| Jan Kiszka | 52bb8f9 | 2015-04-21 07:18:35 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2014, NVIDIA |
| 3 | * Copyright (C) 2015, Siemens AG |
| 4 | * |
| 5 | * Authors: |
| 6 | * Thierry Reding <treding@nvidia.com> |
| 7 | * Jan Kiszka <jan.kiszka@siemens.com> |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0+ |
| 10 | */ |
| 11 | |
| 12 | #include <linux/linkage.h> |
| 13 | #include <asm/macro.h> |
| 14 | #include <asm/psci.h> |
| 15 | |
| 16 | .pushsection ._secure.text, "ax" |
| 17 | .arch_extension sec |
| 18 | |
| 19 | #define TEGRA_SB_CSR_0 0x6000c200 |
| 20 | #define NS_RST_VEC_WR_DIS (1 << 1) |
| 21 | |
| 22 | #define TEGRA_RESET_EXCEPTION_VECTOR 0x6000f100 |
| 23 | |
| 24 | #define TEGRA_FLOW_CTRL_BASE 0x60007000 |
| 25 | #define FLOW_CTRL_CPU_CSR 0x08 |
| 26 | #define CSR_ENABLE (1 << 0) |
| 27 | #define CSR_IMMEDIATE_WAKE (1 << 3) |
| 28 | #define CSR_WAIT_WFI_SHIFT 8 |
| 29 | #define FLOW_CTRL_CPU1_CSR 0x18 |
| 30 | |
| 31 | @ converts CPU ID into FLOW_CTRL_CPUn_CSR offset |
| 32 | .macro get_csr_reg cpu, ofs, tmp |
| 33 | cmp \cpu, #0 @ CPU0? |
| 34 | lsl \tmp, \cpu, #3 @ multiple by 8 (register offset CPU1-3) |
| 35 | moveq \ofs, #FLOW_CTRL_CPU_CSR |
| 36 | addne \ofs, \tmp, #FLOW_CTRL_CPU1_CSR - 8 |
| 37 | .endm |
| 38 | |
| 39 | ENTRY(psci_arch_init) |
| 40 | mov r6, lr |
| 41 | |
| 42 | mrc p15, 0, r5, c1, c1, 0 @ Read SCR |
| 43 | bic r5, r5, #1 @ Secure mode |
| 44 | mcr p15, 0, r5, c1, c1, 0 @ Write SCR |
| 45 | isb |
| 46 | |
| 47 | @ lock reset vector for non-secure |
| 48 | ldr r4, =TEGRA_SB_CSR_0 |
| 49 | ldr r5, [r4] |
| 50 | orr r5, r5, #NS_RST_VEC_WR_DIS |
| 51 | str r5, [r4] |
| 52 | |
| 53 | bl psci_get_cpu_id @ CPU ID => r0 |
| 54 | bl psci_get_cpu_stack_top @ stack top => r0 |
| 55 | mov sp, r0 |
| 56 | |
| 57 | bx r6 |
| 58 | ENDPROC(psci_arch_init) |
| 59 | |
| 60 | ENTRY(psci_cpu_off) |
| 61 | bl psci_cpu_off_common |
| 62 | |
| 63 | bl psci_get_cpu_id @ CPU ID => r0 |
| 64 | |
| 65 | get_csr_reg r0, r2, r3 |
| 66 | |
| 67 | ldr r6, =TEGRA_FLOW_CTRL_BASE |
| 68 | mov r5, #(CSR_ENABLE) |
| 69 | mov r4, #(1 << CSR_WAIT_WFI_SHIFT) |
| 70 | add r5, r4, lsl r0 |
| 71 | str r5, [r6, r2] |
| 72 | |
| 73 | _loop: wfi |
| 74 | b _loop |
| 75 | ENDPROC(psci_cpu_off) |
| 76 | |
| 77 | ENTRY(psci_cpu_on) |
| 78 | push {lr} |
| 79 | |
| 80 | mov r0, r1 |
| 81 | bl psci_get_cpu_stack_top @ get stack top of target CPU |
| 82 | str r2, [r0] @ store target PC at stack top |
| 83 | dsb |
| 84 | |
| 85 | ldr r6, =TEGRA_RESET_EXCEPTION_VECTOR |
| 86 | ldr r5, =psci_cpu_entry |
| 87 | str r5, [r6] |
| 88 | |
| 89 | get_csr_reg r1, r2, r3 |
| 90 | |
| 91 | ldr r6, =TEGRA_FLOW_CTRL_BASE |
| 92 | mov r5, #(CSR_IMMEDIATE_WAKE | CSR_ENABLE) |
| 93 | str r5, [r6, r2] |
| 94 | |
| 95 | mov r0, #ARM_PSCI_RET_SUCCESS @ Return PSCI_RET_SUCCESS |
| 96 | pop {pc} |
| 97 | ENDPROC(psci_cpu_on) |
| 98 | |
| 99 | .globl psci_text_end |
| 100 | psci_text_end: |
| 101 | .popsection |