release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-msm/include/mach/gpio.h

   1 /*
   2  * Copyright (C) 2007 Google, Inc.
   3  * Copyright (c) 2009-2010, Code Aurora Forum. All rights reserved.
   4  * Author: Mike Lockwood <lockwood@android.com>
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16 #ifndef __ASM_ARCH_MSM_GPIO_H
  17 #define __ASM_ARCH_MSM_GPIO_H
  18
  19 #include <asm-generic/gpio.h>
  20
  21 #define gpio_get_value  __gpio_get_value
  22 #define gpio_set_value  __gpio_set_value
  23 #define gpio_cansleep   __gpio_cansleep
  24 #define gpio_to_irq     __gpio_to_irq
  25
  26 /**
  27  * struct msm_gpio - GPIO pin description
  28  * @gpio_cfg - configuration bitmap, as per gpio_tlmm_config()
  29  * @label - textual label
  30  *
  31  * Usually, GPIO's are operated by sets.
  32  * This struct accumulate all GPIO information in single source
  33  * and facilitete group operations provided by msm_gpios_xxx()
  34  */
  35 struct msm_gpio {
  36         u32 gpio_cfg;
  37         const char *label;
  38 };
  39
  40 /**
  41  * msm_gpios_request_enable() - request and enable set of GPIOs
  42  *
  43  * Request and configure set of GPIO's
  44  * In case of error, all operations rolled back.
  45  * Return error code.
  46  *
  47  * @table: GPIO table
  48  * @size:  number of entries in @table
  49  */
  50 int msm_gpios_request_enable(const struct msm_gpio *table, int size);
  51
  52 /**
  53  * msm_gpios_disable_free() - disable and free set of GPIOs
  54  *
  55  * @table: GPIO table
  56  * @size:  number of entries in @table
  57  */
  58 void msm_gpios_disable_free(const struct msm_gpio *table, int size);
  59
  60 /**
  61  * msm_gpios_request() - request set of GPIOs
  62  * In case of error, all operations rolled back.
  63  * Return error code.
  64  *
  65  * @table: GPIO table
  66  * @size:  number of entries in @table
  67  */
  68 int msm_gpios_request(const struct msm_gpio *table, int size);
  69
  70 /**
  71  * msm_gpios_free() - free set of GPIOs
  72  *
  73  * @table: GPIO table
  74  * @size:  number of entries in @table
  75  */
  76 void msm_gpios_free(const struct msm_gpio *table, int size);
  77
  78 /**
  79  * msm_gpios_enable() - enable set of GPIOs
  80  * In case of error, all operations rolled back.
  81  * Return error code.
  82  *
  83  * @table: GPIO table
  84  * @size:  number of entries in @table
  85  */
  86 int msm_gpios_enable(const struct msm_gpio *table, int size);
  87
  88 /**
  89  * msm_gpios_disable() - disable set of GPIOs
  90  *
  91  * @table: GPIO table
  92  * @size:  number of entries in @table
  93  */
  94 void msm_gpios_disable(const struct msm_gpio *table, int size);
  95
  96 /* GPIO TLMM (Top Level Multiplexing) Definitions */
  97
  98 /* GPIO TLMM: Function -- GPIO specific */
  99
 100 /* GPIO TLMM: Direction */
 101 enum {
 102         GPIO_INPUT,
 103         GPIO_OUTPUT,
 104 };
 105
 106 /* GPIO TLMM: Pullup/Pulldown */
 107 enum {
 108         GPIO_NO_PULL,
 109         GPIO_PULL_DOWN,
 110         GPIO_KEEPER,
 111         GPIO_PULL_UP,
 112 };
 113
 114 /* GPIO TLMM: Drive Strength */
 115 enum {
 116         GPIO_2MA,
 117         GPIO_4MA,
 118         GPIO_6MA,
 119         GPIO_8MA,
 120         GPIO_10MA,
 121         GPIO_12MA,
 122         GPIO_14MA,
 123         GPIO_16MA,
 124 };
 125
 126 enum {
 127         GPIO_ENABLE,
 128         GPIO_DISABLE,
 129 };
 130
 131 #define GPIO_CFG(gpio, func, dir, pull, drvstr) \
 132         ((((gpio) & 0x3FF) << 4)        |         \
 133          ((func) & 0xf)                  |        \
 134          (((dir) & 0x1) << 14)           |        \
 135          (((pull) & 0x3) << 15)          |        \
 136          (((drvstr) & 0xF) << 17))
 137
 138 /**
 139  * extract GPIO pin from bit-field used for gpio_tlmm_config
 140  */
 141 #define GPIO_PIN(gpio_cfg)    (((gpio_cfg) >>  4) & 0x3ff)
 142 #define GPIO_FUNC(gpio_cfg)   (((gpio_cfg) >>  0) & 0xf)
 143 #define GPIO_DIR(gpio_cfg)    (((gpio_cfg) >> 14) & 0x1)
 144 #define GPIO_PULL(gpio_cfg)   (((gpio_cfg) >> 15) & 0x3)
 145 #define GPIO_DRVSTR(gpio_cfg) (((gpio_cfg) >> 17) & 0xf)
 146
 147 int gpio_tlmm_config(unsigned config, unsigned disable);
 148
 149 #endif /* __ASM_ARCH_MSM_GPIO_H */