diff options
Diffstat (limited to 'drivers/adc/stm32-adc.c')
| -rw-r--r-- | drivers/adc/stm32-adc.c | 88 |
1 files changed, 74 insertions, 14 deletions
diff --git a/drivers/adc/stm32-adc.c b/drivers/adc/stm32-adc.c index d50f00f1233..b11f771b71c 100644 --- a/drivers/adc/stm32-adc.c +++ b/drivers/adc/stm32-adc.c @@ -49,29 +49,68 @@ /* STM32H7_ADC_SQR1 - bit fields */ #define STM32H7_SQ1_SHIFT 6 +/* STM32H7_ADC_DIFSEL - bit fields */ +#define STM32H7_DIFSEL_SHIFT 0 +#define STM32H7_DIFSEL_MASK GENMASK(19, 0) + /* BOOST bit must be set on STM32H7 when ADC clock is above 20MHz */ #define STM32H7_BOOST_CLKRATE 20000000UL +/* STM32MP13 - Registers for each ADC instance */ +#define STM32MP13_ADC_DIFSEL 0xB0 + +/* STM32MP13_ADC_CFGR specific bit fields */ +#define STM32MP13_DMAEN BIT(0) +#define STM32MP13_DMACFG BIT(1) + +/* STM32MP13_ADC_DIFSEL - bit fields */ +#define STM32MP13_DIFSEL_SHIFT 0 +#define STM32MP13_DIFSEL_MASK GENMASK(18, 0) + #define STM32_ADC_CH_MAX 20 /* max number of channels */ #define STM32_ADC_TIMEOUT_US 100000 +struct stm32_adc { + void __iomem *regs; + int active_channel; + const struct stm32_adc_cfg *cfg; +}; + +struct stm32_adc_regs { + int reg; + int mask; + int shift; +}; + +struct stm32_adc_regspec { + const struct stm32_adc_regs difsel; +}; + struct stm32_adc_cfg { + const struct stm32_adc_regspec *regs; unsigned int max_channels; unsigned int num_bits; bool has_vregready; + bool has_boostmode; + bool has_linearcal; + bool has_presel; }; -struct stm32_adc { - void __iomem *regs; - int active_channel; - const struct stm32_adc_cfg *cfg; +static const struct stm32_adc_regspec stm32h7_adc_regspec = { + .difsel = { STM32H7_ADC_DIFSEL, STM32H7_DIFSEL_MASK }, +}; + +static const struct stm32_adc_regspec stm32mp13_adc_regspec = { + .difsel = { STM32MP13_ADC_DIFSEL, STM32MP13_DIFSEL_MASK }, }; static void stm32_adc_enter_pwr_down(struct udevice *dev) { struct stm32_adc *adc = dev_get_priv(dev); - clrbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_BOOST); + if (adc->cfg->has_boostmode) + clrbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_BOOST); + /* Setting DEEPPWD disables ADC vreg and clears ADVREGEN */ setbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_DEEPPWD); } @@ -90,8 +129,7 @@ static int stm32_adc_exit_pwr_down(struct udevice *dev) /* Exit deep power down, then enable ADC voltage regulator */ clrbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_DEEPPWD); setbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_ADVREGEN); - - if (common->rate > STM32H7_BOOST_CLKRATE) + if (adc->cfg->has_boostmode && common->rate > STM32H7_BOOST_CLKRATE) setbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_BOOST); /* Wait for startup time */ @@ -134,7 +172,7 @@ static int stm32_adc_start_channel(struct udevice *dev, int channel) return ret; /* Only use single ended channels */ - writel(0, adc->regs + STM32H7_ADC_DIFSEL); + clrbits_le32(adc->regs + adc->cfg->regs->difsel.reg, adc->cfg->regs->difsel.mask); /* Enable ADC, Poll for ADRDY to be set (after adc startup time) */ setbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_ADEN); @@ -147,7 +185,8 @@ static int stm32_adc_start_channel(struct udevice *dev, int channel) } /* Preselect channels */ - writel(uc_pdata->channel_mask, adc->regs + STM32H7_ADC_PCSEL); + if (adc->cfg->has_presel) + writel(uc_pdata->channel_mask, adc->regs + STM32H7_ADC_PCSEL); /* Set sampling time to max value by default */ writel(0xffffffff, adc->regs + STM32H7_ADC_SMPR1); @@ -156,9 +195,11 @@ static int stm32_adc_start_channel(struct udevice *dev, int channel) /* Program regular sequence: chan in SQ1 & len = 0 for one channel */ writel(channel << STM32H7_SQ1_SHIFT, adc->regs + STM32H7_ADC_SQR1); - /* Trigger detection disabled (conversion can be launched in SW) */ - clrbits_le32(adc->regs + STM32H7_ADC_CFGR, STM32H7_EXTEN | - STM32H7_DMNGT); + /* + * Trigger detection disabled (conversion can be launched in SW) + * STM32H7_DMNGT is equivalent to STM32MP13_DMAEN & STM32MP13_DMACFG + */ + clrbits_le32(adc->regs + STM32H7_ADC_CFGR, STM32H7_EXTEN | STM32H7_DMNGT); adc->active_channel = channel; return 0; @@ -206,7 +247,7 @@ static int stm32_adc_selfcalib(struct udevice *dev) { struct stm32_adc *adc = dev_get_priv(dev); int ret; - u32 val; + u32 val, mask; /* * Select calibration mode: @@ -231,7 +272,10 @@ static int stm32_adc_selfcalib(struct udevice *dev) * - Linearity calibration (needs to be done only once for single/diff) * will run simultaneously with offset calibration. */ - setbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_ADCALDIF | STM32H7_ADCALLIN); + mask = STM32H7_ADCALDIF; + if (adc->cfg->has_linearcal) + mask |= STM32H7_ADCALLIN; + setbits_le32(adc->regs + STM32H7_ADC_CR, mask); /* Start calibration, then wait for completion */ setbits_le32(adc->regs + STM32H7_ADC_CR, STM32H7_ADCAL); @@ -394,14 +438,28 @@ static const struct adc_ops stm32_adc_ops = { }; static const struct stm32_adc_cfg stm32h7_adc_cfg = { + .regs = &stm32h7_adc_regspec, .num_bits = 16, .max_channels = STM32_ADC_CH_MAX, + .has_boostmode = true, + .has_linearcal = true, + .has_presel = true, }; static const struct stm32_adc_cfg stm32mp1_adc_cfg = { + .regs = &stm32h7_adc_regspec, .num_bits = 16, .max_channels = STM32_ADC_CH_MAX, .has_vregready = true, + .has_boostmode = true, + .has_linearcal = true, + .has_presel = true, +}; + +static const struct stm32_adc_cfg stm32mp13_adc_cfg = { + .regs = &stm32mp13_adc_regspec, + .num_bits = 12, + .max_channels = STM32_ADC_CH_MAX - 1, }; static const struct udevice_id stm32_adc_ids[] = { @@ -409,6 +467,8 @@ static const struct udevice_id stm32_adc_ids[] = { .data = (ulong)&stm32h7_adc_cfg }, { .compatible = "st,stm32mp1-adc", .data = (ulong)&stm32mp1_adc_cfg }, + { .compatible = "st,stm32mp13-adc", + .data = (ulong)&stm32mp13_adc_cfg }, {} }; 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