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/*
* Copyright (C) 2008-2010 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_MX5 Board GPIO and Muxing Setup
* @ingroup MSL_MX5
*/
/*!
* @file mach-mx5/iomux.c
*
* @brief I/O Muxing control functions
*
* @ingroup GPIO_MX5
*/
#include <linux/io.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <mach/hardware.h>
#include <mach/gpio.h>
#include <mach/irqs.h>
#include "iomux.h"
#include "mx51_pins.h"
#define MUX_I_START_MX53 0x0020
#define PAD_I_START_MX53 0x348
#define INPUT_CTL_START_MX53 0x730
#define MUX_I_END_MX53 (PAD_I_START_MX53 - 4)
/*!
* IOMUX register (base) addressesf
*/
#define IOMUXGPR0 (IO_ADDRESS(IOMUXC_BASE_ADDR))
#define IOMUXGPR1 (IO_ADDRESS(IOMUXC_BASE_ADDR) + 0x004)
#define IOMUXSW_MUX_CTL (IO_ADDRESS(IOMUXC_BASE_ADDR))
#define IOMUXSW_INPUT_CTL (IO_ADDRESS(IOMUXC_BASE_ADDR))
static u8 iomux_pin_res_table[(0x3F0 / 4) + 1];
static DEFINE_SPINLOCK(gpio_mux_lock);
static inline void *_get_sw_pad(void)
{
if (cpu_is_mx51())
return IO_ADDRESS(IOMUXC_BASE_ADDR) + PAD_I_START_MX51;
else
return IO_ADDRESS(IOMUXC_BASE_ADDR) + PAD_I_START_MX53;
}
static inline void * _get_mux_reg(iomux_pin_name_t pin)
{
u32 mux_reg = PIN_TO_IOMUX_MUX(pin);
if (cpu_is_mx51_rev(CHIP_REV_2_0) < 0) {
if ((pin == MX51_PIN_NANDF_RB5) ||
(pin == MX51_PIN_NANDF_RB6) ||
(pin == MX51_PIN_NANDF_RB7))
; /* Do nothing */
else if (mux_reg >= 0x2FC)
mux_reg += 8;
else if (mux_reg >= 0x130)
mux_reg += 0xC;
}
return IOMUXSW_MUX_CTL + mux_reg;
}
static inline void * _get_pad_reg(iomux_pin_name_t pin)
{
u32 pad_reg = PIN_TO_IOMUX_PAD(pin);
void __iomem *sw_pad_reg = _get_sw_pad();
if (cpu_is_mx51_rev(CHIP_REV_2_0) < 0) {
if ((pin == MX51_PIN_NANDF_RB5) ||
(pin == MX51_PIN_NANDF_RB6) ||
(pin == MX51_PIN_NANDF_RB7))
; /* Do nothing */
else if (pad_reg == 0x4D0 - PAD_I_START_MX51)
pad_reg += 0x4C;
else if (pad_reg == 0x860 - PAD_I_START_MX51)
pad_reg += 0x9C;
else if (pad_reg >= 0x804 - PAD_I_START_MX51)
pad_reg += 0xB0;
else if (pad_reg >= 0x7FC - PAD_I_START_MX51)
pad_reg += 0xB4;
else if (pad_reg >= 0x4E4 - PAD_I_START_MX51)
pad_reg += 0xCC;
else
pad_reg += 8;
}
return sw_pad_reg + pad_reg;
}
static inline void * _get_mux_end(void)
{
if (cpu_is_mx51_rev(CHIP_REV_2_0) < 0)
return(IO_ADDRESS(IOMUXC_BASE_ADDR) + (0x3F8 - 4));
else
return(IO_ADDRESS(IOMUXC_BASE_ADDR) + (0x3F0 - 4));
}
/*!
* This function is used to configure a pin through the IOMUX module.
* @param pin a pin number as defined in \b #iomux_pin_name_t
* @param config a configuration 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 config)
{
u32 ret = 0;
u32 pin_index = PIN_TO_IOMUX_INDEX(pin);
void __iomem *mux_reg = _get_mux_reg(pin);
u32 mux_data = 0;
u8 *rp;
BUG_ON((mux_reg > _get_mux_end()) || (mux_reg < IOMUXSW_MUX_CTL));
spin_lock(&gpio_mux_lock);
if (config == IOMUX_CONFIG_GPIO)
mux_data = PIN_TO_ALT_GPIO(pin);
else
mux_data = config;
__raw_writel(mux_data, mux_reg);
/*
* Log a warning if a pin changes ownership
*/
rp = iomux_pin_res_table + pin_index;
if ((mux_data & *rp) && (*rp != mux_data)) {
/*
* Don't call printk if we're tweaking the console uart or
* we'll deadlock.
*/
printk(KERN_ERR "iomux_config_mux: Warning: iomux pin"
" config changed, reg=%p, "
" prev=0x%x new=0x%x\n", mux_reg, *rp, mux_data);
ret = -EINVAL;
}
*rp = mux_data;
spin_unlock(&gpio_mux_lock);
return ret;
}
/*!
* 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 config a configuration 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 config)
{
int ret = iomux_config_mux(pin, config);
int gpio = IOMUX_TO_GPIO(pin);
if (!ret && (gpio < MXC_GPIO_IRQS) && ((config == IOMUX_CONFIG_GPIO)
|| (config == PIN_TO_ALT_GPIO(pin))))
ret |= gpio_request(gpio, NULL);
return ret;
}
EXPORT_SYMBOL(mxc_request_iomux);
/*!
* Configure an IO pin without requesting ownership. The pin needs to be
* requested afterwards using gpio_request or through the sysfs.
*
* @param pin a name defined by \b iomux_pin_name_t
* @param config a configuration as defined in \b #iomux_pin_cfg_t
*
* @return 0 if successful; Non-zero otherwise
*/
int mxc_config_iomux(iomux_pin_name_t pin, iomux_pin_cfg_t config)
{
return( iomux_config_mux(pin, config) );
}
EXPORT_SYMBOL(mxc_config_iomux);
/*!
* Release ownership for an IO pin
*
* @param pin a name defined by \b iomux_pin_name_t
* @param config config as defined in \b #iomux_pin_ocfg_t
*/
void mxc_free_iomux(iomux_pin_name_t pin, iomux_pin_cfg_t config)
{
u32 pin_index = PIN_TO_IOMUX_INDEX(pin);
u8 *rp = iomux_pin_res_table + pin_index;
int gpio = IOMUX_TO_GPIO(pin);
*rp = 0;
if ((gpio < MXC_GPIO_IRQS)
&& ((config == IOMUX_CONFIG_GPIO)
|| (config == PIN_TO_ALT_GPIO(pin))))
gpio_free(gpio);
}
EXPORT_SYMBOL(mxc_free_iomux);
/*!
* 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)
{
void __iomem *pad_reg = _get_pad_reg(pin);
void __iomem *sw_pad_reg = _get_sw_pad();
BUG_ON(pad_reg < sw_pad_reg);
__raw_writel(config, pad_reg);
}
EXPORT_SYMBOL(mxc_iomux_set_pad);
unsigned int mxc_iomux_get_pad(iomux_pin_name_t pin)
{
void __iomem *pad_reg = _get_pad_reg(pin);
return __raw_readl(pad_reg);
}
EXPORT_SYMBOL(mxc_iomux_get_pad);
/*!
* 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)
{
void __iomem *reg;
if (cpu_is_mx51_rev(CHIP_REV_2_0) < 0) {
if (input == MUX_IN_IPU_IPP_DI_0_IND_DISPB_SD_D_SELECT_INPUT)
input -= 4;
else if (input == MUX_IN_IPU_IPP_DI_1_IND_DISPB_SD_D_SELECT_INPUT)
input -= 3;
else if (input >= MUX_IN_KPP_IPP_IND_COL_6_SELECT_INPUT)
input -= 2;
else if (input >= MUX_IN_HSC_MIPI_MIX_PAR_SISG_TRIG_SELECT_INPUT)
input -= 5;
else if (input >= MUX_IN_HSC_MIPI_MIX_IPP_IND_SENS1_DATA_EN_SELECT_INPUT)
input -= 3;
else if (input >= MUX_IN_ECSPI2_IPP_IND_SS_B_3_SELECT_INPUT)
input -= 2;
else if (input >= MUX_IN_CCM_PLL1_BYPASS_CLK_SELECT_INPUT)
input -= 1;
reg = IOMUXSW_INPUT_CTL + (input << 2) + INPUT_CTL_START_MX51_TO1;
} else if (cpu_is_mx51()) {
reg = IOMUXSW_INPUT_CTL + (input << 2) + INPUT_CTL_START_MX51;
} else
reg = IOMUXSW_INPUT_CTL + (input << 2) + INPUT_CTL_START_MX53;
BUG_ON(input >= MUX_INPUT_NUM_MUX);
__raw_writel(config, reg);
}
EXPORT_SYMBOL(mxc_iomux_set_input);
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