summaryrefslogtreecommitdiff
path: root/arch/arm/cpu/armv7/tegra2/funcmux.c
blob: c1d2dfec5f02dea5c8631ca9222c3d7be13cb486 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*
 * Copyright (c) 2011 The Chromium OS Authors.
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/* Tegra2 high-level function multiplexing */
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/funcmux.h>
#include <asm/arch/pinmux.h>

int funcmux_select(enum periph_id id, int config)
{
	int bad_config = config != FUNCMUX_DEFAULT;

	switch (id) {
	case PERIPH_ID_UART1:
		if (config == FUNCMUX_UART1_IRRX_IRTX) {
			pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA);
			pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA);
			pinmux_tristate_disable(PINGRP_IRRX);
			pinmux_tristate_disable(PINGRP_IRTX);
			/*
			 * Tegra appears to boot with function UARTA pre-
			 * selected on mux group SDB. If two mux groups are
			 * both set to the same function, it's unclear which
			 * group's pins drive the RX signals into the HW.
			 * For UARTA, SDB certainly overrides group IRTX in
			 * practice. To solve this, configure some alternative
			 * function on SDB to avoid the conflict. Also, tri-
			 * state the group to avoid driving any signal onto it
			 * until we know what's connected.
			 */
			pinmux_tristate_enable(PINGRP_SDB);
			pinmux_set_func(PINGRP_SDB,  PMUX_FUNC_SDIO3);
		}
		break;

	case PERIPH_ID_UART2:
		if (config == FUNCMUX_UART2_IRDA) {
			pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
			pinmux_tristate_disable(PINGRP_UAD);
		}
		break;

	case PERIPH_ID_UART4:
		if (config == FUNCMUX_UART4_GMC) {
			pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
			pinmux_tristate_disable(PINGRP_GMC);
		}
		break;

	case PERIPH_ID_DVC_I2C:
		/* there is only one selection, pinmux_config is ignored */
		if (config == FUNCMUX_DVC_I2CP) {
			pinmux_set_func(PINGRP_I2CP, PMUX_FUNC_I2C);
			pinmux_tristate_disable(PINGRP_I2CP);
		}
		break;

	case PERIPH_ID_I2C1:
		/* support pinmux_config of 0 for now, */
		if (config == FUNCMUX_I2C1_RM) {
			pinmux_set_func(PINGRP_RM, PMUX_FUNC_I2C);
			pinmux_tristate_disable(PINGRP_RM);
		}
		break;
	case PERIPH_ID_I2C2: /* I2C2 */
		switch (config) {
		case FUNCMUX_I2C2_DDC:	/* DDC pin group, select I2C2 */
			pinmux_set_func(PINGRP_DDC, PMUX_FUNC_I2C2);
			/* PTA to HDMI */
			pinmux_set_func(PINGRP_PTA, PMUX_FUNC_HDMI);
			pinmux_tristate_disable(PINGRP_DDC);
			break;
		case FUNCMUX_I2C2_PTA:	/* PTA pin group, select I2C2 */
			pinmux_set_func(PINGRP_PTA, PMUX_FUNC_I2C2);
			/* set DDC_SEL to RSVDx (RSVD2 works for now) */
			pinmux_set_func(PINGRP_DDC, PMUX_FUNC_RSVD2);
			pinmux_tristate_disable(PINGRP_PTA);
			bad_config = 0;
			break;
		}
		break;
	case PERIPH_ID_I2C3: /* I2C3 */
		/* support pinmux_config of 0 for now */
		if (config == FUNCMUX_I2C3_DTF) {
			pinmux_set_func(PINGRP_DTF, PMUX_FUNC_I2C3);
			pinmux_tristate_disable(PINGRP_DTF);
		}
		break;

	case PERIPH_ID_SDMMC2:
		if (config == FUNCMUX_SDMMC2_DTA_DTD_8BIT) {
			pinmux_set_func(PINGRP_DTA, PMUX_FUNC_SDIO2);
			pinmux_set_func(PINGRP_DTD, PMUX_FUNC_SDIO2);

			pinmux_tristate_disable(PINGRP_DTA);
			pinmux_tristate_disable(PINGRP_DTD);
		}
		break;

	case PERIPH_ID_SDMMC3:
		switch (config) {
		case FUNCMUX_SDMMC3_SDB_SLXA_8BIT:
			pinmux_set_func(PINGRP_SLXA, PMUX_FUNC_SDIO3);
			pinmux_set_func(PINGRP_SLXC, PMUX_FUNC_SDIO3);
			pinmux_set_func(PINGRP_SLXD, PMUX_FUNC_SDIO3);
			pinmux_set_func(PINGRP_SLXK, PMUX_FUNC_SDIO3);

			pinmux_tristate_disable(PINGRP_SLXA);
			pinmux_tristate_disable(PINGRP_SLXC);
			pinmux_tristate_disable(PINGRP_SLXD);
			pinmux_tristate_disable(PINGRP_SLXK);
			/* fall through */

		case FUNCMUX_SDMMC3_SDB_4BIT:
			pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
			pinmux_set_func(PINGRP_SDC, PMUX_FUNC_SDIO3);
			pinmux_set_func(PINGRP_SDD, PMUX_FUNC_SDIO3);

			pinmux_tristate_disable(PINGRP_SDB);
			pinmux_tristate_disable(PINGRP_SDC);
			pinmux_tristate_disable(PINGRP_SDD);
			bad_config = 0;
			break;
		}
		break;

	case PERIPH_ID_SDMMC4:
		switch (config) {
		case FUNCMUX_SDMMC4_ATC_ATD_8BIT:
			pinmux_set_func(PINGRP_ATC, PMUX_FUNC_SDIO4);
			pinmux_set_func(PINGRP_ATD, PMUX_FUNC_SDIO4);

			pinmux_tristate_disable(PINGRP_ATC);
			pinmux_tristate_disable(PINGRP_ATD);
			break;

		case FUNCMUX_SDMMC4_ATB_GMA_GME_8_BIT:
			pinmux_set_func(PINGRP_GME, PMUX_FUNC_SDIO4);
			pinmux_tristate_disable(PINGRP_GME);
			/* fall through */

		case FUNCMUX_SDMMC4_ATB_GMA_4_BIT:
			pinmux_set_func(PINGRP_ATB, PMUX_FUNC_SDIO4);
			pinmux_set_func(PINGRP_GMA, PMUX_FUNC_SDIO4);

			pinmux_tristate_disable(PINGRP_ATB);
			pinmux_tristate_disable(PINGRP_GMA);
			bad_config = 0;
			break;
		}
		break;

	default:
		debug("%s: invalid periph_id %d", __func__, id);
		return -1;
	}

	if (bad_config) {
		debug("%s: invalid config %d for periph_id %d", __func__,
		      config, id);
		return -1;
	}

	return 0;
}