| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <assert.h> |
| #include <delay.h> |
| #include <device/mmio.h> |
| #include <soc/addressmap.h> |
| #include <soc/auxadc.h> |
| #include <soc/efuse.h> |
| #include <timer.h> |
| |
| static struct mtk_auxadc_regs *const mtk_auxadc = (void *)AUXADC_BASE; |
| |
| #define ADC_GE_A_SHIFT 10 |
| #define ADC_GE_A_MASK (0x3ff << ADC_GE_A_SHIFT) |
| #define ADC_OE_A_SHIFT 0 |
| #define ADC_OE_A_MASK (0x3ff << ADC_OE_A_SHIFT) |
| #define ADC_CALI_EN_A_SHIFT 20 |
| #define ADC_CALI_EN_A_MASK (0x1 << ADC_CALI_EN_A_SHIFT) |
| |
| static int cali_oe; |
| static int cali_ge; |
| static int calibrated = 0; |
| static void mt_auxadc_update_cali(void) |
| { |
| uint32_t cali_reg; |
| int cali_ge_a; |
| int cali_oe_a; |
| |
| cali_reg = read32(&mtk_efuse->adc_cali_reg); |
| |
| if ((cali_reg & ADC_CALI_EN_A_MASK) != 0) { |
| cali_oe_a = (cali_reg & ADC_OE_A_MASK) >> ADC_OE_A_SHIFT; |
| cali_ge_a = (cali_reg & ADC_GE_A_MASK) >> ADC_GE_A_SHIFT; |
| cali_ge = cali_ge_a - 512; |
| cali_oe = cali_oe_a - 512; |
| } |
| } |
| |
| static uint32_t auxadc_get_rawdata(int channel) |
| { |
| setbits32(&mtk_infracfg->module_sw_cg_1_clr, 1 << 10); |
| assert(wait_ms(300, !(read32(&mtk_auxadc->con2) & 0x1))); |
| |
| clrbits32(&mtk_auxadc->con1, 1 << channel); |
| assert(wait_ms(300, !(read32(&mtk_auxadc->data[channel]) & (1 << 12)))); |
| |
| setbits32(&mtk_auxadc->con1, 1 << channel); |
| udelay(25); |
| assert(wait_ms(300, read32(&mtk_auxadc->data[channel]) & (1 << 12))); |
| |
| uint32_t value = read32(&mtk_auxadc->data[channel]) & 0x0FFF; |
| |
| setbits32(&mtk_infracfg->module_sw_cg_1_set, 1 << 10); |
| |
| return value; |
| } |
| |
| unsigned int auxadc_get_voltage_uv(unsigned int channel) |
| { |
| uint32_t raw_value; |
| assert(channel < 16); |
| |
| if (!calibrated) { |
| mt_auxadc_update_cali(); |
| calibrated = 1; |
| } |
| |
| /* 1.5V in 4096 steps */ |
| raw_value = auxadc_get_rawdata(channel); |
| raw_value = raw_value - cali_oe; |
| return (unsigned int)((int64_t)raw_value * 1500000 / (4096 + cali_ge)); |
| } |