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b6338bdc83
The new fncpy API is better suited* for copying some
code to SRAM at runtime. This patch changes the ad-hoc
code to the more generic fncpy API.
*: 1. fncpy ensures that the thumb mode bit is propagated,
2. fncpy provides the security of type safety between the
original function and the sram function pointer.
Tested OK on OMAP3 in low power modes (RET/OFF)
using omap2plus_defconfig with !CONFIG_THUMB2_KERNEL.
Compile tested on OMAP1/2 using omap1_defconfig.
Boot tested on OMAP1 & OMAP2
Tested OK with suspend/resume on OMAP2420/n810
Boots fine on osk5912 and n800
Signed-off-by: Jean Pihet <j-pihet@ti.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Kevin Hilman <khilman@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
367 lines
9.1 KiB
ArmAsm
367 lines
9.1 KiB
ArmAsm
/*
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* linux/arch/arm/mach-omap1/sleep.S
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*
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* Low-level OMAP7XX/1510/1610 sleep/wakeUp support
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*
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* Initial SA1110 code:
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
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*
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* Adapted for PXA by Nicolas Pitre:
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* Copyright (c) 2002 Monta Vista Software, Inc.
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*
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* Support for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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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 <mach/io.h>
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#include "pm.h"
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.text
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/*
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* Forces OMAP into deep sleep state
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*
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* omapXXXX_cpu_suspend()
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*
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* The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed
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* as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1
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* in register r1.
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*
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* Note: This code get's copied to internal SRAM at boot. When the OMAP
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* wakes up it continues execution at the point it went to sleep.
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*
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* Note: Because of errata work arounds we have processor specific functions
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* here. They are mostly the same, but slightly different.
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*
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*/
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#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
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.align 3
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ENTRY(omap7xx_cpu_suspend)
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@ save registers on stack
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stmfd sp!, {r0 - r12, lr}
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@ Drain write cache
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mov r4, #0
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mcr p15, 0, r0, c7, c10, 4
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nop
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@ load base address of Traffic Controller
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mov r6, #TCMIF_ASM_BASE & 0xff000000
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orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
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orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
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@ prepare to put SDRAM into self-refresh manually
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ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
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orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
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str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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@ prepare to put EMIFS to Sleep
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ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
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str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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@ load base address of ARM_IDLECT1 and ARM_IDLECT2
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mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
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orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
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orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
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@ turn off clock domains
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@ do not disable PERCK (0x04)
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mov r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff
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orr r5, r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff00
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strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
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@ request ARM idle
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mov r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff
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orr r3, r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff00
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strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
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@ disable instruction cache
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mrc p15, 0, r9, c1, c0, 0
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bic r2, r9, #0x1000
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mcr p15, 0, r2, c1, c0, 0
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nop
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/*
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* Let's wait for the next wake up event to wake us up. r0 can't be
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* used here because r0 holds ARM_IDLECT1
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*/
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mov r2, #0
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mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
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/*
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* omap7xx_cpu_suspend()'s resume point.
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*
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* It will just start executing here, so we'll restore stuff from the
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* stack.
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*/
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@ re-enable Icache
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mcr p15, 0, r9, c1, c0, 0
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@ reset the ARM_IDLECT1 and ARM_IDLECT2.
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strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
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strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
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@ Restore EMIFF controls
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str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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@ restore regs and return
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ldmfd sp!, {r0 - r12, pc}
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ENTRY(omap7xx_cpu_suspend_sz)
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.word . - omap7xx_cpu_suspend
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#endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */
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#ifdef CONFIG_ARCH_OMAP15XX
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.align 3
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ENTRY(omap1510_cpu_suspend)
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@ save registers on stack
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stmfd sp!, {r0 - r12, lr}
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@ load base address of Traffic Controller
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mov r4, #TCMIF_ASM_BASE & 0xff000000
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orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
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orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
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@ work around errata of OMAP1510 PDE bit for TC shut down
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@ clear PDE bit
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ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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bic r5, r5, #PDE_BIT & 0xff
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str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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@ set PWD_EN bit
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and r5, r5, #PWD_EN_BIT & 0xff
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str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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@ prepare to put SDRAM into self-refresh manually
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ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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orr r5, r5, #SELF_REFRESH_MODE & 0xff000000
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orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff
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str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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@ prepare to put EMIFS to Sleep
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ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff
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str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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@ load base address of ARM_IDLECT1 and ARM_IDLECT2
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mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
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orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
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orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
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@ turn off clock domains
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mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
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orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
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strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
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@ request ARM idle
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mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
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orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
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strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
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mov r5, #IDLE_WAIT_CYCLES & 0xff
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orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
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l_1510_2:
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subs r5, r5, #1
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bne l_1510_2
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/*
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* Let's wait for the next wake up event to wake us up. r0 can't be
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* used here because r0 holds ARM_IDLECT1
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*/
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mov r2, #0
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mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
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/*
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* omap1510_cpu_suspend()'s resume point.
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*
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* It will just start executing here, so we'll restore stuff from the
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* stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
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*/
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strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
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strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
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@ restore regs and return
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ldmfd sp!, {r0 - r12, pc}
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ENTRY(omap1510_cpu_suspend_sz)
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.word . - omap1510_cpu_suspend
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#endif /* CONFIG_ARCH_OMAP15XX */
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#if defined(CONFIG_ARCH_OMAP16XX)
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.align 3
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ENTRY(omap1610_cpu_suspend)
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@ save registers on stack
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stmfd sp!, {r0 - r12, lr}
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@ Drain write cache
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mov r4, #0
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mcr p15, 0, r0, c7, c10, 4
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nop
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@ Load base address of Traffic Controller
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mov r6, #TCMIF_ASM_BASE & 0xff000000
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orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
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orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
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@ Prepare to put SDRAM into self-refresh manually
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ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
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orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
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str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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@ Prepare to put EMIFS to Sleep
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ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
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str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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@ Load base address of ARM_IDLECT1 and ARM_IDLECT2
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mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
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orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
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orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
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@ Turn off clock domains
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@ Do not disable PERCK (0x04)
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mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
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orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
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strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
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@ Request ARM idle
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mov r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
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orr r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
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strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
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/*
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* Let's wait for the next wake up event to wake us up. r0 can't be
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* used here because r0 holds ARM_IDLECT1
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*/
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mov r2, #0
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mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
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@ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
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@ according to this formula:
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@ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
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@ Max DPLL_MULT = 18
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@ DPLL_DIV = 1
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@ ARMDIV = 1
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@ => 74 nop-instructions
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop @10
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop @20
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop @30
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop @40
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop @50
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop @60
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop @70
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nop
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nop
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nop
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nop @74
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/*
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* omap1610_cpu_suspend()'s resume point.
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*
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* It will just start executing here, so we'll restore stuff from the
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* stack.
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*/
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@ Restore the ARM_IDLECT1 and ARM_IDLECT2.
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strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
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strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
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@ Restore EMIFF controls
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str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
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str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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@ Restore regs and return
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ldmfd sp!, {r0 - r12, pc}
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ENTRY(omap1610_cpu_suspend_sz)
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.word . - omap1610_cpu_suspend
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#endif /* CONFIG_ARCH_OMAP16XX */
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