projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| a2443fd1 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 49099122 HS |
2 | /* |
| 3 | * Driver for AMD am79c PHYs | |
| 4 | * | |
| 5 | * Author: Heiko Schocher <hs@denx.de> | |
| 6 | * | |
| 7 | * Copyright (c) 2011 DENX Software Engineering GmbH | |
| 49099122 HS |
8 | */ |
| 9 | #include <linux/kernel.h> | |
| 10 | #include <linux/errno.h> | |
| 11 | #include <linux/init.h> | |
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/mii.h> | |
| 14 | #include <linux/phy.h> | |
| 15 | ||
| 16 | #define PHY_ID_AM79C874 0x0022561b | |
| 17 | ||
| 18 | #define MII_AM79C_IR 17 /* Interrupt Status/Control Register */ | |
| 19 | #define MII_AM79C_IR_EN_LINK 0x0400 /* IR enable Linkstate */ | |
| 20 | #define MII_AM79C_IR_EN_ANEG 0x0100 /* IR enable Aneg Complete */ | |
| 21 | #define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG) | |
| 22 | ||
| d995a36b IC |
23 | #define MII_AM79C_IR_LINK_DOWN BIT(2) |
| 24 | #define MII_AM79C_IR_ANEG_DONE BIT(0) | |
| 25 | #define MII_AM79C_IR_IMASK_STAT (MII_AM79C_IR_LINK_DOWN | MII_AM79C_IR_ANEG_DONE) | |
| 26 | ||
| 49099122 HS |
27 | MODULE_DESCRIPTION("AMD PHY driver"); |
| 28 | MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); | |
| 29 | MODULE_LICENSE("GPL"); | |
| 30 | ||
| 31 | static int am79c_ack_interrupt(struct phy_device *phydev) | |
| 32 | { | |
| 33 | int err; | |
| 34 | ||
| 35 | err = phy_read(phydev, MII_BMSR); | |
| 36 | if (err < 0) | |
| 37 | return err; | |
| 38 | ||
| 39 | err = phy_read(phydev, MII_AM79C_IR); | |
| 40 | if (err < 0) | |
| 41 | return err; | |
| 42 | ||
| 43 | return 0; | |
| 44 | } | |
| 45 | ||
| 46 | static int am79c_config_init(struct phy_device *phydev) | |
| 47 | { | |
| 48 | return 0; | |
| 49 | } | |
| 50 | ||
| 51 | static int am79c_config_intr(struct phy_device *phydev) | |
| 52 | { | |
| 53 | int err; | |
| 54 | ||
| 347917c7 IC |
55 | if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { |
| 56 | err = am79c_ack_interrupt(phydev); | |
| 57 | if (err) | |
| 58 | return err; | |
| 59 | ||
| 49099122 | 60 | err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT); |
| 347917c7 | 61 | } else { |
| 49099122 | 62 | err = phy_write(phydev, MII_AM79C_IR, 0); |
| 347917c7 IC |
63 | if (err) |
| 64 | return err; | |
| 65 | ||
| 66 | err = am79c_ack_interrupt(phydev); | |
| 67 | } | |
| 49099122 HS |
68 | |
| 69 | return err; | |
| 70 | } | |
| 71 | ||
| d995a36b IC |
72 | static irqreturn_t am79c_handle_interrupt(struct phy_device *phydev) |
| 73 | { | |
| 74 | int irq_status; | |
| 75 | ||
| 76 | irq_status = phy_read(phydev, MII_AM79C_IR); | |
| 77 | if (irq_status < 0) { | |
| 78 | phy_error(phydev); | |
| 79 | return IRQ_NONE; | |
| 80 | } | |
| 81 | ||
| 82 | if (!(irq_status & MII_AM79C_IR_IMASK_STAT)) | |
| 83 | return IRQ_NONE; | |
| 84 | ||
| 85 | phy_trigger_machine(phydev); | |
| 86 | ||
| 87 | return IRQ_HANDLED; | |
| 88 | } | |
| 89 | ||
| 116dffa0 | 90 | static struct phy_driver am79c_driver[] = { { |
| 49099122 HS |
91 | .phy_id = PHY_ID_AM79C874, |
| 92 | .name = "AM79C874", | |
| 93 | .phy_id_mask = 0xfffffff0, | |
| dcdecdcf | 94 | /* PHY_BASIC_FEATURES */ |
| 49099122 | 95 | .config_init = am79c_config_init, |
| 49099122 | 96 | .config_intr = am79c_config_intr, |
| d995a36b | 97 | .handle_interrupt = am79c_handle_interrupt, |
| 116dffa0 | 98 | } }; |
| 49099122 | 99 | |
| 116dffa0 | 100 | module_phy_driver(am79c_driver); |
| 49099122 HS |
101 | |
| 102 | static struct mdio_device_id __maybe_unused amd_tbl[] = { | |
| 103 | { PHY_ID_AM79C874, 0xfffffff0 }, | |
| 104 | { } | |
| 105 | }; | |
| 106 | ||
| 107 | MODULE_DEVICE_TABLE(mdio, amd_tbl); |