// SPDX-License-Identifier: GPL-2.0
/*
* This file is part of STM32 ADC driver
*
* Copyright ( C ) 2016 , STMicroelectronics - All Rights Reserved
* Author : Fabrice Gasnier < fabrice . gasnier @ st . com > .
*
* Inspired from : fsl - imx25 - tsadc
*
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdesc.h>
#include <linux/irqdomain.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/units.h>
#include "stm32-adc-core.h"
#define STM32_ADC_CORE_SLEEP_DELAY_MS 2000
/* SYSCFG registers */
#define STM32MP1_SYSCFG_PMCSETR 0 x04
#define STM32MP1_SYSCFG_PMCCLRR 0 x44
/* SYSCFG bit fields */
#define STM32MP1_SYSCFG_ANASWVDD_MASK BIT(9 )
/* SYSCFG capability flags */
#define HAS_VBOOSTER BIT(0 )
#define HAS_ANASWVDD BIT(1 )
/**
* struct stm32_adc_common_regs - stm32 common registers
* @ csr : common status register offset
* @ ccr : common control register offset
* @ eoc_msk : array of eoc ( end of conversion flag ) masks in csr for adc1 . . n
* @ ovr_msk : array of ovr ( overrun flag ) masks in csr for adc1 . . n
* @ ier : interrupt enable register offset for each adc
* @ eocie_msk : end of conversion interrupt enable mask in @ ier
*/
struct stm32_adc_common_regs {
u32 csr;
u32 ccr;
u32 eoc_msk[STM32_ADC_MAX_ADCS];
u32 ovr_msk[STM32_ADC_MAX_ADCS];
u32 ier;
u32 eocie_msk;
};
struct stm32_adc_priv;
/**
* struct stm32_adc_priv_cfg - stm32 core compatible configuration data
* @ regs : common registers for all instances
* @ clk_sel : clock selection routine
* @ max_clk_rate_hz : maximum analog clock rate ( Hz , from datasheet )
* @ ipid : adc identification number
* @ has_syscfg : SYSCFG capability flags
* @ num_irqs : number of interrupt lines
* @ num_adcs : maximum number of ADC instances in the common registers
*/
struct stm32_adc_priv_cfg {
const struct stm32_adc_common_regs *regs;
int (*clk_sel)(struct platform_device *, struct stm32_adc_priv *);
u32 max_clk_rate_hz;
u32 ipid;
unsigned int has_syscfg;
unsigned int num_irqs;
unsigned int num_adcs;
};
/**
* struct stm32_adc_priv - stm32 ADC core private data
* @ irq : irq ( s ) for ADC block
* @ nb_adc_max : actual maximum number of instance per ADC block
* @ domain : irq domain reference
* @ aclk : clock reference for the analog circuitry
* @ bclk : bus clock common for all ADCs , depends on part used
* @ max_clk_rate : desired maximum clock rate
* @ booster : booster supply reference
* @ vdd : vdd supply reference
* @ vdda : vdda analog supply reference
* @ vref : regulator reference
* @ vdd_uv : vdd supply voltage ( microvolts )
* @ vdda_uv : vdda supply voltage ( microvolts )
* @ cfg : compatible configuration data
* @ common : common data for all ADC instances
* @ ccr_bak : backup CCR in low power mode
* @ syscfg : reference to syscon , system control registers
*/
struct stm32_adc_priv {
int irq[STM32_ADC_MAX_ADCS];
unsigned int nb_adc_max;
struct irq_domain *domain;
struct clk *aclk;
struct clk *bclk;
u32 max_clk_rate;
struct regulator *booster;
struct regulator *vdd;
struct regulator *vdda;
struct regulator *vref;
int vdd_uv;
int vdda_uv;
const struct stm32_adc_priv_cfg *cfg;
struct stm32_adc_common common;
u32 ccr_bak;
struct regmap *syscfg;
};
static struct stm32_adc_priv *to_stm32_adc_priv(struct stm32_adc_common *com)
{
return container_of(com, struct stm32_adc_priv, common);
}
/* STM32F4 ADC internal common clock prescaler division ratios */
static int stm32f4_pclk_div[] = {2 , 4 , 6 , 8 };
/**
* stm32f4_adc_clk_sel ( ) - Select stm32f4 ADC common clock prescaler
* @ pdev : platform device
* @ priv : stm32 ADC core private data
* Select clock prescaler used for analog conversions , before using ADC .
*/
static int stm32f4_adc_clk_sel(struct platform_device *pdev,
struct stm32_adc_priv *priv)
{
unsigned long rate;
u32 val;
int i;
/* stm32f4 has one clk input for analog (mandatory), enforce it here */
if (!priv->aclk) {
dev_err(&pdev->dev, "No 'adc' clock found\n" );
return -ENOENT;
}
rate = clk_get_rate(priv->aclk);
if (!rate) {
dev_err(&pdev->dev, "Invalid clock rate: 0\n" );
return -EINVAL;
}
for (i = 0 ; i < ARRAY_SIZE(stm32f4_pclk_div); i++) {
if ((rate / stm32f4_pclk_div[i]) <= priv->max_clk_rate)
break ;
}
if (i >= ARRAY_SIZE(stm32f4_pclk_div)) {
dev_err(&pdev->dev, "adc clk selection failed\n" );
return -EINVAL;
}
priv->common.rate = rate / stm32f4_pclk_div[i];
val = readl_relaxed(priv->common.base + STM32F4_ADC_CCR);
val &= ~STM32F4_ADC_ADCPRE_MASK;
val |= i << STM32F4_ADC_ADCPRE_SHIFT;
writel_relaxed(val, priv->common.base + STM32F4_ADC_CCR);
dev_dbg(&pdev->dev, "Using analog clock source at %ld kHz\n" ,
priv->common.rate / 1000 );
return 0 ;
}
/**
* struct stm32h7_adc_ck_spec - specification for stm32h7 adc clock
* @ ckmode : ADC clock mode , Async or sync with prescaler .
* @ presc : prescaler bitfield for async clock mode
* @ div : prescaler division ratio
*/
struct stm32h7_adc_ck_spec {
u32 ckmode;
u32 presc;
int div;
};
static const struct stm32h7_adc_ck_spec stm32h7_adc_ckmodes_spec[] = {
/* 00: CK_ADC[1..3]: Asynchronous clock modes */
{ 0 , 0 , 1 },
{ 0 , 1 , 2 },
{ 0 , 2 , 4 },
{ 0 , 3 , 6 },
{ 0 , 4 , 8 },
{ 0 , 5 , 10 },
{ 0 , 6 , 12 },
{ 0 , 7 , 16 },
{ 0 , 8 , 32 },
{ 0 , 9 , 64 },
{ 0 , 10 , 128 },
{ 0 , 11 , 256 },
/* HCLK used: Synchronous clock modes (1, 2 or 4 prescaler) */
{ 1 , 0 , 1 },
{ 2 , 0 , 2 },
{ 3 , 0 , 4 },
};
static int stm32h7_adc_clk_sel(struct platform_device *pdev,
struct stm32_adc_priv *priv)
{
u32 ckmode, presc, val;
unsigned long rate;
int i, div, duty;
/* stm32h7 bus clock is common for all ADC instances (mandatory) */
if (!priv->bclk) {
dev_err(&pdev->dev, "No 'bus' clock found\n" );
return -ENOENT;
}
/*
* stm32h7 can use either ' bus ' or ' adc ' clock for analog circuitry .
* So , choice is to have bus clock mandatory and adc clock optional .
* If optional ' adc ' clock has been found , then try to use it first .
*/
if (priv->aclk) {
/*
* Asynchronous clock modes ( e . g . ckmode = = 0 )
* From spec : PLL output musn ' t exceed max rate
*/
rate = clk_get_rate(priv->aclk);
if (!rate) {
dev_err(&pdev->dev, "Invalid adc clock rate: 0\n" );
return -EINVAL;
}
/* If duty is an error, kindly use at least /2 divider */
duty = clk_get_scaled_duty_cycle(priv->aclk, 100 );
if (duty < 0 )
dev_warn(&pdev->dev, "adc clock duty: %d\n" , duty);
for (i = 0 ; i < ARRAY_SIZE(stm32h7_adc_ckmodes_spec); i++) {
ckmode = stm32h7_adc_ckmodes_spec[i].ckmode;
presc = stm32h7_adc_ckmodes_spec[i].presc;
div = stm32h7_adc_ckmodes_spec[i].div;
if (ckmode)
continue ;
/*
* For proper operation , clock duty cycle range is 49 %
* to 51 % . Apply at least / 2 prescaler otherwise .
*/
if (div == 1 && (duty < 49 || duty > 51 ))
continue ;
if ((rate / div) <= priv->max_clk_rate)
goto out;
}
}
/* Synchronous clock modes (e.g. ckmode is 1, 2 or 3) */
rate = clk_get_rate(priv->bclk);
if (!rate) {
dev_err(&pdev->dev, "Invalid bus clock rate: 0\n" );
return -EINVAL;
}
duty = clk_get_scaled_duty_cycle(priv->bclk, 100 );
if (duty < 0 )
dev_warn(&pdev->dev, "bus clock duty: %d\n" , duty);
for (i = 0 ; i < ARRAY_SIZE(stm32h7_adc_ckmodes_spec); i++) {
ckmode = stm32h7_adc_ckmodes_spec[i].ckmode;
presc = stm32h7_adc_ckmodes_spec[i].presc;
div = stm32h7_adc_ckmodes_spec[i].div;
if (!ckmode)
continue ;
if (div == 1 && (duty < 49 || duty > 51 ))
continue ;
if ((rate / div) <= priv->max_clk_rate)
goto out;
}
dev_err(&pdev->dev, "adc clk selection failed\n" );
return -EINVAL;
out:
/* rate used later by each ADC instance to control BOOST mode */
priv->common.rate = rate / div;
/* Set common clock mode and prescaler */
val = readl_relaxed(priv->common.base + STM32H7_ADC_CCR);
val &= ~(STM32H7_CKMODE_MASK | STM32H7_PRESC_MASK);
val |= ckmode << STM32H7_CKMODE_SHIFT;
val |= presc << STM32H7_PRESC_SHIFT;
writel_relaxed(val, priv->common.base + STM32H7_ADC_CCR);
dev_dbg(&pdev->dev, "Using %s clock/%d source at %ld kHz\n" ,
ckmode ? "bus" : "adc" , div, priv->common.rate / 1000 );
return 0 ;
}
/* STM32F4 common registers definitions */
static const struct stm32_adc_common_regs stm32f4_adc_common_regs = {
.csr = STM32F4_ADC_CSR,
.ccr = STM32F4_ADC_CCR,
.eoc_msk = { STM32F4_EOC1, STM32F4_EOC2, STM32F4_EOC3 },
.ovr_msk = { STM32F4_OVR1, STM32F4_OVR2, STM32F4_OVR3 },
.ier = STM32F4_ADC_CR1,
.eocie_msk = STM32F4_EOCIE,
};
/* STM32H7 common registers definitions */
static const struct stm32_adc_common_regs stm32h7_adc_common_regs = {
.csr = STM32H7_ADC_CSR,
.ccr = STM32H7_ADC_CCR,
.eoc_msk = { STM32H7_EOC_MST, STM32H7_EOC_SLV },
.ovr_msk = { STM32H7_OVR_MST, STM32H7_OVR_SLV },
.ier = STM32H7_ADC_IER,
.eocie_msk = STM32H7_EOCIE,
};
/* STM32MP13 common registers definitions */
static const struct stm32_adc_common_regs stm32mp13_adc_common_regs = {
.csr = STM32H7_ADC_CSR,
.ccr = STM32H7_ADC_CCR,
.eoc_msk = { STM32H7_EOC_MST },
.ovr_msk = { STM32H7_OVR_MST },
.ier = STM32H7_ADC_IER,
.eocie_msk = STM32H7_EOCIE,
};
static const unsigned int stm32_adc_offset[STM32_ADC_MAX_ADCS] = {
0 , STM32_ADC_OFFSET, STM32_ADC_OFFSET * 2 ,
};
static unsigned int stm32_adc_eoc_enabled(struct stm32_adc_priv *priv,
unsigned int adc)
{
u32 ier, offset = stm32_adc_offset[adc];
ier = readl_relaxed(priv->common.base + offset + priv->cfg->regs->ier);
return ier & priv->cfg->regs->eocie_msk;
}
/* ADC common interrupt for all instances */
static void stm32_adc_irq_handler(struct irq_desc *desc)
{
struct stm32_adc_priv *priv = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
int i;
u32 status;
chained_irq_enter(chip, desc);
status = readl_relaxed(priv->common.base + priv->cfg->regs->csr);
/*
* End of conversion may be handled by using IRQ or DMA . There may be a
* race here when two conversions complete at the same time on several
* ADCs . EOC may be read ' set ' for several ADCs , with :
* - an ADC configured to use DMA ( EOC triggers the DMA request , and
* is then automatically cleared by DR read in hardware )
* - an ADC configured to use IRQs ( EOCIE bit is set . The handler must
* be called in this case )
* So both EOC status bit in CSR and EOCIE control bit must be checked
* before invoking the interrupt handler ( e . g . call ISR only for
* IRQ - enabled ADCs ) .
*/
for (i = 0 ; i < priv->nb_adc_max; i++) {
if ((status & priv->cfg->regs->eoc_msk[i] &&
stm32_adc_eoc_enabled(priv, i)) ||
(status & priv->cfg->regs->ovr_msk[i]))
generic_handle_domain_irq(priv->domain, i);
}
chained_irq_exit(chip, desc);
};
static int stm32_adc_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_chip_data(irq, d->host_data);
irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_level_irq);
return 0 ;
}
static void stm32_adc_domain_unmap(struct irq_domain *d, unsigned int irq)
{
irq_set_chip_and_handler(irq, NULL, NULL);
irq_set_chip_data(irq, NULL);
}
static const struct irq_domain_ops stm32_adc_domain_ops = {
.map = stm32_adc_domain_map,
.unmap = stm32_adc_domain_unmap,
.xlate = irq_domain_xlate_onecell,
};
static int stm32_adc_irq_probe(struct platform_device *pdev,
struct stm32_adc_priv *priv)
{
unsigned int i;
/*
* Interrupt ( s ) must be provided , depending on the compatible :
* - stm32f4 / h7 shares a common interrupt line .
* - stm32mp1 , has one line per ADC
*/
for (i = 0 ; i < priv->cfg->num_irqs; i++) {
priv->irq[i] = platform_get_irq(pdev, i);
if (priv->irq[i] < 0 )
return priv->irq[i];
}
priv->domain = irq_domain_create_simple(dev_fwnode(&pdev->dev),
STM32_ADC_MAX_ADCS, 0 ,
&stm32_adc_domain_ops,
priv);
if (!priv->domain) {
dev_err(&pdev->dev, "Failed to add irq domain\n" );
return -ENOMEM;
}
for (i = 0 ; i < priv->cfg->num_irqs; i++)
irq_set_chained_handler_and_data(priv->irq[i],
stm32_adc_irq_handler, priv);
return 0 ;
}
static void stm32_adc_irq_remove(struct platform_device *pdev,
struct stm32_adc_priv *priv)
{
int hwirq;
unsigned int i;
for (hwirq = 0 ; hwirq < priv->nb_adc_max; hwirq++)
irq_dispose_mapping(irq_find_mapping(priv->domain, hwirq));
irq_domain_remove(priv->domain);
for (i = 0 ; i < priv->cfg->num_irqs; i++)
irq_set_chained_handler(priv->irq[i], NULL);
}
static int stm32_adc_core_switches_supply_en(struct stm32_adc_priv *priv,
struct device *dev)
{
int ret;
/*
* On STM32H7 and STM32MP1 , the ADC inputs are multiplexed with analog
* switches ( via PCSEL ) which have reduced performances when their
* supply is below 2 . 7 V ( vdda by default ) :
* - Voltage booster can be used , to get full ADC performances
* ( increases power consumption ) .
* - Vdd can be used to supply them , if above 2 . 7 V ( STM32MP1 only ) .
*
* Recommended settings for ANASWVDD and EN_BOOSTER :
* - vdda < 2 . 7 V but vdd > 2 . 7 V : ANASWVDD = 1 , EN_BOOSTER = 0 ( stm32mp1 )
* - vdda < 2 . 7 V and vdd < 2 . 7 V : ANASWVDD = 0 , EN_BOOSTER = 1
* - vdda > = 2 . 7 V : ANASWVDD = 0 , EN_BOOSTER = 0 ( default )
*/
if (priv->vdda_uv < 2700000 ) {
if (priv->syscfg && priv->vdd_uv > 2700000 ) {
ret = regulator_enable(priv->vdd);
if (ret < 0 ) {
dev_err(dev, "vdd enable failed %d\n" , ret);
return ret;
}
ret = regmap_write(priv->syscfg,
STM32MP1_SYSCFG_PMCSETR,
STM32MP1_SYSCFG_ANASWVDD_MASK);
if (ret < 0 ) {
regulator_disable(priv->vdd);
dev_err(dev, "vdd select failed, %d\n" , ret);
return ret;
}
dev_dbg(dev, "analog switches supplied by vdd\n" );
return 0 ;
}
if (priv->booster) {
/*
* This is optional , as this is a trade - off between
* analog performance and power consumption .
*/
ret = regulator_enable(priv->booster);
if (ret < 0 ) {
dev_err(dev, "booster enable failed %d\n" , ret);
return ret;
}
dev_dbg(dev, "analog switches supplied by booster\n" );
return 0 ;
}
}
/* Fallback using vdda (default), nothing to do */
dev_dbg(dev, "analog switches supplied by vdda (%d uV)\n" ,
priv->vdda_uv);
return 0 ;
}
static void stm32_adc_core_switches_supply_dis(struct stm32_adc_priv *priv)
{
if (priv->vdda_uv < 2700000 ) {
if (priv->syscfg && priv->vdd_uv > 2700000 ) {
regmap_write(priv->syscfg, STM32MP1_SYSCFG_PMCCLRR,
STM32MP1_SYSCFG_ANASWVDD_MASK);
regulator_disable(priv->vdd);
return ;
}
if (priv->booster)
regulator_disable(priv->booster);
}
}
static int stm32_adc_core_hw_start(struct device *dev)
{
struct stm32_adc_common *common = dev_get_drvdata(dev);
struct stm32_adc_priv *priv = to_stm32_adc_priv(common);
int ret;
ret = regulator_enable(priv->vdda);
if (ret < 0 ) {
dev_err(dev, "vdda enable failed %d\n" , ret);
return ret;
}
ret = regulator_get_voltage(priv->vdda);
if (ret < 0 ) {
dev_err(dev, "vdda get voltage failed, %d\n" , ret);
goto err_vdda_disable;
}
priv->vdda_uv = ret;
ret = stm32_adc_core_switches_supply_en(priv, dev);
if (ret < 0 )
goto err_vdda_disable;
ret = regulator_enable(priv->vref);
if (ret < 0 ) {
dev_err(dev, "vref enable failed\n" );
goto err_switches_dis;
}
ret = clk_prepare_enable(priv->bclk);
if (ret < 0 ) {
dev_err(dev, "bus clk enable failed\n" );
goto err_regulator_disable;
}
ret = clk_prepare_enable(priv->aclk);
if (ret < 0 ) {
dev_err(dev, "adc clk enable failed\n" );
goto err_bclk_disable;
}
writel_relaxed(priv->ccr_bak, priv->common.base + priv->cfg->regs->ccr);
return 0 ;
err_bclk_disable:
clk_disable_unprepare(priv->bclk);
err_regulator_disable:
regulator_disable(priv->vref);
err_switches_dis:
stm32_adc_core_switches_supply_dis(priv);
err_vdda_disable:
regulator_disable(priv->vdda);
return ret;
}
static void stm32_adc_core_hw_stop(struct device *dev)
{
struct stm32_adc_common *common = dev_get_drvdata(dev);
struct stm32_adc_priv *priv = to_stm32_adc_priv(common);
/* Backup CCR that may be lost (depends on power state to achieve) */
priv->ccr_bak = readl_relaxed(priv->common.base + priv->cfg->regs->ccr);
clk_disable_unprepare(priv->aclk);
clk_disable_unprepare(priv->bclk);
regulator_disable(priv->vref);
stm32_adc_core_switches_supply_dis(priv);
regulator_disable(priv->vdda);
}
static int stm32_adc_core_switches_probe(struct device *dev,
struct stm32_adc_priv *priv)
{
struct device_node *np = dev->of_node;
int ret;
/* Analog switches supply can be controlled by syscfg (optional) */
priv->syscfg = syscon_regmap_lookup_by_phandle(np, "st,syscfg" );
if (IS_ERR(priv->syscfg)) {
ret = PTR_ERR(priv->syscfg);
if (ret != -ENODEV)
return dev_err_probe(dev, ret, "Can't probe syscfg\n" );
priv->syscfg = NULL;
}
/* Booster can be used to supply analog switches (optional) */
if (priv->cfg->has_syscfg & HAS_VBOOSTER) {
priv->booster = devm_regulator_get_optional(dev, "booster" );
if (IS_ERR(priv->booster)) {
ret = PTR_ERR(priv->booster);
if (ret != -ENODEV)
return dev_err_probe(dev, ret, "can't get booster\n" );
priv->booster = NULL;
}
}
/* Vdd can be used to supply analog switches (optional) */
if (priv->cfg->has_syscfg & HAS_ANASWVDD) {
priv->vdd = devm_regulator_get_optional(dev, "vdd" );
if (IS_ERR(priv->vdd)) {
ret = PTR_ERR(priv->vdd);
if (ret != -ENODEV)
return dev_err_probe(dev, ret, "can't get vdd\n" );
priv->vdd = NULL;
}
}
if (priv->vdd) {
ret = regulator_enable(priv->vdd);
if (ret < 0 ) {
dev_err(dev, "vdd enable failed %d\n" , ret);
return ret;
}
ret = regulator_get_voltage(priv->vdd);
if (ret < 0 ) {
dev_err(dev, "vdd get voltage failed %d\n" , ret);
regulator_disable(priv->vdd);
return ret;
}
priv->vdd_uv = ret;
regulator_disable(priv->vdd);
}
return 0 ;
}
static int stm32_adc_probe_identification(struct platform_device *pdev,
struct stm32_adc_priv *priv)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
const char *compat;
int ret, count = 0 ;
u32 id, val;
if (!priv->cfg->ipid)
return 0 ;
id = FIELD_GET(STM32MP1_IPIDR_MASK,
readl_relaxed(priv->common.base + STM32MP1_ADC_IPDR));
if (id != priv->cfg->ipid) {
dev_err(&pdev->dev, "Unexpected IP version: 0x%x" , id);
return -EINVAL;
}
for_each_child_of_node(np, child) {
ret = of_property_read_string(child, "compatible" , &compat);
if (ret)
continue ;
/* Count child nodes with stm32 adc compatible */
if (strstr(compat, "st,stm32" ) && strstr(compat, "adc" ))
count++;
}
val = readl_relaxed(priv->common.base + STM32MP1_ADC_HWCFGR0);
priv->nb_adc_max = FIELD_GET(STM32MP1_ADCNUM_MASK, val);
if (count > priv->nb_adc_max) {
dev_err(&pdev->dev, "Unexpected child number: %d" , count);
return -EINVAL;
}
val = readl_relaxed(priv->common.base + STM32MP1_ADC_VERR);
dev_dbg(&pdev->dev, "ADC version: %lu.%lu\n" ,
FIELD_GET(STM32MP1_MAJREV_MASK, val),
FIELD_GET(STM32MP1_MINREV_MASK, val));
return 0 ;
}
static int stm32_adc_probe(struct platform_device *pdev)
{
struct stm32_adc_priv *priv;
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
struct resource *res;
u32 max_rate;
int ret;
if (!pdev->dev.of_node)
return -ENODEV;
priv = devm_kzalloc(&pdev->dev, sizeof (*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, &priv->common);
priv->cfg = device_get_match_data(dev);
priv->nb_adc_max = priv->cfg->num_adcs;
spin_lock_init(&priv->common.lock);
priv->common.base = devm_platform_get_and_ioremap_resource(pdev, 0 , &res);
if (IS_ERR(priv->common.base))
return PTR_ERR(priv->common.base);
priv->common.phys_base = res->start;
priv->vdda = devm_regulator_get(&pdev->dev, "vdda" );
if (IS_ERR(priv->vdda))
return dev_err_probe(&pdev->dev, PTR_ERR(priv->vdda),
"vdda get failed\n" );
priv->vref = devm_regulator_get(&pdev->dev, "vref" );
if (IS_ERR(priv->vref))
return dev_err_probe(&pdev->dev, PTR_ERR(priv->vref),
"vref get failed\n" );
priv->aclk = devm_clk_get_optional(&pdev->dev, "adc" );
if (IS_ERR(priv->aclk))
return dev_err_probe(&pdev->dev, PTR_ERR(priv->aclk),
"Can't get 'adc' clock\n" );
priv->bclk = devm_clk_get_optional(&pdev->dev, "bus" );
if (IS_ERR(priv->bclk))
return dev_err_probe(&pdev->dev, PTR_ERR(priv->bclk),
"Can't get 'bus' clock\n" );
ret = stm32_adc_core_switches_probe(dev, priv);
if (ret)
return ret;
pm_runtime_get_noresume(dev);
pm_runtime_set_active(dev);
pm_runtime_set_autosuspend_delay(dev, STM32_ADC_CORE_SLEEP_DELAY_MS);
pm_runtime_use_autosuspend(dev);
pm_runtime_enable(dev);
ret = stm32_adc_core_hw_start(dev);
if (ret)
goto err_pm_stop;
ret = stm32_adc_probe_identification(pdev, priv);
if (ret < 0 )
goto err_hw_stop;
ret = regulator_get_voltage(priv->vref);
if (ret < 0 ) {
dev_err(&pdev->dev, "vref get voltage failed, %d\n" , ret);
goto err_hw_stop;
}
priv->common.vref_mv = ret / 1000 ;
dev_dbg(&pdev->dev, "vref+=%dmV\n" , priv->common.vref_mv);
ret = of_property_read_u32(pdev->dev.of_node, "st,max-clk-rate-hz" ,
&max_rate);
if (!ret)
priv->max_clk_rate = min(max_rate, priv->cfg->max_clk_rate_hz);
else
priv->max_clk_rate = priv->cfg->max_clk_rate_hz;
ret = priv->cfg->clk_sel(pdev, priv);
if (ret < 0 )
goto err_hw_stop;
ret = stm32_adc_irq_probe(pdev, priv);
if (ret < 0 )
goto err_hw_stop;
ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
if (ret < 0 ) {
dev_err(&pdev->dev, "failed to populate DT children\n" );
goto err_irq_remove;
}
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return 0 ;
err_irq_remove:
stm32_adc_irq_remove(pdev, priv);
err_hw_stop:
stm32_adc_core_hw_stop(dev);
err_pm_stop:
pm_runtime_disable(dev);
pm_runtime_set_suspended(dev);
pm_runtime_put_noidle(dev);
return ret;
}
static void stm32_adc_remove(struct platform_device *pdev)
{
struct stm32_adc_common *common = platform_get_drvdata(pdev);
struct stm32_adc_priv *priv = to_stm32_adc_priv(common);
pm_runtime_get_sync(&pdev->dev);
of_platform_depopulate(&pdev->dev);
stm32_adc_irq_remove(pdev, priv);
stm32_adc_core_hw_stop(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
}
static int stm32_adc_core_runtime_suspend(struct device *dev)
{
stm32_adc_core_hw_stop(dev);
return 0 ;
}
static int stm32_adc_core_runtime_resume(struct device *dev)
{
return stm32_adc_core_hw_start(dev);
}
static int stm32_adc_core_runtime_idle(struct device *dev)
{
pm_runtime_mark_last_busy(dev);
return 0 ;
}
static DEFINE_RUNTIME_DEV_PM_OPS(stm32_adc_core_pm_ops,
stm32_adc_core_runtime_suspend,
stm32_adc_core_runtime_resume,
stm32_adc_core_runtime_idle);
static const struct stm32_adc_priv_cfg stm32f4_adc_priv_cfg = {
.regs = &stm32f4_adc_common_regs,
.clk_sel = stm32f4_adc_clk_sel,
.max_clk_rate_hz = 36000000 ,
.num_irqs = 1 ,
.num_adcs = 3 ,
};
static const struct stm32_adc_priv_cfg stm32h7_adc_priv_cfg = {
.regs = &stm32h7_adc_common_regs,
.clk_sel = stm32h7_adc_clk_sel,
.max_clk_rate_hz = 36000000 ,
.has_syscfg = HAS_VBOOSTER,
.num_irqs = 1 ,
.num_adcs = 2 ,
};
static const struct stm32_adc_priv_cfg stm32mp1_adc_priv_cfg = {
.regs = &stm32h7_adc_common_regs,
.clk_sel = stm32h7_adc_clk_sel,
.max_clk_rate_hz = 36000000 ,
.has_syscfg = HAS_VBOOSTER | HAS_ANASWVDD,
.ipid = STM32MP15_IPIDR_NUMBER,
.num_irqs = 2 ,
};
static const struct stm32_adc_priv_cfg stm32mp13_adc_priv_cfg = {
.regs = &stm32mp13_adc_common_regs,
.clk_sel = stm32h7_adc_clk_sel,
.max_clk_rate_hz = 75 * HZ_PER_MHZ,
.ipid = STM32MP13_IPIDR_NUMBER,
.num_irqs = 1 ,
};
static const struct of_device_id stm32_adc_of_match[] = {
{
.compatible = "st,stm32f4-adc-core" ,
.data = (void *)&stm32f4_adc_priv_cfg
}, {
.compatible = "st,stm32h7-adc-core" ,
.data = (void *)&stm32h7_adc_priv_cfg
}, {
.compatible = "st,stm32mp1-adc-core" ,
.data = (void *)&stm32mp1_adc_priv_cfg
}, {
.compatible = "st,stm32mp13-adc-core" ,
.data = (void *)&stm32mp13_adc_priv_cfg
}, {
},
};
MODULE_DEVICE_TABLE(of, stm32_adc_of_match);
static struct platform_driver stm32_adc_driver = {
.probe = stm32_adc_probe,
.remove = stm32_adc_remove,
.driver = {
.name = "stm32-adc-core" ,
.of_match_table = stm32_adc_of_match,
.pm = pm_ptr(&stm32_adc_core_pm_ops),
},
};
module_platform_driver(stm32_adc_driver);
MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>" );
MODULE_DESCRIPTION("STMicroelectronics STM32 ADC core driver" );
MODULE_LICENSE("GPL v2" );
MODULE_ALIAS("platform:stm32-adc-core" );
Messung V0.5 in Prozent C=97 H=88 G=92
¤ Dauer der Verarbeitung: 0.15 Sekunden
(vorverarbeitet am 2026-09-28)
¤
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