576 lines
14 KiB
ArmAsm
576 lines
14 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
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* Copyright (c) 2011, Google, Inc.
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*
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* Author: Colin Cross <ccross@android.com>
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* Gary King <gking@nvidia.com>
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*/
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#include <linux/linkage.h>
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#include <soc/tegra/flowctrl.h>
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#include <asm/assembler.h>
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#include <asm/proc-fns.h>
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#include <asm/cp15.h>
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#include <asm/cache.h>
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#include "irammap.h"
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#include "reset.h"
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#include "sleep.h"
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#define EMC_CFG 0xc
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#define EMC_ADR_CFG 0x10
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#define EMC_NOP 0xdc
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#define EMC_SELF_REF 0xe0
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#define EMC_REQ_CTRL 0x2b0
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#define EMC_EMC_STATUS 0x2b4
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#define CLK_RESET_CCLK_BURST 0x20
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#define CLK_RESET_CCLK_DIVIDER 0x24
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#define CLK_RESET_SCLK_BURST 0x28
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#define CLK_RESET_SCLK_DIVIDER 0x2c
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#define CLK_RESET_PLLC_BASE 0x80
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#define CLK_RESET_PLLM_BASE 0x90
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#define CLK_RESET_PLLP_BASE 0xa0
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#define APB_MISC_XM2CFGCPADCTRL 0x8c8
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#define APB_MISC_XM2CFGDPADCTRL 0x8cc
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#define APB_MISC_XM2CLKCFGPADCTRL 0x8d0
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#define APB_MISC_XM2COMPPADCTRL 0x8d4
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#define APB_MISC_XM2VTTGENPADCTRL 0x8d8
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#define APB_MISC_XM2CFGCPADCTRL2 0x8e4
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#define APB_MISC_XM2CFGDPADCTRL2 0x8e8
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#define __tegra20_cpu1_resettable_status_offset \
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(__tegra_cpu_reset_handler_data_offset + RESET_DATA(RESETTABLE_STATUS))
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.macro pll_enable, rd, r_car_base, pll_base
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ldr \rd, [\r_car_base, #\pll_base]
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tst \rd, #(1 << 30)
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orreq \rd, \rd, #(1 << 30)
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streq \rd, [\r_car_base, #\pll_base]
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.endm
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.macro emc_device_mask, rd, base
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ldr \rd, [\base, #EMC_ADR_CFG]
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tst \rd, #(0x3 << 24)
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moveq \rd, #(0x1 << 8) @ just 1 device
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movne \rd, #(0x3 << 8) @ 2 devices
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.endm
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#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
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/*
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* tegra20_hotplug_shutdown(void)
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*
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* puts the current cpu in reset
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* should never return
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*/
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ENTRY(tegra20_hotplug_shutdown)
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/* Put this CPU down */
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cpu_id r0
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bl tegra20_cpu_shutdown
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ret lr @ should never get here
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ENDPROC(tegra20_hotplug_shutdown)
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/*
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* tegra20_cpu_shutdown(int cpu)
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*
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* r0 is cpu to reset
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*
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* puts the specified CPU in wait-for-event mode on the flow controller
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* and puts the CPU in reset
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* can be called on the current cpu or another cpu
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* if called on the current cpu, does not return
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* MUST NOT BE CALLED FOR CPU 0.
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*
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* corrupts r0-r3, r12
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*/
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ENTRY(tegra20_cpu_shutdown)
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cmp r0, #0
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reteq lr @ must not be called for CPU 0
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mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
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ldr r2, =__tegra20_cpu1_resettable_status_offset
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mov r12, #CPU_RESETTABLE
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strb r12, [r1, r2]
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cpu_to_halt_reg r1, r0
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ldr r3, =TEGRA_FLOW_CTRL_VIRT
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mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
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str r2, [r3, r1] @ put flow controller in wait event mode
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ldr r2, [r3, r1]
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isb
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dsb
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movw r1, 0x1011
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mov r1, r1, lsl r0
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ldr r3, =TEGRA_CLK_RESET_VIRT
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str r1, [r3, #0x340] @ put slave CPU in reset
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isb
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dsb
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cpu_id r3
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cmp r3, r0
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beq .
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ret lr
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ENDPROC(tegra20_cpu_shutdown)
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#endif
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#ifdef CONFIG_PM_SLEEP
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/*
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* tegra_pen_lock
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*
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* spinlock implementation with no atomic test-and-set and no coherence
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* using Peterson's algorithm on strongly-ordered registers
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* used to synchronize a cpu waking up from wfi with entering lp2 on idle
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*
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* The reference link of Peterson's algorithm:
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* http://en.wikipedia.org/wiki/Peterson's_algorithm
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*
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* SCRATCH37 = r1 = !turn (inverted from Peterson's algorithm)
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* on cpu 0:
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* r2 = flag[0] (in SCRATCH38)
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* r3 = flag[1] (in SCRATCH39)
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* on cpu1:
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* r2 = flag[1] (in SCRATCH39)
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* r3 = flag[0] (in SCRATCH38)
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*
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* must be called with MMU on
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* corrupts r0-r3, r12
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*/
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ENTRY(tegra_pen_lock)
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mov32 r3, TEGRA_PMC_VIRT
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cpu_id r0
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add r1, r3, #PMC_SCRATCH37
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cmp r0, #0
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addeq r2, r3, #PMC_SCRATCH38
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addeq r3, r3, #PMC_SCRATCH39
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addne r2, r3, #PMC_SCRATCH39
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addne r3, r3, #PMC_SCRATCH38
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mov r12, #1
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str r12, [r2] @ flag[cpu] = 1
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dsb
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str r12, [r1] @ !turn = cpu
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1: dsb
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ldr r12, [r3]
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cmp r12, #1 @ flag[!cpu] == 1?
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ldreq r12, [r1]
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cmpeq r12, r0 @ !turn == cpu?
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beq 1b @ while !turn == cpu && flag[!cpu] == 1
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ret lr @ locked
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ENDPROC(tegra_pen_lock)
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ENTRY(tegra_pen_unlock)
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dsb
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mov32 r3, TEGRA_PMC_VIRT
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cpu_id r0
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cmp r0, #0
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addeq r2, r3, #PMC_SCRATCH38
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addne r2, r3, #PMC_SCRATCH39
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mov r12, #0
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str r12, [r2]
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ret lr
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ENDPROC(tegra_pen_unlock)
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/*
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* tegra20_cpu_clear_resettable(void)
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*
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* Called to clear the "resettable soon" flag in IRAM variable when
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* it is expected that the secondary CPU will be idle soon.
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*/
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ENTRY(tegra20_cpu_clear_resettable)
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mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
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ldr r2, =__tegra20_cpu1_resettable_status_offset
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mov r12, #CPU_NOT_RESETTABLE
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strb r12, [r1, r2]
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ret lr
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ENDPROC(tegra20_cpu_clear_resettable)
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/*
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* tegra20_cpu_set_resettable_soon(void)
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*
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* Called to set the "resettable soon" flag in IRAM variable when
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* it is expected that the secondary CPU will be idle soon.
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*/
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ENTRY(tegra20_cpu_set_resettable_soon)
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mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
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ldr r2, =__tegra20_cpu1_resettable_status_offset
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mov r12, #CPU_RESETTABLE_SOON
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strb r12, [r1, r2]
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ret lr
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ENDPROC(tegra20_cpu_set_resettable_soon)
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/*
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* tegra20_cpu_is_resettable_soon(void)
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*
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* Returns true if the "resettable soon" flag in IRAM variable has been
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* set because it is expected that the secondary CPU will be idle soon.
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*/
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ENTRY(tegra20_cpu_is_resettable_soon)
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mov32 r1, TEGRA_IRAM_RESET_BASE_VIRT
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ldr r2, =__tegra20_cpu1_resettable_status_offset
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ldrb r12, [r1, r2]
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cmp r12, #CPU_RESETTABLE_SOON
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moveq r0, #1
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movne r0, #0
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ret lr
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ENDPROC(tegra20_cpu_is_resettable_soon)
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/*
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* tegra20_sleep_core_finish(unsigned long v2p)
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*
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* Enters suspend in LP0 or LP1 by turning off the mmu and jumping to
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* tegra20_tear_down_core in IRAM
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*/
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ENTRY(tegra20_sleep_core_finish)
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mov r4, r0
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/* Flush, disable the L1 data cache and exit SMP */
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mov r0, #TEGRA_FLUSH_CACHE_ALL
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bl tegra_disable_clean_inv_dcache
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mov r0, r4
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mov32 r3, tegra_shut_off_mmu
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add r3, r3, r0
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mov32 r0, tegra20_tear_down_core
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mov32 r1, tegra20_iram_start
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sub r0, r0, r1
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mov32 r1, TEGRA_IRAM_LPx_RESUME_AREA
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add r0, r0, r1
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ret r3
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ENDPROC(tegra20_sleep_core_finish)
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/*
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* tegra20_sleep_cpu_secondary_finish(unsigned long v2p)
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*
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* Enters WFI on secondary CPU by exiting coherency.
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*/
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ENTRY(tegra20_sleep_cpu_secondary_finish)
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stmfd sp!, {r4-r11, lr}
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mrc p15, 0, r11, c1, c0, 1 @ save actlr before exiting coherency
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/* Flush and disable the L1 data cache */
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mov r0, #TEGRA_FLUSH_CACHE_LOUIS
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bl tegra_disable_clean_inv_dcache
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mov32 r0, TEGRA_IRAM_RESET_BASE_VIRT
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ldr r4, =__tegra20_cpu1_resettable_status_offset
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mov r3, #CPU_RESETTABLE
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strb r3, [r0, r4]
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bl tegra_cpu_do_idle
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/*
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* cpu may be reset while in wfi, which will return through
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* tegra_resume to cpu_resume
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* or interrupt may wake wfi, which will return here
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* cpu state is unchanged - MMU is on, cache is on, coherency
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* is off, and the data cache is off
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*
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* r11 contains the original actlr
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*/
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bl tegra_pen_lock
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mov32 r0, TEGRA_IRAM_RESET_BASE_VIRT
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ldr r4, =__tegra20_cpu1_resettable_status_offset
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mov r3, #CPU_NOT_RESETTABLE
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strb r3, [r0, r4]
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bl tegra_pen_unlock
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/* Re-enable the data cache */
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mrc p15, 0, r10, c1, c0, 0
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orr r10, r10, #CR_C
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mcr p15, 0, r10, c1, c0, 0
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isb
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mcr p15, 0, r11, c1, c0, 1 @ reenable coherency
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/* Invalidate the TLBs & BTAC */
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mov r1, #0
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mcr p15, 0, r1, c8, c3, 0 @ invalidate shared TLBs
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mcr p15, 0, r1, c7, c1, 6 @ invalidate shared BTAC
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dsb
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isb
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/* the cpu was running with coherency disabled,
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* caches may be out of date */
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bl v7_flush_kern_cache_louis
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ldmfd sp!, {r4 - r11, pc}
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ENDPROC(tegra20_sleep_cpu_secondary_finish)
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/*
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* tegra20_tear_down_cpu
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*
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* Switches the CPU cluster to PLL-P and enters sleep.
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*/
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ENTRY(tegra20_tear_down_cpu)
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bl tegra_switch_cpu_to_pllp
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b tegra20_enter_sleep
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ENDPROC(tegra20_tear_down_cpu)
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/* START OF ROUTINES COPIED TO IRAM */
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.align L1_CACHE_SHIFT
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.globl tegra20_iram_start
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tegra20_iram_start:
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/*
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* tegra20_lp1_reset
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*
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* reset vector for LP1 restore; copied into IRAM during suspend.
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* Brings the system back up to a safe staring point (SDRAM out of
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* self-refresh, PLLC, PLLM and PLLP reenabled, CPU running on PLLP,
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* system clock running on the same PLL that it suspended at), and
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* jumps to tegra_resume to restore virtual addressing and PLLX.
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* The physical address of tegra_resume expected to be stored in
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* PMC_SCRATCH41.
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*
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* NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_LPx_RESUME_AREA.
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*/
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ENTRY(tegra20_lp1_reset)
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/*
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* The CPU and system bus are running at 32KHz and executing from
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* IRAM when this code is executed; immediately switch to CLKM and
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* enable PLLM, PLLP, PLLC.
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*/
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mov32 r0, TEGRA_CLK_RESET_BASE
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mov r1, #(1 << 28)
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str r1, [r0, #CLK_RESET_SCLK_BURST]
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str r1, [r0, #CLK_RESET_CCLK_BURST]
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mov r1, #0
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str r1, [r0, #CLK_RESET_CCLK_DIVIDER]
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str r1, [r0, #CLK_RESET_SCLK_DIVIDER]
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pll_enable r1, r0, CLK_RESET_PLLM_BASE
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pll_enable r1, r0, CLK_RESET_PLLP_BASE
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pll_enable r1, r0, CLK_RESET_PLLC_BASE
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adr r2, tegra20_sdram_pad_address
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adr r4, tegra20_sdram_pad_save
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mov r5, #0
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ldr r6, tegra20_sdram_pad_size
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padload:
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ldr r7, [r2, r5] @ r7 is the addr in the pad_address
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ldr r1, [r4, r5]
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str r1, [r7] @ restore the value in pad_save
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add r5, r5, #4
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cmp r6, r5
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bne padload
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padload_done:
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/* 255uS delay for PLL stabilization */
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mov32 r7, TEGRA_TMRUS_BASE
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ldr r1, [r7]
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add r1, r1, #0xff
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wait_until r1, r7, r9
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adr r4, tegra20_sclk_save
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ldr r4, [r4]
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str r4, [r0, #CLK_RESET_SCLK_BURST]
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mov32 r4, ((1 << 28) | (4)) @ burst policy is PLLP
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str r4, [r0, #CLK_RESET_CCLK_BURST]
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mov32 r0, TEGRA_EMC_BASE
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ldr r1, [r0, #EMC_CFG]
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bic r1, r1, #(1 << 31) @ disable DRAM_CLK_STOP
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str r1, [r0, #EMC_CFG]
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mov r1, #0
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str r1, [r0, #EMC_SELF_REF] @ take DRAM out of self refresh
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mov r1, #1
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str r1, [r0, #EMC_NOP]
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str r1, [r0, #EMC_NOP]
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emc_device_mask r1, r0
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exit_selfrefresh_loop:
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ldr r2, [r0, #EMC_EMC_STATUS]
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ands r2, r2, r1
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bne exit_selfrefresh_loop
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mov r1, #0 @ unstall all transactions
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str r1, [r0, #EMC_REQ_CTRL]
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mov32 r0, TEGRA_PMC_BASE
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ldr r0, [r0, #PMC_SCRATCH41]
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ret r0 @ jump to tegra_resume
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ENDPROC(tegra20_lp1_reset)
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/*
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* tegra20_tear_down_core
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*
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* copied into and executed from IRAM
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* puts memory in self-refresh for LP0 and LP1
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*/
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tegra20_tear_down_core:
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bl tegra20_sdram_self_refresh
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bl tegra20_switch_cpu_to_clk32k
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b tegra20_enter_sleep
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/*
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* tegra20_switch_cpu_to_clk32k
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*
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* In LP0 and LP1 all PLLs will be turned off. Switch the CPU and system clock
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* to the 32KHz clock.
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*/
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tegra20_switch_cpu_to_clk32k:
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/*
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* start by switching to CLKM to safely disable PLLs, then switch to
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* CLKS.
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*/
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mov r0, #(1 << 28)
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str r0, [r5, #CLK_RESET_SCLK_BURST]
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str r0, [r5, #CLK_RESET_CCLK_BURST]
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mov r0, #0
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str r0, [r5, #CLK_RESET_CCLK_DIVIDER]
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str r0, [r5, #CLK_RESET_SCLK_DIVIDER]
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/* 2uS delay delay between changing SCLK and disabling PLLs */
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mov32 r7, TEGRA_TMRUS_BASE
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ldr r1, [r7]
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add r1, r1, #2
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wait_until r1, r7, r9
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/* disable PLLM, PLLP and PLLC */
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ldr r0, [r5, #CLK_RESET_PLLM_BASE]
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bic r0, r0, #(1 << 30)
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str r0, [r5, #CLK_RESET_PLLM_BASE]
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ldr r0, [r5, #CLK_RESET_PLLP_BASE]
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bic r0, r0, #(1 << 30)
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str r0, [r5, #CLK_RESET_PLLP_BASE]
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ldr r0, [r5, #CLK_RESET_PLLC_BASE]
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bic r0, r0, #(1 << 30)
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str r0, [r5, #CLK_RESET_PLLC_BASE]
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/* switch to CLKS */
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mov r0, #0 /* brust policy = 32KHz */
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str r0, [r5, #CLK_RESET_SCLK_BURST]
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ret lr
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/*
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* tegra20_enter_sleep
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*
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* uses flow controller to enter sleep state
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* executes from IRAM with SDRAM in selfrefresh when target state is LP0 or LP1
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* executes from SDRAM with target state is LP2
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*/
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tegra20_enter_sleep:
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mov32 r6, TEGRA_FLOW_CTRL_BASE
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mov r0, #FLOW_CTRL_WAIT_FOR_INTERRUPT
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orr r0, r0, #FLOW_CTRL_HALT_CPU_IRQ | FLOW_CTRL_HALT_CPU_FIQ
|
|
cpu_id r1
|
|
cpu_to_halt_reg r1, r1
|
|
str r0, [r6, r1]
|
|
dsb
|
|
ldr r0, [r6, r1] /* memory barrier */
|
|
|
|
halted:
|
|
dsb
|
|
wfe /* CPU should be power gated here */
|
|
isb
|
|
b halted
|
|
|
|
/*
|
|
* tegra20_sdram_self_refresh
|
|
*
|
|
* called with MMU off and caches disabled
|
|
* puts sdram in self refresh
|
|
* must be executed from IRAM
|
|
*/
|
|
tegra20_sdram_self_refresh:
|
|
mov32 r1, TEGRA_EMC_BASE @ r1 reserved for emc base addr
|
|
|
|
mov r2, #3
|
|
str r2, [r1, #EMC_REQ_CTRL] @ stall incoming DRAM requests
|
|
|
|
emcidle:
|
|
ldr r2, [r1, #EMC_EMC_STATUS]
|
|
tst r2, #4
|
|
beq emcidle
|
|
|
|
mov r2, #1
|
|
str r2, [r1, #EMC_SELF_REF]
|
|
|
|
emc_device_mask r2, r1
|
|
|
|
emcself:
|
|
ldr r3, [r1, #EMC_EMC_STATUS]
|
|
and r3, r3, r2
|
|
cmp r3, r2
|
|
bne emcself @ loop until DDR in self-refresh
|
|
|
|
adr r2, tegra20_sdram_pad_address
|
|
adr r3, tegra20_sdram_pad_safe
|
|
adr r4, tegra20_sdram_pad_save
|
|
mov r5, #0
|
|
|
|
ldr r6, tegra20_sdram_pad_size
|
|
padsave:
|
|
ldr r0, [r2, r5] @ r0 is the addr in the pad_address
|
|
|
|
ldr r1, [r0]
|
|
str r1, [r4, r5] @ save the content of the addr
|
|
|
|
ldr r1, [r3, r5]
|
|
str r1, [r0] @ set the save val to the addr
|
|
|
|
add r5, r5, #4
|
|
cmp r6, r5
|
|
bne padsave
|
|
padsave_done:
|
|
|
|
mov32 r5, TEGRA_CLK_RESET_BASE
|
|
ldr r0, [r5, #CLK_RESET_SCLK_BURST]
|
|
adr r2, tegra20_sclk_save
|
|
str r0, [r2]
|
|
dsb
|
|
ret lr
|
|
|
|
tegra20_sdram_pad_address:
|
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL
|
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL
|
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CLKCFGPADCTRL
|
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2COMPPADCTRL
|
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2VTTGENPADCTRL
|
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL2
|
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL2
|
|
|
|
tegra20_sdram_pad_size:
|
|
.word tegra20_sdram_pad_size - tegra20_sdram_pad_address
|
|
|
|
tegra20_sdram_pad_safe:
|
|
.word 0x8
|
|
.word 0x8
|
|
.word 0x0
|
|
.word 0x8
|
|
.word 0x5500
|
|
.word 0x08080040
|
|
.word 0x0
|
|
|
|
tegra20_sclk_save:
|
|
.word 0x0
|
|
|
|
tegra20_sdram_pad_save:
|
|
.rept (tegra20_sdram_pad_size - tegra20_sdram_pad_address) / 4
|
|
.long 0
|
|
.endr
|
|
|
|
.ltorg
|
|
/* dummy symbol for end of IRAM */
|
|
.align L1_CACHE_SHIFT
|
|
.globl tegra20_iram_end
|
|
tegra20_iram_end:
|
|
b .
|
|
#endif
|