/* * linux/arch/arm/mach-omap1/sleep.S * * Low-level OMAP7XX/1510/1610 sleep/wakeUp support * * Initial SA1110 code: * Copyright (c) 2001 Cliff Brake * * Adapted for PXA by Nicolas Pitre: * Copyright (c) 2002 Monta Vista Software, Inc. * * Support for OMAP1510/1610 by Dirk Behme * * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * 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., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include "pm.h" .text /* * Forces OMAP into deep sleep state * * omapXXXX_cpu_suspend() * * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1 * in register r1. * * Note: This code get's copied to internal SRAM at boot. When the OMAP * wakes up it continues execution at the point it went to sleep. * * Note: Because of errata work arounds we have processor specific functions * here. They are mostly the same, but slightly different. * */ #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) ENTRY(omap7xx_cpu_suspend) @ save registers on stack stmfd sp!, {r0 - r12, lr} @ Drain write cache mov r4, #0 mcr p15, 0, r0, c7, c10, 4 nop @ load base address of Traffic Controller mov r6, #TCMIF_ASM_BASE & 0xff000000 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00 @ prepare to put SDRAM into self-refresh manually ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] orr r9, r7, #SELF_REFRESH_MODE & 0xff000000 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] @ prepare to put EMIFS to Sleep ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff] orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff] @ load base address of ARM_IDLECT1 and ARM_IDLECT2 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 @ turn off clock domains @ do not disable PERCK (0x04) mov r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff orr r5, r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff00 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] @ request ARM idle mov r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff orr r3, r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff00 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] @ disable instruction cache mrc p15, 0, r9, c1, c0, 0 bic r2, r9, #0x1000 mcr p15, 0, r2, c1, c0, 0 nop /* * Let's wait for the next wake up event to wake us up. r0 can't be * used here because r0 holds ARM_IDLECT1 */ mov r2, #0 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt /* * omap7xx_cpu_suspend()'s resume point. * * It will just start executing here, so we'll restore stuff from the * stack. */ @ re-enable Icache mcr p15, 0, r9, c1, c0, 0 @ reset the ARM_IDLECT1 and ARM_IDLECT2. strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] @ Restore EMIFF controls str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff] @ restore regs and return ldmfd sp!, {r0 - r12, pc} ENTRY(omap7xx_cpu_suspend_sz) .word . - omap7xx_cpu_suspend #endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */ #ifdef CONFIG_ARCH_OMAP15XX ENTRY(omap1510_cpu_suspend) @ save registers on stack stmfd sp!, {r0 - r12, lr} @ load base address of Traffic Controller mov r4, #TCMIF_ASM_BASE & 0xff000000 orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000 orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00 @ work around errata of OMAP1510 PDE bit for TC shut down @ clear PDE bit ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] bic r5, r5, #PDE_BIT & 0xff str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] @ set PWD_EN bit and r5, r5, #PWD_EN_BIT & 0xff str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] @ prepare to put SDRAM into self-refresh manually ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] orr r5, r5, #SELF_REFRESH_MODE & 0xff000000 orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] @ prepare to put EMIFS to Sleep ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] @ load base address of ARM_IDLECT1 and ARM_IDLECT2 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 @ turn off clock domains mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] @ request ARM idle mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] mov r5, #IDLE_WAIT_CYCLES & 0xff orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 l_1510_2: subs r5, r5, #1 bne l_1510_2 /* * Let's wait for the next wake up event to wake us up. r0 can't be * used here because r0 holds ARM_IDLECT1 */ mov r2, #0 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt /* * omap1510_cpu_suspend()'s resume point. * * It will just start executing here, so we'll restore stuff from the * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. */ strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] @ restore regs and return ldmfd sp!, {r0 - r12, pc} ENTRY(omap1510_cpu_suspend_sz) .word . - omap1510_cpu_suspend #endif /* CONFIG_ARCH_OMAP15XX */ #if defined(CONFIG_ARCH_OMAP16XX) ENTRY(omap1610_cpu_suspend) @ save registers on stack stmfd sp!, {r0 - r12, lr} @ Drain write cache mov r4, #0 mcr p15, 0, r0, c7, c10, 4 nop @ Load base address of Traffic Controller mov r6, #TCMIF_ASM_BASE & 0xff000000 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00 @ Prepare to put SDRAM into self-refresh manually ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] orr r9, r7, #SELF_REFRESH_MODE & 0xff000000 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] @ Prepare to put EMIFS to Sleep ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff] orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff] @ Load base address of ARM_IDLECT1 and ARM_IDLECT2 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 @ Turn off clock domains @ Do not disable PERCK (0x04) mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] @ Request ARM idle mov r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff orr r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] /* * Let's wait for the next wake up event to wake us up. r0 can't be * used here because r0 holds ARM_IDLECT1 */ mov r2, #0 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt @ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions @ according to this formula: @ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV @ Max DPLL_MULT = 18 @ DPLL_DIV = 1 @ ARMDIV = 1 @ => 74 nop-instructions nop nop nop nop nop nop nop nop nop nop @10 nop nop nop nop nop nop nop nop nop nop @20 nop nop nop nop nop nop nop nop nop nop @30 nop nop nop nop nop nop nop nop nop nop @40 nop nop nop nop nop nop nop nop nop nop @50 nop nop nop nop nop nop nop nop nop nop @60 nop nop nop nop nop nop nop nop nop nop @70 nop nop nop nop @74 /* * omap1610_cpu_suspend()'s resume point. * * It will just start executing here, so we'll restore stuff from the * stack. */ @ Restore the ARM_IDLECT1 and ARM_IDLECT2. strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] @ Restore EMIFF controls str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff] @ Restore regs and return ldmfd sp!, {r0 - r12, pc} ENTRY(omap1610_cpu_suspend_sz) .word . - omap1610_cpu_suspend #endif /* CONFIG_ARCH_OMAP16XX */