[PATCH 2/6] arch: mach-k3: common: Add support to shutdown MCU R5 Core 1
Beleswar Prasad Padhi
b-padhi at ti.com
Thu May 22 11:53:52 CEST 2025
Hi Neha,
On 22/05/25 13:21, Neha Malcom Francis wrote:
> On 22/05/25 12:48, Beleswar Padhi wrote:
>> During boot, ROM can bring up the MCU R5F cores in either lockstep or
>> split mode based on X509 certificate flags. If booted in split mode,
>> core 0 will run DM firmware and second core sits in WFI. Add support to
>> shut down core 1 so that other firmwares can later be loaded on them.
>>
>> The shutdown of MCU R5 Core 1 is invoked at A72 SPL init, as by that
>> time Device Manager (DM) is up and running on R5 Core 0. The shutdown
>> request of Core 1 is handled by Device Manager itself.
>>
>> Signed-off-by: Beleswar Padhi <b-padhi at ti.com>
>> ---
>> arch/arm/mach-k3/common.c | 55 +++++++++++++++++++++++++++
>> arch/arm/mach-k3/common.h | 1 +
>> arch/arm/mach-k3/j721e/j721e_init.c | 9 ++++-
>> arch/arm/mach-k3/j721s2/j721s2_init.c | 7 ++++
>> arch/arm/mach-k3/j784s4/j784s4_init.c | 7 ++++
>> 5 files changed, 78 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
>> index fc230f180d0..68f24948134 100644
>> --- a/arch/arm/mach-k3/common.c
>> +++ b/arch/arm/mach-k3/common.c
>> @@ -31,6 +31,10 @@
>> #include <dm/uclass-internal.h>
>> #include <dm/device-internal.h>
>>
>> +#define PROC_BOOT_CTRL_FLAG_R5_CORE_HALT 0x00000001
>> +#define PROC_ID_MCU_R5FSS0_CORE1 0x02
>> +#define PROC_BOOT_CFG_FLAG_R5_LOCKSTEP 0x00000100
>> +
>> #include <asm/arch/k3-qos.h>
>>
>> struct ti_sci_handle *get_ti_sci_handle(void)
>> @@ -328,3 +332,54 @@ void setup_qos(void)
>> writel(qos_data[i].val, (uintptr_t)qos_data[i].reg);
>> }
>> #endif
>> +
>> +int shutdown_mcu_r5_core1(void)
>> +{
> Better to build this function only if CONFIG_ARM64 is enabled?
Thanks. Perhaps we can use __maybe_unused here as the invocation of this function is CONFIG protected. Will address in revision.
Thanks for the R/Bs,
Beleswar
>
>> + struct ti_sci_handle *ti_sci = get_ti_sci_handle();
>> + struct ti_sci_dev_ops *dev_ops = &ti_sci->ops.dev_ops;
>> + struct ti_sci_proc_ops *proc_ops = &ti_sci->ops.proc_ops;
>> + u32 dev_id_mcu_r5_core1 = put_core_ids[0];
>> + u64 boot_vector;
>> + u32 cfg, ctrl, sts;
>> + int cluster_mode_lockstep, ret;
>> +
>> + ret = proc_ops->proc_request(ti_sci, PROC_ID_MCU_R5FSS0_CORE1);
>> + if (ret) {
>> + printf("Unable to request processor control for core %d\n",
>> + PROC_ID_MCU_R5FSS0_CORE1);
>> + return ret;
>> + }
>> +
>> + ret = proc_ops->get_proc_boot_status(ti_sci, PROC_ID_MCU_R5FSS0_CORE1,
>> + &boot_vector, &cfg, &ctrl, &sts);
>> + if (ret) {
>> + printf("Unable to get Processor boot status for core %d\n",
>> + PROC_ID_MCU_R5FSS0_CORE1);
>> + goto release_proc_ctrl;
>> + }
>> +
>> + /* Shutdown MCU R5F Core 1 only if the cluster is booted in SplitMode */
>> + cluster_mode_lockstep = !!(cfg & PROC_BOOT_CFG_FLAG_R5_LOCKSTEP);
>> + if (cluster_mode_lockstep) {
>> + ret = -EINVAL;
>> + goto release_proc_ctrl;
>> + }
>> +
>> + ret = proc_ops->set_proc_boot_ctrl(ti_sci, PROC_ID_MCU_R5FSS0_CORE1,
>> + PROC_BOOT_CTRL_FLAG_R5_CORE_HALT, 0);
>> + if (ret) {
>> + printf("Unable to Halt core %d\n", PROC_ID_MCU_R5FSS0_CORE1);
>> + goto release_proc_ctrl;
>> + }
>> +
>> + ret = dev_ops->put_device(ti_sci, dev_id_mcu_r5_core1);
>> + if (ret) {
>> + printf("Unable to assert reset on core %d\n",
>> + PROC_ID_MCU_R5FSS0_CORE1);
>> + return ret;
>> + }
>> +
>> +release_proc_ctrl:
>> + proc_ops->proc_release(ti_sci, PROC_ID_MCU_R5FSS0_CORE1);
>> + return ret;
>> +}
>> diff --git a/arch/arm/mach-k3/common.h b/arch/arm/mach-k3/common.h
>> index 02c74731fea..6e33f578151 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);
>> +int shutdown_mcu_r5_core1(void);
>>
>> #if (IS_ENABLED(CONFIG_K3_QOS))
>> void setup_qos(void);
>> diff --git a/arch/arm/mach-k3/j721e/j721e_init.c b/arch/arm/mach-k3/j721e/j721e_init.c
>> index f31c20f7ed6..edca2634fb9 100644
>> --- a/arch/arm/mach-k3/j721e/j721e_init.c
>> +++ b/arch/arm/mach-k3/j721e/j721e_init.c
>> @@ -296,9 +296,9 @@ void do_dt_magic(void)
>>
>> void board_init_f(ulong dummy)
>> {
>> + int ret;
>> #if defined(CONFIG_K3_J721E_DDRSS) || defined(CONFIG_K3_LOAD_SYSFW)
>> struct udevice *dev;
>> - int ret;
>> #endif
>> /*
>> * Cannot delay this further as there is a chance that
>> @@ -371,6 +371,13 @@ void board_init_f(ulong dummy)
>> preloader_console_init();
>> #endif
>>
>> + /* Shutdown MCU_R5 Core 1 in Split mode at A72 SPL Stage */
>> + if (IS_ENABLED(CONFIG_ARM64)) {
>> + ret = shutdown_mcu_r5_core1();
>> + if (ret)
>> + printf("Unable to shutdown MCU R5 core 1, %d\n", ret);
>> + }
>> +
>> /* Output System Firmware version info */
>> k3_sysfw_print_ver();
>>
>> diff --git a/arch/arm/mach-k3/j721s2/j721s2_init.c b/arch/arm/mach-k3/j721s2/j721s2_init.c
>> index 5941fa26a95..6342161f830 100644
>> --- a/arch/arm/mach-k3/j721s2/j721s2_init.c
>> +++ b/arch/arm/mach-k3/j721s2/j721s2_init.c
>> @@ -230,6 +230,13 @@ void k3_spl_init(void)
>> remove_fwl_configs(navss_cbass0_fwls, ARRAY_SIZE(navss_cbass0_fwls));
>> }
>>
>> + /* Shutdown MCU_R5 Core 1 in Split mode at A72 SPL Stage */
>> + if (IS_ENABLED(CONFIG_ARM64)) {
>> + ret = shutdown_mcu_r5_core1();
>> + if (ret)
>> + printf("Unable to shutdown MCU R5 core 1, %d\n", ret);
>> + }
>> +
>> /* Output System Firmware version info */
>> k3_sysfw_print_ver();
>> }
>> diff --git a/arch/arm/mach-k3/j784s4/j784s4_init.c b/arch/arm/mach-k3/j784s4/j784s4_init.c
>> index 787cf6261e4..2756accbe12 100644
>> --- a/arch/arm/mach-k3/j784s4/j784s4_init.c
>> +++ b/arch/arm/mach-k3/j784s4/j784s4_init.c
>> @@ -206,6 +206,13 @@ void k3_spl_init(void)
>>
>> writel(AUDIO_REFCLK1_DEFAULT, (uintptr_t)CTRL_MMR_CFG0_AUDIO_REFCLK1_CTRL);
>>
>> + /* Shutdown MCU_R5 Core 1 in Split mode at A72 SPL Stage */
>> + if (IS_ENABLED(CONFIG_ARM64)) {
>> + ret = shutdown_mcu_r5_core1();
>> + if (ret)
>> + printf("Unable to shutdown MCU R5 core 1, %d\n", ret);
>> + }
>> +
>> /* Output System Firmware version info */
>> k3_sysfw_print_ver();
>> }
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