On 12/10/2025 7:38 PM, Markus Schneider-Pargmann (TI.com) wrote:
Add dedicated helper functions to check CANUART wake registers and magic
word. This helps determining if we are in a wakeup or if CAN IO
isolation has to be removed.
Also add a helper to detect a low power mode exit/resume.
Tested-by: Anshul Dalal <[email protected]>
Signed-off-by: Markus Schneider-Pargmann (TI.com) <[email protected]>
---
arch/arm/mach-k3/common.c | 19 +++++++++++++++++++
arch/arm/mach-k3/common.h | 1 +
arch/arm/mach-k3/include/mach/hardware.h | 6 ++++++
3 files changed, 26 insertions(+)
diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index
760aaad03411441e3cc169f2501134cf69dcbee6..a80cf87ce65a44c386539ade17c0f435e09de841
100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -115,6 +115,25 @@ void mmr_unlock(uintptr_t base, u32 partition)
writel(CTRLMMR_LOCK_KICK1_UNLOCK_VAL, part_base + CTRLMMR_LOCK_KICK1);
}
+static bool wkup_ctrl_canuart_wakeup_active(void)
+{
+ return !!(readl(WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_CANUART_WAKE_STAT1)
&
+ WKUP_CTRL_MMR_CANUART_WAKE_STAT1_CANUART_IO_MODE);
+}
+
+static bool wkup_ctrl_canuart_magic_word_set(void)
+{
+ return readl(WKUP_CTRL_MMR0_BASE +
WKUP_CTRL_MMR_CANUART_WAKE_OFF_MODE_STAT) ==
+ WKUP_CTRL_MMR_CANUART_WAKE_OFF_MODE_STAT_MW;
+}
+
+bool wkup_ctrl_is_lpm_exit(void)
+{
+ return IS_ENABLED(CONFIG_K3_IODDR) &&
+ wkup_ctrl_canuart_wakeup_active() &&
+ wkup_ctrl_canuart_magic_word_set();
+}
May not be valid for all SOC, either move into some am62xx_base.c or
make it __weak, so that other SOCs can over-ride this if needed.
+
bool is_rom_loaded_sysfw(struct rom_extended_boot_data *data)
{
[..]
