Logo Search packages:      
Sourcecode: linux version File versions  Download package

iomux-v3.h

/*
 * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
 *                <armlinux@phytec.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 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 __MACH_IOMUX_V3_H__
#define __MACH_IOMUX_V3_H__

/*
 *    build IOMUX_PAD structure
 *
 * This iomux scheme is based around pads, which are the physical balls
 * on the processor.
 *
 * - Each pad has a pad control register (IOMUXC_SW_PAD_CTRL_x) which controls
 *   things like driving strength and pullup/pulldown.
 * - Each pad can have but not necessarily does have an output routing register
 *   (IOMUXC_SW_MUX_CTL_PAD_x).
 * - Each pad can have but not necessarily does have an input routing register
 *   (IOMUXC_x_SELECT_INPUT)
 *
 * The three register sets do not have a fixed offset to each other,
 * hence we order this table by pad control registers (which all pads
 * have) and put the optional i/o routing registers into additional
 * fields.
 *
 * The naming convention for the pad modes is MX35_PAD_<padname>__<padmode>
 * If <padname> or <padmode> refers to a GPIO, it is named
 * GPIO_<unit>_<num>
 *
 */

00047 struct pad_desc {
      unsigned mux_ctrl_ofs:12; /* IOMUXC_SW_MUX_CTL_PAD offset */
      unsigned mux_mode:8;
      unsigned pad_ctrl_ofs:12; /* IOMUXC_SW_PAD_CTRL offset */
#define     NO_PAD_CTRL (1 << 16)
      unsigned pad_ctrl:17;
      unsigned select_input_ofs:12; /* IOMUXC_SELECT_INPUT offset */
      unsigned select_input:3;
};

#define IOMUX_PAD(_pad_ctrl_ofs, _mux_ctrl_ofs, _mux_mode, _select_input_ofs, \
            _select_input, _pad_ctrl)                       \
            {                                         \
                  .mux_ctrl_ofs     = _mux_ctrl_ofs,        \
                  .mux_mode         = _mux_mode,                  \
                  .pad_ctrl_ofs     = _pad_ctrl_ofs,        \
                  .pad_ctrl         = _pad_ctrl,                  \
                  .select_input_ofs = _select_input_ofs,          \
                  .select_input     = _select_input,        \
            }

/*
 * Use to set PAD control
 */

#define PAD_CTL_DVS                 (1 << 13)
#define PAD_CTL_HYS                 (1 << 8)

#define PAD_CTL_PKE                 (1 << 7)
#define PAD_CTL_PUE                 (1 << 6)
#define PAD_CTL_PUS_100K_DOWN       (0 << 4)
#define PAD_CTL_PUS_47K_UP          (1 << 4)
#define PAD_CTL_PUS_100K_UP         (2 << 4)
#define PAD_CTL_PUS_22K_UP          (3 << 4)

#define PAD_CTL_ODE                 (1 << 3)

#define PAD_CTL_DSE_STANDARD        (0 << 1)
#define PAD_CTL_DSE_HIGH            (1 << 1)
#define PAD_CTL_DSE_MAX             (2 << 1)

#define PAD_CTL_SRE_FAST            (1 << 0)

/*
 * setups a single pad:
 *    - reserves the pad so that it is not claimed by another driver
 *    - setups the iomux according to the configuration
 */
int mxc_iomux_v3_setup_pad(struct pad_desc *pad);

/*
 * setups mutliple pads
 * convenient way to call the above function with tables
 */
int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count);

/*
 * releases a single pad:
 *    - make it available for a future use by another driver
 *    - DOES NOT reconfigure the IOMUX in its reset state
 */
void mxc_iomux_v3_release_pad(struct pad_desc *pad);

/*
 * releases multiple pads
 * convenvient way to call the above function with tables
 */
void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count);

/*
 * Initialise the iomux controller
 */
void mxc_iomux_v3_init(void __iomem *iomux_v3_base);

#endif /* __MACH_IOMUX_V3_H__*/


Generated by  Doxygen 1.6.0   Back to index