Author: loos
Date: Mon Mar 21 03:39:38 2016
New Revision: 297134
URL: https://svnweb.freebsd.org/changeset/base/297134
Log:
Use the internal references for ADC, this fixes the ADC readings on uBMC.
Tested on BBB and uBMC.
Sponsored by: Rubicon Communications (Netgate)
Modified:
head/sys/arm/ti/ti_adc.c
Modified: head/sys/arm/ti/ti_adc.c
==============================================================================
--- head/sys/arm/ti/ti_adc.c Mon Mar 21 03:29:45 2016 (r297133)
+++ head/sys/arm/ti/ti_adc.c Mon Mar 21 03:39:38 2016 (r297134)
@@ -161,11 +161,9 @@ ti_adc_input_setup(struct ti_adc_softc *
/* Set the negative voltage reference. */
val &= ~ADC_STEP_RFM_MSK;
- val |= ADC_STEP_RFM_VREFN << ADC_STEP_RFM_SHIFT;
/* Set the positive voltage reference. */
val &= ~ADC_STEP_RFP_MSK;
- val |= ADC_STEP_RFP_VREFP << ADC_STEP_RFP_SHIFT;
/* Set the samples average. */
val &= ~ADC_STEP_AVG_MSK;
@@ -450,11 +448,9 @@ ti_adc_idlestep_init(struct ti_adc_softc
/* Set the negative voltage reference. */
val &= ~ADC_STEP_RFM_MSK;
- val |= ADC_STEP_RFM_VREFN << ADC_STEP_RFM_SHIFT;
/* Set the positive voltage reference. */
val &= ~ADC_STEP_RFP_MSK;
- val |= ADC_STEP_RFP_VREFP << ADC_STEP_RFP_SHIFT;
/* Connect the input to VREFN. */
val &= ~ADC_STEP_INP_MSK;
@@ -484,6 +480,11 @@ ti_adc_attach(device_t dev)
sc = device_get_softc(dev);
sc->sc_dev = dev;
+ /* Activate the ADC_TSC module. */
+ err = ti_prcm_clk_enable(TSC_ADC_CLK);
+ if (err)
+ return (err);
+
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
@@ -509,11 +510,6 @@ ti_adc_attach(device_t dev)
return (ENXIO);
}
- /* Activate the ADC_TSC module. */
- err = ti_prcm_clk_enable(TSC_ADC_CLK);
- if (err)
- return (err);
-
/* Check the ADC revision. */
rev = ADC_READ4(sc, ADC_REVISION);
device_printf(dev,
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