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1/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15 * 02110-1301, USA.
16 */
17#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_H
18#define __ARCH_ARM_MACH_MSM_GPIOMUX_H
19
20#include <linux/bitops.h>
21#include <linux/errno.h>
22
23#if defined(CONFIG_MSM_V2_TLMM)
24#include "gpiomux-v2.h"
25#else
26#include "gpiomux-v1.h"
27#endif
28
29/**
30 * struct msm_gpiomux_config: gpiomux settings for one gpio line.
31 *
32 * A complete gpiomux config is the bitwise-or of a drive-strength,
33 * function, and pull. For functions other than GPIO, the OE
34 * is hard-wired according to the function. For GPIO mode,
35 * OE is controlled by gpiolib.
36 *
37 * Available settings differ by target; see the gpiomux header
38 * specific to your target arch for available configurations.
39 *
40 * @active: The configuration to be installed when the line is
41 * active, or its reference count is > 0.
42 * @suspended: The configuration to be installed when the line
43 * is suspended, or its reference count is 0.
44 * @ref: The reference count of the line. For internal use of
45 * the gpiomux framework only.
46 */
47struct msm_gpiomux_config {
48 gpiomux_config_t active;
49 gpiomux_config_t suspended;
50 unsigned ref;
51};
52
53/**
54 * @GPIOMUX_VALID: If set, the config field contains 'good data'.
55 * The absence of this bit will prevent the gpiomux
56 * system from applying the configuration under all
57 * circumstances.
58 */
59enum {
60 GPIOMUX_VALID = BIT(sizeof(gpiomux_config_t) * BITS_PER_BYTE - 1),
61 GPIOMUX_CTL_MASK = GPIOMUX_VALID,
62};
63
64#ifdef CONFIG_MSM_GPIOMUX
65
66/* Each architecture must provide its own instance of this table.
67 * To avoid having gpiomux manage any given gpio, one or both of
68 * the entries can avoid setting GPIOMUX_VALID - the absence
69 * of that flag will prevent the configuration from being applied
70 * during state transitions.
71 */
72extern struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS];
73
74/* Increment a gpio's reference count, possibly activating the line. */
75int __must_check msm_gpiomux_get(unsigned gpio);
76
77/* Decrement a gpio's reference count, possibly suspending the line. */
78int msm_gpiomux_put(unsigned gpio);
79
80/* Install a new configuration to the gpio line. To avoid overwriting
81 * a configuration, leave the VALID bit out.
82 */
83int msm_gpiomux_write(unsigned gpio,
84 gpiomux_config_t active,
85 gpiomux_config_t suspended);
86
87/* Architecture-internal function for use by the framework only.
88 * This function can assume the following:
89 * - the gpio value has passed a bounds-check
90 * - the gpiomux spinlock has been obtained
91 *
92 * This function is not for public consumption. External users
93 * should use msm_gpiomux_write.
94 */
95void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val);
96#else
97static inline int __must_check msm_gpiomux_get(unsigned gpio)
98{
99 return -ENOSYS;
100}
101
102static inline int msm_gpiomux_put(unsigned gpio)
103{
104 return -ENOSYS;
105}
106
107static inline int msm_gpiomux_write(unsigned gpio,
108 gpiomux_config_t active,
109 gpiomux_config_t suspended)
110{
111 return -ENOSYS;
112}
113#endif
114#endif