[PATCH v2 01/22] arm: mach-k3: Remove CANUART IO isolation
Markus Schneider-Pargmann
msp at baylibre.com
Fri Jun 13 15:19:21 CEST 2025
After leaving the Partial-IO mode or other deep sleep states, the IO
isolation needs to be removed. This routine is shared by at least am62,
am62a and am62p.
The original function for testing was developed by
Akashdeep Kaur <a-kaur at ti.com>
Signed-off-by: Markus Schneider-Pargmann <msp at baylibre.com>
---
arch/arm/mach-k3/am62ax/am62a7_init.c | 2 ++
arch/arm/mach-k3/am62px/am62p5_init.c | 2 ++
arch/arm/mach-k3/am62x/am625_init.c | 2 ++
arch/arm/mach-k3/common.c | 56 ++++++++++++++++++++++++++++++++
arch/arm/mach-k3/common.h | 1 +
arch/arm/mach-k3/include/mach/hardware.h | 29 +++++++++++++++++
6 files changed, 92 insertions(+)
diff --git a/arch/arm/mach-k3/am62ax/am62a7_init.c b/arch/arm/mach-k3/am62ax/am62a7_init.c
index edd43a1d78daa600969f468cf3fbdbd0bc6892a0..d50de75ff669938c0803c0622d040fc1e5d0cf4c 100644
--- a/arch/arm/mach-k3/am62ax/am62a7_init.c
+++ b/arch/arm/mach-k3/am62ax/am62a7_init.c
@@ -102,6 +102,8 @@ void board_init_f(ulong dummy)
/* Init DM early */
spl_early_init();
+ wkup_ctrl_remove_can_io_isolation_if_set();
+
/*
* Process pinctrl for the serial0 and serial3, aka WKUP_UART0 and
* MAIN_UART1 modules and continue regardless of the result of pinctrl.
diff --git a/arch/arm/mach-k3/am62px/am62p5_init.c b/arch/arm/mach-k3/am62px/am62p5_init.c
index 6e3c66e5107a2674ba8781272df8cf5f05338986..357012b3e52b4a381fb8592c7afb624d01583776 100644
--- a/arch/arm/mach-k3/am62px/am62p5_init.c
+++ b/arch/arm/mach-k3/am62px/am62p5_init.c
@@ -160,6 +160,8 @@ void board_init_f(ulong dummy)
if (ret)
panic("spl_early_init() failed: %d\n", ret);
+ wkup_ctrl_remove_can_io_isolation_if_set();
+
/*
* Process pinctrl for the serial0 and serial3, aka WKUP_UART0 and
* MAIN_UART1 modules and continue regardless of the result of pinctrl.
diff --git a/arch/arm/mach-k3/am62x/am625_init.c b/arch/arm/mach-k3/am62x/am625_init.c
index a422919fab131a099b1f7786f2a84ca0a413dd38..9a5eb6e47249e18f7f4e3ded62d936490f2fec6d 100644
--- a/arch/arm/mach-k3/am62x/am625_init.c
+++ b/arch/arm/mach-k3/am62x/am625_init.c
@@ -201,6 +201,8 @@ void board_init_f(ulong dummy)
/* Init DM early */
spl_early_init();
+ wkup_ctrl_remove_can_io_isolation_if_set();
+
/*
* Process pinctrl for the serial0 and serial3, aka WKUP_UART0 and
* MAIN_UART1 modules and continue regardless of the result of pinctrl.
diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index 0323001d6d3746801b2c379a849c7b2e0d5b977a..517065bd3a18a5d28270e9cf2f552afa8acb1ed6 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -30,6 +30,9 @@
#include <soc.h>
#include <dm/uclass-internal.h>
#include <dm/device-internal.h>
+#include <wait_bit.h>
+
+#define CLKSTOP_TRANSITION_TIMEOUT_MS 10
#include <asm/arch/k3-qos.h>
@@ -78,6 +81,59 @@ void mmr_unlock(uintptr_t base, u32 partition)
writel(CTRLMMR_LOCK_KICK1_UNLOCK_VAL, part_base + CTRLMMR_LOCK_KICK1);
}
+static void wkup_ctrl_remove_can_io_isolation(void)
+{
+ const void *wait_reg = (const void *)(WKUP_CTRL_MMR0_BASE +
+ WKUP_CTRL_MMR_CANUART_WAKE_STAT1);
+ int ret;
+ u32 reg = 0;
+
+ /* Program magic word */
+ reg = readl(WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_CANUART_WAKE_CTRL);
+ reg |= WKUP_CTRL_MMR_CANUART_WAKE_CTRL_MW << WKUP_CTRL_MMR_CANUART_WAKE_CTRL_MW_SHIFT;
+ writel(reg, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_CANUART_WAKE_CTRL);
+
+ /* Set enable bit. */
+ reg |= WKUP_CTRL_MMR_CANUART_WAKE_CTRL_MW_LOAD_EN;
+ writel(reg, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_CANUART_WAKE_CTRL);
+
+ /* Clear enable bit. */
+ reg &= ~WKUP_CTRL_MMR_CANUART_WAKE_CTRL_MW_LOAD_EN;
+ writel(reg, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_CANUART_WAKE_CTRL);
+
+ /* wait for CAN_ONLY_IO signal to be 0 */
+ ret = wait_for_bit_32(wait_reg,
+ WKUP_CTRL_MMR_CANUART_WAKE_STAT1_CANUART_IO_MODE,
+ false,
+ CLKSTOP_TRANSITION_TIMEOUT_MS,
+ false);
+ if (ret < 0)
+ return;
+
+ /* Reset magic word */
+ writel(0, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_CANUART_WAKE_CTRL);
+
+ /* Remove WKUP IO isolation */
+ reg = readl(WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_PMCTRL_IO_0);
+ reg = reg & WKUP_CTRL_MMR_PMCTRL_IO_0_WRITE_MASK & ~WKUP_CTRL_MMR_PMCTRL_IO_0_GLOBAL_WUEN_0;
+ writel(reg, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_PMCTRL_IO_0);
+
+ /* clear global IO isolation */
+ reg = readl(WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_PMCTRL_IO_0);
+ reg = reg & WKUP_CTRL_MMR_PMCTRL_IO_0_WRITE_MASK & ~WKUP_CTRL_MMR_PMCTRL_IO_0_IO_ISO_CTRL_0;
+ writel(reg, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_PMCTRL_IO_0);
+
+ writel(0, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_DEEPSLEEP_CTRL);
+ writel(0, WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_PMCTRL_IO_GLB);
+}
+
+void wkup_ctrl_remove_can_io_isolation_if_set(void)
+{
+ if (readl(WKUP_CTRL_MMR0_BASE + WKUP_CTRL_MMR_CANUART_WAKE_STAT1) &
+ WKUP_CTRL_MMR_CANUART_WAKE_STAT1_CANUART_IO_MODE)
+ wkup_ctrl_remove_can_io_isolation();
+}
+
bool is_rom_loaded_sysfw(struct rom_extended_boot_data *data)
{
if (strncmp(data->header, K3_ROM_BOOT_HEADER_MAGIC, 7))
diff --git a/arch/arm/mach-k3/common.h b/arch/arm/mach-k3/common.h
index 02c74731feab84bd0b14375c30538bb7963e8d51..390a6fd41f6a30c9e7837342deb000d308fd802d 100644
--- a/arch/arm/mach-k3/common.h
+++ b/arch/arm/mach-k3/common.h
@@ -49,6 +49,7 @@ enum k3_device_type get_device_type(void);
struct ti_sci_handle *get_ti_sci_handle(void);
void do_board_detect(void);
void ti_secure_image_check_binary(void **p_image, size_t *p_size);
+void wkup_ctrl_remove_can_io_isolation_if_set(void);
#if (IS_ENABLED(CONFIG_K3_QOS))
void setup_qos(void);
diff --git a/arch/arm/mach-k3/include/mach/hardware.h b/arch/arm/mach-k3/include/mach/hardware.h
index 81b5f1fa45ea30456a43c6640aad01388ea6a3f2..d7c759420524faf48ea26c66607c6a899d1321b3 100644
--- a/arch/arm/mach-k3/include/mach/hardware.h
+++ b/arch/arm/mach-k3/include/mach/hardware.h
@@ -117,6 +117,35 @@ K3_SOC_ID(j722s, J722S)
#define CTRLMMR_LOCK_KICK1 0x100c
#define CTRLMMR_LOCK_KICK1_UNLOCK_VAL 0xd172bc5a
+/*
+ * Shared WKUP_CTRL_MMR0 definitions used to remove IO isolation
+ */
+#define WKUP_CTRL_MMR_CANUART_WAKE_CTRL 0x18300
+#define WKUP_CTRL_MMR_CANUART_WAKE_CTRL_MW 0x2aaaaaaa
+#define WKUP_CTRL_MMR_CANUART_WAKE_CTRL_MW_SHIFT 1
+#define WKUP_CTRL_MMR_CANUART_WAKE_CTRL_MW_LOAD_EN BIT(0)
+
+#define WKUP_CTRL_MMR_CANUART_WAKE_STAT1 0x1830c
+#define WKUP_CTRL_MMR_CANUART_WAKE_STAT1_CANUART_IO_MODE BIT(0)
+
+#define WKUP_CTRL_MMR_PMCTRL_IO_0 0x18084
+#define WKUP_CTRL_MMR_PMCTRL_IO_0_ISOCLK_OVRD_0 BIT(0)
+#define WKUP_CTRL_MMR_PMCTRL_IO_0_ISOOVR_EXTEND_0 BIT(4)
+#define WKUP_CTRL_MMR_PMCTRL_IO_0_ISO_BYPASS_OVR_0 BIT(6)
+#define WKUP_CTRL_MMR_PMCTRL_IO_0_WUCLK_CTRL_0 BIT(8)
+#define WKUP_CTRL_MMR_PMCTRL_IO_0_GLOBAL_WUEN_0 BIT(16)
+#define WKUP_CTRL_MMR_PMCTRL_IO_0_IO_ISO_CTRL_0 BIT(24)
+#define WKUP_CTRL_MMR_PMCTRL_IO_0_WRITE_MASK ( \
+ WKUP_CTRL_MMR_PMCTRL_IO_0_ISOCLK_OVRD_0 | \
+ WKUP_CTRL_MMR_PMCTRL_IO_0_ISOOVR_EXTEND_0 | \
+ WKUP_CTRL_MMR_PMCTRL_IO_0_ISO_BYPASS_OVR_0 | \
+ WKUP_CTRL_MMR_PMCTRL_IO_0_WUCLK_CTRL_0 | \
+ WKUP_CTRL_MMR_PMCTRL_IO_0_GLOBAL_WUEN_0 | \
+ WKUP_CTRL_MMR_PMCTRL_IO_0_IO_ISO_CTRL_0)
+
+#define WKUP_CTRL_MMR_PMCTRL_IO_GLB 0x1809c
+#define WKUP_CTRL_MMR_DEEPSLEEP_CTRL 0x18160
+
#define K3_ROM_BOOT_HEADER_MAGIC "EXTBOOT"
struct rom_extended_boot_data {
--
2.49.0
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