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rtc: stm32: add alarm A out feature

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STM32 RTC can pulse some SOC pins when an RTC alarm expires.
This patch adds this functionality for alarm A. The pulse can out on three
pins RTC_OUT1, RTC_OUT2, RTC_OUT2_RMP (PC13, PB2, PI8 on stm32mp15)
(PC13, PB2, PI1 on stm32mp13) (PC13, PF4/PF6, PI8 on stm32mp25).

This patch only adds the functionality for devices which are using
st,stm32mp1-rtc and st,stm32mp25-rtc compatible.

Add "alarm-a" in pinmux functions.

Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240722160022.454226-5-valentin.caron@foss.st.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Valentin Caron 2024-07-22 18:00:22 +02:00 • committed by Alexandre Belloni
parent bb7b0df2be
commit 04dcadb87d
1 changed files with 60 additions and 0 deletions
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60
drivers/rtc/rtc-stm32.c
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@ -47,8 +47,10 @@
#define STM32_RTC_CR_ALRAE BIT(8) #define STM32_RTC_CR_ALRAE BIT(8)
#define STM32_RTC_CR_ALRAIE BIT(12) #define STM32_RTC_CR_ALRAIE BIT(12)
#define STM32_RTC_CR_OSEL GENMASK(22, 21) #define STM32_RTC_CR_OSEL GENMASK(22, 21)
#define STM32_RTC_CR_OSEL_ALARM_A FIELD_PREP(STM32_RTC_CR_OSEL, 0x01)
#define STM32_RTC_CR_COE BIT(23) #define STM32_RTC_CR_COE BIT(23)
#define STM32_RTC_CR_TAMPOE BIT(26) #define STM32_RTC_CR_TAMPOE BIT(26)
#define STM32_RTC_CR_TAMPALRM_TYPE BIT(30)
#define STM32_RTC_CR_OUT2EN BIT(31) #define STM32_RTC_CR_OUT2EN BIT(31)
/* STM32_RTC_ISR/STM32_RTC_ICSR bit fields */ /* STM32_RTC_ISR/STM32_RTC_ICSR bit fields */
@ -158,6 +160,7 @@ struct stm32_rtc_data {
bool need_accuracy; bool need_accuracy;
bool rif_protected; bool rif_protected;
bool has_lsco; bool has_lsco;
bool has_alarm_out;
}; };
struct stm32_rtc { struct stm32_rtc {
@ -245,6 +248,47 @@ struct stm32_rtc_pinmux_func {
int (*action)(struct pinctrl_dev *pctl_dev, unsigned int pin); int (*action)(struct pinctrl_dev *pctl_dev, unsigned int pin);
}; };
static int stm32_rtc_pinmux_action_alarm(struct pinctrl_dev *pctldev, unsigned int pin)
{
struct stm32_rtc *rtc = pinctrl_dev_get_drvdata(pctldev);
struct stm32_rtc_registers regs = rtc->data->regs;
unsigned int cr = readl_relaxed(rtc->base + regs.cr);
unsigned int cfgr = readl_relaxed(rtc->base + regs.cfgr);
if (!rtc->data->has_alarm_out)
return -EPERM;
cr &= ~STM32_RTC_CR_OSEL;
cr |= STM32_RTC_CR_OSEL_ALARM_A;
cr &= ~STM32_RTC_CR_TAMPOE;
cr &= ~STM32_RTC_CR_COE;
cr &= ~STM32_RTC_CR_TAMPALRM_TYPE;
switch (pin) {
case OUT1:
cr &= ~STM32_RTC_CR_OUT2EN;
cfgr &= ~STM32_RTC_CFGR_OUT2_RMP;
break;
case OUT2:
cr |= STM32_RTC_CR_OUT2EN;
cfgr &= ~STM32_RTC_CFGR_OUT2_RMP;
break;
case OUT2_RMP:
cr |= STM32_RTC_CR_OUT2EN;
cfgr |= STM32_RTC_CFGR_OUT2_RMP;
break;
default:
return -EINVAL;
}
stm32_rtc_wpr_unlock(rtc);
writel_relaxed(cr, rtc->base + regs.cr);
writel_relaxed(cfgr, rtc->base + regs.cfgr);
stm32_rtc_wpr_lock(rtc);
return 0;
}
static int stm32_rtc_pinmux_lsco_available(struct pinctrl_dev *pctldev, unsigned int pin) static int stm32_rtc_pinmux_lsco_available(struct pinctrl_dev *pctldev, unsigned int pin)
{ {
struct stm32_rtc *rtc = pinctrl_dev_get_drvdata(pctldev); struct stm32_rtc *rtc = pinctrl_dev_get_drvdata(pctldev);
@ -307,6 +351,7 @@ static int stm32_rtc_pinmux_action_lsco(struct pinctrl_dev *pctldev, unsigned in
static const struct stm32_rtc_pinmux_func stm32_rtc_pinmux_functions[] = { static const struct stm32_rtc_pinmux_func stm32_rtc_pinmux_functions[] = {
STM32_RTC_PINMUX("lsco", &stm32_rtc_pinmux_action_lsco, "out1", "out2_rmp"), STM32_RTC_PINMUX("lsco", &stm32_rtc_pinmux_action_lsco, "out1", "out2_rmp"),
STM32_RTC_PINMUX("alarm-a", &stm32_rtc_pinmux_action_alarm, "out1", "out2", "out2_rmp"),
}; };
static int stm32_rtc_pinmux_get_functions_count(struct pinctrl_dev *pctldev) static int stm32_rtc_pinmux_get_functions_count(struct pinctrl_dev *pctldev)
@ -763,6 +808,7 @@ static const struct stm32_rtc_data stm32_rtc_data = {
.need_accuracy = false, .need_accuracy = false,
.rif_protected = false, .rif_protected = false,
.has_lsco = false, .has_lsco = false,
.has_alarm_out = false,
.regs = { .regs = {
.tr = 0x00, .tr = 0x00,
.dr = 0x04, .dr = 0x04,
@ -788,6 +834,7 @@ static const struct stm32_rtc_data stm32h7_rtc_data = {
.need_accuracy = false, .need_accuracy = false,
.rif_protected = false, .rif_protected = false,
.has_lsco = false, .has_lsco = false,
.has_alarm_out = false,
.regs = { .regs = {
.tr = 0x00, .tr = 0x00,
.dr = 0x04, .dr = 0x04,
@ -822,6 +869,7 @@ static const struct stm32_rtc_data stm32mp1_data = {
.need_accuracy = true, .need_accuracy = true,
.rif_protected = false, .rif_protected = false,
.has_lsco = true, .has_lsco = true,
.has_alarm_out = true,
.regs = { .regs = {
.tr = 0x00, .tr = 0x00,
.dr = 0x04, .dr = 0x04,
@ -847,6 +895,7 @@ static const struct stm32_rtc_data stm32mp25_data = {
.need_accuracy = true, .need_accuracy = true,
.rif_protected = true, .rif_protected = true,
.has_lsco = true, .has_lsco = true,
.has_alarm_out = true,
.regs = { .regs = {
.tr = 0x00, .tr = 0x00,
.dr = 0x04, .dr = 0x04,
@ -878,6 +927,17 @@ MODULE_DEVICE_TABLE(of, stm32_rtc_of_match);
static void stm32_rtc_clean_outs(struct stm32_rtc *rtc) static void stm32_rtc_clean_outs(struct stm32_rtc *rtc)
{ {
struct stm32_rtc_registers regs = rtc->data->regs; struct stm32_rtc_registers regs = rtc->data->regs;
unsigned int cr = readl_relaxed(rtc->base + regs.cr);
cr &= ~STM32_RTC_CR_OSEL;
cr &= ~STM32_RTC_CR_TAMPOE;
cr &= ~STM32_RTC_CR_COE;
cr &= ~STM32_RTC_CR_TAMPALRM_TYPE;
cr &= ~STM32_RTC_CR_OUT2EN;
stm32_rtc_wpr_unlock(rtc);
writel_relaxed(cr, rtc->base + regs.cr);
stm32_rtc_wpr_lock(rtc);
if (regs.cfgr != UNDEF_REG) { if (regs.cfgr != UNDEF_REG) {
unsigned int cfgr = readl_relaxed(rtc->base + regs.cfgr); unsigned int cfgr = readl_relaxed(rtc->base + regs.cfgr);