111 lines
2.2 KiB
ArmAsm
111 lines
2.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2014, NVIDIA
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* Copyright (C) 2015, Siemens AG
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*
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* Authors:
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* Thierry Reding <treding@nvidia.com>
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* Jan Kiszka <jan.kiszka@siemens.com>
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*/
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#include <linux/linkage.h>
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#include <asm/macro.h>
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#include <asm/psci.h>
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.pushsection ._secure.text, "ax"
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.arch_extension sec
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#define TEGRA_SB_CSR_0 0x6000c200
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#define NS_RST_VEC_WR_DIS (1 << 1)
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#define TEGRA_RESET_EXCEPTION_VECTOR 0x6000f100
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#define TEGRA_FLOW_CTRL_BASE 0x60007000
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#define FLOW_CTRL_CPU_CSR 0x08
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#define CSR_ENABLE (1 << 0)
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#define CSR_IMMEDIATE_WAKE (1 << 3)
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#define CSR_WAIT_WFI_SHIFT 8
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#define FLOW_CTRL_CPU1_CSR 0x18
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@ converts CPU ID into FLOW_CTRL_CPUn_CSR offset
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.macro get_csr_reg cpu, ofs, tmp
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cmp \cpu, #0 @ CPU0?
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lsl \tmp, \cpu, #3 @ multiple by 8 (register offset CPU1-3)
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moveq \ofs, #FLOW_CTRL_CPU_CSR
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addne \ofs, \tmp, #FLOW_CTRL_CPU1_CSR - 8
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.endm
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ENTRY(psci_arch_init)
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mov r6, lr
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mrc p15, 0, r5, c1, c1, 0 @ Read SCR
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bic r5, r5, #1 @ Secure mode
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mcr p15, 0, r5, c1, c1, 0 @ Write SCR
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isb
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@ lock reset vector for non-secure
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ldr r4, =TEGRA_SB_CSR_0
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ldr r5, [r4]
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orr r5, r5, #NS_RST_VEC_WR_DIS
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str r5, [r4]
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bl psci_get_cpu_id @ CPU ID => r0
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adr r5, _sys_clock_freq
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cmp r0, #0
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mrceq p15, 0, r7, c14, c0, 0 @ read CNTFRQ from CPU0
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streq r7, [r5]
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ldrne r7, [r5]
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mcrne p15, 0, r7, c14, c0, 0 @ write CNTFRQ to CPU1..3
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bx r6
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ENDPROC(psci_arch_init)
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_sys_clock_freq:
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.word 0
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ENTRY(psci_cpu_off)
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bl psci_cpu_off_common
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bl psci_get_cpu_id @ CPU ID => r0
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get_csr_reg r0, r2, r3
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ldr r6, =TEGRA_FLOW_CTRL_BASE
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mov r5, #(CSR_ENABLE)
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mov r4, #(1 << CSR_WAIT_WFI_SHIFT)
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add r5, r4, lsl r0
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str r5, [r6, r2]
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_loop: wfi
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b _loop
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ENDPROC(psci_cpu_off)
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ENTRY(psci_cpu_on)
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push {r4, r5, r6, lr}
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mov r4, r1
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mov r0, r1
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mov r1, r2
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mov r2, r3
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bl psci_save @ store target PC and context id
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mov r1, r4
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ldr r6, =TEGRA_RESET_EXCEPTION_VECTOR
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ldr r5, =psci_cpu_entry
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str r5, [r6]
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get_csr_reg r1, r2, r3
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ldr r6, =TEGRA_FLOW_CTRL_BASE
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mov r5, #(CSR_IMMEDIATE_WAKE | CSR_ENABLE)
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str r5, [r6, r2]
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mov r0, #ARM_PSCI_RET_SUCCESS @ Return PSCI_RET_SUCCESS
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pop {r4, r5, r6, pc}
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ENDPROC(psci_cpu_on)
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.popsection
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