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); }