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Unified codebase for TX28, TX48, TX51, TX53
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1 /*
2  * Copyright (c) 2011 The Chromium OS Authors.
3  * See file CREDITS for list of people who contributed to this
4  * project.
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 as
8  * published by the Free Software Foundation; either version 2 of
9  * the License, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
19  * MA 02111-1307 USA
20  */
21
22 /* Tegra2 high-level function multiplexing */
23 #include <common.h>
24 #include <asm/arch/clock.h>
25 #include <asm/arch/funcmux.h>
26 #include <asm/arch/pinmux.h>
27
28 int funcmux_select(enum periph_id id, int config)
29 {
30         int bad_config = config != FUNCMUX_DEFAULT;
31
32         switch (id) {
33         case PERIPH_ID_UART1:
34                 if (config == FUNCMUX_UART1_IRRX_IRTX) {
35                         pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA);
36                         pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA);
37                         pinmux_tristate_disable(PINGRP_IRRX);
38                         pinmux_tristate_disable(PINGRP_IRTX);
39                         /*
40                          * Tegra appears to boot with function UARTA pre-
41                          * selected on mux group SDB. If two mux groups are
42                          * both set to the same function, it's unclear which
43                          * group's pins drive the RX signals into the HW.
44                          * For UARTA, SDB certainly overrides group IRTX in
45                          * practice. To solve this, configure some alternative
46                          * function on SDB to avoid the conflict. Also, tri-
47                          * state the group to avoid driving any signal onto it
48                          * until we know what's connected.
49                          */
50                         pinmux_tristate_enable(PINGRP_SDB);
51                         pinmux_set_func(PINGRP_SDB,  PMUX_FUNC_SDIO3);
52                 }
53                 break;
54
55         case PERIPH_ID_UART2:
56                 if (config == FUNCMUX_UART2_IRDA) {
57                         pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
58                         pinmux_tristate_disable(PINGRP_UAD);
59                 }
60                 break;
61
62         case PERIPH_ID_UART4:
63                 if (config == FUNCMUX_UART4_GMC) {
64                         pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
65                         pinmux_tristate_disable(PINGRP_GMC);
66                 }
67                 break;
68
69         case PERIPH_ID_DVC_I2C:
70                 /* there is only one selection, pinmux_config is ignored */
71                 if (config == FUNCMUX_DVC_I2CP) {
72                         pinmux_set_func(PINGRP_I2CP, PMUX_FUNC_I2C);
73                         pinmux_tristate_disable(PINGRP_I2CP);
74                 }
75                 break;
76
77         case PERIPH_ID_I2C1:
78                 /* support pinmux_config of 0 for now, */
79                 if (config == FUNCMUX_I2C1_RM) {
80                         pinmux_set_func(PINGRP_RM, PMUX_FUNC_I2C);
81                         pinmux_tristate_disable(PINGRP_RM);
82                 }
83                 break;
84         case PERIPH_ID_I2C2: /* I2C2 */
85                 switch (config) {
86                 case FUNCMUX_I2C2_DDC:  /* DDC pin group, select I2C2 */
87                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_I2C2);
88                         /* PTA to HDMI */
89                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_HDMI);
90                         pinmux_tristate_disable(PINGRP_DDC);
91                         break;
92                 case FUNCMUX_I2C2_PTA:  /* PTA pin group, select I2C2 */
93                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_I2C2);
94                         /* set DDC_SEL to RSVDx (RSVD2 works for now) */
95                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_RSVD2);
96                         pinmux_tristate_disable(PINGRP_PTA);
97                         bad_config = 0;
98                         break;
99                 }
100                 break;
101         case PERIPH_ID_I2C3: /* I2C3 */
102                 /* support pinmux_config of 0 for now */
103                 if (config == FUNCMUX_I2C3_DTF) {
104                         pinmux_set_func(PINGRP_DTF, PMUX_FUNC_I2C3);
105                         pinmux_tristate_disable(PINGRP_DTF);
106                 }
107                 break;
108
109         case PERIPH_ID_SDMMC2:
110                 if (config == FUNCMUX_SDMMC2_DTA_DTD_8BIT) {
111                         pinmux_set_func(PINGRP_DTA, PMUX_FUNC_SDIO2);
112                         pinmux_set_func(PINGRP_DTD, PMUX_FUNC_SDIO2);
113
114                         pinmux_tristate_disable(PINGRP_DTA);
115                         pinmux_tristate_disable(PINGRP_DTD);
116                 }
117                 break;
118
119         case PERIPH_ID_SDMMC3:
120                 switch (config) {
121                 case FUNCMUX_SDMMC3_SDB_SLXA_8BIT:
122                         pinmux_set_func(PINGRP_SLXA, PMUX_FUNC_SDIO3);
123                         pinmux_set_func(PINGRP_SLXC, PMUX_FUNC_SDIO3);
124                         pinmux_set_func(PINGRP_SLXD, PMUX_FUNC_SDIO3);
125                         pinmux_set_func(PINGRP_SLXK, PMUX_FUNC_SDIO3);
126
127                         pinmux_tristate_disable(PINGRP_SLXA);
128                         pinmux_tristate_disable(PINGRP_SLXC);
129                         pinmux_tristate_disable(PINGRP_SLXD);
130                         pinmux_tristate_disable(PINGRP_SLXK);
131                         /* fall through */
132
133                 case FUNCMUX_SDMMC3_SDB_4BIT:
134                         pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
135                         pinmux_set_func(PINGRP_SDC, PMUX_FUNC_SDIO3);
136                         pinmux_set_func(PINGRP_SDD, PMUX_FUNC_SDIO3);
137
138                         pinmux_tristate_disable(PINGRP_SDB);
139                         pinmux_tristate_disable(PINGRP_SDC);
140                         pinmux_tristate_disable(PINGRP_SDD);
141                         bad_config = 0;
142                         break;
143                 }
144                 break;
145
146         case PERIPH_ID_SDMMC4:
147                 switch (config) {
148                 case FUNCMUX_SDMMC4_ATC_ATD_8BIT:
149                         pinmux_set_func(PINGRP_ATC, PMUX_FUNC_SDIO4);
150                         pinmux_set_func(PINGRP_ATD, PMUX_FUNC_SDIO4);
151
152                         pinmux_tristate_disable(PINGRP_ATC);
153                         pinmux_tristate_disable(PINGRP_ATD);
154                         break;
155
156                 case FUNCMUX_SDMMC4_ATB_GMA_GME_8_BIT:
157                         pinmux_set_func(PINGRP_GME, PMUX_FUNC_SDIO4);
158                         pinmux_tristate_disable(PINGRP_GME);
159                         /* fall through */
160
161                 case FUNCMUX_SDMMC4_ATB_GMA_4_BIT:
162                         pinmux_set_func(PINGRP_ATB, PMUX_FUNC_SDIO4);
163                         pinmux_set_func(PINGRP_GMA, PMUX_FUNC_SDIO4);
164
165                         pinmux_tristate_disable(PINGRP_ATB);
166                         pinmux_tristate_disable(PINGRP_GMA);
167                         bad_config = 0;
168                         break;
169                 }
170                 break;
171
172         case PERIPH_ID_KBC:
173                 if (config == FUNCMUX_DEFAULT) {
174                         enum pmux_pingrp grp[] = {PINGRP_KBCA, PINGRP_KBCB,
175                                 PINGRP_KBCC, PINGRP_KBCD, PINGRP_KBCE,
176                                 PINGRP_KBCF};
177                         int i;
178
179                         for (i = 0; i < ARRAY_SIZE(grp); i++) {
180                                 pinmux_tristate_disable(grp[i]);
181                                 pinmux_set_func(grp[i], PMUX_FUNC_KBC);
182                                 pinmux_set_pullupdown(grp[i], PMUX_PULL_UP);
183                         }
184
185                         break;
186                 }
187
188         default:
189                 debug("%s: invalid periph_id %d", __func__, id);
190                 return -1;
191         }
192
193         if (bad_config) {
194                 debug("%s: invalid config %d for periph_id %d", __func__,
195                       config, id);
196                 return -1;
197         }
198
199         return 0;
200 }