1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * drivers/net/phy/qsemi.c 4 * 5 * Driver for Quality Semiconductor PHYs 6 * 7 * Author: Andy Fleming 8 * 9 * Copyright (c) 2004 Freescale Semiconductor, Inc. 10 */ 11 #include <linux/kernel.h> 12 #include <linux/string.h> 13 #include <linux/errno.h> 14 #include <linux/unistd.h> 15 #include <linux/interrupt.h> 16 #include <linux/init.h> 17 #include <linux/delay.h> 18 #include <linux/netdevice.h> 19 #include <linux/etherdevice.h> 20 #include <linux/skbuff.h> 21 #include <linux/spinlock.h> 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/mii.h> 25 #include <linux/ethtool.h> 26 #include <linux/phy.h> 27 28 #include <asm/io.h> 29 #include <asm/irq.h> 30 #include <linux/uaccess.h> 31 32 /* ------------------------------------------------------------------------- */ 33 /* The Quality Semiconductor QS6612 is used on the RPX CLLF */ 34 35 /* register definitions */ 36 37 #define MII_QS6612_MCR 17 /* Mode Control Register */ 38 #define MII_QS6612_FTR 27 /* Factory Test Register */ 39 #define MII_QS6612_MCO 28 /* Misc. Control Register */ 40 #define MII_QS6612_ISR 29 /* Interrupt Source Register */ 41 #define MII_QS6612_IMR 30 /* Interrupt Mask Register */ 42 #define MII_QS6612_IMR_INIT 0x003a 43 #define MII_QS6612_PCR 31 /* 100BaseTx PHY Control Reg. */ 44 45 #define QS6612_PCR_AN_COMPLETE 0x1000 46 #define QS6612_PCR_RLBEN 0x0200 47 #define QS6612_PCR_DCREN 0x0100 48 #define QS6612_PCR_4B5BEN 0x0040 49 #define QS6612_PCR_TX_ISOLATE 0x0020 50 #define QS6612_PCR_MLT3_DIS 0x0002 51 #define QS6612_PCR_SCRM_DESCRM 0x0001 52 53 MODULE_DESCRIPTION("Quality Semiconductor PHY driver"); 54 MODULE_AUTHOR("Andy Fleming"); 55 MODULE_LICENSE("GPL"); 56 57 /* Returns 0, unless there's a write error */ 58 static int qs6612_config_init(struct phy_device *phydev) 59 { 60 /* The PHY powers up isolated on the RPX, 61 * so send a command to allow operation. 62 * XXX - My docs indicate this should be 0x0940 63 * ...or something. The current value sets three 64 * reserved bits, bit 11, which specifies it should be 65 * set to one, bit 10, which specifies it should be set 66 * to 0, and bit 7, which doesn't specify. However, my 67 * docs are preliminary, and I will leave it like this 68 * until someone more knowledgable corrects me or it. 69 * -- Andy Fleming 70 */ 71 return phy_write(phydev, MII_QS6612_PCR, 0x0dc0); 72 } 73 74 static int qs6612_ack_interrupt(struct phy_device *phydev) 75 { 76 int err; 77 78 /* The Interrupt Source register is not self-clearing, bits 4 and 5 are 79 * cleared when MII_BMSR is read and bits 1 and 3 are cleared when 80 * MII_EXPANSION is read 81 */ 82 err = phy_read(phydev, MII_QS6612_ISR); 83 84 if (err < 0) 85 return err; 86 87 err = phy_read(phydev, MII_BMSR); 88 89 if (err < 0) 90 return err; 91 92 err = phy_read(phydev, MII_EXPANSION); 93 94 if (err < 0) 95 return err; 96 97 return 0; 98 } 99 100 static int qs6612_config_intr(struct phy_device *phydev) 101 { 102 int err; 103 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { 104 /* clear any interrupts before enabling them */ 105 err = qs6612_ack_interrupt(phydev); 106 if (err) 107 return err; 108 109 err = phy_write(phydev, MII_QS6612_IMR, 110 MII_QS6612_IMR_INIT); 111 } else { 112 err = phy_write(phydev, MII_QS6612_IMR, 0); 113 if (err) 114 return err; 115 116 /* clear any leftover interrupts */ 117 err = qs6612_ack_interrupt(phydev); 118 } 119 120 return err; 121 122 } 123 124 static irqreturn_t qs6612_handle_interrupt(struct phy_device *phydev) 125 { 126 int irq_status; 127 128 irq_status = phy_read(phydev, MII_QS6612_ISR); 129 if (irq_status < 0) { 130 phy_error(phydev); 131 return IRQ_NONE; 132 } 133 134 if (!(irq_status & MII_QS6612_IMR_INIT)) 135 return IRQ_NONE; 136 137 /* the interrupt source register is not self-clearing */ 138 qs6612_ack_interrupt(phydev); 139 140 phy_trigger_machine(phydev); 141 142 return IRQ_HANDLED; 143 } 144 145 static struct phy_driver qs6612_driver[] = { { 146 .phy_id = 0x00181440, 147 .name = "QS6612", 148 .phy_id_mask = 0xfffffff0, 149 /* PHY_BASIC_FEATURES */ 150 .config_init = qs6612_config_init, 151 .config_intr = qs6612_config_intr, 152 .handle_interrupt = qs6612_handle_interrupt, 153 } }; 154 155 module_phy_driver(qs6612_driver); 156 157 static struct mdio_device_id __maybe_unused qs6612_tbl[] = { 158 { 0x00181440, 0xfffffff0 }, 159 { } 160 }; 161 162 MODULE_DEVICE_TABLE(mdio, qs6612_tbl); 163