diff options
Diffstat (limited to 'arch/arm/mach-mvf/mvf_suspend.S')
| -rw-r--r-- | arch/arm/mach-mvf/mvf_suspend.S | 484 |
1 files changed, 484 insertions, 0 deletions
diff --git a/arch/arm/mach-mvf/mvf_suspend.S b/arch/arm/mach-mvf/mvf_suspend.S new file mode 100644 index 000000000000..ce9205162538 --- /dev/null +++ b/arch/arm/mach-mvf/mvf_suspend.S @@ -0,0 +1,484 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/linkage.h> +#include <mach/hardware.h> +#include <asm/memory.h> +#include <mach/mvf.h> +#include "regs-src.h" +#include "crm_regs.h" + +#define PERIPBASE_VIRT_OFFSET 0xb2000000 +#define TTRBIT_MASK 0xffffc000 +#define TABLE_INDEX_MASK 0xfff00000 +#define TABLE_ENTRY 0x00000c02 +#define CACHE_DISABLE_MASK 0xfffffffb +#define IRAM_SUSPEND_SIZE (1 << 15) + +/************************************************************* +mvf_suspend: + +Suspend the processor (eg, wait for interrupt). + +r1: iram_paddr +r2: suspend_iram_base +*************************************************************/ + + .macro mvf_stop_mode_enter + + ldr r3, =MVF_ANATOP_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + + /* pll7 disable */ + ldr r4, [r3, #0x20] + bic r4, r4, #0x2000 + str r4, [r3, #0x20] + + /* pll3 disable */ + ldr r4, [r3, #0x10] + bic r4, r4, #0x2000 + str r4, [r3, #0x10] + + /* pll4 disable */ + ldr r4, [r3, #0x70] + bic r4, r4, #0x2000 + str r4, [r3, #0x70] + + /* pll6 disable */ + ldr r4, [r3, #0xa0] + bic r4, r4, #0x2000 + str r4, [r3, #0xa0] + + /* pll5 disable */ + ldr r4, [r3, #0xe0] + bic r4, r4, #0x2000 + str r4, [r3, #0xe0] + + /* pll1 disable */ + ldr r4, [r3, #0x270] + bic r4, r4, #0x2000 + str r4, [r3, #0x270] + + /* stop mode is masked to Anatop */ + ldr r3, =MVF_CCM_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + + ldr r4, [r3, #0x2c] + bic r4, r4, #0x100 + str r4, [r3, #0x2c] + + ldr r3, =MVF_GPC_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + + /* ensure power domain 0 */ + ldr r4, [r3, #0x0] + bic r4, r4, #0x01 + str r4, [r3, #0x0] + + /* enable deep sleep for memories */ + ldr r4, [r3, #0x0] + orr r4, r4, #0x80 + str r4, [r3, #0x0] + + /* disable well bias */ + ldr r4, [r3, #0x0] + bic r4, r4, #0x10 + str r4, [r3, #0x0] + + /* turn off HPREG in stop mode */ + ldr r4, [r3, #0x0] + orr r4, r4, #0x08 + str r4, [r3, #0x0] + + /* gpc_lpmr set stop mode */ + ldr r4, =0x02 + str r4, [r3, #0x40] + + .endm + + .macro mvf_lpstop_mode_enter + + ldr r3, =MVF_ANATOP_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + + /* pll7 disable */ + ldr r4, [r3, #0x20] + bic r4, r4, #0x2000 + str r4, [r3, #0x20] + + /* pll3 disable */ + ldr r4, [r3, #0x10] + bic r4, r4, #0x2000 + str r4, [r3, #0x10] + + /* pll4 disable */ + ldr r4, [r3, #0x70] + bic r4, r4, #0x2000 + str r4, [r3, #0x70] + + /* pll6 disable */ + ldr r4, [r3, #0xa0] + bic r4, r4, #0x2000 + str r4, [r3, #0xa0] + + /* pll5 disable */ + ldr r4, [r3, #0xe0] + bic r4, r4, #0x2000 + str r4, [r3, #0xe0] + + /* pll1 disable */ + ldr r4, [r3, #0x270] + bic r4, r4, #0x2000 + str r4, [r3, #0x270] + + ldr r3, =MVF_CCM_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + + ldr r4, [r3, #0x2c] + bic r4, r4, #0x100 + str r4, [r3, #0x2c] + + ldr r3, =MVF_GPC_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + + /* enable deep sleep for memories */ + ldr r4, [r3, #0x0] + orr r4, r4, #0x40 + str r4, [r3, #0x0] + + /* enable LPSTOP3 */ + ldr r4, [r3, #0x0] + bic r4, r4, #0x04 + bic r4, r4, #0x02 + str r4, [r3, #0x0] + + /* ensure power domain 1 */ + ldr r4, [r3, #0x0] + orr r4, r4, #0x01 + str r4, [r3, #0x0] + + /* gpc_lpmr set low-power stop mode */ + ldr r4, =0x02 + str r4, [r3, #0x40] + + .endm + +/****************************************************************** +Invalidate l1 dcache, r0-r4, r6, r7 used +******************************************************************/ + .macro invalidate_l1_dcache + + mov r0, #0 + mcr p15, 2, r0, c0, c0, 0 + mrc p15, 1, r0, c0, c0, 0 + + ldr r1, =0x7fff + and r2, r1, r0, lsr #13 + + ldr r1, =0x3ff + + and r3, r1, r0, lsr #3 @ NumWays - 1 + add r2, r2, #1 @ NumSets + + and r0, r0, #0x7 + add r0, r0, #4 @ SetShift + + clz r1, r3 @ WayShift + add r4, r3, #1 @ NumWays +1: + sub r2, r2, #1 @ NumSets-- + mov r3, r4 @ Temp = NumWays +2: + subs r3, r3, #1 @ Temp-- + mov r7, r3, lsl r1 + mov r6, r2, lsl r0 + orr r7, r7, r6 + mcr p15, 0, r7, c7, c6, 2 + bgt 2b + cmp r2, #0 + bgt 1b + dsb + isb + + .endm + +/****************************************************************** +Flush and disable L1 dcache +******************************************************************/ + .macro flush_disable_l1_dcache + + /* + * Flush all data from the L1 data cache before disabling + * SCTLR.C bit. + */ + push {r0-r12, lr} + ldr r0, =v7_flush_dcache_all + mov lr, pc + mov pc, r0 + pop {r0-r12, lr} + + /* + * Clear the SCTLR.C bit to prevent further data cache + * allocation. Clearing SCTLR.C would make all the data accesses + * strongly ordered and would not hit the cache. + */ + mrc p15, 0, r0, c1, c0, 0 + bic r0, r0, #(1 << 2) @ Disable the C bit + mcr p15, 0, r0, c1, c0, 0 + isb + + /* + * Invalidate L1 data cache. Even though only invalidate is + * necessary exported flush API is used here. Doing clean + * on already clean cache would be almost NOP. + */ + push {r0-r12, lr} + ldr r0, =v7_flush_dcache_all + mov lr, pc + mov pc, r0 + pop {r0-r12, lr} + + /* + * Execute an ISB instruction to ensure that all of the + * CP15 register changes have been committed. + */ + isb + + /* + * Execute a barrier instruction to ensure that all cache, + * TLB and branch predictor maintenance operations issued + * by any CPU in the cluster have completed. + */ + dsb + dmb + + .endm + +ENTRY(mvf_suspend) + stmfd sp!, {r0-r12} @ Save registers +/************************************************************* +suspend mode entry +*************************************************************/ + mov r11, r0 + + cmp r0, #0x1 + bne dormant + + /* Need to flush and disable L1 dcache*/ + flush_disable_l1_dcache + + wfi + + nop + nop + nop + nop + + /* Invalidate L1 I-cache first */ + mov r1, #0x0 + mcr p15, 0, r1, c7, c5, 0 @ Invalidate I-Cache + + /* Need to invalidate L1 dcache, as the power is dropped */ + invalidate_l1_dcache + + /* Enable L1 dcache first */ + mrc p15, 0, r0, c1, c0, 0 + orr r0, r0, #(1 << 2) @ Disable the C bit + mcr p15, 0, r0, c1, c0, 0 + +/*********************************************************** +never run to here +************************************************************/ + b out /* exit standby */ + /* Place the literal pool here so that literals are + within 16KB range */ + .ltorg + +/************************************************************ +dormant entry, data save in stack +************************************************************/ +dormant: + +/************************************************************ +saved register and context as below: + sp + spsr + lr + CPACR + TTBR0 + TTBR1 + TTBCR + DACR + PRRR + NMRR + ACTLR + Context ID + User r/w thread ID + Secure or NS VBAR + CPSR + SCTLR +************************************************************/ + /* stack is from the tail of iram_suspend base */ + mov r0, r2 /* get suspend_iram_base */ + add r0, r0, #IRAM_SUSPEND_SIZE + + mov r4, r11 @ Store state entered + stmfd r0!, {r4} + + mov r4, sp @ Store sp + mrs r5, spsr @ Store spsr + mov r6, lr @ Store lr + stmfd r0!, {r4-r6} + + /* c1 and c2 registers */ + mrc p15, 0, r4, c1, c0, 2 @ CPACR + mrc p15, 0, r5, c2, c0, 0 @ TTBR0 + mrc p15, 0, r6, c2, c0, 1 @ TTBR1 + mrc p15, 0, r7, c2, c0, 2 @ TTBCR + stmfd r0!, {r4-r7} + + /* c3 and c10 registers */ + mrc p15, 0, r4, c3, c0, 0 @ DACR + mrc p15, 0, r5, c10, c2, 0 @ PRRR + mrc p15, 0, r6, c10, c2, 1 @ NMRR + mrc p15, 0, r7, c1, c0, 1 @ ACTLR + stmfd r0!,{r4-r7} + + /* c12, c13 and CPSR registers */ + mrc p15, 0, r4, c13, c0, 1 @ Context ID + mrc p15, 0, r5, c13, c0, 2 @ User r/w thread ID + mrc p15, 0, r6, c12, c0, 0 @ Secure or NS VBAR + mrs r7, cpsr @ Store CPSR + stmfd r0!, {r4-r7} + + /* c1 control register */ + mrc p15, 0, r4, c1, c0, 0 @ SCTLR + stmfd r0!, {r4} + + /* Need to flush and disable L1 dcache*/ + flush_disable_l1_dcache + + /* Make sure TLBs are primed */ + ldr r1, =MVF_IOMUXC_BASE_ADDR + add r1, r1, #PERIPBASE_VIRT_OFFSET + add r1, r1, #0x20000 + ldr r0, [r1] + ldr r1, =MVF_SRC_BASE_ADDR + add r1, r1, #PERIPBASE_VIRT_OFFSET + add r1, r1, #0x20000 + ldr r0, [r1] + ldr r1, =MVF_CCM_BASE_ADDR + add r1, r1, #PERIPBASE_VIRT_OFFSET + add r1, r1, #0x20000 + ldr r0, [r1] + ldr r1, =MVF_GPC_BASE_ADDR + add r1, r1, #PERIPBASE_VIRT_OFFSET + add r1, r1, #0x20000 + ldr r0, [r1] + ldr r1, =MVF_CCM_BASE_ADDR + add r1, r1, #PERIPBASE_VIRT_OFFSET + add r1, r1, #0x20000 + ldr r0, [r1] + + /* Do a DSB to drain the buffers */ + dsb + + mvf_stop_mode_enter + +/**************************************************************** +execute a wfi instruction to let SOC go into stop mode. +****************************************************************/ + wfi + + nop + nop + nop + nop + +/**************************************************************** +if go here, means there is a wakeup irq pending, we should resume +system immediately. +****************************************************************/ + mov r0, r2 /* get suspend_iram_base */ + add r0, r0, #IRAM_SUSPEND_SIZE + + ldmea r0!, {r11} @ standby or mem + + /* mask all the GPC interrupts */ + ldr r3, =MVF_GPC_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + ldr r4, =0xffffffff + str r4, [r3, #0x44] + str r4, [r3, #0x48] + str r4, [r3, #0x4c] + str r4, [r3, #0x50] + + /* pll2 enable */ + ldr r3, =MVF_ANATOP_BASE_ADDR + add r3, r3, #PERIPBASE_VIRT_OFFSET + add r3, r3, #0x20000 + + ldr r4, [r3, #0x30] + orr r4, r4, #0x2000 + str r4, [r3, #0x30] + + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop + + nop + nop + nop + nop + nop + + mrc p15, 0, r1, c1, c0, 0 + orr r1, r1, #(1 << 2) @ Enable the C bit + mcr p15, 0, r1, c1, c0, 0 + + b out + +/************************************************ +return back to mvf_suspend_enter for suspend +*************************************************/ +out: + ldmfd sp!, {r0-r12} + mov pc, lr + + .type mvf_do_suspend, #object +ENTRY(mvf_do_suspend) + .word mvf_suspend + .size mvf_suspend, . - mvf_suspend |