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/*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/*!
* @defgroup GPIO_MX25 Board GPIO and Muxing Setup
* @ingroup MSL_MX25
*/
/*!
* @file mach-mx25/iomux.c
*
* @brief I/O Muxing control functions
*
* @ingroup GPIO_MX25
*/
#include <common.h>
#include <asm/arch/mx25.h>
#include <asm/arch/mx25_pins.h>
#include <asm/arch/iomux.h>
/*!
* IOMUX register (base) addresses
*/
enum iomux_reg_addr {
IOMUXGPR = IOMUXC_BASE,
/*!< General purpose */
IOMUXSW_MUX_CTL = IOMUXC_BASE + 0x008,
/*!< MUX control */
IOMUXSW_MUX_END = IOMUXC_BASE + 0x228,
/*!< last MUX control register */
IOMUXSW_PAD_CTL = IOMUXC_BASE + 0x22C,
/*!< Pad control */
IOMUXSW_PAD_END = IOMUXC_BASE + 0x414,
/*!< last Pad control register */
IOMUXSW_INPUT_CTL = IOMUXC_BASE + 0x460,
/*!< input select register */
IOMUXSW_INPUT_END = IOMUXC_BASE + 0x580,
/*!< last input select register */
};
#define MUX_PIN_NUM_MAX \
(((IOMUXSW_MUX_END - IOMUXSW_MUX_CTL) >> 2) + 1)
#define MUX_INPUT_NUM_MUX \
(((IOMUXSW_INPUT_END - IOMUXSW_INPUT_CTL) >> 2) + 1)
#define PIN_TO_IOMUX_INDEX(pin) (PIN_TO_IOMUX_MUX(pin) >> 2)
#define MUX_USED 0x80
/*!
* This function is used to configure a pin through the IOMUX module.
* FIXED ME: for backward compatible. Will be static function!
* @param pin a pin number as defined in \b #iomux_pin_name_t
* @param cfg an output function as defined in \b #iomux_pin_cfg_t
*
* @return 0 if successful; Non-zero otherwise
*/
static int iomux_config_mux(iomux_pin_name_t pin, iomux_pin_cfg_t cfg)
{
u32 mux_reg = PIN_TO_IOMUX_MUX(pin);
if (mux_reg != NON_MUX_I) {
mux_reg += IOMUXGPR;
__REG(mux_reg) = cfg;
}
return 0;
}
/*!
* Request ownership for an IO pin. This function has to be the first one
* being called before that pin is used. The caller has to check the
* return value to make sure it returns 0.
*
* @param pin a name defined by \b iomux_pin_name_t
* @param cfg an input function as defined in \b #iomux_pin_cfg_t
*
* @return 0 if successful; Non-zero otherwise
*/
int mxc_request_iomux(iomux_pin_name_t pin, iomux_pin_cfg_t cfg)
{
int ret = iomux_config_mux(pin, cfg);
return ret;
}
/*!
* Release ownership for an IO pin
*
* @param pin a name defined by \b iomux_pin_name_t
* @param cfg an input function as defined in \b #iomux_pin_cfg_t
*/
void mxc_free_iomux(iomux_pin_name_t pin, iomux_pin_cfg_t cfg)
{
}
/*!
* This function configures the pad value for a IOMUX pin.
*
* @param pin a pin number as defined in \b #iomux_pin_name_t
* @param config the ORed value of elements defined in \b #iomux_pad_config_t
*/
void mxc_iomux_set_pad(iomux_pin_name_t pin, u32 config)
{
u32 pad_reg = IOMUXGPR + PIN_TO_IOMUX_PAD(pin);
__REG(pad_reg) = config;
}
/*!
* This function enables/disables the general purpose function for a particular
* signal.
*
* @param gp one signal as defined in \b #iomux_gp_func_t
* @param en \b #true to enable; \b #false to disable
*/
void mxc_iomux_set_gpr(iomux_gp_func_t gp, int en)
{
u32 l;
l = __REG(IOMUXGPR);
if (en)
l |= gp;
else
l &= ~gp;
__REG(IOMUXGPR) = l;
}
/*!
* This function configures input path.
*
* @param input index of input select register as defined in \b
* #iomux_input_select_t
* @param config the binary value of elements defined in \b
* #iomux_input_config_t
*/
void mxc_iomux_set_input(iomux_input_select_t input, u32 config)
{
u32 reg = IOMUXSW_INPUT_CTL + (input << 2);
__REG(reg) = config;
}
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