arch/arm/plat-mxc/include/mach/iomux-v3.h

   1 /*
   2  * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
   3  *                      <armlinux@phytec.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  17  * MA 02110-1301, USA.
  18  */
  19
  20 #ifndef __MACH_IOMUX_V3_H__
  21 #define __MACH_IOMUX_V3_H__
  22
  23 /*
  24  *      build IOMUX_PAD structure
  25  *
  26  * This iomux scheme is based around pads, which are the physical balls
  27  * on the processor.
  28  *
  29  * - Each pad has a pad control register (IOMUXC_SW_PAD_CTRL_x) which controls
  30  *   things like driving strength and pullup/pulldown.
  31  * - Each pad can have but not necessarily does have an output routing register
  32  *   (IOMUXC_SW_MUX_CTL_PAD_x).
  33  * - Each pad can have but not necessarily does have an input routing register
  34  *   (IOMUXC_x_SELECT_INPUT)
  35  *
  36  * The three register sets do not have a fixed offset to each other,
  37  * hence we order this table by pad control registers (which all pads
  38  * have) and put the optional i/o routing registers into additional
  39  * fields.
  40  *
  41  * The naming convention for the pad modes is MX35_PAD_<padname>__<padmode>
  42  * If <padname> or <padmode> refers to a GPIO, it is named
  43  * GPIO_<unit>_<num>
  44  *
  45  */
  46
  47 struct pad_desc {
  48         unsigned mux_ctrl_ofs:12; /* IOMUXC_SW_MUX_CTL_PAD offset */
  49         unsigned mux_mode:8;
  50         unsigned pad_ctrl_ofs:12; /* IOMUXC_SW_PAD_CTRL offset */
  51 #define NO_PAD_CTRL     (1 << 16)
  52         unsigned pad_ctrl:17;
  53         unsigned select_input_ofs:12; /* IOMUXC_SELECT_INPUT offset */
  54         unsigned select_input:3;
  55 };
  56
  57 #define IOMUX_PAD(_pad_ctrl_ofs, _mux_ctrl_ofs, _mux_mode, _select_input_ofs, \
  58                 _select_input, _pad_ctrl)                               \
  59                 {                                                       \
  60                         .mux_ctrl_ofs     = _mux_ctrl_ofs,              \
  61                         .mux_mode         = _mux_mode,                  \
  62                         .pad_ctrl_ofs     = _pad_ctrl_ofs,              \
  63                         .pad_ctrl         = _pad_ctrl,                  \
  64                         .select_input_ofs = _select_input_ofs,          \
  65                         .select_input     = _select_input,              \
  66                 }
  67
  68 /*
  69  * Use to set PAD control
  70  */
  71 #define PAD_CTL_DRIVE_VOLTAGE_3_3_V     0
  72 #define PAD_CTL_DRIVE_VOLTAGE_1_8_V     1
  73
  74 #define PAD_CTL_NO_HYSTERESIS           0
  75 #define PAD_CTL_HYSTERESIS              1
  76
  77 #define PAD_CTL_PULL_DISABLED           0x0
  78 #define PAD_CTL_PULL_KEEPER             0xa
  79 #define PAD_CTL_PULL_DOWN_100K          0xc
  80 #define PAD_CTL_PULL_UP_47K             0xd
  81 #define PAD_CTL_PULL_UP_100K            0xe
  82 #define PAD_CTL_PULL_UP_22K             0xf
  83
  84 #define PAD_CTL_OUTPUT_CMOS             0
  85 #define PAD_CTL_OUTPUT_OPEN_DRAIN       1
  86
  87 #define PAD_CTL_DRIVE_STRENGTH_NORM     0
  88 #define PAD_CTL_DRIVE_STRENGTH_HIGH     1
  89 #define PAD_CTL_DRIVE_STRENGTH_MAX      2
  90
  91 #define PAD_CTL_SLEW_RATE_SLOW          0
  92 #define PAD_CTL_SLEW_RATE_FAST          1
  93
  94 /*
  95  * setups a single pad:
  96  *      - reserves the pad so that it is not claimed by another driver
  97  *      - setups the iomux according to the configuration
  98  */
  99 int mxc_iomux_v3_setup_pad(struct pad_desc *pad);
 100
 101 /*
 102  * setups mutliple pads
 103  * convenient way to call the above function with tables
 104  */
 105 int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count);
 106
 107 /*
 108  * releases a single pad:
 109  *      - make it available for a future use by another driver
 110  *      - DOES NOT reconfigure the IOMUX in its reset state
 111  */
 112 void mxc_iomux_v3_release_pad(struct pad_desc *pad);
 113
 114 /*
 115  * releases multiple pads
 116  * convenvient way to call the above function with tables
 117  */
 118 void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count);
 119
 120 #endif /* __MACH_IOMUX_V3_H__*/
 121