diff options
Diffstat (limited to 'arch/arm/mach-msm/idle-v6.S')
| -rw-r--r-- | arch/arm/mach-msm/idle-v6.S | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/idle-v6.S b/arch/arm/mach-msm/idle-v6.S new file mode 100644 index 000000000000..1c74c6436a4e --- /dev/null +++ b/arch/arm/mach-msm/idle-v6.S @@ -0,0 +1,177 @@ +/* + * Idle processing for ARMv6-based Qualcomm SoCs. + * Work around bugs with SWFI. + * + * Copyright (C) 2007 Google, Inc. + * Copyright (c) 2007-2009, Code Aurora Forum. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> + +ENTRY(msm_arch_idle) + mov r0, #0 + mcr p15, 0, r0, c7, c10, 0 /* flush entire data cache */ + mrc p15, 0, r1, c1, c0, 0 /* read current CR */ + bic r0, r1, #(1 << 2) /* clear dcache bit */ + bic r0, r0, #(1 << 12) /* clear icache bit */ + mcr p15, 0, r0, c1, c0, 0 /* disable d/i cache */ + + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 /* dsb */ + mcr p15, 0, r0, c7, c0, 4 /* wait for interrupt */ + + mcr p15, 0, r1, c1, c0, 0 /* restore d/i cache */ + mcr p15, 0, r0, c7, c5, 4 /* isb */ + + mov pc, lr + +ENTRY(msm_pm_collapse) + ldr r0, =saved_state + stmia r0!, {r4-r14} + +#if defined(CONFIG_MSM_FIQ_SUPPORT) + cpsid f +#endif + mrc p15, 0, r1, c1, c0, 0 /* MMU control */ + mrc p15, 0, r2, c2, c0, 0 /* ttb */ + mrc p15, 0, r3, c3, c0, 0 /* dacr */ + mrc p15, 0, ip, c13, c0, 1 /* context ID */ + stmia r0!, {r1-r3, ip} +#if defined(CONFIG_OPROFILE) + mrc p15, 0, r1, c15, c12, 0 /* pmnc */ + mrc p15, 0, r2, c15, c12, 1 /* ccnt */ + mrc p15, 0, r3, c15, c12, 2 /* pmn0 */ + mrc p15, 0, ip, c15, c12, 3 /* pmn1 */ + stmia r0!, {r1-r3, ip} +#endif + mrc p15, 0, r1, c1, c0, 2 /* read CACR */ + stmia r0!, {r1} + + mov r0, #0 + mcr p15, 0, r0, c7, c10, 0 /* flush entire data cache */ + mrc p15, 0, r1, c1, c0, 0 /* read current CR */ + bic r0, r1, #(1 << 2) /* clear dcache bit */ + bic r0, r0, #(1 << 12) /* clear icache bit */ + mcr p15, 0, r0, c1, c0, 0 /* disable d/i cache */ + + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 /* dsb */ + mcr p15, 0, r0, c7, c0, 4 /* wait for interrupt */ + + mcr p15, 0, r1, c1, c0, 0 /* restore d/i cache */ + mcr p15, 0, r0, c7, c5, 4 /* isb */ + +#if defined(CONFIG_MSM_FIQ_SUPPORT) + cpsie f +#endif + + ldr r0, =saved_state /* restore registers */ + ldmfd r0, {r4-r14} + mov r0, #0 /* return power collapse failed */ + mov pc, lr + +ENTRY(msm_pm_collapse_exit) +#if 0 /* serial debug */ + mov r0, #0x80000016 + mcr p15, 0, r0, c15, c2, 4 + mov r0, #0xA9000000 + add r0, r0, #0x00A00000 /* UART1 */ + /*add r0, r0, #0x00C00000*/ /* UART3 */ + mov r1, #'A' + str r1, [r0, #0x00C] +#endif + ldr r1, =saved_state_end + ldr r2, =msm_pm_collapse_exit + adr r3, msm_pm_collapse_exit + add r1, r1, r3 + sub r1, r1, r2 + + ldmdb r1!, {r2} + mcr p15, 0, r2, c1, c0, 2 /* restore CACR */ +#if defined(CONFIG_OPROFILE) + ldmdb r1!, {r2-r5} + mcr p15, 0, r3, c15, c12, 1 /* ccnt */ + mcr p15, 0, r4, c15, c12, 2 /* pmn0 */ + mcr p15, 0, r5, c15, c12, 3 /* pmn1 */ + mcr p15, 0, r2, c15, c12, 0 /* pmnc */ +#endif + ldmdb r1!, {r2-r5} + mcr p15, 0, r4, c3, c0, 0 /* dacr */ + mcr p15, 0, r3, c2, c0, 0 /* ttb */ + mcr p15, 0, r5, c13, c0, 1 /* context ID */ + mov r0, #0 + mcr p15, 0, r0, c7, c5, 4 /* isb */ + ldmdb r1!, {r4-r14} + + /* Add 1:1 map in the PMD to allow smooth switch when turning on MMU */ + and r3, r3, #~0x7F /* mask off lower 7 bits of TTB */ + adr r0, msm_pm_mapped_pa /* get address of the mapped instr */ + lsr r1, r0, #20 /* get the addr range of addr in MB */ + lsl r1, r1, #2 /* multiply by 4 to get to the pg index */ + add r3, r3, r1 /* pgd + pgd_index(addr) */ + ldr r1, [r3] /* save current entry to r1 */ + lsr r0, #20 /* align current addr to 1MB boundary */ + lsl r0, #20 + /* Create new entry for this 1MB page */ + orr r0, r0, #0x400 /* PMD_SECT_AP_WRITE */ + orr r0, r0, #0x2 /* PMD_TYPE_SECT|PMD_DOMAIN(DOMAIN_KERNEL) */ + str r0, [r3] /* put new entry into the MMU table */ + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 /* dsb */ + mcr p15, 0, r2, c1, c0, 0 /* MMU control */ + mcr p15, 0, r0, c7, c5, 4 /* isb */ +msm_pm_mapped_pa: + /* Switch to virtual */ + adr r2, msm_pm_pa_to_va + ldr r0, =msm_pm_pa_to_va + mov pc, r0 +msm_pm_pa_to_va: + sub r0, r0, r2 + /* Restore r1 in MMU table */ + add r3, r3, r0 + str r1, [r3] + + mov r0, #0 + mcr p15, 0, r0, c7, c10, 0 /* flush entire data cache */ + mcr p15, 0, r0, c7, c10, 4 /* dsb */ + mcr p15, 0, r0, c7, c5, 4 /* isb */ + mcr p15, 0, r0, c8, c7, 0 /* invalidate entire unified TLB */ + mcr p15, 0, r0, c7, c5, 6 /* invalidate entire branch target + * cache */ + mcr p15, 0, r0, c7, c7, 0 /* invalidate both data and instruction + * cache */ + mcr p15, 0, r0, c7, c10, 4 /* dsb */ + mcr p15, 0, r0, c7, c5, 4 /* isb */ + + mov r0, #1 + mov pc, lr + nop + nop + nop + nop + nop +1: b 1b + + + .data + +saved_state: + .space 4 * 11 /* r4-14 */ + .space 4 * 4 /* cp15 - MMU control, ttb, dacr, context ID */ +#if defined(CONFIG_OPROFILE) + .space 4 * 4 /* more cp15 - pmnc, ccnt, pmn0, pmn1 */ +#endif + .space 4 /* cacr */ +saved_state_end: + |