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1/*
2 * Broadcom BCM7xxx internal transceivers support.
3 *
4 * Copyright (C) 2014, Broadcom Corporation
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/phy.h>
14#include <linux/delay.h>
15#include <linux/bitops.h>
16#include <linux/brcmphy.h>
17
18/* Broadcom BCM7xxx internal PHY registers */
19#define MII_BCM7XXX_CHANNEL_WIDTH 0x2000
20
21/* 40nm only register definitions */
22#define MII_BCM7XXX_100TX_AUX_CTL 0x10
23#define MII_BCM7XXX_100TX_FALSE_CAR 0x13
24#define MII_BCM7XXX_100TX_DISC 0x14
25#define MII_BCM7XXX_AUX_MODE 0x1d
26#define MII_BCM7XX_64CLK_MDIO BIT(12)
27#define MII_BCM7XXX_CORE_BASE1E 0x1e
28#define MII_BCM7XXX_TEST 0x1f
29#define MII_BCM7XXX_SHD_MODE_2 BIT(2)
30
31/* 28nm only register definitions */
32#define MISC_ADDR(base, channel) base, channel
33
34#define DSP_TAP10 MISC_ADDR(0x0a, 0)
35#define PLL_PLLCTRL_1 MISC_ADDR(0x32, 1)
36#define PLL_PLLCTRL_2 MISC_ADDR(0x32, 2)
37#define PLL_PLLCTRL_4 MISC_ADDR(0x33, 0)
38
39#define AFE_RXCONFIG_0 MISC_ADDR(0x38, 0)
40#define AFE_RXCONFIG_1 MISC_ADDR(0x38, 1)
41#define AFE_RX_LP_COUNTER MISC_ADDR(0x38, 3)
42#define AFE_TX_CONFIG MISC_ADDR(0x39, 0)
43#define AFE_HPF_TRIM_OTHERS MISC_ADDR(0x3a, 0)
44
45#define CORE_EXPB0 0xb0
46
47static int bcm7445_config_init(struct phy_device *phydev)
48{
49 int ret;
50 const struct bcm7445_regs {
51 int reg;
52 u16 value;
53 } bcm7445_regs_cfg[] = {
54 /* increases ADC latency by 24ns */
55 { MII_BCM54XX_EXP_SEL, 0x0038 },
56 { MII_BCM54XX_EXP_DATA, 0xAB95 },
57 /* increases internal 1V LDO voltage by 5% */
58 { MII_BCM54XX_EXP_SEL, 0x2038 },
59 { MII_BCM54XX_EXP_DATA, 0xBB22 },
60 /* reduce RX low pass filter corner frequency */
61 { MII_BCM54XX_EXP_SEL, 0x6038 },
62 { MII_BCM54XX_EXP_DATA, 0xFFC5 },
63 /* reduce RX high pass filter corner frequency */
64 { MII_BCM54XX_EXP_SEL, 0x003a },
65 { MII_BCM54XX_EXP_DATA, 0x2002 },
66 };
67 unsigned int i;
68
69 for (i = 0; i < ARRAY_SIZE(bcm7445_regs_cfg); i++) {
70 ret = phy_write(phydev,
71 bcm7445_regs_cfg[i].reg,
72 bcm7445_regs_cfg[i].value);
73 if (ret)
74 return ret;
75 }
76
77 return 0;
78}
79
80static void phy_write_exp(struct phy_device *phydev,
81 u16 reg, u16 value)
82{
83 phy_write(phydev, MII_BCM54XX_EXP_SEL, MII_BCM54XX_EXP_SEL_ER | reg);
84 phy_write(phydev, MII_BCM54XX_EXP_DATA, value);
85}
86
87static void phy_write_misc(struct phy_device *phydev,
88 u16 reg, u16 chl, u16 value)
89{
90 int tmp;
91
92 phy_write(phydev, MII_BCM54XX_AUX_CTL, MII_BCM54XX_AUXCTL_SHDWSEL_MISC);
93
94 tmp = phy_read(phydev, MII_BCM54XX_AUX_CTL);
95 tmp |= MII_BCM54XX_AUXCTL_ACTL_SMDSP_ENA;
96 phy_write(phydev, MII_BCM54XX_AUX_CTL, tmp);
97
98 tmp = (chl * MII_BCM7XXX_CHANNEL_WIDTH) | reg;
99 phy_write(phydev, MII_BCM54XX_EXP_SEL, tmp);
100
101 phy_write(phydev, MII_BCM54XX_EXP_DATA, value);
102}
103
104static int bcm7xxx_28nm_afe_config_init(struct phy_device *phydev)
105{
106 /* Increase VCO range to prevent unlocking problem of PLL at low
107 * temp
108 */
109 phy_write_misc(phydev, PLL_PLLCTRL_1, 0x0048);
110
111 /* Change Ki to 011 */
112 phy_write_misc(phydev, PLL_PLLCTRL_2, 0x021b);
113
114 /* Disable loading of TVCO buffer to bandgap, set bandgap trim
115 * to 111
116 */
117 phy_write_misc(phydev, PLL_PLLCTRL_4, 0x0e20);
118
119 /* Adjust bias current trim by -3 */
120 phy_write_misc(phydev, DSP_TAP10, 0x690b);
121
122 /* Switch to CORE_BASE1E */
123 phy_write(phydev, MII_BCM7XXX_CORE_BASE1E, 0xd);
124
125 /* Reset R_CAL/RC_CAL Engine */
126 phy_write_exp(phydev, CORE_EXPB0, 0x0010);
127
128 /* Disable Reset R_CAL/RC_CAL Engine */
129 phy_write_exp(phydev, CORE_EXPB0, 0x0000);
130
131 /* write AFE_RXCONFIG_0 */
132 phy_write_misc(phydev, AFE_RXCONFIG_0, 0xeb19);
133
134 /* write AFE_RXCONFIG_1 */
135 phy_write_misc(phydev, AFE_RXCONFIG_1, 0x9a3f);
136
137 /* write AFE_RX_LP_COUNTER */
138 phy_write_misc(phydev, AFE_RX_LP_COUNTER, 0x7fc0);
139
140 /* write AFE_HPF_TRIM_OTHERS */
141 phy_write_misc(phydev, AFE_HPF_TRIM_OTHERS, 0x000b);
142
143 /* write AFTE_TX_CONFIG */
144 phy_write_misc(phydev, AFE_TX_CONFIG, 0x0800);
145
146 return 0;
147}
148
149static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
150{
151 int ret;
152
153 ret = bcm7445_config_init(phydev);
154 if (ret)
155 return ret;
156
157 return bcm7xxx_28nm_afe_config_init(phydev);
158}
159
160static int phy_set_clr_bits(struct phy_device *dev, int location,
161 int set_mask, int clr_mask)
162{
163 int v, ret;
164
165 v = phy_read(dev, location);
166 if (v < 0)
167 return v;
168
169 v &= ~clr_mask;
170 v |= set_mask;
171
172 ret = phy_write(dev, location, v);
173 if (ret < 0)
174 return ret;
175
176 return v;
177}
178
179static int bcm7xxx_config_init(struct phy_device *phydev)
180{
181 int ret;
182
183 /* Enable 64 clock MDIO */
184 phy_write(phydev, MII_BCM7XXX_AUX_MODE, MII_BCM7XX_64CLK_MDIO);
185 phy_read(phydev, MII_BCM7XXX_AUX_MODE);
186
187 /* Workaround only required for 100Mbits/sec */
188 if (!(phydev->dev_flags & PHY_BRCM_100MBPS_WAR))
189 return 0;
190
191 /* set shadow mode 2 */
192 ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST,
193 MII_BCM7XXX_SHD_MODE_2, MII_BCM7XXX_SHD_MODE_2);
194 if (ret < 0)
195 return ret;
196
197 /* set iddq_clkbias */
198 phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0F00);
199 udelay(10);
200
201 /* reset iddq_clkbias */
202 phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0C00);
203
204 phy_write(phydev, MII_BCM7XXX_100TX_FALSE_CAR, 0x7555);
205
206 /* reset shadow mode 2 */
207 ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST, MII_BCM7XXX_SHD_MODE_2, 0);
208 if (ret < 0)
209 return ret;
210
211 return 0;
212}
213
214/* Workaround for putting the PHY in IDDQ mode, required
215 * for all BCM7XXX PHYs
216 */
217static int bcm7xxx_suspend(struct phy_device *phydev)
218{
219 int ret;
220 const struct bcm7xxx_regs {
221 int reg;
222 u16 value;
223 } bcm7xxx_suspend_cfg[] = {
224 { MII_BCM7XXX_TEST, 0x008b },
225 { MII_BCM7XXX_100TX_AUX_CTL, 0x01c0 },
226 { MII_BCM7XXX_100TX_DISC, 0x7000 },
227 { MII_BCM7XXX_TEST, 0x000f },
228 { MII_BCM7XXX_100TX_AUX_CTL, 0x20d0 },
229 { MII_BCM7XXX_TEST, 0x000b },
230 };
231 unsigned int i;
232
233 for (i = 0; i < ARRAY_SIZE(bcm7xxx_suspend_cfg); i++) {
234 ret = phy_write(phydev,
235 bcm7xxx_suspend_cfg[i].reg,
236 bcm7xxx_suspend_cfg[i].value);
237 if (ret)
238 return ret;
239 }
240
241 return 0;
242}
243
244static int bcm7xxx_dummy_config_init(struct phy_device *phydev)
245{
246 return 0;
247}
248
249static struct phy_driver bcm7xxx_driver[] = {
250{
251 .phy_id = PHY_ID_BCM7366,
252 .phy_id_mask = 0xfffffff0,
253 .name = "Broadcom BCM7366",
254 .features = PHY_GBIT_FEATURES |
255 SUPPORTED_Pause | SUPPORTED_Asym_Pause,
256 .flags = PHY_IS_INTERNAL,
257 .config_init = bcm7xxx_28nm_afe_config_init,
258 .config_aneg = genphy_config_aneg,
259 .read_status = genphy_read_status,
260 .suspend = bcm7xxx_suspend,
261 .resume = bcm7xxx_28nm_afe_config_init,
262 .driver = { .owner = THIS_MODULE },
263}, {
264 .phy_id = PHY_ID_BCM7439,
265 .phy_id_mask = 0xfffffff0,
266 .name = "Broadcom BCM7439",
267 .features = PHY_GBIT_FEATURES |
268 SUPPORTED_Pause | SUPPORTED_Asym_Pause,
269 .flags = PHY_IS_INTERNAL,
270 .config_init = bcm7xxx_28nm_afe_config_init,
271 .config_aneg = genphy_config_aneg,
272 .read_status = genphy_read_status,
273 .suspend = bcm7xxx_suspend,
274 .resume = bcm7xxx_28nm_afe_config_init,
275 .driver = { .owner = THIS_MODULE },
276}, {
277 .phy_id = PHY_ID_BCM7445,
278 .phy_id_mask = 0xfffffff0,
279 .name = "Broadcom BCM7445",
280 .features = PHY_GBIT_FEATURES |
281 SUPPORTED_Pause | SUPPORTED_Asym_Pause,
282 .flags = PHY_IS_INTERNAL,
283 .config_init = bcm7xxx_28nm_config_init,
284 .config_aneg = genphy_config_aneg,
285 .read_status = genphy_read_status,
286 .suspend = bcm7xxx_suspend,
287 .resume = bcm7xxx_28nm_config_init,
288 .driver = { .owner = THIS_MODULE },
289}, {
290 .name = "Broadcom BCM7XXX 28nm",
291 .phy_id = PHY_ID_BCM7XXX_28,
292 .phy_id_mask = PHY_BCM_OUI_MASK,
293 .features = PHY_GBIT_FEATURES |
294 SUPPORTED_Pause | SUPPORTED_Asym_Pause,
295 .flags = PHY_IS_INTERNAL,
296 .config_init = bcm7xxx_28nm_config_init,
297 .config_aneg = genphy_config_aneg,
298 .read_status = genphy_read_status,
299 .suspend = bcm7xxx_suspend,
300 .resume = bcm7xxx_28nm_config_init,
301 .driver = { .owner = THIS_MODULE },
302}, {
303 .phy_id = PHY_BCM_OUI_4,
304 .phy_id_mask = 0xffff0000,
305 .name = "Broadcom BCM7XXX 40nm",
306 .features = PHY_GBIT_FEATURES |
307 SUPPORTED_Pause | SUPPORTED_Asym_Pause,
308 .flags = PHY_IS_INTERNAL,
309 .config_init = bcm7xxx_config_init,
310 .config_aneg = genphy_config_aneg,
311 .read_status = genphy_read_status,
312 .suspend = bcm7xxx_suspend,
313 .resume = bcm7xxx_config_init,
314 .driver = { .owner = THIS_MODULE },
315}, {
316 .phy_id = PHY_BCM_OUI_5,
317 .phy_id_mask = 0xffffff00,
318 .name = "Broadcom BCM7XXX 65nm",
319 .features = PHY_BASIC_FEATURES |
320 SUPPORTED_Pause | SUPPORTED_Asym_Pause,
321 .flags = PHY_IS_INTERNAL,
322 .config_init = bcm7xxx_dummy_config_init,
323 .config_aneg = genphy_config_aneg,
324 .read_status = genphy_read_status,
325 .suspend = bcm7xxx_suspend,
326 .resume = bcm7xxx_config_init,
327 .driver = { .owner = THIS_MODULE },
328} };
329
330static struct mdio_device_id __maybe_unused bcm7xxx_tbl[] = {
331 { PHY_ID_BCM7366, 0xfffffff0, },
332 { PHY_ID_BCM7439, 0xfffffff0, },
333 { PHY_ID_BCM7445, 0xfffffff0, },
334 { PHY_ID_BCM7XXX_28, 0xfffffc00 },
335 { PHY_BCM_OUI_4, 0xffff0000 },
336 { PHY_BCM_OUI_5, 0xffffff00 },
337 { }
338};
339
340static int __init bcm7xxx_phy_init(void)
341{
342 return phy_drivers_register(bcm7xxx_driver,
343 ARRAY_SIZE(bcm7xxx_driver));
344}
345
346static void __exit bcm7xxx_phy_exit(void)
347{
348 phy_drivers_unregister(bcm7xxx_driver,
349 ARRAY_SIZE(bcm7xxx_driver));
350}
351
352module_init(bcm7xxx_phy_init);
353module_exit(bcm7xxx_phy_exit);
354
355MODULE_DEVICE_TABLE(mdio, bcm7xxx_tbl);
356
357MODULE_DESCRIPTION("Broadcom BCM7xxx internal PHY driver");
358MODULE_LICENSE("GPL");
359MODULE_AUTHOR("Broadcom Corporation");