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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 "bcm-phy-lib.h"
16 #include <linux/bitops.h>
17 #include <linux/brcmphy.h>
18 #include <linux/mdio.h>
19
20 /* Broadcom BCM7xxx internal PHY registers */
21
22 /* 40nm only register definitions */
23 #define MII_BCM7XXX_100TX_AUX_CTL       0x10
24 #define MII_BCM7XXX_100TX_FALSE_CAR     0x13
25 #define MII_BCM7XXX_100TX_DISC          0x14
26 #define MII_BCM7XXX_AUX_MODE            0x1d
27 #define  MII_BCM7XX_64CLK_MDIO          BIT(12)
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_RXCONFIG_2                  MISC_ADDR(0x38, 2)
42 #define AFE_RX_LP_COUNTER               MISC_ADDR(0x38, 3)
43 #define AFE_TX_CONFIG                   MISC_ADDR(0x39, 0)
44 #define AFE_VDCA_ICTRL_0                MISC_ADDR(0x39, 1)
45 #define AFE_VDAC_OTHERS_0               MISC_ADDR(0x39, 3)
46 #define AFE_HPF_TRIM_OTHERS             MISC_ADDR(0x3a, 0)
47
48 static void r_rc_cal_reset(struct phy_device *phydev)
49 {
50         /* Reset R_CAL/RC_CAL Engine */
51         bcm_phy_write_exp(phydev, 0x00b0, 0x0010);
52
53         /* Disable Reset R_AL/RC_CAL Engine */
54         bcm_phy_write_exp(phydev, 0x00b0, 0x0000);
55 }
56
57 static int bcm7xxx_28nm_b0_afe_config_init(struct phy_device *phydev)
58 {
59         /* Increase VCO range to prevent unlocking problem of PLL at low
60          * temp
61          */
62         bcm_phy_write_misc(phydev, PLL_PLLCTRL_1, 0x0048);
63
64         /* Change Ki to 011 */
65         bcm_phy_write_misc(phydev, PLL_PLLCTRL_2, 0x021b);
66
67         /* Disable loading of TVCO buffer to bandgap, set bandgap trim
68          * to 111
69          */
70         bcm_phy_write_misc(phydev, PLL_PLLCTRL_4, 0x0e20);
71
72         /* Adjust bias current trim by -3 */
73         bcm_phy_write_misc(phydev, DSP_TAP10, 0x690b);
74
75         /* Switch to CORE_BASE1E */
76         phy_write(phydev, MII_BRCM_CORE_BASE1E, 0xd);
77
78         r_rc_cal_reset(phydev);
79
80         /* write AFE_RXCONFIG_0 */
81         bcm_phy_write_misc(phydev, AFE_RXCONFIG_0, 0xeb19);
82
83         /* write AFE_RXCONFIG_1 */
84         bcm_phy_write_misc(phydev, AFE_RXCONFIG_1, 0x9a3f);
85
86         /* write AFE_RX_LP_COUNTER */
87         bcm_phy_write_misc(phydev, AFE_RX_LP_COUNTER, 0x7fc0);
88
89         /* write AFE_HPF_TRIM_OTHERS */
90         bcm_phy_write_misc(phydev, AFE_HPF_TRIM_OTHERS, 0x000b);
91
92         /* write AFTE_TX_CONFIG */
93         bcm_phy_write_misc(phydev, AFE_TX_CONFIG, 0x0800);
94
95         return 0;
96 }
97
98 static int bcm7xxx_28nm_d0_afe_config_init(struct phy_device *phydev)
99 {
100         /* AFE_RXCONFIG_0 */
101         bcm_phy_write_misc(phydev, AFE_RXCONFIG_0, 0xeb15);
102
103         /* AFE_RXCONFIG_1 */
104         bcm_phy_write_misc(phydev, AFE_RXCONFIG_1, 0x9b2f);
105
106         /* AFE_RXCONFIG_2, set rCal offset for HT=0 code and LT=-2 code */
107         bcm_phy_write_misc(phydev, AFE_RXCONFIG_2, 0x2003);
108
109         /* AFE_RX_LP_COUNTER, set RX bandwidth to maximum */
110         bcm_phy_write_misc(phydev, AFE_RX_LP_COUNTER, 0x7fc0);
111
112         /* AFE_TX_CONFIG, set 100BT Cfeed=011 to improve rise/fall time */
113         bcm_phy_write_misc(phydev, AFE_TX_CONFIG, 0x431);
114
115         /* AFE_VDCA_ICTRL_0, set Iq=1101 instead of 0111 for AB symmetry */
116         bcm_phy_write_misc(phydev, AFE_VDCA_ICTRL_0, 0xa7da);
117
118         /* AFE_VDAC_OTHERS_0, set 1000BT Cidac=010 for all ports */
119         bcm_phy_write_misc(phydev, AFE_VDAC_OTHERS_0, 0xa020);
120
121         /* AFE_HPF_TRIM_OTHERS, set 100Tx/10BT to -4.5% swing and set rCal
122          * offset for HT=0 code
123          */
124         bcm_phy_write_misc(phydev, AFE_HPF_TRIM_OTHERS, 0x00e3);
125
126         /* CORE_BASE1E, force trim to overwrite and set I_ext trim to 0000 */
127         phy_write(phydev, MII_BRCM_CORE_BASE1E, 0x0010);
128
129         /* DSP_TAP10, adjust bias current trim (+0% swing, +0 tick) */
130         bcm_phy_write_misc(phydev, DSP_TAP10, 0x011b);
131
132         /* Reset R_CAL/RC_CAL engine */
133         r_rc_cal_reset(phydev);
134
135         return 0;
136 }
137
138 static int bcm7xxx_28nm_e0_plus_afe_config_init(struct phy_device *phydev)
139 {
140         /* AFE_RXCONFIG_1, provide more margin for INL/DNL measurement */
141         bcm_phy_write_misc(phydev, AFE_RXCONFIG_1, 0x9b2f);
142
143         /* AFE_TX_CONFIG, set 100BT Cfeed=011 to improve rise/fall time */
144         bcm_phy_write_misc(phydev, AFE_TX_CONFIG, 0x431);
145
146         /* AFE_VDCA_ICTRL_0, set Iq=1101 instead of 0111 for AB symmetry */
147         bcm_phy_write_misc(phydev, AFE_VDCA_ICTRL_0, 0xa7da);
148
149         /* AFE_HPF_TRIM_OTHERS, set 100Tx/10BT to -4.5% swing and set rCal
150          * offset for HT=0 code
151          */
152         bcm_phy_write_misc(phydev, AFE_HPF_TRIM_OTHERS, 0x00e3);
153
154         /* CORE_BASE1E, force trim to overwrite and set I_ext trim to 0000 */
155         phy_write(phydev, MII_BRCM_CORE_BASE1E, 0x0010);
156
157         /* DSP_TAP10, adjust bias current trim (+0% swing, +0 tick) */
158         bcm_phy_write_misc(phydev, DSP_TAP10, 0x011b);
159
160         /* Reset R_CAL/RC_CAL engine */
161         r_rc_cal_reset(phydev);
162
163         return 0;
164 }
165
166 static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
167 {
168         u8 rev = PHY_BRCM_7XXX_REV(phydev->dev_flags);
169         u8 patch = PHY_BRCM_7XXX_PATCH(phydev->dev_flags);
170         int ret = 0;
171
172         pr_info_once("%s: %s PHY revision: 0x%02x, patch: %d\n",
173                      dev_name(&phydev->dev), phydev->drv->name, rev, patch);
174
175         /* Dummy read to a register to workaround an issue upon reset where the
176          * internal inverter may not allow the first MDIO transaction to pass
177          * the MDIO management controller and make us return 0xffff for such
178          * reads.
179          */
180         phy_read(phydev, MII_BMSR);
181
182         switch (rev) {
183         case 0xb0:
184                 ret = bcm7xxx_28nm_b0_afe_config_init(phydev);
185                 break;
186         case 0xd0:
187                 ret = bcm7xxx_28nm_d0_afe_config_init(phydev);
188                 break;
189         case 0xe0:
190         case 0xf0:
191         /* Rev G0 introduces a roll over */
192         case 0x10:
193                 ret = bcm7xxx_28nm_e0_plus_afe_config_init(phydev);
194                 break;
195         default:
196                 break;
197         }
198
199         if (ret)
200                 return ret;
201
202         ret = bcm_phy_enable_eee(phydev);
203         if (ret)
204                 return ret;
205
206         return bcm_phy_enable_apd(phydev, true);
207 }
208
209 static int bcm7xxx_28nm_resume(struct phy_device *phydev)
210 {
211         int ret;
212
213         /* Re-apply workarounds coming out suspend/resume */
214         ret = bcm7xxx_28nm_config_init(phydev);
215         if (ret)
216                 return ret;
217
218         /* 28nm Gigabit PHYs come out of reset without any half-duplex
219          * or "hub" compliant advertised mode, fix that. This does not
220          * cause any problems with the PHY library since genphy_config_aneg()
221          * gracefully handles auto-negotiated and forced modes.
222          */
223         return genphy_config_aneg(phydev);
224 }
225
226 static int phy_set_clr_bits(struct phy_device *dev, int location,
227                                         int set_mask, int clr_mask)
228 {
229         int v, ret;
230
231         v = phy_read(dev, location);
232         if (v < 0)
233                 return v;
234
235         v &= ~clr_mask;
236         v |= set_mask;
237
238         ret = phy_write(dev, location, v);
239         if (ret < 0)
240                 return ret;
241
242         return v;
243 }
244
245 static int bcm7xxx_config_init(struct phy_device *phydev)
246 {
247         int ret;
248
249         /* Enable 64 clock MDIO */
250         phy_write(phydev, MII_BCM7XXX_AUX_MODE, MII_BCM7XX_64CLK_MDIO);
251         phy_read(phydev, MII_BCM7XXX_AUX_MODE);
252
253         /* Workaround only required for 100Mbits/sec capable PHYs */
254         if (phydev->supported & PHY_GBIT_FEATURES)
255                 return 0;
256
257         /* set shadow mode 2 */
258         ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST,
259                         MII_BCM7XXX_SHD_MODE_2, MII_BCM7XXX_SHD_MODE_2);
260         if (ret < 0)
261                 return ret;
262
263         /* set iddq_clkbias */
264         phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0F00);
265         udelay(10);
266
267         /* reset iddq_clkbias */
268         phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0C00);
269
270         phy_write(phydev, MII_BCM7XXX_100TX_FALSE_CAR, 0x7555);
271
272         /* reset shadow mode 2 */
273         ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST, MII_BCM7XXX_SHD_MODE_2, 0);
274         if (ret < 0)
275                 return ret;
276
277         return 0;
278 }
279
280 /* Workaround for putting the PHY in IDDQ mode, required
281  * for all BCM7XXX 40nm and 65nm PHYs
282  */
283 static int bcm7xxx_suspend(struct phy_device *phydev)
284 {
285         int ret;
286         const struct bcm7xxx_regs {
287                 int reg;
288                 u16 value;
289         } bcm7xxx_suspend_cfg[] = {
290                 { MII_BCM7XXX_TEST, 0x008b },
291                 { MII_BCM7XXX_100TX_AUX_CTL, 0x01c0 },
292                 { MII_BCM7XXX_100TX_DISC, 0x7000 },
293                 { MII_BCM7XXX_TEST, 0x000f },
294                 { MII_BCM7XXX_100TX_AUX_CTL, 0x20d0 },
295                 { MII_BCM7XXX_TEST, 0x000b },
296         };
297         unsigned int i;
298
299         for (i = 0; i < ARRAY_SIZE(bcm7xxx_suspend_cfg); i++) {
300                 ret = phy_write(phydev,
301                                 bcm7xxx_suspend_cfg[i].reg,
302                                 bcm7xxx_suspend_cfg[i].value);
303                 if (ret)
304                         return ret;
305         }
306
307         return 0;
308 }
309
310 static int bcm7xxx_dummy_config_init(struct phy_device *phydev)
311 {
312         return 0;
313 }
314
315 #define BCM7XXX_28NM_GPHY(_oui, _name)                                  \
316 {                                                                       \
317         .phy_id         = (_oui),                                       \
318         .phy_id_mask    = 0xfffffff0,                                   \
319         .name           = _name,                                        \
320         .features       = PHY_GBIT_FEATURES |                           \
321                           SUPPORTED_Pause | SUPPORTED_Asym_Pause,       \
322         .flags          = PHY_IS_INTERNAL,                              \
323         .config_init    = bcm7xxx_28nm_config_init,                     \
324         .config_aneg    = genphy_config_aneg,                           \
325         .read_status    = genphy_read_status,                           \
326         .resume         = bcm7xxx_28nm_resume,                          \
327         .driver         = { .owner = THIS_MODULE },                     \
328 }
329
330 static struct phy_driver bcm7xxx_driver[] = {
331         BCM7XXX_28NM_GPHY(PHY_ID_BCM7250, "Broadcom BCM7250"),
332         BCM7XXX_28NM_GPHY(PHY_ID_BCM7364, "Broadcom BCM7364"),
333         BCM7XXX_28NM_GPHY(PHY_ID_BCM7366, "Broadcom BCM7366"),
334         BCM7XXX_28NM_GPHY(PHY_ID_BCM7439, "Broadcom BCM7439"),
335         BCM7XXX_28NM_GPHY(PHY_ID_BCM7439_2, "Broadcom BCM7439 (2)"),
336         BCM7XXX_28NM_GPHY(PHY_ID_BCM7445, "Broadcom BCM7445"),
337 {
338         .phy_id         = PHY_ID_BCM7425,
339         .phy_id_mask    = 0xfffffff0,
340         .name           = "Broadcom BCM7425",
341         .features       = PHY_GBIT_FEATURES |
342                           SUPPORTED_Pause | SUPPORTED_Asym_Pause,
343         .flags          = PHY_IS_INTERNAL,
344         .config_init    = bcm7xxx_config_init,
345         .config_aneg    = genphy_config_aneg,
346         .read_status    = genphy_read_status,
347         .suspend        = bcm7xxx_suspend,
348         .resume         = bcm7xxx_config_init,
349         .driver         = { .owner = THIS_MODULE },
350 }, {
351         .phy_id         = PHY_ID_BCM7429,
352         .phy_id_mask    = 0xfffffff0,
353         .name           = "Broadcom BCM7429",
354         .features       = PHY_GBIT_FEATURES |
355                           SUPPORTED_Pause | SUPPORTED_Asym_Pause,
356         .flags          = PHY_IS_INTERNAL,
357         .config_init    = bcm7xxx_config_init,
358         .config_aneg    = genphy_config_aneg,
359         .read_status    = genphy_read_status,
360         .suspend        = bcm7xxx_suspend,
361         .resume         = bcm7xxx_config_init,
362         .driver         = { .owner = THIS_MODULE },
363 }, {
364         .phy_id         = PHY_BCM_OUI_4,
365         .phy_id_mask    = 0xffff0000,
366         .name           = "Broadcom BCM7XXX 40nm",
367         .features       = PHY_GBIT_FEATURES |
368                           SUPPORTED_Pause | SUPPORTED_Asym_Pause,
369         .flags          = PHY_IS_INTERNAL,
370         .config_init    = bcm7xxx_config_init,
371         .config_aneg    = genphy_config_aneg,
372         .read_status    = genphy_read_status,
373         .suspend        = bcm7xxx_suspend,
374         .resume         = bcm7xxx_config_init,
375         .driver         = { .owner = THIS_MODULE },
376 }, {
377         .phy_id         = PHY_BCM_OUI_5,
378         .phy_id_mask    = 0xffffff00,
379         .name           = "Broadcom BCM7XXX 65nm",
380         .features       = PHY_BASIC_FEATURES |
381                           SUPPORTED_Pause | SUPPORTED_Asym_Pause,
382         .flags          = PHY_IS_INTERNAL,
383         .config_init    = bcm7xxx_dummy_config_init,
384         .config_aneg    = genphy_config_aneg,
385         .read_status    = genphy_read_status,
386         .suspend        = bcm7xxx_suspend,
387         .resume         = bcm7xxx_config_init,
388         .driver         = { .owner = THIS_MODULE },
389 } };
390
391 static struct mdio_device_id __maybe_unused bcm7xxx_tbl[] = {
392         { PHY_ID_BCM7250, 0xfffffff0, },
393         { PHY_ID_BCM7364, 0xfffffff0, },
394         { PHY_ID_BCM7366, 0xfffffff0, },
395         { PHY_ID_BCM7425, 0xfffffff0, },
396         { PHY_ID_BCM7429, 0xfffffff0, },
397         { PHY_ID_BCM7439, 0xfffffff0, },
398         { PHY_ID_BCM7445, 0xfffffff0, },
399         { PHY_BCM_OUI_4, 0xffff0000 },
400         { PHY_BCM_OUI_5, 0xffffff00 },
401         { }
402 };
403
404 module_phy_driver(bcm7xxx_driver);
405
406 MODULE_DEVICE_TABLE(mdio, bcm7xxx_tbl);
407
408 MODULE_DESCRIPTION("Broadcom BCM7xxx internal PHY driver");
409 MODULE_LICENSE("GPL");
410 MODULE_AUTHOR("Broadcom Corporation");