sleep.S
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:5k
- /*
- * SA11x0 Assembler Sleep/WakeUp Management Routines
- *
- * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License.
- *
- * History:
- *
- * 2001-02-06: Cliff Brake Initial code
- *
- * 2001-08-29: Nicolas Pitre Simplified.
- */
- #include <linux/linkage.h>
- #include <asm/assembler.h>
- #include <asm/hardware.h>
- #include "sleep.h"
- /*
- * sa1100_cpu_suspend()
- *
- * Causes sa11x0 to enter sleep state
- *
- */
- .text
- ENTRY(sleep_save) .word 0 @ virtual address of parameter array
- ENTRY(sleep_save_p) .word 0 @ physical address of parameter array
- ENTRY(sa1100_cpu_suspend)
- @ save registers on stack
- stmfd sp!, {r4 - r12, lr}
- @ load virtual address for sleep_save array
- ldr r4, sleep_save
- @ save stack pointer
- str sp, [r4, #(SLEEP_SAVE_SP*4)]
- @ save coprocessor registers
- mrc p15, 0, r1, c1, c0, 0
- str r1, [r4, #(SLEEP_SAVE_CP15_R1*4)]
- mrc p15, 0, r1, c2, c0, 0
- str r1, [r4, #(SLEEP_SAVE_CP15_R2*4)]
- mrc p15, 0, r1, c3, c0, 0
- str r1, [r4, #(SLEEP_SAVE_CP15_R3*4)]
- mrc p15, 0, r1, c5, c0, 0
- str r1, [r4, #(SLEEP_SAVE_CP15_R5*4)]
- mrc p15, 0, r1, c6, c0, 0
- str r1, [r4, #(SLEEP_SAVE_CP15_R6*4)]
- mrc p15, 0, r1, c13, c0, 0
- str r1, [r4, #(SLEEP_SAVE_CP15_R13*4)]
- @ clean data cache and invalidate WB
- bl cpu_sa1100_cache_clean_invalidate_all
- @ disable clock switching
- mcr p15, 0, r1, c15, c2, 2
- @ Adjust memory timing before lowering CPU clock
- @ Clock speed adjustment without changing memory timing makes
- @ CPU hang in some cases
- ldr r0, =MDREFR
- ldr r1, [r0]
- orr r1, r1, #MDREFR_K1DB2
- str r1, [r0]
- @ delay 90us and set CPU PLL to lowest speed
- @ fixes resume problem on high speed SA1110
- mov r0, #90
- bl SYMBOL_NAME(udelay)
- ldr r0, =PPCR
- mov r1, #0
- str r1, [r0]
- mov r0, #90
- bl SYMBOL_NAME(udelay)
- /* setup up register contents for jump to page containing SA1110 SDRAM controller bug fix suspend code
- *
- * r0 points to MSC0 register
- * r1 points to MSC1 register
- * r2 points to MSC2 register
- * r3 is MSC0 value
- * r4 is MSC1 value
- * r5 is MSC2 value
- * r6 points to MDREFR register
- * r7 is first MDREFR value
- * r8 is second MDREFR value
- * r9 is pointer to MDCNFG register
- * r10 is MDCNFG value
- * r11 is third MDREFR value
- * r12 is pointer to PMCR register
- * r13 is PMCR value (1)
- *
- */
- ldr r0, =MSC0
- ldr r1, =MSC1
- ldr r2, =MSC2
- ldr r3, [r0]
- bic r3, r3, #FMsk(MSC_RT)
- bic r3, r3, #FMsk(MSC_RT)<<16
- ldr r4, [r1]
- bic r4, r4, #FMsk(MSC_RT)
- bic r4, r4, #FMsk(MSC_RT)<<16
- ldr r5, [r2]
- bic r5, r5, #FMsk(MSC_RT)
- bic r5, r5, #FMsk(MSC_RT)<<16
- ldr r6, =MDREFR
- ldr r7, [r6]
- bic r7, r7, #0x0000FF00
- bic r7, r7, #0x000000F0
- orr r8, r7, #MDREFR_SLFRSH
- ldr r9, =MDCNFG
- ldr r10, [r9]
- bic r10, r10, #(MDCNFG_DE0+MDCNFG_DE1)
- bic r10, r10, #(MDCNFG_DE2+MDCNFG_DE3)
- bic r11, r8, #MDREFR_SLFRSH
- bic r11, r11, #MDREFR_E1PIN
- ldr r12, =PMCR
- mov r13, #PMCR_SF
- b sa1110_sdram_controller_fix
- .align 5
- sa1110_sdram_controller_fix:
- @ Step 1 clear RT field of all MSCx registers
- str r3, [r0]
- str r4, [r1]
- str r5, [r2]
- @ Step 2 clear DRI field in MDREFR
- str r7, [r6]
- @ Step 3 set SLFRSH bit in MDREFR
- str r8, [r6]
- @ Step 4 clear DE bis in MDCNFG
- str r10, [r9]
- @ Step 5 clear DRAM refresh control register
- str r11, [r6]
- @ Wow, now the hardware suspend request pins can be used, that makes them functional for
- @ about 7 ns out of the entire time that the CPU is running!
- @ Step 6 set force sleep bit in PMCR
- str r13, [r12]
- 20: b 20b @ loop waiting for sleep
- /*
- * cpu_sa1100_resume()
- *
- * entry point from bootloader into kernel during resume
- *
- */
- .align 5
- ENTRY(sa1100_cpu_resume)
- @ set SVC, irqs off
- mov r0, #I_BIT | MODE_SVC
- msr cpsr_c, r0
- @ load physical address of sleep_save
- ldr r4, sleep_save_p
- @ restore cp15_r3, domain id
- ldr r1, [r4, #(SLEEP_SAVE_CP15_R3*4)]
- mcr p15, 0, r1, c3, c0 ,0
- @ restore cp15_r2, translation table base address
- ldr r1, [r4, #(SLEEP_SAVE_CP15_R2*4)]
- mcr p15, 0, r1, c2, c0 ,0
- mov r1, #0
- mcr p15, 0, r1, c8, c7, 0 @ flush I+D TLBs
- mcr p15, 0, r1, c7, c7, 0 @ flush I&D cache
- @ get saved cp15 r1 (control register)
- ldr r1, [r4, #(SLEEP_SAVE_CP15_R1*4)]
- @ get address to jump to after turning on MMU
- ldr r2, =resume_after_mmu
- cmp r2, #0
- b resume_turn_on_mmu
- .align 5
- resume_turn_on_mmu:
- @ turn on mmu
- mcr p15, 0, r1, c1, c0 ,0
- @ jump to resume_after_mmu
- mov pc, r2
- nop
- nop
- .align 5
- resume_after_mmu:
- @ load virtual address for sleep_save array
- ldr r4, sleep_save
- @ restore the rest of CPU state
- ldr r1, [r4, #(SLEEP_SAVE_CP15_R13*4)]
- mcr p15, 0, r1, c13, c0, 0
- ldr r1, [r4, #(SLEEP_SAVE_CP15_R5*4)]
- mcr p15, 0, r1, c5, c0 ,0
- ldr r1, [r4, #(SLEEP_SAVE_CP15_R6*4)]
- mcr p15, 0, r1, c6, c0 ,0
- @ restore stack pointer
- ldr sp, [r4, #(SLEEP_SAVE_SP*4)]
- @ return to caller
- ldmfd sp!, {r4 - r12, pc}