197 lines
5.6 KiB
C
197 lines
5.6 KiB
C
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/* Copyright (c) 2010-2011,2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_H
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#define __ARCH_ARM_MACH_MSM_GPIOMUX_H
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#include <linux/bitops.h>
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#include <linux/errno.h>
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enum msm_gpiomux_setting {
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GPIOMUX_ACTIVE = 0,
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GPIOMUX_SUSPENDED,
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GPIOMUX_NSETTINGS
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};
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enum gpiomux_drv {
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GPIOMUX_DRV_2MA = 0,
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GPIOMUX_DRV_4MA,
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GPIOMUX_DRV_6MA,
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GPIOMUX_DRV_8MA,
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GPIOMUX_DRV_10MA,
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GPIOMUX_DRV_12MA,
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GPIOMUX_DRV_14MA,
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GPIOMUX_DRV_16MA,
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};
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enum gpiomux_func {
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GPIOMUX_FUNC_GPIO = 0,
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GPIOMUX_FUNC_1,
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GPIOMUX_FUNC_2,
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GPIOMUX_FUNC_3,
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GPIOMUX_FUNC_4,
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GPIOMUX_FUNC_5,
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GPIOMUX_FUNC_6,
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GPIOMUX_FUNC_7,
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GPIOMUX_FUNC_8,
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GPIOMUX_FUNC_9,
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GPIOMUX_FUNC_A,
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GPIOMUX_FUNC_B,
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GPIOMUX_FUNC_C,
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GPIOMUX_FUNC_D,
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GPIOMUX_FUNC_E,
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GPIOMUX_FUNC_F,
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};
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enum gpiomux_pull {
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GPIOMUX_PULL_NONE = 0,
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GPIOMUX_PULL_DOWN,
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GPIOMUX_PULL_KEEPER,
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GPIOMUX_PULL_UP,
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};
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/* Direction settings are only meaningful when GPIOMUX_FUNC_GPIO is selected.
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* This element is ignored for all other FUNC selections, as the output-
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* enable pin is not under software control in those cases. See the SWI
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* for your target for more details.
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*/
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enum gpiomux_dir {
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GPIOMUX_IN = 0,
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GPIOMUX_OUT_HIGH,
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GPIOMUX_OUT_LOW,
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};
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struct gpiomux_setting {
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enum gpiomux_func func;
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enum gpiomux_drv drv;
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enum gpiomux_pull pull;
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enum gpiomux_dir dir;
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};
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/**
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* struct msm_gpiomux_config: gpiomux settings for one gpio line.
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*
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* A complete gpiomux config is the combination of a drive-strength,
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* function, pull, and (sometimes) direction. For functions other than GPIO,
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* the input/output setting is hard-wired according to the function.
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*
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* @gpio: The index number of the gpio being described.
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* @settings: The settings to be installed, specifically:
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* GPIOMUX_ACTIVE: The setting to be installed when the
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* line is active, or its reference count is > 0.
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* GPIOMUX_SUSPENDED: The setting to be installed when
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* the line is suspended, or its reference count is 0.
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*/
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struct msm_gpiomux_config {
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unsigned gpio;
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struct gpiomux_setting *settings[GPIOMUX_NSETTINGS];
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};
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/**
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* struct msm_gpiomux_configs: a collection of gpiomux configs.
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*
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* It is so common to manage blocks of gpiomux configs that the data structure
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* for doing so has been standardized here as a convenience.
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*
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* @cfg: A pointer to the first config in an array of configs.
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* @ncfg: The number of configs in the array.
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*/
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struct msm_gpiomux_configs {
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struct msm_gpiomux_config *cfg;
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size_t ncfg;
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};
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/* Provide an enum and an API to write to misc TLMM registers */
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enum msm_tlmm_misc_reg {
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TLMM_ETM_MODE_REG = 0x2014,
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TLMM_SDC2_HDRV_PULL_CTL = 0x2048,
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};
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void msm_tlmm_misc_reg_write(enum msm_tlmm_misc_reg misc_reg, int val);
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#ifdef CONFIG_MSM_GPIOMUX
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/* Before using gpiomux, initialize the subsystem by telling it how many
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* gpios are going to be managed. Calling any other gpiomux functions before
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* msm_gpiomux_init is unsupported.
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*/
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int msm_gpiomux_init(size_t ngpio);
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/* DT Variant of msm_gpiomux_init. This will look up the number of gpios from
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* device tree rather than relying on NR_GPIO_IRQS
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*/
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int msm_gpiomux_init_dt(void);
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/* Install a block of gpiomux configurations in gpiomux. This is functionally
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* identical to calling msm_gpiomux_write many times.
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*/
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void msm_gpiomux_install(struct msm_gpiomux_config *configs, unsigned nconfigs);
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/* Install a block of gpiomux configurations in gpiomux. Do not however write
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* to hardware. Just store the settings to be retrieved at a later time
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*/
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void msm_gpiomux_install_nowrite(struct msm_gpiomux_config *configs,
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unsigned nconfigs);
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/* Increment a gpio's reference count, possibly activating the line. */
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int __must_check msm_gpiomux_get(unsigned gpio);
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/* Decrement a gpio's reference count, possibly suspending the line. */
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int msm_gpiomux_put(unsigned gpio);
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/* Install a new setting in a gpio. To erase a slot, use NULL.
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* The old setting that was overwritten can be passed back to the caller
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* old_setting can be NULL if the caller is not interested in the previous
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* setting
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* If a previous setting was not available to return (NULL configuration)
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* - the function returns 1
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* else function returns 0
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*/
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int msm_gpiomux_write(unsigned gpio, enum msm_gpiomux_setting which,
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struct gpiomux_setting *setting, struct gpiomux_setting *old_setting);
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/* Architecture-internal function for use by the framework only.
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* This function can assume the following:
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* - the gpio value has passed a bounds-check
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* - the gpiomux spinlock has been obtained
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*
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* This function is not for public consumption. External users
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* should use msm_gpiomux_write.
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*/
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void __msm_gpiomux_write(unsigned gpio, struct gpiomux_setting val);
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#else
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static inline int msm_gpiomux_init(size_t ngpio)
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{
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return -ENOSYS;
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}
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static inline void
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msm_gpiomux_install(struct msm_gpiomux_config *configs, unsigned nconfigs) {}
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static inline int __must_check msm_gpiomux_get(unsigned gpio)
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{
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return -ENOSYS;
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}
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static inline int msm_gpiomux_put(unsigned gpio)
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{
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return -ENOSYS;
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}
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static inline int msm_gpiomux_write(unsigned gpio,
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enum msm_gpiomux_setting which, struct gpiomux_setting *setting,
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struct gpiomux_setting *old_setting)
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{
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return -ENOSYS;
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}
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#endif
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#endif
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