diff options
| -rw-r--r-- | plat/arm/board/a5ds/aarch32/a5ds_helpers.S | 82 | ||||
| -rw-r--r-- | plat/arm/board/a5ds/include/platform_def.h | 8 |
2 files changed, 83 insertions, 7 deletions
diff --git a/plat/arm/board/a5ds/aarch32/a5ds_helpers.S b/plat/arm/board/a5ds/aarch32/a5ds_helpers.S index 23a22d9c5..ed7ad9c86 100644 --- a/plat/arm/board/a5ds/aarch32/a5ds_helpers.S +++ b/plat/arm/board/a5ds/aarch32/a5ds_helpers.S @@ -12,17 +12,36 @@ .globl plat_get_my_entrypoint .globl plat_is_my_cpu_primary - /* -------------------------------------------------------------------- + /* ----------------------------------------------------- * void plat_secondary_cold_boot_setup (void); * - * For AArch32, cold-booting secondary CPUs is not yet - * implemented and they panic. - * -------------------------------------------------------------------- + * This function performs any platform specific actions + * needed for a secondary cpu after a cold reset e.g + * mark the cpu's presence, mechanism to place it in a + * holding pen etc. + * ----------------------------------------------------- */ func plat_secondary_cold_boot_setup -cb_panic: - wfi - b cb_panic + /* Calculate address of our hold entry */ + bl plat_my_core_pos + lsl r0, r0, #A5DS_HOLD_ENTRY_SHIFT + mov_imm r2, A5DS_HOLD_BASE + /* Clear the value stored in the hold address for the specific core */ + mov_imm r3, A5DS_HOLD_STATE_WAIT + str r3, [r2, r0] + dmb ish + + /* Wait until we have a go */ +poll_mailbox: + ldr r1, [r2, r0] + cmp r1, #A5DS_HOLD_STATE_WAIT + beq 1f + mov_imm r0, A5DS_TRUSTED_MAILBOX_BASE + ldr r1, [r0] + bx r1 +1: + wfe + b poll_mailbox endfunc plat_secondary_cold_boot_setup /* --------------------------------------------------------------------- @@ -56,3 +75,52 @@ func plat_is_my_cpu_primary movne r0, #0 bx lr endfunc plat_is_my_cpu_primary + + /* --------------------------------------------------------------------- + * Loads MPIDR in r0 and calls plat_arm_calc_core_pos + * --------------------------------------------------------------------- + */ +func plat_my_core_pos + ldcopr r0, MPIDR + b plat_arm_calc_core_pos + +endfunc plat_my_core_pos + + /* --------------------------------------------------------------------- + * unsigned int plat_arm_calc_core_pos(u_register_t mpidr) + * + * Function to calculate the core position on A5DS. + * + * (ClusterId * A5DS_MAX_CPUS_PER_CLUSTER * A5DS_MAX_PE_PER_CPU) + + * (CPUId * A5DS_MAX_PE_PER_CPU) + + * ThreadId + * + * which can be simplified as: + * + * ((ClusterId * A5DS_MAX_CPUS_PER_CLUSTER + CPUId) * A5DS_MAX_PE_PER_CPU) + * + ThreadId + * --------------------------------------------------------------------- + */ +func plat_arm_calc_core_pos + mov r3, r0 + + /* + * Check for MT bit in MPIDR. If not set, shift MPIDR to left to make it + * look as if in a multi-threaded implementation + */ + tst r0, #MPIDR_MT_MASK + lsleq r3, r0, #MPIDR_AFFINITY_BITS + + /* Extract individual affinity fields from MPIDR */ + ubfx r0, r3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS + ubfx r1, r3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS + ubfx r2, r3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS + + /* Compute linear position */ + mov r3, #A5DS_MAX_CPUS_PER_CLUSTER + mla r1, r2, r3, r1 + mov r3, #A5DS_MAX_PE_PER_CPU + mla r0, r1, r3, r0 + + bx lr +endfunc plat_arm_calc_core_pos diff --git a/plat/arm/board/a5ds/include/platform_def.h b/plat/arm/board/a5ds/include/platform_def.h index db65c3778..13c19343f 100644 --- a/plat/arm/board/a5ds/include/platform_def.h +++ b/plat/arm/board/a5ds/include/platform_def.h @@ -325,6 +325,14 @@ /* Mailbox base address */ #define A5DS_TRUSTED_MAILBOX_BASE A5DS_SHARED_RAM_BASE +#define A5DS_TRUSTED_MAILBOX_SIZE (8 + A5DS_HOLD_SIZE) +#define A5DS_HOLD_BASE (A5DS_TRUSTED_MAILBOX_BASE + 8) +#define A5DS_HOLD_SIZE (PLATFORM_CORE_COUNT * \ + A5DS_HOLD_ENTRY_SIZE) +#define A5DS_HOLD_ENTRY_SHIFT 3 +#define A5DS_HOLD_ENTRY_SIZE (1 << A5DS_HOLD_ENTRY_SHIFT) +#define A5DS_HOLD_STATE_WAIT 0 +#define A5DS_HOLD_STATE_GO 1 /* * GIC related constants to cater for GICv2 |