/*!
* 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 ret = 0;
u32 pin_index = PIN_TO_IOMUX_INDEX(pin);
u32 mux_reg = PIN_TO_IOMUX_MUX(pin);
u8 *rp;
BUG_ON(pin_index > MUX_PIN_NUM_MAX);
if (mux_reg != NON_MUX_I) {
mux_reg += IOMUXGPR;
BUG_ON((mux_reg > IOMUXSW_MUX_END)
|| (mux_reg < IOMUXSW_MUX_CTL));
spin_lock(&gpio_mux_lock);
__raw_writel(cfg, mux_reg);
/*
* Log a warning if a pin changes ownership
*/
rp = iomux_pin_res_table + pin_index;
if (*rp && *rp != (cfg | MUX_USED)) {
/*Console: how to do */
printk(KERN_ERR "iomux_config_mux: Warning: iomux pin"
" config changed, index=%d register=%d, "
" prev=0x%x new=0x%x\n", pin_index, mux_reg,
*rp, cfg);
ret = -EINVAL;
}
*rp = cfg | MUX_USED;
spin_unlock(&gpio_mux_lock);
}
return ret;
}
/*!
* 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);
BUG_ON(pin_index > MUX_PIN_NUM_MAX);
*rp = 0;
if ((gpio < MXC_GPIO_IRQS) && ((config == IOMUX_CONFIG_GPIO)
|| (config == PIN_TO_ALT_GPIO(pin)))) {
gpio_free(gpio);
}
}
/*!
* 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)
{
u32 pin_index = PIN_TO_IOMUX_INDEX(pin);
u8 *rp = iomux_pin_res_table + pin_index;
BUG_ON((pin_index > MUX_PIN_NUM_MAX));
*rp = 0;
if (GPIO_TO_PORT(IOMUX_TO_GPIO(pin)) < GPIO_PORT_NUM) {
if (((cfg & (~MUX_CONFIG_SION)) == MUX_CONFIG_GPIO) ||
(((cfg & (~MUX_CONFIG_SION)) == MUX_CONFIG_FUNC) &&
((pin == MX35_PIN_GPIO1_0) || (pin == MX35_PIN_GPIO1_1) ||
(pin == MX35_PIN_GPIO2_0) || (pin == MX35_PIN_GPIO3_0))))
mxc_free_gpio(pin);
}
}
/*!
* 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 *mux_reg = IOMUXSW_MUX_CTL + PIN_TO_IOMUX_MUX(pin);
u32 mux_data = 0;
u8 *rp;
BUG_ON((mux_reg > IOMUXSW_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, pin=%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;
}
