static void lradc_keypad_hwinit ()
{
/* Clear the Clock Gate and SFTRST for normal operation */
HW_LRADC_CTRL0_CLR(BM_LRADC_CTRL0_SFTRST);
HW_LRADC_CTRL0_CLR(BM_LRADC_CTRL0_CLKGATE);
/* Disable on-chip ground reference */
HW_LRADC_CTRL0_CLR(BM_LRADC_CTRL0_ONCHIP_GROUNDREF);
/* Configure 6Mhz frequency */
HW_LRADC_CTRL3_CLR(BM_LRADC_CTRL3_CYCLE_TIME);
HW_LRADC_CTRL3_SET(BF_LRADC_CTRL3_CYCLE_TIME(LRADC_CLOCK_6MHZ));
/* Select VddIO input on channel 6 */
HW_LRADC_CTRL4_CLR(BM_LRADC_CTRL4_LRADC6SELECT);
HW_LRADC_CTRL4_SET(BF_LRADC_CTRL4_LRADC6SELECT(lradc_vddio_ch));
/*
* Clear the divide by two for channel 6 since it has a HW
* divide-by-two built in, and enable this feature for the
* button channel
*/
HW_LRADC_CTRL2_CLR(BF_LRADC_CTRL2_DIVIDE_BY_TWO(1<<VDDIO_VOLTAGE_CH));
HW_LRADC_CTRL2_SET(BF_LRADC_CTRL2_DIVIDE_BY_TWO(1<<lradc_keypad_ch));
/* Clear the accumulator & NUM_SAMPLES */
HW_LRADC_CHn_CLR(VDDIO_VOLTAGE_CH, 0xFFFFFFFF);
HW_LRADC_CHn_CLR(lradc_keypad_ch, 0xFFFFFFFF);
}
void hw_lradc_reinit(int enable_ground_ref, unsigned freq)
{
__raw_writel(BM_LRADC_CTRL0_SFTRST,
mxs_lradc.base + HW_LRADC_CTRL0_SET);
udelay(1);
__raw_writel(BM_LRADC_CTRL0_SFTRST,
mxs_lradc.base + HW_LRADC_CTRL0_CLR);
/* Clear the Clock Gate for normal operation */
__raw_writel(BM_LRADC_CTRL0_CLKGATE,
mxs_lradc.base + HW_LRADC_CTRL0_CLR);
if (enable_ground_ref)
__raw_writel(BM_LRADC_CTRL0_ONCHIP_GROUNDREF,
mxs_lradc.base + HW_LRADC_CTRL0_SET);
else
__raw_writel(BM_LRADC_CTRL0_ONCHIP_GROUNDREF,
mxs_lradc.base + HW_LRADC_CTRL0_CLR);
__raw_writel(BM_LRADC_CTRL3_CYCLE_TIME,
mxs_lradc.base + HW_LRADC_CTRL3_CLR);
__raw_writel(BF_LRADC_CTRL3_CYCLE_TIME(freq),
mxs_lradc.base + HW_LRADC_CTRL3_SET);
__raw_writel(BM_LRADC_CTRL4_LRADC6SELECT | BM_LRADC_CTRL4_LRADC7SELECT,
mxs_lradc.base + HW_LRADC_CTRL4_CLR);
__raw_writel(BF_LRADC_CTRL4_LRADC6SELECT(mxs_lradc.vddio_voltage),
mxs_lradc.base + HW_LRADC_CTRL4_SET);
__raw_writel(BF_LRADC_CTRL4_LRADC7SELECT(mxs_lradc.battery_voltage),
mxs_lradc.base + HW_LRADC_CTRL4_SET);
}