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meta-st-stm32mp/recipes-kernel/linux/linux-stm32mp/5.4/5.4.56/0011-ARM-stm32mp1-r2-RESET-...

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From 60ca74ac3c89a476b38d4f41c3bea3745779587e Mon Sep 17 00:00:00 2001
From: Lionel VITTE <lionel.vitte@st.com>
Date: Mon, 5 Oct 2020 13:19:46 +0200
Subject: [PATCH 11/22] ARM-stm32mp1-r2-rc8-RESET-RTC-WATCHDOG
---
.../devicetree/bindings/rtc/st,stm32-rtc.txt | 10 +-
drivers/reset/reset-stm32mp1.c | 83 +++++---
drivers/rtc/Kconfig | 1 +
drivers/rtc/rtc-stm32.c | 180 +++++++++++++++---
drivers/watchdog/stm32_iwdg.c | 6 +-
include/dt-bindings/reset/stm32mp1-resets.h | 15 ++
include/dt-bindings/rtc/rtc-stm32.h | 13 ++
7 files changed, 246 insertions(+), 62 deletions(-)
create mode 100644 include/dt-bindings/rtc/rtc-stm32.h
diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
index 130ca5b982538..bab0df81af2cc 100644
--- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
+++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
@@ -21,9 +21,14 @@ Required properties:
domain (RTC registers) write protection.
It is required on stm32(f4/f7/h7).
-Optional properties (to override default rtc_ck parent clock on stm32(f4/f7/h7):
+Optional properties:
+* to override default rtc_ck parent clock on stm32(f4/f7/h7):
- assigned-clocks: reference to the rtc_ck clock entry.
- assigned-clock-parents: phandle of the new parent clock of rtc_ck.
+* to select and enable RTC Low Speed Clock Output on stm32mp1:
+- st,lsco: defines the RTC output on which RTC Low-Speed Clock is Output. The
+ valid output values are defined in <dt-bindings/rtc/rtc-stm32.h>.
+- pinctrl state named "default" may be defined to reserve pin for RTC output.
Example:
@@ -58,4 +63,7 @@ Example:
clock-names = "pclk", "rtc_ck";
interrupts-extended = <&intc GIC_SPI 3 IRQ_TYPE_NONE>,
<&exti 19 1>;
+ st,lsco = <RTC_OUT2_RMP>;
+ pinctrl-0 = <&rtc_out2_rmp_pins_a>;
+ pinctrl-names = "default";
};
diff --git a/drivers/reset/reset-stm32mp1.c b/drivers/reset/reset-stm32mp1.c
index b221a28041fa0..daf0e26b27a8d 100644
--- a/drivers/reset/reset-stm32mp1.c
+++ b/drivers/reset/reset-stm32mp1.c
@@ -4,14 +4,21 @@
* Author: Gabriel Fernandez <gabriel.fernandez@st.com> for STMicroelectronics.
*/
+#include <dt-bindings/reset/stm32mp1-resets.h>
+#include <linux/arm-smccc.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
+#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
+#include <linux/slab.h>
-#define CLR_OFFSET 0x4
+#define STM32MP1_RESET_ID_MASK GENMASK(15, 0)
+
+#define CLR_OFFSET 0x4
struct stm32_reset_data {
struct reset_controller_dev rcdev;
@@ -79,37 +86,57 @@ static const struct of_device_id stm32_reset_dt_ids[] = {
{ /* sentinel */ },
};
-static int stm32_reset_probe(struct platform_device *pdev)
+static void __init stm32mp1_reset_init(struct device_node *np)
{
- struct device *dev = &pdev->dev;
- struct stm32_reset_data *data;
- void __iomem *membase;
- struct resource *res;
-
- data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ void __iomem *base;
+ const struct of_device_id *match;
+ struct stm32_reset_data *data = NULL;
+ int ret;
+
+ base = of_iomap(np, 0);
+ if (!base) {
+ pr_err("%pOFn: unable to map resource", np);
+ of_node_put(np);
+ return;
+ }
+
+ match = of_match_node(stm32_reset_dt_ids, np);
+ if (!match) {
+ pr_err("%s: match data not found\n", __func__);
+ goto err;
+ }
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
- return -ENOMEM;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- membase = devm_ioremap_resource(dev, res);
- if (IS_ERR(membase))
- return PTR_ERR(membase);
+ goto err;
- data->membase = membase;
+ data->membase = base;
data->rcdev.owner = THIS_MODULE;
- data->rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
data->rcdev.ops = &stm32_reset_ops;
- data->rcdev.of_node = dev->of_node;
-
- return devm_reset_controller_register(dev, &data->rcdev);
+ data->rcdev.of_node = np;
+ data->rcdev.nr_resets = STM32MP1_RESET_ID_MASK;
+
+ ret = reset_controller_register(&data->rcdev);
+ if (!ret)
+ return;
+
+err:
+ pr_err("stm32mp1 reset failed to initialize\n");
+ if (data)
+ kfree(data);
+ if (base)
+ iounmap(base);
+ of_node_put(np);
}
-static struct platform_driver stm32_reset_driver = {
- .probe = stm32_reset_probe,
- .driver = {
- .name = "stm32mp1-reset",
- .of_match_table = stm32_reset_dt_ids,
- },
-};
-
-builtin_platform_driver(stm32_reset_driver);
+/*
+ * RCC reset and clock drivers bind to the same RCC node.
+ * Register RCC reset driver at init through clock of table,
+ * clock driver for RCC will register at probe time.
+ */
+static void __init stm32mp1_reset_of_init_drv(struct device_node *np)
+{
+ of_node_clear_flag(np, OF_POPULATED);
+ stm32mp1_reset_init(np);
+}
+OF_DECLARE_1(clk, stm32mp1_rcc, "st,stm32mp1-rcc", stm32mp1_reset_of_init_drv);
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index c5b9804140860..d590b420525ce 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1862,6 +1862,7 @@ config RTC_DRV_R7301
config RTC_DRV_STM32
tristate "STM32 RTC"
select REGMAP_MMIO
+ depends on COMMON_CLK
depends on ARCH_STM32 || COMPILE_TEST
help
If you say yes here you get support for the STM32 On-Chip
diff --git a/drivers/rtc/rtc-stm32.c b/drivers/rtc/rtc-stm32.c
index 2999e33a7e376..3cf51497681a4 100644
--- a/drivers/rtc/rtc-stm32.c
+++ b/drivers/rtc/rtc-stm32.c
@@ -6,6 +6,8 @@
#include <linux/bcd.h>
#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/errno.h>
#include <linux/iopoll.h>
#include <linux/ioport.h>
#include <linux/mfd/syscon.h>
@@ -15,6 +17,8 @@
#include <linux/regmap.h>
#include <linux/rtc.h>
+#include <dt-bindings/rtc/rtc-stm32.h>
+
#define DRIVER_NAME "stm32_rtc"
/* STM32_RTC_TR bit fields */
@@ -39,6 +43,12 @@
#define STM32_RTC_CR_FMT BIT(6)
#define STM32_RTC_CR_ALRAE BIT(8)
#define STM32_RTC_CR_ALRAIE BIT(12)
+#define STM32_RTC_CR_COSEL BIT(19)
+#define STM32_RTC_CR_OSEL_SHIFT 21
+#define STM32_RTC_CR_OSEL GENMASK(22, 21)
+#define STM32_RTC_CR_COE BIT(23)
+#define STM32_RTC_CR_TAMPOE BIT(26)
+#define STM32_RTC_CR_OUT2EN BIT(31)
/* STM32_RTC_ISR/STM32_RTC_ICSR bit fields */
#define STM32_RTC_ISR_ALRAWF BIT(0)
@@ -75,6 +85,11 @@
/* STM32_RTC_SR/_SCR bit fields */
#define STM32_RTC_SR_ALRA BIT(0)
+/* STM32_RTC_CFGR bit fields */
+#define STM32_RTC_CFGR_OUT2_RMP BIT(0)
+#define STM32_RTC_CFGR_LSCOEN_OUT1 1
+#define STM32_RTC_CFGR_LSCOEN_OUT2_RMP 2
+
/* STM32_RTC_VERR bit fields */
#define STM32_RTC_VERR_MINREV_SHIFT 0
#define STM32_RTC_VERR_MINREV GENMASK(3, 0)
@@ -101,6 +116,7 @@ struct stm32_rtc_registers {
u16 wpr;
u16 sr;
u16 scr;
+ u16 cfgr;
u16 verr;
};
@@ -114,7 +130,8 @@ struct stm32_rtc_data {
void (*clear_events)(struct stm32_rtc *rtc, unsigned int flags);
bool has_pclk;
bool need_dbp;
- bool has_wakeirq;
+ bool has_lsco;
+ bool need_accuracy;
};
struct stm32_rtc {
@@ -127,9 +144,87 @@ struct stm32_rtc {
struct clk *rtc_ck;
const struct stm32_rtc_data *data;
int irq_alarm;
- int wakeirq_alarm;
+ int lsco;
+ struct clk *clk_lsco;
};
+/*
+ * -------------------------------------------------------------------------
+ * | TAMPOE | OSEL[1:0] | COE | OUT2EN | RTC_OUT1 | RTC_OUT2 |
+ * | | | | | | or RTC_OUT2_RMP |
+ * |-------------------------------------------------------------------------|
+ * | 0 | 00 | 0 | 0 or 1 | - | - |
+ * |--------|-----------|-----|--------|------------------|------------------|
+ * | 0 | 00 | 1 | 0 | CALIB | - |
+ * |--------|-----------|-----|--------|------------------|------------------|
+ * | 0 or 1 | !=00 | 0 | 0 | TAMPALRM | - |
+ * |--------|-----------|-----|--------|------------------|------------------|
+ * | 0 | 00 | 1 | 1 | - | CALIB |
+ * |--------|-----------|-----|--------|------------------|------------------|
+ * | 0 or 1 | !=00 | 0 | 1 | - | TAMPALRM |
+ * |--------|-----------|-----|--------|------------------|------------------|
+ * | 0 or 1 | !=00 | 1 | 1 | TAMPALRM | CALIB |
+ * -------------------------------------------------------------------------
+ */
+static int stm32_rtc_clk_lsco_check_availability(struct stm32_rtc *rtc)
+{
+ 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);
+ unsigned int calib = STM32_RTC_CR_COE;
+ unsigned int tampalrm = STM32_RTC_CR_TAMPOE | STM32_RTC_CR_OSEL;
+
+ switch (rtc->lsco) {
+ case RTC_OUT1:
+ if ((!(cr & STM32_RTC_CR_OUT2EN) &&
+ ((cr & calib) || cr & tampalrm)) ||
+ ((cr & calib) && (cr & tampalrm)))
+ return -EBUSY;
+ break;
+ case RTC_OUT2_RMP:
+ if ((cr & STM32_RTC_CR_OUT2EN) &&
+ (cfgr & STM32_RTC_CFGR_OUT2_RMP) &&
+ ((cr & calib) || (cr & tampalrm)))
+ return -EBUSY;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (clk_get_rate(rtc->rtc_ck) != 32768)
+ return -ERANGE;
+
+ return 0;
+}
+
+static int stm32_rtc_clk_lsco_register(struct platform_device *pdev)
+{
+ struct stm32_rtc *rtc = platform_get_drvdata(pdev);
+ struct stm32_rtc_registers regs = rtc->data->regs;
+ u8 lscoen;
+ int ret;
+
+ ret = stm32_rtc_clk_lsco_check_availability(rtc);
+ if (ret)
+ return ret;
+
+ lscoen = (rtc->lsco == RTC_OUT1) ? STM32_RTC_CFGR_LSCOEN_OUT1 :
+ STM32_RTC_CFGR_LSCOEN_OUT2_RMP;
+
+ rtc->clk_lsco = clk_register_gate(&pdev->dev, "rtc_lsco",
+ __clk_get_name(rtc->rtc_ck),
+ CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+ rtc->base + regs.cfgr, lscoen,
+ 0, NULL);
+ if (IS_ERR(rtc->clk_lsco))
+ return PTR_ERR(rtc->clk_lsco);
+
+ of_clk_add_provider(pdev->dev.of_node,
+ of_clk_src_simple_get, rtc->clk_lsco);
+
+ return 0;
+}
+
static void stm32_rtc_wpr_unlock(struct stm32_rtc *rtc)
{
const struct stm32_rtc_registers *regs = &rtc->data->regs;
@@ -547,7 +642,8 @@ static void stm32_rtc_clear_events(struct stm32_rtc *rtc,
static const struct stm32_rtc_data stm32_rtc_data = {
.has_pclk = false,
.need_dbp = true,
- .has_wakeirq = false,
+ .has_lsco = false,
+ .need_accuracy = false,
.regs = {
.tr = 0x00,
.dr = 0x04,
@@ -558,6 +654,7 @@ static const struct stm32_rtc_data stm32_rtc_data = {
.wpr = 0x24,
.sr = 0x0C, /* set to ISR offset to ease alarm management */
.scr = UNDEF_REG,
+ .cfgr = UNDEF_REG,
.verr = UNDEF_REG,
},
.events = {
@@ -569,7 +666,8 @@ static const struct stm32_rtc_data stm32_rtc_data = {
static const struct stm32_rtc_data stm32h7_rtc_data = {
.has_pclk = true,
.need_dbp = true,
- .has_wakeirq = false,
+ .has_lsco = false,
+ .need_accuracy = false,
.regs = {
.tr = 0x00,
.dr = 0x04,
@@ -580,6 +678,7 @@ static const struct stm32_rtc_data stm32h7_rtc_data = {
.wpr = 0x24,
.sr = 0x0C, /* set to ISR offset to ease alarm management */
.scr = UNDEF_REG,
+ .cfgr = UNDEF_REG,
.verr = UNDEF_REG,
},
.events = {
@@ -600,7 +699,8 @@ static void stm32mp1_rtc_clear_events(struct stm32_rtc *rtc,
static const struct stm32_rtc_data stm32mp1_data = {
.has_pclk = true,
.need_dbp = false,
- .has_wakeirq = true,
+ .has_lsco = true,
+ .need_accuracy = true,
.regs = {
.tr = 0x00,
.dr = 0x04,
@@ -611,6 +711,7 @@ static const struct stm32_rtc_data stm32mp1_data = {
.wpr = 0x24,
.sr = 0x50,
.scr = 0x5C,
+ .cfgr = 0x60,
.verr = 0x3F4,
},
.events = {
@@ -641,11 +742,20 @@ static int stm32_rtc_init(struct platform_device *pdev,
pred_a_max = STM32_RTC_PRER_PRED_A >> STM32_RTC_PRER_PRED_A_SHIFT;
pred_s_max = STM32_RTC_PRER_PRED_S >> STM32_RTC_PRER_PRED_S_SHIFT;
- for (pred_a = pred_a_max; pred_a + 1 > 0; pred_a--) {
- pred_s = (rate / (pred_a + 1)) - 1;
+ if (rtc->data->need_accuracy) {
+ for (pred_a = 0; pred_a <= pred_a_max; pred_a++) {
+ pred_s = (rate / (pred_a + 1)) - 1;
+
+ if (((pred_s + 1) * (pred_a + 1)) == rate)
+ break;
+ }
+ } else {
+ for (pred_a = pred_a_max; pred_a + 1 > 0; pred_a--) {
+ pred_s = (rate / (pred_a + 1)) - 1;
- if (((pred_s + 1) * (pred_a + 1)) == rate)
- break;
+ if (((pred_s + 1) * (pred_a + 1)) == rate)
+ break;
+ }
}
/*
@@ -738,13 +848,15 @@ static int stm32_rtc_probe(struct platform_device *pdev)
} else {
rtc->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(rtc->pclk)) {
- dev_err(&pdev->dev, "no pclk clock");
+ if (PTR_ERR(rtc->pclk) != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "no pclk clock");
return PTR_ERR(rtc->pclk);
}
rtc->rtc_ck = devm_clk_get(&pdev->dev, "rtc_ck");
}
if (IS_ERR(rtc->rtc_ck)) {
- dev_err(&pdev->dev, "no rtc_ck clock");
+ if (PTR_ERR(rtc->pclk) != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "no rtc_ck clock");
return PTR_ERR(rtc->rtc_ck);
}
@@ -781,19 +893,12 @@ static int stm32_rtc_probe(struct platform_device *pdev)
}
ret = device_init_wakeup(&pdev->dev, true);
- if (rtc->data->has_wakeirq) {
- rtc->wakeirq_alarm = platform_get_irq(pdev, 1);
- if (rtc->wakeirq_alarm > 0) {
- ret = dev_pm_set_dedicated_wake_irq(&pdev->dev,
- rtc->wakeirq_alarm);
- } else {
- ret = rtc->wakeirq_alarm;
- if (rtc->wakeirq_alarm == -EPROBE_DEFER)
- goto err;
- }
- }
if (ret)
- dev_warn(&pdev->dev, "alarm can't wake up the system: %d", ret);
+ goto err;
+
+ ret = dev_pm_set_wake_irq(&pdev->dev, rtc->irq_alarm);
+ if (ret)
+ goto err;
platform_set_drvdata(pdev, rtc);
@@ -816,6 +921,21 @@ static int stm32_rtc_probe(struct platform_device *pdev)
goto err;
}
+ if (rtc->data->has_lsco) {
+ ret = of_property_read_s32(pdev->dev.of_node,
+ "st,lsco", &rtc->lsco);
+ if (!ret) {
+ ret = stm32_rtc_clk_lsco_register(pdev);
+ if (ret)
+ dev_warn(&pdev->dev,
+ "LSCO clock registration failed: %d\n",
+ ret);
+ } else {
+ rtc->lsco = ret;
+ dev_dbg(&pdev->dev, "No LSCO clock: %d\n", ret);
+ }
+ }
+
/*
* If INITS flag is reset (calendar year field set to 0x00), calendar
* must be initialized
@@ -852,6 +972,9 @@ static int stm32_rtc_remove(struct platform_device *pdev)
const struct stm32_rtc_registers *regs = &rtc->data->regs;
unsigned int cr;
+ if (!IS_ERR_OR_NULL(rtc->clk_lsco))
+ clk_unregister_gate(rtc->clk_lsco);
+
/* Disable interrupts */
stm32_rtc_wpr_unlock(rtc);
cr = readl_relaxed(rtc->base + regs->cr);
@@ -881,9 +1004,6 @@ static int stm32_rtc_suspend(struct device *dev)
if (rtc->data->has_pclk)
clk_disable_unprepare(rtc->pclk);
- if (device_may_wakeup(dev))
- return enable_irq_wake(rtc->irq_alarm);
-
return 0;
}
@@ -902,15 +1022,13 @@ static int stm32_rtc_resume(struct device *dev)
if (ret < 0)
return ret;
- if (device_may_wakeup(dev))
- return disable_irq_wake(rtc->irq_alarm);
-
return ret;
}
#endif
-static SIMPLE_DEV_PM_OPS(stm32_rtc_pm_ops,
- stm32_rtc_suspend, stm32_rtc_resume);
+static const struct dev_pm_ops stm32_rtc_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(stm32_rtc_suspend, stm32_rtc_resume)
+};
static struct platform_driver stm32_rtc_driver = {
.probe = stm32_rtc_probe,
diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c
index 25188d6bbe152..1b71c205cee0e 100644
--- a/drivers/watchdog/stm32_iwdg.c
+++ b/drivers/watchdog/stm32_iwdg.c
@@ -163,7 +163,8 @@ static int stm32_iwdg_clk_init(struct platform_device *pdev,
wdt->clk_lsi = devm_clk_get(dev, "lsi");
if (IS_ERR(wdt->clk_lsi)) {
- dev_err(dev, "Unable to get lsi clock\n");
+ if (PTR_ERR(wdt->clk_lsi) != -EPROBE_DEFER)
+ dev_err(dev, "Unable to get lsi clock\n");
return PTR_ERR(wdt->clk_lsi);
}
@@ -171,7 +172,8 @@ static int stm32_iwdg_clk_init(struct platform_device *pdev,
if (wdt->data->has_pclk) {
wdt->clk_pclk = devm_clk_get(dev, "pclk");
if (IS_ERR(wdt->clk_pclk)) {
- dev_err(dev, "Unable to get pclk clock\n");
+ if (PTR_ERR(wdt->clk_pclk) != -EPROBE_DEFER)
+ dev_err(dev, "Unable to get pclk clock\n");
return PTR_ERR(wdt->clk_pclk);
}
diff --git a/include/dt-bindings/reset/stm32mp1-resets.h b/include/dt-bindings/reset/stm32mp1-resets.h
index f0c3aaef67a0a..f3a0ed3178356 100644
--- a/include/dt-bindings/reset/stm32mp1-resets.h
+++ b/include/dt-bindings/reset/stm32mp1-resets.h
@@ -7,6 +7,7 @@
#ifndef _DT_BINDINGS_STM32MP1_RESET_H_
#define _DT_BINDINGS_STM32MP1_RESET_H_
+#define MCU_HOLD_BOOT_R 2144
#define LTDC_R 3072
#define DSI_R 3076
#define DDRPERFM_R 3080
@@ -105,4 +106,18 @@
#define GPIOJ_R 19785
#define GPIOK_R 19786
+/* SCMI reset domain identifiers */
+#define RST_SCMI0_SPI6 0
+#define RST_SCMI0_I2C4 1
+#define RST_SCMI0_I2C6 2
+#define RST_SCMI0_USART1 3
+#define RST_SCMI0_STGEN 4
+#define RST_SCMI0_GPIOZ 5
+#define RST_SCMI0_CRYP1 6
+#define RST_SCMI0_HASH1 7
+#define RST_SCMI0_RNG1 8
+#define RST_SCMI0_MDMA 9
+#define RST_SCMI0_MCU 10
+#define RST_SCMI0_MCU_HOLD_BOOT 11
+
#endif /* _DT_BINDINGS_STM32MP1_RESET_H_ */
diff --git a/include/dt-bindings/rtc/rtc-stm32.h b/include/dt-bindings/rtc/rtc-stm32.h
new file mode 100644
index 0000000000000..4373c4dea5879
--- /dev/null
+++ b/include/dt-bindings/rtc/rtc-stm32.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides constants for STM32_RTC bindings.
+ */
+
+#ifndef _DT_BINDINGS_RTC_RTC_STM32_H
+#define _DT_BINDINGS_RTC_RTC_STM32_H
+
+#define RTC_OUT1 0
+#define RTC_OUT2 1
+#define RTC_OUT2_RMP 2
+
+#endif
--
2.17.1
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