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 #include <mach/msm_gpiomux.h>
23 #include "gpiomux-v1.h"
24
25 /**
26 * struct msm_gpiomux_config: gpiomux settings for one gpio line.
27 *
28 * A complete gpiomux config is the bitwise-or of a drive-strength,
29 * function, and pull. For functions other than GPIO, the OE
30 * is hard-wired according to the function. For GPIO mode,
31 * OE is controlled by gpiolib.
32 *
33 * Available settings differ by target; see the gpiomux header
34 * specific to your target arch for available configurations.
35 *
36 * @active: The configuration to be installed when the line is
37 * active, or its reference count is > 0.
38 * @suspended: The configuration to be installed when the line
39 * is suspended, or its reference count is 0.
40 * @ref: The reference count of the line. For internal use of
41 * the gpiomux framework only.
42 */
43 struct msm_gpiomux_config {
44 gpiomux_config_t active;
45 gpiomux_config_t suspended;
46 unsigned ref;
47 };
48
49 /**
50 * @GPIOMUX_VALID: If set, the config field contains 'good data'.
51 * The absence of this bit will prevent the gpiomux
52 * system from applying the configuration under all
53 * circumstances.
54 */
55 enum {
56 GPIOMUX_VALID = BIT(sizeof(gpiomux_config_t) * BITS_PER_BYTE - 1),
57 GPIOMUX_CTL_MASK = GPIOMUX_VALID,
58 };
59
60 #ifdef CONFIG_MSM_GPIOMUX
61
62 /* Each architecture must provide its own instance of this table.
63 * To avoid having gpiomux manage any given gpio, one or both of
64 * the entries can avoid setting GPIOMUX_VALID - the absence
65 * of that flag will prevent the configuration from being applied
66 * during state transitions.
67 */
68 extern struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS];
69
70 /* Install a new configuration to the gpio line. To avoid overwriting
71 * a configuration, leave the VALID bit out.
72 */
73 int msm_gpiomux_write(unsigned gpio,
74 gpiomux_config_t active,
75 gpiomux_config_t suspended);
76 #else
msm_gpiomux_write(unsigned gpio,gpiomux_config_t active,gpiomux_config_t suspended)77 static inline int msm_gpiomux_write(unsigned gpio,
78 gpiomux_config_t active,
79 gpiomux_config_t suspended)
80 {
81 return -ENOSYS;
82 }
83 #endif
84 #endif
85