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Diffstat (limited to 'arch/arm/plat-mxc/include/mach/iomux-v3.h')
| -rw-r--r-- | arch/arm/plat-mxc/include/mach/iomux-v3.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/include/mach/iomux-v3.h b/arch/arm/plat-mxc/include/mach/iomux-v3.h new file mode 100644 index 00000000000..7cd84547658 --- /dev/null +++ b/arch/arm/plat-mxc/include/mach/iomux-v3.h @@ -0,0 +1,121 @@ +/* + * 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> + * + */ + +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_DRIVE_VOLTAGE_3_3_V 0 +#define PAD_CTL_DRIVE_VOLTAGE_1_8_V 1 + +#define PAD_CTL_NO_HYSTERESIS 0 +#define PAD_CTL_HYSTERESIS 1 + +#define PAD_CTL_PULL_DISABLED 0x0 +#define PAD_CTL_PULL_KEEPER 0xa +#define PAD_CTL_PULL_DOWN_100K 0xc +#define PAD_CTL_PULL_UP_47K 0xd +#define PAD_CTL_PULL_UP_100K 0xe +#define PAD_CTL_PULL_UP_22K 0xf + +#define PAD_CTL_OUTPUT_CMOS 0 +#define PAD_CTL_OUTPUT_OPEN_DRAIN 1 + +#define PAD_CTL_DRIVE_STRENGTH_NORM 0 +#define PAD_CTL_DRIVE_STRENGTH_HIGH 1 +#define PAD_CTL_DRIVE_STRENGTH_MAX 2 + +#define PAD_CTL_SLEW_RATE_SLOW 0 +#define PAD_CTL_SLEW_RATE_FAST 1 + +/* + * 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); + +#endif /* __MACH_IOMUX_V3_H__*/ + |