| /* |
| * sh7372 lowlevel sleep code for "Core Standby Mode" |
| * |
| * Copyright (C) 2011 Magnus Damm |
| * |
| * In "Core Standby Mode" the ARM core is off, but L2 cache is still on |
| * |
| * Based on mach-omap2/sleep34xx.S |
| * |
| * (C) Copyright 2007 Texas Instruments |
| * Karthik Dasu <karthik-dp@ti.com> |
| * |
| * (C) Copyright 2004 Texas Instruments, <www.ti.com> |
| * Richard Woodruff <r-woodruff2@ti.com> |
| * |
| * 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. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/init.h> |
| #include <asm/memory.h> |
| #include <asm/assembler.h> |
| |
| #if defined(CONFIG_SUSPEND) || defined(CONFIG_CPU_IDLE) |
| .align 12 |
| .text |
| .global sh7372_resume_core_standby_sysc |
| sh7372_resume_core_standby_sysc: |
| ldr pc, 1f |
| |
| .align 2 |
| .globl sh7372_cpu_resume |
| sh7372_cpu_resume: |
| 1: .space 4 |
| |
| #define SPDCR 0xe6180008 |
| |
| /* A3SM & A4S power down */ |
| .global sh7372_do_idle_sysc |
| sh7372_do_idle_sysc: |
| mov r8, r0 /* sleep mode passed in r0 */ |
| |
| /* |
| * 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 |
| |
| /* |
| * Clean and invalidate data cache again. |
| */ |
| ldr r1, kernel_flush |
| blx r1 |
| |
| /* disable L2 cache in the aux control register */ |
| mrc p15, 0, r10, c1, c0, 1 |
| bic r10, r10, #2 |
| mcr p15, 0, r10, c1, c0, 1 |
| isb |
| |
| /* |
| * The kernel doesn't interwork: v7_flush_dcache_all in particluar will |
| * always return in Thumb state when CONFIG_THUMB2_KERNEL is enabled. |
| * This sequence switches back to ARM. Note that .align may insert a |
| * nop: bx pc needs to be word-aligned in order to work. |
| */ |
| THUMB( .thumb ) |
| THUMB( .align ) |
| THUMB( bx pc ) |
| THUMB( nop ) |
| .arm |
| |
| /* Data memory barrier and Data sync barrier */ |
| dsb |
| dmb |
| |
| /* SYSC power down */ |
| ldr r0, =SPDCR |
| str r8, [r0] |
| 1: |
| b 1b |
| |
| .align 2 |
| kernel_flush: |
| .word v7_flush_dcache_all |
| #endif |
