857c1b81f8
The ABI allows called functions to corrupt r0-r3 and ip (r12). So its pointless saving these registers in the suspend code - the calling function will expect them to be corrupted and so won't rely on their contents after resume. Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-by: Kevin Hilman <khilman@ti.com> Acked-by: Jean Pihet <j-pihet@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
755 lines
20 KiB
ArmAsm
755 lines
20 KiB
ArmAsm
/*
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* (C) Copyright 2007
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* Texas Instruments
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* Karthik Dasu <karthik-dp@ti.com>
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*
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* (C) Copyright 2004
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* Texas Instruments, <www.ti.com>
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* Richard Woodruff <r-woodruff2@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 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 <plat/sram.h>
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#include <mach/io.h>
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#include "cm2xxx_3xxx.h"
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#include "prm2xxx_3xxx.h"
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#include "sdrc.h"
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#include "control.h"
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/*
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* Registers access definitions
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*/
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#define SDRC_SCRATCHPAD_SEM_OFFS 0xc
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#define SDRC_SCRATCHPAD_SEM_V OMAP343X_SCRATCHPAD_REGADDR\
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(SDRC_SCRATCHPAD_SEM_OFFS)
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#define PM_PREPWSTST_CORE_P OMAP3430_PRM_BASE + CORE_MOD +\
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OMAP3430_PM_PREPWSTST
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#define PM_PWSTCTRL_MPU_P OMAP3430_PRM_BASE + MPU_MOD + OMAP2_PM_PWSTCTRL
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#define CM_IDLEST1_CORE_V OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST1)
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#define CM_IDLEST_CKGEN_V OMAP34XX_CM_REGADDR(PLL_MOD, CM_IDLEST)
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#define SRAM_BASE_P OMAP3_SRAM_PA
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#define CONTROL_STAT OMAP343X_CTRL_BASE + OMAP343X_CONTROL_STATUS
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#define CONTROL_MEM_RTA_CTRL (OMAP343X_CTRL_BASE +\
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OMAP36XX_CONTROL_MEM_RTA_CTRL)
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/* Move this as correct place is available */
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#define SCRATCHPAD_MEM_OFFS 0x310
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#define SCRATCHPAD_BASE_P (OMAP343X_CTRL_BASE +\
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OMAP343X_CONTROL_MEM_WKUP +\
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SCRATCHPAD_MEM_OFFS)
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#define SDRC_POWER_V OMAP34XX_SDRC_REGADDR(SDRC_POWER)
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#define SDRC_SYSCONFIG_P (OMAP343X_SDRC_BASE + SDRC_SYSCONFIG)
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#define SDRC_MR_0_P (OMAP343X_SDRC_BASE + SDRC_MR_0)
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#define SDRC_EMR2_0_P (OMAP343X_SDRC_BASE + SDRC_EMR2_0)
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#define SDRC_MANUAL_0_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_0)
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#define SDRC_MR_1_P (OMAP343X_SDRC_BASE + SDRC_MR_1)
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#define SDRC_EMR2_1_P (OMAP343X_SDRC_BASE + SDRC_EMR2_1)
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#define SDRC_MANUAL_1_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_1)
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#define SDRC_DLLA_STATUS_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS)
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#define SDRC_DLLA_CTRL_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL)
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/*
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* This file needs be built unconditionally as ARM to interoperate correctly
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* with non-Thumb-2-capable firmware.
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*/
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.arm
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/*
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* API functions
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*/
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/*
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* The "get_*restore_pointer" functions are used to provide a
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* physical restore address where the ROM code jumps while waking
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* up from MPU OFF/OSWR state.
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* The restore pointer is stored into the scratchpad.
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*/
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.text
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/* Function call to get the restore pointer for resume from OFF */
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ENTRY(get_restore_pointer)
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stmfd sp!, {lr} @ save registers on stack
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adr r0, restore
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ldmfd sp!, {pc} @ restore regs and return
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ENDPROC(get_restore_pointer)
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.align
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ENTRY(get_restore_pointer_sz)
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.word . - get_restore_pointer
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.text
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/* Function call to get the restore pointer for 3630 resume from OFF */
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ENTRY(get_omap3630_restore_pointer)
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stmfd sp!, {lr} @ save registers on stack
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adr r0, restore_3630
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ldmfd sp!, {pc} @ restore regs and return
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ENDPROC(get_omap3630_restore_pointer)
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.align
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ENTRY(get_omap3630_restore_pointer_sz)
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.word . - get_omap3630_restore_pointer
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.text
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/* Function call to get the restore pointer for ES3 to resume from OFF */
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ENTRY(get_es3_restore_pointer)
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stmfd sp!, {lr} @ save registers on stack
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adr r0, restore_es3
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ldmfd sp!, {pc} @ restore regs and return
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ENDPROC(get_es3_restore_pointer)
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.align
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ENTRY(get_es3_restore_pointer_sz)
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.word . - get_es3_restore_pointer
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.text
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/*
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* L2 cache needs to be toggled for stable OFF mode functionality on 3630.
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* This function sets up a flag that will allow for this toggling to take
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* place on 3630. Hopefully some version in the future may not need this.
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*/
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ENTRY(enable_omap3630_toggle_l2_on_restore)
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stmfd sp!, {lr} @ save registers on stack
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/* Setup so that we will disable and enable l2 */
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mov r1, #0x1
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adrl r2, l2dis_3630 @ may be too distant for plain adr
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str r1, [r2]
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ldmfd sp!, {pc} @ restore regs and return
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ENDPROC(enable_omap3630_toggle_l2_on_restore)
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.text
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/* Function to call rom code to save secure ram context */
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.align 3
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ENTRY(save_secure_ram_context)
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stmfd sp!, {r4 - r11, lr} @ save registers on stack
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adr r3, api_params @ r3 points to parameters
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str r0, [r3,#0x4] @ r0 has sdram address
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ldr r12, high_mask
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and r3, r3, r12
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ldr r12, sram_phy_addr_mask
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orr r3, r3, r12
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mov r0, #25 @ set service ID for PPA
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mov r12, r0 @ copy secure service ID in r12
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mov r1, #0 @ set task id for ROM code in r1
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mov r2, #4 @ set some flags in r2, r6
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mov r6, #0xff
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dsb @ data write barrier
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dmb @ data memory barrier
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smc #1 @ call SMI monitor (smi #1)
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nop
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nop
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nop
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nop
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ldmfd sp!, {r4 - r11, pc}
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.align
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sram_phy_addr_mask:
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.word SRAM_BASE_P
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high_mask:
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.word 0xffff
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api_params:
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.word 0x4, 0x0, 0x0, 0x1, 0x1
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ENDPROC(save_secure_ram_context)
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ENTRY(save_secure_ram_context_sz)
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.word . - save_secure_ram_context
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/*
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* ======================
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* == Idle entry point ==
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* ======================
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*/
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/*
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* Forces OMAP into idle state
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*
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* omap34xx_cpu_suspend() - This bit of code saves the CPU context if needed
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* and executes the WFI instruction. Calling WFI effectively changes the
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* power domains states to the desired target power states.
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*
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*
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* Notes:
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* - this code gets copied to internal SRAM at boot and after wake-up
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* from OFF mode. The execution pointer in SRAM is _omap_sram_idle.
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* - when the OMAP wakes up it continues at different execution points
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* depending on the low power mode (non-OFF vs OFF modes),
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* cf. 'Resume path for xxx mode' comments.
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*/
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.align 3
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ENTRY(omap34xx_cpu_suspend)
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stmfd sp!, {r4 - r11, lr} @ save registers on stack
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/*
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* r0 contains CPU context save/restore pointer in sdram
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* r1 contains information about saving context:
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* 0 - No context lost
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* 1 - Only L1 and logic lost
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* 2 - Only L2 lost (Even L1 is retained we clean it along with L2)
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* 3 - Both L1 and L2 lost and logic lost
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*/
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/* Directly jump to WFI is the context save is not required */
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cmp r1, #0x0
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beq omap3_do_wfi
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/* Otherwise fall through to the save context code */
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save_context_wfi:
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mov r8, r0 @ Store SDRAM address in r8
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mrc p15, 0, r5, c1, c0, 1 @ Read Auxiliary Control Register
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mov r4, #0x1 @ Number of parameters for restore call
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stmia r8!, {r4-r5} @ Push parameters for restore call
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mrc p15, 1, r5, c9, c0, 2 @ Read L2 AUX ctrl register
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stmia r8!, {r4-r5} @ Push parameters for restore call
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/* Check what that target sleep state is from r1 */
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cmp r1, #0x2 @ Only L2 lost, no need to save context
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beq clean_caches
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l1_logic_lost:
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mov r4, sp @ Store sp
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mrs r5, spsr @ Store spsr
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mov r6, lr @ Store lr
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stmia r8!, {r4-r6}
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mrc p15, 0, r4, c1, c0, 2 @ Coprocessor access control register
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mrc p15, 0, r5, c2, c0, 0 @ TTBR0
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mrc p15, 0, r6, c2, c0, 1 @ TTBR1
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mrc p15, 0, r7, c2, c0, 2 @ TTBCR
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stmia r8!, {r4-r7}
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mrc p15, 0, r4, c3, c0, 0 @ Domain access Control Register
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mrc p15, 0, r5, c10, c2, 0 @ PRRR
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mrc p15, 0, r6, c10, c2, 1 @ NMRR
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stmia r8!,{r4-r6}
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mrc p15, 0, r4, c13, c0, 1 @ Context ID
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mrc p15, 0, r5, c13, c0, 2 @ User r/w thread and process ID
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mrc p15, 0, r6, c12, c0, 0 @ Secure or NS vector base address
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mrs r7, cpsr @ Store current cpsr
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stmia r8!, {r4-r7}
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mrc p15, 0, r4, c1, c0, 0 @ save control register
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stmia r8!, {r4}
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clean_caches:
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/*
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* jump out to kernel flush routine
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* - reuse that code is better
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* - it executes in a cached space so is faster than refetch per-block
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* - should be faster and will change with kernel
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* - 'might' have to copy address, load and jump to it
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* Flush all data from the L1 data cache before disabling
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* SCTLR.C bit.
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*/
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ldr r1, kernel_flush
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mov lr, pc
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bx r1
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/*
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* Clear the SCTLR.C bit to prevent further data cache
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* allocation. Clearing SCTLR.C would make all the data accesses
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* strongly ordered and would not hit the cache.
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*/
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mrc p15, 0, r0, c1, c0, 0
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bic r0, r0, #(1 << 2) @ Disable the C bit
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mcr p15, 0, r0, c1, c0, 0
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isb
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/*
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* Invalidate L1 data cache. Even though only invalidate is
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* necessary exported flush API is used here. Doing clean
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* on already clean cache would be almost NOP.
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*/
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ldr r1, kernel_flush
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blx r1
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/*
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* The kernel doesn't interwork: v7_flush_dcache_all in particluar will
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* always return in Thumb state when CONFIG_THUMB2_KERNEL is enabled.
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* This sequence switches back to ARM. Note that .align may insert a
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* nop: bx pc needs to be word-aligned in order to work.
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*/
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THUMB( .thumb )
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THUMB( .align )
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THUMB( bx pc )
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THUMB( nop )
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.arm
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omap3_do_wfi:
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ldr r4, sdrc_power @ read the SDRC_POWER register
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ldr r5, [r4] @ read the contents of SDRC_POWER
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orr r5, r5, #0x40 @ enable self refresh on idle req
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str r5, [r4] @ write back to SDRC_POWER register
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/* Data memory barrier and Data sync barrier */
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dsb
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dmb
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/*
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* ===================================
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* == WFI instruction => Enter idle ==
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* ===================================
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*/
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wfi @ wait for interrupt
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/*
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* ===================================
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* == Resume path for non-OFF modes ==
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* ===================================
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*/
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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
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bl wait_sdrc_ok
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mrc p15, 0, r0, c1, c0, 0
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tst r0, #(1 << 2) @ Check C bit enabled?
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orreq r0, r0, #(1 << 2) @ Enable the C bit if cleared
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mcreq p15, 0, r0, c1, c0, 0
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isb
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/*
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* ===================================
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* == Exit point from non-OFF modes ==
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* ===================================
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*/
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ldmfd sp!, {r4 - r11, pc} @ restore regs and return
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/*
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* ==============================
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* == Resume path for OFF mode ==
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* ==============================
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*/
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/*
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* The restore_* functions are called by the ROM code
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* when back from WFI in OFF mode.
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* Cf. the get_*restore_pointer functions.
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*
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* restore_es3: applies to 34xx >= ES3.0
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* restore_3630: applies to 36xx
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* restore: common code for 3xxx
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*/
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restore_es3:
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ldr r5, pm_prepwstst_core_p
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ldr r4, [r5]
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and r4, r4, #0x3
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cmp r4, #0x0 @ Check if previous power state of CORE is OFF
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bne restore
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adr r0, es3_sdrc_fix
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ldr r1, sram_base
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ldr r2, es3_sdrc_fix_sz
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mov r2, r2, ror #2
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copy_to_sram:
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ldmia r0!, {r3} @ val = *src
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stmia r1!, {r3} @ *dst = val
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subs r2, r2, #0x1 @ num_words--
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bne copy_to_sram
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ldr r1, sram_base
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blx r1
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b restore
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restore_3630:
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ldr r1, pm_prepwstst_core_p
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ldr r2, [r1]
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and r2, r2, #0x3
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cmp r2, #0x0 @ Check if previous power state of CORE is OFF
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bne restore
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/* Disable RTA before giving control */
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ldr r1, control_mem_rta
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mov r2, #OMAP36XX_RTA_DISABLE
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str r2, [r1]
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/* Fall through to common code for the remaining logic */
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restore:
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/*
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* Check what was the reason for mpu reset and store the reason in r9:
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* 0 - No context lost
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* 1 - Only L1 and logic lost
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* 2 - Only L2 lost - In this case, we wont be here
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* 3 - Both L1 and L2 lost
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*/
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ldr r1, pm_pwstctrl_mpu
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ldr r2, [r1]
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and r2, r2, #0x3
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cmp r2, #0x0 @ Check if target power state was OFF or RET
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moveq r9, #0x3 @ MPU OFF => L1 and L2 lost
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movne r9, #0x1 @ Only L1 and L2 lost => avoid L2 invalidation
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bne logic_l1_restore
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ldr r0, l2dis_3630
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cmp r0, #0x1 @ should we disable L2 on 3630?
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bne skipl2dis
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mrc p15, 0, r0, c1, c0, 1
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bic r0, r0, #2 @ disable L2 cache
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mcr p15, 0, r0, c1, c0, 1
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skipl2dis:
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ldr r0, control_stat
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ldr r1, [r0]
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and r1, #0x700
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cmp r1, #0x300
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beq l2_inv_gp
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mov r0, #40 @ set service ID for PPA
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mov r12, r0 @ copy secure Service ID in r12
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mov r1, #0 @ set task id for ROM code in r1
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mov r2, #4 @ set some flags in r2, r6
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mov r6, #0xff
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adr r3, l2_inv_api_params @ r3 points to dummy parameters
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dsb @ data write barrier
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dmb @ data memory barrier
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smc #1 @ call SMI monitor (smi #1)
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/* Write to Aux control register to set some bits */
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mov r0, #42 @ set service ID for PPA
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mov r12, r0 @ copy secure Service ID in r12
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mov r1, #0 @ set task id for ROM code in r1
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mov r2, #4 @ set some flags in r2, r6
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mov r6, #0xff
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ldr r4, scratchpad_base
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ldr r3, [r4, #0xBC] @ r3 points to parameters
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dsb @ data write barrier
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dmb @ data memory barrier
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smc #1 @ call SMI monitor (smi #1)
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#ifdef CONFIG_OMAP3_L2_AUX_SECURE_SAVE_RESTORE
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/* Restore L2 aux control register */
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@ set service ID for PPA
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mov r0, #CONFIG_OMAP3_L2_AUX_SECURE_SERVICE_SET_ID
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mov r12, r0 @ copy service ID in r12
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mov r1, #0 @ set task ID for ROM code in r1
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mov r2, #4 @ set some flags in r2, r6
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mov r6, #0xff
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ldr r4, scratchpad_base
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ldr r3, [r4, #0xBC]
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adds r3, r3, #8 @ r3 points to parameters
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dsb @ data write barrier
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dmb @ data memory barrier
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smc #1 @ call SMI monitor (smi #1)
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#endif
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b logic_l1_restore
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.align
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l2_inv_api_params:
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.word 0x1, 0x00
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l2_inv_gp:
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/* Execute smi to invalidate L2 cache */
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mov r12, #0x1 @ set up to invalidate L2
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smc #0 @ Call SMI monitor (smieq)
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/* Write to Aux control register to set some bits */
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ldr r4, scratchpad_base
|
|
ldr r3, [r4,#0xBC]
|
|
ldr r0, [r3,#4]
|
|
mov r12, #0x3
|
|
smc #0 @ Call SMI monitor (smieq)
|
|
ldr r4, scratchpad_base
|
|
ldr r3, [r4,#0xBC]
|
|
ldr r0, [r3,#12]
|
|
mov r12, #0x2
|
|
smc #0 @ Call SMI monitor (smieq)
|
|
logic_l1_restore:
|
|
ldr r1, l2dis_3630
|
|
cmp r1, #0x1 @ Test if L2 re-enable needed on 3630
|
|
bne skipl2reen
|
|
mrc p15, 0, r1, c1, c0, 1
|
|
orr r1, r1, #2 @ re-enable L2 cache
|
|
mcr p15, 0, r1, c1, c0, 1
|
|
skipl2reen:
|
|
mov r1, #0
|
|
/*
|
|
* Invalidate all instruction caches to PoU
|
|
* and flush branch target cache
|
|
*/
|
|
mcr p15, 0, r1, c7, c5, 0
|
|
|
|
ldr r4, scratchpad_base
|
|
ldr r3, [r4,#0xBC]
|
|
adds r3, r3, #16
|
|
|
|
ldmia r3!, {r4-r6}
|
|
mov sp, r4 @ Restore sp
|
|
msr spsr_cxsf, r5 @ Restore spsr
|
|
mov lr, r6 @ Restore lr
|
|
|
|
ldmia r3!, {r4-r7}
|
|
mcr p15, 0, r4, c1, c0, 2 @ Coprocessor access Control Register
|
|
mcr p15, 0, r5, c2, c0, 0 @ TTBR0
|
|
mcr p15, 0, r6, c2, c0, 1 @ TTBR1
|
|
mcr p15, 0, r7, c2, c0, 2 @ TTBCR
|
|
|
|
ldmia r3!,{r4-r6}
|
|
mcr p15, 0, r4, c3, c0, 0 @ Domain access Control Register
|
|
mcr p15, 0, r5, c10, c2, 0 @ PRRR
|
|
mcr p15, 0, r6, c10, c2, 1 @ NMRR
|
|
|
|
|
|
ldmia r3!,{r4-r7}
|
|
mcr p15, 0, r4, c13, c0, 1 @ Context ID
|
|
mcr p15, 0, r5, c13, c0, 2 @ User r/w thread and process ID
|
|
mrc p15, 0, r6, c12, c0, 0 @ Secure or NS vector base address
|
|
msr cpsr, r7 @ store cpsr
|
|
|
|
/* Enabling MMU here */
|
|
mrc p15, 0, r7, c2, c0, 2 @ Read TTBRControl
|
|
/* Extract N (0:2) bits and decide whether to use TTBR0 or TTBR1 */
|
|
and r7, #0x7
|
|
cmp r7, #0x0
|
|
beq usettbr0
|
|
ttbr_error:
|
|
/*
|
|
* More work needs to be done to support N[0:2] value other than 0
|
|
* So looping here so that the error can be detected
|
|
*/
|
|
b ttbr_error
|
|
usettbr0:
|
|
mrc p15, 0, r2, c2, c0, 0
|
|
ldr r5, ttbrbit_mask
|
|
and r2, r5
|
|
mov r4, pc
|
|
ldr r5, table_index_mask
|
|
and r4, r5 @ r4 = 31 to 20 bits of pc
|
|
/* Extract the value to be written to table entry */
|
|
ldr r1, table_entry
|
|
/* r1 has the value to be written to table entry*/
|
|
add r1, r1, r4
|
|
/* Getting the address of table entry to modify */
|
|
lsr r4, #18
|
|
/* r2 has the location which needs to be modified */
|
|
add r2, r4
|
|
/* Storing previous entry of location being modified */
|
|
ldr r5, scratchpad_base
|
|
ldr r4, [r2]
|
|
str r4, [r5, #0xC0]
|
|
/* Modify the table entry */
|
|
str r1, [r2]
|
|
/*
|
|
* Storing address of entry being modified
|
|
* - will be restored after enabling MMU
|
|
*/
|
|
ldr r5, scratchpad_base
|
|
str r2, [r5, #0xC4]
|
|
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c5, 4 @ Flush prefetch buffer
|
|
mcr p15, 0, r0, c7, c5, 6 @ Invalidate branch predictor array
|
|
mcr p15, 0, r0, c8, c5, 0 @ Invalidate instruction TLB
|
|
mcr p15, 0, r0, c8, c6, 0 @ Invalidate data TLB
|
|
/*
|
|
* Restore control register. This enables the MMU.
|
|
* The caches and prediction are not enabled here, they
|
|
* will be enabled after restoring the MMU table entry.
|
|
*/
|
|
ldmia r3!, {r4}
|
|
/* Store previous value of control register in scratchpad */
|
|
str r4, [r5, #0xC8]
|
|
ldr r2, cache_pred_disable_mask
|
|
and r4, r2
|
|
mcr p15, 0, r4, c1, c0, 0
|
|
dsb
|
|
isb
|
|
ldr r0, =restoremmu_on
|
|
bx r0
|
|
|
|
/*
|
|
* ==============================
|
|
* == Exit point from OFF mode ==
|
|
* ==============================
|
|
*/
|
|
restoremmu_on:
|
|
ldmfd sp!, {r4 - r11, pc} @ restore regs and return
|
|
|
|
|
|
/*
|
|
* Internal functions
|
|
*/
|
|
|
|
/* This function implements the erratum ID i443 WA, applies to 34xx >= ES3.0 */
|
|
.text
|
|
.align 3
|
|
ENTRY(es3_sdrc_fix)
|
|
ldr r4, sdrc_syscfg @ get config addr
|
|
ldr r5, [r4] @ get value
|
|
tst r5, #0x100 @ is part access blocked
|
|
it eq
|
|
biceq r5, r5, #0x100 @ clear bit if set
|
|
str r5, [r4] @ write back change
|
|
ldr r4, sdrc_mr_0 @ get config addr
|
|
ldr r5, [r4] @ get value
|
|
str r5, [r4] @ write back change
|
|
ldr r4, sdrc_emr2_0 @ get config addr
|
|
ldr r5, [r4] @ get value
|
|
str r5, [r4] @ write back change
|
|
ldr r4, sdrc_manual_0 @ get config addr
|
|
mov r5, #0x2 @ autorefresh command
|
|
str r5, [r4] @ kick off refreshes
|
|
ldr r4, sdrc_mr_1 @ get config addr
|
|
ldr r5, [r4] @ get value
|
|
str r5, [r4] @ write back change
|
|
ldr r4, sdrc_emr2_1 @ get config addr
|
|
ldr r5, [r4] @ get value
|
|
str r5, [r4] @ write back change
|
|
ldr r4, sdrc_manual_1 @ get config addr
|
|
mov r5, #0x2 @ autorefresh command
|
|
str r5, [r4] @ kick off refreshes
|
|
bx lr
|
|
|
|
.align
|
|
sdrc_syscfg:
|
|
.word SDRC_SYSCONFIG_P
|
|
sdrc_mr_0:
|
|
.word SDRC_MR_0_P
|
|
sdrc_emr2_0:
|
|
.word SDRC_EMR2_0_P
|
|
sdrc_manual_0:
|
|
.word SDRC_MANUAL_0_P
|
|
sdrc_mr_1:
|
|
.word SDRC_MR_1_P
|
|
sdrc_emr2_1:
|
|
.word SDRC_EMR2_1_P
|
|
sdrc_manual_1:
|
|
.word SDRC_MANUAL_1_P
|
|
ENDPROC(es3_sdrc_fix)
|
|
ENTRY(es3_sdrc_fix_sz)
|
|
.word . - es3_sdrc_fix
|
|
|
|
/*
|
|
* This function implements the erratum ID i581 WA:
|
|
* SDRC state restore before accessing the SDRAM
|
|
*
|
|
* Only used at return from non-OFF mode. For OFF
|
|
* mode the ROM code configures the SDRC and
|
|
* the DPLL before calling the restore code directly
|
|
* from DDR.
|
|
*/
|
|
|
|
/* Make sure SDRC accesses are ok */
|
|
wait_sdrc_ok:
|
|
|
|
/* DPLL3 must be locked before accessing the SDRC. Maybe the HW ensures this */
|
|
ldr r4, cm_idlest_ckgen
|
|
wait_dpll3_lock:
|
|
ldr r5, [r4]
|
|
tst r5, #1
|
|
beq wait_dpll3_lock
|
|
|
|
ldr r4, cm_idlest1_core
|
|
wait_sdrc_ready:
|
|
ldr r5, [r4]
|
|
tst r5, #0x2
|
|
bne wait_sdrc_ready
|
|
/* allow DLL powerdown upon hw idle req */
|
|
ldr r4, sdrc_power
|
|
ldr r5, [r4]
|
|
bic r5, r5, #0x40
|
|
str r5, [r4]
|
|
|
|
/*
|
|
* PC-relative stores lead to undefined behaviour in Thumb-2: use a r7 as a
|
|
* base instead.
|
|
* Be careful not to clobber r7 when maintaing this code.
|
|
*/
|
|
|
|
is_dll_in_lock_mode:
|
|
/* Is dll in lock mode? */
|
|
ldr r4, sdrc_dlla_ctrl
|
|
ldr r5, [r4]
|
|
tst r5, #0x4
|
|
bxne lr @ Return if locked
|
|
/* wait till dll locks */
|
|
adr r7, kick_counter
|
|
wait_dll_lock_timed:
|
|
ldr r4, wait_dll_lock_counter
|
|
add r4, r4, #1
|
|
str r4, [r7, #wait_dll_lock_counter - kick_counter]
|
|
ldr r4, sdrc_dlla_status
|
|
/* Wait 20uS for lock */
|
|
mov r6, #8
|
|
wait_dll_lock:
|
|
subs r6, r6, #0x1
|
|
beq kick_dll
|
|
ldr r5, [r4]
|
|
and r5, r5, #0x4
|
|
cmp r5, #0x4
|
|
bne wait_dll_lock
|
|
bx lr @ Return when locked
|
|
|
|
/* disable/reenable DLL if not locked */
|
|
kick_dll:
|
|
ldr r4, sdrc_dlla_ctrl
|
|
ldr r5, [r4]
|
|
mov r6, r5
|
|
bic r6, #(1<<3) @ disable dll
|
|
str r6, [r4]
|
|
dsb
|
|
orr r6, r6, #(1<<3) @ enable dll
|
|
str r6, [r4]
|
|
dsb
|
|
ldr r4, kick_counter
|
|
add r4, r4, #1
|
|
str r4, [r7] @ kick_counter
|
|
b wait_dll_lock_timed
|
|
|
|
.align
|
|
cm_idlest1_core:
|
|
.word CM_IDLEST1_CORE_V
|
|
cm_idlest_ckgen:
|
|
.word CM_IDLEST_CKGEN_V
|
|
sdrc_dlla_status:
|
|
.word SDRC_DLLA_STATUS_V
|
|
sdrc_dlla_ctrl:
|
|
.word SDRC_DLLA_CTRL_V
|
|
pm_prepwstst_core_p:
|
|
.word PM_PREPWSTST_CORE_P
|
|
pm_pwstctrl_mpu:
|
|
.word PM_PWSTCTRL_MPU_P
|
|
scratchpad_base:
|
|
.word SCRATCHPAD_BASE_P
|
|
sram_base:
|
|
.word SRAM_BASE_P + 0x8000
|
|
sdrc_power:
|
|
.word SDRC_POWER_V
|
|
ttbrbit_mask:
|
|
.word 0xFFFFC000
|
|
table_index_mask:
|
|
.word 0xFFF00000
|
|
table_entry:
|
|
.word 0x00000C02
|
|
cache_pred_disable_mask:
|
|
.word 0xFFFFE7FB
|
|
control_stat:
|
|
.word CONTROL_STAT
|
|
control_mem_rta:
|
|
.word CONTROL_MEM_RTA_CTRL
|
|
kernel_flush:
|
|
.word v7_flush_dcache_all
|
|
l2dis_3630:
|
|
.word 0
|
|
/*
|
|
* When exporting to userspace while the counters are in SRAM,
|
|
* these 2 words need to be at the end to facilitate retrival!
|
|
*/
|
|
kick_counter:
|
|
.word 0
|
|
wait_dll_lock_counter:
|
|
.word 0
|
|
ENDPROC(omap34xx_cpu_suspend)
|
|
|
|
ENTRY(omap34xx_cpu_suspend_sz)
|
|
.word . - omap34xx_cpu_suspend
|