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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5b795d051c
Add support to the Tegra CPU reset vector to detect whether the CPU is resuming from LP1 suspend state. If it is, branch to the LP1-specific resume code. When Tegra enters the LP1 suspend state, the SDRAM controller is placed into a self-refresh state. For this reason, we must place the LP1 resume code into IRAM, so that it is accessible before SDRAM access has been re-enabled. Signed-off-by: Joseph Lo <josephl@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
293 lines
6.9 KiB
ArmAsm
293 lines
6.9 KiB
ArmAsm
/*
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* Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/cache.h>
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#include <asm/asm-offsets.h>
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#include <asm/hardware/cache-l2x0.h>
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#include "flowctrl.h"
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#include "fuse.h"
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#include "iomap.h"
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#include "reset.h"
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#include "sleep.h"
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#define PMC_SCRATCH41 0x140
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#define RESET_DATA(x) ((TEGRA_RESET_##x)*4)
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#ifdef CONFIG_PM_SLEEP
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/*
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* tegra_resume
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*
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* CPU boot vector when restarting the a CPU following
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* an LP2 transition. Also branched to by LP0 and LP1 resume after
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* re-enabling sdram.
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*
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* r6: SoC ID
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* r8: CPU part number
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*/
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ENTRY(tegra_resume)
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check_cpu_part_num 0xc09, r8, r9
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bleq v7_invalidate_l1
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blne tegra_init_l2_for_a15
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cpu_id r0
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tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
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cmp r6, #TEGRA114
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beq no_cpu0_chk
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cmp r0, #0 @ CPU0?
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THUMB( it ne )
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bne cpu_resume @ no
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no_cpu0_chk:
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/* Are we on Tegra20? */
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cmp r6, #TEGRA20
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beq 1f @ Yes
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/* Clear the flow controller flags for this CPU. */
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cpu_to_csr_reg r1, r0
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mov32 r2, TEGRA_FLOW_CTRL_BASE
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ldr r1, [r2, r1]
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/* Clear event & intr flag */
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orr r1, r1, \
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#FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
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movw r0, #0x3FFD @ enable, cluster_switch, immed, bitmaps
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@ & ext flags for CPU power mgnt
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bic r1, r1, r0
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str r1, [r2]
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1:
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mov32 r9, 0xc09
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cmp r8, r9
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bne not_ca9
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#ifdef CONFIG_HAVE_ARM_SCU
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/* enable SCU */
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mov32 r0, TEGRA_ARM_PERIF_BASE
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ldr r1, [r0]
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orr r1, r1, #1
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str r1, [r0]
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#endif
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/* L2 cache resume & re-enable */
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l2_cache_resume r0, r1, r2, l2x0_saved_regs_addr
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not_ca9:
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b cpu_resume
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ENDPROC(tegra_resume)
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#endif
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#ifdef CONFIG_CACHE_L2X0
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.globl l2x0_saved_regs_addr
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l2x0_saved_regs_addr:
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.long 0
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#endif
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.align L1_CACHE_SHIFT
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ENTRY(__tegra_cpu_reset_handler_start)
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/*
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* __tegra_cpu_reset_handler:
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*
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* Common handler for all CPU reset events.
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*
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* Register usage within the reset handler:
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*
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* Others: scratch
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* R6 = SoC ID
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* R7 = CPU present (to the OS) mask
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* R8 = CPU in LP1 state mask
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* R9 = CPU in LP2 state mask
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* R10 = CPU number
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* R11 = CPU mask
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* R12 = pointer to reset handler data
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*
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* NOTE: This code is copied to IRAM. All code and data accesses
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* must be position-independent.
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*/
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.align L1_CACHE_SHIFT
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ENTRY(__tegra_cpu_reset_handler)
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cpsid aif, 0x13 @ SVC mode, interrupts disabled
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tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
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#ifdef CONFIG_ARCH_TEGRA_2x_SOC
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t20_check:
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cmp r6, #TEGRA20
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bne after_t20_check
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t20_errata:
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# Tegra20 is a Cortex-A9 r1p1
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mrc p15, 0, r0, c1, c0, 0 @ read system control register
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orr r0, r0, #1 << 14 @ erratum 716044
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mcr p15, 0, r0, c1, c0, 0 @ write system control register
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mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
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orr r0, r0, #1 << 4 @ erratum 742230
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orr r0, r0, #1 << 11 @ erratum 751472
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mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
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b after_errata
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after_t20_check:
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#endif
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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t30_check:
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cmp r6, #TEGRA30
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bne after_t30_check
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t30_errata:
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# Tegra30 is a Cortex-A9 r2p9
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mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
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orr r0, r0, #1 << 6 @ erratum 743622
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orr r0, r0, #1 << 11 @ erratum 751472
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mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
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b after_errata
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after_t30_check:
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#endif
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after_errata:
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mrc p15, 0, r10, c0, c0, 5 @ MPIDR
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and r10, r10, #0x3 @ R10 = CPU number
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mov r11, #1
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mov r11, r11, lsl r10 @ R11 = CPU mask
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adr r12, __tegra_cpu_reset_handler_data
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#ifdef CONFIG_SMP
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/* Does the OS know about this CPU? */
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ldr r7, [r12, #RESET_DATA(MASK_PRESENT)]
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tst r7, r11 @ if !present
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bleq __die @ CPU not present (to OS)
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#endif
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#ifdef CONFIG_ARCH_TEGRA_2x_SOC
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/* Are we on Tegra20? */
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cmp r6, #TEGRA20
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bne 1f
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/* If not CPU0, don't let CPU0 reset CPU1 now that CPU1 is coming up. */
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mov32 r5, TEGRA_PMC_BASE
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mov r0, #0
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cmp r10, #0
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strne r0, [r5, #PMC_SCRATCH41]
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1:
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#endif
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/* Waking up from LP1? */
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ldr r8, [r12, #RESET_DATA(MASK_LP1)]
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tst r8, r11 @ if in_lp1
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beq __is_not_lp1
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cmp r10, #0
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bne __die @ only CPU0 can be here
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ldr lr, [r12, #RESET_DATA(STARTUP_LP1)]
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cmp lr, #0
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bleq __die @ no LP1 startup handler
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THUMB( add lr, lr, #1 ) @ switch to Thumb mode
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bx lr
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__is_not_lp1:
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/* Waking up from LP2? */
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ldr r9, [r12, #RESET_DATA(MASK_LP2)]
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tst r9, r11 @ if in_lp2
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beq __is_not_lp2
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ldr lr, [r12, #RESET_DATA(STARTUP_LP2)]
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cmp lr, #0
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bleq __die @ no LP2 startup handler
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bx lr
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__is_not_lp2:
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#ifdef CONFIG_SMP
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/*
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* Can only be secondary boot (initial or hotplug)
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* CPU0 can't be here for Tegra20/30
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*/
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cmp r6, #TEGRA114
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beq __no_cpu0_chk
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cmp r10, #0
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bleq __die @ CPU0 cannot be here
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__no_cpu0_chk:
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ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)]
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cmp lr, #0
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bleq __die @ no secondary startup handler
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bx lr
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#endif
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/*
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* We don't know why the CPU reset. Just kill it.
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* The LR register will contain the address we died at + 4.
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*/
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__die:
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sub lr, lr, #4
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mov32 r7, TEGRA_PMC_BASE
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str lr, [r7, #PMC_SCRATCH41]
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mov32 r7, TEGRA_CLK_RESET_BASE
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/* Are we on Tegra20? */
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cmp r6, #TEGRA20
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bne 1f
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#ifdef CONFIG_ARCH_TEGRA_2x_SOC
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mov32 r0, 0x1111
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mov r1, r0, lsl r10
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str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
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#endif
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1:
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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mov32 r6, TEGRA_FLOW_CTRL_BASE
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cmp r10, #0
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moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS
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moveq r2, #FLOW_CTRL_CPU0_CSR
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movne r1, r10, lsl #3
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addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8)
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addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8)
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/* Clear CPU "event" and "interrupt" flags and power gate
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it when halting but not before it is in the "WFI" state. */
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ldr r0, [r6, +r2]
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orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
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orr r0, r0, #FLOW_CTRL_CSR_ENABLE
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str r0, [r6, +r2]
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/* Unconditionally halt this CPU */
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mov r0, #FLOW_CTRL_WAITEVENT
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str r0, [r6, +r1]
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ldr r0, [r6, +r1] @ memory barrier
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dsb
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isb
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wfi @ CPU should be power gated here
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/* If the CPU didn't power gate above just kill it's clock. */
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mov r0, r11, lsl #8
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str r0, [r7, #348] @ CLK_CPU_CMPLX_SET
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#endif
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/* If the CPU still isn't dead, just spin here. */
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b .
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ENDPROC(__tegra_cpu_reset_handler)
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.align L1_CACHE_SHIFT
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.type __tegra_cpu_reset_handler_data, %object
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.globl __tegra_cpu_reset_handler_data
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__tegra_cpu_reset_handler_data:
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.rept TEGRA_RESET_DATA_SIZE
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.long 0
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.endr
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.align L1_CACHE_SHIFT
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ENTRY(__tegra_cpu_reset_handler_end)
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