tjh.dev
Linux kernel mirror (for testing)
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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
53MODULE_DESCRIPTION("Quality Semiconductor PHY driver");
54MODULE_AUTHOR("Andy Fleming");
55MODULE_LICENSE("GPL");
56
57/* Returns 0, unless there's a write error */
58static 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
74static 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
100static 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
124static 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
145static 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
155module_phy_driver(qs6612_driver);
156
157static struct mdio_device_id __maybe_unused qs6612_tbl[] = {
158 { 0x00181440, 0xfffffff0 },
159 { }
160};
161
162MODULE_DEVICE_TABLE(mdio, qs6612_tbl);