61 lines
1.5 KiB
ArmAsm
61 lines
1.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* L2C-310 early resume code. This can be used by platforms to restore
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* the settings of their L2 cache controller before restoring the
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* processor state.
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*
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* This code can only be used to if you are running in the secure world.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/hardware/cache-l2x0.h>
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.text
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ENTRY(l2c310_early_resume)
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adr r0, 1f
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ldr r2, [r0]
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add r0, r2, r0
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ldmia r0, {r1, r2, r3, r4, r5, r6, r7, r8}
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@ r1 = phys address of L2C-310 controller
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@ r2 = aux_ctrl
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@ r3 = tag_latency
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@ r4 = data_latency
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@ r5 = filter_start
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@ r6 = filter_end
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@ r7 = prefetch_ctrl
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@ r8 = pwr_ctrl
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@ Check that the address has been initialised
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teq r1, #0
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reteq lr
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@ The prefetch and power control registers are revision dependent
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@ and can be written whether or not the L2 cache is enabled
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ldr r0, [r1, #L2X0_CACHE_ID]
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and r0, r0, #L2X0_CACHE_ID_RTL_MASK
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cmp r0, #L310_CACHE_ID_RTL_R2P0
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strcs r7, [r1, #L310_PREFETCH_CTRL]
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cmp r0, #L310_CACHE_ID_RTL_R3P0
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strcs r8, [r1, #L310_POWER_CTRL]
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@ Don't setup the L2 cache if it is already enabled
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ldr r0, [r1, #L2X0_CTRL]
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tst r0, #L2X0_CTRL_EN
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retne lr
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str r3, [r1, #L310_TAG_LATENCY_CTRL]
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str r4, [r1, #L310_DATA_LATENCY_CTRL]
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str r6, [r1, #L310_ADDR_FILTER_END]
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str r5, [r1, #L310_ADDR_FILTER_START]
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str r2, [r1, #L2X0_AUX_CTRL]
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mov r9, #L2X0_CTRL_EN
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str r9, [r1, #L2X0_CTRL]
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ret lr
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ENDPROC(l2c310_early_resume)
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.align
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1: .long l2x0_saved_regs - .
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