From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/net/phy/dp83848.c | 168 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 168 insertions(+) create mode 100644 drivers/net/phy/dp83848.c (limited to 'drivers/net/phy/dp83848.c') diff --git a/drivers/net/phy/dp83848.c b/drivers/net/phy/dp83848.c new file mode 100644 index 000000000..d88b1999d --- /dev/null +++ b/drivers/net/phy/dp83848.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for the Texas Instruments DP83848 PHY + * + * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/ + */ + +#include +#include + +#define TI_DP83848C_PHY_ID 0x20005ca0 +#define TI_DP83620_PHY_ID 0x20005ce0 +#define NS_DP83848C_PHY_ID 0x20005c90 +#define TLK10X_PHY_ID 0x2000a210 + +/* Registers */ +#define DP83848_MICR 0x11 /* MII Interrupt Control Register */ +#define DP83848_MISR 0x12 /* MII Interrupt Status Register */ + +/* MICR Register Fields */ +#define DP83848_MICR_INT_OE BIT(0) /* Interrupt Output Enable */ +#define DP83848_MICR_INTEN BIT(1) /* Interrupt Enable */ + +/* MISR Register Fields */ +#define DP83848_MISR_RHF_INT_EN BIT(0) /* Receive Error Counter */ +#define DP83848_MISR_FHF_INT_EN BIT(1) /* False Carrier Counter */ +#define DP83848_MISR_ANC_INT_EN BIT(2) /* Auto-negotiation complete */ +#define DP83848_MISR_DUP_INT_EN BIT(3) /* Duplex Status */ +#define DP83848_MISR_SPD_INT_EN BIT(4) /* Speed status */ +#define DP83848_MISR_LINK_INT_EN BIT(5) /* Link status */ +#define DP83848_MISR_ED_INT_EN BIT(6) /* Energy detect */ +#define DP83848_MISR_LQM_INT_EN BIT(7) /* Link Quality Monitor */ + +#define DP83848_INT_EN_MASK \ + (DP83848_MISR_ANC_INT_EN | \ + DP83848_MISR_DUP_INT_EN | \ + DP83848_MISR_SPD_INT_EN | \ + DP83848_MISR_LINK_INT_EN) + +#define DP83848_MISR_RHF_INT BIT(8) +#define DP83848_MISR_FHF_INT BIT(9) +#define DP83848_MISR_ANC_INT BIT(10) +#define DP83848_MISR_DUP_INT BIT(11) +#define DP83848_MISR_SPD_INT BIT(12) +#define DP83848_MISR_LINK_INT BIT(13) +#define DP83848_MISR_ED_INT BIT(14) + +#define DP83848_INT_MASK \ + (DP83848_MISR_ANC_INT | \ + DP83848_MISR_DUP_INT | \ + DP83848_MISR_SPD_INT | \ + DP83848_MISR_LINK_INT) + +static int dp83848_ack_interrupt(struct phy_device *phydev) +{ + int err = phy_read(phydev, DP83848_MISR); + + return err < 0 ? err : 0; +} + +static int dp83848_config_intr(struct phy_device *phydev) +{ + int control, ret; + + control = phy_read(phydev, DP83848_MICR); + if (control < 0) + return control; + + if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { + ret = dp83848_ack_interrupt(phydev); + if (ret) + return ret; + + control |= DP83848_MICR_INT_OE; + control |= DP83848_MICR_INTEN; + + ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK); + if (ret < 0) + return ret; + + ret = phy_write(phydev, DP83848_MICR, control); + } else { + control &= ~DP83848_MICR_INTEN; + ret = phy_write(phydev, DP83848_MICR, control); + if (ret) + return ret; + + ret = dp83848_ack_interrupt(phydev); + } + + return ret; +} + +static irqreturn_t dp83848_handle_interrupt(struct phy_device *phydev) +{ + int irq_status; + + irq_status = phy_read(phydev, DP83848_MISR); + if (irq_status < 0) { + phy_error(phydev); + return IRQ_NONE; + } + + if (!(irq_status & DP83848_INT_MASK)) + return IRQ_NONE; + + phy_trigger_machine(phydev); + + return IRQ_HANDLED; +} + +static int dp83848_config_init(struct phy_device *phydev) +{ + int val; + + /* DP83620 always reports Auto Negotiation Ability on BMSR. Instead, + * we check initial value of BMCR Auto negotiation enable bit + */ + val = phy_read(phydev, MII_BMCR); + if (!(val & BMCR_ANENABLE)) + phydev->autoneg = AUTONEG_DISABLE; + + return 0; +} + +static const struct mdio_device_id __maybe_unused dp83848_tbl[] = { + { TI_DP83848C_PHY_ID, 0xfffffff0 }, + { NS_DP83848C_PHY_ID, 0xfffffff0 }, + { TI_DP83620_PHY_ID, 0xfffffff0 }, + { TLK10X_PHY_ID, 0xfffffff0 }, + { } +}; +MODULE_DEVICE_TABLE(mdio, dp83848_tbl); + +#define DP83848_PHY_DRIVER(_id, _name, _config_init) \ + { \ + .phy_id = _id, \ + .phy_id_mask = 0xfffffff0, \ + .name = _name, \ + /* PHY_BASIC_FEATURES */ \ + \ + .soft_reset = genphy_soft_reset, \ + .config_init = _config_init, \ + .suspend = genphy_suspend, \ + .resume = genphy_resume, \ + \ + /* IRQ related */ \ + .config_intr = dp83848_config_intr, \ + .handle_interrupt = dp83848_handle_interrupt, \ + \ + .flags = PHY_RST_AFTER_CLK_EN, \ + } + +static struct phy_driver dp83848_driver[] = { + DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY", + NULL), + DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY", + NULL), + DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY", + dp83848_config_init), + DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY", + NULL), +}; +module_phy_driver(dp83848_driver); + +MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver"); +MODULE_AUTHOR("Andrew F. Davis "); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1