diff options
Diffstat (limited to 'drivers/net/phy/dp83848.c')
| -rw-r--r-- | drivers/net/phy/dp83848.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/net/phy/dp83848.c b/drivers/net/phy/dp83848.c new file mode 100644 index 000000000..937061acf --- /dev/null +++ b/drivers/net/phy/dp83848.c @@ -0,0 +1,166 @@ +// 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 <linux/module.h> +#include <linux/phy.h> + +#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 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, \ + } + +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 <afd@ti.com>"); +MODULE_LICENSE("GPL v2"); |