115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only version 2 as published by the Free Software Foundation.
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*/
|
|
#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_H
|
|
#define __ARCH_ARM_MACH_MSM_GPIOMUX_H
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/errno.h>
|
|
|
|
#if defined(CONFIG_MSM_V2_TLMM)
|
|
#include "gpiomux-v2.h"
|
|
#else
|
|
#include "gpiomux-v1.h"
|
|
#endif
|
|
|
|
/**
|
|
* struct msm_gpiomux_config: gpiomux settings for one gpio line.
|
|
*
|
|
* A complete gpiomux config is the bitwise-or of a drive-strength,
|
|
* function, and pull. For functions other than GPIO, the OE
|
|
* is hard-wired according to the function. For GPIO mode,
|
|
* OE is controlled by gpiolib.
|
|
*
|
|
* Available settings differ by target; see the gpiomux header
|
|
* specific to your target arch for available configurations.
|
|
*
|
|
* @active: The configuration to be installed when the line is
|
|
* active, or its reference count is > 0.
|
|
* @suspended: The configuration to be installed when the line
|
|
* is suspended, or its reference count is 0.
|
|
* @ref: The reference count of the line. For internal use of
|
|
* the gpiomux framework only.
|
|
*/
|
|
struct msm_gpiomux_config {
|
|
gpiomux_config_t active;
|
|
gpiomux_config_t suspended;
|
|
unsigned ref;
|
|
};
|
|
|
|
/**
|
|
* @GPIOMUX_VALID: If set, the config field contains 'good data'.
|
|
* The absence of this bit will prevent the gpiomux
|
|
* system from applying the configuration under all
|
|
* circumstances.
|
|
*/
|
|
enum {
|
|
GPIOMUX_VALID = BIT(sizeof(gpiomux_config_t) * BITS_PER_BYTE - 1),
|
|
GPIOMUX_CTL_MASK = GPIOMUX_VALID,
|
|
};
|
|
|
|
#ifdef CONFIG_MSM_GPIOMUX
|
|
|
|
/* Each architecture must provide its own instance of this table.
|
|
* To avoid having gpiomux manage any given gpio, one or both of
|
|
* the entries can avoid setting GPIOMUX_VALID - the absence
|
|
* of that flag will prevent the configuration from being applied
|
|
* during state transitions.
|
|
*/
|
|
extern struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS];
|
|
|
|
/* Increment a gpio's reference count, possibly activating the line. */
|
|
int __must_check msm_gpiomux_get(unsigned gpio);
|
|
|
|
/* Decrement a gpio's reference count, possibly suspending the line. */
|
|
int msm_gpiomux_put(unsigned gpio);
|
|
|
|
/* Install a new configuration to the gpio line. To avoid overwriting
|
|
* a configuration, leave the VALID bit out.
|
|
*/
|
|
int msm_gpiomux_write(unsigned gpio,
|
|
gpiomux_config_t active,
|
|
gpiomux_config_t suspended);
|
|
|
|
/* Architecture-internal function for use by the framework only.
|
|
* This function can assume the following:
|
|
* - the gpio value has passed a bounds-check
|
|
* - the gpiomux spinlock has been obtained
|
|
*
|
|
* This function is not for public consumption. External users
|
|
* should use msm_gpiomux_write.
|
|
*/
|
|
void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val);
|
|
#else
|
|
static inline int __must_check msm_gpiomux_get(unsigned gpio)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int msm_gpiomux_put(unsigned gpio)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int msm_gpiomux_write(unsigned gpio,
|
|
gpiomux_config_t active,
|
|
gpiomux_config_t suspended)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
#endif
|