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
24 #if defined(CONFIG_MSM_V2_TLMM)
25 #include "gpiomux-v2.h"
26 #else
27 #include "gpiomux-v1.h"
28 #endif
29
30 /**
31 * struct msm_gpiomux_config: gpiomux settings for one gpio line.
32 *
33 * A complete gpiomux config is the bitwise-or of a drive-strength,
34 * function, and pull. For functions other than GPIO, the OE
35 * is hard-wired according to the function. For GPIO mode,
36 * OE is controlled by gpiolib.
37 *
38 * Available settings differ by target; see the gpiomux header
39 * specific to your target arch for available configurations.
40 *
41 * @active: The configuration to be installed when the line is
42 * active, or its reference count is > 0.
43 * @suspended: The configuration to be installed when the line
44 * is suspended, or its reference count is 0.
45 * @ref: The reference count of the line. For internal use of
46 * the gpiomux framework only.
47 */
48 struct msm_gpiomux_config {
49 gpiomux_config_t active;
50 gpiomux_config_t suspended;
51 unsigned ref;
52 };
53
54 /**
55 * @GPIOMUX_VALID: If set, the config field contains 'good data'.
56 * The absence of this bit will prevent the gpiomux
57 * system from applying the configuration under all
58 * circumstances.
59 */
60 enum {
61 GPIOMUX_VALID = BIT(sizeof(gpiomux_config_t) * BITS_PER_BYTE - 1),
62 GPIOMUX_CTL_MASK = GPIOMUX_VALID,
63 };
64
65 #ifdef CONFIG_MSM_GPIOMUX
66
67 /* Each architecture must provide its own instance of this table.
68 * To avoid having gpiomux manage any given gpio, one or both of
69 * the entries can avoid setting GPIOMUX_VALID - the absence
70 * of that flag will prevent the configuration from being applied
71 * during state transitions.
72 */
73 extern struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS];
74
75 /* Install a new configuration to the gpio line. To avoid overwriting
76 * a configuration, leave the VALID bit out.
77 */
78 int msm_gpiomux_write(unsigned gpio,
79 gpiomux_config_t active,
80 gpiomux_config_t suspended);
81
82 /* Architecture-internal function for use by the framework only.
83 * This function can assume the following:
84 * - the gpio value has passed a bounds-check
85 * - the gpiomux spinlock has been obtained
86 *
87 * This function is not for public consumption. External users
88 * should use msm_gpiomux_write.
89 */
90 void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val);
91 #else
msm_gpiomux_write(unsigned gpio,gpiomux_config_t active,gpiomux_config_t suspended)92 static inline int msm_gpiomux_write(unsigned gpio,
93 gpiomux_config_t active,
94 gpiomux_config_t suspended)
95 {
96 return -ENOSYS;
97 }
98 #endif
99 #endif
100