* [PATCH 1/2] dt-bindings: rtc: stm32: introduce new st,stm32mp25-rtc compatible
2024-06-11 16:19 [PATCH 0/2] rtc: stm32: introduce new st,stm32mp25-rtc compatible Valentin Caron
@ 2024-06-11 16:19 ` Valentin Caron
2024-06-11 18:16 ` Conor Dooley
2024-06-11 16:19 ` [PATCH 2/2] rtc: stm32: add new st,stm32mp25-rtc compatible and check RIF configuration Valentin Caron
1 sibling, 1 reply; 4+ messages in thread
From: Valentin Caron @ 2024-06-11 16:19 UTC (permalink / raw)
To: Alexandre Belloni, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Alexandre Torgue
Cc: linux-rtc, devicetree, linux-stm32, linux-arm-kernel,
linux-kernel, Valentin Caron
Introduce new st,stm32mp25-rtc compatible. It is based on st,stm32mp1-rtc.
Difference is that stm32mp25 SoC implements a triple protection on RTC
registers:
- Secure bit based protection
- Privileged context based protection
- Compartment ID filtering based protection
This driver will now check theses configurations before probing to avoid
exceptions and fake reads on register.
Link: https://www.st.com/resource/en/reference_manual/rm0457-stm32mp25xx-advanced-armbased-3264bit-mpus-stmicroelectronics.pdf#page=4081
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
---
Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
index 4703083d1f11f..65a8a93ef5753 100644
--- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
@@ -15,6 +15,7 @@ properties:
- st,stm32-rtc
- st,stm32h7-rtc
- st,stm32mp1-rtc
+ - st,stm32mp25-rtc
reg:
maxItems: 1
@@ -90,7 +91,9 @@ allOf:
properties:
compatible:
contains:
- const: st,stm32mp1-rtc
+ anyOf:
+ - const: st,stm32mp1-rtc
+ - const: st,stm32mp25-rtc
then:
properties:
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 2/2] rtc: stm32: add new st,stm32mp25-rtc compatible and check RIF configuration
2024-06-11 16:19 [PATCH 0/2] rtc: stm32: introduce new st,stm32mp25-rtc compatible Valentin Caron
2024-06-11 16:19 ` [PATCH 1/2] dt-bindings: " Valentin Caron
@ 2024-06-11 16:19 ` Valentin Caron
1 sibling, 0 replies; 4+ messages in thread
From: Valentin Caron @ 2024-06-11 16:19 UTC (permalink / raw)
To: Alexandre Belloni, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Alexandre Torgue
Cc: linux-rtc, devicetree, linux-stm32, linux-arm-kernel,
linux-kernel, Valentin Caron
Introduce new st,stm32mp25-rtc compatible. It is based on st,stm32mp1-rtc.
Difference is that stm32mp25 soc implements a triple protection on RTC
registers:
- Secure bit based protection
- Privileged context based protection
- Compartment ID filtering based protection
This driver will now check theses configurations before probing to avoid
exceptions and fake reads on register.
At this time, driver needs only to check two resources: INIT and ALARM_A.
Other resources are not used.
Resource isolation framework (RIF) is a comprehensive set of hardware
blocks designed to enforce and manage isolation of STM32 hardware
resources, like memory and peripherals.
Link: https://www.st.com/resource/en/reference_manual/rm0457-stm32mp25xx-advanced-armbased-3264bit-mpus-stmicroelectronics.pdf#page=4081
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
---
drivers/rtc/rtc-stm32.c | 78 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 78 insertions(+)
diff --git a/drivers/rtc/rtc-stm32.c b/drivers/rtc/rtc-stm32.c
index 76753c71d92ee..98b07969609d2 100644
--- a/drivers/rtc/rtc-stm32.c
+++ b/drivers/rtc/rtc-stm32.c
@@ -5,6 +5,7 @@
*/
#include <linux/bcd.h>
+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/iopoll.h>
@@ -83,6 +84,18 @@
#define STM32_RTC_VERR_MAJREV_SHIFT 4
#define STM32_RTC_VERR_MAJREV GENMASK(7, 4)
+/* STM32_RTC_SECCFGR bit fields */
+#define STM32_RTC_SECCFGR 0x20
+#define STM32_RTC_SECCFGR_ALRA_SEC BIT(0)
+#define STM32_RTC_SECCFGR_INIT_SEC BIT(14)
+#define STM32_RTC_SECCFGR_SEC BIT(15)
+
+/* STM32_RTC_RXCIDCFGR bit fields */
+#define STM32_RTC_RXCIDCFGR(x) (0x80 + 0x4 * (x))
+#define STM32_RTC_RXCIDCFGR_CFEN BIT(0)
+#define STM32_RTC_RXCIDCFGR_CID GENMASK(6, 4)
+#define STM32_RTC_RXCIDCFGR_CID1 1
+
/* STM32_RTC_WPR key constants */
#define RTC_WPR_1ST_KEY 0xCA
#define RTC_WPR_2ND_KEY 0x53
@@ -120,6 +133,7 @@ struct stm32_rtc_data {
bool has_pclk;
bool need_dbp;
bool need_accuracy;
+ bool rif_protected;
};
struct stm32_rtc {
@@ -134,6 +148,14 @@ struct stm32_rtc {
int irq_alarm;
};
+struct stm32_rtc_rif_resource {
+ unsigned int num;
+ u32 bit;
+};
+
+static const struct stm32_rtc_rif_resource STM32_RTC_RES_ALRA = {0, STM32_RTC_SECCFGR_ALRA_SEC};
+static const struct stm32_rtc_rif_resource STM32_RTC_RES_INIT = {5, STM32_RTC_SECCFGR_INIT_SEC};
+
static void stm32_rtc_wpr_unlock(struct stm32_rtc *rtc)
{
const struct stm32_rtc_registers *regs = &rtc->data->regs;
@@ -553,6 +575,7 @@ static const struct stm32_rtc_data stm32_rtc_data = {
.has_pclk = false,
.need_dbp = true,
.need_accuracy = false,
+ .rif_protected = false,
.regs = {
.tr = 0x00,
.dr = 0x04,
@@ -575,6 +598,7 @@ static const struct stm32_rtc_data stm32h7_rtc_data = {
.has_pclk = true,
.need_dbp = true,
.need_accuracy = false,
+ .rif_protected = false,
.regs = {
.tr = 0x00,
.dr = 0x04,
@@ -606,6 +630,7 @@ static const struct stm32_rtc_data stm32mp1_data = {
.has_pclk = true,
.need_dbp = false,
.need_accuracy = true,
+ .rif_protected = false,
.regs = {
.tr = 0x00,
.dr = 0x04,
@@ -624,14 +649,57 @@ static const struct stm32_rtc_data stm32mp1_data = {
.clear_events = stm32mp1_rtc_clear_events,
};
+static const struct stm32_rtc_data stm32mp25_data = {
+ .has_pclk = true,
+ .need_dbp = false,
+ .need_accuracy = true,
+ .rif_protected = true,
+ .regs = {
+ .tr = 0x00,
+ .dr = 0x04,
+ .cr = 0x18,
+ .isr = 0x0C, /* named RTC_ICSR on stm32mp25 */
+ .prer = 0x10,
+ .alrmar = 0x40,
+ .wpr = 0x24,
+ .sr = 0x50,
+ .scr = 0x5C,
+ .verr = 0x3F4,
+ },
+ .events = {
+ .alra = STM32_RTC_SR_ALRA,
+ },
+ .clear_events = stm32mp1_rtc_clear_events,
+};
+
static const struct of_device_id stm32_rtc_of_match[] = {
{ .compatible = "st,stm32-rtc", .data = &stm32_rtc_data },
{ .compatible = "st,stm32h7-rtc", .data = &stm32h7_rtc_data },
{ .compatible = "st,stm32mp1-rtc", .data = &stm32mp1_data },
+ { .compatible = "st,stm32mp25-rtc", .data = &stm32mp25_data },
{}
};
MODULE_DEVICE_TABLE(of, stm32_rtc_of_match);
+static int stm32_rtc_check_rif(struct stm32_rtc *stm32_rtc,
+ struct stm32_rtc_rif_resource res)
+{
+ u32 rxcidcfgr = readl_relaxed(stm32_rtc->base + STM32_RTC_RXCIDCFGR(res.num));
+ u32 seccfgr;
+
+ /* Check if RTC available for our CID */
+ if ((rxcidcfgr & STM32_RTC_RXCIDCFGR_CFEN) &&
+ (FIELD_GET(STM32_RTC_RXCIDCFGR_CID, rxcidcfgr) != STM32_RTC_RXCIDCFGR_CID1))
+ return -EACCES;
+
+ /* Check if RTC available for non secure world */
+ seccfgr = readl_relaxed(stm32_rtc->base + STM32_RTC_SECCFGR);
+ if ((seccfgr & STM32_RTC_SECCFGR_SEC) | (seccfgr & res.bit))
+ return -EACCES;
+
+ return 0;
+}
+
static int stm32_rtc_init(struct platform_device *pdev,
struct stm32_rtc *rtc)
{
@@ -787,6 +855,16 @@ static int stm32_rtc_probe(struct platform_device *pdev)
regmap_update_bits(rtc->dbp, rtc->dbp_reg,
rtc->dbp_mask, rtc->dbp_mask);
+ if (rtc->data->rif_protected) {
+ ret = stm32_rtc_check_rif(rtc, STM32_RTC_RES_INIT);
+ if (!ret)
+ ret = stm32_rtc_check_rif(rtc, STM32_RTC_RES_ALRA);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to probe RTC due to RIF configuration\n");
+ goto err;
+ }
+ }
+
/*
* After a system reset, RTC_ISR.INITS flag can be read to check if
* the calendar has been initialized or not. INITS flag is reset by a
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread