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linux-next/arch/arm/mach-omap2/sleep34xx.S
Tony Lindgren 2c799cef4d ARM: OMAP: Remove plat/io.h by splitting it into mach/io.h and mach/hardware.h 
This is needed to minimize io.h so the SoC specific io.h
for ARMs can removed.

Note that minimal driver changes for DSS and RNG are needed to
include cpu.h for SoC detection macros.

Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2012-02-24 10:34:35 -08:00

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/*
* (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 <asm/assembler.h>
#include <plat/hardware.h>
#include <plat/sram.h>
#include "iomap.h"
#include "cm2xxx_3xxx.h"
#include "prm2xxx_3xxx.h"
#include "sdrc.h"
#include "control.h"
/*
* Registers access definitions
*/
#define SDRC_SCRATCHPAD_SEM_OFFS 0xc
#define SDRC_SCRATCHPAD_SEM_V OMAP343X_SCRATCHPAD_REGADDR\
(SDRC_SCRATCHPAD_SEM_OFFS)
#define PM_PREPWSTST_CORE_P OMAP3430_PRM_BASE + CORE_MOD +\
OMAP3430_PM_PREPWSTST
#define PM_PWSTCTRL_MPU_P OMAP3430_PRM_BASE + MPU_MOD + OMAP2_PM_PWSTCTRL
#define CM_IDLEST1_CORE_V OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST1)
#define CM_IDLEST_CKGEN_V OMAP34XX_CM_REGADDR(PLL_MOD, CM_IDLEST)
#define SRAM_BASE_P OMAP3_SRAM_PA
#define CONTROL_STAT OMAP343X_CTRL_BASE + OMAP343X_CONTROL_STATUS
#define CONTROL_MEM_RTA_CTRL (OMAP343X_CTRL_BASE +\
OMAP36XX_CONTROL_MEM_RTA_CTRL)
/* Move this as correct place is available */
#define SCRATCHPAD_MEM_OFFS 0x310
#define SCRATCHPAD_BASE_P (OMAP343X_CTRL_BASE +\
OMAP343X_CONTROL_MEM_WKUP +\
SCRATCHPAD_MEM_OFFS)
#define SDRC_POWER_V OMAP34XX_SDRC_REGADDR(SDRC_POWER)
#define SDRC_SYSCONFIG_P (OMAP343X_SDRC_BASE + SDRC_SYSCONFIG)
#define SDRC_MR_0_P (OMAP343X_SDRC_BASE + SDRC_MR_0)
#define SDRC_EMR2_0_P (OMAP343X_SDRC_BASE + SDRC_EMR2_0)
#define SDRC_MANUAL_0_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_0)
#define SDRC_MR_1_P (OMAP343X_SDRC_BASE + SDRC_MR_1)
#define SDRC_EMR2_1_P (OMAP343X_SDRC_BASE + SDRC_EMR2_1)
#define SDRC_MANUAL_1_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_1)
#define SDRC_DLLA_STATUS_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS)
#define SDRC_DLLA_CTRL_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL)
/*
* This file needs be built unconditionally as ARM to interoperate correctly
* with non-Thumb-2-capable firmware.
*/
.arm
/*
* API functions
*/
.text
/*
* L2 cache needs to be toggled for stable OFF mode functionality on 3630.
* This function sets up a flag that will allow for this toggling to take
* place on 3630. Hopefully some version in the future may not need this.
*/
ENTRY(enable_omap3630_toggle_l2_on_restore)
stmfd sp!, {lr} @ save registers on stack
/* Setup so that we will disable and enable l2 */
mov r1, #0x1
adrl r2, l2dis_3630 @ may be too distant for plain adr
str r1, [r2]
ldmfd sp!, {pc} @ restore regs and return
ENDPROC(enable_omap3630_toggle_l2_on_restore)
.text
/* Function to call rom code to save secure ram context */
.align 3
ENTRY(save_secure_ram_context)
stmfd sp!, {r4 - r11, lr} @ save registers on stack
adr r3, api_params @ r3 points to parameters
str r0, [r3,#0x4] @ r0 has sdram address
ldr r12, high_mask
and r3, r3, r12
ldr r12, sram_phy_addr_mask
orr r3, r3, r12
mov r0, #25 @ set service ID for PPA
mov r12, r0 @ copy secure service ID in r12
mov r1, #0 @ set task id for ROM code in r1
mov r2, #4 @ set some flags in r2, r6
mov r6, #0xff
dsb @ data write barrier
dmb @ data memory barrier
smc #1 @ call SMI monitor (smi #1)
nop
nop
nop
nop
ldmfd sp!, {r4 - r11, pc}
.align
sram_phy_addr_mask:
.word SRAM_BASE_P
high_mask:
.word 0xffff
api_params:
.word 0x4, 0x0, 0x0, 0x1, 0x1
ENDPROC(save_secure_ram_context)
ENTRY(save_secure_ram_context_sz)
.word . - save_secure_ram_context
/*
* ======================
* == Idle entry point ==
* ======================
*/
/*
* Forces OMAP into idle state
*
* omap34xx_cpu_suspend() - This bit of code saves the CPU context if needed
* and executes the WFI instruction. Calling WFI effectively changes the
* power domains states to the desired target power states.
*
*
* Notes:
* - only the minimum set of functions gets copied to internal SRAM at boot
* and after wake-up from OFF mode, cf. omap_push_sram_idle. The function
* pointers in SDRAM or SRAM are called depending on the desired low power
* target state.
* - when the OMAP wakes up it continues at different execution points
* depending on the low power mode (non-OFF vs OFF modes),
* cf. 'Resume path for xxx mode' comments.
*/
.align 3
ENTRY(omap34xx_cpu_suspend)
stmfd sp!, {r4 - r11, lr} @ save registers on stack
/*
* r0 contains information about saving context:
* 0 - No context lost
* 1 - Only L1 and logic lost
* 2 - Only L2 lost (Even L1 is retained we clean it along with L2)
* 3 - Both L1 and L2 lost and logic lost
*/
/*
* For OFF mode: save context and jump to WFI in SDRAM (omap3_do_wfi)
* For non-OFF modes: jump to the WFI code in SRAM (omap3_do_wfi_sram)
*/
ldr r4, omap3_do_wfi_sram_addr
ldr r5, [r4]
cmp r0, #0x0 @ If no context save required,
bxeq r5 @ jump to the WFI code in SRAM
/* Otherwise fall through to the save context code */
save_context_wfi:
/*
* jump out to kernel flush routine
* - reuse that code is better
* - it executes in a cached space so is faster than refetch per-block
* - should be faster and will change with kernel
* - 'might' have to copy address, load and jump to it
* Flush all data from the L1 data cache before disabling
* SCTLR.C bit.
*/
ldr r1, kernel_flush
mov lr, pc
bx r1
/*
* 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
/*
* Invalidate L1 data cache. Even though only invalidate is
* necessary exported flush API is used here. Doing clean
* on already clean cache would be almost NOP.
*/
ldr r1, kernel_flush
blx r1
/*
* 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
b omap3_do_wfi
/*
* Local variables
*/
omap3_do_wfi_sram_addr:
.word omap3_do_wfi_sram
kernel_flush:
.word v7_flush_dcache_all
/* ===================================
* == WFI instruction => Enter idle ==
* ===================================
*/
/*
* Do WFI instruction
* Includes the resume path for non-OFF modes
*
* This code gets copied to internal SRAM and is accessible
* from both SDRAM and SRAM:
* - executed from SRAM for non-off modes (omap3_do_wfi_sram),
* - executed from SDRAM for OFF mode (omap3_do_wfi).
*/
.align 3
ENTRY(omap3_do_wfi)
ldr r4, sdrc_power @ read the SDRC_POWER register
ldr r5, [r4] @ read the contents of SDRC_POWER
orr r5, r5, #0x40 @ enable self refresh on idle req
str r5, [r4] @ write back to SDRC_POWER register
/* Data memory barrier and Data sync barrier */
dsb
dmb
/*
* ===================================
* == WFI instruction => Enter idle ==
* ===================================
*/
wfi @ wait for interrupt
/*
* ===================================
* == Resume path for non-OFF modes ==
* ===================================
*/
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
/*
* 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
bne exit_nonoff_modes @ 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
b exit_nonoff_modes @ 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
exit_nonoff_modes:
/* Re-enable C-bit if needed */
mrc p15, 0, r0, c1, c0, 0
tst r0, #(1 << 2) @ Check C bit enabled?
orreq r0, r0, #(1 << 2) @ Enable the C bit if cleared
mcreq p15, 0, r0, c1, c0, 0
isb
/*
* ===================================
* == Exit point from non-OFF modes ==
* ===================================
*/
ldmfd sp!, {r4 - r11, pc} @ restore regs and return
/*
* Local variables
*/
sdrc_power:
.word SDRC_POWER_V
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
/*
* 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
ENTRY(omap3_do_wfi_sz)
.word . - omap3_do_wfi
/*
* ==============================
* == Resume path for OFF mode ==
* ==============================
*/
/*
* The restore_* functions are called by the ROM code
* when back from WFI in OFF mode.
* Cf. the get_*restore_pointer functions.
*
* restore_es3: applies to 34xx >= ES3.0
* restore_3630: applies to 36xx
* restore: common code for 3xxx
*
* Note: when back from CORE and MPU OFF mode we are running
* from SDRAM, without MMU, without the caches and prediction.
* Also the SRAM content has been cleared.
*/
ENTRY(omap3_restore_es3)
ldr r5, pm_prepwstst_core_p
ldr r4, [r5]
and r4, r4, #0x3
cmp r4, #0x0 @ Check if previous power state of CORE is OFF
bne omap3_restore @ Fall through to OMAP3 common code
adr r0, es3_sdrc_fix
ldr r1, sram_base
ldr r2, es3_sdrc_fix_sz
mov r2, r2, ror #2
copy_to_sram:
ldmia r0!, {r3} @ val = *src
stmia r1!, {r3} @ *dst = val
subs r2, r2, #0x1 @ num_words--
bne copy_to_sram
ldr r1, sram_base
blx r1
b omap3_restore @ Fall through to OMAP3 common code
ENDPROC(omap3_restore_es3)
ENTRY(omap3_restore_3630)
ldr r1, pm_prepwstst_core_p
ldr r2, [r1]
and r2, r2, #0x3
cmp r2, #0x0 @ Check if previous power state of CORE is OFF
bne omap3_restore @ Fall through to OMAP3 common code
/* Disable RTA before giving control */
ldr r1, control_mem_rta
mov r2, #OMAP36XX_RTA_DISABLE
str r2, [r1]
ENDPROC(omap3_restore_3630)
/* Fall through to common code for the remaining logic */
ENTRY(omap3_restore)
/*
* Read the pwstctrl register to check the reason for mpu reset.
* This tells us what was lost.
*/
ldr r1, pm_pwstctrl_mpu
ldr r2, [r1]
and r2, r2, #0x3
cmp r2, #0x0 @ Check if target power state was OFF or RET
bne logic_l1_restore
ldr r0, l2dis_3630
cmp r0, #0x1 @ should we disable L2 on 3630?
bne skipl2dis
mrc p15, 0, r0, c1, c0, 1
bic r0, r0, #2 @ disable L2 cache
mcr p15, 0, r0, c1, c0, 1
skipl2dis:
ldr r0, control_stat
ldr r1, [r0]
and r1, #0x700
cmp r1, #0x300
beq l2_inv_gp
mov r0, #40 @ set service ID for PPA
mov r12, r0 @ copy secure Service ID in r12
mov r1, #0 @ set task id for ROM code in r1
mov r2, #4 @ set some flags in r2, r6
mov r6, #0xff
adr r3, l2_inv_api_params @ r3 points to dummy parameters
dsb @ data write barrier
dmb @ data memory barrier
smc #1 @ call SMI monitor (smi #1)
/* Write to Aux control register to set some bits */
mov r0, #42 @ set service ID for PPA
mov r12, r0 @ copy secure Service ID in r12
mov r1, #0 @ set task id for ROM code in r1
mov r2, #4 @ set some flags in r2, r6
mov r6, #0xff
ldr r4, scratchpad_base
ldr r3, [r4, #0xBC] @ r3 points to parameters
dsb @ data write barrier
dmb @ data memory barrier
smc #1 @ call SMI monitor (smi #1)
#ifdef CONFIG_OMAP3_L2_AUX_SECURE_SAVE_RESTORE
/* Restore L2 aux control register */
@ set service ID for PPA
mov r0, #CONFIG_OMAP3_L2_AUX_SECURE_SERVICE_SET_ID
mov r12, r0 @ copy service ID in r12
mov r1, #0 @ set task ID for ROM code in r1
mov r2, #4 @ set some flags in r2, r6
mov r6, #0xff
ldr r4, scratchpad_base
ldr r3, [r4, #0xBC]
adds r3, r3, #8 @ r3 points to parameters
dsb @ data write barrier
dmb @ data memory barrier
smc #1 @ call SMI monitor (smi #1)
#endif
b logic_l1_restore
.align
l2_inv_api_params:
.word 0x1, 0x00
l2_inv_gp:
/* Execute smi to invalidate L2 cache */
mov r12, #0x1 @ set up to invalidate L2
smc #0 @ Call SMI monitor (smieq)
/* Write to Aux control register to set some bits */
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:
/* Now branch to the common CPU resume function */
b cpu_resume
ENDPROC(omap3_restore)
.ltorg
/*
* Local variables
*/
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
control_stat:
.word CONTROL_STAT
control_mem_rta:
.word CONTROL_MEM_RTA_CTRL
l2dis_3630:
.word 0
/*
* Internal functions
*/
/*
* This function implements the erratum ID i443 WA, applies to 34xx >= ES3.0
* Copied to and run from SRAM in order to reconfigure the SDRC parameters.
*/
.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
/*
* Local variables
*/
.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
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