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1/*
2 * Amlogic Meson GXL Internal PHY Driver
3 *
4 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
5 * Copyright (C) 2016 BayLibre, SAS. All rights reserved.
6 * Author: Neil Armstrong <narmstrong@baylibre.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 */
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/mii.h>
22#include <linux/ethtool.h>
23#include <linux/phy.h>
24#include <linux/netdevice.h>
25#include <linux/bitfield.h>
26
27#define TSTCNTL 20
28#define TSTCNTL_READ BIT(15)
29#define TSTCNTL_WRITE BIT(14)
30#define TSTCNTL_REG_BANK_SEL GENMASK(12, 11)
31#define TSTCNTL_TEST_MODE BIT(10)
32#define TSTCNTL_READ_ADDRESS GENMASK(9, 5)
33#define TSTCNTL_WRITE_ADDRESS GENMASK(4, 0)
34#define TSTREAD1 21
35#define TSTWRITE 23
36#define INTSRC_FLAG 29
37#define INTSRC_ANEG_PR BIT(1)
38#define INTSRC_PARALLEL_FAULT BIT(2)
39#define INTSRC_ANEG_LP_ACK BIT(3)
40#define INTSRC_LINK_DOWN BIT(4)
41#define INTSRC_REMOTE_FAULT BIT(5)
42#define INTSRC_ANEG_COMPLETE BIT(6)
43#define INTSRC_MASK 30
44
45#define BANK_ANALOG_DSP 0
46#define BANK_WOL 1
47#define BANK_BIST 3
48
49/* WOL Registers */
50#define LPI_STATUS 0xc
51#define LPI_STATUS_RSV12 BIT(12)
52
53/* BIST Registers */
54#define FR_PLL_CONTROL 0x1b
55#define FR_PLL_DIV0 0x1c
56#define FR_PLL_DIV1 0x1d
57
58static int meson_gxl_open_banks(struct phy_device *phydev)
59{
60 int ret;
61
62 /* Enable Analog and DSP register Bank access by
63 * toggling TSTCNTL_TEST_MODE bit in the TSTCNTL register
64 */
65 ret = phy_write(phydev, TSTCNTL, 0);
66 if (ret)
67 return ret;
68 ret = phy_write(phydev, TSTCNTL, TSTCNTL_TEST_MODE);
69 if (ret)
70 return ret;
71 ret = phy_write(phydev, TSTCNTL, 0);
72 if (ret)
73 return ret;
74 return phy_write(phydev, TSTCNTL, TSTCNTL_TEST_MODE);
75}
76
77static void meson_gxl_close_banks(struct phy_device *phydev)
78{
79 phy_write(phydev, TSTCNTL, 0);
80}
81
82static int meson_gxl_read_reg(struct phy_device *phydev,
83 unsigned int bank, unsigned int reg)
84{
85 int ret;
86
87 ret = meson_gxl_open_banks(phydev);
88 if (ret)
89 goto out;
90
91 ret = phy_write(phydev, TSTCNTL, TSTCNTL_READ |
92 FIELD_PREP(TSTCNTL_REG_BANK_SEL, bank) |
93 TSTCNTL_TEST_MODE |
94 FIELD_PREP(TSTCNTL_READ_ADDRESS, reg));
95 if (ret)
96 goto out;
97
98 ret = phy_read(phydev, TSTREAD1);
99out:
100 /* Close the bank access on our way out */
101 meson_gxl_close_banks(phydev);
102 return ret;
103}
104
105static int meson_gxl_write_reg(struct phy_device *phydev,
106 unsigned int bank, unsigned int reg,
107 uint16_t value)
108{
109 int ret;
110
111 ret = meson_gxl_open_banks(phydev);
112 if (ret)
113 goto out;
114
115 ret = phy_write(phydev, TSTWRITE, value);
116 if (ret)
117 goto out;
118
119 ret = phy_write(phydev, TSTCNTL, TSTCNTL_WRITE |
120 FIELD_PREP(TSTCNTL_REG_BANK_SEL, bank) |
121 TSTCNTL_TEST_MODE |
122 FIELD_PREP(TSTCNTL_WRITE_ADDRESS, reg));
123
124out:
125 /* Close the bank access on our way out */
126 meson_gxl_close_banks(phydev);
127 return ret;
128}
129
130static int meson_gxl_config_init(struct phy_device *phydev)
131{
132 int ret;
133
134 /* Enable fractional PLL */
135 ret = meson_gxl_write_reg(phydev, BANK_BIST, FR_PLL_CONTROL, 0x5);
136 if (ret)
137 return ret;
138
139 /* Program fraction FR_PLL_DIV1 */
140 ret = meson_gxl_write_reg(phydev, BANK_BIST, FR_PLL_DIV1, 0x029a);
141 if (ret)
142 return ret;
143
144 /* Program fraction FR_PLL_DIV1 */
145 ret = meson_gxl_write_reg(phydev, BANK_BIST, FR_PLL_DIV0, 0xaaaa);
146 if (ret)
147 return ret;
148
149 return genphy_config_init(phydev);
150}
151
152/* This function is provided to cope with the possible failures of this phy
153 * during aneg process. When aneg fails, the PHY reports that aneg is done
154 * but the value found in MII_LPA is wrong:
155 * - Early failures: MII_LPA is just 0x0001. if MII_EXPANSION reports that
156 * the link partner (LP) supports aneg but the LP never acked our base
157 * code word, it is likely that we never sent it to begin with.
158 * - Late failures: MII_LPA is filled with a value which seems to make sense
159 * but it actually is not what the LP is advertising. It seems that we
160 * can detect this using a magic bit in the WOL bank (reg 12 - bit 12).
161 * If this particular bit is not set when aneg is reported being done,
162 * it means MII_LPA is likely to be wrong.
163 *
164 * In both case, forcing a restart of the aneg process solve the problem.
165 * When this failure happens, the first retry is usually successful but,
166 * in some cases, it may take up to 6 retries to get a decent result
167 */
168static int meson_gxl_read_status(struct phy_device *phydev)
169{
170 int ret, wol, lpa, exp;
171
172 if (phydev->autoneg == AUTONEG_ENABLE) {
173 ret = genphy_aneg_done(phydev);
174 if (ret < 0)
175 return ret;
176 else if (!ret)
177 goto read_status_continue;
178
179 /* Aneg is done, let's check everything is fine */
180 wol = meson_gxl_read_reg(phydev, BANK_WOL, LPI_STATUS);
181 if (wol < 0)
182 return wol;
183
184 lpa = phy_read(phydev, MII_LPA);
185 if (lpa < 0)
186 return lpa;
187
188 exp = phy_read(phydev, MII_EXPANSION);
189 if (exp < 0)
190 return exp;
191
192 if (!(wol & LPI_STATUS_RSV12) ||
193 ((exp & EXPANSION_NWAY) && !(lpa & LPA_LPACK))) {
194 /* Looks like aneg failed after all */
195 phydev_dbg(phydev, "LPA corruption - aneg restart\n");
196 return genphy_restart_aneg(phydev);
197 }
198 }
199
200read_status_continue:
201 return genphy_read_status(phydev);
202}
203
204static int meson_gxl_ack_interrupt(struct phy_device *phydev)
205{
206 int ret = phy_read(phydev, INTSRC_FLAG);
207
208 return ret < 0 ? ret : 0;
209}
210
211static int meson_gxl_config_intr(struct phy_device *phydev)
212{
213 u16 val;
214
215 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
216 val = INTSRC_ANEG_PR
217 | INTSRC_PARALLEL_FAULT
218 | INTSRC_ANEG_LP_ACK
219 | INTSRC_LINK_DOWN
220 | INTSRC_REMOTE_FAULT
221 | INTSRC_ANEG_COMPLETE;
222 } else {
223 val = 0;
224 }
225
226 return phy_write(phydev, INTSRC_MASK, val);
227}
228
229static struct phy_driver meson_gxl_phy[] = {
230 {
231 .phy_id = 0x01814400,
232 .phy_id_mask = 0xfffffff0,
233 .name = "Meson GXL Internal PHY",
234 .features = PHY_BASIC_FEATURES,
235 .flags = PHY_IS_INTERNAL | PHY_HAS_INTERRUPT,
236 .config_init = meson_gxl_config_init,
237 .aneg_done = genphy_aneg_done,
238 .read_status = meson_gxl_read_status,
239 .ack_interrupt = meson_gxl_ack_interrupt,
240 .config_intr = meson_gxl_config_intr,
241 .suspend = genphy_suspend,
242 .resume = genphy_resume,
243 },
244};
245
246static struct mdio_device_id __maybe_unused meson_gxl_tbl[] = {
247 { 0x01814400, 0xfffffff0 },
248 { }
249};
250
251module_phy_driver(meson_gxl_phy);
252
253MODULE_DEVICE_TABLE(mdio, meson_gxl_tbl);
254
255MODULE_DESCRIPTION("Amlogic Meson GXL Internal PHY driver");
256MODULE_AUTHOR("Baoqi wang");
257MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
258MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
259MODULE_LICENSE("GPL");