stm32mp1: use a common function to check spinlock is available
To use spinlocks, MMU should be enabled, as well as data cache.
A common function is created (moved from clock file).
It is then used whenever a spinlock has to be taken, in BSEC and clock
drivers.
Change-Id: I94baed0114a2061ad71bd5287a91bf7f1c6821f6
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/plat/st/common/include/stm32mp_common.h b/plat/st/common/include/stm32mp_common.h
index 0d0a9c6..3dd6c56 100644
--- a/plat/st/common/include/stm32mp_common.h
+++ b/plat/st/common/include/stm32mp_common.h
@@ -30,6 +30,9 @@
/* Return the base address of the RCC peripheral */
uintptr_t stm32mp_rcc_base(void);
+/* Check MMU status to allow spinlock use */
+bool stm32mp_lock_available(void);
+
/* Get IWDG platform instance ID from peripheral IO memory base address */
uint32_t stm32_iwdg_get_instance(uintptr_t base);
diff --git a/plat/st/common/stm32mp_common.c b/plat/st/common/stm32mp_common.c
index f95c788..5428a74 100644
--- a/plat/st/common/stm32mp_common.c
+++ b/plat/st/common/stm32mp_common.c
@@ -87,6 +87,14 @@
return rcc_base;
}
+bool stm32mp_lock_available(void)
+{
+ const uint32_t c_m_bits = SCTLR_M_BIT | SCTLR_C_BIT;
+
+ /* The spinlocks are used only when MMU and data cache are enabled */
+ return (read_sctlr() & c_m_bits) == c_m_bits;
+}
+
uintptr_t stm32_get_gpio_bank_base(unsigned int bank)
{
if (bank == GPIO_BANK_Z) {