ifdef MACB_EXT_DESC uint8_t hw_dma_cap; #endif diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index a363da928e8b3..1ce20bf52f727 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -34,7 +34,9 @@ #include #include #include +#include #include +#include #include "macb.h" /* This structure is only used for MACB on SiFive FU540 devices */ @@ -2739,10 +2741,14 @@ static int macb_open(struct net_device *dev) macb_init_hw(bp); - err = macb_phylink_connect(bp); + err = phy_power_on(bp->sgmii_phy); if (err) goto reset_hw; + err = macb_phylink_connect(bp); + if (err) + goto phy_off; + netif_tx_start_all_queues(dev); if (bp->ptp_info) @@ -2750,6 +2756,9 @@ static int macb_open(struct net_device *dev) return 0; +phy_off: + phy_power_off(bp->sgmii_phy); + reset_hw: macb_reset_hw(bp); for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) @@ -2775,6 +2784,8 @@ static int macb_close(struct net_device *dev) phylink_stop(bp->phylink); phylink_disconnect_phy(bp->phylink); + phy_power_off(bp->sgmii_phy); + spin_lock_irqsave(&bp->lock, flags); macb_reset_hw(bp); netif_carrier_off(dev); @@ -4544,13 +4555,55 @@ static const struct macb_config np4_config = { .usrio = &macb_default_usrio, }; +static int zynqmp_init(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + struct macb *bp = netdev_priv(dev); + int ret; + + if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) { + /* Ensure PS-GTR PHY device used in SGMII mode is ready */ + bp->sgmii_phy = devm_phy_get(&pdev->dev, "sgmii-phy"); + + if (IS_ERR(bp->sgmii_phy)) { + ret = PTR_ERR(bp->sgmii_phy); + dev_err_probe(&pdev->dev, ret, + "failed to get PS-GTR PHY\n"); + return ret; + } + + ret = phy_init(bp->sgmii_phy); + if (ret) { + dev_err(&pdev->dev, "failed to init PS-GTR PHY: %d\n", + ret); + return ret; + } + } + + /* Fully reset GEM controller at hardware level using zynqmp-reset driver, + * if mapped in device tree. + */ + ret = device_reset_optional(&pdev->dev); + if (ret) { + dev_err_probe(&pdev->dev, ret, "failed to reset controller"); + phy_exit(bp->sgmii_phy); + return ret; + } + + ret = macb_init(pdev); + if (ret) + phy_exit(bp->sgmii_phy); + + return ret; +} + static const struct macb_config zynqmp_config = { .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO | MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_BD_RD_PREFETCH, .dma_burst_length = 16, .clk_init = macb_clk_init, - .init = macb_init, + .init = zynqmp_init, .jumbo_max_len = 10240, .usrio = &macb_default_usrio, }; @@ -4767,7 +4820,7 @@ static int macb_probe(struct platform_device *pdev) err = macb_mii_init(bp); if (err) - goto err_out_free_netdev; + goto err_out_phy_exit; netif_carrier_off(dev); @@ -4792,6 +4845,9 @@ err_out_unregister_mdio: mdiobus_unregister(bp->mii_bus); mdiobus_free(bp->mii_bus); +err_out_phy_exit: + phy_exit(bp->sgmii_phy); + err_out_free_netdev: free_netdev(dev); @@ -4813,6 +4869,7 @@ static int macb_remove(struct platform_device *pdev) if (dev) { bp = netdev_priv(dev); + phy_exit(bp->sgmii_phy); mdiobus_unregister(bp->mii_bus); mdiobus_free(bp->mii_bus); -- 2.39.5