| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (c) 2012, NVIDIA Corporation. All rights reserved. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| |
| #include <soc/tegra/flowctrl.h> |
| #include <soc/tegra/fuse.h> |
| |
| #include <asm/assembler.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/cache.h> |
| |
| #include "iomap.h" |
| #include "reset.h" |
| #include "sleep.h" |
| |
| #define PMC_SCRATCH41 0x140 |
| |
| #ifdef CONFIG_PM_SLEEP |
| /* |
| * tegra_resume |
| * |
| * CPU boot vector when restarting the a CPU following |
| * an LP2 transition. Also branched to by LP0 and LP1 resume after |
| * re-enabling sdram. |
| * |
| * r6: SoC ID |
| * r8: CPU part number |
| */ |
| ENTRY(tegra_resume) |
| check_cpu_part_num 0xc09, r8, r9 |
| bleq v7_invalidate_l1 |
| |
| cpu_id r0 |
| cmp r0, #0 @ CPU0? |
| THUMB( it ne ) |
| bne cpu_resume @ no |
| |
| tegra_get_soc_id TEGRA_APB_MISC_BASE, r6 |
| /* Are we on Tegra20? */ |
| cmp r6, #TEGRA20 |
| beq 1f @ Yes |
| /* Clear the flow controller flags for this CPU. */ |
| cpu_to_csr_reg r3, r0 |
| mov32 r2, TEGRA_FLOW_CTRL_BASE |
| ldr r1, [r2, r3] |
| /* Clear event & intr flag */ |
| orr r1, r1, \ |
| #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG |
| movw r0, #0x3FFD @ enable, cluster_switch, immed, bitmaps |
| @ & ext flags for CPU power mgnt |
| bic r1, r1, r0 |
| str r1, [r2, r3] |
| 1: |
| |
| mov32 r9, 0xc09 |
| cmp r8, r9 |
| bne end_ca9_scu_l2_resume |
| #ifdef CONFIG_HAVE_ARM_SCU |
| /* enable SCU */ |
| mov32 r0, TEGRA_ARM_PERIF_BASE |
| ldr r1, [r0] |
| orr r1, r1, #1 |
| str r1, [r0] |
| #endif |
| bl tegra_resume_trusted_foundations |
| |
| #ifdef CONFIG_CACHE_L2X0 |
| /* L2 cache resume & re-enable */ |
| bl l2c310_early_resume |
| #endif |
| end_ca9_scu_l2_resume: |
| mov32 r9, 0xc0f |
| cmp r8, r9 |
| bleq tegra_init_l2_for_a15 |
| |
| b cpu_resume |
| ENDPROC(tegra_resume) |
| |
| /* |
| * tegra_resume_trusted_foundations |
| * |
| * Trusted Foundations firmware initialization. |
| * |
| * Doesn't return if firmware presents. |
| * Corrupted registers: r1, r2 |
| */ |
| ENTRY(tegra_resume_trusted_foundations) |
| /* Check whether Trusted Foundations firmware presents. */ |
| mov32 r2, TEGRA_IRAM_BASE + TEGRA_IRAM_RESET_HANDLER_OFFSET |
| ldr r1, =__tegra_cpu_reset_handler_data_offset + \ |
| RESET_DATA(TF_PRESENT) |
| ldr r1, [r2, r1] |
| cmp r1, #0 |
| reteq lr |
| |
| .arch_extension sec |
| /* |
| * First call after suspend wakes firmware. No arguments required |
| * for some firmware versions. Downstream kernel of ASUS TF300T uses |
| * r0=3 for the wake-up notification. |
| */ |
| mov r0, #3 |
| smc #0 |
| |
| b cpu_resume |
| ENDPROC(tegra_resume_trusted_foundations) |
| #endif |
| |
| .align L1_CACHE_SHIFT |
| ENTRY(__tegra_cpu_reset_handler_start) |
| |
| /* |
| * __tegra_cpu_reset_handler: |
| * |
| * Common handler for all CPU reset events. |
| * |
| * Register usage within the reset handler: |
| * |
| * Others: scratch |
| * R6 = SoC ID |
| * R7 = CPU present (to the OS) mask |
| * R8 = CPU in LP1 state mask |
| * R9 = CPU in LP2 state mask |
| * R10 = CPU number |
| * R11 = CPU mask |
| * R12 = pointer to reset handler data |
| * |
| * NOTE: This code is copied to IRAM. All code and data accesses |
| * must be position-independent. |
| */ |
| |
| .arm |
| .align L1_CACHE_SHIFT |
| ENTRY(__tegra_cpu_reset_handler) |
| |
| cpsid aif, 0x13 @ SVC mode, interrupts disabled |
| |
| tegra_get_soc_id TEGRA_APB_MISC_BASE, r6 |
| |
| adr r12, __tegra_cpu_reset_handler_data |
| ldr r5, [r12, #RESET_DATA(TF_PRESENT)] |
| cmp r5, #0 |
| bne after_errata |
| |
| #ifdef CONFIG_ARCH_TEGRA_2x_SOC |
| t20_check: |
| cmp r6, #TEGRA20 |
| bne after_t20_check |
| t20_errata: |
| # Tegra20 is a Cortex-A9 r1p1 |
| mrc p15, 0, r0, c1, c0, 0 @ read system control register |
| orr r0, r0, #1 << 14 @ erratum 716044 |
| mcr p15, 0, r0, c1, c0, 0 @ write system control register |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 4 @ erratum 742230 |
| orr r0, r0, #1 << 11 @ erratum 751472 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| b after_errata |
| after_t20_check: |
| #endif |
| #ifdef CONFIG_ARCH_TEGRA_3x_SOC |
| t30_check: |
| cmp r6, #TEGRA30 |
| bne after_t30_check |
| t30_errata: |
| # Tegra30 is a Cortex-A9 r2p9 |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 6 @ erratum 743622 |
| orr r0, r0, #1 << 11 @ erratum 751472 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| b after_errata |
| after_t30_check: |
| #endif |
| after_errata: |
| mrc p15, 0, r10, c0, c0, 5 @ MPIDR |
| and r10, r10, #0x3 @ R10 = CPU number |
| mov r11, #1 |
| mov r11, r11, lsl r10 @ R11 = CPU mask |
| |
| #ifdef CONFIG_SMP |
| /* Does the OS know about this CPU? */ |
| ldr r7, [r12, #RESET_DATA(MASK_PRESENT)] |
| tst r7, r11 @ if !present |
| bleq __die @ CPU not present (to OS) |
| #endif |
| |
| /* Waking up from LP1? */ |
| ldr r8, [r12, #RESET_DATA(MASK_LP1)] |
| tst r8, r11 @ if in_lp1 |
| beq __is_not_lp1 |
| cmp r10, #0 |
| bne __die @ only CPU0 can be here |
| ldr lr, [r12, #RESET_DATA(STARTUP_LP1)] |
| cmp lr, #0 |
| bleq __die @ no LP1 startup handler |
| THUMB( add lr, lr, #1 ) @ switch to Thumb mode |
| bx lr |
| __is_not_lp1: |
| |
| /* Waking up from LP2? */ |
| ldr r9, [r12, #RESET_DATA(MASK_LP2)] |
| tst r9, r11 @ if in_lp2 |
| beq __is_not_lp2 |
| ldr lr, [r12, #RESET_DATA(STARTUP_LP2)] |
| cmp lr, #0 |
| bleq __die @ no LP2 startup handler |
| bx lr |
| |
| __is_not_lp2: |
| |
| #ifdef CONFIG_SMP |
| /* |
| * Can only be secondary boot (initial or hotplug) |
| * CPU0 can't be here for Tegra20/30 |
| */ |
| cmp r6, #TEGRA114 |
| beq __no_cpu0_chk |
| cmp r10, #0 |
| bleq __die @ CPU0 cannot be here |
| __no_cpu0_chk: |
| ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)] |
| cmp lr, #0 |
| bleq __die @ no secondary startup handler |
| bx lr |
| #endif |
| |
| /* |
| * We don't know why the CPU reset. Just kill it. |
| * The LR register will contain the address we died at + 4. |
| */ |
| |
| __die: |
| sub lr, lr, #4 |
| mov32 r7, TEGRA_PMC_BASE |
| str lr, [r7, #PMC_SCRATCH41] |
| |
| mov32 r7, TEGRA_CLK_RESET_BASE |
| |
| /* Are we on Tegra20? */ |
| cmp r6, #TEGRA20 |
| bne 1f |
| |
| #ifdef CONFIG_ARCH_TEGRA_2x_SOC |
| mov32 r0, 0x1111 |
| mov r1, r0, lsl r10 |
| str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET |
| #endif |
| 1: |
| #ifdef CONFIG_ARCH_TEGRA_3x_SOC |
| mov32 r6, TEGRA_FLOW_CTRL_BASE |
| |
| cmp r10, #0 |
| moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS |
| moveq r2, #FLOW_CTRL_CPU0_CSR |
| movne r1, r10, lsl #3 |
| addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8) |
| addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8) |
| |
| /* Clear CPU "event" and "interrupt" flags and power gate |
| it when halting but not before it is in the "WFI" state. */ |
| ldr r0, [r6, +r2] |
| orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG |
| orr r0, r0, #FLOW_CTRL_CSR_ENABLE |
| str r0, [r6, +r2] |
| |
| /* Unconditionally halt this CPU */ |
| mov r0, #FLOW_CTRL_WAITEVENT |
| str r0, [r6, +r1] |
| ldr r0, [r6, +r1] @ memory barrier |
| |
| dsb |
| isb |
| wfi @ CPU should be power gated here |
| |
| /* If the CPU didn't power gate above just kill it's clock. */ |
| |
| mov r0, r11, lsl #8 |
| str r0, [r7, #348] @ CLK_CPU_CMPLX_SET |
| #endif |
| |
| /* If the CPU still isn't dead, just spin here. */ |
| b . |
| ENDPROC(__tegra_cpu_reset_handler) |
| |
| .align L1_CACHE_SHIFT |
| .type __tegra_cpu_reset_handler_data, %object |
| .globl __tegra_cpu_reset_handler_data |
| .globl __tegra_cpu_reset_handler_data_offset |
| .equ __tegra_cpu_reset_handler_data_offset, \ |
| . - __tegra_cpu_reset_handler_start |
| __tegra_cpu_reset_handler_data: |
| .rept TEGRA_RESET_DATA_SIZE |
| .long 0 |
| .endr |
| .align L1_CACHE_SHIFT |
| |
| ENTRY(__tegra_cpu_reset_handler_end) |
