216 lines
4.8 KiB
ArmAsm
216 lines
4.8 KiB
ArmAsm
/*
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* SA11x0 Assembler Sleep/WakeUp Management Routines
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*
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.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.
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*
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* History:
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*
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* 2001-02-06: Cliff Brake Initial code
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*
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* 2001-08-29: Nicolas Pitre Simplified.
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*
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* 2002-05-27: Nicolas Pitre Revisited, more cleanup and simplification.
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* Storage is on the stack now.
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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 <asm/hardware.h>
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.text
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/*
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* sa1100_cpu_suspend()
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*
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* Causes sa11x0 to enter sleep state
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*
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*/
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ENTRY(sa1100_cpu_suspend)
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stmfd sp!, {r4 - r12, lr} @ save registers on stack
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@ get coprocessor registers
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mrc p15, 0, r4, c3, c0, 0 @ domain ID
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mrc p15, 0, r5, c2, c0, 0 @ translation table base addr
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mrc p15, 0, r6, c13, c0, 0 @ PID
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mrc p15, 0, r7, c1, c0, 0 @ control reg
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@ store them plus current virtual stack ptr on stack
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mov r8, sp
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stmfd sp!, {r4 - r8}
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@ preserve phys address of stack
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mov r0, sp
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bl sleep_phys_sp
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ldr r1, =sleep_save_sp
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str r0, [r1]
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@ clean data cache and invalidate WB
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bl v4wb_flush_kern_cache_all
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@ disable clock switching
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mcr p15, 0, r1, c15, c2, 2
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@ Adjust memory timing before lowering CPU clock
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@ Clock speed adjustment without changing memory timing makes
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@ CPU hang in some cases
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ldr r0, =MDREFR
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ldr r1, [r0]
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orr r1, r1, #MDREFR_K1DB2
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str r1, [r0]
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@ delay 90us and set CPU PLL to lowest speed
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@ fixes resume problem on high speed SA1110
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mov r0, #90
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bl __udelay
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ldr r0, =PPCR
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mov r1, #0
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str r1, [r0]
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mov r0, #90
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bl __udelay
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/*
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* SA1110 SDRAM controller workaround. register values:
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*
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* r0 = &MSC0
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* r1 = &MSC1
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* r2 = &MSC2
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* r3 = MSC0 value
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* r4 = MSC1 value
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* r5 = MSC2 value
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* r6 = &MDREFR
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* r7 = first MDREFR value
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* r8 = second MDREFR value
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* r9 = &MDCNFG
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* r10 = MDCNFG value
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* r11 = third MDREFR value
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* r12 = &PMCR
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* r13 = PMCR value (1)
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*/
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ldr r0, =MSC0
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ldr r1, =MSC1
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ldr r2, =MSC2
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ldr r3, [r0]
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bic r3, r3, #FMsk(MSC_RT)
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bic r3, r3, #FMsk(MSC_RT)<<16
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ldr r4, [r1]
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bic r4, r4, #FMsk(MSC_RT)
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bic r4, r4, #FMsk(MSC_RT)<<16
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ldr r5, [r2]
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bic r5, r5, #FMsk(MSC_RT)
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bic r5, r5, #FMsk(MSC_RT)<<16
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ldr r6, =MDREFR
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ldr r7, [r6]
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bic r7, r7, #0x0000FF00
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bic r7, r7, #0x000000F0
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orr r8, r7, #MDREFR_SLFRSH
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ldr r9, =MDCNFG
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ldr r10, [r9]
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bic r10, r10, #(MDCNFG_DE0+MDCNFG_DE1)
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bic r10, r10, #(MDCNFG_DE2+MDCNFG_DE3)
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bic r11, r8, #MDREFR_SLFRSH
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bic r11, r11, #MDREFR_E1PIN
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ldr r12, =PMCR
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mov r13, #PMCR_SF
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b sa1110_sdram_controller_fix
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.align 5
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sa1110_sdram_controller_fix:
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@ Step 1 clear RT field of all MSCx registers
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str r3, [r0]
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str r4, [r1]
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str r5, [r2]
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@ Step 2 clear DRI field in MDREFR
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str r7, [r6]
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@ Step 3 set SLFRSH bit in MDREFR
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str r8, [r6]
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@ Step 4 clear DE bis in MDCNFG
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str r10, [r9]
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@ Step 5 clear DRAM refresh control register
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str r11, [r6]
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@ Wow, now the hardware suspend request pins can be used, that makes them functional for
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@ about 7 ns out of the entire time that the CPU is running!
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@ Step 6 set force sleep bit in PMCR
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str r13, [r12]
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20: b 20b @ loop waiting for sleep
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/*
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* cpu_sa1100_resume()
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*
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* entry point from bootloader into kernel during resume
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*
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* Note: Yes, part of the following code is located into the .data section.
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* This is to allow sleep_save_sp to be accessed with a relative load
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* while we can't rely on any MMU translation. We could have put
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* sleep_save_sp in the .text section as well, but some setups might
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* insist on it to be truly read-only.
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*/
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.data
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.align 5
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ENTRY(sa1100_cpu_resume)
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mov r0, #PSR_F_BIT | PSR_I_BIT | MODE_SVC
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msr cpsr_c, r0 @ set SVC, irqs off
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ldr r0, sleep_save_sp @ stack phys addr
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ldr r2, =resume_after_mmu @ its absolute virtual address
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ldmfd r0, {r4 - r7, sp} @ CP regs + virt stack ptr
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mov r1, #0
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mcr p15, 0, r1, c8, c7, 0 @ flush I+D TLBs
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mcr p15, 0, r1, c7, c7, 0 @ flush I&D cache
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mcr p15, 0, r1, c9, c0, 0 @ invalidate RB
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mcr p15, 0, r1, c9, c0, 5 @ allow user space to use RB
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mcr p15, 0, r4, c3, c0, 0 @ domain ID
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mcr p15, 0, r5, c2, c0, 0 @ translation table base addr
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mcr p15, 0, r6, c13, c0, 0 @ PID
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b resume_turn_on_mmu @ cache align execution
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.align 5
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resume_turn_on_mmu:
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mcr p15, 0, r7, c1, c0, 0 @ turn on MMU, caches, etc.
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nop
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mov pc, r2 @ jump to virtual addr
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nop
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nop
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nop
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sleep_save_sp:
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.word 0 @ preserve stack phys ptr here
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.text
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resume_after_mmu:
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mcr p15, 0, r1, c15, c1, 2 @ enable clock switching
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ldmfd sp!, {r4 - r12, pc} @ return to caller
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